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Tripod Hand Scanner

IP.com Disclosure Number: IPCOM000073603D
Original Publication Date: 1971-Jan-01
Included in the Prior Art Database: 2005-Feb-22
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Jones, JE: AUTHOR

Abstract

This description is directed to a simple hand held wand or pencil used for reading coded information on documents. The wand is hand held and swept across the document at a rate controlled by the operator, and timing is accomplished by information inherent in the code. The wand includes four photocells in the tip. Three photocells A, B and C are arranged in a triangle, and one cell M is located in the center of the triangle formed by cells A, B and C. By printing the document with the particular width strips illustrated, which bear a particular geometric relationship to the dimensions of the tip, distinctive outputs are produced by the photocells no matter what the orientation of the wand.

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Tripod Hand Scanner

This description is directed to a simple hand held wand or pencil used for reading coded information on documents. The wand is hand held and swept across the document at a rate controlled by the operator, and timing is accomplished by information inherent in the code. The wand includes four photocells in the tip. Three photocells A, B and C are arranged in a triangle, and one cell M is located in the center of the triangle formed by cells A, B and C. By printing the document with the particular width strips illustrated, which bear a particular geometric relationship to the dimensions of the tip, distinctive outputs are produced by the photocells no matter what the orientation of the wand. On the narrow white stripe, for example, it is impossible to turn on more than two of the triangular arranged photocells, when the center itself is turned on. On the other hand it is impossible to pass across the wide stripe without turning on all photocells. This geometric characteristic produces a one or zero as illustrated. The unique advantage of this scheme is that it does not depend on the speed with which the operator moves the wand, and does not require timing information. The black transition area width is not critical above a minimum limit, and uniform character spacing, regardless of code content, may be achieved at a slight sacrifice in density, if desired, by using two different size transition areas.

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