ARC tube discharge lamp with compression strain layer

Details ARC tube discharge lamp with compression strain layer ARC tube discharge lamp with compression strain layer

2005-10-13

2008-10-28

Roy, Sikha (Department: 2879)

Electric lamp and discharge devices

With gas or vapor

Electrode composition

C313S631000

Reexamination Certificate

active

07443100

ABSTRACT:
In a mercury-free arc tube, electrodes are configured by electrode rods heat-treated at 1,200 to 2,200° C. in a vacuum atmosphere, and which have a thickness of 0.3 mm or more. The size (radius R) of a residual compression strain layer formed around the electrode rod is set to be ¼ or less of the width D of the pinch seal portion. A glass layer outside the residual compression strain layer is thickened, thereby enhancing the strength of the pinch seal portion.

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