Electric lamp and discharge devices – With gas or vapor – Envelope composition
Patent
1995-06-21
1997-09-23
Patel, Nimeshkumar
Electric lamp and discharge devices
With gas or vapor
Envelope composition
313571, 313639, 313642, H01J 1716, H01J 6130
Patent
active
056708440
ABSTRACT:
A good discharge lamp which can emit light with wavelengths in the range of 220 nm in an amount sufficient for industrial applications and at the same time can adequately maintain a transmission factor of the radiant light and emits neither water nor hydrogen or the like during luminous operation is achieved by the fact that, in a discharge lamp in which a pair of electrodes are located adjacent to one another encapsulated within a quartz glass fluorescent tube together with mercury and an inert gas, the quartz glass contains an OH radical concentration of a weight of in the range of 300 to 800 ppm. Furthermore, the content of metallic impurities in the quartz glass is limited to a weight less than or equal to 1 ppm.
REFERENCES:
patent: 4156826 (1979-05-01), Hernqvist
patent: 5541481 (1996-07-01), Yamaguchi et al.
Nakamura Kiyotada
Yasudaa Yukio
Patel Nimeshkumar
Safran David S.
Ushiodenki Kabushiki Kaisha
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