Radiation switch for photoflash unit

Details Radiation switch for photoflash unit Radiation switch for photoflash unit

1980-05-09

1982-05-18

Schafer, Richard E.

Illumination

Photographic lighting

Light responsive

362 13, 362 14, 362 15, 200 6102, 431359, 252514, 252520, G03B 1502

Patent

active

043308210

ABSTRACT:
A photoflash unit having a plurality of flashlamps mounted in a planar array on a printed circuit board containing circuitry for sequentially igniting the flashlamps in response to successive firing pulses applied thereto. The circuitry includes a plurality of solid state switches capable of being activated by radiant energy generated during flashing of lamps located adjacent to respective switches. Initially, each of the switches has a resistance sufficiently high to provide an open circuit to the applied firing pulses, and after being activated by radiation, the switch undergoes chemical conversion to a conductive state. The switches are prepared from compositions which include a selected proportion of silver-coated glass beads to consistently assure a predetermined low resistance after conversion and maintenance of good adherence and electrical contact with the printed circuit board circuitry.

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