| 摘要 |
PROBLEM TO BE SOLVED: To make a directional characteristic of light transmitted through an emission optical pattern the same as a directional characteristic of a deflection pattern provided at a light guide plate, in the light guide plate having a light introduction part.SOLUTION: A light guide plate 33 comprises: a plate-shaped light guide plate body 35; and a wedge-shaped light introduction part 34 integrally molded at an end of the light guide plate body 35. At an upper surface of the light introduction part 34, an inclined surface 38 is formed, and in the light introduction part 34, the thickness becomes gradually thinner from a light incident end surface side toward the light guide plate body 35. On a light emission surface 39 of the light guide plate body 35, a plurality of emission prisms 40 are formed for changing a directional characteristic of light emitting from the light emission surface 39 in a width direction, and the emission prisms 40 extend in the direction vertical to the light incident end surface 36. A directional characteristic of the light transmitting through the emission prisms 40 and emitting is the same characteristic as the directional characteristic of light reflecting on an opposite surface of the light emission surface 39 and emitting from the light emission surface 39. |
