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OPTICAL SYSTEM FOR IMAGING DOCUMENTS ONTO A PHOTOSENSOR ARRAY

IP.com Disclosure Number: IPCOM000024441D
Original Publication Date: 1980-Aug-31
Included in the Prior Art Database: 2004-Apr-02
Document File: 2 page(s) / 125K

Publishing Venue

Xerox Disclosure Journal

Abstract

Array 12 begins reading out its portion of line 1 (first line A) after a time delay, which provides a time overlap, t , such that the last elements from array 10 &e A) output simultaneously with 8 e corresponding first elements of array 12 (line A); i.e., the element in the overlap region of array 10 which contains the signal from a specific pixel on document scan line A and the element of array 12 containing the signal from the document pixel are outputted simultaneously, so they may be added in real time. Array 12 then continues to read out its portion of successive document lines in the same manner as array 10, except for the initial delay.

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XEROX DISCLOSURE JOURNAL

OPTICAL SYSTEM FOR IMAGING DOCUMENTS ONTO A PHOTOSENSOR ARRAY

Proposed Classification
U.S. C1. 355/8 Int. CI. G03g 15/28

Ned J. Seachman

I

F/G. /

t~- TOTAL LINE SCAN TIME PER ARRAY tR - ARRAY READOUT TIME

t~- PARALLEL TRANSFER AN@ RESET TIME

to- OVERLAP TIME t~- DELAY TIME
t x- TOTAL LINE REACOUT TIME t L= tR + t T- - t D+~o+~T

Volume 5 Number 4 July/August 1980

A.B,C.D -

F/G. 2

ARRAY

No.

LABELS OF CONTIGUOUS LINES ON DOCUMENT LINES ARE EEAD IN SEQUENCE A,B.C,D.A,B.C.D.A.B.C.D.A.B,

43 1

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OPTICAL SYSTEM FOR IMAGING DOCUMENTS ONTO A PHOTOSENSOR ARRAY {Con t'd)

Array 12 begins reading out its portion of line 1 (first line A) after a time delay, which provides a time overlap, t , such that the last elements from array 10 &e A) output simultaneously with 8e corresponding first elements of array 12 (line A); i.e., the element in the overlap region of array 10 which contains the signal from a specific pixel on document scan line A and the element of array 12 containing the signal from the document pixel are outputted simultaneously, so they may be added in real time. Array 12 then continues to read out its portion of successive document lines in the same manner as array 10, except for the initial delay.

Arrays 14 and 16 are each delayed from the previous array by the same tD and then read in a similar sequence.

In this manner the line scan time, t is the sum of tR and tT, which also equals the sum tD + to + tT'

Since photosensor arrays generally integrate light from one document line while they read out the signal from the previous line, array 10, for example, will integrate light from line B while reading out the line A signal. Since the readout of a specific line from one array is delayed t from the readout of the same line by the previous array, the start of signap integration of an array must be correspondingly delayed from that of the previous array. To accomplish this, the arrays must be staggered in space as shown in Figure 3. The line sensed by array 10 must arrive at array 12 a time t later. The staggering of successive arrays (referred to object space) is thus, = v t , where vD is the effective document tra...