-
公开(公告)号：US5471043A
公开(公告)日：1995-11-28
申请号：US228514
申请日：1994-04-15
IPC分类号： G06K7/10
CPC分类号： G06K7/10851 , G06K7/10762
摘要： An optical assembly and electronic reader circuit cooperate to provide a highly-efficient and low-cost electro-optic barcode reader. The optical assembly includes a shielded housing, a photo detector and optical elements disposed about an un-folded optical path that provide a virtual reading window at one end of the housing whose field of view, which is focused to a point at the photo detector, is shaped to be no wider than constitutive barcode indicia. The electronic reader circuit includes a pulse amplifier and manual-adjustment-free average D.C. offset negative feedback and A.C. information peak detect negative feedback loops that respectively maintain the electrical pulse stream input to the pulse amplifier within the dynamic range thereof and eliminate electrical pulse stream peak noise. A circuit is coupled to a comparator with hysteresis square-up stage to deactivate the comparator in the state of no input signal.
摘要翻译： 光学组件和电子读取器电路协作提供高效率和低成本的电光条形码读取器。 光学组件包括屏蔽壳体，光电检测器和围绕未折叠光路布置的光学元件，该光学元件在壳体的一端处提供虚拟读取窗口，其视场聚焦到光电检测器处的点， 形状不比本构条形码标记宽。 电子读取器电路包括脉冲放大器和无手动调节的平均DC偏移负反馈和AC信息峰值检测负反馈回路，其分别保持在其动态范围内输入到脉冲放大器的电脉冲流，并消除电脉冲流峰值 噪声。 电路耦合到具有滞后平方的级比较器，以在无输入信号的状态下去激活比较器。
-
公开(公告)号：US5326963A
公开(公告)日：1994-07-05
申请号：US956726
申请日：1992-10-02
IPC分类号： G06K7/10
CPC分类号： G06K7/10851 , G06K7/10762
摘要： An optical assembly and electronic reader circuit cooperate to provide a highly-efficient and low-cost electro-optic barcode reader. The optical assembly includes a shielded housing, a photo detector and optical elements disposed about an un-folded optical path that provide a virtual reading window at one end of the housing whose field of view, which is focused to a point at the photo detector, is shaped to be no wider than constitutive barcode indicia. The electronic reader circuit includes a pulse amplifier and manual-adjustment-free average D.C. offset negative feedback and A.C. information peak detect negative feedback loops that respectively maintain the electrical pulse stream input to the pulse amplifier within the dynamic range thereof and eliminate electrical pulse stream peak noise. A circuit is coupled to a comparator with hysteresis square-up stage to deactivate the comparator in the state of no input signal.
摘要翻译： 光学组件和电子读取器电路协作提供高效率和低成本的电光条形码读取器。 光学组件包括屏蔽壳体，光电检测器和围绕未折叠光路布置的光学元件，该光学元件在壳体的一端处提供虚拟读取窗口，其视场聚焦到光电检测器处的点， 形状不比本构条形码标记宽。 电子读取器电路包括脉冲放大器和无手动调节的平均DC偏移负反馈和AC信息峰值检测负反馈回路，其分别保持在其动态范围内输入到脉冲放大器的电脉冲流，并消除电脉冲流峰值 噪声。 电路耦合到具有滞后平方的级比较器，以在无输入信号的状态下去激活比较器。
-
公开(公告)号：USD273112S
公开(公告)日：1984-03-20
申请号：US170103
申请日：1980-07-18
-
-
搜索结果
3 条记录 (耗时 0.048 秒)
