Patent ID: 8067081

Claim:
A screen comprising: a reflection surface which reflects projection light, the reflection surface including a plurality of convexes disposed thereon that each include a spherical surface having a ¼ spherical shape, a curved surface having curvature larger than curvature of the spherical surface and disposed along an end of the spherical surface, and a cover surface having a flat surface shape and disposed at an end of the curved surface, wherein the convexes project from a flat surface extending along the reflection surface; and when a point A as a cross point of the spherical surface and the flat surface, a point B as a cross point of the spherical surface and the curved surface, a point C as a cross point of the curved surface and the cover surface, a point D as a cross point of the cover surface and the flat surface, and a point O as the center point of the spherical surface are provided in a cross-sectional shape extending in a first direction where the spherical surface, the curved surface, and the cover surface of each of the convexes are disposed, crossing the flat surface at a right angle, and passing the center of the convex in a second direction perpendicular to the first direction, a circular arc having a radius R between the points A and B, a circular arc having a radius R 1 shorter than the radius R between the points B and C, a straight line between the points C and D, and a straight line passing the point O between the points D and A are formed.