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 1166839
D-22,086 - 21 - RADIATION SWITCH FOR PHOTOFLASH UNIT ABSTRACT OF THE DISCLOSURE 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.
376024
Brower Boyd G.
Shaffer John W.
Gte Products Corporation
R. William Wray & Associates
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