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:
Dec. 21, 2010
Filed:
Jul. 21, 2006
Kiyono Ikenaka, Hino, JP;
Yuichi Atarashi, Hachioji, JP;
Kiyono Ikenaka, Hino, JP;
Yuichi Atarashi, Hachioji, JP;
Konica Corporation, Tokyo, JP;
Abstract
An optical pickup apparatus comprises first, second and third light sources to emit light fluxes of wavelength λand λfor conducting recording and/or reproducing information for first, second and third optical information recording mediums having respective protective substrates of thickness t, tand tand a diffractive optical element located on a common optical path for the first, second and third light sources. A converged-light spot is formed on the first optical information recording medium with m-th order diffracted-light ray of the wavelength λ, on the second optical information recording medium with n-th order diffracted-light ray of the wavelength λ, and on the third optical information recording medium with k-th order diffracted-light ray of the wavelength λgenerated by the diffractive optical element respectively, wherein one of m, n and k is different from one of other two numbers.