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CN1841531A 光学拾取器、光学记录再现设备及循轨误差信号检测方法 失效 - 权利终止

光学拾取器、光学记录再现设备及循轨误差信号检测方法
摘要：
提供一种光学拾取器和一种采用该光学拾取器的光学记录和/或再现设备，其中，该光学拾取器包括：光源；物镜，用于聚集入射光束，并且将所述入射光束聚焦在信息存储介质上；全息光栅，用于通过衍射将由光源发射的光分为主光束以及第一和第二副光束，并且在所述第一和第二副光束中提供或产生连续变化的波前，以减小所述第一和第二副光束的副推挽(SPP)信号的交流(AC)分量的振幅；和光电检测器，用于接收聚焦在信息存储介质上并从信息存储介质反射的所述主光束以及第一和第二副光束，以获得所述主光束的主推挽(MPP)信号以及所述第一和第二副光束的SPP信号。
摘要（英）：

An optical pickup and an optical recording and/or reproducing apparatus employing the optical pickup, wherein the optical pickup includes: a light source; an objective lens to collect and focus an incident beam on an information storage medium; a holographic grating to split light emitted by the light source into a main beam and first and second sub-beams by diffraction and to provide, or create, a continuously changing wavefront in the first and second sub-beams to reduce the amplitude of an AC component of a sub-push-pull (SPP) signal of the first and second sub-beams; and a photodetector to receive the main beam and the first and second sub-beams that are focused on and reflected from the information storage medium and to obtain a main push-pull (MPP) signal of the main beam and a SPP signal of the first and second sub-beams.

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