Pupil divisional type focusing position detection apparatus for

Details Pupil divisional type focusing position detection apparatus for Pupil divisional type focusing position detection apparatus for

1995-03-20

1996-01-16

Yusko, Donald J.

Television

Camera, system and detail

Optics

348345, H04N 5232

Patent

active

054852099

ABSTRACT:
An apparatus for detecting a focus adjustment state of an objective lens includes a photoelectric converter, which has a photosensor array, for receiving a light beam transmitted through the objective lens. An area defining device defines different areas of a pupil of the objective lens, and is arranged so that light beams passing through the areas overlap each other on the photoelectric converter when the objective lens is at an in-focus state. A calculator calculates an autocorrelation from an output signal from the photoelectric converter.

REFERENCES:
patent: 3511156 (1970-05-01), Larks
patent: 4185191 (1980-01-01), Stauffer
patent: 4373791 (1983-02-01), Araki
patent: 4668991 (1987-05-01), Theuwissen et al.

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