| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide an encoder which is equipped with a signal processing technology which can generate an encoder signal by performing signal processing within a range and realize desired displacement detection accuracy, even if DC signal components, which do not contribute to the encoder signal, become larger than the AC signal. <P>SOLUTION: The encoder comprises an encoder scale 11, on which a pattern with a predetermined period, is formed and one or more detection means 12 for detecting a periodic displacement accompanied by the movement of the encoder scale 11. The encoder is provided with a signal removal means 13 for subtracting all the DC signal components which do not depend on the relative displacement of the encoder scale 11 or signal components being proportional thereto among the output signal of each detection means. <P>COPYRIGHT: (C)2006,JPO&NCIPI</p> |
