Browse Prior Art Database

DETECTION AND FULL PAGE PURGING OF ROS LASER IMAGE DEFECTS

IP.com Disclosure Number: IPCOM000026768D
Original Publication Date: 1993-Aug-31
Included in the Prior Art Database: 2004-Apr-06
Document File: 6 page(s) / 234K

Publishing Venue

Xerox Disclosure Journal

Abstract

Imaging disturbances in ROS (raster output scanner) electrophotographic imaging system result in printed images containing image defects being delivered as customer job output without knowledge to the customer. These imaging disturbances results in a print defect that is 1 to 50 scan lines wide, creating an appearance that the image has been torn. An algorithm for responding to identifiable ROS errors so that defective prints are automatically discarded instead of being delivered to the customer is disclosed and shown in Figure 1. The algorithm or program checks various ROS functions and depending on their criticality and their impact to print quality, selects and rejects prints that are objectionable to the customer. Specifically, the disclosed method provides full page detection and purge of all defective prints that contain a single occurrence of a ROS imaging error. The system of detection and purge of the defective prints embedded in the algorithm prevents the prints from being delivered to the customer as job output. This method detects and purges the pages containing known types of ROS image defects affecting image integrity that include compressed scan line distortion, singled scan line deletion and inserting a single black scan line onto an image. The disclosed system of ROS runtime diagnostics software utilizes any single occurrence of an error as qualification for purging an output sheet.

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Page 1 of 6

XEROX DISCLOSURE JOURNAL

DETECTION AND FULL PAGE PURGING OF ROS LASER IMAGE DEFECTS Int. C1. G03g 21/00 Wilbert D. Douglas
Martin
E. Hoover

Proposed Classification

US. C1.355/205

ROS IS READY

1

&I

ACTIVATE START PRINT

RESET PURGED PAGE COUNTER

& FlG. I

    MAIN DRIVE STARTS/ OR CONTINUES AND THE SOFTWARE ENABLES/ OR MAINTAINS LASERWRITE ENABLE: DURING THE PRINTCYCLE THE IOT ROS SOFTWARE MONITORS THE MUX LINES FOR THE FOLLOWING

IMAGING TIME PROBLEMS.

FOR IMAGE INTEGRITY ERRORS, MONITOR:

OEOS MISSING *PIXEL CLOCK ERROR 0505 MISSING *VCO FAIL *XSOS/EOS

  IS HERE AN ERROR DETECTED ? NO I YES

I

1

CYCLE DOWN?

4WRITE ENABLE

4

I

1

SAMPLE TRAY. INCREMENT PURGE PAGE COUNTER.

J

QiiGEkiq OVER THRESHOLD? '\

i I

  PRINTER CYCLES DOWN

 POWER UP DIAGNOSTICS

IDISPLAY, MAX ROS PURGE FAULT CODE AND ANY

OTHER ROS

FAULT CODE

XEROX DISCLOSURE JOURNAL - Vol. 18, No. 4 July/August 1993 383

I

I I

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

Page 2 of 6

DETECTION AND FULL PAGE PURGING OF ROS LASER IMAGE DEFECTS (Cont'd)

b

\ PURGE TO OPTION SNV SET GOT0

ROS IS READY

    MAIN DRIVE STARTS/ OR CONTINUES AND THE SOFTWARE ENABLES/ OR MAINTAINS LASERWRITE ENABLE: DURING THE PRINTCYCLE THE IOT ROS SOFTWARE MONITORS THE MUX LINES FOR THE FOLLOWING

IMAGING TIME PROBLEMS.

ACTIVATE START PRINT

I

& I RESET PURGED PAGE COUNTER I

4 ,

-

TOPURGE OPTION SNV SET (2 I

 CYCLE DOWN?

4WRITE ENABLE

FOR IMAGE INTEGRITY ERRORS, MONITOR:

OEOS MISSING @PIXEL CLOCK ERROR 0505 MISSING OVCO FAIL OXSOSIEOS

IS THERE AN ERROR DETECTED ?

RESET PURGED PAGE COUNTER

IMAGE ERROR

COMPLETE?

SAMPLE TRAY. INCREMENT

IS PURGE PAGE COUNTER OVER THRESHOLD?

NO YES

I

I I

FIG. 2 I

.

384 XEROX DISCLOSURE JOURNAL - Vol. 18, No. 4 July/August 1993

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

Page 3 of 6

DETECTION AND FULL PAGE PURGING OF ROS LASER IMAGE DEFECTS (Cont'd)

/

FROM

FIG. 2

\

-1

P

I

,9

v

POWER UP

ACCOMPANY THE ROS PURGE FAULT?

   DISPLAY, MAX ROS PURGE FAULTCODE

OPTIONS TO

MAX ROS PURGE FAULT CODE

 AND ANY OTHER ROS

OPTION TO DO NOT

PURGE

CYCLES DOWN

PURGING FOR

12 Y

FIG. 3

XEROX DISCLOSURE JOURNAL - VO~. 18, NO. 4 July/August 1993 385

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

Page 4 of 6

DETECTION AND FULL PAGE PURGING OF ROS LASER IMAGE DEFECTS (Cont'd)

Imaging disturbances in ROS (raster output scanner) electrophotographic imaging system result in printed images containing image defects being delivered as customer job output without knowledge to the customer. These imaging disturbances results in a print defect that is 1 to 50 scan lines wide, creating an appearance that the image has been torn. An algorithm for responding to identifiable ROS errors so that defective prints are automatically discarded instead of being delivered to the customer is disclosed and shown in Figure 1. The algorithm or program checks various ROS functions and depending on their criticality and their impact to print quality, selects and rejects prints that are objectionable to the customer. Specifical...