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:
Aug. 15, 1989
Filed:
Aug. 10, 1987
Kiyonori Hayakawa, Ebina, JP;
Akio Mishima, Ayase, JP;
Sony Corporation, Tokyo, JP;
Abstract
A complex magnetic transducer head with a single magnetic pole includes a recording and reproducing main magnetic pole made of a thin film of soft magnetic material with a predetermined width and in contact with a magnetic recording medium. A non-magnetic guard member is adjacent each side of the recording and reproducing main magnetic pole and a magnetic core portion is integrated with each guard member. Grooves are formed in the magnetic core portion for separating a first auxiliary magnetic pole portion in contact with the recording and reproducing main magnetic pole from a magnetic flux return path portion. The winding is wound around the recording reproducing main magnetic pole through the grooves. An erasing head portion having a pair of erasing main magnetic poles faces the magnetic record medium and is spaced from the recording and reproducing main magnetic pole by a predetermined distance along the running direction of the magnetic record medium, and the pair of erasing main magnetic poles are spaced apart in a direction transverse to the running direction by a distance smaller than the width of the recording and reproducing main magnetic pole. A erasing winding is provided for exciting the erasing main magnetic poles. Previously recorded data on the magnetic record medium is erased, despite small displacements which may occur between the previously recorded track on the magnetic record medium and the recording and reproducing main magnetic pole.