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    • 1. 发明授权
    • Optical pickup using a waveguide
    • 使用波导的光学拾取器
    • US4861128A
    • 1989-08-29
    • US151964
    • 1988-02-03
    • Sachiko IshikawaAkira Arimoto
    • Sachiko IshikawaAkira Arimoto
    • G02B6/122G11B7/135
    • G11B7/1384
    • An optical pickup comprising a semiconductor laser, a first waveguide for leading light emitted by the semiconductor laser to recording medium and coupling again light returning from the recording medium; splitting element for separating the light returning from the recording medium from the first waveguide path; and a second waveguide propagating light returning from the recording medium and separated by the splitting element; wherein light going towards the recording medium and light returning from the recording medium propagate separately in the first and the second waveguide so that the utilization efficiency of the light is increased.
    • 一种包括半导体激光器的光学拾取器,用于将由半导体激光器发射的光引导到记录介质并再次耦合从记录介质返回的光的第一波导; 分离元件,用于将从记录介质返回的光与第一波导路径分离; 以及第二波导传播从记录介质返回并被分离元件分离的光; 其中朝向记录介质的光和从记录介质返回的光分别在第一和第二波导中传播,使得光的利用效率增加。
    • 2. 发明授权
    • Optical pickup using waveguide
    • 使用波导的光学拾取器
    • US4929044A
    • 1990-05-29
    • US193594
    • 1988-05-13
    • Akira ArimotoSachiko IshikawaKeiji Kataoka
    • Akira ArimotoSachiko IshikawaKeiji Kataoka
    • G11B7/12G11B7/135
    • G11B7/1353G11B7/1245
    • An optical pickup comprises at least a semiconductor laser, a waveguide optically coupled with the semiconductor laser for propagating therein a light from the semiconductor to guide it to a recording medium and a light deflector element provided on the waveguide for deflecting the light propagated in the waveguide by means of a surface acoustic wave. A multi-mode oscillation laser capable of stably operating in longitudinal modes the number of which is not larger than 5 is used as the semiconductor laser. The semiconductor laser is disposed in proximity to the waveguide at a distance not larger than 1 .mu.m, thereby inputting the light from the semiconductor laser into the waveguide with a high efficiency. A frequency applied to the light deflector element may be changed upon change between a read-out state and a write-in state so that a light spot on the recording medium is held at a predetermined position (track or address). In the case where a grating is used as a light coupling element between the waveguide and the exterior thereof, a hologram grating is disposed in a path of the light derived through the light coupling grating from the waveguide to the exterior thereof so that a chromatic aberration produced at the light coupling grating due to a change in wavelength of the semiconductor laser is cancelled by that produced at the hologram grating.
    • 光学拾取器包括至少半导体激光器,与半导体激光器光学耦合的波导,用于在其中传播来自半导体的光以将其引导到记录介质,以及设置在波导上的光偏转元件,用于偏转在波导中传播的光 借助于表面声波。 作为半导体激光器,使用能够稳定地以纵向模式操作的多模振荡激光器,其数量不大于5。 半导体激光器以不大于1μm的距离布置在波导附近,从而将来自半导体激光器的光以高效率输入到波导中。 在读出状态和写入状态之间变化时,施加到光偏转元件的频率可以改变,使得记录介质上的光点保持在预定位置(轨道或地址)。 在将光栅用作波导及其外部之间的光耦合元件的情况下,全息光栅设置在通过光耦合光栅从光波导到其外部的光的路径中,使得色差 由于半导体激光器的波长的变化,在光耦合光栅处产生的光线被全息光栅所产生的消除。