Electric lamp and discharge devices – With gas or vapor – With particular gas or vapor
Patent
1995-04-03
1996-04-23
O'Shea, Sandra L.
Electric lamp and discharge devices
With gas or vapor
With particular gas or vapor
313 25, 313637, H01J 6120
Patent
active
055106765
ABSTRACT:
A high pressure sodium lamp includes discharge vessel (20) which is enclosed with intervening space (1) by an outer bulb (10), which space contains a gas-fill with at least 70 mol. % nitrogen gas. Electrodes (30a, 30b) are positioned in the discharge vessel (20) and are each connected to a current supply conductor (40a, 40b) which issues from the discharge vessel (20) at a respective end (21a, 21b) thereof. The discharge vessel (20) has between the electrodes (30a, 30b) a central portion (22) with length L and volume V. The discharge vessel (20) contains an amalgam containing a weight m.sub.Hg of mercury and a weight m.sub.Na r. of sodium, whereby the following relations are fulfilled: ##EQU1## in which m.sub.Hg and m.sub.Na are expressed in mg, and L and V are expressed in cm and cm.sup.3, respectively. This allows for a stable operation despite temperature fluctuations in the environment, while breakdown in the outer bulb (10) and damage caused by corrosion of current supply connectors (40a, 40b) is prevented.
REFERENCES:
patent: 4755721 (1988-07-01), Okada et al.
patent: 4855643 (1989-08-01), White
patent: 5015913 (1991-05-01), Pfaue
patent: 5142188 (1992-08-01), Ravi et al.
Neues aus der Technik, No. 4, 15 Dec. 1989.
"The High Pressure Sodiumlamp", 1st impression, 1986, de Groot and van Vliet, pp. 165-169.
"White HPS lamps with a Color Temperature of 2700K", S. Carleto et al., J. of the IES, Winter 1991.
Cottaar Eduardus J. E.
Vrugt Peter J.
Esserman Matthew J.
O'Shea Sandra L.
U.S. Philips Corporation
Wieghaus Brian J.
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