Switching devices for photoflash unit

Combustion – Illuminating flash device – e.g. – photographic bulb – etc. – Fuel charge within sealed transparent casing – e.g. – bulb

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252514, 337416, 338 15, 362 13, F21K 502

Patent

active

042995582

ABSTRACT:
An improved solid state radiant energy switch device is described for operation with a plurality of flash lamps fired individually and in sequence and which is activated by radiant energy generated during flashing of the lamps to convert from a high electrical resistance ("off" condition) to a low electrical resistance or conductive state ("on" condition). Said switches are prepared from an improved material composition which undergoes chemical conversion comprising a carbon-containing silver salt admixed with a humidity-resistant organic polymer binder in ratios wherein said polymer binder does not exceed more than about three percent by weight in said admixture.

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patent: 4133631 (1979-01-01), Collins et al.
patent: 4182608 (1980-01-01), Chevali et al.

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