Electric lamp and discharge devices – With gas or vapor – Having a particular total or partial pressure
Patent
1994-03-04
1995-07-18
O'Shea, Sandra L.
Electric lamp and discharge devices
With gas or vapor
Having a particular total or partial pressure
313571, 313641, 313642, H01J 1726
Patent
active
054344735
ABSTRACT:
This invention relates to a high pressure sodium vapor discharge lamp the discharge space of which is enclosed by a ceramic vessel having hermetically sealed ceramic end members with electric lead wires connected with electrodes inside the discharge vessel and the discharge vessel contains sodium, noble gas, mercury in a concentration of 0-5 mg/cm.sup.3 and at least one further metal additive having a vapor pressure not exceeding 7.5 torr at 1000K temperature. The discharge lamp according to the invention is further characterized in that the molar fraction of sodium in the total metal additive exceeds 0.5 and the molar fraction of sodium is greater than four times the molar fraction of mercury.
REFERENCES:
patent: 3248590 (1966-04-01), Schmidt
patent: 3781586 (1973-12-01), Johnson
patent: 4260929 (1981-04-01), Jacobs et al.
patent: 4801846 (1989-01-01), Kramer et al.
patent: 4972118 (1990-11-01), Yorifuji et al.
patent: 5075587 (1991-12-01), Pabst et al.
patent: 5150017 (1992-09-01), Geens et al.
1988 Derwent Publications Ltd., Saturated Vapour High Pressure Sodium Lamp, all pages. (EP 0257830).
Corwin Stanley C.
Hawranko George E.
O'Shea Sandra L.
Tungsram Co., Ltd.
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