发明名称 |
Optical disc |
摘要 |
A compact disc (CD) has a first centering hole having a first radius and has annular projection rings on both sides of the CD. The center of the ring is coaxial with the center of the first centering hole. A radius of an outer periphery of each of the projection rings is smaller than a second radius of a second centering hole of a video disc.
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申请公布号 |
US6011771(A) |
申请公布日期 |
2000.01.04 |
申请号 |
US19970802345 |
申请日期 |
1997.02.11 |
申请人 |
PIONEER ELECTRONIC CORPORATION |
发明人 |
AKAMA, YUSUKE;ISHIKAWA, TOMONARI |
分类号 |
G11B7/24;G11B17/028;G11B17/04;(IPC1-7):G11B25/04 |
主分类号 |
G11B7/24 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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