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Code symbol scanner using a double X bar pattern

  • US 4,093,865 A
  • Filed: 04/29/1977
  • Issued: 06/06/1978
  • Est. Priority Date: 04/29/1977
  • Status: Expired due to Term
First Claim
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1. A system for scanning a code symbol consisting of a combination of spaced parallel bars affixed to an object for providing coded information related to said object, and for providing an electrical signal indicative of said coded information in response to scanning said code symbol, comprisinga housing for defining a scanning region adjacent the housing for receiving objects having said code symbol;

  • means for providing a light beam;

    means for scanning said light beam in a predetermined scanning pattern within said defined scanning region;

    means for detecting light having at least a predetermined intensity and for providing an electrical signal in response to detection of said light; and

    means for directing light from said scanned light beam that is reflected from a said code symbol on a said received object to the detecting means;

    characterized bythe scanning means including an optical system for scanning said light beam at an acute angle to a reference plane defining a boundary of said defined scanning region and in a predetermined scanning pattern that includesa first bar in said reference plane extending normal to a first direction;

    second and third bars in said reference plane disposed along lines that intersect with each other and disposed symmetrically in relation to the first bar; and

    fourth and fifth bars in said reference plane disposed along lines that intersect with each other and disposed symmetrically in relation to the first bar;

    wherein the second and third bars intersect with each other and/or the fourth and fifth bars intersect with each other; and

    wherein the second bar intersects with the fifth bar and the third bar intersects with the fourth bar; and

    said pattern further includesa first plane extending through the first bar into said defined scanning region at an acute angle to said reference plane in said first direction, a second plane extending through the second bar into said defined scanning region at an acute angle to the reference plane at an acute angle to said first direction, a third plane extending through the third bar into said defined scanning region at an acute angle to said reference plane and at an acute angle to said first direction, a fourth plane extending through the fourth bar into said defined scanning region normal to said reference plane and at an acute angle to said first direction, and a fifth plane extending through the fifth bar into said defined scanning region normal to said reference plane and at an acute angle to said first direction,whereby when a said received object containing a said code symbol is moved within said defined scanning region from said first direction with said code symbol facing said reference plane or facing opposite said first direction, light scanned into said defined scanning region by the scanning means is reflected by said code symbol to the detecting means, and the detecting means provides an electrical signal indicative of said coded information.

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