Patent ID: 7548352
Filing Date: 2009-06-16
Classification: G03G,H04N

Abstract:
1. An illumination device, which is used in a document-reading device configured to irradiate light over at least a predetermined illumination width including a reading area having a predetermined reading width extending in a main scanning direction of a document and to read the light reflected from the document using an image-reading element, the illumination device comprising: a point light source; a light-guiding member having an incident surface opposed to a light-emitting surface of the point light source and a light-emitting surface opposed to the reading area; a carriage configured to shift an illumination area in a sub-scanning direction; and a support base configured to support and hold the point light source and the light-guiding member together as a unit, and to be attached to the carriage adjustably in the sub-scanning direction, wherein an illumination area generated by the light irradiated from the point light source has a high illuminance distribution range of a substantially constant illuminance, and the high illuminance distribution range coincides substantially with the reading area.