Invention Grant
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
- Patent Title: Optical element having aberration correction and optical pickup and optical information recording and/or reproducing apparatus equipped therewith
- Patent Title (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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Application No.: US10588844Application Date: 2005-01-14
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Publication No.: US07852736B2Publication Date: 2010-12-14
- Inventor: Katsuhiro Koike
- Applicant: Katsuhiro Koike
- Applicant Address: JP Tokyo
- Assignee: Pioneer Corporation
- Current Assignee: Pioneer Corporation
- Current Assignee Address: JP Tokyo
- Agency: Nixon & Vanderhye PC
- Priority: JP2004-032050 20040209
- International Application: PCT/JP2005/000356 WO 20050114
- International Announcement: WO2005/076266 WO 20050818
- Main IPC: G11B7/135
- IPC: G11B7/135
Abstract:
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.
Public/Granted literature
- US20070183296A1 Optical element, optical pickup, and information recording/reproduction apparatus Public/Granted day:2007-08-09
Information query
IPC分类:
