Discharge lamp device having semiconductor ceramic cathode

Details Discharge lamp device having semiconductor ceramic cathode Discharge lamp device having semiconductor ceramic cathode

1988-03-22

1989-02-28

Moore, David K.

Electric lamp and discharge devices

With gas or vapor

Having particular electrode structure

313633, 313336, H01J 6106

Patent

active

048088838

ABSTRACT:
A discharge lamp device includes a tube, and a cathode disposed in said tube and made of a valence-compensated semiconductor ceramic material, or a forcibly reduced semiconductor ceramic material, or a valence-compensated and forcibly reduced semiconductor ceramic material. Since the cathode does not include an electron-emitting material, but uses a semiconductor ceramic material, no vapor is produced by the cathode and also the cathode does not react with mercury vapor filled in the tube. Therefore, the discharge lamp device has improved characteristics such as greater heat resistance, better chemical resistance, and improved discharge characteristics. The discharge lamp device is less costly because the semiconductor ceramic material used as the cathode is inexpensive.

REFERENCES:
patent: 3248586 (1966-04-01), Schlegel
patent: 3312853 (1967-04-01), Mela
patent: 4092560 (1978-05-01), Puskas
patent: 4559472 (1985-12-01), Triebel et al.
patent: 4672286 (1987-06-01), Duenisch et al.
Sinter Electrode Type used for Mercury-Vapor Lamp; published on Aug. 28, 1974, by Denki Gakkai Corporation.
J. Illum. Engng. Inst. Japan vol. 69 No. 1; published 1985 pp. 24 to 27 by Shoumei Gakkai.

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