| 摘要 |
An image scanner is provided to obtain a high quality image by removing an optical interference pattern from a forgery/alteration preventing element recorded on a medium, and keep high preciseness and reliability while obtaining the high quality image by scanning both sides of the medium at the same time. A loading track guides loading of the medium(2) having the forgery/alteration preventing element generating the optical interference pattern. A loader loads the medium by being mounted along the loading track. An image sensor is mounted to obtain image data from the medium loaded along the loading track. The image sensor includes a light source(132), a light receiver(134), the first polarizer(136a) polarizing light output from the light source at a front side of the light source, the second polarizer(136b) polarizing the light reflected from the medium at the front side of the light receiver and having a phase difference of 90‹ to the first polarizer, and a lens(138) guiding the light passing the second polarizer to the light receiver.
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