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    • 5. 发明授权
    • Electro-optic apodization having backward compatibility and discrimination capabilities for optical disk drives
    • 具有光学驱动器的向后兼容性和辨别能力的电光变迹
    • US06201630B1
    • 2001-03-13
    • US09005342
    • 1998-01-09
    • Kunjithapatham Balasubramanian
    • Kunjithapatham Balasubramanian
    • G02F103
    • G11B11/10543G02F1/03G11B7/00718G11B7/1356G11B7/1369G11B7/1381
    • The present invention preferably includes a shading band which is suitably electro-optically created in a grid pattern formed through a photolithographic process, so consequently, the electro optic shading band is easily eliminated or re-configured dynamically to substantially eliminate its shading effect for lower density optical disks which do not experience substantial adjacent track crosstalk (ATC). Eliminating or reconfiguring the shading effect also helps in accommodating different media types and generations and those of different manufacturers. Moreover, the electro-optic shading band suitably adjusts the amplitude, phase, frequency, polarization and/or the like of the light beam to compensate for possible material property variations, defects, misalignments or other imperfections in the reading process. The present electro-optic shading band substantially restricts or alters any portion of a light beam containing signal information read from an optical disk. In a preferred embodiment, the electro-optic shading band reduces undesired portion of the low frequency distribution in the diffraction pattern of the readout beam which results from reading marks in high density optical disks, thereby enhancing the signal relative to the noise and crosstalk in high performance optical disk drives.
    • 本发明优选地包括通过光刻工艺形成的栅格图案中适当地电光创建的遮光带,因此,电光阴影带可以被动态地消除或重新配置,从而基本上消除了其较低密度的遮蔽效应 不经历实质的相邻轨道串扰(ATC)的光盘。 消除或重新配置阴影效果还有助于适应不同的媒体类型和世代以及不同制造商的媒体类型。 此外,电光遮蔽带适当地调整光束的振幅,相位,频率,极化等,以补偿在读取过程中可能的材料特性变化,缺陷,未对准或其他缺陷。 本电光阴影带基本上限制或改变包含从光盘读取的信号信息的光束的任何部分。 在优选实施例中,电光阴影带减少由高密度光盘中的读标记产生的读出光束的衍射图案中的低频分布的不希望的部分,从而增强了相对于噪声和高串扰的信号 高性能光盘驱动器。