Patent ID: 6381347
Filing Date: 2002-04-30
Classification: G06K

Abstract:
A compact apparatus for forming a high contrast, low distortion image of a patterned object including:a light refractor for reflecting and refracting light, the light refractor including: an imaging surface against which a patterned object to be imaged is to be placed; at least one light entrance surface adjacent to the imaging surface and through which light enters the refractor; and a viewing surface adjacent to the imaging surface and through which an image of the object to be imaged is projected and which is the same surface as the light entrance surface; a further surface positioned between and different from the imaging surface and the light entrance surface; at least one focusing lens adjacent to the viewing surface and for receiving and focusing an image of a patterned object projected through the viewing surface; and at least one light source located adjacent to the light receiving surface and for emitting incident light which enters the light refractor to create an image of the patterned object at the viewing surface, the image focused by the at least one focusing lens, the light source positioned such that light emitted therefrom and entering the light refractor strikes at least the further surface at an angle greater than the critical angle of the further surface before striking the imaging surface at an angle less than the critical angle of the imaging surface such that the image of the patterned object from the imaging surface and projected through the viewing surface is generated by substantially all scattered light from the imaging surface.