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US 4,624,892 AGranted
Magnetic recording medium
AssigneeTDK Corporation
InventorsHideki Ishizaki, Hiroyuki Arioka, Toshiaki Ide
Life of this patent
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Abstract
A magnetic recording medium comprising a magnetic recording layer formed on one major surface of a non-magnetic substrate and a topcoat layer formed on the magnetic layer is characterized in that the topcoat layer contains a submicron particulate pigment observable under an electron microscope to have a linear distribution density of 10 to 1,000 per linear 100 .mu.m and a particle size of less than 200 .ANG. whereby the topcoat layer has a surface roughness R20 of not more than 400 .ANG..
Claims15
In a magnetic recording medium comprising
- a non-magnetic substrate having opposed major surfaces,
- a magnetic recording layer formed on one major surface of the substrate, and
- a topcoat layer formed on the magnetic layer,
- the improvement wherein the topcoat layer contains a submicron particulate pigment observable under an electron microscope to have a linear distribution density of 10 to 1,000 per linear 100 .mu.m and a particle size of less than 200 .ANG. whereby the topcoat layer has a surface roughness R20 of not more than 400 .ANG..
1 more element
Dependencies are inferred from the claim text.