Invention Grant
- Patent Title: Optical pickup apparatus
- Patent Title (中): 光拾取装置
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Application No.: US11496814Application Date: 2006-07-31
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Publication No.: US07684306B2Publication Date: 2010-03-23
- Inventor: Kazunori Matsubara , Shinzoh Murakami , Tetsuo Ueyama , Kazuhiro Tsuchida , Yukio Watanabe , Osamu Miyazaki
- Applicant: Kazunori Matsubara , Shinzoh Murakami , Tetsuo Ueyama , Kazuhiro Tsuchida , Yukio Watanabe , Osamu Miyazaki
- Applicant Address: JP Osaka
- Assignee: Sharp Kabushiki Kaisha
- Current Assignee: Sharp Kabushiki Kaisha
- Current Assignee Address: JP Osaka
- Agency: Morrison & Foerster LLP
- Priority: JP2005-221747 20050729; JP2005-326504 20051110; JP2006-170726 20060620; JP2006-202513 20060725
- Main IPC: G11B7/00
- IPC: G11B7/00

Abstract:
There is provided an optical pickup apparatus that can obtain a stable servo signal by reducing stray light generated by diffraction in a recording layer other than a recording layer on which light is condensed. A hologram element provided in an optical pickup apparatus for recording information onto a recording medium and/or reproducing information on the recording medium by use of light includes fourth and fifth divisions where at least first-order diffracted light among diffracted light beams obtained by reflection and diffraction on a recording layer other than a light-condensed recording layer on which light is condensed by an objective lens so as not to be directed toward first and second light-receiving elements for detecting focus position information and third to eighth light-receiving elements for detecting track position information.
Public/Granted literature
- US20070025228A1 Optical pickup apparatus Public/Granted day:2007-02-01
Information query
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