Arc tube for discharge lamp device

Details Arc tube for discharge lamp device Arc tube for discharge lamp device

1997-07-08

1999-03-02

Patel, Nimeshkumar D.

Electric lamp and discharge devices

With gas or vapor

Envelope with particular structure

313623, 445 22, 445 26, 220 21R, 220 22, H01J 6136, H01J 932

Patent

active

058775919

ABSTRACT:
An arc tube for a discharge lamp device comprises: a cylindrical glass tube made of glass, having linear extension portions, each having an opening portion at an end, and a spherically swollen portion formed between the linear extension portions; and electrode assemblies inserted in the respective linear extension portions, wherein neck portions are formed in boundaries between the spherically swollen portion and the linear extension portions so that the glass in each of the linear extension portions side is prevented from flowing into the inside of the spherically swollen portion when the linear extension portions are pinch-sealed.

REFERENCES:
patent: 4396857 (1983-08-01), Danko
patent: 4959587 (1990-09-01), Schug
patent: 5128589 (1992-07-01), Dakin
patent: 5277639 (1994-01-01), Nagata et al.
patent: 5286227 (1994-02-01), Numajiri et al.
patent: 5505648 (1996-04-01), Nagasawa et al.

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