WO2020248303A1 - 屏幕发声装置 - Google Patents

屏幕发声装置 Download PDF

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Publication number
WO2020248303A1
WO2020248303A1 PCT/CN2019/092838 CN2019092838W WO2020248303A1 WO 2020248303 A1 WO2020248303 A1 WO 2020248303A1 CN 2019092838 W CN2019092838 W CN 2019092838W WO 2020248303 A1 WO2020248303 A1 WO 2020248303A1
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WO
WIPO (PCT)
Prior art keywords
screen
frame
cover plate
electromagnet
magnetic
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/CN2019/092838
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English (en)
French (fr)
Inventor
陈召宪
毛路斌
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AAC Technologies Holdings Shenzhen Co Ltd
AAC Technologies Holdings Nanjing Co Ltd
Original Assignee
AAC Acoustic Technologies Shenzhen Co Ltd
AAC Technologies Holdings Nanjing Co Ltd
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 AAC Acoustic Technologies Shenzhen Co Ltd, AAC Technologies Holdings Nanjing Co Ltd filed Critical AAC Acoustic Technologies Shenzhen Co Ltd
Priority to US16/992,117 priority Critical patent/US11212602B2/en
Publication of WO2020248303A1 publication Critical patent/WO2020248303A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/02—Casings; Cabinets ; Supports therefor; Mountings therein
    • H04R1/023—Screens for loudspeakers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R11/00—Transducers of moving-armature or moving-core type
    • H04R11/02—Loudspeakers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; 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; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/02—Details
    • H04R9/04—Construction, mounting, or centering of coil
    • H04R9/046—Construction
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; 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; ELECTRIC HEARING AIDS; 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/04—Plane diaphragms

Definitions

  • the invention relates to the technical field of mobile terminal equipment, in particular to a screen sounding device.
  • the driving unit used for screen generation in mobile terminals of related technologies generally adopts piezoelectric or moving coil structure design, and is placed inside the complete machine of the mobile terminal.
  • the so-called integral device or distributed device is connected to the middle frame (or rear frame) of the mobile terminal.
  • the cover plate) and the screen of the mobile terminal are driven by piezoelectric or moving coil drive devices to vibrate and produce sound.
  • the piezoelectric drive device requires a relatively large voltage and consumes high energy, while the driving force of the moving coil drive device is very limited.
  • the object of the present invention is to provide a screen sound generating device that consumes less energy and can provide greater driving force.
  • a screen sounding device comprising a frame, a screen installed on the frame, and a driving device arranged between the frame and the screen to drive the screen to vibrate and emit sound.
  • the driving device includes a magnetic circuit system fixed on the screen and a fixed driving magnetic circuit system vibration
  • the magnetic circuit system includes a connecting cover plate fixed to the screen and a magnetic steel fixed to the side of the connecting cover plate away from the screen, and the magnetic steel is arranged around the electromagnet.
  • the electromagnet includes an iron core, a coil wound on the iron core, an upper magnetic conductive cover plate arranged on the side of the iron core close to the screen, and a lower magnetic conductive cover plate arranged on the side of the iron core away from the screen.
  • the magnetic conductive cover plate is fixed to the frame.
  • the multiple magnetic steels are evenly distributed around the electromagnet.
  • the magnetic steel is an integral ring member.
  • the magnet is magnetized along the vibration direction of the screen.
  • the magnetic circuit system also includes a magnetic steel magnetic plate connected to the side of the magnetic steel away from the screen.
  • the connecting cover plate is made of magnetically conductive materials.
  • the frame includes a middle frame and a back cover plate that covers the middle frame on the side opposite to the screen.
  • the screen and the back cover plate and the middle frame respectively form a first accommodating cavity and a second accommodating cavity, and the driving device is accommodated in Inside the first accommodating cavity, and the electromagnet is fixed to the middle frame.
  • the interaction of the magnetic circuit system and the electromagnet in the electromagnetic driving mode adopted by the screen sound device of the present invention can provide a larger driving force, but consumes little energy, thereby obtaining a better sound effect.
  • the present invention adopts the structure design of electromagnetically driving the screen to vibrate to produce sound, compared with the speakers and receivers used in the traditional technology, the present invention omits the structure of the traditional sounding device such as the diaphragm and the like, and the production cost is lower.
  • FIG. 1 is a schematic diagram of the first embodiment of the screen sound emitting device of the present invention
  • Figure 2 is an exploded view of Figure 1;
  • Figure 3 is a cross-sectional view in the direction of A-A in Figure 1;
  • Figure 4 is an enlarged view of B in Figure 3;
  • FIG. 5 is a schematic diagram of the driving device in the screen sound emitting device of the present invention.
  • Figure 6 is a cross-sectional view in the direction of C-C in Figure 5;
  • Figure 7 is an exploded view of Figure 5;
  • FIG. 8 is an exploded view of the driving device of the second embodiment of the screen sound emitting device of the present invention.
  • FIG. 9 is an exploded view of the driving device of the third embodiment of the screen sounding device of the present invention.
  • FIG. 10 is an exploded view of the driving device of the fourth embodiment of the screen sound emitting device of the present invention.
  • first and second are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined with “first” and “second” may explicitly or implicitly include one or more of these features. In the description of this application, “multiple” means two or more than two, unless otherwise specifically defined.
  • the screen sound device includes a frame 10, a screen 20 mounted on the frame 10, and a driving device 30 that is arranged between the frame 10 and the screen 20 to drive the screen 20 to vibrate and emit sound
  • the driving device 30 includes The magnetic circuit system 31 fixed to the screen 20 and the electromagnet 32 fixed to the frame 10 that drive the magnetic circuit system 31 to vibrate.
  • the magnetic circuit system 31 includes a connecting cover 311 fixed to the screen 20 and The magnetic steel 312 on the side of the cover plate 311 away from the screen 20, and the magnetic steel 312 is arranged around the electromagnet 32.
  • the screen sound device provided by the present invention adopts a structural design that electromagnetically drives the screen 20 to vibrate to produce sound. After the electromagnet 32 is energized, it interacts with the magnetic circuit system 31, and the magnetic circuit system 31 is driven to vibrate to drive the screen 20 to vibrate, thereby achieving sound .
  • the interaction of the magnetic circuit system 31 and the electromagnet 32 in the electromagnetic driving mode of the present invention can provide a larger driving force, but consumes little energy. In order to obtain a better sound effect.
  • the present invention adopts the structure design of electromagnetically driving the screen 20 to vibrate to produce sound, compared with the speakers and receivers used in the traditional technology, the present invention omits the structure such as the diaphragm of the traditional sounding device, and the production cost is lower.
  • the electromagnet 32 of the first embodiment includes an iron core 321, a coil 322 wound on the iron core 321, an upper magnetic cover plate 323 arranged on the side of the iron core 321 close to the screen 20, and an upper magnetic cover plate 323 arranged on the iron core 321.
  • the lower magnetic conductive cover 324 on the side away from the screen 20, the lower magnetic conductive cover 324 is fixed to the frame 10 (preferably, the lower magnetic conductive cover 324 is connected to the inner wall of the frame 10 by bonding and fixing), and the coil 322 After being energized, it cooperates with the iron core 321 to generate magnetic flux and has a strong magnetic effect.
  • the electromagnet 32 interacts with the magnetic circuit system 31 after being energized, and drives the magnetic circuit system 31 to vibrate to drive the screen 20 to vibrate, thereby realizing sound. Due to the small amplitude of the screen 20 during the sounding process, the design structure of the screen sounding device applying the present invention is applied to the corresponding mobile terminal, so that the corresponding components of the mobile terminal can be made very thin, and the assembled mobile terminal The size can be made smaller.
  • the iron core 321 can improve the effect of magnetic force, and the use of the upper magnetically conductive cover plate 323 and the lower magnetically conductive cover plate 324 is more conducive to the magnetic effect.
  • the electromagnet 32 of the present invention has a square structure, so four magnets 312 are used, that is, each magnet 312 corresponds to one side of the electromagnet 32.
  • each magnet 312 is magnetized along the vibration direction of the screen 20. In fact, if the screen 20 vibrates up and down in the vertical direction, the magnet 312 is magnetized along the vertical direction.
  • the connecting cover 311 is a ring-shaped plate with a hollow through hole corresponding to the electromagnet 32.
  • the connecting cover 311 is made of a magnetically conductive material. In this way, the connecting cover plate 311 can assist the magnetic permeability of the magnetic steel 312, thereby enhancing the magnetic permeability of the magnetic steel 312, enhancing the driving force output, and improving the sound effect.
  • the frame 10 in the first embodiment includes a middle frame 11 and a back cover plate 12 covering the side of the middle frame 11 opposite to the screen 20.
  • the screen 20 and the back cover plate 12 respectively form a first receiving cavity with the middle frame 11 101 and the second accommodating cavity 102, the driving device 30 is accommodated in the first accommodating cavity 101, and the electromagnet 32 is fixed to the middle frame 11.
  • the screen sounding device further includes a circuit main board 40 assembled in the second accommodating cavity 102 and electrically connected to the screen 20, and the circuit main board 40 is also electrically connected to the coil 322 of the electromagnet 32, wherein the magnetic circuit system 31 and the electromagnet 32 All are assembled in the first accommodating cavity 101.
  • the screen 20 includes a display screen 21 and a glass panel 22 which are arranged in a layered manner.
  • the display screen 21 is accommodated in the first accommodating cavity 101.
  • the display screen 21 is electrically connected to the circuit board 40 through a connecting cable.
  • the edge of the middle frame 11 is connected and fixed, and the display plane of the display screen 21 is attached to the glass panel 22.
  • FIG. 8 shows a schematic structural diagram of a screen sound emitting device according to a second embodiment of the present invention.
  • the structure of the screen sound device of the second embodiment has the following differences: the magnetic circuit system 31 also includes a side of the magnetic steel 312 far away from the screen 20 Magnetic steel permeable plate 313.
  • the magnetic steel permeable plate 313 and the connecting cover 311 can be made of the same magnetically permeable material. In the process of working and sounding, the magnetic steel permeable plate 313 can enhance the magnetic permeability, so as to obtain a stronger driving force to significantly improve Sound effect.
  • the rest of the structure of the screen sound emitting device of the second embodiment is the same as the corresponding structure of the first embodiment, and therefore will not be repeated here.
  • FIG. 9 shows a schematic structural diagram of a screen sounding device according to a third embodiment of the present invention.
  • the structure of the screen sounding device of the third embodiment has the following differences: the magnet 312 is an integral ring member, and the electromagnet 32 is inserted in the magnet 312 Through hole.
  • the rest of the structure of the screen sounding device of the third embodiment is the same as the corresponding structure of the first embodiment or the second embodiment, so it will not be repeated here.
  • FIG. 10 shows a schematic structural diagram of a screen sounding device according to a fourth embodiment of the present invention.
  • the structure of the screen sound device of the third embodiment has the following differences: the magnet 312 is an integral ring member, and the electromagnet 32 is inserted in the magnet 312 Through hole.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Electromagnetism (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)

Abstract

一种屏幕发声装置，包括框架（10）和安装于框架（10）上的屏幕（20）以及设置于框架（10）和屏幕（20）之间的驱动屏幕（20）振动发声的驱动装置（30），驱动装置（30）包括固定于屏幕（20）的磁路系统（31）和驱动磁路系统（31）振动的固定于框架（10）的电磁铁（32），磁路系统（31）包括固定于屏幕（20）的连接盖板（311）以及固定于连接盖板（311）远离屏幕（10）一侧的磁钢（312），磁钢（312）环绕电磁铁（32）设置。所述屏幕发声装置能够同时满足耗能少且提供较大的驱动力的要求。

Description

屏幕发声装置 技术领域
本发明涉及移动终端设备技术领域，尤其涉及一种屏幕发声装置。
 背景技术
相关技术的移动终端中用于屏幕发生的驱动单元一般采用压电式或动圈式结构设计，置于移动终端的整机内部，所谓整体器件或分布式器件连接移动终端的中框（或后盖板）和移动终端的屏幕，通过压电式或动圈式驱动器件对屏幕进行驱动而振动发声。但是，压电式驱动器件需要较大电压，耗能高，而动圈式驱动器件的驱动力是十分有限的。
因此，有必要在移动终端采用一种新型的驱动器件来驱动屏幕发声，同时满足耗能少且能够提供较大的驱动力这两个方面。
 技术问题
本发明的目的在于提供一种同时满足耗能少且能够提供较大的驱动力的屏幕发声装置。
 技术解决方案
本发明的技术方案如下：
一种屏幕发声装置，包括框架和安装于框架上的屏幕以及设置于框架和屏幕之间的驱动屏幕振动发声的驱动装置，驱动装置包括固定于屏幕的磁路系统和驱动磁路系统振动的固定于框架的电磁铁，磁路系统包括固定于屏幕的连接盖板以及固定于连接盖板远离屏幕一侧的磁钢，磁钢环绕电磁铁设置。
进一步地，电磁铁包括铁芯、缠绕在铁芯上的线圈、设置在铁芯的靠近屏幕一侧的上导磁盖板以及设置在铁芯的远离屏幕一侧的下导磁盖板，下导磁盖板固定于框架。
进一步地，磁钢为多个，多个磁钢环绕电磁铁均匀分布。
进一步地，磁钢为一体式环形构件。
进一步地，磁钢沿屏幕的振动方向充磁。
进一步地，磁路系统还包括连接在磁钢的远离屏幕一侧的磁钢导磁板。
进一步地，连接盖板采用导磁材料制造而成。
进一步地，框架包括中框以及盖合在中框的与屏幕相对一侧的后盖板，屏幕和后盖板分别与中框形成第一容置腔和第二容置腔，驱动装置收容于第一容置腔内，并且电磁铁固定于中框。
 有益效果
本发明的有益效果在于：
本发明的屏幕发声装置采用的电磁式驱动方式中的磁路系统与电磁铁相互作用能够提供较大的驱动力，而耗能却很少，从而获得更佳的发声效果。另外，由于本发明采用了电磁式驱动屏幕振动进行发声的结构设计，和传统技术中采用的扬声器、受话器相比，本发明省去了传统发声装置的振膜等结构，制作成本更低。
 附图说明
图1为本发明的屏幕发声装置的第一实施例示意图；
图2为图1的分解图；
图3为图1中A-A方向的剖视图；
图4为图3中B处的放大图；
图5为本发明的屏幕发声装置中的驱动装置的示意图；
图6为图5中C-C方向的剖视图；
图7为图5的分解图；
图8为本发明的屏幕发声装置的第二实施例的驱动装置的分解图；
图9为本发明的屏幕发声装置的第三实施例的驱动装置的分解图；
图10为本发明的屏幕发声装置的第四实施例的驱动装置的分解图。
 本发明的实施方式
为了使本发明的目的、技术方案及优点更加清楚明白，以下结合附图及实施例，对本发明进行进一步详细说明。应当理解，此处所描述的具体实施例仅仅用以解释本发明，并不用于限定本发明。
需要说明的是，当元件被称为“固定于”或“设置于”另一个元件，它可以直接在另一个元件上或者间接在该另一个元件上。当一个元件被称为是“连接于”另一个元件，它可以是直接连接到另一个元件或间接连接至该另一个元件上。
需要理解的是，术语“长度”、“宽度”、“上”、“下”、“前”、“后”、“左”、“右”、“竖直”、“水平”、“顶”、“底”、“内”、“外”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本申请和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本申请的限制。
此外，术语“第一”、“第二”仅用于描述目的，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括一个或者更多个该特征。在本申请的描述中，“多个”的含义是两个或两个以上，除非另有明确具体的限定。
下面结合附图和实施方式对本发明作进一步说明。
如图1至图7所示，其示出了本发明的第一实施例的屏幕发声装置的结构示意图。在第一实施例中，该屏幕发声装置包括框架10和安装于框架10上的屏幕20以及设置于框架10和屏幕20之间的驱动屏幕20振动发声的驱动装置30，其中，驱动装置30包括固定于屏幕20的磁路系统31和驱动磁路系统31振动的固定于框架10的电磁铁32，在本实施例中，磁路系统31包括固定于屏幕20的连接盖板311以及固定于连接盖板311的远离屏幕20一侧的磁钢312，并且磁钢312环绕电磁铁32设置。
本发明提供的屏幕发声装置采用了电磁式驱动屏幕20振动进行发声的结构设计，电磁铁32通电后与磁路系统31相互作用，驱动磁路系统31发生振动而带动屏幕20振动，从而实现发声。相比较于相关技术中采用压电式驱动装置的结构设计，本发明的电磁式驱动方式中的磁路系统31与电磁铁32相互作用能够提供较大的驱动力，而耗能却很少，从而获得更佳的发声效果。另外，由于本发明采用了电磁式驱动屏幕20振动进行发声的结构设计，和传统技术中采用的扬声器、受话器相比，本发明省去了传统发声装置的振膜等结构，制作成本更低。
具体地，第一实施例的电磁铁32包括铁芯321、缠绕在铁芯321上的线圈322、设置在铁芯321的靠近屏幕20一侧的上导磁盖板323以及设置在铁芯321的远离屏幕20一侧的下导磁盖板324，下导磁盖板324固定于框架10（优选地，下导磁盖板324采用粘接固定的方式连接于框架10的内壁），线圈322通电后与铁芯321配合产生磁通量具有较强的磁力作用效果。在工作过程中，电磁铁32通电后与磁路系统31相互作用，驱动磁路系统31发生振动而带动屏幕20振动，从而实现发声。由于发声过程中屏幕20振幅较小，故将应用本发明的屏幕发声装置的设计结构应用于相应的移动终端中，能够使得该移动终端的相应器件可以做得很薄，所组装得到的移动终端的尺寸可做得更小。在进行发声的工作过程中，铁芯321能够提高磁力作用效果，上导磁盖板323和下导磁盖板324的使用则更加有助于导磁作用。
在第一实施例中，如图7所示，磁钢312为多个，并且多个磁钢312环绕电磁铁均匀分布。具体地，本发明的电磁铁32为方形结构，因而磁钢312采用了四个，即每一个磁钢312对应电磁铁32的一个侧面。
如图3所示，每个磁钢312均沿着屏幕20的振动方向进行充磁，实际上，屏幕20在竖直方向上下振动，则磁钢312沿着竖直方向进行充磁。
在第一实施例中，为了减少连接盖板311的使用物料，因此，连接盖板311为具有与电磁铁32相对应的中空通孔的环形板。并且，连接盖板311采用导磁材料制造而成。这样，连接盖板311就能够对磁钢312的导磁作用进行辅助，从而增强磁钢312的导磁作用，增强驱动力输出，提升发声效果。
第一实施例中的框架10包括中框11以及盖合在中框11的与屏幕20相对一侧的后盖板12，屏幕20和后盖板12分别与中框11形成第一容置腔101和第二容置腔102，驱动装置30收容于第一容置腔101内，并且电磁铁32固定于中框11。屏幕发声装置还包括装配于第二容置腔102内且与屏幕20电连接的电路主板40，并且电路主板40还与电磁铁32的线圈322电连接，其中，磁路系统31和电磁铁32均装配于第一容置腔101内。其中，屏幕20包括层叠设置的显示屏21和玻璃面板22，显示屏21容纳在第一容置腔101内，显示屏21通过连接排线与电路主板40电连接，玻璃面板22的边缘则对应与中框11的边缘连接固定，并且显示屏21的显示平面则贴附在玻璃面板22上。
如图8所示，其示出了本发明的第二实施例的屏幕发声装置的结构示意图。与第一实施例的屏幕发声装置的结构相比较而言，第二实施例的屏幕发声装置的结构具有以下不同之处：磁路系统31还包括连接在磁钢312的远离屏幕20一侧的磁钢导磁板313。磁钢导磁板313与连接盖板311可采用相同的导磁材料制造而成，在工作发声过程中，磁钢导磁板313能够增强导磁作用，从而获得更强的驱动力以显著提高发声效果。
第二实施例的屏幕发声装置的其余结构均与第一实施例的相应结构相同，因而在此不再赘述。
如图9所示，其示出了本发明的第三实施例的屏幕发声装置的结构示意图。与第一实施例的屏幕发声装置的结构相比较而言，第三实施例的屏幕发声装置的结构具有以下不同之处：磁钢312为一体式环形构件，电磁铁32插入位于磁钢312的通孔中。
第三实施例的屏幕发声装置的其余结构均与第一实施例或第二实施例的相应结构相同，因而在此不再赘述。
如图10所示，其示出了本发明的第四实施例的屏幕发声装置的结构示意图。与第二实施例的屏幕发声装置的结构相比较而言，第三实施例的屏幕发声装置的结构具有以下不同之处：磁钢312为一体式环形构件，电磁铁32插入位于磁钢312的通孔中。
第四实施例的屏幕发声装置的其余结构均与第二实施例的相应结构相同，因而在此不再赘述。
以上所述的仅是本发明的实施方式，在此应当指出，对于本领域的普通技术人员来说，在不脱离本发明创造构思的前提下，还可以做出改进，但这些均属于本发明的保护范围。

Claims (8)

  1. 屏幕发声装置，包括框架和安装于所述框架上的屏幕以及设置于所述框架和所述屏幕之间的驱动所述屏幕振动发声的驱动装置，其特征在于，所述驱动装置包括固定于所述屏幕的磁路系统和驱动所述磁路系统振动的固定于所述框架的电磁铁，所述磁路系统包括固定于所述屏幕的连接盖板以及固定于所述连接盖板远离所述屏幕一侧的磁钢，所述磁钢环绕所述电磁铁设置。
  2. 根据权利要求1所述的屏幕发声装置，其特征在于：所述电磁铁包括铁芯、缠绕在所述铁芯上的线圈、设置在所述铁芯的靠近所述屏幕一侧的上导磁盖板以及设置在所述铁芯的远离所述屏幕一侧的下导磁盖板，所述下导磁盖板固定于所述框架。
  3. 根据权利要求1所述的屏幕发声装置，其特征在于：所述磁钢为多个，多个所述磁钢环绕所述电磁铁均匀分布。
  4. 根据权利要求1所述的屏幕发声装置，其特征在于：所述磁钢为一体式环形构件。
  5. 根据权利要求1所述的屏幕发声装置，其特征在于：所述磁钢沿所述屏幕的振动方向充磁。
  6. 根据权利要求1所述的屏幕发声装置，其特征在于：所述磁路系统还包括连接在所述磁钢的远离所述屏幕一侧的磁钢导磁板。
  7. 根据权利要求1所述的屏幕发声装置，其特征在于：所述连接盖板采用导磁材料制造而成。
  8. 根据权利要求1所述的屏幕发声装置，其特征在于：所述框架包括中框以及盖合在所述中框的与所述屏幕相对一侧的后盖板，所述屏幕和所述后盖板分别与所述中框形成第一容置腔和第二容置腔，所述驱动装置收容于所述第一容置腔内，并且所述电磁铁固定于所述中框。
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