| 摘要 |
An image reading apparatus (X) includes a light source, a case ( 2 ) for accommodating the light source, and a substrate ( 8 ) mounted to the case ( 8 ). A plurality of sensor IC chips ( 7 ) for detecting the light traveling from an image reading region are mounted on the substrate ( 8 ). The sensor IC chips ( 7 ) are arranged at positions closer to a second side edge ( 8 b) than to a first side edge ( 8 a) of the substrate. A predetermined wiring pattern is formed on the substrate ( 8 ). The sensor IC chips ( 7 ) are electrically connected to the wiring pattern via wires (W). The wires (W) are connected to the wiring pattern by extending from the upper surface of the sensor IC chips ( 7 ) toward the first side edge ( 8 a) of the substrate.
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