Diffuse bright field illumination system for a barcode reader
First Claim
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1. A diffuse bright field illumination system for a barcode reader, comprising:
- an optic comprising light-diffusing characteristics; and
a plurality of illumination elements located on edges of the optic, wherein the plurality of illumination elements direct illumination into the optic, wherein the light-diffusing characteristics of the optic diffuse the illumination, and wherein a majority of the diffused illumination exits a front major surface of the optic.
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Abstract
One aspect of the present disclosure is related to a barcode reader that includes a bright field illumination system, a dark field illumination system, and an additional illumination system that is better able to illuminate an area of the reader'"'"'s field of view between the far zone (where bright field illumination is optimal) and the close zone (where dark field illumination is optimal). In this “center zone,” the dark field illumination may not be bright enough and the bright field illumination may not be diffuse enough for reading a barcode.
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20 Claims
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1. A diffuse bright field illumination system for a barcode reader, comprising:
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an optic comprising light-diffusing characteristics; and a plurality of illumination elements located on edges of the optic, wherein the plurality of illumination elements direct illumination into the optic, wherein the light-diffusing characteristics of the optic diffuse the illumination, and wherein a majority of the diffused illumination exits a front major surface of the optic. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An illumination system for a barcode reader, comprising:
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an optical substrate having a front major surface and a back major surface, the optical substrate comprising at least one extraction feature; and a plurality of light sources positioned between the front major surface and the back major surface, wherein the plurality of light sources direct illumination into the optical substrate, and wherein the at least one extraction feature extracts the illumination through the front major surface as diffuse illumination. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification