Camera, lens apparatus, and camera system

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

2005-02-15

2005-02-15

Perkey, W. B. (Department: 2851)

Photography

Having variable focal length of camera objective

Having focus operation

C396S091000, C396S133000, C348S347000

Reexamination Certificate

active

06856764

ABSTRACT:
A camera which drives a focusing lens to a target position in a short period of time while maintaining required stop accuracy in accordance with the status of an image-taking optical system, is disclosed. The camera comprises the image-taking optical system and a pulse generator that outputs pulse signals in accordance with movement of the focusing lens. A stop judging unit selectively carries out, in accordance with the status of the image-taking optical system, a first stop judgement of the focusing lens by detecting that the count value of pulse signals has reached a target count value, and a second stop judgement of the focusing lens by detecting that the output signal from the pulse generator does not change.

REFERENCES:
patent: 4509841 (1985-04-01), Sakai et al.
patent: 5839002 (1998-11-01), Miyake et al.
patent: 5887201 (1999-03-01), Maeno
patent: 7-77648 (1995-03-01), None

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