Exposure controlling circuit for electric shutters

Details Exposure controlling circuit for electric shutters Exposure controlling circuit for electric shutters

1978-05-08

1979-07-17

Goldberg, Gerald

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

For relays or solenoids

354 51, 354234, G03B 700, G03B 958

Patent

active

041617649

ABSTRACT:
An exposure controlling circuit for electric shutters incorporating therein a voltage drop detecting circuit which will issue a signal for passing a current to a coil for closing a shutter when a current source voltage becomes lower than a predetermined voltage in order to prevent the shutter closing motion from being made unable to be made by the drop of the current source voltage after the shutter is opened. This controlling circuit further includes a driving circuit for making an indication within the field of vision of the view finder of a photographic camera when a signal is issued from the voltage drop detecting circuit.

REFERENCES:
patent: 2978970 (1961-04-01), Fahlenberg
patent: 3579050 (1971-05-01), Basu et al.
patent: 4075648 (1978-02-01), Inoue et al.
patent: 4099195 (1978-07-01), Urano et al.
patent: 4115830 (1978-09-01), Stieber
patent: 4123766 (1978-10-01), Hasegawa
patent: 4126877 (1978-11-01), Ohtaki et al.

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