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:
Jan. 06, 2009
Filed:
Nov. 06, 2003
Applicants:
Takehiko Hamaguchi, Odawara, JP;
Hideaki Maeda, Odawara, JP;
Kazuhisa Shishida, Odawara, JP;
Yasutaka Nishida, Kodaira, JP;
Inventors:
Takehiko Hamaguchi, Odawara, JP;
Hideaki Maeda, Odawara, JP;
Kazuhisa Shishida, Odawara, JP;
Yasutaka Nishida, Kodaira, JP;
Assignee:
Hitachi Global Storage Technologies Japan, Ltd., Kanagawa-ken, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11B 5/596 (2006.01);
U.S. Cl.
CPC ...
Abstract
The invention provides a servo pattern that is stable for long time, easily writable, and excellent in S/N. DC-signal area included in a burst area of a servo pattern comprises combination of positive and negative DC-signals, low-density dummy bit, or pattern having phases that are deviated each other so that the sum of magnetization of the burst area of the servo pattern is equalized to 0.