Fluorescent radiation collector for image scanner
US5039854A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 7, 1990 |
| Grant date | Aug 13, 1991 |
| Priority date | — |
| Expiry date | May 7, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/00
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
For use in an image scanner, a highly efficient multistage fluorescent radiation collector collects radiation emitted, reflected, or transmitted from an image storage medium. A first elongated light pipe member has a first fluorescent dye which absorbs radiation from the storage medium and emits radiation of another wavelength. A second elongated light pipe member located adjacent to but optically isolated from the first member has a second fluorescent dye which absorbs emitted radiation escaping from the first member and which emits radiation of a third wavelength. Preferably, a third elongated light pipe member located adjacent to but optically isolated from the second member has a third fluorescent dye which absorbs emitted radiation escaping from the second member and which emits radiation of a fourth wavelength. Much of the radiation emitted by the first, second, and third dyes is channelled along the respective first, second, and third light pipe members to radiation sensors at the end(s) of the members.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.