| 摘要 |
PROBLEM TO BE SOLVED: To provide an LED lighting divice which hardly influences the lowering or the like of a life caused by heat even if incorporated with a power supply, and can be reduced in weight.SOLUTION: A cylindrical region 4 penetrating a penetration hole 2 of a base board 3 is arranged, a plurality of LED light sources 6 are alternately arranged at a single face of the base board 3 with intervals, and a heat sink 8 is arranged at an external peripheral side of the cylindrical region 4 at a base board face 7 side of the opposite side. A ventilation port 9 is formed at a protruded region at the heat sink 8 side of the cylindrical region 4, and an opening 10 is formed at a protruded tip at an LED light source arrangement face 5 side. A power supply 11 of the LED light source 6 can be accommodated in a cylinder of the cylindrical region 4, the power supply 11 is cooled by air which is introduced into the cylinder from the opening 10 when a temperature of air in the cylinder of the cylindrical region 4 is raised by a rise of a temperature of the power supply 11, and derived from the ventilation port 9, the LED light source 6 is cooled by air which flows in the heat sink 8 when a temperature of the base board 3 is raised by the heat of the LED light source 6, and an air flow for cooling the power supply 11 and an air flow for cooling the LED light source 6 are insulated from each other by the cylindrical region 4. |
