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:
May. 27, 1980
Filed:
Jun. 06, 1978
Applicant:
Inventors:
Fumio Tanaka, Chichibu, JP;
Naohiko Toshimitsu, Chichibu, JP;
Assignees:
Canon Kabushiki Kaisha, Tokyo, JP;
Canon Denshi Kabushiki Kaisha, Chichibu, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ; G11B / ; G11B / ;
U.S. Cl.
CPC ...
360118 ; 360 66 ;
Abstract
An erasing head is improved with respect to its erasing ratio as well as its distortion ratio. The erasing head has at least two gap portions one of which is so designed as to apply a high erasing magnetic field sufficient to completely erase information recorded on the tape. The other gap portion is so designed as to apply a magnetic field just intense enough to minimize the distortion ratio.