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    • 7. 发明授权
    • Hand-supportable planar laser illumination and imaging (PLIIM) device
    • 手持平面激光照明和成像(PLIIM)设备
    • US06948659B2
    • 2005-09-27
    • US10105031
    • 2002-03-22
    • Constantine J. TsikosC. Harry KnowlesMichael D. SchneeTimothy A. Good
    • Constantine J. TsikosC. Harry KnowlesMichael D. SchneeTimothy A. Good
    • G02B6/42G02B27/48G06C11/08G06F17/00G06K7/10G06K7/14G06K9/22G07B15/06H01S3/00H01S3/08H01S5/00H01S5/022H01S5/40
    • G06K7/10G02B19/0014G02B19/0052G02B19/0085G02B19/009G02B19/0095G02B26/10G02B27/095G02B27/48G06K7/10594G06K7/10732G06K7/146G06K9/26G06K9/325H01S5/005H01S5/02248H01S5/4025
    • A hand-supportable linear-type planar laser illumination and imaging (PLIIM) based device comprising a linear image formation and detection (IFD) module having a linear array of image detection elements and also image formation optics having a field of view (FOV) focusing a linear image of an object onto the linear array of image detection elements. A pair of planar laser illumination arrays (PLIAs) is arranged on opposite sides of the linear image formation and detection module, and produces a plurality of spatially-incoherent planar laser illumination beam (PLIB) components that are optically combined with respect to other PLIB components so as to produce a composite planar laser illumination beam (PLIB) that is arranged in a coplanar relationship with at least a portion of the FOV. Each PLIA includes a plurality of planar laser illumination modules (PLIMs). Each PLIM includes a laser diode and beam focusing and diverging optics for producing one spatially-incoherent PLIB component. The composite PLIB produces a number of substantially different individual speckle noise patterns at the linear array of image detection elements during the photo-integration time period thereof. The speckle noise power observed at the linear array of image detection elements is reduced through temporal averaging of the individual speckle noise patterns during the photo-integration time period. By virtue of the present invention, it is now possible to use visible laser diodes (VLDs) to produce speckle-reduced images of objects suitable for OCR processing, while enjoying improved working distances offered by planar laser illumination techniques.
    • 一种手持式线性平面激光照明和成像(PLIIM)设备,包括具有图像检测元件线性阵列的线性图像形成和检测(IFD)模块,以及具有视场聚焦(FOV)聚焦的图像形成光学器件 物体的线性图像到图像检测元件的线性阵列上。 一对平面激光照明阵列(PLIA)布置在线性图像形成和检测模块的相对侧上,并且产生多个相对于其它PLIB组件光学组合的空间非相干平面激光照明光束(PLIB)部件 以便产生与FOV的至少一部分以共面关系布置的复合平面激光照明光束(PLIB)。 每个PLIA包括多个平面激光照明模块(PLIM)。 每个PLIM包括激光二极管和用于产生一个空间非相干PLIB组件的光束聚焦和发散光学器件。 复合PLIB在其光积分时间段期间在图像检测元件的线性阵列处产生许多基本上不同的单个斑点噪声图案。 在光积分时间段期间,通过对各个散斑噪声模式的时间平均,减少了在图像检测元件的线性阵列处观察到的斑点噪声功率。 凭借本发明,现在可以使用可见激光二极管(VLD)来产生适于OCR处理的物体的散斑图像,同时享受由平面激光照射技术提供的改进的工作距离。