Discharge lamp

A technology for discharge lamps and discharge vessels, which is applied in the direction of discharge lamps, gas discharge lamps, parts of gas discharge lamps, etc. It can solve the problems of unable to maintain discharge, achieve the effects of inhibiting reduction reaction, promoting reduction reaction, and inhibiting outflow

Active Publication Date: 2010-08-04
USHIO DENKI KK
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] However, in the presence of lanthanum oxide (La 2 o 3 ) In a discharge lamp that is a cathode of a material that easily emits electrons, due to the high heat load applied to the cathode when the lamp is turned on, lanthanum (La) evaporates and depletes at an early stage, resulting in a problem that a stable discharge cannot be maintained

Method used

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Embodiment

[0060] In a tungsten metal matrix, carbon was solid-dissolved in a material containing metal oxides of lanthanum and metal oxides of zirconium to form a cathode, and a xenon short-arc lamp was produced using the cathode, and the lamp voltage was measured up to 1000 hours of lighting.

[0061] The configurations of the cathode and the xenon short-arc lamp are as follows.

[0062]

[0063] Enclosed gas: xenon (Xe) 0.65M Pa (static pressure)

[0064] Input: 2kW

[0065] Cathode: the length in the axial direction is 15mm, the outer diameter of the trunk is 6mm, the angle of the taper is 40°, the main component is tungsten, and 2wt.% La is added 2 Zr 2 o 7

[0066]As Experimental Object 1, a cathode made of a material in which carbon was solid-dissolved in tungsten at a concentration of about 10 wt.ppm was prepared. As test object 2, carbon was dissolved in tungsten at a concentration of about 50 wt.ppm at the front end about 3mm from the surface, and carbon was dissolved at...

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Abstract

A discharge lamp having a cathode containing lanthanum oxide (La2O3) as an electron emission material, to provide a discharge lamp where reduction of lanthanum oxide (La2O3) is accelerated; a supply amount of lanthanum (La); and its lifespan is long has an anode (4) and a cathode (5) arranged within a discharge vessel (1) so as to face toward each other in a tube axis direction of the discharge vessel (1), and the cathode (5) is made from a material containing a metal oxide of lanthanum (La2O3) and a metal oxide of zirconium (ZrO2) in a tungsten metal (W) substrate with carbon (C) present as a solid solution in the tungsten metal (W) substrate forming the cathode (5).

Description

technical field [0001] The present invention relates to a high-load, high-brightness discharge lamp, and more particularly, to a discharge lamp characterized in that a material containing lanthanum (La) is used as a material prone to electron emission in a cathode material. Background technique [0002] In a discharge lamp in which mercury is enclosed in a discharge space used as a light source for an exposure device used in exposure processing, or in a discharge lamp in which xenon gas is enclosed in a discharge space used as a light source in a projector or the like, it is known that Lanthanum oxide (La 2 o 3 ) as an electron-emissive material can exhibit good electron emission characteristics. [0003] However, in the presence of lanthanum oxide (La 2 o 3 ) In a discharge lamp that is a cathode of an easily electron-emitting material, lanthanum (La) evaporates and depletes at an early stage due to a high heat load applied to the cathode when the lamp is turned on, res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01J61/06
CPCH01J61/0737H01J61/06
Inventor 池内满有本智良
Owner USHIO DENKI KK
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