Illumination – Photographic lighting – Safety or interlocks
Patent
1977-04-08
1978-12-19
Lechert, Jr., Stephen J.
Illumination
Photographic lighting
Safety or interlocks
362 15, 362227, G03B 1502
Patent
active
041308573
ABSTRACT:
A photoflash lamp array comprising a plurality of high voltage type flashlamps mounted on a printed circuit board containing circuitry for sequentially igniting the flashlamps in response to successive high voltage firing pulses applied thereto. A plurality of reflectors respectively associated with the flashlamps are disposed between the lamps and circuit board, with each reflector having an aperture in alignment with a corresponding aperture in the circuit board. Connected in series with each but the last lamp of the array is a radiant-energy-activated disconnect switch comprising a strip of electrically conductive heat shrinkable, polymeric material which is attached at both ends to the circuit board so as to bridge a respective one of the apertures therein. The circuitry further includes a plurality of radiant-energy-activated connect switches disposed on the circuit board in alignment with respective reflector apertures and each comprising a mass of high resistance material convertible to a conductive state upon being activated by radiant-energy. The high resistance material is also disposed on and about each of the ends of the disconnect switch strips, whereby the high resistance material provides mechanical protection for the disconnect switch ends and electrical insulation between the circuitry connected to and located adjacent these switch ends and the conductive reflectors and/or proximate circuitry. In making the circuit board, first the disconnect switch strips are mounted on a nonconductive substrate; then conductive ink is printed on the substrate in a desired circuit pattern and cured; then a paste of the high resistance material is printed on the substrate in a desired pattern of patches to provide both the connect switches and the areas of protection and insulation.
REFERENCES:
patent: 3935442 (1976-01-01), Hanson
Coleman Edward J.
GTE Sylvania Incorporated
Lechert Jr. Stephen J.
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