| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for expanding a frequency band, especially a high-frequency band, regenerated by a micro-speaker used for audio output of a vibration actuator that is used for portable communication tools and can output vibration signals and audio signals, and of a portable TV game, without enlarging the size of a device. SOLUTION: A sub-cone that operates in a frequency band from several kHz to 15 kHz is attached to the front surface of the diaphragm of the vibration actuator or the micro-speaker. Thereby the frequency band can be expanded without increasing a production cost significantly and enlarging the size of the device.
|
