Document read apparatus and image forming apparatus
US8228568B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 20, 2009 |
| Grant date | Jul 24, 2012 |
| Priority date | — |
| Expiry date | Dec 18, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/0434
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The document read apparatus according to the present invention has a light source unit that includes a linear first light and second light sources, both light sources aligned parallel to the sub scanning direction (moving direction). When the light source unit is scanning a book document in a second region shifted toward a side of the first light source from a center position for emitting light to the center of the document, a light quantity of the second light source becomes larger than a light quantity of the first light source. When the light source unit is scanning the book document in a third region shifted toward a side of the second light source from the center position, the light quantity of the first light source becomes larger than the light quantity of the second light source. A sum of both light quantities is controlled to be constant.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.