JPS6316542A - Discharge lamp with built-in reflector - Google Patents

Abstract

PURPOSE:To make such a reflector-built-in discharge lamp that is of high light- gathering efficiency, long service life, high light emitting efficiency and excellent in mass productivity securable, by setting up a light emitting tube in a closed space to be formed by a ceramic member having a reflector surface. CONSTITUTION:A light emitting tube 105 is set up in a closed space 104 to be formed by a ceramic member 101 having a reflector surface in the inner surface, and a lens surface is formed on a light incident surface of the ceramic member 101. And, the ceramic member 101 should be made of quarts glass and furthermore set down toa sol gel sintered body consisting of metallic alkoxide, fine powder silica or the like. With this constitution, a reflector is formed in the inside of the ceramic member 101 closing the light emitting tube 105 tightly. Accordingly, the degree of freedom for setting up a support material of the light emitting tube 105 is increased, whereby an invalid area of the reflector is held down to be smaller, thus high light-gathering efficiency is securable as well as improvement in service life and luminous efficiency are well promoted.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a novel configuration of a secondary discharge lamp incorporating a reflector.

[Conventional technology]

The reflector-built-in discharge lamps of the Company had a discharge space directly sealed with a reflector, as typified by the Thermax lamp manufactured by ILC (USA), in order to obtain high light condensing properties. FIG. 2 is a sectional view thereof.

201 is a reflector member, 202 is a discharge electrode, 203
is the discharge space. Furthermore, the discharge gas was limited to xenon.

[4 points for the invention to solve] However, conventional discharge lamps necessarily require a large discharge space, resulting in a decrease in efficiency due to uneven temperature distribution and a decrease in tube wall load. Although it is effective for lamps with high internal gas pressure, such as xenon lamps, it is more difficult to use for lamps than H, such as metal halide lamps. Furthermore, compared to the several thousand hours of life seen in lamps with a double-tube structure, the lifespan of this lamp is only about that long.

The present invention is intended to solve these problems, and its purpose is to provide a low-cost discharge lamp with a built-in reflector that has a long life, high luminous efficiency, and does not impair light collection efficiency. There it is.

[Means for solving problems]

The discharge lamp with a built-in reflector of the present invention has nine features in that the arc tube is installed in a sealed space formed by a ceramic member having a reflector surface on the inner surface. A further feature is that a lens surface is formed on the light exit surface of the ceramic member. In addition, the ceramic member is characterized by being made of quartz glass, and is also made of metal pulkoxide. The percentage mark is '1' indicating that the material is a sol-gel sintered body using a t-raw material such as imitation powder silica.

[Effect]

According to the above *g of the present invention, the reflector is formed inside the ceramic member that seals the arc tube. This increases the degree of freedom in arranging the support material for the arc tube, keeps the ineffective area of the reflector small, and provides high light collection efficiency.

Further, the arc tube is placed in the sealed space formed by this ceramic member, and the discharge space is doubly sealed from the outside air. This prevents the entry of ↓9 impure gases (mainly hydrogen), 1! Damaged poles, unstable discharge, enclosed v
Chemical changes in lJ quality can be suppressed, improving lifespan.

Furthermore, by completely confining the arc tube, the discharge space can be kept small, making it possible to use not only xenon lamps but also metal halide lamps. Not only can efficiency be improved, but an undesirable drop in temperature can be prevented and the entire arc tube can be maintained at a uniform temperature. Thereby, even more efficient light emission can be obtained.

Furthermore, by using low-expansion quartz glass for the ceramic member, a lamp with excellent heat resistance and generation of impurity gas can be suppressed.

By providing a lens surface to the ceramic member of the light emitting surface, the luminous flux intensity distribution can be further controlled and uniform illumination can be obtained.

Further, since the ceramic member is manufactured by the sol-gel sintering method, the degree of freedom in shape is increased, mass productivity is improved, and a discharge lamp with a built-in refuncter can be manufactured at low cost.

〔Example〕

FIG. 1 is a cross-sectional view of the case where the present invention is applied to a metalnolide lamp as an example of a discharge lamp. A reflector 10 is placed inside the ceramic member 101 that has a built-in reflector.
2 is formed, and a ceramic member 1 is formed with a light emitting surface.
06 to create a closed space 104. An arc tube 105 is installed in the sealed space, and the discharge space 106 is doubly isolated from the outside air. 1 liter closed space 104 is a double air vent 110
It is evacuated, and impurity gas is removed by a getter 107. '17'Cl0B is a molybdenum foil for connection, and 109 is a lead wire. The arc tube is filled with a halide compound and panning gas similar to ordinary metal halide lamps.

In this embodiment, the reflector surface forms a paraboloid of revolution,
An arc tube is placed at the focal point. In this case, the lens formed on the output surface acts as a plano-convex lamp,
Focuses the light emitted from the reflector.

In general, in discharge lamps, the generation of impure gases from moisture due to light emission, or the intrusion of dirt or impure gases from the outside air, causes an increase in moving voltage and deterioration of halide compounds, resulting in a shortened lifespan. The discharge lamp of this construction has a lifespan of several hundred hours. On the other hand, those with a nine-ply tube structure using an outer tube improve the life by one order of magnitude. In this example as well, a two-tube W4 structure was used with one reflector member, and a discharge lamp with a long life of several thousand hours was obtained.

It is possible to confine the arc in a discharge space that is much smaller than a closed space, and it is difficult to use because the luminous efficiency is low when the load on the tube wall is small, and it is now possible to use a lamp instead of the conventional method. An increase in tube wall loading generally serves to improve luminous efficiency.

Next, a method of manufacturing the ceramic member will be explained.

Quartz glass is generally used for arc tubes as a material that can withstand high heat generated by discharge lamps and the like and maintains chemical stability. Regarding the materials used in reflectors,
The arc tube requires resistance to heat generation. Therefore, in this embodiment, the same quartz glass as the arc tube was used. ′! The ceramic members forming the reflector and lens were fabricated using the sol-gel sintering method described below.

Add 180 g of α02 normal hydrochloric acid to 208 g (1 mol) of commercially available ethyl silicate, stir vigorously, and dissolve water at the cutting edge. Add fine powder silica (Aθvosil○x50) to this sol.
t-7522 (manufactured by Nippon Aerosil Co., Ltd., etc.) (1.22 mol) was added with stirring, and a homogeneous sol was obtained by ultrasonication or centrifugal fractionation. To this sol, α1 normal ammonia water was added dropwise to adjust the pH to 14.0. This sol was poured into a reflector-shaped female mold as shown in FIG. 3 and gelled. 301 is a sol inlet.

This gel was removed from the container and dried at 60° C. for 7 days to obtain a dry gel. In the dry gel state, details such as the electrode sealing port and exhaust port were processed. A reflector member was prepared by sintering this at 1300°C. The volume of the gel decreases when it is dried and fired, so the female mold is several times the calculated size. A reflective coating is then applied to the reflector surface.

The light emitting surface member is similarly manufactured by the sol-gel method, and depending on the shape of the lens member and the reflector member, it is also possible to mold the lens member and the reflector member into a single unit. Carbon dioxide laser processing is used to seal the arc tube and attach the light-emitting surface member, and compared to the conventional acid-water flame burner processing method, this method can minimize the intrusion of hydrogen. -! The quartz member manufactured by the sol-gel method also has a hydroxyl group concentration equal to that of vacuum melted silica glass, and can suppress the generation of impurity gas from the member.

Although the parts described above were obtained by molding, multi-parts can also be molded by ordinary polishing and heating processing.

However, the molding method has excellent mass productivity and is very effective in reducing the cost of lamps.

The reflector internal discharge lamp obtained in this way has excellent fc light collection efficiency and has a lifespan of several thousand hours.

〔Effect of the invention〕

As described above, according to the present invention, by installing an arc tube in a closed space formed by a ceramic member having a reflector surface, high light collection efficiency, long life, low luminous efficiency, and mass productivity can be achieved. You can get a good reflector built-in discharge lamp for your friend. A radiating turtle space ft within the source tube of the cabinet
By limiting H, it became possible to apply it to lamps. Furthermore, safety can be improved against explosive lamps such as xenon lamps. By forming a metal lens surface on the light emitting part, it was possible to perform more precise control of light distribution.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a discharge lamp with a built-in reflector according to the present invention. FIG. 2 is a cross-sectional view of a conventional reflector internal xenon lamp. FIG. 3 is a sectional view of the female type of the beam collector. 101... Ceramic member carrying a reflector 102... Ceramic member on the light output side 104... Sealed space 105... @ Light tube 106... Release! Space Above and 1 other person 11 Figure,,x3 21!1 Figure 3

Claims (4)

[Claims] (1) A discharge lamp with a built-in reflector that focuses light from a light source, characterized in that an arc tube is installed in a closed space formed by a ceramic member having a reflector surface on the inner surface. (2) A discharge lamp with a built-in reflector according to claim 1, wherein a lens surface is formed on the light exit surface of the ceramic member. (3) A discharge lamp with a built-in reflector according to claim 1, wherein the ceramic member is made of quartz glass. (4) The discharge lamp with a built-in reflector according to claim 1, wherein the ceramic member is a sol-gel sintered body made of metal alkoxide, finely powdered silica, or the like.