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:
Jun. 09, 1987
Filed:
Jul. 22, 1982
Applicant:
Inventors:
Kenji Kanai, Osaka, JP;
Nobuyuki Kaminaka, Osaka, JP;
Noboru Nomura, Osaka, JP;
Yuuji Omata, Osaka, JP;
Assignee:
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
360126 ; 360110 ; 360123 ;
Abstract
A thin magnetic film is deposited over a nonmagnetic or piezoelectric substrate. When a shock wave is propagated through this substrate from its one end to the other end, the permeability of the thin magnetic film is locally increased and a portion or region having a high permeability also travels from one end to the other end of the thin magnetic film in unison with the shock wave. A magnetic core with a signal winding is disposed and magnetically coupled with the thin magnetic film. The signal can be recorded or reproduced while the recording medium is scanned.