CN107995569B - Multi-magnetic loudspeaker driving structure and multi-magnetic loudspeaker - Google Patents
Multi-magnetic loudspeaker driving structure and multi-magnetic loudspeaker Download PDFInfo
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- CN107995569B CN107995569B CN201711401704.XA CN201711401704A CN107995569B CN 107995569 B CN107995569 B CN 107995569B CN 201711401704 A CN201711401704 A CN 201711401704A CN 107995569 B CN107995569 B CN 107995569B
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- 230000005291 magnetic effect Effects 0.000 claims abstract description 77
- 229910000831 Steel Inorganic materials 0.000 claims description 28
- 239000010959 steel Substances 0.000 claims description 28
- 239000012528 membrane Substances 0.000 claims description 15
- 230000004044 response Effects 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 6
- 230000035945 sensitivity Effects 0.000 abstract description 5
- 230000006698 induction Effects 0.000 abstract description 4
- 230000006872 improvement Effects 0.000 description 9
- 238000004458 analytical method Methods 0.000 description 8
- 230000005389 magnetism Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 230000005520 electrodynamics Effects 0.000 description 3
- 230000005236 sound signal Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 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
- H04R9/04—Construction, mounting, or centering of coil
- H04R9/045—Mounting
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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
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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
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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 relates to a multi-magnetic loudspeaker driving structure and a multi-magnetic loudspeaker, comprising: the magnets and the voice coils are arranged in a central symmetry mode, gaps are reserved between the adjacent magnets, and the voice coils are arranged between the gaps between the magnets. According to the multi-magnetic loudspeaker driving structure and the loudspeaker, through the design of the multi-magnetic structure, on the basis of ensuring the tiny volume of the loudspeaker, the voice coil can fully utilize the superposition effect of multiple magnetic fields, the induction sensitivity to audio current signals is improved, a wider audio frequency and sound intensity response range is achieved, and high-fidelity audio frequency restoration is realized.
Description
Technical Field
The present invention relates to the field of speaker technologies, and in particular, to a multi-magnetic speaker driving structure and a multi-magnetic speaker.
Background
Speakers are of many kinds, but the basic principle of operation is similar, and are devices for converting an electrical signal into a sound signal for reproduction. The most widely used loudspeakers at present are electrodynamic loudspeakers, which consist of components such as a sound membrane, a voice coil, a permanent magnet, a bracket and the like.
The working principle of the electrodynamic loudspeaker is that after the voice coil of the loudspeaker is electrified with an audio current signal, the voice coil generates an alternating magnetic field under the action of current, and the permanent magnet also generates a constant magnetic field with unchanged size and direction. The size and direction of the magnetic field generated by the voice coil are continuously changed along with the change of the audio current signal, so that the interaction of the two magnetic fields enables the voice coil to continuously move, and the voice coil is connected with the sound membrane so as to drive the sound membrane to vibrate, and the sound membrane vibrates to cause air vibration to generate corresponding sound. When the current input to the voice coil is larger or the magnetic field provided by the permanent magnet is larger, the acting force of the magnetic field applied to the voice coil is larger, the sensitivity and the amplitude which can be achieved by the sound film vibration are larger, the sound reduction degree is higher, and the audio frequency range is wider. However, the current level is often determined by the loudness of the music, and when the current level is in the bass range, the current level is correspondingly reduced, and the problem of maintaining the sensitivity of voice coil induction is an urgent problem to be solved under the condition of low current level.
The voice coil response sensitivity can be improved by enhancing the magnetic field of the permanent magnet, the voice film induction voice frequency and the voice strength range are wider, and the high-fidelity voice frequency restoration can be realized, but the strength of the magnetic field to be enhanced can be realized by stacking the permanent magnets, the effective utilization of the magnetic field of the permanent magnet can be realized by designing a structure of mutually matching the magnet and the voice coil without mutual interference, the volume of the loudspeaker is considered, the existing electrodynamic loudspeaker uses a single magnetic circuit or a double magnetic circuit, the discharge structure of the permanent magnet and the voice coil can not meet the requirement of a user on high-fidelity music, and therefore, the need is urgent to provide a miniature loudspeaker driving structure with high magnetic field strength to meet the requirement of the user.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides a multi-magnetic loudspeaker driving structure and a multi-magnetic loudspeaker, ensures the voice coil to fully utilize the superposition effect of multiple magnetic fields on the basis of ensuring the tiny volume of the loudspeaker through the design of the multi-magnetic structure, improves the induction sensitivity to audio current signals, achieves wider audio and sound intensity response range and realizes high-fidelity audio restoration.
In order to solve the technical problems, the invention adopts the following technical measures:
in a first aspect, a multi-magnetic speaker driving structure includes: a plurality of magnets, voice coils; the magnets are arranged in a central symmetry mode, gaps are reserved between the adjacent magnets, and the voice coil is installed between the gaps between the magnets.
As a further improvement, the magnet includes: the voice coil is arranged between the gaps among the pole cores.
As a further improvement, the shape of the magnetic steel is square, and a plurality of the magnetic steels are symmetrically arranged into a square.
As a further improvement, the number of the magnetic steels is 4, and the shape of the gap between the magnetic steels is cross-shaped.
As a further improvement, the shape of the voice coil is a cross shape, and the voice coil includes: the first part, the second part, the third part and the fourth part, the first part with the third part is symmetrical, the second part with the fourth part is symmetrical, the head end of first part is connected with one pole of power, the head end of third part is connected with another pole of power.
As a further improvement, the two sides of the first part, the second part, the third part and the fourth part are in compact fit.
As a further improvement, the polarities of the two pole cores corresponding to the second part are N, and the polarities of the two pole cores corresponding to the fourth part are S.
As a still further improvement, the voice coil includes: the first voice coil and the second voice coil are both in a right angle shape, and are arranged in a cross shape;
The first voice coil includes: fifth part and sixth part, fifth part head end is connected with the positive pole of power, sixth part head end is connected with the power one pole, the second voice coil includes: the head end of the seventh part is connected with a power supply anode, and the head end of the eighth part is connected with a power supply cathode; and two sides of the fifth part, the sixth part, the seventh part and the eighth part are compactly jointed.
As still further improvement, the polarities of the pole pieces corresponding to the fifth portion and the sixth portion are N, the polarities of the pole pieces corresponding to the fifth portion and the eighth portion are S, the polarities of the pole pieces corresponding to the sixth portion and the seventh portion are S, and the polarities of the pole pieces corresponding to the seventh portion and the eighth portion are N.
In a second aspect, the present invention also provides a multi-magnetic speaker using a multi-magnetic speaker driving structure, comprising: the magnetic steel one end is fixed at the bottom end of the magnetic bowl, the pole core is attached to the other end of the magnetic steel, the voice coil is connected with the sound membrane, the sound membrane is covered at the top end of the magnetic bowl, the upper cover is buckled at the top end of the magnetic bowl, and the upper cover is hollowed in the middle, so that the sound membrane is exposed.
Compared with the prior art, the invention has the following advantages:
1. According to the invention, through the driving structure that the voice coil is arranged in the gaps among the plurality of magnets, the single or double magnetic field effect from a single or double permanent magnet to a magnetic bowl at present is changed into the multiple magnetic effect from the magnet to the magnet, a stronger magnetic field is provided on the premise of tiny volume, and compared with the prior art, a wider audio frequency and sound intensity response range can be achieved under tiny volume, and high-fidelity audio frequency reduction is realized.
Drawings
FIG. 1 is a block diagram of a first voice coil provided in an embodiment of the present invention;
FIG. 2 is a top view of a first multi-magnet speaker driving structure according to an embodiment of the present invention;
FIG. 3 is a side view of a first multi-magnet speaker driving structure according to an embodiment of the present invention
FIG. 4 is a force analysis diagram of a first multi-magnet speaker driving structure according to an embodiment of the present invention;
FIG. 5 is a block diagram of a second voice coil according to an embodiment of the present invention;
FIG. 6 is a top view of a second multi-magnet speaker driving configuration according to an embodiment of the present invention;
FIG. 7 is a side view block diagram of a second multi-magnet speaker driving configuration provided in accordance with an embodiment of the present invention;
Fig. 8 is a force analysis diagram of a second multi-magnetic speaker driving structure according to an embodiment of the present invention.
Icon: 10-magnet; void-100; 101-pole pieces; 102-magnetic steel; 11-a voice coil; 111-a first part; 112-a second portion 113-a third portion; 114-fourth part; 12-a first voice coil; 121-fifth part; 122-sixth section; 13-a second voice coil; 131-seventh part; 132-eighth section.
Detailed Description
To make the objects, technical solutions and advantages of this patent more apparent, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and the present invention will be further described in detail with reference to the accompanying drawings and detailed description.
First embodiment:
Referring to fig. 1, fig. 2 and fig. 3, the present invention provides a multi-magnetic speaker driving structure, comprising: the magnets 10 and the voice coil 11 are arranged in a central symmetry manner, gaps 100 are reserved between the adjacent magnets 10, and the voice coil 11 is installed between the gaps 100 between the magnets 10. The magnet is composed of a pole core 101 and magnetic steel 102, wherein the pole core 101 is attached to one end of the magnetic steel 102, the pole core 101 is magnetized by the magnetic steel 102, and then magnetic flux gaps are formed between the pole cores 101. The voice coil 11 is installed in the gap between the pole cores 101, ensuring that the voice coil 11 can obtain magnetic flux between the pole cores 101. Specifically, the shape of the magnetic steel 102 is square, and a plurality of the magnetic steels 102 are symmetrically arranged in a square shape. In the present embodiment, the number of the magnetic steels 102 is preferably 4, and the shape of the gap 100 between the magnetic steels 102 is preferably a cross.
Accordingly, the voice coil 11 installed in the gap 100 has a cross shape, and as the name implies, the voice coil 11 has a single coil, and the coil has a cross shape. It will be appreciated that the cross-shaped voice coil 11 is actually two sided in each of the four directions so as to form a single loop. In the present embodiment, the four directions of the cross-shaped voice coil 11 correspond to: a first portion 111, a second portion 112, a third portion 113, and a fourth portion 114. Wherein the two sides of the first portion 111, the second portion 112, the third portion 113 and the fourth portion 114 are compactly fitted.
Referring to fig. 4, the polarities of the two pole pieces 101 corresponding to the second portion 112 are N, and the polarities of the two pole pieces 101 corresponding to the fourth portion 114 are S. The first portion 111 and the third portion 113 are symmetrical, and the second portion 112 and the fourth portion 114 are symmetrical.
It should be understood that, according to the polarity of the pole core 101 and the difference of the current flow direction in the voice coil 11, the stress condition of the voice coil 11 will change correspondingly, and the present invention provides several pole core 101 polarity arrangement modes, and the control of the stress direction of the voice coil 11 can be realized according to the difference of the current flow direction on the basis of the pole core 101 polarity arrangement mode, which is further understood with reference to the following stress analysis.
Analysis of stress conditions provided in this embodiment:
When the polarity of one pole of the power source connected to the head end of the first portion 111 is positive and the polarity of the other pole of the power source connected to the head end of the third portion 113 is negative, a current is generated from the first portion 111 to the third portion 113, and the arrow direction in the voice coil 11 in fig. 4 indicates the conducting direction of the current, and the arrow passing through each portion of the voice coil 11 in fig. 4 indicates the magnetic field direction.
When energized, current in voice coil 11 flows from the head end of first portion 111 to the head end of third portion 113 through the two parallel branches. A magnetic field in the direction from the N pole to the S pole is correspondingly formed between the pole core 101 with the polarity of N and the pole core 101 with the polarity of S; a magnetic field pointing outwards from the N pole is formed between the two pole pieces 101 with the polarity N, and a magnetic field pointing outwards from the S pole is formed between the two pole pieces 101 with the polarity S. By combining the current direction and the magnetic field direction in fig. 4, and according to the physical rule of lorentz force direction judgment, namely the "left hand rule", the stress directions of the first part 111, the second part 112, the third part 113 and the fourth part 114 can be judged to be the directions pointed outwards from the plane, so that the driving effect of four superimposed magnetic fields on the voice coil 11 in the upward direction is realized.
Analysis of another stress situation provided by this embodiment:
the polarity of one pole of the power source connected to the head end of the first portion 111 is negative, and the polarity of the other pole of the power source connected to the head end of the third portion 113 is positive, so that a current is generated from the third portion 113 to the third portion 111, and referring to the opposite direction of the current direction in fig. 4, the arrows passing through the respective portions of the voice coil 11 in fig. 4 indicate the magnetic field direction.
When energized, current in voice coil 11 flows from the head end of third portion 113 to the head end of first portion 111 through the two parallel branches. A magnetic field in the direction from the N pole to the S pole is correspondingly formed between the pole core 101 with the polarity of N and the pole core 101 with the polarity of S; a magnetic field pointing outwards from the N pole is formed between the two pole pieces 101 with the polarity N, and a magnetic field pointing outwards from the S pole is formed between the two pole pieces 101 with the polarity S. According to the physical rule of lorentz force direction determination, namely the "left hand rule", referring to the opposite direction of the current direction and the magnetic field direction in fig. 4, it can be determined that the stress directions of the first portion 111, the second portion 112, the third portion 113, and the fourth portion 114 are all directions pointing in from the plane inwards, so that the driving effect of the four superimposed magnetic fields on the voice coil 11 in the "downward" direction is realized.
The two stress situation analyses show that the control method for the vibration direction of the voice coil 11 is embodied, namely, the control of the vibration direction of the voice coil 11 can be realized by controlling the direction of the current, and meanwhile, the control of the vibration amplitude of the voice coil 11 can be realized according to the magnitude of the current, so that the voice coil 11 can vibrate according to the audio current signal, and the voice coil 11 drives the sound film to vibrate so as to drive air to vibrate, thereby restoring the sound signal.
In summary, the coil 11 obtains a magnetic field strength in the same area of the pole piece 101 that is several times that of the conventional speaker driving structure. Therefore, under the condition that the current is the same, the intensity of the magnetic field driving force obtained by the voice coil 11 is high, and under the condition that the current intensity is weak and the current frequency is low, the response current signal driving can still be ensured, the wider audio frequency and sound intensity response range is achieved, and the high-fidelity audio frequency reduction is realized.
Second embodiment:
Referring to fig. 5, 6 and 7, the present invention further provides a multi-magnetic speaker driving structure, wherein the shape of the magnetic steel 102 is square, a plurality of magnetic steels 102 are symmetrically arranged into square, the number of the magnetic steels 102 is 4, the shape of the gap 100 between the magnetic steels 102 is cross, and the voice coil comprises: the first voice coil 12 and the second voice coil 13, the first voice coil 12 and the second voice coil 13 are all in a right angle shape, and the first voice coil 12 and the second voice coil 13 are arranged in a cross shape;
The first voice coil 12 includes: fifth portion 121 and sixth portion 122; the second voice coil 13 includes: a seventh portion 131 and an eighth portion 132. The sides of the fifth portion 121, the sixth portion 122, the seventh portion 131 and the eighth portion 132 are also compactly fitted. The polarity of the pole piece 101 corresponding to the fifth portion 121 and the sixth portion 122 is N, the polarity of the pole piece 101 corresponding to the fifth portion 121 and the eighth portion 132 is S, the polarity of the pole piece 101 corresponding to the sixth portion 122 and the seventh portion 132 is S, and the polarity of the pole piece 101 corresponding to the seventh portion 131 and the eighth portion 132 is N.
Referring to fig. 8, the present embodiment provides an analysis of stress conditions:
When the polarity of the first pole of the power source connected to the head end of the fifth portion 121 is positive and the polarity of the first pole of the power source connected to the head end of the sixth portion 122 is negative, a current is generated from the fifth portion 121 to the sixth portion 122, and the direction of the arrow in the first voice coil 12 in fig. 8 is referred to as the conducting direction of the current, and the arrow passing through each portion of the first voice coil 12 in fig. 8 is referred to as the magnetic field direction.
When energized, current in the first voice coil 12 flows from the head end of the fifth section 121 to the head end of the sixth section 122 through two parallel branches. A magnetic field in the direction from the N pole to the S pole is correspondingly formed between the pole core 101 with the polarity of N and the pole core 101 with the polarity of S; in combination with the current direction and the magnetic field direction in fig. 8, according to the physical rule of lorentz force direction determination—the "left hand rule", it can be determined that the force directions of the fifth portion 121 and the sixth portion 122 are both directions pointed out from the plane, and the magnetic field acts on the driving action of the first voice coil 12 "up".
When the polarity of the first pole of the power source connected to the head end of the seventh portion 131 is positive and the polarity of the first pole of the power source connected to the head end of the eighth portion 132 is negative, a current is generated from the seventh portion 131 to the eighth portion 132, and the direction of the arrow in the second voice coil 13 in fig. 8 is referred to as the conduction direction of the current, and the arrow passing through each portion of the second voice coil 13 in fig. 8 is referred to as the magnetic field direction.
When energized, current in the second voice coil 13 flows from the head end of the seventh portion 131 to the head end of the eighth portion 132 through two parallel branches. A magnetic field in the direction from the N pole to the S pole is correspondingly formed between the pole core 101 with the polarity of N and the pole core 101 with the polarity of S; in combination with the current direction and the magnetic field direction in fig. 8, according to the physical rule of lorentz force direction determination—the "left hand rule", it can be determined that the force direction of the seventh portion 131 and the eighth portion 132 is the direction pointed out from the plane, and the magnetic field acts on the driving action of the second voice coil 13 "upward".
Similarly, it can be pushed that when the polarity of the first pole of the power source connected to the head end of the fifth portion 121 is negative, and the polarity of the first pole of the power source connected to the head end of the sixth portion 122 is positive, the magnetic field will generate a "downward" driving effect on the first voice coil 12; when the polarity of the first pole of the power source connected to the head end of the seventh portion 131 is negative, and the polarity of the first pole of the power source connected to the head end of the eighth portion 132 is positive, the magnetic field will exert a "downward" driving effect on the second voice coil 13.
The analysis of the two stress conditions shows that the control method for the vibration directions of the first voice coil 12 and the second voice coil 13 is realized, namely, the control of the vibration directions of the first voice coil 12 and the second voice coil 13 can be realized by controlling the current directions, and meanwhile, the control of the vibration amplitude of the first voice coil 12 and the second voice coil 13 can be realized according to the current magnitude, so that the first voice coil 12 and the second voice coil 13 can realize the vibration according to the audio current signals, and the voice coils of the first voice coil 12 and the second voice coil 13 drive the sound films to vibrate so as to drive the air to vibrate, thereby restoring the sound signals.
With the above structure, the driving action of the four magnetic fields on the first voice coil 12 and the second voice coil 13 is achieved. Therefore, under the condition that the current is the same, the strength of the magnetic field driving force obtained by the first voice coil 12 and the second voice coil 13 is high, and under the condition that the current strength is weak and the current frequency is low, the response current signal driving can still be ensured to be obtained, the wider audio frequency and sound intensity response range is achieved, and the high-fidelity audio frequency reduction is realized.
Third embodiment:
The present invention provides a multi-magnetic speaker, comprising: the utility model provides a many magnetism formula speaker drive structure to and magnetism bowl, sound membrane and upper cover, magnetism bowl are used for the fixed part of placing many magnetism formula speaker, and magnet steel one end is fixed in magnetism bowl bottom, and the magnet steel other end posts has the polar core, and the voice coil loudspeaker voice coil is connected with the sound membrane, and the sound membrane covers on magnetism bowl top, and the upper cover lock is at the top of magnetism bowl, and the upper cover is middle fretwork for the sound membrane exposes.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather to enable any modification, equivalent replacement, improvement or the like to be made within the spirit and principles of the invention.
Claims (3)
1. A multi-magnetic speaker driving structure, comprising: a plurality of magnets and voice coils; wherein, a plurality of magnets are arranged in a central symmetry way, gaps are reserved between adjacent magnets, and the voice coil is arranged between the gaps between the magnets;
The magnet includes: the pole core is attached to one end of the magnetic steel, and the voice coil is arranged between the gaps among the pole cores; the number of the magnetic steels is 4, and the shape of the gap between the magnetic steels is cross-shaped;
The quantity of voice coil is one, the shape of voice coil is cross, and cross type voice coil includes: the first part, the second part, the third part and the fourth part are symmetrical, the second part and the fourth part are symmetrical, the head end of the first part is connected with one pole of a power supply, and the head end of the third part is connected with the other pole of the power supply; the cross-shaped voice coil comprises two sides in four directions respectively, and the two sides of the first part, the second part, the third part and the fourth part are compactly attached; the polarities of the two pole cores corresponding to the second part are N, and the polarities of the two pole cores corresponding to the fourth part are S.
2. A multi-magnetic speaker driving structure, comprising: a plurality of magnets and voice coils; wherein, a plurality of magnets are arranged in a central symmetry way, gaps are reserved between adjacent magnets, and the voice coil is arranged between the gaps between the magnets;
The magnet includes: the pole core is attached to one end of the magnetic steel, and the voice coil is arranged between the gaps among the pole cores; the number of the magnetic steels is 4, and the shape of the gap between the magnetic steels is cross-shaped;
the number of voice coils is two, the voice coil includes: the first voice coil and the second voice coil are both in a right angle shape, and are arranged in a cross shape;
The first voice coil includes: fifth part and sixth part, fifth part head end is connected with the positive pole of power, sixth part head end is connected with the power negative pole, the second voice coil includes: the head end of the seventh part is connected with a power supply one pole, and the head end of the eighth part is connected with the power supply one pole; the two sides of the fifth part, the sixth part, the seventh part and the eighth part are tightly jointed;
The polarities of the pole pieces corresponding to the fifth portion and the sixth portion are N, the polarities of the pole pieces corresponding to the fifth portion and the eighth portion are S, the polarities of the pole pieces corresponding to the sixth portion and the seventh portion are S, and the polarities of the pole pieces corresponding to the seventh portion and the eighth portion are N.
3. A multi-magnet speaker, comprising: the multi-magnetic speaker driving structure according to any one of claims 1 to 2, a magnetic bowl, a sound membrane and an upper cover, wherein one end of the magnetic steel is fixed at the bottom end of the magnetic bowl, the other end of the magnetic steel is stuck with the pole core, the voice coil is connected with the sound membrane, the sound membrane is covered at the top end of the magnetic bowl, the upper cover is buckled at the top end of the magnetic bowl, and the upper cover is hollowed in the middle, so that the sound membrane is exposed.
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| CN201711401704.XA CN107995569B (en) | 2017-12-22 | 2017-12-22 | Multi-magnetic loudspeaker driving structure and multi-magnetic loudspeaker |
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| CN201711401704.XA CN107995569B (en) | 2017-12-22 | 2017-12-22 | Multi-magnetic loudspeaker driving structure and multi-magnetic loudspeaker |
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| CN107995569B true CN107995569B (en) | 2024-06-07 |
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| US9130445B1 (en) * | 2014-08-04 | 2015-09-08 | David Micah Katz | Electromechanical transducer with non-circular voice coil |
| CN205647987U (en) * | 2016-04-27 | 2016-10-12 | 江苏普多泽安全技术有限公司 | Utilize magnetic circuit of special -shaped magnet and contain this magnetic circuit's speaker |
| CN206533527U (en) * | 2017-03-16 | 2017-09-29 | 深圳精拓创新科技有限公司 | Surround sound loudspeaker unit |
| CN207910998U (en) * | 2017-12-22 | 2018-09-25 | 厦门东声电子有限公司 | A kind of more magnetic loudspeaker driving structures and more magnetic loudspeakers |
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| CN107995569A (en) | 2018-05-04 |
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