Patent ID: 6707605
Filing Date: 2004-03-16
Classification: G03B

Abstract:
A Fresnel lens sheet comprising a layered structure provided with at least a base material layer, a lens layer formed into a Fresnel lens configuration, an incident surface on which projection light is incident and an light-emission surface from which the projection light is emitted, the incident surface being disposed on either the lens layer side or the base material layer side and the light-emission surface being disposed on a side opposite to the incident surface,wherein a total reflection surface is disposed in the layered structure at a position between the incident surface and the light-emission surface, the total reflection surface totally reflecting a portion of projection light proceeding on an optical path in a direction from the lens layers side toward the base material layer side, wherein a distance between the total reflection surface and a surface of the base material layer side is larger than a distance between the total reflection surface and a bottom line of the notches of the lens layer.