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    • 4. 发明申请
    • Spot Size Focus Error Detection For Multiple Beam Optical Scanning Device
    • 多光束光学扫描装置的斑点聚焦误差检测
    • US20080159112A1
    • 2008-07-03
    • US11815107
    • 2006-01-26
    • Alexander Marc Van Der LeeCoen Theodorus Hubertus Fransiscus LiedenbaumTeunis Willem Tukker
    • Alexander Marc Van Der LeeCoen Theodorus Hubertus Fransiscus LiedenbaumTeunis Willem Tukker
    • G11B7/00
    • G11B7/0912G11B7/131G11B7/14
    • A device (1) for scanning an optical disc (6), the disc (6) comprising substantially parallel data tracks (10). The device (1) comprises an optical unit for creating track light spots (12) on the data tracks (10) and a plurality of detector light spots on a plurality of signal detectors. The device further comprises a focus error unit for with a beam manipulating element (21, 22, 22a, 92) for providing for at least one of the reflected beams a first optical path (24) to a first segmented detector (8a) and a second optical path (25) to a second segmented detector (8b). The lengths of the first optical path (24) and the second optical path (25) exhibit a difference (Dd), such that an intensity distribution of a first detector light spot on the first segmented detector (8a) is equal to an intensity distribution of a second detector light spot on the second segmented detector (8b) when the at least one track light spot is correctly focussed and that the intensity distribution on the first segmented detector (8a) differs from the intensity distribution on the second segmented detector (8b) when the at least one track light spot is not correctly focussed. The difference (Dd) is substantially less than a quotient of a distance between two adjacent detector light spots (Ds) and a numerical aperture (NA) of the lens (7). A dimension (D1) of a light detecting area of the segmented detectors in a direction of adjacent detector light spots is less than the distance (Ds) between two adjacent detector light spots.
    • 一种用于扫描光盘(6)的设备(1),所述盘(6)包括基本上平行的数据轨道(10)。 设备(1)包括用于在数据轨道(10)上创建轨道光点(12)的光学单元和多个信号检测器上的多个检测器光点。 该装置还包括一个聚焦误差单元,用于与光束操纵元件(21,22,22a,92)一起提供至少一个反射光束到第一分段检测器(8a)的第一光路(24) 以及到第二分段检测器(8b)的第二光路(25)。 第一光路(24)和第二光路(25)的长度呈现差(Dd),使得第一分段检测器(8a)上的第一检测器光点的强度分布等于强度 当所述至少一个轨道光点被正确聚焦并且所述第一分段检测器(8a)上的强度分布与所述第二分段检测器(8a)上的强度分布不同时,所述第二分段检测器(8b)上的第二检测器光点的分布 当至少一个轨道光点未被正确聚焦时,检测器(8b)。 差值(Dd)基本上小于两个相邻检测器光点(Ds)和透镜(7)的数值孔径(NA)之间的距离的商。 分段检测器的光检测区域在相邻检测器光点的方向上的尺寸(D 1)小于两个相邻检测器光点之间的距离(Ds)。
    • 8. 发明申请
    • Optical Scanning Device
    • 光学扫描装置
    • US20080186831A1
    • 2008-08-07
    • US11817806
    • 2006-03-06
    • Teunis Willem TukkerCoen Theodorus Hubertus Fransiscus LiedenbaumBernardus Hendrikus Wilhelmus HendriksSjoerd StallingaAlbert Hendrik Jan ImminkStein KuiperMing Song Chen
    • Teunis Willem TukkerCoen Theodorus Hubertus Fransiscus LiedenbaumBernardus Hendrikus Wilhelmus HendriksSjoerd StallingaAlbert Hendrik Jan ImminkStein KuiperMing Song Chen
    • G11B7/00
    • G11B7/1369G11B7/0909G11B7/1381
    • An optical scanning device (1) includes a radiation source (7), a detector (23) and a beam splitter (9). The radiation source (7) provides an incident radiation beam (4, 20) along a first optical path (19a) for scanning an information layer (2) of an optical record carrier (3). The detector (23) detects at least a portion of the radiation beam (22) reflected from the optical record carrier (3). The beam splitter (9) transmits the incident radiation beam (4) received from the radiation source along the first optical path (19a) towards the optical record carrier. The beam splitter (9) also transmits the reflected beam (22) received from the optical record carrier (3) along a second, different optical path (19b) towards the detector. The optical scanning device further includes a beam-deflecting element (30; 130; 230; 330; 630; 830; 930) positioned on the second optical path (19b) between the beam splitter (9) and the detector (23). The beam-deflecting element (30; 130; 230; 330; 630; 830; 930) is arranged to controllably deflect the path of the reflected radiation beam (22) for adjusting the lateral position of said reflected radiation beam incident upon the detector (23) over a predetermined range.
    • 光学扫描装置(1)包括辐射源(7),检测器(23)和分束器(9)。 辐射源(7)沿着第一光路(197)提供入射辐射束(4,20),用于扫描光学记录载体(3)的信息层(2)。 检测器(23)检测从光学记录载体(3)反射的辐射束(22)的至少一部分。 分束器(9)将从辐射源接收的入射辐射束(4)沿着第一光路(21a)传送到光学记录载体。 分束器(9)还将从光学记录载体(3)接收的反射光束(22)沿着第二不同的光路(20b)传送到检测器。 光学扫描装置还包括位于分束器(9)和检测器(23)之间的位于第二光路(19b)上的光束偏转元件(30; 130; 230; 330; 630; 830; 930)。 光束偏转元件(30; 130; 230; 330; 630; 830; 930)被布置成可控地偏转反射的辐射束(22)的路径,用于调节入射到检测器上的所述反射的辐射束的横向位置( 23)超过预定范围。