Patent attributes
An interaxis-angle correction method comprising: a reference sphere measurement step of scanning, with the sensor, a reference sphere located on the table, in the measurement-axis direction at a translation-axis-direction position on the reference sphere to acquire measurement-axis-direction contour information, and performing the scanning at a plurality of different translation-axis-direction positions on the same reference sphere, with the table being linearly translated; a peak detection step of detecting a peak point in the measurement-axis-direction contour information, and performing the detection for each set of measurement-axis-direction contour information; an error information acquisition step of obtaining information related to the inclination of an actual straight line based on each peak point with respect to an ideal straight line; a correction information acquisition step of obtaining correction information for correcting a measurement error related to the position in the measurement-axis direction, caused by the inclination of the actual straight line; and a correction step.
