Focus detector system with a distortion compensation mask

Details Focus detector system with a distortion compensation mask Focus detector system with a distortion compensation mask

1985-06-27

1987-10-06

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250204, 354407, G03B 1328, G01J 120

Patent

active

046984925

ABSTRACT:
A focus detection system includes an object lens for focusing an image of an object, a refocusing optical system for refocusing a plurality of component image having parallax from the image of the image, a view field mask arranged between the object lens and the refocusing optical system and having a laterally extending aperture, and a sensing device having a photo-sensor array for sensing the component images. Focus detection error is prevented by determining a sense area of the photo-sensor array in accordance with a distortion created in an aperture image by the refocusing optical system.

REFERENCES:
patent: 4497561 (1985-02-01), Suzuki
patent: 4544255 (1985-10-01), Utagawa
patent: 4547663 (1985-10-01), Kitagishi et al.
patent: 4560863 (1985-12-01), Matsumura et al.
patent: 4567362 (1986-01-01), Kunz

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