Optical projection module and fan assembly thereof

摘要

An optical projection module and a fan assembly thereof. A casing comprises at least one heat-dissipation vent. An image projection module is disposed in the casing to create an image. A light source provides light to the image projection module. A fan disposed in the heat-dissipation vent comprises a hub and a plurality of primary blades encircling the hub. Adjacent primary blades overlap in an axial direction. A region formed by the primary blades and the hub blocks a light from transmitting through the heat-dissipation vent.