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:
Mar. 15, 2005
Filed:
Aug. 30, 2001
Yasuyuki Ookuma, Kokubunji, JP;
Kenji Maio, Tokyo, JP;
Yoichiro Kobayashi, Ome, JP;
Hiroyasu Yoshizawa, Ome, JP;
Yasuyuki Ookuma, Kokubunji, JP;
Kenji Maio, Tokyo, JP;
Yoichiro Kobayashi, Ome, JP;
Hiroyasu Yoshizawa, Ome, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A magnetic head driving circuit includes a main driving circuit symmetrical with respect to a centered recording coil, and at least two pairs of adding circuits, each pair including a positive pulse adding circuit and a negative pulse superposed circuit symmetrical with respect to the centered coil. And, by reversing the direction of the magnetic head coil current, at least one of the adding circuits is made to operate and make it as a magnetic head driving circuit for adding a potential equal to or higher than the power supply, thereby to drive as a sub-driving circuit arranged symmetrically with respect to the centered coil, which promotes the reversal of the magnetic head coil current, and which drives stably with a central potential of the coil at about the disk potential.