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:
Nov. 23, 2010
Filed:
Sep. 29, 2005
Shingo Hokuto, Kyoto, JP;
Yujiro Okamoto, Kyoto, JP;
Shingo Hokuto, Kyoto, JP;
Yujiro Okamoto, Kyoto, JP;
Rohm Co., Ltd., , JP;
Abstract
A magnetic recording and reproducing device is a hard disk device which writes information onto a magnetic disk (not shown), or reads information therefrom, and includes: a reproducing head; a recording head; and a magnetic head driving circuit. The magnetic head driving circuit is a circuit, by which driving of the reproducing head and the recording head is controlled, and onto which the reproducing head, a recording head driving circuit, a control unit, and a variable impedance element are integrated. This magnetic head driving circuit is switched on a time division base to a read mode during reproducing operation, and to a write mode during recording operation. The control unit reduces the impedance of the variable impedance element during the write mode.