Inductively coupled incandescent light bulb

Details Inductively coupled incandescent light bulb Inductively coupled incandescent light bulb

1995-10-10

1999-05-18

Lee, Benny

Electric lamp and discharge devices: systems

Combined load device or load device temperature modifying...

Discharge device load

315 62, 313160, H01K13/06

Patent

active

059053437

ABSTRACT:
An incandescent bulb having a looped filament within an evacuated bulb containing a gas mixture including a halogen employs magnetic means external to the bulb to provide inductive heating of the filament so that there are no connections passing through the bulb envelope. Alternative embodiments include a toroidal bulb wherein a second arm of a magnetic circuit passes normally through the center of the bulb toroid, alternating voltage excitation being supplied to a first arm of the magnetic circuit; and an elliptical bulb that is disposed between oppositely facing ends of a two-part second magnetic arm that is similarly excited. In a further embodiment, an additional arm of the magnetic circuit serves to form a non-uniform field in the vicinity of the filament, thereby to provide a lift force against the force of gravity so as to minimize filament sagging.

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