| 摘要 |
PROBLEM TO BE SOLVED: To provide a lighting device with an excellent heat radiation effect, a high output and a large light emitting area.SOLUTION: The lighting device comprises: a square housing 7 on which a belt-like bodies 12 having plural retainers 1 are formed into a square cylindrical shape, and that couples ends of the belt-like bodies 12 formed into the square cylindrical shape; and a circuit board 2 mounted to an inner face of the housing 7 and having a light source 3. The circuit board 2 has: mounting parts 2a mounted to the inner face of the housing 7, and having the light sources 3 on its surface; and connection parts 2b that connect the mounting parts 2a, 2a adjacent to each other in a circumferential direction of the housing 7, and can be bent at corners of adjacent inner faces of the housing 7. Rear faces of the mounting parts 2a contact inner faces (mounting faces 5a) of the retainers 1, so that a lighting device can have an excellent heat radiation effect, a high output, and a large light emitting area. |
