Patent ID: 7383143
Filing Date: 2008-06-03
Classification: G01B

Abstract:
1. A correction method for correcting a measurement error in data obtained when a stylus tip of a stylus of a measurement apparatus that moves following a height of a workpiece traces the workpiece along a measurement axis, the measurement error having occurred due to stylus movement in a correction target plane defined by the measurement axis and a height direction, and the measurement error targeting a shift of a position of the stylus tip, corresponding to the position of the stylus tip in the height direction in the correction target plane, the method comprising: a calibration measurement process of obtaining calibration measurement data that includes shift information on the position of the stylus tip, corresponding to the position of the stylus tip in the height direction while the stylus is moved in the correction target plane; and a correction-parameter setting process of simultaneously with the calibration measurement process obtaining one or more correction parameter values optimal to correct the shift information on the position of the stylus tip, included in the calibration measurement data obtained in the calibration measurement process, for each of a predetermined number of sectors obtained in advance by dividing a measurement range in the height direction, wherein a division Count N in the measurement range in the height direction is set to a value between 10 and 50.