Patent ID: 7528968

Claim:
An optical measuring machine, comprising: a screen; a movable stage; an illuminator that irradiates light on a target object mounted on the stage; a detector that detects a displacement of the stage; a first image-forming unit and a second image-forming unit that respectively form an optical image of the target object mounted on the stage on the screen; a switch that switches image-forming units used for forming the optical image on the screen between the first image-forming unit and the second image-forming unit; a storage that stores the optical image; and a half mirror provided on an optical path extending from the projection lens of the second image-forming unit to the screen, wherein the first image-forming unit comprises: an image pickup that picks up the optical image; an output unit that outputs the optical image picked up by the image pickup as digital image data; and a projecting unit that projects the optical image on the screen in accordance with the image data output by the output unit, the second image-forming unit comprises a projection lens that projects on the screen the light irradiated by the illuminator and reflected or transmitted by the target object, the storage stores the image data output by the output unit of the first image-forming unit, the first image-forming unit forms the optical image on the screen using light reflected or transmitted by the half mirror, the second image-forming unit forms the optical image on the screen using the light transmitted or reflected by the half mirror, and the switch comprises a stopper that stops irradiation of the light from either one of the image-forming units selected from the first image-forming unit and the second image-forming unit to the half mirror.