Photoflash unit

Details Photoflash unit Photoflash unit

1997-03-13

1999-04-06

Perkey, W. B.

Photography

With object illumination for exposure

Having exposure synchronizer

431361, G03B 1504, F21K 508

Patent

active

058929924

ABSTRACT:
A photoflash unit includes a housing with an internal chamber containing a charge material. The housing's base has an opening. A primer is placed over or proximate to this opening. An anvil is placed over the material and a burn-away sheet is placed over the anvil. The burn-away sheet is sealed to the base and holds the anvil in place. When the anvil is struck percussively through the burn-away sheet, the primer ignites combustible material through the opening in the back wall. The burn-away sheet burns away, allowing the photoflash unit to vent to the rear.

REFERENCES:
patent: 3439992 (1969-04-01), Shaffer et al.
patent: 3511586 (1970-05-01), Kopelman et al.
patent: 3540820 (1970-11-01), Shaffer et al.
patent: 3706521 (1972-12-01), Kopelman et al.
patent: 3751656 (1973-08-01), Buckler et al.

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