Patent ID: 9149348
Filing Date: 2015-10-06
Classification: A61B,A61C,G01B

Abstract:
1. An intra-oral scanner for a digital impression, the intra-oral scanner having a window for limiting an acquisition range, the intra-oral scanner sequentially includes, along a light path, a three-color LED light source module; a microlens array sheet for making distribution of a light beam generated by the three-color LED light source module become uniform; a collimator lens group for collimating the light beam; a gray encoding grating plate for generating a gray encoded fringe pattern required for projection; an optical deflector for offsetting the light beam such that lights of different wavelengths have different offset distance; a projection lens group for projecting a gray encoded grating image passing through the gray encoding grating plate and the optical deflector onto a surface of an object to be measured; a first reflector for redirecting the light beam so that projection lights are emitted through the window; a second reflector and a third reflector positioned in parallel with each other with their reflective surfaces opposing to each other for ensuring a long distance transmission of the lights within a limited space; and a camera for imaging, acquiring and recording a fringe distribution on an oral cavity inner surface.