| 摘要 |
PROBLEM TO BE SOLVED: To provide a lighting device which includes heat radiation fins achieving high heat radiation performance and achieves high cooling performance.SOLUTION: The lighting device includes: an outer guard 1 including a planar light source 3, a heat sink 1b having an attachment surface 1e, to which the planar light source 3 is attached, at the front end side, a cylindrical outer wall 1a which covers an outer periphery of the heat sink 1b with an annular space therebetween, and multiple heat radiation fins 1c forming multiple passages A2 which are provided between the heat sink 1b and the outer wall 1a, divide the annular space in a circumferential direction, and extend in a fore and aft direction; and an inner body 4 which is formed into a cylindrical shape, has a flange part 4b at the front end side, the inner body 4 in which the rear end side is fixed to an attachment surface 4e and a reflector 5 is stored. The outer wall 1a and the heat radiation fins 1c are extended to an area near the flange part 4b at the front end 1f side to form an annular air inflow port A1 with the flange part 4b. |
