Glow discharge lamp containing thermal switch for producing doub

Details Glow discharge lamp containing thermal switch for producing doub Glow discharge lamp containing thermal switch for producing doub

1989-08-23

1991-03-19

Yusko, Donald J.

Electric lamp and discharge devices

With gas or vapor

Negative or cathode glow device

313601, 313631, 313491, 315 75, H01J 1700, H01J 6164

Patent

active

050013947

ABSTRACT:
A preheat-type fluorescent lamp, such as a negative glow discharge lamp, includes a cathode contained within an evelope and supported by a pair of lead-in wires. A thermal switch is located within the evelope shunting the cathode and electrically coupled to the supporting lead-in wires. Closure of the thermal switch during lamp operation produces a double hot spot on the shunted cathode. As a result, the cathode temperature is lowered sufficiently causing an improvement in the lumen maintenance and life of the lamp.

REFERENCES:
patent: 2337993 (1943-12-01), Hall, Jr. et al.
patent: 2341990 (1944-02-01), Inmann et al.
patent: 2351305 (1944-06-01), Thayer
patent: 4616156 (1986-10-01), Roche et al.
patent: 4647893 (1987-03-01), Sindlinger
K. Yuhara, F. Nakaya, and N. Aoike, "High Frequency Operation Producing Double Hot Spots on Electrodes for Fluorescent Lamps," pp. 181-190, Journal of the Illuminating Engineering Society--Summer 1987.

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