Three-dimensional intraoral scanning apparatus using a tunable lens and the piezoelectric element of the pattern-based module

The present invention relates to a three-dimensional oral scanning device for the digital impression to obtain a three-dimensional image by processing a two-dimensional image obtained by photographing a subject having in three-dimensional-shaped mouth, which converts the incident parallel light as the structured light pattern mask; That the mechanical vibration to the surface caused by the applied AC voltage the piezoelectric plate; And a power supply for applying an AC voltage to the piezoelectric plate, the piezoelectric plate is characterized in that the mechanical vibration generated on the surface to move the mask pattern in the longitudinal direction of the piezoelectric plate. According to the invention, the oral device can scan a small noise and vibration generated advantage by moving the mask pattern as an electrical method. In another aspect, the present invention, there is an advantage to electrically control the focal length of structure of light incident to the tooth to more precisely measure the depth of the teeth.