1982-06-24
1984-02-07
Gellner, Michael L.
354268, G03B 7087, G03B 1738
Patent
active
044299745
ABSTRACT:
In a camera of the type arranged to supply power to the circuits thereof by the first stroke of a release member and to perform a shutter release by the second stroke of the member, a timer circuit which is responsive to the first stroke causes a power supply device to continuously supply power for a predetermined period of time after the first stroke. A camera of this type is convenient because, once the first stroke is made, the timer circuit causes the power supply to be effected over a given length of time, so that the process of composing a picture and the like can be performed without continuously depressing the release member. However, even a momentary unintended contact of a finger with the release member, accidentally resulting in the first stroke thereof, renders the timer circuit operative causing wasteful power consumption. This problem is solved by a power supply device according to the present invention, which operates the timer circuit only when the first stroke operation on the release member persists for a prescribed period of time.
REFERENCES:
patent: 4387977 (1983-06-01), Uchidoi et al.
Canon Kabushiki Kaisha
Gellner Michael L.
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