Hand held symbology reader illumination diffuser
First Claim
Patent Images
1. An apparatus for imaging a symbol on an object, the apparatus comprising:
- a hand held portable imaging system having an imager;
a lens disposed between the imager and a region of interest, the region of interest being the intended position of the symbol on the object, the lens and imager defining a field of view and an optical axis;
a diffuser concentrically aligned with the optical axis, having a first end surrounding the field of view proximate to the lens, and a second end surrounding the field of view proximate to the region of interest;
a dark field illuminating light pipe concentrically aligned with the optical axis and adjacent to the second end of diffuser; and
a dark field illuminator directing illumination into the dark field illuminating light pipe.
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Accused Products
Abstract
A hand held industrial identification symbol reader projects diffuse illumination onto a region of interest to produce high contrast images of symbols. The diffuse illumination is particularly well suited for producing images of symbols that are marked directly on objects. The diffuse illumination is created through the use of an optically translucent diffuser having a generally tapered shape that distributes diffuse illumination throughout the field of view of the reader. The diffuse illumination can be supplemented with dark field illumination using selectively actuated illumination sources.
258 Citations
15 Claims
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1. An apparatus for imaging a symbol on an object, the apparatus comprising:
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a hand held portable imaging system having an imager; a lens disposed between the imager and a region of interest, the region of interest being the intended position of the symbol on the object, the lens and imager defining a field of view and an optical axis; a diffuser concentrically aligned with the optical axis, having a first end surrounding the field of view proximate to the lens, and a second end surrounding the field of view proximate to the region of interest; a dark field illuminating light pipe concentrically aligned with the optical axis and adjacent to the second end of diffuser; and a dark field illuminator directing illumination into the dark field illuminating light pipe. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An apparatus for imaging a symbol on an object, the apparatus comprising:
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a hand held portable imaging system having an imager; a lens disposed between the imager and a region of interest, the region of interest being the intended position of the symbol on the object, the lens and imager defining a field of view and an optical axis; a dark field illuminating light pipe having a first end and a second end, the second end surrounding the field of view proximate to the region of interest and configured to emit a dark field illumination toward the object at a low angle; a diffuser aligned with the optical axis, the diffuser having a first end proximate to the lens, and a second end surrounding the field of view proximate to the object, the second end of the diffuser proximate to the dark field illuminating light pipe; and an illuminator to provide illumination to the diffuser. - View Dependent Claims (10, 11, 12, 13)
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14. An apparatus for imaging a symbol on an object, the apparatus comprising:
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a hand held portable imaging system having an imager; a lens disposed between the imager and a region of interest, the region of interest being the intended position of the symbol on the object, the lens and imager defining a field of view and an optical axis; a diffuser aligned with the optical axis, having a first distal end proximate to the lens, and a second distal end proximate to the region of interest; an illuminator for illuminating the diffuser comprises a plurality of illuminators; a dark field illuminating light pipe aligned with the optical axis wherein the diffuser directs light toward the region of interest, through an interior perimeter of the dark field illuminating light pipe; and a dark field illuminator directing illumination into the dark field illuminating light pipe. - View Dependent Claims (15)
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Specification