The present invention provides an imaging system of a photo-curing 3D printing device. The imaging system comprises a light source, a liquid crystal panel, a first polarized light filter, a second polarized light filter, a focusing lens array, a projection lens, and a controller. The imaging system is characterized in that the focusing lens array is disposed on a light incoming side of the liquid crystal panel; each focusing lens of the focusing lens array is corresponding to each pixel of the liquid crystal panel; each focusing lens can gather light beams irradiating to the corresponding pixels, so that the light beams penetrate a light transmission region of the pixels as much as possible. A deflection lens is arranged on a light outgoing side of the liquid crystal panel; the deflection lens can deflect around at least one rotation axis perpendicular to an optical axis of the imaging system, so as to finely tune positions of images of the light beams projected to the surface of a light-sensitive material. The controller commands the light source to expose for multiple times and commands the deflecting lens to deflect in exposure each time, so as to project the images of the light beams exposed each time to different positions of the surface of the light-sensitive material.

Provided is imaging optical system, including: a first lens array including a plurality of lens rows each having a plurality of lenses arrayed in main array direction, the plurality of lens rows arranged in sub-array direction; and a second lens array including a plurality of lens rows each having a plurality of lenses arrayed in main array direction, the plurality of lens rows being arranged in sub-array direction. The imaging optical system forms an erect image of object in main array cross section, and forms an inverted image of object in sub-array cross section. At least one of first and second lens arrays includes at least one of a scattering and light-shielding portions arranged between adjacent lens rows. D/Rs0.2 is satisfied, where D represents length of at least one of scattering and light-shielding portions in sub-array direction, and Rs represents an effective diameter of imaging optical system in sub-array direction.

Compact hybrid developing machine that exposes a photosensitive substrate (1) using an LED or LCD display (2,3) wherein the substrate (1) is placed in direct contact with the image generating layer (colour generating layer+channelling layer) of the display (2,3). When the display is of LCD technology, the filters (21) of the colour generating layer are placed closer to the substrate (1) than the liquid crystal layer (22). In both types of display (2,3), a channelling layer is installed within the image generating layer, for example, a black matrix (4) of opaque elements. When using an LCD display (2), this may have a unifying filter (24) or a black translucent filter (25) before the light diffusing layer.