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:
Mar. 06, 2001
Filed:
Sep. 17, 1997
Takashi Kouno, Ibaraki-ken, JP;
Yoshihiro Sato, Ibaraki-ken, JP;
Yoshiaki Yamauchi, Ibaraki-ken, JP;
Shozo Saegusa, Ibaraki-ken, JP;
Shigeki Mori, Yokohama, JP;
Shinobu Yoshida, Tsuchiura, JP;
Hisahiro Miki, Hitachinaka, JP;
Kuniyuki Kimura, Chigasaki, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A disc device which includes a rotary drive mechanism for rotating a replaceable recording medium. An unbalance correcting mechanism adapted to correct unbalance is incorporated in a rotary body rotating unit in the rotary drive mechanism, and includes a holding system having a holding member for holding the rotary drive mechanism and a head having at least a reproducing function. Further included is a support member composed of resilient members, for supporting a casing and a unit holder to each other. The holding system has a natural frequency higher than 30 Hz but lower than 70 Hz, and exhibits a transmission characteristic having a lift-up degree of higher than 8 dB at a resonant point.