JP2000285727A - High-pressure discharge lamp device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high-pressure discharge lamp device suppressing the excessive heat quantity to a lighting circuit arranged on the back face side of a reflector and capable of being miniaturized. SOLUTION: This high-pressure discharge lamp device is provided with a high-pressure discharge lamp 1, having a translucent airtight container containing seal sections formed at least at one end, electrodes supported on the seal sections and arranged inside and a discharge medium sealed inside and external leads electrically connected to the electrodes at one end and guided to the outside from the end sections of the seal sections at the other end, a reflector 2 formed with reflecting films mainly reflecting visible light and infrared rays on an opening section, a curved surface section, a bottom section and the back face side and arranged to optically face the high-pressure discharge lamp 1, a cover body 3 covering the opening section of the reflector 2, a lighting circuit 4 arranged on the back face side of the reflector 2 to light the high-pressure discharge lamp 1, and a case 5 storing the high-pressure discharge lamp 1, the reflector 2 and the lighting circuit 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a high-pressure discharge lamp device.

[0002]

2. Description of the Related Art In recent years, a high-pressure discharge lamp device has been developed in which a high-pressure discharge lamp and a reflector are integrated, and the illuminance is increased by arranging the high-pressure discharge lamp parallel to an opening surface of the reflector. . In such a high-pressure discharge lamp device, the luminous efficiency of the high-pressure discharge lamp is high, and the power consumption can be reduced as compared with a lamp device using a halogen lamp or a fluorescent lamp.

[0003]

This type of high-pressure discharge lamp apparatus can be miniaturized because light is obtained by discharge in an extremely small gap between electrodes. The heat load is large and poses a problem when miniaturized.

That is, as the size of the device is reduced, the radiation from the light emitting section becomes stronger, and the radiation from the reflector to the rear side becomes stronger. Therefore, the lighting circuit disposed on the rear side of the reflector operates normally. May not.

When the opening of the reflector is covered with a translucent cover or the like, the space surrounded by the reflector and the translucent cover becomes hot. By arranging the high-pressure discharge lamp in the space where the temperature is high, the lighting state of the high-pressure discharge lamp becomes unstable due to the influence of heat, and the life may be shortened.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a high-pressure discharge lamp device capable of suppressing an excessive amount of heat to a lighting circuit disposed on the back side of a reflector and reducing the size.

[0007]

Means for Solving the Problems The invention according to claim 1 includes a sealing portion formed at at least one end, an electrode supported by the sealing portion and disposed inside, and a discharge medium sealed inside. A high-pressure discharge lamp having a translucent airtight container constituted by: and an external lead having one end electrically connected to the electrode and the other end led out from the end of the sealing portion; A reflector having a reflective coating formed mainly on the base, bottom and back side for reflecting visible light and infrared light, wherein the high-pressure discharge lamp is disposed optically facing; and an opening of the reflector A lighting circuit for lighting the high-pressure discharge lamp provided on the back side of the reflector; and a case for accommodating the high-pressure discharge lamp, the reflector and the lighting circuit.

According to a second aspect of the present invention, there is provided a light transmitting apparatus including a sealing portion formed at at least one end, an electrode supported by the sealing portion and disposed inside, and a discharge medium sealed inside. A high-pressure discharge lamp having an airtight container and one end electrically connected to the electrode, and the other end externally led out from the end of the sealing portion; and an opening, a curved surface, and a bottom. A reflector having a ceramic base and a reflective coating formed on the surface of the base and mainly reflecting visible light, wherein the high-pressure discharge lamp is disposed optically facing; And a lighting circuit for lighting the high-pressure discharge lamp disposed on the back side of the reflector; and a case accommodating the high-pressure discharge lamp, the reflector and the lighting circuit.

Regarding each term in the present invention described above,
Next, a description will be given. First, the translucent airtight container is formed of a material having translucency and heat resistance, for example, translucent ceramics or quartz glass.

As the discharge medium sealed in the translucent airtight container, a rare gas such as xenon or argon, a metal halide, mercury or the like is used.

The external lead and the electrode may be formed separately and fixed, or may be formed integrally.

The reflective film that mainly reflects visible light and infrared light may be any as long as it reflects visible light and infrared light emitted from the high-pressure discharge lamp in the projection direction.
The film thickness may be relatively thick and may be plate-shaped. This allows
It is possible to suppress infrared rays from passing through the reflector and reaching the lighting circuit. Therefore, each of the high-pressure discharge lamp, the reflector, and the lighting circuit can be disposed relatively close to each other, and the entire device can be downsized.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A high-pressure discharge lamp device according to an embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a vertical sectional front view of a high-pressure discharge lamp device according to an embodiment of the present invention, and FIG. 2 is a front view similarly showing an enlarged view of the high-pressure discharge lamp.

The high-pressure discharge lamp device includes a high-pressure discharge lamp 1, a reflector 2 on which the high-pressure discharge lamp 1 is disposed, a cover 3 disposed in front of the reflector, and a rear side of the reflector 2. The lighting circuit 4 includes a lighting circuit 4 and a case 5 for housing the lighting circuit 4.

First, the high-pressure discharge lamp 1 includes sealing portions 1aa, 1aa, and sealing portions 1aa, 1aa formed at at least one end.
Electrodes 1ab, 1a supported by 1aa and arranged inside
b and a light-transmitting airtight container 1a including a discharge medium sealed therein and one end of the electrode 1ab, 1a
b and the other end is connected to the sealing portions 1aa, 1aa.
Has external leads 1b, 1b extending outward from the ends of the external leads 1b.

The light-transmitting airtight container 1a is formed of a light-transmitting ceramic into a hollow spheroidal shape, and sealing portions 1aa, 1a formed in a cylindrical shape from both ends in the longitudinal direction.
a has been extended. External leads 1b, 1b are inserted into the sealing portions 1aa, 1aa, and electrodes 1ab, 1b are connected to one ends of the external leads 1b, 1b protruding into the translucent airtight container 1a.
The abs are integrally formed, and the other ends of the external leads 1b, 1b protrude outward from the ends of the sealing portions 1aa, 1aa.

At the ends of the sealing portions 1aa, 1aa, the space between the inner peripheral surface and the outer peripheral surfaces of the external leads 1b, 1b is sealed by seals 1c, 1c.

Next, the reflector 2 has an opening 2a, a curved surface 2
b, a bottom surface 2c and a reflective coating 2d formed on the back side for mainly reflecting visible light and infrared light, and the high-pressure discharge lamp 1 is disposed to be optically opposed. The reflector 2 is formed of a glass substrate, has a reflective coating 2d that mainly reflects visible light and infrared light, and is fixed to the case 5.

The reflection coating 2d mainly reflecting visible light and infrared light is formed by alternately stacking metal oxide films such as titanium oxide and silicon oxide.
It reflects visible light and infrared light in the projection direction.

That is, the visible light of the radiation from the high-pressure discharge lamp 1 is reflected by the reflection coating 2d of the reflector 2, and the light distribution according to the mirror shape is obtained. Other wavelength ranges such as infrared rays are diffusely reflected by the reflectance of the ceramic itself constituting the reflector 2.

Therefore, visible light for obtaining a predetermined light distribution can be appropriately reflected, and the lighting circuit 4
The radiation to the side can be reduced, and the malfunction or breakage of the circuit due to excessive temperature rise can be prevented.

Also, even if the surface of the reflective coating 2d formed on the back side of the reflector 2 is altered, the light from the high-pressure discharge lamp 1 passes through the glass substrate and the titanium oxide and the silicon oxide are laminated. As a result, the light reaches the metal oxide film formed as described above, and the reflected light is obtained by the light interference effect occurring in the film, so that it is hardly affected by the altered state of the outer surface of the reflective coating 2d, and the original function of the reflective coating 2d is deteriorated. There are few things.

When an aluminum vapor-deposited film is used as the reflection film 2d, the surface of the reflection film 2d formed on the back side of the reflector 2 is oxidized and the reflectance is lowered. However, since this surface is not a reflection surface, There is no effect on the light projection direction, and high reflectance can be maintained. When the reflective coating 2d is made of an aluminum reflector, the average temperature inside the case is 100 ° C., which is about 10% lower than the average temperature 111 ° C. without the reflector. Was completed.

Further, by returning heat to the high-pressure discharge lamp 1 side, the high-pressure discharge lamp 1 can be maintained at a high temperature, so that the luminous efficiency can be improved.

The reflector 2 may include a ceramic base and a reflective coating 2d formed on the surface of the base and mainly reflecting visible light. That is, the visible light of the radiation from the high-pressure discharge lamp 1 is reflected by the reflective coating 2d of the reflector 2, and a light distribution according to the reflector shape is obtained. Other wavelength ranges, such as infrared,
Diffuse reflection can be performed by the reflectance of the ceramic itself constituting the reflector 2. In this case, since it is only necessary to design and manufacture the reflective coating 2d so as to mainly reflect visible light, the effect can be obtained relatively easily.

As described above, visible light and infrared light are reflected, and it is possible to prevent the infrared light from reaching the lighting circuit through the reflector 2. Therefore, each of the high-pressure discharge lamp 1, the reflector 2, and the lighting circuit 4 can be disposed relatively close to each other, and the entire device can be downsized.

The fixing of the reflector 2 and the high-pressure discharge lamp 1 is performed by sealing the sealing portions 1aa, 1a of the high-pressure discharge lamp 1.
By inserting a into the two mounting holes 2e, 2e, the reflector 2 is positioned parallel to the opening surface of the opening 2a. Thereby, the light distribution performance by the reflector 7 is improved. The two are fixed by filling the mounting holes 2e with the cement 2f. This cement 2f is
Since the reflectance is lower than the reflection surface of the reflector 2, the two mounting holes 2e, 2e are formed to have the minimum hole diameter required for mounting the high-pressure discharge lamp 1. Therefore, when the high pressure discharge lamp 1 is fixed by filling the mounting holes 2e, 2e into which the sealing portions 1aa, 1aa of the high pressure discharge lamp 1 are inserted with the cement 2f, the exposed area of the cement 2f on the reflecting surface is a necessary minimum. And the deterioration of the reflection performance can be suppressed.

Further, the case 5 includes the high-pressure discharge lamp 1,
The reflector 2 and the lighting circuit 4 disposed on the back side of the reflector 2 are accommodated therein.

The case 5 includes an upper case 5a and a lower case 5b. Both are connected by a pin 5c, and the case 5a is provided rotatably about the pin 5c. Further, since the other ends of the external leads 1b, 1b protruding from the ends of the sealing portions 1aa, 1aa are located within the projection plane of the outer peripheral edge of the opening 2a, the outer dimensions of the upper case 5a are adjusted to the opening of the reflector 2. The diameter can be suppressed to approximately the same as the outer peripheral diameter of the portion 2a, and the high-pressure discharge lamp device can be downsized. Lead wires 1d, 1b are connected to the other ends of the external leads 1b, 1b projecting from the ends of the sealing portions 1aa, 1aa.
d is connected, but since the connection is covered by the upper case 5a, the external leads 1b, 1b and the lead wires 1d,
The connection with 1d can be reliably protected.

Further, in this device, the base 6 attached to the high-pressure discharge lamp device can be used by inserting it into an existing lamp socket, and a highly versatile lighting device can be obtained.

[0032]

According to the high pressure discharge lamp device of the first and second aspects, the high pressure discharge lamp device can be downsized without changing the size of the high pressure discharge lamp. Further, since the heat of the high-pressure discharge lamp is reflected by the reflector, the influence of the heat on the lighting circuit can be reduced, and the lighting state of the high-pressure discharge lamp can be stabilized.

[Brief description of the drawings]

FIG. 1 is a vertical sectional front view of a high-pressure discharge lamp device according to an embodiment of the present invention.

FIG. 2 is an enlarged front view of the high-pressure discharge lamp.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... High-pressure discharge lamp 2 ... Reflector 3 ... Cover body 4 ... Lighting circuit 5 ... Case

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Kiyoshi Otani F-term (reference) 3K014 AA01 LA01 LB05 in Toshiba Lighting & Technology Corporation 4-3-1 Higashishinagawa, Shinagawa-ku, Tokyo

Claims (2)

[Claims] 1. A translucent hermetic container including a sealing portion formed at least at one end, an electrode supported by the sealing portion and disposed inside, and a discharge medium sealed inside, and one end. A high-pressure discharge lamp having an external lead electrically connected to the electrode and having the other end led out from the end of the sealing portion; and a visible light formed on an opening, a curved surface, a bottom, and a back surface. A reflector having a reflective coating for mainly reflecting light and infrared light, wherein the high-pressure discharge lamp is disposed optically facing; a cover covering an opening of the reflector; a back side of the reflector A lighting circuit for lighting the high-pressure discharge lamp, and a case accommodating the high-pressure discharge lamp, the reflector, and the lighting circuit. 2. A translucent airtight container comprising at least one end formed with a sealing portion, an electrode supported by the sealing portion and disposed inside, and a discharge medium sealed inside, and one end. A high-pressure discharge lamp having an external lead electrically connected to the electrode and having the other end led out from the end of the sealing portion; a ceramic base comprising an opening, a curved surface, and a bottom; A reflector having a reflective coating formed mainly on the surface of the base and reflecting the visible light, wherein the high-pressure discharge lamp is disposed optically facing the cover; a cover covering an opening of the reflector; A high-pressure discharge lamp device comprising: a lighting circuit for lighting a high-pressure discharge lamp provided on the back side of a reflector; and a case for housing the high-pressure discharge lamp, the reflector, and the lighting circuit.