Transflective colour filter, and a method of manufacturing such a filter
US5570240A · kind A · utility
0Cited by
8References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 12, 1993 |
| Grant date | Oct 29, 1996 |
| Priority date | — |
| Expiry date | Nov 12, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C7/12
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A transflective optical filter comprises a single transparent or transluscent substrate; a colored slice made up of a plurality of layers, each corresponding to one color out of at least two colors; a light diffusing layer; and an opaque mask on which the marks to be displayed in color are represented by transparent zones, the colored slice and the mask consisting of photographic emulsions. A method for making that filter involves multiple exposures of a same film having a multi-colored "slice" and a monochrome photosensitive layer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.