Patent
1988-12-30
1990-11-20
Adams, Russell E.
3541951, 354400, G03B 1336
Patent
active
049722212
ABSTRACT:
A camera including an imaging optical system and a focus detecting circuit for repeatedly performing a focus detection operation and outputting a focus signal representing the focusing state of the optical system at the time of each focus detection operation. A calculation circuit predicts, on the basis of previous and latest focus signals, the focusing state of the optical system a predetermined period of time after the detection of the latest focus signal. The predetermined period of time includes a shutter release time-lag. A driving circuit drives the optical system by an amount corresponding to the focusing state calculated by the calculation circuit. A releasing circuit begins a film exposure in response to the operation of a shutter release member. A release timing control circuit controls the releasing circuit so that it does not operate until a point of time which is earlier, by an amount equal to the release time-lag, than the predicted time.
REFERENCES:
patent: 4762986 (1988-08-01), Suda et al.
patent: 4783677 (1988-11-01), Hamada et al.
patent: 4786932 (1988-11-01), Akashi
patent: 4792819 (1988-12-01), Akashi
patent: 4792821 (1988-12-01), Akashi
patent: 4816856 (1989-03-01), Hamada et al.
Akashi Akira
Higashihara Masaki
Kadohara Terutake
Ohnuki Ichiro
Adams Russell E.
Canon Kabushiki Kaisha
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