Data recording photographic camera

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Details

354106, 354129, G03B 1724

Patent

active

044935471

ABSTRACT:
A data recording camera, which records information on unexposed film concomitant to taking a picture, uses a light source to record the information and for initiating a camera operation related to picture taking, such as firing an electronic flash. A photoelectric sensor in the camera, for example a phototransistor or a photodiode, responds to incident light from the light source and to the discontinuation of such light by undergoing respective electrical changes. A triggering element connected to the photoelectric sensor initiates the camera operation in response to the photoelectric sensor undergoing a particular one of its electrical changes. In the example of an electronic flash, a silicon controlled rectifier (SCR) is connected to the photoelectric sensor. The SCR renders the flash circuit conductive, to fire a flash tube in synchronization with opening of the camera shutter, in response to the photoelectric sensor undergoing an electrical change after the shutter uncovers the light source.

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patent: 4444479 (1984-04-01), Johnson et al.

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