Illumination system for improving collimation efficiency based on Fresnel lens

The present invention discloses an illumination system for improving the collimation efficiency based on a Fresnel lens. The illumination system comprises light sources with different wavelengths, each light source is provided with a convergent lens, and the light rays emitted by a first light source, a fifth light source and a third light source pass through the convergent lenses and first dichroscopes respectively, and then the light rays at different angles are collimated through the Fresnel collimating lens; the collimated light rays pass through a second dichroscope , the light rays emitted by the fourth light source pass through the convergent lens and then pass through the second dichroscope, the second dichroscope enables the two kinds of light rays to form a light beam and converges the light beam into a dodging system, and the light beam sequentially passes through the dodging system, a light valve system and a projection system and is finally projected on a screen. 本发明公开了一种基于菲涅尔透镜提高准直效率的照明系统，包括不同波长