Excitation coil for an electrodeless high intensity discharge la

Electric lamp and discharge devices – With magnetic device – With envelope

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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.

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