Flying spot optical scanner with a high speed dithering motion
    71.
    发明授权
    Flying spot optical scanner with a high speed dithering motion 失效
    带高速抖动的飞点光学扫描仪

    公开(公告)号:US5648649A

    公开(公告)日:1997-07-15

    申请号:US508628

    申请日:1995-07-28

    IPC分类号: G06K7/10

    CPC分类号: G06K7/10851 G06K2207/1018

    摘要: An optical scanner includes a light source for producing a light beam for scanning a target wherein the light beam scans a target at a first low frequency and the beam also dithers in a direction orthogonal to the scanning direction at a second, high frequency. The dithering motion can be imparted by a oscillating mirror and allows improved reading of, for example, bar code symbols. In addition an optical scanner includes a laser light source producing a laser light beam into which a time-varying phase is introduced in order to reduce laser speckle noise.

    摘要翻译: 光学扫描器包括:光源,用于产生用于扫描目标的光束,其中光束以第一低频扫描目标,并且光束在与第二高频率的扫描方向正交的方向上抖动。 抖动动作可以由振动反射镜赋予,并且允许改进例如条形码符号的读取。 此外,光学扫描仪包括产生激光束的激光光源,其中引入了时变相,以减少激光散斑噪声。

    Holographic scanning
    76.
    发明授权
    Holographic scanning 失效
    全息扫描

    公开(公告)号:US5504595A

    公开(公告)日:1996-04-02

    申请号:US225350

    申请日:1994-04-08

    CPC分类号: G02B26/106 G06K7/10663

    摘要: A holographic grating element is provided which enables tracing different scan lines. The element is divided into a plurality of sectors. A first grating pattern is provided which diffracts a beam in one direction, and a second grating pattern is next to the first and diffracts the scan beam in the reverse direction. Sectors can be produced with different sector sizes to enable scanning at different rates in the reverse direction, or in successive scans in the same direction. Angle relationships are described to produce diffraction patterns for a desired relationship between disc rotation and the angle of the scan line.

    摘要翻译: 提供了一种能够跟踪不同扫描线的全息光栅元件。 该元件被分成多个扇区。 提供了在一个方向上衍射光束的第一光栅图案,并且第二光栅图案与第一光栅图案相邻,并沿相反方向衍射扫描光束。 扇区可以生产不同的扇区大小,以便能够以相反方向以不同速率进行扫描,也可以在相同方向上进行连续扫描。 描述角度关系以产生用于盘旋转和扫描线的角度之间期望关系的衍射图案。

    Piezoelectric beam deflector
    78.
    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。

    Monolithic electro-optic modulator array
    80.
    发明授权
    Monolithic electro-optic modulator array 失效
    单片电光调制器阵列

    公开(公告)号:US4744616A

    公开(公告)日:1988-05-17

    申请号:US704922

    申请日:1985-02-25

    摘要: A PIN GaAlAs diode structure is provided with parameters for index guiding of light in a single mode. The index of refraction of the central layer I (which in practice may be lightly doped .pi. or .nu.) is greater than the p- and n-layers to create a slab waveguide in the transverse direction. Stripe contacts define separate waveguide channels that are separated electrically and optically by implanting protons or etching grooves between the stripe contacts in the upper layer. Separate reverse biasing voltages may be applied to the stripe contacts for modulation of the light in proportions to the voltage, either with absorption modulation, if the light wavelength is within about 500.ANG. of the bandgap of the .pi.-material, or phase-delay modulation, if the wavelength is separated from the bandgap of the .pi.-material by at least 900.ANG..

    摘要翻译: PIN GaAlAs二极管结构具有用于在单个模式中的光的索引引导的参数。 中心层I的折射率(实际上可能是轻掺杂的pI或nu)大于p层和n层,以在横向上产生平板波导。 条纹触点限定了通过在上层中的条状接触之间注入质子或蚀刻凹槽而电和光学分离的分离的波导通道。 如果光波长在pi材料的带隙的约500安培范围内,或者通过吸收调制,则分离的反向偏压电压可以施加到带状触点,以与电压成比例地调制光,或者相位延迟调制 如果波长与pi材料的带隙分离至少900安培。