Patent ID: 9612109
Date: 2017-04-04
CPC Classifications: G01B,G01N,G02B

Claim:
1. An inner diameter measuring device for measuring a shape of an inner surface of a cylindrical member, comprising an image pickup unit disposed on a base end side of a frame unit and for picking up an image of a forward end side, two or more cone mirror units provided on a forward end side of said frame unit, having a cone mirror with a conical reflection surface and a different vertical angle at a forward end, and a laser beam emitting unit for emitting a laser beam toward a forward end of said cone mirror, wherein said cone mirror unit is comprised of said cone mirror having a vertical angle corresponding to a measuring condition and a cone mirror holder which holds said cone mirror and has a fitting unit which is capable of fitting to the forward end side of said frame unit, wherein said cone mirror is mounted by fitting of said fitting unit on the forward end side of said frame unit, a center line of said cone mirror coincides with a center line of said laser beam emitting unit by the fitting of said fitting unit, and said laser beam is reflected at a predetermined angle with respect to the center line of said laser beam emitting unit by said cone mirror unit.