Barium-silica glass lamp having thermally balanced lead-in...

Details Barium-silica glass lamp having thermally balanced lead-in... Barium-silica glass lamp having thermally balanced lead-in...

2007-01-16

2007-01-16

Williams, Joseph (Department: 2879)

Electric lamp and discharge devices

With gas or vapor

Envelope composition

C313S634000, C313S635000, C313S639000, C313S638000

Reexamination Certificate

active

11023934

ABSTRACT:
An automotive lamp has a sealed envelope of barium silica glass that is essentially free of cadmium and in which a light emitting element is contained. Lead-in wires extend through the envelope and are coupled to the light emitting element. The glass envelope and lead-in wires have respective coefficients of thermal expansion over a temperature range form ambient to 520° C. which closely match one another to minimize stress and cracking of the envelope at the interface.

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