System for reading two-dimensional images using ambient and/or projected light
First Claim
1. A frame locator for indicating a field of view of a two-dimensional image detector in an optical scanner, the frame locator comprising:
- a first light source disposed within the optical scanner and directed to illuminate at least the field of view;
a diffractive optical element; and
a second light source disposed within the optical scanner and directed to illuminate the diffraction element;
wherein the light illuminating the diffraction element is diffracted into a pattern that substantially identifies at least a width of the field of view.
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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.
339 Citations
20 Claims
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1. A frame locator for indicating a field of view of a two-dimensional image detector in an optical scanner, the frame locator comprising:
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a first light source disposed within the optical scanner and directed to illuminate at least the field of view;
a diffractive optical element; and
a second light source disposed within the optical scanner and directed to illuminate the diffraction element;
wherein the light illuminating the diffraction element is diffracted into a pattern that substantially identifies at least a width of the field of view. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An optical scanning device for reading indicia in a two-dimensional image comprising:
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a two dimensional image detector;
an optical assembly comprising at least one lens and positioned to focus light from a two dimensional field of view onto the image sensor;
a decoder receiving data from the image detector and providing as output a decode information of an imaged bar code symbol;
a first light source disposed within the optical scanner and directed to illuminate at least the field of view;
a diffractive optical element; and
a second light source disposed within the optical scanner and directed to illuminate the diffraction element;
wherein the light illuminating the diffraction element is diffracted into a pattern that substantially identifies at least a width of the field of view. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification