Compact fluorescent lamp as a retrofit for an incandescent lamp

Details Compact fluorescent lamp as a retrofit for an incandescent lamp Compact fluorescent lamp as a retrofit for an incandescent lamp

1998-05-04

2000-05-16

Wong, Don

Electric lamp and discharge devices: systems

Combined load device or load device temperature modifying...

Discharge device load

315634, 313634, 31331801, 313493, 362362, H01J 744

Patent

active

06064155&

ABSTRACT:
A compact fluorescent lamp is designed to imitate an incandescent lamp in size, shape and luminosity. The lamp includes a bulbous envelope (14) having an external shape of an incandescent lamp (10) on a standard Edison-type base (11) that enables it to be substituted for standard 60, 75 and 100 W incandescent lamps. A low-pressure fluorescent lamp (18) having a coiled tubular envelope with an outer diameter less than about 7 mm, an inner diameter between about 1 and 5 mm, and a length between about 50 and 100 cm is wound in a coil around the axis of the bulbous envelope (14) and is disposed within the bulbous envelope. The tubular envelope is formed of soft glass and has a fluorescent phosphor coating disposed on the inner surfaces. Electrodes (14) with external electrical contacts are disposed at each end of the envelope. A ballast (12) is disposed within the bulbous envelope. The ballast is electrically connected to the lamp (15), whereby to control current in the fluorescent lamp. A heat shield (17) is disposed between the lamp and the ballast to thermally isolate the lamp from the ballast, whereby heat from the lamp will not adversely affect the ballast.

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Daniel J. Cotter et al.; "Subminiature Fluorescent Lamps"; IEE/IAS Confere, Toronto, Canada; Oct., 1993; pp. 2266-2271.

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