Focusing device for driving focusing lens group according to a p

Details Focusing device for driving focusing lens group according to a p Focusing device for driving focusing lens group according to a p

1992-07-17

1993-07-27

Gellner, Michael L.

35419512, G03B 310

Patent

active

052314413

ABSTRACT:
A lens controller comprises a focusing device for driving a focusing lens group; a zooming device for driving a zoom lens group; a focusing position detector for detecting the position of the focusing lens group on an optical axis; a zoom position detector for detecting the position of the zoom lens group on the optical axis corresponding to a focal distance thereof; a calculating device for respectively receiving outputs of the zoom and focusing position detectors and calculating a correction amount with respect to a shift in position of a formed image after the zoom lens group is driven by the zooming device; a control device for receiving the correction amount and controlling the operation of the focusing device such that the focusing lens group is moved to a focusing position with respect to the focal distance thereof; a device for judging whether or not the focusing lens group is located in inhibit regions on infinite and proximate sides respectively formed within a predetermined distance in a direction from an infinite position to a proximate position and in a direction from the proximate position to the infinite position; and a device for receiving an output of the judging device and inhibiting the focusing lens group from being moved in the directions toward the infinite and proximate positions when the focusing lens group is respectively located in the inhibit regions on the infinite and proximate sides.

REFERENCES:
patent: 4733264 (1988-03-01), Hatase et al.
patent: 4763154 (1988-08-01), Iguchi et al.
patent: 4777505 (1988-10-01), Hata et al.
patent: 4825237 (1989-04-01), Hatase et al.
patent: 4831405 (1989-05-01), Hata et al.
patent: 4899190 (1990-02-01), Hata

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