发明名称 |
Optical disk drive detecting disk surface deviation |
摘要 |
An optical disk drive capable of detecting a surface deviation of a disk during a very short period includes an analog-to-digital converter (ADC) converting a focus error signal output from a pickup into digital data, and a central processing unit (CPU) writing an output of the ADC to a memory during one rotation of a motor according to a timing of a pulse signal output from a spindle motor. After that, the CPU reads data written to the memory and obtains a sine curve that minimizes the sum of squares of errors among data by a least square method. The CPU obtains a peak-to-peak value of the obtained sine curve and compares the peak-to-peak value to a predetermined threshold value, thereby determining the existence of the surface deviation of the disk.
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申请公布号 |
US7440373(B2) |
申请公布日期 |
2008.10.21 |
申请号 |
US20040771503 |
申请日期 |
2004.02.05 |
申请人 |
SAMSUNG ELECTRONICS CO., LTD. |
发明人 |
SEKIYA HARUTAKA |
分类号 |
G11B7/00;G11B7/004;G11B7/0037;G11B7/09;G11B7/095 |
主分类号 |
G11B7/00 |
代理机构 |
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代理人 |
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地址 |
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