Low pressure gas discharge lamp

Details Low pressure gas discharge lamp Low pressure gas discharge lamp

1991-03-27

1993-11-30

Yusko, Donald J.

Electric lamp and discharge devices

With gas or vapor

Having electrode exterior to envelope

313492, 313493, 313488, 313634, H01J 1100

Patent

active

052668665

ABSTRACT:
A low pressure gas discharge lamp comprises an elongated tube filled with a discharge gas. An inner electrode is disposed in a first end portion of the tube and an outer electrode is formed on an outer surface of the tube. The outer electrode has a belt shaped portion formed on the outer surface of the tube along an axial direction of the tube between the first end portion and a second end portion of the tube and a ring shaped portion formed on the outer surface of the tube around the second end portion of the tube. The ring shaped portion is connected to the belt shaped portion. The discharge is generated between the inner electrode and the outer electrode. The ring shaped portion of the outer electrode prevents the discharge from shifting from a central axis of the tube, and thus makes the lamp have an even brightness distribution along the axis of the tube.

REFERENCES:
patent: 1612387 (1926-12-01), Machlett
patent: 2068741 (1937-01-01), Geffcken et al.
patent: 4147951 (1979-04-01), Mueller
patent: 4645979 (1987-02-01), Chow
patent: 4765820 (1988-08-01), Naganawa et al.
patent: 4871941 (1989-10-01), Dobashi et al.
patent: 4887002 (1989-12-01), Dobashi et al.
patent: 4899090 (1990-02-01), Yoshiike et al.

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