The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 12, 1998
Filed:
Nov. 22, 1993
Akira Ishikawa, Menlo Park, CA (US);
Yuzuru Hosoe, Hino, JP;
Yoshihiro Shiroishi, Hachioji, JP;
Masatoshi Takeshita, Iruma, JP;
Yotsuo Yahisa, Kokubunji, JP;
Tomoo Yamamoto, Hachioji, JP;
Akira Osaki, Odawara, JP;
Kiwamu Tanahashi, Musashino, JP;
Jun Fumioka, Hadano, JP;
Yoshiki Kato, Tokyo, JP;
Masaki Ohura, Odawara, JP;
Yukio Katoh, Kokubunji, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
In a magnetic recording medium having a nonmagnetic disk substrate and a magnetic film formed on the surface of the non-magnetic disk substrate, a surface average roughness factor Ra(r) on the surface of the medium being from 0.3 nm to 3 nm, an orientation ratio of coercivity being from 0.1 to 0.7, and an in-plane magnetic anisotropic energy being from 3.times.10.sup.4 J/m.sup.3 to 5.times.10.sup.5 J/m.sup.3. By using such a medium, it is possible to provide a magnetic recording apparatus in which the magnetic head is capable of flying in a low position and high-density recording is achieved.