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OPTICAL COMPENSATOR

IP.com Disclosure Number: IPCOM000024367D
Original Publication Date: 1980-Jun-30
Included in the Prior Art Database: 2004-Apr-02
Document File: 2 page(s) / 55K

Publishing Venue

Xerox Disclosure Journal

Abstract

In a xerographic device for copying documents by optical imaging between a document, which is transported by some mechanical means and a photoreceptor drum driven by a separate mechanical means, it is common to drive the original by a servo motor which is phase locked to an encoder signal generated on the drum shaft. If error signals from the encoder cannot be tracked by the document drive system, llskipsll or other distortions in the reproduction will occur.

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XEROX DISCLOSURE JOURNAL

OPTICAL COMPENSATOR Edward J. Gunzelmann
H. Michael Tenney David 0. Kingsland

Proposed Classification
U.S. Cl. 355/8 Int. C1. G03g 15/28

In a xerographic device for copying documents by optical imaging between a document, which is transported by some mechanical means and a photoreceptor drum driven by a separate mechanical means, it is common to drive the original by a servo motor which is phase locked to an encoder signal generated on the drum shaft. If error signals from the encoder cannot be tracked by the document drive system, llskipsll or other distortions in the reproduction will occur.

The problem of image distortions can be corrected as follows: those frequencies of the encoder signal, which the document transport system cannot follow, are filtered out and applied to an optical device in the optical path between the document and the photoreceptor drum which compensates for them. An example of such an optical device is a tiltable mirror whose axis of rotation is parallel to the axis of the drum. The mirror is activated electromechanically to provide motion of the aerial image which compensates for the asynchronism between the motion of the document and the photoreceptor.

Volume 5 Number 3 May/June 1980 277

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 XEROX DISCLOSURE JOURNAL Volume 5 Number 3 May/June 1980

278

[This page contains 1 picture or other non-text object]