| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a compact, high-illumination-efficiency illuminator in which the change in illuminance can be decreased even if the position of an original surface in a reading position varies in a direction perpendicular to an original plate; and to provide a spectral apparatus and an image reading apparatus which uses the illuminator. <P>SOLUTION: The illuminator includes a light source unit, and a light guiding member guiding a light beam emitted from the light source unit to an original disposed on the original plate. In the sub-scanning cross section, an intersection of a center axis of a light-emitting surface of the light source unit and the original plate is separated from the reading position of the original in a sub-scanning direction, the light guiding member includes an incident surface to which the light beam emitted from the light source unit is incident, a reflective surface that reflects the light beam incident from the incident surface, and an exiting surface exiting the light beam incident from the incident surface and the light beam reflected by the reflective surface, and in the sub-scanning cross section, the light beam having the highest intensity in the light beams from the light source unit is deflected at the incident surface toward the reading position of the original with respect to the center axis of the light-emitting surface. <P>COPYRIGHT: (C)2011,JPO&INPIT |
