Image scanning device
US8467108B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 5, 2009 |
| Grant date | Jun 18, 2013 |
| Priority date | — |
| Expiry date | Jan 13, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/0081
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An image scanning device comprises a white reference board having a uniform white color; an irradiation device including a light source unit having a light source, the light source unit configured to irradiate a reflection side of the white reference board from only one oblique direction; an image sensor configured to detect reflected light from the white reference board; and a determination device configured to determine if an attached substance exists on the white reference board based on the reflected light detected by the image sensor. The irradiation device includes a reflection board configured to rotate and to focus the light from the light source by its rotation and reflect the focused light onto a manuscript. The irradiation device is configured to irradiate uniformly the manuscript with both the light source and the reflection board when the manuscript is scanned, and to irradiate the white reference board from only one oblique direction with the light source before white reference data are generated from the white reference board.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.