Electronic focal plane shutter

Details Electronic focal plane shutter Electronic focal plane shutter

1986-01-28

1987-05-12

Gellner, Michael L.

354244, G03B 710, G03B 934

Patent

active

046644946

ABSTRACT:
A photographic shutter includes first and second curtains having opaque portions terminating at first and second edges which are positionable in spaced relation to define an exposure slit. Rollers support the curtains for movement of the slit in a certain path and through an exposure region. Electrical servo motors drive the curtains to control the width of the slit and to move the slit through the exposure region. A digital control circuit develops a command signal for control of movement of the slit through the exposure region. A drive circuit controls the servo motors in accordance with the command signal to obtain a certain velocity of movement of said slit at each position of said slit in said exposure region.

REFERENCES:
patent: 3554106 (1971-01-01), Baumgarten
patent: 3577901 (1971-05-01), Gray

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