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:
Jun. 28, 2011
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
A servo objective lens and a recording/reproducing objective lens are commonly held on a holder. The servo objective lens and the recording/reproducing objective lens are integrally displaced, thereby pulling servo light onto a servo layer. Upon the pulling, focus positions of recording light and reproducing light follow a focus position of the servo light. As a result, the focus positions of recording light and reproducing light are set close to the servo layer. Thereafter, an optical element for displacing the focus positions of recording light and reproducing light in the optical axis direction is driven to pull the recording light and the reproducing light onto a targeted recording layer.