Steered low cost auto focus system

Details Steered low cost auto focus system Steered 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

043586740

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 logarithm of the ratio of the output of a first and second detector are compared with the logarithm of the ratio of the output of a third and fourth detector to determine which has the largest absolute magnitude. The system operates to control the range finding circuitry with the largest signal thus obtained.

REFERENCES:
patent: 4103152 (1978-07-01), Stauffer
patent: 4309603 (1982-01-01), Stauffer
patent: 4331864 (1982-05-01), Nakajima et al.

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