Light source unit for use in projector, has cooling device representing cooling body whose surface area is applied with phosphor, aluminum and silver, and mirror coupled between excitation beam sources and optical collimation device

摘要

The source unit (8) has a cooling device representing a cooling body (10) whose surface area is thermally applied with a first luminescent material (12) e.g. aluminum and silver. An optical collimation device (14) e.g. compound parabolic concentrator and compound elliptic concentrator, is coupled between the material and a mirror (18) i.e. dichroic mirror. The mirror is coupled between excitation beam sources (16) i.e. LED, and the collimation device. A moving device moves the body such that second and third materials are exposed to radiation of the sources during time durations, respectively. An independent claim is also included for a projector comprising an optical filtering apparatus coupled between a mirror and an indicator device for displaying light.