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:
May. 24, 2011
Filed:
Jul. 20, 2010
Kentarou Nakamura, Hachioji, JP;
Kohei Ota, Hachioji, JP;
Nobuyoshi Mori, Hachioji, JP;
Eiji Nomura, Hachioji, JP;
Kentarou Nakamura, Hachioji, JP;
Kohei Ota, Hachioji, JP;
Nobuyoshi Mori, Hachioji, JP;
Eiji Nomura, Hachioji, JP;
Konica Minolta Opto, Inc., Tokyo, JP;
Abstract
An optical pickup apparatus according to the present invention includes: a first light source for emitting a first light flux; a second light source for emitting a second light flux; a third light source for emitting-a third light flux; and an objective optical element. The objective optical element has an optical surface including at least two areas provided with optical path difference providing structures. The objective optical element converges the first to third light fluxes each passing through the predetermined areas on the objective optical element onto respective information recording surfaces of the first to third optical disks. The optical pickup apparatus provides a wavelength dependency of a spherical aberration so as to correct a change in a spherical aberration due to a refractive index change with a temperature change of the objective optical element.