System for reading two-dimensional images using ambient and/or projected light
First Claim
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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Accused Products
Abstract
A system for reading a two-dimensional image, and for comparing the two-dimensional image to stored data representative of a known image. The optical scanning device comprises a sensor for capturing the two-dimensional image, which sensor includes a light source for projecting an emitted light towards the two-dimensional image and an optical assembly for focussing light, which may be ambient and or emitted light from the light source, reflected from the framed two-dimensional image onto a CMOS or CCD detector for detecting the focussed light, the detector including a photodiode array for sensing the focussed light and generating a signal therefrom. Aiming of the sensor to read the two-dimensional image is facilitated by a frame locator consisting of a laser diode which emits a beam that is modified by optics, including diffractive optics, to divide the beam into beamlets which having a spacing therebetween that expands to match the dimensions of the field of view of the sensor, forming points of light at the target to define the edges of the field of view.
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Citations
20 Claims
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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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A frame locator for an optical scanner having a light source and a detector with a field of view for locating a target image within the field of view of the optical scanner, said detector for detecting an ambient light and an illuminating light from said light source, the frame locator comprising:
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at least one laser diode disposed within the optical scanner for emitting a laser beam; and
a diffractive optic for transforming said laser beam into a plurality of diverging beamlet, said diverging beamlets defining a beam edge and a beam width at said target image substantially equal to a width of the field of view. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. 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:
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a sensor for capturing said two-dimensional image, said sensor including;
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;
a compressor for compressing said electrical image signal, said compressor employing a compression algorithm to obtain a compressed image signal; and
a decoder for decoding said compressed image signal to obtain image data representative of said two-dimensional image. - View Dependent Claims (20)
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Specification