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:
Aug. 07, 2012
Filed:
Aug. 14, 2009
Morio Nakatani, Ichinomiya, JP;
Kenji Nagatomi, Kaizu, JP;
Yoshiyuki Matsumura, Anpachi-Gun, JP;
Seiichiro Takahashi, Gifu, JP;
Morio Nakatani, Ichinomiya, JP;
Kenji Nagatomi, Kaizu, JP;
Yoshiyuki Matsumura, Anpachi-Gun, JP;
Seiichiro Takahashi, Gifu, JP;
Sanyo Electric Co., Ltd., Osaka, JP;
Abstract
An optical pickup device includes: a first light source for emitting recording laser light; a second light source for emitting reproducing laser light having a wavelength different from a wavelength of the recording laser light; an objective lens for converging the recording laser light and the reproducing laser light. A quarter wavelength plate is disposed between the first light source and the second light source, and the objective lens. A wavelength-selective polarized beam splitter is disposed between the quarter wavelength plate, and the first light source and the second light source. The reproducing laser light alone out of the recording laser light and the reproducing laser light reflected on recording medium is guided to a photodetector.