发明名称 |
Spherical abberation compensator and optical pickup using the same |
摘要 |
A spherical aberration compensator for compensating for spherical aberration resulting from a thickness deviation of a recording medium. The spherical aberration compensator includes a central compensation which provides a phase distribution that is effective for compensating for spherical aberration resulting from the thickness deviation and a peripheral compensation portion which surrounds the central compensation portion and provides a phase distribution that is effective for reducing a worsening of the spherical aberration caused by axial displacement of an objective lens from the central compensation portion. The spherical aberration compensator effectively relieves an optical pickup having an objective lens of an NA of 0.7 or greater of worsening of the spherical aberration resulting from thickness deviation of the recording medium.
|
申请公布号 |
US2003086353(A1) |
申请公布日期 |
2003.05.08 |
申请号 |
US20020196139 |
申请日期 |
2002.07.17 |
申请人 |
SAMSUNG ELECTRONICS CO. LTD. |
发明人 |
CHUNG CHONG-SAM;AHN YOUNG-MAN;KIM TAE-KYUNG;SUH HEA-JUNG;KIM JONG-BAE |
分类号 |
G11B7/125;G11B7/135;(IPC1-7):G11B7/135 |
主分类号 |
G11B7/125 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|