Focus compensation linkage

Details Focus compensation linkage Focus compensation linkage

G - Physics

02

B

350/32, 88/96.8

G02B 27/00 (2006.01) G02B 7/32 (2006.01) H04N 1/113 (2006.01)

Patent

CA 1191372

ABSTRACT OF THE DISCLOSURE A defocus compensation linkage arrangement auto- matically corrects for the defocussing of the converging viewing lens onto a photodetector in a rotational optical scanning system wherein the distance between the photodetector and the source of the image varies during the rotational scan. This is achieved by a mechanical feed forward arrangement that effectively tracks the distance between the lens system and the photodetector array as rotational movement of the scanner and continuously adjusts the distance between the lens system and the photodetector array as rotational movement proceeds. The defocus compensation linkage comprises a rotational-to-linear translator arrangement that responds to the rotation of the scanning optics about a fixed axis of rotation and moves the lens by an amount propositional to the changing distance between the image source and the photodetector array.

411611

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