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Invention Grant
US08953428B2 Objective lens, optical head, optical disk device, and information processing device 有权
物镜，光头，光盘装置及信息处理装置

Objective lens, optical head, optical disk device, and information processing device
Abstract:
Assuming that third-order coma aberration per unit angle generated by tilt of BD (60) in recording or reproducing information on or from BD (60) is CMDbd, third-order coma aberration per unit angle generated by tilt of CD (80) in recording or reproducing information on or from CD (80) is CMDcd, third-order coma aberration per unit angle generated by tilt of a compatible objective lens (8) in recording or reproducing information on or from BD (60) is CMLbd, and third-order coma aberration per unit angle generated by tilt of the compatible objective lens (8) in recording or reproducing information on or from CD (80) is CMLcd, a sine condition deviation amount (SCbd) in recording or reproducing information on or from BD (60) is expressed by CMDbd+CMLbd, a sine condition deviation amount (SCcd) in recording or reproducing information on or from CD (80) is expressed by CMDcd+CMLcd, and the sine condition deviation amount (SCbd) and the sine condition deviation amount (SCcd) satisfy SCbd>0 and SCcd
Abstract(Chinese):

假设BD（60）在BD（60）上记录或再现信息时由BD（60）的倾斜产生的每单位角度的三阶彗差为CMDbd，则通过CD（80）的倾斜产生的每单位角度的三阶彗形像差 在CD（80）上或从CD（80）上记录或再现信息是CMDcd，在BD（60）上记录或再现信息时兼容物镜（8）的倾斜产生的每单位角度的三阶彗形像差是CMLbd，第三 在CD（80）上或从CD（80）记录或再现信息时由兼容物镜（8）的倾斜产生的每单位角度的单位角度的顺序彗差为CMLcd，在BD上记录或再现信息的正弦条件偏差量（SCbd） （60）由CMDbd + CMLbd表示，在CD（80）上或从CD（80）记录或再现信息的正弦条件偏差量（SCcd）由CMDcd + CMLcd表示，正弦条件偏差量（SCbd）和正弦条件 偏差量（SCcd）满足SCbd> 0a nd SCcd <0。

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