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    • 9. 发明授权
    • Optical information recording and reproducing device
    • 光信息记录和再现装置
    • US5428595A
    • 1995-06-27
    • US9911
    • 1993-01-27
    • Yoshio YoshidaHideaki SatoYukio KurataHiroyuki YamamotoNobuo OgataKatsuhiro Kubo
    • Yoshio YoshidaHideaki SatoYukio KurataHiroyuki YamamotoNobuo OgataKatsuhiro Kubo
    • G11B7/09G11B7/135G11B17/32
    • G11B7/1353
    • An optical information recording and reproducing device is provided. The device includes a light source for emitting a light beam, a first diffraction element for splitting the light beam into at least three diffracted beams, an optical system guiding the diffracted beams to a recording medium, and a second diffraction element including at least one division line and a diffraction surface from which the diffracted beams are diffracted. The diffraction surface is divided into at least two regions by the division line or lines. One of the division lines is at a predetermined angle against the direction of a track on the recording medium, and the regions split each of the diffracted beams into at least two parts to diffract the parts in different directions. The device also includes an optical detecting element for detecting the light beams diffracted with the second diffraction element.
    • 提供了一种光信息记录和再现装置。 该装置包括用于发射光束的光源,用于将光束分成至少三个衍射光束的第一衍射元件,将衍射光束引导到记录介质的光学系统,以及包括至少一个分割部分的第二衍射元件 线衍射面和衍射光束衍射的衍射面。 通过划分线或线将衍射面分成至少两个区域。 分割线之一与记录介质上的轨道的方向成预定角度,并且区域将每个衍射光束分成至少两个部分,以在不同方向上衍射该部分。 该装置还包括用于检测与第二衍射元件衍射的光束的光学检测元件。