Focusing control and indication of information relating to an ob

Details Focusing control and indication of information relating to an ob Focusing control and indication of information relating to an ob

1987-09-17

1988-05-31

Perkey, W. B.

Facsimile and static presentation processing

Facsimile

Recording apparatus

354400, G03B 310

Patent

active

047485094

ABSTRACT:
A video camera with an optical system including a zoom lens system and a rear lens system provided therebetween wherein focusing is performed by varying the distance between the rear lens system and an imaging pickup device of the video camera. The video camera further includes a first sensor for sensing the position of the rear lens system to detect a relative distance between the rear lens system and the image pickup device, a second sensor for sensing the position of the zoom lens system to detect a focal length of the optical system. An arithmetic unit provided in the video camera calculates a distance to an object on the basis of the detected relative distance and the detected focal length and, in response to zooming operation, calculates a relative distance between the rear lens system and the image pickup device on the basis of the calculated distance to the object and the focal length detected by the second sensor. The arithmetic unit generates an error signal on the basis of the difference between the calculated relative distance and the relative distance detected by the first sensor and controls the position of the rear lens system on the basis of the generated error signal.

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