Patent
1994-04-26
1996-07-02
Perkey, W. B.
G03B 1336
Patent
active
055327818
ABSTRACT:
A focus detection device for an optical system which samples discrete areas of an image to determine focus adjustment. The discrete areas are either rectilinear or cross shaped. The rectilinear focus detection areas are inclined relative to the horizontal edge of the finder frame at an angle less than 30.degree. and preferably less than 20.degree., thus reducing the width of the vertical direction picture elements in the picture element row. This makes it possible to detect both vertical lines and horizontal lines. The cross shaped areas are arranged at central focus detection positions where conditions permit and rectilinear areas are arranged at positions along the horizontal edge of the finder frame. Using a combination of inclined rectilinear and cross shaped, areas traditionally difficult-to-handle objects can be detected to the extent possible in any area.
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Kusaka Yosuke
Utagawa Ken
Nikon Corporation
Perkey W. B.
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