Patent ID: 7298530

Claim:
An optical module with movable reflective mirrors used in a scanner for a scanning of a document to be scanned, wherein the optical module comprises: a first carriage comprising a first reflective mirror, a lens and a photoelectric sensing device, wherein the first carriage moves along a scanning direction to scan the document to be scanned; a second carriage comprising a second reflective mirror, wherein the second carriage can make relative movement corresponding to the first carriage along the scanning direction; and a third carriage comprising a third reflective mirror, wherein the third carriage can make relative movement corresponding to the first carriage along the scanning direction; of which, the first carriage is situated between the second carriage and the third carriage with a distance between the second carriage and the third carriage being fixed at a constant value during the course of scanning, while image light of the document to be scanned forms an image on the photoelectric sensing device via focusing of the lens after having been reflected via the first reflective mirror, the second reflective mirror, and the third reflective mirror sequentially.