Aperture controlled laser beam shaping techniques for scanning optical code
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机译:用于扫描光学代码的孔径控制激光束整形技术
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摘要
An improved optical system for scanning optical codes is disclosed. A laser beam produced thereby is a diverging, nearly diffraction free beam and may be used to produce an elongated scanning spot. An aperture may be employed such that variation in size of the aperture in one orthogonal dimension varies the size of the scanning spot in another orthogonal dimension.
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