CN114051197A - Planar coil ring Halbach magnetic array loudspeaker - Google Patents
Planar coil ring Halbach magnetic array loudspeaker Download PDFInfo
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- CN114051197A CN114051197A CN202111470296.XA CN202111470296A CN114051197A CN 114051197 A CN114051197 A CN 114051197A CN 202111470296 A CN202111470296 A CN 202111470296A CN 114051197 A CN114051197 A CN 114051197A
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- 238000003491 array Methods 0.000 claims abstract description 30
- 238000004519 manufacturing process Methods 0.000 claims abstract description 11
- 125000004122 cyclic group Chemical group 0.000 claims abstract description 3
- 230000005236 sound signal Effects 0.000 claims description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 6
- 230000006698 induction Effects 0.000 abstract description 3
- 229910052742 iron Inorganic materials 0.000 abstract description 3
- 230000035945 sensitivity Effects 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 6
- 238000009826 distribution Methods 0.000 description 5
- 239000012528 membrane Substances 0.000 description 5
- 230000008602 contraction Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 210000003813 thumb Anatomy 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 210000003811 finger Anatomy 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 230000005855 radiation Effects 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
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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
- H04R9/02—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
- H04R9/02—Details
- H04R9/04—Construction, mounting, or centering of coil
-
- 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
- H04R2209/022—Aspects regarding the stray flux internal or external to the magnetic circuit, e.g. shielding, shape of magnetic circuit, flux compensation coils
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- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
Abstract
The invention discloses a planar coil annular Halbach magnetic array loudspeaker, which comprises: a diaphragm, a voice coil, and a ring magnet; the annular magnet is composed of two annular Halbach magnetic arrays which are coaxially arranged, the annular Halbach magnetic arrays form a magnetic field in a single direction in an inner cavity of the annular Halbach magnetic arrays, and the directions of the magnetic fields formed by the two annular Halbach magnetic arrays are opposite; the voice coil loudspeaker voice coil includes the coil that the perpendicular to magnetic field direction set up, the coil is the plane coil, just the upper end and the lower extreme of coil are located two respectively in the magnetic field of cyclic annular Halbach magnetic array, the coil is used for driving the vibrating diaphragm vibration sound production. The magnetic system of the loudspeaker adopts an annular Halbach magnetic array, the magnetic field is concentrated, a magnetic conduction plate or T iron does not need to be designed, the magnetic induction intensity is high, and the sensitivity of the loudspeaker can be improved; the voice coil of the loudspeaker adopts a planar coil, and is simple to manufacture and convenient to assemble.
Description
Technical Field
The invention relates to the technical field of loudspeakers, in particular to a planar coil annular Halbach magnetic array loudspeaker.
Background
Halbach Array (Halbach permanent magnet) is a magnet structure. In 1979, the American scholars Klaus Halbach discovered and developed the special permanent magnet structure through electron acceleration experiments, and finally the so-called Halbach magnet is formed. It is an engineered near-ideal structure that uses a special arrangement of magnet elements to increase the field strength per unit direction with the goal of producing the strongest magnetic field with the least amount of magnets. The array is completely made of rare earth permanent magnet materials, and by arranging the permanent magnets in different magnetizing directions according to a certain rule, magnetic lines of force can be converged on one side of the magnets, and the magnetic lines of force are weakened on the other side of the magnets, so that an ideal unilateral magnetic field is obtained. This is of great importance in engineering, and Halbach arrays are widely used in industrial fields with excellent magnetic field distribution characteristics.
Fig. 1-1 shows a single magnet with the north poles all facing upward, and it can be seen that the magnetic field is of uniform strength at the bottom and top of the magnet. Fig. 1-2 show a Halbach array, where it can be seen that the magnetic field is high at the top of the magnet, while the bottom is relatively weak. In general, the strong side surface magnetic field strength of a Halbach array magnet group under the same amount is about √ 2 times (about 1.4 times) of that of a traditional single magnet, especially when the thickness of the magnet in the magnetizing direction is 4-16 mm.
The straight line is the most basic form of Halbach array, and the array magnet can be viewed as a combination of a radial array and a tangential array, as shown in fig. 2-1 and 2-2 for Halbach arrays in two different arrangements. The linear Halbach array is mainly applied to linear motors and magnetic suspension trains at present.
Disclosure of Invention
The invention aims to provide a planar coil annular Halbach magnetic array loudspeaker for improving the performance of the loudspeaker.
In order to achieve the object, the present invention provides a planar coil annular Halbach magnetic array loudspeaker, comprising: a diaphragm, a voice coil, and a ring magnet; the annular magnet is composed of two annular Halbach magnetic arrays which are coaxially arranged, the annular Halbach magnetic arrays form a magnetic field in a single direction in an inner cavity of the annular Halbach magnetic arrays, and the directions of the magnetic fields formed by the two annular Halbach magnetic arrays are opposite; the voice coil loudspeaker voice coil includes the coil that the perpendicular to magnetic field direction set up, the coil is the plane coil, just the upper end and the lower extreme of coil are located two respectively in the magnetic field of cyclic annular Halbach magnetic array, the coil is used for driving the vibrating diaphragm vibration sound production.
When audio signals are applied to the coils, the coils are stressed in a magnetic field to generate telescopic motion along the axial direction of the annular magnet.
In a possible implementation manner, the two voice coils are fixed on a framework in a symmetrical distribution manner, and the framework is connected with the vibrating membrane.
In one possible implementation, the voice coil is a square or rectangular form coil, and the bobbin is a lightweight cylindrical bobbin.
In a possible implementation manner, the annular Halbach magnetic array is formed by concentrically surrounding a plurality of magnet units in a manner that the magnet units sequentially deflect 60 degrees in the magnetic pole direction.
In a possible implementation manner, the thickness of each annular Halbach magnetic array is slightly larger than half of the height of the voice coil, and the thickness of the annular magnet formed by bonding the two annular Halbach magnetic arrays together is larger than the height of the voice coil.
In other possible implementations, a plurality of voice coils may be provided and wound side by side on the frame.
According to the technical scheme, the embodiment of the invention has the following advantages:
(1) according to the loudspeaker, the magnetic system adopts the annular Halbach magnetic array, so that the magnetic force lines are almost completely positioned in the cylindrical cavity at the center of the magnetic system, and the outside is almost zero; thus: on one hand, the magnetic system does not need a magnetic conduction plate or T iron, and the magnetic lines of force are concentrated in the required area without guidance; on the other hand, the magnetic induction can be improved by about 1.4 times compared with the conventional loudspeaker, and the sensitivity of the loudspeaker can be correspondingly improved.
(2) The magnetic system of the loudspeaker adopts the annular Halbach magnetic array which forms a magnetic field in a single direction in the inner cavity, namely the magnetic system is a parallel magnetic field system instead of a radiation magnetic field system, so that the application requirement on the magnetic gauge in the assembling process is much lower than that in the production of the conventional loudspeaker.
(3) According to the loudspeaker, the voice coil is a planar coil, two ends of the planar coil are respectively positioned in the magnetic fields of the two annular Halbach magnetic arrays, but the two ends of the planar coil are subjected to Ampere forces in the same direction, so that a vibration film of the loudspeaker can be driven to generate more efficiently; the planar coil has the advantages of simple manufacture, convenient assembly and convenient engineering application; the planar coil can be conveniently fixed on the cylindrical framework to integrally form a cylindrical voice coil, so that the shape of the voice coil is consistent with that of the voice coil of the existing conventional loudspeaker, and the production process of the existing loudspeaker is furthest used.
Drawings
In order to more clearly illustrate the technical solution of the embodiment of the present invention, the following briefly introduces the embodiment and the drawings used in the description of the prior art.
FIG. 1-1 is a magnetic field line profile for a single magnet;
FIGS. 1-2 are magnetic field lines profiles of a Halbach array;
FIGS. 2-1 and 2-2 are schematic structural views of Halbach arrays in two different arrangements, respectively;
fig. 3 is a schematic structural diagram of a planar coil annular Halbach magnetic array loudspeaker according to an embodiment of the present invention;
FIGS. 4-1 and 4-2 are a top view structural diagram and a magnetic force line distribution diagram, respectively, of a circular Halbach magnetic array;
FIG. 5 is a schematic view of a wire cutting magnetic field lines in one embodiment of the present invention;
FIG. 6 is a schematic view of the structure of a voice coil according to an embodiment of the present invention;
fig. 7 is a sectional structural view of a ring magnet in one embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terms "first," "second," "third," and the like in the description and in the claims, and in the above-described drawings, are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
Referring to fig. 3, an embodiment of the present invention provides a planar coil ring (i.e. circular ring shape, which is referred to as ring shape or ring shape) Halbach magnetic array speaker (hereinafter referred to as speaker). The speaker includes: a diaphragm 11, a voice coil, and a ring magnet.
Wherein, the annular magnet is composed of two identical annular Halbach magnetic arrays 12 which are coaxial, axially spaced at a certain distance (or closely connected), and circumferentially staggered at a certain angle. The annular Halbach magnet arrays 12 form a magnetic field in a single direction (as indicated by the arrow in fig. 7) in their bore, and the magnetic fields formed by the two annular Halbach magnet arrays 12 are in opposite directions.
The voice coil comprises a coil 13 perpendicular to the magnetic field direction, the coil 13 is a planar coil, and the upper end and the lower end of the coil 13 are respectively located in the magnetic fields of the two annular Halbach magnetic arrays 12. The coil 13 is used for: when an audio signal is applied, the force is applied in the magnetic field to generate a stretching motion along the axial direction of the annular magnet, so that the vibration film 11 is driven to vibrate and sound.
Two coils 13 can be arranged and fixed on a framework 14 in a symmetrical distribution mode, and the framework 14 is connected with the vibrating membrane 11. The bobbin 14 may be a light-weight cylindrical bobbin, and the voice coil 13 may be a coil in the form of a square or rectangle.
The thickness of each annular Halbach magnetic array is slightly larger than half of the height of a voice coil (coil), and the overall thickness of an annular magnet formed by bonding two annular Halbach magnetic arrays together is larger than the height of the voice coil so as to ensure that the upper end and the lower end of the coil 13 respectively work in the inner cavities of the two annular Halbach magnetic arrays 12.
Of course, the speaker may further include a frame for fixing the ring magnet and other conventional components, which are not described in detail herein.
The following is a more detailed description of the present invention with reference to specific examples.
1. Working principle of annular Halbach magnetic array loudspeaker
The annular Halbach magnetic array is a circular ring-shaped magnetic array formed by combining linear Halbach arrays end to end, as shown in fig. 4-1, the annular Halbach magnetic array is one form of the annular Halbach magnetic array adopted in the embodiment, as shown in fig. 4-2, the magnetic line of force distribution of the magnetic system of the annular Halbach magnetic array is shown, and it can be seen that a magnetic field in a single direction is formed in the inner cavity of the annular Halbach magnetic array.
The annular Halbach magnetic array loudspeaker of the embodiment of the invention is assumed that in a magnetic system of the annular Halbach magnetic array, a group of conducting wires which are perpendicular to magnetic lines of force in a cavity body of the magnetic system and are arranged in parallel are arranged, as shown in fig. 5. According to the left-hand rule, the heart of the left hand faces the magnetic force line, the directions of the four fingers are the current directions, and the thumb points to the stress direction of the lead, namely the lead bar is stressed in the thumb direction. If, for example, as shown in fig. 4-1 and 4-2, the magnetic field direction is parallel to the paper, so that the current direction in the wire-guide is also parallel to the paper and perpendicular to the magnetic field direction, e.g. vertically down or up on the paper, then the direction of the force applied to the wire-guide should be perpendicular to the paper, either in or out of the paper. If the conducting wire bar is connected with an audio alternating current signal, the conducting wire bar can reciprocate inwards or outwards from the paper surface in a direction perpendicular to the paper surface along with the current, and if the conducting wire bar is connected with the vibrating membrane, the vibrating membrane is driven to vibrate to produce sound.
2. Structural design of planar coil annular Halbach magnetic array loudspeaker
2.1 structural design of the magnetic System
The loudspeaker of the embodiment of the invention adopts a ring-shaped Halbach magnetic array as shown in figures 4-1 and 4-2. The magnetic array can be formed by surrounding 12 magnet units in a mode of sequentially deflecting 60 degrees in the magnetic pole direction, wherein the magnetic pole directions of two opposite magnet units at any position are the same. The annular magnet is formed by circumferentially staggering two magnetic steels, namely two annular Halbach magnetic arrays by a certain angle, so that the directions of magnetic fields formed by the two annular Halbach magnetic arrays are opposite. The magnetic lines of force of the magnetic system of the annular Halbach magnetic array are almost all in the cylindrical cavity of the magnetic system, and the external part of the magnetic system is almost zero. The manufacture and magnetization of the annular Halbach magnet array can be accomplished using known techniques, which will not be described in detail herein.
2.2 structural design of Voice coil
As shown in fig. 6, in the present embodiment, used as the voice coil are two planar coils, i.e., coil 13a and coil 13b, which are symmetrically distributed; the two coils are fixed to a lightweight (e.g. paper) cylindrical former 14, which former 14 is glued to the diaphragm. As shown in FIG. 6, two planar coils 13a and 13b are arranged in a mirror symmetry manner, one left and the other right, and are respectively and firmly fixed on the cylindrical frame 14. Then, two symmetrically distributed coils serving as voice coils are placed in an annular Halbach magnetic array magnetic field with a unidirectional inner cavity.
The two coils can be connected in parallel or in series, and in practical application, the impedance matching is needed to determine so as to match the impedance of the input end when the two coils are used. The general resistance should be in the specification of 4-8 ohms for the loudspeaker series; the receiver is required to be in a specification of 16-32 ohms. However, whether in parallel, the direction of current flow in both coils should be as indicated by the direction of the arrows shown in fig. 6.
2.3 description of the operating principle
According to the loudspeaker provided by the embodiment of the invention, the magnetic system of the loudspeaker uses the annular Halbach magnetic array with the inner cavity in a single direction, the upper and lower blocks are overlapped and glued together for use at the same time, the upper inner cavity is the magnetic field of the annular Halbach magnetic array magnet in the single direction, and the difference between the magnetic field of the annular Halbach magnetic array magnet in the single direction and the magnetic field of the annular Halbach magnetic array magnet in the single direction in the lower inner cavity is pi, namely the magnetic fields are completely opposite. The cross-sectional structure of two annular magnets which are overlapped by an upper annular Halbach magnetic array and a lower annular Halbach magnetic array and are glued together and the direction of a magnetic field in an inner cavity are shown in figure 7. The two inner cavities are annular Halbach magnetic array magnets in a single direction, the thickness of the single magnet is slightly larger than half of the height of the voice coil, and the thickness ratio of the whole magnet is larger than the height of the voice coil. In this way, it is ensured that, as shown in fig. 7: the wire harness section above the two coils is subjected to an ampere force in an upward (or downward) direction parallel to the paper surface, and the wire harness section below the two coils is also subjected to an ampere force in an upward (or downward) direction parallel to the paper surface when the wire harness section is in a magnetic field different from the wire harness section by pi.
Because the current direction of the wire harness sections DA and D 'A' above the two coils 13a and 13B is opposite to the current direction of the wire harness sections BC and B 'C' below the two coils; the direction of the magnetic field of the wire harness section above the two coils 13a and 13b is opposite to that of the magnetic field of the wire harness section below; thus, the direction of the ampere force is the same. In this way, in the magnetic field provided by the two annular Halbach magnetic arrays which are formed in the inner cavity and have single-direction magnetic fields in completely opposite directions and are glued together, the two symmetrically distributed coils 13a and 13b are positioned in the inner cavity of the annular Halbach magnetic array; the wire direction of the two symmetrically distributed coils 13a and 13b is perpendicular to the magnetic field direction; when the audio signal is applied to the lead, the lead is acted by ampere force in a magnetic field to drive the vibrating membrane connected with the framework where the two coils 13a and 13b are located to do telescopic motion, so that sound production is realized. The two vertical sides of the coil are AB and CD, the current directions are opposite, the coil is under tension or pressure, and the expansion and contraction movement of the vibration film on the framework where the two coils I and II are located does not contribute to the expansion and contraction movement of the vibration film, and the expansion and contraction movement does not need to be considered. In the manufacturing process, the voice coil is connected with the vibration basin and then is assisted with accessories such as a basin frame for fixing, and the flat coil annular Halbach magnetic array loudspeaker can be formed.
2.4 technical characteristics
(1) The magnetic system of the loudspeaker adopts the annular Halbach magnetic array, the magnetic force lines of the magnetic system are all in the cavity, and the outside is almost zero.
(1) The magnetic system of the loudspeaker is different from an internal magnetic type and an external magnetic type, does not need a magnetic conduction plate or T iron, and can achieve the purpose of concentrating magnetic lines of force in a certain area by relying on the magnetic structure of the loudspeaker without guiding the magnetic lines of force.
(3) The magnetic system of the loudspeaker of the invention adopts the annular Halbach magnetic array, and the magnetic induction intensity of the loudspeaker is improved by 1.4 times compared with that of the conventional loudspeaker, so that the sensitivity of the loudspeaker is correspondingly improved.
(4) The magnetic system of the annular Halbach magnetic array is a parallel magnetic field system instead of a radiation-shaped magnetic field system, so that the application requirement of the magnetic gauge is much lower than that of the magnetic gauge in the original loudspeaker production.
(5) The magnetic system of the annular Halbach magnetic array is a parallel magnetic field system, an annular Halbach magnetic array with a single-direction inner cavity is used, the upper and lower blocks are overlapped and glued together for use, the upper inner cavity is the magnetic field of the annular Halbach magnetic array magnet in the single direction, the magnetic field difference between the upper inner cavity and the lower inner cavity is pi, namely the magnetic fields are completely opposite, the thickness of the two inner cavities is slightly larger than half of the height of a voice coil, and therefore the wire harness sections above the two coils can be guaranteed to be subjected to the upward (or downward) direction ampere force, and the wire harness sections below the two coils I and II are also subjected to the upward (or downward) ampere force when being in the magnetic field different from the pi.
In summary, the embodiment of the invention discloses a planar coil annular Halbach magnetic array loudspeaker. The loudspeaker design adopting the annular Halbach magnetic array and the planar coil is within the protection scope of the invention; in addition to the structures disclosed above, other derivative designs for loudspeakers employing annular Halbach magnet arrays and planar coils are within the scope of the invention.
The technical solution of the present invention is explained in detail by the specific embodiments above. In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to the related descriptions of other embodiments.
It should be understood that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; the technical solutions described in the above embodiments can be modified or part of the technical features can be equivalently replaced by those skilled in the art; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the spirit and the scope of the technical solutions of the embodiments of the present invention.
Claims (6)
1. A planar coil annular Halbach magnetic array loudspeaker comprising: a diaphragm, a voice coil, and a ring magnet; the annular magnet is composed of two annular Halbach magnetic arrays which are coaxially arranged, the annular Halbach magnetic arrays form a magnetic field in a single direction in an inner cavity of the annular Halbach magnetic arrays, and the directions of the magnetic fields formed by the two annular Halbach magnetic arrays are opposite;
the voice coil loudspeaker voice coil includes the coil that the perpendicular to magnetic field direction set up, the coil is the plane coil, just the upper end and the lower extreme of coil are located two respectively in the magnetic field of cyclic annular Halbach magnetic array, the coil is used for driving the vibrating diaphragm vibration sound production.
2. The planar coil annular Halbach magnetic array loudspeaker of claim 1, wherein the coil is forced in a magnetic field to produce a telescoping motion in the direction of the axis of the annular magnet when an audio signal is applied to the coil.
3. A planar coil annular Halbach magnet array loudspeaker according to claim 2, wherein two of the voice coils are arranged and fixed in a symmetrically distributed manner on a former, the former being connected to the diaphragm.
4. A planar coil annular Halbach magnetic array loudspeaker according to claim 3, wherein the voice coil is a square or rectangular form coil and the former is a lightweight cylindrical former.
5. The planar coil annular Halbach magnet array loudspeaker of claim 1 wherein the annular Halbach magnet array is comprised of a plurality of magnet units concentrically surrounded by magnet units sequentially deflected 60 degrees in the direction of their magnetic poles.
6. The planar coil annular Halbach magnet array loudspeaker of claim 1 wherein each of the annular Halbach magnet arrays has a thickness slightly greater than half the height of the voice coil, and the thickness of the annular magnet formed by the two annular Halbach magnet arrays bonded together is greater than the height of the voice coil.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111470296.XA CN114051197A (en) | 2021-12-03 | 2021-12-03 | Planar coil ring Halbach magnetic array loudspeaker |
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| CN202111470296.XA CN114051197A (en) | 2021-12-03 | 2021-12-03 | Planar coil ring Halbach magnetic array loudspeaker |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160212546A1 (en) * | 2015-01-16 | 2016-07-21 | Apple Inc. | Halbach array audio transducer |
| US20190101604A1 (en) * | 2015-09-21 | 2019-04-04 | Universitat Zu Lubeck | Magnetic Field-Generating Device for Magnetic Particle Imaging |
| CN113079447A (en) * | 2021-04-12 | 2021-07-06 | 东莞市瑞勤电子有限公司 | Annular Halbach magnetic array loudspeaker |
| CN113099369A (en) * | 2021-03-26 | 2021-07-09 | 麦格雷博电子(深圳)有限公司 | Annular Halbach magnetic array loudspeaker |
| CN216565582U (en) * | 2021-12-03 | 2022-05-17 | 深圳市新厚泰电子科技有限公司 | Planar coil annular Halbach magnetic array loudspeaker |
-
2021
- 2021-12-03 CN CN202111470296.XA patent/CN114051197A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160212546A1 (en) * | 2015-01-16 | 2016-07-21 | Apple Inc. | Halbach array audio transducer |
| US20190101604A1 (en) * | 2015-09-21 | 2019-04-04 | Universitat Zu Lubeck | Magnetic Field-Generating Device for Magnetic Particle Imaging |
| CN113099369A (en) * | 2021-03-26 | 2021-07-09 | 麦格雷博电子(深圳)有限公司 | Annular Halbach magnetic array loudspeaker |
| CN113079447A (en) * | 2021-04-12 | 2021-07-06 | 东莞市瑞勤电子有限公司 | Annular Halbach magnetic array loudspeaker |
| CN216565582U (en) * | 2021-12-03 | 2022-05-17 | 深圳市新厚泰电子科技有限公司 | Planar coil annular Halbach magnetic array loudspeaker |
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