Patent ID: 8754936

Claim:
A three dimensional shape measurement apparatus comprising: a first illumination section including a first light source unit generating a light and a first grating unit changing the light generated by the first light source unit into a first grating pattern light having a first grating pattern, the first illumination section illuminating the first grating pattern light onto a measurement target in a first direction; a second illumination section including a second light source unit generating a light and a second grating unit changing the light generated by the second light source unit into a second grating pattern light having a second grating pattern, the second illumination section illuminating the second grating pattern light onto the measurement target in a second direction different from the first direction; and a grating transfer unit transferring the first grating unit in a first inclined grating transfer direction that is inclined from an extension direction (y) of the first grating pattern of the first grating unit and an arrangement direction (x) of the first grating pattern of the first grating unit and simultaneously transferring the second grating unit in a second inclined grating transfer direction that is inclined from an extension direction (v) of the second grating pattern of the second grating unit and an arrangement direction (u) of the second grating pattern of the second grating unit, wherein a plane on which the first grating pattern is disclosed and a plane on which the second grating pattern is disposed are inclined with respect to each other, and an angle between the arrangement direction (x) of the first grating pattern and the first inclined grating transfer direction is θ1, a transfer distance of the first grating unit is ‘d’ in the first inclined grating transfer direction, and an equivalent grating transfer distance of the first grating unit is d/tan θ1; and an angle between the arrangement direction (u) of the second grating pattern and the second inclined grating transfer direction is θ3, a transfer distance of the second grating unit is ‘d’ in the second inclined grating transfer direction, and an equivalent grating transfer distance of the second grating unit is d/tan θ3.