IMAGE READING DEVICE

To obtain an image reading device with stable optical characteristics at the end of a light guide without complicating a manufacturing process.SOLUTION: An image reading device includes a light guide that guides light incident from the end face of a rod-shaped transparent body that extends along a main scanning direction of a sensor unit, a scattering unit formed on the surface of the light guide on the opposite side of the irradiation position along the main scanning direction to scatter light, an exit unit formed on the surface of the light guide between the scattering unit and the irradiation position along the main scanning direction, and in which a scattering unit emits the scattered light to the irradiation position, and a stepped unit formed on the light guide on the side opposite to the irradiation position along the main scanning direction from the end face, and a light-shielding unit that extends beyond the stepped unit in the main scanning direction and whose end is outside a reading range in the main scanning direction of the sensor unit, which is a member that covers a part of the exit unit of the light guide including the end face.SELECTED DRAWING: Figure 9 【課題】製造工程を複雑化することなく、導光体の端部の光学特性が安定した画像読取装置を得ること。【解決手段】センサ部の主走査方向に沿って延在した棒状の透明体で、透明体の端面から入射された光を主走査方向に導光する導光体と、照射位置と反対側の導光体の表面に主走査方向に沿って形成され、光を散乱させる散乱部と、散乱部と照射位置との間の導光体の表面に主走査方向に沿って形成され、散乱部が散乱した光を照射位置へ出射する出射部と、端面から主走査方向に沿って、照射位置と反対側の導光体に形成された段差部と、端面を含む導光体の出射部の一部を覆う部材であって、主走査方向において段差部を超えて延伸し、端部がセンサ部における主走査方向における読取範囲の外にある遮光部とを有することを特徴とする。【選択図】 図９