Controlling circuit for electric shutters

Details Controlling circuit for electric shutters Controlling circuit for electric shutters

1977-09-30

1979-03-13

Hix, L. T.

354234, G03B 1740

Patent

active

041439589

ABSTRACT:
A controlling circuit for electric shutters wherein, in an electric shutter adapted to start a shutter closing moton by energizing a driving coil with a discharge current from a capacitor, the capacitor is made to be discharged by a voltage drop detecting circuit provided so that the shutter may be positively closed even in case a current source switch is opened by an unexpected accident in the course of an exposure controlling operation.

REFERENCES:
patent: 3160795 (1964-12-01), Aune
patent: 3886443 (1975-05-01), Miyakawa et al.
patent: 3947855 (1976-03-01), Inoue et al.
patent: 3947858 (1976-03-01), Ishida
patent: 3953867 (1976-04-01), Kondo
patent: 3980400 (1976-09-01), Maida
patent: 4024553 (1977-05-01), Maitani et al.

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