| 摘要 |
PROBLEM TO BE SOLVED: To eliminate plating process and improve vertical visibility by providing a first transparent member with first and second surfaces, the first surface being disposed so that beam light for ma first LED is incident, having a plurality of stepwise refraction faces, and the second surface having a reflection face for reflecting the beam light from the first LED. SOLUTION: A plurality of LEDs 1 are disposed linearly at given intervals inside of a case 3. A transparent member 2 having a refraction face 2 having a plurality of stepwise refraction face 20 to 28 and reflection face 2b are provided so that lights from the Leeds 1 are incident. Thereby, since a vertical radiation angle being radiated to the periphery can be widened more than an effective radiation angle of the LEDs 1, vertical visibility can be improved. A reflection face can be of tained without applying plating process, as a result cost required for plating process can be reduced, therefore, the costs of the whole product can be reduced. |
