| 摘要 |
PROBLEM TO BE SOLVED: To prevent the generation of the stripe of light on a light outgoing face caused by the burr formed in the molding, by mounting a stepped part on a surface on which the diffusion pattern of the light guide plate is formed, between a light incident face of the light conductive plate and the diffusion pattern forming area, whereby the light incident face side is retreated from the diffusion pattern formation area side. SOLUTION: A light guide plate 33 molded with a die comprises a stepped part 29 between a diffusion pattern formation area 31 formed with a diffusion pattern 5 and a lower face of the light incident part 32 near the light incident face 8, and the diffusion pattern formation area 31 is lowered by one stage. A projecting stripe (burr) 30 produced in the molding of the light guide plate 33 is formed on a lower end portion of the stepped part 29, caused by a gap between a lower die and a stamper. Whereby the stepped part 29 is shaded by the projecting stripe 30 when observed from the direction of the light incident face 8, and the light (f) is not applied to the convex stripe 30. Accordingly the generation of the stripe of light onto the light outgoing face 20 caused by the reflection of the light applied to the projecting stripe 30, can be prevented. |
