MAGNETIC RECORDING MEDIUM AND PRODUCTION THEREOF

PURPOSE:To obtain a good output and S/N of shallow layer recording signals by nearly equaling the thickness of a 2nd magnetic layer to the effective recording depth of video recording signals and setting the coercive force of the 2nd magnetic layer larger than the coercive force of the 1st magnetic...

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Bibliographische Detailangaben
Hauptverfasser:	YAMAKAWA YOSHISUKE, KAWAHARA HIROSHI, HONJO YOSHIHIRO, HAYAMA SHINJI
Format:	Patent
Sprache:	eng
Schlagworte:	ADHESIVES CHEMICAL PAINT OR INK REMOVERS CHEMISTRY COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS CORRECTING FLUIDS DYES ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY FILLING PASTES GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS INFORMATION STORAGE INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER INKS METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS NATURAL RESINS PAINTS PASTES OR SOLIDS FOR COLOURING OR PRINTING PHYSICS PICTORIAL COMMUNICATION, e.g. TELEVISION POLISHES TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION TECHNICAL SUBJECTS COVERED BY FORMER USPC TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ARTCOLLECTIONS [XRACs] AND DIGESTS USE OF MATERIALS THEREFOR WOODSTAINS
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Beschreibung
Zusammenfassung:	PURPOSE:To obtain a good output and S/N of shallow layer recording signals by nearly equaling the thickness of a 2nd magnetic layer to the effective recording depth of video recording signals and setting the coercive force of the 2nd magnetic layer larger than the coercive force of the 1st magnetic layer. CONSTITUTION:The 1st magnetic layer and the 2nd magnetic layer are successively formed on a substrate and the thickness of the 2nd magnetic layer is set nearly equal to the effective recording depth of the video recording signals. The coercive force of the 2nd magnetic layer is set larger than the coercive force of the 1st magnetic layer. The video recording signals which are superposedly recorded and are partly erased among the high-fidelity audio recording signals are only the signals recorded in the 2nd magnetic layer and the erasing rate of this time is extremely low as the 2nd magnetic layer has the high coercive force. The decrease rate of the output of the high-fidelity audio recording signal due to superposed recording is thus extremely lowered.