Patent ID: 8094348

Claim:
A duplex document scanning apparatus for scanning data on a front-side and a back-side of a document, the duplex document scanning apparatus comprising: a first image sensor, for sensing the data on the front-side of the document and outputting a first analog image signal corresponding to the data on the front-side; a second image sensor, for sensing the data on the back-side of the document and outputting a second analog image signal corresponding to the data on the back-side; a switch module, for switching the first image sensor and the second image sensor for selecting either the first analog image signal or the second analog image signal; a data conversion unit coupled to the switch module, for converting the first analog image signal and the second analog image signal to generate a first digital image signal and a second digital image signal correspondingly; and a scanning control device coupled to the first image sensor, the second image sensor, the switch module and the data conversion unit, respectively and having a switch control unit, for processing the first digital image signal and a second digital image signal, wherein the switch control unit generates a switch signal for controlling the switch module and the switch module simultaneously outputs the first analog image signal and the second analog image signal during a signal period of the switch signal.