| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an optical encoder including a passive read head. <P>SOLUTION: The passive read head does not have a connection cable and is just an optical read head. A measurement position information indicative of a position relative to a scale is read remotely by direct line-of-sight optical transmission to a remote companion part. The remote companion part includes a light source and a sensing portion. The sensing portion may comprise a remote lens portion and a photodetector arrangement. The remote companion part is configured to optically sense intensities (brightness) of imaged regions obtained from the passive read head, and to output a plurality of signals indicative of the measurement position based on the sensed intensities (brightness). <P>COPYRIGHT: (C)2013,JPO&INPIT |
