发明名称 |
OPTICAL ELEMENT FOR OPTICAL PICKUP DEVICE, OPTICAL PICKUP DEVICE AND METHOD FOR ASSEMBLING OPTICAL PICKUP DEVICE |
摘要 |
An optical element for an optical pickup device which can record and/or reproduce information interchangeably with an optical disc while correcting coma satisfactorily, and a compact optical pickup device employing that optical element and exhibiting excellent energy saving. In the optical element for an optical pickup device where a first objective lens portion and a second objective lens portion are formed integrally, one of the first objective lens portion and the second objective lens portion satisfies a relation |HCM|/|TCM|<0.3 and the other satisfies a relation |HCM|/|TCM|>0.3. The HCM represents the third-order angle of view coma sensitivity in the first objective lens portion or the second objective lens portion, and the TMC represents the third-order inclination angle coma sensitivity in the first objective lens portion or the second objective lens portion.
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申请公布号 |
US2010067356(A1) |
申请公布日期 |
2010.03.18 |
申请号 |
US20070519718 |
申请日期 |
2007.12.07 |
申请人 |
FUJII HIDEYUKI;OTA KOHEI;KIMURA TOHRU;NAKAMURA KENTAROU |
发明人 |
FUJII HIDEYUKI;OTA KOHEI;KIMURA TOHRU;NAKAMURA KENTAROU |
分类号 |
G11B7/135 |
主分类号 |
G11B7/135 |
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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