| 摘要 |
Optical elements (32) arranged in a latticed pattern in a screen member (30) for diffusing laser light incident from a projector (10) and guiding the laser light toward a projection plane (91) have curved faces (33) exhibiting the same convex curved form formed on surfaces thereof, and diffuse the laser light emitted from the curved faces (33) toward the projection plane (91). The optical elements (32) are provided with a plurality of reference elements (32A) serving as a reference, and a plurality of adjacent peripheral elements (32B, 32C, 32D, 32E, 32F) on the periphery of each reference element. Face apexes (34) of the curved faces are formed so that there is a level difference between the face apexes (34) of the reference elements (32A) and the face apexes (34) of the adjacent peripheral elements (32B, 32C, 32D, 32E, 32F). The level difference amounts (δ1, δ2, δ3, δ4, δ5) between the reference elements (32A) and the adjacent peripheral elements (32B, 32C, 32D, 32E, 32F) are each different. |
