| 摘要 |
PROBLEM TO BE SOLVED: To provide a long-life LED lighting device which is lightweight and hard to be affected by heat degradation.SOLUTION: A plurality of tabular radiation fins 4 extended outward and formed from an outer peripheral wall of a cylindrical body 3 are provided with gaps in between in a peripheral direction of the cylindrical body 3 to form a heat sink 2 integrating the cylindrical body 3 with the radiation fins 4. A substrate 5 is provided on one end side of the cylindrical body 3, the cylindrical body 3 and the radiation fins 4 are disposed on one surface side of the substrate 5, a substrate surface 16 side opposite the surface where the radiation fins 4 of the substrate 5 are disposed is a surface thermally connected to a plurality of LED light sources 6 disposed with gaps in between, and electronics related equipment 10 including a power supply of the LED light sources 6 is housed inside the cylindrical body 3. The heat sink 2 is formed by connecting heat sink formation parts 8a, 8b via insulation members 9 lower than the cylindrical body 3 in thermal conductivity, the upper side heat sink formation part 8b is thermally connected to the electronics related equipment 10, and the lower heat sink formation part 8b is in a non-connection state.SELECTED DRAWING: Figure 1 |
