| 摘要 |
PURPOSE:To eliminate the need to provide a track constituting a significant bit by moving a rotary disk by a fine angle and identifying whether or not detection data of a sensor is data within a significant area. CONSTITUTION:The optical sensor 5 is put in operation to read data regarding whether or not a slit groove 3a is formed at the angle position of the rotary disk 1 at a stop position 1. Simultaneously, a driving means for a cam shaft 2 is driven to drive and rotate the rotary disk 1. The optical sensor 5 is operated at specific time intervals (T) set by a timer to rotate the rotary disk 1 by a specific angle in the order of positions 2, 3, 4..., thereby reading data at each position. Then, a comparison is made to check whether or not current data coincides with last data, and when not, the data is processed as insignificant data and the read of data is carried on. Further, when data is coincident continuously three times, the data is judged as a true value.
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