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. 01, 2007
Filed:
Aug. 13, 2002
Ken Yoshimura, Kyoto, JP;
Tsugihiro Doi, Osaka, JP;
Ken Yoshimura, Kyoto, JP;
Tsugihiro Doi, Osaka, JP;
Hitachi Maxell, Ltd., Osaka, JP;
Abstract
There is provided a magnetic tape, to be used at a running speed of at least 4,000 mm/sec., wherein servo signals for controlling tracking are recorded on the magnetic layer or the backcoat layer, and wherein the difference between the recording track width and the reproducing track width is 16 μm or less, characterized in that the value of [α/(Tw−Tr)] is 0.2 or less, wherein a [μm] is an amount of a weave occurring on one of both edges of the magnetic tape and on the side of reference for the running of the tape; Tw [μm] is a recording track width; and Tr [μm] is a reproducing track width; and that a coefficient of humidity expansion in the tape widthwise direction is (0 to 14)×10/% RH; and a coefficient of thermal expansion in the tape widthwise direction is (0 to 10)×10/° C. This magnetic tape has a recording track width of 28 μm or less, and is excellent in servo performance, since a decrease in reproduction output due to off-track hardly occurs even when the difference between the recording track width and the reproducing track width is 16 μm or less.