Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1995-02-14
1996-09-03
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
250204, 359638, 354406, G02B 2740
Patent
active
055525946
ABSTRACT:
A focus detecting system for detecting focus state of an image forming optical system relative to an object, includes a beam splitter assembly for forming at least three coplanar two-dimensional images of a scene, each image having a different focus setting. An area array image sensor senses the images at the image forming plane. Signal processing electronics determine the sharpness of the three images and calculates an optimum focus setting for the optical system by deterring the variances of the three images and calculating a position of maximum variance corresponding to a best focus setting of the optical system.
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Dey Thomas W.
Olson James
Vandenberg Donald E.
Calogeno Stephen
Close Thomas H.
Eastman Kodak Company
Westin Edward P.
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