Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1979-09-13
1981-03-03
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
250204, G01J 120
Patent
active
042543304
ABSTRACT:
Apparatus for determining the direction a lens should be moved in order to provide a proper focus of a remote object on a predetermine 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 plurality of radiation detectors produces signals indicative of the radiation received in the first pattern while a second plurality 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 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 low frequency components in the patterns are determined by taking the sums of the outputs of groups of detectors in the first and second plurality of detectors so that individual fluctuations in individual detectors are smoothed. The absolute value of the difference between the summed signal from a first group in the first pattern and the summed signal from a first group in the second pattern is compared with the absolute value of the difference between the sum from a second group in the first pattern and the sum from a second group 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.
REFERENCES:
patent: 4002899 (1977-01-01), Stauffer
patent: 4078172 (1978-03-01), Wilwerding
Stauffer Norman L.
Wilwerding Dennis J.
Honeywell Inc.
Nelms David C.
Ungemach Charles J.
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