Focus compensation linkage

Details Focus compensation linkage Focus compensation linkage

1981-09-17

1983-12-06

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

350 66, H04N 104

Patent

active

044195761

ABSTRACT:
A defocus compensation linkage arrangement automatically 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 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 proportional to the changing distance between the image source and the photodetector array.

REFERENCES:
patent: 4314154 (1982-02-01), Minoura et al.
patent: 4327959 (1982-05-01), Minoura et al.

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