JPH0664201U - Metal halide lamp with reflector - Google Patents

Abstract

(57) [Summary] [Objective] The present invention aims to prevent deterioration due to high temperature of a reflecting mirror integrally combined with a small high-power metal halide lamp used only in an arc tube without using an outer tube. . [Structure] A metal halide lamp made of an arc tube made of quartz glass is arranged at the bottom of a spheroidal reflecting mirror formed by coating a selective reflection film made of a multilayered dielectric film on a substrate made of crystallized glass. To be done.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention is a combination of a metal halide lamp consisting of an arc tube only, without using an outer tube, and a reflecting mirror, which is used for relatively small optical devices by distributing light in an optically limited space area. It relates to the improvement of a metal halide lamp with a reflector used as a light source.

[0002]

[Prior art]

 Conventionally, this type of reflector-integrated metal halide lamp has been widely used as a light source for general lighting, a light source for optical fibers, or a light source for video equipment.In recent years, a lamp with large input power has been used to obtain higher illuminance. There is more to do.

However, in a lamp in which an arc tube with a high input and a reflecting mirror are integrally combined, the temperature of the reflecting mirror increases significantly, and the lamp is finally lit beyond the heat resistant temperature of the glass as the reflecting mirror material. Then, there is a problem that the reflecting mirror is damaged due to thermal stress while the blinking is repeated.

Therefore, it is conceivable to use ceramics, which has a higher heat resistance than hard glass, as the material of the reflecting mirror, but its workability is poor and there is a problem.

[0005]

[Problems to be solved by the device]

 In view of the above problems, the present invention provides a high output lamp by providing a selective reflection film made of a dielectric multilayer film on a substrate made of crystallized glass having a small thermal expansion as a reflecting mirror. It is an object of the present invention to provide a metal halide lamp with a reflecting mirror that does not cause accidents such as breakage of the reflecting mirror even when combined.

[0006]

[Means for Solving the Problems]

 The present invention relates to a lamp with a reflector, which is a parabolic, ellipsoidal, hyperboloidal, spherical surface or a combination thereof, in which a metal halide lamp made of a quartz glass arc tube is arranged without an outer tube at the bottom. The reflecting mirror is characterized in that a selective reflection film made of a dielectric multilayer film is deposited on a substrate made of crystallized glass.

[0007]

【Example】

 The present invention will be described below based on the illustrated embodiments. In the figure, 1 is a quartz arc tube, which is a short arc metal halide lamp with a main electrode sealed at both ends and mercury, metal iodide, and argon sealed inside, and the distance between the electrodes is about 7 mm. A mixture of alumina and silica is applied to the outer surface of the seal portion as a reflective and heat retaining film 2.

Further, the arc tube 1 is mainly composed of SiO ₂ , Al ₂ O ₃ , and is a crystallized glass in which a β-spodumene solid solution or a β-eucryptite solid solution is formed by heat treatment, A visible light reflection ultraviolet and infrared transmission type selective reflection film 3 composed of a dielectric multilayer film is applied, and an adhesive 5 is used almost on the focal point of a spheroidal reflecting mirror 4 having an effective diameter of 66φ. It is fixed.

Next, a metal halide lamp with a reflecting mirror having a rated input of 250 W was lit horizontally using an electronic ballast and the temperature of each part of the reflecting mirror was measured.

[0010]

[Table 1] Temperature of each part of the reflector

Further, a lamp including a lamp in which a reflecting mirror based on crystallized glass of the present embodiment and an arc tube are integrally fixed, and a conventional reflecting mirror based on hard glass having an expansion coefficient α = 38 are used. When 5 and 5 each were horizontally lit, they were blinked and lit in a cycle of 1 hour lighting and 1 hour unlit. After 300 hours lighting, 3 out of 5 lamps with a reflector made of hard glass were damaged. Nevertheless, none of the lamps with a reflecting mirror according to the present invention based on crystallized glass is damaged.

[0012]

[Effect of device]

 As described above, in the present invention, since the reflecting mirror based on crystallized glass and the arc tube are integrally fixed, even if the input power to the arc tube is large, the reflecting mirror is damaged. The effect is large.

[Brief description of drawings]

FIG. 1 is an explanatory view of a metal halide lamp with a reflecting mirror according to the present invention.

[Explanation of symbols]

 1 Arc tube 2 Reflective / heat retaining film 3 Selective reflective film 4 Reflector 5 Adhesive

Claims (1)

[Scope of utility model registration request] 1. A lamp with a reflector, which is a parabolic, ellipsoidal, hyperboloidal, spherical, or a combination thereof, in which a metal halide lamp made of a quartz glass arc tube is arranged without an outer tube provided at the bottom. In the metal halide lamp with a reflecting mirror, the reflecting mirror comprises a substrate made of crystallized glass and a selective reflecting film made of a dielectric multilayer film.