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:
Dec. 20, 1988
Filed:
Jan. 28, 1988
Hiroyuki Suzuki, Kawasaki, JP;
Yoshihiro Shiroishi, Hachioji, JP;
Sadao Hishiyama, Sayami, JP;
Tomoyuki Ohno, Kokubunji, JP;
Kazuetsu Yoshida, Kodaira, JP;
Shyuichi Kojima, Odawara, JP;
Susumu Funamoto, Odawara, JP;
Yasushi Kitazaki, Odawara, JP;
Sakae Ohta, Odawara, JP;
Hajime Aoi, Tachikawa, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
Disclosed is a magnetic recording medium of the magnetic metal thin-film type for longitudinal recording, in which the noise is reduced by selecting the value of maximum torque L (the product of magnetic anisotropy energy Ku and magnetic layer volume v; as measured by setting the axis of rotation in plane of the medium) and the value of magnetic flux .phi. (the product of saturation magnetization Ms and magnetic layer volume v) from a range defined by 0<L/(2.pi..multidot..phi..sup.2)<4.times.10.sup.5 (erg/emu.sup.2).