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:
May. 19, 2009
Filed:
Jan. 25, 2005
Yoshiaki Yamauchi, Minori, JP;
Keiji Sasao, Kasumigaura, JP;
Ikuo Nishida, Ebina, JP;
Hisahiro Miki, Chigasaki, JP;
Kouhei Takita, Mitaka, JP;
Yoshiaki Yamauchi, Minori, JP;
Keiji Sasao, Kasumigaura, JP;
Ikuo Nishida, Ebina, JP;
Hisahiro Miki, Chigasaki, JP;
Kouhei Takita, Mitaka, JP;
Hitachi, Ltd., Tokyo, JP;
Hitachi-LG Data Storage, Inc., Tokyo, JP;
Abstract
A disc drive unit capable of preventing occurrence of errors in a recording system such as a CD or a DVD, using an optical head for recording data on a disc or reproducing data recorded on the disc. A disc tray is adapted to accommodate the disc, and load and unload the disc. A top cover is arranged above the disc. The top cover is formed therein with a concave and convex part for avoiding positioning a node of each of vibration modes (0, n) (where n=2, 3, 4) caused by a critical rotating speed of the disc, at a position right above the optical head.