Apparatus for preventing malfunction of an electric shutter devi

Details Apparatus for preventing malfunction of an electric shutter devi Apparatus for preventing malfunction of an electric shutter devi

1980-03-03

1982-01-12

Franklin, Lawrence R.

354 51, 354238, 354268, 354 60L, G03B 1720

Patent

active

043102301

ABSTRACT:
Apparatus for preventing a malfunction of an electric shutter device is disclosed which comprises a source voltage detection circuit and a demagnetizing device connected with the output terminal of the detection circuit. The source voltage detection circuit produces a signal at its output terminal when the detected voltage is below a certain determined value. The device connected with the output terminal of the detection circuit is responsive to the signal to demagnetize the magnet of the shutter device.

REFERENCES:
patent: 4112446 (1978-09-01), Numata
patent: 4181417 (1980-01-01), Sugiura
patent: 4190344 (1980-02-01), Ishiguro

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