| 摘要 |
PROBLEM TO BE SOLVED: To provide a lighting device capable of attaining a long life by improving heat radiation.SOLUTION: A lighting device is provided with a base 2 connected to a commercial power source, a heat sink 10 which is formed in a cylindrical shape, connected to the base 2 and has an opening 10a on its circumferential face, a heat radiation plate 13 for sealing an upper face of the heat sink 10, a light source 7 of an LED arranged on the heat radiation plate 13, a duct 14 which is arranged along the heat radiation plate 13 and faces the opening 10a, and an air-blowing fan 20 arranged in the duct 14. An air-flow flowing from the opening 10a to the duct 14 by the driving of the air-blowing face 10 passes along the heat radiation plate 13 and is sent out through the opening 10a. |
