| 摘要 |
PROBLEM TO BE SOLVED: To allow eccentricity to the rotating shaft of a scale board to some extent by correcting angle errors due to the eccentricity to the rotating shaft of the scale board, in a rotary encoder. SOLUTION: The rotary encoder comprises the scale board giving an angle scale, and a pair of CCD linear sensors obtaining a pair of reading angles by reading the angle scale of a symmetric position of the scale board. In each proper rotation angle of the scale board of the rotary encoder, the averageΨand the differenceΦof the pair of the reading angles are calculated, and the averageΨand the differenceΦsatisfy the relational:Φ=Asin(Ψ+B)+C, and eccentric factors A, B, C are calculated and are stored to a storing means, in advance. In measuring the actual angles, the measured angle values are corrected by using eccentric factors including the eccentric factors A, B, C. COPYRIGHT: (C)2007,JPO&INPIT
|
