US Patent No. 9,448,416

LIGHT SOURCE DEVICE AND PROJECTION-TYPE DISPLAY DEVICE


Patent No. 9,448,416
Issue Date September 20, 2016
Title Light Source Device And Projection-type Display Device
Inventorship Hiroko Chifu, Tokyo (JP)
Motoyasu Utsunomiya, Tokyo (JP)
Assignee NEC Display Solutions, Ltd., Tokyo (JP)

Claim of US Patent No. 9,448,416

11. A light source device comprising:
a laser light source;
a fluorescent plate which has a fluorescent body that emits light by using light from the laser light source as excitation
light;

a motor which rotates the fluorescent plate;
an optical member which transmits the light from the fluorescent body while reflecting the light from the laser light source;
a diffusion plate which diffuses the light from the laser light source; and
an elastic member which interconnects the diffusion plate and the motor, wherein:
the laser light source includes a first laser light source for emitting light to excite the fluorescent body, and a second
laser light source for emitting light output from the optical member without illuminating the fluorescent body; and

the diffusion plate is disposed on an optical path from the second laser light source between the optical member and the second
laser light source;

the laser light source further includes a third laser light source for emitting the light output from the optical member without
illuminating the fluorescent body;

the diffusion plate includes a first diffusion plate disposed on the optical path which begins from the second laser light
source and which is located between the optical member and the second laser light source, and a second diffusion plate disposed
on an optical path which begins from the third laser light source and which is located between the optical member and the
third laser light source; and

the first and second diffusion plates are connected to individual elastic members, and each of the plurality of elastic members
is connected to the motor.