发明名称 |
Optical pickup |
摘要 |
The present invention relates to an optical pickup having a constant numerical aperture even if spherical aberration is compensated for. The optical pickup is used in an information recording and/or reproducing machine. The information recording and/or reproducing machine records and/or reproduces information in a recording medium upon radiation of a light beam from a light source. The optical pickup includes a condensing optical system for condensing the light beam from the light source onto a recording layer of the recording medium. The condensing optical system includes an object lens. The condensing optical system also includes an aperture positioned about a focal length of the object lens apart from a position of a principal incidence plane of the object lens toward the light source along an optical axis of the condensing optical system.
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申请公布号 |
US6594091(B2) |
申请公布日期 |
2003.07.15 |
申请号 |
US20010999195 |
申请日期 |
2001.12.03 |
申请人 |
PIONEER CORPORATION |
发明人 |
MAEDA TAKANORI;KIKUCHI IKUYA;KOIKE KATSUHIRO;SATO MAKOTO |
分类号 |
G02B7/02;G02B13/00;G02B27/00;G11B7/125;G11B7/135;(IPC1-7):G02B13/18;G02B3/02 |
主分类号 |
G02B7/02 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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