Image reading apparatus
US6545777B1 · kind B1 · utility
10Cited by
2References
21Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 17, 1999 |
| Grant date | Apr 8, 2003 |
| Priority date | — |
| Expiry date | Jun 17, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/484
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a color scanner, three LEDs for irradiating an original with colors R, G, and B are so switched as to sequentially emit light for respective predetermined emission times, and a reading unit is moved to read the original. This invention reduces color misregistration occurring due to the differences between irradiation positions resulting from the switching. Of the RGB LEDs, the start point of the emission time of the G LED having the longest emission time is matched with the end point of the emission time of the R LED before this G LED. The B LED emits light after the end point of the emission time of the G LED.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.