| 摘要 |
PROBLEM TO BE SOLVED: To provide an absolute encoder advantageous with respect to time required for arithmetic.SOLUTION: The absolute encoder includes: a scale SCL in which a plurality of marks corresponding to code strings representing absolute positions are arranged at a first pitch in a first direction; a detector PDA which detects the plurality of marks with a width corresponding to the code strings by a plurality of photoelectric transducers arranged at a pitch smaller than the first pitch in the first direction; and a processing unit which obtains an absolute position in the first direction of the scale SCL or the detector PDA on the basis of an output of the detector PDA. The processing unit quantizes signals of marks outputted from the detector PDA to generate a data string, generates first position data corresponding to the code strings having the first pitch as an array unit, generates second position data corresponding to a phase of a signal obtained by reducing values of signals of marks at both ends not detected throughout in a breadthwise direction by the detector PDA, out of the signals of the marks, and combines the first position data and the second position data to generate data representing the absolute position. |
