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. 03, 2007
Filed:
Aug. 26, 2003
Kiyono Ikenaka, Hino, JP;
Mitsuru Mimori, Kokubunji, JP;
Kiyono Ikenaka, Hino, JP;
Mitsuru Mimori, Kokubunji, JP;
Konica Corporation, Tokyo, JP;
Abstract
An optical pickup device, comprises light sources to emit a first light flux having a wavelength λ(380 nm<λ<450 nm); a second light flux having a wavelength λ(600 nm<λ<700 nm); and a light-converging optical system. The light-converging optical system converges the first light flux on a first optical information recording medium through a protective layer having a thickness tand the light-converging optical system converges the second light flux on a second optical information recording medium through a protective layer having a thickness t. The light-converging optical system forms a first spot on the information recording surface of the first optical information recording medium by using N-th order diffracted light ray generated, and the light-converging optical system forms a second spot on the information recording surface of the second optical information recording medium by using M-th order (M≠N) diffracted light ray generated.