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:
Jul. 17, 2007
Filed:
Mar. 16, 2004
Sadayuki Shoudai, Tokyo, JP;
Tsutomu Kikuchi, Tokyo, JP;
Sadayuki Shoudai, Tokyo, JP;
Tsutomu Kikuchi, Tokyo, JP;
TDK Corporation, Tokyo, JP;
Abstract
A method for manufacturing a magnetic tape includes a step of setting a cutting start angle between the disk-like upper blade and the disk-like lower blade overlapping each other and rotating in opposite directions at the time that cutting of the broad magnetic tape fed to a portion between the upper blade and the lower blade by the upper blade and the lower blade is started so that a position where an irregular raised and depressed pattern of a cut surface of the support on the side of the upper blade to be formed becomes locally maximal or a position where an irregular raised and depressed pattern of a cut surface of the support on the side of the lower blade becomes locally maximal satisfies 40≦100BU/T≦70 or 40≦100BL/T≦70, where BU is the distance from the surface of the back coat layer to the position where the irregular raised and depressed pattern of the cut surface of the support on the side of the upper blade becomes locally maximal, BL is the distance from the surface of the back coat layer to the position where the irregular raised and depressed pattern of the cut surface of the support on the side of the lower blade becomes locally maximal and T is the total thickness of the broad magnetic tape, and cutting the broad magnetic tape, thereby manufacturing the magnetic tape.