Illumination apparatus with polarizing elements for beam shaping
    3.
    发明授权
    Illumination apparatus with polarizing elements for beam shaping 有权
    具有用于光束成形的偏振元件的照明装置

    公开(公告)号:US07209289B2

    公开(公告)日:2007-04-24

    申请号:US11237315

    申请日:2005-09-27

    Abstract: Illumination apparatus for forming an output beam, the apparatus comprising: (a) a light source adapted to emit a source beam of linearly-polarized light in a downstream direction along an optical axis, said source beam having a polarization direction transverse to said optical axis; and (b) a fixed birefringent plate having first and second regions with different rotational properties such that said first region of said plate intercepts a first portion of said source beam and said second region intercepts a second portion of said source beam, said first and second regions altering the polarization of said first and second portions of said source beam by different amounts so as to form an altered beam having a central portion with a first polarization direction and a peripheral portion with a second polarization direction transverse to said first polarization direction, said peripheral portion surrounding said central portion, said central portion having a first intensity distribution relative to said optical axis, said peripheral portion having a second intensity distribution relative to said optical axis; and (c) at least one polarization-selective element mounted downstream from said birefringent plate, said at least one polarization-selective element having a transmission axis and being operative to allow transmission of light having a polarization direction parallel to such transmission axis and to prevent transmission of light having a polarization direction perpendicular to such transmission axis.

    Abstract translation: 用于形成输出光束的照明装置,所述装置包括:(a)光源,其适于在沿着光轴的下游方向发射线偏振光源光束,所述源光束具有横向于所述光轴的偏振方向 ; 和(b)具有不同旋转特性的第一和第二区域的固定双折射板,使得所述板的所述第一区域截取所述源光束的第一部分,并且所述第二区域截取所述源光束的第二部分,所述第一和第二 区域改变不同量的所述源光束的所述第一和第二部分的偏振,以便形成具有第一偏振方向的中心部分和具有横向于所述第一偏振方向的第二偏振方向的周边部分的改变的光束, 围绕所述中心部分的周边部分,所述中心部分相对于所述光轴具有第一强度分布,所述周边部分相对于所述光轴具有第二强度分布; 和(c)至少一个偏振选择元件,其安装在所述双折射板的下游,所述至少一个偏振选择元件具有透射轴并且可操作以允许透射具有与透射轴平行的偏振方向的光并防止 透射具有垂直于透射轴的偏振方向的光。

    Illumination apparatus with polarizing elements for beam shaping
    5.
    发明授权
    Illumination apparatus with polarizing elements for beam shaping 失效
    具有用于光束成形的偏振元件的照明装置

    公开(公告)号:US06975456B2

    公开(公告)日:2005-12-13

    申请号:US10746313

    申请日:2003-12-24

    Abstract: Illumination apparatus includes a light source which directs a polarized source beam in a downstream direction along an optical axis and desirably focuses the beam. A polarization-altering element downstream from the source such as a birefringent plate alters the polarization in a portion or portions of the source beam, so that the altered beam includes portions having different polarization directions. The altered beam passes downstream through a polarization-selective filter. The output beam from the polarization-selective filter can include either portion depending on the orientation of the filter. The arrangement can be used to provide a spot of a given size and shape at the focal location in a scanner such as a bar code scanner. The size and depth of field of the spot can be varied dynamically during operation.

    Abstract translation: 照明装置包括沿着光轴沿着下游方向引导偏振光源光束并且期望聚焦光束的光源。 来自诸如双折射板的源极的偏振改变元件改变源光束的一部分或部分中的偏振,使得改变的光束包括具有不同偏振方向的部分。 改变的光束通过偏振选择滤光器向下游传播。 来自偏振选择滤光器的输出光束可以包括取决于滤光器的取向的任一部分。 该装置可用于在诸如条形码扫描仪的扫描仪中的焦点位置处提供给定尺寸和形状的斑点。 斑点的大小和深度可以在运行过程中动态变化。

Patent Agency Ranking