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:
Oct. 17, 2006
Filed:
Jun. 10, 2005
Applicant:
Minoru Sekine, Yokohama, JP;
Inventor:
Minoru Sekine, Yokohama, JP;
Assignee:
Asahi Glass Company, Limited, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
G02B 3/02 (2006.01); G11B 7/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
An objective lens capable of recording or reproducing informations of HD, DVD and CD is provided. A reference lensand a close-contact lensare closely in contact and bonded, the material of the close-contact lensis different from the material of the reference lens, a lens surface of the reference lens and a lens surface of the close-contact lens have aspherical shapes, the reference lens has a light-converging function, and the close-contact lens has a region providing a positive refractive power and a region providing a negative refractive power to construct an objective lens for optical information recording media.