G - Physics – 03 – B
Patent
G - Physics
03
B
95/53.3
G03B 15/05 (2006.01)
Patent
CA 1084757
ABSTRACT OF THE INVENTION An electronic flash accessory is provided for a camera of the type having a flash socket assembly adapted for receipt of a conventional multiple flash bulb array together with circuitry for sampling the terminals of the flash socket which are adapted to connect to the last flash bulb scheduled to be fired in the array and for providing a signal which operates to inhibit camera operation when the sampled impedance of the last flash bulb scheduled to be fired is substantially different from the impedance of an unfired non-defunct flash bulb. The electronic flash accessory includes circuitry responsive to a predetermined event relative to the readying of the flash accessory in expectation of the commencement of a photographic exposure cycle involving an artificially illuminated subject for simulating the impedance of an unfired non-defunct flash bulb in order to enable the camera to automatically perform a photographic exposure cycle upon actuation by the camera operator.
279747
Polaroid Corporation
Smart & Biggar
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