Information signal recording medium electrostatic capacitance ty

Dynamic information storage or retrieval – Specific detail of information handling portion of system – Electrical modification or sensing of storage medium

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252511, 26099816, 346151, 3461531, 358342, 358344, 365102, 369276, 369288, G11B 1108

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active

048274666

ABSTRACT:
A recording medium of electrostatic capacitance type is recorded with an information signal thereon as variation of geometrical shape of the recording surface part of the recording medium. The signal is reproduced from the recording medium by the variation, in response to the variation of geometrical shape, of the electrostatic capacitance between an electrode of a reproducing stylus tracing relatively the recording surface of the medium and the surface part. At least the surface part of the recording medium having the geometric shape variation is formed by a synthetic resin into which an electroconductive material has been admixed. The synthetic resin forms an outer surface cover of the surface part of the medium thereby to prevent exposure of the electroconductive material to the outside.

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