Optical apparatus with focus adjusting function and focus adjust

Details Optical apparatus with focus adjusting function and focus adjust Optical apparatus with focus adjusting function and focus adjust

2000-02-01

2000-12-05

Perkey, W. B.

Photography

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

Reliability of focus/distance signal

396123, G03B 1336

Patent

active

061577820

ABSTRACT:
An optical apparatus having a focus adjusting function, including: a focus detection unit for executing a focus detection operation for each of a plurality of focus areas set in an image plane; a grouping unit for grouping the image plane in accordance with a distribution of defocus amounts or distances obtained from focus detection results of the plurality of focus areas; a focus area selecting unit for selecting at least one focus area from the plurality of focus areas in accordance with a grouping result; a defocus amount comparing unit for comparing a defocus amount of the selected focus area selected with a predetermined defocus amount; a lens driving unit for driving a lens until the selected focus area is made in-focus, if a comparison result by the defocus amount comparing unit shows that the defocus amount of the selected focus area is smaller than the predetermined defocus amount; and a focus area re-selecting unit for re-selecting a focus area by driving the lens in accordance with the defocus amount of the selected focus area and thereafter again operating the focus detecting unit, the grouping unit, and the focus area selecting unit, if a comparison result by the defocus amount comparing unit shows that the defocus amount of the selected focus area is larger than the predetermined defocus amount.

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