| 摘要 |
PROBLEM TO BE SOLVED: To cool a heat generating electronic component efficiently with air introduced externally.SOLUTION: A housing 2 of an electronic controller 1 has a case member 4 for holding a circuit board 3, and a cover member 5 covering the circuit board 3 held by the case member 4. A ventilation passage 13, interconnecting the inside and outside of the housing 2, is formed in the case member 4. The ventilation passage 13 is formed at a position where its one end opening 15 faces the tip of a heat generating electronic component 12 mounted on the circuit board 3. An upright wall 14 projecting toward the heat generating electronic component 12 is formed at the outer peripheral edge of one opening 15 of the ventilation passage 13. Consequently, the air introduced from the ventilation passage 13, interconnecting the inside and outside of the housing 2, is guided toward the heat generating electronic component 12 by the upright wall 14, and can cool the heat generating electronic component efficiently. |
