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:
Jan. 03, 2012
Filed:
Apr. 18, 2007
Yukiko Hamano, Kanagawa, JP;
Hideaki Hirai, Kanagawa, JP;
Yukiko Hamano, Kanagawa, JP;
Hideaki Hirai, Kanagawa, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A disclosed optical pickup for performing at least recording, reproduction, or deletion of information on a first, second, third, and fourth optical recording media having different recording densities includes a first light source configured to emit first light having a first wavelength λcorresponding to the first and second optical recording media; a second light source configured to emit second light having a second wavelength λcorresponding to the third optical recording medium; a third light source configured to emit third light having a third wavelength λcorresponding to the fourth optical recording medium; an objective lens configured to focus the first light, the second light, and the third light on corresponding recording surfaces of the first, second, third, and fourth optical recording media; and an aberration correcting unit between the objective lens and the first, second, and third light sources.