Automatic focus detecting device

Details Automatic focus detecting device Automatic focus detecting device

1988-11-04

1990-02-27

Adams, Russell E.

354407, 3541951, G03B 300

Patent

active

049050320

ABSTRACT:
An automatic focusing condition detecting device comprising an objective lens; a light receiving unit having a plurality of receiving portions, each receiving portion being adapted to receive through the objective lens light from one of a plurality of focusing areas, respectively; a focus detecting unit for detecting based on the output of each receiving portion a focusing condition of the objective lens in the respective focusing area; a unit for judging based on the output of each receiving portion whether or not it is possible for the focus detecting unit to detect a focusing condition of the objective lens in the respective focusing area; a unit for driving the objective lens; and a unit for controlling the driving unit to drive the objective lens when the judging unit judges that it is possible for the focus detecting unit to detect a focusing condition in at least one but not whole of the focusing areas, for the purpose of investigation whether or not there is another focusing area where the focus detecting unit can detect a focusing condition.

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