Focus detection apparatus

Details Focus detection apparatus Focus detection apparatus

1983-09-28

1985-02-05

Adams, Russell E.

354408, G03B 310

Patent

active

044975619

ABSTRACT:
A focus detection apparatus has at the rear side of an objective lens an imaging means which re-projects a first image of an object formed on the imaging plane as a plurality of second images of the object. The apparatus also has a light-receiving means which detects the relative positional relationship between the second images of the object so as to discriminate the focusing state of the objective lens. The light-receiving planes of the light-receiving means are shaped in the form of sine waves such that the outputs from the light-receiving means corresponding to the respective second object images become Fourier transforms.

REFERENCES:
patent: 3875401 (1975-04-01), Stauffer
patent: 4253752 (1981-03-01), Ichihara
patent: 4264810 (1981-04-01), Utagawa et al.

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