To provide an illumination device capable of easily forming an irradiation area and uniforming light quantity distribution, and to provide an image display device and a projector using the illumination device.
The illumination device comprises: a laser beam source 12R as a light source part of emitting coherent light; and a diffraction optical element 13R which diffracts the coherent light emitted from the light source part and causes primary diffraction light L1 as diffraction light to travel to a surface S2 to be irradiated, wherein the diffraction optical element 13R is arranged such that coherent light is made incident obliquely relative to a perpendicular line N to an incident surface S1 as the reference surface for arranging the diffraction optical element 13R and causes zero-order light L0 as light besides the diffraction light among light emitted from the diffraction optical element 13R to travel to a position besides the surface S2 to be irradiated.
| JP2019105783 | WAVELENGTH CONVERSION DEVICE, LIGHT SOURCE DEVICE, AND PROJECTOR |
| JPWO2015075891 | In-vehicle equipment and vehicles equipped with it |
| WO/2016/098859 | OPTICAL UNIT AND PROJECTOR PROVIDED WITH SAME |
TAKEDA TAKASHI
YAMAUCHI TAISUKE
| JP2004525390A | 2004-08-19 |
Osamu Suzawa
Kazuhiko Miyasaka
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