发明授权
US07852736B2 Optical element having aberration correction and optical pickup and optical information recording and/or reproducing apparatus equipped therewith
失效
具有像差校正的光学元件和配备有光学拾取器和光学信息记录和/或再现装置的光学元件
- 专利标题： Optical element having aberration correction and optical pickup and optical information recording and/or reproducing apparatus equipped therewith
- 专利标题（中）： 具有像差校正的光学元件和配备有光学拾取器和光学信息记录和/或再现装置的光学元件
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申请号： US10588844申请日： 2005-01-14
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公开(公告)号： US07852736B2公开(公告)日： 2010-12-14
- 发明人: Katsuhiro Koike
- 申请人： Katsuhiro Koike
- 申请人地址： JP Tokyo
- 专利权人： Pioneer Corporation
- 当前专利权人： Pioneer Corporation
- 当前专利权人地址： JP Tokyo
- 代理机构： Nixon & Vanderhye PC
- 优先权： JP2004-032050 20040209
- 国际申请： PCT/JP2005/000356 WO 20050114
- 国际公布： WO2005/076266 WO 20050818
- 主分类号： G11B7/135
- IPC分类号： G11B7/135
摘要：
An optical element (10) includes a spherical aberration correction hologram (14) and a color aberration correction hologram (15). For a first laser light requiring the greatest valid diameter, no affect is given to the wave front in either of the aberration correction holograms. However, for a second laser light requiring the second greatest valid diameter, the valid diameter is narrowed down by the spherical aberration correction hologram (14). For a third laser light requiring the smallest valid diameter, the valid diameter is narrowed down to a predetermined amount by the diffusion light coming and the spherical aberration correction hologram (14) and further the valid diameter is narrowed down by the selective diffraction of the light flux incident in the annular area B of the color aberration correction hologram (15) and its diffusion.
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