Dynamic magnetic information storage or retrieval – Record copying – Contact transfer
Patent
1990-04-25
1991-07-16
Canney, Vincent P.
Dynamic magnetic information storage or retrieval
Record copying
Contact transfer
G11B 586
Patent
active
050329316
ABSTRACT:
A method for contact magnetic printing of recorded information is disclosed which comprises keeping in intimate mutual contact the magnetic surface of a recorded master magnetic recording medium and the magnetic surface of a blank slave magnetic recording medium which uses hexagonal ferrite magnetic particles as the magnetic material, controlling the temperature of the two-magnetic recording media so as to lower the coercive force of the slave magnetic recording medium relative to that of the master magnetic recording medium, and applying an external magnetic field thereto thereby causing the recorded information to be magnetically printed from the master magnetic recording medium to the slave magnetic recording medium. In accordance with this method, copies of pictures of high quality and sounds of highly desirable high-frequency characteristics can be produced by the contact magnetic printing technique using the slave magnetic recording medium possessing a coercive force equal to or greater than the coercive force of the master magnetic recording medium.
REFERENCES:
patent: 3676612 (1972-07-01), Kobayashi et al.
patent: 3913131 (1975-10-01), Kitamoto et al.
patent: 3982276 (1976-09-01), Roos
patent: 4277806 (1981-07-01), Jeffers et al.
Magnetic Recording, Technology, Editors C. D. Mee and E. D. Daniel, McGraw-Hill Book Company, vol. 1, pp. 56-66.
"Magnetization Transitions in Perpendicular Magnetic Recording", by T. Suzuki and S. Iwasaki, IEEE Transactions on Magnetics, vol. Mag-18, No. 2, Mar. 1982.
Isshiki Masanori
Suzuki Toshiyuki
Canney Vincent P.
Kabushiki Kaisha Toshiba
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