| 摘要 |
PROBLEM TO BE SOLVED: To provide an indicating lamp which is improved in the use efficiency of light, down-sized, and can be reduced in electric power consumption. SOLUTION: In this indicating lamp, a linear light source 17 is arranged facing an introduction surface of a tabular light guide plate 11; a reflection plate 12 is placed on the reflecting surface side of the light guide plate 11; and a diffuser 13 is arranged on the light-exiting side of the light guide plate 11. On the surface side of the diffuser 13, a 1st- and a 2nd prism sheets 14, 15 are arranged in piles. The light introduced into the light guide plate 11 and made to exit transmits the diffuser 13, the 1st and 2nd prism sheets 14, 15, repeating diffusion and condensing, and irradiates the display board 16 efficiently. |
