LIGHT GUIDE DEVICE

To form a linear or band-like slender light emission pattern without point light appearing at an emission part and with good appearance.SOLUTION: A light guide plate 12 of a three-dimensional shape is provided with an incident part 18; reflection parts 23 and 24, light relay part 29 and 31, and an exit part 27. Light emitted from a light source 17 is distributed from the incident part 18 to a first light guide part 13 and a third light guide part 15, is transferred from the first reflection part 23 to a second light guide part 14 via the first light relay part 29, is also transferred from the second reflection part 24 to the second light guide part 14 via the second light relay part 31, and exits from the exit part 27 of the second light guide part 14 to an outside of the light guide plate 12. A step is formed at the reflection parts 23 and 24, light from the incident part 18 is caused to extend along a circumferential surface of the light guide plate 12 on a rear side, and the exit part 27 is caused to emit the bright light.SELECTED DRAWING: Figure 4 【課題】出射部の点光りをなくし、見栄えのよい線状または帯状の細長発光パターンを形成する。【解決手段】３次元形状の導光板１２に、入射部１８、反射部２３，２４、光中継部２９，３１、出射部２７を設ける。光源１７の発光を入射部１８から第１導光部１３と第３導光部１５に分配し、第１反射部２３から第１光中継部２９を介して第２導光部１４に転送するとともに、第２反射部２４から第２光中継部３１を介して第２導光部１４に転送し、第２導光部１４の出射部２７から導光板１２の外部に出射する。反射部２３，２４にステップを形成し、入射部１８からの光を導光板１２の後側周面に沿って広げ、出射部２７を明るく発光させる。【選択図】図４