Photography – Having variable focal length of camera objective – Having focus operation
Patent
1997-06-10
1998-08-18
Perkey, W. B.
Photography
Having variable focal length of camera objective
Having focus operation
396 95, G03B 1336
Patent
active
057970483
ABSTRACT:
An automatic focusing device for a camera capable of accommodating an interchangeable zoom lens which prevents inadvertently performing a moving subject tracking lens drive control when the zoom lens causes focus shift as a result of a zooming operation. The automatic focusing device operates in a first drive mode in which movement of the subject in the optical axis direction is detected and the moving subject is tracked by providing compensation for the drive amount of the lens according to the movement of the subject, and a second drive mode in which movement of the subject in the optical axis direction is not detected and compensation for the drive amount of the lens is not provided. A determination that the zoom lens causes focus shift during a zooming operation is made when the object distance is within a specified distance range, and a focus shift signal is output when focus shift will occur. An inhibition device inhibits the lens drive in the first lens drive mode in response to the focus shift signal.
REFERENCES:
patent: 4783677 (1988-11-01), Hamada et al.
Shiokama Yoshiharu
Yasukawa Seiichi
Nikon Corporation
Perkey W. B.
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