| 摘要 |
<p>A Fresnel lens sheet capable of preventing troubles, e.g. a double image caused by a stray light, effectively. The Fresnel lens sheet (1) comprises a sheet-like base part (1a), and a plurality of prisms (2) formed on the incident side of the base part (1a). Each prism (2) has a face (3) for refracting a video light LS projected from a projector (5), and a face (4) for totally reflecting at least a part of the light refracted on the refracting face (3) toward the viewer side. At least some of the plurality of prisms (2) are arranged such that the video light L passed through each of such prisms (2) exits while being inclined by a specified angle (gammab, gammac) toward the side of the projector (5) projecting the video light LS when viewed from the direction normal to the sheet surface of the base part (1a).</p> |
