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    COMBINED RANGE LASER SCANNER
    3.
    发明专利
    COMBINED RANGE LASER SCANNER 未知

    公开(公告)号：CA2056272A1

    公开(公告)日：1992-12-15

    申请号：CA2056272

    申请日：1991-11-27

    Applicant: SYMBOL TECHNOLOGIES INC

    Inventor： SALATTO PATRICK JR ,  MAZZ THOMAS

    IPC: G02B26/10 ,  G06K7/10 ,  G11B7/00

    Abstract: A combined range laser scanner and method for electro-optically reading indicia such as bar codes having parts of different light reflectivity which utilizes two laser diode optical illumination systems optimally focused for different working ranges. A first laser illumination system is optimized for contact operation and has a range extending to approximately two feet. The second laser illumination system is optimized for longer range scanning from approximately two to seventeen feet, and the two laser scanning systems are integrated into one combined range laser scanner. The combined range laser scanner incorporates therein logic circuitry which enables either laser illumination system as required fro the particular scanning application. Depending upon which laser illumination system is selected, the laser spot speed (e.g. amplitude of the drive signal for the scanning motor) is controlled to limit the frequency of received light signals to that of standard signal processing and decoding circuits. Scanning is achieved with a common oscillating mirror element driven by a scanning motor, and the amplitude of the applied scanning motor driving signal is greater for the first laser illumination system optimized for contact or short range operation and less for the second laser illumination system for longer range scanning.

    6.
    发明专利
    未知

    公开(公告)号：DE69130949D1

    公开(公告)日：1999-04-08

    申请号：DE69130949

    申请日：1991-12-30

    Applicant: SYMBOL TECHNOLOGIES INC

    Inventor： BARKAN EDWARD ,  GOREN DAVID P ,  KATZ JOSEPH ,  LI YAJUN ,  SWARTZ JEROME ,  MAZZ THOMAS

    IPC: G06K7/015 ,  G06K7/10 ,  G06K7/14

    Abstract: The method and apparatus of this invention facilitate operation of a bar code reader over a wider range of working angle and for a wider range of bar code densities. The invention includes improved optics and sensing elements. The optics and sensing elements and/or the associated circuitry are arranged to provide two channels of data derived form the scanned bar code. The two channels have differing resolutions. Analysis of the data from the two channels provides a single decoded result. As the working angle and density vary at least one of the resolutions will be appropriate for sensing all or most of the bar coded data. The data from the channel producing a valid result can be used, or if neither channel produces a valid result by itself, data from each channel can be analyzed and valid portions of the data from both channels combined to produce the single decoded result.

    9.
    发明专利
    未知

    公开(公告)号：DE69130949T2

    公开(公告)日：1999-10-07

    申请号：DE69130949

    申请日：1991-12-30

    Applicant: SYMBOL TECHNOLOGIES INC

    Inventor： BARKAN EDWARD ,  GOREN DAVID P ,  KATZ JOSEPH ,  LI YAJUN ,  SWARTZ JEROME ,  MAZZ THOMAS

    IPC: G06K7/015 ,  G06K7/10 ,  G06K7/14

    Abstract: The method and apparatus of this invention facilitate operation of a bar code reader over a wider range of working angle and for a wider range of bar code densities. The invention includes improved optics and sensing elements. The optics and sensing elements and/or the associated circuitry are arranged to provide two channels of data derived form the scanned bar code. The two channels have differing resolutions. Analysis of the data from the two channels provides a single decoded result. As the working angle and density vary at least one of the resolutions will be appropriate for sensing all or most of the bar coded data. The data from the channel producing a valid result can be used, or if neither channel produces a valid result by itself, data from each channel can be analyzed and valid portions of the data from both channels combined to produce the single decoded result.

    10.
    发明专利
    未知

    公开(公告)号：AT177226T

    公开(公告)日：1999-03-15

    申请号：AT91122399

    申请日：1991-12-30

    Applicant: SYMBOL TECHNOLOGIES INC

    Inventor： BARKAN EDWARD ,  GOREN DAVID P ,  KATZ JOSEPH ,  LI YAJUN ,  SWARTZ JEROME ,  MAZZ THOMAS

    IPC: G06K7/015 ,  G06K7/10 ,  G06K7/14

    Abstract: The method and apparatus of this invention facilitate operation of a bar code reader over a wider range of working angle and for a wider range of bar code densities. The invention includes improved optics and sensing elements. The optics and sensing elements and/or the associated circuitry are arranged to provide two channels of data derived form the scanned bar code. The two channels have differing resolutions. Analysis of the data from the two channels provides a single decoded result. As the working angle and density vary at least one of the resolutions will be appropriate for sensing all or most of the bar coded data. The data from the channel producing a valid result can be used, or if neither channel produces a valid result by itself, data from each channel can be analyzed and valid portions of the data from both channels combined to produce the single decoded result.

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