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压电声笔是各种声坐标录取装置的重要组成部分,高性能的声笔对于该装置的接收机和其它信号处理部分的研制会带来很大的方便,对装置的有效工作面积有直接的影响,对整机的精度有重要的作用。本文主要介绍从波动方程入手,根据变幅杆原理进行超声笔设计的方法。并根据实用要求测试了声笔的性能:工作频率为200kHz,垂直于工作面的水平指向性为360°,可以在与工作面的夹角为30°—90°的任何正常书写角度上使用,它发出的声信号强度比普通声笔(非变幅杆型)大6倍以上,并测定了几个典型点的振幅值,振幅放大系数大于6。符合设计要求,已在某些声坐标录取装置上获得了满意的应用。如按半波长振子的原理并配以简单的结构,能够很方便地获得当笔尖发射超声的同时,还能在传输介质的表面上留下笔迹,使用方便自由,外形和尺寸与普通钢笔相似。
Piezoelectric sound pen is an important part of all kinds of acoustic coordinate recording device. The high-performance acoustic pen brings great convenience to the development of the receiver and other signal processing parts of the device. It has a direct effect on the effective working area of the device The impact of the accuracy of the whole machine has an important role. This article describes the wave equation from the start, according to the principle of horn ultrasonic pen design method. The performance of the voice pen was tested according to practical requirements: the operating frequency is 200 kHz, the horizontal directivity perpendicular to the working face is 360 °, and the angle can be used at any normal writing angle of 30 ° -90 ° with the working face, The sound signal intensity it emits is 6 times more than that of a normal sounding pen (non-horn type), and the amplitude values of several typical points are measured, and the amplitude amplification coefficient is larger than 6. Meet the design requirements, has been in some sonic coordinate recording device has been applied satisfactorily. If according to the principle of half-wave oscillator and with simple structure, can easily get the pen tip ultrasonic emission, but also in the transmission medium surface left handwriting, easy to use, shape and size similar to ordinary pen.