Abstract:
An apparatus having an image behind a document to be scanned on an optical image scanner, copier, facsimile machine or similar device. The image behind the document would partially bleed-through into the reproduced image, leaving a faint replica of the auxiliary “bleed-through” image in the reproduced image.

Description:
FIELD OF THE INVENTION 
     This invention relates generally to scanners, copiers, facsimile machines and other devices used for transforming an optical image of a document into a electronic signal and more specifically to holding an auxiliary image in place such that the auxiliary image intentionally is included in and added to the electronic signal. 
     BACKGROUND OF THE INVENTION 
     Electronic document scanners, copiers, and facsimile machines transform an optical image of a document into an electric signal suitable for storing, displaying, printing or electronic transmission. There is a need to mark certain documents with an “electronic watermark.” An electronic watermark is any auxiliary image that will he added to die electronic copy of the original document. The electronic watermark could be a company name or symbol, or it could be information used to track which scanner, copier, or facsimile machine was used to create the reproduction or it could be the name of the person creating the reproduction. 
     SUMMARY OF THE INVENTION 
     An auxiliary image or symbol is positioned on a scanner, copier, or facsimile machine such that the auxiliary image or symbol intentionally is included in and added to the electronic version of the document being reproduced. In an example embodiment, an apparatus has a holder to position the auxiliary image or symbol onto the document that will be converted into electronic form. The holder allows the auxiliary image or symbol to be easily changed or removed. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a cross section of an imaging device including an auxiliary image and a secondary reflective surface. 
     FIG. 2 is a perspective view of a secondary reflective surface with a transparent material forming a pocket. 
     FIG. 3 is a perspective view of a copy of the auxiliary image partially inserted into the pocket formed by the transparent material and the secondary reflective surface. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     An auxiliary image or symbol is positioned on a scanner, copier, or facsimile machine such that the auxiliary image or symbol is added to the electronic version of the document being reproduced. The auxiliary image could be any information that the user wants to include in the reproduced images. For example, the company trademark could be inserted such that each reproduced image would include the company trademark for advertisement or for tracking purposes. 
     Documents to be scanned may generally be classified as either transparent or opaque. For opaque documents, light is reflected off an image on the surface of the document onto a photosensitive transducer, typically a photoconductive drum or an array of photosensitive sensor elements. However, documents are rarely completely opaque. In a typical device, some light passes through the document to a secondary reflective surface, for example a lid or automatic document feeder. Some light then reflects off the secondary reflective surface and passes back through the document a second time. The light that passes through the document twice may also be detected by the photosensitive transducer. When there is a second image placed above or behind the first document the second image may be partially imaged onto the photosensitive transducer. 
     FIG. 1 illustrates a document  106 , laying face down on a transparent platen  108 , with a lid or automatic document feeder  100 . The document  106  has an image on a front face  120 . The lid or automatic document feeder  100  provides a secondary reflective surface  126 . A lamp  110  provides light rays  112 . Most of the light rays  112  reflect off the front face  120  of the document  106 , generating front reflected light rays  116 . Some of the light rays  112  pass through the document  106 , and reflect off of the auxiliary image surface  124 , passing back through the document  106 , generating secondary reflected light rays  118 . Both light rays  116  and  118  are received and transformed by a photosensitive transducer  114 . Transducer  114  may be a photosensitive drum or an array of photosensitive elements or a single light beam may be scanned and reflected onto a single sensor. The figure is simplified in that scanning devices typically include lenses, mirrors and other optical components not relevant to the invention. 
     Reflected light  118  will have a faint image of what was on the surface  124  of the auxiliary image. The intensity of the image will be dependent on the intensity or contrast of the image on surface  124 , and the thickness or opaqueness of the document  106 . The larger the differences between the dark areas and light area on the auxiliary image  102 , and the thinner or more transparent document  106 , then the more apparent the auxiliary image will be in the reproduced image. 
     FIG. 2 shows a secondary reflective surface  200 , covered by a transparent material  204 , that forms a pocket or slot  202 , in which an auxiliary image can be placed. The auxiliary image will be placed such that it will intentionally add to and be included into the final electronic image formed by the device. FIG. 3 shows the secondary reflective surface  200 , and the transparent material  204 , with the auxiliary image  302 , shown partially inserted into the pocket or slot  202 . In actual operation the auxiliary image  302 , would be fully inserted into the pocket or slot  202 . 
     The foregoing description of the present invention has been presented for purposes of illustration and description. It is not intended to be exhaustive or to limit the invention to the precise form disclosed, and other modifications and variations may be possible in light of the above teachings. The embodiment was chosen and described in order to best explain the principles of the invention and its practical application to thereby enable others skilled in the art to best utilize the invention in various embodiments and various modifications as are suited to the particular use contemplated. It is intended that the appended claims be construed to include other alternative embodiments of the invention except insofar as limited by the prior art.