Patent ID: 7677738

Claim:
An image projector comprising: a reflecting light valve that displays an optical image; a projecting optical system that enlarges and projects said optical image given from said light valve; and a screen onto which said optical image enlarged by said projecting optical system is projected, said projecting optical system comprising: a group of refracting lenses that receives and enlarges light from said light valve; and a power mirror that has a power and that receives, and enlarges and reflects light from said group of refracting lenses, wherein a display surface of said light valve and a screen surface of said screen are disposed perpendicular to an optical axis, and wherein, when a minimum value of an angle formed between a normal to said screen surface and principal rays incident upon said screen is a minimum angle of view θmin, and, about said group of refracting lenses, a radius of curvature of an ith surface is r i , a refractive index of said ith surface is n i , a refractive index of an (i+1)th surface is n i+1 , and a total number of lens surfaces is N, and a sum of Petzval components of the surfaces of the plurality of lenses of said group of refracting lenses is a Petzval partial sum of the lenses, PL, and PL=Σ{− 1/ r i ×(1/ n i+1 −1/ n i )} [i=1, . . . , N], then, in said projecting optical system, an exit pupil position is set such that said minimum angle of view θmin exceeds 40°, and a relation of PL>0.0007×θmin−0.026 is satisfied.