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Linear Detector Array Bar Code Reader

IP.com Disclosure Number: IPCOM000062797D
Original Publication Date: 1986-Dec-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Baer, J: AUTHOR [+4]

Abstract

This publication describes a system for reading coded indices on integrated circuit boards. Laser or etching marking of circuit boards is employed in order to track circuit boards through the manufacturing process. The marks can consist of various formats. One type is using bars of two widths, the wider bars having twice the width of the narrow ones, or finding the presence or absence of a single width mark sequence. There are a number of readers for such codes available on the market today, but these are designed to read ink marks on paper, and do not work well when reading bar code written directly on circuit boards. This publication describes a reader optimized for circuit boa (Image Omitted)

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Linear Detector Array Bar Code Reader

This publication describes a system for reading coded indices on integrated circuit boards. Laser or etching marking of circuit boards is employed in order to track circuit boards through the manufacturing process. The marks can consist of various formats. One type is using bars of two widths, the wider bars having twice the width of the narrow ones, or finding the presence or absence of a single width mark sequence. There are a number of readers for such codes available on the market today, but these are designed to read ink marks on paper, and do not work well when reading bar code written directly on circuit boards. This publication describes a reader optimized for circuit boa

(Image Omitted)

Bar codes on circuit panels may be read by the system shown in the drawing. The code 14 on board 16 is illuminated by source 18 and imaged by lens 12 onto a linear detector array 10. The array is read out very rapidly compared to the speed of the board. Thus, as the panel is moved beneath the reading head, parallel to the direction of the lines numerous signals are produced, only one of which must be good in order to identify the part. The marks are sometimes damaged by dirt or scratches, but a signal is obtained if they are good on only a single narrow line. This system has the advantage of being insensitive to the speed at which the boards are moving and to the uniformity of their motion. The board may also come to a complete stop b...