Optical apparatus

Details Optical apparatus Optical apparatus

1990-11-06

1993-04-27

Gellner, Michael L.

G03B 1300

Patent

active

052066770

ABSTRACT:
An optical apparatus comprises an optical system in which an amount of movement of an image forming plane varies according to the movement of a specific lens in the direction of an optical axis thereof, a driving unit for driving a focusing lens, a computing unit for obtaining sensitivity information concerned with an amount of movement of the image forming plane relative to a predetermined driving degree of the specific lens, a focus detector and a control unit for controlling a driving speed of the focusing lens as driven by the driving unit on the basis of focus information detected by the focus detector and sensitivity information obtained by the computing unit. The control unit causes the driving unit to drive the focusing lens at a first speed, then at a second speed which is lower than the first sped and then stops the focusing lens, the control unit varying the second speed according to the sensitivity information.

REFERENCES:
patent: 4894676 (1990-01-01), Ohnuki et al.
patent: 4972221 (1990-11-01), Ohnuki et al.
patent: 4974003 (1990-11-01), Ohnuki et al.

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