Camera system, camera and lens apparatus

Details Camera system, camera and lens apparatus Camera system, camera and lens apparatus

2005-05-10

2005-05-10

Perkey, W. B. (Department: 2851)

Photography

With exposure objective focusing means, focusing aid, or...

Lens drive circuit or motor structure

C348S345000

Reexamination Certificate

active

06892028

ABSTRACT:
A camera system which controls the driving of a focus lens through overlap control with a high degree of accuracy, is disclosed. The camera system comprises a lens apparatus with an image-taking optical system and a camera on which the lens apparatus is mountable. The camera system comprises a focus detection unit detecting a focusing state of the image-taking optical system, a driving unit driving the focus lens unit, and a controller controlling the driving speed of the focus lens unit and controls the focus detection unit to perform a focus detection operation at least once while the focus lens unit is moved. The controller sets the driving speed of the focus lens unit at the time of at least a final focus detection operation while it is moved toward an in-focus position, to a speed decelerated from the driving speed before the final focus detection operation.

REFERENCES:
patent: 4764787 (1988-08-01), Hamada et al.
patent: 4977457 (1990-12-01), Tamekuni et al.
patent: 5444510 (1995-08-01), Okano et al.
patent: 04-010051 (1992-01-01), None

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