Apparatus for 3D printing comprising an hybrid lighting system

A photo-curing 3D printing apparatus with a hybrid lighting system at a constant wavelength and variable power and speed, wherein said apparatus includes:

• a tank for receiving a photocurable liquid material;
• a first light source for generating a light beam and related optical devices of conditioning the light beam, for the emission and processing of the light beam for photo-curing a photocurable liquid material in the tank to form an object in a build space, wherein said light beam has a predetermined wavelength and a first linear polarization oriented according to a certain angle;
• a second light source for generating a projection of light images and project one or more light images and related optical devices of conditioning the one or more second light images, for the emission and processing of the one or more light images for photo-curing the photocurable liquid material in the tank to form said object, wherein said one or more light images have a wavelength equal to that of said light beam and a second linear polarization different from the first polarization and oriented according to an angle orthogonal to that of said light beam;
• a polarizer arranged in the path of said light beam and said one or more light images towards the tank, wherein said polarizer is adapted to polarization-couple said first light beam and said one or more light images, to obtain a coaxiality while maintaining the same wavelength;
• wherein
• at least one of said light sources has a variable power and is associated with a deflection means of the related light beam, wherein said deflection means have a variable speed, power and speed of said deflection means being controlled by a predictive software as a function of the required time for the photo-curing and for imparting the same energy density to each part of said object, wherein a conditioning, expansion and/or focusing optical group is arranged distal of said polarizer and proximal of said build space, which is adapted to the conditioning, the combined expansion and/or focusing of said light beam and said one or more light images polarization-coupled to each other.