Patent ID: 7894077

Claim:
A multi-directional projection type moire interferometer comprising: a stage for moving a target object; an image formation part above the stage for taking a pattern image that is reflected from the target object placed on the stage; a first rotating mirror and a second rotating mirror that can each be rotated about vertical axes of respective holders to receive a pattern illumination, change the optical path of the pattern illumination, and emit the pattern illumination; a first fixed mirror and a second fixed mirror for emitting the pattern illumination emitted from the first and the second rotating mirrors, toward the target object; and a first pattern illumination generating part for emitting the pattern illumination toward the first and the second rotating mirrors and generate the pattern illumination, the first pattern illumination generating part comprising: a grating board; at least one illumination source generating illumination and installed at one side of the grating board; and first and second grating elements formed in the grating board and respectively generating the pattern illumination emitted towards the first and second rotating mirrors when illumination from the at least one illumination source passes through the grating elements.