Encoder, driving apparatus, method for calculating absolute position, and method for manufacturing encoder

摘要

An encoder includes a position data obtainer that obtains superordinate data representing a position of a moving body in a superordinate section and subordinate data representing a position in a subordinate section repeated in a superordinate section with higher resolution than that of the superordinate data, a storage in which a correction value that can correct a deviation amount occurring in the superordinate data against the subordinate data is recorded to be associated with an absolute position with resolution nearly equal to that of the superordinate data, a corrector that obtains the correction value from the storage and corrects the superordinate data, and a section identifier that identifies, based on the superordinate data corrected by the corrector and the subordinate data when the superordinate data is obtained, the subordinate section in which the subordinate data is obtained against the superordinate section.

主权项

1. An encoder comprising:
a position data obtainer configured to obtain superordinate data representing a position of a moving body in a superordinate section in which the moving body is capable of moving and subordinate data representing a position of the moving body in a subordinate section repeated in the superordinate section with higher resolution than that of the superordinate data; a storage in which a correction value capable of correcting a deviation amount generated in advance, based on the deviation amount occurring in the superordinate data against the subordinate data and measured in advance, is recorded to be associated with an absolute position with lower resolution than that of the subordinate data of the moving body; a corrector configured to obtain, based on an absolute position with the low resolution when the superordinate data is obtained by the position data obtainer, a correction value associated with the absolute position from the storage and to correct the superordinate data based on the correction value; and a section identifier configured to identify, based on the superordinate data corrected by the corrector and the subordinate data when the superordinate data is obtained, the subordinate section in which the subordinate data is obtained against the superordinate section.