Patent ID: 9097504
Filing Date: 2015-08-04
Classification: G01B

Abstract:
1. A shape measuring machine comprising: a scanning probe that performs scanning measurement by using a tip sphere disposed at a tip of a stylus attached to one end of the scanning probe, the tip sphere being configured to come into contact with an object to be measured; a movably-disposed slider that supports the scanning probe at another end of the scanning probe opposite to the tip sphere; a scale unit that detects a displacement of the slider; a tip sphere displacement detection unit that detects a displacement of the tip sphere of the scanning probe with respect to a junction between the scanning probe and the slider; and a calculation unit that calculates a measurement value from the displacement of the slider detected by the scale unit and the displacement of the tip sphere detected by the tip sphere displacement detection unit, wherein the calculation unit comprises: a correction filter that outputs a correction value, the correction value being obtained by correcting the displacement of the tip sphere detected by the tip sphere displacement detection unit based on an inverse characteristic of a frequency transfer characteristic from the scale unit to the tip sphere; and an adder that calculates the measurement value by adding the displacement of the slider detected by the scale unit and the correction value.