Electric shutter means with battery checking circuit

Details Electric shutter means with battery checking circuit Electric shutter means with battery checking circuit

1975-05-06

1976-03-30

Hix, L. T.

354 60R, 354 60L, 354234, G03B 708

Patent

active

039478556

ABSTRACT:
An electric shutter means which comprises a voltage checking circuit connected to an exposure time control circuit including an electromagnet for controlling the time of closing shutter blades so that, when the voltage of a power source battery for said exposure time control circuit has dropped to be below a predetermined level, the passage of electricity to said electromagnet may be forcibly interrupted by said voltage checking circuit.

REFERENCES:
patent: 3646859 (1972-03-01), Umenura
patent: 3661062 (1972-05-01), Wisst
patent: 3812504 (1974-05-01), Wagensonner et al.

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