Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1975-07-15
1976-05-18
Stolwein, Walter
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
250209, 250578, 356 4, 354 25, G01J 120
Patent
active
039581179
ABSTRACT:
A primary lens, which forms a primary image of an object on an image plane, is arranged to be positioned by a lens focusing motor. First and second auxiliary optical elements, which may be lenses or mirrors, produce respective first and second detection images of the object on respective first and second arrays of light sensors. One of these elements is reciprocated in continuously repeated periods or cycles to move its image back and forth continuously on the corresponding array. A signal processing circuit receives the outputs of the light sensors and produces a correlation pulse each time that the cycling element occupies the correlation position at which it brings the light distributions of the images into best correspondence on the respective arrays. The time and element position in each cycle at which this occurs are measures of the object distance. A circuit responds to the correlation pulse and to the relative positions of the cycling element and the primary lens, and controls the motor to make the final position of the primary lens correspond to the correlation position of the cycling element, this final position causing the primary image to be in best focus on the image plane. The relative positions of the cycling element and the primary lens are ascertained by magnetically actuated devices, by a mechanically operated switch, by a light operated switch, or by an arrangement which compares an element position signal to a primary lens position signal.
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Bodenstein George E.
Honeywell Inc.
Stolwein Walter
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