Motor drive apparatus for photographic camera

Details Motor drive apparatus for photographic camera Motor drive apparatus for photographic camera

1977-11-02

1980-02-26

Gellner, Michael L.

G03B 118

Patent

active

041903404

ABSTRACT:
A motor drive apparatus comprises phase switches adapted to assume a first state upon shutter release of a camera, to cause the film advancement to be started upon receipt of an exposure completion signal from the camera in the first state and to assume a second state upon completion of the film advancement to enable succeeding shutter release. A timer circuit is adapted to start counting time upon receipt of the exposure completion signal from the camera and to release a timer signal upon completion of counting after the lapse of a predetermined period. Release apparatus is adapted to generate a release signal during the second state of the phase switches and upon release of the timer signal from the timer circuit thereby causing the shutter release of camera to be started. The motor drive apparatus can avoid the influence of variation in the film advancing period in continuous photographing and achieve an always constant actual interval.

REFERENCES:
patent: 3813681 (1974-05-01), Sahara
patent: 4086603 (1978-04-01), Kozuki et al.

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