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CODE SYMBOL READING SYSTEM EMPLOYING DYNAMICALLY-ELONGATED LASER SCANNING BEAMS FOR IMPROVED LEVELS OF PERFORMANCE

  • US 20130043312A1
  • Filed: 08/15/2011
  • Published: 02/21/2013
  • Est. Priority Date: 08/15/2011
  • Status: Abandoned Application
First Claim
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1. A laser scanning bar code symbol reading system for scanning and reading poor quality or damaged bar code symbols, said laser scanning bar code symbol reading system having a working range and comprising:

  • a housing having a light transmission window;

    a dynamically-elongated laser beam production module for producing, in response to a triggering event, a dynamically-elongated laser beam having (i) a direction of propagation extending along a z reference direction, (ii) a height dimension being indicated by the y reference direction, and (iii) a width dimension being indicated by the x reference direction, where x, y and z directions are orthogonal to each other;

    wherein said dynamically-elongated laser beam is characterized by an elongation ratio (ER) that is defined as Y/X where, for any point within said working range of said laser scanning bar code symbol reading system, extending along said z direction,(i) Y indicates the beam height of said dynamically-elongated laser beam measured in said Y reference direction,(ii) X indicates the beam width of said dynamically-elongated laser beam measured in the X reference direction, and(iii) said beam height (Y) and said laser beam width (X) are measured at 1/e2 intensity clip level; and

    (iv) the elongation ratio of said dynamically-elongated laser beam changes among a set of discrete ER values during each laser scanning bar code symbol reading cycle initiated by said triggering event; and

    a laser scanning mechanism for scanning said dynamically-elongated laser beam out said light transmission window and across a scanning field defined external to said housing, in which a bar code symbol is present for scanning by said dynamically-elongated laser scanning beam.

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