Focus detecting apparatus

Details Focus detecting apparatus Focus detecting apparatus

1985-05-30

1986-03-04

Adams, Russell E.

354408, G03B 300

Patent

active

045737843

ABSTRACT:
This specification discloses a focus detecting apparatus having an optical system for forming a plurality of object images on the basis of object lights passed through different pupil areas of an objective lens, and a sensor for putting out a plurality of data signals for the respective object images, wherein the amount of relative deviation of the object images is detected by a predetermined operation based on the data signal to thereby discriminate the focus state of the objective lens and wherein in the data signals put out from the sensor, the number of the data signals used for an operation is varied in accordance with the focus state or other condition of the objective lens.

REFERENCES:
patent: 4185191 (1980-01-01), Stauffer
patent: 4249073 (1981-02-01), Stauffer et al.
patent: 4250376 (1981-02-01), Joseph
patent: 4333007 (1983-06-01), Langlais
patent: 4368383 (1983-01-01), Shirasu et al.
patent: 4373791 (1983-02-01), Araki
patent: 4387975 (1983-06-01), Araki
patent: 4445761 (1984-05-01), Ishikawa et al.

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