Magnetic recording disc comprising a non-magnetic underlayer and

Details Magnetic recording disc comprising a non-magnetic underlayer and Magnetic recording disc comprising a non-magnetic underlayer and

1992-10-13

1995-01-24

Resan, Stevan A.

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

428323, 428336, 428408, 428694BS, 428900, 428694BP, 427131, G11B 2300

Patent

active

053841751

ABSTRACT:
A novel magnetic recording disc is provided comprising, a nonmagnetic support having thereon a nonmagnetic layer comprising nonmagnetic particles and a binder resin, and a magnetic layer comprising ferromagnetic particles and a binder resin, in this order. The nonmagnetic particles in the nonmagnetic layer are partially or entirely electrically conductive particles, the thickness of the magnetic layer is in the range of 0.5 .mu.m or less, and the orientation ratio of the ferromagnetic particles in the magnetic layer is 0.85 or more.
A novel process for preparing the magnetic recording disc is provided. Further, a novel process for recording and reproduction of a signal having a shortest recordable wavelength of 1.5 .mu.m or less is provided, which utilizes the magnetic recording disc in conjunction with a magnetic head having a gap length (.delta.) of 0.50 .mu.m or less.

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Patent Abstracts of Japan, vol. 11, No. 389 (P-648) Dec. 19, 1987 & JP-A-62 154 225 (Hitachi Maxell Ltd), Jul. 9, 1987.
Patent Abstracts of Japan, vol. 15, No. 296, (P-1231) Jul. 26, 1991 & JP-A-31 02 634 (Konica Corp) Apr. 30, 1991.

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