Pattern projector using superposition of double microlens arrays for hybrid 3D endoscope

This work reports the superposition of double microlens arrays (MLAs) to generate high-density irregular dot pattern projector for hybrid three-dimensional endoscope. MLAs were fabricated on a large scale with thermoplastic photoresist (PR) with Teflon coating and additional parylene coating to have high fill-factor and curvature. Fabricated MLAs were aligned with dynamic rotation between them to generate high-density diffraction pattern with uniformity using monochromatic laser light source. With projected structured laser pattern, 3D object with no texture on its surface was able to calculate the gradually changing disparity values along the object surface.