Page 67 - 《应用声学》2019年第6期
P. 67

第 38 卷 第 6 期                                                                       Vol. 38, No. 6
             2019 年 11 月                         Journal of Applied Acoustics                 November, 2019

             ⋄ 研究报告 ⋄



                          电磁激励器屏幕发声系统的数理模型





                                                   耿 丽    1†   屈 胜     2



                                          (1 南通理工学院电气与能源工程学院          南通   226002)
                                            (2 上海诺基亚贝尔股份有限公司        南京   210000)

                摘要    目前，全面屏手机已经成为一种趋势。为提升全面屏的用户体验效果，业界开发了屏下指纹识别、伸缩
                式摄像头等技术，对于音频 (主要是语音通话)，则开发了基于压电陶瓷和电磁激励器的两种屏幕发声方案，其
                代表产品分别为小米 MIX 与 VIVO NEX。该文针对电磁激励器屏幕发声技术，分别从平板弯曲振动、平板声
                辐射、电磁激励器阵列驱动等模型出发，推导电磁激励器驱动屏幕振动发声的原理以及简化的力电类比等效
                线路图；给出仿真与实测频响曲线以及某型号手机语音通话测试数据；最后简要归纳电磁激励器屏幕发声的
                设计指南以及进一步的研究方向。
                关键词     电磁激励器，平板弯曲振动，平板声辐射，电磁激励器驱动阵列
                中图法分类号: TB5           文献标识码: A          文章编号: 1000-310X(2019)06-0969-11
                DOI: 10.11684/j.issn.1000-310X.2019.06.009




                The mathematical-physical model of electro-magnetic actuator screen sound

                                                         system


                                                  GENG Li  1  QU Sheng 2

                     (1 School of Electrical and Energy Engineering, Nantong Institute of Technology, Nantong 226002, China)
                                     (2 Nokia Shanghai Bell Company Ltd., Nanjing 210000, China)

                 Abstract  Full screen or full display mobile phone has become a trend. In order to improve user experience
                 effect, the industry has developed some specific technologies, such as fingerprint recognition under screen,
                 telescopic camera etc. For audio (mainly voice calls), two kinds of screen voice schemes based on piezoelectric
                 (PZT) and electro-magnetic actuator (EMA) have been developed. The representative products are MI MIX
                 and VIVO NEX respectively. This paper, aiming at EMA screen sound technology, deduces the EMA screen
                 sound principle and simplified mechanical-electrical analog equivalent circuit from flat-panel bending vibration,
                 flat-panel sound radiation, EMA array-driven and other models. Then the application of frequency response
                 (FR) simulation in EMA screen vocalization and the actual measurement data of a certain mobile phone are
                 introduced. Finally, this paper concludes the design guidelines of the EMA screen sound and the further
                 research direction.
                 Key words Electro-magnetic actuator, Flat-panel flexural vibration, Flat-panel sound radiation, Electro-
                 magnetic actuator array-driven


             2019-01-10 收稿; 2019-09-11 定稿
             作者简介: 耿丽 (1978- ), 女, 江苏宿迁人, 硕士, 讲师, 研究方向: 信号处理、应用电子技术。
              通讯作者 E-mail: m13913998581@163.com
             †
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