×

LASER SCANNING SYSTEM EMPLOYING AN OPTICS MODULE CAPABLE OF FORMING A LASER BEAM HAVING AN EXTENDED DEPTH OF FOCUS (DOF) OVER THE LASER SCANNING FIELD

  • US 20150048168A1
  • Filed: 09/29/2014
  • Published: 02/19/2015
  • Est. Priority Date: 09/15/2011
  • Status: Active Grant
First Claim
Patent Images

1. A system for reading symbols, comprising:

  • a scanning module for scanning a laser beam across a scanning field having a near-field portion and a far-field portion, the scanning module comprising;

    a far-field source;

    a far-field optics module having an optical axis;

    a drive module for driving the far-field source and the far-field optics module to produce a far-field laser beam; and

    a scanning mechanism for scanning the far-field laser beam across the scanning field;

    a photo-detector for detecting the intensity of light reflected from the scanning field and generating a signal corresponding to the detected light intensity;

    a processor for decoding the generated signal to generate data representative of a symbol in the scanning field;

    wherein the far-field optics module comprises;

    an aperture stop for shaping the far-field laser beam to a predetermined diameter;

    a collimating lens for collimating the far-field laser beam shaped by the aperture stop;

    an apodization element having a first optical surface and a second optical surface; and

    a negative bi-prism, after the apodization element along the optical axis, for transforming the energy distribution of the far-field laser beam to substantially a single beam spot in the far-field portion of the scanning field.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×