| 摘要 |
An image reading device has a movable platen glass that is rotatably supported, that is substantially a prism having a plurality of read faces, and that is constructed so that rotation of the platen glass can switchably place one of the read faces in the read position. Therefore, even if the platen glass becomes stained, the image reading device makes it possible to start or continue reading document images without requiring labor and time for cleaning the platen glass.
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