Light irradiation system, image scanning apparatus, and image forming apparatus

摘要

A light irradiation system for irradiating light to an irradiation area extending in a main scanning direction of a document face when placed on an image scanning apparatus includes a light source; a light guiding member to guide light emitted from the light source; and a reflector to reflect a part of light exiting from the light guiding member to the document face. The irradiation area is irradiated by the reflection light reflected by the reflector and a direct light exiting from the light guiding member without reflection at the reflector. The light guiding member includes an incidence surface where the light from the light source enters; and an exit surface where the light entered from the incidence surface exits. The reflector is disposed at a position in a direction that light intensity of light emitting from the light source becomes the strongest.

主权项

1. A light irradiation system for irradiating light to an irradiation area extending in a main scanning direction of a document face when placed on an image scanning apparatus, comprising:
a light source; a light guiding member to guide light emitted from the light source; and a reflector to reflect a part of light, exiting from the light guiding member, to the document face as first light, wherein the irradiation area is irradiated by the first light reflected from the reflector and second light exiting from the light guiding member to the document face directly without reflection at the reflector, wherein the light guiding member includes: an incidence surface where the light from the light source enters; an exit surface where the light entered from the incidence surface exits to either the document face directly or the reflector; a first side face extending from the incidence surface; a second side face opposite the first side face and extending from the incidence surface, wherein a distance between the first and second side faces increases in a direction extending away from the incidence surface; a third side face extending from the first side face on a continuous plane to the exit surface; and a total reflectance face opposite the third side face and extending from the second side face on a continuous plane to the exit surface, wherein a distance between the total reflectance face and the third side face increases in a direction extending away from the first and second side faces, wherein the reflector is disposed at a position in a direction that light intensity of light emitting from the light guiding member becomes the strongest; and wherein light exiting from the light guiding member and then directed to a reflection face of the reflector, and light exiting from the light guiding member and directly irradiating a document without reflection by the reflector exit from the exit surface.