| 摘要 |
PROBLEM TO BE SOLVED: To sufficiently exhaust heats, and restrain influences on electronic components due to a temperature rise.SOLUTION: A lower vent-hole 8 and an upper vent hole 9 are provided on a cover 6, and the vent-hole 8 is covered with a bracket 7.The flow rate of air flowing around the opening of the lower vent-hole 8 lowers, and the airflow speed of the upper vent-hole 9 is higher than that of the lower vent-hole 8. Then, the atmospheric pressure of the upper vent 9 lowers than that of the lower vent-hole 8 through a venturi effect, so that the air can forcedly flow outward from the upper vent-hole 9. After the air enters into an inner space of the cover 6 through the lower vent-hole 8, the air can be exhausted through the upper vent-hole 9. Thereby, heats can be sufficiently exhausted, restraining the influences of electronic components due to a temperature rise. |
