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:
Feb. 14, 1989
Filed:
Mar. 20, 1987
Sony Corporation, Tokyo, JP;
Abstract
A magnetic erasing head comprises a pair of magnetic core elements defining an erasing magnetic gap therebetween and facing to a travelling magnetic recording medium, a coil winding opening provided adjacent to the erasing magnetic gap on one of the magnetic core elements located on a trailing side relative to travelling of the magnetic recording medium and defining a depth of the erasing magnetic gap, and a coil wound through the coil winding opening to be provided an alternating current flow for generating erasing magnetic field at the erasing gap, the coil winding opening defining a core portion adjacent to the trailing side having a thickness substantially equal to the depth of the erasing magnetic gap.