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. 04, 1998
Filed:
Aug. 23, 1996
Hiromi Juso, Gose, JP;
Makoto Iwasawa, Sakai, JP;
Hiroshi Koide, Yamato, JP;
Tetsuo Kanno, Ebina, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
An optical pickup unit is formed such that a portion on an upstream side of the air flow has a streamline shape or similar shape to the streamline shape so as to keep the air flow generated with high speed rotations of a disc-shaped recording medium away from a vicinity of an objective lens. According to this arrangement, dust contained in the air flow can be prevented from adhering to the surface of the objective lens. Moreover, the dust will not enter inside the optical pickup unit through a small clearance between a lens holder of the objective lens and a cover for the optical pickup unit.