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    • 3. 发明授权
    • Optical pickup device
    • 光学拾取装置
    • US07978586B2
    • 2011-07-12
    • US12090385
    • 2007-07-18
    • Naoto ShimadaHiroaki YamamotoNaoki NakanishiMasahiko NishimotoTakuya Okuda
    • Naoto ShimadaHiroaki YamamotoNaoki NakanishiMasahiko NishimotoTakuya Okuda
    • G11B7/00
    • G11B7/0903G11B7/127G11B7/1353
    • An optical pickup device includes a diffraction grating 12 for separating a light beam emitted from a semiconductor laser element into at least three light beams. The diffraction grating 12 is divided into three regions by a straight line extending in a direction parallel to a tangent line of a track of an optical information recording medium. A second region 12B is divided into a first sub-block 13 and a second sub-block 14 by a straight line extending in a direction parallel to a radius direction of the optical information recording medium. The first sub-block 13 has a phase difference of approximately 180 degrees from the second sub-block 14. The first region 12A has a phase difference of approximately 90 degrees from the first sub-block 13 and has a phase difference of approximately 180 degrees from the third region 12C.
    • 光拾取装置包括用于将从半导体激光元件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光道的切线平行的方向延伸的直线分成三个区域。 第二区域12B通过沿与光信息记录介质的半径方向平行的方向延伸的直线分成第一子块13和第二子块14。 第一子块13具有与第二子块14大约180度的相位差。第一区12A具有与第一子块13大约90度的相位差,并且具有大约180度的相位差 从第三区域12C。
    • 7. 发明授权
    • Optical pickup device
    • 光学拾取装置
    • US07535814B2
    • 2009-05-19
    • US11704967
    • 2007-02-12
    • Masahiko NishimotoNaoki NakanishiMasayuki Ono
    • Masahiko NishimotoNaoki NakanishiMasayuki Ono
    • G11B7/00
    • G11B7/1275G11B7/0903G11B7/1353G11B2007/0006
    • An optical pickup device includes a diffraction grating for separating a light beam from a semiconductor laser into at least three light beams. The diffraction grating is partitioned into five areas each having a given periodic structure: a first area; a second area adjacent to the first area in a first direction; a third area adjacent to the first and second areas in a second direction; a fourth area sandwiching the third area with the first area; and a fifth area adjacent to the fourth area in the first direction and sandwiching the third area with the second area. The phase of the periodic structure of each of the first and fifth areas is ahead of that of the third area by substantially 90°. The phase of the periodic structure of each of the second and fourth areas is behind that of the third area by substantially 90°.
    • 光学拾取装置包括用于将来自半导体激光器的光束分离成至少三个光束的衍射光栅。 衍射光栅被划分成五个区域,每个区域具有给定的周期性结构:第一区域; 在第一方向上邻近所述第一区域的第二区域; 在第二方向上邻近所述第一和第二区域的第三区域; 第三个区域与第一个区域相区别; 以及与第一方向相邻的第四区域的第五区域,并且将第三区域与第二区域夹在中间。 第一和第五区域中的每一个的周期性结构的相位比第三区域的周期结构的相位大致90°。 第二区域和第四区域中的每一个的周期性结构的相位在第三区域的周期结构的相位之后大致为90°。
    • 9. 发明授权
    • Optical pickup apparatus
    • 光拾取装置
    • US07247826B2
    • 2007-07-24
    • US11384291
    • 2006-03-21
    • Shinichi HamaguchiNaoki NakanishiTatsuya NakamoriNaoto Shimada
    • Shinichi HamaguchiNaoki NakanishiTatsuya NakamoriNaoto Shimada
    • G02B7/04G02B27/40G02B27/64
    • G02B5/32G02B7/04G02B27/1073G02B27/1093G02B27/40G11B7/123G11B7/1275G11B7/131G11B7/1353G11B7/1356G11B2007/0006
    • An optical path coupling member aligns an optical axis directed to a light condensing member of the first wavelength light having a shortest wavelength with that of the third wavelength light having a longest wavelength. A diffraction element condenses +2nd order diffracted light of the first wavelength light and +1st order diffracted light of the second wavelength light and third wavelength light into a first photodetector, the −2nd order diffracted light of the first wavelength light and −1st order diffracted light of the third wavelength light into a second photodetector, and −1st order diffracted light of the remaining second wavelength light into a photodetector, using ±2nd order diffracted light of the first wavelength light and ±1st order diffracted light of the second wavelength light and third wavelength light as signal light from an optical information recording medium. Consequently, the overall size of the optical pickup apparatus is reduced.
    • 光路耦合部件将具有最短波长的第一波长光的聚光部件的光轴与具有最长波长的第三波长光的光轴对准。 衍射元件将第一波长光的+ 2级衍射光和第二波长光和第三波长光的+ 1级衍射光聚合成第一光电检测器,第一波长光和-1级衍射的-2级衍射光 使用第二波长光的±2级衍射光和第二波长光的±1级衍射光,将第三波长的光照射到第二光电检测器中,并将剩余的第二波长的光的-1级衍射光转换成光电检测器,并且 第三波长光作为来自光学信息记录介质的信号光。 因此,光拾取装置的总体尺寸减小。
    • 10. 发明申请
    • Optical pickup apparatus
    • 光拾取装置
    • US20060237624A1
    • 2006-10-26
    • US11384291
    • 2006-03-21
    • Shinichi HamaguchiNaoki NakanishiTatsuya NakamoriNaoto Shimada
    • Shinichi HamaguchiNaoki NakanishiTatsuya NakamoriNaoto Shimada
    • G02B7/04G02B27/40
    • G02B5/32G02B7/04G02B27/1073G02B27/1093G02B27/40G11B7/123G11B7/1275G11B7/131G11B7/1353G11B7/1356G11B2007/0006
    • An optical path coupling member aligns an optical axis directed to a light condensing member of the first wavelength light having a shortest wavelength with that of the third wavelength light having a longest wavelength. A diffraction element condenses +2nd order diffracted light of the first wavelength light and +1st order diffracted light of the second wavelength light and third wavelength light into a first photodetector, the −2nd order diffracted light of the first wavelength light and −1st order diffracted light of the third wavelength light into a second photodetector, and −1st order diffracted light of the remaining second wavelength light into a photodetector, using ±2nd order diffracted light of the first wavelength light and ±1st order diffracted light of the second wavelength light and third wavelength light as signal light from an optical information recording medium. Consequently, the overall size of the optical pickup apparatus is reduced.
    • 光路耦合部件将具有最短波长的第一波长光的聚光部件的光轴与具有最长波长的第三波长光的光轴对准。 衍射元件将第一波长光的+ 2级衍射光和第二波长光和第三波长光的+ 1级衍射光聚合成第一光电检测器,第一波长光和-1级衍射的-2级衍射光 使用第二波长光的±2级衍射光和第二波长光的±1级衍射光,将第三波长的光照射到第二光电检测器中,并将剩余的第二波长的光的-1级衍射光转换成光电检测器,并且 第三波长光作为来自光学信息记录介质的信号光。 因此,光拾取装置的总体尺寸减小。