WO2015014155A1 - 一种压电骨导受话器及一种便携式电子设备 - Google Patents

一种压电骨导受话器及一种便携式电子设备 Download PDF

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Publication number
WO2015014155A1
WO2015014155A1 PCT/CN2014/079157 CN2014079157W WO2015014155A1 WO 2015014155 A1 WO2015014155 A1 WO 2015014155A1 CN 2014079157 W CN2014079157 W CN 2014079157W WO 2015014155 A1 WO2015014155 A1 WO 2015014155A1
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WO
WIPO (PCT)
Prior art keywords
piezoelectric
driving
bone conduction
conduction receiver
piezoelectric bone
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PCT/CN2014/079157
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English (en)
French (fr)
Inventor
严笔祥
袁世明
Original Assignee
广东欧珀移动通信有限公司
精拓丽音科技（北京）有限公司
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Application filed by 广东欧珀移动通信有限公司, 精拓丽音科技（北京）有限公司 filed Critical 广东欧珀移动通信有限公司
Publication of WO2015014155A1 publication Critical patent/WO2015014155A1/zh
Priority to US15/010,401 priority Critical patent/US9843866B2/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R17/00—Piezoelectric transducers; Electrostrictive transducers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/03—Constructional features of telephone transmitters or receivers, e.g. telephone hand-sets
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • H04R3/12—Circuits for transducers, loudspeakers or microphones for distributing signals to two or more loudspeakers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2460/00—Details of hearing devices, i.e. of ear- or headphones covered by H04R1/10 or H04R5/033 but not provided for in any of their subgroups, or of hearing aids covered by H04R25/00 but not provided for in any of its subgroups
    • H04R2460/13—Hearing devices using bone conduction transducers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2499/00—Aspects covered by H04R or H04S not otherwise provided for in their subgroups
    • H04R2499/10—General applications
    • H04R2499/11—Transducers incorporated or for use in hand-held devices, e.g. mobile phones, PDA's, camera's

Definitions

  • the present invention relates to a receiver, and more particularly to a piezoelectric bone receiver and a portable electronic device.
  • the air-conducted receiver usually has a local sound pressure of 90 ⁇ 100dB during operation and is quiet in the surrounding environment (such as 50dB). In the general office environment of the left and right, the sound remains about 50dB ⁇ 60dB even if it is transmitted to the surrounding 1m range, which causes the conversation between the callers to be perceived by the surrounding people, resulting in private leakage.
  • Piezoelectric materials are very special substances. When a piezoelectric crystal or a piezoelectric material is deformed by an external force, charge accumulation in a linear ratio with an external force appears on some surfaces thereof. This phenomenon is called a piezoelectric effect. When a piezoelectric crystal or a piezoelectric material is subjected to an external electric field, the piezoelectric crystal or the piezoelectric material is mechanically deformed in a linear relationship with the electric field strength. This phenomenon is called an inverse piezoelectric effect. Due to these characteristics of piezoelectric materials, they have begun to be used in speaker and touch screen technologies.
  • the vibration of sound waves is transmitted to the auditory nerve through two paths, one is air conduction, which is the path that is usually dominant; the other is bone conduction, which is usually insignificant to the formation of hearing.
  • Bone conduction bypasses the outer ear and middle ear, and the sound wave is directly transmitted into the inner ear through the skull.
  • the acoustic vibration generating element is a single (double) piezoelectric chip element composed of a metal plate and a piezoelectric plate bonded thereto. Since the mechanical vibration is driven by the piezoelectric deformation caused by the voltage rather than the current, the Joule heat loss generated by the coil in the electromagnetic type is not accompanied. In addition, since metal parts (magnets and magnetically permeable bowls) are not required, light weight and thin profile can be achieved.
  • Patent CN1627864A (( 2004.12.1 , Japan NEC , piezoelectric type) discloses a piezoelectric bone conduction speaker, and a unimorph element as an acoustic vibration element includes a metal plate and a piezoelectric ceramic piezoelectric plate bonded thereto, in order to improve frequency response, in piezoelectric The surface of the component is covered with a silicone rubber flexible material.
  • Patent CN1627864A The proposed piezoelectric bone conduction device has high impedance and high input voltage, and the resonance frequency is high, so that the reproduction of the low frequency region is insufficient; in addition, since the mechanical quality factor of the vibration system is high, the vibration is generated at a specific frequency. Or weaken. Therefore, the sound reproduction cannot be performed normally naturally.
  • the technical problem to be solved by the present invention is to provide A piezoelectric bone conduction receiver and a portable electronic device, the piezoelectric bone conduction receiver supporting a private conversation mode.
  • a piezoelectric bone conduction receiver comprising: a piezoelectric bone conduction unit driving unit as an acoustic vibration element; and a piezoelectric driving and signal processing circuit connected to the piezoelectric bone conduction receiver driving unit, and a driving signal switching module ;
  • the piezoelectric boneguide driving unit comprises at least two piezoelectric drive bone drive driving modules that can be independently driven;
  • Each of the piezoelectric bone receiver driving modules is respectively connected to the driving signal switching module, and the driving signal switching module is connected to the piezoelectric driving and signal processing circuit;
  • the driving signal switching module is configured to control a phase of a piezoelectric driving signal output from the piezoelectric driving and signal processing circuit to each piezoelectric bone-conductor driving module, so that each of the piezoelectric bone-conductor driving modules receives The resulting piezoelectric drive signal is in phase or reverse phase.
  • the driving signal switching module is an analog switch.
  • the piezoelectric bone conduction unit driving unit is provided with an independently driven first piezoelectric bone conduction receiver driving module and a second piezoelectric bone conduction receiver driving module; a first piezoelectric bone conduction receiver driving module and a second piezoelectric bone
  • the positive signal input end and the negative signal input end of the receiver driving module are both connected to the analog switch, and the analog switch is switched to make the positive signal input end and the negative signal input end of the first piezoelectric bone conduction receiver driving module respectively
  • the positive signal input end and the negative signal input end of the second piezoelectric bone conduction receiver driving module are connected, or the positive signal input end and the negative signal input end of the first piezoelectric bone conduction receiver driving module and the second piezoelectric bone conduction receiver respectively
  • the negative signal input terminal and the positive signal input terminal of the driving module are connected.
  • the piezoelectric boneguide driving module includes a piezoelectric material having a surface coated with an upper electrode layer and a lower electrode layer, a circuit board, and a thin or flexible connecting the upper electrode layer and the lower electrode layer with the circuit board Circuit.
  • the piezoelectric material of the piezoelectric bone conduction receiver driving module is a piezoelectric ceramic material or a piezoelectric organic polymer material.
  • the piezoelectric material is a single layer piezoelectric material, a two-layer composite structure piezoelectric material or a multilayer composite structure piezoelectric material.
  • the flexible circuit is a silver conductive paste, a lead, an FPC or a flexible conductive strip, and the flexible circuit has a contact resistance of less than 5 ohms.
  • a portable electronic device comprising any of the foregoing piezoelectric bone guides.
  • the piezoelectric boneguide drive module is attached to a screen or skin protection lens of the portable electronic device.
  • the piezoelectric bone conduction receiver of the present invention controls the phase of the piezoelectric driving signals of the two piezoelectric bone-conductor driving modules, and the piezoelectric driving signals of the two are in phase in a noisy environment.
  • the volume can be increased, except that part of the vibration is perceived by the user through the bone conduction of the human body, and part of the vibration is transmitted by the air through the conventional two-channel air-acoustic coupling to be perceived by the user; and in a quiet environment, the two can be controlled.
  • the piezoelectric driving signal is out of phase.
  • the sound of the call is mainly perceived by the user through the vibration of the bone conduction, and the part of the air coupling is mostly offset due to the reverse phase of the vibration source, and only a small one is medium and high.
  • Frequency components are transmitted in small areas near the device and are The 1/R law is quickly attenuated, so it can effectively avoid the conversation content being heard by people around, and achieve good call privacy.
  • FIG. 1 is a circuit block diagram of a piezoelectric bone conduction receiver according to a specific embodiment of the present invention
  • FIG. 2 is a schematic structural view of the piezoelectric bone conduction receiver driving module of FIG. 1;
  • FIG. 3 is a schematic structural diagram of a mobile phone according to a specific embodiment of the present invention.
  • Figure 4 is a front view of the mobile phone of Figure 3;
  • Figure 5 is a cross-sectional view taken along line A-A of Figure 4.
  • Figure 6 is a schematic diagram of a signal input terminal of the piezoelectric bone conduction receiver of the mobile phone of Figure 3;
  • FIG. 7 is a circuit configuration diagram of a signal switching module according to an embodiment of the present invention.
  • a piezoelectric bone conduction receiver includes: a piezoelectric boneguide driving unit as an acoustic vibration element, and a piezoelectric driving and signal processing circuit connected to the piezoelectric boneguide driving unit, and further includes a driving Signal switching module
  • the piezoelectric bone-conductor driving unit comprises at least two independently-actuable piezoelectric bone-conductor driving modules.
  • the first piezoelectric bone-conductor driving module 21 and the second bone-conductor driving module 22 are included. ;
  • Two piezoelectric bone conduction receiver driving modules are respectively connected to the driving signal switching module, and the driving signal switching module is connected to the piezoelectric driving and signal processing circuit;
  • the driving signal switching module is configured to control a phase of a piezoelectric driving signal output from the piezoelectric driving and signal processing circuit to each piezoelectric bone-conductor driving module, so that each of the piezoelectric bone-conductor driving modules receives
  • the piezoelectric drive signals are in phase or opposite phase.
  • the first piezoelectric bone conduction sensor driving module 21 and the second bone conduction receiver driving module 22 Each includes a piezoelectric material 2C having a surface coated with an upper electrode layer and a lower electrode layer, a circuit board 2A, and a thin or flexible circuit 2B connecting the upper electrode layer and the lower electrode layer to the circuit board.
  • the contact resistance is preferably less than 5 ohms.
  • Piezoelectric material 2C can be made of piezoelectric ceramic material (such as lead zirconate titanate piezoelectric ceramics, PZT) or piezoelectric organic polymer materials (such as polyvinylidene fluoride).
  • the structure of the piezoelectric material can adopt a single layer structure, a double layer composite structure or a multilayer composite structure, and the multilayer piezoelectric ceramic can greatly reduce the driving voltage, for example, using 5 layers of 20 ⁇ m PZT
  • the piezoelectric ceramic forms a multi-layer composite structure with a thickness of 0.1 mm, which can adopt a driving signal with an effective value of 5 V.
  • the signal voltage is much lower than the safe voltage of the human body, and the safety of the user can be ensured; the circuit board 2A is used in this embodiment.
  • the copper foil electrode 2B is connected to the piezoelectric material 2C and the circuit board 2A, and the connection method is as follows: pre-coating conductive material (such as epoxy-based silver conductive adhesive DC80B) on 2B, 2A and 2C Through the thermosetting epoxy resin Loctite3212 (the adhesive can be cured by hot air or drying tunnel in a very short time) bonding; due to the epoxy adhesive properties and ceramics and circuit boards (FR4 Epoxy board) approximation ensures better vibration coupling and connection reliability.
  • the board 2A has a width of 1.2 mm and a length of 15 mm.
  • the bone guide receiver of the embodiment can be applied to a mobile phone, a tablet computer, and an MP3.
  • a mobile phone a tablet computer
  • an MP3 a mobile phone
  • the present invention is further described below by taking a mobile phone as an example:
  • the first piezoelectric bone conduction receiver driving module 21 and the second bone conduction receiver driving module of the piezoelectric bone conduction receiver of the embodiment 22 Symmetrical setting on the top of the phone body 3, attached to the phone screen 1 (Also the surface protective glass) the lower surface.
  • the piezoelectric driving and signal processing circuit of the piezoelectric bone conduction receiver is connected with the mobile phone main board, receives the audio signal sent by the mobile phone main board, and converts the audio signal into a piezoelectric driving signal and sends the driving signal to the two bone conduction receivers through the driving signal switching module. Module.
  • the piezoelectric signal input end of the first piezoelectric bone conduction sensor driving module 21 is a positive electrode 211 and a negative electrode 212.
  • the piezoelectric signal input end of the second piezoelectric bone conduction receiver driving module 22 is a positive electrode 221 and a negative electrode 222, and when the positive electrode 211 and the positive electrode 221 are connected, the negative electrode 212 and the negative electrode 222 Connected, then two bone conduction receiver drive modules can achieve the same phase signal drive; when the positive pole 211 and the negative pole 222 are connected, the negative pole 212 and the pole 221 Connected, then two bone conduction receiver drive modules can achieve anti-phase signal drive. Switching between the two modes can be achieved by switching with the signal switching module.
  • the driving signal switching module can adopt an analog switch, and the four terminals L1 and L2 of the analog switch. , L3 and L4 are respectively connected to the positive electrode 211 of the first piezoelectric bone conduction device driving module, the negative electrode 212, the positive electrode 221 of the second piezoelectric bone conduction receiver driving module, and the negative electrode 222 Connection, wherein the terminals L1 and L2 are also respectively connected to the positive and negative outputs of the piezoelectric drive and signal processing circuit PA; by controlling the control signals C1 and C2 of the analog switch That is, the switching of the foregoing two modes can be realized, as follows:
  • the portable electronic device of the present invention can realize two communication modes: standard mode and private mode through software or hardware control.
  • standard mode the driving signals of the two bone conduction receiver driving modules are in phase, which can be improved.
  • private mode the driving signals of the two bone conduction receiver driving modules are reversed in phase (the same amplitude and opposite phase), which improves the confidentiality of the call privacy in a quiet environment.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Piezo-Electric Transducers For Audible Bands (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Telephone Set Structure (AREA)

Abstract

一种压电骨导受话器和一种便携式电子设备，所述压电骨导受话器包括：作为声振动元件的压电骨导受话器驱动单元、以及与所述压电骨导受话器驱动单元连接的压电驱动与信号处理电路，还包括驱动信号切换模块；压电骨导受话器驱动单元至少包括两片可独立驱动的压电骨导受话器驱动模块；各个压电骨导受话器驱动模块分别与驱动信号切换模块连接，驱动信号切换模块与压电驱动和信号处理电路连接；驱动信号切换模块用于控制自所述压电驱动和信号处理电路输出至各个压电骨导受话器驱动模块的压电驱动信号的相位，以使得各个所述压电骨导受话器驱动模块接收到的压电驱动信号为同相位或反相位。上述压电骨导受话器和便携式电子设备具有提升通话私密性的有益效果。

Description

一种压电骨导受话器及一种便携式电子设备
技术领域
本发明涉及受话器，尤其是涉及一种压电骨导受话器及一种便携式电子设备。
背景技术
随着智能手机的普及，当前手机的屏幕越来越大，而且手机越来越薄。传统的动圈式受话器（也即听筒）由于结构复杂，很难实现小型化和薄型化。而且由于传统动圈式受话器的工作原理为振膜推动空气振动产生声音，在应用结构设计上必须保留供空气传导的开孔，破坏了整个设备的外观，并容易产生灰尘或水分进入设备的隐患。
由空气传导的受话器在工作时局部声压通常在 90~100dB 左右，在周围环境较安静（如 50dB 左右的一般办公环境下）声音即使传递到周围 1 米 范围也仍保留有约 50dB~60dB ，导致通话者间的交谈内容被周围人感知，导致私密泄漏。
压电材料是种非常特殊的物质，当压电晶体或压电材料受到外力而发生形变时，在它的某些表面上出现与外力成线性比例的电荷累积，这个现象称为压电效应。而当压电晶体或压电材料受到外电场的作用时，压电晶体或压电材料产生于电场强度成线性关系的机械形变，这个现象称为逆压电效应。由于压电材料的这些特性，其已经开始应用于扬声器及触摸屏技术中。
声波的振动，通过两种路径传递到听神经，一条是气传导，这也是通常情况下占绝对优势的路径；另一条是骨传导，在通常情况下对听觉的形成微不足道。骨传导绕开了外耳和中耳，声波经颅骨直接传入内耳，有移动式和挤压式二种方式，二者协同可刺激螺旋器引起听觉。
骨传导途径：
声波 → 颅骨 → 骨迷路 → 内耳淋巴液 → 螺旋器 → 听神经 → 大脑皮层听觉中枢。
目前骨传导产品和人体接触部分有许多，如牙齿、肩部、耳骨、后脑、乳突等。
压电式机电转换器，声振动发生元件为单（双）压电晶片元件，由金属板和粘合在其上的压电板构成。由于机械振动是由电压而非电流引起的压电变形驱动的，故不会伴随有电磁型中线圈产生的焦耳热损耗。此外，由于不需要金属部件（磁铁和导磁碗），可以实现重量轻和型面薄。
专利 CN1627864A （（ 2004.12.1 ，日本 NEC ，压电式）公开了一种压电式骨导扬声器，作为声振动元件的单压电晶片元件包括金属板和粘合其上的压电陶瓷压电板，为了改善频响，在压电元件表面覆着硅橡胶柔性材料。
专利 CN1627864A 所提出的压电骨导器件具有高阻抗和高输入电压，谐振频率较高，使得低频区域的再现不充分；此外，由于振动系统的机械品质因数很高，在特定频率上振动的产生被加强或削弱。从而不能自然正常地执行声音再现。
发明内容
本发明所要解决的技术问题是，提供 一种压电骨导受话器及一种便携式电子设备，该压电骨导受话器支持私密通话模式。
本发明通过以下技术手段解决前述技术问题：
一种压电骨导受话器，包括：作为声振动元件的压电骨导受话器驱动单元、以及与所述压电骨导受话器驱动单元连接的压电驱动与信号处理电路，还包括驱动信号切换模块；
所述压电骨导受话器驱动单元至少包括两片可独立驱动的压电骨导受话器驱动模块；
各个所述压电骨导受话器驱动模块分别与所述驱动信号切换模块连接，所述驱动信号切换模块与所述压电驱动和信号处理电路连接；
所述驱动信号切换模块用于控制自所述压电驱动和信号处理电路输出至各个压电骨导受话器驱动模块的压电驱动信号的相位，以使得各个所述压电骨导受话器驱动模块接收到的压电驱动信号为同相位或反相位。
优选地：
所述驱动信号切换模块为模拟开关。
所述压电骨导受话器驱动单元设有可独立驱动的第一压电骨导受话器驱动模块和第二压电骨导受话器驱动模块；第一压电骨导受话器驱动模块和第二压电骨导受话器驱动模块的正极信号输入端和负极信号输入端均与所述模拟开关连接，所述模拟开关通过切换使得第一压电骨导受话器驱动模块的正极信号输入端、负极信号输入端分别与第二压电骨导受话器驱动模块的正极信号输入端、负极信号输入端连接，或者第一压电骨导受话器驱动模块的正极信号输入端、负极信号输入端分别与第二压电骨导受话器驱动模块的负极信号输入端、正极信号输入端连接。
所述压电骨导受话器驱动模块包括表面涂敷有上电极层和下电极层的压电材料、电路板、以及将所述上电极层和下电极层与所述电路板连接的薄型或柔性电路。
所述压电骨导受话器驱动模块的压电材料为压电陶瓷材料或压电有机高分子材料。
所述压电材料为单层压电材料、双层复合结构压电材料或多层复合结构压电材料。
所述柔性电路为银导电胶、引线、 FPC 或柔性导电带，所述柔性电路的接触电阻小于 5 欧姆。
一种便携式电子设备，包括前述的任意一种压电骨导受话器。
优选所述压电骨导受话器驱动模块附着与便携式电子设备的屏幕或表层保护镜片上。
与现有技术相比，本发明的压电骨导受话器，通过控制两片压电骨导受话器驱动模块的压电驱动信号的相位，在嘈杂的环境中，二者的压电驱动信号同相位，此时可增大音量，除却部分振动借助人体的骨传导被用户感知，还有部分振动通过空气耦合传递经传统的二道空气声耦合被用户感知；而在安静环境下，可控制二者的压电驱动信号反相位，此时通话的声音主要通过振动的骨传导被用户感知，而空气耦合的部分由于振动源的反相位，大部分被抵消了，只有很小的一部中高频成分在设备附近小范围传递并按照 1/R 规律快速衰减，因此，能够有效地避免通话内容被周围的人听见，可实现良好的通话私密性。
附图说明
图 1 是本发明具体实施例的压电骨导受话器的电路框图；
图 2 为图 1 的压电骨导受话器驱动模块的结构示意图；
图 3 是本发明具体实施例的手机的结构示意图；
图 4 是图 3 的手机的正视图；
图 5 是图 4 的 A-A 剖视图；
图 6 是图 3 手机的压电骨导受话器的信号输入端子示意图；
图 7 是本发明具体实施例的信号切换模块的电路结构图。
具体实施方式
下面对照附图并结合优选的实施方式对本发明作进一步说明。
如图 1 所示，一种压电骨导受话器，包括：作为声振动元件的压电骨导受话器驱动单元、以及与所述压电骨导受话器驱动单元连接的压电驱动与信号处理电路，还包括驱动信号切换模块；
压电骨导受话器驱动单元至少包括两片可独立驱动的压电骨导受话器驱动模块，本实施例中，包括第一压电骨导受话器驱动模块 21 和第二骨导受话器驱动模块 22 ；
两个压电骨导受话器驱动模块分别与驱动信号切换模块连接，驱动信号切换模块与所述压电驱动和信号处理电路连接；
驱动信号切换模块用于控制自所述压电驱动和信号处理电路输出至各个压电骨导受话器驱动模块的压电驱动信号的相位，以使得各个所述压电骨导受话器驱动模块接收到的压电驱动信号为同相位或反相位。
如图 2 所示，第一压电骨导受话器驱动模块 21 和第二骨导受话器驱动模块 22 均包括下述结构：表面涂敷有上电极层和下电极层的压电材料 2C 、电路板 2A 、以及将所述上电极层和下电极层与所述电路板连接的薄型或柔性电路 2B ，其接触电阻优选小于 5 欧姆。压电材料 2C 可采用压电陶瓷材料（例如锆钛酸铅压电陶瓷，英文缩写 PZT ）或压电有机高分子材料（例如聚偏氟乙烯，英文缩写为 PVDF ）；压电材料的结构可采用单层结构、双层复合结构或多层复合结构，采用多层压电陶瓷可以极大的降低驱动电压，例如采用 5 层 20μm 的 PZT 压电陶瓷形成 0.1mm 厚的多层复合结构，其可采用 5V 有效值的驱动信号，该信号电压远低于人体安全电压，能够保证用户的安全；本实施例采用电路板 2A 上的铜箔电极 2B 连接压电材料 2C 和电路板 2A ，其连接方式如下：在 2B 上预涂上导电材料（如环氧类银导电胶 DC80B ）， 2A 与 2C 间通过热固型环氧树脂 Loctite3212 （该胶黏剂可以通过热风或烘道加热在极短时间内即可完成固化）粘接；由于环氧胶固化后特性与陶瓷以及电路板（ FR4 环氧板）近似，可以保证较好的振动耦合性和连接的可靠性。其中电路板 2A 的宽度尺寸为 1.2mm ，长 15mm 。
本实施例的骨导受话器可应用于手机、平板电脑、 MP3 等各种便携式电子设有，尤其是应用于具有通话功能的便携式电子设备，能有效保障用户通话的私密性。下文以手机为例对本发明进行进一步说明：
如图 3-5 所示，本实施例的压电骨导受话器的第一压电骨导受话器驱动模块 21 和第二骨导受话器驱动模块 22 对称设置在手机主体 3 的上方，附着于手机屏幕 1 （也可是表层保护玻璃）的下表面。压电骨导受话器的压电驱动与信号处理电路与手机主板连接，接收手机主板发送的音频信号，并将该音频信号转换为压电驱动信号通过驱动信号切换模块发送至两片骨导受话器驱动模块。
如图 6 所示，第一压电骨导受话器驱动模块 21 的压电信号输入端为正极 211 和负极 212 ， 第二压电骨导受话器驱动模块 22 的压电信号输入端为正极 221 和负极 222 ，当正极 211 和正极 221 连接，负极 212 和负极 222 连接，那么两片骨导受话器驱动模块即可实现同相位信号驱动；当正极 211 和负极 222 连接，负极 212 和证极 221 连接，那么两片骨导受话器驱动模块即可实现反相位信号驱动。利用信号切换模块进行切换即可实现两种模式的切换。
如图 7 所示，在优选的实施例中， 驱动信号切换模块可采用模拟开关，模拟开关的四个接线端子 L1 、 L2 、 L3 、 L4 分别与第一压电骨导受话器驱动模块的正极 211 、负极 212 、第二压电骨导受话器驱动模块的正极 221 、负极 222 连接，其中接线端子 L1 、 L2 还分别与压电驱动与信号处理电路 PA 的正、负输出连接；通过控制模拟开关的控制信号 C1 和 C2 即能够实现前述两种模式的切换，具体如下：
C1 C2 模拟开关输出
0 0 L1 与 L3 相通
L2 与 L4 相通
0 1 L1 与 L4 相通
L2 与 L3 相通
1 0
1 1
与现有技术相比，本发明的便携式电子设备，可通过软件或硬件控制实现标准模式和私密模式两种通话模式，标准模式下，两片骨导受话器驱动模块的驱动信号同相位，可提升在嘈杂环境下的音量，而在私密模式下，两片骨导受话器驱动模块的驱动信号反相位（幅度相同、相位相反），提升了在安静环境下的通话隐私保密性。
以上内容是结合具体的优选实施方式对本发明所作的进一步详细说明，不能认定本发明的具体实施只局限于这些说明。对于本发明所属技术领域的技术人员来说，在不脱离本发明构思的前提下，还可以做出若干等同替代或明显变型，而且性能或用途相同，都应当视为属于本发明的保护范围。

Claims (9)

  1. 一种压电骨导受话器，包括：作为声振动元件的压电骨导受话器驱动单元、以及与所述压电骨导受话器驱动单元连接的压电驱动与信号处理电路，其特征在于：
    还包括驱动信号切换模块；
    所述压电骨导受话器驱动单元至少包括两片可独立驱动的压电骨导受话器驱动模块；
    各个所述压电骨导受话器驱动模块分别与所述驱动信号切换模块连接，所述驱动信号切换模块与所述压电驱动和信号处理电路连接；
    所述驱动信号切换模块用于控制自所述压电驱动和信号处理电路输出至各个压电骨导受话器驱动模块的压电驱动信号的相位，以使得各个所述压电骨导受话器驱动模块接收到的压电驱动信号为同相位或反相位。
  2. 根据权利要求 1 所述的压电骨导受话器，其特征在于：所述驱动信号切换模块为模拟开关。
  3. 根据权利要求 2 所述的压电骨导受话器，其特征在于：所述压电骨导受话器驱动单元设有可独立驱动的第一压电骨导受话器驱动模块和第二压电骨导受话器驱动模块；第一压电骨导受话器驱动模块和第二压电骨导受话器驱动模块的正极信号输入端和负极信号输入端均与所述模拟开关连接，所述模拟开关通过切换使得第一压电骨导受话器驱动模块的正极信号输入端、负极信号输入端分别与第二压电骨导受话器驱动模块的正极信号输入端、负极信号输入端连接，或者第一压电骨导受话器驱动模块的正极信号输入端、负极信号输入端分别与第二压电骨导受话器驱动模块的负极信号输入端、正极信号输入端连接。
  4. 根据权利要求 1 、 2 或 3 所述的压电骨导受话器，其特征在于：所述压电骨导受话器驱动模块包括表面涂敷有上电极层和下电极层的压电材料、电路板、以及将所述上电极层和下电极层与所述电路板连接的薄型或柔性电路。
  5. 根据权利要求 4 所述的压电骨导受话器，其特征在于：所述压电骨导受话器驱动模块的压电材料为压电陶瓷材料或压电有机高分子材料。
  6. 根据权利要求 4 所述的压电骨导受话器，其特征在于：所述压电材料为单层压电材料、双层复合结构压电材料或多层复合结构压电材料。
  7. 根据权利要求 4 所述的压电骨导受话器，其特征在于：所述柔性电路为银导电胶、引线、 FPC 或柔性导电带，所述柔性电路的接触电阻小于 5 欧姆。
  8. 一种便携式电子设备，其特征在于，包括权利要求 1-7 任意一项所述的压电骨导受话器。
  9. 据权利要求 8 所述的便携式电子设备，其特征在于：所述压电骨导受话器驱动模块附着与便携式电子设备的屏幕或表层保护镜片上。
PCT/CN2014/079157 2013-08-01 2014-06-04 一种压电骨导受话器及一种便携式电子设备 WO2015014155A1 (zh)

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