Method of making a single-ended metal halide high-pressure disch

Details Method of making a single-ended metal halide high-pressure disch Method of making a single-ended metal halide high-pressure disch

1986-10-06

1988-02-02

Ramsey, Kenneth J.

Electric lamp and discharge devices

With gas or vapor

Envelope with particular structure

313318, 313332, 65 55, 65 5926, H01J 932

Patent

active

047230924

ABSTRACT:
To improve the high-voltage flash-over resistance by increasing the lead aration of the lamps, the pinch or press seal is, while the lamp is being made and the lamp tubing is in plastically deformable condition, extended at least is the region adjacent the end of the later formed pinch seal by introducing spreader jaws, either parallel or, at least eventually, in acutely angled relation to each other into the softened end portion, and then spreading apart the jaws so that, at the outer end portions of the jaws, the plastically deformable region will assume an oval shape whose longer dimension is wider than the outer diameter of the tubing in the region which will later from the discharge vessel.

REFERENCES:
patent: 3609212 (1971-09-01), Lewis
patent: 4542316 (1985-09-01), Hall et al.
patent: 4668204 (1987-05-01), English et al.

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