Method of pulsing light emitting diodes for reading fluorescent indicia, data reader, and system
US6184534A · kind A · utility
75Cited by
36References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 4, 1998 |
| Grant date | Feb 6, 2001 |
| Priority date | — |
| Expiry date | Aug 4, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K7/12
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A system includes a data reader and media bearing fluorescent indicia. A method includes the steps of: pulsing a light emitting diode at a forward current level above continuous use operating limits to produce pulsed radiation within an absorption spectrum of the fluorescent material and at a flux density sufficient to induce a fluorescent emission from the indicia; illuminating the indicia with the pulsed radiation to produce the fluorescent emission; and imaging the indicia on a radiation image sensor sensitive to radiation within an emission spectrum of the fluorescence.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.