Double cone stylus, touch probe, and method of calibrating double cone stylus

摘要

A double cone stylus 30 includes a shank 32 and a double cone-shaped tip 34 attached to the tip end of the shank, the double cone-shaped tip being a rotationally symmetric body obtained by rotating a triangle having a base extending along the shank around the shank as the symmetric rotation axis. The double cone stylus allows the shape of an inner wall surface of a measurement object with the inner wall surface retracted from an upper reference plane 8A to be measured from above.