CN109413553B - Equal magnetic loudspeaker - Google Patents
Equal magnetic loudspeaker Download PDFInfo
- Publication number
- CN109413553B CN109413553B CN201811351034.XA CN201811351034A CN109413553B CN 109413553 B CN109413553 B CN 109413553B CN 201811351034 A CN201811351034 A CN 201811351034A CN 109413553 B CN109413553 B CN 109413553B
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- Prior art keywords
- vibrating diaphragm
- neodymium iron
- permanent magnet
- iron boron
- diaphragm
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- 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
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/02—Details
-
- 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
Abstract
The invention relates to an equal magnetic loudspeaker, which comprises a vibrating diaphragm and at least one group of permanent magnet arrays, wherein the periphery of the vibrating diaphragm is fixed on a frame, and each permanent magnet array is composed of a plurality of strip neodymium iron boron magnets which are parallel to each other; the neodymium iron boron magnets of each group of permanent magnet arrays are arranged on a virtual plane parallel to the vibrating diaphragm at intervals and are arranged corresponding to the voice coil coated on the vibrating diaphragm; in each group of permanent magnet arrays, the maximum magnetic energy product of the NdFeB magnets positioned at the two sides is larger than that of the NdFeB magnets positioned at the middle part. The invention adopts the neodymium iron boron magnet combination with different performances to optimize the magnetic circuit structure, thereby reducing the difference of the vibration direction and the amplitude of each part of the vibrating diaphragm, reducing the distortion and improving the tone quality. Meanwhile, the whole amplitude of the loudspeaker diaphragm is greatly increased, the acoustic power and the low frequency are effectively improved, and the miniaturization of the flat panel loudspeaker is facilitated.
Description
Technical Field
The invention relates to the technical field of loudspeakers, in particular to an equal magnetic loudspeaker.
Background
The driver of the iso-magnetic speaker is similar to a reduced-size flat speaker in that a flat voice coil is embedded in a thin and light diaphragm, like a printed circuit board, to evenly distribute the driving force. The magnet is concentrated on one or both sides of the diaphragm (push-pull type), which vibrates in the magnetic field it forms. Equal-magnet earphone diaphragms are not as light as electrostatic earphone diaphragms, but have the same large vibration area and similar tone quality.
The constant magnetic speaker combines the advantages of both a moving coil speaker and an electrostatic speaker, has better performance in low frequency than the electrostatic speaker, and is stronger than the moving coil speaker in high frequency, the transducer of the core structure is generally that a plurality of strip-shaped permanent magnets are arranged on a magnetic yoke in parallel, a vibrating diaphragm is arranged in parallel relative to the magnetic pole surfaces of the permanent magnets, the periphery of the vibrating diaphragm is fixed on a frame and is in a tension state, and a coil is arranged on the vibrating diaphragm at a position opposite to the permanent magnets. The current flowing inside the coil is orthogonal to the magnetic field generated by the permanent magnet. In this way, when an alternating current flows through the coil, the coil generates a force according to faraday's law, and the diaphragm vibrates in the vertical direction by the force, the alternating current signal is converted into an acoustic signal.
From the above, the maximum amplitude of the vibrating diaphragm of the equal magnetic loudspeaker is limited by the distance between the vibrating diaphragm and the permanent magnet, and in order to ensure the magnetic field intensity at the vibrating diaphragm, the distance between the vibrating diaphragm and the permanent magnet is very small, so the amplitude of the equal magnetic loudspeaker is also very small. To ensure sound pressure and low frequency, only a relatively large area of diaphragm can be used.
When the coil is stressed, the diaphragm deforms, the edge of the diaphragm is constrained by the frame, the deformation amount is smaller, meanwhile, the deformation amount of the part of the diaphragm, which is attached with the rigid coil, is smaller, and the deformation amount of the part of the diaphragm, which is not attached with the coil, is larger, so that the amplitude of the whole diaphragm is the maximum at the central position, and then the deformation amounts gradually decrease towards the edge (the dotted line in fig. 1 is a schematic diagram). This not only results in a further reduction of the actual average amplitude of the flat loudspeaker, but also in a relative movement of the diaphragm everywhere, increasing distortion.
Disclosure of Invention
The invention aims to provide an equal magnetic loudspeaker aiming at the defects of the prior art, wherein a neodymium iron boron magnet with different properties is adopted to optimize a magnetic circuit structure, so that the difference of the vibration direction and the vibration amplitude of each part of a vibrating diaphragm is reduced, the integral vibration amplitude of the loudspeaker is greatly increased, and the distortion is reduced.
In order to achieve the aim, the invention provides a vibrating diaphragm of a flat loudspeaker, which is realized by the following technical scheme that the vibrating diaphragm comprises a vibrating diaphragm and at least one group of permanent magnet arrays, wherein the periphery of the vibrating diaphragm is fixed on a frame, and each permanent magnet array is composed of a plurality of strip neodymium iron boron magnets which are parallel to each other; the neodymium iron boron magnets of each group of permanent magnet arrays are arranged on a virtual plane parallel to the vibrating diaphragm at intervals and are arranged corresponding to the voice coil coated on the vibrating diaphragm; the maximum magnetic energy product of the neodymium iron boron magnet in each group of permanent magnet array is larger than that of the middle part.
The invention also provides an equal-magnetism type loudspeaker, which comprises a vibrating diaphragm and at least one group of permanent magnet arrays, wherein the periphery of the vibrating diaphragm is fixed on the frame, and each permanent magnet array is composed of a plurality of strip neodymium iron boron magnets which are parallel to each other; the neodymium iron boron magnets of each group of permanent magnet arrays are arranged on a virtual plane parallel to the vibrating diaphragm at intervals and are arranged corresponding to the voice coil coated on the vibrating diaphragm; in each group of permanent magnet arrays, the thickness of the neodymium iron boron magnets positioned at two sides is larger than that of the neodymium iron boron magnets positioned at the middle part.
The maximum magnetic energy product value range of the neodymium iron boron magnet is 223J/m3-422J/m3。
The grade of the neodymium iron boron magnet is selected from N30, N33, N35, N38, N40, N42, N45, N48, N50 and N52.
The permanent magnet arrays are two groups and are respectively positioned on two sides of the vibrating diaphragm.
The permanent magnet array is a group and is positioned on one side of the vibrating diaphragm.
The diaphragm shape is oval, neodymium iron boron magnetism body is on a parallel with the major axis setting of this oval diaphragm.
Compared with the prior art, the invention has the beneficial effects that:
1. the neodymium iron boron magnet combination with different performances is adopted to optimize the magnetic circuit structure, so that the difference of vibration directions and amplitudes of all parts of the vibrating diaphragm is reduced, the distortion is reduced, and the tone quality is improved.
2. The whole amplitude of the loudspeaker diaphragm is greatly increased, the acoustic power and the low frequency are effectively improved, and the miniaturization of the flat panel loudspeaker is facilitated.
Drawings
The above features and advantages of the present invention will become more apparent and readily appreciated from the following description of the exemplary embodiments thereof taken in conjunction with the accompanying drawings.
Fig. 1 is a schematic diagram of a structure of a first surface layer portion of an equivalent magnetic speaker in embodiment 1 of the present invention.
Fig. 2 is a schematic structural diagram of a second surface layer portion of an equivalent magnetic speaker in embodiment 1 of the present invention.
Fig. 3 is a sectional view of the assembled first surface layer and second surface layer of the equal magnetic speaker according to embodiment 1 of the present invention.
Fig. 4 is a schematic diagram of a first surface layer portion of an elliptic iso-magnetic speaker according to embodiment 2 of the present invention.
Detailed Description
The invention is described in further detail below with reference to the attached drawing figures to facilitate understanding by those skilled in the art:
as shown in fig. 1 to 4, the reference numerals in the drawings denote: vibrating diaphragm 1, frame 2, voice coil loudspeaker voice coil 3, wire 4, strip neodymium iron boron magnet 5.
Example 1
Referring to fig. 1-3, fig. 1 is a schematic diagram of a first surface layer portion structure of an equal magnetic speaker according to the present invention (overlapping and adjacent to a second layer in a spatial projection, and may be a double layer or multiple layers distributed on two sides of the second surface layer), and fig. 2 is a schematic diagram of a second surface layer portion structure of an equal magnetic speaker according to the present invention (overlapping and adjacent to a first layer in a spatial projection). Fig. 3 is a sectional view of the assembled first and second surface layers of the present invention for an isometric speaker. In the present embodiment, a flat panel speaker is first proposed, in which a diaphragm 1 is circular, the periphery of the diaphragm is fixed on a frame 2, a voice coil 3 is laid on the diaphragm 1, and the voice coil 3 is in a winding serpentine structure. The frame 2 is also provided with two leads 4 electrically connected with two ends of the voice coil. Two sides of the vibrating diaphragm 1 are respectively provided with a group of permanent magnet arrays, each permanent magnet array is composed of a plurality of strip neodymium iron boron magnets 5 which are parallel to each other, and the neodymium iron boron magnets 5 of each group of permanent magnet arrays are arranged at intervals on a virtual plane which is parallel to the vibrating diaphragm 1 and are arranged corresponding to the voice coil 2 laid on the vibrating diaphragm 1. The structure is the same as that of a conventional flat panel speaker, and the difference is that in each group of permanent magnet arrays, the maximum magnetic energy product of the neodymium iron boron magnets 5 positioned on two sides is larger than that of the neodymium iron boron magnets 5 positioned in the middle, the magnetic energy products can be sequentially decreased, the range of the magnets in the middle can be any combination of M2-M8 or any one of M2-M8, and the specific magnetic energy product range is selected according to different earphone design requirements.
In the embodiment of the invention, the maximum energy product value range of the NdFeB magnet is 223J/m3-422J/m3. The grade of the neodymium iron boron magnet is selected from N30, N33, N35, N38, N40, N42, N45, N48, N50 and N52.
Compared with the prior art, the invention has the beneficial effects that:
1. the neodymium iron boron magnet combination with different performances is adopted to optimize the magnetic circuit structure, so that the difference of vibration directions and amplitudes of all parts of the vibrating diaphragm is reduced, the distortion is reduced, and the tone quality is obviously improved.
2. The whole amplitude of the loudspeaker diaphragm is greatly increased, the acoustic power and the low frequency are effectively improved, and the miniaturization of the flat panel loudspeaker is facilitated.
Example 2:
referring to fig. 4, fig. 4 is a schematic diagram of a first surface layer portion structure of an isometric magnetic speaker embodiment 2 according to the invention. The main difference between this embodiment 2 and embodiment 1 is that the diaphragm 1 is in an oval shape, and the ndfeb magnet 5 is disposed parallel to the long axis of the oval diaphragm 1, the range of the middle magnet may be any combination of M2-M8, or any one of M2-M8, and the specific range of the magnetic energy product is selected according to different earphone design requirements.
The purpose of this is: oval vibrating diaphragm is when deformation, and the edge curvature of its major axis both sides is lower, and the gradient of amplitude variation curve is bigger in its minor axis direction when the vibration, when neodymium iron boron magnetism iron 5 corresponds the major axis setting, can effectively reduce the degree of difficulty of the vibration range difference everywhere of control vibrating diaphragm.
Example 3
Referring to fig. 1-3, fig. 1 is a schematic diagram of a first surface layer portion structure of an equal magnetic speaker according to the present invention (overlapping and adjacent to a second layer in a spatial projection, and may be a double layer or multiple layers distributed on two sides of the second surface layer), and fig. 2 is a schematic diagram of a second surface layer portion structure of an equal magnetic speaker according to the present invention (overlapping and adjacent to a first layer in a spatial projection). Fig. 3 is a cross-sectional view of the assembled first and second surface layers of the present invention for an isometric speaker. In the present embodiment, a flat panel speaker is first proposed, in which a diaphragm 1 is circular, the periphery of the diaphragm is fixed on a frame 2, a voice coil 3 is laid on the diaphragm 1, and the voice coil 3 is in a winding serpentine structure. The frame 2 is also provided with two leads 4 electrically connected with two ends of the voice coil. Two sides of the vibrating diaphragm 1 are respectively provided with a group of permanent magnet arrays, each permanent magnet array is composed of a plurality of strip neodymium iron boron magnets 5 which are parallel to each other, and the neodymium iron boron magnets 5 of each group of permanent magnet arrays are arranged at intervals on a virtual plane which is parallel to the vibrating diaphragm 1 and are arranged corresponding to the voice coil 2 laid on the vibrating diaphragm 1. The structure is the same as the structure of a conventional flat panel loudspeaker, and the difference is that the thicknesses of the NdFeB magnets positioned on the two sides are larger than that of the NdFeB magnet positioned in the middle, and the magnetic energy product size can be decreased progressively in sequence. The range of the middle magnet can be any combination of M2-M8 or any one of M2-M8, and the specific magnetic energy product range selects permanent magnets with different sizes and materials according to different earphone design requirements.
In the embodiment of the invention, the maximum energy product value range of the NdFeB magnet is 223J/m3-422J/m3. The grade of the neodymium iron boron magnet is selected from N30, N33, N35, N38, N40, N42, N45, N48, N50 and N52.
The purpose of this is: oval vibrating diaphragm is when deformation, and the edge curvature of its major axis both sides is lower, and the steepness of amplitude variation curve is bigger in its minor axis direction when the vibration, and when neodymium iron boron magnet 5 set up different thickness corresponding to the major axis, can the block scope of effective control magnetic energy product, makes the vibrating diaphragm can be according to the better matching amplitude difference of design parameter.
Although the invention is described in detail with reference to the embodiments, it should be understood by those skilled in the art that the above embodiments are only one of the preferred embodiments of the invention, and not all embodiments can be listed herein for the sake of brevity, and any embodiment that can embody the claims of the invention is within the scope of the invention.
It should be noted that the above-mentioned embodiments are provided for further detailed description of the present invention, and the present invention is not limited to the above-mentioned embodiments, and those skilled in the art can make various modifications and variations on the above-mentioned embodiments without departing from the scope of the present invention.
Claims (2)
1. An equal magnetic loudspeaker comprises a vibrating diaphragm and at least one group of permanent magnet arrays, wherein the periphery of the vibrating diaphragm is fixed on a frame, and each permanent magnet array is composed of a plurality of strip neodymium iron boron magnets which are parallel to each other; neodymium iron with each group of permanent magnet arrayThe boron magnets are arranged on a virtual plane parallel to the vibrating diaphragm at intervals and are arranged corresponding to the voice coil coated on the vibrating diaphragm; the method is characterized in that: in each group of permanent magnet arrays, the maximum energy product of the NdFeB magnets positioned at two sides is larger than that of the NdFeB magnets positioned at the middle part, and the value range of the maximum energy product of the NdFeB magnets is 223J/m3-422J/m3The permanent magnet array is two sets of, and is located respectively the vibrating diaphragm both sides, the neodymium iron boron magnet thickness that is located both sides are greater than the thickness that is located the neodymium iron boron magnet at middle part, the vibrating diaphragm shape is oval, neodymium iron boron magnet is on a parallel with the major axis setting of this oval vibrating diaphragm from M1 to M9 9 permanent magnets altogether, and the magnetic energy product scope of its middle part magnet is arbitrary magnetic energy product combination in M2-M8.
2. The isometric loudspeaker of claim 1 wherein: the grade of the neodymium iron boron magnet is selected from N30, N33, N35, N38, N40, N42, N45, N48, N50 and N52.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811351034.XA CN109413553B (en) | 2018-11-14 | 2018-11-14 | Equal magnetic loudspeaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811351034.XA CN109413553B (en) | 2018-11-14 | 2018-11-14 | Equal magnetic loudspeaker |
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| CN109413553A CN109413553A (en) | 2019-03-01 |
| CN109413553B true CN109413553B (en) | 2020-05-26 |
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| CN201811351034.XA Active CN109413553B (en) | 2018-11-14 | 2018-11-14 | Equal magnetic loudspeaker |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113132868A (en) * | 2021-04-23 | 2021-07-16 | 维沃移动通信有限公司 | Speaker, amplitude adjusting method, amplitude adjusting device, and electronic apparatus |
| CN113873405A (en) * | 2021-09-02 | 2021-12-31 | 头领科技（昆山）有限公司 | Flat earphone |
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| CN107995573B (en) * | 2017-12-27 | 2024-03-19 | 潍坊歌尔丹拿电子科技有限公司 | Loudspeaker |
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| CN1512818A (en) * | 2002-12-27 | 2004-07-14 | 松下电器产业株式会社 | Electroacoustic converter and electronic device |
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Effective date of registration: 20201217 Address after: 2 / F, North building, 1339 Shuixiu Road, Yushan Town, Kunshan City, Suzhou City, Jiangsu Province Patentee after: HEAD-DIRECT (KUNSHAN) Co.,Ltd. Address before: Building b-824, No. 5, Lanyuan Road, Huayuan Industrial Park, Binhai New Area, Xiqing District, Tianjin Patentee before: HIFIMAN (TIANJIN) TECHNOLOGY Co.,Ltd. |
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Address after: No. 2001, Yingbin West Road, Bacheng Town, Kunshan City, Suzhou City, Jiangsu Province, 215311 Patentee after: Kunshan Haifeiman Technology Group Co.,Ltd. Address before: 2 / F, North building, 1339 Shuixiu Road, Yushan Town, Kunshan City, Suzhou City, Jiangsu Province Patentee before: HEAD-DIRECT (KUNSHAN) Co.,Ltd. |
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Address after: 215300 No. 2001 Yingbin West Road, Bacheng Town, Kunshan City, Suzhou City, Jiangsu Province Patentee after: Kunshan Haifeiman Technology Group Co.,Ltd. Address before: No. 2001, Yingbin West Road, Bacheng Town, Kunshan City, Suzhou City, Jiangsu Province, 215311 Patentee before: Kunshan Haifeiman Technology Group Co.,Ltd. |