Triangular pyramidal cube corner retroreflection element
US6817724B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 31, 2002 |
| Grant date | Nov 16, 2004 |
| Priority date | — |
| Expiry date | Jul 31, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/24479
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
To provide a triangular-pyramidal cube-corner retroreflective elements extremely superior in reflectivity at an entrance angle of 30° or more, preferably 40° or more. Triangular-pyramidal cube-corner retroreflective elements characterized in that when assuming the height from a bottom plane (Sx-Sx′) including base edges (x,x, . . . ) shared by two triangular-pyramidal reflective elements faced each other up to apexes (H1 and H2) of the triangular-pyramidal reflective elements as hx, the height from a bottom plane (Sy-Sy′) including other base edges (y,y, . . . ) of the triangular-pyramidal reflective elements as hy, and the height from a bottom plane (Sz—Sz) including still other base edges (z,z . . . ) of the triangular-pyramidal reflective elements as hz, any two of hx, hy, and hz are substantially different from each other and a mirror reflective layer is formed on surfaces of the triangular-pyramidal reflective elements.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.