17 September 2002 3D profiles of scratches on optical disks and their effect on a bit engine
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Scratches are common defects on the surface of optical disks and affect the status of the servo system and the readout of data, sometimes they even cause the breakdown of the system. To understand the mechanism, it is necessary to investigate profiles of scratches and their influence on the servo system and the HF signal. In this paper, the 3D profiles of more than 15 scratches have been measured, and the scratches are defined as U-type, W-type and M-type respectively. The experiments show that the rough surfaces of scratches scatter away the incident light heavily, and finally reduce the light intensity and change the intensity distribution on the exit pupil plane. The influences of the U-type scratch, W-type scratch and the M-type scratch on a servo system and HF signal are discussed.
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Jianyi Zhong, Jianyi Zhong, J. M. den Hollander, J. M. den Hollander, Henk Goossens, Henk Goossens, Zhongjin Guo, Zhongjin Guo, Jiagang Zhang, Jiagang Zhang, } "3D profiles of scratches on optical disks and their effect on a bit engine", Proc. SPIE 4930, Advanced Optical Storage Technology, (17 September 2002); doi: 10.1117/12.483313; https://doi.org/10.1117/12.483313

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