Optical equipment with lens position control utilizing zoom and

Details Optical equipment with lens position control utilizing zoom and Optical equipment with lens position control utilizing zoom and

1990-03-02

1991-06-25

Perkey, W. B.

3541951, 350429, 350255, G03B 500, G03B 1336, G02B 728, G02B 1514

Patent

active

050271474

ABSTRACT:
An optical equipment with a lens position control device for a zoom lens of inner focus type, enabling a faster focusing operation and also enabling focusing to an object of a very short distance, regardless of the initial state of the zoom lens. The equipment is provided with a first detector for detecting the zoom state, a second detector for detecting the focus state, and a controller varying the control of the zooming lens group and the focusing lens group according to the zooming state. When the focusing lens is to be moved to a position for focusing to a shorter distance, the controller drives the focusing lens group and the zooming lens group during the same time, only if the zooming lens group is at the wide angle side with respect to a predetermined zoom state, thus reducing the focusing time without a significant change in the image angle.

REFERENCES:
patent: 4920369 (1990-04-01), Kaneda et al.
patent: 4950054 (1990-08-01), Wada et al.

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