Radiation switch for photoflash unit

Details Radiation switch for photoflash unit Radiation switch for photoflash unit

1980-05-09

1982-06-22

Walsh, Donald P.

Illumination

Photographic lighting

Light responsive

362 6, 362 11, 200 6102, 200265, 252518, 431359, G03B 1502

Patent

active

043365701

ABSTRACT:
A photoflash unit having a plurality of flashlamps mounted 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 over a finite time interval. The switches are prepared from compositions comprising admixtures of silver carbonate and/or silver oxide, silver-coated glass beads and a binder; the admixtures may also include electrically non-conductive particulate solids, such as titanium dioxide, and/or silver-coated metal beads. The constituents and proportions of the switch compositions are selected to provide a predetermined conversion time of twelve milliseconds or greater, thereby permitting reliable functioning with comparatively long duration, low voltage firing pulses.

REFERENCES:
patent: 3458270 (1969-07-01), Ganser et al.
patent: 3894226 (1975-07-01), Hanson
patent: 3951582 (1976-04-01), Holub et al.
patent: 3969065 (1976-07-01), Smialek
patent: 3969066 (1976-07-01), Smialek et al.
patent: 3988647 (1976-10-01), Bolon et al.
patent: 3990142 (1976-11-01), Weglin
patent: 3990832 (1976-11-01), Smialek et al.
patent: 3990833 (1976-11-01), Holub et al.
patent: 4017728 (1977-04-01), Audesse et al.
patent: 4080155 (1978-03-01), Sterling
patent: 4087233 (1978-05-01), Schaffer
patent: 4156269 (1979-05-01), Armstrong
patent: 4164007 (1979-08-01), Audesse et al.
patent: 4182607 (1980-01-01), Collins et al.
patent: 4182608 (1980-11-01), Chevali et al.
patent: 4908945 (1978-07-01), Oehmke

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