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:
Jul. 28, 2009
Filed:
Mar. 01, 2007
Toshimasa Kamisada, Yokohama, JP;
Yasuo Kitada, Odawara, JP;
Kazuyoshi Yamazaki, Kawasaki, JP;
Tomoto Kawamura, Tokyo, JP;
Yoshiro Konishi, Yokohama, JP;
Toshimasa Kamisada, Yokohama, JP;
Yasuo Kitada, Odawara, JP;
Kazuyoshi Yamazaki, Kawasaki, JP;
Tomoto Kawamura, Tokyo, JP;
Yoshiro Konishi, Yokohama, JP;
Hitachi Media Electronics Co., Ltd., Iwate, JP;
Abstract
An optical pickup apparatus is provided with a dividing element having a plurality of regions. The dividing element is capable of dividing a light flux reflected by the optical disc into a plurality of light fluxes having different outgoing directions. Each region of the dividing element and light receiving parts of a light detector are structured such that when a target information recording layer of the optical disc is brought into focus, a light flux reflected from the target information recording layer is focused on the light receiving parts of the light detector, and a light flux reflected from other information recording layer than the target information recording layer is not irradiated onto the light receiving parts of the light detector.