Automatic focusing apparatus

Details Automatic focusing apparatus Automatic focusing apparatus

1995-06-06

1997-09-02

Perkey, W. B.

Photography

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

Reliability of focus/distance signal

396128, G03B 1336

Patent

active

056642393

ABSTRACT:
A focus detecting apparatus that includes an optical system having a group of focusing lenses. An object distance measuring device measures a defocus amount for a specific object imaged by the optical system. A focus judging device determines a focus state in accordance with a measurement of the object distance measuring device. A lens driver then drives the focusing lens group to a focal position, in accordance with the amount of defocus, wherein the apparatus includes a controller for repeatedly operating the object distance measuring device and the lens driver. A moving object judging device determines that the specific object is a moving object when the focus judging device determines an out-of-focus state more than one time during the repeated operations.

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