Browse Prior Art Database

SOLID STATE ELECTRONIC IMAGE INPUT/OUTPUT SCANNER

IP.com Disclosure Number: IPCOM000025846D
Original Publication Date: 1988-Jun-30
Included in the Prior Art Database: 2004-Apr-04
Document File: 4 page(s) / 204K

Publishing Venue

Xerox Disclosure Journal

Abstract

A low cost solid state electronic scanner 3 for use in both digitizing documents and for converting digital information into an aerial image that is compatible with the xerographic process is shown in drawing Figures 1-3. Scanner 3 is a single device that can be used to enable electronic non-impact document digitizing and printing. Since scanner 3 is both an image input and output scanner, it may be conceived of as a solid state electronic image transceiver.

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SOLID STATE ELECTRONIC IMAGE INPUTIOUTPUT SCANNER US. C1.358/285 Craig S. Sellers

Proposed Classification

Int. C1. H04n 1/04

DAlVE

FIG. 7

COAOTRON

8

9

7

FIG. 3 VIDEO LIGHT/ OARK

OUTPUT

ADJUSTAILE

Volume 13 Number 3 May/June 1988 171

13

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

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SOLID STATE ELECTRONIC IMAGE INPUT/OUTPUT SCANNER

(Cont'd)

A low cost solid state electronic scanner 3 for use in both digitizing documents and for converting digital information into an aerial image that is compatible with the xerographic process is shown in drawing Figures 1-3. Scanner 3 is a single device that can be used to enable electronic non-impact document digitizing and printing. Since scanner 3 is both an image input and output scanner, it may be conceived of as a solid state electronic image transceiver.

The conventional method for electronic imaging of a photoreceptor is the laser based raster output scanner. While document reading capability can be added to a scanner of this type, current techniques using this approach result in a relatively high cost. The primary advantage of the solid state image transceiver approach shown here is a significant cost advantage in the long term over the conventional approach. Further, the transceiver should have a reliability advantage as well. It is estimated that scanner 3 could be currently produced in production quantities of 50,000 per year for approximately $250 with a 20% cost reduction per year thereafter.

Scanner 3 utilizes a dual function scan head 5 for selectively reading a document original 8 resting on a platen 9 (READ mode) or exposing the photoreceptor 10 of a xerographic system (WRITE mode). Scan head 5 has a linear high resolution light emitting diode array 6 with a lens such as a gradient index fiber lens array for focusing the light from the diode array 6 onto either the document 8 on a platen 9 or, in combination with a second lens array 7', onto the photoreceptor 10. A light receptor 12 in the form of an array of photodetectors 13 is also incorporated into the scan head 5, with fiber optic bundle 14 for transmitting light to photodetectors 13. While an array of photodetectors 13 is shown for light receptor 12, a light collector attached to a single photodetector may instead be used.

When operating in the WRITE mode, the target area is photoreceptor 10, and the individual diodes of the array 6 are switched in a manner to image the desired information onto the photoreceptor 10. In this operational mode, photodetectors 13 of the light receptor 12 are used to implement a retro- reflective toner density measurement device to provide a closed loop xerographic control system.

In the READ mode, to digitize document 8, scan head 5 is placed in the solid line position shown in Figure 1, with light emitting diode array 6 focused onto the document 8 on platen 9. Scanning movement is achieved by translating scan head 5 laterally. Other arrangements for effecting scanning such...