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:
Apr. 06, 2004
Filed:
Jan. 28, 2002
Applicant:
Inventors:
Nobuyuki Kanto, Kawasaki, JP;
Goro Kawasaki, Kawasaki, JP;
Assignee:
Fujitsu Limited, Kawasaki, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B 7/00 ;
U.S. Cl.
CPC ...
G11B 7/00 ;
Abstract
An optical head includes a lens holder for carrying a biconvex lens and a plano-convex lens above a data storage disk. In data-writing or data-reading operation, the plano-convex lens comes closer to the storage disk than the biconvex lens. The plano-convex lens is accommodated in a through-hole formed in the lens holder. The lower opening of the through-hole is closed by a transparent plate attached to the bottom surface of the lens holder. The flat lens surface of the plano-convex lens is held in close contact with the transparent plate.