Illumination device and image display apparatus

摘要

An illumination device includes: an excitation light source that emits excitation light having a first wavelength; a fluorescent substance that, when irradiated with the excitation light, emits light having a second wavelength longer than the first wavelength and transmits a part of the excitation light, and thereby multiplexes and emits the transmitted excitation light having the first wavelength and the emitted excitation light having the second wavelength; and a driving unit that moves an irradiation position of the excitation light in the fluorescent substance with the passage of time.

主权项

1. A light source device comprising:
an excitation light source configured to emit excitation light having a first wavelength range; a single rotatable fluorescent portion configured to include:
a fluorescent substance that is formed along a circumference of a substrate and which, responsive to being irradiated with the excitation light, emits emission light having a second wavelength range which is different from the first wavelength range, anda reflective portion that reflects the emission light emitted from the fluorescent substance; an optical collimator configured to convert reflection light reflected by the reflective portion into substantially parallel light; and a reflection preventing portion that is provided at an incidence side of the excitation light of the fluorescent substance and prevents the excitation light from being reflected.