CN102982301B - 具有光学滤波器的可解码标记读取终端 - Google Patents

具有光学滤波器的可解码标记读取终端 Download PDF

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CN102982301B
CN102982301B CN201210282459.6A CN201210282459A CN102982301B CN 102982301 B CN102982301 B CN 102982301B CN 201210282459 A CN201210282459 A CN 201210282459A CN 102982301 B CN102982301 B CN 102982301B
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decodable code
reading terminal
indicia reading
illumination
band pass
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Y·丁
C·冯
Y·P·王
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Hand Held Products Inc
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    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
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    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
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Abstract

一种可解码标记读取终端，包括具有外壳窗口的外壳，设置在所述外壳内的多像素图像传感器，被配置为将可解码标记图像聚焦在所述图像传感器上的成像透镜，设置在所述图像传感器上入射光的光学路径上的光学带通滤波器，被配置为将从所述图像传感器读出的模拟信号转换成代表所述模拟信号的数字信号的模数(A/D)转换器，以及被配置为通过处理所述数字信号，输出与所述可解码标记对应的解码的消息数据的处理器。

Description

具有光学滤波器的可解码标记读取终端
相关申请的交叉引用
本申请要求2011年6月27日申请的发明名称为“具有光学滤波器的可解码标记读取终端”的美国专利申请No.13/170,104的优先权。上述申请的内容被整体引入合并于此。
技术领域
本发明大体涉及可解码标记读取终端，尤其涉及包括光学滤波器的光学标记读取终端。
背景技术
光学标记(例如条形码符号)用于产品和物品的识别，在本领域中已是公知的。可解码标记读取终端具有多种可用形式。例如，无键盘和显示器的最小特征条形码读取终端通常在销售点应用中。无键盘和显示器的可解码标记读取终端可被做成呈可辨认的枪型形状因子，其具有手柄和可被食指激励的触发器按钮(触发器)。也可做成具有键盘和显示器的可解码标记读取终端。装配有键盘和显示器的可解码标记读取终端通常被用于航运和仓储应用中，可被做成呈合并键盘和显示器的形状因子。在装配有键盘和显示器的可解码标记读取终端中，用于激励解码的信息的输出的触发器按钮常常设置在能够由操作者拇指实现激励的位置。装配有键盘和显示器的可解码标记读取终端，可被做成呈通常由具有相关联的触摸面板的显示器提供键盘和显示器的形式。无键盘和显示器形式的可解码标记读取终端或者装配有键盘和显示器形式的可解码标记读取终端通常被用在多种数据采集应用中，包括销售点应用、航运应用、仓储应用、安检点应用以及患者护理应用。可解码标记读取终端还可被做成呈呈现读取器的形状因子。这样的终端可以被安装在检验站。一些条形码读取终端适于读取条形码符号，包括一维(1D)条形码和二维(2D)条形码中的一个或者多个。
数字成像器是手持和零售扫描仪中的一种常见类型的扫描引擎，其包括1D(线性)成像器和2D(区域)成像器。数字成像器典型的使用透镜来聚焦条形码图像到多像素图像传感器上，该多像素图像传感器通常由基于CMOS或基于CCD的图像传感器提供，其将光信号转换成电信号。例如发光二极管(LED)等光源同时照亮条形码符号中所有的线条和空隙，以便捕获图像用于辨认和解码的目的。
发明内容
在一个实施例中，提供了可解码标记读取终端，其包括具有外壳窗口的外壳，设置在外壳内的多像素图像传感器，被配置为将可解码标记图像聚焦在图像传感器上的成像透镜，设置在图像传感器上入射光的光学路径上的光学带通滤波器，配置为将从图像传感器读取的模拟信号转换成代表模拟信号的数字信号的模数(A/D)转换器，配置为通过处理数字信号输出与可解码标记对应的解码的消息数据的处理器。该光学带通滤波器可被配置成通过两个或多个选择的波长范围的光，并消弱所述两个或多个所选范围之外的波长的光。
附图说明
结合下面的附图将更易于理解本发明。这些附图不必按照比例进行绘制，而是重在对本发明的原理进行说明。在下面附图中，采用相同的附图标记指示各个图中的相同部分。
图1-2示意性地说明了可解码标记读取终端的实施例。
图3是可解码标记读取终端一个实施例的部件示意图。
图4-6示意性地给出了根据一些示意实施例由可解码标记读取终端使用的光学带通滤波器的透射图。
具体实施方式
在图1所示的示意实施例中，提供了光学标记读取终端100，光学标记读取终端100包括外壳，该外壳包括头部54和手柄部56，其中手柄部56进一步包括把手58和触发器60。该触发器60可以被用于启动信号以激活帧读出和/或特定解码处理。该光学标记读取终端100的其他部件可以设置在外壳内。例如，图像传感器62可设置在外壳窗口63后面的头部54内。图像传感器62可以被配置成输出代表图像传感器上的入射光的电信号。
该光学标记读取终端100进一步包括I/O接口，在图1的示意实施例中，I/O接口可以与有线连接66通信耦合。I/O接口可以用于将该光学标记读取终端100通信耦合到配套设备68，配套设备68例如是销售点(POS)应用中的外围数据捕获设备和/或记录器。I/O接口的其他配置还可以采用不需要连线和/或有线连接66的接触型特征和/或无线通信技术。在标记读取终端100的特定应用中，配套设备68例如可由插接站(docking station)提供，该插接站具有用于交换功率和数据(包括由成像模块62捕获的图像数据)的相应匹配接触和/或连接器。
尽管没有被合并在图1的示意实施例中，但是光学标记读取终端100还可以包括大量的外围设备，包括用于显示由终端捕获的图像帧等的信息的显示器、键盘和指针设备(pointing device)。
光学标记读取终端100例如可被用于POS中的条形码读取和解码，以及其他应用。本领域技术人员可以理解光学标记读取终端100的其他应用在本公开的范围内。
具有可解码标记的产品可以被光学标记读取终端100扫描。此处使用的“可解码标记”意思是指信息的表示，例如用包括字母数字和非字母数字字符的字符串的条形码符号的表示。可解码标记可被用于例如用包括代表数字的12个编码的符号字符的UPC条形码来传递信息，例如产品的来源和型号的识别。光学标记读取终端可以被配置为输出与可解码标记对应的解码的消息数据。
图1给出了手持外壳，当然，本领域技术人员也可以理解终端外壳的其他类型和形状因子也在本公开的范围内。例如，在图2示意性示出的实施例中，可解码标记读取终端可以合并进具有呈现外壳(presentation housing)的POS工作站内。工作站包括水平的工作台面1012，用于放置要扫描的产品。安装在工作台面1012中的活检(bioptic)扫描仪1014包括第一外壳部分1016和第二外壳部分1018，该第二外壳部分1018可以从第一外壳部分的一端以基本上正交的方式突出。在一个实施例中，第一外壳部分1016包括基于激光的标记扫描终端，第二外壳部分1018包括基于成像器的终端。工作台面1012包括光学透明的(例如，玻璃)水平扫描窗口1020，该窗口1020安装为与收款台齐平，并被成像窗口保护板1022覆盖，该保护板1022设有隙缝1024a的图案。第二外壳部分1018进一步包括垂直扫描窗口1026，在它后面容纳有基于成像器的标记读取终端1028。本领域技术人员可以理解其他设置扫描仪和扫描窗口的方式也在本公开范围内。
在POS和其他许多的应用中，成像设备的关键挑战之一就是对强烈照明的需要。照明的强烈幅度直接与条形码扫描/成像设备的移动容忍性能有关。设备的用户满意度取决于设备所表现出的高移动容忍度，同时要求感知的照明强度尽可能低。
为了降低感知照明强度，条形码扫描/成像设备的外壳窗口可以被配置为只通过红色光谱区域的光。这种方法的好处包括更稳定的曝光和更均衡的图像。但是，红色外壳窗口会削弱其他(非红色)光谱区域的光，从而会产生单色的图像，可能会导致图像内容的损失。明净的外壳窗口，另一方面，则会通过所有未被滤除的彩色光谱，但会导致更强的感知照明。
为了应对上述挑战，在一实施例中，光学标记读取终端包括光学带通滤波器，该滤波器设置在图像传感器上入射光的光学路径上，并配置为平衡色彩内容和感知照明。在一个实施例中，光学带通滤波器被配置为通过一个或多个选择的波长范围的光，并削弱所选范围之外的波长的光。在另外一个实施例中，光学标记读取终端包括多带光学带通滤波器，该多带光学带通滤波器被配置为通过两个或多个选择的波长范围的光，并削弱所选范围之外的波长的光。具有多带光学带通滤波器的光学标记读取终端可被用于单色应用中，也可被用于彩色应用中。
图3示出了光学标记读取终端的一实施例的框图。光学标记读取终端100包括多像素图像传感器62，其在一实施例中可由电荷耦合器件(CCD)图像传感器提供。在另一实施例中，图像传感器62可由互补金属氧化物半导体(CMOS)图像传感器提供。本领域技术人员可理解其他类型的图像传感器在本公开范围内。
图像传感器62包括具有按像素行和列排列的像素的多像素图像传感器阵列3074、列电路3076和行电路3078。与图像传感器62相关联的是放大器电路3080和模数(A/D)转换器3082，模数(A/D)转换器3082配置成将从多像素图像传感器阵列3074读出的模拟信号形式的图像信息转换成数字信号形式的图像信息。还与图像传感器62相关联的是时序和控制电路3084，用于控制，例如图像传感器62的曝光周期，和/或应用于放大器3080的增益。所述的电路部件62、3080、3082和3084可以被封装在共同的图像传感器集成电路3086内。在一个实例中，图像传感器集成电路3086可由从美光科技(Micron Technology)公司得到的MT9V022图像传感器集成电路提供。在另外一个实例中，图像传感器集成电路3086可以合并拜耳(Bayer)模式滤波器。
在操作中，图像信号可从图像传感器62读出，被转换并存储在一个或多个存储器(例如RAM 3090)中。存储器3092包括RAM 3090，例如EPROM 3094等的非易失性存储器，以及例如由闪存或者硬驱动存储器所提供的储存装置3096。
在一个实施例中，光学标记读取终端100包括处理器3088，其被配置成读取存储在存储器3092中的图像数据，并能将这些图像数据应用到各种的图像处理算法中。在一个实施例中，处理器3088被配置为通过处理代表从图像传感器62读出的模拟信号的数字信号，来输出与扫描的可解码标记对应的解码的消息数据。
光学标记读取终端100还包括直接存储器访问单元(DMA)3098，用于路由从图像传感器62读出的经过转换的图像信息到RAM 3090。在另外一个实施例中，光学标记读取终端100可以使用系统总线，所述系统总线提供用于总线仲裁机制(例如，PCI总线)，这样就不再需要中央DMA控制器了。本领域技术人员可理解提供用于在图像传感器62和RAM 3090之间进行有效的数据传输的系统总线架构和/或直接存储器访问部件的其他实施例也在本公开范围内。
光学标记读取终端100还包括成像透镜组件3100，用于将可解码标记1032的图像聚焦到图像传感器62上。成像光线绕着光轴3102传输。光学标记读取终端100还包括照明组件3104，照明组件3104包括一个或多个照明光源库3106，所述照明光源库3106包括一个或多个LED以便生成与图像传感器62视野充分对应的照明图案。
在一个实施例中，每个照明LED都可以由具有不同光谱特征的多个管芯形成。在另一实施例中，一个或者多个照明LED可以具有不同的光谱特征。因此，照在光学标记上的光的光谱由单个LED上具有不同光谱特征的多个不同管芯形成，或者由具有不同光谱特征的多个LED形成。在进一步的方面，照在标记上的光的光谱在不同的标记区域可以改变。
在一个实施例中，光学标记读取终端100还可以包括瞄准图案光源库3108，其包括一个或者多个LED，用于生成瞄准图案。在操作中，以将瞄准图案投射到编码的符号字符上这种方式由终端100的操作者将终端100相对于产品定向。
另一方面，光学标记读取终端进一步包括光学带通滤波器3110，其设置在图像传感器上入射光的光学路径上。光学带通滤波器3110可被配置为通过一个或多个选择的波长范围的光，并削弱所选范围之外的波长的光。在一个实施例中，光学带通滤波器3110可以被配置为通过两个或多个选择的波长范围的光，并削弱所选范围之外的波长的光。
在图3所示的实施例中，光学带通滤波器3110可以设置在外壳窗口63和成像透镜组件3100之间。在另一实施例中，滤波器模块3110可以设置在，例如，但不限于，在成像透镜组件3100和图像传感器62之间，在成像透镜组件3100的表面，或者在图像传感器62的微透镜3077的表面。在另一实施例中，滤波器模块3110可以被，比如，但不限于，内置于成像透镜组件3100中，内置于图像传感器62的微透镜3077中，或者内置于外壳窗口63中。
在一个实施例中，光学带通滤波器3110可以使用一个或者多个多层涂层来制造，该多层涂层可被施加于光学透明基板。
在另一实施例中，光学带通滤波器3110可以使用周期结构来制造，该周期结构由单种材料或者多种不同材料形成，并在一维或者多维具有重复的特性。本领域技术人员可理解制造光学带通滤波器的其它技术在本公开范围内。
在进一步的方面，光学带通滤波器3110可通过以下特征进行描述：
中心波长(CWL)是通带中心的波长；
半最大值全宽(FWHM)是最大透射率50％处的带宽；
峰值透射率(T)是最大透射率的波长；
阻塞范围是滤波器不透射的光谱区域。
在一个实施例中，光学带通滤波器3110的CWL可被配置为与照明光光谱匹配。在图4所示的一个示意实施例中，光学带通滤波器CWL等于635nm，FWHM等于65nm以适应光线角度和LED变化(对于具有624nm的峰值波长、617nm的主导波长、公差+7/-5nm的琥珀色LED)。
在另一实施例中，光学带通滤波器包括额外的通带410，其可被配置为，例如，与白光的蓝色峰值匹配，如图5所示。在另一实施例中，光学带通滤波器包括额外的通带，其被配置为与便携式通信设备的屏幕所发射的背光匹配，这样的便携式通信设备，例如是，但不仅限于，PDA或者蜂窝电话。
在另一实施例中，光学带通滤波器包括两个额外的通带510、520，其被配置为，例如，与白光的蓝色峰值和绿色峰值匹配，如图6所示。
在进一步的方面，光学标记读取终端100包括各种控制电路。透镜组件3100可使用透镜组件控制电路3114来控制，而包括照明图案光源库3106和瞄准图案光源库3108的照明组件3104可使用照明组件控制电路3116来控制。滤波器模块3110可使用滤波器模块控制电路3118来控制，滤波器模块控制电路3118与制动器组件3112耦合。透镜组件控制电路3114发送信号到透镜组件3100，例如，用于改变透镜组件3100的焦长和/或最优焦距。照明组件控制电路3116发送信号到照明图案光源库3106，例如，用于改变照明输出的等级。
在进一步的方面，光学标记读取终端100包括各种接口电路，用于将一些外围设备与系统地址/数据总线(系统总线)总线3120耦合，从而与处理器3088通信，该处理器3088也与系统总线3120耦合。光学标记读取终端100包括用于将图像传感器时序和控制电路3084与系统总线3120耦合的接口电路3122，用于将透镜组件控制电路3114与系统总线3120耦合的接口电路3124，用于将照明组件控制电路3116与系统总线3120耦合的接口电路3126，用于将显示器3130与系统总线3120耦合的接口电路3128，用于将键盘3134、指针设备3136和触发器3060与系统总线3120耦合的接口电路3132，用于将滤波器模块控制电路3118与系统总线3120耦合的接口电路3138。
在进一步的方面，光学标记读取终端100包括一个或者多个I/O接口3140、3142，用于提供与外部设备(例如，收银机服务器、商店服务器、库存设施服务器、局域网基站、蜂窝基站)的通信。I/O接口3140、3142可以是已知的计算机接口的任何组合的接口，所述已知的计算机接口例如是以太网(IEEE 802.3)，USB，IEEE 802.11，蓝牙，CDMA和GSM，并且I/O接口3140、3142可以与处理器(例如接口微控制器)和存储器耦合，以执行部分或者全部文中所述的功能。
虽然通过参照大量具体实施例描述了本发明，可以理解的是，本发明的真正精神和范围仅由本说明书支持的权利要求来确定。而且，虽然在这里的很多情况下，系统、装置和方法被描述为具有特定数量的元件，可以理解的是，这种系统、装置和方法可以用比所提及特定数量的元件更少的元件来实现。此外，虽然已经描述了多个特定实施例，可以理解的是，参照每个特定实施例的已经描述的特征和方面可以和每个其余的特定描述的实施例一起使用。
本文描述的系统和方法实例如下：
A1.一种可解码标记读取终端，包括：
包括外壳窗口的外壳；
设置在所述外壳内的多像素图像传感器；
成像透镜，被配置为将可解码标记图像聚焦在所述图像传感器上；
光学带通滤波器，设置在所述图像传感器上入射光的光学路径上，所述光学带通滤波器被配置为通过两个或多个选择的波长范围的光，并消弱所述两个或多个所选范围外的波长的光；
模数(A/D)转换器，被配置为将从所述图像传感器读出的模拟信号转换成代表所述模拟信号的数字信号，所述模拟信号代表所述图像传感器上的入射光；以及
处理器，被配置为通过处理所述数字信号，输出与所述可解码标记对应的解码的消息数据。
A2.如A1所述的光学标记读取终端，被配置为以单色模式和彩色模式来捕获图像。
A3.如A1所述的光学标记读取终端，其中所述光学带通滤波器被设置在所述外壳窗口和所述成像透镜之间。
A4.如A1所述的光学标记读取终端，其中所述光学带通滤波器被设置在所述成像透镜组件和所述图像传感器之间。
A5.如A1所述的光学标记读取终端，其中所述光学带通滤波器被设置在所述成像透镜组件的表面。
A6.如A1所述的光学标记读取终端，其中所述多像素图像传感器包括微透镜；并且
其中所述光学带通滤波器设置在所述微透镜的表面。
A7.如A1所述的光学标记读取终端，其中所述光学带通滤波器被内置于所述成像透镜组件中。
A8.如A1所述的光学标记读取终端，其中所述多像素图像传感器包括微透镜；并且
其中所述光学带通滤波器被内置于所述微透镜中。
A9.如A1所述的光学标记读取终端，其中所述光学带通滤波器被内置于所述外壳窗口内。
A10.如A1所述的光学标记读取终端，其中所述滤波器包括多层涂层。
A11.如A1所述的光学标记读取终端，其中所述滤波器包括周期结构。
A12.如A1所述的光学标记读取终端，进一步包括一个或者多个照明LED，所述照明LED被配置为照明承载可解码标记的基板。
A13.如A1所述的光学标记读取终端，进一步包括一个或者多个具有不同光谱特征的照明LED，所述一个或者多个照明LED被配置为照明承载可解码标记的基板。
A14.如A1所述的光学标记读取终端，进一步包括一个或者多个照明LED，所述一个或者多个照明LED中的每个照明LED均包括一个或者多个具有不同光谱特征的管芯；
其中所述一个或者多个照明LED被配置为照明承载可解码标记的基板。
A15.如A1所述的光学标记读取终端，进一步包括一个或者多个照明LED，其被配置为通过发射具有照明光光谱的光来照明承载可解码标记的基板；
其中所述照明光光谱在所述基板的不同区域改变。
A16.如A1所述的光学标记读取终端，进一步包括一个或者多个照明LED，其被配置为通过发射具有照明光光谱的光来照明所述基板；
其中所述光学带通滤波器的中心波长被配置为与所述照明光光谱匹配。
A17.如A1所述的光学标记读取终端，其中所述光学带通滤波器包括被配置为与便携式通信设备发射的背光匹配的通带。
A18.如A1所述的光学标记读取终端，其中所述外壳由手持外壳提供。
A19.如A1所述的光学标记读取终端，其中所述外壳由销售点工作站外壳提供。
A20.如A1所述的光学标记读取终端，其中所述外壳由呈现外壳提供。
虽然通过参照大量具体实施例描述了本发明，可以理解的是，本发明的真正精神和范围仅由本说明书支持的权利要求来确定。而且，虽然在这里的很多情况下，系统、装置和方法被描述为具有特定数量的元件，可以理解的是，这种系统、装置和方法可以用比所提及特定数量的元件更少或更多的元件来实现。此外，虽然已经描述了多个特定实施例，可以理解的是，参照每个特定实施例的已经描述的特征和方面可以和每个其余的特定描述的实施例一起使用。

Claims (15)

1.一种可解码标记读取终端，包括：
包括外壳窗口的外壳；
设置在所述外壳内的多像素图像传感器；
成像透镜，被配置为将可解码标记图像聚焦在所述图像传感器上；
光学带通滤波器，设置在所述图像传感器上入射光的光学路径上，所述光学带通滤波器被配置为通过两个或更多个选择的波长范围的光，并消弱所述两个或更多个所选范围外的波长的光；
模数（A/D）转换器，被配置为将从所述图像传感器读出的模拟信号转换成代表所述模拟信号的数字信号，所述模拟信号代表所述图像传感器上的入射光；以及
处理器，被配置为通过处理所述数字信号，输出与所述可解码标记对应的解码的消息数据。
2.如权利要求1所述的可解码标记读取终端，被配置为以单色模式和彩色模式来捕获图像。
3.如权利要求1所述的可解码标记读取终端，其中所述多像素图像传感器包括微透镜；并且
其中所述光学带通滤波器设置在所述微透镜的表面。
4.如权利要求1所述的可解码标记读取终端，其中所述光学带通滤波器被内置于所述成像透镜中。
5.如权利要求1所述的可解码标记读取终端，其中所述多像素图像传感器包括微透镜；并且
其中所述光学带通滤波器被内置于所述微透镜中。
6.如权利要求1所述的可解码标记读取终端，其中所述光学带通滤波器包括多层涂层。
7.如权利要求1所述的可解码标记读取终端，其中所述光学带通滤波器包括周期结构。
8.如权利要求1所述的可解码标记读取终端，进一步包括一个或者多个照明LED，所述照明LED被配置为照明承载可解码标记的基板。
9.如权利要求1所述的可解码标记读取终端，进一步包括具有不同光谱特征的一个或者多个照明LED，所述一个或者多个照明LED被配置为照明承载可解码标记的基板。
10.如权利要求1所述的可解码标记读取终端，进一步包括一个或者多个照明LED，所述一个或者多个照明LED中的每个照明LED均包括一个或者多个具有不同光谱特征的管芯；
其中所述一个或者多个照明LED被配置为照明承载可解码标记的基板。
11.如权利要求1所述的可解码标记读取终端，进一步包括一个或者多个照明LED，其被配置为通过发射具有照明光光谱的光来照明承载可解码标记的基板；
其中所述照明光光谱在所述基板的不同区域改变。
12.如权利要求8所述的可解码标记读取终端，进一步包括一个或者多个照明LED，其被配置为通过发射具有照明光光谱的光来照明所述基板；
其中所述光学带通滤波器的中心波长被配置为与所述照明光光谱匹配。
13.如权利要求1所述的可解码标记读取终端，其中所述光学带通滤波器包括被配置为与便携式通信设备发射的背光匹配的通带。
14.如权利要求1所述的可解码标记读取终端，其中所述外壳由手持外壳提供。
15.如权利要求1所述的可解码标记读取终端，其中所述外壳由呈现外壳提供。
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US20160110578A1 (en) 2016-04-21
EP2541463A1 (en) 2013-01-02
US8636215B2 (en) 2014-01-28
CN102982301A (zh) 2013-03-20
EP2541463B1 (en) 2014-07-23
US9489557B2 (en) 2016-11-08
US20120325911A1 (en) 2012-12-27
US9224025B2 (en) 2015-12-29

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