发明名称 |
Optical pickup device that corrects the spot shape of reflected light beams |
摘要 |
An optical head in which focussing error is detected by a spot size method used for recording and/or reproducing information signals on or from an optical disc. The optical head includes a unit for correcting the spot shape between the objective lens and a photodetector device. The spot shape correcting unit corrects part or all of light spots formed on the photodetector by a light beam reflected back by the optical disc so that the spot diameter in a direction traversing a track on the optical disc will be larger than the spot diameter along the track. |
申请公布号 |
US2005201220(A1) |
申请公布日期 |
2005.09.15 |
申请号 |
US20050124071 |
申请日期 |
2005.05.09 |
申请人 |
SONY CORPORATION |
发明人 |
NISHI NORIAKI |
分类号 |
G11B7/09;G11B7/007;G11B7/12;G11B7/125;G11B7/13;G11B7/135;G11B11/105;(IPC1-7):G11B7/135 |
主分类号 |
G11B7/09 |
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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