Patent ID: 7578181

Claim:
A method for correcting an irregularity data of a surface of a body of rotation obtained by rotating either one of the body of rotation or a non-contact displacement probe located at a position facing the surface of the body of rotation, comprising steps of: measuring an irregularity value of the surface of the body of rotation from a center of the rotation of the body of rotation or the center of rotation of the non-contact displacement probe with equal angular displacement; computing a surface length of the body of rotation from a measurement starting point to an arbitrary measurement point and bringing the surface length to correspond with the measured irregularity values; dividing the computed one round length of the tire into equal intervals and making each of equally divided points to be irregularity computing points for newly computing irregularity values; computing the irregularity value at each of irregularity computing points based on the irregularity data at the measurement points adjacent to irregularity computing point, and; making the irregularity values at respective computing points to be the irregularity data of the surface of the body of rotation at respective points equally spaced apart on the surface of the body of rotation.