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:
Sep. 23, 1997
Filed:
Mar. 06, 1995
Katsuya Mitsuoka, Hitachi, JP;
Hiroshi Fukui, Hitachi, JP;
Makoto Aihara, Katsuta, JP;
Masanori Tanabe, Hitachi, JP;
Moriaki Fuyama, Hitachi, JP;
Shinji Narishige, Mito, JP;
Yutaka Sugita, Tokorozawa, JP;
Yoshihiro Shiroishi, Hachioji, JP;
Hajime Aoi, Tachikawa, JP;
Yokuo Saitoh, Kanagawa-ken, JP;
Kanji Kawakami, Mito, JP;
Yoshikazu Tsuji, Kanagawa-ken, JP;
Masaaki Hayashi, Odawara, JP;
Kazuo Nakagoshi, Odawara, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A magnetic disc apparatus has a large recording density of 120 megabits per square inch or more, and defines a relationship among a pole thickness (Pt) of thin-film magnetic heads disposed in the magnetic disc apparatus, and a saturation flux density (Bs) of cores of the heads and a recording wavelength (.lambda.) for the thin film magnetic discs have a coercivity of 1800 Oe or more, wherein a levitation space between the head and the disc is 0.15 .mu.m or less.