发明名称 |
OPTICAL RECORDING/REPRODUCTION DISC. |
摘要 |
PCT No. PCT/JP83/00029 Sec. 371 Date Oct. 4, 1983 Sec. 102(e) Date Oct. 4, 1983 PCT Filed Feb. 3, 1983 PCT Pub. No. WO83/02845 PCT Pub. Date Aug. 18, 1983.An optical recording/reproducing disc is formed of round plastic plates between which is a recording layer capable of optically recording and reproducing signals, and a round protective layer of plastic material provided on the recording layer and having at the outer peripheral end a projection higher by 10 to 200 mu than the inner peripheral surface of an effective recording/reproducing surface. Thus, when the disc is placed on a flat plane, a space is formed between the flat plane and the recording layer due to the projection, thereby preventing flaws from being produced by contact with dust or a foreign object. |
申请公布号 |
EP0105374(A4) |
申请公布日期 |
1985.07.01 |
申请号 |
EP19830900571 |
申请日期 |
1983.02.03 |
申请人 |
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. |
发明人 |
INOUE, TAKAO;MAEDA, YUKIO;UCHIDA, MASAMI |
分类号 |
G11B7/24;(IPC1-7):G11B7/24 |
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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