Patent ID: 9322677
Filing Date: 2016-04-26
CPC Classification: G01D

Claim Text:
1. A position detecting device comprising: a recording medium provided with a first recording track in which a non-repetitive signal composed of binary information is recorded and a second recording track 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 information reading means comprising a first detection head and a second detection head, wherein the information reading means reads each 1 unit information of the non-repetitive signal from the first recording track by using the first detection head in the reading section within a section of information of 1 unit for the non-repetitive signal specified based upon the signal recorded in the second recording track by the second detection head, wherein in the first recording track, 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, and wherein the first recording track is provided with an invalid section that records information different from the information recorded in the effective section and is located at a border portion between sections in which non-repetitive signals composed of the same binary information are continuously recorded.