US 2004/0165233 A1Published application

Method of operating a double-sided scanner

AssigneeTranspecific IP Ltd.

InventorKuo-Jeng Wang

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Abstract

An operating method for a double-sided scanner is provided. A light source of one particular color inside a first group of light sources and a light source of a different color (or the same color) inside a second group of light source are lit to scan the front and back surface of a scan document. Optical signals from the front and back surface of the scan document are received and converted into analogue electrical signals. Thereafter, the analogue electrical signals are converted into digital electrical signal. Finally, the digital electrical signals are output to a host computer. This invention utilizes two groups of light sources (for example, light-emitting diodes) to serve as light sources for the double-sided scanner. Because light-emitting diodes require no warm-up period and is quick to switch, double-sided scanning is simplified.

Claims18

Dependent claims

A method of operating a double-sided scanner for scanning a document, wherein the double-sided scanner includes a light-emitting module, a first group of sensors and a second group of sensors, and the light-emitting module includes a first group of light sources and a second group of light sources for scanning the front surface and the back surface of the document respectively, the operating method comprising the steps of:

controlling of the first group of light sources such that its illuminating range does not overlap with the scanning range of the second group of sensors and controlling the second group of light sources such that its illuminating range does not overlap with the scanning range of the first group of sensors;
triggering light sources within the first group of light sources and the second group of light sources having the same color to emit light so that the front and back surface of the document can be scanned;
receiving optical signals reflected from the front and back surface of the document and converting the optical signals into analogue electrical signals;
converting the analogue electrical signal into digital electrical signals;
and
outputting the digital electrical signals.

3 more elements

Dependencies are inferred from the claim text.