Scanner for reading color image
US4930008A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 12, 1989 |
| Grant date | May 29, 1990 |
| Priority date | — |
| Expiry date | Apr 12, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/484
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A color image scanner which includes a plurality of light sources composed of a first light emitting diode for emitting a red light, a second light emitting diode for emitting a yellow light and a fluorescent light source for emitting a blue light, a control circuit for switching the plurality of light sources, sequentially and an image sensor for receiving light reflected from the original, scanned image, wherein a characteristic value of the light emitted from the first light emitting diode is selected so as to have an overlap in wavelength with that of the light emitted from the second light emitting diode, and a characteristic value of the light emitted from the fluorescent light source is selected so as to have an overlap in wavelength with that of the light emitted from the second light emitting diode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.