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:
Sep. 28, 2010
Filed:
Dec. 28, 2001
Hiroyuki Ota, Kyoto, JP;
Haruhiko Fujisawa, Kyoto, JP;
Naoki Mukai, Takatsuki, JP;
Satoru Fukiage, Ueno, JP;
Kenji Sano, Nagaokakyo, JP;
Shigeo Fujitani, Osaka, JP;
Hiroyuki Ota, Kyoto, JP;
Haruhiko Fujisawa, Kyoto, JP;
Naoki Mukai, Takatsuki, JP;
Satoru Fukiage, Ueno, JP;
Kenji Sano, Nagaokakyo, JP;
Shigeo Fujitani, Osaka, JP;
Hitachi Maxell, Ltd., Ibaraki-shi, Osaka, JP;
Abstract
A magnetic tape which comprises a nonmagnetic support, a magnetic layer which is formed on one surface of the nonmagnetic support, and a backcoat layer which comprises a binder and nonmagnetic powder containing carbon black as a component and which is formed on the other surface of the nonmagnetic support, having pits for optical servo formed thereon, characterized in that the average of the reflectance on the flat portion of the backcoat layer is 8.5% or higher, and that the maximum rate of fluctuation of the reflectance on the flat portion, depending on a position of the magnetic tape:[Maximum of absolute value of (Reflectance−Average reflectance)]×100/(Average reflectance)is 10% or lower. This magnetic tape is high in the initial S/N of the servo signal, and also high in the S/N of the servo signal found after the magnetic tape is run twice.