公开(公告)号：US4431912A

公开(公告)日：1984-02-14

申请号：US321036

申请日：1981-11-13

申请人： LeRoy D. Dickson ,  Charles M. Pierce ,  Olen L. Stokes ,  Norman J. Woodland

发明人： LeRoy D. Dickson ,  Charles M. Pierce ,  Olen L. Stokes ,  Norman J. Woodland

IPC分类号： G06K7/016 ,  G06K7/10

CPC分类号： G06K7/10871

摘要： An optical scanner in a retail store checkout stand includes a single item detector upstream of the scanner window. Output signals from the item detector and from symbol recognition logic are used to open and close a shutter in the beam path of the scanner laser. The shutter is opened and a first time out sequence is started when the beam path is interrupted. A second, short time out sequence is restarted each time a valid symbol is recognized. A third time out sequence of intermediate length supersedes the first time out sequence when the beam path is cleared. The laser shutter is closed and the symbol is transferred to a terminal or controller upon the completion of any active time out sequence or upon recognition of a predetermined number of identical symbols, whichever comes first.

摘要翻译： 零售店结帐台中的光学扫描器包括扫描器窗口上游的单个物品检测器。 来自物品检测器和符号识别逻辑的输出信号用于打开和关闭扫描仪激光器的光束路径中的快门。 打开快门，并且当光束路径中断时，开始第一次超时顺序。 每次识别有效符号时，重新启动第二个短时间延迟序列。 当光束路径被清除时，中间长度的第三次输出序列取代了第一个超时序列。 激光快门关闭，并且在完成任何活动超时序列之后或者在识别到预定数量的相同符号（以先到者为准）时，符号被传送到终端或控制器。

公开(公告)号：US4344152A

公开(公告)日：1982-08-10

申请号：US98461

申请日：1979-11-29

申请人： George J. Laurer ,  Charles M. Pierce

发明人： George J. Laurer ,  Charles M. Pierce

IPC分类号： G06K7/00 ,  G06F5/06 ,  G06F5/16 ,  G06K7/016 ,  G06K7/10 ,  G06F7/28

CPC分类号： G06K7/10851 ,  G06K7/0166

摘要： A scanning system includes a pair of buffer memories for alternately accumulating strings of signals which may contain bar coded label data. Candidate selection logic circuits examine incoming signals to generate a candidate signal when a string of signals satisfies gross logical tests. A control counter responds to the incoming signals and to the candidate signal to select an alternate buffer memory only when the active memory is fully loaded and contains at least part of a label candidate. The contents of the fully loaded memory are transferred to a processor for further analysis while incoming signals are routed to the alternate memory.

摘要翻译： 扫描系统包括一对缓冲存储器，用于交替地累积可以包含条形码标签数据的信号串。 当信号串满足总逻辑测试时，候选选择逻辑电路检查输入信号以产生候选信号。 控制计数器仅响应输入信号和候选信号才能在活动存储器完全加载并且至少包含标签候选的一部分时选择备用缓冲存储器。 满载存储器的内容被传送到处理器进行进一步分析，而输入信号被路由到备用存储器。