Focus detector

Details Focus detector Focus detector

1999-06-08

2000-06-06

Perkey, W. B.

Photography

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

Reliability of focus/distance signal

396123, G03B 1336

Patent

active

060729562

ABSTRACT:
A focus detector used in an AF-SLR camera has a plurality of focusing sensors disposed not only in the center but also in a region distant from the center of the frame. A first focusing sensor group of the focusing sensors which are disposed in a first region where light flux passing through a pupil of a lens having an F-number larger than a predetermined F-number such as F2.8 is always used without reference to the F-number of the lens. A second focusing sensor group of focusing sensors which are disposed in a second region where light flux passing through a pupil of a lens having an F-number equal to or smaller than the predetermined F-number and having a higher accuracy for focus detection is used only when the F-number of the lens is equal to or smaller than the predetermined F-number.

REFERENCES:
patent: 5576797 (1996-11-01), Kusaka et al.
patent: 5659812 (1997-08-01), Uchiyama

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