Automatic focus control device having a plurality of focus detec

Details Automatic focus control device having a plurality of focus detec Automatic focus control device having a plurality of focus detec

1989-12-27

1991-09-17

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

2502018, 354408, G01J 120

Patent

active

050497316

ABSTRACT:
An automatic focus control device including a plurality of photo-sensors corresponding, respectively, to a plurality of focus detecting regions, an optical system for guiding light to the photo-sensors, a first calculating device for calculating first defocus amounts upon reception of signals from the photo-sensors, respectively, a storage for storing deviation amounts in a direction of an optical axis for the focus detecting regions, respectively and a second calculating device for calculating second defocus amounts corrected on the basis of the first defocus amounts and the deviation amounts, respectively.

REFERENCES:
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patent: 4772912 (1988-09-01), Ishida et al.
patent: 4792668 (1988-12-01), Akashi et al.
patent: 4831403 (1989-05-01), Ishida et al.
patent: 4835615 (1989-05-01), Taniguchi et al.
patent: 4857720 (1989-08-01), Karasaki
patent: 4888609 (1989-12-01), Hamada et al.

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