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. 07, 2010
Filed:
Aug. 14, 2008
Kohji Miyake, Hiroshima, JP;
Kohji Miyake, Hiroshima, JP;
Sharp Kabushiki Kaisha, Osaka-shi, JP;
Abstract
An optical pickup includes a blue laser source; a red laser source; an infrared laser source; a blue light objective lens focusing blue light emitted from the blue laser source onto an optical storage medium; and a red and infrared light objective lens focusing red light emitted from the red laser source and infrared light emitted from the infrared laser source onto the optical storage medium. The optical pickup contains a blue light startup mirror separating the blue light from the red and infrared light. The blue light startup mirror is disposed along optical paths extending from the blue laser source, the red laser source, and the infrared laser source to the blue light objective lens and the red and infrared light objective lens. The optical pickup also contains a low blue light transmittance plane and low blue light reflectance plane along an optical branch path extending from the blue light startup mirror to the red and infrared light objective lens. The configuration greatly restrains the spilling of the blue light into the red and infrared light objective lens, preventing degradation of the red and infrared light objective lens.