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:
Feb. 28, 2012
Filed:
Feb. 03, 2011
Yasuo Ueda, Osaka, JP;
Yoshiyuki Hashimoto, Osaka, JP;
Noriaki Terahara, Osaka, JP;
Toshiaki Takasu, Osaka, JP;
Toshiyasu Tanaka, Osaka, JP;
Yasuo Ueda, Osaka, JP;
Yoshiyuki Hashimoto, Osaka, JP;
Noriaki Terahara, Osaka, JP;
Toshiaki Takasu, Osaka, JP;
Toshiyasu Tanaka, Osaka, JP;
Panasonic Corporation, Osaka, JP;
Abstract
An optical pickup device has a DVD/CD laser diode for emitting a DVD/CD laser beam as linear polarized light, and a BD laser diode for emitting a BD laser beam. The optical pickup device has a dichroic mirror that regularly reflects a part of the DVD/CD laser beam, transmits a part of the DVD/CD laser beam, and transmits return light of the BD laser beam. The dichroic mirror is formed so that a product of reflectance of outward light of the DVD/CD laser beam and transmittance of return light of the DVD/CD laser beam becomes 20% or more to 25% or less. A light receiving element receives the return light of the DVD/CD laser beam transmitted through the dichroic mirror or the return light of the BD laser beam transmitted through the dichroic mirror.