Data recording apparatus for camera

Details Data recording apparatus for camera Data recording apparatus for camera

1992-12-14

1995-06-06

Blankenship, Howard B.

3541731, G03B 1724

Patent

active

054226945

ABSTRACT:
A camera for recording photographing data on a photographic film during one frame advancement of the film. During advancement, an encoded disk rotates with a driven roller in contact with the film. A photo-interrupter generates an ENC pulse each time the encode disk rotates through a predetermined angle, and supplies it to a microcomputer. Each time the microcomputer receives an ENC pulse, it measures a pulse period between a previously generated ENC pulse and presently generated ENC pulse. In accordance with the measured pulse period, a predicated pulse period between the presently generated ENC pulse and a next ENC pulse is calculated. N timings are obtained by dividing the predicted pulse period to record N-bits of data on the film during the predicted period by driving a recording head N times.

REFERENCES:
patent: 4864332 (1989-09-01), Harvey
patent: 5021820 (1991-06-01), Robinson et al.
patent: 5023656 (1991-06-01), Terashita
patent: 5184161 (1993-02-01), Egawa

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