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A PARALLEL INPUT/OUTPUT ARRAY POSITION SENSOR

IP.com Disclosure Number: IPCOM000026135D
Original Publication Date: 1990-Aug-31
Included in the Prior Art Database: 2004-Apr-05
Document File: 2 page(s) / 118K

Publishing Venue

Xerox Disclosure Journal

Abstract

In an electrophotographic printing machine, it is necessary to precisely position components of the electrophotographic process. The precision positioning requirements are commonly met by utilizing an array detector device, such as a charge coupled device (CCD), as a precision ruler upon which a wide variety of features may be imaged. Characteristically, this type of device is comprised of an array of minute sensor sites, a charge coupled parallel transfer register and a method of serially clocking the photosite photon charge levels out of the device. The method of serially clocking the analog data out of the CCD results in a significant, and occasionally unsatisfactory, time delay within the positioning circuitry.

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XEROX DISCLOSURE JOURNAL

A PARALLEL INPUTIOUTPUT Proposed Classification ARRAY POSITION SENSOR U.S. C1.116/202 Stanley J. Wallace
Robert M. Lofthus
Stuart A. Schweid
William M. Lindenfelser
Alan D. Berger

Int. Cl. F21Q 3/00

18

XEROX DISCLOSURE JOURNAL - VOI. 15, NO. 4 July/August 1990 193

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A PARALLEL INPUT/OUTPUT ARRAY POSITION SENSOR(Cont'd)

In an electrophotographic printing machine, it is necessary to precisely position components of the electrophotographic process. The precision positioning requirements are commonly met by utilizing an array detector device, such as a charge coupled device (CCD), as a precision ruler upon which a wide variety of features may be imaged. Characteristically, this type of device is comprised of an array of minute sensor sites, a charge coupled parallel transfer register and a method of serially clocking the photosite photon charge levels out of the device. The method of serially clocking the analog data out of the CCD results in a significant, and occasionally unsatisfactory, time delay within the positioning circuitry.

Referring to the figure, a parallel output position sensor 2, having multiple photosites 4 comprising a photosite array 6 would accumulate photosite photon charge levels during exposure to light. The photosites would be individually connected to comparators 8 in comparator array 10 and would pass accumulated photon charge levels to the comparators....