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:
Oct. 22, 1996
Filed:
Oct. 25, 1990
Kyo Akagi, Fuchu, JP;
Masaaki Futamoto, Kanagawa-ken, JP;
Fumio Kugiya, Hachioji, JP;
Yoshinori Miyamura, Tokyo, JP;
Hisashi Takano, Hachioji, JP;
Yoshibumi Matsuda, Hachioji, JP;
Mikio Suzuki, Kokubunji, JP;
Takeshi Nakao, Sagamihara, JP;
Takayuki Munemoto, Ibaraki-ken, JP;
Hirotsugu Fukuoka, Hitachiota, JP;
Makoto Aihara, Katsuta, JP;
Tokuho Takagaki, Yokohama, JP;
Hajime Aoi, Tachikawa, JP;
Yosuke Seo, Sagamihara, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A method and device of head positioning in an information recording/reading device in which a magnetic recording medium with data tracks for recording information thereon is provided and a magnetic head is positioned on the data track to record/read out the information, wherein a data signal is recorded in the data recording layer of said recording medium, a servo signal is recorded in the servo signal recording layer located below said data signal recording layer, said data signal is read out using a data magnetic head whereas said servo signal is read out using a servo magnetic head, and the frequency of said servo signal is within the range of the gap-null frequency of said data magnetic head whereas the frequency of said data signal is within the range of the gap-null frequency of said servo magnetic head, and said magnetic head is positioned on the data track on the basis of said servo signal. A method and device of head positioning in an information recording/reading device in which a magnetic recording medium with data tracks for recording information thereon is provided and a magnetic head is positioned on the data track to record/read out the information, wherein the data tracks are discrete tracks in which adjacent data tracks are separated by a groove located therebetween, a data signal is recorded on the data track of said recording medium, a servo signal is recorded on the servo tracks of grooves between said adjacent data tracks, and said magnetic head is positioned on the data track on the basis of said servo signal.