| 摘要 |
The present invention provides a Fresnel lens sheet that can, in production using a mold, be easily released from the mold and that scarcely produces stray light upon use, and others. Each prism 2 on the incident side of a Fresnel lens sheet 1 is formed to have a nearly triangular cross section and has a plane of refraction 3 that refracts projected light S incident on this plane and a plane of total reflection 4 that totally reflects, toward the viewer's side, at least part of the light refracted at the plane of refraction 3 . Each prism 2 is made so that a root 5 between a prism 2 and a prism 3 situated next to the prism 2 , on the plane of total reflection side of the prism 2 (a root 5 defined by the plane of refraction 3 of one prism 2 B and the plane of total reflection 4 of another prism 2 A situated next to the prism 2 B, on the side of the plane of refraction 3 of the prism 2 B) is curved toward the prism 2 A side from the prism 2 B side. |
