Focus detecting apparatus detecting focus to a plurality of area

Details Focus detecting apparatus detecting focus to a plurality of area Focus detecting apparatus detecting focus to a plurality of area

1994-01-18

1996-12-17

Perkey, W. B.

Photography

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

Plural focusing or rangefinding areas

396121, G03B 1336

Patent

active

055858821

ABSTRACT:
A focus detecting apparatus for receiving light energy passed through an objective and detecting the focus adjusted state is provided with defocus amount detection means for repetitively detecting the defocus amounts of a plurality of areas in a view relating to the objective, operating means for starting the defocus amount detecting operation of the defocus amount detection means, selection means for selecting at least one of the plurality of areas, discrimination means for discriminating whether the selected area is an area of a predetermined condition, prohibition means for prohibiting a new selecting operation of the selection means as long as it is discriminated by the discrimination means that the selected area is an area of a predetermined condition, and release means for releasing the prohibiting operation of the prohibition means by the release of the operation of the operating means.

REFERENCES:
patent: 4812868 (1989-03-01), Utagawa et al.
patent: 4812869 (1989-03-01), Akashi et al.
patent: 4857718 (1989-08-01), Karasaki et al.
patent: 4878079 (1989-10-01), Hamada et al.
patent: 4988856 (1991-01-01), Hamada et al.
patent: 5023646 (1991-06-01), Ishida et al.

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