Piezoelectric beam deflector
    14.
    发明授权
    Piezoelectric beam deflector 失效
    压电束偏转器

    公开(公告)号:US5170277A

    公开(公告)日:1992-12-08

    申请号:US766315

    申请日:1991-09-27

    摘要: Several embodiments are disclosed of bar code readers in which one or more piezoelectric bimorph elements are utilized as a drive element in the optical system thereof. In different embodiments, the piezoelectric bimorph element is utilized in the scanning function of the bar code reader optical system, or in a variable focus zooming function of the optical system. The bar code readers are provided with improved decoding reliability, speed and orientation freedom, with regular or high density, one or two dimensional bar codes, by using multiple beam symbol crossings, created by using one or more piezoelectric bimorph elements. In different disclosed embodiments, one or more cantilever mounted piezoelectric bimorph elements support a scanning mirror, or a focusing lens, or a laser diode, or a laser diode and limiting aperture, for movement at the free ends of the bimorph elements to produce a scanning of the bar code reader optical system. Several disclosed embodiments of the subject invention provide a beam deflector for a bar code reader optical system having a variable focus zoom lens system in which one or more cantilever mounted piezoelectric bimorph elements control the variable focus zoom lens system. 1

    摘要翻译: 公开了条形码阅读器的几个实施例,其中一个或多个压电双晶片元件用作其光学系统中的驱动元件。 在不同的实施例中,压电双晶片元件用于条形码读取器光学系统的扫描功能,或者以光学系统的可变焦距变焦功能。 通过使用通过使用一个或多个压电双晶片元件产生的多个光束符号交叉,条形码读取器具有改进的解码可靠性,速度和取向自由度,具有规则或高密度,一维或二维条形码。 在不同的公开的实施例中,一个或多个悬臂安装的压电双晶片元件支撑扫描镜,聚焦透镜或激光二极管,或激光二极管和限制孔,用于在双压电晶片元件的自由端处移动以产生扫描 的条码阅读器光学系统。 本发明的几个公开的实施例提供了一种用于具有可变焦距变焦透镜系统的条形码读取器光学系统的光束偏转器,其中一个或多个悬臂安装的压电双晶片元件控制可变焦距变焦透镜系统。

    Optical scanner using an axicon and an aperture to aspherically form the
scanning beam
    18.
    发明授权
    Optical scanner using an axicon and an aperture to aspherically form the scanning beam 失效
    光学扫描仪使用旋转三棱镜和光圈以非球面形成扫描光束

    公开(公告)号:US5331143A

    公开(公告)日:1994-07-19

    申请号:US936472

    申请日:1992-08-28

    IPC分类号: G06K7/015 G06K7/10

    CPC分类号: G06K7/10811 G06K2207/1013

    摘要: The use of linear axicons or similar optical elements in a bar code scanner produces a scanning spot of a size correlated generally with dimensions of features of the scanned information, wherein the spot size remains substantially constant for varying distances between the scanner and the symbol over a substantial range of distances. Optical elements of this type produce a diffraction pattern comprising a central lobe and a number of rings surrounding the central lobe. An aperture is provided to limit the beam and thus the number of rings in the pattern which actually reach the symbol during scanning. The extent of the limited beam and the phase front tilt angle produced by the optical element are chosen to produce a desired resolution, which relates to the density of symbols the scanner is to read, and to produce a desired working range. The invention also provides a modular light emitting device including a universal light emitting module and an optical assembly, including the axicon and aperture, mounted on the module to adapt the optical characteristics of light from the module to conform to the requirements of a particular scanning application.

    摘要翻译: 在条形码扫描仪中使用线性轴或相似的光学元件产生与扫描信息的特征的尺寸大体相关联的尺寸的扫描点,其中斑点尺寸保持基本上恒定,用于在扫描仪和符号之间的距离变化 相当的距离范围。 这种类型的光学元件产生衍射图案,该衍射图案包括中央凸起部分和围绕中央凸起部分的多个环形体。 提供孔径以限制光束,并因此限制扫描期间实际到达符号的图案中的环的数量。 选择由光学元件产生的有限光束的范围和相位前倾斜角度以产生期望的分辨率,其涉及扫描仪要读取的符号的密度,并产生所需的工作范围。 本发明还提供一种模块化发光装置,其包括通用发光模块和光学组件,其包括安装在模块上的轴向和孔径,以适应来自模块的光的光学特性以符合特定扫描应用的要求 。