| 摘要 |
To provide a position detecting device capable of easily obtaining a stable recording state without using“absence of record”upon reproducing a binary signal. The position detecting device is provided with a scale unit 10 having an absolute track 11 in which non-repetitive signals composed of binary information are recorded and an incremental track 12 in which a signal for specifying a reading section within a section of information of 1 unit for the non-repetitive signal is recorded; and within a reading section in a section of information of 1 unit for the repetitive signal specified based upon the signal recorded in the incremental track 12, each 1 unit information of the non-repetitive signal is read from the absolute track 11 by an absolute pattern detection head 21. In the absolute track 11, each 1 unit information is recorded in an effective section longer than the reading section within the section of information of 1 unit for the non-repetitive signal. |
