Drive controlling circuit for electric shutters

Details Drive controlling circuit for electric shutters Drive controlling circuit for electric shutters

1980-06-23

1981-11-10

Adams, Russell E.

354273, 354289, G03B 1738

Patent

active

042994691

ABSTRACT:
A drive controlling circuit for electric shutters provided with a plurality of discriminating circuits for detecting failures and a plurality of warning circuits including buzzers or luminous diodes operated by the discriminating circuits in order that various failures of the shutter in use can be positively and quickly known. This controlling circuit makes impossible to release the shutter when something is wrong with the shutter.

REFERENCES:
patent: 3969735 (1976-07-01), Nobusawa
patent: 4024553 (1977-05-01), Maitani et al.
patent: 4034390 (1977-07-01), Urano et al.
patent: 4190344 (1980-02-01), Ishiguro et al.
patent: 4223987 (1980-09-01), Shimizu et al.

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