Steered sum low cost auto focus system

Details Steered sum low cost auto focus system Steered sum low cost auto focus system

1980-12-04

1982-11-09

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

354 25, G01J 136

Patent

active

043586732

ABSTRACT:
Range finding equipment for use with optical systems utilizing a small number of radiation detectors positioned to receive radiation in first and second patterns from a remote object. The sum of the logarithm of the ratio of a first and second detector and the logarithm of the ratio of a third and fourth detector is compared with the difference between the logarithm of the ratio of the first and second detector and the logarithm of the ratio of the third and fourth detector to determine which has the greatest absolute magnitude. The signal of greatest magnitude is selected to operate the range finding circuitry.

REFERENCES:
patent: 4250377 (1981-02-01), Wilwerding
patent: 4309603 (1982-01-01), Stauffer

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