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. 12, 1992
Filed:
Aug. 21, 1991
Applicant:
Inventors:
Assignee:
Sony Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
360126 ; 360123 ;
Abstract
A thin film magnetic head which includes a substrate of magnetic or nonmagnetic material, an upper magnetic film on the substrate, a coil conductor on the substrate, and a lower magnetic film on the substrate, the lower magnetic film having a groove formed therein for receiving the coil conductor therein. In the preferred form of the present invention, the thickness of the lower magnetic film is at least 0.3 times the thickness of the upper magnetic film when the substrate is composed of a magnetic material and at least 0.8 times the thickness of the upper magnetic film when the substrate is composed of a nonmagnetic material.