| 摘要 |
PURPOSE:To improve the sound quality by bonding a piezoelectric member containing different electrodes to a common diaphragm and driving these different eletrodes with different frequencies. CONSTITUTION:A common diaphragm 1 is used as an electrode at one side, and two electrodes 3 are formed on a piezoelectric member 2 bonded to the diaphragm 1. This diaphragm 1 of a piezoelectric buzzer 16 is set at a VDD level, and both electrodes 3 are driven by the signals given from a single frequency generating system respectively. Two acoustic signals having different frequencies are mixed audibly by the diaphragm 1. In such a way, the sound quality is improved. |
