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. 24, 2006
Filed:
Aug. 20, 2002
Katsuya Sakamoto, Hachioji, JP;
Kohei Ota, Hachioji, JP;
Yuichi Atarashi, Hachioji, JP;
Konica Corporation, Tokyo, JP;
Abstract
An objective lens for use in an optical pickup apparatus has a diffractive optical surface. A first light flux having a first wavelength of λis converged as a first number diffraction order diffracted-ray other than the zero-th order diffracted-ray onto an information recording plane of the first optical information recording medium having a thinner protective substrate tby the diffractive optical surface and a second light flux having a second wavelength of λ(λ) is converged as a second number diffraction order diffracted-ray other than the zero-th order diffracted-ray onto the information recording plane of the second optical information recording medium having a thicker protective substrate t(tt) by the diffractive optical surface. The second number diffraction order is different from the first number diffraction order.