| 发明名称 |
OPTICAL UNIT, OPTICAL INFORMATION RECORDING/REPRODUCING DEVICE AND OPTICAL INFORMATION RECORDING/REPRODUCING METHOD |
| 摘要 |
<p>A light quantity of a beam can be increased by using a single beam as a focal point controlling beam. At the time of receiving by an optical detector a beam which has been collected on a focal point controlling reference surface, other unnecessary beams received by the optical detector are eliminated.</p> |
| 申请公布号 |
WO2009119608(A1) |
申请公布日期 |
2009.10.01 |
| 申请号 |
WO2009JP55858 |
申请日期 |
2009.03.24 |
| 申请人 |
KATAYAMA, RYUICHI;NEC CORPORATION |
发明人 |
KATAYAMA, RYUICHI |
| 分类号 |
G11B7/0065;G11B7/09;G11B7/135 |
主分类号 |
G11B7/0065 |
| 代理机构 |
|
代理人 |
|
| 主权项 |
|
| 地址 |
|
