Auto-focusing device

Details Auto-focusing device Auto-focusing device

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.

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