Hitachi Maxell, Limited

Yoshiyuki Makita

Masakazu Tani

Kenichiro Yoshida

Norihisa Yoshimoto

A magnetic recording medium comprising a non-magnetic support, at least one primer layer formed on one surface of the non-magnetic support, a magnetic layer formed on the primer layer, and a backcoat layer formed on the other surface of the non-magnetic support, wherein the magnetic layer has a thickness of 0.30 &#x3bc;m or less and a centerline average surface roughness Ra of 3.2 nm or less, and (P&#x2212;P) is 30 nm or less and (P&#x2212;P) is 5 nm or less in which Pis an averaged height of projections of the magnetic layer, and P, P, - - - and Pare heights of the highest, the second highest, - - - and the 20th highest projections of the magnetic layer, respectively.

Magnetic recording medium comprising a magnetic layer having specific thickness, surface roughness and projections

Magnetic recording medium comprising a magnetic layer having specific thickness and projections

A magnetic recording medium comprising a non-magnetic support, at least one primer layer formed on one surface of the non-magnetic support, a magnetic layer formed on the primer layer, and a backcoat layer formed on the other surface of the non-magnetic support, wherein the magnetic layer has a thickness of 0.30 &#x3bc;m or less and a centerline average surface roughness Ra of 3.2 nm or less, and (P&#x2212;P) is 30 nm or less and (P-P) is 5 nm or less in which Pis an averaged height of projections of the magnetic layer, and P, P, - - - and Pare heights of the highest, the second highest, - - - and the 20th highest projections of the magnetic layer, respectively.

Magnetic recording medium comprising a magnetic layer having specific thickness, surface roughness and friction coefficient

A magnetic recording medium comprising a non-magnetic support, at least one primer layer formed on one surface of the non-magnetic support, a magnetic layer formed on the primer layer, and a backcoat layer formed on the other surface of the non-magnetic support, wherein the magnetic layer has a thickness of 0.30 &mgr;m or less and a centerline average surface roughness Ra of 3.2 nm or less, and (P &minus;P ) is 30 nm or less and (P &minus;P ) is 5 nm or less in which P is an averaged height of projections of the magnetic layer, and P , P , - - - and P are heights of the highest, the second highest, - - - and the 20th highest projections of the magnetic layer, respectively.

Growing community of inventors

Kyoto-fu, Japan

Yoshiyuki Makita