Each microactuator consists of two PT arms that are jointed at the free end and connected to an anchor at the fixed end. 该微驱动器由两个光热膨胀臂构成，两者在自由端相互连接，而在固定端分别通过细桥与基底相连。
Another theory is that having a greater mass under the fixed end of the reed somehow improves the vibratory properties of the reed itself. 还有一个理论认为簧片固定端下面较大的质量会提升簧片的振动特性。
