Photoflash lamp construction and method of making same

Details Photoflash lamp construction and method of making same Photoflash lamp construction and method of making same

1978-12-21

1981-06-02

Moy, Joseph Man-Fu

Combustion

Illuminating flash device, e.g., photographic bulb, etc.

Fuel charge within sealed transparent casing, e.g., bulb

431365, F21K 502

Patent

active

042708974

ABSTRACT:
A high-voltage type photoflash lamp filled with a filamentary combustible material and oxygen and having an ignition structure including a pair of spaced-apart lead-in wires sealed in one end of the glass envelope of the lamp and encapsulated within an interior protruding portion of the envelope glass. The termination of each of the lead-in wires within the envelope is bare of sealing glass and substantially flush with the surrounding glass surface, and a coating of primer material about the inner end of the protruding portion of glass within the envelope covers and bridges the bare terminations of the lead-in wires. Also disclosed is a method of making a lamp including the steps of heating one end of a length of glass tubing to seal it closed, pushing a pair of spaced-apart metal lead-in wires through the heated, closed end of the glass tubing whereby the heated glass thereat is stretched and sealed over the wires to provide a protruding portion of glass within the tubing which encapsulates the termination of the lead-in wires, selectively removing only the glass covering the terminations of the lead-in wires to expose the bare metal thereof, applying a coating of primer material about the end of the protruding portion of glass within the tubing so as to cover and bridge the bare terminations of the lead-in wires, and then finishing the lamp.

REFERENCES:
patent: 3312085 (1967-04-01), Schilling et al.
patent: 3627459 (1971-12-01), Tas et al.
patent: 3721515 (1973-03-01), Boekkooi et al.
patent: 3873261 (1975-03-01), Cote
patent: 4008040 (1977-02-01), Murray et al.

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