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:
Nov. 28, 1989
Filed:
Dec. 15, 1987
Yoshihiro Shiroishi, Hachiouji, JP;
Sadao Hishiyama, Sayama, JP;
Hiroyuki Suzuki, Kawasaki, JP;
Tomoyuki Ohno, Kokubunji, JP;
Yoshibumi Matsuda, Kokubunji, JP;
Kazumasa Takagi, Tokyo, JP;
Norikazu Tsumita, Kanagawa, JP;
Yasushi Kitazaki, Odawara, JP;
Masaki Ohura, Odawara, JP;
Sadanori Nagaike, Odawara, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A magnetic recording medium in which a non-magnetic intermediate layer made of an alloy substantially composed of at least one element selected from the group consisting of Zr, Hf, Ta, Ti and Nb is disposed between a magnetic layer formed on a substrate and a non-magnetic overcoat layer formed on the magnetic layer. Since the impact shock resistance and the vibration resistance of the magnetic recording medium can be improved and the head-medium spacing of the magnetic disc apparatus can be decreased extremely by disposing the non-magnetic intermediate layer, it can provide a increase in the recording density, particularly, in a thin film type magnetic recording medium using a metallic magnetic thin film or metal oxide thin film as the magnetic layer. It can also improve the corrosion resistance in the case of a metallic magnetic thin film type medium.