Miniature projection lamp

Details Miniature projection lamp Miniature projection lamp

1997-09-24

1999-08-24

O'Shea, Sandra

Electric lamp and discharge devices

With gas or vapor

Having a particular total or partial pressure

313574, 313628, 313638, 313639, 313640, H01J 1720, H01J 6112

Patent

active

059428503

ABSTRACT:
A high performance miniature projection lamp which includes a glass envelope having a pair of opposite neck portions each with a coaxial central opening having a reduced section and an hermetically sealed central chamber having a volume of about 130 mm.sup.3 which contains a fill. The fill includes an argon pressure at room temperature at a range of about 0.5 atmospheres to about 2.0 atmospheres and mercury in an amount in the range of about 5 mg to about 15 mg, and a mixture of metal halide material in an amount from about 50 up to 1000 micrograms. A pair of axially aligned electrodes are positioned at opposite neck portions and separated form each other by a predetermined distance. The electrodes each have a shank portion which each having a coil wrapped around its end.

REFERENCES:
patent: 4594529 (1986-06-01), De Vrijer
patent: 4884009 (1989-11-01), Rothwell, Jr. et al.
patent: 5109181 (1992-04-01), Fischer et al.
patent: 5451838 (1995-09-01), Kawai
patent: 5691601 (1997-11-01), Frey et al.

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