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    • 2. 发明申请
    • OPTICAL DEVICE FOR RECORDING AND REPRODUCING.
    • 用于记录和复制的光学设备。
    • WO2006003571A1
    • 2006-01-12
    • PCT/IB2005/052085
    • 2005-06-24
    • KONINKLIJKE PHILIPS ELECTRONICS N.V.STALLINGA, SjoerdANDERSEN, OleHENDRIKS, Robert
    • STALLINGA, SjoerdANDERSEN, OleHENDRIKS, Robert
    • G11B7/135
    • G11B7/1381
    • An optical scanning device comprises a radiation source for producing a radiation beam, means for focusing said radiation beam on an information layer, and a detection branch comprising an astigmatic lens (106) and detecting means (108) located along an optical axis (109). The astigmatic lens produces a focal line between the astigmatic lens and the detecting means when the radiation beam is focused on the information layer. The detection branch further comprises filtering means (107) located at the focal line produced by the astigmatic lens. The filtering means comprise a non-transparent area (107b) surrounding a transparent area (107a) having a first dimension (dl) in a first direction parallel to the focal line and a second dimension (d2) in a second direction perpendicular to the first direction and to the optical axis. The first dimension is larger than the second dimension.
    • 光学扫描装置包括用于产生辐射束的辐射源,用于将所述辐射束聚焦在信息层上的装置以及包括沿着光轴(109)定位的像散透镜(106)和检测装置(108)的检测支路, 。 当辐射束聚焦在信息层上时,像散透镜在像散透镜和检测装置之间产生焦线。 检测分支还包括位于由像散透镜产生的焦线处的过滤装置(107)。 过滤装置包括围绕在平行于焦线的第一方向上具有第一尺寸(d1)的透明区域(107a)的不透明区域(107b),并且在垂直于第一方向的第二方向上具有第二尺寸(d2) 方向和光轴。 第一个维度大于第二个维度。