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Browse Prior Art Database

Simultaneous Dual Scanner

IP.com Disclosure Number: IPCOM000074319D
Original Publication Date: 1971-Apr-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Bartz, MR: AUTHOR [+2]

Abstract

It is frequently advantageous to provide two simultaneously swept beams in an optical scanner. In character-recognition applications, for instance, one of the scans may be employed as a prescan to obtain contrast, registration, size or other useful information to allow increased accuracy and recognition by the second scan. Alternatively, both scans may be used for recognition-data collection, the results being compared to produce more accurate identification.

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Simultaneous Dual Scanner

It is frequently advantageous to provide two simultaneously swept beams in an optical scanner. In character-recognition applications, for instance, one of the scans may be employed as a prescan to obtain contrast, registration, size or other useful information to allow increased accuracy and recognition by the second scan. Alternatively, both scans may be used for recognition-data collection, the results being compared to produce more accurate identification.

Laser 10 and beam deflector 11 provide collimated light beam 12 which is deflected in a plane perpendicular to the page. Beam 12 is divided into two beams 13 and 14 by a conventional optical wedge 15 mounted in the wall of scanner head 16. Lens 17 focuses beams 13 and 14 onto spots 18 and 19 on a document plane. Diffused rays 20 reflected from point 18 are focused by lens 21 onto the surface of photodetector 22. Lens 21 also focuses rays 23 from point 19 onto the surface of a second photodetector 24.

As beam 12 is scanned by deflector 11, two simultaneous parallel scans are produced at points 18 and 19. Since the light reflected from these two points is collected separately by detectors 22 and 24, the data collected from each scan may be processed independently.

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