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:
Oct. 05, 1999
Filed:
Sep. 10, 1998
Motoji Egawa, Asabo-cho, JP;
Kazutoshi Takayanagi, Asabo-cho, JP;
Minebea Co., Ltd., Miyota, JP;
Abstract
To provide a magnetic head and a method for producing the same with a high dimension precision and a good shield effect, a cutaway 35 is formed by applying a machining process to a closure member 22, and first, second and third ribs 31, 32 and 33 of a back yoke base member 30 formed by molding, thereby obtaining a back yoke. A width of the first, second and third ribs 31, 32 and 33 is made large. There is no fear that the deformation or warpage would occur due to molding or sintering. As a result, it is possible to increase a height of first, second and third leg portions 19, 20 and 21. It is therefore possible to increase the desired reproduction output by increasing the number of turns of coils. It is possible to dispense with a gap formed on a bottom side of the back yoke, that has been required for extracting lead lines in the conventional manner. It is possible to simplify the shape of the back yoke not only to enhance the dimension precision but also to restrict the inflow of the magnetic field through the gap formed on the bottom side from the outside to thereby reduce the adverse affect of the external magnetic field.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile