Electric lamp and discharge devices – With magnetic device – With envelope
Patent
1990-03-14
1991-08-13
Yusko, Donald J.
Electric lamp and discharge devices
With magnetic device
With envelope
313 46, 315248, 315344, 315112, 336223, H01J 150, H05B 4116
Patent
active
050399039
ABSTRACT:
An excitation coil for a high intensity discharge lamp has an optimized configuration for maximizing efficiency and minimizing output light blockage. The coil includes a conductive surface having a shape which corresponds to rotating a bilaterally symmetrical trapezoid about a coil center line in the same plane as the trapezoid without intersecting the center line. The conductive surface is disposed on a conductive core for efficient heat removal from the coil, resulting in reduced coil losses. In one embodiment, the coil cross section is increased by adding a rectangular portion to the trapezoidal portion, thereby extending the coil outwardly from the coil center line so as to remove heat from the coil more quickly without affecting light output from the lamp.
REFERENCES:
patent: 2939049 (1960-05-01), Blackman
patent: 3987334 (1976-10-01), Anderson
patent: 4298828 (1981-11-01), Justice et al.
patent: 4810938 (1989-03-01), Johnson et al.
patent: 4812702 (1989-03-01), Anderson
patent: 4910439 (1990-03-01), El-Hamamsy et al.
Breedlove Jill M.
Davis Jr. James C.
General Electric Company
Patel: Ashok
Snyder Marvin
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