发明名称 |
METHOD AND APPARATUS FOR GENERATING FOCUS ERROR SIGNALS IN A MULTI-BEAM OPTICAL DISK DRIVE |
摘要 |
A focus detection system for use in a multi-beam optical pickup assembly is provided that uses an optical element (44), either a holographic element or diffractive element, to split beams reflected off of a data-bearing surface of an optical disk (100) into a plurality of data beams and a plurality of focu s beams. The optical element also introduces astigmatism into the focus beams. The focus beams are projected onto focus detectors configured to account for overlap between adjacent focus beams to produce an accurate focus error sign al.
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申请公布号 |
CA2345139(A1) |
申请公布日期 |
2000.04.20 |
申请号 |
CA19992345139 |
申请日期 |
1999.10.08 |
申请人 |
ZEN RESEARCH, (IRELAND) LTD. |
发明人 |
KOSOBURD, TATANIA;ALON, AMIR;SHAPIRA, SHLOMO;NAOR, MICHAEL |
分类号 |
G11B7/09;G11B7/13;G11B7/135;G11B7/14;(IPC1-7):G11B7/14 |
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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