Patent ID: 6108090
Filing Date: 2000-08-22
Classification: G01B

Abstract:
A three-dimensional shape measuring apparatus using a confocal imaging system comprising:a confocal imaging system which comprises a scanning confocal optical system that scans an object with one or more confocal optical systems mechanically or optically to obtain a two-dimensional confocal image or an arrayed confocal optical system consisting of a plurality of two-dimensionally arrayed confocal optical systems to obtain a two-dimensional confocal image, and a two-dimensional photoelectric sensor for converting the two-dimensional image formed thereon by the confocal optical system into an output signal;a device configured to change the relative distance in the Z direction between the object and an object-position-in-focus; andan image processor which calculates the three-dimensional shape of the object from the output signal obtained as to the two dimensional confocal images acquired at different relative distances in the Z direction between the object and the object-position-in-focus due to the change in the relative distance by the device,wherein said device comprises,a transparent flat plate including a material having an electrooptic effect to change the refractive index of the transparent flat plate according to a voltage applied thereto, said transparent flat plate being disposed between the object and the object-position-in-focus and providing the change in relative distance in the Z direction, anda voltage generator for applying the voltage to the transparent flat plate.