Device for detecting focus at different areas of an image field

Details Device for detecting focus at different areas of an image field Device for detecting focus at different areas of an image field

1994-06-27

1995-02-28

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

354407, G01J 120

Patent

active

053939697

ABSTRACT:
A focus state detecting device of divided-pupil phase difference system, having plural distance measuring areas, in which photosensors are provided respectively corresponding to the distance measuring areas in the image field in order to effect focus state detection in the plural distance measuring areas, and at least a part of the photosensors are constructed as an independent unit separate from others, whereby optical adjustment is rendered possible independently in each distance measuring area.

REFERENCES:
patent: 4387975 (1983-06-01), Araki
patent: 4562345 (1985-12-01), Aoki
patent: 4878079 (1989-10-01), Hamada et al.

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