Abstract: A first light transmitting assembly mainly uniformizes light, and a second light transmitting assembly mainly collimates the light, such that the light projected to a display screen can accurately cure resin. A light source assembly includes a light emitting assembly, the first light transmitting assembly and the second light transmitting assembly. The light emitting assembly and the second light transmitting assembly are arranged on two opposite sides of the first light transmitting assembly respectively, and an outer profile of the second light transmitting assembly is of a cambered plate-like structure. Light emitted by the light emitting assembly is projected after being sequentially refracted by the first light transmitting assembly and the second light transmitting assembly. The light source assembly is mainly used for providing backlight for 3D printing.

Abstract: A 3D printer and a light source of the 3D printer adjust propagation angles of light mainly by configuring surface profiles of an incident surface and an emergent surface of a light adjusting element, so that the light can be uniformly projected into a display screen to facilitate uniform curing of a resin. The light source of the 3D printer includes a light source body and a light adjusting element, where the light adjusting element includes a first surface and a second surface opposite to each other. The first surface is a convex surface, and the second surface is a concave surface. The light source body is arranged opposite to the concave surface, and light emitted by the light source body is projected after passing through the light adjusting element. The present disclosure is mainly used for 3D printing.