Hybrid illumination system for accelerating light integration in image sensing systems
US6104510A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 19, 1998 |
| Grant date | Aug 15, 2000 |
| Priority date | — |
| Expiry date | Jun 19, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/484
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The present invention has particular applications to scanners such as desktop and sheet-fed scanners. To keep the scanner cost down while increasing the overall system performance, the present invention discloses an improved scanning mechanism that uses a single image sensor and a hybrid light source comprising at least one colored LED and at least one colored cold cathode fluorescent lamp. According to one embodiment, the hybrid light source uses a blue cold cathode fluorescent lamp and a red LED and a green LED. Three color signals are respectively generated under three different illuminations, namely the blue cold cathode fluorescent lamp alone, the red LED together with the blue cold cathode fluorescent lamp and the green LED together with the blue cold cathode fluorescent lamp. With the strong intensity provided by the blue cold cathode fluorescent lamp, the light integration process intervals are significantly reduced as such the overall system performance of scanning systems is greatly improved.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.