Patent ID: 8646925

Claim:
A solar simulator comprising: a light source; an optical reflection element positioned behind said light source to reflect light emitted from said light source in a form of pseudo parallel light; a low-angle light-diffusion optical element for diffusing the reflected light from said optical reflection element at a low diffusion angle; and a parallel light conversion optical element including a number of air holes arranged in parallel rows and provided with faculties for transmitting incident light parallel to the axis of said air holes to absorb or attenuate nonparallel incident light, said parallel light conversion optical element converting the incident light from said low-angle light-diffusion optical element to parallel light and emitting the converted parallel light, said parallel light conversion optical element comprising an air-pipe optical element including a number of air pipes arranged in parallel rows and provided with faculties for allowing incident light parallel to the axis of the air holes to be transmitted there through and nonparallel incident light to be absorbed, an incident light from said low-angle light-diffusion optical element being converted to parallel light and the converted parallel light is emitted, a surface on a light exit side of said air-pipe element being configured by a light-absorbing rough surface.