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:
Jun. 28, 1994
Filed:
Feb. 28, 1992
Hisashi Takano, Kodaira, JP;
Kyo Akagi, Fuchu, JP;
Mikio Suzuki, Kokubunji, JP;
Yoshibumi Matsuda, Hachiouji, JP;
Takeshi Nakao, Sagamihara, JP;
Yoshinori Miyamura, Nishitama, JP;
Fumio Kugiya, Hachiouji, JP;
Masaaki Futamoto, Tsukui, JP;
Hideki Sawaguchi, Kodaira, JP;
Nobuyuki Inaba, Hasuda, JP;
Takayuki Munemoto, Niihari, JP;
Kenji Mori, Tsuchiura, JP;
Hirotsugu Fukuoka, Hitachioota, JP;
Tokuho Takagaki, Odawara, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A magnetic recording data storage system includes a magnetic recording medium having pits formed therein, the pits defining recording tracks on the magnetic recording medium and being arranged in a staggered manner relative to respective center lines of the recording tracks, a magnetic head including an inductive element for recording data on the recording tracks and a magnetoresistive element for reproducing data from the recording tracks, one of (1) a unit for magnetically producing a signal from the pits, and (2) an optical unit for optically producing a signal from the pits, the optical unit including a laser for illuminating the pits, servo means for positioning the head on the recording tracks based on the signal produced from the pits, the servo means including a dual-stage actuator including a rough movement portion and a fine movement portion.