Patent ID: 7538912
Filing Date: 2009-05-26
Classification: H04N

Abstract:
1. An image reading apparatus comprising: a light source for illuminating an image reading region extending in a primary scanning direction; a case for accommodating the light source; a substrate including a first side edge and a second side edge spaced from each other in a secondary scanning direction which is perpendicular to the primary scanning direction, the substrate being elongated in the primary scanning direction and mounted to the case; a plurality of sensor IC chips for detecting light traveling from the image reading region, the sensor IC chips being mounted on a principal surface of the substrate at positions closer to the second side edge than to the first side edge; a wiring pattern formed on the substrate; a plurality of wires electrically connecting the sensor IC chips and the wiring pattern to each other; a light guide for guiding light emitted from the light source to the image reading region; and a reflector held in contact with the light guide to prevent light from leaking from the light guide; wherein each of the wires is connected to the wiring pattern by extending from a corresponding one of the sensor IC chips toward the first side edge of the substrate, the light source is mounted on an end of the principal surface of the substrate in the primary scanning direction, the case is provided with a first partition wall for separating the light source and the sensor IC chips and with a second partition wall for separating the light guide and the sensor IC chips, the first partition wall is held in contact with the principal surface of the substrate, and the second partition wall is spaced from the substrate, and the reflector is provided on the second partition wall.