JPH1074407A - Lighting fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting fixture capable of satisfying light quantity and brightness, and also light color. SOLUTION: An interfering filter 9, for spectrally separating and transmitting light emitted by a filament, is provided on the lens surface of a shield beam type halogen lamp wherein a filament 5 is arranged in a lamp chamber into which a lamp body 1 and a front surface lens 2 are sealed. The interfering filter is set so that thin coats 10 and 11 of TiO2 and SiO2 can be laminated in alternate and multilayer, also the color temperature of transmitted light can be made about 5000K. A lighting fixture can be obtained which is less in the lowering of light quantity, miniature, and high in light quantity and brightness, compared with a lighting fixture using a colored filter, and moreover high in heat resistance, difficult in suffering damage due to heat, and long in a life, compared with the colored filter.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lamp used for various kinds of lighting, and more particularly to a lamp capable of obtaining a high light quantity, a high luminance and a required color light.

[0002]

2. Description of the Related Art For example, a shield beam type halogen lamp is used as a lamp for lighting a large room or outdoors. In recent years, in this type of illumination, color light close to daylight has been desired.
A lamp having a color temperature of about 0K is used. However, not only the above-described halogen lamp but also a lamp using an incandescent bulb as a light source has a color temperature of about 3000 K. Therefore, although the required light amount is satisfied, a problem occurs in terms of color light. Become. Conventionally, in order to solve the problem of the color light, a color filter is attached to the lamp, and of the light before or after the light is emitted from the lamp, the light on the long wavelength side is limited by the filter to perform color temperature conversion. A color light of about 5000K has been proposed.

[0003]

However, in this technique, since the color light is adjusted by the color filter, the transmittance of the color light on the long wavelength side, that is, the red side is reduced, and the light is emitted from the lamp accordingly. The amount of light is reduced. Therefore, although the required brightness is satisfied, the effective utilization rate of the lamp light amount is reduced,
In order to satisfy the above-mentioned light quantity, it is necessary to increase the size of the lamp. As described above, when the size of the lamp is increased, the calorific value of the lamp is exponentially increased. Usually, most of such colored filters are formed by coating a colored resin film on glass or transparent resin. When the color filter is damaged by the heat of the color filter, the spectral characteristic of the colored resin film is changed when the color filter is damaged, so that a desired color light cannot be obtained.

[0004] It is an object of the present invention to provide a lamp capable of satisfying both color light and light intensity and luminance.

[0005]

SUMMARY OF THE INVENTION The present invention provides a light source, a reflecting surface for reflecting light from the light source, and a lens for transmitting the light from the light source and the light reflected by the reflecting surface and emitting the light to the outside. In the lamp provided, the outgoing light is 5 on the optical path of this light.
An interference filter set so as to provide color light of about 000K is arranged. This interference filter is formed on the lens surface or on the reflection surface. Further, it is preferable that the interference filter has a structure in which TiO ₂ and SiO ₂ thin films are alternately stacked in multiple layers. Further, it is preferable that a texture is formed on the lens.

[0006]

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view of an embodiment in which the present invention is applied to a shield beam type halogen lamp. A lamp body 1 and a front lens 2 made of heat-resistant glass are integrally welded to define a lamp chamber 3, and a halogen bulb 5 is disposed inside the lamp chamber 3. In the halogen bulb 5, an inert gas is sealed in a cylindrical glass arc tube 5a, and a filament 5c is provided between a pair of lead wires 5b inserted from both ends thereof. An insulating ferrule 4 is provided at a central position on the rear surface of the lamp body 1. A support wire 6 serving as a lead wire communicating with the lamp chamber 3 is provided on the ferrule 4. The lead wire 5b of the halogen lamp 5 is connected to the inner end of the lamp to supply power. Further, a metal is coated on the inner surface of the lamp body 1 to form a reflection film 7. The lamp body 1
Is designed to have an arbitrary curved surface shape according to the light distribution characteristics required of the lamp. On the inner surface of the front lens 2, a grain 8 having irregular fine irregularities is formed by, for example, shot peening, and an interference filter 9 is formed integrally on the inner surface.

The interference filter 9 is made of a transparent material having a different refractive index, in this case, each of thin films 10, 1 of TiO ₂ and SiO _2.
By alternately laminating 1, the emission of required color light is suppressed by interference when light passes through these thin films 10 and 11. By laminating the thin films 10 and 11 having different thicknesses in multiple layers, a filter having required spectral characteristics by integrating the emission of color light from each thin film is formed. Here, four layers are formed, and the first
The TiO ₂ in the thickness of the layer th x, the second layer of SiO ₂ of 2y film thickness, and the thickness of the third layer x, the thickness of the fourth layer and 3y. However, when x> y and there are six or more layers, they are formed so as to have the same relationship. Normal,
These thin films are formed by a vapor deposition method, a sputtering method, or the like. In this embodiment, the spectral characteristic of the interference filter 9 is formed such that light transmission of about 700 nm is suppressed and the transmittance has a maximum peak at 450 nm, as shown by the solid line in FIG. .

Therefore, when power is supplied to this lamp to cause the halogen bulb 5 to emit light, the emitted light is directly
Alternatively, after being reflected by the reflection surface 7, the light is transmitted through the front lens 2 and emitted. At this time, the spectral characteristic of the emitted light is such that the light level is gradually increased from the short wavelength side to the long wavelength side as shown in FIG.
It is about 00K. When the color light passes through the front lens 2, it passes through the interference filter 9 having the spectral transmittance characteristic indicated by the solid line in FIG. It becomes like the solid line of 2 (c). According to this spectral characteristic, the color temperature is 5000K
Before and after, it functions as a lamp of color light close to the desired daylight color. In this case, since the transmission of the color light is restricted by the interference filter 9, the decrease in the light amount is suppressed to a minimum, and the emitted light with high luminance can be obtained.

In the case of a lamp in which a conventional blue color filter as shown by a chain line in FIG. 2A is arranged in front of a shield beam type halogen lamp, the spectral characteristic of light transmitted through the color filter is considered. Is shown by a chain line in FIG. 2 (c), and when the color filter is configured so that the color temperature becomes 5000 K, the light is emitted from the color filter when the brightness of the halogen lamp is 200,000 candela. The brightness of the light is 40,000 candela, which is reduced to 25%. On the other hand, in the lamp of the present embodiment shown in FIG. 1, the brightness of the light emitted from the lamp is 100,000 candela, while the brightness of the halogen lamp is 200,000 candela, and the brightness is 50%. It is clear that can be secured.

As described above, in the lamp according to the present embodiment, since the colored filter is not used, a decrease in the amount of light of the lamp can be suppressed. Therefore, it is not necessary to increase the size of the lamp, and a high-intensity and small-sized lamp can be configured. . In addition, since the interference filter has high heat resistance, the interference filter is less likely to be damaged by heat than a colored filter, and a long-life lamp can be configured. Further, since the grain 8 is formed on the inner surface of the front lens, the filament 5 and the like inside the lamp are not exposed from the outside through the front lens 2 and the appearance is good. An effect of diffusing the emitted light by the grain can be expected, and it is also possible to obtain uniform light distribution characteristics. Further, since the interface is activated when the interference filter 9 is formed by vapor deposition due to the unevenness of the grain 8, the adhesive force is increased, and the thin film 1 forming the interference filter 9 is formed.
This improves the adhesion between the interference filter 9 and 0 and 11 and is effective in preventing the separation of the interference filter 9. Furthermore, when a lighting device is configured using this lamp, it is not necessary to arrange a colored filter in front of the lamp, so that the number of components of the lighting device can be reduced, and it is also effective in making the lighting device compact. is there.

FIG. 3 is a sectional view of a second embodiment of the present invention, in which the present invention is applied to a shield beam type halogen lamp as in the first embodiment. Note that parts equivalent to those in the first embodiment are denoted by the same reference numerals. In this embodiment, an interference filter 9A is formed on the inner surface of the lamp body 1 made of transparent glass instead of the reflection film. In addition, a grain is formed on the inner surface of the front lens 2 as in the above embodiment, but no interference filter is formed. Here, the interference filter has a characteristic opposite to the spectral characteristic shown by the solid line in FIG. It is configured so as to have characteristics almost similar to the above. That is, 700 nm
, The transmittance is maximized, and the transmittance is minimized near 450 nm, that is, the reflectance is maximized. However,
Actually, it is designed so that the reflectance on the long wavelength side becomes lower than this.

In the lamp having this configuration, a part of the light emitted by the filament 5 is emitted through the front lens 2 as it is. Another part is projected on the interference filter 9A of the lamp body 1, where a part is transmitted and a part is reflected. Then, the reflected light becomes color light having a spectral characteristic according to the above-mentioned reflection characteristic of the interference filter 9A, and is emitted through the front lens 2. Therefore,
As for the lamp as a whole, the light directly transmitted through the front lens 2 and the light reflected by the interference filter 9A are mixed and emitted. Since the reflection characteristic of the interference filter 9A reduces the reflectance on the long wavelength side as described above, the result of mixing with the light from the filament 5 in the front lens 2 is almost the same as in the first embodiment. It becomes color light having spectral characteristics, and as a result, becomes daylight light having a color temperature of about 500K.

Also in this embodiment, since the reflection efficiency of the interference filter 9A in the specific wavelength region is higher than that of the color filter, the reduction of the brightness of the light emitted from the lamp is small, and the interference filter 9A is small and has high brightness. Lamp is obtained.
Needless to say, the appearance of the front lens is improved by the graining of the front lens, and uniform light distribution characteristics are obtained.
Further, in this embodiment, a part of the light of the lamp is transmitted to the rear side of the lamp body, so that it is effective when there is nothing reflecting the light behind the lamp. Further, since the amount of reflected light to the front lens side is reduced by this transmission, the luminance is somewhat reduced as compared with the first embodiment.

FIG. 4 is a sectional view of a third embodiment of the present invention, in which an interference filter 9B is disposed in front of a conventionally provided shield beam type halogen lamp. This interference filter 9B is formed by laminating TiO ₂ and SiO ₂ thin films on the surface of the transparent glass substrate 12 in a multi-layered manner as described above so that the spectral transmittance is as shown in FIG. In this embodiment, since the light emitted from the lamp is transmitted through the interference filter 9A, it becomes color light having spectral characteristics as shown in FIG.
A desired color light of about 5000K can be obtained. Also, the amount of light at that time is the same as in the first embodiment, and a decrease in the amount of light is suppressed.

In this embodiment, an interference filter is provided separately from the lamp.
The lighting device will be somewhat larger than in the first embodiment. However, since the interference filter can be exchanged, a plurality of interference filters having different spectral characteristics are prepared, and an arbitrary interference filter is selected and used to illuminate any color light without exchanging a lamp. Can be realized.

In the present invention, although not shown in the drawings, in the third embodiment, an interference filter is formed by forming a thin film in multiple layers on the surface of a flexible heat-resistant transparent film. A suitable interference filter may be attached to the outer surface of the front lens of the halogen lamp. In this way, the number of components when configuring the illumination device can be reduced and the size of the device can be reduced, while the illumination device of any color light can be configured by replacing the interference filter.

In each of the above embodiments, an example in which the present invention is applied to a shield beam type halogen lamp as a lamp is shown. However, a lamp using an incandescent bulb as a light source, a lamp using a discharge tube as a light source, and the like. Alternatively, the present invention can be applied to a lamp whose lens is detachable from the lamp body. In the lamp in which the lens is detachable, even if the interference filter is integrated with the lens as in the first embodiment, it is possible to obtain a lamp of any color light by exchanging the lens. Also, the transparent material constituting the interference filter is:
The present invention is not limited to the above.
Using Ta ₂ O ₅ in place of O _2, etc. using a MgF ₂ instead of SiO _2, various ones may be employed. In this case, it is preferable to use one having excellent heat resistance and abrasion resistance in order to extend the life.

[0018]

As described above, according to the present invention, an interference filter is disposed on an optical path in which a light source is reflected by a reflection surface and passes through a lens and is emitted, and light is transmitted or reflected by the interference filter. Since it is configured as a lamp that emits color light with a color temperature of about 5000K, the reduction in the amount of light is smaller than that using a colored filter, and a compact, high-light, high-luminance lamp can be obtained. And heat resistance is higher than colored filters.
A lamp which is not easily damaged by heat and has a long life can be obtained. In particular, by setting the color temperature of the color light to about 5000 K, it can be configured as a lamp that emits daylight color light, and can be suitably used as an indoor or outdoor lighting device. Also, by providing the lens surface with a texture, the appearance can be improved, and the light can be diffused to perform uniform illumination, and the reliability of the interference filter can be improved by increasing the adhesion of the interference filter.

[Brief description of the drawings]

FIG. 1 is a sectional view of a first embodiment of a lamp according to the present invention.

FIG. 2 is a diagram showing a spectral transmittance of an interference filter according to the lamp of the present invention, a spectral characteristic of emitted light, and a spectral characteristic of light emitted from a lamp in comparison with a colored filter.

FIG. 3 is a sectional view of a second embodiment of the present invention.

FIG. 4 is a sectional view of a third embodiment of the present invention.

[Explanation of symbols]

1 lamp body 2 front lens 4 ferrule 5 filament 6 supported beam 7 reflecting film 8 grain 9, 9A, 9B interference filter 10 TiO ₂ thin film 11 SiO ₂ thin film 12 transparent glass substrate

Claims (5)

[Claims] 1. A lamp comprising: a light source; a reflecting surface that reflects light from the light source; and a lens that transmits the light from the light source and the light reflected by the reflecting surface and emits the light to the outside. The color temperature of outgoing light is 5000K on the optical path of
A lamp having an interference filter having a spectral characteristic set to about 5500K. 2. The lamp according to claim 1, wherein the interference filter is formed on the lens surface. 3. The lamp according to claim 1, wherein the interference filter is formed on the reflection surface. 4. The lamp according to claim 1, wherein the interference filter has a structure in which TiO ₂ and SiO ₂ thin films are laminated in multiple layers. 5. The lamp according to claim 1, wherein the lens is formed with a grain.