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US5304788A Laser diode scanner with enhanced visibility at an aiming distance relative to the reading distance 失效
激光二极管扫描仪在相对于读取距离的瞄准距离处具有增强的可见性

  • 专利标题： Laser diode scanner with enhanced visibility at an aiming distance relative to the reading distance
  • 专利标题（中）： 激光二极管扫描仪在相对于读取距离的瞄准距离处具有增强的可见性
  • 申请号： US865728
    申请日： 1992-04-09
  • 公开(公告)号： US5304788A
    公开(公告)日： 1994-04-19
  • 发明人: Boris Metlitsky , Jerome Swartz
  • 申请人： Boris Metlitsky , Jerome Swartz
  • 申请人地址： NY Bohemia
  • 专利权人： Symbol Technologies, Inc.
  • 当前专利权人： Symbol Technologies, Inc.
  • 当前专利权人地址： NY Bohemia
  • 主分类号： G06K7/10
  • IPC分类号： G06K7/10
Laser diode scanner with enhanced visibility at an aiming distance relative to the reading distance
摘要：
The visibility of a laser beam emitted by a laser diode in a scanner is enhanced to facilitate aiming the laser beam at a symbol to be read. An aperture stop in an optical train has an increased dimension along a non-scan direction. The magnification of a focusing lens in the optical train is increased. Laser diode astigmatism is affirmatively used to enhance visibility. What results is an aiming spot (or aiming scan line) at a farther plane (d6) that is more visible to the user than the scanning spot at a closer plane (d3), at which closer plane the scanner is able to read a bar code.
摘要（中）：

激光二极管在扫描仪中发射的激光束的可见度增强，以便于将激光束瞄准要读取的符号。 光学列车中的孔径光阑沿着非扫描方向具有增加的尺寸。 光学系列中的聚焦透镜的放大率增加。 激光二极管散光被肯定地用于提高可视性。 在距离更靠近的平面（d3）的扫描点更为可见的目标点（或瞄准扫描线）的结果是比扫描仪更靠近平面（d3），扫描仪能够读取条 码。

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