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    • 10. 发明授权
    • Objective lens, optical head and optical disc device
    • 物镜,光头和光盘装置
    • US08233371B2
    • 2012-07-31
    • US12159425
    • 2006-12-27
    • Fumitomo YamasakiKatsuhiko HayashiSadao MizunoHideki Aikoh
    • Fumitomo YamasakiKatsuhiko HayashiSadao MizunoHideki Aikoh
    • G11B7/00
    • G02B9/10G02B3/08G02B13/18G11B7/1275G11B7/1374G11B7/13922G11B2007/0006
    • Provides an objective lens, an optical head and an optical disc apparatus (drive) capable of compensating for various types of aberrations including wavelength changes for a plurality of types of optical discs including high density optical discs, DVDs and CDs with a good wavelength dispersion compensation ability and thus capable of providing good recording or reproduction characteristics.The objective lens according to the present invention includes a first lens and a second lens substantially in close contact with each other such that optical axes thereof match each other, and acts as a convex lens as a whole. Each lens includes a central portion including the optical axis and a peripheral portion located in a periphery of the central portion. The central portion of the first lens acts as a convex lens; and the central portion of the second lens acts as a concave lens. Where the refractive index of the first lens at d line (wavelength: 587.56 nm) is nd1, the Abbe constant of the first lens represented using the refractive indices at d line, F line (wavelength: 486.13 nm) and C line (wavelength: 656.27 nm) is νd1, the refractive index of the second lens at d line is nd2, and the Abbe constant of the second lens represented using the refractive indices at d line, F line and C line is νd2, the objective lens fulfills nd1>nd2 and νd1>νd2.
    • 提供能够补偿包括具有良好的波长色散补偿的高密度光盘,DVD和CD的多种类型的光盘的波长变化的各种像差的物镜,光头和光盘装置(驱动器) 因此能够提供良好的记录或再现特性。 根据本发明的物镜包括基本上彼此紧密接触的第一透镜和第二透镜,使得其光轴彼此匹配,并且作为整体起凸透镜的作用。 每个透镜包括包括光轴的中心部分和位于中心部分的周边的周边部分。 第一透镜的中心部分用作凸透镜; 并且第二透镜的中心部分用作凹透镜。 在d线(波长:587.56nm)处的第一透镜的折射率为nd1的情况下,使用在d线,F线(波长:486.13nm)和C线(波长:48nm)处的折射率表示的第一透镜的阿贝常数 656.27nm)是d1,d线的第二透镜的折射率为nd2,使用d线,F线和C线的折射率表示的第二透镜的阿贝常数为d2,目标 镜头满足nd1> nd2和&ngr; d1>&ngr; d2。