| 摘要 |
A laser scanning apparatus including an optical source installed on a main frame, a scan disk which is rotatably installed on the main frame and has diffraction patterns formed thereon for deflecting a beam emitted from the optical source in a predetermined direction to achieve a normal light path, and a means for shielding an abnormal beam that is emitted from the optical source and diffracted or reflected off the normal light path by the scan disk.
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