High voltage mercury lamp and sealing material for same

A technology for high-pressure mercury lamps and sealing materials, which is applied in the manufacture of discharge lamps, gas discharge lamps, discharge tubes/lamps, etc., can solve problems such as the influence of luminous characteristics, and achieve the effects of improving reliability and reducing thermal expansion coefficient
CN1463028AInactive Publication Date: 2003-12-24NGK INSULATORS LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NGK INSULATORS LTD
Publication Date
2003-12-24
Estimated Expiration
Not applicable · inactive patent

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Abstract

An object of the invention is to reduce the adverse effects due to a difference of thermal expansion between a conductive sealing member (7A) and a light-emitting vessel (16) and to provide a reliable high pressure mercury lamp, even when the lamp is operated at a high pressure. The lamp has a light-emitting vessel (16) of quartz and having end portions, an electrode member (10) contained in the vessel (16), and a conductive sealing member (7A). The sealing member (7A) is fixed in the end portion (18) and connected to the electrode member (10). The conductive member (7A) is composed of a sintered body (4) made from silica granules (1) each having a coating (3) of a metal or a metal compound. The sintered body (4) has a conductive network structure made of the metal and having a content of the metal of not higher than 20 volume percent.
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Description

technical field

[0001] The invention relates to a high-pressure mercury lamp and a sealing material for a high-pressure mercury lamp. Background technique

[0002] High-pressure mercury lamps that use quartz luminous tubes and seal high-pressure mercury in the luminous tubes are used in OHP (overhead projectors), liquid crystal projectors, and automotive headlights. Since the luminous tube made of quartz is transparent, the luminescent part formed by the arc in the discharge tube can be directly used as a point light source of the discharge lamp.

[0003] In the high-pressure mercury lamp described in JP-A-55-117859, a metal foil is fixed to the end of a quartz arc tube, and the end of the arc tube is clamped and sealed. As the metal foil, a molybdenum foil surface is coated with a metal such as tantalum, niobium, chromium, or yttrium. In this sealing method, molybdenum foil is clamped on the end of the arc tube, and the end is heated to soften it. In this state, the moly...

Claims

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