Distance information judging circuit for focus detecting apparat

Details Distance information judging circuit for focus detecting apparat Distance information judging circuit for focus detecting apparat

1979-09-18

1981-05-26

Hix, L. T.

Optics: measuring and testing

Range or remote distance finding

With photodetection

356 4, G03B 310

Patent

active

042694914

ABSTRACT:
A distance information judging circuit for focus detecting apparatus comprises memory means for storing a distance information signal obtained from the focus detecting apparatus for each scan of an optical system,, and coincidence signal generating means adapted for comparing the distance information signal obtained from the focus detecting apparatus in a succeeding scan of the optical system with the distance information signal stored in the memory means and for generating a coincidence signal when the distance information signals coincide each other.

REFERENCES:
patent: 3211831 (1965-10-01), Steiner
patent: 3896304 (1975-07-01), Aoki et al.
patent: 4135815 (1979-01-01), Masunaga et al.

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