H - Electricity – 01 – J
Patent
H - Electricity
01
J
313/10
H01J 61/30 (2006.01) H01J 61/82 (2006.01)
Patent
CA 1243721
-18- ABSTRACT This invention provides a specially shaped arc tube for a high-intensity arc discharge lamp, particularly a lamp for vertical operation. The arc tube has a hemispherical top with radius R1, a hemispherical bottom with radius R2, and a middle section being a frustum of a right circular cone which on one end mates with the top and on the other end mates with the bottom so than the arc tube has a smooth and continuous surface. R2 is greater than or equal to two millimeters. The ratio R1/R2 is always greater than one, and in preferred embodiments R1/R2 is within the range of 1.5 to 3, inclusive. This arc tube virtually eliminates species segregation in metal halide lamps even though the arc is vertical. The invention also includes an arc discharge lamp employing an arc tube as described herein together with an optimum choice of design parameters, such as wall loading and nitrogen pressure within the outer envelope. The virtual elimination of species segregation of the additives along the arc axis provides this lamp with higher luminous output, lower color temperature, improved luminous efficacy, extended life, an no perceptible flicker with electrical current at fifty hertz compared with counterparts in the existing art.
482188
English George J.
Fohl Timothy
Rothwell Harold L. Jr.
Gte Products Corporation
R. William Wray & Associates
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