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. 17, 2012
Filed:
Jan. 05, 2009
Masayuki Hata, Kadoma, JP;
Yasuyuki Bessho, Uji, JP;
Yasuhiko Nomura, Moriguchi, JP;
Masayuki Shono, Hirakata, JP;
Kenji Nagatomi, Kaizu, JP;
Yoichi Tsuchiya, Hashima, JP;
Masayuki Hata, Kadoma, JP;
Yasuyuki Bessho, Uji, JP;
Yasuhiko Nomura, Moriguchi, JP;
Masayuki Shono, Hirakata, JP;
Kenji Nagatomi, Kaizu, JP;
Yoichi Tsuchiya, Hashima, JP;
Sanyo Electric Co., Ltd., Osaka, JP;
Abstract
A monolithic red/infrared semiconductor laser device is joined to a blue-violet semiconductor laser device. The distance between a blue-violet emission point in the blue-violet semiconductor laser device and an infrared emission point in an infrared semiconductor laser device is significantly shorter than the distance between a red emission point in a red semiconductor laser device and the infrared emission point. A blue-violet laser beam, a red laser beam, and an infrared laser beam respectively emitted from the blue-violet emission point, the red emission point, and the infrared emission point are introduced into a photodetector after being incident on an optical disk by an optical system comprising a polarizing beam splitter, a collimator lens, a beam expander, a λ/4 plate, an objective lens, a cylindrical lens, and an optical axis correction element.