JP3004222B2 - Transparent laminate and display filter using the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a transparent laminate and a display filter using the same. More specifically, a transparent laminate that excels in shielding electromagnetic waves, which are said to be harmful to health, generated from a plasma display, and which cuts off near-infrared rays, which can lead to erroneous operation of peripheral electronic devices, and has excellent transparency. Body and its use for display of electromagnetic wave shielding, near-infrared cut, high transparency, low reflection, excellent weather resistance and environmental resistance, and also anti-glare and anti-Newton ring Regarding filters.

[0002]

2. Description of the Related Art Optoelectronics-related components and equipment have been remarkably advanced and spread as society has become highly information-oriented. Among them, displays for displaying images have become extremely popular for use in television devices, monitor devices for personal computers, and the like, and have become thinner as their sizes have increased. 2. Description of the Related Art In recent years, plasma displays have attracted attention as being suitable for applications such as large-sized thin televisions and thin monitors, and have already begun to appear on the market. However, a plasma display generates a strong leakage electromagnetic field due to its structural principle. In recent years, the influence of the leakage electromagnetic field on the human body and other devices has been discussed, and it has become necessary to suppress the leakage electromagnetic field generated from the plasma display within a predetermined reference value. As a safety standard of this value, for example, in Japan, VC
CI (Voluntaly Control Council for Interference b)
y data processing equipment electronic office mach
ine), and in the United States, the FCC (Federal
munication commission).

Also, a plasma display emits strong near-infrared light, and may act on electronic devices such as a cordless phone and an infrared remote controller to cause a malfunction. Wavelengths of particular concern include 820 nm, 880 nm, and 980 nm used in infrared remote controllers and transmission optical communication.
Therefore, it is necessary to cut light in a wavelength range of 800 to 1000 nm, which is a near-infrared region, from the plasma display to a practically acceptable level.

As described above, when a plasma display is used, it is necessary to reduce the levels of electromagnetic waves and near-infrared rays emitted from the plasma display into the environment. Attachment of a filter having a near-infrared cut property has been studied. As a matter of course, this filter needs to have excellent transparency to visible light. Further, in some cases, since it is attached to the front surface of the display, it is desired that the reflectance of visible light is small and the anti-glare property and the anti-Newton ring property are excellent.

[0005] With respect to the near-infrared cut property, it has been conventionally known to produce a near-infrared absorption filter using a near-infrared absorbing dye, but this has various problems. For example, as a near-infrared absorbing dye, cyanines are not practical because of poor stability to light. In addition, anthraquinones and naphthoquinones have a large absorption in the visible region, and when a near-infrared absorption filter is manufactured using these, there is a problem because the visible light transmittance of the filter is low.
On the other hand, phthalocyanine dyes have high light fastness, and
Near-infrared light in the 00 nm region is well absorbed, but some wavelengths of 800 nm or more where malfunction is problematic cannot be well absorbed, and naphthalocyanine dyes are relatively expensive. In general, near-infrared absorbing dyes have a problem in that deterioration due to environment such as humidity, heat, and light occurs, and changes in optical characteristics such as near-infrared cut property and color tone of a filter occur with time.

[0006] Since a plasma display emits near-infrared light which is problematic over a wide and near-infrared wavelength region, it is necessary to use a near-infrared absorption filter having a large absorptivity in the near-infrared region over a wide wavelength region. There is. But,
In order to reduce the transmittance of near-infrared rays to a level that does not cause a problem, it is necessary to increase the amount of the dye contained in the filter, and the accompanying reduction in visible light transmittance becomes a problem.

[0007] Since the required performance to be satisfied as a filter for a plasma display includes an electromagnetic wave shielding ability, the increase in the number of members accompanying the increase in the required performance causes a cost problem, a decrease in visible light transmittance caused by bonding members, This leads to problems such as an increase in reflection intensity due to the bonding interface.

When used as a filter for a plasma display, the filter is installed on the front of the display to cut off near infrared rays and electromagnetic waves emitted from the plasma display. Will do. In general, the higher the visible light transmittance of the display filter, the better, at least 50%.
Or more, preferably 60% or more, more preferably 70%
It is necessary.

In order to shield a leakage electromagnetic field (electromagnetic wave), it is necessary to cover the display surface with a highly conductive object. For shielding electromagnetic waves, generally, a grounded metal mesh or a mesh of a synthetic resin or metal fiber coated with metal is used.However, in these methods, a portion that does not transmit light emitted from a display is used. This causes problems such as occurrence of moire fringes, high cost due to poor yield, and the like. Therefore, use of a transparent conductive film typified by ITO (Indium Tin Oxide) for the electromagnetic wave shielding layer has been studied. The conductivity normally required for such a transparent conductive film is a sheet resistance of 10 ⁵ Ω / □ or less, preferably 10 ³ Ω / □ or less.

As the transparent conductive film, gold, silver, copper, platinum,
Metal thin film such as palladium; indium oxide, second oxide
There are oxide semiconductor thin films such as tin and zinc oxide; multilayer thin films in which metal thin films and high-refractive-index transparent thin films are alternately stacked. Among them, a transparent conductive film made of a metal thin film can obtain high conductivity, but cannot have a high visible light transmittance due to reflection and absorption of metal over a wide wavelength range. Also,
A device using an oxide semiconductor thin film is superior in transparency to a device using a metal thin film, but is inferior in conductivity and poor in near-infrared reflectivity. Electromagnetic waves generated from a plasma display are extremely intense, and no electromagnetic wave shield using ITO as a transparent conductive layer to shield electromagnetic waves emitted from the plasma display has been obtained. In addition, a highly transparent electromagnetic wave shielding material that has the electromagnetic wave shielding ability of a plasma display and does not impair the transparency of the display,
Further, an electromagnetic wave shielding material having a near-infrared ray cutting ability has not yet been obtained.

On the other hand, a multilayer thin film formed by laminating a metal thin film and a high-refractive-index transparent thin film is different from the conductive and optical characteristics of a metal such as silver in that the high-refractive-index transparent thin film depends on the metal in a certain wavelength region. Due to the prevention of reflection, it has favorable characteristics in all of conductivity, near-infrared cut ability, and visible light transmittance.

A laminate using a multilayer thin film formed by laminating a metal thin film and a high refractive index transparent thin film is disclosed in Japanese Patent Publication No. 8-32436. There is no sufficient performance, and its use as a display filter is not described.

When a thin film is used for the transparent conductive layer,
Generally, there is a problem that the thin film forming surface has poor scratch resistance. Further, when the transparent conductive layer is a metal thin film or a multilayer thin film in which a metal thin film is sandwiched between transparent thin films having a high refractive index, there is a problem that the thin film undergoes a chemical change or a physical change due to gas in a use environment. In particular, when silver is used for the metal thin film, silver aggregates under high temperature and high humidity, causing a whitening phenomenon, and the visibility of the display filter is reduced. Therefore, when a thin film is used as a transparent conductive layer, especially when a multilayer thin film in which a metal thin film and a high refractive index transparent thin film are alternately laminated is used, the thin film has poor scratch resistance and environmental stability. The intended transparent protective layer may be required.

Further, since the display filter is installed on the entire surface of the display, it is required to have high transparency and low reflectivity. Further, in some cases, an anti-Newton ring layer is required. For this reason, when the antireflection layer is provided directly or via a transparent adhesive or adhesive on the thin film forming surface, or when the anti-Newton ring layer is also directly or via a transparent adhesive or adhesive on the thin film forming surface. May be provided above.

However, when a transparent protective layer, an antireflection layer, an anti-Newton ring layer, and a transparent adhesive / adhesive layer are formed on the transparent conductive layer in the transparent laminate,
Changes in the optical properties of the transparent laminate, in particular, an increase in visible light reflection intensity and a decrease in transparency associated therewith have occurred, and as a result, the increase in visible light reflection intensity of the display filter using such a transparent laminate has As a result, transparency is reduced.

[0016]

SUMMARY OF THE INVENTION In view of the above prior art, an object of the present invention is to provide high transparency, and furthermore, an electromagnetic wave shielding property for shielding electromagnetic waves generated from a plasma display, which is said to be harmful to health. And, a transparent laminate excellent in infrared cut properties that blocks near infrared rays that may cause erroneous operation of peripheral electronic devices, and electromagnetic wave shielding properties, near infrared cut properties, high transparency, low reflection, weather resistance using it.
An object of the present invention is to provide a display filter having excellent environmental resistance and having both antiglare property and anti-Newton ring property.

[0017]

The inventors of the present invention have conducted intensive studies to solve the above-mentioned problems. As a result, the present inventors have found that a very strong electromagnetic wave generated in a plasma display in the 20 to 100 MHz band is particularly problematic. And furthermore,
In order to obtain a display filter capable of suppressing the near-infrared light emitted from the plasma display to such an extent that a peripheral device does not malfunction, a high-refractive-index transparent thin film layer is formed on one main surface of the transparent substrate (A). (B),
A combination of (B) / (C) with a metal thin film layer (C) made of silver or a silver alloy is repeatedly laminated three or more times as a repeating unit, and a single layer of a high refractive index transparent thin film (B) is further formed thereon. Are laminated, and have a sheet resistance of 3Ω / □ or less, a visible light transmittance of 50% or more, and a light transmittance of 20% or less in a region having a wavelength longer than 820 nm of 20% or less. The inventors have completed the present invention.

That is, the present invention provides (1) a high refractive index transparent thin film layer (B) on one main surface of a transparent substrate (A).
And a metal thin film layer (C) made of silver or an alloy containing silver, and a combination of a high refractive index transparent thin film layer (B) and a metal thin film layer (C) (B) / (C) as a repeating unit. A high refractive index transparent thin film layer (B) is further laminated thereon, and a conductive surface is formed by a laminated structure of a metal thin film layer and a high refractive index transparent thin film layer. A transparent laminate having a sheet resistance of 3 Ω / □ or less on the conductive surface, a visible light transmittance of 50% or more, and a light transmittance in a wavelength region longer than 820 nm of 20% or less; (2) The transparent laminate according to (1), wherein the number of repetitions is three, and the second metal thin film layer counted from the transparent substrate is thicker than the first and third metal thin film layers. (3) Among the high refractive index transparent thin film layers, Even when a transparent pressure-sensitive adhesive layer or a transparent adhesive layer is laminated on the high-refractive-index transparent thin film layer that is laminated and separated, the increase in visible light reflectance is 2% or less ( (1) The transparent laminate according to any one of (1) to (3), wherein the transparent substrate (A) is a transparent polymer molded product. (5) The transparent laminate according to any one of (1) to (4), wherein the high refractive index transparent thin film layer (B) is mainly composed of indium oxide.
The transparent laminate according to any one of (1) to (5), wherein the transparent substrate (A) contains a dye.
(7) In display filters, (1) to
(8) A display filter comprising: the transparent laminate according to any one of (6) and an electrode containing a metal formed on a conductive surface of the transparent laminate. (7) The display filter according to (7), wherein the filter is formed continuously on the surface and at the periphery of the conductive surface. And a transparent protective layer (D) formed on the conductive surface of the transparent laminated body. (10) The transparent protective layer has a moisture permeability of: 10g / m
And characterized in that ² · day or less (9) display filter according, wherein the visible light reflectivity of 2% or less in the plane which is formed (11) transparent protective layer (9) Or (10) the display filter according to (10), (12) a surface of the transparent protective layer,
(10) The display filter according to (9) or (10), wherein minute unevenness having a size of 10 μm is formed. (13) The display filter according to any one of (1) to (6). The transparent laminate of the description,
A display filter, comprising: a transparent molded body (E), wherein the main surface of the transparent laminate and one main surface of the transparent molded body are bonded to each other; (14) The other side of the transparent molded body The display filter according to (13), wherein both the antireflection layer, the antiglare layer and the anti-Newton ring layer are formed on the main surface, and both the display filter according to (15) and (13). A display filter, wherein an anti-Newton ring layer is formed on the main surface;
6) In display filters, (1)-
(6) selected from the group consisting of the transparent laminate according to any one of the above, a metal-containing electrode, a transparent protective layer (D), an antireflection layer, an anti-Newton ring layer, an antiglare layer, and a transparent molded body (E). (17) a filter for a display, comprising: two or more additional layers.
(18) The display filter according to (16), wherein the additional layer other than the electrode contains a dye.
(1) The transparent laminate according to any one of (1) to (6), a first member including one layer selected from an antireflection layer, an anti-Newton ring layer, and an antiglare layer, and a transparent molded body (E) and a second member composed of at least one selected from a transparent protective layer (D) and an electrode containing a metal, wherein the first member, the transparent molded body, the transparent laminate, (19) In the display filter, the transparent laminate according to any one of (1) to (6) and a transparent molding containing a dye are provided. (F) and 820
(20) a filter for a display, wherein a light transmittance in a wavelength region longer than 10 nm is 10% or less.
A filter used by being attached to a plasma display, having the transparent laminate according to any one of (1) to (6), and having a light transmittance of 10% or less in a wavelength region longer than 820 nm. The present invention relates to a characteristic filter for a plasma display.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION The transparent laminate of the present invention comprises a high refractive index transparent thin film layer (B) on one main surface of a transparent substrate (A).
And a metal thin film layer (C) made of silver or an alloy containing silver, repeatedly laminated three or more times with (B) / (C) as a repeating unit, and further having a high refractive index transparent thin film layer (B ) Are laminated at least, and a conductive surface is formed by a laminated structure of a metal thin film layer and a high refractive index transparent thin film layer. The conductive surface has a surface resistance of 3Ω / □ or less and a visible light transmittance of 50%. That is, the light transmittance in a region having a wavelength longer than 820 nm is 20% or less.

In the present invention, examples of the transparent substrate (A) include molded products of inorganic compounds such as glass and quartz and molded products of transparent organic polymers. Can be used. The polymer molded article may be transparent as long as it is transparent in the visible wavelength range.
Examples include, but are not limited to, polyether sulfone, polystyrene, polyethylene naphthalate, polyarylate, polyether ether ketone, polycarbonate, polypropylene, polyimide, triacetyl cellulose, and the like. These transparent polymer molded products may be in the form of a plate (sheet) or film as long as the main surface is smooth. When a sheet-shaped polymer molded product is used as a substrate, the substrate has excellent dimensional stability and mechanical strength, and thus a transparent laminate having excellent dimensional stability and mechanical strength is obtained. It can be used preferably when required.

Further, since the transparent polymer film has flexibility and the transparent conductive layer can be continuously formed by a roll-to-roll method, when this is used, it is efficient. In addition, since it is possible to produce a transparent laminate in a long and large area, and by attaching a film-like transparent laminate to the glass of a display or the glass support of a filter for a display, it is possible to prevent scattering when glass is broken. Can also be suitably used. In this case, a film having a thickness of usually 10 to 250 μm is used. When the thickness of the film is less than 10 μm, the mechanical strength as a base material is insufficient, and when the thickness is more than 250 μm, the flexibility is insufficient, so that the film is not suitable for being wound on a roll and used.

These substrates are subjected to an etching treatment such as a sputtering treatment, a corona treatment, a flame treatment, an ultraviolet irradiation, an electron beam irradiation or the like, or a undercoating treatment on their surfaces in advance.
The adhesion of the thin film layer formed on the substrate to the substrate may be improved. In order to enhance the adhesion between the transparent substrate and the thin film layer, for example, an arbitrary inorganic layer may be formed between them. Specific materials include nickel, chromium, gold, silver, platinum, zinc, zirconium,
Examples include titanium, tungsten, tin, palladium and the like, or alloys composed of two or more of these materials, but are not particularly limited thereto. The thickness may be a thickness that does not impair the transparency, and is preferably about 0.02 nm to 10 nm. If the thickness of the inorganic layer is too small, a sufficient effect of improving the adhesion cannot be obtained, and if it is too large, the transparency is impaired. When the formed thin film layer is an oxide, a part or all of the metal of the inorganic layer is
Although it is actually a metal oxide, there is no problem in the effect of improving the adhesion. Before forming the thin film layer, dust-proofing such as solvent cleaning or ultrasonic cleaning may be performed as necessary.

In the present invention, such a transparent substrate (A)
On one of the main surfaces, a high refractive index transparent thin film layer (B) and a metal thin film layer (C) are alternately laminated. At this time, each metal thin film layer (C) is made of a high refractive index transparent thin film layer (B) from both sides.
To be sandwiched between.

The electromagnetic wave shielding is performed by the effect of reflection and absorption of the electromagnetic wave in the electromagnetic wave shielding body. To absorb electromagnetic waves, the electromagnetic wave shield needs to be conductive, and the electromagnetic wave shield for a plasma display requires a very low-resistance conductive layer. In order to absorb all the electromagnetic waves generated from the display, the conductive layer needs to have a certain thickness or more. Even if a layer is used, the visible light transmittance will be low. Therefore, it is also important to increase the reflection interface by multi-layer lamination and increase the reflection of electromagnetic waves.

The shielding effect representing the electromagnetic wave shielding ability is as follows.
It indicates how much the electromagnetic wave energy is attenuated, and its magnitude is expressed in decibels (dB). The shielding effect (SE) is a relative evaluation represented by the following expression (1), and it can be said that the larger this numerical value is, the more effective the shielding effect is. Ei indicates the intensity of the incident electric field, and Et indicates the intensity of the transmission electric field, that is, the electric field of the electromagnetic wave transmitted through the shield body. SE = 20 Log (Ei / Et) (1)

The regulation value of the leakage electromagnetic field is indicated by the absolute value of the radiated electric field intensity, and its unit is dB μV / m. The regulation value 3 m away from the object to be measured is 50 dBμV / m for industrial use and 40 dBμV / m for home use. Since the radiated electric field intensity of the plasma display is in the range of 20 to 100 MHz, it exceeds 40 dBμV / m for a diagonal of about 20 inches, and exceeds 50 dBμV / m for a diagonal of about 40 inches. Can not. For home use, practically, the radiated electric field intensity should be 40 dBμV / m or less,
Preferably it is 35 dBμV / m or less, more preferably 30 dBμV / m or less.
It is necessary to be equal to or less than dBμV / m. When the radiated electric field intensity of the plasma display alone is 50 dBμV / m, an electromagnetic wave shield having a shielding effect of 10 dB or more, preferably 15 dB or more, more preferably 20 dB or more is required.

The present inventors have found that in order to achieve a sufficient shielding effect on the above-mentioned plasma display, the transparent laminate to be used as an electromagnetic wave shield has many electromagnetic wave reflection interfaces formed by multilayer lamination and has a surface. Resistance 3Ω / □ or less,
It is preferably 2.5Ω / □ or less, more preferably 2Ω / □.
It has been found that the following low resistance conductivity is required.

Further, since the plasma display emits strong near-infrared rays, the plasma display has a near-infrared range of 800 to 100.
It is necessary to cut light in the wavelength region of 0 nm to such an extent that there is no practical problem. For example, the light transmittance at 820 nm needs to be 10% or less. However, it is desirable that the electromagnetic wave shielding body itself has near-infrared cut properties in view of a demand for reducing the number of members and a limit of near-infrared absorption using a dye.
When a near-infrared absorbing dye is used in combination, the near-infrared ray cut property required for the electromagnetic wave shielding body is lower than the above-mentioned required performance. The amount is increased, and thus the visible light transmittance is reduced. for that reason,
It is desirable that the transparent laminate as the electromagnetic wave shield has a light transmittance of 20% or less in a region having a wavelength longer than 820 nm.

For the near-infrared cut, reflection by free electrons of a metal can be used. However, when the metal thin film layer is made thicker, the visible light transmittance is lowered as described above. Thus, a laminated structure in which a metal thin film layer of a certain thickness is sandwiched between transparent thin film layers having a high refractive index is called a two-layer structure.
By stacking more than one step, the visible light transmittance can be increased and the overall thickness of the metal thin film layer can be increased, and the visible light can be increased by controlling the number of layers and / or the thickness of each layer. The transmittance, visible light reflectance, near infrared transmittance, transmitted color, and reflected color can be changed within a certain range.

If the visible light transmittance is low, the sharpness of the image is reduced when the display is installed. Therefore, the visible light transmittance of the display filter is preferably high, at least 50% or more, preferably 60% or more, and more preferably. Is required to be 70% or more. Therefore, the visible light transmittance of the transparent laminate is at least 50% or more, preferably 60%.
Above, more preferably 70% or more.

When the light emission luminance of the display is high, the neutral density (N
D) A filter may be required in some cases, and it is preferable that the display filter also serves as an ND filter. Therefore, the visible light transmittance of the display filter may be required to be 80% or less.
Further, the transmission color of the filter greatly affects the contrast and the like of the display. For a plasma display filter, green is unsuitable, and neutral gray or neutral blue is required. Further, when the visible light reflectance is high, the reflection of the lighting equipment and the like on the screen becomes large, and the visibility is reduced. Also, as a reflection color, an inconspicuous white, blue, or purple system is preferable. For this reason, it is preferable to use a multilayer lamination that is easily designed and controlled optically. In the present invention, the visible light transmittance and the visible light reflectance are calculated in accordance with JIS (Japanese Industrial Standard) R-3106 from the wavelength dependence of the transmittance and the reflectance.

In the transparent laminate of the present invention, the metal thin film layer (C) is a thin film layer made of silver or an alloy containing silver.
Among them, silver is preferably used because it has excellent conductivity, infrared reflectivity, and visible light transmittance when laminated in multiple layers. However, silver lacks chemical and physical stability and is degraded by environmental pollutants, water vapor, heat, light, etc. An alloy containing at least one kind of a suitable metal can also be suitably used. Here, the silver content of the alloy containing silver is not particularly limited, but is preferably not significantly different from the conductivity and optical characteristics of the silver simple film, and is about 50% by weight or more and less than 100% by weight. Is preferred. In general, the addition of another metal to silver impairs the excellent electrical conductivity and optical characteristics of silver. Therefore, if possible, at least one of the metal thin film layers constituting the multilayer thin film should contain silver. It is desirable to use it without alloying. When all of the metal thin film layers are made of silver that is not an alloy, a transparent laminate having excellent conductivity and optical properties can be obtained, but the environmental resistance is not always sufficient.

As described above, the transparent laminate of the present invention
Sheet resistance 3Ω / □ or less, visible light transmittance 50% or more, 82
Region longer than 0 nm (at least 820 to 1000
(nm region) is 20% or less. Such a transparent laminate is
A combination (B) / (C) of a high refractive index transparent thin film layer (B) and a metal thin film layer (C) made of silver or an alloy containing silver on one main surface of a transparent substrate (A) is a repeating unit. Is obtained by repeatedly laminating three or more times, and further laminating at least one high-refractive-index transparent thin film layer (B) thereon, which has a large number of electromagnetic wave reflection interfaces for shielding electromagnetic waves, and has a low resistance. Excellent in near-infrared cut property and transparency.

In the present invention, the number of repeated laminations is preferably 3 to 6 times. That is, the preferred layer structure of the transparent laminate according to the present invention is as follows: (1) transparent substrate / high refractive index transparent thin film layer / metal thin film layer made of silver or an alloy containing silver (hereinafter, referred to as metal thin film layer) / high refractive index Transparent thin film layer / metal thin film layer /
High refractive index transparent thin film layer / metal thin film layer / high refractive index transparent thin film layer, or (2) transparent substrate / high refractive index transparent thin film layer / metal thin film layer / high refractive index transparent thin film layer / metal thin film layer / high refractive index Transparent thin film layer / metal thin film layer / high refractive index transparent thin film layer / metal thin film layer / high refractive index transparent thin film layer, or (3) transparent substrate /
High refractive index transparent thin film layer / metal thin film layer / high refractive index transparent thin layer / metal thin layer / high refractive index transparent thin layer / metal thin layer / high refractive index transparent thin layer / metal thin layer / high refractive index transparent thin layer / Metal thin film layer / high refractive index transparent thin film layer, or (4) transparent substrate / high refractive index transparent thin film layer / alloy containing silver or silver / high refractive index transparent thin film layer / metal thin film layer / high refractive index transparent thin film Layer / metal thin film layer / high refractive index transparent thin film layer / metal thin film layer / high refractive index transparent thin film layer / metal thin film layer / high refractive index transparent thin film layer / metal thin film layer / high refractive index transparent thin film layer. If the number of repetitions is two or less, it is difficult to simultaneously achieve low transmittance of near infrared rays, low reflectance of visible light, and low resistance. The productivity problem increases, and the visible light transmittance decreases.

The thickness of the metal thin film layer is determined optically and experimentally from the viewpoint of conductivity, optical characteristics, etc., and is not particularly limited as long as the transparent laminate has the required characteristics. Therefore, it is necessary that the aggregation state of metal atoms in the metal thin film layer is not an island-like structure but a continuous state. If the metal thin film layer is too thick, transparency becomes a problem.

When the high refractive index transparent thin film layer adjacent to the metal thin film layer is an oxide, a part of the metal of the metal thin film layer may actually be a metal oxide. However,
Since such a metal oxide region in the metal thin film layer is a very thin region, in optical design and film formation,
There is no problem. Further, the metal thin film layers having n layers (n ≧ 3) are not necessarily the same in thickness. The composition of each metal thin film layer is not necessarily the same. That is, the content of silver in the metal thin film layer and the type of metal used other than silver may be changed according to the lamination order of the metal thin film layers. For the formation of the metal thin film layer, any of conventionally known methods such as sputtering, ion plating, vacuum deposition, and plating can be employed.

In the present invention, the high refractive index transparent thin film layer (B)
And is not particularly limited as long as it has transparency to visible light and has an effect of preventing light reflection in the visible region in the metal thin film layer due to a difference in refractive index from the metal thin film layer. However, a material having a high refractive index of 1.6 or more, preferably 1.7 or more with respect to visible light is used. Specific materials for forming such a transparent thin film include indium, titanium, zirconium, bismuth,
Examples include oxides of tin, zinc, antimony, tantalum, cerium, neodymium, lanthanum, thorium, magnesium, gallium, and the like, a mixture of these oxides, and zinc sulfide. These oxides or sulfides may have a difference in stoichiometric composition with metal and oxygen or sulfur as long as the optical characteristics are not significantly changed. Among them, indium oxide or a mixture of indium oxide and tin oxide (ITO) can be suitably used because it has a high film-forming speed and good adhesion to a metal thin film layer in addition to transparency and refractive index. . In addition, by using an oxide semiconductor thin film having relatively high conductivity such as ITO, the number of electromagnetic wave absorbing layers can be increased and the conductivity of the transparent laminate can be increased.

The thickness of each high-refractive-index transparent thin film layer is determined optically and experimentally based on the optical characteristics of the transparent substrate, the thickness and optical characteristics of the metal thin-film layer, and the refractive index of the high-refractive-index transparent thin film layer. Although not particularly limited, it is preferably 5 nm or more and 200 nm or less, more preferably 10 nm or more and 100 nm or less. Further, the high refractive index transparent thin films having m layers (m ≧ 4) are not limited to the same thickness, and need not be the same transparent thin film material. For forming the high refractive index transparent thin film layer, any of conventionally known methods such as sputtering, ion plating, ion beam assist, vacuum deposition, and wet coating can be employed.

Among the various film forming methods, sputtering is
It is suitable for film thickness control and multilayer lamination, and a metal thin film layer and a high-refractive-index transparent thin film layer can be easily and continuously repeated.
Although specific examples will be described later in Examples, a high-refractive-index transparent thin film layer mainly composed of indium oxide and a metal thin film layer composed of silver or an alloy containing silver are continuously formed by a sputtering method. The formation of the high-refractive-index transparent thin film layer mainly composed of indium oxide is performed by reactive sputtering using a metal target containing indium as a main component or a sintered target containing indium oxide as a main component. In the reactive sputtering method, an inert gas such as argon is used as a sputtering gas and oxygen is used as a reactive gas, and the pressure is usually 0.1 to 20 mTorr, and a direct current (DC) is used.
Alternatively, a radio frequency (RF) magnetron sputtering method or the like can be used. The oxygen gas flow rate is experimentally determined from the obtained film formation rate and the like, and is controlled so as to obtain a thin film having desired transparency. To form a metal thin film layer made of silver or an alloy containing silver, sputtering is performed using silver or an alloy containing silver as a target. An inert gas such as argon is used as a sputtering gas, and the pressure is usually 0.1 to 20 m.
Torr, direct current (DC) or high frequency (RF) magnetron sputtering can be used.

In the present invention, in order to improve the mechanical strength and environmental resistance of the transparent laminate, a transparent hard coat layer may be provided on the non-conductive surface of the transparent substrate (A), An optional protective layer may be provided on the outermost surface to the extent that conductivity and optical characteristics are not impaired. In addition, in order to improve the environmental resistance of the metal thin film layer and the adhesion between the metal thin film layer and the high-refractive-index transparent thin film layer, the conductivity and optical characteristics between the metal thin-film layer and the high-refractive-index transparent thin film layer are improved. Arbitrary inorganic layers may be formed to the extent that they are not damaged. Specific materials include copper,
Examples include nickel, chromium, gold, platinum, zinc, zirconium, titanium, tungsten, tin, palladium, and the like, and alloys composed of two or more of these materials. The thickness is preferably about 0.02 nm to 2 nm. If the thickness is too small, a sufficient effect of improving the adhesion cannot be obtained.
When the high-refractive-index transparent thin film layer is an oxide, part or all of the metal of the inorganic layer is actually a metal oxide, but there is no problem in its effect. Furthermore, by providing a single-layer or multilayer antireflection layer on the main surface of the transparent laminate, a transparent laminate having a higher transmittance can be obtained.

To obtain a transparent laminate having desired optical properties,
An optical design is performed using a vector method using a refractive index and an extinction coefficient of the transparent substrate and the thin film material, a method using an admittance diagram, and the like, and a thin film material of each layer, the number of layers, a film thickness, and the like are determined. In addition, film formation can be performed by controlling the number of layers, film thickness, and the like while observing optical characteristics.

However, a transparent laminate having a multilayer structure in which a metal thin film layer is sandwiched between high-refractive-index transparent thin film layers and formed in one or more layers, forms a thin functional film via a transparent adhesive or adhesive. When bonded on a surface or when a transparent protective layer for the purpose of protecting a thin film is formed directly on the surface on which the thin film is formed, the optical characteristics are generally liable to change, and in particular, the visible light reflection intensity increases and the transmittance decreases accordingly. Will occur. This is done by performing optical design using a vacuum or air having a refractive index of 1 and an extinction coefficient of 0 as a medium for entering or exiting light to the transparent laminate, or performing observation during film formation under similar conditions. Was due to that. When optical design or film formation is performed such that the transparent laminate has a low visible light reflection intensity in vacuum or air, a transparent laminate having a low visible light reflection intensity can be obtained as it is. However, if an adjacent layer such as a transparent adhesive / adhesive or a transparent protective layer is formed on the surface on which the thin film is formed, the optical characteristics of the light incident or emitted medium, especially the refractive index, are different. This is because the interface reflection between the layers changes, and the interference state of light between the thin film layers and between the thin film layers and the medium changes.
In particular, the reflection intensity in the visible light wavelength region changes. In the following description, a multilayer laminated structure including a metal thin film layer and a high refractive index transparent thin film layer is referred to as a transparent multilayer thin film.

Therefore, the optical design may be performed using the refractive index and the extinction coefficient of the adjacent layer to be formed on the thin film forming surface for the light incident or light emitting medium. The adjacent layer is the transparent pressure-sensitive adhesive layer / adhesive layer or the transparent protective layer described above. The thickness of the layer is usually 1 μm or more, and at least 0.5 μm or thinner. Can be regarded as an input or output medium. The refractive index and the extinction coefficient of the material used for the transparent pressure-sensitive adhesive / adhesive or the transparent protective layer can be measured by using an Abbe refractometer, ellipsometry (ellipsometry) or the like. The refractive index and the extinction coefficient of the high-refractive-index transparent thin film layer (B) and the metal thin film layer (C) made of silver or an alloy containing silver can be determined by ellipsometry.

The method using the admittance diagram includes the optical constants (refractive index and extinction coefficient) of the transparent substrate, the optical constants and thicknesses of the thin films formed on the transparent substrate, and the optical constants of the first thin film formed thereon. A method of obtaining the optical admittance of a laminated body according to the constant and the film thickness, and further, the optical constant and the film thickness of the thin film of the second layer formed thereon, which is close to the optical admittance of the light incident or output medium. The more the value is designed, the smaller the interface reflection between the medium and the transparent thin film layer can be made. Therefore, the interface reflection between the medium and the transparent thin film layer can be reduced as the optical admittance of the transparent laminated body and the optical admittance of the adjacent layer are designed to be closer to each other. The optical admittance is numerically equal to the complex refractive index N in a Gaussian unit system. Where N is N = ni
K (n: refractive index, k: extinction coefficient). The complex index of refraction, or optical admittance, is wavelength dependent.

In humans, 500 to 60
Since the wavelength range of 0 nm has high luminosity, by reducing the reflection in this wavelength range, the visible light reflectance in luminosity can be reduced. Therefore, the optical design may be performed with emphasis on the optical admittance in this wavelength region.

When bonding the functional film to the thin film forming surface of the transparent laminate, a transparent adhesive or adhesive is used. Specific materials include an acrylic adhesive, a silicone adhesive, a urethane adhesive, a polyvinyl butyral adhesive (PVB), and an ethylene-vinyl acetate adhesive (EV).
A) and the like, polyvinyl ether, saturated amorphous polyester, melamine resin and the like. The optical characteristics of such a transparent pressure-sensitive adhesive or adhesive have a refractive index of about 1.45 to 1.7 and an extinction coefficient of about 0 at 500 to 600 nm.

In the transparent laminate, the reflection considering the front surface and the back surface, that is, the reflection on both surfaces, occurs on the surface on which the transparent multilayer thin film is formed.
That is, it is preferable that the reflection does not greatly increase even if a transparent adhesive or adhesive is formed on the uppermost high refractive index transparent thin film layer (B). That is, transparent substrate / transparent multilayer thin film /
It is preferable that the reflection on both sides of the transparent pressure-sensitive adhesive / adhesive does not increase more than the reflection on both sides of the transparent laminate, that is, the transparent substrate / transparent multilayer thin film. Preferably, the increase in visible light reflectance is 2% or less, more preferably 1% or less,
Further, it is preferable that the visible light reflectance does not increase and further the visible light reflectance decreases. By obtaining such a transparent laminate, it is possible to obtain a display filter having a low visible light reflectance and a correspondingly high visible light transmittance even when bonding is performed via a transparent adhesive or adhesive. You can do it.

When optical design is performed by a method using optical admittance in consideration of bonding via a transparent adhesive or adhesive, a high refractive index is formed on one main surface of the transparent substrate (A). (B) / (C) in combination with a transparent thin film layer (B) and a metal thin film layer (C) made of silver or an alloy containing silver
Is repeated three times as a repeating unit, and a single high-refractive-index transparent thin film layer (B) is further laminated thereon, and
Second metal thin film layer (C) counted from transparent substrate (A)
Is thicker than the first and third metal thin film layers (C), a transparent laminate having an optical admittance close to the optical admittance of the transparent adhesive / adhesive can be obtained. It was found that a transparent laminate having an increase in visible light reflectance of 2% or less could be obtained even when the material and the adhesive were formed on the thin film forming surface.

The atomic composition of the high-refractive-index transparent thin film layer and the metal thin film layer made of silver or an alloy containing silver formed by the above method is determined by Auger electron spectroscopy (AES), inductively coupled plasma method (ICP), Rutherford. Backscattering method (RB
S) and the like. The layer configuration and film thickness are
It can be measured by observation in the depth direction of Auger electron spectroscopy, cross-section observation using a transmission electron microscope, or the like. The film thickness can be controlled by clarifying the relationship between the film forming conditions and the film forming speed in advance, or by monitoring the film thickness during film formation using a quartz oscillator or the like.

As described above, the transparent laminate of the present invention is obtained. However, as described above, the thin film has poor scratch resistance and environmental resistance, and it is difficult to use the thin film as a filter for display if the thin film is bare. . Therefore, it is preferable to form a transparent protective layer (D) for protecting the thin film. The transparent protective layer (D) in the present invention is transparent in the visible wavelength region and has a function of protecting a thin film. A film having the function, a polymer film having the function, It shows a transparent molded product such as a molecular sheet or glass, or a product on which a film having the function is formed. Even if a film having the function is applied to the substrate on which the transparent protective layer (D) is formed by coating, printing, or formed by various conventionally known film forming methods, a transparent molded article having the film having the function formed thereon,
Alternatively, a transparent molded product having the above function may be attached via an arbitrary transparent adhesive or adhesive. The method for forming these transparent protective layers is not particularly limited. The type and thickness of the transparent molded product are not particularly limited.

The silver constituting the transparent laminate of the present invention lacks chemical and physical stability, is deteriorated by pollutants in the environment, water vapor and the like, and causes aggregation and whitening. On the formation surface, a thin film is composed of contaminants in the usage environment,
It is important to cover with a layer having gas barrier properties so as not to be exposed to water vapor.

It is preferable that the transparent protective layer (D) has a gas barrier property. The required gas barrier property is 10 g / m ² · day or less in moisture permeability, preferably 5 g / m 2
² day or less, more preferably 1 g / m ² day
It is as follows. The transparent protective layer having a gas barrier property in the present invention is a layer that is transparent in the visible wavelength region and has the gas barrier property, and a film having a gas barrier property, or a transparent film on which a film having a gas barrier property is formed. Molded articles, transparent molded articles having gas barrier properties, and the like.

When a transparent protective layer having a gas barrier property is provided on a transparent laminate, a film having a gas barrier property is formed by chemical vapor deposition (CVD), vapor deposition, sputtering, ion plating, coating, printing, etc. It may be formed by a conventionally known various film forming method, or a polymer film having a gas barrier property, a polymer sheet, glass, or a polymer film having a gas barrier property formed thereon, or a polymer sheet having an arbitrary transparent property. The adhesive may be attached via a suitable adhesive / adhesive, or the transparent adhesive / adhesive to which the members are attached may have gas barrier properties. The method for producing the transparent protective layer having gas barrier properties is not particularly limited.

Specific examples of the film having a gas barrier property include silicon oxide, aluminum oxide, tin oxide, indium oxide, yttrium oxide, magnesium oxide, and the like, or a mixture thereof, or a metal obtained by adding a trace amount of another element thereto. In addition to an oxide thin film, polyvinylidene chloride, an acrylic resin, a silicon resin, a melamine resin, a urethane resin, a fluorine resin, and the like, are not particularly limited thereto. The thickness of these films is 10 to 200 nm for a metal oxide thin film and 1 to 1 for a resin.
The thickness is about 00 μm, and may be a single layer or a multilayer, but this is not particularly limited.

As the polymer film having a low water vapor vapor transmission rate, polyethylene, polypropylene, nylon,
Polyvinylidene chloride, vinylidene chloride and vinyl chloride,
Examples thereof include a copolymer of vinylidene chloride and acrylonitrile, and a fluororesin. The moisture permeability is 10 g / m ² · da.
y or less, preferably 5 g / m ² · day or less, more preferably 1 g / m ² · day or less, is not particularly limited. Even when the moisture permeability is relatively high, the moisture permeability decreases by increasing the thickness of the film or adding an appropriate additive. Therefore, polyethylene terephthalate having a thickness sufficient to achieve the above moisture permeability,
Polycarbonate, polystyrene, polyarylate, polyetheretherketone, polyethersulfone and the like may be used.

When the display fister of the present invention is used as a shield against electromagnetic waves, it is widely practiced to provide electrodes on the conductive surface of the transparent laminate to electrically connect the display body and the transparent laminate. For this reason, when forming the transparent protective layer (D), it is important that the electrical contact between the electrode containing metal formed on the conductive surface of the display filter and the display body is not hindered. . That is, the entire surface on which the thin film is formed except for the electrode forming portion may be covered with the transparent protective layer (D).

In order to suppress the deterioration of the metal thin film made of silver or an alloy containing silver, in addition to providing the transparent protective layer as described above, a compound that suppresses the deterioration of silver or the alloy containing silver is dissolved in an arbitrary solvent. Alternatively, it may be applied to the surface or the end face of the thin film forming surface of the transparent laminate of the present invention.

In the present invention, any transparent adhesive or adhesive can be used for bonding the members constituting the transparent laminate or the display filter. At this time, it is important that the adhesive or the adhesive used in the central portion, which is the light transmitting portion from the display, needs to be sufficiently transparent to visible light. The adhesive or glue is
As long as it has practical adhesive strength, it may be a sheet or a liquid. As the pressure-sensitive adhesive, a sheet-shaped pressure-sensitive adhesive can be suitably used. After the sheet-like adhesive material is attached or the adhesive material is applied, the members are laminated by laminating the respective members. The liquid material is an adhesive that is cured by being left at room temperature or heated after application and bonding, and the application method of the adhesive includes a bar coating method, a reverse coating method,
A gravure coating method, a die coating method, a roll coating method, and the like can be used, and the method is selected in consideration of the type, viscosity, and application amount of the adhesive. The thickness of the pressure-sensitive adhesive or the adhesive layer is not particularly limited, but is 0.5 μm to 50 μm,
Preferably it is 1 μm to 30 μm. After bonding using an adhesive or adhesive, air that has entered between the members at the time of bonding can be defoamed or dissolved in the adhesive or adhesive to improve the adhesion between the members. It is preferable to carry out curing under the conditions of pressure, heating and heating. At this time, the pressure condition is generally about several atmospheres to about 20 atmospheres or less, and the heating condition depends on the heat resistance of each member. These are not particularly limited.

In particular, when a film having a certain function is bonded to the thin film forming side of the transparent laminate, the transparent adhesive or adhesive used at that time or the adhesive or adhesive / adhesive is used. The film has a water vapor transmission rate of 10 g / m ^2.
When it has a gas barrier property of not more than day, preferably not more than 5 g / m ² · day, more preferably not more than 1 g / m ² · day, it can be used more suitably.

In general, a device requiring an electromagnetic wave shield is provided with a metal layer inside the case of the device or shields radio waves by using a conductive material for the case. When transparency is required as in a display, a window-shaped optical member having a transparent conductive layer film formed thereon, that is, a display filter is provided. Since the electromagnetic wave induces electric charge after being absorbed in the conductive layer, if the electric charge is not released by grounding, the electromagnetic wave shielding body again acts as an antenna to oscillate the electromagnetic wave and reduce the electromagnetic wave shielding ability. Therefore, the display filter with the electromagnetic wave shielding property is
It is preferable that the conductive portion inside the case of the display device main body be electrically in ohmic contact with the conductive portion. Therefore, in the transparent laminate, a part of the thin film forming surface, which is a current-carrying part, is exposed, and the layers formed on the thin film forming surface including the transparent protective layer described above are formed in portions other than a portion that obtains electrical contact. Must have been.

In order to improve the electrical contact with the transparent laminate, it is preferable to form an electrode containing a metal on the conductive surface of the transparent laminate. The shape of the electrode is not particularly limited. However, it is important that there is no gap for leakage of electromagnetic waves between the display filter and the device that requires an electromagnetic wave shield, and there is no air layer between the electrode containing metal and the transparent conductive layer. This is very important. Therefore, it is preferable to form an electrode containing metal continuously on the conductive surface of the transparent laminate, that is, on the thin film forming surface and on the peripheral edge. That is, an electrode including a metal is formed in a frame shape and without irregularities except for a central portion which is a light transmitting portion from the display. This is because the electrode also plays a role in efficiently discharging the charge induced when the electromagnetic wave is absorbed by the transparent conductive layer into the case of the display body. FIG. 1 shows a specific example of the electrode shape.
The transparent laminate 10 is formed on the transparent molded body 30, and the electrodes 20 are formed on the surface of the transparent laminate 10 in a rectangular frame shape. The electrodes 20 are arranged along the periphery of the transparent laminate 10. Note that the shape of the electrode is not limited to that shown here.

The transparent conductive layer (transparent multilayer) of the transparent laminate
Thin film), electrodes containing metal, in the case of the display body
If the specific resistances of the parts differ greatly,
A difference in impedance occurs, and electromagnetic waves are emitted at that point.
I will. Usually, the conductive layer inside the case is a metal layer,
Anti is 10^-FiveΩcm or less, whereas the transparent conductive layer
The specific resistance is 10^-Five-10^-FourΩ · cm or more. Therefore,
The electrode has a specific resistance of 1 × 10 ^-3Ω · cm or less is preferred
New

The material used for the electrode may be a simple substance such as silver, gold, copper, platinum, nickel, aluminum, chromium, iron, zinc, or the like in terms of conductivity, contact resistance, and adhesion to a conductive surface. A silver paste composed of an alloy composed of more than one kind, a mixture of a synthetic resin and an alloy containing silver or silver, or a mixture of a borosilicate glass and an alloy containing silver or silver can be used. For the formation of the electrode, a conventionally known method such as a printing method or a coating method can be employed for a silver paste or the like such as a plating method, a vacuum evaporation method, or a sputtering method. The thickness of the electrode containing the metal is not particularly limited, but is generally about several μm to several mm.

When a transparent laminate having no electrodes formed thereon is used as a display filter, the portion of the display filter that is in electrical contact with the display body has the transparent conductive layer serving as a current-carrying portion exposed. As described above, the thin film used for the transparent conductive layer has poor abrasion resistance and environmental resistance.If the transparent conductive layer is exposed at the electrical contact portion with the display body, the reliability may be reduced. Connect. For this reason,
When used as a display filter, it is important that the transparent conductive layer is not exposed but has electrodes formed thereon. If the electrode containing metal is thick enough,
The electrode serves as a protective layer for the transparent conductive layer, and can impart abrasion resistance and environmental resistance. As described above, it is desirable that the entire surface on which the transparent conductive layer is formed be covered with the transparent protective layer or the electrode. If there is a part where neither is formed,
Contaminants and water vapor in the environment enter from that portion, causing a whitening phenomenon.

In the case where a polymer film is used as the transparent substrate (A), the transparent laminate obtained as described above is mainly used from the viewpoints of strength, flatness at the time of bonding to a display, an installation method, and the like. Plate-shaped transparent molded body with smooth surface (E)
It is desirable to use them together. For bonding,
When the main surface of the transparent molded body (E) and the main surface of the transparent laminate, which is not the thin film forming surface, are formed via a transparent adhesive or adhesive, electrodes can be easily formed and electrical contact with the display body can be achieved. It is suitable for obtaining.

In the case of a display filter that does not require an electromagnetic wave shielding function, the bonding may be performed on either main surface of the transparent laminate. At this time, when the thin film forming surface is bonded to the main surface of the transparent molded body (E), the transparent adhesive / adhesive and / or the transparent molded body (E) may have a role of a transparent protective layer. .

As the transparent molded body, a plastic plate which is transparent in the visible region is desirable from the viewpoint of mechanical strength, lightness and resistance to cracking. However, a glass plate is also preferably used because of its thermal stability with little deformation due to heat. it can. A specific example of a plastic plate is polymethyl methacrylate (PMMA)
And other acrylic resins, polycarbonate resins,
A transparent ABS resin or the like can be used, but is not limited to these resins. In particular, PMMA can be suitably used because of its high transparency in a wide wavelength region and high mechanical strength. The thickness of the plastic plate is not particularly limited as long as it has sufficient mechanical strength and rigidity for maintaining flatness without sagging, and is not particularly limited, but is usually about 1 mm to 10 mm. When a glass plate is used as the transparent molded body (E), it is desirable to use a semi-tempered glass plate or a tempered glass plate that has been subjected to a chemical strengthening process or an air-cooling strengthening process in order to add mechanical strength.

When the display filter is used with the main surface of the filter and the display surface in close contact with each other,
Since the degree of adhesion between the display surface and the display filter varies depending on the portion, a Newton ring occurs due to a gap generated thereby. Therefore, it is preferable to form an anti-Newton ring layer on the main surface of the display filter that is in close contact with the display surface. When obtaining electrical contact with the display filter for the purpose of shielding electromagnetic waves, the anti-Newton ring layer must not interfere with contact between the electrode containing metal and the display body.

Further, since the display screen becomes difficult to see due to the reflection of a lighting device or the like on the display, an antireflection layer is formed on the surface of the display filter on the human side, that is, on the surface opposite to the display main body side when worn. In this case, it is necessary to suppress the reflection of external light by forming the antiglare layer, or to provide an antiglare layer by forming an antiglare layer. Further, external light reflection of the display filter can be further reduced by forming an antireflection layer on the surface of the display body side when the filter is mounted. In addition, the formation of the antireflection layer can reduce the reflection of the display filter, thereby improving the light transmittance. Anti-glare layer, anti-reflection layer also
When formed on the conductive surface side of the transparent laminate, the electrical contact between the electrode containing metal and the display filter must not be prevented.

Here, the anti-Newton ring layer, the anti-glare layer, and the anti-reflection layer indicate a film having a function or a film having a corresponding function. Even if a film having each function is coated or printed on the substrate to be formed or formed by various conventionally known film forming methods, a transparent molded article having a film having each function formed thereon, or a transparent molded article having each function, It may be attached via any transparent adhesive or adhesive. There is no particular limitation on the method of making these. The type and thickness of the transparent molded product are not particularly limited.

When an anti-Newton ring property and / or anti-glare property or anti-reflection property is required on the transparent conductive layer side of the transparent laminate, the transparent protective layer (D) has an anti-Newton ring property and / or anti-glare property. It is preferable to have anti-reflection property. In this case, it is not necessary to further form a layer having each function on the transparent protective layer (D). Conversely, it is also preferable that the anti-Newton ring layer, the anti-glare layer, and the antireflection layer have a role of a transparent protective layer, that is, have a scratch resistance, a gas barrier property, and the like. These are because the number of constituent members or the number of constituent layers can be reduced, whereby the process, cost, and interfacial reflection between members can be reduced.

The antireflection layer determines the components of the antireflection film and the film thickness of each component by the above-described optical design in consideration of the optical characteristics of the substrate on which the antireflection film is formed. It is desirable that the antireflection layer has a performance in which the visible light reflectance of the surface on which the antireflection film is formed is 2% or less, preferably 1.5% or less, more preferably 0.5% or less. The visible light reflectance of the surface on which the anti-reflection film is formed can be measured by roughening the opposite surface (the surface on which the anti-reflection film is not formed) with sandpaper and removing the reflection on the opposite surface by black paint to prevent reflection. It is measured by measuring reflected light generated only on the surface on which the film is formed.

Specifically, the antireflection layer has a low refractive index of 1.5 or less, preferably 1.4 or less in the visible region.
A single layer of a thin film of a fluorine-based transparent polymer resin, magnesium fluoride, silicon-based resin, or silicon oxide, for example, having an optical thickness of 1/4 wavelength, metal oxides, fluorides, silicon oxides having different refractive indices , Boride, carbide, nitride,
There is a laminate in which two or more thin films of an inorganic compound such as a sulfide or an organic compound such as a silicon-based resin, an acrylic resin, or a fluorine-based resin are laminated in two or more layers. Although a single layer is easy to manufacture, the antireflection property is inferior to that of a multilayer laminate. The multilayer structure has an antireflection function over a wide wavelength range, and the optical design of the substrate is less limited in optical design. These inorganic compound thin films can be employed by any conventionally known methods such as sputtering, ion plating, ion beam assist, vacuum deposition, and wet coating. For the organic compound thin film, a conventionally known method such as wet coating can be adopted.

As described above, the anti-reflection layer formed on the thin film forming surface side of the transparent laminate, that is, the anti-reflection film,
It is preferable that a transparent molded article having an anti-reflection film or a transparent molded article having an anti-reflection film have gas barrier properties, which leads to a reduction in members. Specific examples include a polyethylene terephthalate film in which silicon oxide or a fluorine-based resin is formed as a single layer with an optical thickness of 1/4 wavelength, and a fluorine-based resin film, which have a low water vapor permeability and a low reflection Has preventive ability. Furthermore, scratch resistance can be imparted by forming on a thin film.

The anti-Newton ring layer and the anti-glare layer referred to in the present invention have different applications.
It refers to a layer that is transparent to visible light and has a surface state of minute irregularities of about 1 μm to 10 μm. The anti-Newton ring layer has anti-glare properties. Particularly specifically, an acrylic resin, a silicon resin, a melamine resin, a urethane resin, an alkyd resin, a thermosetting resin or a photocurable resin such as a fluorine resin, silica, melamine,
An ink obtained by dispersing particles of an inorganic compound or an organic compound such as acryl into an ink is applied and cured on a substrate by a bar coating method, a reverse coating method, a gravure coating method, a die coating method, a roll coating method or the like. The average particle size of the particles is 1 to 40 μm. Or acrylic resin,
By applying a thermosetting or light-curing resin such as a silicone resin, a melamine resin, a urethane resin, an alkyd resin, or a fluororesin to a substrate, and pressing and curing a mold having a desired haze or surface state. In addition, an anti-Newton ring layer or an anti-glare layer can be obtained.
Further, the anti-glare layer can be obtained by treating the substrate with a chemical, such as etching a glass plate with hydrofluoric acid or the like. In this case, the haze of the antiglare layer can be adjusted by the treatment time and the etching property of the chemical. In short, it is important to have appropriate irregularities, and it is not necessarily limited to the above method. The haze of the antiglare layer or the anti-Newton ring layer is 0.5% or more and 20% or less, preferably 1% or more and 10% or less. If the haze is too small, the anti-glare ability or anti-Newton ring ability is insufficient, and if the haze is too large, the parallel light transmittance becomes low and the visibility of the display deteriorates.

When the anti-Newton ring property and / or anti-glare property is required on the main surface on the thin film forming side of the transparent laminate, a film having anti-Newton ring and / or anti-glare property, or an anti-Newton ring and / or It is preferable that a transparent molded product having a film having an anti-glare property or a transparent molded product having an anti-Newton ring and / or an anti-glare property has a gas barrier property, because it leads to a reduction in members. As a specific example, particles of the above-mentioned inorganic compound or organic compound are dispersed in the above-mentioned transparent protective layer, and the transparent protective layer imparts anti-Newton ring properties and / or anti-glare properties. When the polyethylene terephthalate film on which the film having anti-Newton ring and / or anti-glare property is formed has a low water vapor vapor transmission rate, the film may be stuck on the thin film forming surface via a transparent adhesive / adhesive. When formed on a thin film, scratch resistance can also be imparted.

When the anti-glare layer of the display filter is relatively far from the display surface, for example, when the display filter is installed separately from the display main body without being in close contact with the display body, blurring may occur due to image diffusion. Therefore, in the case of such an installation method, it is important to select an anti-glare layer which maintains the anti-glare property and has a haze free from blurring of an image even at an appropriate distance from the display.

As described above, the display filter of the present invention comprises a transparent laminate, a metal-containing electrode, a transparent protective layer (D), an antireflection layer, an anti-Newton ring layer,
It is preferable to include two or more additional layers selected from the group consisting of an antiglare layer and a transparent molded article (E).

Further, in order to impart abrasion resistance to the display filter, the surface of the filter which is not on the display side has transparency so as not to impair the characteristics of the display filter including optical characteristics. A hard coat layer may be formed. The antiglare layer may have a hard coat property, and the antireflection layer may have a hard coat property. When the hard coat layer is required on the thin film forming side of the transparent laminate, it is preferable that the transparent protective layer has a hard coat property.

By the way, dust easily adheres to the display surface due to electrostatic charging, and may be discharged when a human body comes into contact and may receive an electric shock. Therefore, it is necessary to perform an antistatic treatment. In some cases. The antistatic ability can be solved by directly forming a conductive layer on the display surface or attaching a member having the conductive layer to the display surface and grounding the conductive layer. Therefore, a conductive layer may be provided on the surface of the display filter on the user side in order to provide the display filter with antistatic capability. In this case, the conductive layer should have a sheet resistance of about 10 ⁸ Ω / □ or less, and should not impair the transparency or resolution of the display screen.

A display filter having an antistatic function may have a transparent conductive layer for antistatic formed as follows. (1) forming a transparent conductive layer on the antiglare layer; and (2) the antireflection layer or the antiglare layer has transparent conductivity. In the method (1),
A transparent conductive layer for preventing static electricity is formed by forming a known transparent conductive film such as the above-described ITO or the like by the method described above or by bonding a polymer film on which the ITO is formed. . In this case, it is important that the antiglare property is not significantly impaired even if a transparent conductive layer for preventing static electricity is formed. When a transparent conductive layer for antistatic is formed on the antiglare layer, the conductivity required by the antistatic ability may be relatively low, so that a thin film that does not impair the antiglare effect is sufficiently effective. . In the method (2), conductive ultrafine particles such as ITO ultrafine particles and tin oxide ultrafine particles are dispersed in an antiglare layer. An optical design including a conductive film may be performed. To give a specific example,
Examples thereof include ITO / silicon-containing compound / ITO / silicon-containing compound, and base / ITO / fluorine-containing compound.

The transparent laminate of the present invention has a near-infrared cut property in addition to the electromagnetic wave shielding ability.
When the light transmittance in a region having a wavelength longer than 20 nm is less than 10%, a near-infrared absorbing dye may be used in combination in order to supplement the near-infrared cut ability of the laminate. As described above, the display filter preferably has a transmission color of neutral gray or neutral blue. Certain commercially available dyes may be used in combination as toning dyes.

As a method for incorporating a dye, (1) the transparent substrate (A) of the transparent laminate may contain a dye,
(2) Any one of a transparent molded article (E), a transparent protective layer (D), an antireflection layer, an anti-glare layer, an anti-new ring layer, and a hard coat layer which are bonded to or formed on the transparent laminate. Or one or more of them contain a pigment; (3) one or more of transparent adhesives and adhesives used for lamination contain a pigment; (4) as a component of a display filter There is a method in which a transparent molded product (F) containing a dye is bonded between any one of the members constituting the display filter via an arbitrary transparent adhesive or adhesive. The display filter containing the dye as described above, when the dye is a near-infrared absorbing dye, supplements the near-infrared cut ability by the thin film, is excellent in near-infrared cut ability, and when the dye is a toning dye, Excellent transmission color, that is, color tone. The term “dye” as used in the present invention refers to a toning dye having an absorption in a visible wavelength region or a near-infrared absorbing dye having an absorption in a near-infrared wavelength region.

The near-infrared absorbing dye used in the present invention is not particularly limited as long as it supplements the near-infrared cutting ability of the laminate and absorbs the near-infrared light emitted by the plasma display to a sufficiently practical level. The concentration is not limited. However, when the compound is a dithiol complex compound represented by the following formula (1) (formula 1) or formula (2) (formula 2), or a mixture of at least one of them, the display filter of the present invention: It can have better near-infrared cut ability. The compounds of the following formulas (1) and (2) are commercially available and can be obtained.

[0085]

Embedded image [Wherein A ^{1 to} A ⁸ each independently represent a hydrogen atom, a halogen atom, a nitro group, a cyano group, a thiocyanate group, a cyanate group, an acyl group, a carbamoyl group, an alkylaminocarbonyl group, an alkoxycarbonyl group, an aryloxycarbonyl Group, substituted or unsubstituted alkyl group, substituted or unsubstituted aryl group, substituted or unsubstituted alkoxy group,
Represents a substituted or unsubstituted aryloxy group, a substituted or unsubstituted alkylthio group, a substituted or unsubstituted arylthio group, a substituted or unsubstituted alkylamino group, or a substituted or unsubstituted arylamino group, and is adjacent to Two substituents may be connected via a linking group, and R ^{1 to} R
⁴ independently represents a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, M represents nickel, platinum, palladium or copper, and X represents a nitrogen atom or a phosphorus atom. ]

[0086]

Embedded image Wherein B ^{1 to} B ⁴ are each independently a hydrogen atom, a cyano group, an acyl group, a carbamoyl group, an alkylaminocarbonyl group, an alkoxycarbonyl group, an aryloxycarbonyl group, a substituted or unsubstituted alkyl group, Represents an unsubstituted aryl group, and two adjacent substituents may be connected via a linking group, and M represents nickel, platinum, palladium or copper. ]

The concentration of a commercially available toning dye having absorption in the visible region is determined by the absorption coefficient of the dye, the color tone of the transparent laminate requiring toning, the visible light transmittance, the color tone required for the display filter, and the visible light transmittance. Etc., and is not particularly limited. Two or more kinds of toning dyes having different absorption wavelengths in the visible region may be used.

The term “containing” as used in the present invention means, in addition to being contained inside a substrate, a state of being applied to the surface of the substrate, a state of being sandwiched between the substrates, and the like. The substrate referred to herein is the transparent substrate (A) of the transparent laminate described above, the transparent molded body (E) to which the transparent laminate is attached, the transparent protective layer (D),
A transparent molded article (F) containing any one of an anti-reflection layer, an anti-glare layer, an anti-Newton ring layer, and a hard coat layer, or a near-infrared absorbing dye sandwiched between display filters. The transparent protective layer (D), the anti-reflection layer, the anti-glare layer, the anti-Newton ring layer, and the hard coat layer, even though the film having each function contains a dye, the transparent molding in which the film having each function contains a dye. It may be formed on the object (F). Examples of the transparent molded product (F) containing a dye include a transparent plastic plate, a transparent polymer film, and glass. As described above, the content of the dye depends on the optical characteristics of the transparent laminate and the optical characteristics required for the display filter.

The method for producing the transparent molded article (F) containing the dye by using the dye is not particularly limited, but, for example, the following three methods can be used. (1) A method of preparing a plastic plate or a polymer film by kneading a resin with a dye and heat-molding the same; (2) Producing a paint containing the dye to prepare a transparent plastic plate, a transparent polymer film, or a transparent glass plate And (3) a method in which a dye is contained in an adhesive to produce a laminated plastic plate, a laminated polymer film, a laminated glass, and the like.

First, in the method of (1), in which a dye is kneaded with a resin and heat-molded, the resin material is preferably as transparent as possible when formed into a plastic plate or a polymer film. Vinyl compounds such as polyethylene, polystyrene, polyacrylic acid, polyacrylic acid ester, polyvinyl acetate, polyacrylonitrile, polyvinyl chloride, polyvinyl fluoride, and addition polymers of those vinyl compounds, polymethacrylic acid, polymethacrylic acid ester , Polyvinylidene chloride,
Copolymerization of vinyl compounds or fluorine compounds such as polyvinylidene fluoride, polyvinylidene cyanide, vinylidene fluoride / trifluoroethylene copolymer, vinylidene fluoride / tetrafluoroethylene copolymer, vinylidene cyanide / vinyl acetate copolymer, etc. Coal, polytrifluoroethylene, polytetrafluoroethylene, a compound containing fluorine such as polyhexafluoropropylene, nylon 6, polyamide such as nylon 66, polyimide, polyurethane,
Polypeptides, polyesters such as polyethylene terephthalate, polycarbonates, polyoxymethylene, polyethylene oxide, polyethers such as polypropylene oxide, epoxy resins, polyvinyl alcohol, polyvinyl butyral and the like, but are not limited to these resins Absent.

Although the processing temperature, film forming conditions, and the like are slightly different depending on the dye and base polymer molded article used, usually, (i) the dye is added to the powder or pellet of the base polymer molded article. , Heated to 150-350 ° C,
After dissolving, a method of forming a resin plate by molding, (ii) a method of forming a film by an extruder, (iii) preparing a raw material by an extruder, 2 to 5 times at 30 to 120 ° C.
A method of stretching the film in a biaxial or biaxial manner to form a film having a thickness of 10 to 200 μm, and the like. At the time of kneading, additives used for ordinary resin molding, such as an ultraviolet absorber and a plasticizer, may be added. The amount of the dye added depends on the absorption coefficient of the dye, the thickness of the polymer molded article to be produced, the desired absorption intensity, the desired visible light transmittance, and the like.
% By weight.

As the method (2) for forming a coating by coating, a method of dissolving a coloring matter in a binder resin and an organic solvent to form a coating, a method of preparing a dithiol complex compound of several μm
Examples of the method include a method of atomizing and dispersing in an acrylic emulsion to obtain a water-based coating, and the like. In the first case, usually
Aliphatic ester resin, acrylic resin, melamine resin, urethane resin, aromatic ester resin, polycarbonate resin, aliphatic polyolefin resin, aromatic polyolefin resin, polyvinyl resin, polyvinyl alcohol resin, modified polyvinyl resin (PVB, EVA) or a copolymer resin thereof is used as a binder resin.

As the solvent, a halogen-based, alcohol-based, ketone-based, ester-based, aliphatic hydrocarbon-based, aromatic hydrocarbon-based, ether-based solvent, or a mixture thereof is used.

The concentration of the dye varies depending on the absorption coefficient of the dye, the thickness of the coating, the desired absorption intensity, the desired visible light transmittance, etc., but is usually 0.1 to 30% based on the weight of the binder resin. is there. Further, the binder resin concentration is usually 1 to 50% with respect to the whole paint.

The acrylic emulsion-based water-based paint is similarly obtained by dispersing a finely pulverized (50-500 nm) dithiol complex compound in an uncolored acrylic emulsion paint. Additives such as an ultraviolet absorber and an antioxidant which are usually used in paints may be added to the paints.

The paint prepared by the above method is coated on a transparent polymer film, a transparent resin, a transparent glass, or the like with a bar coder, a blade coater, a spin coater, a reverse coater, a die coater, a spray, or the like to obtain a dye. Is prepared. A protective layer may be provided to protect the coated surface, or a transparent resin plate, a transparent polymer film, or the like may be attached to the coated surface. A cast film is also included in the method.

In the method of (3) in which a dye is contained in an adhesive to produce a laminated resin plate, a laminated resin film, a laminated glass, and the like, the adhesive may be a general silicone-based, urethane-based, acrylic-based, or the like. Polyvinyl butyral adhesive for resin or laminated glass (PV
B), a known transparent adhesive for laminated glass such as an ethylene-vinyl acetate adhesive (EVA) can be used. A transparent resin plate, a resin plate and a polymer film, a resin plate and glass, a polymer film, a polymer film and glass, and a glass are bonded to each other using an adhesive containing 0.1 to 30% by weight of a dye. To make.

The adhesive containing the above-mentioned dyes includes a transparent laminate, a transparent molded article (E) for bonding the transparent laminate, a transparent protective layer (D), an antireflection layer, an anti-glare layer, an anti-Newton ring layer, and a dye. May be used for laminating each member such as a transparent molded product (F).

Further, the filter for a plasma display needs to cut off near infrared rays having a high intensity in a wavelength region of 800 to 1000 nm. If necessary, the above formula (1) and / or (2) can be used. Two or more of the represented dithiol complex compounds may be combined. Further, one or more other near-infrared absorbing dyes may be added. Further, in order to obtain a display filter having a suitable color tone in addition to the near-infrared ray suppressing ability, one or more toning dyes having absorption in the visible wavelength region may be added.

A transparent film (UV cut film) containing a UV absorber can be attached to increase the light resistance of the dye-containing display filter,
UV absorbers can be included with the dye.

The configuration of the display filter according to the present invention can be changed as required. The transparent laminate and the filter for display of the present invention are excellent in near-infrared suppression ability. hand,
Less deterioration due to environment such as humidity, heat and light. The dithiol complex compound represented by the above-mentioned formula (1) (formula 1) or (2) (formula 2) or a mixture of at least one of them is excellent in environmental resistance. When used in combination, a display filter with little deterioration can be obtained. Therefore, the laminate and display filter of the present invention can be suitably used as a near-infrared cut filter.

The structures of the transparent laminate and the filter for display of the present invention as described above will be described in more detail. A transparent laminate 10 according to a preferred embodiment of the present invention shown in FIG. 2 is one in which a transparent conductive layer 12 is formed on one main surface of a transparent substrate 11 made of a polymer film or the like. The transparent conductive layer 12 is formed by alternately stacking four high-refractive-index transparent thin film layers 13 and three metal thin film layers 14 on the main surface of the transparent substrate 11. The high-refractive-index transparent thin film layer 13 is typically mainly composed of indium oxide. The metal thin film layer 14 is made of silver or an alloy containing silver. In the transparent laminate 10 shown here, three metal thin film layers 14 are provided.
Of these, the central metal thin film layer 14 is
It is formed thicker than that.

The display filter according to the preferred embodiment of the present invention shown in FIG. 3 uses the transparent laminate 10 shown in FIG. 2, and the transparent conductive layer 12 is formed on the main surface of the transparent laminate 10. The main surface that is not formed is bonded to one main surface of the transparent molded body 30. An antireflection film as an antireflection layer 51 is attached to the other main surface of the transparent molded body 30. Transparent conductive layer 12
A transparent protective layer 40 for protecting the transparent conductive layer 12 is attached to a portion of the surface except for the peripheral portion. In addition, on the periphery of the surface of the transparent conductive layer 12,
The electrode 20 is formed so as to cover the side surface of the transparent conductive layer 12. The electrode 20 contains a metal and is for grounding the transparent conductive layer 12. The planar shape of the electrode 20 is as shown in FIG. In a plasma display to which the display filter is attached, if a grounding conductive layer is formed on the peripheral portion of the screen, when the display filter is attached to the plasma display, the display conductive layer and the electrode 20 of the filter are connected to each other. Are electrically in contact with each other, and the transparent conductive layer 12 can be grounded. In addition, by the frame-shaped member, the display filter and the screen portion of the display will be electrically connected without a gap,
Leakage electromagnetic waves can be significantly reduced. In addition,
In order to protect the transparent conductive layer 12, it is important that no gap is formed between the portion where the transparent protective layer 40 covers the transparent conductive layer 12 and the portion where the electrode 20 covers the transparent conductive layer 12.

The application and mounting method of the display filter of the present invention are roughly classified into the following, but are not particularly limited thereto. (1) A display filter having an electromagnetic wave shielding function and a near-infrared cut-off function is attached such that the main surface of the filter is in close contact with the display screen. (2) A filter for display having electromagnetic wave shielding ability and near-infrared cut-off ability is attached with the main surface of the filter separated from the display screen. (3) A display filter having near-infrared cut-off capability is attached in close contact with the display screen. (4) A display filter having near-infrared cut-off capability is attached with the filter main surface separated from the display screen.

Hereinafter, the transparent laminate and the display filter according to the preferred embodiments of the present invention will be described with reference to the drawings according to each of the above mounting methods. In the case of (1), when a filter is mounted on a display in which the transparent protective layer has the function of an anti-Newton ring layer and has a conductive layer for grounding on the display side, usually,
Attach the filter so that the electrodes of the filter face the display. Assuming that the display filter of FIG. 3 is used, in order from the display side, (the electrode 20 including metal
-Transparent protective layer 40) / Transparent laminate 10 / Transparent molded body 30
/ Anti-reflection layer 51. Instead of the antireflection layer, an antiglare layer 52 may be provided as shown in FIG.

On the other hand, when the transparent protective layer 40 does not have a function as an anti-Newton ring layer, an anti-Newton ring layer 41 is further bonded to the transparent protective layer 40 as shown in FIG. In this case, from the display side, (electrode 20 / anti-Newton ring layer 4
1) / Transparent protective layer 40 / Transparent laminate 10 / Transparent molded article 3
0 / anti-reflection layer 51. Of course, an anti-glare layer 52 may be provided instead of the anti-reflection layer 51.

Further, when the ground conductive layer is not formed on the display side, the positional relationship between the transparent molded body 30 and the transparent laminate 10 can be reversed. In this case, if the transparent protective layer has a function as an anti-glare layer or an anti-reflection layer, as shown in FIG. 6, from the display side, the anti-Newton ring layer 53 / the transparent molded body 30 / the transparent laminate 10 / ( It becomes the transparent protective layer 40 and the electrode 20). When the transparent protective layer 40 does not have a function as an anti-glare layer or an anti-reflection layer, as shown in FIG. 7, the anti-Newton ring layer 53 / the transparent molded body 30 /
Transparent laminate 10 / transparent protective layer 40 / (anti-reflection layer 42
The electrodes are stacked in the order of 20). As shown in FIG. 8, an anti-glare layer 43 may be provided instead of the anti-reflection layer 42.

In the case of (2), by not mounting the display and the display filter, it is not necessary to provide an anti-Newton ring layer or to provide the transparent protective layer with a function as an anti-Newton ring layer. Instead, both major surfaces of the display filter must have anti-reflective properties or anti-glare properties.

When the transparent protective layer has a function as an anti-reflection layer or an anti-glare layer, a display filter is formed as shown in FIGS. However, which main surface of the display filter faces the display depends on the position of the grounding conductive layer. When the transparent protective layer does not have a function as an anti-reflection layer or an anti-glare layer, in the display filter shown in FIGS. Can be used. However, which main surface of the display filter faces the display is arbitrary.

In the case of (3), no electrode is required for the display filter. In the case where the transparent protective layer has a function as an anti-Newton ring layer, as shown in FIG. 51. An anti-glare layer 52 may be provided instead of the anti-reflection layer 51. When the transparent protective layer does not have the function of the anti-Newton ring layer, an anti-Newton ring layer 41 is further attached to the transparent protective layer 40 as shown in FIG. In any case, the transparent protective layer 40 is formed so as to cover the entire surface of the transparent laminate 10 including the side surfaces.

In the case of (4), if the transparent protective layer has a function as an anti-reflection layer or an anti-glare layer, it is usually (anti-reflection layer or anti-glare layer) /
The display filter is constituted in the order of the transparent laminate / transparent molded article / (antireflection layer or antiglare layer).

In the case where a near-infrared absorbing dye and / or toning dye is used in the display filter of the present invention, at least one of the above-mentioned constituent elements constituting the filter contains a dye or a dye. Is sandwiched between any of the components. For example, in the case of the above (2), when the transparent protective layer has a function as an anti-reflection layer or an anti-glare layer, (metal electrode / transparent protective layer) /
It is composed of a transparent laminate / transparent molded article / transparent molded article containing a dye (F) / (anti-reflection layer or anti-glare layer). A film having an antireflection property or an antiglare property may be directly formed on the transparent molded product (F) containing a dye, or a film having each function may be bonded.

In general, when the transparent molded article (E) is a transparent resin, the transparent molded article (E) is prepared by laminating a transparent laminate or a polymer film having various functions onto the transparent molded article (E), or by laminating. The display filter may warp when heat is applied by the display or the use environment when the display filter is used. Therefore, it is important to perform bonding so that warpage does not occur. When laminating a polymer film having various functions, it is important to balance not only one surface of the transparent molded body (E) but also the film tension on both surfaces. When lamination is not performed, it is important that the transparent molded body is not warped.

In particular, when the display filter is warped so as to expand toward the user when attached to the display,
The visibility of the image decreases. When the anti-glare layer is formed, the image is blurred.

In the case of the above (3), the anti-Newton ring layer usually has an anti-glare property, and if the anti-glare layer on the user side of the display filter has the anti-Newton ring property. Both surfaces of the filter can be used in close contact with the display screen. That is, it is preferable that anti-Newton ring layers are formed on both surfaces. In this case, after confirming the warping direction of the display filter, the filter may be mounted in a suitable direction in which the filter does not expand to the user side and closely adheres to the display body. FIG. 11 shows an example of such a display filter. In this display filter, the first anti-Newton ring layer 4
1 / Transparent protective layer 40 / Transparent laminate 10 / Transparent molded article 30
/ The second anti-Newton ring layer 53 is laminated in this order.

The display filter of the present invention may be subjected to arbitrary frame printing in order to prevent the mounting jig, the electrode portion, and the like from being seen by a viewer when the filter is mounted on a display. The printing shape, printing surface, printing color, and printing method are not particularly specified. Further, a process such as a hole process for mounting on a display may be performed. Furthermore, by adding a polarizing film, a retardation film, or the like, and adding the performance of a circularly polarizing filter, it is possible to suppress the reflected light from the display side, and the filter becomes more excellent.

The display filter of the present invention has a high visible light transmittance, so that the sharpness of the display is not impaired, and the filter for the display has an excellent electromagnetic wave shielding property for shielding electromagnetic waves which are considered to be harmful to health generated from the display. Efficiently cuts near-infrared light of about 800 to 1000 nm from the display, without adversely affecting the wavelength used by transmission optical communication, etc., and preventing malfunction of the infrared remote controller of peripheral electronic devices. it can. In addition, it has excellent weather resistance and environmental resistance, and has anti-reflection or anti-glare properties and anti-Newton ring properties.

[0118]

Next, the present invention will be described in detail with reference to examples. The present invention is not limited by these. The thickness of the thin film shown in the following Examples and Comparative Examples,
This is a value obtained from the film forming conditions, and is not an actually measured film thickness. Example 1 An ITO thin film (thickness: 40 n) was formed on one main surface of a biaxially stretched polyethylene terephthalate film (thickness: 50 μm) by magnetron DC sputtering.
m), silver thin film (thickness 10 nm), ITO thin film (thickness 80
nm), silver thin film (thickness 15 nm), ITO thin film (thickness 8
0 nm), a silver thin film (thickness: 10 nm), and an ITO thin film (thickness: 40 nm) in this order, whereby the transparent laminate of the present invention having three metal thin film layers and four high refractive index transparent thin film layers Was prepared. The ITO thin film constitutes a high refractive index transparent thin film layer, and the silver thin film constitutes a metal thin film layer. In forming the ITO thin film, an indium oxide / tin oxide sintered body (composition ratio In ₂ O ₃ : SnO ₂ = 90: 10 wt.) Was used as a target.
%), And an argon / oxygen mixed gas (total pressure 266 mPa: oxygen partial pressure 5 mPa) was used as a sputtering gas. Also,
Silver was used as a target for forming a silver thin film, and argon gas (total pressure of 266 mPa) was used as a sputtering gas.

Example 2 In the same manner as in Example 1, a biaxially stretched polyethylene terephthalate film (thickness: 50
μm), an ITO thin film (40 nm thick)
Silver thin film (thickness 12nm), ITO thin film (thickness 80n)
m), silver thin film (thickness 12 nm), ITO thin film (thickness 70
nm), silver thin film (thickness 12 nm), ITO thin film (thickness 4
0 nm) to produce a transparent laminate of the present invention.

Example 3 In the same manner as in Example 1, a biaxially stretched polyethylene terephthalate film (thickness: 50
μm), an ITO thin film (40 nm thick)
Silver thin film (thickness 9nm), ITO thin film (thickness 80nm),
Silver thin film (thickness 12nm), ITO thin film (thickness 80n)
m), silver thin film (thickness 9 nm), ITO thin film (thickness 40 n)
m) to form a transparent laminate of the present invention.

Example 4 In the same manner as in Example 1, a biaxially stretched polyethylene terephthalate film (thickness: 50
μm), an ITO thin film (40 nm thick)
Silver thin film (thickness 11nm), ITO thin film (thickness 80n)
m), silver thin film (thickness 11 nm), ITO thin film (thickness 80
nm), silver thin film (thickness 13 nm), ITO thin film (thickness 8
0 nm), a silver thin film (thickness 13 nm), and an ITO thin film (thickness 40 nm) in this order to produce a transparent laminate of the present invention having four metal thin film layers and five high refractive index transparent thin film layers. did.

Example 5 One principal surface of a biaxially stretched polyethylene terephthalate film (thickness: 50 μm)
By magnetron DC sputtering method, an indium oxide thin film (thickness 40 nm), a silver thin film (thickness 10 nm),
Indium oxide thin film (thickness: 70 nm), silver thin film (thickness: 1)
0 nm), an indium oxide thin film (thickness 70 nm), a silver thin film (thickness 10 nm), an indium oxide thin film (thickness 60 n)
m), a silver thin film (thickness: 6 nm), an indium oxide thin film (thickness: 40 nm), a silver thin film (thickness: 6 nm), and an indium oxide thin film (thickness: 20 nm). The transparent laminate of the present invention having a high refractive index transparent thin film layer was produced. To form an indium oxide thin film as a high refractive index transparent thin film layer, indium was used as a target, and an argon / oxygen mixed gas (total pressure: 266 mPa:
An oxygen partial pressure of 80 mPa) was used. In addition, silver was used as a target and an argon gas (total pressure: 266 mPa) was used as a sputtering gas for forming a silver thin film as a metal thin film layer.

Comparative Example 1 A biaxially stretched polyethylene terephthalate film (thickness: 50) was prepared in the same manner as in Example 1.
μm), an ITO thin film (40 nm thick)
Silver thin film (thickness 9nm), ITO thin film (thickness 70nm),
A silver thin film (thickness: 9 nm) and an ITO thin film (thickness: 40 nm) were laminated in this order to produce a transparent laminate.

Example 6 One principal surface of a biaxially stretched polyethylene terephthalate film (thickness: 50 μm)
By magnetron DC sputtering method, an indium oxide thin film (thickness 40 nm), a silver thin film (thickness 10 nm),
Indium oxide thin film (thickness: 70 nm), silver thin film (thickness: 1)
0 nm), an indium oxide thin film (thickness 70 nm), a silver thin film (thickness 10 nm), an indium oxide thin film (thickness 60 n)
m), silver-gold alloy thin film (thickness 6 nm), indium oxide thin film (thickness 40 nm), silver-gold alloy thin film (thickness 6 n)
m) and an indium oxide thin film (thickness: 20 nm) in this order to prepare a transparent laminate of the present invention having five metal thin film layers and six high refractive index transparent thin film layers. Here, indium oxide forms a high refractive index transparent thin film layer, and the silver thin film and the silver-gold alloy thin film form a metal thin film layer. For forming the indium oxide thin film, indium was used as a target, and a mixed gas of argon and oxygen (total pressure: 266 mPa: oxygen partial pressure: 80 mPa) was used as a sputtering gas. To form a silver thin film, silver was used as a target and argon gas (total pressure of 266 m) was used as a sputtering gas.
Pa) was used. To form a silver-gold alloy thin film, a silver-gold alloy (composition ratio, silver: gold = 85: 15 wt%) is used as a target.
With argon gas (total pressure 266 mPa) as sputtering gas
Was used.

[Example 7] The main surface of the transparent laminate of Example 1 on which the thin film was not formed, and a 2 mm thick PMMA plate (Acrylite (trade name, manufactured by Mitsubishi Rayon Co., Ltd.)) ), 470 mm × 350 mm) and a transparent adhesive. Further, as shown in FIG. 1, a silver paste (MSP-600F, manufactured by Mitsui Toatsu Chemicals, Inc.) is screen-printed on the thin film forming surface, that is, the conductive surface of the transparent laminate, and dried, and a metal having a thickness of 20 μm and a width of 10 mm is dried. (Specific resistance 5 × 10 ⁻⁵ Ω · cm) was formed, and a display filter of the present invention was produced.

Example 8 As shown in FIG. 1, a silver paste (manufactured by Mitsui Toatsu Chemicals, Inc.) was applied to the transparent film (472 mm × 350 mm) thin film forming surface, that is, the conductive surface of the present invention of Example 5. Is screen-printed and dried to a thickness of 20μ.
An electrode containing a metal having a width of 10 mm and a width of 10 mm was formed to prepare a display filter of the present invention.

Example 9 A polyethylene terephthalate pellet 1203 (manufactured by Unitika Ltd.) was added to the following formula (3).
0.1 wt% of the dithiol complex represented by Chemical Formula 3 was mixed and melted at 260 to 280 ° C., and a film having a thickness of 100 μm was produced by an extruder. Thereafter, the film was biaxially stretched to a film having a thickness of 50 μm, and a silicon oxide thin film was formed on one main surface of the film by electron beam evaporation to a thickness of 90 nm to produce an antireflection film. The visible light reflectance on the antireflection film-formed surface of the antireflection film was obtained by roughening the surface on which the antireflection film was not formed with sandpaper, performing black coating, and then obtaining a visible light reflectance by a method described later. As a result, it was 1.4%. The anti-reflection film was found to have a gas barrier property of 1.4 g / m ² · day when measured for moisture permeability according to ASTM-E96. The other main surface of the antireflection (gas barrier) film containing the near-infrared absorbing dye and having gas barrier properties (the transparent protective layer and antireflection layer in the present invention) on which the silicon oxide thin film is not formed; The thin film forming surface of the transparent laminate of the present invention of Example 1 was bonded via an acrylic adhesive (refractive index: 1.64, extinction coefficient: 0 at 500 to 600 nm) to produce a display filter of the present invention.

[0128]

Embedded image

Example 10 The procedure of Example 2 was repeated, except that the transparent laminate of Example 2 was used instead of the transparent laminate of Example 1.
A display filter of the present invention was produced in the same manner as in Example 9. Example 11 A display filter of the present invention was produced in the same manner as in Example 9 except that the transparent laminate of Example 3 was used instead of the transparent laminate of Example 1.

Comparative Example 2 A display filter was produced in the same manner as in Example 9 except that the transparent laminate of Comparative Example 1 was used instead of the transparent laminate of Example 1. Comparative Example 3 A thin film forming surface of the transparent laminate of the present invention of Example 1 and a polycarbonate film (thickness: 100 μm)
Of the acrylic adhesive material (500 in the same manner as in Example 8).
At ６００600 nm, a refractive index of 1.64 and an extinction coefficient of 0) were applied together to produce a display filter.

[Embodiment 12] In the same manner as in Embodiment 5, 2
Axial stretched polyethylene terephthalate film (thickness 50
μm), an indium oxide thin film (thickness: 40 n)
m), silver thin film (thickness 10 nm), indium oxide thin film (thickness 70 nm), silver thin film (thickness 10 nm), indium oxide thin film (thickness 70 nm), silver thin film (thickness 10 n)
m) and an indium oxide thin film (thickness: 40 nm) were laminated in this order to produce a transparent laminate of the present invention.

Polyethylene terephthalate pellets 12
03 (manufactured by Unitika Ltd.) and 0.13 wt% of a dithiol complex represented by the following formula (4)
Melted at ~ 280 ° C, thickness 100μ by extruder
m was prepared. Thereafter, this film was biaxially stretched to obtain a dye film having a thickness of 50 μm.

[0133]

Embedded image

On one main surface of the biaxially stretched polyethylene terephthalate film (thickness: 100 μm), a thermosetting varnish (SF-C-33 manufactured by Dainippon Ink and Chemicals, Inc.) was used.
5) A solution obtained by dissolving 3 g in a mixed solvent of toluene / methyl ketone (10: 1) (100 g) was applied and air-dried.
Thereafter, the composition was cured at 150 ° C. for 20 seconds to form an anti-Newton ring layer having a thickness of 1 μm, thereby producing an anti-Newton ring film. When the haze of the anti-Newton ring layer was measured using a haze meter, it was 2%, and the anti-Newton ring film had antiglare properties.

One main surface of a 2 mm-thick PMMA plate (manufactured by Mitsubishi Rayon Co., Ltd .: Acrylite (trade name)) was bonded to the above-mentioned dye film, and the transparent multilayer of the main surface of the transparent laminate was further laminated. The side on which the thin film is not formed
It was stuck on a dye film stuck to a PMMA plate. Thereafter, an acrylic resin is formed as a transparent protective layer by screen printing to a thickness of 10 μm on the thin film forming surface of the transparent laminate, and the anti-Newton ring film is formed on the transparent protective layer and the other main surface of the PMMA plate. The anti-Newton ring layer was bonded using a transparent adhesive so that the anti-Newton ring layer was on the display side, thereby producing a display filter of the present invention.

[Embodiment 13] In the same manner as in Embodiment 5, 2
Axial stretched polyethylene terephthalate film (thickness 50
μm), an indium oxide thin film (thickness: 40 n)
m), silver thin film (thickness 10 nm), indium oxide thin film (thickness 80 nm), silver thin film (thickness 15 nm), indium oxide thin film (thickness 80 nm), silver thin film (thickness 10 n)
m) and an indium oxide thin film (thickness: 40 nm) in this order to produce a transparent laminate (470 mm × 350 mm) of the present invention.

A surface of the transparent laminate where the thin film is not formed and a PM having a thickness of 2 mm having an antiglare layer on one side.
MA plate (Mitsubishi Rayon Co., Ltd .: Acryfilter MR)
-NG) on the surface where the antiglare layer was not formed. When the haze of the antiglare layer was measured using a haze meter, it was 2%. Further, as shown in FIG. 1, a silver paste (manufactured by Mitsui Toatsu Chemicals, Inc.) was screen-printed on the thin film forming surface, that is, the conductive surface of the transparent laminate,
After drying, an electrode containing a metal having a thickness of 20 μm and a width of 10 mm was formed.

Further, a silicon oxide thin film having a thickness of 90 nm was formed on one main surface of a biaxially stretched polyethylene terephthalate film (thickness: 100 μm) by electron beam evaporation.
An anti-reflection film was produced. The visible light reflectance of the antireflection film on the surface on which the antireflection film was formed was 1.4% when obtained in the same manner as in Example 9. The anti-reflection film had a gas permeability of 0.8 g / m ² · day when measured for moisture permeability in accordance with ASTM-E96. The other main surface of the antireflection (gas barrier) film having a gas barrier property (the transparent protective layer and the antireflection layer in the present invention) on which the silicon oxide thin film is not formed, and the thin film forming surface of the transparent laminate are formed. A portion where the metal-containing electrode was not formed was attached via a transparent adhesive to produce a display filter of the present invention.

Example 14 The main surface of the transparent laminate according to the present invention of Example 1 on which the transparent multilayer thin film was not formed, and a 2 mm-thick PMMA plate (Mitsubishi Rayon Co., Ltd.)
Made: Acrylite (trade name), 470 mm x 350 m
m) were bonded together. Further, in the same manner as in Example 7, an electrode containing metal (specific resistance 5 × 10 ⁻⁵ Ω · cm) was formed.

A magnesium fluoride thin film having a thickness of 95 nm was formed on one main surface of a biaxially stretched polyethylene terephthalate film (thickness: 50 μm) by electron beam evaporation.
Then, a first antireflection film was produced. Visible light reflectance on the antireflection film forming surface of the antireflection film,
When obtained in the same manner as in Example 9, it was 0.8%. First
The antireflection film of (1) was found to have a gas barrier property of 1.9 g / m ² · day when measured for moisture permeability in accordance with ASTM-E96. The other main surface of the first antireflection (gas barrier) film (transparent protective layer and antireflection layer in the present invention) on which the magnesium fluoride thin film is not formed, and the thin film forming surface of the transparent laminate. The part where the electrode was not formed was bonded via an acrylic adhesive. Here, the acrylic adhesive is 500
The refractive index was 1.64 and the extinction coefficient was 0 in the wavelength region of ６００600 nm.

Further, a polyethylene terephthalate pellet 1203 (manufactured by Unitika Ltd.) was placed at 450 nm or less.
Dye having absorption at 600 nm (Mitsui Toatsu Chemical Co., Ltd.)
And PS-Red-G) (0.014 wt%).
Melted at 60 to 280 ° C and extruded to a thickness of 10
A 0 μm film was produced. Thereafter, this film was biaxially stretched to obtain a color-controlling dye film having a thickness of 50 μm, and a magnesium fluoride thin film having a thickness of 95 nm was formed on one main surface of the film by electron beam evaporation.
Was produced. The visible light reflectance of the antireflection film on the surface on which the antireflection film was formed was 0.8% when obtained in the same manner as in Example 9. The surface of the second anti-reflection film containing the toning dye, on which the thin film is not formed, and the other main surface of the PMMA plate are bonded together via a transparent adhesive material, and the display filter of the present invention is formed. Produced.

Example 15 A 2 mm-thick PMMA plate having an antiglare layer on one side of the transparent laminate of the present invention of Example 1 on which no thin film is formed (Acryfilter manufactured by Mitsubishi Rayon Co., Ltd.) MR-NG, 470mm ×
The surface on which the anti-glare layer (350 mm) was not formed was bonded via a transparent adhesive. When the haze of the anti-glare layer was measured using a haze meter, 2%
Met. Further, in the same manner as in Example 7, an electrode containing metal (specific resistance 5 × 10 ⁻⁵ Ω · cm) was formed.

A toning film was prepared in the same manner as in Example 14, and one main surface of this film was coated with a thermosetting varnish (SF-C-335) 3 manufactured by Dainippon Ink and Chemicals, Inc.
g in a mixed solvent 1 of toluene / methyl ketone (10: 1)
Dissolve in 100 g, apply, air dry, and
This was cured for 2 seconds to form an anti-Newton ring layer having a thickness of 1 μm, thereby producing an anti-Newton ring film.
When the haze of the anti-Newton ring layer was measured using a haze meter, it was 2%. The moisture permeability of the anti-Newton ring film was measured in accordance with ASTM-E96, and was found to be 1.2 g / m ² · day, indicating that it had gas barrier properties. The other main component of the anti-Newton ring (gas barrier) film (a transparent protective layer and an anti-Newton ring layer according to the present invention) which does not include the anti-Newton ring layer, which contains the toning dye and has a gas barrier property. The acrylic adhesive (with a refractive index of 1 to 500 nm to 600 nm) at the surface and the portion of the transparent laminate where the electrode is not formed on the thin film forming surface where the electrode is not formed, and which is in close contact with the display portion when mounted on the display body. 64, and an extinction coefficient of 0) to obtain a display filter of the present invention.

[Embodiment 16] The transparent product of the present invention of Embodiment 1
The main surface of the layered body on which the transparent multilayer thin film is not formed
And a 2mm thick PMMA plate (Mitsubishi Rayon Co., Ltd.
(Crylite, 470mm x 350mm)
I let you. Biaxially stretched polyethylene terephthalate filter
Lumin (thickness: 100 μm) on one major surface
Thermosetting varnish (SF-C-335) manufactured by Ki Chemical Industry Co., Ltd.
3 g of a mixed solvent of toluene / methyl ketone (10: 1)
Dissolve in 100g, apply and air dry, then 150 ℃ 2
1 micron thick anti-Newton ring layer cured for 0 seconds
To form the first anti-Newton ring film
Made. Anti-Newton ring layer haze
It was 2% when measured using a thermometer. First
Anti-Newton ring film is ASTM-E96
When the water vapor transmission rate was measured according to 1.2 g / m ^Two・
day, has a gas barrier property, and has an anti-glare property.
Had the nature.

The opposite main surface of the first anti-Newton ring film and the surface on which the transparent laminate thin film was formed were adhered via an acrylic adhesive (refractive index: 1.64 at 500 to 600 nm, extinction coefficient: 0). At this time, the anti-Newton ring film also formed an end face of the transparent laminate so that the thin film was not exposed to the environment.

Further, in the same manner as in Example 15, a second anti-Newton ring film containing a toning dye was prepared. The second anti-Newton ring film containing the toning dye had anti-glare properties. The other main surface of the second anti-Newton ring film containing the toning dye, on which the anti-Newton ring layer is not formed, is bonded to the other main surface of the PMMA plate via a transparent adhesive. The display filter of the present invention was produced.

The transparent laminate of the present invention of Examples 1 to 6, the transparent laminate of Comparative Example 1, and Example 7 prepared as described above.
The display resistance of the present invention, the surface resistance and the electromagnetic wave shielding ability, the visible light transmittance, the near infrared ray cutting ability, the visible light reflectance, and the environmental resistance of the display filters of the present invention are shown below. The method was evaluated. 1) Sheet Resistance In Examples 1 to 4, 6 and Comparative Example 1, the sheet resistance of the transparent laminate was measured by a four-probe measurement method (probe interval: 1 mm). In Examples 8 and 13, the sheet resistance of the used transparent laminate was measured in the same manner. Table 1 shows the results.

2) Electromagnetic wave shielding ability Using the transparent laminates obtained in Examples 1 to 4, 6 and Comparative Example 1, a display filter obtained by the following method, and a filter obtained in Examples 7, 8, and 13 The obtained display filter was measured for its ability to cut electromagnetic waves.

In each of the transparent laminates of Examples 1 to 4, 6 and Comparative Example 1, the surface on which the thin film was not formed was 2 mm thick.
PMMA plate (Acrylite manufactured by Mitsubishi Rayon Co., Ltd., 4
The main surface (70 mm × 350 mm) was bonded via a transparent adhesive material to produce a display filter. A display filter was installed on the screen of a 21-inch diagonal plasma display, and a dipole antenna was installed at a position 3 m perpendicular to the surface from the center of the screen, and a spectrum analyzer manufactured by Advantest (TP417) was used.
In 2), the radiated electric field intensity in the 20 to 90 MHz band was measured. At this time, the conductive surface of the transparent laminate and the ground electrode of the display main body were brought into contact with each other and grounded.

In the display filters of Examples 7, 8, and 13, the electrode containing metal was brought into contact with the earth electrode of the display body to be grounded. The radiated electric field strength measured as described above is 33, 62, 70, 9
The evaluation was performed at each frequency of 0 MHz. For home use, it is practical to be 40 dBμV / m or less, and the lower the better, the better. The radiated electric field intensity of the plasma display without a display filter was also measured. Table 1 shows the results.

3) Visible Light Transmittance (T _vis ) and Near-Infrared Transmittance The transparent laminates of Examples 1 to 6 and Comparative Example 1, and the display filters of Examples 9 to 13 and Comparative Example 2 were used. The light-transmitting part of the object to be measured was cut into small pieces, and a spectrophotometer (U-340, manufactured by Hitachi, Ltd.) was used.
According to 0), the parallel light transmittance of 300 to 1000 nm was measured. From the transmittance determined here, JISR-3106
The visible light transmittance T _vis was calculated according to The near infrared transmittance was evaluated at 820, 850 nm, and 1000 nm. Table 2 shows the results.

4) Critical distance test for infrared remote controller The transparent laminates of Examples 1 to 6 and Comparative Example 1 and the filters for display of Examples 9 to 13 and Comparative Example 2 have a near-field generated from the plasma display. We evaluated how much interference with the infrared remote controller due to infrared rays can be suppressed. For the transparent laminates of Examples 1 to 6 and Comparative Example 1, and for the display filters of Examples 9 to 11 and Comparative Example 2, the surface of the transparent laminate on which the thin film was not formed and the PMMA having a thickness of 2 mm. A main surface of a plate (manufactured by Mitsubishi Rayon Co., Ltd .: Acrylite (trade name), 470 mm × 350 mm) is laminated with a transparent adhesive material to produce a display filter, and evaluation is performed using the display filter. Was.

The display filter to be tested was set on the screen of a 21-inch diagonal plasma display, and the electronic device using the infrared remote controller was separated from the display of 0.2 m to 5 m, and its malfunction was confirmed. If there was a malfunction, the limit distance was determined.
It can be said that the shorter the limit distance, the less the malfunction. Practically, it is at least 2.5 m or less, preferably 1.5 m or less. The limit distance of the plasma display without a display filter was also measured. Table 2 shows the results.

5) Visible light reflectance (R _vis ) Regarding the transparent laminates of Examples 1 to 4 and Comparative Example 1, an acrylic adhesive (500 to 60) was formed on the thin film forming surface of the transparent laminate.
Before and after forming a refractive index of 1.64 and an extinction coefficient of 0 at 0 nm, the object to be measured is cut into small pieces, and a spectrophotometer (U, manufactured by Hitachi, Ltd.) is used using a reflection integrating sphere (light incident angle 6 °). -3400), the total light reflectance of both surfaces of the measurement object at 300 to 800 nm was measured. The visible light reflectance R _vis was calculated from the reflectance obtained in accordance with JIS R-3016. Table 3 shows the results. Also,
With respect to the transparent laminate of Example 6, and the display filters of Examples 9, 10, 11 to 16, and Comparative Examples 2 and 3, the visible light reflectance R _vis alone was determined. Table 4 shows the results.

6) Environmental resistance (high-temperature high-humidity test) The transparent laminates of Examples 1 and 6 were used.
The display filters of 10, 11, 13 to 16 and Comparative Examples 2 and 3 were allowed to stand in an atmosphere of a temperature of 60 ° C. and a humidity of 95% for 48 hours to examine the occurrence of whitening. If whitening (white spots, whitening of the entire surface) does not occur after standing for 48 hours under these environmental conditions, it can be said that the method is practical. Table 4 shows the results. Table 4 also shows the moisture permeability of the film attached to the thin film forming surface of the transparent laminate in the case of a display filter.

[0156]

[Table 1]

[0157]

[Table 2]

[0158]

[Table 3]

[0159]

[Table 4]

As is clear from Table 1, the sheet resistance was 3 Ω /
In the following, a practical electromagnetic wave shielding effect is clearly recognized, and the lower the sheet resistance, the more effective the electromagnetic wave shielding effect.
However, when the transparent laminate of Comparative Example 1 having a sheet resistance of 4.9Ω / □ is used, the electromagnetic wave shielding effect is not at a practical level depending on the frequency band. In addition, comparing Example 1 with Example 7, it can be seen that the electromagnetic wave shielding effect is increased by forming an electrode containing a metal and bringing the electrode portion into contact with the ground electrode of the display body.

As is clear from Table 2, the filters for display using the transparent laminates of Examples 1, 2, 4, 5, and 6 having a light transmittance of less than 10% in the wavelength region longer than 820 nm, and In addition, the display filters of Examples 12 and 13 have a practical near-infrared ray cut capability with a short malfunction limit distance. The display filter using the transparent laminate of Example 3 has a light transmittance of more than 10% in a wavelength region longer than 820 nm, and has a large malfunction limit distance, but is within a practical range. However, the display filter using the transparent laminate of Comparative Example 1 has a large visible light transmittance, but also a large near-infrared transmittance, and thus has a large malfunction limit distance and is not practical.

Further, the display filters of Examples 9 and 10 in which the near-infrared absorbing dye was used in combination with the transparent laminates of Examples 1 and 2 were improved in near-infrared ray cutting ability and became more practical. The visible light transmittance was reduced as compared with Examples 1 and 2. The display filter of Example 11 in which a near-infrared absorbing dye was used in combination with the transparent laminate of Example 3 was 8
Although the light transmittance in a region having a wavelength longer than 20 nm is less than 10%, the near-infrared ray cut ability is improved, and it has become practical.
Compared with Example 3, the visible light transmittance was reduced. Comparative Example 1
The display filter of Comparative Example 2 in which the near-infrared absorbing dye was used in combination with the transparent laminate of the above, since the light transmittance exceeded 10% in the wavelength region longer than 820 nm even when the near-infrared absorbing dye was used in combination. The malfunction limit distance is large and not practical. When one or more near-infrared absorbing dyes are further added to the transparent laminate of Comparative Example 1 so that the light transmittance in a region longer than 820 nm is less than 10%, the visible light transmittance is significantly reduced. Would.

As is clear from Table 3, I was applied on a transparent substrate.
The transparent laminates of Examples 1 and 3, in which a total of seven TO thin films and thin films are alternately laminated, and the second silver layer counted from the transparent substrate is thicker than the first and third silver layers, Even if a suitable pressure-sensitive adhesive layer is formed on the surface on which the thin film is formed, the visible light reflectance is reduced, which is suitable for use as a display filter. In the transparent laminates of Examples 2, 4 and Comparative Example 1, the visible light reflectance increased by 2% or more after forming the transparent adhesive layer.

As is clear from Table 4, the filters for display of Examples 9 to 11 and Comparative Example 2 using the antireflection layer together have a much lower visible light reflectance than before the formation of the antireflection layer. ing. In particular, IT
The transparent laminates of Examples 1 and 3 were used in which a total of seven O thin films and thin films were alternately laminated, and the second silver layer counted from the transparent substrate was thicker than the first and third silver layers. Examples 9 and 1
The display filter of the first aspect of the present invention is suitable because the visible light reflectance is significantly reduced.

The environmental resistance was the lowest in Example 1 in which the film was not bonded to the surface on which the thin film was formed, and the moisture resistance of the film bonded to the surface on which the thin film was formed was 10 g / m ² · day or more. Example 3 is not practical because white spots occurred.
Further, Example 6 using the thin film of the alloy containing silver was superior to Example 1 in the environmental resistance.

Although not shown in Table 4, the display filters of Examples 14 and 15 were subjected to a high-temperature and high-humidity test. As a result, no whitening occurred in either the light-transmitting portion or the electrode portion. . The display filter of Example 16 was subjected to a high-temperature and high-humidity test. As a result, no whitening occurred in the light-transmitting portion and near the filter end surface. The visible light transmittance of the display filter of Example 14 was 69%, and the visible light reflectance was 2.5%.
The visible light transmittance of the display filter of Example 15 was 67%, and the filter was excellent in antiglare properties. The visible light transmittance of the display filter of Example 16 was 6
7% and excellent antiglare properties.

The transparent laminate of Example 1 has a transmission color of green.
(L calculated from parallel light transmittance^*a ^*b^*A in color system
^*= -8, b^*= 2), but the transparent laminate of Example 1
Displays of Examples 14 to 16 in which toning is used in combination with the body
Filter for gray (L calculated from parallel light transmittance)
^*a^*b^*A in color system^*= -3, b^*= 1)
It is overcolored and will not work when installed on a plasma display.
The trust was excellent. Also, the books of Examples 14 and 15
The display filter of the invention is the same as that of the embodiment 7 of the invention.
Electromagnetic shielding effect equivalent to that of other display filters
It had fruit and could be used favorably. Also, when mounting
The film-forming surface was not damaged.

In addition, when the display filters of Examples 12 to 16 were installed on the screen of the plasma display, malfunctions of peripheral electronic devices did not occur, the image was clear, the reflection was small, and the visibility was good. Was.

The display filters of Examples 12, 15, and 16 were placed on flat glass with the surface on which the anti-Newton ring layer was formed facing down, and placed on the four corners of the display filter at a weight of 500 g. We put weight. The center of the display filter, 3 from directly above
Irradiation was performed with a wavelength-band emission fluorescent lamp (Lupica (trade name) manufactured by Mitsubishi Electric Corporation: power consumption: 20 W), and the occurrence of Newton rings was observed from an angle of 10 to 80 ° with respect to the filter plane. In each case, Newton rings did not occur even when the main surface of the display filter having the anti-Newton ring layer was brought into close contact with the glass plate. The display filters of Examples 12 and 16 did not have any main surface.

When the display filters of Examples 12, 15, and 16 were placed in close contact with the screen of the plasma display, Newton rings did not occur. In particular, the display filters of Examples 12 and 16 were free from Newton's ring, had less reflection, and had good visibility regardless of which surface was installed facing the display.

[0171]

As described above, according to the present invention, it is possible to shield the electromagnetic waves of the intensity generated by the plasma display, to achieve high transparency in the visible region which does not impair the sharpness of the display, and to prevent malfunction of peripheral electronic devices. A transparent laminate having the ability to cut off near-infrared light having a wavelength longer than 820 nm to be induced can be provided. In addition, by using this transparent laminate, it is excellent in high transparency in the visible region that does not impair the sharpness of the display, and in the ability to cut near-infrared light having a wavelength longer than 820 nm that induces malfunction of peripheral electronic devices. , 820 nm
A display filter having a light transmittance of 10% or less in a longer wavelength region can be provided. The filter has electromagnetic wave shielding ability, weather resistance and environmental resistance, anti-glare or anti-reflection ability, and anti-Newton ring property. An excellent display filter can be provided. Further, by using a dye in combination, the near-infrared ray deterrence is further improved and / or
Alternatively, a display filter having a preferred transmission color can be provided.

[Brief description of the drawings]

FIG. 1 is a plan view showing an example of a display filter according to the present invention as viewed from a display side.

FIG. 2 is a cross-sectional view showing an example of the transparent laminate of the present invention.

FIG. 3 is a cross-sectional view showing an example of the display filter of the present invention.

FIG. 4 is a cross-sectional view showing an example of the display filter of the present invention.

FIG. 5 is a cross-sectional view showing an example of the display filter of the present invention.

FIG. 6 is a sectional view showing an example of the display filter of the present invention.

FIG. 7 is a cross-sectional view showing an example of the display filter of the present invention.

FIG. 8 is a cross-sectional view showing an example of the display filter of the present invention.

FIG. 9 is a cross-sectional view showing an example of the display filter of the present invention.

FIG. 10 is a cross-sectional view showing an example of the display filter of the present invention.

FIG. 11 is a sectional view showing an example of a display filter of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Transparent laminated body 11 Transparent base material (A) 12 Transparent conductive layer 13 High refractive index transparent thin film layer 14 Metal thin film layer made of silver or an alloy containing silver 20 Metal-containing electrode 30 Transparent molded body 40 Transparent protective layer (D) 41 Anti-Newton ring layer 42 Anti-reflection layer 43 Anti-glare layer 51 Anti-reflection layer 52 Anti-glare layer 53 Anti-Newton ring layer

────────────────────────────────────────────────── ─── Continued on the front page (51) Int.Cl. ⁷ Identification code FI G09F 9/00 309 G09F 9/00 309A 318 318A H05K 9/00 H05K 9/00 V // H01B 5/14 H01B 5/14 A (72) Inventor Masaaki Yoshikai 2-1-1 Tangodori, Minami-ku, Nagoya City, Aichi Prefecture Inside Mitsui Toatsu Chemical Co., Ltd. (72) Inventor Masato Koyama 2-1-1 Tangodori, Minami-ku, Nagoya City, Aichi Prefecture Mitsui Toatsu Chemicals In-house examiner Yoko Nakajima (56) References JP-A-62-239044 (JP, A) JP-A-7-320663 (JP, A) JP-A-8-55581 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) B32B 1/00-35/00 G09F 9/00 H05K 9/00

Claims (17)

(57) [Claims] 1. A high-refractive-index transparent thin film layer (B) and a metal thin-film layer (C) made of silver or an alloy containing silver are provided on one main surface of a transparent substrate (A). The combination (B) / (C) of the thin film layer (B) and the metal thin film layer (C) is repeated three to six times or less as a repeating unit, and a high refractive index transparent thin film layer (B) is further formed thereon. Are laminated, a conductive surface is formed by a laminated structure of the metal thin film layer and the high refractive index transparent thin film layer, and the sheet resistance on the conductive surface is 3Ω.
/ □ or less, the visible light transmittance is 50% or more,
Further, it is a transparent laminate having a light transmittance in a wavelength range of 820 nm to 1000 nm of 20% or less over the entire wavelength range, and is disposed on the high-refractive-index transparent thin film most separated from the substrate (A) and laminated. A transparent laminate, wherein the increase in visible light reflectance is 2% or less even when a transparent adhesive material, a transparent adhesive layer or a transparent protective layer is laminated. 2. The method according to claim 1, wherein the number of repeating units is three, and the second metal thin film layer counted from the transparent substrate is the first and third metal thin film layers.
The transparent laminate according to claim 1, wherein the transparent laminate is thicker than the first metal thin film layer. 3. A transparent pressure-sensitive adhesive or transparent adhesive layer or a transparent protective layer is laminated adjacently on the high-refractive-index transparent thin film (B) laminated farthest from the transparent substrate (A). The transparent laminate according to claim 1, wherein: 4. The high-refractive transparent thin film layer (B) comprises indium,
The transparent laminate according to any one of claims 1 to 3, wherein the transparent laminate is at least one oxide selected from oxides of titanium, zirconium, bismuth, tin, zinc, antimony, and tantalum. 5. The transparent laminate according to claim 1, wherein the high-refractive-index transparent thin film layer (B) is at least one oxide selected from oxides of indium, tin, and titanium. body. 6. The transparent laminate according to claim 1, wherein the transparent substrate (A) is a transparent polymer molded product. 7. The high refractive index transparent thin film layer (B) is mainly composed of indium oxide.
7. The transparent laminate according to any one of items 6 to 6. 8. A display filter comprising: the transparent laminate according to claim 1; and a metal-containing electrode formed on a conductive surface of the transparent laminate. 9. The display filter according to claim 8, wherein the electrodes are formed continuously on the conductive surface and at the periphery of the conductive surface. 10. A display filter comprising: the transparent laminate according to claim 1; and a transparent protective layer (D) formed on a conductive surface of the transparent laminate. . 11. The transparent protective layer (D) has a moisture permeability of 10 g /
display filter of claim 10, wherein the m is 2 ^· day or less. 12. The display filter according to claim 10, wherein the visible light reflectance on the surface on which the transparent protective layer (D) is formed is 2% or less. 13. The surface of the transparent protective layer (D) having a thickness of 0.1 to 10
The display filter according to claim 10, wherein fine irregularities having a size of μm are formed. 14. A transparent laminate according to any one of claims 1 to 7 and a transparent molded body (E), wherein a main surface of the transparent laminate and one main surface of the transparent molded body are bonded to each other. A filter for a display, which is characterized in that it is used. 15. The display filter according to claim 14, wherein one of an anti-reflection layer, an anti-glare layer and an anti-Newton ring layer is formed on the other main surface of the transparent molded body (E). . 16. A display filter according to claim 14, wherein an anti-Newton ring layer is formed on both main surfaces of the display filter. 17. A transparent laminate according to claim 1, and a first member comprising one kind of layer selected from an anti-reflection layer, an anti-Newton ring layer, and an anti-glare layer; Transparent molded article (E) and transparent protective layer (D)
And a second member made of at least one selected from electrodes including a metal, and a first member, a transparent molded body
(E), a transparent laminate, and a second member, in which order, a filter for a plasma display.