Patent ID: 7817310
Filing Date: 2010-10-19
Classification: G03G

Abstract:
1. A sheet-size detecting mechanism disposed in an image scanning apparatus, wherein a sheet is scanned at a scanning position located on a sheet transporting path of the image scanning apparatus, the mechanism comprising: a detecting position located on the sheet transporting path, wherein the sheet is transported along the sheet transporting path first past the detecting position and then the scanning position; a light source for providing light rays to illuminate the sheet at the detecting position and the scanning position; a photosensor for receiving reflected light rays reflected by the sheet at the detecting position and the scanning position; a path-routing device for directing the reflected light rays to the photosensor, wherein the reflected light ray reflected by the sheet at the detecting position travels a first path different from a second path which the reflected light ray reflected by the sheet at the scanning position travels; and a processing unit for processing a first image signal generated according to the reflected light ray traveling the first path and using the first image signal as a reference for calculating size of the sheet, and for processing a second image signal generated according to the reflected light ray traveling the second path and obtaining a scanned image of the sheet.