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    Method of and system for detecting and correcting mode switching in diffractive-based laser scanning systems
    1.
    发明申请
    Method of and system for detecting and correcting mode switching in diffractive-based laser scanning systems 失效
    用于在基于衍射的激光扫描系统中检测和校正模式切换的方法和系统

    公开(公告)号：US20070295921A1

    公开(公告)日：2007-12-27

    申请号：US11810054

    申请日：2007-06-04

    Applicant: Frank Check

    Inventor： Frank Check

    IPC: G01J1/32

    CPC classification number: G01J1/32 ,  G02B26/106 ,  H01S5/0612 ,  H01S5/0687

    Abstract: The improved diffractive-based laser scanning system of the present invention monitors portions of the laser light beams generated by a laser light source (e.g., VLD) employed therein to generate a mode switching signal indicative of a shift in the characteristic wavelength of the laser light beams emitted from the laser light source. In response thereto, a temperature controller selectively heats (or cool) the laser light source to minimize and avoid such wavelength changes, thereby mitigating any potential problems caused by such wavelength changes (for example, unwanted beam distortion and signal processing errors as described above). Preferably, mode switching (e.g., change in characteristic wavelength of light emitted from the laser light source) is detected by monitoring a zeroth diffractive order beam produced by a diffractive element of the system. Moreover, temperature control of the laser light source is preferably accomplished using active heating elements (e.g., a heating resistor) and passive cooling elements (e.g., a heat sink) in thermal contact with the laser light source. In addition, temperature control of the laser light source is preferably accomplished over a heating range (between a minimum heat and maximum heat applied to the laser light source), whereby temperature within this range is approximated by a look-up table. Such a scheme may be implemented by an inexpensive microcontroller, which eliminates the costs for directly measuring the temperature of the laser light source thereby contributing further to a simple and cost-effective design.

    Abstract translation: 本发明的改进的基于衍射的激光扫描系统监测由其中使用的激光源（例如，VLD）产生的激光束的部分，以产生表示激光的特征波长偏移的模式切换信号 从激光光源射出的光束。 响应于此，温度控制器选择性地加热（或冷却）激光光源以最小化并避免这种波长变化，从而减轻由这种波长变化（例如，如上所述的不期望的波束失真和信号处理错误）引起的任何潜在问题， 。 优选地，通过监视由系统的衍射元件产生的零级衍射光束来检测模式切换（例如，从激光光源发射的光的特征波长的变化）。 此外，激光光源的温度控制优选使用与激光光源热接触的主动加热元件（例如，加热电阻器）和被动冷却元件（例如，散热器）来实现。 此外，激光光源的温度控制优选在加热范围（施加到激光光源的最小热和最大热之间）之间实现，由此在该范围内的温度由查找表近似。 这种方案可以由廉价的微控制器实现，其消除了直接测量激光光源的温度的成本，从而进一步促成简单和成本有效的设计。

    Method of and system for detecting and correcting mode switching in diffractive-based laser scanning systems
    2.
    发明授权
    Method of and system for detecting and correcting mode switching in diffractive-based laser scanning systems 有权
    用于在基于衍射的激光扫描系统中检测和校正模式切换的方法和系统

    公开(公告)号：US07227115B2

    公开(公告)日：2007-06-05

    申请号：US10730874

    申请日：2003-12-09

    Applicant: Frank Check

    Inventor： Frank Check

    IPC: G01J1/32

    CPC classification number: G01J1/32 ,  G02B26/106 ,  H01S5/0612 ,  H01S5/0687

    Abstract: A diffractive-based laser scanning system of the present invention monitors portions of the laser light beams generated by a laser light source (e.g., VLD) employed therein to generate a mode switching signal indicative of a shift in the characteristic wavelength of the laser light beams emitted from the laser light source. In response thereto, a temperature controller selectively heats (or cool) the laser light source to minimize and avoid such wavelength changes, thereby mitigating any potential problems caused by such wavelength changes. Preferably, mode switching (e.g., change in characteristic wavelength of light emitted from the laser light source) is detected by monitoring a zeroth diffractive order beam produced by a diffractive element of the system. Moreover, temperature control of the laser light source is preferably accomplished using active heating elements (e.g., a heating resistor) and passive cooling elements (e.g., a heat sink) in thermal contact with the laser light source.

    Abstract translation: 本发明的基于衍射的激光扫描系统监视由其中使用的激光源（例如，VLD）产生的激光束的部分，以产生表示激光束的特征波长偏移的模式切换信号 从激光光源发出。 响应于此，温度控制器选择性地加热（或冷却）激光光源以最小化并避免这种波长变化，从而减轻由这种波长变化引起的任何潜在问题。 优选地，通过监视由系统的衍射元件产生的零级衍射光束来检测模式切换（例如，从激光光源发射的光的特征波长的变化）。 此外，激光光源的温度控制优选使用与激光光源热接触的主动加热元件（例如，加热电阻器）和被动冷却元件（例如，散热器）来实现。

    Laser scanning bar code symbol reader employing variable passband filter structures having frequency response characteristics controlled by time-measurement of laser-scanned bar code symbol elements
    3.
    发明授权
    Laser scanning bar code symbol reader employing variable passband filter structures having frequency response characteristics controlled by time-measurement of laser-scanned bar code symbol elements 失效
    激光扫描条码符号读取器采用可变带通滤波器结构，具有由激光扫描的条形码元件的时间测量值控制的频率响应特性

    公开(公告)号：US07207492B2

    公开(公告)日：2007-04-24

    申请号：US10435606

    申请日：2003-05-09

    Applicant: Mark Lucera ,  Frank Check ,  C. Harry Knowles ,  Xiaoxun Zhu ,  LeRoy Dickson

    Inventor： Mark Lucera ,  Frank Check ,  C. Harry Knowles ,  Xiaoxun Zhu ,  LeRoy Dickson

    IPC: G06K7/10

    CPC classification number: G02B26/106 ,  G06K7/10 ,  G06K7/10564 ,  G06K7/10584 ,  G06K7/10594 ,  G06K7/10603 ,  G06K7/10663 ,  G06K7/10673 ,  G06K7/10693 ,  G06K7/10702 ,  G06K7/10792 ,  G06K7/10801 ,  G06K7/10811 ,  G06K7/10851 ,  G06K7/10861 ,  G06K7/10871 ,  G06K7/10881 ,  G06K7/10891 ,  G06K7/109 ,  G06K7/14 ,  G06K17/0022 ,  G06K2207/1013 ,  G07F11/002 ,  G07G1/0054

    Abstract: The effects of paper/substrate noise are significantly reduced in multi-focal zone laser scanning systems by processing analog scan data signals with a scan data signal processor having a plurality of pass-band filters and amplifiers that are automatically selected for passing only the spectral components of an analog scan data signal produced when a bar code symbol is scanned at a particular focal zone in the laser scanning system. Two or more different pass-band filter structures can be provided for use in the scan data signal processor, wherein each pass-band filter structure is tuned to the spectral band associated with a particular focal zone in the laser scanning system. When a bar code symbol is scanned by a laser beam focused within the first focal zone or scanning range of the system, the pass-band filter structure associated with this focal zone or scanning range is automatically switched into operation. Only spectral components associated with the produced analog scan data signal and noise existing over this pass-band are allowed within the analog signal processor. By virtue of the present invention, first and second derivative signals can be generated and processed to produce a corresponding digital scan data signal for use in subsequent digitizing and decoe processing operations, without compromising system performance due to the destructive effects of thermal and substrate noise outside the spectral pass-band of interest for the bar code symbol being scanned.

    Abstract translation: 通过用具有多个通带滤波器和放大器的扫描数据信号处理器处理模拟扫描数据信号，在多焦点区域激光扫描系统中，纸/衬底噪声的影响显着降低，这些扫描数据信号处理器被自动选择以仅通过光谱分量 当在激光扫描系统中的特定焦点区域扫描条形码符号时产生的模拟扫描数据信号。 可以提供两个或更多个不同的通带滤波器结构用于扫描数据信号处理器，其中每个通带滤波器结构被调谐到与激光扫描系统中的特定焦点区域相关联的光谱带。 当通过聚焦在系统的第一焦点区域或扫描范围内的激光束扫描条形码符号时，与该焦点区域或扫描范围相关联的通带滤波器结构被自动切换到操作中。 在模拟信号处理器内只允许与产生的模拟扫描数据信号相关联的频谱分量和存在于该通带上的噪声。 凭借本发明，可以产生和处理第一和第二导数信号以产生相应的数字扫描数据信号，以用于随后的数字化和解码处理操作，而不会由于外部的热和衬底噪声的破坏性影响而不损害系统性能 正在扫描的条形码符号感兴趣的光谱通带。

    MULTI-FOCAL LASER SCANNING BAR CODE SYMBOL READING SYSTEM EMPLOYING A SCAN DATA SIGNAL PROCESSOR HAVING A VARIABLE PASS-BAND FILTER STRUCTURE WITH FREQUENCY CHARACTERISTICS CONTROLLED BY DETECTING THE FOCAL DISTANCE OF THE LASER SCANNING BEAM PRODUCING THE ANALOG SCAN DATA SIGNAL BEING PROCESSED BY SAID DATA SIGNAL PROCESSOR
    4.
    发明授权
    MULTI-FOCAL LASER SCANNING BAR CODE SYMBOL READING SYSTEM EMPLOYING A SCAN DATA SIGNAL PROCESSOR HAVING A VARIABLE PASS-BAND FILTER STRUCTURE WITH FREQUENCY CHARACTERISTICS CONTROLLED BY DETECTING THE FOCAL DISTANCE OF THE LASER SCANNING BEAM PRODUCING THE ANALOG SCAN DATA SIGNAL BEING PROCESSED BY SAID DATA SIGNAL PROCESSOR 失效
    多功能激光扫描条代码符号读取系统采用具有频率特性的可变通道滤波器结构的扫描数据信号处理器，通过检测激光扫描光束的正交距离来控制，生成由数据信号处理的模拟扫描数据信号 处理器

    公开(公告)号：US06499661B1

    公开(公告)日：2002-12-31

    申请号：US09499529

    申请日：2000-02-10

    Applicant: Mark Lucera ,  Frank Check ,  C. Harry Knowles ,  Xiaoxun Zhu ,  LeRoy Dickson

    Inventor： Mark Lucera ,  Frank Check ,  C. Harry Knowles ,  Xiaoxun Zhu ,  LeRoy Dickson

    IPC: G06K710

    CPC classification number: G02B26/106 ,  G06K7/10 ,  G06K7/10564 ,  G06K7/10584 ,  G06K7/10594 ,  G06K7/10603 ,  G06K7/10663 ,  G06K7/10673 ,  G06K7/10693 ,  G06K7/10702 ,  G06K7/10792 ,  G06K7/10801 ,  G06K7/10811 ,  G06K7/10851 ,  G06K7/10861 ,  G06K7/10871 ,  G06K7/10881 ,  G06K7/10891 ,  G06K7/109 ,  G06K7/14 ,  G06K17/0022 ,  G06K2207/1013 ,  G07F11/002 ,  G07G1/0054

    Abstract: The effects of paper/substrate noise are significantly reduced in multi-focal zone laser scanning systems by processing analog scan data signals with a scan data signal processor having a plurality of pass-band filters and amplifiers that are automatically selected for passing only the spectral components of an analog scan data signal produced when a bar code symbol is scanned at a particular focal zone in the laser scanning system. Two or more different pass-band filter structures can be provided for use in the scan data signal processor, wherein each pass-band filter structure is tuned to the spectral band associated with a particular focal zone in the laser scanning system. When a bar code symbol is scanned by a laser beam focused within the first focal zone or scanning range of the system, the pass-band filter structure associated with this focal zone or scanning range is automatically switched into operation. Only spectral components associated with the produced analog scan data signal and noise existing over this pass-band are allowed within the analog signal processor. By virtue of the present invention, first and second derivative signals can be generated and processed to produce a corresponding digital scan data signal for use in subsequent digitizing and decode processing operations, without compromising system performance due to the destructive effects of thermal and substrate noise outside the spectral pass-band of interest for the bar code symbol being scanned.

    Abstract translation: 通过用具有多个通带滤波器和放大器的扫描数据信号处理器处理模拟扫描数据信号，在多焦点区域激光扫描系统中，纸/衬底噪声的影响显着降低，这些扫描数据信号处理器被自动选择以仅通过光谱分量 当在激光扫描系统中的特定焦点区域扫描条形码符号时产生的模拟扫描数据信号。 可以提供两个或更多个不同的通带滤波器结构用于扫描数据信号处理器，其中每个通带滤波器结构被调谐到与激光扫描系统中的特定焦点区域相关联的光谱带。 当通过聚焦在系统的第一焦点区域或扫描范围内的激光束扫描条形码符号时，与该焦点区域或扫描范围相关联的通带滤波器结构被自动切换到操作中。 在模拟信号处理器内只允许与产生的模拟扫描数据信号相关联的频谱分量和存在于该通带上的噪声。 凭借本发明，可以生成和处理第一和第二导数信号以产生相应的数字扫描数据信号，以用于随后的数字化和解码处理操作，而不会由于外部的热和衬底噪声的破坏性影响而不影响系统性能 正在扫描的条形码符号感兴趣的光谱通带。

    MULTI-FOCAL LASER SCANNING BAR CODE SYMBOL READING SYSTEM EMPLOYING A SCAN DATA SIGNAL PROCESSOR HAVING A VARIABLE PASS-BAND FILTER STRUCTURE WITH FREQUENCY CHARACTERISTICS CONTROLLED BY MEASURING THE BEAM SPOT SPEED OF THE LASER SCANNING BEAM PRODUCING THE ANALOG SCAN DATA SIGNAL BEING PROCESSED BY SAID SCAN DATA SIGNAL PROCESSOR
    9.
    发明授权
    MULTI-FOCAL LASER SCANNING BAR CODE SYMBOL READING SYSTEM EMPLOYING A SCAN DATA SIGNAL PROCESSOR HAVING A VARIABLE PASS-BAND FILTER STRUCTURE WITH FREQUENCY CHARACTERISTICS CONTROLLED BY MEASURING THE BEAM SPOT SPEED OF THE LASER SCANNING BEAM PRODUCING THE ANALOG SCAN DATA SIGNAL BEING PROCESSED BY SAID SCAN DATA SIGNAL PROCESSOR 失效
    多功能激光扫描条代码符号读取系统采用具有频率特性的可变通道滤波器结构的扫描数据信号处理器，通过测量激光扫描光束的光束速度控制，生成由模拟扫描进行的模拟扫描数据信号 数据信号处理器

    公开(公告)号：US06588663B1

    公开(公告)日：2003-07-08

    申请号：US09501903

    申请日：2000-02-10

    Applicant: Mark Lucera ,  Frank Check ,  C. Harry Knowles ,  Xiaoxun Zhu ,  LeRoy Dickson

    Inventor： Mark Lucera ,  Frank Check ,  C. Harry Knowles ,  Xiaoxun Zhu ,  LeRoy Dickson

    IPC: G06K710

    CPC classification number: G02B26/106 ,  G06K7/10 ,  G06K7/10564 ,  G06K7/10584 ,  G06K7/10594 ,  G06K7/10603 ,  G06K7/10663 ,  G06K7/10673 ,  G06K7/10693 ,  G06K7/10702 ,  G06K7/10792 ,  G06K7/10801 ,  G06K7/10811 ,  G06K7/10851 ,  G06K7/10861 ,  G06K7/10871 ,  G06K7/10881 ,  G06K7/10891 ,  G06K7/109 ,  G06K7/14 ,  G06K17/0022 ,  G06K2207/1013 ,  G07F11/002 ,  G07G1/0054

    Abstract: The zone laser scanning systems by processing analog scan data signals with a scan data signal processor having a plurality of pass-band filters and amplifiers that are automatically selected for passing only the spectral components of an analog scan data signal produced when a bar code symbol is scanned at a particular focal zone in the laser scanning system. Two or more different pass band filter structures can be provided for use in the scan data signal processor, wherein each pass-band filter structure is: tuned to the spectral band associated with a particular focal zone in the laser scanning system. When a bar code, symbol is scanned by a laser beam focused within the first focal zone or scanning range of the system, the pass-band filter structure associated with this focal zone or scanning range is automatically switched into operation using a control signal produced by determining the spot speed of the laser scanning beam producing the analog scan data signal being processed. Only spectral components associated with the produced analog scan data signal and noise existing over this pass-band are allowed within the analog signal processor. By virtue of the present invention, first and second derivative signals can be generated and processed to produce a corresponding digital scan data signal for use in subsequent digitizing and decode processing operations, without compromising system performance due to the destructive effects of thermal and substrate noise outside the spectral pass-band of interest for the bar code symbol being scanned.

    Abstract translation: 区域激光扫描系统通过用具有多个通带滤波器和放大器的扫描数据信号处理器来处理模拟扫描数据信号，该多个通带滤波器和放大器被自动选择，以便仅当通过条形码符号为...时产生的模拟扫描数据信号的频谱分量 在激光扫描系统的特定焦点区域扫描。 可以提供两个或更多个不同的通带滤波器结构用于扫描数据信号处理器，其中每个通带滤波器结构被调谐到与激光扫描系统中的特定聚焦区域相关联的光谱带。 当条形码，符号被聚焦在系统的第一焦点区域或扫描范围内的激光束扫描时，与该聚焦区域或扫描范围相关联的通带滤波器结构自动切换到使用由 确定激光扫描光束的光点速度，产生正在处理的模拟扫描数据信号。 在模拟信号处理器内只允许与产生的模拟扫描数据信号相关联的频谱分量和存在于该通带上的噪声。 凭借本发明，可以生成和处理第一和第二导数信号以产生相应的数字扫描数据信号，以用于随后的数字化和解码处理操作，而不会由于外部的热和衬底噪声的破坏性影响而不影响系统性能 正在扫描的条形码符号感兴趣的光谱通带。

    Laser scanning bar code symbol reader employing variable pass-band filter structures having frequency response characteristics controlled by time-measurement of laser-scanned bar code symbol
    10.
    发明授权
    Laser scanning bar code symbol reader employing variable pass-band filter structures having frequency response characteristics controlled by time-measurement of laser-scanned bar code symbol 失效
    激光扫描条形码符号读取器采用具有由激光扫描条形码符号的时间测量控制的频率响应特性的可变带通滤波器结构

    公开(公告)号：US06481625B2

    公开(公告)日：2002-11-19

    申请号：US09442718

    申请日：1999-11-18

    Applicant: Mark Lucera ,  Frank Check ,  C. Harry Knowles ,  Xiaoxun Zhu ,  LeRoy Dickson

    Inventor： Mark Lucera ,  Frank Check ,  C. Harry Knowles ,  Xiaoxun Zhu ,  LeRoy Dickson

    IPC: G06K710

    CPC classification number: G02B26/106 ,  G06K7/10 ,  G06K7/10564 ,  G06K7/10584 ,  G06K7/10594 ,  G06K7/10603 ,  G06K7/10663 ,  G06K7/10673 ,  G06K7/10693 ,  G06K7/10702 ,  G06K7/10792 ,  G06K7/10801 ,  G06K7/10811 ,  G06K7/10851 ,  G06K7/10861 ,  G06K7/10871 ,  G06K7/10881 ,  G06K7/10891 ,  G06K7/109 ,  G06K7/14 ,  G06K17/0022 ,  G06K2207/1013 ,  G07F11/002 ,  G07G1/0054

    Abstract: The effects of paper/substrate noise are significantly reduced in multi-focal zone laser scanning systems by processing analog scan data signals with a scan data signal processor having a plurality of pass-band filters and amplifiers that are automatically selected for passing only the spectral components of an analog scan data signal produced when a bar code symbol is scanned at a particular focal zone in the laser scanning system. Two or more different pass-band filter structures can be provided for use in the scan data signal processor, wherein each pass-band filter structure is tuned to the spectral band associated with a particular focal zone in the laser scanning system. When a bar code symbol is scanned by a laser beam focused within the first focal zone or scanning range of the system, the pass-band filter structure associated with this focal zone or scanning range is automatically switched into operation. Only spectral components associated with the produced analog scan data signal and noise existing over this pass-band are allowed within the analog signal processor. By virtue of the present invention, first and second derivative signals can be generated and processed to produce a corresponding digital scan data signal for use in subsequent digitizing and decode processing operations, without compromising system performance due to the destructive effects of thermal and substrate noise outside: the spectral pass-band of interest for the bar code symbol being scanned.

    Abstract translation: 通过用具有多个通带滤波器和放大器的扫描数据信号处理器处理模拟扫描数据信号，在多焦点区域激光扫描系统中，纸/衬底噪声的影响显着降低，这些扫描数据信号处理器被自动选择以仅通过光谱分量 当在激光扫描系统中的特定焦点区域扫描条形码符号时产生的模拟扫描数据信号。 可以提供两个或更多个不同的通带滤波器结构用于扫描数据信号处理器，其中每个通带滤波器结构被调谐到与激光扫描系统中的特定焦点区域相关联的光谱带。 当通过聚焦在系统的第一焦点区域或扫描范围内的激光束扫描条形码符号时，与该焦点区域或扫描范围相关联的通带滤波器结构被自动切换到操作中。 在模拟信号处理器内只允许与产生的模拟扫描数据信号相关联的频谱分量和存在于该通带上的噪声。 凭借本发明，可以生成和处理第一和第二导数信号以产生相应的数字扫描数据信号，以用于随后的数字化和解码处理操作，而不会由于外部的热和衬底噪声的破坏性影响而不影响系统性能 ：正在扫描的条形码符号感兴趣的光谱通带。

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