CN102737218A - 用于自动激光源选择的采用自动物体存在检测器的双激光扫描编码符号读取系统 - Google Patents

用于自动激光源选择的采用自动物体存在检测器的双激光扫描编码符号读取系统 Download PDF

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CN102737218A
CN102737218A CN2012101249120A CN201210124912A CN102737218A CN 102737218 A CN102737218 A CN 102737218A CN 2012101249120 A CN2012101249120 A CN 2012101249120A CN 201210124912 A CN201210124912 A CN 201210124912A CN 102737218 A CN102737218 A CN 102737218A
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W·H·黑文斯
S·科拉维托
C·艾伦
R·布莱克
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Abstract

用于读取编码符号的方法和系统，双激光扫描条形码符号读取系统具有通过使用在激光扫描场的近场部分中的自动物体存在检测子系统，来以用户透明的方式自动选择和激活激光照明的近场光源或激光照明的远场光源的能力。

Description

用于自动激光源选择的采用自动物体存在检测器的双激光扫描编码符号读取系统
技术领域
本公开涉及一种改进的方法和装置，其用于根据物体是出现在系统的激光扫描场中的近部分还是远部分内，来选择双激光扫描编码符号读取系统中的正确的激光源。
背景技术
美国专利No.5,420,411和5,945,658公开了具有扫描编码符号的能力的双激光扫描编码符号读取系统，扫描编码符号使用了(i)聚焦在激光扫描场近部分上的第一激光源，或(ii)聚焦在激光扫描场远部分上的第二激光源。
通常，现有技术的双激光扫描系统采用多个算法，用于根据在任意时间瞬间目标物体位于激光扫描场内的何处，来在近场和远场激光源二者之一中进行选择。
但是，这种传统的激光源选择方法实现起来会是昂贵的，会导致错误的性能，并且会对双激光扫描系统增加不必要的复杂度。
现有技术中对于每当物体在这种激光扫描系统的激光扫描场的近部分或远部分内出现时，提供一种在双激光扫描编码符号读取系统中选择正确的激光源的改进方法有很大的需求。
发明内容
本公开的主要目的是提供一种改进的方法和装置，其用于当物体出现在双激光扫描编码符号读取系统的激光扫描场的近部分或远部分内时，选择正确聚焦的激光源。
另一个目的是提供一种系统，其用于使用双激光扫描条形码符号读取系统来读取编码符号，该双激光扫描条形码符号读取系统具有通过使用在激光扫描场的近部分中的自动物体存在检测子系统，来以用户透明的方式自动选择和激活激光照明的近场光源或激光照明的远场光源的能力。
另一个目的是提供一种手持式双激光扫描编码符号读取系统，该系统采用IR存在传感器，该传感器对出现在双激光扫描编码符号读取系统的激光扫描场的近部分中的光反射物体的存在进行自动响应。
另一个目的是提供一种采用IR存在传感器的固定安装的双激光扫描系统，该传感器对出现在双激光扫描系统的激光扫描场的近部分中的光反射物体的存在进行自动响应。
本公开的另一个目的是提供一种双激光扫描编码符号读取系统，其采用安装于其光传输窗口前部的IR存在检测模块，使得IR光线发射机和IR光接收机具有在系统的激光扫描场中的物体的不受阻碍的视野。
本发明的另一个目的是提供一种在大深度的场上自动读取条形码的改进方法，该自动读取使用采用了IR物体存在检测器的双激光扫描系统，该检测器用于检测物体是位于系统的近场区域还是远场区域内。
本发明的另一个目的是提供一种采用IR物体存在检测器的双激光扫描编码符号读取系统，该检测器能发射具有连续低强度输出电平，或具有脉冲的更高强度的输出电平的IR信号，以增加系统的物体检测范围。
在下文和此处所附的权利要求中，本公开进一步的目的将变得更加清楚。
附图说明
为了更完整地理解这些目的，应当结合附图阅读下面的说明性实施例的详细描述，其中：
图1是人工触发的手持式双激光扫描条形码符号读取系统的说明性实施例的透视图，该系统具有通过使用在激光扫描场的近场部分中的自动物体存在检测子系统，来自动选择和激活激光照明的近场光源或激光照明的远场光源的能力；
图2是描述了图1中说明的人工触发的双激光扫描条形码符号读取系统的主要系统组件的示意框图；
图3A和3B，一起阐述了描述了在图1的人工触发的双激光扫描条形码符号读取系统中执行的主要步骤的流程图，其中根据物体是位于激光扫描场的近场部分还是远场部分中，在激光扫描操作期间自动选择和激活激光照明的近场光源或激光照明的远场光源；
图4是自动触发的手持式双激光扫描条形码符号读取系统的说明性实施例的透视图，该系统具有通过使用在激光扫描场的近场部分和远场部分内部署的自动物体存在检测子系统，来自动选择和激活激光照明的近场光源或激光照明的远场光源的能力；
图5是描述了图1中说明的自动触发的双激光扫描条形码符号读取系统的主要系统组件的示意框图；以及
图6A和6B一起阐述了描述了在图1的自动触发的双激光扫描条形码符号读取系统中执行的主要步骤的流程图，其中根据物体是位于激光扫描场的近部分还是远部分中，在激光扫描操作期间自动选择和激活激光照明的近场光源或激光照明的远场光源。
具体实施方式
参考附图中的图，将非常详细地描述双激光扫描条形码符号读取系统的说明性实施例，其中将使用相同的参考数字指示相同的元件。
人工触发的手持式双激光扫描条形码符号读取系统
现在参考图1到图3B，将详细描述人工触发的手持式双激光扫描条形码符号读取系统1的第一说明性实施例。
如图1和2中所示的，人工触发的激光扫描条形码符号读取器100包括：具有头部部分和支撑头部部分的把手部分的手持式外壳102；与外壳102的头部部分相结合的光传输窗口103；与外壳的把手部分相结合的人工致动的触发器开关104，用于激活其具有激光扫描场115的激光扫描模块105；基于IR的近场物体检测子系统219，其在激光扫描场的近部分内生成IR光束，如图2中所示，用于自动检测在激光扫描场近部分中物体的存在，并当在激光扫描场的近部分中自动检测到物体时触发系统；激光扫描模块105，用于使以下光束重复扫描越过激光扫描场：(i)由近场激光源112A(例如VLD或IRLD)所生成的可见激光束，该近场激光源具有光学器件，用于当模块105在其近场激光照明操作模式下操作时响应于由系统控制器150所生成的第一控制信号而产生在激光扫描场的近部分中聚焦的激光扫描光束，或者(ii)由远场激光源112B(例如VLD或IRLD)所生成的可见激光束，该远场激光源具有光学器件，用于当模块105在其远场激光照明操作模式下操作时，响应于由系统控制器150所生成的第二控制信号而产生在激光扫描场的远部分中聚焦的激光扫描光束，其中操作模式取决于在执行操作方法时由系统控制器150所执行的实时分析的结果，图3中指定的；其中激光扫描模块105还包括激光驱动电路151，用于接收来自系统控制器150的第一和第二控制信号，并对其响应，生成第一和第二激光(二极管)驱动电流信号并将它们分别传送到近场激光源112A和远场激光二极管光源112B，以在图3中描述的条形码读取方法期间选择性地产生近场和远场激光扫描光束；光收集光学器件106，用于收集从扫描场中的所扫描物体反射/散射的光，以及光电检测器，用于检测收集的光强度并生成与在扫描操作期间的该检测的光强度相对应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，该数字扫描数据信号然后被转换为表示在扫描的编码符号结构中的条形和空白的相对宽度的数字字；编程的解码处理器108，用于解码处理数字化数据信号，并生成表示由可见或不可见的激光扫描束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通过由符号读取器和主机系统支持的有线或无线通信链路对其发送符号字符数据；以及系统控制器150，用于生成必要的控制信号，该控制信号用于控制手持式激光扫描条形码符号读取系统内的操作。
优选地，基于IR的物体检测子系统219被安装在其光传输窗口103之前使得子系统219的IR光发射机和IR光接收机组件具有在系统的激光扫描场内的物体的不受阻碍的视野，如图1中所示。而且，IR物体存在检测模块219能够将具有连续的低强度输出电平或具有脉冲的更高强度的输出电平的IR信号传送到扫描场115中，该IR信号可在一些条件下使用以增加系统的物体检测范围。在可选的实施例中，IR光发射机和IR光接收机组件可以被分别实现为可见光(例如，红光)发射机和可见光(例如，红光)接收机组件，在本领域中是公知的。典型地，物体检测光束将被调制并被同步检测，如美国专利No.5,340,971中所教导的，该专利通过引用结合于此。
如图2中所示，激光扫描模块105包括多个子组件，即：激光扫描部件110，其具有电磁线圈128和支持轻型反射元件(例如，反射镜)134A的可旋转扫描元件(例如，反射镜)134；线圈驱动电路111，用于生成电驱动信号以驱动激光扫描部件110中的电磁线圈128；以及近场激光束光源112A，用于产生近场可见激光束113A，以及远场激光束光源112B，用于产生远场可见激光束113B；以及光束偏转反射镜114，用于偏转激光束113A或113B(取决于在任何时间瞬间哪个激光源被系统控制器150所使能)以作为朝向激光扫描部件110的反射镜组件的入射光束114A，扫描部件110使偏转激光束114B扫过在系统操作期间可能同时出现于其中的激光扫描场和条形码16。
如图2中所示，激光扫描模块105典型地安装于光具座、印刷电路(PC)板或其他表面上，激光扫描部件同样安装于该处，并且激光扫描模块105包括线圈支撑部分110，用于支撑电磁线圈128(在永磁体135附近)并且该电磁线圈128由驱动电路111所驱动，使得在扫描部件操作期间，电磁线圈128在永磁体135的相对极上生成磁力。
通常，系统100支持人工触发的触发操作模式，以及下面描述的条形码读取方法。
响应于触发事件(即，人工地拉动触发器104)，激光扫描模块105生成扫描光束并通过光传输窗口103投射激光扫描光束，并越过手持式外壳外部的激光扫描场，以便对扫描场中的物体进行扫描。响应于由系统控制器150所生成的控制信号，激光扫描光束由近场激光束源112A或远场激光束源112B所生成。扫描元件(即，机构)134使选择的激光束重复扫描越过驻留在激光扫描场115的近部分或远部分中的物体上的编码符号。然后，光收集光学器件106收集从扫描场中的物体上的扫描的编码符号反射/散射的光，以及光电检测器(106)自动检测收集的光的强度(即，光子能量)，并生成与在扫描操作期间所检测的光强度相对应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处理模拟扫描数据信号，并将处理的模拟扫描数据信号转换为数字化数据信号。编程的解码处理器108解码处理数字化的数据信号，并生成表示由近场或远场激光扫描光束所扫描的每个条形码符号的符号字符数据。与由解码器108所读取的条形码相对应的符号字符数据接着通过I/O通信接口140发送到主机系统，该I/O通信接口可支持有线和/或无线的通信链路，在本领域中是公知的。在物体检测和激光扫描操作期间，系统控制器150生成必要的控制信号以用于控制手持式激光扫描条形码符号读取系统内的操作。
参考图3A和3B，将更加详细地描述用于读取条形码符号和控制激光扫描条形码读取器100内的操作的方法。
如图3A中所指示的，由系统控制器150所编排的过程在“开始”框处开始。然后在图3A中的A1框处，系统控制器确定触发事件是否已经发生(即，在看到物体处于激光扫描场中并将外壳的头部部分指向物体时，触发器104是否已经被操作者人工按压)。如果在A1框处触发器事件已经被检测到，则在A2框处激活系统并且系统控制器确定IR物体存在检测子系统219是否在激光扫描场115的近部分中检测到物体。如果IR物体存在检测子系统219在扫描场115的近部分中检测到物体，则在B框处，系统控制器150命令激光扫描模块105用由近场VLD 112A所生成的激光束扫描检测到的物体。
在C框处，解码处理器108对捕获的扫描数据运行解码算法，以及如果在D框处，解码了条形码符号，则在E框处，将产生的符号字符数据发送到主机系统，并且系统控制器返回到A1框处。然而，如果在D框处，没有解码条形码符号，则在F1框处系统控制器150确定是否已经达到了最大扫描尝试阈值，如果没有，则系统控制器150返回到B框，并如所指示的重新开始流程。然而，如果在F1框处，系统控制器150确定已经达到最大扫描尝试阈值，则系统控制器150进行到F2框并发送解码失败的通知给操作者，并返回到A1框。
如果在A2框处，在激光扫描场的近部分中没有检测到物体，则在图3B的G框处，系统控制器命令激光扫描模块105用由远场VLD 112B所生成的激光束扫描检测的物体。然后在H框处，对收集的扫描数据运行一个或多个解码算法，以及在I框处，系统控制器150确定解码处理器108是否解码了条形码符号。如果在I框处，解码了条形码符号，则在J框处，将产生的符号字符数据发送到主机系统，并且系统控制返回到A1框，如图3中所示。然而，如果在I框处，没有解码条形码符号，则系统控制器150确定是否已经达到最大扫描尝试阈值(即，允许尝试多少次解码)，并且只要尚没有达到最大数量，系统控制器150就维持K框和G框之间的控制循环，如图3B中所指示的。当在K框处已经达到尝试解码的最大数量时，则系统控制器150可选择地发送解码失败的通知给操作者，并且系统返回到A1框，如图3A中所示。
读取条形码符号和控制系统操作的上述方法在激光扫描条形码符号读取器100内以自动的方式执行，对操作者完全透明，该操作者将系统握在他或她的手中。借助于这种独特的控制方法，系统能够以用户透明的方式，使用在激光扫描数据捕获和处理操作期间切换的激光源，来读取激光扫描场的近部分和远部分两者中的条形码符号，而没有现有技术和工艺所呈现的复杂度。
自动触发的手持式双激光扫描系统
参考图4到图6B，将详细描述自动触发的手持式双激光扫描条形码符号读取系统500的第二说明性实施例。
现在参考图4到图6，将详细描述自动触发的手持式双激光扫描条形码符号读取系统1的第二说明性实施例。
如图4和5中所示，人工触发的激光扫描条形码符号读取器500包括：手持式外壳102，具有头部部分和支撑头部部分的把手部分；与外壳102的头部部分相结合的光传输窗口103；置于外壳的头部部分内的基于IR的近场/远场物体检测子系统225，用于在激光扫描场的近场和远场部分内生成IR光束，如图5中所示，以便自动检测物体是否出现在激光扫描场的近场或远场部分，如果是这样，则自动激活(即，触发)包括激光扫描模块105的系统以执行激光扫描数据捕获和处理操作；激光扫描模块105，用于使以下光束重复扫描越过激光扫描场：(i)由近场激光源112A(例如VLD或IRLD)生成的可见激光束，该近场激光源具有光学器件，用于当模块105在其近场激光照明操作模式下操作时，响应于由系统控制器150所生成的第一控制信号而产生在激光扫描场的近部分中聚焦的激光扫描光束，或者(ii)由远场激光源112B(例如VLD或IRLD)生成的可见激光束，该远场激光源具有光学器件，用于当模块在其远场激光照明操作模式下操作时，响应于系统控制器150生成的第二控制信号而产生在激光扫描场的远部分中聚焦的激光扫描光束，其中操作模式取决于在执行操作方法时由系统控制器150所执行的实时分析的结果，图6中指定的；其中激光扫描模块105还包括激光驱动电路151，用于接收来自系统控制器150的第一和第二控制信号，并对其响应，生成第一和第二激光(二极管)驱动电流信号并将它们分别传送到近场激光源112A和远场激光二极管光源112B，以在图6中描述的条形码符号读取方法期间选择性地产生近场和远场激光扫描光束；光收集光学器件106，用于收集从扫描场中的所扫描物体反射/散射的光，以及光电检测器，用于检测收集的光的强度并生成与扫描操作期间的该检测的光强度相对应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，数字扫描数据信号然后被转换为表示扫描的编码符号结构中的条形和空白的相对宽度的数字字；编程的解码处理器108，用于解码处理数字化数据信号，并生成表示由可见或不可见的激光扫描束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通过由符号读取器和主机系统所支持的有线或无线通信链路对其发送符号字符数据；以及系统控制器150，用于生成必要的控制信号，该控制信号用于控制手持式激光扫描条形码符号读取系统内的操作。
优选地，基于IR的物体检测子系统225安装在其光传输窗口之前使得子系统225的IR光发射机和IR光接收机组件具有在系统的激光扫描场内的物体的不受阻碍的视野。而且，IR物体存在检测模块225能够发射具有连续的低强度输出电平或具有脉冲的更高强度的输出电平的IR信号，该IR信号可在一些条件下使用以增加系统的物体检测范围。在可选的实施例中，IR光发射机和IR光接收机组件可以被分别实现为可见光(例如，红光)发射机和可见光(例如，红光)接收机组件，在本领域中是公知的。典型地，物体检测光束将被调制并被同步检测，如在美国专利5,340,971中所教导的，该专利通过引用结合于此。
如图5中所示，激光扫描模块105包括多个子组件，即：具有电磁线圈128和支持轻型反射元件的可旋转的或摆动的扫描元件134的激光扫描部件110；线圈驱动电路111，用于生成电驱动信号以驱动激光扫描部件110中的电磁线圈128；以及近场激光束光源112A，用于产生近场可见激光束113A，以及远场激光束光源112B，用于产生远场可见激光束113B；以及光束偏转反射镜114，用于从激光束光源112A或112B(取决于在任意时间瞬间哪个光源被系统控制器150使能)朝向激光扫描部件110的反射镜组件134A来偏转激光束113A或113B，该激光扫描部件110使激光束114B扫过其扫描场和一个或多个条形码符号16，该扫描场和条形码符号在系统操作期间可能同时出现于这种激光扫描场115中。
如图5中所示，激光扫描模块105典型地安装于光具座、印刷电路(PC)板或其他表面上，激光扫描部件也安装在该处，并且激光扫描模块105包括线圈支撑部分110，用于支撑电磁线圈128(在永磁体135附近)并且电磁线圈128由驱动电路111驱动，使得在扫描部件操作期间，电磁线圈128在永磁体135的相对极上生成磁力，引起反射镜组件134在其旋转轴附近摆动。
通常，系统500支持自动触发的操作模式，以及下面描述的条形码符号读取方法。
响应于由基于IR的物体存在检测子系统225对激光扫描场115中物体的自动检测，激光扫描模块105生成扫描光束并通过光传输窗口103投射激光扫描光束，并越过手持式外壳外部的激光扫描场115，以便对扫描场中的物体进行扫描。响应于由系统控制器150生成的控制信号，激光扫描光束由近场激光源112A或远场激光源112B所生成。根据系统操作期间激光扫描场中物体的位置，扫描元件(即，机构)134使近场激光束或远场激光束重复扫描。然后，光收集光学器件106收集从扫描场中物体上的扫描的编码符号反射/散射的光，并且光电检测器(106)自动检测收集的光的强度(即，光子能量)，并生成与在扫描操作期间检测到的光强度相对应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处理模拟扫描数据信号，并将处理的模拟扫描数据信号转换为数字化数据信号。编程的解码处理器108解码处理数字化数据信号，并生成表示由可见或不可见激光扫描光束所扫描的每个条形码符号的符号字符数据。与由解码器108所读取的可见和/或不可见条形码相对应的符号字符数据接着通过I/O通信接口140被发送到主机系统，该I/O通信接口140可支持有线和/或无线的通信链路接，在本领域中是公知的。在物体检测和激光扫描操作期间，系统控制器150生成必要的控制信号以用于控制手持式激光扫描条形码读取系统500内的操作。
参考图6A和6B，将在以下更加详细描述读取条形码符号和控制激光扫描条形码读取器500内的操作的方法。
如图6A中所指示的，由系统控制器150所编排的过程在“开始”框处开始，在该处激活了所有系统组件。如在图6A的A1框处所指示的，系统控制器继续确定何时在视场(FOV)中的任何地方已经检测到物体，以及该事件何时发生，在A2框处，系统控制器确定基于IR的物体存在检测子系统225是否在扫描场115的近部分中检测到物体。如果在扫描场的近部分中已经检测到物体，则在B框处，系统控制器150命令激光扫描模块105用由近场VLD112A所生成的激光束扫描检测到的物体。
在C框处，解码处理器108对捕获的扫描数据运行解码算法，以及如果在D框处，解码了条形码符号，则在E框处，将产生的符号字符数据发送到主机系统，并且系统控制器返回到A1框。然而，如果在D框处，没有解码条形码符号，则在F1框处系统控制器150确定是否已经达到了最大扫描尝试阈值，以及如果没有，则系统控制器150返回到B框，并重新开始如所指示的流程。然而，如果在F1框处，系统控制器150确定已经达到最大扫描尝试阈值，则可选地，系统控制器150进行到F2框并发送解码失败的通知给操作者，并返回到A1框。
如果在A2框处，在激光扫描场的近部分中没有检测到物体，则在图6B的G框处，系统控制器命令激光扫描模块105用由远场VLD112B所生成的激光束扫描检测的物体。然后在H框处，对收集到的扫描数据运行一个或多个解码算法，以及在I框处，系统控制器150确定解码处理器108是否解码了条形码符号。如果在I框处，解码了条形码符号，则在J框处，将产生的符号字符数据发送到主机系统，并且系统控制回到A1框，如图6A中所示。然而，如果在I框处，没有解码条形码符号，则系统控制器150确定是否已经达到最大扫描尝试阈值(即，允许尝试多少次解码)，并且只要尚没有达到最大数量，系统控制器150就维持K框和G框之间的控制循环，如图6B中所指示的。当在K框处已经达到尝试解码的最大数量时，则系统控制器150可选择地发送解码失败的通知给操作者，并且系统返回到A1框，如图6A中所示。
读取条形码符号和控制系统操作的上述方法在激光扫描条形码符号读取器500内以自动的方式执行，对操作者完全透明，该操作者可将系统握在他或她的手中，或者系统在工作台面的表面上的架子中被支撑。借助于这种独特的控制方法，系统能够以用户透明的方式，使用在激光扫描数据捕获和处理操作期间切换的激光源来读取激光扫描场的近部分和远部分两者中的条形码符号，而没有现有技术和工艺中呈现的复杂度。
容易想到的一些修改
虽然说明性实施例公开了使用1D激光扫描模块来检测扫描物体上的可见和/或不可见的条形码符号，但是要理解的是，也可以使用2D或光栅类型的激光扫描模块，来扫描1D条形码符号、2D堆叠式线性条形码符号、和2D矩阵编码符号，并生成用于解码处理的扫描数据信号。
虽然已经说明了手持式双激光扫描系统，但是要理解的是，可将这些双激光扫描系统封装在模块化的紧凑外壳中，并安装在固定应用环境中，例如在工作台面的表面上、在墙表面上、以及在例如铲车的可运输机器上，在这些地方需要扫描物体(例如，箱子)上的编码符号，该物体可能位于大扫描范围(例如，距离扫描系统达20多英尺)内的任意地方。在这种固定安装的应用中，触发信号可由位于远程位置(例如，在驾驶员附近的铲车驾驶室内)或没有位于系统的外壳上的任何地方的手动开关来产生。
同样地，已经结合各种类型的编码符号读取应用描述了说明性实施例，该编码符号读取应用涉及1-D和2-D条形码结构(例如，1D条形码符号、2D堆叠式线性条形码符号、和2D矩阵编码符号)，要理解的是，本发明可被用于读取(即，识别)任何机器可读标记、数据表单、或图形编码形式的情报，包括但不限于，条形码符号结构、字母数字字符识别字符串、笔迹、和在现有技术中已知的或在未来开发的各种的数据形式。在下文中，术语“编码符号”应当被认为包括携带结构和其它形式的图形编码情报的所有这种信息。
要理解的是，说明性实施例的基于数字成像的条形码符号读取系统可以以对于受益于在此公开的新颖教导的本领域技术人员将是容易理解的多种方式来进行修改。其中的说明性实施例的所有这些修改和变形都应视为处于此处所附的权利要求的范围之内。

Claims (13)

1.一种用于读取编码符号的激光扫描编码符号读取系统，包括：
外壳，具有光传输窗口；
激光扫描模块，置于所述外壳中，用于使激光束扫描越过激光扫描场，该激光扫描场具有在所述光传输窗口外部限定的近部分和远部分，
其中所述激光扫描模块响应于由系统控制器生成的一个或多个控制信号，并包括
(i)激光驱动模块，用于响应于接收来自所述系统控制器的所述一个或多个控制信号，驱动近场激光源以产生在所述激光扫描场的近部分内聚焦的近场激光束，并用于响应于接收来自所述系统控制器的所述一个或多个控制信号，驱动远场激光源以产生远场激光束，以及
(ii)激光扫描机构，用于使所述近场激光束扫描越过所述激光扫描场和所述激光扫描场中的物体上的编码符号，或使所述远场激光束扫描越过所述激光扫描场和所述激光扫描场中的物体上的编码符号；
自动物体检测器，置于所述外壳中，用于自动检测所述物体何时出现在所述激光扫描场的近部分中，并对其响应以生成物体检测事件；
光收集光学器件，置于所述外壳中，用于收集从所述激光扫描场中的所扫描物体反射/散射的光；
光电检测器，置于所述外壳中，用于检测从所述编码符号收集的光的强度，并生成与在激光扫描操作期间的所述检测的光强度相对应的模拟扫描数据信号；
模拟扫描数据信号处理器，置于所述外壳中，用于处理所述模拟扫描数据信号，并将处理的模拟扫描数据信号转换为数字化数据信号；
编程的解码处理器，置于所述外壳中，用于解码处理所述数字化数据信号，并生成表示由所述近场或远场激光束所扫描的每个编码符号的符号字符数据；以及
输入/输出(I/O)通信接口，置于所述外壳中，用于通过由所述激光扫描编码符号读取系统和主机系统所支持的通信链路，与所述主机系统对接并将符号字符数据发送到所述主机系统；
所述系统控制器，响应于所述物体检测事件的生成，用于控制所述激光扫描条形码读取系统内的操作；以及
其中，当所述系统控制器检测所述物体检测事件的生成时，所述系统控制器生成所述一个或多个控制信号，该一个或多个控制信号引起所述近场激光源生成所述近场激光束，并且在激光扫描操作期间，所述激光扫描机构使所述近场激光束扫描越过所述激光扫描场中的物体上的编码符号，以便生成模拟扫描数据信号，该模拟扫描数据信号被处理并被转换为数字化数据信号，该数字化数据信号然后被解码处理以致力于读取所述物体上的所述编码符号。
2.权利要求1的激光扫描编码符号读取系统，其中，如果在预定数量的扫描和解码处理尝试之后没有读取所述编码符号，则所述系统控制器生成所述一个或多个控制信号，该一个或多个控制信号引起所述远场激光源生成所述远场激光束，并且在激光扫描操作期间，所述激光扫描机构使所述远场激光束扫描越过位于所述激光扫描场中的物体上的编码符号，以便生成模拟扫描数据信号，该模拟扫描数据信号被处理并被转换为数字化数据信号，该数字化数据信号然后被解码处理以致力于读取所述物体上的所述编码符号。
3.权利要求2的激光扫描编码符号读取系统，其中，如果在预定数量的扫描和解码处理尝试之后没有读取所述编码符号，则所述系统控制器返回到检测或重新检测所述激光扫描场中的物体。
4.权利要求1的激光扫描编码符号读取系统，其中，如果所述物体检测事件没有被所述自动物体检测器所生成和被所述系统控制器所检测，则所述系统控制器生成所述一个或多个控制信号，该一个或多个控制信号引起所述远场激光源生成所述远场激光束，并且在激光扫描操作期间，所述激光扫描机构使所述远场激光束扫描越过在所述激光扫描场中的物体上的编码符号，以便生成模拟扫描数据信号，该模拟扫描数据信号被处理并被转换为数字化数据信号，该数字化数据信号然后被解码处理以致力于读取所述物体上的所述编码符号。
5.权利要求1的激光扫描编码符号读取系统，其中，所述物体检测事件通过按压触发开关来人工生成或通过自动物体检测器检测所述激光扫描场内的物体来自动生成。
6.一种双激光扫描条形码符号读取系统，包括：
外壳，具有光传输窗口，以及在所述光传输窗口外部限定的激光扫描场；
激光照明的近场激光源，用于扫描在所述激光扫描场的近部分中的物体；
激光照明的远场激光源，用于扫描在所述激光扫描场的远部分中的物体；
自动物体存在检测子系统，用于自动检测所述激光扫描场的近部分中的所述物体，并对其响应以生成物体检测事件；以及
系统控制器，响应于所述自动物体存在检测子系统，用于当响应于在所述激光扫描场的所述近部分中物体的自动检测而生成所述物体检测事件时，自动选择和激活所述近场激光源；以及
其中，如果所述物体检测事件没有被所述自动物体检测器所生成和被所述系统控制器所检测，则所述系统控制器生成所述一个或多个控制信号，该一个或多个控制信号引起所述远场激光源生成所述远场激光束，并且在激光扫描操作期间，所述激光扫描机构使所述远场激光束扫描越过在所述激光扫描场中的物体上的编码符号，以便生成模拟扫描数据信号，该模拟扫描数据信号被处理并被转换为数字化数据信号，该数字化数据信号然后被解码处理以致力于读取所述物体上的所述编码符号。
7.一种读取编码符号的方法，包括下列步骤：
(a)使激光扫描编码符号读取系统靠近具有一个或多个编码符号的物体，其中所述激光扫描编码符号读取系统包括
(i)外壳，具有光传输窗口；
(ii)激光扫描模块，置于所述外壳中，用于使激光束扫描越过激光扫描场，该激光扫描场具有在所述光传输窗口外部限定的近部分和远部分，其中所述激光扫描模块响应于由系统控制器生成的一个或多个控制信号，并包括
(iii)激光驱动模块，用于响应于接收来自所述系统控制器的所述一个或多个控制信号，驱动近场激光源以产生在所述激光扫描场的近部分内聚焦的近场激光束，或用于响应于接收来自所述系统控制器的所述一个或多个控制信号，驱动远场激光源以产生远场激光束，以及
(iv)激光扫描机构，用于使所述近场激光束扫描越过所述激光扫描场和所述激光扫描场中的物体上的编码符号，或使所述远场激光束扫描越过所述激光扫描场和所述激光扫描场中的物体上的编码符号；
(v)自动物体检测器，置于所述外壳中，用于自动检测所述物体何时出现在所述激光扫描场的近部分中，并对其响应以生成物体检测事件；
(vi)光收集光学器件，用于收集从所述激光扫描场中的所扫描物体反射/散射的光，以及光电检测器，用于检测收集的光的强度，并生成与激光扫描操作期间的检测的光强度相对应的模拟扫描数据信号；
(iii)模拟扫描数据信号处理器，置于所述外壳中，用于处理所述模拟扫描数据信号，并将处理的模拟扫描数据信号转换为数字化数据信号；
(iv)编程的解码处理器，置于所述外壳中，用于解码处理所述数字化数据信号，并生成表示由所述近场激光束和所述远场激光束扫描的每个编码符号的符号字符数据；以及
(v)I/O通信接口，用于将符号字符数据发送到所述主机系统；
(b)检测所述激光扫描场的近部分中的物体并生成物体检测事件；
(c)响应于所述物体检测事件的生成，所述近场可见激光源生成所述近场激光束，所述激光扫描机构使所述近场激光束重复扫描越过所述激光扫描场的近部分中的物体上的任意编码符号，所述光收集光学器件收集从所述激光扫描场中的所述扫描的可见编码符号反射/散射的光，所述光电检测器自动检测收集的光的强度并生成与在扫描操作期间所检测的光强度相对应的模拟扫描数据信号，所述模拟扫描数据信号处理器处理所述模拟扫描数据信号并将处理的模拟扫描数据信号转换为第一数字化数据信号；
(d)所述解码处理器处理所述第一数字化数据信号以致力于读取在步骤(c)期间扫描的编码符号；以及
(e)如果所述解码处理器在步骤(d)期间读取所述编码符号，则所述解码处理器产生表示所述编码符号的符号字符数据，以及所述I/O通信接口将所述符号字符数据发送到主机系统。
8.权利要求7的方法，其中，如果在步骤(b)期间没有检测到物体并且没有生成物体检测事件，则自动生成一个或多个控制信号，该一个或多个控制信号引起所述远场激光源生成所述远场激光束，并且在激光扫描操作期间，所述激光扫描机构使所述远场激光束扫描越过在所述激光扫描场中的物体上的编码符号，以便生成模拟扫描数据信号，该模拟扫描数据信号被处理并被转换为数字化数据信号，该数字化数据信号然后被解码处理以致力于读取所述物体上的所述编码符号。
9.权利要求7的方法，其进一步包括：
(f)如果在如此进行的一次或多次尝试之后，所述解码处理器不能在步骤(d)期间读取编码符号，则所述远场激光源生成所述远场激光束，所述激光扫描机构使所述远场激光束重复扫描越过所述激光扫描场中的物体上的任意编码符号，所述光收集光学器件收集从所述激光扫描场中的所述扫描的编码符号反射/散射的光，所述光电检测器自动检测收集的光的强度并生成与在扫描操作期间所检测的光强度相对应的模拟扫描数据信号，所述模拟扫描数据信号处理器处理所述模拟扫描数据信号并将处理的模拟扫描数据信号转换为第二数字化数据信号；
(g)所述解码处理器处理所述第二数字化数据信号以致力于读取在步骤(f)期间扫描的编码符号；以及
(h)如果所述解码处理器在步骤(g)期间读取编码符号，则所述解码处理器产生表示所述编码符号的符号字符数据，并且所述I/O子系统将所述符号字符数据发送到主机系统。
10.权利要求9的方法，其进一步包括：
(i)如果在如此进行的一次或多次尝试之后，所述解码处理器不能在步骤(g)期间读取编码符号，则所述系统控制器将控制返回到步骤(b)并重新开始物体检测操作。
11.权利要求7的方法，其中步骤(b)包括：所述物体检测事件通过人工按压触发开关来生成，或通过自动物体检测器检测所述激光扫描场内的物体来自动生成。
12.权利要求7的方法，其中，如果在预定数量的扫描和解码处理尝试之后没有读取所述编码符号，则所述系统控制器生成所述一个或多个控制信号，该一个或多个控制信号引起所述远场激光源生成所述远场激光束，并且在激光扫描操作期间，所述激光扫描机构使所述远场激光束扫描越过位于所述激光扫描场中的物体上的编码符号，以便生成模拟扫描数据信号，该模拟扫描数据信号被处理并被转换为数字化数据信号，该数字化数据信号然后被解码处理以致力于读取所述物体上的所述编码符号。
13.权利要求7的方法，其中，如果在预定数量的扫描和解码处理尝试之后没有读取所述编码符号，则所述系统控制器返回到检测或重新检测所述激光扫描场的近部分中的物体。
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