发明名称 |
OPTICAL PICKUP DEVICE |
摘要 |
PURPOSE: To provide an optical pickup device which can be made lightweight and highly reliable by using a one-group lens as the objective and correcting the coma aberration which influences the characteristics of the objective when a higher NA(Numerical Aperture) is intended. CONSTITUTION: The condenser optical system comprises a one-group objective 7 having 0.75 NA and is provided with an aberration correcting optical system 6 to correct the coma aberration produced by the inclination or shift of the center axes of the both surfaces of the objective 7 or by the inclination of the objective to the recording face 9 of an optical recording medium 10.
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申请公布号 |
KR20020034955(A) |
申请公布日期 |
2002.05.09 |
申请号 |
KR20010067813 |
申请日期 |
2001.11.01 |
申请人 |
SHARP CORPORATION |
发明人 |
KITAMURA KAZUYA;KURATA YUKIO |
分类号 |
G02B7/00;G02B3/08;G02B13/18;G02B27/00;G11B7/095;G11B7/125;G11B7/135;(IPC1-7):G11B7/135 |
主分类号 |
G02B7/00 |
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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