发明公开
EP1327980A3 Rotation control apparatus operating with a sync signal having variable intervals
失效
基本信息:
- 专利标题： Rotation control apparatus operating with a sync signal having variable intervals
- 专利标题（中）：与具有可变的时间间隔的同步信号的速度控制装置
- 申请号：EP03008472.7 申请日：1997-03-11
- 公开(公告)号：EP1327980A3 公开(公告)日：2006-11-22
- 发明人： Kuroda, Kazuo , Yoshida, Masayoshi , Suzuki, Toshio
- 申请人： PIONEER ELECTRONIC CORPORATION
- 申请人地址： 4-1, Meguro 1-chome Meguro-ku, Tokyo JP
- 专利权人： PIONEER ELECTRONIC CORPORATION
- 当前专利权人： PIONEER ELECTRONIC CORPORATION
- 当前专利权人地址： 4-1, Meguro 1-chome Meguro-ku, Tokyo JP
- 代理机构： Manitz, Finsterwald & Partner GbR
- 优先权： JP8457896 19960313
- 主分类号： G11B19/28
- IPC分类号： G11B19/28 ; G11B20/10
摘要：
A rotation control apparatus which can maintain an accurate rotating state even in a DVD having a structure such that parts of the sync signal are recorded at an interval different from that of the other sync signal parts. The apparatus has: unit period signal generator for generating a period signal of a unit period; pre-pit detector for detecting a pre-pit from the DVD; phase difference detector for detecting a phase difference between the detection timing of the pre-pit and the unit period signal; and holding circuit for holding the phase difference detected. The rotation of the DVD is controlled on the basis of the phase difference held at the holding circuit.