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    • 22. 发明授权
    • Optical head and optical disc device
    • 光头和光盘装置
    • US07742384B2
    • 2010-06-22
    • US11924225
    • 2007-10-25
    • Fumitomo YamasakiKousei SanoYoshiaki KommaKanji WakabayashiToshiyasu Tanaka
    • Fumitomo YamasakiKousei SanoYoshiaki KommaKanji WakabayashiToshiyasu Tanaka
    • G11B7/00
    • G11B7/1275G11B7/0903G11B7/0906G11B7/0909G11B7/131G11B7/1353G11B2007/0006
    • The present invention aims to provide an optical head and an optical disk device capable of suitably detecting tracking error signals for different types of optical discs.A polarizing hologram element includes a first area and a second area adjacent to the first area in an area where a beam reflected and diffracted by a BD passes. The first area includes a first transmission area for transmitting many 1st-order diffracted lights from the BD, a second transmission area adjacent to the first transmission area and closer to an optical axis than the first transmission area, and a third transmission area adjacent to the first and second transmission areas. The second area includes a fourth transmission area for transmitting many 1st-order diffracted lights from the BD, a fifth transmission area adjacent to the fourth transmission area and closer to the optical axis than the fourth transmission area, and a sixth transmission area adjacent to the fourth and fifth transmission areas.
    • 本发明的目的在于提供一种能够适当地检测不同类型的光盘的跟踪误差信号的光头和光盘装置。 偏振全息元件包括在BD反射和衍射的光束通过的区域中与第一区域相邻的第一区域和第二区域。 第一区域包括用于从BD发送许多1级衍射光的第一透射区域,与第一透射区域相邻并且比第一透射区域更靠近光轴的第二透射区域和与第一透射区域相邻的第三透射区域 第一和第二传输区域。 第二区域包括用于从BD传输许多1级衍射光的第四传输区域,与第四传输区域相邻并且比第四传输区域更靠近光轴的第五传输区域,以及与第四传输区域相邻的第六传输区域 第四和第五传输区域。
    • 29. 发明申请
    • INFORMATION RECORDING MEDIUM, INFORMATION SUPPLY SYSTEM, AND OPTICAL INFORMATION DEVICE
    • 信息记录介质,信息供应系统和光信息设备
    • US20080117755A1
    • 2008-05-22
    • US11940799
    • 2007-11-15
    • Fumitomo YamasakiKanji WakabayashiYoshiaki KommaToshiyasu Tanaka
    • Fumitomo YamasakiKanji WakabayashiYoshiaki KommaToshiyasu Tanaka
    • G11B7/00G11B7/24
    • G11B7/1387G11B7/1275G11B7/1374G11B7/24038G11B7/24079G11B2007/0006G11B2007/0013
    • An optical disk compliant with both a conventional optical disk such as a BD, HD DVD, and the like and a next-generation high-density optical disk according to a near-field light recording system and the like is provided.An information recording medium includes a first information recording layer and a second information recording layer, to/from which information is recorded or reproduced using laser beam. The first information recording layer is formed at a laser beam entrance surface, and is configured so that information can be recorded thereupon and/or reproduced therefrom using a first objective lens having a first numerical aperture NA1 and laser beam of a first wavelength λ1. The second information recording layer is formed so as to have a distance to the laser beam entrance surface is 0.05 mm to 1.2 mm and is configured so that information can be recorded thereupon and/or reproduced therefrom using a second objective lens having a second numerical aperture NA2 and laser beam of a second wavelength λ2. When a diffraction limit δ2, determined by the numerical aperture NA2 and the second wavelength λ2, is taken as δ2=0.61×λ2/NA2, a track pitch Tp1 of a track formed on the first information recording layer is Tp1
    • 提供了兼容诸如BD,HD DVD等常规光盘的光盘以及根据近场光记录系统等的下一代高密度光盘。 信息记录介质包括第一信息记录层和第二信息记录层,使用激光束对信息进行记录或再现。 第一信息记录层形成在激光入射面,并且被配置为使得可以使用具有第一数值孔径NA 1和第一波长λ1的激光束的第一物镜在其上记录和/或再现信息 第二信息记录层形成为具有与激光束入射面的距离为0.05mm〜1.2mm,并且被配置为使得可以使用具有第二数值的第二物镜在其上记录和/或从其再现信息 孔径NA 2和第二波长λ2的激光束。 当由数值孔径NA 2和第二波长λ2确定的衍射极限值δ2作为Δ2 = 0.61×λ2 / NA 2时,形成在第一信息记录层上的轨道的轨道间距Tp 1为 Tp 1