US Patent 11927340 Reflective device and light source module

A reflective device and a light source module are provided. The reflective device is transparent, which includes a light entrance, a light exit, and a reflective wall between the light entrance and the light exit. The light entrance is smaller than the light exit, and the reflective wall includes an inner surface and an outer surface, the inner surface including a plurality of sawtooth structures arranged continuously, each of the sawtooth structures including a first refractive surface and a second refractive surface which are intersected with each other, two ends of each of the sawtooth structures being respectively extended toward the light entrance and the light exit. The light source module provided by the present disclosure adopts the above-mentioned reflective device, the reflective device being transparent, the inner surface of the reflective device including the plurality of sawtooth structures arranged continuously.