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BARCODE SCANNER/READER HAVING CONSTANTLY VARYING FOCAL DISTANCE

  • US 20080245872A1
  • Filed: 04/05/2007
  • Published: 10/09/2008
  • Est. Priority Date: 04/05/2007
  • Status: Abandoned Application
First Claim
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1. A laser scanner for scanning a target object comprising:

  • a housing;

    a laser source provided within the housing for generating a laser beam for scanning the target object;

    a variable focus liquid lens having a predefined focal range and a focal distance at a given moment in time provided within the housing and positioned such that the laser beam is transmitted through the liquid lens on its way to the target image, the focal distance of the liquid lens being adjustable by varying an input voltage to the liquid lens;

    a driver circuit for the liquid lens generating a lens driver signal that provides continuously varying voltage input to the liquid lens and thus varying the focal distance of the liquid lens constantly and cyclically through the predefined focal range, wherein when the target object is presented to the scanner at a distance that is within the predefined focal range, the target object is read when the liquid lens reaches an optimal focal distance for the target object.

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