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:
Aug. 22, 2000
Filed:
May. 19, 1999
Applicant:
Inventors:
Kazuo Hirose, Yokkaichi, JP;
Takashi Minami, Kuwana, JP;
Fuminori Satoji, Yokkaichi, JP;
Takaaki Kawakami, Yokohama, JP;
Assignee:
NTN Corporation, Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B / ;
U.S. Cl.
CPC ...
359819 ; 359811 ; 359813 ; 359814 ; 359823 ;
Abstract
An optical pick-up comprising a supporting shaft and a lens holder having a bearing part which fits on the supporting shaft rotatably. At least one of the supporting shaft and the bearing part is formed of ceramics containing zirconia. The optical pick-up allows a lens to be supported at high dimensional accuracy for a high-density recording medium and suppresses resonance for a high-speed access to a disc.