High-pressure discharge lamp, method for manufacturing a dischar

Details High-pressure discharge lamp, method for manufacturing a dischar High-pressure discharge lamp, method for manufacturing a dischar

1995-09-28

1998-04-21

Patel, Nimeshkumar

Electric lamp and discharge devices

With gas or vapor

Envelope with particular structure

313489, 313638, H01J 6135

Patent

active

057421269

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.

REFERENCES:
patent: 4339686 (1982-07-01), Potter
patent: 5270615 (1993-12-01), Chang

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