Patent attributes
The invention was made to provide a light source unit which can enhance the utilization efficiency of the dichroic prism which emits light that is emitted from a plurality of light sources in a direction which is parallel to an optical axis and a projector which employs the light source. The light source unit has a first light source, a second light source and a third light source which have different colors and includes a substantially cubical dichroic prism which combines light from the respective light sources for emission thereof. One of surfaces which intersect an optical axis of the dichroic prism is made to constitute a first incident surface, a surface which faces the first incident surface is made to constitute an emitting surface, and side surfaces are made to constitute a second incident surface and a third incident surface, respectively. The first light source is disposed in the vicinity of the first incident surface, the second light source is disposed in the vicinity of the second incident surface, and the third light source is disposed in the vicinity of the third incident surface, and the first incident surface, the second incident surface and the third incident surface are made up of filters which let light from the first light source, the second light source and the third light source pass through and reflect light of all other colors.
