发明名称 |
Disc for recording information signals. |
摘要 |
<p>A disc (1) for recording information signals includes a disc substrate (2) of a synthetic resin having a central hole (3), an information signal recording layer formed on one major surface (2a) and a magnetic plate (5) provided on the major surface (2a) to close the central hole (3). A recess (6) to accommodate the magnetic plate is formed in the major surface (2a) of the disc substrate (2) and surrounds the central hole (3). At least a part of a rim of the recess (6) is thermally deformed to form one or more lugs (11) which hold the magnetic plate (5) disposed in the recess (6) with respect to the disc substrate (2). <IMAGE></p> |
申请公布号 |
EP0521654(A2) |
申请公布日期 |
1993.01.07 |
申请号 |
EP19920305850 |
申请日期 |
1992.06.25 |
申请人 |
SONY CORPORATION |
发明人 |
TAKAHASHI, KENJI PATENTS DIVISION;CHIBA, SACHIYA PATENTS DIVISION;KOBAYASHI, DAIKI PATENTS DIVISION |
分类号 |
G11B23/00 |
主分类号 |
G11B23/00 |
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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