| 摘要 |
PROBLEM TO BE SOLVED: To provide a lighting device using a light guide plate which can be used in high temperature and at low cost.SOLUTION: The lighting device 10 includes the light guide plate 11 formed of a material with a light-transmitting property such as rectangular glass having one surface 12a and the other surface 12b opposite to the one surface. The light guide plate 11 made of the glass has printed dot patterns (dot-like printed patterns) 13a, 13b, 13c, and 13d arranged on one surface 12a side of the light guide plate 11, and printing of the dot patterns is performed using a ceramic ink. |
