Ceramic envelope device for high-pressure discharge lamp

Details Ceramic envelope device for high-pressure discharge lamp Ceramic envelope device for high-pressure discharge lamp

1987-12-21

1989-02-28

DeMeo, Palmer C.

Electric lamp and discharge devices

With gas or vapor

Having electrode lead-in or electrode support sealed to...

313625, 313634, H01J 6136, H01J 6130

Patent

active

048088811

ABSTRACT:
A ceramic envelope device for use in a HID (high intensity discharge) lamp, which includes: (a) a translucent ceramic tube; (b) a pair of electrically conductive end caps which close longitudinally opposite ends of the ceramic tube; (c) a pair of oppositely located discharge electrodes each of which is supported at a first end thereof by a corresponding one of the end caps such that a second end of each electrode protrudes from an inner surface of the corresponding end cap in a longitudinally inward direction in the ceramic tube; (d) an electrical insulator provided for one or both of the pair of end caps; and (e) a sealing member disposed to maintain fluid-tightness between an engaging portion of the end cap for which the electrical insulator is provided, and the corresponding end of the ceramic tube. The electrical insulator includes a peripheral portion which covers a peripheral portion of the inner surface of the corresponding end cap, and the end of the ceramic tube sealed by the sealing member includes a contact portion which contacts the peripheral portion of the electrical insulator, to thereby isolate the sealing member from an inner space in which the second end of each discharge electrode extends.

REFERENCES:
patent: 4155757 (1979-05-01), Hing
patent: 4155758 (1979-05-01), Evans et al.
patent: 4665344 (1987-05-01), Kajihara et al.
patent: 4687969 (1987-08-01), Kajihara et al.
patent: 4694219 (1987-09-01), Hing

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