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. 22, 2007
Filed:
Mar. 02, 2005
Mitsuo Otsuki, Tokyo, JP;
Hiroshi Kiyono, Tokyo, JP;
Nobutaka Nishio, Tokyo, JP;
Hiroki Matsukuma, Tokyo, JP;
Mitsuo Otsuki, Tokyo, JP;
Hiroshi Kiyono, Tokyo, JP;
Nobutaka Nishio, Tokyo, JP;
Hiroki Matsukuma, Tokyo, JP;
TDK Corporation, Tokyo, JP;
Abstract
The invention is directed to a magnetic head driving circuit and a magnetic disk device which achieve a low flying-height with thermal protrusion and thus a reliable write operation on the magnetic disk. The write circuitreceives the write data signal Sw inputted therein, and generates and outputs the write voltages Wx, Wy based upon the inputted signal. The write voltages Wx, Wy are composed of a preamble portion T, a sink mark Tand a user data portion Tin each sector for magnetic recording. In the write voltage, the frequency f2 of the signal in the preamble portion Tis higher than half the frequency f1 of the signal in the user data portion T