Automatic focus control device

Details Automatic focus control device Automatic focus control device

1991-04-25

1992-02-04

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

354408, G01J 120

Patent

active

050862170

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 calculation 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.

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patent: 4888609 (1989-12-01), Hamada et al.
patent: 4904854 (1990-02-01), Ishida et al.

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