| 摘要 |
An image sensor unit for reading documents includes a casing elongated in the primary scanning direction, a light source, at least a pair of mirrors held in facing relation for alternately reflecting light, a lens unit for focusing light reflected on the document, and a sensor for receiving the light focused by the lens unit. For reducing the vertical dimension of the image sensor unit, the paired mirrors are spaced from each other in the secondary scanning direction within the casing.
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