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WO2016184080A1 - 一种电声转换装置 - Google Patents

一种电声转换装置 Download PDF

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Publication number
WO2016184080A1
WO2016184080A1 PCT/CN2015/096865 CN2015096865W WO2016184080A1 WO 2016184080 A1 WO2016184080 A1 WO 2016184080A1 CN 2015096865 W CN2015096865 W CN 2015096865W WO 2016184080 A1 WO2016184080 A1 WO 2016184080A1
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WO
WIPO (PCT)
Prior art keywords
frequency dividing
dividing circuit
diaphragm
voice coil
piezoelectric
Prior art date
Application number
PCT/CN2015/096865
Other languages
English (en)
French (fr)
Inventor
单连文
杨鑫峰
王海荣
崔龙浩
Original Assignee
歌尔声学股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 歌尔声学股份有限公司 filed Critical 歌尔声学股份有限公司
Priority to US15/552,707 priority Critical patent/US10219080B2/en
Publication of WO2016184080A1 publication Critical patent/WO2016184080A1/zh

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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
    • H04R23/00—Transducers other than those covered by groups H04R9/00 - H04R21/00
    • H04R23/02—Transducers using more than one principle simultaneously
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R19/00—Electrostatic transducers
    • H04R19/02—Loudspeakers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R31/00—Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor
    • H04R31/003—Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor for diaphragms or their outer suspension
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/02—Details
    • H04R9/025—Magnetic circuit
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/06—Loudspeakers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2209/00—Details of transducers of the moving-coil, moving-strip, or moving-wire type covered by H04R9/00 but not provided for in any of its subgroups
    • H04R2209/024—Manufacturing aspects of the magnetic circuit of loudspeaker or microphone transducers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2400/00—Loudspeakers
    • H04R2400/11—Aspects regarding the frame of loudspeaker transducers

Definitions

  • the present invention relates to an electroacoustic conversion device.
  • a conventional moving coil receiver (Receiver) and a speaker (Speaker) are hereinafter collectively referred to as a moving coil type electroacoustic transducer. Regardless of whether it is applied to a mobile phone or a headset, the high-frequency frequency response curve of the receiver will drop rapidly at 6k-9kHz, and the high-frequency frequency response curve of the speaker will also drop rapidly after a dozen KHz, which is also said. High frequency cutoff frequency. Due to the limitations of the materials and processes of the moving coil electroacoustic converter, the high frequency cutoff frequency is difficult to increase.
  • the present invention provides an electroacoustic conversion device comprising: a vibration system and a magnetic circuit system having a magnetic gap; the vibration system comprising: a diaphragm coupled to the diaphragm and suspended in the magnetic gap a voice coil, a piezoelectric sheet coupled to one side of the diaphragm, a first frequency dividing circuit coupled to the voice coil, and a second frequency dividing circuit coupled to the piezoelectric sheet; the first frequency dividing circuit The circuit divides the externally input first audio signal and outputs the low frequency signal to the voice coil; the second frequency dividing circuit divides the externally input second audio signal into a high frequency signal to drive the piezoelectric sheet.
  • the first frequency dividing circuit is a low pass filter
  • the second frequency dividing circuit is a high pass filter
  • the diaphragm includes a centrally located planar portion and a folded portion at an edge of the planar portion, and the piezoelectric sheet is disposed at a position of a planar portion of the diaphragm.
  • the vibration system further includes a centering piece fixed to the voice coil, the centering piece includes a first conductive line and a second conductive line formed on a surface thereof, and the first input audio of the external input The signal is input to the first frequency dividing circuit via the first conductive line, and the externally input second channel audio signal is input to the second frequency dividing circuit via the second conductive line.
  • the first frequency dividing circuit and the second frequency dividing circuit are disposed on a surface of the centering piece.
  • the first frequency dividing circuit is disposed on a surface of the centering piece, and the second frequency dividing circuit is disposed on a surface of the piezoelectric piece.
  • the vibration system is arranged in any one of the following: a piezoelectric sheet, a centering piece, a diaphragm, a voice coil from top to bottom; or a diaphragm or a piezoelectric piece from top to bottom. , centering piece, voice coil; or, from top to bottom, the piezoelectric piece, the diaphragm, the centering piece, the voice coil.
  • the centering piece is provided on the upper surface thereof with two second pads electrically connected to the piezoelectric piece and on the lower surface thereof, two first weldings electrically connected to the voice coil are provided plate.
  • the center of the diaphragm is provided with an opening
  • the centering piece includes a central portion, an outer ring, and a connecting portion connecting the central portion and the outer ring, the first pad and the second pad It is disposed at a central portion of the centering piece.
  • the inventors of the present invention have found that there is no ultra-wideband electroacoustic conversion device in combination with a moving coil type sounding structure in the prior art. Therefore, the technical task to be achieved by the present invention or the technical problem to be solved is not thought of or expected by those skilled in the art, so the present invention is a new technical solution.
  • the electroacoustic conversion device of the invention has both a moving coil type sounding structure and a piezoelectric type sounding structure, and is provided with two frequency dividing circuits, and the piezoelectric sheet has a high frequency signal input to drive the diaphragm to vibrate and sound, and the voice coil has When the low frequency signal is input, the diaphragm vibrates and sounds under the action of the magnetic field, thereby realizing a super-wideband electroacoustic conversion device with good performance.
  • Figure 1 is a schematic view showing the structure of an electroacoustic transducer of the present invention.
  • Figure 2 is a schematic view showing the structure of the centering piece of the present invention.
  • FIG 3 is a schematic view showing the structure of the first conductive line and the first frequency dividing circuit disposed on the lower surface of the centering piece according to the present invention.
  • FIG. 4 is a schematic view showing the structure of the second conductive line and the second frequency dividing circuit disposed on the upper surface of the centering piece of the present invention.
  • Fig. 5 is a structural schematic view showing the arrangement of a second frequency dividing circuit on a piezoelectric sheet of the present invention.
  • the electroacoustic conversion device of the present invention includes a vibration system, a magnetic circuit system, and an outer casing that houses the fixed vibration system and the magnetic circuit system.
  • the magnetic circuit system includes a washer and a magnet fixed in order from top to bottom.
  • the magnet may include a central magnet and an edge magnet.
  • the washer may include a center washer and a side washer, and a gap between the center magnet and the side magnet is a magnetic gap.
  • the vibration system includes a diaphragm, a voice coil coupled under the diaphragm and suspended in the magnetic gap, and a piezoelectric sheet coupled to one side of the diaphragm.
  • the method further includes a first frequency dividing circuit connected to the voice coil and a second frequency dividing circuit connected to the piezoelectric sheet.
  • the frequency dividing frequency is used to separate the high frequency component and the low frequency component of the signal, and the first frequency dividing circuit inputs the external component.
  • the first audio signal is divided into a low frequency signal and output to the voice coil, and the second frequency dividing circuit divides the externally input second audio signal into a high frequency signal to drive the piezoelectric sheet.
  • the source of the two audio signals is the same, but the power of the second audio signal through the power amplifier circuit will be relatively large.
  • the first frequency dividing circuit may be, for example, a low pass filter
  • the second frequency dividing circuit may be, for example, a high pass filter.
  • the high-frequency cutoff frequency of the piezoelectric sounding device can reach 16 kHz or more.
  • the piezoelectric sheet has a high-frequency signal input to drive the diaphragm to vibrate, and the voice coil has a low-frequency signal when inputting the magnetic field.
  • the diaphragm is vibrated and audible, thereby realizing an ultra-wideband electroacoustic conversion device.
  • the piezoelectric sheet can be disposed at the center of the diaphragm, so that the piezoelectric sheet can function as a diaphragm reinforcing portion or a DOME.
  • the diaphragm can include a centrally located flat portion and a folded ring at the edge of the flat portion. The piezoelectric sheet is placed at a position of a plane portion of the diaphragm.
  • an embodiment of the electroacoustic conversion device of the present invention includes, in order from top to bottom, a front cover 1, a piezoelectric piece 2, a centering piece 3, a diaphragm 4, a voice coil 5, and a frame. Body and magnetic circuit system 6.
  • the magnetic circuit system has a magnetic gap
  • the front cover 1 and the frame constitute an outer casing for housing the fixed vibration system and the magnetic circuit system, and the magnetic circuit system and the frame are schematically integrated in FIG.
  • the piezoelectric sheet 2, the centering piece 3, the diaphragm 4, and the voice coil 5 constitute a vibration system.
  • the diaphragm includes a planar portion at the center, a folded portion at the edge of the flat portion, and a fixed portion fixed to the outer casing at the outermost periphery; the piezoelectric sheet 2 is disposed at a plane portion of the diaphragm
  • the flat portion of the diaphragm is cut to form a through opening at a position corresponding to the piezoelectric piece, and the piezoelectric piece covers the opening and is combined with the diaphragm, so that the piezoelectric piece can be used as a diaphragm reinforcement or DOME
  • Figure 1 is an exploded view showing the magnetic coil suspended in the magnetic circuit system after assembly. In the gap.
  • the centering piece 3 includes an outer ring 302 and a central portion 301 at the center, and the center portion 301 and the outer ring 302 are passed through four cantilevers 303 (connecting portions). connect them.
  • the lower surface of the centering piece 3 is provided, and a first conductive line (not shown), a first-order low-pass filter 100 composed of an inductor and a load resistor, and an outer ring side are disposed on the lower surface.
  • Two pads 31 of the corner are located at the two first pads 32 of the central portion.
  • the first conductive line is electrically connected to the external circuit through the pad 31 to access the first audio signal, and the low frequency signal is filtered out through the first-order low-pass filter 100, and the low frequency signal is output to the voice coil 5 through the first pad 32.
  • the upper surface of the centering piece 3 is provided, and a second conductive line (not shown), a first-order high-pass filter 200 composed of a capacitor and a load resistor, and an outer ring are provided on the upper surface.
  • Two pads 33 of the two corners are located at the two second pads 34 at the center.
  • the second conductive line is electrically connected to the external circuit through the pad 33 to access the second audio signal, and the high frequency signal is filtered out through the first-order high-pass filter 200, and the high frequency signal is output to the piezoelectric piece through the second pad 34.
  • the second frequency dividing circuit may also be disposed on the piezoelectric sheet 2.
  • a first-order high-pass filter 200 composed of a capacitor and a load resistor is disposed on the piezoelectric sheet 2.
  • the second conductive line on the centering piece 3 is electrically connected to the external circuit through the pad 33 to access the second audio signal, and then the second audio signal is output to the first-order high-pass filter 200 through the pad 34 for filtering and taking out.
  • the arrangement of the vibration system is a piezoelectric sheet, a centering piece, a diaphragm, and a voice coil in order from top to bottom.
  • the arrangement of the vibration system is a diaphragm, a piezoelectric piece, a centering piece, and a voice coil in order from top to bottom.
  • the arrangement of the vibrating system is a piezoelectric sheet, a diaphragm, a centering piece, and a voice coil from top to bottom.
  • the centering pieces are located between the piezoelectric piece and the voice coil, and the centering piece can be used to set the conductive line and the frequency dividing circuit, and since the center of the diaphragm is provided with an opening, it can be determined
  • the upper surface of the central portion of the core piece is provided with a second pad connected to the piezoelectric piece, and the lower surface of the central portion is provided with a first pad connected to the voice coil.
  • Such a connection method has no obstruction, and the connection line is short and easy to realize. .
  • the electroacoustic conversion device of the invention has both a moving coil type sounding structure and a piezoelectric type sounding
  • the structure is provided with two frequency dividing circuits.
  • the piezoelectric chip has a high frequency signal input, the diaphragm vibrates and sounds.
  • the voice coil has a low frequency signal, the diaphragm vibrates and sounds under the action of the magnetic field, thereby realizing a kind of sound.
  • An ultra-wideband electroacoustic transducer with good performance.
  • the present invention can provide a conductive line and a frequency dividing circuit by using a centering piece, and the wiring is ingenious and easy to implement.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Manufacturing & Machinery (AREA)
  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Circuit For Audible Band Transducer (AREA)
  • Piezo-Electric Transducers For Audible Bands (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)

Abstract

一种电声转换装置，包括：振动系统和具有磁间隙的磁路系统；振动系统包括：振膜（4）、结合于振膜（4）下方并且悬置于磁间隙中的音圈（5）、结合于振膜（4）一侧的压电片（2）、与音圈（5）连接的第一分频电路，以及与压电片（2）连接的第二分频电路；第一分频电路将外部输入的第一路音频信号分频出低频信号输出至音圈（5）；第二分频电路将外部输入的第二路音频信号分频出高频信号以驱动压电片（2）。由于同时具有动圈式的发声结构和压电式的发声结构，并设置有两个分频电路，压电片有高频信号输入时带动振膜振动发声，音圈有低频信号输入时在磁场的作用下带动振膜振动发声，从而实现了一种性能良好的超宽频带的电声转换装置。

Description

一种电声转换装置 技术领域
本发明涉及一种电声转换装置。
背景技术
普通动圈式的受话器(Receiver)和扬声器(Speaker)，以下统称为动圈式电声转换装置。不管是将其应用于手机或者耳机，受话器的高频频率响应曲线在6k-9kHz就会出现快速下跌，扬声器的高频频率响应曲线在十几KHz之后也会出现快速下跌，这也就是所说的高频截止频率。由于动圈式电声转换装置的材料和工艺的限制，高频截止频率很难提升。
随着4G通讯的应用，要求超宽频带(super wideband)的电声转换装置，需要高频截止频率能够达到16kHz及以上，而现有的这种动圈式电声转换装置已经很难达到要求。
发明内容
本发明的目的是提供一种超宽频带的电声装换装置的新技术方案。
本发明提供了一种电声转换装置，包括：振动系统和具有磁间隙的磁路系统；所述振动系统包括：振膜、结合于所述振膜下方并且悬置于所述磁间隙中的音圈、结合于所述振膜一侧的压电片、与所述音圈连接的第一分频电路、以及与所述压电片连接的第二分频电路；所述第一分频电路将外部输入的第一路音频信号分频出低频信号输出至所述音圈；所述第二分频电路将外部输入的第二路音频信号分频出高频信号以驱动所述压电片。
优选的，所述第一分频电路为低通滤波器，所述第二分频电路为高通滤波器。
优选的，所述振膜包括位于中心的平面部和位于所述平面部边缘的折环部，所述压电片设置于所述振膜的平面部的位置。
优选的，所述振动系统还包括与所述音圈固定的定心支片，所述定心支片包括形成于其表面的第一导电线路和第二导电线路，外部输入的第一路音频信号经所述第一导电线路输入至所述第一分频电路，外部输入的第二路音频信号经所述第二导电线路输入至所述第二分频电路。
优选的，所述第一分频电路和所述第二分频电路设置于所述定心支片的表面。
优选的，所述第一分频电路设置于所述定心支片的表面，所述第二分频电路设置于所述压电片的表面。
优选的，所述振动系统的排列方式为下列任一：从上至下依次为压电片、定心支片、振膜、音圈；或者，从上至下依次为振膜、压电片、定心支片、音圈；或者，从上至下依次为压电片、振膜、定心支片、音圈。
优选的，所述定心支片在其上表面设有两个与所述压电片电连接的第二焊盘并且在其下表面设有两个与所述音圈电连接的第一焊盘。
优选的，所述振膜的中心设有开口，所述定心支片包括中心部、外环，以及连接所述中心部和外环的连接部，所述第一焊盘和第二焊盘设置于所述定心支片的中心部。
本发明的发明人发现，在现有技术中还没有与动圈式发声结构结合的超宽频带的电声转换装置。因此，本发明所要实现的技术任务或者所要解决的技术问题是本领域技术人员从未想到的或者没有预期到的，故本发明是一种新的技术方案。
本发明的电声转换装置同时具有动圈式的发声结构和压电式的发声结构，并且设置有两个分频电路，压电片有高频信号输入时带动振膜振动发声，音圈有低频信号时输入时在磁场的作用下带动振膜振动发声，从而实现了一种性能良好的超宽频带的电声转换装置。
通过以下参照附图对本发明的示例性实施例的详细描述，本发明的其它特征及其优点将会变得清楚。
附图说明
被结合在说明书中并构成说明书的一部分的附图示出了本发明的实 施例，并且连同其说明一起用于解释本发明的原理。
图1是本发明电声转换装置的结构示意图。
图2是本发明定心支片的结构示意图。
图3是本发明在定心支片的下表面设置第一导电线路和第一分频电路的结构示意图。
图4是本发明在定心支片的上表面设置第二导电线路和第二分频电路的结构示意图。
图5是本发明在压电片上设置第二分频电路的结构示意图。
附图标记说明
1前盖、2压电片、3定心支片、4振膜、5音圈、6框体和磁路系统、301中心部、302外环，303悬臂、100低通滤波器、200高通滤波器、31焊盘、33焊盘，32第一焊盘、34第二焊盘。
具体实施方式
现在将参照附图来详细描述本发明的各种示例性实施例。应注意到：除非另外具体说明，否则在这些实施例中阐述的部件和步骤的相对布置、数字表达式和数值不限制本发明的范围。
以下对至少一个示例性实施例的描述实际上仅仅是说明性的，决不作为对本发明及其应用或使用的任何限制。
对于相关领域普通技术人员已知的技术、方法和设备可能不作详细讨论，但在适当情况下，技术、方法和设备应当被视为说明书的一部分。
在这里示出和讨论的所有例子中，任何具体值应被解释为仅仅是示例性的，而不是作为限制。因此，示例性实施例的其它例子可以具有不同的值。
应注意到：相似的标号和字母在下面的附图中表示类似项，因此，一旦某一项在一个附图中被定义，则在随后的附图中不需要对其进行进一步讨论。
本发明的电声转换装置包括振动系统、磁路系统、以及收容固定振动系统和磁路系统的外壳。磁路系统包括从上至下依次固定的华司、磁铁、 盆架等，磁铁可以包括中心磁铁和边磁铁，与之对应的，华司可以包括中心华司和边华司，中心磁铁和边磁铁之间的间隙即为磁间隙。当然，磁路系统的结构和磁间隙的设置也可以以其它方式实现，本领域技术人员可以根据现有技术和应用环境的需要进行设计。振动系统包括振膜、结合于振膜下方并且悬置于磁间隙中的音圈、结合于振膜一侧的压电片。
还包括与音圈连接的第一分频电路以及与压电片连接的第二分频电路，分频的目的是将信号的高频成分和低频成分分开，第一分频电路将外部输入的第一路音频信号分频出低频信号输出至音圈，第二分频电路将外部输入的第二路音频信号分频出高频信号以驱动压电片。两路音频信号的来源相同，但是第二路音频信号经过了功放电路功率会比较大。其中，第一分频电路可以例如为低通滤波器，第二分频电路可以例如为高通滤波器。
通过上述结构，实现了动圈式发声装置和压电式发声装置的结合。压电式发声装置的高频截止频率可以达到16kHz及以上，通过设置上述分频电路，压电片有高频信号输入时带动振膜振动发声，音圈有低频信号时输入时在磁场的作用下带动振膜振动发声，从而实现了一种超宽频带的电声转换装置。
另外，可以将压电片设置于振膜的中心位置，这样压电片能够起到振膜补强部或者DOME的作用，例如振膜可以包括位于中心的平面部和位于平面部边缘的折环部，将压电片设置于振膜的平面部的位置。
参考图1-4所示为本发明电声转换装置的一个实施例，从上至下依次包括：前盖1、压电片2、定心支片3、振膜4、音圈5、框体和磁路系统6。
磁路系统具有磁间隙，前盖1和框体组成收容固定振动系统和磁路系统的外壳，磁路系统和框体示意性的一体绘制于图1中。
压电片2、定心支片3、振膜4、音圈5组成振动系统。从图1中可以看出，振膜包括位于中心的平面部、位于平面部边缘的折环部、以及位于最外围的与外壳固定的固定部；压电片2设置于振膜的平面部的上方，振膜的平面部在对应压电片的位置去料形成贯通的开口，压电片覆盖该开口并且与振膜结合在一起，这样设置后压电片能够起到振膜补强或者DOME的作用。图1为分解示意图，在组装好以后，音圈会悬置在磁路系统的磁 间隙中。
参考图2所示为定心支片3的示意性结构，定心支片3包括外环302和位于中心的中心部301，通过4条悬臂303(连接部)将中心部301和外环302连接起来。
参考图3所示为定心支片3的下表面，在下表面设有第一导电线路(图中没有示出)、由电感和负载电阻组成的一阶低通滤波器100、位于外环边角的两个焊盘31，位于中心部的两个第一焊盘32。第一导电线路通过焊盘31与外部电路电连接以接入第一路音频信号，经由一阶低通滤波器100滤波取出低频信号，该低频信号通过第一焊盘32输出至音圈5。
参考图4所示为定心支片3的上表面，在上表面设有第二导电线路(图中没有示出)、由电容和负载电阻组成的一阶高通滤波器200、位于外环另外两个边角的两个焊盘33，位于中心部的两个第二焊盘34。第二导电线路通过焊盘33与外部电路电连接以接入第二路音频信号，经由一阶高通滤波器200滤波取出高频信号，该高频信号通过第二焊盘34输出至压电片2。
在另一个实施例中，第二分频电路还可以设置在压电片2上。参考图5所示，由电容和负载电阻组成的一阶高通滤波器200设置在压电片2上。定心支片3上的第二导电线路通过焊盘33与外部电路电连接以接入第二路音频信号，然后将第二路音频信号通过焊盘34输出至一阶高通滤波器200滤波取出高频信号，由该高频信号驱动压电片振动。
以上实施例中，振动系统的排列方式从上至下依次为压电片、定心支片、振膜、音圈。或者，振动系统的排列方式从上至下依次为振膜、压电片、定心支片、音圈。或者，振动系统的排列方式从上至下依次为压电片、振膜、定心支片、音圈。在这几种排列方式中，定心支片都位于压电片和音圈之间，可以利用定心支片设置导电线路以及分频电路，又由于振膜的中心设有开口，所以可以在定心支片的中心部的上表面设置与压电片连接的第二焊盘，中心部的下表面设置与音圈连接的第一焊盘，这样的连接方式没有阻碍物，连接线路短容易实现。
本发明的电声转换装置同时具有动圈式的发声结构和压电式的发声 结构，并且设置有两个分频电路，压电片有高频信号输入时带动振膜振动发声，音圈有低频信号时输入时在磁场的作用下带动振膜振动发声，从而实现了一种性能良好的超宽频带的电声转换装置。同时，本发明可以利用定心支片设置导电线路和分频电路，布线巧妙并且容易实现。
虽然已经通过例子对本发明的一些特定实施例进行了详细说明，但是本领域的技术人员应该理解，以上例子仅是为了进行说明，而不是为了限制本发明的范围。本领域的技术人员应该理解，可在不脱离本发明的范围和精神的情况下，对以上实施例进行修改。本发明的范围由所附权利要求来限定。

Claims (9)

  1. 一种电声转换装置，其特征在于，包括：
    振动系统和具有磁间隙的磁路系统；
    所述振动系统包括：振膜(4)、结合于所述振膜(4)下方并且悬置于所述磁间隙中的音圈(5)、结合于所述振膜(4)一侧的压电片(2)、与所述音圈(5)连接的第一分频电路、以及与所述压电片(2)连接的第二分频电路；
    所述第一分频电路将外部输入的第一路音频信号分频出低频信号输出至所述音圈(5)；所述第二分频电路将外部输入的第二路音频信号分频出高频信号以驱动所述压电片(2)。
  2. 根据权利要求1所述的装置，其特征在于，所述第一分频电路为低通滤波器(100)，所述第二分频电路为高通滤波器(200)。
  3. 根据权利要求1所述的装置，其特征在于，所述振膜(4)包括位于中心的平面部和位于所述平面部边缘的折环部，所述压电片(2)设置于所述振膜(4)的平面部的位置。
  4. 根据权利要求1所述的装置，其特征在于，所述振动系统还包括与所述音圈(5)固定的定心支片(3)，所述定心支片(3)包括形成于其表面的第一导电线路和第二导电线路，外部输入的第一路音频信号经所述第一导电线路输入至所述第一分频电路，外部输入的第二路音频信号经所述第二导电线路输入至所述第二分频电路。
  5. 根据权利要求4所述的装置，其特征在于，所述第一分频电路和所述第二分频电路设置于所述定心支片(3)的表面。
  6. 根据权利要求4所述的装置，其特征在于，所述第一分频电路设置于所述定心支片(3)的表面，所述第二分频电路设置于所述压电片(2)的表面。
  7. 根据权利要求4-6任一项所述的装置，其特征在于，所述振动系统的排列方式为下列任一：从上至下依次为压电片(2)、定心支片(3)、振膜(4)、音圈(5)；或者，从上至下依次为振膜(4)、压电片(2)、 定心支片(3)、音圈(5)；或者，从上至下依次为压电片(2)、振膜(4)、定心支片(3)、音圈(5)。
  8. 根据权利要求7所述的装置，其特征在于，所述定心支片(3)在其上表面设有两个与所述压电片(2)电连接的第二焊盘(34)并且在其下表面设有两个与所述音圈(5)电连接的第一焊盘(32)。
  9. 根据权利要求8所述的装置，其特征在于，所述振膜(4)的中心设有开口，所述定心支片(3)包括中心部(301)、外环(302)，以及连接所述中心部(301)和外环(302)的连接部(302)，所述第一焊盘(32)和第二焊盘(34)设置于所述定心支片的中心部。
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