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:
Dec. 25, 2001
Filed:
Mar. 16, 1999
Hiroaki Yoda, Kanagawa-ken, JP;
Tadahiko Kobayashi, Kanagawa-ken, JP;
Kohichi Tateyama, Chiba-ken, JP;
Hiromi Sakata, Kanagawa-ken, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
There is provided a magnetic recording apparatus capable of carrying out signal reproduction with high accuracy by using a narrow gap head structure corresponding to high recording density. An asymmetric gap structure MR head includes a magnetoresistance element,having a magnetoresistance film,and a pair of electrodes,disposed at the upper side; a reproducing magnetic gap film,disposed only at the lower side of the magnetoresistance element,; a magnetic shielding film,disposed so as to make a laminate with the magnetoresistance element,through the reproducing magnetic gap film,; and an insulating film,disposed at the upper side of the magnetoresistance element,. When a signal is read by use of such a reproducing head, the signal of the present bit is read by subtracting a value obtained by multiplying signals of a plurality of previous bits by predetermined coefficients from the present reproduction signal. As another reproduction signal processing system, a partial response system is adopted.