JP3534288B2 - Light control glass and manufacturing method thereof - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light control glass having an electrochromic element formed on a surface of a substrate and a method for manufacturing the same.

[0002]

2. Description of the Related Art A phenomenon in which a reversible electrolytic oxidation or reduction reaction occurs when a voltage is applied to cause reversible color fading is called electrochromism.

By using an electrochromic (hereinafter abbreviated as EC) substance exhibiting such a phenomenon, an EC element (hereinafter abbreviated as ECD) which is colored and decolored by voltage operation is prepared.
It has been attempted for more than 20 years to use a light quantity control element (for example, a light control glass or an antiglare mirror) or a numerical display element using 7 segments.

For example, an ECD (see Japanese Examined Patent Publication No. 52-46098) formed by sequentially laminating a transparent electrode film (cathode), a tungsten trioxide thin film, an insulating film such as silicon dioxide, and an electrode film (anode) on a glass substrate. ) Is known as an all-solid-state ECD.

When a voltage is applied to this ECD, the tungsten trioxide (WO ₃ ) thin film is colored blue. Then this EC
When the reverse voltage is applied to D, the blue color of the WO ₃ thin film disappears,
It becomes colorless. The mechanism of this fading / discoloring has not been clarified in detail, but it is understood that a small amount of water contained in the WO ₃ thin film and the insulating film (ion conductive layer) governs the fading / discoloring of WO ₃ . .

The reaction equation for coloring is estimated as follows. ^{_{H 2 O → H + + OH}} - (WO 3 film = ^{_{cathode) WO 3 + nH + + ne}} - → HnWO 3 colorless blue colored (insulating film = ^{anode) OH - → (1/2) H} 2 0 + (1 / 4) O ₂ ↑ + (1/2) e ^- Other known ECDs include a reduction coloring EC layer (eg WO ₃ ) and an ion conductive layer (eg WO ₃ ) between the upper electrode and the lower electrode. Tantalum oxide) and a reversible electrolytic oxidation layer (for example, oxidation or iridium hydroxide) are laminated [EC three layers], and a predetermined voltage can be applied between both electrodes.

By the way, at least one of the pair of electrode layers that directly or indirectly sandwich the EC layer must be transparent so that the color of the EC layer can be seen outside. Especially transparent
In the case of ECD, both electrode layers must be transparent.

Currently, Sn is used as a transparent electrode material.
O ₂ , In ₂ O ₃ , ITO (mixture of In ₂ O ₃ and SnO ₂ ), ZnO, etc. are known, but these materials have relatively poor transparency and must be thinned. For other reasons
The ECD is usually formed on a substrate (eg glass plate or plastic plate).

Further, the ECD is arranged such that a sealing substrate for protecting the element is arranged so as to face the element substrate, depending on the application.
For example, it is used by hermetically sealing with an epoxy resin or the like. By the way, various types of light control glass using an electric element have been proposed, such as one using ECD or liquid crystal, and have already been put to practical use in liquid crystal.

Although the light control glass using ECD has been delayed in practical use, it has excellent characteristics that liquid crystal can control the energy of transmitted light continuously and has no viewing angle dependency, which are not found in liquid crystals. ECD has various types of materials (mainly electrolytes) such as solution type, gel type and all solid type.

There is a demand for an increase in the size of dimming glass targeted for window materials for buildings and vehicles, and research and development for increasing the size of ECD are also underway. However, EC coloring layer, electrolyte layer,
All-solid-state EC that continuously forms all electrode layers in a thin film
D does not require processes such as bonding and sealing of liquid materials, and is considered to be the largest in size.

A transparent conductive film is used for the electrode layer of the ECD light control glass. Currently, the most widely used transparent conductive film is
Although it is ITO, other materials such as ZnO and SnO ₂ are also being considered. A pair of transparent electrode layers (upper and lower transparent films) using these materials are usually formed on the substrate by a vacuum deposition method, a sputtering method, etc., but have a considerably higher resistance than a metal electrode layer. is there.

Both the upper and lower transparent electrode layers need to be connected to external wiring in order to apply a voltage from an external power source. However, when a transparent electrode part (bus bar part: paired on opposite sides of the upper and lower transparent electrode layers as appropriate) is used as an electrode for connecting to the external wiring corresponding to the upper and lower transparent electrode layers, it is transparent. Since the electrode part has a higher resistance than the external wiring,
A low resistance electrode portion is provided so as to overlap (that is, contact with) the transparent electrode portion. Usually, a low resistance transparent electrode portion is provided in a strip shape (for example, a metal clip is attached) on the edge portion of the transparent electrode layer located on the edge portion of the substrate surface.

The ECD light control glass is used after being sealed with a sealing resin (eg epoxy resin) and a sealing substrate in order to prevent element deterioration. Japanese Patent Application Laid-Open No. 6-167724, which relates to the invention that the present applicant has already applied, describes a method for producing a light control glass, and an electrochromic element including at least an electrochromic layer and a pair of transparent electrode layers sandwiching the electrochromic element is provided as an element. In the method for producing a light control glass formed on the surface of a substrate, a low resistance electrode portion is provided on the transparent electrode layer located inside and inside the end portion of the surface of the element substrate, and the element substrate is used as an intermediate film for laminated glass and a sealing substrate It was disclosed that it was sealed by.

[0015]

There are various technical problems in increasing the size of the ECD light control glass, and a major problem among them is uneven coloring / erasing. This non-uniform coloration is due to EC
D The coloring density is not uniform over the entire surface of the ECD even when a certain amount of time passes during coloring, and a shade difference (color shading) occurs. Also, when the color is erased, a shade difference (color shading) is noticeable. It causes deterioration of durability.

Another problem is that the sealing productivity is poor. The encapsulating resin before curing is liquid, and it is necessary to cure the encapsulating resin with a uniform thickness over the entire element surface to prevent optical distortion and element deterioration of the ECD light control glass. In order to achieve this uniform thickness, it is necessary to appropriately adjust the amount of sealing resin, the applied pressure, and the applied pressure distribution.

For example, if the amount of the sealing resin is set to be sufficiently large to protrude from the substrate surface, adjustment of the pressing force and the pressing force distribution for uniform thickness becomes relatively easy, but the step of removing the protruding resin is required. You will need it. Also, if the amount of sealing resin is reduced so that it does not stick out from the substrate surface, the step of removing the sticking out resin becomes unnecessary, but the pressing force and the pressing force distribution for uniform thickness can be adjusted very much. Difficulty, uniform thickness cannot be achieved, or adjustment takes a lot of time.

Further, in the method for producing a light control glass described in Japanese Patent Application Laid-Open No. 6-167724 related to the invention which the present applicant has already filed, it is possible to improve the appearance, durability and productivity by uniform coloring and decoloring. Although the low resistance electrode part was properly attached to the upper and lower electrode parts (bus bar part) with an adhesive tape, the attachment work may take time, and in the case of long-term use, There is a case where the adhesion of the attachment part peels off, resulting in poor appearance and poor contact between the upper and lower electrode parts and the low resistance electrode part, resulting in a high contact resistance and even when the color is erased and erased. Responsiveness may decrease, and further durability was desired.

The object of the present invention is to improve the productivity and cost of a light control glass which has a uniform appearance and coloration, can maintain a good appearance for a longer time, has longer-term durability, and is excellent in long-term stability. It is about down and manufacturing.

[0020]

[Means for Solving the Problems] With the increase in size of ECD light control glass, the distance between the low resistance electrode portions provided on the transparent electrode layer located at the edge of the substrate surface increases. FIG. 7 is a schematic cross-sectional view of the ECD light control glass, and FIG. 9 shows a conventional ECD light control glass, which has a low resistance electrode portion (for example, metal Fig. 9 (a)] is a diagram that schematically shows how the current I flows when a voltage is applied to an ECD with a large gap between H1 and H2 [Fig. 9 (a)], and the resulting coloring of the ECD light control glass. FIG. 9 (b)].

As the ECD becomes larger, the resistance of the transparent electrode layer increases and becomes larger than the inward resistance of the ECD. Therefore, as shown in FIG. It flows from one end into the ECD where it is relatively low-resistance and easy to flow, and as a result, the part near the low-resistance electrode part H1 is colored quickly and darkly, but from the central part away from the low-resistance electrode part H1 to the other end, It turned out that almost no current flows and the coloring becomes very slow and thin, especially in large ECDs.

It was also found that even when the color was erased, the tendency of non-uniformity was less than in coloration, but the color was erased non-uniformly due to the same cause. Fig. 6 shows the conventional ECD light control glass 4
FIG. 6 is a schematic plan view showing a state in which four conductive clips H are attached to the four side end portions of the substrate of FIG.

Therefore, it is understood that the resistance of the transparent electrode layer should be made as small as the internal resistance of the ECD in order to obtain a large ECD in which uniform current flows as shown in FIG. It was

In order to reduce the resistance of the transparent electrode layer,
Although low resistance electrode materials may be used, the current transparent electrode materials (ITO, ZnO, SnO _2, etc.) cannot sufficiently meet this requirement.

Regarding the method of forming a low resistance electrode part, the present inventors used an intermediate film for laminated glass for sealing ECD light control glass, and directly heat-bonded the low resistance electrode part to the intermediate film, When the low resistance electrode portion and the edge portions of the upper and lower transparent electrode layers corresponding to the bus bar portion (upper and lower electrode portions) are brought into direct contact with each other, the peeling phenomenon described above does not occur even after long-term use, and It is possible to manufacture a light control glass with uniform decoloring that can maintain a good appearance for a longer period of time, has longer-term durability, and is excellent in long-term stability. I found that I can do it.

According to the present invention, in a light control glass having an electrochromic element having at least an electrochromic layer and a pair of transparent electrode layers sandwiching the electrochromic layer formed on the surface of an element substrate, a low resistance corresponding to a bus bar portion on the transparent electrode layer is provided. Light control glass characterized in that an intermediate film for laminated glass having a low resistance electrode portion provided in advance at a position corresponding to the electrode portion is laminated on a transparent electrode layer, and the low resistance electrode portion is an element substrate surface. It is composed of a conductive foil or wire formed on the transparent electrode layer at the end position, and a part of the foil or wire projects outward from the edge of the interlayer film for laminated glass, The light control glass described above, which serves as a connection portion with a lead wire, and a conductor connected to the low resistance electrode portion on the upper transparent electrode layer in a region where the pair of transparent electrode layers overlap. There is provided the above-described light control glass, characterized in that formed by arranging - sexual wire.

Furthermore, the present invention provides a method for producing a light control glass in which an electrochromic element comprising at least an electrochromic layer and a pair of transparent electrode layers sandwiching the electrochromic layer is formed on the surface of an element substrate, wherein a bus bar is provided on the transparent electrode layer. In order to provide a low resistance electrode part corresponding to the − part, an intermediate film for laminated glass having a low resistance electrode part provided in advance at a position corresponding to the low resistance electrode part is laminated on the transparent electrode layer. The low resistance electrode portion that provides a method for producing glass may be adhered to the interlayer film for laminated glass by heat, and the temperature of the heat is preferably about 80 ° C. or higher and 150 ° C. or lower.

The means for attaching may be heat generated by energization, or heat generated by a soldering iron or the like. Further, the interlayer film for laminated glass,
Plasticized polyvinyl butyral or modified ethylene vinyl acetate is preferred.

[0029]

BEST MODE FOR CARRYING OUT THE INVENTION In the light control glass of the present invention, not only on the transparent electrode layer located at the end of the substrate surface but also on the upper transparent electrode layer inside the substrate surface inside the outline of the transparent electrode layer pattern. By providing a low-resistance electrode section (hereinafter, this low-resistance electrode section is also called an auxiliary bus bar) on the upper and lower transparent electrode layers, the distance between the low-resistance electrode sections is reduced and the resistance of the transparent electrode layer becomes the internal resistance of the ECD. You can get closer.

As a result, the current I when a voltage is applied to the ECD sufficiently flows not only in the ECD internal direction as shown in FIG. 8 but also in the horizontal direction of the upper transparent electrode layer and has a relatively low resistance. Since there is a diffusion effect of coloring inside, ECD
The entire surface can be colored uniformly.

Examples of the material for the bus bar include gold, silver,
A metal wire such as aluminum, copper, platinum, chromium, tin, zinc, nickel, ruthenium, rhodium or stainless steel, a metal foil and a metal thin film or a conductive paste can be used.

A portion of the bus bar provided at the end of the sheet R is projected outward from the end edge of the interlayer film for laminated glass and then reheated.
It is preferable that the connecting portion is connected to a wire, and when a metal foil or a metal wire is used, it is sufficient to bend the end portion by 90 ° outward with respect to the length direction.

By the way, regarding the length of the bus bar, if the full length of the side of the substrate is too long or too long, the corner-4 at the time of coloring will
It is preferable to make the length shorter than the length of the minus side of the substrate (probably less affected by voltage drop due to energization), because the transmittance of the portion becomes too low and the overall balance cannot be achieved. The optimum bus bar length is the applied voltage, IT
Determine as appropriate in consideration of complex factors such as O resistance, ECD resistance, ECD shape, and operating temperature.

As shown in FIGS. 7 to 9, one bus bar is provided for each of the lower ITO electrode portion and the upper ITO electrode portion (1
It is not necessary to shorten the length of the bus bar if it is on each side. In addition, the interlayer film for laminated glass according to the present invention,
For example, plasticized PVB (polyvinyl butyral) or modified EVA (ethylene vinyl acetate) is preferred,
There is no particular limitation as long as it is similar to these.

The laminated structure of the ECD in the present invention is not particularly limited, but the solid ECD structure is, for example, an electrode layer / EC layer (oxidation coloring film or reduction coloring film) / ion. There are a four-layer structure such as a conductive layer / electrode layer, and a five-layer structure such as an electrode layer / reduction coloring type EC layer / ion conductive layer / reversible electrolytic oxidation layer / electrode layer [FIG. 7].

As the reduction-colored EC layer, generally, WO ₃ , Mn is used.
O ₃ , V ₂ O _5, etc. are used. As the ion conductive layer, for example, silicon oxide, tantalum oxide, titanium oxide, aluminum oxide, niobium oxide, zirconium oxide, hafnium oxide, lanthanum oxide, magnesium fluoride or the like is used. Further, the ion conductive layer is an insulator for electrons, but is a good conductor for protons (H ⁺ ) and hydroxy ions (OH ⁻ ). A cation is required for the coloration / decoloration reaction of the EC layer, and H ⁺ and Li ⁺ must be contained in the EC layer and the like. H ⁺ does not have to be an ion from the beginning, and H ⁺ may be generated when a voltage is applied, and thus water may be contained instead of H ⁺ . The amount of this water is very small and sufficient, and even water that naturally invades from the atmosphere often wears and disappears.

Examples of the reversible electrolytic oxidation layer include iridium oxide or hydroxide, nickel, chromium, ruthenium, rhodium and the like. These substances may be dispersed in the ion conductive layer or the transparent electrode layer, or conversely may be dispersed therein.

The oxidation coloring film (reversible electrolytic oxidation layer) or the reduction coloring film (reduction coloring type EC layer) may be either up or down, but the same film is used above and below. do not do.

In the above case, either the EC layer or the ionic conductive layer may be on either side. Further, in the above case, a reversible electrolytic oxidation layer (or a catalyst layer) may be arranged with an ion conductive layer sandwiched between the EC layers (which may also serve as an oxidation coloring EC layer).

[0040]

EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited thereto.

Example 1 All solid type ECD of about 45 cm × 45 cm size shown in FIGS.
(Electrochromic element) Light control glass 1 was produced by the following procedure.

(1) A lower ITO electrode layer B was formed on the entire surface of a glass element substrate S having a size of about 45 cm × 45 cm by DC sputtering. Substrate heating temperature during sputtering is approx.
At 200 ° C., the film thickness of the ITO electrode layer was about 1000Å, and the sheet resistance of the ITO electrode layer was about 25Ω / port.

(2) As shown in FIGS. 2 and 3, by photo-etching, the IT in the regions B ′ and B ″ on both sides of the lower ITO electrode layer is formed.
The O 2 electrode layer was removed. Alternatively, these patterns may be directly formed by mask-depositing ITO.

(3) Reversible electrolytic oxidation layer C composed of a mixture of iridium oxide and tin oxide by DC sputtering,
Tantalum oxide ion conductive layer D, Tungsten oxide layer E
Were sequentially formed.

(4) An upper ITO electrode layer A was formed by DC sputtering to prepare an ECD. The substrate is not heated during sputtering (heating causes deterioration of the EC layer previously formed), and the film thickness of the upper ITO electrode layer A is set to about 3000 Å
The sheet resistance of ITO electrode layer A is about 25Ω, which is the same as that of lower electrode layer B.
/ I tried to speak.

(5) Sheet R which is an interlayer film for laminated glass
Cut out (modified EVA or plasticized PVB) to a size of about 45 cm x 45 cm, and place it in a predetermined place on the sheet R [J in Fig. 1 to 3 (low resistance electrode part for upper transparent electrode = bus bar), K (bottom part) Position of low-resistance electrode part for transparent electrode = bus bar)] Copper foil with embossing (thickness 10 μm, width 2.5 mm, length 25 mm. No embossing is required, but post-process alignment (sealing) )
(Sometimes it is preferable to have this processing because good adhesion can be obtained.)
A voltage of 7V AC was applied to the current-carrying terminals with a space of about 1 cm, and an arbitrary point on the copper foil was pressed, a slight spark was generated, and the copper foil and the sheet R were momentarily bonded. Such an operation was continuously performed at ten or more locations per copper foil.

The place where the copper foil and the sheet R are bonded may be appropriately determined depending on the sizes of the copper foil and the sheet R.
Further, the size and shape of the current-carrying terminal may be appropriately determined, and the present invention is not limited to this example. Also, a plurality of energizing terminals may be used.

Since the copper foil will be connected to the lead wire later, a portion not adhered to the sheet R is provided, and the copper foil adhered from the edge of the sheet R to the outside in the length direction. It was bent at 90 ° (J '(upper electrode portion = bus bar connection portion), K' (lower electrode portion = bus bar connection portion) in Figs. 1 to 3). Even if the applied voltage is not so large, the copper foil and sheet R
And was well bonded. The applied voltage is approximately AC or DC.
It is preferable that the voltage is 3 to 10 V and within about 1 second. Also, the temperature of the soldering iron is about 80 to 150 ° C., and the holding time is within about 1 second, which means almost instant adhesion. Regarding the adhesive force, any adhesive can be used as long as it can maintain low-resistance conduction without causing a change in increase in energization resistance over a long period of time, and such an adhesive method may be used.

(6) A sheet R (EVA film: Dumiran) obtained by welding the embossed copper foil by the above method.
F300, approx. 250 μm) and glass encapsulation substrate G, the sheet R, which is the copper foil welding EVA film (with the copper foil welding surface facing the EC element surface of the element substrate), has an EC element Device substrate S (device side is inward) and sealing substrate G that are glass plates
And are laminated in a sandwich shape so that the copper foil is located at the bus bar position on the transparent electrode layer formed in the step (4), and using a laminator (for press), for example, about 40 ° C, about About 0.1 to 0.5 Torr in 5 minutes or / and about 85 ° C. in about 25 minutes.
The elements were sealed by pressure bonding under conditions such as 1 to 5 Torr, and then cooled to seal the element.

There is no particular limitation on the method such as the procedure of sealing by matching. (7) Bus bar J of upper electrode layer and lower electrode layer, J'of K,
External wiring (terminals LA and LB of the external wiring) were bonded to k ', respectively, to fabricate ECD light control glass 1 . The position for bonding is not particularly limited to the left and right, and a sheet R (for example, a copper foil, a wire or the like (auxiliary bus bar)) attached to the central portion (without needing to be attached) is used. The optimal position may be selected as appropriate.

An erasing voltage of about +1.5 V from the driving power supply Su is applied to the ECD light control glass 1 thus manufactured through the terminals LA and LB for about 5 minutes, and the ECD light control at this time is performed. Glass 1
The transmittance distribution measured by the C light source on the entire surface of the colored part was about 22 to 27%, and it was as shown in Fig. 8 (b), and no particularly noticeable non-uniform coloring was observed. It was Next, when an erasing voltage of about -1.5 V was applied for about 1 minute, the transmittance was restored to about 65 to 68%, and no noticeable color unevenness was observed during erasing.

Example 2 As shown in FIG. 5, bus bars J, J of copper foil or copper thin film formed on opposite ends of the upper transparent electrode (dotted line A).
About 0.2mmφ with nickel plating to connect
Conductive wire made of copper wire with a length of approximately 44.5 to 45 mm- (2
An ECD light control glass 2 was produced in the same manner as in Example 1 except that a sheet R was formed by arranging five dashed-dotted lines W) at intervals of about 5 cm to form an auxiliary bus bar for the low resistance electrode portion.

The leakage current measured by applying an erasing voltage of about -1.5 V to the ECD light control glass 2 from the driving power supply Su for about 1 minute is about -0.8 mA, which is more than that of the first embodiment. Slightly increased. The reason why the leakage current is a little large is that, as shown in FIG. 5, pressure is applied at the place where the nickel-plated copper wire bus bar is provided, and there is some influence on the overlapping portion of the upper and lower transparent electrodes A and B patterns. .

Approximately + from the drive power supply Su to the ECD light control glass 2
A coloring voltage of 1.5 V was applied for about 2 minutes, and the transmittance distribution by the C light source on the entire surface of the coloration / erasing part of the ECD light control glass 2 at this time was measured and was about 20 to 23%. 1
Similarly, no noticeable non-uniform coloring was observed.

Next, when an erasing voltage of about -1.5 V was applied for about 1 minute, the transmittance was restored to about 67 to 70%, and no noticeable color unevenness was observed during erasing. Also, the response is about
The reason why the speed was 2-3 times faster is that the sheet resistance of the upper ITO film was apparently raised or lowered because the upper ITO film was provided with the nickel-plated copper wire bus bar.

The nickel-plated copper wire bus bar used as the auxiliary electrode is not limited to this and may be any conductor having a low resistance, but the resistance of the conductor is preferably about 3 Ω or less. . When it is about 3Ω or more, the effect as an auxiliary electrode on the upper ITO film is weakened,
Less improvement in responsiveness. Even more preferably about 0.
It is about 5 Ω or less (the lower the better).

Example 3 A sheet for attaching the copper foils of the bus bars J and K shown in FIG.
An ECD dimming glass was prepared in the same manner as in Example 1 except that a silver thin film with a silver paste or a copper thin film was mask-deposited at a position on R.

From the drive power supply Su to this ECD light control glass
The leak current measured by applying a decoloring voltage of 1.5 V for about 1 minute was about -0.5 mA. Applying a coloring voltage of about + 1.5V from the drive power supply Su to this ECD light control glass for about 5 minutes,
At this time, the transmittance distribution by the C light source was measured on the entire surface of the ECD light control glass, which was about 21 to 26%. As with Example 1, uneven coloration was observed. Was not done. Next, when an erasing voltage of about -1.5 V was applied for about 1 minute, the transmittance was restored to about 65 to 68%, and no noticeable color unevenness was observed during erasing.

Comparative Example 1 The size was about 25 cm × 15 cm, the cross section was U-shaped and the length was about
15cm phosphor bronze or stainless conductive clip H
Two pieces of (H1, H2) are prepared, and two pieces of these conductive clips H are attached to the opposite sides of the end of the element substrate as shown in FIG. 9, so that the conductive clips H are placed on the upper and lower electrode layers. An ECD dimming glass was produced in the same manner as in Example 1 except that the take-out portion of (1) was pressure-bonded.

From the drive power supply Su to this ECD light control glass,
The leakage current measured by applying a decoloring voltage of 1.5 V for about 0.5 minutes was about -0.1 mA. Applying a coloring voltage of about + 1.5V from the drive power supply Su to this ECD light control glass for about 3 minutes, and at this time C
When the transmittance distribution by the light source is measured, it is about 27-35%. As shown in (a) and (b) of FIG. Annoying non-uniform coloring was observed. Next, when a decoloring voltage of about -1.5 V was applied for about 0.5 minutes, the transmittance was restored to about 65 to 68%, but annoying color unevenness was observed during the decoloring.

The method for producing the light control glass of the present invention is EC
I explained D in detail, but not only in the ECD field, but also in the liquid crystal (LC
It goes without saying that it can be widely adopted in fields similar to these, such as field D).

Comparative Example 2 The size was the same as in Example 1, the cross section was U-shaped, and the length was about 25.
cm conductive phosphor bronze or stainless steel conductive clip H
Four (H1, H2) are prepared, and four conductive clips H are attached to the opposite sides of the element substrate edge as shown in FIG. 6, so that the conductive clips H are attached to the upper and lower electrode layers. ECD light control glass 4 was produced in the same manner as in Example 1 except that the take-out portion was pressure-bonded.

From the drive power supply Su to this ECD light control glass,
The leak current measured by applying a decoloring voltage of 1.5 V for about 1 minute was about -0.5 mA. Applying a coloring voltage of about + 1.5V from the drive power supply Su to this ECD light control glass for about 5 minutes,
At this time, the transmittance distribution by the C light source was measured on the entire surface of the ECD light control glass, which was about 30 to 38%, and an uneven current flow showing the same tendency as in Comparative Example 1 flowed. Annoying non-uniform coloring was observed. Then about -1.
When 5V erasing voltage is applied for about 1 minute, the transmittance is about 67-70.
%, But still noticeable color unevenness was observed during the erasing.

The method for producing the light control glass of the present invention is EC
I explained D in detail, but not only in the ECD field, but also in the liquid crystal (LC
It goes without saying that it can be widely adopted in fields similar to these, such as field D).

[0065]

As described above, according to the present invention, the low resistance electrode portion (bus bar) is heat-welded to the interlayer film for laminated glass by utilizing heat generation of electric current and the like, and the low resistance electrode portion (bus bar) is attached to the end portion of the substrate surface. Since it is pressure-bonded on the transparent electrode layer and is sealed by this element substrate and sealing substrate, the color tone is uniform and the good appearance can be maintained for a long time, and it has long-term durability and long-term durability. The dimming glass having excellent stability and responsiveness can be manufactured with high productivity, and the cost can be reduced.

Further, by providing the low resistance electrode portion (auxiliary bus bar) connected to the pasted low resistance electrode portion (bus bar) in the region where the pair of transparent electrode layers overlap, the response is further improved. It is possible to manufacture a light control glass having excellent durability.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of an ECD light control glass according to a first embodiment.

FIG. 2 is a schematic plan view showing a bus bar pattern and the like of the ECD light control glass according to the first embodiment of FIG.

FIG. 3 is a schematic perspective view of an ECD light control glass according to the first embodiment of FIG.

FIG. 4 is an explanatory diagram showing a method of adhering a bus bar to an intermediate film according to Example 1.

FIG. 5 is a schematic plan view showing patterns and the like of a bus bar and an auxiliary bus bar of the ECD light control glass according to the second embodiment.

FIG. 6 is a schematic plan view showing a state in which a conductive clip is attached to an end portion of a substrate in a conventional light control glass.

FIG. 7 is a schematic sectional view of an ECD light control glass.

FIG. 8 shows the current I in the ECD light control glass according to the present invention.
Fig. 8 (a) is a schematic diagram showing the flow of light, and Fig. 8 (b) is a plan view showing the coloring of the ECD light control glass.

9 is a schematic diagram showing how a current I flows in the ECD light control glass of Comparative Example 1: FIG. 9 (a), and the resulting EC
FIG. 9 (b) is a plan view showing the coloring of the D light control glass.

[Explanation of symbols] 1 ... ECD light control glass 2 ... ECD light control glass 4 ... ECD light control glass A ... Upper ITO electrode layer B ... Lower ITO electrode layer E ... Oxidation Tungsten layer D ... Ion conductive layer C ... Reversible electrolytic oxidation layer ECD ... Electrochromic element R ... Sheet (interlayer film for laminated glass) S ... Element substrate G ... Encapsulation Substrate H ... Conductive clip J ... Low resistance electrode portion (bus bar) for upper transparent electrode K ... Low resistance electrode portion (bus bar) for lower transparent electrode J '... Upper electrode portion (bus bar) Connection part K '... Connection part of lower electrode part (bus bar) I ... ECD drive current W ... Conductive wire- (an example of auxiliary bus bar) LA ... Terminal of external wiring from J' LB ・ ・ ・ External wiring terminal from K'Su ・ ・ ・ Drive power supply

Front page continuation (58) Fields surveyed (Int.Cl. ⁷ , DB name) G02F 1/15 502 C03C 27/12

Claims (6)

(57) [Claims] 1. A light control glass in which an electrochromic element comprising at least an electrochromic layer and a pair of transparent electrode layers sandwiching the electrochromic layer is formed on a surface of an element substrate, and a low resistance electrode portion corresponding to a bus bar portion on the transparent electrode layer. 1. A light control glass comprising an intermediate film for laminated glass, which is provided with a low resistance electrode portion in advance at a position corresponding to, on a transparent electrode layer. 2. The low resistance electrode portion is made of a conductive foil or wire formed on the transparent electrode layer at a position of an end portion of the surface of the element substrate, and a part of the foil or wire is the bonded layer. It protrudes outward from the edge of the interlayer film for glass,
The light control glass according to claim 1, which is a connection portion with a lead wire. 3. A conductive wire connected to the low resistance electrode portion is disposed on the upper transparent electrode layer in a region where a pair of transparent electrode layers overlap each other. 1. The light control glass according to 1 or 2. 4. A method for manufacturing a light control glass in which an electrochromic element comprising at least an electrochromic layer and a pair of transparent electrode layers sandwiching the electrochromic layer is formed on a surface of an element substrate. In order to provide a resistance electrode part, an intermediate film for laminated glass in which a low resistance electrode part is previously provided at a position corresponding to the low resistance electrode part is laminated on the transparent electrode layer, and a method for producing light control glass. . 5. The method for producing light control glass according to claim 4, wherein the low resistance electrode portion is attached to the interlayer film for laminated glass by heat. 6. The method for producing light control glass according to claim 4, wherein the interlayer film for laminated glass is plasticized polyvinyl butyral or modified ethylene vinyl acetate.