Fresnel lens sheet and transmission-type projection screen
US6707605B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 15, 2002 |
| Grant date | Mar 16, 2004 |
| Priority date | — |
| Expiry date | May 15, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B21/625
- WIPO fieldOptics
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.