发明名称 |
Optical pickup and optical disc apparatus |
摘要 |
An optical system is disclosed including an optical pickup having a wavefront aberration-correcting element capable of correcting coma aberration and astigmatism, and an optical disc apparatus which uses the optical pickup. The optical pickup includes a laser light source for irradiating an optical disc with a light beam; an objective lens for focusing the light beam on the optical disc; a lens for correcting astigmatism; a second lens for correcting coma aberration; and a photodetector for receiving the light beam reflected from the optical disc. The astigmatism and the coma aberration are corrected independently of each other.
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申请公布号 |
US7733759(B2) |
申请公布日期 |
2010.06.08 |
申请号 |
US20060588503 |
申请日期 |
2006.10.26 |
申请人 |
HITACHI MEDIA ELECTRONICS CO., LTD. |
发明人 |
SHIMADA KENICHI;IZUMI KATSUHIKO |
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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