Focus detecting system

Details Focus detecting system Focus detecting system

1979-03-27

1981-05-12

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

354 25, G01J 120

Patent

active

042674409

ABSTRACT:
The system is provided with an optical means capable of forming images obtained through a first light passage and a second light passage. A light detecting system is formed of a plurality of light responsive elements which receive the image. A focus detection signal is obtained by detecting the differential between the maximum and the minimum intensity of the light pattern or the maximum ratio of the maximum intensity to the minimum intensity using the electric output of the light responsive elements corresponding the light pattern of a composite image.

REFERENCES:
patent: 3762294 (1973-10-01), Kosaka et al.
patent: 4083056 (1978-04-01), Nakamura et al.
patent: 4178098 (1979-12-01), Asano et al.
patent: 4183640 (1980-01-01), Abe

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