Connect switch

Details Connect switch Connect switch

1979-03-19

1982-03-16

Padgett, Benjamin R.

Illumination

Photographic lighting

Plural light sources or light source supports

200265, 200267, 200 6102, 362251, 431359, H05B 4104, H05B 4302, F21V 2304, F21K 502

Patent

active

043204406

ABSTRACT:
A photoflash unit having a plurality of high voltage type flashlamps mounted in a planar array on a printed circuit board containing circuitry for sequentially igniting the flashlamps in response to successive high voltage firing pulses applied thereto. The circuitry includes a plurality of solid state switches capable of being easily activated by radiant energy generated during flashing of lamps located adjacent to respective switches. Initially, the switches have a high resistance, and after being activated by radiation, they undergo chemical conversion to a conductive state. The switches are prepared from compositions which include a comparatively large proportion of nonconductive inert particulate solids to improve switch functioning.

REFERENCES:
patent: 3990832 (1976-11-01), Smialek et al.
patent: 3990833 (1976-11-01), Holub et al.
patent: 4041300 (1977-08-01), Blount
patent: 4080155 (1978-03-01), Sterling
patent: 4144418 (1979-03-01), Girard
patent: 4182607 (1980-01-01), Collins et al.

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