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. 09, 2007
Filed:
Apr. 14, 2004
Norikazu Arai, Tokyo, JP;
Shinichiro Saito, Tokyo, JP;
Norikazu Arai, Tokyo, JP;
Shinichiro Saito, Tokyo, JP;
Konica Minolta Opto, Inc., Tokyo, JP;
Abstract
An objective optical element to be used for an optical pickup device for performing reproducing and/or recording of information to a first optical information recording medium and a second optical information recording medium by converging a light beam having a wavelength λ(640 nm≦λ1≦670 nm) on the first optical information recording medium having a protective substrate thickness tand by converging a light beam having a wavelength λ(400 nm≦λ2≦415 nm) on the second optical information recording medium having a protective substrate thickness twherein an optical system magnification msatisfies a relation of |m|<0.01, and wherein an optical system magnification msatisfies a relation of |m|<0.01.