发明名称 |
Objective lens for optical pick-up |
摘要 |
There is provided an objective lens for an optical pick-up. The objective lens is formed to be a single-element plastic lens having a first surface and a second surface. The first surface is configured to have, within an effective diameter, an inflection point at which a second derivative of a sag of the first surface takes a value of 0. Further, the objective lens having a numerical aperture larger than or equal to 0.75. |
申请公布号 |
US8223442(B2) |
申请公布日期 |
2012.07.17 |
申请号 |
US20080021516 |
申请日期 |
2008.01.29 |
申请人 |
YAMAGATA NAOKI;TAKEUCHI SHUICHI;HOYA CORPORATION |
发明人 |
YAMAGATA NAOKI;TAKEUCHI SHUICHI |
分类号 |
G02B13/18;G02B3/02;G11B7/135 |
主分类号 |
G02B13/18 |
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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