Lens position control device

Details Lens position control device Lens position control device

1992-02-03

1993-06-29

Ben, Loha

Optical: systems and elements

Lens

With variable magnification

359696, 354400, 358227, G02B 1514

Patent

active

052239810

ABSTRACT:
An optical apparatus comprises a first lens arranged to be movable along an optical axis for a power varying action; a second lens arranged to be movable also along the optical axis for focusing and also for compensation during the power varying action, position detecting circuits for detecting the positions of the first and second lenses, a focus detecting circuit, and a control circuit for controlling the movement of the second lens on the basis of information obtained from the position detecting circuits and the focus detecting circuit when the power varying action is performed, the control circuit being arranged to vary a manner of control over the movement of the second lens according to whether or not the power varying action is in process in a case where the second lens is to be forcibly moved while the focus detecting circuit is inoperative.

REFERENCES:
patent: 5005956 (1991-04-01), Kaneda et al.
patent: 5027147 (1991-06-01), Kaneda
patent: 5060001 (1991-10-01), Kaneda

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