Focus detection device and method

Details Focus detection device and method Focus detection device and method

1995-05-24

1996-10-08

Perkey, W. B.

Photography

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

Plural focusing or rangefinding areas

396125, 396147, G03B 1336

Patent

active

055636780

ABSTRACT:
A focus detection device and method for a camera or the like detects focus adjustment conditions in a strip type focus detection areas. The areas do not contain an intersection of the image field and the optical axis of the photo-optical system but are radially and tangentially oriented with respect to concentric circles centered at the intersection. At least two strip-type areas are provided. The focus detection operation in a first focus detection area has a high accuracy of focus detection and a smaller chance for an eclipse to occur in the focus detection light rays. This area has priority over the focus detection operation of a second focus detection area. The device may also mathematically process the focus detection.

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