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    • 2. 发明授权
    • Optical pick-up apparatus
    • 光学拾取装置
    • US07130259B2
    • 2006-10-31
    • US10420988
    • 2003-04-22
    • Shouichi TakasukaKouji IseHiroyuki IshidaMasayuki Ono
    • Shouichi TakasukaKouji IseHiroyuki IshidaMasayuki Ono
    • G11B7/135
    • G11B7/1353G11B7/1275G11B2007/0006
    • An optical pick-up apparatus includes: a semiconductor laser light source that generates an optical beam; a diffraction grating that divides the optical beam into a main beam and side beams; an optical element that guides the main beam and the side beams that are generated by the diffraction grating onto an optical information medium; and a photodetector that detects a signal from reflected light reflected from the optical information medium. The semiconductor laser light source is configured with a 2-wavelength semiconductor laser device in which a semiconductor laser chip that generates an optical beam having a wavelength of λ1 and a semiconductor laser chip that generates an optical beam having a wavelength of λ2 are integrated into one chip or are arranged in proximity to each other. The diffraction grating has one grating period Λ by which each of the optical beams having the wavelength λ1 and the optical beam having the wavelength λ2, which are generated by the 2-wavelength semiconductor laser device, is divided into a main beam and side beams. The apparatus is applicable to two kinds of optical information media having different track pitches.
    • 光学拾取装置包括:产生光束的半导体激光光源; 将光束分成主光束和侧光束的衍射光栅; 光学元件,其将由所述衍射光栅产生的所述主光束和所述侧光束引导到光信息介质上; 以及光检测器,其检测从光信息介质反射的反射光的信号。 半导体激光光源配置有2波长半导体激光器件,其中产生具有λ1波长的光束的半导体激光器芯片和产生波长为λ2的光束的半导体激光器芯片被集成 形成一个芯片或彼此靠近地布置。 衍射光栅具有一个光栅周期λ,由λ波长λ和2波长λ2的光束由2波长半导体激光装置产生的每个光束被分成主光束和一侧 梁。 该装置适用于具有不同轨道间距的两种光学信息介质。