| 摘要 |
PROBLEM TO BE SOLVED: To provide a light source device capable of achieving inhibition of warping of a printed circuit board while suppressing cost increase and environment load increase.SOLUTION: A light source device comprises: a long printed circuit board having one surface on which a wiring pattern is formed; and a light-emitting element soldered to the wiring pattern on one surface of the printed circuit board. First expansion restriction parts formed to extend in a longitudinal direction of the other surface of the printed circuit board are printed on both ends of the other surface in parallel to the longitudinal direction, respectively. |
