CN203149594U - 使用极其延长的激光扫描光束的条形码符号读取系统 - Google Patents
使用极其延长的激光扫描光束的条形码符号读取系统 Download PDFInfo
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- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10544—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation by scanning of the records by radiation in the optical part of the electromagnetic spectrum
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- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/14—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation using light without selection of wavelength, e.g. sensing reflected white light
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Abstract
使用极其延长的激光扫描光束的条形码符号读取系统,包括外壳,具有光透射窗口;极其延长的激光光束产生模块,产生极其延长的激光光束,具有(i)沿着z参考方向延伸的传播方向,(ii)由y参考方向表示的高度尺寸,(iii)由x参考方向表示的宽度尺寸,x、y、和z方向互相垂直。每个极其延长的激光光束特征在于延长比率(ER),对于沿着z方向延伸的在激光扫描条形码符号读取系统的工作范围中的任何点,定义为Y/X>4.5;(i)Y表示极其延长的激光光束在Y参考方向上测量的光束高度,并且X表示极其延长的激光光束在X参考方向上测量的光束宽度,(iii)光束高度(Y)和激光光束宽度(X)在l/e2强度削波水平上被测量。还提供激光扫描机制。
Description
技术领域
本公开涉及在条形码符号读取系统中的改进,其使用具有改进的激光光束特性的激光扫描光束,其能够以增强的性能水平读取低质量和/或损坏的条形码符号。
背景技术
众所周知,低质量的条形码和损坏的条形码典型地导致在销售点终端(POS)上的吞吐量降低。
已经开发各种技术来读取低质量的条形码以及损坏的条形码。这些技术包括使用:(i)自适应信号处理增益调节和阈值级别(通常在跨越条形码的一些扫描时段上执行);(ii)降低的信号处理带宽以限制扫描数据的高频分量(也就是限制扫描器分辨率);(iii)改进解码算法以允许在条形码打印中的噪声;以及(iv)编结算法以从部分成功尝试中获取整体解码以获取整个条形码结果。
除了以上技术,公知的有在激光光束扫描运动的截面方向中使用延长的激光光束,以便帮助平衡空间噪声并改善激光扫描条形码读取系统的信噪比(SNR)。这项技术可以用来读取1D和2D堆叠的条形码符号。
例如,美国专利No.5,621,203公开了为扫描2D堆叠的条形码符号而使用延长的激光光束,并使用线性图像检测器检测反射光。如所公开的,延长的激光光束向延长的截面维度发散。并且,光束的延长截面维度在符号表面上,优选足够长以在一次照亮一行符号的整个一维。光束优选不聚集到延长截面维度的腰部。
图1示出了条形码读取器1,其跨越条形码符号116扫描传统延长的激光光束10。图2A1示出了优质UPC条形码符号,其由来自图1的条形码符号读取器的传统延长的激光扫描光束10扫描。在使用传统延长的激光扫描光束10来扫描该优质码符号时所产生的反射率强度分布图(reflectance intensity profile)在图2A2中示出。
图2B1示出了一种降低质量的UPC条形码符号,其由从图1的激光扫描条形码符号读取器生成的传统延长的激光扫描光束10扫描。图2B2示出了利用图1的条形码符号读取器生成的传统延长激光扫描光束由该降低质量的条形码符号生成的反射率分布图。
图2C1示出了优质堆叠2D条形码符号的第二层,其由从图1的激光扫描条形码符号读取器所产生的传统延长的激光扫描光束10扫描。图2C2示出了利用从图1的条形码符号读取器生成的传统延长激光扫描光束10由堆叠的2D条形码符号生成的反射率分布图。
使用传统延长的激光光束来扫描具有2D表面噪声的条形码符号结构消除(也就是经过空间均衡)这样的码符号的反射率强度分布图,这反过来增加了条形码符号读取器的信噪比(SNR)性能。
激光光束的延长比率(ER)(其被定义为在激光扫描光束的光束行进方向(Z)上测量的激光光束高度(y)和激光光束宽度(x)的比率)提供激光光束相对于扫描维度(也就是x方向),沿着交叉(也就是y)光束扫描维度被延长多少的度量。对于已知的常规激光扫描系统,跨越常规激光扫描条形码符号读取系统的工作范围,激光光束延长比率(ER)测量范围为1到大约4.5,如图2D所示。
但是,至今仍几乎不可知或没有公开,如何为激光扫描条形码符号读取系统优化光束的延长比率(ER),以在读取不同类型符号(例如UPC、GS1 2D 堆叠条形码等)的低质量或损坏的条形码符号时实现增强的SNR性能水平。
因此,强烈需要对在激光扫描条形码符号期间所检测到的反射强度信号的SNR进行改进,并且对于这种改进使用具有优化的激光光束特性的激光扫描光束来实现,同时避免现有装置和方法的短处和缺点。
发明内容
因此,本公开的主要目的是提供一种新的和改进的方式和方法来改进在激光扫描条形码符号期间检测到的反射强度信号的SNR,并为此使用具有优化的激光光束特性的激光扫描光束,同时避免了现有装置和方法的短处和缺陷。
本公开涉及一种用于扫描低质量或损坏的条形码符号的使用极其延长的激光扫描光束的条形码符号读取系统,所述激光扫描系统具有工作范围,并包括:
外壳,具有光透射窗口;
极其延长的激光光束产生模块,用于产生极其延长的激光光束,具有i沿着z参考方向延伸的传播方向,ii由y参考方向表示的高度尺寸,以及iii由x参考方向表示的宽度尺寸,其中x、y、和z方向互相垂直;
其中所述极其延长的激光光束的特征在于延长比率ER,对于沿着所述z方向延伸的在所述激光扫描条形码符号读取系统的工作范围内的任何点,其定义为Y/X>4.5;
其中iY表示所述极其延长的激光光束在所述Y参考方向上测量的光束高度,并且X表示所述极其延长的激光光束在所述X参考方向上测量的光束宽度,并且iii所述光束高度Y和所述激光光束宽度X在1/e2强度削波水平上被测量;以及
激光扫描机构,用于扫描来自所述光透射窗口以及跨越在外壳外部所定义的扫描域的所述极其延长的激光光束,在该扫描域中存在要由所述极其延长的激光扫描光束扫描的条形码符号
另一目的是提供通过使用具有极其延长的交叉扫描维度的激光扫描光束来扫描这样的条形码符号的新的和改进的读取低质量和损坏的条形码的方式,这样均衡在激光扫描操作期间条形码符号中的缺陷。
另一目的是对于以下情况提供一种使用具有可以被量化为Y/X>4.5的延长比率(ER)的极其延长的激光光束的条形码符号读取系统(i)对于在激光扫描条形码扫描器的工作范围内(也就是沿着扫描器的Z方向)的任何点;(ii)其中Y表示在交叉扫描方向或Y维度激光光束中测量的激光光束高度,以及X表示在扫描方向或激光光束的X维度中测量的激光光束宽度;以及(iii)其中激光光束高度(Y)和激光光束直径(X)在1/e2强度削波水平(clip level)上被测量。
另一目的是提供条形码符号读取系统,其使用弯曲的镜,用于沿系统的工作范围内的光束传播长度生成延长比率(ER)大于4.5的激光光束延长,以便提高系统的SNR性能。
另一目的是提供条形码符号读取系统,其使用圆柱形透镜,用于沿系统的工作范围内的光束传播长度生成延长比率(ER)大于4.5的激光光束延长,以便提高系统的SNR性能。
另一目的是提供条形码符号读取系统,使用极其延长的激光光束,其还可用于双光学器件激光扫描系统、全方位激光扫描系统以及激光照明线性成像系统中。
另一目的是提供条形码符号读取系统,使用极其延长的激光光束,其被设计成平衡GS1合成堆叠码性能与低质量码性能。
另一目的是提供条形码符号读取系统,使用极其延长的激光光束,其可用于在读取器的工作范围上,以及在最高分辨率的点(也就是光束腰部)上读取低质量条形码符号。
另一目的是提供条形码符号读取系统,使用极其延长的激光光束,在系统的光透射窗口开始2.36英尺(也就是60mm)值的光束分布图的腰部处发生极其延长。
这些和其他目的将在之后以及所附权利要求中变得更加显然。
附图说明
为了更完整理解上述目的,以下示例性实施例的详细描述应当与附图结合来阅读,其中:
图1是使用了传统延长激光扫描光束的用于读取条形码符号的可手持式激光扫描条形码符号读取器的透视图;
图2A1是优质或完美质量的UPC条形码的图示,其被由图1的可手持式激光扫描条形码符号读取器所产生的传统延长的激光扫描光束所扫描;
图2A2是由图1的可手持式激光扫描条形码符号读取器投射的,并用于扫描图2A1中所示的UPC条形码符号的传统延长激光扫描光束所产生的反射率分布图的图示;
图2B1是由图1的可手持式激光扫描条形码符号读取器产生的传统延长激光扫描光束对降低质量的UPC条形码符号进行扫描的图示;
图2B2是由图1的可手持式激光扫描条形码符号读取器投射的,并用于扫描图2B1中所示的降低质量的UPC条形码符号的传统延长激光扫描光束所产生的反射率分布图的图示;
图2C1是由图1的可手持式激光扫描条形码符号读取器产生的传统延长激光扫描光束对完美堆叠2D条形码符号的第二层进行扫描的图示;
图2C2是由图1的可手持式激光扫描条形码符号读取器投射的,并用于扫描图2C1中所示的堆叠2D条形码符号的传统延长激光扫描光束所产生的反射率分布图的图示;
图2D是示出作为沿着光束传播方向(Z)的位置函数的传统延长激光光束的延长比率(Y/X)的图示;
图3是根据本公开的,使用极其延长的激光扫描光束的用于读取条形码符号的可手持式激光扫描条形码符号读取器的透视图;
图4是描述在图3的可手持式激光扫描条形码符号读取器内的初始系统部件的示意框图;
图5A是在图3的可手持式激光扫描条形码符号读取器中所使用的激光光束产生模块的透视图;
图5B是图5A中所示的,并用于图3的可手持式激光扫描条形码符号读取器中的激光光束产生模块的分解透视图;
图5C是图5A中所示的,并用于图3的可手持式激光扫描条形码符号读取器中的激光光束产生模块的分解侧视图;
图5D是图5A中所示的整体装配的激光光束产生模块的截面图;
图6是激光光束产生模块/组件的可替换实施例的透视图,其能够在图3的可手持式激光扫描条形码符号读取器中使用,并且显示在激光光束产生模块外部包括延长反射元件以代替在图5A到5D所示出的实施例中所使用的延长透镜;
图7是用于图3的可手持式激光扫描条形码符号读取器中使用的激光扫描光束产生模块的光学模型的示意图,阐述了极其延长激光扫描光束投射到降低质量的条形码符号上和跨越降低质量的条形码符号扫描的光束分布图的1/e2扫描和交叉扫描维度;
图7A是由图3的激光扫描条形码符号读取器所产生的极其延长激光扫描光束在扫描时刻的线性条形码符号的示意图,描述了x和y扫描参考方向并定义了延长比率(ER=Y/X);
图7B是说明了由图3的激光扫描条形码符号读取器所产生的极其延长激光扫描光束的x扫描维度(也就是宽度)的图示,绘制成作为沿着激光扫描光束的传播方向(z)的距离的函数;
图7C是说明了由图3的激光扫描条形码符号读取器所产生的极其延长激光扫描光束的y扫描维度(也就是高度)的图示,绘制成作为沿着激光扫描光束传播方向(z)的距离的函数;
图7D是示出了传统延长激光光束的延长比率(Y/X)作为沿着光束行进方向(Z)的位置的函数的图示,并且作为比较,极其延长激光光束的延长比率(Y/X)作为沿着光束行进方向(Z)的位置的函数的图示;
图7E是示出了在图7中所示的x腰部位置处测量的传统延长强度分布图与在x腰部位置处测量的极其延长强度分布图的比较绘图的图示;
图8是描述在图3的可手持式激光扫描条形码符号读取器的操作期间所涉及的步骤的流程图;
图9A是由从图3的可手持式激光扫描条形码符号读取器产生的极其延长激光扫描光束扫描的完美UPC条形码符号的图示;
图9B是由从图3的可手持式激光扫描条形码符号读取器投射的极其延长(E2)激光扫描光束,在用于扫描图9A中所示的完美UPC条形码符号时,所产生的反射率分布图的图示;
图10A是由从图3的可手持式激光扫描条形码符号读取器产生的极其延长激光扫描光束扫描降低质量的UPC条形码符号的图示;
图10B是由从图3的可手持式激光扫描条形码符号读取器投射的极其延长(E2)激光扫描光束,在用于扫描图10A中所示的降低质量的UPC条形码符号时,所产生的反射率分布图的图示;
图11A是由从图3的可手持式激光扫描条形码符号读取器产生的极其延长激光扫描光束扫描高质量的堆叠2D条形码符号第二层的图示,其中极其延长激光光束在扫描平面上的高度(y)尺寸大于在2D堆叠条形码符号的第二层中条形元件的高度尺寸;
图11B是由从图3的可手持式激光扫描条形码符号读取器投射的极其延长激光扫描光束在用于扫描图11A中所示的堆叠2D条形码符号时所产生的反射率分布图的图示;
图12是示出在性能比较的情况下常规和极其延长激光光束的信噪比(SNR)度量的图示,分别扫描具有0.25[mm2]表面积的参考缺陷的条形码符号,并以图1和3中所示的激光扫描条形码符号读取系统中使用的光电检测器检测反射的光强度。
具体实施方式
参考附图中的图形,数字成像系统的示例性实施例将更详细地进行描述,其中相似的元件使用相似的参考数字来表示。
使用极其延长的激光扫描光束来提高质量差的和受损的条形码符号的读取性能的示例性实施例的条形码符号读取系统的详细说明
现在参考图3到8,将详细描述手动触发/自动触发的可手持式激光扫描条形码符号读取系统1的示例性实施例。
如在图3和4中所示的,激光扫描条形码符号读取器100包括:可手持式外壳102,其具有头部和支持头部的手柄部,所述外壳也可以是固定安装的外壳;光透射窗口103,其与外壳102的头部集成;手动激活的双位触发开关104,其与外壳的手柄部分集成,用于激活其激光扫描模块105以具有激光扫描域115;基于IR的对象检测子系统219,其在激光扫描域内产生IR光束,如在图3中所示的,用于自动地检测在激光扫描域中对象的存在,以及当对象在扫描域中被自动地检测时触发系统;激光扫描模块105,用于跨越激光扫描域重复地扫描可见的极其延长的激光光束113,其由极其延长的激光光束生成模块155产生;其中激光扫描模块105还包括用于从系统控制器150接收控制信号的激光驱动电路151,以及响应于此,产生并递送激光(二极管)驱动电流信号到激光源112,以在图8中所描述的条形码符号读取的方法期间产生极其延长的激光扫描光束;集光光学器件106,用于收集从扫描域中的被扫描的对象反射/散射的光,以及光电检测器,用于检测所收集光的强度并在扫描操作期间产生相应于所述检测到的光强度的模拟扫描数据信号;模拟扫描数据信号处理器/数字化转换器107,用于处理该模拟扫描数据信号并将处理的模拟扫描数据信号转换为数字扫描数据信号,其然后被转换为表示在被扫描的码符号结构中条形和空白的相对宽度的数字字;可编程的解码处理器108,用于解码处理数字化数据信号,以及生成表示由极其延长激光扫描光束114B所扫描的每个条形码符号的符号字符数据;输入/输出(I/O)通信接口模块140,用于与主机通信系统对接,并经由通过符号读取器和主机系统支持的有线或无线通信链路来向那里传输符号字符数据;以及系统控制器150,用于生成必要的控制信号用于控制在可手持式激光扫描条形码符号读取系统内的操作。
如在图4中所示的,激光扫描模块105包括若干子部件,即:激光扫描组件110,其具有电磁线圈128和可旋转的扫描元件(例如,镜)134,用于支撑轻型反射元件(例如,镜)134A;线圈驱动电路111,用以产生电驱动信号来驱动在激光扫描组件110中的电磁线圈128;以及激光光束源112和相关联的光学器件161、163和164,用于生成极其延长的激光光束113;以及光束偏转镜114,用于将激光光束113偏转为朝向激光扫描组件110的镜组件的入射光束114A,其跨越在系统操作期间可同时出现的激光扫描域以及条形码符号116扫描偏转的激光光束114B。
如在图4中所示的,激光扫描模块105典型地被安装在光具座上,印刷电路(PC)板或激光扫描组件也位于其上的其他表面上,并且包括线圈支撑部分110,用于支撑电磁线圈128(在永久磁体135附近),并且其由驱动电路111来驱动使得它在扫描组件操作期间在永久磁体135的相对极上产生磁力。
优选地,基于IR的对象检测子系统219被安装在其光透射窗口103的前方使得子系统219的IR光发射器和IR光接收器部件在该系统的激光扫描域中的对象具有自由视野,如在图3中所示的。此外,IR对象存在检测模块219能够传输IR信号到扫描域115,该IR信号具有连续的低强度输出电平,或者具有脉冲的较高强度输出电平,其可在一些条件下被使用以增加系统的对象检测范围。在可替换实施例中,本领域公知地,IR光发射器和IR光接收器部件可以分别实现为可见光(例如红光)发射器和可见光(例如红光)接收器部件。典型地,对象检测光束将被调制并且同步检测,如美国专利号No.5,340,971中所教导的,其在此并入以作参考。
如在图5A、5B中所示的,极其延长的激光光束生成模块155包括:激光源112(例如VLD 可见激光二极管,LD),安装在轭组件160中,具有聚焦/准直透镜(即,4.0[mm]焦距)161;透镜固定器162,用于固定聚焦/准直透镜161,以及孔径光阑(aperture stop)163,其具有0.94[mm]圆直径,并且还沿着聚焦透镜161、延长透镜163和VLD112的共同光轴165固定延长的柱面透镜(具有曲率半径50[mm])163,如在图5D中所示的。
激光光束生成模块155的主要目的是生成极其延长的激光光束113(114B),其可被量化为Y/X>4.5,(i)对于在激光扫描条形码扫描器的工作范围内(即,沿着Z方向)的任何点;(ii)其中Y表示在交叉扫描方向或Y维度激光光束测量的激光光束高度,并且X表示在扫描方向或激光光束X维度中测量的激光光束宽度;以及(iii)其中激光光束高度(Y)和激光光束直径(X)在1/e2强度削波水平(clip level)上被测量。已经发现了该延长比率阈值,通过使用在交叉扫描(Y)维度上延长的激光扫描光束来解决读取质量差的和受损的条形码的问题从而平衡在激光扫描条形码符号结构中的缺陷。所述延长比率在所述条形码符号读取系统的工作范围上沿着所述z参考方向大于4.5。所述延长比率具有大于9.0的峰值,其发生在所述极其延长的激光扫描光束的腰部处。
通过定义,在扫描(x)方向中的光束腰部是激光光束在x维度中的最小点,并且如在图7中所示的,光束腰部位于Z方向中大约60[mm]处。如图7C中所示的,在Y维度中没有光束腰部,因为极其延长的激光光束114B沿着Z维度是完全发散的。在图7B和7C中,所有激光光束维度值在1/e2削波水平上测量。如图7中所示的,极其延长的激光光束113从扫描器正面周围1英尺极其延长,从此直到大约9英尺,峰值延长发生在光束分布图的腰部处,在2.36英尺(即,60[mm])的值处。
极其延长的激光光束生成模块155的可替换实施例(在图6中被示为155,)能够实现为组件,包括:激光源122(例如VLD LD),安装在轭组件160中,具有聚焦/准直透镜(即,4.0[mm]焦距)161;透镜固定器162,用于固定聚焦透镜161,具有孔径光阑163,其具有0.94[mm]的圆直径,沿着聚焦透镜161和VLD112的共同光轴165,如图6中所示的;以及反射型光束延长光学元件(例如镜)163,,其具有大约95.54[mm]的曲率半径o。
激光光束生成模块155,的目的是产生具有极其延长的激光光束113,其可被定义为或相反地量化为Y/X>4.5(i)对于在激光扫描条形码扫描器的工作范围内(即,沿着Z方向或光束行进的方向)的任何点;(ii)其中Y表示在交叉扫描方向或Y维度激光光束测量的激光光束高度,并且X表示在扫描方向或激光光束X维度中测量的激光光束宽度;以及(iii)其中激光光束高度(Y)和激光光束直径(X)在1/e2强度削波水平上被测量。。在所有其他方面中,使用图6中极其延长的激光光束生成模块155,所生成的激光光束113的激光光束特征,与使用图5A到图5D中所示的极其延长的激光光束生成模块155所生成的激光光束特征类似。
图7D示出了作为沿着光束行进方向(Z)的位置函数的传统的延长激光光束的延长比率(Y/X),并且作为比较,作为沿着光束行进方向(Z)的位置函数的极其延长激光光束的延长比率(Y/X)。在图7D中还示出了,本领域公知地,对于沿着激光扫描系统的工作距离上的任何位置(z),本公开的极其延长激光光束的延长比率(ER)显著大于任何传统的延长激光光束的延长比率。
图7E示出了在图7中所示的x腰部位置处测量的传统延长强度分布与在x腰部位置处测量的极其延长强度分布的比较图。
图7B和7C示出了作为光束行进Z函数分别绘制的极其延长激光扫描光束114B的X和Y维特征。图7D示出了本公开的激光扫描光束的延长比率相对距离(z)特征。特别地,在沿着激光光束行进的任何点Z上,其中Y和X横截面维度相等,激光光束的横截面在该点上是圆形(即,ER=Y/X=1)。为了实现ER大于4.5,或者激光光束的Y维度必须比其X维度发散得更快,或者激光光束的X维度在发散之前必须聚焦到腰部处。如在图7D中所示的,图3到图7E中所示的说明性实施例的ER相对Z绘制图,是极其延长激光光束的X维度在发散前聚焦到腰部的结果,如在图7D中所示的,而如图7C中所示的,Y维度正发散,由此在图7D和7E中所示的X腰部位置处创建ER峰值。
一般来说,系统100支持人工触发的触发操作模式,并且也支持自动触发的操作模式,如下所述。
响应于触发事件(即,人工拉动触发器104),激光扫描模块105通过光透射窗口103并且跨越可手持式外壳外部的激光扫描域115生成并投射极其延长的激光扫描光束114B,用于扫描在扫描域中的对象。响应于系统控制器150所生成的控制信号,由激光光束源112和光学器件161、163和164生成激光扫描光束。扫描元件(即,机械装置)134跨越位于激光扫描域115的附近部分或远端部分的对象上的码符号重复扫描所选择的激光光束。然后,集光光学器件106收集从在扫描域中对象上的被扫描的码符号反射/散射的光,并且光电检测器(106)自动检测所收集的光的强度(即,光子能量),并产生相应于在扫描操作期间检测到的光强度的模拟扫描数据信号。模拟扫描数据信号处理器/数字转换器107处理该模拟扫描数据信号,并将该处理的模拟扫描数据信号转换为数字数据信号。可编程的解码处理器108解码处理数字化数据信号,并且产生表示由极其延长的激光扫描光束114B扫描的每个条形码符号的符号字符数据。相应于由解码器108读取的条形码的符号字符数据然后通过本领域公知的可以支持有线和/或无线通信链路的I/O通信接口140被传送给主机系统。在对象检测和激光扫描操作期间,系统控制器150产生必要的控制信号以控制在可手持式激光扫描条形码符号读取系统100内的操作。
响应于通过基于IR的对象存在检测子系统225在激光扫描域115中对象的自动检测,激光扫描模块105通过光透射窗口103并且跨越可手持式外壳外部的激光扫描域115生成并投射极其延长的激光扫描光束114B,用于扫描在扫描域中的对象。响应于系统控制器150生成的控制信号,激光源112生成激光扫描光束114B。扫描元件(即,机械装置)134跨越包含条形码符号116的扫描域115重复地扫描激光光束114B。然后,激光光学器件106收集从在扫描域中对象上的被扫描的码符号反射/散射的光,并且光电检测器(106)自动检测所收集光的强度(即,光子能量),并产生相应于在扫描操作期间检测到的光强度的模拟扫描数据信号。模拟扫描数据信号处理器/数字转换器107处理该模拟扫描数据信号,并将该处理的模拟扫描数据信号转换为数字数据信号。可编程的解码处理器108解码处理数字化数据信号,并且产生表示由极其延长的激光扫描光束114B扫描的每个条形码符号的符号字符数据。相应于由解码器108读取的条形码的符号字符数据然后通过本领域公知的可以支持有线和/或无线通信链路的I/O通信接口140被传送给主机系统。在对象检测和激光扫描操作期间,系统控制器150产生必要的控制信号以控制在可手持式激光扫描条形码符号读取系统100内的操作。
参考图8,在激光扫描条形码读取器100中读取条形码符号和控制操作的方法将在下文更详细的描述。
如图8中所示的,配合系统控制器150的过程在开始块中开始,其中所有系统部件被激活。如在图8中的块A1处所指示的,系统控制器150继续确定在视场(FOV)中的任何位置处何时检测对象,并且当该事件发生时,系统控制器在块A2处确定基于IR的对象检测子系统225是否检测到在扫描域115附近部分中的对象。如果在扫描域附近部分中检测到对象,然后块B处,系统控制器指示激光扫描模块105使用由VLD112以及在图5A到5D中所示的相关联的轭组件155或图6中所示的155,所生成的极其延长的激光光束114B扫描检测到的对象。
在块C,解码处理器108在所捕获的扫描数据上运行解码算法,并且如果在块D,条形码符号被解码,那么在块E,所生成的符号字符数据被传送到主机系统,并且系统控制器返回到块A1。但是如果在块D,条形码符号没有被解码,则系统控制器150在块F1确定是否已经达到最大扫描尝试阈值,并且如果没有达到,则系统控制器150返回到块B,并恢复如所指示的流程。但是如果在块F1,系统控制器150确定已经完成了最大扫描尝试阈值,则可选地,系统控制器150进行到块F2并发送解码失败的通知给操作者,并返回到块A1。
如果在块A2,没有在激光扫描域115的附近部分中检测到对象,那么在图8中的块G,系统控制器指示激光扫描模块105使用由VLD112以及在图5A到5D中所示的关联的轭组件155或图6中所示的155,所生成的极其延长激光光束114B扫描检测到的对象。然后在块H,在收集的扫描数据上运行一个或多个解码算法,并且在块I,系统控制器150确定条形码符号是否被解码处理器108解码。如果在块I条形码符号被解码,则在块J,所生成的符号字符数据被传送到主机系统,并且系统控制返回到块A1,如图8中所示的。但是如果,在块I,没有条形码符号被解码,则系统控制器150确定是否已经达到最大扫描尝试阈值(即,允许进行多少次尝试解码),并且只要没有达到最大数,则系统控制器150保持在块K和G之间的控制循环,如图8中所指示的。当在块K处达到解码尝试的最大数,则可选地,系统控制器150发送解码失败的通知给操作者,并系统返回到块A1,如图8中所示的。
用于扫描不同类型1D和2D堆叠条形码符号的极其延长激光扫描光束的性能
示例性实施例的激光扫描条形码符号读取系统100的结构和操作已经在上文中描述。极其延长的激光扫描光束114B的新颖的延长比率(ER)特性已经在图7D中示出,并且其光束腰部特性已经在图7E中示出。当扫描不同类型的1D和2D堆叠条形码符号体系时,在该关键点(juncture)上描述极其延长的激光扫描光束114B的性能是合适的。
图9A示出了由从图3的激光扫描条形码符号读取器生成的极其延长激光扫描光束114B扫描的理想UPC条形码符号。图9B示出了由从图3的激光扫描条形码符号读取器所投射的极其延长(E2)激光扫描光束114B在用于扫描图9A中所示的理想UPC条形码符号116时所产生的反射率强度分布图。
图10A示出了由从图3的激光扫描条形码符号读取器所生成的极其延长激光扫描光束114B扫描的质量下降的UPC条形码符号。图10B示出了由从图3的激光扫描条形码符号读取器所投射的极其延长(E2)激光扫描光束114B在用于扫描图10A中所示的质量下降的UPC条形码符号116时所产生的反射率强度分布图。
图11A示出了由从图3的激光扫描条形码符号读取器所生成的极其延长激光扫描光束扫描的理想或优质堆叠2D条形码符号113的第二层。图11B示出了由从图3的激光扫描条形码符号读取器所投射的极其延长激光扫描光束在用于扫描图11A中所示的堆叠2D条形码符号时所产生的反射率强度分布图。
在上述每个条形码扫描示例中,延长比率大于4.5的极其延长激光光束114B的反射强度特性实质上大于延长比率小于4.5的传统延长激光光束10的反射强度特性。这种在反射强度特性上的改进,对使用这种极其延长激光扫描光束的条形码符号读取系统的信噪比(SNR)性能具有显著改善。如图13中所示,绘制了在扫描具有表面积为0.25[mm2]的参考缺陷的测试条形码符号时,延长比率小于4.5的传统延长激光光束和延长比率大于4.5的极其延长激光光束的SNR测量。明显地,由图3中的系统100生成的极其延长激光光束114B在图7中所示的激光扫描光束(即,Z轴)的工作距离上的所有位置处,相对于由图1中的系统1生成的常规生成的激光光束10具有显著改善的SNR。
但是,在具有与使用极其延长激光扫描光束相关联的SNR性能的这个改进情况下,转动性能的表现显著降低。当使用如图1所示的其中ER<4.5的传统延长激光光束10时,用户必须将激光光束对准到条形码符号元件15。以内。相反,当使用其中ER>4.5的极其延长激光光束分布图时,用户必须将激光光束对准到条形码符号元件5。以内,以保证激光扫描光束跨越整个条形码符号。因此,当使用极其延长激光光束分布图时,相比于常规激光扫描图案的转动角度,用户需要将激光扫描图案直观对准到更低的转动角度。
一些容易想到的修改
虽然示例性实施例公开了使用1D激光扫描光束来检测对象上的条形码符号,但是能够理解的是,使用极其延长激光光束的2D或光栅型的激光扫描光束(图案)也可以用来扫描1D条形码符号、2D堆叠线性条形码符号和2D矩阵码符号,并生成扫描数据信号用于解码处理。
另外,已经结合包括1-D和2-D条形码结构(例如1D条形码符号、2D堆叠线性条形码符号、和2D矩阵码符号)的各种类型码符号读取应用描述了示例性的实施例。在下文中,术语“码符号”应当认为是包括所有这样的码符号。
应当理解的是,对示例性实施例的基于数字成像的条形码符号读取系统可以以多种方式进行修改,本领域技术人员在得益于在此公开的新颖性教导后,其将变得显而易见。所有对其示例性实施例的这种修改和变形应当被认为在所附权利要求的范围之内。
Claims (9)
1.一种用于扫描低质量或损坏的条形码符号的使用极其延长的激光扫描光束的条形码符号读取系统,所述激光扫描系统具有工作范围,并包括:
外壳,具有光透射窗口;
极其延长的激光光束产生模块,用于产生极其延长的激光光束,具有i沿着z参考方向延伸的传播方向,ii由y参考方向表示的高度尺寸,以及iii由x参考方向表示的宽度尺寸,其中x、y、和z方向互相垂直;
其中所述极其延长的激光光束的特征在于延长比率ER,对于沿着所述z方向延伸的在所述激光扫描条形码符号读取系统的工作范围内的任何点,其定义为Y/X>4.5;
其中i Y表示所述极其延长的激光光束在所述Y参考方向上测量的光束高度,并且X表示所述极其延长的激光光束在所述X参考方向上测量的光束宽度,并且iii所述光束高度Y和所述激光光束宽度X在1/e2强度削波水平上被测量;以及
激光扫描机构,用于扫描来自所述光透射窗口以及跨越在外壳外部所定义的扫描域的所述极其延长的激光光束,在该扫描域中存在要由所述极其延长的激光扫描光束扫描的条形码符号。
2.根据权利要求1的条形码符号读取系统,其中所述延长比率在所述条形码符号读取系统的工作范围上沿着所述z参考方向大于4.5。
3.根据权利要求1的条形码符号读取系统,其中所述延长比率具有大于9.0的峰值,其发生在所述极其延长的激光扫描光束的腰部处。
4.根据权利要求1的条形码符号读取系统,其中所述极其延长的激光光束生成模块包括激光驱动电路,用于生成并递送驱动电流信号到激光源以生成所述极其延长的激光扫描光束。
5.根据权利要求1的条形码符号读取系统,其中所述激光源是可见激光二极管VLD。
6.根据权利要求1的条形码符号读取系统,其还包括:
集光光学器件,用于收集从在扫描域中被扫描的对象反射/散射的光,以及光电检测器,用于检测所收集的光的强度,并产生相应于在扫描操作期间的所检测的光强度的模拟扫描数据信号;
模拟扫描数据信号处理器/数字转换器,用于处理该模拟扫描数据信号,并将该已处理的模拟扫描数据信号转换为数字扫描数据信号,其之后被转换为数字字,其表示在该被扫描的条形码符号中条形和空白的相对宽度;
可编程的解码处理器,用于解码处理数字化数据信号,并生成符号字符数据,其表示由所述极其延长的激光扫描光束扫描的每个条形码符号。
7.根据权利要求1的条形码符号读取系统,其中所述激光扫描机构包括:
光反射表面和在支撑结构上支撑的永磁铁;并且
电磁线圈,设置在所述永久磁铁附近;
其中,当电流流过所述电磁线圈时,所述支撑结构旋转,并且所述光反射表面跨越所述扫描域扫描所述极其延长的激光光束。
8.根据权利要求1的条形码符号读取系统,其中所述外壳是可手持式外壳。
9.根据权利要求1的条形码符号读取系统,其中所述外壳是固定安装的外壳。
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