| 摘要 |
PROBLEM TO BE SOLVED: To increase light quantity of a light source located on the deepest side of a reflecting mirror without increasing a current value by forming an internal surface on a depth side in the reflecting mirror by two flat reflecting surfaces to be V-shaped in cross section in a surface direction of a light guide plate. SOLUTION: A reflecting mirror 3 mounted on an end face of a light guide plate 2 is formed into a curved shape in cross section opened to the one end face side and an internal surface on a depth side is formed by two flat reflecting surfaces 3a to be V-shaped in cross section in a surface direction A of the light guide plate 2. A R light source 4 arranged on the internal surface of the reflecting mirror 3 is arranged at a first nearest to the light guide plate 2, G light beam 5 is arranged at a second nearest and a B light source 6 is at a third nearest. Because light in upper and lower areas 6b on the depth side of the B light source 6 is reflected toward a gap S in a united state without being much scattered by two reflecting surfaces 3a because the internal surface on the depth side in the reflecting mirror 3 is formed by these two flat reflecting surfaces 3a of V-shapes in cross section, and light as it is can be guided to the light guide plate 2. |
