| 摘要 |
<p>An image sensor unit includes: sensor substrates on which a plurality of sensor chips are mounted; rod-lens arrays that focus light from an original on the sensor substrates; and a frame body that houses the plurality of sensor substrates and the plurality of rod-lens arrays. The frame body is divided into a first frame and a second frame. A side surface of the rod-lens array in a sub-scan direction is fixed only by the first frame, and the plurality of rod-lens arrays are arranged in the main-scan direction.
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