Browse Prior Art Database

LASER SENSING OF LATENT IMAGE

IP.com Disclosure Number: IPCOM000024825D
Original Publication Date: 1982-Apr-30
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 71K

Publishing Venue

Xerox Disclosure Journal

Abstract

In the arrangement shown in Figure 1, a xerographic image is scanned by a line scanning beam 6. Beam 6 is derived from a laser 7 which (following suitable processing by optical section 8) is scanned across the surface of photoreceptor 5 for a suitable scanning element such as a rotating polygon 9. Light reflected from the surface of photoreceptor 5 is collected by an integrating cavity I1 and converted to image signals by photodetector 12. As a result, an input image scanner using components from an existing copy machine is provided.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 90% of the total text.

Page 1 of 2

XEROX DISCLOSURE JOURNAL

LASER SENSING OF LATENT IMAGE Proposed Richard H. Tuhro Classification

U.S. C1. 358/285

Int. C1. H04n 1/04

t2

VI D&euroO DATA 4

9

XAN MOTOR

FIG. 2

Volume 7 Number 2 March/April 1982 119

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

Page 2 of 2

LASER SENSING OF LATENT IMAGE (Cont'd)

In the arrangement shown in Figure 1, a xerographic image is scanned by a line scanning beam 6. Beam 6 is derived from a laser 7 which (following suitable processing by optical section 8) is scanned across the surface of photoreceptor 5 for a suitable scanning element such as a rotating polygon 9. Light reflected from the surface of photoreceptor 5 is collected by an integrating cavity I1 and converted to image signals by photodetector 12. As a result, an input image scanner using components from an existing copy machine is provided.

An improvement which eliminates several of the extra components shown in Figure 1 is shown in Figure 2. There, the latent image on photoreceptor 5 is scanned before development, scanning by beam 6 discharging the image. The change in surface potential, as the photorecptor 5 is discharged, is measured by an electrode 14 is close proximity to the photoreceptor 5 at the scanning point. Electrode 14 could take several forms, e.g., a fine wire, an array of electrometers, etc.

Alternately, the latent image on photoreceptor 5 could be developed, then recharged, and then laser beam discharged. As a result, the laser beam 6 could...