Focussing in a scanner by changing the position of a sensor in relation to a lens

摘要

Systems and methods for providing multiple object planes in an optical image scanner (100) are provided. One embodiment is an optical head (104) configured to scan an object (106), comprising a rod-lens array (110) positioned to focus light reflected off the object (106), an optical sensor array (112) for receiving light focused through the rod-lens array (110), and a reflective surface (108) variably positioned relative to the rod-lens array (110) for reflecting light from the object (106) to the rod-lens array (110). Another embodiment comprises a method for providing multiple object planes in an optical image scanner (100) comprising positioning an optical head (104) relative to a platen (102) to locate a primary focal point of a rod-lens array (110) at a first object plane and adjusting the position of an optical sensor array (112) relative to the rod-lens array (110) to relocate the primary focal point of the rod-lens array (110) at a second object plane. The sensor may be moved by a linear actuator or be mounted on a hinged surface.