| 摘要 |
An image scanning apparatus for scanning a plurality of mediums of different thicknesses with each medium scanned by pressing the medium to the scanning surface of an image scanning sensor with appropriate force using a first pressure mechanism comprising first rollers for pressing the medium to the scanning surface, a coil spring for urging the first rollers toward the scanning surface when the media thickness is less than a specified thickness, and a first tension spring for urging the first rollers to the scanning surface when the media thickness exceeds the specified thickness and a second pressure mechanism comprising second rollers for pressing the medium to the scanning surface, and a second tension spring for urging the second rollers to the scanning surface wherein the force imposed upon the scanning surface by the coil spring is substantially equal to the force imposed by the second tension spring.
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