压电式蜂鸣器构造与原理介绍 | ||
| 代码转换 | PIEZO BUZZER 谢宇风 | |
以下为两种压电蜂鸣片的固定方式: | ||
聚四氟乙烯乳液a. | 外围支持方式-将蜂鸣片外径边缘固定于共振腔内，一般采无回授式蜂鸣片,而其蜂鸣片须与共振腔频率搭配,才会有较高的音压输出,并由外部振荡电路产生推动信号,使蜂鸣器发出声音. | |
b. | 节点支持方式-将蜂鸣片固定于约与陶瓷片直径同尺寸的环形结构内。若共振腔设计得宜,并搭配频率正确的回授式蜂鸣片与正回授电路,将可产生较大音压及正确的频率。 | |
以上两种方式都需以硅胶粘合蜂鸣片于机构中。 | ||
Piezo buzzer structure and theory introduction | ||
Piezoelectoric ceramic buzzer element have a simple structure in which piezoceramic element is glued to vibration plate. When alternating voltage is applied to piezoceramic element, the element expands or shrinks diametrically. This characteristic is utilized to make vibration plated bend to generate sounds. | PIEZO BUZZER | |
The acoustic generating method can be roughly divided into self-drive oscillation method and external-drive oscillation method. The former shows the lowest impedance on the acoustic generator, and produces the sound by the positive feedback oscillation circuit to make resonance. Thereby, big sound pressure can be obtained by a simple circuit. While the latter selects an optional frequency and makes sound by the nonstable multivibrator, and it is used for the case having the oscillation circuit. | ||
自动点火器There are 2 support methods for piezoelectric ceramic buzzers products. | ||
| 雀榕叶 a. | Circumference Fixing Method-This method is to fix the outside circumference of the buzzer element to the supporting ring of the plate. Considerable sound pressure can be obtained covering a wide frequency range around the resonant frequency. | |
b. | Nodal Mounting Method-This Method is to fix the nodal diameter of the buzzer element to the supporting ring of the plate. Loud sound pressure can be obtained. Flexible adhesives, such as silicon rubber, should be used between the buzzer element and the support ring. | |
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