Patent ID: 8330097
Filing Date: 2012-12-11
Classification: G01D

Abstract:
1. An angular correction method for a rotary encoder that includes: a dial having angular graduation slits formed therein; a detector, reading angular graduation slit image positions of light transmitted through the angular graduation slits, and a step of determining the most probable values R′, A where P P R is a distance between the center A A and of calculating residual r i for the i-th angular gradation slit image position defined by a residual curve determining step of determining and recording a residual r between a position computed from the formula P a slope computing step of computing a tangential slope f′(x a step of calculating the value of (P a step of calculating a correction quantity C and calculating (P i +C i ) for each of the angular graduation slit image positions; and a step of performing the regression analysis using (P