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Short arc type discharge lamp

A discharge lamp and short-arc technology, applied to discharge lamps, gas discharge lamps, high-pressure discharge lamps, etc., can solve problems such as flickering, decreased electron radioactive energy, and underutilization of emissive materials, so as to promote reduction reactions and flicker life long effect

Active Publication Date: 2012-01-11
USHIO DENKI KK
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Problems solved by technology

[0016] Therefore, in the above-mentioned prior art, even though the front end of the cathode contains an emissive material, the emissive material is not fully utilized, and when the surface of the front end of the cathode is depleted of the emissive material, the electron emission energy decreases, and there is a problem of flickering.

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Embodiment Construction

[0027] figure 1 The cathode structure of the short-arc discharge lamp of the present invention is shown, and the cathode 2 is composed of a main body 3 made of tungsten, and an emitter 4 diffusely bonded to its front end. Among them, the diffusion bonding refers to the solid state bonding in which the atoms in the bonded part are diffused by overlapping metal surfaces, heating and pressurizing in a solid state lower than the melting point to the extent that plastic deformation does not occur.

[0028] The above-mentioned main body part 3 is made of, for example, pure tungsten with a purity of 99.99% by weight or more, and the emitter part 4 is composed of thorium oxide (ThO 2 ), so-called thoriated tungsten (also known as thoriated tungsten, Tritan), the content of thorium oxide is, for example, 2wt%.

[0029] In general, the thorium oxide contained in the thoriated tungsten constituting the emitter 4 is reduced by becoming high temperature during lamp lighting, and becomes ...

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Abstract

A short arc type discharge lamp wherein a cathode and an anode are arranged opposite to each other in an interior of a light emitting tube and said cathode comprises a main part made from tungsten and an emitter part made from thoriated tungsten. The cathode effectively utilize thorium oxide contained in the emitter part, and provides a configuration preventing exhaustion of the thorium oxide on the surface of the emitter part.The short arc type discharge lamp is characterized in that gaps are formed locally at a joint face of said main part and the emitter part, and carbonic oxide produced by a reduction reaction of the thorium oxide contained in the emitter part is emitted to the outside.

Description

technical field [0001] The invention relates to a short-arc discharge lamp, in particular to a short-arc discharge lamp whose cathode is provided with an emission part containing thorium oxide. Background technique [0002] Conventionally, in the mercury-enclosed short-arc discharge lamp, the distance between the tips of a pair of electrodes disposed opposite to each other in the luminous tube is short and close to a point light source. The light source of the device is used. Furthermore, short-arc discharge lamps in which xenon is enclosed are used as visible light sources in projectors and the like, and have also been reused as light sources for digital cinema in recent years. [0003] Furthermore, in the above-mentioned short-arc discharge lamp, it is known that an emitting material is provided in the cathode to increase electron emission performance. [0004] Patent Document 1 (JP-A-2010-33825) discloses the structure of a conventional short-arc discharge lamp and its ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01J61/073
CPCH01J61/073H01J61/86
Inventor 池内满清水昭宏有本智良
Owner USHIO DENKI KK
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