Duplex scanner capable of calibrating two-sided documents
US6967749B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 17, 2001 |
| Grant date | Nov 22, 2005 |
| Priority date | — |
| Expiry date | Oct 30, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/4076
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A duplex scanner capable of calibrating the two-sided documents comprises an automatic document feeder (ADF), an upper carriage and an upper calibration paper. The upper carriage is installed in the ADF and the upper calibration paper is installed under the upper carriage. Alternatively, the upper carriage is movable installed in the ADF while the upper calibration paper is fixed in the duplex scanner and corresponding to the upper carriage. Before image scanning, the relative motion between the upper carriage and the first calibration paper is generated for calibrating the light beam information. According to the invention, the effects of the contaminated upper calibration paper for the calibration of the light beam information can be reduced, and the quality of the scanning image is greatly enhanced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.