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:
Aug. 22, 2006
Filed:
Sep. 02, 2004
Keizo Miyata, Kyoto, JP;
Hiroshi Kohso, Osaka, JP;
Makoto Kimura, Osaka, JP;
Tatsuaki Ishida, Shiga, JP;
Keizo Miyata, Kyoto, JP;
Hiroshi Kohso, Osaka, JP;
Makoto Kimura, Osaka, JP;
Tatsuaki Ishida, Shiga, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A self-servo reference signal including a timing pattern and an oblique phase pattern is transferred in advance on a magnetic diskby magnetic printing. A phase difference detection sectiondetects a phase difference between the two patterns to detect the position of a magnetic head. A burst signal generated by a record signal generation sectionis recorded in a region of the magnetic diskwhere no self-servo reference signal is recorded. A track pitch calculation sectiondetermines a relationship between the reproduction output of the burst signal detected by a reproduction signal processing sectionand the phase difference detected by the phase difference detection section, thus calculating an optimum data track pitch.