| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an encoder, a servomotor, a servo unit, and a method for manufacturing an encoder, whereby manufacturing and so on are facilitated while resolution is improved using diffraction interference light. <P>SOLUTION: The encoder includes: a disk 110 having ring-shaped first and second tracks TA and TB with a rotation grating; and first and second detecting sections 130A and 130B fixedly arranged while facing first and second tracks, having fixed grating, and used for detecting diffraction interference light. The slits of the first track are formed as curved slits. The first detecting section facing the first track is disposed in the position where the tangential line LINEA of a slit included in the diffraction grating of the first track is parallel to the tangential line LINEB of a slit in a position facing the second detecting section. <P>COPYRIGHT: (C)2012,JPO&INPIT |
