WO2018170946A1 - 动磁式扬声器 - Google Patents
动磁式扬声器 Download PDFInfo
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- WO2018170946A1 WO2018170946A1 PCT/CN2017/078759 CN2017078759W WO2018170946A1 WO 2018170946 A1 WO2018170946 A1 WO 2018170946A1 CN 2017078759 W CN2017078759 W CN 2017078759W WO 2018170946 A1 WO2018170946 A1 WO 2018170946A1
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- the utility model relates to the technical field of electroacoustic products, in particular to a moving magnetic speaker.
- Speakers are important acoustic components of portable electronic devices that are used to convert electrical and acoustic signals and are an energy conversion device.
- the speakers used in portable electronic devices are mostly moving coil speakers.
- the working principle of the moving coil speaker is that the energized voice coil is subjected to the ampere force in the magnetic field, and the diaphragm vibrates and sounds. Due to the principle of the problem, the moving coil The speaker is difficult to improve in high-frequency transient response, and the high-frequency performance is low, which cannot meet the performance requirements of current Hi-Fi (high-fidelity) equipment.
- the technical problem to be solved by the present invention is to provide a moving magnetic speaker, which has good high-frequency transient response, low F0 (resonant frequency), and high overall performance.
- the technical solution of the present invention is:
- a moving magnetic speaker including a housing in which a diaphragm and a voice coil disposed under the diaphragm in parallel with the diaphragm are disposed, the diaphragm including an edge portion fixed to the case a folding ring on the body, a vibration plate is disposed in a middle portion of the folding ring, a driving magnet is fixed on a side of the vibration plate near the voice coil, and an armature is disposed in a center hole of the voice coil, and the armature and the armature
- the driving magnet is oppositely disposed and spaced apart from the driving magnet, and the voice coil is energized to form an electromagnet, and an interaction force with the driving magnet drives the diaphragm to vibrate.
- the voice coil is covered with a magnetic conductive member, and the magnetic conductive member is provided with a relief hole corresponding to a position of the central hole of the voice coil.
- the folding ring is connected by two folding rings with opposite bending directions, and a folding ring adjacent to the vibration plate is convex upward and has a curvature greater than that of the other folding ring.
- the casing is an annular structure with open ends, a lower frame end of the casing is coupled with a basin frame, and the voice coil and the armature are fixed on the basin frame; the edge portion of the folding ring It is fixed to the upper end surface of the housing.
- the inner side wall of the casing is provided with a positioning boss extending toward the center of the casing, and a lower surface of the positioning boss is in contact with the upper surface of the magnetic conductive component.
- the voice coils are provided side by side, and two pieces of the driving magnets are respectively disposed at positions corresponding to the positions of the voice coils.
- the two voice coils share one of the magnetic conductive members.
- the housing has a rectangular structure, and the voice coil, the driving magnet and the long sides of the armature are parallel to the long sides of the housing.
- the height of the armature is smaller than the height of the voice coil
- the shape of the driving magnet is the same as that of the armature and the size is smaller than the size of the center hole of the voice coil.
- the shape of the drive magnet is the same as the armature and the size is equal to or larger than the size of the center hole of the voice coil.
- the housing of the moving magnetic speaker of the present invention houses a diaphragm and a voice coil disposed in parallel with the diaphragm, a driving magnet is fixed to a side of the diaphragm close to the voice coil, and when the voice coil passes the alternating audio current, The voice coil will form an electromagnet, and the repulsive force or attractive force will be generated between the electromagnet and the driving magnet. Since the voice coil is fixed, the driving magnet will vibrate up and down, thus driving the diaphragm together with the driving magnet. Vibration, which inspires the sound of the air to achieve the function of the speaker.
- the principle of the utility model is to change the ampere force generated by the original voice coil cutting magnetic induction line into the force between the electromagnet and the permanent magnet, thereby improving the high-frequency transient response of the moving coil speaker.
- the high-frequency performance is improved; at the same time, the F0 of the speaker can be made low and the sensitivity is high, which can be used to make a larger speaker and has a wide range of applications.
- the armature Since the armature is disposed in the center hole of each voice coil, the armature is disposed opposite to the driving magnet and spaced apart, and the armature changes its magnetization direction according to the change of the current direction through the voice coil.
- the voice coil When the voice coil is energized, the armature can be magnetized, and the voice coil and the armature together form an electromagnet, which increases the strength of the magnetic field generated by the voice coil, enhances the force with the driving magnet, and improves the sensitivity of the speaker.
- the magnetic coil is provided with a magnetic conductive member, the magnetic conductive member can gather the magnetic field generated by the voice coil inward to reduce magnetic leakage, thereby effectively increasing the magnetic field strength, and further improving the sensitivity of the speaker.
- the diaphragm can be more uniformly stressed, the vibration stability and balance of the diaphragm are improved, and the polarization of the diaphragm is prevented.
- the positioning boss can play a positioning role when the speaker is assembled, which can reduce assembly difficulty and improve product consistency, and at the same time, the positioning boss and the magnetic conductive component are attached, which can increase
- the combined strength of the housing with the magnetically permeable components, the voice coil and the basin frame reduces the risk of the magnetically permeable components, the voice coil and the basin frame falling off the housing, and improves the reliability and service life of the product.
- the folding ring is composed of two folding rings with opposite bending directions.
- the diaphragm vibrates, it can effectively increase the rebound resilience of the folding ring and effectively improve.
- the diaphragm collapsed down badly.
- the movable magnetic speaker of the utility model solves the technical problems of high-frequency transient response difference of the moving coil type speaker in the prior art, and the high-frequency transient response of the movable magnetic speaker of the utility model is good, and at the same time, F0 is compared. Low, high sensitivity, high overall performance, able to meet the performance requirements of high fidelity equipment.
- FIG. 1 is a schematic exploded view showing the first embodiment of the movable magnetic speaker of the present invention
- FIG. 2 is a cross-sectional structural view showing a first embodiment of the moving magnetic speaker of the present invention
- FIG. 3 is a cross-sectional structural view showing a second embodiment of the moving magnetic speaker of the present invention.
- FIG. 4 is a cross-sectional structural view showing a third embodiment of the moving magnetic speaker of the present invention.
- Fig. 5 is a schematic view showing the working principle of the moving magnetic speaker of the present invention.
- orientations referred to in this specification refer to the orientation in which the diaphragm is located, and the azimuth refers to the orientation in which the voice coil is located.
- the inner side referred to in this specification refers to the side close to the center of the moving magnetic speaker, and the outer side refers to the side away from the center of the moving magnetic speaker.
- Embodiment 1 is a diagrammatic representation of Embodiment 1:
- a moving magnetic speaker has a rectangular parallelepiped structure and includes a rectangular annular casing 10 that is open at both ends.
- the diaphragm 10 houses a diaphragm and a voice coil 34 disposed in parallel with the diaphragm.
- a drive magnet 24a is fixed to a side of the diaphragm adjacent to the voice coil 34.
- the voice coil 34 is energized to form an electromagnet to interact with the drive magnet 24a.
- the force drives the diaphragm to vibrate.
- the lower end surface of the casing 10 is combined with a plate-shaped structure of the basin frame 30, and the voice coil 34 is fixed on a portion of the basin frame 30 located in the casing 10.
- the armature 36 is provided in the center hole of the voice coil 34, and the armature is provided. 36 is also fixed to the basin frame 30.
- the diaphragm is disposed above the voice coil 34, and the diaphragm includes a folding ring 22 whose edge portion is fixed on the upper end surface of the casing 10.
- a vibration plate 20 is fixed to a central portion of the folding ring 22, and the driving magnet 24a is fixed to the vibration plate 20 near the voice coil.
- the magnetization directions of the drive magnets 24a are both vertical, and the drive magnet 24a is disposed opposite to the armature 36. As shown in FIG. 1 and FIG.
- the voice coil 34 is provided in two rows, and the corresponding driving magnets 24a are also provided in two.
- the two voice coils 34 are runway-shaped structures. When the long sides of the two voice coils 34 are in contact, the center hole of the voice coil 34 is a long hole, and the armature 36 disposed in the center hole and the drive magnet 24a corresponding to the armature 36 are both The elongated structure, that is, the long sides of the voice coil 34, the drive magnet 24a, and the armature 36 are all parallel to the long sides of the housing 10.
- the voice coil 34 is covered with a plate-shaped magnetic conductive member 32 having a shape and size that is adapted to the shape and size of the voice coil 34, and the magnetic conductive member 32 and sound.
- a relief hole 320 is provided in a portion corresponding to the center hole of the ring 34.
- the two voice coils 34 share one magnetic conductive member 32, and the magnetic conductive member 32 can gather the magnetic field generated by the voice coil 34 toward the center hole of the voice coil 34 to reduce magnetic flux leakage.
- the height of the armature 36 is smaller than the height of the voice coil 34, that is, there is a certain difference between the upper surface of the armature 36 and the upper surface of the voice coil 34.
- the size of the driving magnet 24a is smaller than the size of the center hole of the voice coil 34, and the driving magnet 24a is of a height greater than the width.
- the lower surface of the driving magnet 24a is substantially flush with the upper surface of the voice coil 34, and the driving magnet 24a and the armature 36 are driven. There is room for vibration between them.
- the folding ring 22 is formed by two inner and outer connecting rings of opposite bending directions, that is, the folding ring 22 is connected by a plurality of upwardly protruding folding rings and a downwardly protruding folding ring.
- the embodiment is preferably a segment of the inner ring, that is, a segment of the ring adjacent to the vibrating plate 20 is upwardly convex, and a segment of the ring at the outer side is convex downward, and the arc of the upwardly protruding ring is larger than the downward convex. The curvature of the loop.
- the inner side of the side wall of the casing 10 is provided to the center level of the casing 10.
- the protruding positioning boss 12 is disposed on the four side walls of the housing 10 in the present embodiment, and two positioning bosses 12 are disposed on the short side wall of the housing 10, two The positioning bosses 12 correspond to the two voice coils 34, respectively.
- the positioning boss 12 is pressed against the magnetic conductive member 32, that is, the lower surface of the positioning boss 12 is attached and fixed to the upper surface of the magnetic conductive member 32.
- the moving magnetic speaker of the present invention further includes two FPCBs (flexible printed circuit boards) 40 for electrically connecting the voice coil 34 and an external audio circuit.
- FPCBs flexible printed circuit boards
- Embodiment 2 is a diagrammatic representation of Embodiment 1:
- This embodiment is basically the same as the first embodiment, and the difference is that:
- the height of the driving magnet 24b is larger, and the lower surface thereof exceeds the upper surface of the voice coil 34, that is, the lower end of the driving magnet 24b is inserted into the center hole of the voice coil 34, and the driving magnet 24b and the armature 36 are There is room for vibration between them.
- Embodiment 3 is a diagrammatic representation of Embodiment 3
- This embodiment is basically the same as the first embodiment, and the difference is that:
- the size of the driving magnet 24c coincides with the size of the center hole of the voice coil 34, or the size of the driving magnet 24c is larger than the size of the center hole of the voice coil 34, and the height of the driving magnet 24c is smaller than the width thereof.
- the working principle of the moving magnetic speaker of the present invention is as follows:
- the vibration direction of the diaphragm is a vertical direction.
- ⁇ and ⁇ represent the current direction in the voice coil 34, and ⁇ indicates that the current direction is perpendicular to the paper surface.
- ⁇ indicates that the current direction is perpendicular to the paper surface.
- the directions of the energizing currents of the two voice coils 34 are opposite, and the polarities of the two driving magnets 24a are also opposite.
- the upper end of the driving magnet 24a on the left side is set to the S pole, the lower end is the N pole, and the drive is located on the right side.
- the upper end of the magnet 24a is an N pole, and the lower end is an S pole.
- the present invention is not limited thereto.
- the energizing current directions of the two voice coils 34 may be the same, and the polarities of the two driving magnets 24a should be the same.
- the current direction of the two voice coils 34 is as shown. According to the right hand rule, the voice coil 34 on the left side produces an upward magnetic field. As indicated by the arrow 52, the armature 36 is located at the center of the voice coil 34.
- the upper end is an N pole, repelling the drive magnet 24a on the left side, and the moving direction of the drive magnet 24a on the left side is upward, as indicated by an arrow 56; at this time, the voice coil 34 on the right side generates a downward magnetic field.
- the upper end of the armature 36 located at the center of the voice coil 34 is an S pole, repelling the drive magnet 24a on the right side, and is located on the right side.
- the drive magnet 24a also moves upward as indicated by arrow 54 so that the diaphragm moves upward as indicated by arrow 58. When the current passing through the two voice coils 34 is reversed, the diaphragm will move downward to achieve vibration and sound.
- the moving magnetic speaker of the utility model fixes the voice coil to the casing, sticks the magnet to the diaphragm, and drives the vibration of the diaphragm by the movement of the magnet, and the driving principle is the ampere force generated by cutting the magnetic induction line from the original voice coil. It becomes the force between the electromagnet and the permanent magnet, which effectively improves the problem that the high-frequency transient of the moving coil speaker is correspondingly poor, and improves the performance of the speaker, so that it can satisfy the performance of the high-fidelity equipment. Claim.
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Abstract
本发明公开了一种动磁式扬声器，涉及电声产品技术领域，包括壳体，所述壳体内收容有振膜以及与所述振膜地平行设置在该振膜下方的音圈，所述振膜包括边缘部固定在所述壳体上的折环，所述折环的中部设置有振动板，所述振动板靠近所述音圈的一侧固定有驱动磁铁，所述音圈的中心孔内设置有衔铁，所述衔铁与所述驱动磁铁相对地布置且与所述驱动磁铁隔开，所述音圈通电后形成电磁铁，与所述驱动磁铁产生相互作用力使得所述驱动磁铁运动，由此带动所述振膜振动。本发明的动磁式扬声器解决了现有技术中动圈式扬声器高频瞬态响应差等技术问题，改进了高频瞬态响应，同时谐振频率较低，灵敏度好，整体性能高，能够满足高保真设备的性能要求。
Description
本实用新型涉及电声产品技术领域，特别涉及一种动磁式扬声器。
扬声器是便携式电子设备的重要声学部件，用于完成电信号与声音信号之间的转换，是一种能量转换器件。目前用于便携式电子设备中的扬声器多为动圈式扬声器，动圈式扬声器的工作原理是通电音圈在磁场中受到安培力的作用，带动振膜振动发声，由于其原理的问题，动圈式扬声器在高频瞬态响应上很难有提升，高频性能较低，不能够满足现在Hi-Fi(高保真)设备的性能要求。
实用新型内容
针对以上缺陷，本实用新型所要解决的技术问题是提供一种动磁式扬声器，此动磁式扬声器高频瞬态响应好，同时F0(谐振频率)较低，整体性能高。
为解决上述技术问题，本实用新型的技术方案是：
提供一种动磁式扬声器，包括壳体，所述壳体内收容有振膜以及与所述振膜平行地设置在该振膜下方的音圈，所述振膜包括边缘部固定在所述壳体上的折环，所述折环的中部设置有振动板，所述振动板靠近所述音圈的一侧固定有驱动磁铁，所述音圈的中心孔内设置有衔铁，所述衔铁与所述驱动磁铁相对地布置且与所述驱动磁铁隔开，所述音圈通电后形成电磁铁，与所述驱动磁铁产生相互作用力驱动所述振膜振动。
其中，所述音圈上覆盖有导磁部件，所述导磁部件对应所述音圈的中心孔的位置设有避让孔。
其中，所述折环由弯折方向相反的两段折环连接而成，靠近所述振动板的一段折环向上凸起且其弧度大于另一段折环的弧度。
其中，所述壳体为两端开口的环形结构，所述壳体的下端面上结合有盆架，所述音圈和所述衔铁固定在所述盆架上；所述折环的边缘部固定在所述壳体的上端面。
其中，所述壳体的侧壁内侧设有向所述壳体的中心伸出的定位凸台，所述定位凸台的下表面与所述导磁部件的上表面相贴合。
其中，所述音圈并排设有两个，在与所述音圈位置对应处分别设置两块所述驱动磁铁。
其中，两所述音圈共用一个所述导磁部件。
其中，所述壳体为长方形结构，所述音圈、所述驱动磁铁和所述衔铁的长边均与所述壳体的长边相平行。
作为一种实施方式，所述衔铁的高度小于所述音圈的高度，所述驱动磁铁的形状与所述衔铁相同且尺寸小于所述音圈的中心孔的尺寸。
作为另一种实施方式，所述驱动磁铁的形状与所述衔铁相同且尺寸与所述音圈的中心孔的尺寸相一致或大于所述音圈中心孔的尺寸。
采用了上述技术方案后，本实用新型的有益效果是：
由于本实用新型的动磁式扬声器的壳体内收容有振膜以及与振膜平行设置的音圈，振膜靠近音圈的一侧固定有驱动磁铁，当音圈通过交变的音频电流时，音圈会形成电磁铁，该电磁铁与驱动磁铁之间会产生相互作用的排斥力或吸引力，由于音圈是固定的，因此驱动磁铁会上下振动，因而带动振膜随着驱动磁铁一同上下振动，从而策动空气发声，实现扬声器的功能。本实用新型的原理是将原有音圈切割磁感线产生的安培力变成了电磁铁与永磁体之间的作用力，从而改善了动圈式扬声器高频瞬态响应不佳的情况，提升了高频性能；同时扬声器的F0可以做得很低，灵敏度也较高，可以用来做成较大的扬声器，应用范围广泛。
由于各音圈的中心孔内设置有衔铁，衔铁与驱动磁铁相对且隔开地设置，衔铁根据通过音圈的电流方向的变化而改变自身的磁化方向。音圈通电时能够将衔铁磁化，音圈与衔铁共同构成了电磁铁，增加了音圈产生的磁场强度，增强了与驱动磁铁之间的作用力，能够提高扬声器的灵敏度。
由于音圈上设有导磁部件，导磁部件能够将音圈产生的磁场向内聚拢，减少漏磁，能够有效的提高磁场强度，能够进一步的提高扬声器的灵敏度。
由于音圈和驱动磁铁均设有两个，可使得振膜受力更均匀，提高了振膜的振动稳定性和平衡性，防止振膜偏振。
由于壳体的内壁上设有定位凸台，在扬声器装配时，定位凸台能够起到定位作用，能够降低装配难度，提高产品一致性，同时定位凸台与导磁部件相贴合，能够增加壳体与导磁部件、音圈和盆架的结合强度，降低了导磁部件、音圈和盆架从壳体上脱落的风险，提高了产品的可靠性和使用寿命。
由于振膜由弯折方向相反的两段折环构成，折环由弯折方向相反的两段折环构成，在振膜振动时，可有效的增加折环的支撑回弹能力，有效的改善了振膜向下塌陷的不良。
综上所述，本实用新型动磁式扬声器解决了现有技术中动圈式扬声器高频瞬态响应差等技术问题，本实用新型动磁式扬声器的高频瞬态响应好，同时F0较低，灵敏度好，整体性能高，能够满足高保真设备的性能要求。
图1是本实用新型动磁式扬声器实施例一的分解结构示意图；
图2是本实用新型动磁式扬声器实施例一的剖视结构示意图；
图3是本实用新型动磁式扬声器实施例二的剖视结构示意图；
图4是本实用新型动磁式扬声器实施例三的剖视结构示意图；以及
图5是本实用新型动磁式扬声器的工作原理示意图。
图中附图标记说明：
10：壳体，12：定位凸台，20：振动板，22：折环，24a：驱动磁铁，24b：驱动磁铁，24c：驱动磁铁，30：盆架，32：导磁部件，320：避让孔，34：音圈，36：衔铁，40：FPCB，50～58：箭头。
下面结合附图和实施例，进一步阐述本实用新型。
本说明书中涉及到的方位上均指振膜所处的方位，方位下均指音圈所处的方位。本说明书中涉及到的内侧指靠近动磁式扬声器中心的一侧，外侧指远离动磁式扬声器中心的一侧。
实施例一：
如图1和图2共同所示，一种动磁式扬声器，为长方体结构，包括上下两端开口的长方形的环状壳体10。壳体10内收容有振膜以及与振膜平行设置的音圈34，振膜靠近音圈34的一侧固定有驱动磁铁24a；音圈34通电后形成电磁铁，与驱动磁铁24a产生相互作用力驱动振膜振动发声。本实施方式中壳体10的下端面结合有板状结构的盆架30，音圈34固定在盆架30位于壳体10内的部位上，音圈34的中心孔内设有衔铁36，衔铁36也固定在盆架30上。振膜设置在音圈34的上方，振膜包括边缘部固定在壳体10上端面上的折环22，折环22的中部固定有振动板20，驱动磁铁24a固定在振动板20靠近音圈34的一侧，驱动磁铁24a的磁化方向均为竖向，驱动磁铁24a与衔铁36相对设置。如图1和图2共同所示，本实施方式优选音圈34并排设有两个，相应的驱动磁铁24a也设有两个。两音圈34为跑道形结构，两音圈34的长边相接触，则音圈34的中心孔为长孔，设置在中心孔内的衔铁36和与衔铁36相对应的驱动磁铁24a均为长条结构，即音圈34、驱动磁铁24a和衔铁36的长边均与壳体10的长边相平行。
如图1和图2共同所示，音圈34上覆盖有板状的导磁部件32，导磁部件32的形状和尺寸与音圈34的形状和尺寸相适配，导磁部件32与音圈34的中心孔相对应的部位设有避让孔320。本实施方式优选两个音圈34共用一个导磁部件32，导磁部件32能够将音圈34产生的磁场向音圈34的中心孔处聚拢，减少漏磁。
如图1和图2共同所示，本实施方式中衔铁36的高度小于音圈34的高度，即衔铁36的上表面与音圈34的上表面之间有一定的落差。驱动磁铁24a的尺寸小于音圈34的中心孔的尺寸，且驱动磁铁24a为高度大于宽度的结构，驱动磁铁24a的下表面与音圈34的上表面基本齐平，驱动磁铁24a与衔铁36之间留有振动空间。
如图1和图2共同所示，折环22由弯折方向相反的两段折环内外连接构成，即折环22由一段个向上凸起的折环和一段向下凸起的折环连接而成。本实施方式优选位于内侧的一段折环，即靠近振动板20的一段折环向上凸起，位于外侧的一段折环向下凸起，且向上凸起的折环的弧度大于向下凸起的折环的弧度。
如图1和图2共同所示，壳体10的侧壁内侧设有向壳体10的中心水平
伸出的定位凸台12，本实施方式优选壳体10的四条侧壁上均设有定位凸台12，且位于壳体10的短边侧壁上设有两个定位凸台12，两个定位凸台12分别与两音圈34相对应。定位凸台12压在导磁部件32上，即定位凸台12的下表面与导磁部件32的上表面相贴合固定。
如图1所示，本实用新型动磁式扬声器还包括两FPCB(柔性印刷电路板)40，用于电连接音圈34与外部音频电路。
实施例二：
本实施方式与实施例一基本相同，其不同之处在于：
如图3所示，驱动磁铁24b的高度更大，其下表面超过了音圈34的上表面，即驱动磁铁24b的下端插入到音圈34的中心孔内，且驱动磁铁24b与衔铁36之间留有振动空间。
实施例三：
本实施方式与实施例一基本相同，其不同之处在于：
如图4所示，驱动磁铁24c的尺寸与音圈34的中心孔的尺寸相一致，或者驱动磁铁24c的尺寸大于音圈34的中心孔的尺寸，此驱动磁铁24c的高度小于其宽度，为扁平结构，本实施方式需要在驱动磁铁24c与导磁部件32之间留有足够的振动空间。
如图5所示，本实用新型动磁式扬声器的工作原理如下：
以实施例一所描述的动磁式扬声器为例进行说明，振膜的振动方向为竖直方向，图示中⊙和⊕代表音圈34内的电流方向，⊙表示电流方向垂直于纸面向外，⊕表示电流方向垂直于纸面向内。本实施方式优选两音圈34的通电电流方向相反，则两驱动磁铁24a的极性也相反，设定位于左侧的驱动磁铁24a的上端为S极，下端为N极，位于右侧的驱动磁铁24a的上端为N极，下端为S极。但并不限于此，实际应用中两音圈34的通电电流方向也可以相同，则两驱动磁铁24a的极性也应相同。两个音圈34的电流方向如图所示，根据右手定则，此时位于左侧的音圈34产生的是向上的磁场，如箭头52所示，则位于该音圈34中心的衔铁36的上端为N极，与位于左侧的驱动磁铁24a相排斥，位于左侧的驱动磁铁24a的运动方向向上，如箭头56所示；此时位于右侧的音圈34产生向下的磁场，如箭头50所示，则位于该音圈34中心的衔铁36的上端为S极，与位于右侧的驱动磁铁24a相排斥，位于右侧的
驱动磁铁24a也向上运动，如箭头54所示，从而振膜向上运动，如箭头58所示。当两音圈34内通过的电流换向时，振膜将向下运动，从而实现振动发声。
本实用新型的动磁式扬声器将音圈固定在壳体，将磁铁粘贴到振膜上，通过磁铁的运动来带动振膜振动发声，将驱动原理由原来音圈切割磁感线产生的安培力变成了电磁铁与永磁铁之间的作用力，从原理上有效的改善了动圈式扬声器高频瞬态相应不佳的问题，提高了扬声器的性能，使得其能够满足高保真设备的性能要求。
本实用新型不局限于上述具体的实施方式，本领域的普通技术人员从上述构思出发，不经过创造性的劳动，所做出的种种变换，均落在本实用新型的保护范围之内。
Claims (10)
- 一种动磁式扬声器，包括壳体，其特征在于，所述壳体内收容有振膜以及与所述振膜平行地设置在该振膜下方的音圈，所述振膜包括边缘部固定在所述壳体上的折环，所述折环的中部设置有振动板，所述振动板靠近所述音圈的一侧固定有驱动磁铁，所述音圈的中心孔内设置有衔铁，所述衔铁与所述驱动磁铁相对地布置且与所述驱动磁铁隔开，所述音圈通电后形成电磁铁，与所述驱动磁铁产生相互作用力使得所述驱动磁铁运动，由此带动所述振膜振动。
- 根据权利要求1所述的动磁式扬声器，其特征在于，所述音圈上覆盖有导磁部件，所述导磁部件对应所述音圈的中心孔的位置设有避让孔。
- 根据权利要求1所述的动磁式扬声器，其特征在于，所述折环由弯折方向相反的两段折环连接而成，靠近所述振动板的一段折环向上凸起且其弧度大于另一段折环的弧度。
- 根据权利要求2所述的动磁式扬声器，其特征在于，所述壳体为两端开口的环形结构，所述壳体的下端面上结合有盆架，所述音圈和所述衔铁固定在所述盆架上；所述折环的边缘部固定在所述壳体的上端面上。
- 根据权利要求4所述的动磁式扬声器，其特征在于，所述壳体的侧壁内侧设有向所述壳体的中心伸出的定位凸台，所述定位凸台的下表面与所述导磁部件的上表面相贴合。
- 根据权利要求2至5任一权利要求所述的动磁式扬声器，其特征在于，所述音圈并排设有两个，在与所述音圈位置对应处分别设置两块所述驱动磁铁。
- 根据权利要求6所述的动磁式扬声器，其特征在于，两个所述音圈共用一个所述导磁部件。
- 根据权利要求6所述的动磁式扬声器，其特征在于，所述壳体为长方形结构，所述音圈、所述驱动磁铁和所述衔铁的长边均与所述壳体的长边相平行。
- 根据权利要求6所述的动磁式扬声器，其特征在于，所述衔铁的高度小于所述音圈的高度，所述驱动磁铁的形状与所述衔铁相同且尺寸小于所述音圈的中心孔的尺寸。
- 根据权利要求6所述的动磁式扬声器，其特征在于，所述驱动磁铁的形状与所述衔铁相同且尺寸与所述音圈的中心孔的尺寸相一致或大于所述音圈中心孔的尺寸。
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| CN102204278A (zh) * | 2009-07-27 | 2011-09-28 | 中井重之 | 动磁铁式扬声器及其制造方法 |
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