发明名称 |
Tracking signal generating device and method, and magnetic recording/reproducing system |
摘要 |
A device and a method are provided in which stable tracking control can be carried out even in an arbitrary phase by optically reading pits provided in a disk when information is recorded on and reproduced from the disk with a magnetic head. With respect to difference signals obtained from a main beam signal and sub-beam signals obtained through three-beam type photodetectors, gain correction is executed in variable gain amplifiers, respectively, so that output signals therefrom have same amplitude levels and are different in phase by 90 degrees in a track crossing direction, and thus a tracking error signal is generated by being synthesized from the output signals. Based on the tracking error signal, tracking control is carried out.
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申请公布号 |
US2001004304(A1) |
申请公布日期 |
2001.06.21 |
申请号 |
US20000736798 |
申请日期 |
2000.12.14 |
申请人 |
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. |
发明人 |
SANO KOUSEI;KADOWAKI SHIN-ICHI;HATADA HAJIME;OHMURA IKUO |
分类号 |
G11B5/55;G11B5/596;(IPC1-7):G11B5/596 |
主分类号 |
G11B5/55 |
代理机构 |
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