Illumination system

Abstract

An illumination system for use in a projection device is provided. The illumination system comprises a first light source, a second light source, an optical device, a wavelength transformer and a first dichroic mirror. The first light source and the second light source emit a first light beam and a second light beam respectively. The optical device defines a main optical axis and focuses the first light beam and the second light beam on a first focal point and a second focal point respectively, wherein the first focal point and the second focal point are disposed on two opposite sides of the main optical axis respectively. The wavelength transformer is disposed on the second focal point and transforms the second light beam into a third light beam. The first dichroic mirror is disposed between the light sources and the optical device. The first light beam and the second light beam are allowed to pass through the first dichroic mirror, and the third light beam is reflected by the first dichroic mirror. After being reflected by the first dichroic mirror, the third light beam is focused onto the first focal point.

Dependencies are inferred from the claim text.