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:
Jun. 14, 2011
Filed:
Oct. 19, 2007
Norikazu Arai, Hachioji, JP;
Toshiyuki Kojima, Hachioji, JP;
Toshihiko Kiriki, Hachioji, JP;
Kohei Ota, Hachioji, JP;
Shinichiro Saito, Hachioji, JP;
Norikazu Arai, Hachioji, JP;
Toshiyuki Kojima, Hachioji, JP;
Toshihiko Kiriki, Hachioji, JP;
Kohei Ota, Hachioji, JP;
Shinichiro Saito, Hachioji, JP;
Konica Corporation, Tokyo, JP;
Abstract
An optical pickup apparatus for reproducing information from an optical information recording medium or for recording information onto an optical information recording medium, is provided with a first light source for emitting first light flux having a first wavelength; a second light source for emitting second light flux having a second wavelength, the first wavelength being different from the second wavelength; a converging optical system having an optical axis and a diffractive portion, and a photo detector; wherein in case that the first light flux passes through the diffractive portion to generate at least one diffracted ray, an amount of n-th ordered diffracted ray of the first light flux is greater than that of any other ordered diffracted ray of the first light flux, and in case that the second light flux passes through the diffractive portion to generate at least one diffracted ray, an amount of n-th ordered diffracted ray of the second light flux is greater than that of any other ordered diffracted ray of the second light flux, where n stands for an integer other than zero.