Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1994-06-15
1996-04-09
Allen, Stephone
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
2502081, 250204, 354402, 354404, G01J 120
Patent
active
055063993
ABSTRACT:
A focus detection device is provided that can quickly detect small displacements with high precision in the optical image on arrays of photosensitive elements. The device includes a pair of arrays of photosensitive elements made of rectangular photosensitive elements arranged in a single line and positioned so that the boundary lines D between adjacent photosensitive elements are orthogonal to the direction in which the photosensitive elements are aligned. The boundary lines D are also inclined at a preset angle from the direction corresponding to vertical or horizontal lines in the image field. When the arrays of photosensitive elements and components peripheral to these arrays are solidly attached to a rectangular substrate, the arrays of photosensitive elements are positioned so that the direction in which the photosensitive elements are aligned is parallel to the sides of the perimeter of the substrate. Furthermore, the substrate is positioned so that the sides are inclined at a preset angle from the direction corresponding to vertical or horizontal lines in the image field.
REFERENCES:
patent: 4218623 (1980-08-01), Utagawa
patent: 4314150 (1982-02-01), Takayama et al.
patent: 4698492 (1987-10-01), Ohtaka et al.
patent: 5241168 (1993-08-01), Sensui
Allen Stephone
Nikon Corporation
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