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    • 6. 发明授权
    • Optical pick-up apparatus and divergent angle-converting element
    • 光学拾取装置和发散角转换元件
    • US07289415B2
    • 2007-10-30
    • US10976844
    • 2004-11-01
    • Kiyono IkenakaShinichiro SaitoYuichi Atarashi
    • Kiyono IkenakaShinichiro SaitoYuichi Atarashi
    • G11B7/00
    • G11B7/1376G11B7/1275G11B7/1353G11B7/1374G11B7/139G11B7/13922G11B2007/0006
    • An optical pickup apparatus comprising: a first light source emitting first light flux having wavelength λ1 (380 nm≦λ1≦450 nm); a second light source emitting second light flux having wavelength λ2 (600 nm≦λ2≦700 nm); a third light source emitting third light flux having wavelength λ3 (750 nm≦λ3≦800 nm); a first divergent angle-converting element through which the first light flux passes; a second divergent angle-converting element through which the second light flux and the third light flux pass; and an objective optical element through which the first, second, and third light fluxes pass. Optical magnification m2 of the second divergent angle-converting element for the second light flux and optical magnification m3 of the second divergent angle-converting element for the third light flux are different from each other.
    • 一种光学拾取装置,包括:第一光源,发射波长为λ1(380nm <λ1 <= 450nm)的第一光束; 发射波长为λ2(600nm <=λ2 <= 700nm)的第二光束的第二光源; 发射波长为λ3(750nm <λ3 = 800nm)的第三光束的第三光源; 第一发光角转换元件,第一光束通过该第一发散角转换元件; 第二发光角转换元件,第二光束和第三光束通过该第二发散角转换元件; 以及第一,第二和第三光束通过的物镜光学元件。 用于第二光束的第二发散角转换元件的光学倍率m 2和用于第三光束的第二发散角转换元件的光学倍率m 3彼此不同。