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1. 发明申请

US20070295921A1 Method of and system for detecting and correcting mode switching in diffractive-based laser scanning systems 失效
$Method of and system for detecting and correcting mode switching in diffractive-based laser scanning systems$
标题翻译：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
申请人： Frank Check
发明人： Frank Check
IPC分类号： G01J1/32
CPC分类号： G01J1/32 , G02B26/106 , H01S5/0612 , H01S5/0687
摘要： 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.
摘要翻译：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。

2. 发明授权

US07227115B2 Method of and system for detecting and correcting mode switching in diffractive-based laser scanning systems 有权
$Method of and system for detecting and correcting mode switching in diffractive-based laser scanning systems$
标题翻译：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
申请人： Frank Check
发明人： Frank Check
IPC分类号： G01J1/32
CPC分类号： G01J1/32 , G02B26/106 , H01S5/0612 , H01S5/0687
摘要： 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.
摘要翻译：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。

3. 发明授权

US07207492B2 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
标题翻译：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
申请人： Mark Lucera , Frank Check , C. Harry Knowles , Xiaoxun Zhu , LeRoy Dickson
发明人： Mark Lucera , Frank Check , C. Harry Knowles , Xiaoxun Zhu , LeRoy Dickson
IPC分类号： G06K7/10
CPC分类号： 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
摘要： 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.
摘要翻译：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。

4. 发明授权

US06499661B1 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
标题翻译：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
申请人： Mark Lucera , Frank Check , C. Harry Knowles , Xiaoxun Zhu , LeRoy Dickson
发明人： Mark Lucera , Frank Check , C. Harry Knowles , Xiaoxun Zhu , LeRoy Dickson
IPC分类号： G06K710
CPC分类号： 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
摘要： 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.
摘要翻译：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。

5. 发明授权

US07395968B2 Laser scanning based bar code symbol reading system for producing a 3-D scanning volume substantially free of spatially and temporally coincident laser scanning planes 失效
标题翻译：基于激光扫描的条形码符号读取系统，用于产生基本上无空间和时间一致的激光扫描平面的3-D扫描体积
公开(公告)号：US07395968B2
公开(公告)日：2008-07-08
申请号：US11640538
申请日：2006-12-15
申请人： LeRoy Dickson , Frank Check , John Groot , C. Harry Knowles
发明人： LeRoy Dickson , Frank Check , John Groot , C. Harry Knowles
IPC分类号： G06K7/10
CPC分类号： G06K7/10871 , G02B5/32 , 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 , G06K2207/1016 , G06K2207/1017 , G06K2207/1018 , G06Q10/087 , G07F11/002 , G07G1/0045 , G07G1/0054
摘要： A holographic laser scanner of ultra-compact design capable of reading bar and other types of graphical indicia within a large scanning volume using holographic optical elements and visible laser diodes. The holographic optical elements are arranged on the scanning disc in such a manner so that none of the laser scanning planes generated within the 3-D scanning volume of the system are spatially and temporally coincident with any other laser scanning plane within the 3-D scanning volume. This novel feature of the present invention ensures that there is substantially zero cross-talk at the plurality of photodetectors provided within the system, significantly improving the performance of the system.
摘要翻译：一种超紧凑设计的全息激光扫描仪，能够使用全息光学元件和可见激光二极管在大扫描体积内读取条和其他类型的图形标记。全息光学元件以这样的方式布置在扫描盘上，使得在系统的3-D扫描体积内产生的激光扫描平面在3D扫描内的空间和时间上与任何其它激光扫描平面不一致卷。本发明的这个新颖特征确保了在系统内提供的多个光电探测器上基本上没有串扰，从而显着提高了系统的性能。

6. 发明授权

US07051922B2 Compact bioptical laser scanning system 失效
公开(公告)号：US07051922B2
公开(公告)日：2006-05-30
申请号：US09837535
申请日：2001-04-18
申请人： Frank Check , LeRoy Dickson , John Groot , Timothy Good
发明人： Frank Check , LeRoy Dickson , John Groot , Timothy Good
IPC分类号： G06K7/10
CPC分类号： 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 , G06K7/10871 , 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
摘要： 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, which include 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.

7. 发明授权

US06991167B2 Bioptical laser scanning system providing 360° of omnidirectional bar code symbol scanning coverage at a point of sale (POS) station 失效
标题翻译：生物激光扫描系统在销售点（POS）站提供360°的全方位条码符号扫描覆盖
公开(公告)号：US06991167B2
公开(公告)日：2006-01-31
申请号：US10436893
申请日：2003-05-13
申请人： Frank Check , LeRoy Dickson , John Groot , Timothy Good
发明人： Frank Check , LeRoy Dickson , John Groot , Timothy Good
IPC分类号： G06K7/10
CPC分类号： 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
摘要： Disclosed is a bioptical laser scanning system that provides 360° of omnidirectional bar code symbol scanning coverage at a point of sale (POS) station. The system generates a 3-D omnidirectional laser scanning pattern between the horizontal and vertical 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 horizontal 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 horizontal scanning window.
摘要翻译：公开了一种生物激光扫描系统，其在销售点（POS）站处提供360°的全方位条形码符号扫描覆盖。系统运行期间，系统在水平和垂直扫描窗口之间生成三维全向激光扫描图案。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，该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）到水平扫描窗口。

8. 发明申请

US20050189417A1 Holographic laser scanning system having multiple laser scanning stations for producing a 3-D scanning volume substantially free of spatially and temporally coincident scanning planes 失效
标题翻译：全息激光扫描系统具有多个激光扫描站，用于产生基本上不存在空间和时间重合的扫描平面的3-D扫描体积
公开(公告)号：US20050189417A1
公开(公告)日：2005-09-01
申请号：US11032700
申请日：2005-01-10
申请人： LeRoy Dickson , Frank Check , John Groot , C. Knowles
发明人： LeRoy Dickson , Frank Check , John Groot , C. Knowles
IPC分类号： G02B26/10 , G06K7/10 , G06K7/14 , G06K17/00 , G06Q10/08 , G07G1/00
CPC分类号： G06K7/10871 , G02B5/32 , 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 , G06K2207/1016 , G06K2207/1017 , G06K2207/1018 , G06Q10/087 , G07F11/002 , G07G1/0045 , G07G1/0054
摘要： A holographic laser scanner of ultra-compact design capable of reading bar and other types of graphical indicia within a large scanning volume using holographic optical elements and visible laser diodes. The holographic optical elements are arranged on the scanning disc in such a manner so that none of the laser scanning planes generated within the 3-D scanning volume of the system are spatially and temporally coincident with any other laser scanning plane within the 3-D scanning volume. This novel feature of the present invention ensures that there is substantially zero cross-talk at the plurality of photodetectors provided within the system, significantly improving the performance of the system.
摘要翻译：一种超紧凑设计的全息激光扫描仪，能够使用全息光学元件和可见激光二极管在大扫描体积内读取条和其他类型的图形标记。全息光学元件以这样的方式布置在扫描盘上，使得在系统的3-D扫描体积内产生的激光扫描平面在3D扫描内的空间和时间上与任何其它激光扫描平面不一致卷。本发明的这个新颖特征确保了在系统内提供的多个光电探测器上基本上没有串扰，从而显着提高了系统的性能。

9. 发明授权

US06588663B1 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
标题翻译：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
申请人： Mark Lucera , Frank Check , C. Harry Knowles , Xiaoxun Zhu , LeRoy Dickson
发明人： Mark Lucera , Frank Check , C. Harry Knowles , Xiaoxun Zhu , LeRoy Dickson
IPC分类号： G06K710
CPC分类号： 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
摘要： 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.
摘要翻译：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。

10. 发明授权

US06481625B2 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
标题翻译：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
申请人： Mark Lucera , Frank Check , C. Harry Knowles , Xiaoxun Zhu , LeRoy Dickson
发明人： Mark Lucera , Frank Check , C. Harry Knowles , Xiaoxun Zhu , LeRoy Dickson
IPC分类号： G06K710
CPC分类号： 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
摘要： 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.
摘要翻译：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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