G - Physics – 03 – C
Patent
G - Physics
03
C
31/104, 315/17,
G03C 1/00 (2006.01) G03B 15/04 (2006.01) H05K 1/00 (2006.01)
Patent
CA 1166840
20 RADIATION SWITCH FOR PHOTOFLASH UNIT . ABSTRACT OF THE DISCLOSURE 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 con- version 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 compi- tions 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.
376103
Brower Boyd G.
Houseknecht Gary L.
Gte Products Corporation
R. William Wray & Associates
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