Patent ID: 8610967

Claim:
An illumination apparatus for an image reading apparatus which receives light from a reading range and acquires an image, the illumination apparatus comprising: a first light source module which includes a light-emitting module that emits light, the light-emitting module having a line shape; and a first reflection member which includes a first reflection surface that reflects the light emitted from the light-emitting module of the first light source module for the reading range, wherein the first reflection surface has a cross section that has a zigzag line shape including a plurality of line segments running along a standard oval, which has a major axis that forms a predetermined angle with a direction perpendicular to the reading range, in a direction perpendicular to a longitudinal direction of the light-emitting module of the first light source module, the light-emitting module of the first light source module is disposed in a position of a first focus of the standard oval, the first reflection member is disposed so that the reading range arranged within limits beforehand set up on an imaging optical axis of the image reading apparatus from a second focus of the standard oval, and the cross-sectional zigzag line shape is formed by tangents of the respective intersection points of the standard oval and lines drawn from the second focus of the standard oval at equal angles to the standard oval.