为了提高压电微机电系统(MEMS)扬声器的声压级，该文提出了一种新型的扬声器振膜结构，该结构由4个相同的扇环驱动单元和中间圆形质量块组成，并在上表面覆有一层柔性材料，形成刚性-柔性耦合封闭振动膜。优化该结构中圆形质量块半径r2和相邻扇环的相邻边夹角θ等参数。结果表明，当θ=50°，r2=700 μm时，声压级最大。在保证振膜面积相同和谐振频率基本一致的情况下，与优化后的固支圆形多层振膜相比，该文所提出的新型结构声压级高5 dB。

In order to improve the sound pressure level(SPL) of piezoelectric micro-electro-mechanical systems(MEMS) speakers, a novel speaker diaphragm structure is proposed in this paper, The structure consists of four identical fan-ring driving units and a circular mass block in the middle, and the upper surface is covered with a layer of flexible material, forming a rigid-flexible-coupling sealed vibration membrane, The parameters such as radius r2 of the circular mass block and angle θ of adjacent fan rings were optimized, It was found that the maximum SPL was obtained when θ=50° and r2 =700 μm, The sound pressure level of the novel structure proposed in this paper is 5 dB higher than that of the optimized clamped circular multilayer diaphragm under the condition that the diaphragm area is the same and the resonant frequency is basically the same,