Patent ID: 7363181

Claim:
A straightness correcting method for a surface texture measuring instrument provided with a detector that detects a surface texture of a measurement work, a drive unit that moves the detector relatively to a measurement direction, and a detector posture change mechanism that changes the detector in posture, comprising: a correction data storage step of storing, to a storage device, detector correction data derived for a plurality of movement positions of the drive unit in relation to each of different postures set to the detector to take; a measurement data acquisition step of acquiring, at measurement, as measurement data, movement positions of the drive unit and a detection amount of the detector while driving the drive unit in a state in which the detector is set by the detector posture change mechanism to a posture corresponding to a measurement surface of the measurement work, and in a state in which the detector is made capable of detecting a surface texture of the measurement surface of the measurement work; and a correction calculation step of reading out from the detector correction data in the storage device a posture that is in agreement with or in substantial agreement with the posture of the detector at measurement, and correcting the measurement data using detector correction data associated with the posture read out from the storage device.