DEVICE FOR INDICATING CONDITION OF THE FILM IN TAPE TRANSPORT PATH OF PHOTOGRAPHIC APPARATUS Russian patent published in 1995 - IPC

FIELD: photography. SUBSTANCE: invention permits to solve the following problems; to indicate number of cycles of operation during period of time when the first to the third groups schedule operations are made; to release service personnel from determining terms of doing schedule operations from this or that groups; to inform of beginning of terms of operation of schedule operations from this or that group and of necessity of stopping aerial photography by means of specific aerial camera when they are failed to operate. Device has photoelectric detector 1, amplifier-former 2, frequency divider 3, pulse generator 4, three delay circuits 5-7, electron switches 5-7, electron key 16, indication unit 15, unit 17 of triggers, exposure unit 23, control unit 24, count unit 25, comparator 18, power amplifier 19, time relay 20, electric motor 21, pulse duration stretcher, decoders 26-29, memorizing units 30-32, frame set-point devices with encoders 33-40, coincidence circuits 41-48, photographic camera control desk 49. EFFECT: widened operational capabilities; simplified maintenance. 1 dwg