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    • 9. 发明申请
    • OPTICAL HEAD DEVICE, AND RECORDING AND/OR REPRODUCING DEVICE
    • 光头设备,以及记录和/或再现设备
    • US20100254236A1
    • 2010-10-07
    • US12602718
    • 2008-05-29
    • Eishin MoriKousei SanoJoji AnzaiHideki Aikoh
    • Eishin MoriKousei SanoJoji AnzaiHideki Aikoh
    • G11B20/10G11B7/135
    • G11B7/13925G11B7/1376G11B2007/0006G11B2007/0013
    • An object of the invention is to suppress an influence of a wavefront aberration which is generated at the time of correcting a third-order spherical aberration, and realize satisfactory information recording and/or reproducing. A collimator lens 4 corrects a third-order spherical aberration which is generated depending on the thickness of a light transmissive layer from a surface of a first optical information recording medium 30, corresponding to an optimal substrate thickness of a first objective lens 6, to an intended information recording surface, assuming that the light transmissive layer thickness of the first optical information recording medium 30 which minimizes a residual third-order spherical aberration at the time of incidence of parallel light into the first objective lens 6 is defined as the optimal substrate thickness of the first objective lens 6. The optimal substrate thickness of the first objective lens 6 is defined in such a manner that a variation of a wavefront aberration which is generated on the information recording surface of the first optical information recording medium 30 farthest from the first objective lens 6 at the time of correcting the third-order spherical aberration, and a variation of a wavefront aberration which is generated on the information recording surface of the first optical information recording medium 30 closest to the first objective lens 6 at the time of correcting the third-order spherical aberration are set equal to each other.
    • 本发明的目的是抑制在校正三次球面像差时产生的波前像差的影响,并且实现满意的信息记录和/或再现。 准直透镜4将与第一光学信息记录介质30的表面相对应的透光层的厚度相应于第一物镜6的最佳基板厚度的三次球面像差校正为 假设将平行光入射到第一物镜6中的残余三阶球面像差最小化的第一光学信息记录介质30的透光层厚度定义为最佳基板厚度 第一物镜6的最佳基板厚度被定义为使得在第一光信息记录介质30的信息记录表面上产生的波前像差的变化最远离第一物镜6的第一物镜6。 在校正三次球面像差时的物镜6,以及a 在校正三次球面像差时在最靠近第一物镜6的第一光学信息记录介质30的信息记录表面上产生的波前像差的变化被设置为彼此相等。