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:
Jan. 31, 2006
Filed:
Jun. 08, 2004
Akiko Watanabe, Miyagi, JP;
Katsunori Maeshima, Miyagi, JP;
Tomoo Fukuda, Miyagi, JP;
Noboru Sekiguchi, Miyagi, JP;
Akiko Watanabe, Miyagi, JP;
Katsunori Maeshima, Miyagi, JP;
Tomoo Fukuda, Miyagi, JP;
Noboru Sekiguchi, Miyagi, JP;
Sony Corporation, Tokyo, JP;
Abstract
The coating-type magnetic recording medium has a non-magnetic layer mainly composed of a non-magnetic powder and binder, and a magnetic layer mainly composed of a ferromagnetic powder and a binder, which are stacked in this order on a non-magnetic substrate, wherein dispersion σL/L of long-axis length of all ferromagnetic powder particles contained in the magnetic layer falls in a range of σL/L≦±10%, where L is an average long-axis length and σL is a standard deviation thereof, and dispersion σW/W of short-axis length of all ferromagnetic powders contained in the magnetic layer falls in a range of σW/W≦±15%, where W is an average short-axis length and σW is a standard deviation thereof. The average long-axis length L is typically adjusted within the range of 0.08 μm and 0.12 μm, and the Switching Field Distribution (SFD) of the medium is adjusted to 0.25 or less.