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MAGNIFICATION VARIATION BY PRECESSION AND RECESSION

IP.com Disclosure Number: IPCOM000024676D
Original Publication Date: 1981-Aug-31
Included in the Prior Art Database: 2004-Apr-02
Document File: 2 page(s) / 81K

Publishing Venue

Xerox Disclosure Journal

Abstract

This disclosure is directed to the optical system of a photocopier which utilizes a scanning mirror to scan the information content of a stationary document lying in an object plane. The figure shows an optical system 10 which includes a scan mirror assembly 12 which includes a suitable linear light source (not shown). A second mirror 14 moves at a rate generally 1/2 that of the velocity of mirror 12 in order to maintain object conjugate. The reflected images from a document 16 are transmitted along optical path 18 and focused by lens 20 onto photoreceptor 22 via mirrors 24, 25. For this type of system, in a 1X magnification mode, the scan velocity (V) will equal the velocity of photoreceptor 22 and the exposed image length (L) on the photoreceptor will equal the document length (L),i.e. mag = L = 1.0.

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XEROX DISCLOSURE JOURNAL

MAGNIFICATION VARIATION BY PRECESSION AND RECESSION
T.E. Potter

Proposed Classification US. C1. 355/8
Int. C1. G03g 15/28

1

I

PWXORECEPTOR

/ VELOCITYCVI

This disclosure is directed to the optical system of a photocopier which utilizes a scanning mirror to scan the information content of a stationary document lying in an object plane.

The figure shows an optical system 10 which includes a scan mirror assembly 12 which includes a suitable linear light source (not shown). A second mirror 14 moves at a rate generally 1/2 that of the velocity of mirror 12 in order to maintain object conjugate. The reflected images from a document 16 are transmitted along optical path 18 and focused by lens 20 onto photoreceptor 22 via mirrors 24, 25. For this type of system, in a 1X magnification mode, the scan velocity
(V) will equal the velocity of photoreceptor 22 and the exposed image length (L)
on the photoreceptor will equal the document length (L),i.e.
mag = L = 1.0.

L

-

This system can be adapted to vary the magnification of the image without the normal requirement of increasing or decreasing the scanning speed with respect to photoreceptor speed. The magnification ratio can be controlled by the speed at which the exposure zone precesses (moves against the direction of photoreceptor motion) or recesses (moves with the direction). As shown in the figure, if mirror

Volume 6 Number 4 July/August 1981 195

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