Fresnel lens sheet and transmission-type projection screen
AssigneeDai Nippon Printing Co., Ltd.
InventorHiroshi Sekiguchi
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Abstract
A Fresnel lens sheet of the present invention is applicable to a transmission-type projection screen, which comprises 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, 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 layer side toward the base material layer side.
Claims15
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 layer side toward the base material layer side.
A transmission-type projection screen provided with a Fresnel lens sheet, wherein the Fresnel lens sheet comprises a base material layer, a lens layer formed into a Fresnel lens configuration, a total reflection surface which is disposed at a position between an incident surface and an light-emission surface and totally reflects a portion of projection light proceeding on an optical path in a direction from the lens layer side toward the base material layer side, and wherein the Fresnel lens sheet is further comprises one diffusion means selected from the group consisting of a diffusion material added inside the Fresnel lens sheet, an interface between layers which constitute the Fresnel lens sheet formed into a projection-dent configuration, a light-emission surface formed into a rough face, and a light-emission surface formed into a lenticular configuration.
Dependencies are inferred from the claim text.