Photography – With exposure objective focusing means – focusing aid – or... – Having pursuit mode
Patent
1995-10-23
1996-11-12
Perkey, W. B.
Photography
With exposure objective focusing means, focusing aid, or...
Having pursuit mode
396 96, G03B 1336
Patent
active
055745350
ABSTRACT:
An auto-focusing device for stably driving a photographing lens to track a moving object comprises a charge accumulation type photo-electric conversion device for accumulating charges at a predetermined time interval to produce a focus detection signal, a defocus amount calculation device for calculating a defocus amount of the photographing lens based on the focus detection signal, a drive distance calculation device for calculating a direction and a distance of the lens drive for driving the photographing lens to track the moving object based on at least the defocus amount, a drive device for driving the photographing lens in accordance with the calculated direction and distance of the lens drive, and a control device for supplying the direction and distance of the lens drive calculated by the drive distance calculation device to the drive device after the end of the next charge accumulation by the photo-electric conversion device to drive the photographing lens so that the photographing lens tracks the moving object.
REFERENCES:
patent: 4783677 (1988-11-01), Hamada et al.
patent: 5179407 (1993-01-01), Kusaka et al.
Nikon Corporation
Perkey W. B.
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