Patent ID: 7453580

Claim:
A three-dimensional image measuring apparatus comprising: an XYZ shaft transfer means mounted onto a base member; a work stage having first and second guides and a guide transfer apparatus mounted to the base member, for moving a measuring object to a measuring position and thereafter supporting it and having a predetermined reference surface set at a side thereof; an image obtaining means moving along X, Y and Z shafts by the XYZ shaft transfer means, scanning a grating image by the frequency of N times to one side of the measuring object and, at the same time, to the other side of the measuring object supported and fixed to the work stage, obtaining the grating image changed by the one side of the measuring object by N times and obtaining the grating image changed by the other side of the measuring object by N times; a light emitting means mounted to a side of the image obtaining means for generating and emitting light with a predetermined wavelength; and a control unit which, by controlling the work stage and the XYZ shaft transfer means, irradiates light generated from the light emitting means mounted to a side of the image obtaining means to the reference surface set the side of the work stage, thereafter receives the reflected light image through the image obtaining means, measures a vertical distance, thereby maintaining a focus distance between the measuring object and the image obtaining means constantly, and receives the changed grating image obtained from the image obtaining means, thereby producing the three-dimensional image.