| 摘要 |
Provided is an edge-light-type illumination device with which it is possible to suppress unevenness in luminance in the vicinity of a joint between respective end surfaces of adjacent light guide plates, even in a configuration where respective end surfaces of a plurality of light guide plates are connected. Disclosed is an edge-light-type illumination device in which a light-emitting unit is provided to an incident end surface of a light guide plate, wherein: the light guide plate (2) has a plurality of grooves (6) that are formed in the bottom surface thereof at predetermined pitches and that are parallel to an X-axis direction, and a plurality of ridges (7) that are formed on an emission surface at predetermined pitches and that are parallel to a Y-axis direction; and each groove (6) formed in the bottom surface of the light guide plate (2) has a V-shaped cross section, the vertex angle thereof being formed at an angle of 65° to 105°. In cases of connecting a plurality of the illumination devices along the X-axis direction: the illumination devices are held by providing a gap of 1 to 2 mm at the joint part (A) between the respective end surfaces, along the Y-axis direction, of adjacent light guide plates (2); no LED is provided near the incident end surface (2a) in the vicinity of the joint part (A); and LEDs (8) are provided at predetermined intervals on the incident end surface (2a) side at a predetermined distance (d1) away from the joint part (A). |
