Patent ID: 9341459
Filing Date: 2016-05-17
CPC Classification: G01B

Claim Text:
1. A form measuring apparatus comprising: a probe having a tip configured to measure a measured object; a driver configured to move the probe; a probe coordinate detector configured to detect coordinates of the probe; a deflection vector detector configured to detect a deflection vector of the probe; an angle calculator configured to calculate an angle created between a direction of the deflection vector and a predetermined direction; a tip coordinate calculator configured to calculate the coordinates of the tip based on the coordinates and the deflection vector of the probe; a controller configured to execute a first scanning control, causing the driver to move the probe such that the tip scans along an inclined surface of a V groove to approach a center of the V groove, the controller further configured to execute a second scanning control, causing the driver to move the probe such that the tip scans along the inclined surface of the V groove to approach the center of the V groove from a side opposite that of the first scanning control; a threshold value-correspondent coordinate obtainer configured to obtain, as first coordinates, coordinates of the tip where the angle has changed to exceed a first threshold value during execution of the first scanning control and obtaining, as second coordinates, coordinates of the tip where the angle has changed to exceed a second threshold value during execution of the second scanning control; and a V groove center calculator configured to calculate coordinates of the V groove center based on the first coordinates and the second coordinates.