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System for reading two-dimensional images using ambient and/or projected light

  • US 20020075481A1
  • Filed: 01/02/2002
  • Published: 06/20/2002
  • Est. Priority Date: 10/26/1994
  • Status: Active Grant
First Claim
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1. An optical scanning device for reading a two-dimensional image having a first width wherein an ambient light impinges upon said two-dimensional image, said optical scanning device comprising:

  • a printed circuit board having a front edge with a second width;

    a light source mounted on said printed circuit board, said light source for projecting an emitted beam of light onto said two-dimensional image, said emitted beam of light having substantially said second width at said front edge of said printed circuit board and a first height and a third width at said two-dimensional image, said third width being greater than said second width and at least as large as said first width;

    a framing means disposed on said printed circuit board for framing said two-dimensional image to identify an area to be scanned by said sensor, wherein said framing means comprises at least one laser diode for emitting a laser beam and at least one diffractive optic for transforming said laser beam into a plurality of diverging beamlets, said diverging beamlets having a beam edge and a beamlet spacing at said two-dimensional image at least as large as said first width;

    an optical assembly disposed on said printed circuit board along an optical path for focussing light reflected from said framed two-dimensional image to obtain a focussed light, said reflected light comprising at least one of said ambient light and said emitted beam of light;

    a detector disposed on said printed circuit board along said optical path behind said optical assembly for detecting at least a portion of said focussed light within a field of view of said detector, said field of view having said first height and said third width, said detector for sensing said focussed light to obtain a sensed two-dimensional image;

    a controller for generating a plurality of control signals for controlling activation of said light source and said detector;

    a processor for processing said sensed two-dimensional image to obtain an electrical image signal; and

    an output means for converting said electrical image signal into image data.

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