Holographic diffusers
US6509982B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 8, 2002 |
| Grant date | Jan 21, 2003 |
| Priority date | — |
| Expiry date | Jan 8, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B5/32
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A collimated or partially collimated light beam is sent through a substrate matrix of a plurality of nested individual joined geometrically shaped cells wherein each of the cells contains a patterned holographic diffuser or binary optic sheet which produces a transmitted diffused light beam from each of the cells and then superimposes each transmitted diffused light beams from each of the cells to produce a combined resultant diffused light beam. The geometrically shaped cells are clustered in a contiguous arrangement of nested cell subgroups, which are themselves geometrically shaped. When graphed, an angular luminance distribution profile curve with sharply vertical profile slopes at halfpeak points and with a substantially flat and wide peak is resultant which produces a uniform resultant luminance over a wide range of view with a predetermined beam spread and beam deflection angle in relation to a predetermined location of view of the combined resultant diffused light beam.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.