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. 02, 2007
Filed:
Apr. 22, 2005
Katsumichi Tagami, Tokyo, JP;
Yoshikazu Soeno, Tokyo, JP;
Kazuya Shimakawa, Tokyo, JP;
Hiroki Matsukuma, Tokyo, JP;
Katsumichi Tagami, Tokyo, JP;
Yoshikazu Soeno, Tokyo, JP;
Kazuya Shimakawa, Tokyo, JP;
Hiroki Matsukuma, Tokyo, JP;
TDK Corporation, Tokyo, JP;
Abstract
The burst pattern shape in a discrete medium is set to a shape (truncated quadrangular pyramid shape) having substantially trapezoidal shapes in a track width direction and in a track circumferential direction, respectively, and a predetermined relationship is satisfied among WWTp, and Wr where Wrepresents an upper side corresponding to the surface of a convex magnetic recording layer and Wa lower side corresponding to the lower surface of the convex magnetic recording layer in the trapezoidal shape in the track width direction, Tp represents a data track pitch of a data information recording portion, and Wr represents a read width of a magnetic head. Therefore, the burst pattern shape makes it possible to largely reduce a production load in processing and still to obtain an accurate position error signal.