Apparatus for detecting an in-focused condition of optical syste

Details Apparatus for detecting an in-focused condition of optical syste Apparatus for detecting an in-focused condition of optical syste

1979-10-19

1982-05-25

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

354 25, G01J 136

Patent

active

043318649

ABSTRACT:
An apparatus for detecting an in-focused condition of optical systems by using two values of indices of performance each derived from the number of differences between illumination signals obtained per picture element, comprising first and second image sensors arranged in front of and in the rear of a focal plane of the optical system, first and second analog data processing circuits, and a comparing means.

REFERENCES:
patent: 3875401 (1975-04-01), Stauffer
patent: 4185191 (1980-01-01), Stauffer
patent: 4203031 (1980-05-01), Kamachi et al.

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