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. 20, 1988
Filed:
Jan. 08, 1987
Tetsuo Kobayashi, Kanagawa, JP;
Yukihisa Tsukada, Odawara, JP;
Shinji Narishige, Mito, JP;
Shinichi Hara, Hitachi, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A first magnetic layer is formed upon a non-magnetic substrate, a gap layer is formed upon the first magnetic layer, a conductor coil covered with an insulation layer is formed upon the gap layer, a second magnetic layer is formed upon the gap layer and the insulation layer, a magnetic gap being formed between the first and second magnetic layers at a front portion facing a recording medium, and the second magnetic layer being connected to the first magnetic layer at a back portion. After forming a mask made of metal oxide upon the second magnetic layer, the second magnetic layer, the gap layer, and the first magnetic layer are formed into a predetermined shape respectively at the tip portion by dry etching. Thus, a high performance thin-film magnetic head having the same widths for the first and second magnetic layers is obtained.