Transparent-scattering type optical device including a prism with a triangular longitudinal cross section
US5206746A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 12, 1991 |
| Grant date | Apr 27, 1993 |
| Priority date | — |
| Expiry date | Jul 12, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/13756
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A transparent-scattering type optical device which includes a transparent-scattering type optical element having a layer of transparent-scattering mode optical material whose light scattering characteristics are changed in response to an external input; at least one prism having a bottom surface which is attached to an end portion of the transparent-scattering type optical element, and where the prism has a longitudinal cross section of a shape which is either triangular or triangular with a top portion cut away. A pair of angles formed by two opposite sides of the prism and the bottom surface are between 65.degree. and 90.degree. inclusive where one of the two angles is not equal to 90.degree.. A light absorbing face is formed from an area of the prism surface defined by portions of the two opposite sides of the prism nearest to the top.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.