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    • 7. 发明申请
    • OPTICAL SCANNING UNIT COMPRISING A FIRST AND A SECOND LENS UNIT
    • 包括第一和第二透镜单元的光学扫描单元
    • WO9949460A3
    • 1999-11-11
    • PCT/IB9900436
    • 1999-03-15
    • KONINKL PHILIPS ELECTRONICS NVPHILIPS SVENSKA AB
    • ZIJP FERRY
    • G11B21/21G11B7/09G11B7/12G11B7/135
    • G11B7/13927G11B7/093G11B7/0935G11B7/122G11B7/1374
    • Optical scanning device for scanning an information plane (1a) of a disc-shaped optical recording medium (1) having an outer surface (1b) extending parallel to the information plane. The scanning device comprises a radiation source (7) for supplying a scanning beam (7a), and an optical scanning unit which comprises a lens system for focusing the scanning beam to a scanning spot (7b) on the information plane. The lens system has an optical axis (9) and comprises a first lens unit (9a) with a first lens (9a1) having an entrance side (11) and an exit side (13), and a second lens unit (9b) with a second lens (9b1) situated opposite the exit side of the first lens. The scanning unit also comprises a drive means for displacing the first lens along the optical axis and an adjusting means for adjusting the second lens with respect to the recording medium. To inhibit spherical and/or comatic and/or astigmatic aberrations during scanning, the adjusting means comprises a rotatably driven rotation element (15) which forms part of the second lens unit, is journaled in a stationary element (17) and has a disc-shaped surface (15a) provided with a pattern of grooves for cooperation with the outer surface of the recording medium.
    • 用于扫描具有平行于信息平面延伸的外表面(1b)的盘状光学记录介质(1)的信息平面(1a)的光学扫描装置。 扫描装置包括用于提供扫描光束(7a)的辐射源(7)以及包括用于将扫描光束聚焦到信息平面上的扫描点(7b)的透镜系统的光学扫描单元。 该透镜系统具有光轴(9)并且包括具有第一透镜(9a1)和第二透镜单元(9b)的第一透镜单元(9a),该第一透镜具有入射侧(11)和出射侧(13) 位于第一透镜的出射侧对面的第二透镜(9b1)。 扫描单元还包括用于使第一透镜沿着光轴移位的驱动装置和用于相对于记录介质调节第二透镜的调节装置。 为了在扫描过程中抑制球面像差和/或彗形像差和/或像散像差,调节装置包括形成第二透镜单元的一部分的可旋转驱动的旋转元件(15),轴颈式固定在固定元件(17)中, (15a)设置有用于与记录介质的外表面配合的沟槽图案。