JPH0721996A - Electric bulb and electric bulb with reflector - Google Patents

Abstract

PURPOSE:To obtain an electric bulb with a long service life, in which the anti- vibration strength is high, a reflected infrared ray is returned to a filament efficiently, and a partial overheating is not generated to the filament. CONSTITUTION:In a glass bulb 1 in which a light permeating infrared-ray reflecting membrane 8 is formed on at least one side of the inner or the outer surface, plural single coil filaments 21, 22, 23, and 24 provided extending in the bulb axial direction are provided, and at the same time, a bulb L in which an inert gas is sealed is installed. The reflected infrared ray is dispersed to some of the plural single coil filaments 21 to 24 provided in the bulb 1 separated from the center axis, and returned, and no high temperature hot spot is generated to the filaments 21 to 24. As a result, an early wire breaking is prevented and a long service life is realized. And since the filaments are all the single coil filaments, they can be maintained by numerous anchors at the intermediate positions, and they are strong to a vibration or an impact.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light bulb in which a multilayer bulb such as a visible light transmitting infrared reflecting film is formed on the surface of a glass bulb such as a halogen bulb.

[0002]

2. Description of the Related Art Various efforts have been made in the field of light bulbs as a part of energy saving. For example, in a halogen light bulb, a visible light transmitting infrared reflecting film is formed on the surface of a bulb so that the light is emitted from a coiled filament. It is known that infrared rays are reflected by this reflective film and returned to the coil-shaped filament, thereby heating the coil-shaped filament and increasing the luminous efficiency.

As the visible light transmitting infrared reflecting film, a high refractive index layer film made of titanium oxide (TiO2) or the like and a low refractive index layer film made of silicon dioxide (SiO2) or the like are alternately laminated to form a multilayer film. By appropriately selecting the number of layers and the thickness of layers, light interference is used to selectively transmit and reflect light in a desired wavelength range.

In this light bulb, the larger the number of layers of the film, the higher the reflectance of infrared rays and the greater the effect of power saving.

A filament of a light bulb having such a visible light transmitting infrared reflecting film formed thereon is provided with a double coiled filament on the central axis of the bulb in order to concentrate the reflected infrared light from the reflecting film on the filament. ing. Since this double-coil-shaped filament can make the light emitting part small, if the filament can be accurately arranged on the central axis of the bulb, the infrared feedback rate will be high, but if the position is slightly biased, the feedback rate will be high. Deteriorates and the luminous efficiency decreases.

Further, the double-coiled one has an advantage that the filament has a good heat-retaining effect and can be made highly efficient, but its vibration resistance is extremely weak. It is possible to support the middle part of the filament with anchors as a means of improving this vibration resistance, but since the coil length is short, the number of anchors cannot be increased, and if there are anchors, the anchors short-circuit between coil pitches. Sometimes that part does not emit light.

If the filament is located on the central axis of the bulb, the reflected infrared rays may concentrate and return to the central portion of the filament, which causes a hot spot at the central portion. The occurrence of this hot spot is that the central part of the filament is overheated to a high temperature, so that the tungsten of this part forming the filament is sputtered, and it becomes thinner than the other part and may be disconnected early. .

[0008]

DISCLOSURE OF THE INVENTION According to the present invention, a bulb having a visible light transmitting / infrared reflecting film formed on a bulb, in which a double coil filament is arranged along the bulb axis, has low vibration resistance. In addition, since hot spots are created on the filaments, the composition of the filaments is slightly changed and multiple single coils are arranged side by side to deal with vibrations, and the reflected infrared rays return to one of the filaments to prevent partial overheating of the filaments. The purpose is to provide a long-life light bulb.

[0009]

The light bulb according to claim 1 of the present invention comprises a glass bulb, a visible light transmitting infrared reflecting film formed on at least one of the inner and outer surfaces of the glass bulb, and A plurality of single coil filaments extending in the valve axial direction and arranged at substantially equal distances from the valve center axis, and an inert gas sealed in the valve. It has a feature.

In the light bulb according to claim 2 of the present invention, the bulb corresponding to the plurality of single coil filaments extending in the bulb axial direction has a cylindrical shape, and a visible light transmitting infrared reflecting film is formed on the surface. It is characterized by being.

A light bulb according to a third aspect of the present invention is characterized in that the bulb is filled with a halogen gas together with an inert gas.

A light bulb with a reflector according to a fourth aspect of the present invention is characterized in that the light bulb according to any of the first to third aspects is mounted in the reflector.

[0013]

[Function] By using the single coil filament, the number of supporting points by the anchor increases and the vibration resistance is improved, and since the reflected infrared rays are returned to any one of the plurality of single coil filaments, the efficiency is not lowered and The single coil filament has no risk of partial overheating.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view of a halogen light bulb L for small light projection, FIG. 2 is a side view, FIG. 3 is a filament shaping view, FIG. 4 is an enlarged perspective view of a mount, and FIG. FIG. 6 is a partially enlarged side sectional view of the glass bulb.

In the figure, reference numeral 1 denotes a cylindrical bulb made of quartz glass, in which a mount 2 described later and an inert gas such as argon containing halogen such as bromine or chlorine are enclosed. The mount 2 is held by sealing the molybdenum foils 4 and 4 connected to the lower ends of the inner lead wires 3 and 3 in a sealing portion 5 formed by crushing one end of the bulb 1. The crushable sealing portion 5 is housed in a ceramic holder 6a included in the metal die 6 and is joined and held by a silicon-based heat resistant adhesive (not shown) or the like. Further, although not shown, one end side of the external lead wire is connected to the other end side of each molybdenum foil 4, 4,
The other end of the external lead wire is connected to the terminal of the base 6.

Reference numeral 7 is an exhaust pipe provided at the other end of the bulb 1, and 8 is a visible light transmitting infrared reflecting film (hereinafter referred to as a multi-layer interference film) formed on the outer surface of the bulb 1.
It is called the red film. ).

As shown in the enlarged view of FIG. 3, the mount 2 includes a bead glass 9 made of quartz glass or the like, and a pair of internal lead wires 3 and 3 and an anchor 1 made of, for example, molybdenum.
1, 12 and 13 are planted and a filament 20 is connected between the internal lead wires 3 and 3.

This filament 20 is shaped as shown in FIG. That is, the single-coil filaments 21, 22, 2 forming the light-emitting portion, which is roughly divided into four, are
Locking coil portions 26, 26 are formed at the portions having the coil portions 3, 24, which are connected to the single coil filaments 21, 24, through skip winding portions 25, 25 obtained by extending a coiled portion. In addition, the coil of the shaped corner portion is slightly stretched.

As shown in an enlarged view in FIG. 4, the filament 20 is inserted into the bent tip portions 3a, 3a of the inner lead wires 3, 3 by inserting the locking coil portions 26, 26 at both ends into a single coil filament. The distal end 11a of the bent anchor 11 is inserted through the intermediate portion 27 of the reference numerals 21, 22 and the distal end 13a of the bent anchor 13 is inserted through the intermediate portion 28 of the single coil filaments 22, 23. The tip portion 12a of the bent anchor 12 is inserted into the intermediate portion 29 of 24, and the single coil filaments 21, 22, 23, 24 interposed in these insertion portions are short-circuited.

Further, the single coil filaments 21, 22, 23, 24 of this filament 20 extend in the valve axial direction, and as shown in FIG. 5, each single coil filament 21, 22, 23, 24 is located at the center of the valve. It is located at a position substantially equidistant R on the axis 1B.

Further, as shown in FIG. 6, on the outer surface of the glass bulb 1, for example, TiO ₂ constituting the high refractive index layer films 8H, ... And SiO ₂ constituting the low refractive index layer films 8L ,.
The visible light transmitting / infrared reflecting film 8 is formed by alternately repeating the above and laminating a predetermined number of layers, and depositing them by means such as vapor deposition and dipping.

When the light bulb L having such a structure is turned on, the bulbs 4 are arranged concentrically around the central axis 1A of the bulb 1.
Of the light emitted from the single-coil filaments 21, 22, 23, 24 of the book, visible light passes through the bulb 1 and the red anti-reflector membrane 8 and is emitted to the outside of the bulb 1. Further, the infrared rays emitted from these single coil filaments 21, 22, 23, 24 are reflected by the red anti-reflective film 8 formed on the surface of the bulb 1 having a circular cross section and return to the vicinity of the central axis 1A of the bulb 1. .
Although the filament is not originally located on the central axis 1A of the bulb 1, infrared rays are dispersed in any of the four single-coil filaments 21, 22, 23, 24 arranged in close proximity so as to surround the central axis 1A. Then, the infrared rays that have passed through the single coil filaments 21, 22, 23, 24 are repeatedly reflected by the red anti-reflective film 8 again, and finally the single coil filaments 21, 22,
These single coil filaments 2 are made incident on 23 and 24.
The temperatures of 1, 22, 23, and 24 can be further raised to increase the luminous efficiency.

Therefore, the infrared rays reflected from the red film 8 are dispersed and returned to the four single coil filaments 21, 22, 23 and 24 in the vicinity of the central axis 1A of the bulb 1 to generate a high temperature hot spot due to filament overheating. It is also possible to prevent the filament material tungsten from evaporating locally and prevent the filament material from being thinned and broken at an early stage, so that the bulb L having a long life can be provided. Further, since a large number of anchors supporting filaments can be used, a light bulb L having improved strength against vibration and shock can be obtained.

Existing light-emitting halogen bulb JD110V8
Except for the 5W and the mount, the other parts manufactured with the same size and the same material showed almost no change in various characteristics in the static test, and were able to obtain a marked strength in the vibration test. .

Incidentally, the dimensions of each part are as follows: glass bulb length about 45 mm, bulb internal space length about 25 mm, bulb outside diameter about 11 mm, bulb inside diameter about 8.5 to 9 mm, single coil filament length about 10 mm, single coil filament The wire diameter is about 0.07 mm, the inner diameter of the single coil filament is about 0.
35 mm, concentric diameter (2R) with 4 single coil filaments arranged about 4 mm, filled inert gas Ar 90% +
N10% is about 2300 torr (about 3 atm).

FIG. 7 shows another embodiment of the present invention.
FIG. 7 shows a halogen light bulb RL integrated with a reflecting mirror. Since the light bulb L has the same shape as that of FIGS. 1 to 6 (however, there is no base), the same parts as those of FIGS. The description thereof will be omitted.

In the figure, 90 is a reflecting mirror having a reflecting surface in the shape of a rotating paraboloid, a spheroid, or the like formed of hard glass, heat-resistant synthetic resin, metal, or the like, and aluminum, chrome, or silver on the inner surface. A visible / light-reflecting infrared ray transmitting film 91 such as a light / heat reflecting film or a dichroic film is formed, and a central portion of the base portion 92 has a recess 93 for accommodating the crushable sealing portion 5 of the light bulb L. is doing. Then, a heat-resistant adhesive 94 such as a silicon-based adhesive is injected in a state where the collapsed sealing portion 5 of the light bulb L is placed in the recess 93, and when the focusing of the position of the filament 20 with respect to the reflecting surface 11 is completed, this adhesive 94 is solidified and both are integrated.

The bulb RL with a reflecting mirror shown in FIG. 7 is also
Since the bulb L itself has a long life and improved characteristics such as vibration resistance, good characteristics can be obtained.

The present invention is not limited to the above embodiment. For example, the filament forming the mount has been described as having four single coil filaments.
The number of books is not limited to two, and may be two or more. Further, the extending direction of the single coil filament is preferably parallel to the valve axis, but as shown in FIG. 8, it may be slightly inclined with respect to the central axis 1A, and it is arranged as close as possible. Is good. Further, the end portion or the intermediate portion of the filament supported by the lead wire or the anchor may be a coiled portion or a skip winding portion 25 obtained by extending the coiled portion, and the filament is not pre-shaped. May be.

If the plurality of single coil filaments arranged at substantially equal distances are close to each other, there is a possibility that arc discharge may occur between the single coil filaments or between the lead wires. Can be dealt with by increasing the distance, increasing the amount of nitrogen mixed with the inert gas, or changing the inert gas filling pressure. This can be appropriately determined according to the rating and characteristics of the light bulb.

The type of the light bulb is not limited to the halogen light bulb for light projection in which the sealing portion is formed at one end of the bulb, but may be a light bulb in which only an inert gas containing no halogen is used for other purposes. The sealing parts may be provided at both ends of the valve. Further, the sealing portion is not limited to crush sealing, but may be a sealing portion formed by contracting a valve, and is not limited to a metal foil such as molybdenum foil, and a linear sealing member is used. Good.

The bulb shape is not limited to the illustrated tube shape, but may be a spherical shape, an elliptical shape, a teardrop shape, or the like, and the glass material of the bulb is not limited to quartz glass, and the required translucency and optical refractive index are obtained. Other hard or soft glass materials may be used as long as they have both heat resistance and heat resistance. Further, the visible light transmitting / infrared reflecting film is not limited to the outer surface of the bulb, but may be the inner surface of the bulb, or may be formed on at least one of the inner and outer surfaces.

Furthermore, in the above embodiment the titanium dioxide in the high refractive index layer film (TiO _2), was used a low refractive index layer film of silicon dioxide (TiO _2), as a high refractive index layer film is not limited thereto _{May be} tantalum pentoxide (Ta ₂ O ₅ ), zirconium dioxide (ZrO ₂ ), zinc dioxide (ZnO ₂ ), etc., and the low refractive index layer film may be magnesium fluoride (MgF) etc.

Furthermore, the light bulb with a reflecting mirror is not limited to one in which both are integrated with an adhesive, and the light bulb is attached to a reflecting mirror with a socket or a device in which the socket and the reflecting mirror are separate bodies. It does not matter if there is.

[0035]

As described in detail above, according to the present invention, the infrared rays reflected from the visible light transmitting infrared reflecting film are dispersed in any one of the plurality of single coil filaments arranged off the central axis of the bulb. The filament is a single-coil filament, with no hot spots at high temperature to prevent partial overheating, and there is no local evaporation of tungsten so that it does not break down early and does not break. Therefore, it is possible to support the middle portion with a large number of anchors, and it is possible to provide a light bulb that is strong against vibration and shock.

[Brief description of drawings]

FIG. 1 is a front view of a halogen bulb for floodlight showing an embodiment of the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is a front view showing a shaped state of a filament.

FIG. 4 is an enlarged perspective view of a mount.

FIG. 5 is an explanatory diagram when the arrangement of filaments is viewed from above.

FIG. 6 is a partially enlarged side sectional view of a glass bulb.

FIG. 7 is a partial cross-sectional front view of a halogen light bulb with a reflecting mirror showing an embodiment of the present invention.

FIG. 8 is a front view showing a shaped state of another filament of the present invention.

[Explanation of symbols]

 L: Light bulb RL: Light bulb with reflecting mirror 1: Glass bulb 1A: Bulb central axis 11, 12, 13: Anchor 2: Mount 20: Filament 21, 22, 23, 24: Single coil filament 3: Internal lead wire 8: Visible Light transmission infrared reflection film (red film) 90: Reflecting mirror

[Procedure amendment]

[Submission date] September 29, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction content]

[Document name] Statement

[Title of Invention] Light bulb and light bulb with reflector

[Claims]

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light bulb in which a multilayer bulb such as a visible light transmitting infrared reflecting film is formed on the surface of a glass bulb such as a halogen bulb.

[0002]

2. Description of the Related Art Various efforts have been made in the field of light bulbs as a part of energy saving. For example, in a halogen light bulb, a visible light transmitting infrared reflecting film is formed on the surface of a bulb so that the light is emitted from a coiled filament. It is known that infrared rays are reflected by this reflective film and returned to the coil-shaped filament, thereby heating the coil-shaped filament and increasing the luminous efficiency.

As the visible light transmitting infrared reflecting film, a high refractive index layer film made of titanium oxide (TiO ₂ ) and a low refractive index layer film made of silicon dioxide (SiO ₂ ) are alternately laminated to form a multilayer. By appropriately selecting the number of layers and the thickness of the layers, light interference is used to selectively transmit and reflect light in a desired wavelength range.

In this light bulb, the larger the number of layers of the film, the higher the reflectance of infrared rays and the greater the effect of power saving.

A filament of a light bulb having such a visible light transmitting / infrared reflecting film formed thereon has a double coiled filament arranged on the central axis of the bulb in order to concentrate the infrared rays reflected from the reflecting film on the filament. is doing.

[0006]

However, the double-coiled one has the advantage that the filament has a good heat-retaining effect and high efficiency, but its vibration resistance is extremely weak.
As a means for improving the vibration resistance, it may be possible to support the middle part of the filament with anchors, but the number of anchors cannot be increased because the coil length is short, and if there are anchors, the anchors short-circuit the coil pitches. In some cases, that part may not emit light.

Further, if the filament is located on the central axis of the bulb, the reflected infrared rays may concentrate and return to the central portion of the filament, which causes a hot spot at the central portion. The occurrence of this hot spot is that the central portion of the filament is overheated to a high temperature, so that the tungsten of this portion forming the filament is sputtered and becomes finer than the other portions, so that the wire may break early.

Therefore, according to the present invention, in a light bulb in which a visible light transmitting / infrared reflecting film is formed on a bulb, a double coil filament is arranged along the axis of the bulb. Because of the hot spots, multiple single coil filaments are placed side by side to combat vibrations and the reflected infrared radiation returns to one of the filaments to provide a long life bulb with no partial overheating of the filaments. The purpose is to

[0009]

According to the invention of claim 1, a glass bulb; a visible light transmitting infrared reflecting film formed on at least one of the inner and outer surfaces of the glass bulb;
The glass bulb includes a plurality of single-coil filaments extending in the axial direction of the bulb; and an inert gas sealed in the glass bulb.

Here, the plurality of single coil filaments are
It may be formed by bending a plurality of long single-coil filaments, or may be formed by connecting a plurality of short single-coil filaments.

According to the second aspect of the present invention, the plurality of single coil filaments are arranged at substantially equal distances from the central axis of the glass bulb.

According to the invention of claim 3, a glass bulb; a visible light transmitting infrared reflecting film formed on at least one of the inner and outer surfaces of the glass bulb; and a plurality of glass bulbs extending in the bulb axial direction of the glass bulb. A mount having an inner lead wire electrically connected to the single coil filament, an anchor supporting an intermediate portion of the filament, and a bead glass fixing the same; and a mount enclosed in the glass bulb. And an active gas.

Here, the plurality of single coil filaments are
It may be formed by bending a plurality of long single-coil filaments, or may be formed by connecting a plurality of short single-coil filaments.

According to a fourth aspect of the present invention, the distance between the plurality of single coil filaments becomes narrower toward the portion supported by the anchor.

According to a fifth aspect of the invention, the glass bulb is
It has a cylindrical shape.

According to the invention of claim 6, halogen is enclosed in the glass bulb.

The invention of claim 7 comprises the light bulb according to any one of claims 1 to 6; and a reflecting mirror in which the light bulb is disposed.

[0018]

According to the first aspect of the present invention, the use of the single coil filament increases the number of supporting points by the anchor and improves the vibration resistance, and the reflected infrared rays are returned to any one of the plurality of single coil filaments. Therefore, there is no decrease in efficiency and there is no risk of partial overheating of each single coil filament. Further, since light is emitted from the plurality of single coil filaments, soft irradiation light can be obtained.

According to the second aspect of the present invention, since the plurality of single coil filaments are arranged at substantially equal distances from the glass bulb center axis, there is no partial overheating of each single coil filament. Efficiently and uniformly heated.

The present invention of claim 3 is a mount comprising an internal lead wire electrically connected to a plurality of single-coil filaments, an anchor for supporting the middle of the filaments, and a bead glass for fixing these. By using, the visible light radiated from the front of the glass bulb is not blocked, so that the light can be efficiently radiated.

According to the invention of claim 4, the distance between the plurality of single coil filaments becomes narrower toward the portion supported by the anchor. Therefore, as compared with the invention of claim 3, Since the visible light emitted from the front of the glass bulb is not blocked, the light can be efficiently emitted.

According to a fifth aspect of the invention, the glass bulb is
It has a cylindrical shape and the infrared ray can be efficiently reflected in the direction of a plurality of single coil filaments by the visible light transmitting infrared ray reflecting film formed on the glass bulb.

According to the sixth aspect of the invention, halogen is enclosed in the glass bulb, and the life of the light bulb can be extended by the halogen cycle.

According to the invention of claim 7, the object to be irradiated can be efficiently irradiated.

[0025]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view of a halogen light bulb L for small light projection, FIG. 2 is a side view, FIG. 3 is a filament shaping view, FIG. 4 is an enlarged perspective view of a mount, and FIG. FIG. 6 is a partially enlarged side sectional view of the glass bulb.

In FIG. 1, reference numeral 1 denotes a cylindrical bulb made of quartz glass, in which a mount 2 described later and an inert gas such as argon containing halogen such as bromine or chlorine are enclosed. The mount 2 is held by sealing the molybdenum foils 4 and 4 connected to the lower ends of the inner lead wires 3 and 3 in a sealing portion 5 formed by crushing one end of the bulb 1. The crushable sealing portion 5 is housed in a ceramic holder 6a included in the metal die 6 and is joined and held by a silicon-based heat resistant adhesive (not shown) or the like. Further, although not shown, one end side of the external lead wire is connected to the other end side of each molybdenum foil 4, 4,
The other end of the external lead wire is connected to the terminal of the base 6.

Further, 7 is an exhaust pipe provided at the other end of the bulb 1, and 8 is a visible light transmitting infrared reflecting film (hereinafter, referred to as a "multilayer interference film") formed on the outer surface of the bulb 1.
It is called the red film. ).

As shown in the enlarged view of FIG. 3, the mount 2 has a bead glass 9 made of quartz glass or the like, and a pair of internal lead wires 3 and 3 and an anchor 1 made of, for example, molybdenum.
1, 12 and 13 are planted and a filament 20 is connected between the internal lead wires 3 and 3.

This filament 20 is shaped as shown in FIG. That is, the single-coil filaments 21, 22, 2 forming the light-emitting portion, which is roughly divided into four, are
Locking coil portions 26, 26 are formed at the portions having the coil portions 3, 24, which are connected to the single coil filaments 21, 24, through skip winding portions 25, 25 obtained by extending a coiled portion. In addition, the coil of the shaped corner portion is slightly stretched.

As shown in the enlarged view of FIG. 4, the filament 20 is inserted into the bent tip portions 3a, 3a of the inner lead wires 3, 3 by inserting the locking coil portions 26, 26 at both ends into a single coil filament. The distal end portion 11a of the bent anchor 11 is inserted through the intermediate portion 27 of 21, 21 and the distal end portion 13a of the bent anchor 13 is inserted through the intermediate portion 28 of the single coil filaments 22, 23. The anchor 12 is bent in the middle portion 29 of 24.
The single coil filaments 21, 22, 23, 24 interposed in the insertion portions are short-circuited.

The single coil filaments 21, 22, 23, 24 of this filament 20 extend in the valve axial direction, and as shown in FIG.
1, 22, 23, 24 are substantially concentric circles with respect to the valve center axis 1
It is at a position of substantially equal distance R on B.

Further, as shown in FIG. 6, on the outer surface of the glass bulb 1, for example, TiO2 forming the high refractive index layer films 8H, ... and SiO2 forming the low refractive index layer films 8L ,.
The visible light transmitting / infrared reflecting film 8 is formed by alternately repeating the above and laminating a predetermined number of layers, and depositing them by means such as vapor deposition and dipping.

When the light bulb L having such a structure is turned on, the bulbs 4 are arranged concentrically around the central axis 1A of the bulb 1.
Of the light emitted from the single-coil filaments 21, 22, 23, 24 of the book, visible light passes through the bulb 1 and the red anti-reflector membrane 8 and is emitted to the outside of the bulb 1. Further, the infrared rays emitted from these single coil filaments 21, 22, 23, 24 are reflected by the red anti-reflective film 8 formed on the surface of the bulb 1 having a circular cross section and return to the vicinity of the central axis 1A of the bulb 1. .

Originally, the filament is not located on the central axis 1A of the bulb 1, but the infrared rays are not located on the central axis 1A.
The four single coil filaments 21, 22, 23, and 24 arranged in close proximity to each other to return.
Further, the infrared rays that have passed through the single coil filaments 21, 22, 23, 24 are repeatedly reflected by the red anti-reflection film 8 again, and finally enter the single coil filaments 21, 22, 23, 24. The temperature of these single coil filaments 21, 22, 23, 24 can be further raised to increase the luminous efficiency.

Therefore, the infrared rays reflected from the red film 8 are dispersed and returned to the four single coil filaments 21, 22, 23 and 24 near the central axis 1A of the bulb 1 to generate a hot spot due to filament overheating. It is also possible to prevent the filament material tungsten from evaporating locally and prevent the filament material from being thinned and broken at an early stage, so that the bulb L having a long life can be provided. Further, since a large number of anchors supporting filaments can be used, a light bulb L having improved strength against vibration and shock can be obtained.

Furthermore, by using a mount having an inner lead wire electrically connected to a plurality of single coil filaments, an anchor for supporting the middle of the filament, and a bead glass for fixing these, ,
Since the visible light emitted from the front of the glass bulb is not blocked, it can be efficiently irradiated. Furthermore, since light is emitted from the plurality of single coil filaments, soft irradiation light can be obtained.

Existing floodlight halogen bulb JD110V8
Except for the 5W and the mount, the other parts manufactured with the same size and the same material showed almost no change in various characteristics in the static test, and were able to obtain a marked strength in the vibration test.

The glass bulb length is about 45 m.
m, valve internal space length approx. 25 mm, valve outer diameter approx. 11
mm, valve inner diameter about 8.5-9 mm, single coil filament length about 10 mm, single coil filament strand diameter about 0.07 mm, single coil filament inner diameter about 0.35
mm, concentric circle diameter (2R) with 4 single coil filaments arranged about 4 mm, enclosed inert gas Ar 90% + N1
0% is about 2300 torr (about 3 atmospheres).

FIG. 7 shows another embodiment of the present invention.
FIG. 7 shows a halogen light bulb RL integrated with a reflecting mirror. Since the light bulb L has the same shape as that of FIGS. 1 to 6 (however, there is no base), the same parts as those of FIGS. The description thereof will be omitted.

In the figure, 90 is a reflecting mirror having a reflecting surface in the shape of a paraboloid of revolution, a spheroid, etc. formed of hard glass, heat-resistant synthetic resin or metal, and the inner surface is made of aluminum, chrome or silver. A visible / light-reflecting infrared ray transmitting film 91 such as a light / heat reflecting film or a dichroic film is formed, and a central portion of the base portion 92 has a recess 93 for accommodating the crushable sealing portion 5 of the light bulb L. is doing. Then, a heat-resistant adhesive 94 such as a silicon-based adhesive is injected in a state where the collapsed sealing portion 5 of the light bulb L is placed in the recess 93, and when the focusing of the position of the filament 20 with respect to the reflecting surface 11 is completed, this adhesive 94 is solidified and both are integrated.

The light bulb RL with a reflecting mirror shown in FIG.
Since the bulb L itself has a long life and improved characteristics such as vibration resistance, good characteristics can be obtained.

The present invention is not limited to the above embodiment. For example, the filament forming the mount has been described as having four single coil filaments.
The number of books is not limited to two, and may be two or more. Further, the extending direction of the single coil filament is preferably parallel to the valve axis, but as shown in FIG. 8, it may be slightly inclined with respect to the central axis 1A, and it is arranged as close as possible. Is good. Therefore, the distance between the plurality of single coil filaments becomes narrower toward the portion supported by the anchor, and further, the visible light emitted from the front of the glass bulb is not blocked, so that the efficiency is improved. Can be irradiated.

Further, the end portion or the intermediate portion of the filament supported on the lead wire or the anchor may be a coiled portion or a skip winding portion 25 obtained by extending the coiled portion,
The filament may not be preshaped.

If the plurality of single-coil filaments arranged at substantially equal distances are close to each other, arc discharge may occur between the single-coil filaments or between the lead wires. Can be dealt with by increasing the distance, increasing the amount of nitrogen mixed with the inert gas, or changing the inert gas filling pressure. This can be appropriately determined according to the rating and characteristics of the light bulb.

The type of the light bulb is not limited to the halogen light bulb for light projection in which the sealing portion is formed at one end of the bulb, but may be other usage or a light bulb in which only an inert gas containing no halogen is enclosed. The sealing parts may be provided at both ends of the valve. Further, the sealing portion is not limited to crush sealing, but may be a sealing portion formed by contracting a valve, and is not limited to a metal foil such as molybdenum foil, and a linear sealing member is used. Good.

The bulb shape is not limited to the illustrated tube shape, but may be a spherical shape, an elliptical shape, a teardrop shape, or the like, and the glass material of the bulb is not limited to quartz glass, and the required translucency and optical refractive index are obtained. Other hard or soft glass materials may be used as long as they have both heat resistance and heat resistance. Further, the visible light transmitting / infrared reflecting film is not limited to the outer surface of the bulb, but may be the inner surface of the bulb, or may be formed on at least one of the inner and outer surfaces.

[0047] Further, in the above embodiment the titanium dioxide in the high refractive index layer film (TiO _2), was used a low refractive index layer film of silicon dioxide (TiO _2), as a high refractive index layer film is not limited thereto _{May be} tantalum pentoxide (Ta ₂ O ₅ ), zirconium dioxide (ZrO ₂ ), zinc dioxide (ZnO ₂ ), etc., and the low refractive index layer film may be magnesium fluoride (MgF) etc.

Furthermore, the light bulb with a reflecting mirror is not limited to one in which both are integrated with an adhesive, and the light bulb is attached to a reflecting mirror with a socket or a device in which the socket and the reflecting mirror are separate bodies. It does not matter if there is.

[0049]

According to the invention of claim 1, since the single coil filament is used, the number of supporting points by the anchor is increased and the vibration resistance is improved, and the single coil filament having a plurality of reflected infrared rays is used. Since it returns, there is no reduction in efficiency and there is no risk of partial overheating of each single coil filament. Further, since light is emitted from the plurality of single coil filaments, soft irradiation light can be obtained.

According to the second aspect of the present invention, since the plurality of single coil filaments are arranged at a substantially equal distance from the center axis of the glass bulb, there is no partial overheating of each single coil filament. Efficiently and uniformly heated.

A third aspect of the present invention is a mount comprising an inner lead wire electrically connected to a plurality of single-coil filaments, an anchor for supporting the middle of the filaments, and a bead glass for fixing these. By using, the visible light radiated from the front of the glass bulb is not blocked, so that the light can be efficiently radiated.

According to the invention of claim 4, the distance between the plurality of single coil filaments becomes narrower toward the portion supported by the anchor. Therefore, as compared with the invention of claim 3, Since the visible light emitted from the front of the glass bulb is not blocked, the light can be efficiently emitted.

According to a fifth aspect of the invention, the glass bulb is
It has a cylindrical shape and the infrared ray can be efficiently reflected in the direction of a plurality of single coil filaments by the visible light transmitting infrared ray reflecting film formed on the glass bulb.

According to the sixth aspect of the invention, halogen is enclosed in the glass bulb, and the halogen cycle can prolong the life of the light bulb.

According to the invention of claim 7, the object to be irradiated can be efficiently irradiated.

[Brief description of drawings]

FIG. 1 is a front view of a halogen bulb for floodlight showing an embodiment of the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is a front view showing a shaped state of a filament.

FIG. 4 is an enlarged perspective view of a mount.

FIG. 5 is an explanatory diagram when the arrangement of filaments is viewed from above.

FIG. 6 is a partially enlarged side sectional view of a glass bulb.

FIG. 7 is a partial cross-sectional front view of a halogen light bulb with a reflecting mirror showing an embodiment of the present invention.

FIG. 8 is a front view showing a shaped state of another filament of the present invention.

[Explanation of Codes] L: Light Bulb RL: Light Bulb with Reflecting Mirror 1: Glass Bulb 1A: Bulb Central Axis 11, 12, 13: Anchor 2: Mount 20: Filament 21, 22, 23, 24: Single Coil Filament 3: Internal Lead wire 8: Visible light transmitting infrared reflecting film (red anti-reflection film) 90: Reflecting mirror

Claims (4)

[Claims] 1. A glass bulb, a visible light transmitting / infrared reflecting film formed on at least one of the inner and outer surfaces of the glass bulb, and extending in the bulb axial direction within the bulb and with respect to the bulb central axis. An electric bulb comprising a plurality of single coil filaments arranged at substantially equal distances and an inert gas sealed in the bulb. 2. A bulb in a portion corresponding to a plurality of single coil filaments extending in the bulb axis direction has a cylindrical shape, and a visible light transmitting infrared reflecting film is formed on a surface of the bulb. The listed light bulb. 3. A halogen gas is enclosed together with an inert gas in the bulb.
A light bulb according to claim 2. 4. The above-mentioned claim 1 to claim 3 in a reflecting mirror.
A light bulb with a reflector, characterized in that the light bulb described in (4) is attached.