| 摘要 |
In an image reading apparatus such as copying apparatus, image scanner, or the like using a contact type image sensor, a frame of the contact type image sensor is made of a resin material and a cross sectional shape of an original plate glass in the sensor longitudinal direction of the contact type sensor is formed in almost the same curve shape as a warp shape in the vertical direction of an original of the contact type image sensor, thereby constructing such that the distance is substantially equal at all positions and solving a problem that an out-of-focus partially occurs.
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