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CN101061539A 光检测器上具有可变换直径的光斑的光头 失效 - 权利终止

光检测器上具有可变换直径的光斑的光头
摘要：
在能够扫描不同类型的光学记录载体(5)的信息平面的光学扫描设备(10)中，所述类型诸如BD，DVD和CD，在检测器(7)上的光斑的直径依赖于物镜系统(4)的数值孔径，该物镜系统用来扫描记录载体。对于扫描BD的光检测系统的最优设计，导致对于其它类型诸如DVD和CD产生小的光斑。通过在DVD或CD被扫描的情况下，实施增加光斑直径的光学元件(13)，漫射光的影响被减小并且跟踪信号被改善。
摘要（英）：

In an optical scanning device (10) capable of scanning an information plane of an optical record carrier (5) of different types such as BD, DVD and CD, the diameter of the radiation spot on the detector (7) is dependent on the numerical aperture of the objective system (4) that is used for scanning the record carrier. An optimal design of the optical detection system for scanning a BD, result in a small radiation spot for the other types such as DVD and CD. By implementing an optical element (13) that increases the diameter of the radiation spot in the situation a DVD or CD is scanned, the influence of stray light is reduced and the tracking signals are improved.

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