发明名称 |
Optical pickup for performing recording or reading operation on recording medium having prepits |
摘要 |
An optical pickup for reading information from a recording medium having a plurality of prepits or for recording information onto the recording medium is provided. The optical pickup includes: a light emitting device for emitting a light beam to the recording medium; a dividing device for dividing the light beam reflected by the recording medium into a first divided beam and a second divided beam; an astigmatism producing device for producing astigmatism in the first divided beam; a first light receiving device for receiving the first divided beam from the astigmatism producing device; and a second light receiving device for receiving the second divided beam from the dividing device.
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申请公布号 |
US6577565(B1) |
申请公布日期 |
2003.06.10 |
申请号 |
US19990348124 |
申请日期 |
1999.07.02 |
申请人 |
PIONEER ELECTRONIC CORPORATION |
发明人 |
YANAGAWA NAOHARU;YOSHIDA MASAYOSHI;SHIMODA YOSHITAKA |
分类号 |
G11B7/135;G11B7/005;G11B7/09;(IPC1-7):G11B7/095 |
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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