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1. 发明申请

WO2007034335A2 AN OPTICAL PICKUP HAVING ABERRATION CORRECTION 审中-公开
标题翻译：具有异常校正的光学拾取
公开(公告)号：WO2007034335A2
公开(公告)日：2007-03-29
申请号：PCT/IB2006/003833
申请日：2006-09-19
申请人： ARIMA DEVICES CORPORATION , XIANGYIN, Sunny Cheng , JUTTE, Petrus Theodorus
发明人： XIANGYIN, Sunny Cheng , JUTTE, Petrus Theodorus
IPC分类号： G11B7/125 , G11B7/135
CPC分类号： G11B7/1353 , G11B7/1275 , G11B7/1359 , G11B7/1365 , G11B7/1378 , G11B7/13922 , G11B7/1395 , G11B2007/0006
摘要： An optical pick-up unit is suitable for scanning a first type of record carrier having a first information density and at least a second type of record carrier, the second type of record carrier having a second information density different from the first information density. The optical pick-up unit comprises a first radiation source (16, 86) for emitting a first diverging radiation beam (24) for scanning the first type of record carrier, and at least a second radiation source (48, 96) for emitting a second radiation beam (50) for scanning the second type of record carrier. The optical pick-up unit also comprises a first beam splitter (58, 93, 104) for combining the first radiation beam and the second radiation beam on a common optical path. The first beam splitter is a plane-parallel plate-type beam splitter. A correcting element (20, 22, 72) for astigmatism and coma correction is arranged between the first radiation source and the first beam splitter.
摘要翻译：光学拾取单元适于扫描具有第一信息密度的第一类型的记录载体和至少第二类型的记录载体，第二类型的记录载体具有不同于第一信息密度的第二信息密度。光学拾取单元包括用于发射用于扫描第一类型的记录载体的第一发散辐射束（24）的第一辐射源（16,86）和用于发射第一类型记录载体的至少第二辐射源（48,96）用于扫描第二类型的记录载体的第二辐射束（50）。光学拾取单元还包括用于将第一辐射束和第二辐射束组合在公共光路上的第一分束器（58,93,104）。第一分束器是平面平行板型分束器。用于散光和彗差校正的校正元件（20,22,72）设置在第一辐射源和第一分束器之间。

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