Image reading device
US6580528B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 30, 1999 |
| Grant date | Jun 17, 2003 |
| Priority date | — |
| Expiry date | Nov 30, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/04791
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A reading scan controlling unit drives a scanning motor in accordance with a signal from a reading instructing unit and a line synchronous generating unit for scanning a document plural times in a slow-scanning direction, as well as controls a sensor driver to read a document image. At this time, an optical flat plate driving unit is controlled in the second and following scans to incline an optical flat plate provided in an imaging optical path at a predetermined angle in a fast-scanning direction, so that the imaging position on a CCD sensor in a fast-scanning direction is slightly changed. Further, the scanning speed is determined in accordance with the scanning times. An image reading device having such a construction can perform high-speed reading with high precision by using an image shift method.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.