Vibration actuator device of portable terminal

摘要

By having multiple air passage holes 10 c in the housing 1 and by creating a clearance G 2 between the outer surface of the yoke 20 and the inner surface of the housing 1, the measurement of the clearance being confined to a range exceeding 0% but not exceeding 2.5% of the inner radius of the housing, the amount of air movement is limited by the clearance G 2, and by this means the frequency range within which the desired acceleration can be attained is expanded.