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发明公开
CN1399260A 球面像差补偿器以及利用其的光学拾取头 失效 - 权利终止

球面像差补偿器以及利用其的光学拾取头
摘要：
本发明公开了一种能够有效补偿由于记录介质的厚度偏差导致的球面像差同时设置在光学拾取头的物镜之后的球面像差补偿器，该球面像差补偿器包括：与物镜同轴设置的中心补偿部分，该部分提供了对于补偿记录介质厚度偏差所导致的球面像差有效的相位分布；以及围绕中心部分的四周补偿部分，该部分提供了对于减小由物镜从中心补偿部分轴向偏移所导致的球面像差恶化有效的相位分布。球面像差补偿器可以有效地缓解在具有NA为0.7或更大的透镜的光学拾取头中由记录介质厚度偏差所导致的球面像差的恶化。
摘要（英）：

A spherical aberration compensator for compensating for spherical aberration resulting from a thickness deviation of a recording medium. The spherical aberration compensator includes a central compensation which provides a phase distribution that is effective for compensating for spherical aberration resulting from the thickness deviation and a peripheral compensation portion which surrounds the central compensation portion and provides a phase distribution that is effective for reducing a worsening of the spherical aberration caused by axial displacement of an objective lens from the central compensation portion. The spherical aberration compensator effectively relieves an optical pickup having an objective lens of an NA of 0.7 or greater of worsening of the spherical aberration resulting from thickness deviation of the recording medium.

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