Illuminating device, image reading apparatus and image forming apparatus

Abstract

An illuminating device according to an embodiment included in an image reading apparatus and an image forming apparatus includes light source portions, light-guiding members for illuminating an illumination target from an elongated light emitting face that extends in a longitudinal direction, by guiding light from the light source portions, and holding members for holding the light-guiding members. The holding members include holding portions for removably holding the light-guiding members, and tilted portions that reflect light emitted from the light emitting face, the tilted portions extending from a front end on the light emitting face side of the holding portions, obliquely widening with increasing distance from the light-guiding members.

1 . An illuminating device comprising:
 a light-emitting element;   a substrate on which the light-emitting element is mounted; and   
       a light-guiding member,
 wherein the light-emitting element is disposed so as to face an end portion of the light-guiding member in a longitudinal direction, and light from the light-emitting element is made incident upon the end portion in the longitudinal direction, 
 wherein the light-guiding member guides the light inside so as to illuminate an illumination target from a light emitting face along the longitudinal direction of the light-guiding member, and 
 wherein the illuminating device includes 
 a facing member that is arranged so as to face a light-emitting element-mounted surface of the substrate and that is provided with a through hole for passing the light from the light-emitting element to the end portion of the light-guiding member, and 
 a radiator member that is arranged so as to face a surface of the substrate, the surface being opposite to the light-emitting element-mounted surface.