Method and apparatus for determining focus direction and amount

Details Method and apparatus for determining focus direction and amount Method and apparatus for determining focus direction and amount

1980-07-10

1982-06-01

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250204, 354 25, G01J 120

Patent

active

043330070

ABSTRACT:
A system for determining the range to an object utilizing a plurality of radiation responsive detectors arranged in groupings wherein a first grouping of detectors receives radiation from the object in a first pattern and the second grouping of detectors receives radiation from the object in a second pattern. The patterns move with respect to one another as the distance between the object and the system changes. The range is determined from a determination of the relative position of the patterns by computing where the patterns will coincide if the focusing lens of the system is moved. The output is a signal having a characteristic indicative of the desired direction of motion of the lens and a characteristic indicative of the amount of such motion necessary to produce a proper focus condition.

REFERENCES:
patent: 4083056 (1978-04-01), Nakamura et al.
patent: 4185191 (1980-01-01), Stauffer

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