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专利名称：Sensor array and illumination system for a
large depth-of-field bar code scanner
发明人：Mark M. Butterworth申请号：US07/296997申请日：190112公开号：US05010241A公开日：19910423
摘要：An improved sensor array and illumination scheme for a bar code scanner use amodified Scheimpflug arrangement optical system that simplifies signal processing. Thepreferred embodiment includes a detector array comprising a multi-element array ofphotosensors positioned in one Scheimpflug plane and an illumination beam in the formof a sheet of light along the other Scheimpflug plane. The detector array has a pluralityof elements having a long axis and a short axis, with the long axis of the elementsarranged substantially perpendicular to the image of the illuminated strip of the barcode tag. The projection of the long axis of the elements of the array onto the otherScheimpflug plane defines the working range of the optical system. So long as the barcode tag intersects the illumination beam within the working range, the image of theilluminated strip of the bar code tag will be substantially in focus across the elements ofthe detector array. Filtering allows substantially only the light from the illuminated stripto reach the detector array. Thus, substantially all of the light that reaches the detectorarray is useful signal, and all the output data from the array during a bar code scan isrelevant. The output signal from the array can be processed with conventional digitizingand decoding circuitry with audio signal processing techniques.
申请人：HEWLETT-PACKARD COMPANY
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