| 摘要 |
PROBLEM TO BE SOLVED: To effectively prevent the adverse effect by distortion power of thermal shrinkage and to greatly improve durability by easily, rapidly and surely fitting a substrate with many light-emitting diodes. SOLUTION: The signboard of the light-emitting diodes is constituted by inserting the plural light-emitting diodes 4 into through-holes 13A of the substrate 13 and fixing the diodes to home positions. Buffer cylinders 25 are inserted into the through-holes 13A of the substrate 13, and the light-emitting diodes 4 are inserted and fixed to the buffer cylinder 25. The buffer cylinders 25 are formed by molding plastic or rubber into a cylindrical shape. |
