Magnetic recording medium having two magnetic layers comprising

Details Magnetic recording medium having two magnetic layers comprising Magnetic recording medium having two magnetic layers comprising

1993-11-24

1995-11-28

Resan, Stevan A.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

428323, 428328, 428329, 428336, 4284259, 428694BM, 428694BN, 428694BH, 428900, G11B 500

Patent

active

054706459

ABSTRACT:
A magnetic recording medium comprises a non-magnetic base material, a lower magnetic layer containing a magnetic powder for recording in a long wavelength range, and an upper magnetic layer containing a magnetic powder for recording in a short wavelength range. By adding a small particle abrasive with a median diameter in the range from 0.05 to 0.3 .mu.m to the upper magnetic layer and by properly selecting the type and amount of a resin binder contained in the upper magnetic layer, a satisfactory abrasion effect can be obtained. This effect can be obtained, even if the abrasive with a small particle diameter is used without necessity of increase of the amount thereof. In addition, by using this abrasive, even if the upper magnetic layer is thin, the surfaces of the upper magnetic layer and the lower magnetic layer can be smoothened. Therefore, an excellent magnetic recording medium having high recording and reproduction characteristics in a wide wavelength range and high running durability can be provided. In particular, the recording and reproduction characteristics in a short wavelength range can be improved. A hexagonal ferrite powder can be used as a magnetic powder for recording in a short wavelength range.

REFERENCES:
patent: 4511617 (1985-04-01), Hideyama et al.
patent: 4624894 (1986-11-01), Kishimoto
patent: 4643941 (1987-02-01), Miyoshi et al.
patent: 5077131 (1991-12-01), Nakano
patent: 5156908 (1992-10-01), Araki et al.
Patent Abstracts of Japan, vol. 14, No. 581 (P-1147) Dec. 26, 1990, & JP-A-2 249 129 (Konica Corporation), Oct. 4, 1990.

Affiliated with

Also associated with

Rating

Magnetic recording medium having two magnetic layers comprising does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Magnetic recording medium having two magnetic layers comprising , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Magnetic recording medium having two magnetic layers comprising will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2012218