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    • 22. 发明授权
    • Optical pickup device having a structure providing efficient light usage
    • 具有提供高效光使用的结构的光拾取装置
    • US07969834B2
    • 2011-06-28
    • US11763163
    • 2007-06-14
    • Shinichi HamaguchiNaoki NakanishiTatsuya NakamoriNaoto Shimada
    • Shinichi HamaguchiNaoki NakanishiTatsuya NakamoriNaoto Shimada
    • G11B7/00
    • G11B7/1353G11B7/123G11B7/1275G11B7/131G11B2007/0006
    • The optical pickup device according to the present invention includes: a light source which emits light at first, second and third wavelengths; an optical path combining unit which combines vectors of the light at the first, second and third wavelengths which is emitted by the light source, and matches optical axes of the light at the first wavelength and the light at the third wavelength; a light condensing unit which condenses the light from the optical path combining unit onto the optical information storage medium; a diffraction element which diffracts light at the first, second and third wavelength which is reflected from the optical information storage medium, in a first direction and a second direction respectively; a first photo detector which receives light at the first, second and third wavelength that is diffracted in the first direction by the diffraction element; a second photo detector which receives light at the first and third wavelength that is diffracted in the second direction by the diffraction element; and a third photo detector which receives light at the second wavelength that is diffracted in the second direction by the diffraction element.
    • 根据本发明的光拾取装置包括:以第一,第二和第三波长发光的光源; 光路组合单元,其组合由所述光源发射的所述第一,第二和第三波长的光的矢量,并且匹配所述第一波长的光的光轴和所述第三波长的光; 聚光单元,其将来自光路组合单元的光聚合到光学信息存储介质上; 衍射元件,其在第一方向和第二方向上分别衍射从光信息存储介质反射的第一,第二和第三波长的光; 第一光电检测器,其接收由衍射元件沿第一方向衍射的第一,第二和第三波长的光; 第二光检测器,其通过衍射元件接收在第二方向衍射的第一和第三波长的光; 以及第三光电检测器,其接收由衍射元件沿第二方向衍射的第二波长的光。
    • 23. 发明申请
    • OPTICAL PICKUP DEVICE
    • 光学拾取器件
    • US20100157778A1
    • 2010-06-24
    • US12090563
    • 2007-07-18
    • Naoto ShimadaHiroaki YamamotoNaoki NakanishiMasahiko NishimotoTakuya Okuda
    • Naoto ShimadaHiroaki YamamotoNaoki NakanishiMasahiko NishimotoTakuya Okuda
    • G11B7/135
    • G11B7/0903G11B7/1353
    • An optical pickup device includes a diffraction grating 12 for separating an emitted light beam into at least three light beams. The diffraction grating 12 is divided into three regions by dividing lines D1 and D2 extending in a first direction parallel to a tangent line of a track of an optical information recording medium. A second region 12B is divided into four sub-blocks by a dividing line D3 extending in the first direction and a dividing line D4 extending in a second direction that crosses the first direction. The sub-blocks located diagonally opposite to each other have a same phase, and the sub-blocks located adjacent to each other have a phase difference of approximately 180 degrees. The first region 12A has a phase difference of approximately 90 degrees from each sub-block of the second region 12B, and the first region 12A has a phase difference of approximately 180 degrees from the third region 12C.
    • 光学拾取装置包括用于将发射的光束分离成至少三个光束的衍射光栅12。 衍射光栅12通过沿与光信息记录介质的轨道的切线平行的第一方向延伸的线D1和D2分成三个区域。 第二区域12B通过沿第一方向延伸的分割线D3和沿与第一方向交叉的第二方向延伸的分割线D4被分成四个子块。 彼此对角地相对的子块具有相同的相位,并且彼此相邻的子块具有大约180度的相位差。 第一区域12A与第二区域12B的每个子块具有大约90度的相位差,并且第一区域12A与第三区域12C具有大约180度的相位差。
    • 29. 发明授权
    • Optical device with diffraction grating having plural grating regions
    • 具有衍射光栅的光学器件具有多个光栅区域
    • US06728035B2
    • 2004-04-27
    • US10251471
    • 2002-09-20
    • Shoichi TakasukaShinichi IjimaHideyuki NakanishiAkio YoshikawaNaoki Nakanishi
    • Shoichi TakasukaShinichi IjimaHideyuki NakanishiAkio YoshikawaNaoki Nakanishi
    • G02B518
    • G11B7/1353G02B5/1866G11B7/0903G11B7/123G11B7/1356G11B11/10543G11B11/10576
    • An optical device includes a light-emitting element for irradiating light onto an information recording medium, a diffraction grating for splitting light emitted from said light-emitting element into a plurality of beams, a focussing member for focussing the plurality of beams onto the information recording medium, a deflection member for deflecting the plurality of beams after they have been reflected from the information recording medium; and a photodetector for receiving the plurality of beams after they have been deflected by the deflection member. The diffraction grating has a first grating region and a second grating region, which have different diffraction efficiencies. The zero-order diffraction light in the first grating region is used as the main beam for reproducing the information signal, and the +1-order or −1-order diffraction light in the second grating regions is used as sub-beams for reproduction of the tracking error signal. Thus, the light amount of both the main beam and the sub-beams can be increased without increasing the light emission of the semiconductor laser element 1, and the S/N ratio of the main beam and the sub-beams can be enhanced.
    • 光学装置包括用于将光照射到信息记录介质上的发光元件,用于将从所述发光元件发射的光分解为多个光束的衍射光栅,用于将多个光束聚焦到信息记录上的聚焦部件 介质,用于在已经从信息记录介质反射之后偏转多个光束的偏转构件; 以及用于在被偏转构件偏转之后接收多个光束的光电检测器。 衍射光栅具有第一光栅区域和第二光栅区域,其具有不同的衍射效率。 将第一光栅区域中的零级衍射光用作再现信息信号的主光束,并且将第二光栅区域中的+ 1级或-1级衍射光用作用于再现 跟踪误差信号。 因此,在不增加半导体激光元件1的发光的同时,可以增加主光束和子光束的光量,并且可以提高主光束和子光束的S / N比。