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. 27, 2011
Filed:
Dec. 01, 2009
Yuichi Takahashi, Nara, JP;
Fumitake Sakai, Osaka, JP;
Yukio Hibino, Osaka, JP;
Koichi Muramatsu, Osaka, JP;
Kazuo Momoo, Osaka, JP;
Yuichi Takahashi, Nara, JP;
Fumitake Sakai, Osaka, JP;
Yukio Hibino, Osaka, JP;
Koichi Muramatsu, Osaka, JP;
Kazuo Momoo, Osaka, JP;
Panasonic Corporation, Osaka, JP;
Abstract
An optical pickup device according to the present invention comprises: a first mirror for reflecting a first light beam outputted from a first light source and letting a second light beam outputted from a second light source pass therethrough; a first object lens for converging the first light beam reflected by the first mirror on an information recording surface of a recording medium; a second mirror for reflecting the second light beam passing through the first mirror; a second object lens for converging the second light beam reflected by the second mirror on the information recording surface of the recording medium; and an achromatic lens for correcting an axial chromatic aberration of the second object lens generated by wavelength variation of the second light beam, wherein the achromatic lens is provided in an optical path between the first mirror and the second mirror.