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    Method of and system for detecting and correcting mode switching in diffractive-based laser scanning systems
    23.
    发明申请
    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：US20050018722A1

    公开(公告)日：2005-01-27

    申请号：US10730874

    申请日：2003-12-09

    Applicant: Frank Check

    Inventor： Frank Check

    IPC: G02B26/10 ,  H01S3/13 ,  H01S3/10

    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。

    Bioptical holographic laser scanning system
    24.
    发明授权
    Bioptical holographic laser scanning system 失效
    生物全息激光扫描系统

    公开(公告)号：US06758402B1

    公开(公告)日：2004-07-06

    申请号：US09551887

    申请日：2000-04-18

    Applicant: Frank Check ,  LeRoy Dickson ,  John Groot ,  Timothy Good

    Inventor： Frank Check ,  LeRoy Dickson ,  John Groot ,  Timothy Good

    IPC: G06B710

    CPC classification number: G06K7/10871 ,  G02B26/10 ,  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 ,  G06K7/10881 ,  G06K7/10891 ,  G06K7/109 ,  G06K7/14 ,  G06K17/0022 ,  G06K2207/1012 ,  G06K2207/1013 ,  G06K2207/1016 ,  G06K2207/1017 ,  G06K2207/1018 ,  G07F11/002 ,  G07G1/0045 ,  G07G1/0054

    Abstract: A bioptical holographic laser scanning system employing a plurality of laser scanning stations about a holographic scanning disc having scanning facets with high and low elevation angle characteristics, as well as positive, negative and zero skew angle characteristics which strategically cooperate with groups of beam folding mirrors having optimized surface geometry characteristics. The system has an ultra-compact construction, ideally suited for space-constrained retail scanning environments, and, generate a 3-D omnidirectional laser scanning pattern between the bottom and side scanning windows during system operation. The laser scanning pattern of the present invention comprises a complex of pairs of quasi-orthogonal laser scanning planes, each composed by a plurality of substantially-vertical laser scanning planes for reading bar code symbols having bar code elements (i.e. ladder-type bar code symbols) that are oriented substantially horizontal with respect to the bottom scanning window, and a plurality of substantially-horizontal laser scanning planes for reading bar code symbols having bar code elements (i.e. picket-fence type bar code symbols) that are oriented substantially vertical with respect to the bottom scanning window.

    Abstract translation: 一种生物光学全息激光扫描系统，其采用围绕具有高和低仰角特征的扫描面的全息扫描盘的多个激光扫描站，以及正，负和零偏斜角特性，其与具有 优化的表面几何特征。 该系统具有超紧凑的结构，非常适合空间受限的零售扫描环境，并且在系统操作期间在底部和侧面扫描窗口之间生成3-D全向激光扫描图案。 本发明的激光扫描图案包括准正交激光扫描平面对，它们由多个基本垂直的激光扫描平面组成，用于读取具有条形码元素的条形码符号（即梯形条形码符号 ），以及多个基本上水平的激光扫描平面，用于读取条形码符号，所述条形码符号具有相对于基本垂直方向取向的条形码元素（即，栅栏栅栏型条形码符号） 到底部扫描窗口。

    Diffractive-based laser scanning system employing microcontroller programmed for mode-switching correction in response to binary mode switching signal generation
    25.
    发明授权
    Diffractive-based laser scanning system employing microcontroller programmed for mode-switching correction in response to binary mode switching signal generation 有权
    基于衍射的激光扫描系统，采用微控制器编程为响应于二进制模式切换信号产生的模式切换校正

    公开(公告)号：US06686586B2

    公开(公告)日：2004-02-03

    申请号：US09816642

    申请日：2001-03-23

    Applicant: Frank Check

    Inventor： Frank Check

    IPC: H01J314

    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。

    Reading system a variable pass-band
    27.
    发明授权
    Reading system a variable pass-band 有权

    公开(公告)号：US06422467B1

    公开(公告)日：2002-07-23

    申请号：US09241930

    申请日：1999-02-02

    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

    Abstract: The effects of papers/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 focussed 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 focal distance of the laser scanning beam producing the 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.

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