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:
Apr. 17, 1984
Filed:
Oct. 23, 1981
Takeshi Sawada, Yokohama, JP;
Ko Yoneda, Kawasaki, JP;
Akira Shinmi, Kawasaki, JP;
Hiroshi Takagi, Kawasaki, JP;
Shuzo Abiko, Chichibu, JP;
Hirokazu Goto, Tokyo, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Canon Denshi Kabushiki Kaisha, Saitama, JP;
Abstract
The present invention is directed to improvements in a perpendicular magnetic recording-reproducing head. One of the improvements comprises the use of a magneto-resistive effect element to form the main pole of the magnetic head. This feature of the invention enables a stable and faithful reproduction of information recorded in a magnetic recording medium up to the shortest wavelength and to obtain a sufficiently large reproducing output signal. Another improvement comprises the use of such magneto-resistive effect elements in layers. The multilayer structure permits production of a large reproducing output and also an optimum S/N ratio even if the width of track is small.