Sheet-fed scanning device capable of detecting a document edge
US7327502B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 17, 2004 |
| Grant date | Feb 5, 2008 |
| Priority date | — |
| Expiry date | Aug 12, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/0081
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A sheet-fed scanning device capable of detecting a document edge includes a scanning module and an automatic document feeder. The scanning module scans a document with a light ray. The automatic document feeder feeds the document across a scanning region on a sheet passageway for the scanning module to scan. In this invention, a section of a guide plate of the sheet passageway located within the scanning region is formed with a concave portion, wherein the document moving across the scanning region is located between the concave portion and the scanning module, such that the intensity of a first brightness of the concave portion sensed by the scanning module is far smaller than the intensity of a second brightness of the document sensed by the scanning module. Thus, it is possible to facilitate the document edge detection and the document skew correction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.