Browse Prior Art Database

Optical Scheme for Improved Scanning of Toned Photoconductor

IP.com Disclosure Number: IPCOM000046508D
Original Publication Date: 1983-Jul-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 53K

Publishing Venue

IBM

Related People

Kerth, R: AUTHOR

Abstract

An improved scanning system is described which includes two lenses are added to compensate for irregularities in the surface to be scanned.

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Optical Scheme for Improved Scanning of Toned Photoconductor

An improved scanning system is described which includes two lenses are added to compensate for irregularities in the surface to be scanned.

The scanning system comprises a rotating mirror 10 positioned so that an input laser beam 12, incident upon the rotating mirror, is scanned across the surface of photoconductor 14. Each facet of mirror 10 produces one scan across photoconductor 14. An electrostatic image may be produced on the surface of the photoconductor by modulating a laser beam or by other means known in the art, and this electrostatic image may be toned by known means to produce a visible image 16.

The reflected light from the scanned laser beam striking the photoconductor surface is collected by a first lens 18 and directed through a second lens 20 to a line detector 22. The electrical output from detector 22 represents an electrical encoding of the image 16 and, as such, can be transmitted to a utilization device 24 at a remote location for use.

Should there be irregularities in the surface of photoconductor 14, such as bumps, dents or ripples, the reflected light may be diverted so that it does not reach detector 22. The first lens 18 is a cylindrical Fresnel lens that redirects the specularly reflected light from the photoconductor to a point on detector 22, as shown in the two figures below in which the normal path is shown in full line and the deviated path is shown in dashed line. Any h...