Patent ID: 8684582

Claim:
A solar simulator performing irradiation of artificial sunlight on an irradiation-target surface, the solar simulator comprising: a first light source emitting first light; a first optical filter adjusting a light emission spectrum of the first light emitted; a second light source emitting second light different from the first light; a second optical filter adjusting another light emission spectrum of the second light emitted; light selecting means selecting a short wavelength component of the first light whose light emission spectrum is adjusted and a long wavelength component of the second light whose light emission spectrum is adjusted, and emitting the short wavelength component and the long wavelength component that are selected; light transmitting means transmitting the short wavelength component and the long wavelength component that are emitted, the light transmitting means having width gradually decreasing from an entrance plane for the short wavelength component and the long wavelength component to an exit plane for the short wavelength component and the long wavelength component; a light guide plate which the short wavelength component and the long wavelength component that exit from the light transmitting means enter; and light scattering means scattering, towards the irradiation-target surface, the short wavelength component and the long wavelength component that have entered the light guide plate, the light scattering means being formed on the light guide plate.