发明名称 |
OPTICAL SCANNING DEVICE |
摘要 |
An optical head for use in the scanning of a record carrier, the record carrier having data stored on data tracks therein on a plurality of information layers (3, 4) at a plurality of depths within the record carrier. The optical head comprises: a movable optical element (16) arranged in an optical path to act upon a first radiation beam (12) and a second radiation beam (14) to provide the beams with a different displacement perpendicular to the optical path; and a lens system for focusing said first beam (12) at a first focal point (A) on a first information layer (3) of the record carrier and the focusing of the second beam (14) at a second different focal point (B) on a second information layer (4), wherein a spacing, transverse to the data tracks, between said first and second focal points (A, B) is controllable by varying the configuration of the movable optical element. |
申请公布号 |
WO2004036568(A1) |
申请公布日期 |
2004.04.29 |
申请号 |
WO2003IB04022 |
申请日期 |
2003.09.15 |
申请人 |
KONINKLIJKE PHILIPS ELECTRONICS N.V.;GOOSSENS, HENDRIK, J.;TUKKER, TEUNIS, W. |
发明人 |
GOOSSENS, HENDRIK, J.;TUKKER, TEUNIS, W. |
分类号 |
G11B7/00;G11B7/085;G11B7/135;G11B7/14 |
主分类号 |
G11B7/00 |
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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