Focus detecting system

Details Focus detecting system Focus detecting system

1983-11-14

1986-02-04

Adams, Russell E.

354406, G03B 310

Patent

active

045681686

ABSTRACT:
This specification discloses improvements in the so-called sharpness detection type algorism in which three light receiving means are provided near a predetermined focal plane and forwardly and rearwardly thereof to quantitatively detect the out-of-focus relative to the predetermined focal plane and the sharpnesses of the images at the positions of the three light receiving means are detected. More particularly, it discloses a technique whereby the range in which the amount of in-focus error can be detected is increased by using as a signal for normalizing an error signal a signal indicative of the difference between the sharpness of the image on the light receiving means disposed near the predetermined focal plane and the smaller one of the sharpnesses of the images on the light receiving means at the opposite ends.

REFERENCES:
patent: 4132888 (1979-01-01), Kondo
patent: 4341953 (1982-07-01), Sakai et al.
patent: 4349254 (1982-09-01), Jyojiki et al.
patent: 4429966 (1984-02-01), Hosoe et al.
patent: 4453818 (1984-06-01), Hayashi et al.
patent: 4459006 (1984-07-01), Sakai et al.
patent: 4465352 (1984-08-01), Hirobe et al.

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