| 摘要 |
A light guide capable of reducing the degrading of the read image, even when the document face is raised, by expanding the distribution of light intensities in the longitudinal direction in the position of the irradiated item (document position), and a line illuminator into which the light guide is incorporated. The light guide emits lights incident on an end face from an emitting face extending longitudinally, while having the lights reflected by an internal face of the guide. The sectional shape of the internal face in a direction orthogonal to the longitudinal direction is provided with first and second oval arc curved faces, first and second emitting faces, and a light scattering part formed on the focal position (or a position near the focus) of the oval on the longer axis plane of each oval. The concentrating position of lights reflected by the first curved face and the concentrating position of lights reflected by the second curved face are different from each other.
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