Contamination-free method of making arc tubes

Details Contamination-free method of making arc tubes Contamination-free method of making arc tubes

1994-12-21

1996-04-09

Ramsey, Kenneth J.

Electric lamp or space discharge component or device manufacturi

Process

With assembly or disassembly

445 42, 445 43, 445 70, H01J 932

Patent

active

055056482

ABSTRACT:
In the manufacture of arc tubes for use as light sources of vehicle headlamps, there is first prepared a semifinished arc tube by inserting one electrode assembly into a tubular glass envelope through one end thereof and by sealing this end. The semifinished arc tube is then placed in communication with a hermetically enclosed space filled with argon under pressure, with the consequent introduction of the inert gas into the glass envelope through a second end thereof. Another electrode assembly and chemicals such as a metal halide and mercury are then introduced from the enclosed space into the semifinished arc tube through the second end, totally without contact with the atmospheric air. Then, with the glass envelope placed out of communication with the enclosed space, the argon is exhausted from within the envelope, and xenon is charged instead into the envelope through the second end, which is closed subsequently.

REFERENCES:
patent: 3357600 (1967-12-01), Brooks
patent: 3650304 (1972-03-01), Airola et al.
patent: 3685880 (1972-08-01), Sobieski
patent: 4586546 (1986-05-01), Mezei et al.
patent: 4799912 (1989-01-01), Salgo 445 26

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