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. 25, 1999
Filed:
Aug. 26, 1996
Kenjiro Watanabe, Tokyo, JP;
Toru Takeda, Saitama, JP;
Satoru Seko, Kanagawa, JP;
Kazushige Kawazoe, Kanagawa, JP;
Takayasu Muto, Kanagawa, JP;
Osamu Morita, Kanagawa, JP;
Nobuhiro Hayashi, Kanagawa, JP;
Takehisa Ishida, Tokyo, JP;
Hideaki Ishioka, Kanagawa, JP;
Takamichi Yamakoshi, Kanagawa, JP;
Sony Corporation, Tokyo, JP;
Abstract
A magnetic disk drive device that includes a disk-shaped medium with a magnetic film formed on a surface for recording or reproducing information, and a magnetic head for recording on and reproducing information from the disk-shaped medium. The disk-shaped medium has a data recording region and a control signal recording region. The data recording region is impressed to have convex recording regions for recording data and concave guard bands for separating adjacent recording regions. The control signal recording region has impressed concavities and convexities representing tracking marks (for effecting tracking control of the magnetic head), track number indicating marks and track numbers (for identifying the tracks), and clock marks dividing one circumference into equal intervals along a path of angular movement of the magnetic head. The disk-shaped medium has reduced track pitch and increased recording capacity because the concave guard bands can be very narrow without inducing crosstalk, and the tracking marks, track number indicating marks, and clock marks are impressed as concavities and convexities along the path of angular movement of the magnetic head.