发明名称 |
OBJECT LENS, OPTICAL PICKUP DEVICE AND OPTICAL INFORMATION RECORDING/REPRODUCING DEVICE |
摘要 |
<p>A finite conjugate type object lens having interchangeability with a plurality of types of optical disk and being capable of correcting astigmatism occurring due to tracking and astigmatism provided by a light source itself; an optical pickup device and an optical information recording/reproducing device provided with this object lens. The optical pickup device comprises a first light source for outputting a first light flux, and second light source for outputting a second light flux, and a finite conjugate object lens for condensing the first and second light fluxes. The object lens has astigmatism to a light flux with a wavelength lambda1 and is disposed in such a direction that an astigmatism occurring direction decreases the astigmatism of a light flux with a wavelength lambda1 occurring due to tracking. In addition, the astigmatism of the object lens has a minimum value when an image height in the tracking direction of the object lens is within a specified range.</p> |
申请公布号 |
WO2005064607(A1) |
申请公布日期 |
2005.07.14 |
申请号 |
WO2004JP18815 |
申请日期 |
2004.12.16 |
申请人 |
KONICA MINOLTA OPTO, INC.;SAKAMOTO, KATSUYA |
发明人 |
SAKAMOTO, KATSUYA |
分类号 |
G02B5/18;G02B13/00;G02B13/18;G11B7/00;G11B7/12;G11B7/125;G11B7/135;(IPC1-7):G11B7/135 |
主分类号 |
G02B5/18 |
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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