1982-08-20
1984-06-12
Gellner, Michael L.
354484, 3542382, G03B 310, G03B 7093
Patent
active
044538120
ABSTRACT:
The present invention relates to auto-focus devices for cameras. In the camera having an auto-focus device, initiation of exposure is deferred pending termination of a distance adjusting operation by the auto-focus device. The aforesaid sequence assures that distance adjusting is completed before the exposure starts, provided that operation is normal. But when the distance adjusting operation is not motivated, it results not only in an exposure not starting, but also in current flow to the auto-focus circuit being retained and thus electrical energy is wastefully consumed. The present invention has been made by consideration of this point. When the auto-focus device does not complete a distance adjusting operation in a prescribed time, the actuation of the auto-focus device stops, thus preventing wasteful consumption of electrical energy.
REFERENCES:
patent: 4350418 (1982-09-01), Taguchi et al.
Suzuki Ryoichi
Tokuda Ryuji
Canon Kabushiki Kaisha
Gellner Michael L.
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