Multifunction-Type Vibration Actuator And Mobile Terminal Device

摘要

[Problems]To provide a multifunction-type vibration actuator and a mobile terminal device capable of decreasing the lowest acoustic resonance frequency and preventing breakage of a coil lead as well as improving acoustic characteristics and preventing sound leaks. [Means for Solving Problems] A portion near the outer periphery of a diaphragm 3 is bent to form a rising portion 3 b extending along an inner periphery 1 a of a housing 1 toward an open end thereof. This rising portion 3 b serves as a corrugation to decrease the lowest resonance frequency and the amplitude of vibration of which a fulcrum is served by the rising portion 3 b is not so large as that of the corrugation. Accordingly, the coil lead of a voice coil 4 is not easily broken. Furthermore, an extending portion 3 c is formed to extend outward along a flat surface 1 b formed at the open end of a housing 1 from a rising portion 3 b. This enlarges the entire radius of the diaphragm 3 and improves the acoustic characteristics. Moreover, by arranging a flat surface 1 b of a housing 1 parallel to an extending portion 3 c of a diaphragm 3, a gasket can easily be attached.