发明名称 |
Optical information record media |
摘要 |
<p>There is disclosed an optical information record medium having an optical information record layer on a transparent substrate, in which the transparent substrate is made of a resin material mainly consisting of a polycarbonate resin that contains no more than 4 wt % of low molecular weight fractions having a weight average measured with respect to a polystyrene molecular weight of no more than 3500, in order to avoid a double refraction of an optical information record medium resulting in an improved signal to noise ratio and having superior thermal-transformation resistance and impact resistance.</p> |
申请公布号 |
GB2197345(A) |
申请公布日期 |
1988.05.18 |
申请号 |
GB19870021956 |
申请日期 |
1987.09.18 |
申请人 |
* SONY CORPORATION |
发明人 |
KEIICHI * NITO;TOHRU * NAGAI;TSUTOMU * NOGUCHI;MAYUMI * MIYASHITA;JUNETSU * SETO;KATSUMI * KOHNO |
分类号 |
B41M5/26;C08G64/00;C08G64/40;G02B1/04;G11B7/24;G11B7/253;G11B11/105;(IPC1-7):G11B7/24 |
主分类号 |
B41M5/26 |
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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