US Patent No. 9,229,306

ILLUMINATION OPTICAL SYSTEM AND PROJECTOR INCLUDING FLUOROPHORE


Patent No. 9,229,306
Issue Date January 05, 2016 
Title Illumination Optical System And Projector Including Fluorophore
Inventorship Masateru Matsubara, Tokyo (JP)
Assignee NEC DISPLAY SOLUTIONS, LTD., Tokyo (JP)

Claim of US Patent No. 9,229,306

1. A projector, comprising:
an illumination optical system;
an image formation element that spatially modulates light from the illumination optical system; and
a projection lens that projects the spatially modulated light,
wherein the illumination optical system comprises:
a light source that emits light of a first wavelength;
a fluorophore unit including a reflection region reflecting the light of said first wavelength and a fluorophore region including
a fluorophore emitting fluorescent light of a wavelength that differs from said first wavelength by irradiation of the light
of said first wavelength;

an optical element reflecting the light of said first wavelength; and
a quarter-wave plate provided on a light path between said optical element and said fluorophore unit.