Arc tube formed from a glass tube and having a spirally...

Details Arc tube formed from a glass tube and having a spirally... Arc tube formed from a glass tube and having a spirally...

2004-11-18

2008-08-12

Santiago, Mariceli (Department: 2879)

Electric lamp and discharge devices

With gas or vapor

Envelope with particular structure

C313S573000, C313S493000

Reexamination Certificate

active

07411351

ABSTRACT:
An arc tube is composed of an arc tube body that is formed by winding a straight glass tube. Two portions of the straight glass tube are spirally wound around an imaginary conical surface. The spiraled portions of the glass tube are sandwiched between a pair of movable fixed plates. The spiraled portions of the glass tube are heated to a temperature equal to or higher than a point at which the glass tube is deformable and yet lower than the softening point of the glass tube. The spiraled portions are flattened by the movable plate moving downwardly under its own weight.

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patent: 5034655 (1991-07-01), Murayama et al.
patent: 2005/0077829 (2005-04-01), Iida et al.
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patent: 10-134718 (1998-05-01), None
patent: 2003-263972 (2003-09-01), None

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