Prewinding control device of camera

Details Prewinding control device of camera Prewinding control device of camera

1993-02-03

1995-05-09

Blankenship, Howard B.

G03B 118

Patent

active

054144825

ABSTRACT:
A pre-winding control device of a camera which continues pre-winding from where it left off after a power failure interruption and battery replacement. When a patrone is loaded in the camera, the total number exposures is read from the patrone and the read number of written to an electrically rewritable non-volatile memory E.sup.2 PROM. Subsequently, pre-winding for winding the film from the patrone to a spool is started. For every frame of film wound to the spool, the number of unexposed frames in the patrone is counted down and written to the E.sup.2 PROM. When pre-winding is interrupted due to battery replacement, pre-winding is continued based on the number of unexposed frames stored in non-volatile E.sup.2 PROM.

REFERENCES:
patent: 4598986 (1986-07-01), Shiratori et al.
patent: 4676621 (1987-06-01), Malloy Desormeaux
patent: 4910543 (1990-03-01), Kawamura et al.
patent: 4918474 (1990-04-01), Kawamura et al.

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