发明名称 |
Information signal record medium of the capacitance type |
摘要 |
An improvement is provided in and relating to a capacitance-type record medium wherein an information signal is recorded as a variation in the geometrical shape of its surface area, and is played back by the variation of the capacitance between its surface and an electrode of a reproducing stylus scanning the surface of the record medium relatively which occurs according to a variation in the geometrical shape of its surface area. The improvement consists in the fact that at least the surface area of the record medium is formed of (1) a material composed of an electrically conductive substance and a copolymer consisting of 98 to 65% by weight of vinyl chloride, 2 to 20% by weight of an alkyl vinyl ether with the alkyl group having 4 to 18 carbon atoms and/or a vinyl ester of a fatty acid in which the fatty acid residue has 4 to 18 carbon atoms and 0 to 15% by weight of another monomer copolymerizable with these compounds, or (2) a material composed of an electrically conductive substance and a polymer mixture consisting of at least two polymers in which the proportions of the constituent monomers are the same as in the aforesaid copolymer.
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申请公布号 |
US4351747(A) |
申请公布日期 |
1982.09.28 |
申请号 |
US19800201592 |
申请日期 |
1980.10.28 |
申请人 |
NIPPON ZEON CO. LTD. |
发明人 |
MIYAMOTO, KAZUMICHI;NISHIZAWA, AKIRA;OKUDA, TAKAO;NAKAMURA, MAMORU;ABE, TAKAHARU |
分类号 |
C08K3/04;C08K3/08;G11B9/06;(IPC1-7):H01B1/06 |
主分类号 |
C08K3/04 |
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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