Patent ID: 7561330

Claim:
A reflection type projecting screen, for reflecting projection light from a light source, comprising: a diffuse transmission surface for converting at least transmission light into diffused light; and a corner cube group positioned at a back surface side of said diffuse transmission surface when looking from said light source, said corner cube group reflecting said projection light passing through said diffused transmission light towards said diffuse transmission surface; wherein the following Formulas are satisfied when inputting light of wavelengths λ B =485 nm, λ G =550 nm, and λ R =650 nm 0.8≦( R B /I B )/( R G /I G )≦1.25 (1) 0.8≦( R R /I R )/( R G /I G )≦1.25 (2) where I B , I G , and I R represent the incident light intensities of wavelengths of λ B , λ G , and λ R , respectively, and R B , R G , and R R represent the output light intensities of wavelengths of λ B , λ G , and λ R , respectively.