Reflexive optical screen, and viewing system incorporating the same

A reflexive optical screen comprising a plurality of zonal V-grooved reflecting surfaces substantially concentrically located within a given surface and having a retrorelection action, wherein:

• each of said zonal V-grooved reflecting surfaces comprises mutually orthogonal two conical facets in a section orthogonal to a ridgeline of a V groove, and the conical facets of each of said zonal V-grooved reflecting surfaces are located such that an angle of entrance on a screen surface of a bisector for an angle that said two conical facets make in said section becomes a/2 where (x is an angle of incidence of a light ray on each of said zonal V-grooved reflecting surfaces relative to the screen surface.

A reflexive optical screen comprising a plurality of zonal V-grooved reflecting surfaces substantially concentrically located within a given surface and having a retrorelection action, wherein:

• each of said zonal V-grooved reflecting surfaces comprises mutually orthogonal conical facets in a section orthogonal to a ridgeline of a V groove, and said reflexive optical screen satisfies condition (1-1)
• 0.1<β/α<O0.9 (1-1)
• where (x is an angle of incidence of a light ray radiated from a finite distance point and incident on a screen surface portion of each of said zonal V-grooved reflecting surfaces, and 0 is an angle of a bisector for an angle that said two conical facets make in said section with respect to a screen surface.