Browse Prior Art Database

REGISTRATION OF ELECTRONIC IMAGE TO COPY MEDIA

IP.com Disclosure Number: IPCOM000027011D
Original Publication Date: 1994-Dec-31
Included in the Prior Art Database: 2004-Apr-07
Document File: 4 page(s) / 175K

Publishing Venue

Xerox Disclosure Journal

Abstract

Image registration in an electronic printer is accomplished by detecting the side or lead edge of the copy media and registering an electronic image so that it is exposed, developed and transferred to the media at a desired registered position. Registration is typically accomplished by using detecting means such as an imaging device 4 shown in Figure 1 in a printing system generally indicated by the numeral 6. System 6 includes an exposure station 8 where a Raster Output Scanner (ROS) 10 exposes the surface of a photoreceptor drum 12 with scan lines modulated in response to image input signals to the ROS. The latent image formed on the photoreceptor surface is developed at a conventional developer station and the developed image transferred to a copy media fed from a media tray 14. A copy sheet 16 is shown being fed from the tray by roller pair 18 along the top surface of a transport belt 19. Imaging device 4 detects the leading edge of sheet 16 and generates output signals which are processed and are fed back to the ROS as correction signals to control the image exposure as described in further detail below. The transferred image is fixed at fuser 22 and conveyed to a catch tray 24. The photoreceptor surface is cleaned and recharged by conventional means.

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Page 1 of 4

XEROX DISCLOSURE JOURNAL

REGISTRATION OF ELECTRONIC Proposed Classification IMAGE TO COPY MEDIA
Richard E. Butts
Michael J. McVeigh

U.S. C1.346/160 Int. C1. Gold 15/14

Pixel Clock

r [FastScan Direction]

  Registration Reference Device

1 . Error Correcting + Circuitry

30

.

Corrected Pixel Clock
[FastScan Direction]
4

I

Corrected

Page Sync Signal [SlowScan Direction]

I

FIG. I

XEROX DISCLOSURE JOURNAL - Vol. 19, No. 6 NovembedDecernber 1994 461

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

Page 2 of 4

REGISTRATION OF ELECTRONIC IMAGE TO COPY MEDIA(Cont'd)

I FIG. 2A

1

16

16'

FIG. 26

19

462 XEROX DISCLOSURE JOURNAL - Vol. 19, No. 6 November/December 1994

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

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REGISTRATION OF ELECTRONIC IMAGE TO COPY MEDIA(Cont'd)

Image registration in an electronic printer is accomplished by detecting the side or lead edge of the copy media and registering an electronic image so that it is exposed, developed and transferred to the media at a desired registered position. Registration is typically accomplished by using detecting means such as an imaging device 4 shown in Figure 1 in a printing system generally indicated by the numeral 6. System 6 includes an exposure station 8 where a Raster Output Scanner (ROS) 10 exposes the surface of a photoreceptor drum 12 with scan lines modulated in response to image input signals to the ROS. The latent image formed on the photoreceptor surface is developed at a conventional developer station and the developed image transferred to a copy media fed from a media tray 14. A copy sheet 16 is shown being fed from the tray by roller pair 18 along the top surface of a transport belt 19. Imaging device 4 detects the leading edge of sheet 16 and generates output signals which are processed and are fed back to the ROS as correction signals to control the image exposure as described in further detail below. The transferred image is fixed at fuser 22 and conveyed to a catch tray 24. The photoreceptor surface is cleaned and recharged by conventional means.

Referring again to Figures 2A, 2B, an expanded view of imaging device 4 shows one possible configuration. An illumination source, such as an elongated lamp 24, is positioned in close proximity to the plane of the cut sheet 16 path so as to direct the uniform beam of illumination against the top of the sheet as it moves therepast. Light is reflected upward from the sheet and transmitted through a linear gradient index lens array 26. Array 26 focuses the line image onto a CCD sensor array 28. The configuration of detector 4 is designed to Yook" for the lead corner edge 16D of the copy sheet 16. Upon detection of the registration edge 16A, an analog output signal from array 28 is converted to...