Electric lamp and discharge devices – With gas or vapor – With particular gas or vapor
Patent
1997-10-07
1999-05-18
O'Shea, Sandra
Electric lamp and discharge devices
With gas or vapor
With particular gas or vapor
313640, 313636, H01J61/22
Patent
active
059053410
ABSTRACT:
A high pressure mercury ultraviolet lamp with high dimensional accuracy in which the emitter material during lamp operation is prevented from spraying and being deposited on the wall of the discharge vessel and the UV radiation transmission factor is prevented from being reduced is achieved by the fact that at least one of a group of halides which consists of halides of yttrium, lanthanum, cerium, dysprosium, gadolinium and thorium and at least one of a group of halides which consists of halides of alkali metal elements are filled at a filling ratio in the range from 1:4 to 1:20 to one another as a molar fraction. This also yields the same action as the application of emitter material to the upholding parts of the electrodes. Furthermore, high dimensional accuracy can be ensured by the measure by which the discharge vessel is made of a translucent ceramic, such as YAG.
REFERENCES:
patent: 3786297 (1974-01-01), Zollweg et al.
patent: 3911308 (1975-10-01), Akutsu et al.
patent: 4074164 (1978-02-01), Leyendecker
patent: 5694002 (1997-12-01), Krasko et al.
Thermodynamic Properties of NaI-DyI.sub.3 System in Melts And Saturated Vapours, Proceeding of the Symposium On High Temperature Lamp Chemistry II, O. Kaposi et al., vol. 88-4, pp. 70-89(No Month).
Ikeuchi Mitsuru
Matsuno Hiromitsu
Morimoto Yukihiro
Day Michael
O'shea Sandra
Safran David S.
Ushiodenki Kabushiki Kaisha
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