Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1979-07-20
1981-02-10
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
250201, G01J 136
Patent
active
042503760
ABSTRACT:
Apparatus for determining the direction a lens should be moved in order to provide a proper focus of a remote object on a predetermined plane. A plurality of radiation detectors are positioned to receive radiation in first and second patterns from the object and to produce signals in accordance therewith. A first group of radiation detectors, produces signals indicative of the radiation received on the first pattern while a second group of radiation detectors produces signals indicative of the radiation received, in the second pattern. The two patterns coincide at the proper focus but at other than the proper focus position, the two patterns are spaced from one another in a direction which depends upon the direction the lens should be moved to achieve proper focus. The absolute value of the difference between the signal from a first detector in the first pattern and the signal from a first detector in the second pattern is compared with the absolute value of the difference between the signal from a second detector in the first pattern and the signal from a second detector in the second pattern. The result is summed over a predetermined range and a characteristic of the summed value is indicative of the direction the lens should be moved for proper focus.
REFERENCES:
patent: 4002899 (1977-01-01), Stauffer
patent: 4083056 (1978-04-01), Nakamura et al.
patent: 4132888 (1978-01-01), Kondo
patent: 4189232 (1980-02-01), Asano et al.
Joseph James D.
Wilwerding Dennis J.
Honeywell Inc.
Nelms David C.
Ungemach Charles J.
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