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Browse Prior Art Database

SCANNING SYSTEM FOR COPIER

IP.com Disclosure Number: IPCOM000024762D
Original Publication Date: 1981-Dec-31
Included in the Prior Art Database: 2004-Apr-03
Document File: 2 page(s) / 82K

Publishing Venue

Xerox Disclosure Journal

Abstract

The figure shows an optical system for scanning a document lying on a flat platen onto a curved photoreceptor drum, using optical components which compensate for the inherent field tilt caused by using a pivoting scan mirror.

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XEROX DISCLOSURE JOURNAL

SCANNING SYSTEM FOR COPIER Proposed David K. Shogren Classification

U.S. C1. 355/8

Int. C1. G03g 15/28

The figure shows an optical system for scanning a document lying on a flat platen onto a curved photoreceptor drum, using optical components which compensate for the inherent field tilt caused by using a pivoting scan mirror.

As shown in the figure, a document 10 lying on platen 12 is scanned by mirror 14

from segment A through B. An illumination source, not shown, illuminates the underside of the platen. Lens 16 projects the scanned image through moving slit 20 onto photoreceptor drum 18 Lens 16 is rotated in synchronism with the rotation of mirror 14 (relative to the optical axis) and the movement of slit 20 to maintain parallel object, lens and image planes to eliminate field tilt. During the scan cycle, however, the object-to-lens distance is changing due to two factors, the object to mirror distance L changing by L cos Y and the rotation of the lens causing an incremental change in the angular path of the principal ray. Since lens 16 has a fixed focal length, the above changes must be compensated for so as to maintain the total conjugate and keep the projected image in proper focus. This

Volume 6 Number 6 November/December 1981 377

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

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SCANNING SYSTEM FOR COPIER (Cont'd)

compensation is provided by adding mirror 40 which moves in the direction shown in conjunction with...