Patent ID: 8488216
Filing Date: 2013-07-16
Classification: G02B,H04N

Abstract:
1. An LED light source device installed in an image reading apparatus, comprising: an LED that is a light-emitting source; and a light guide for reflecting light of the LED by an inner surface thereof to diffuse along a main scanning line direction and irradiating the light reflected by the light guide to a surface of a sheet, wherein the light guide has a plurality of reflecting surface bodies spaced at predetermined pitches in the main scanning line direction inside an inner surface reflection optical path of the light guide to reflect the light from the LED toward an outside of the light guide along the main scanning line direction, the plurality of reflecting surface bodies includes a first reflecting surface body present at one end side in the main scanning line direction and a second reflecting surface body present at a center part the main scanning line direction, and a length in a perpendicular direction to the main scanning line direction of the second reflecting surface body is different from that of the first reflecting surface body.