Light guide plate with convex portions having low radius of curvature tips, or low surface roughness
US7048428B2 · kind B2 · utility
12Cited by
7References
34Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 11, 2002 |
| Grant date | May 23, 2006 |
| Priority date | — |
| Expiry date | Apr 25, 2023 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S425/81
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A light guide plate made of a transparent resin includes a first main surface and a second main surface opposite to the first main surface. The first main surface has a surface portion provided with convex portions having a height in the range of 5×10−7 m to 6×10−5 m each and a pitch in the range of 5×10−7 m to 4×10−4 m. The light guide plate having tip portions of at least 80% of the total convex portions with a radius of curvature of 2×10−6 m or less, or the surface of the convex portions having a surface roughness of 3×10−7 m or less.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.