| 摘要 |
PROBLEM TO BE SOLVED: To provide a lighting device that can improve luminous efficiency.SOLUTION: A lighting device comprises: a case having an opening surface on the front end side; a heat sink that includes a bottom part at which an LED module is placed, a cylindrical wall part erected from the bottom part and arranged so as to form a clearance between the cylindrical wall part and the inside wall surface of the case, and an opening end formed at the front end of the cylindrical wall part, and that is attached so that the opening end is located on the opening surface side of the case; a fan housed in the case so as to be opposed to the outer surface of the bottom part of the heat sink; an intake passage guiding air to the fan after the air is introduced from the lateral side of the case to the inside; and an exhaust passage formed along the outer surface of the bottom part of the heat sink and the outside wall surface of the cylindrical wall part so as to exhaust the air from the fan to the outside via the front end side of the heat sink. |
