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    • 94. 发明授权
    • Optical information processing apparatus
    • 光信息处理装置
    • US4815058A
    • 1989-03-21
    • US920423
    • 1986-10-20
    • Shigeru NakamuraYoshito Tsunoda
    • Shigeru NakamuraYoshito Tsunoda
    • G06K15/12G11B7/09G11B7/125H04N1/40H04N1/405G11B7/00
    • H04N1/40037G06K15/1204G11B7/0908G11B7/126
    • An optical information processing device comprises a semiconductor laser, and an optical system including an imaging lens having chromatic aberration for focusing laser light emitted by the semiconductor laser in the form of a spot on an information recording surface. The imaging lens serves for focusing the laser light at different positions along the optical axis for different wavelengths. The information processing device also includes an apparatus for producing relative displacements between the spot and the information recording surface, and an apparatus for varying the wavelength of the light emitted by the semiconductor laser with the device being characterized in that the imaging position of the spot is displaced along the optical axis depending on variations in wavelength of the light emitted by the semiconductor laser and the chromatic aberration of the imaging lens. The focusing control can be effected by driving the wavelength changing apparatus by using focal point detection signals. Further, it is possible to effect multigrade recording by driving the wavelength changing apparatus by multigrade information signals.
    • 光学信息处理装置包括半导体激光器和包括具有色差的成像透镜的光学系统,用于将由半导体激光器发射的激光以点的形式聚焦在信息记录表面上。 成像透镜用于将激光沿着不同波长的光轴聚焦在不同位置处。 所述信息处理装置还包括用于产生所述光斑和所述信息记录表面之间的相对位移的装置,以及用于改变所述半导体激光器发射的光的波长的装置,其特征在于,所述光点的成像位置为 取决于由半导体激光器发射的光的波长的变化和成像透镜的色差而沿着光轴移位。 可以通过使用焦点检测信号驱动波长改变装置来实现聚焦控制。 此外,可以通过多波段信息信号驱动波长改变装置来实现多级记录。