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US08837264B2 Optical information device, optical disc driving device, optical information recording device, optical information reproducing device, gap control method, and optical pickup 有权
光信息设备，光盘驱动设备，光信息记录设备，光信息再现设备，间隙控制方法和光拾取

Optical information device, optical disc driving device, optical information recording device, optical information reproducing device, gap control method, and optical pickup
Abstract:
An optical information device is provided with a first scattering medium (9), a second scattering medium (10), a third scattering medium (11); a diffraction element (4) which generates a plurality of light beams; an objective lens (6) which guides, to the first scattering medium (9) and to the third scattering medium (11) out of the first scattering medium (9), the second scattering medium (10), and the third scattering medium (11), two light beams out of the plurality of the light beams; and an arithmetic circuit (17) which detects a gap interval between the first scattering medium (9) and the third scattering medium (11), and an information medium (12), based on a change in an amount of reflected light from the first scattering medium (9) and from the third scattering medium (11).
Abstract(Chinese):

光信息装置设置有第一散射介质（9），第二散射介质（10），第三散射介质（11）。 产生多个光束的衍射元件（4）; 从第一散射介质（9）向第一散射介质（9）和第三散射介质（11）引出第二散射介质（10）和第三散射介质（6）的物镜（6） 11），多个光束中的两个光束; 以及检测第一散射介质（9）和第三散射介质（11）之间的间隙的运算电路（17），以及基于来自第一散射介质（9）的反射光的变化的信息介质 散射介质（9）和第三散射介质（11）。

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