发明授权
US6084836A Defect detection apparatus for detecting defects on a recording medium
and reading apparatus incorporating the defect detection system
失效
用于检测记录介质上的缺陷的缺陷检测装置和结合有缺陷检测系统的读取装置
- 专利标题： Defect detection apparatus for detecting defects on a recording medium and reading apparatus incorporating the defect detection system
- 专利标题（中）： 用于检测记录介质上的缺陷的缺陷检测装置和结合有缺陷检测系统的读取装置
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申请号： US95421申请日： 1998-06-11
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公开(公告)号： US6084836A公开(公告)日： 2000-07-04
- 发明人: Hideyo Kamiyama
- 申请人： Hideyo Kamiyama
- 申请人地址： JPX Tokyo
- 专利权人： Pioneer Electronic Corporation
- 当前专利权人： Pioneer Electronic Corporation
- 当前专利权人地址： JPX Tokyo
- 优先权： JPX9-154758 19970612
- 主分类号： G11B7/004
- IPC分类号： G11B7/004 ; G11B7/0037 ; G11B7/09 ; G11B7/00
摘要：
A defect detection apparatus has a simple constitution and performs accurate defect detection while clearly differentiating between defect detection and tracking error detection. The defect detection apparatus includes a photodetector having a light-receiving area for receiving a return light beam from a recording medium irradiated with a light beam. A defect on the recording medium is detected based on an output from the photodetector. The defect detection apparatus according to the present invention comprises signal generation means for generating on the basis of an output from the photodetector at least two phase detection signals having phases which vary in a manner complementary to each other according to a deviation of the light beam from a track of the recording medium, adding means for adding up absolute value of the phase detection signal to generate a sum total signal having a value corresponding to a result of the addition, and discrimination means for comparing the value of the sum total signal with a predetermined reference value so as to generate a defect detection signal based on a result of the comparison.
公开/授权文献
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