Focus detecting device

Details Focus detecting device Focus detecting device

1998-04-13

2000-07-11

Perkey, W. B.

Photography

Having variable focal length of camera objective

Having focus operation

396 93, G03B 1700

Patent

active

060885378

ABSTRACT:
A focus detecting device of the kind using an area sensor which has a plurality of focus detecting areas necessitates setting a correction value for every one of the focus detecting areas and storing all the correction values thus obtained, whereas, according to the invention, the correction value for each of the focus detecting areas of the area sensor is obtained by an arithmetic operation using, as variables, two parameters indicative of the position of the area, so that a focus detecting device can be arranged to obviate the necessity of storing all the correction values for the respective focus detecting areas.

REFERENCES:
patent: 4843415 (1989-06-01), Matsui et al.
patent: 5347340 (1994-09-01), Tsukada

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