Magnetic recording medium

Details Magnetic recording medium Magnetic recording medium

1991-11-12

1992-08-18

Thibodeau, Paul J.

Stock material or miscellaneous articles

Structurally defined web or sheet

Continuous and nonuniform or irregular surface on layer or...

427131, 4284735, 428694, 428900, G11B 2300

Patent

active

051398494

ABSTRACT:
A magnetic recording medium comprises a substrate composed of a polyimide film bearing, on a face thereof, a polyimide coated layer containing inorganic particles dispersed therein, and a magnetic recording layer formed on said polyimide coated layer.
A magnetic recording medium comprises a substrate composed of a polyimide film containing inorganic particles dispersed therein and bearing, on a face thereof, a polyimide coated layer containing inorganic particles dispersed therein, and a magnetic recording layer formed on the other face of said polyimide film, wherein the average particle size of the inorganic particles dispersed in said polyimide film is smaller than that of the inorganic particles dispersed in said polyimide coated layer.
A magnetic recording medium comprises a magnetic recording layer formed by a thin film deposition process on a substrate, wherein said substrate is provided, on the surface thereof, with small projections with a density of 10.sup.5 to 10.sup.8 projections/mm.sup.2, and the statistical distribution of the heights of said projections satisfies following relations H.sub.0.01 <600 .ANG., H.sub.0.1 >120 .ANG., H.sub.1 >100 .ANG. and H.sub.0.1 -H.sub.1 <200 .ANG., in which H.sub.0.01, H.sub.0.1 and H.sub.1 are the heights of projections respectively corresponding to 0.01%, 0.1% and 1% of the total number of projections in the descending order of height.
A magnetic recording medium comprises a magnetic recording layer formed by a thin film deposition process on a substrate containing inorganic particles dispersed therein, wherein said substrate is provided, on the surface thereof, with small projections with a density of 10.sup.5 to 10.sup.8 projections/mm.sup.2, wherein said inorganic particles are mostly dispersed to the level of primary particles, and wherein the distribution of the heights of projections on the surface of the substrate satisfies following relations:

REFERENCES:
patent: 4474843 (1984-10-01), Miyoshi et al.
patent: 4528240 (1985-07-01), Miyoshi et al.
patent: 4544574 (1985-10-01), Itami et al.
patent: 4578729 (1986-03-01), Suzuki et al.
patent: 4612235 (1986-09-01), Ushimaru et al.
patent: 4619856 (1986-10-01), Kamada et al.
patent: 4645703 (1987-02-01), Suzuki et al.
patent: 4664941 (1987-05-01), Washburn
patent: 4684572 (1987-08-01), Yasufuku et al.
patent: 4778707 (1988-10-01), Arioka et al.
patent: 4816351 (1989-03-01), Takagi et al.
patent: 4910068 (1990-03-01), Takagi et al.
Patent Abstracts of Japan, vol. 9, No. 289 (1985) p. 405.
Patent Abstracts of Japan, vol. 9, No. 9 (1985) p. 327.
Patent Abstracts of Japan, vol. 10, No. 160 (1986) p. 465.

Affiliated with

Also associated with

Rating

Magnetic recording medium 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, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Magnetic recording medium will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1247760