Browse Prior Art Database

OPTICALLY COUPLED IMAGE SCANNER

IP.com Disclosure Number: IPCOM000026494D
Original Publication Date: 1992-Jun-30
Included in the Prior Art Database: 2004-Apr-06
Document File: 6 page(s) / 191K

Publishing Venue

Xerox Disclosure Journal

Abstract

This proposal describes a method to optically couple an image array electronics on a scanning element of a scanner with processing and storage electronics on a fired portion of the scanner mechanism thereby eliminating the multiple wire high speed data lines. Image or timing data is transmitted by LEDs (or laser diodes) mounted on the fixed portion of the scanning mechanism. These optical "beams" are parallel to the scanning axis and thus maintain optical alignment during scanning. A multitude of these transmitterkeceptor pairs can be mounted along the carriage provided that they are prevented from crosstalking by proper limitation of transmittance and acceptance angle and/or selective spectral filtration.

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Page 1 of 6

XEROX DISCLOSURE JOURNAL

OPTICALLY COUPLED IMAGE Proposed Classification SCANNER U.S. Cl. 3551235 Stephen C. Corona Int. C1. G03g 15/28

26

...............................................

----------________ ---------------________________

OPTICAL TRANSM l SSl ON ANGLE

--------_-______

--------_________

...............................................

.................................. --------_______

SCAN DIRECTION _____+

------______ .....................

16 - 10

12

FIG. I

XEROX DISCLOSURE JOURNAL - Vol. 17, No. 3 May/June 1992 141

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Page 2 of 6

OPTICALLY COUPLED IMAGE SCANNER(Cont'd)

I

14

N 3 2 1

IMAGE CORRECTION ANALOG TO DIGITAL CONVERSION, IMAGE PROCESSING

34

DATA FLOW PARALLEL TO

    SERIAL DATA CONVERSION 36 I

I

12

I

 POSSl B LE I NTEG RAT1 ON 38

ON IMAGE ARRAY

DIODE

40

142 XEROX DISCLOSURE JOURNAL - Vol. 17, No. 3 May/June 1992

I

PHOTO SIGNAL ----- +I

*

16 42 40 FiG. 2

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Page 3 of 6

OPTICALLY COUPLED IMAGE SCANNER(Cont'd)

FIG. 3

W3 IS THE MAXIMUM OPTICALTRANSMISSION ANGLE

FIG. 4

FIG. 5

XEROX DISCLOSURE JOURNAL - Vol. 17, No. 3 May/June 1992 143

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Page 4 of 6

OPTICALLY COUPLED IMAGE SCANNER(Cont'd)

This proposal describes a method to optically couple an image array electronics on a scanning element of a scanner with processing and storage electronics on a fired portion of the scanner mechanism thereby eliminating the multiple wire high speed data lines. Image or timing data is transmitted by LEDs (or laser diodes) mounted on the fixed portion of the scanning mechanism. These optical "beams" are parallel to the scanning axis and thus maintain optical alignment during scanning. A multitude of these transmitterkeceptor pairs can be mounted along the carriage provided that they are prevented from crosstalking by proper limitation of transmittance and acceptance angle and/or selective spectral filtration.

Referring to Figure 1 , shown is an overhead view of a typical "flatbed" scanner 10 wherein a scan carriage 12 is powered to move across an image plane illuminating and capturing an image of a document on the platen surface using full width image array 14. In this embodiment, four separate channels of image are shown although the actual number could be more or less depending on the speed or specific hardware requirements. The image data captured by image array 14 is transformed to a serial bit stream and subsequently transmitted by LEDs 18,20,22,24 to photosensors 26,28,30,32, respectively mounted on scanner frame 16, thereby eliminating the need for a hardwire data line connection.

Referring also to Figure 2 where like numerals designate like parts, shown is a block diagram of the scanning system showing one possible method of transmitting the image data to an Electronic Subsystem (ESS) or Image Output Terminal (IOT), Image da...