1979-04-05
1981-04-28
Gellner, Michael L.
354 60R, 354268, G03B 962, G03B 1738
Patent
active
042641764
ABSTRACT:
A device for preventing erroneous operation of a camera is disclosed. The device includes an electromagnet for closing the camera shutter. Current supply apparatus supplies current to the electromagnet. A detection device is employed for detecting whether current from the current supply device has been supplied to the electromagnet. The detection device produces a detection signal when the current is supplied to the electromagnet. A signal generation device has a switch which closes in response to the release operation wherein the signal generation device generates an electrical signal when it receives the detection signal from the detection device. A control device is included for generating a check signal and a release signal. The control device produces the check signal for a predetermined period of time only when it receives the electrical signal from the signal generation device to actuate the detection device. The control device generates the release signal when it receives the detection signal from the detection device. Finally, an electromagnet is included for opening the shutter which is actuated by the release signal from the control device so as to operate only when the current passage to the shutter control electromagnet is detected.
REFERENCES:
patent: 3435745 (1969-04-01), Fukushima
patent: 3938169 (1976-02-01), Kitai
patent: 4038675 (1977-07-01), Kitai et al.
Kawamura Masaharu
Shigeta Yoshihiro
Sugiura Yoji
Uchidoi Masanori
Yamamoto Hiroshi
Canon Kabushiki Kaisha
Gellner Michael L.
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