High pressure discharge lamp with overhung end arc tube and cerm

Details High pressure discharge lamp with overhung end arc tube and cerm High pressure discharge lamp with overhung end arc tube and cerm

1986-08-04

1989-02-28

DeMeo, Palmer C.

Electric lamp and discharge devices

With gas or vapor

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

313634, 313636, H01J 6136, H01J 6130

Patent

active

048088820

ABSTRACT:
An arc tube for a high pressure discharge lamp comprises a sealing element displaced from the end and sintered within the arc tube to form an overhung end. An electrically conductive cermet end member has a boss member which fits within a central aperture in the sealing element to thereby centralize the cermet end member within the arc tube. The cermet end member is therefore positioned within the arc tube independently of the arc tube wall and any distortion of the arc tube which has taken place during sintering of the sealing element has no effect. Preferred dimensions of the components are given so that cracking of the cermet end member is avoided and suitable electrical resistance is achieved.

REFERENCES:
patent: 3363134 (1968-01-01), Johnson
patent: 3564328 (1971-02-01), Bagley et al.
patent: 4501799 (1985-02-01), Driessen et al.
patent: 4539511 (1985-09-01), Denbigh et al.
patent: 4665344 (1987-05-01), Kajihara et al.

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