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. 02, 1987
Filed:
Feb. 01, 1984
Applicant:
Inventors:
Tokihiko Ogura, Kanagawa, JP;
Shigeru Hashimoto, Tokyo, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
360 66 ;
Abstract
The disclosed erasing apparatus is capable of erasing a signal recorded on a magnetic recording medium from individual recording tracks one by one over an erasing width wider than the width of each recording track. A magnetic head receives an erasing signal from a generating circuit that generates an erasing signal including a sustained oscillation of low frequency outside of the frequency band of a recorded or reproduced signal and a subsequent attenuating oscillation of a frequency higher than the frequency of the sustained oscillation.