Small arc tube, low-pressure mercury lamp, lighting...

Details Small arc tube, low-pressure mercury lamp, lighting... Small arc tube, low-pressure mercury lamp, lighting...

2004-08-13

2008-08-12

Roy, Sikha (Department: 2879)

Electric lamp and discharge devices

With gas or vapor

Envelope with particular structure

C313S635000, C313S567000, C313S639000

Reexamination Certificate

active

07411350

ABSTRACT:
A mandrel has a main body having a substantially-cone-shape. The main body has, on its circumferential surface, a spiral-shaped groove at which the glass tube to be wound is held. The groove, in cross section, has a contact range in which the glass tube's circumferential surface is in contact. One end of the contact range corresponds to a circumference part of the glass tube in wound state which is closest to the axis of the main body of the mandrel, a part of the groove that extends from the circumference part towards the apex of the main body is parallel to the axis of the mandrel, and the pitch of the groove in the axial direction of the mandrel is formed smaller than the outer diameter of the glass tube. The glass tube wound on the mandrel is easily removed from the main body by lowering the mandrel. In the arc tube formed in such a way, any two glass tube portions, which are adjacent to each other in the axial direction of the arc tube, overlap with each other.

REFERENCES:
patent: 2473878 (1949-06-01), Greiner
patent: 3558963 (1971-01-01), Hanneman et al.
patent: 6545430 (2003-04-01), Ono et al.
patent: 6630780 (2003-10-01), Yan
patent: D488874 (2004-04-01), Li
patent: D503814 (2005-04-01), Iida
patent: D503987 (2005-04-01), Iida
patent: 2003/0234614 (2003-12-01), Itaya et al.
patent: 2006/0197451 (2006-09-01), Iwase
patent: 2534674 (2003-02-01), None

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