Patent ID: 7433097

Claim:
An image scanner, comprising: a transparent platen; an optical head including; a light source; and a photosensor assembly; a calibration target positioned between the transparent platen and the optical head, where the calibration target can be moved to at least a first position and a second position, where, when the calibration target is in the first position, the photosensor assembly receives light, from the light source, scattered from a document, and when the calibration target is at the second position, the photosensor assembly receives light, from the light source, that is scattered from the calibration target; a slot formed in the calibration target, the slot having first and second ends; a pin connected to the optical head end extending into the slot in the calibration target; where motion of the optical head causes the pin move within the slot, and when movement of the pin applies force to either the first or second end of the slot, the calibration target is moved into either the first or second position.