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    • 10. 发明授权
    • Photoelectric encoder
    • 光电编码器
    • US08325066B2
    • 2012-12-04
    • US13025198
    • 2011-02-11
    • Yoshiaki Kato
    • Yoshiaki Kato
    • H03M1/22
    • G01D5/24476
    • A photoelectric encoder includes: a scale having a grating formed with a predetermined period Ps; and a detector head being movable relative to the scale and including a light source and a light receiving unit. In a configuration where light receiving elements in the light receiving unit output N-points light and dark signals (N is an integer of 3 or more), and where phases of the N-points light and dark signals are detected by a least-squares method to fit a sinusoidal function with fixed period to N-points digital signals digitized from the N-points light and dark signals, an N-points light and dark signal period P is set at an integral multiple of a data-point interval w of the N-points digital signals, and an overall length M of the light receiving elements is set at an integral multiple of the N-points light and dark signal period P. Thereby, position detecting errors occurring due to a stain of the scale and/or a defect in the grating can be reduced by simple computing.
    • 光电编码器包括:具有形成有预定周期Ps的光栅的刻度; 以及检测器头,其相对于刻度尺可移动,并且包括光源和光接收单元。 在光接收单元中的光接收元件输出N点光暗信号(N为3以上的整数)的情况下,通过最小二乘法来检测N点光暗信号的相位 将具有固定周期的正弦函数拟合为从N点光暗信号数字化的N点数字信号的方法,将N点光暗信号周期P设定为数据点间隔w的整数倍 N点数字信号和光接收元件的总长度M被设定为N点光暗信号周期P的整数倍。由此,由于刻度和/ 或者可以通过简单的计算来减少光栅中的缺陷。