发明名称 |
OPTICAL LENS SYSTEM AND SCANNING DEVICE PROVIDED WITH SUCH A SYSTEM |
摘要 |
In a lens system for focusing a divergent beam (7) in a small spot (18) and comprising a collimator lens (9) and an objective lens (10), the collimator lens is composed of a positive plastics lens element (31) and a negative glass lens element (32). This collimator corrects the temperature-dependent spherical aberration of the objective lens. This lens system is very suitable for a scanning device and an apparatus for reading/writing high-density optical discs (2, 3).
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申请公布号 |
WO0037982(A3) |
申请公布日期 |
2000.08.10 |
申请号 |
WO1999EP10204 |
申请日期 |
1999.12.20 |
申请人 |
KONINKLIJKE PHILIPS ELECTRONICS N.V.;BRAAT, JOSEPHUS, J., M. |
发明人 |
BRAAT, JOSEPHUS, J., M. |
分类号 |
G02B13/00;G02B9/10;G02B13/18;G02B21/00;G11B7/135;(IPC1-7):G11B7/135;G11B7/125 |
主分类号 |
G02B13/00 |
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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