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    • 67. 发明授权
    • Optical encorder for detection having a moving reference point
    • 具有移动参考点的用于检测的光学记录仪
    • US5981941A
    • 1999-11-09
    • US859321
    • 1997-05-20
    • Kazumasa TakataKanji NishiiKenji TakamotoMasami ItoAtsushi FukuiTomohisa Kishi
    • Kazumasa TakataKanji NishiiKenji TakamotoMasami ItoAtsushi FukuiTomohisa Kishi
    • G01D5/38G01D5/34
    • G01D5/38
    • The present invention provides an optical encoder capable of using the recesses and convexes of a movable plate and a fixed plate to accurately generate a Z phase signal in synchronism with an A/B phase signal. Phase type diffraction gratings on the moving and fixed plates including a plurality of tracks with different grating pitches cause parallel coherent beams to interfere with one another, and a light receiving part detects the intensity of light to obtain a plurality of synchronous signals with different periods. On the other hand, the light receiving part detects light spots formed by condensing elements on the movable plate to generates a single pulse per rotation as a reference position. One of the plurality of synchronous signals that has the shortest period is selected as an A/B phase signal that depends on the movement of the movable plate. The conjunction of the reference position signal and the plurality of synchronous signals is determined as a Z phase signal indicating the origin of the movable plate, thereby obtaining a Z phase signal in synchronism with one pulse of the A/B phase signal.
    • 本发明提供一种能够使用可移动板和固定板的凹凸的光学编码器,以与A / B相位信号同步地精确地生成Z相信号。 包括具有不同光栅间距的多个轨道的移动和固定板上的相位衍射光栅使平行的相干光束彼此干涉,并且光接收部分检测光的强度以获得具有不同周期的多个同步信号。 另一方面,光接收部检测由可动板上的聚光元件形成的光斑,以产生每旋转一脉冲作为基准位置。 选择具有最短周期的多个同步信号中的一个作为取决于可动板的移动的A / B相位信号。 基准位置信号和多个同步信号的结合被确定为指示可移动板的原点的Z相信号,从而获得与A / B相位信号的一个脉冲同步的Z相信号。
    • 68. 发明授权
    • Optical encoder including a plurality of phase adjusting gratings
    • 光学编码器包括多个相位调整光栅
    • US5694218A
    • 1997-12-02
    • US643433
    • 1996-05-08
    • Atsushi FukuiKanji NishiiKenji TakamotoMasami ItoKazumasa Takata
    • Atsushi FukuiKanji NishiiKenji TakamotoMasami ItoKazumasa Takata
    • G01D5/38G02B5/18G02B5/30G01B9/02
    • G01D5/38
    • An optical encoder has a light source and a diffracted light interference device including at least first and second diffraction gratings confronting each other, producing diffracted light beams in specific orders by passing light emitted from the light source through the first and second diffraction gratings, and making the diffracted light beams in the specific orders, which have passed through the diffraction gratings, interfere with each other to produce on-axis interference light beams in which the sum of the orders of the diffraction at the diffraction gratings is zero and off-axis interference light beams in which the sum of the orders of the diffraction is not zero. A phase device is adjusting the phases of the on-axis interference light beams and the off-axis interference light beams emitted from plural portions of the diffracted light interference device. A plurality of light sensors receive and detect the on-axis interference light beams and the off-axis interference light beams device. In this structure, since the on-axis interference light beams in which the sum of the orders of the diffraction at the diffraction gratings is zero and the off-axis interference light beams in which the sum of the orders of the diffraction is not zero are produced and the phases of the on-axis interference light beams and the phases of the off-axis interference light beams are made equal to each other, unwanted negation of signals is avoided, whereby the light utilization efficiency is increased.
    • 光学编码器具有光源和衍射光干涉装置,其至少包括彼此面对的第一和第二衍射光栅,通过使从光源发射的光通过第一和第二衍射光栅,以特定的顺序产生衍射光束,并且 已经通过衍射光栅的特定次数的衍射光束彼此干涉以产生在衍射光栅处的衍射级之和为零和离轴干扰之和的轴上干涉光束 其中衍射级数之和不为零的光束。 相位装置调节从衍射光干涉装置的多个部分发射的轴上干涉光束和离轴干涉光束的相位。 多个光传感器接收并检测轴上干涉光束和离轴干涉光束装置。 在这种结构中,由于衍射光栅的衍射级之和为零的衍射的次数和衍射级之和不为零的离轴干涉光束的轴上干涉光束为 使轴上干涉光束的相位和离轴干涉光束的相位彼此相等,避免信号的不希望的反转,从而提高光的利用效率。