Invention Grant
US07940630B2 Optical pick up apparatus with a single beam system and having a diffraction grating
有权
具有单光束系统并具有衍射光栅的光学拾取装置
- Patent Title: Optical pick up apparatus with a single beam system and having a diffraction grating
- Patent Title (中): 具有单光束系统并具有衍射光栅的光学拾取装置
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Application No.: US11979130Application Date: 2007-10-31
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Publication No.: US07940630B2Publication Date: 2011-05-10
- Inventor: Toshimasa Kamisada , Yasuo Kitada , Kazuyoshi Yamazaki , Tomoto Kawamura , Yoshiro Konishi
- Applicant: Toshimasa Kamisada , Yasuo Kitada , Kazuyoshi Yamazaki , Tomoto Kawamura , Yoshiro Konishi
- Applicant Address: JP Iwate
- Assignee: Hitachi Media Electronics Co., Ltd.
- Current Assignee: Hitachi Media Electronics Co., Ltd.
- Current Assignee Address: JP Iwate
- Agency: Antonelli, Terry, Stout & Kraus, LLP.
- Priority: JP2006-283245 20061018; JP2006-283248 20061018
- Main IPC: G11B7/135
- IPC: G11B7/135
Abstract:
An optical pickup apparatus includes a semiconductor laser for emitting a laser light, an objective lens for irradiating the light flux emitted from the semiconductor laser onto an optical disc, and a light detector for receiving the light flux reflected from the optical disc. The light detector has a light receiving part that comprises five regions of a region 1, a region 2, a region 3, a region 4 and a region 5.
Public/Granted literature
- US20080094951A1 Optical pickup apparatus and optical disc apparatus using same Public/Granted day:2008-04-24
Information query
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