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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

Inactive Publication Date: 2003-12-24
NGK INSULATORS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, the shape of the discharge arc deviates from the design value and changes, which affects the luminous characteristics

Method used

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  • High voltage mercury lamp and sealing material for same
  • High voltage mercury lamp and sealing material for same
  • High voltage mercury lamp and sealing material for same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0058] Embodiment (Experiment 1)

[0059] According to reference Figure 1 to Figure 6 To illustrate the method, manufacture as Figure 6 A high pressure mercury lamp of the form shown. Specifically, polyvinyl alcohol was added to silica powder to obtain silica particles. The aqueous solution of nickel nitrate is added to the tungsten oxide powder and mixed evenly, and then it is coated on the surface of the silica particles. The obtained raw material powder, with 0.5~3.0t / cm 2 Press forming under high pressure to obtain a cylindrical shape. The molded body is degreased at a temperature of 600 to 800°C in the air, and fired at a temperature of 1500 to 1700°C in a reducing atmosphere to obtain a cylindrical conductive sealing material made of cermet. The conductive sealing material had an average particle diameter of 300 μm, a tungsten content of 10% by volume, and a nickel content of 1 / 100 by weight of tungsten.

[0060] Ru-Mo-B solder was adhered to both end surfaces of...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01J5/32H01J9/32H01J61/36H01J61/82
CPCH01J61/822H01J61/366H01J9/323H01J5/32H01J61/363
Inventor 新见德一
Owner NGK INSULATORS LTD
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