Patent ID: 7887203

Claim:
A multiple reflection optical system comprising a light beam input means (E) and an output means (S); and a first mirror (M 1 ) having a radius of curvature R 1 , said first mirror being arranged opposite and at a distance d 2 from a second mirror (M 2 ) having a second radius of curvature R 2 and opposite and at a distance d 3 from a third mirror (M 3 ) having a third radius of curvature R 3 , the first mirror (M 1 ) and the second mirror (M 2 ) being arranged in such a way that 0 < ( 1 - d 2 R 1 ) ⁢ ( 1 - d 2 R 2 ) < 1 , and the first mirror (M 1 ) and the third mirror (M 3 ) being arranged in such a way that 0 < ( 1 - d 3 R 1 ) ⁢ ( 1 - d 3 R 3 ) < 1 , the first mirror (M 1 ) and the second mirror (M 2 ) forming a first optical cell having a first optical axis, the first mirror (M 1 ) and the third mirror (M 3 ) forming a second optical cell having a second optical axis, said first and second optical axes being separate, the radii of curvature R 1 , R 2 , R 3 and the distances d 2 and d 3 not being simultaneously equal, said first and second optical cells being arranged in such a way that the light beam is contained in the optical system between the input means and the output means.