Patent
1979-12-27
1981-05-19
Griffin, Donald A.
354 60R, 354242, G03B 708, G03B 934, G03B 908
Patent
active
042681529
ABSTRACT:
A control system for a camera controls a shutter release operation electromagnetically. A signal generating circuit produces a switching signal for operating a switching circuit which supplies current to a control circuit for a camera. The signal generating circuit is in a condition to always produce a switching signal when a camera operation member is set to normal photographing modes other than the bulb photographing mode, and is out of condition to produce the switching signal during the time between actuation of a magnet and termination of the shutter opening operation. The closing operation of the shutter is checked by means of a mechanical control member during the release when the camera operation member is set in the bulb photographing mode.
REFERENCES:
patent: 3303766 (1967-02-01), Karikawa et al.
patent: 3504601 (1970-04-01), Schubert
patent: 3821757 (1974-06-01), Kobori
patent: 3911449 (1975-10-01), Watanabe
patent: 3990089 (1976-11-01), Urano
patent: 4024553 (1977-05-01), Maitani et al.
Aizawa Hiroshi
Shimizu Masami
Suzuki Nobuyuki
Uchidoi Masanori
Urushibara Kazunobu
Canon Kabushiki Kaisha
Griffin Donald A.
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