| 摘要 |
PROBLEM TO BE SOLVED: To provide a lighting device including a light guide plate, capable of ensuring uniform plane emission by suppressing occurrence of luminance unevenness resulting from a positional deviation between a semiconductor light-emitting element and the light guide plate.SOLUTION: A lighting device 1 is configured by stacking a mounting substrate 20 on which LEDs 22 are mounted so as to form an annular element sequence Q; a reflection member 30; and a light guide plate 40 including an annular light incident portion 42. A first fitting target portion (convex portion 410) of the light guide plate 40 is fitted into a first fitting portion (fitting hole 310) of the reflection member 30. Second fitting portions (an inner boss 311, an outer boss 312, and a columnar boss 313) of the reflection member 30 are fitted into second fitting target portions (an inner hole 210, an outer hole 211, and a pore 212) of the mounting substrate 20, respectively. By fitting the first fitting target portion into the first fitting portion and fitting the second fitting portion into the second fitting target portion, a center Oof the light incident portion 42 is aligned to a center Oof the annular element sequence Q of the LEDs 22 in a plan view. |
