| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a light guide plate in which the boundary between a prescribed region having a plurality of recessed portions and the region with no recessed portions is clear, a lighting system having the light guide plate, and a manufacturing method of the light guide plate. <P>SOLUTION: As for the light guide plate 20, light incident from a side face is bent by a bending dot 32 installed in a diffusion region 30 and a groove part 34, and is led out mainly from a principal face. In this case, the groove part 34 is installed in a position surrounding the outer periphery of the diffusion region 30, the outer periphery of the diffusion region 30 can be made clearer compared with the case wherein only the bending dots 32 are installed in the diffusion region 30. In addition, in a case a diffusion region 30 of S-shape is formed by using an ultrasonic processing horn in which a plurality of processing dots are arranged in matrix shape, the bending dots 32 are not always located in the outer periphery of the diffusion region 30, thereby, an effect of installing the groove part 34 is great. <P>COPYRIGHT: (C)2012,JPO&INPIT |
