Patent ID: 7110149

Claim:
A carriage module for a scanner, comprising a case moving horizontally in an outer casing between a first and a second scanning positions, said case including a first shell and a second shell telescopically coupled each to the other, said first shell having first walls extending between first and second edges of said first shell, and said second shell having second walls extending between a front and a rear portions of said second shell, said first walls of said first shell enveloping said second walls of said second shell and defining a channel within said first shell, wherein said second shell reciprocates within said channel defined by said first walls of said first shell; an image sensor arranged in said first shell; a mirror set arranged in said second shell and guiding a reflected light from a document to be scanned to the image sensor in said first shell; a lens set placed between the image sensor and the mirror set and focusing the reflected light to the image sensor; wherein the second shell has a length larger than that of the first shell, and wherein said first shell telescopically moves outside and along said second walls of said second shell in said first and second scanning positions towards a respective inner wall of said outer casing a predetermined distance beyond a respective one of said front and rear portions of said second shell.