Browse Prior Art Database

TONER RIS - TRIPLE FUNCTION CONFIGURATION

IP.com Disclosure Number: IPCOM000024859D
Original Publication Date: 1982-Jun-30
Included in the Prior Art Database: 2004-Apr-04
Document File: 4 page(s) / 154K

Publishing Venue

Xerox Disclosure Journal

Abstract

Referring to Figure 1, a typical xerographic type copier includes a movable photoreceptor 5, a charge station 6 whereat the photoreceptor is uniformly charged in preparation for imaging, an exposure station 7 whereat the charged photo-receptor 5 is exposed via lens 9 to the document original being copied, a single development subsystem 10 for developing the latent electrostatic image on the photoreceptor, a transfer station 11 whereat the developed image is transferred to a copy sheet, and a cleaning station 12 whereat leftover developer is removed from the photoreceptor 5 preparatory to initiating the foregoing cycle again.

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Page 1 of 4

L 'EROX DISCLOSURE JOURNAL

TONER RIS - TRIPLE FUNCTION ~ ~~

CONFIGURATION Christopher Snelling

OUTPUK rt READ

Proposed Classification
U.S. C1. 358/285

Into C1. H04n 1/04

71''

V

/4 FIG: 2

- VIDEO OUTPUT

U

Volume 7 Number 3 May/June 1982 199

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

Page 2 of 4

TONER RIS - TRIPLE FUNCTION CONFIGURATION (Cont'd)

Referring to Figure 1, a typical xerographic type copier includes a movable photoreceptor 5, a charge station 6 whereat the photoreceptor is uniformly charged in preparation for imaging, an exposure station 7 whereat the charged photo- receptor 5 is exposed via lens 9 to the document original being copied, a single development subsystem 10 for developing the latent electrostatic image on the photoreceptor, a transfer station 11 whereat the developed image is transferred to a copy sheet, and a cleaning station 12 whereat leftover developer is removed from the photoreceptor 5 preparatory to initiating the foregoing cycle again.

In a multiple function machine, in addition to the copy operating mode described above, a raster output scanner (ROS) 14 which may comprise a high intensity beam 15 modulated in accordance with image signals, exposes the photoreceptor in a WRITE mode. For a READ mode, a raster input scanner (RIS) uses the same scanning beam 15 to scan (i.e., READ) the images developed on the photoreceptor (READ) and a light collector 17 is provided to collect light reflected from the photoreceptor and convert the same to video image signals.

To achieve the aforedescribed multiple modes (i.e., COPY, WRITE, READ), a dual cycle operation is used. This permits the existing scanning beam 15 to READ as well as WRITE. As a result, incremental system costs are likely to be less in this approach than that incurred with a second approach where a separate scanning system is added to permit the developed images to be READ at a point downstream of the development subsystem 10. For this second approach, the value added of full rate single cycle processing represents a trade-off against the added costs of a second scanning system with attendant system configuration latitude restraints.

The generic functions of the scanning beam are to expose an undeveloped photoreceptor (Le., WRITE) and to READ a developed photoreceptor respectively. These functions necessarily occur before or after development.

A third basic configuration option for triple functionality is suggested here wherein two selectively activated development subsystems 10, 20 are positioned before and after a single...