Electric lamp or space discharge component or device manufacturi – Process – With coating – e.g. – providing protective coating on...
Patent
1998-09-16
1999-07-20
Ramsey, Kenneth J.
Electric lamp or space discharge component or device manufacturi
Process
With coating, e.g., providing protective coating on...
20419212, H01J 6135
Patent
active
059249048
ABSTRACT:
In a quartz glass tube body for high-pressure discharge lamp, the devitrification occurs during lighting, a light flux decreases and finally the useful life ends, where the main cause of this devitrification phenomenon is reaction between a sealed substance and the quartz glass tube body. It is one object of the present invention to attain the longer useful life, for example, of a high-pressure discharge lamp by preventing such a phenomenon. According to the present invention, a coating is made up by forming one or more oxynitride layers of an element chosen from among aluminum, tantalum, niobium, vanadium, chromium, titanium, zirconium, hafnium, yttrium, scandium, magnesium, silicon and lanthanum rare earth elements. By incorporating a bilayer coating on the inside wall of said hollow tube body, for example, that is composed of an aluminum oxynitride layer and an aluminum nitride layer obtained from application of a high-frequency wave between the sputter electrodes and generation of a glow discharge, a durable coating can be formed, thereby enabling the useful life of a high-pressure discharge lamp to be lengthened.
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EP Search Report dated Apr. 16 1998 corresponding to Application No. EP 95 11 4825.
Fujii Ken-ichi
Takeda Mamoru
Matsushita Electric - Industrial Co., Ltd.
Ramsey Kenneth J.
Rhodes Gene H.
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