Magnetic recording medium
AssigneeFuji Photo Film Co., Ltd.
InventorsHiroo Inaba, Kiyomi Ejiri, Jun-ichi Nakamikawa, Toshihiko Miura
Life of this patent
Estimating the term…
Abstract
Disclosed is a magnetic recording medium comprising at least two layers comprising at least one lower non-magnetic layer containing at least a non-magnetic particle and a binder on a non-magnetic support, and at least one upper magnetic layer containing at least a ferromagnetic particle and a binder on the lower non-magnetic layer, wherein a mean total thickness d of the upper magnetic layer is more than 0.01 .mu.m to less than 0.3 .mu.m, and a standard deviation .sigma. of the total thickness of the upper magnetic layer and the mean total thickness d of the upper magnetic layer satisfy the relationship of 0.05.ltoreq..sigma./d.ltoreq.0.5.
Claims20
A magnetic recording medium, comprising a non-magnetic support and at least two layers, the at least two layers comprising at least one lower non-magnetic layer comprising non-magnetic particles and a binder, one of the at least one non-magnetic layers being located on the non-magnetic support, and at least one upper magnetic layer comprising ferromagnetic particles and a binder, one of the at least one upper magnetic layers being located on the lower non-magnetic layer located on the non-magnetic support, wherein the upper magnetic layer located on the lower non-magnetic layer located on the non-magnetic support has a mean total thickness d more than 0.01 .mu.m to less than 0.3 .mu.m, and a standard deviation .sigma. of the total thickness of the upper magnetic layer located on the lower non-magnetic layer located on the non-magnetic support and the mean total thickness d satisfy the following relationship:
- 0.05<.sigma./d<0.5.
Dependencies are inferred from the claim text.