发明授权
US07936658B2 Photodetector, diffraction grating, optical pickup and optical disc apparatus
有权
光电检测器，衍射光栅，光学拾取器和光盘装置
- 专利标题： Photodetector, diffraction grating, optical pickup and optical disc apparatus
- 专利标题（中）： 光电检测器，衍射光栅，光学拾取器和光盘装置
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申请号： US12709613申请日： 2010-02-22
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公开(公告)号： US07936658B2公开(公告)日： 2011-05-03
- 发明人: Tomoto Kawamura , Kunikazu Ohnishi , Masayuki Inoue , Katsuhiko Izumi
- 申请人： Tomoto Kawamura , Kunikazu Ohnishi , Masayuki Inoue , Katsuhiko Izumi
- 申请人地址： JP Iwate
- 专利权人： Hitachi Media Electronics Co., Ltd.
- 当前专利权人： Hitachi Media Electronics Co., Ltd.
- 当前专利权人地址： JP Iwate
- 代理机构： Antonelli, Terry, Stout & Kraus, LLP.
- 优先权： JP2005-213606 20050725; JP2006-044644 20060222
- 主分类号： G11B7/00
- IPC分类号： G11B7/00
摘要：
The present invention provides a photodetector capable of generating highly accurate tracking and focusing error signals free of variations in light quantity caused by interference, in an optical pickup with a two-wavelength multilaser. The photodetector comprises first three light receiving areas arranged linearly to receive three light beams respectively resulting from splitting of a light beam emitted from a laser light source of a first wavelength and second three light receiving areas arranged linearly to receive three light beams respectively resulting from splitting of a light beam emitted from a laser light source of a second wavelength longer than the first wavelength. The distance between both-end light receiving areas out of the first three light receiving areas is longer than the distance between both-end light receiving areas out of the second three light receiving areas.
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