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. 04, 2008
Filed:
Jan. 26, 2005
Yoshiaki Yamauchi, Minori, JP;
Hideyuki Onuma, Urayasu, JP;
Makoto Ibe, Hitachinaka, JP;
Shinya Tsubota, Mito, JP;
Kuniyuki Kimura, Fujisawa, JP;
Yoshiaki Yamauchi, Minori, JP;
Hideyuki Onuma, Urayasu, JP;
Makoto Ibe, Hitachinaka, JP;
Shinya Tsubota, Mito, JP;
Kuniyuki Kimura, Fujisawa, JP;
Hitachi, Ltd., Tokyo, JP;
Hitachi-LG Storage, Inc., Tokyo, JP;
Abstract
In an optical disk drive device, in order to reduce structural vibration noise and aerodynamic sound during high-speed revolution, a recess is formed at the deeper end. This recess is in a position axially symmetric to a hole for the movement of an optical head with respect to the axis of a spindle motor, and its size is substantially equal to that of the movement hole. This recess serves to suppress the vibration mode of a disk tray and the air flow between the disk and the disk tray. Noise is reduced even when the disk is turning at high speed.