Imaging Bar Code Reader with Illumination Control System
First Claim
1. A barcode reader for imaging a target comprising:
- an imaging system that includes a light monitoring pixel array for converting light reflected from a target into electrical signals;
an optical system having one or more focusing lenses positioned with respect to the pixel array to transmit an image of a target object toward said pixel array;
an illumination system comprising one or more light emitting diodes for illuminating a the target within a field of view defined by the optical system;
a drive circuit coupled to the one or more light emitting diodes of the illumination system including at least one energy storage capacitor for providing an electrical pulse to the one or more light emitting diodes for illuminating the target;
anda discharge control for selectively energizing the light emitting diodes by discharging the at least one capacitor of the drive circuit.
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Accused Products
Abstract
The disclosed bar code reader includes an auto-focusing component for rapidly producing in focus images. An imaging system makes use of an aiming pattern that impinges upon the coded indicia of a target. The imaging system includes a light monitoring pixel array and a focusing lens that is fixed with respect to the pixel array for transmitting an image of the target object onto the pixel array. The bar code reader also includes an illumination system comprising one or more light emitting diodes for illuminating a the target within a field of view defined by the optical system. A drive circuit coupled to the light emitting diodes of the illumination system including at least one energy storage capacitor for providing an electrical pulse that illuminates the target. A controller selectively energizes the light emitting diodes by discharging the at least one capacitor of the drive circuit.
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Citations
30 Claims
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1. A barcode reader for imaging a target comprising:
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an imaging system that includes a light monitoring pixel array for converting light reflected from a target into electrical signals; an optical system having one or more focusing lenses positioned with respect to the pixel array to transmit an image of a target object toward said pixel array; an illumination system comprising one or more light emitting diodes for illuminating a the target within a field of view defined by the optical system; a drive circuit coupled to the one or more light emitting diodes of the illumination system including at least one energy storage capacitor for providing an electrical pulse to the one or more light emitting diodes for illuminating the target; and a discharge control for selectively energizing the light emitting diodes by discharging the at least one capacitor of the drive circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A barcode reader for imaging a target comprising:
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an imaging system that includes a light monitoring pixel array for converting light reflected from a target into electrical signals; an optical system having one or more focusing lenses positioned with respect to the pixel array to transmit an image of a target object toward said pixel array; an illumination system comprising one or more light emitting diodes for illuminating a the target within a field of view defined by the optical system; a voltage boost circuit, coupled to the one or more light emitting diodes of the illumination system, providing energy to a storage element that supplies a current pulse to the one or more light emitting diodes for illuminating the target. - View Dependent Claims (10, 11)
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12. A method for imaging a target with an imaging based bar code reader comprising:
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positioning one or more focusing lenses with respect to a pixel array to transmit an image of a target object toward said pixel array; providing one or more light emitting diodes for illuminating the target within a field of view defined by the focusing lenses; storing energy in at least one energy storage capacitor for providing an electrical pulse that illuminates the target; selectively energizing the light emitting diodes by discharging the at least one capacitor through at least one of said one or more light emitting diodes; and converting light impinging on the pixel array reflected from a target into electrical signals for imaging. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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20. An imaging based barcode reader for imaging a target object comprising:
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imaging means for forming an image on a light monitoring pixel array, focusing means fixed with respect to the pixel array for focusing an image of a target object to the pixel array; illumination means for illuminating a target object comprising; charging means for storing a charge; discharge means for providing a discharge path from the charging means and light emitting means for responding to a discharge of the charging means by emitting a light pulse. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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Specification