Voice coil driving device and loudspeaker

Abstract

The utility model provides a voice coil driving device and a loudspeaker, and relates to the technical field of loudspeakers. The voice coil driving device comprises a magnetic circuit structure with a magnetic gap; and the voice coil assembly is suspended in the magnetic gap and comprises a plurality of voice coils which are arranged along the advancing shaft and connected in sequence, and the plurality of voice coils move along the advancing shaft under the action of a driving signal.

Description

Technical Field

[0001] The present application relates to the technical field of loudspeakers, and in particular to a voice coil driving device and a loudspeaker. Background Art

[0002] Currently, micro speakers have a problem of large distortion when they are driven by high-power signals to produce large amplitudes, resulting in poor sound quality.

[0003] In the prior art, a symmetrical suspension system is added to increase the stiffness of the support to reduce the distortion caused by uneven force. However, the symmetrical suspension system occupies the magnet space and requires the use of higher performance magnets, which increases the cost a lot.

[0004] Therefore, how to provide a method to improve the sound quality without increasing the cost becomes an urgent problem to be solved. Utility Model Content

[0005] The purpose of the embodiments of the present application is to provide a voice coil driving device and a loudspeaker.

[0006] In order to solve the above technical problems, the embodiments of the present application provide the following technical solutions:

[0007] A first aspect of the present application provides a voice coil driving device, comprising:

[0008] A magnetic circuit structure having a magnetic gap;

[0009] A voice coil assembly is suspended in the magnetic gap, wherein the voice coil assembly comprises a plurality of voice coils arranged along a travel axis and connected in sequence, and the plurality of voice coils move along the travel axis under the action of a driving signal.

[0010] In some modified implementations of the first aspect of the present application, a portion of each voice coil is connected to a portion of an adjacent voice coil in a stacked manner along the travel axis.

[0011] In some modified implementations of the first aspect of the present application, the plurality of voice coils are driven one by one by the driving signal.

[0012] In some modified implementations of the first aspect of the present application, the drive signal is configured to drive the voice coil to move to a target position in the magnetic gap.

[0013] In some modified implementations of the first aspect of the present application, a dimension of the winding of each voice coil in the direction of the travel axis is smaller than a dimension of a target position in the magnetic gap in the direction of the travel axis.

[0014] In some modified implementations of the first aspect of the present application, the magnetic circuit structure having a magnetic gap includes:

[0015] The paired magnetic members are spaced apart along a first direction, forming the magnetic gap at the spaced apart positions, and the first direction and the traveling axis direction meet a perpendicular condition;

[0016] The paired magnetic members include a first magnetic member and a second magnetic member, wherein:

[0017] The first magnetic member and the second magnetic member are both magnets, or

[0018] The first magnetic component is a magnet, and the second magnetic component is a magnetic conductor.

[0019] In some modified implementations of the first aspect of the present application, both the first magnetic member and the second magnetic member are magnets.

[0020] The first magnetic member and the second magnetic member are provided with magnetic conductors on both sides along the travel axis direction, and the corresponding positions of the magnetic conductors are the target positions in the magnetic gap.

[0021] In some modified implementations of the first aspect of the present application, the first magnetic member is a columnar structure, the second magnetic member is an annular structure, and the second magnetic member is located on the peripheral side of the first magnetic member.

[0022] A second aspect of the present application provides a loudspeaker, comprising a diaphragm; and

[0023] According to the voice coil driving device as described above, the diaphragm is connected to the voice coil assembly and is pulled by the voice coil assembly to move along the travel axis.

[0024] In some modified implementations of the second aspect of the present application, the following also includes:

[0025] A limiting member has one end connected to a fixed position and the other end elastically connected to the diaphragm, and the limiting member is used to limit the movement of the diaphragm in the non-travel axis direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] By reading the detailed description below with reference to the accompanying drawings, the above and other purposes, features and advantages of the exemplary embodiments of the present application will become easy to understand. In the accompanying drawings, several embodiments of the present application are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0027] Figure 1 A partial structural diagram of a speaker provided by the present application is schematically shown;

[0028] Description of Figure Numbers:

[0029] The loudspeaker 1 includes a magnetic circuit structure 11 , a magnetic gap 111 , a first magnetic member 112 , a second magnetic member 113 , a magnetic conductor 114 , a voice coil assembly 12 , a voice coil 121 , a diaphragm 13 , a limiting member 14 , and a fixing portion 15 . DETAILED DESCRIPTION

[0030] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0031] like Figure 1 As shown, the present application provides a voice coil 121 driving device, comprising:

[0032] A magnetic circuit structure 11 having a magnetic gap 111;

[0033] The voice coil assembly 12 is suspended in the magnetic gap 111 , and the voice coil assembly 12 includes a plurality of voice coils 121 arranged along the travel axis and connected in sequence, and the plurality of voice coils 121 move along the travel axis under the action of a driving signal.

[0034] An embodiment of the present application provides a voice coil 121 driving device, which includes a magnetic circuit structure 11 and a voice coil assembly 12. The magnetic circuit structure 11 has a magnetic gap 111. The voice coil assembly 12 is suspended in the magnetic gap 111 formed by the magnetic circuit structure 11. The voice coil assembly 12 includes a plurality of voice coils 121. The plurality of voice coils 121 move along the direction of the traveling axis under the action of a driving signal. The plurality of voice coils 121 are connected in sequence along the direction of the traveling axis, wherein the direction of the traveling axis is parallel to the extension direction of the magnetic gap 111. Furthermore, the plurality of voice coils 121 are suspended in the magnetic gap 111, so that in the process of the plurality of voice coils 121 moving along the travel axis, since the length of each single voice coil 121 included in the plurality of voice coils 121 is relatively short, the Ampere force on the voice coil 121 in the left-right direction is very small, so the left-right swaying on the single voice coil 121 is very small, so that the left-right swaying amplitude on the diaphragm 13 connected to the voice coil 121 is also very small, thereby reducing distortion and improving sound quality, and there is no need to increase the rigidity of the support by adding a symmetrical suspension system in order to reduce swaying as in the prior art, so that a higher-performance magnet will not be used due to occupying space, and thus there is no need to increase costs. Therefore, the voice coil 121 driving device provided in the present application improves the sound quality without increasing costs.

[0035] like Figure 1 As shown, in the embodiment of the present application, a portion of each voice coil 121 is connected to a portion of an adjacent voice coil 121 in a stacked manner along the travel axis.

[0036] In this embodiment, the voice coil assembly 12 includes a plurality of voice coils 121 and a fixed rod, one end of the fixed rod is fixed, and the other end is suspended in the magnetic gap 111, and the plurality of voice coils 121 are arranged on the fixed rod along the direction of the travel axis, and a part of each voice coil 121 is stacked and connected with a part of an adjacent voice coil 121 along the travel axis, that is, every two adjacent voice coils 121 in the plurality of voice coils 121 are partially overlapped, so that when the driving signal received by the previous voice coil 121 stops, the next voice coil 121 can be immediately affected by the driving signal, thereby avoiding the interval of the driving signal received by the voice coil assembly 12, so that the force on the voice coil assembly 12 is continuous, and the problem of poor sound quality caused by the intermittent force on the voice coil 121 is avoided.

[0037] In the embodiment of the present application, the plurality of voice coils 121 are driven one by one by the driving signal.

[0038] In this embodiment, the voice coil assembly 12 includes a plurality of voice coils 121 extending along the travel axis direction, and the travel axis direction is parallel to the extension direction of the magnetic gap 111, so that the plurality of voice coils 121 in the voice coil assembly 12 are sequentially driven by the driving signal along the travel axis direction, and after the voice coils 121 are driven by the driving signal, they are moved along the travel axis direction by the Ampere force. The plurality of voice coils 121 are driven one by one along the travel axis direction by the driving signal, so that after a certain voice coil 121 is driven by the driving signal, it drives the voice coil assembly 12 to move along the travel axis direction, and when the voice coil 121 is no longer driven by the driving signal, another voice coil 121 adjacent thereto is driven by the driving signal, and thus continues to drive the voice coil assembly 12 to move along the travel axis direction by the Ampere force, and after the plurality of voice coils 121 are sequentially driven by the driving signal, sound is emitted.

[0039] like Figure 1 As shown, in the embodiment of the present application, the driving signal is configured to drive the voice coil 121 to move to a target position in the magnetic gap 111 .

[0040] In this embodiment, the voice coil assembly 12 includes a plurality of voice coils 121, and the plurality of voice coils 121 are sequentially connected along the traveling axis direction, and the plurality of voice coils 121 are suspended in the magnetic gap 111. When a certain voice coil 121 moves along the traveling axis direction to a target position in the magnetic gap 111, the target position of the magnetic gap 111 is a position where the magnetic flux is most dense. The voice coil 121 is driven by a driving signal, and thus is acted upon by the Ampere force, so that the voice coil 121 can move along the traveling axis direction. The plurality of voice coils 121 are sequentially arranged along the traveling axis direction, so that the plurality of voice coils 121 sequentially enter the target position in the magnetic gap 111, and the plurality of voice coils 121 sequentially move along the traveling axis under the action of the driving signal. Since the length of a single voice coil 121 is relatively short, the Ampere force applied to the voice coil 121 in the left and right directions is very small when the voice coil 121 enters the target position in the magnetic gap 111. Therefore, the left and right swinging of the single voice coil 121 is very small, thereby causing the left and right swinging amplitude of the diaphragm 13 connected to the voice coil 121 to be also very small, thereby reducing distortion and improving sound quality.

[0041] like Figure 1 As shown, in the embodiment of the present application, the size of the winding of each voice coil 121 in the direction of the travel axis is smaller than the size of the target position in the magnetic gap 111 in the direction of the travel axis.

[0042] In this embodiment, the magnetic circuit structure 11 has a magnetic gap 111, and a plurality of voice coils 121 are suspended in the magnetic gap 111. Each voice coil 121 has a winding. When the voice coil 121 passes through the band, the winding of the voice coil 121 is subjected to the Ampere force along the traveling axis under the action of the magnetic gap 111. The magnetic flux at the target position in the magnetic gap 111 is the most dense, and the magnetic force generated is the largest. The Ampere force exerted on the voice coil 121 at the target position of the magnetic gap 111 is the largest and most uniform, while the Ampere force exerted on other positions is small. The size of the winding of each voice coil 121 in the direction of the travel axis is smaller than the size of the target position in the magnetic gap 111 in the direction of the travel axis, so that the winding of each voice coil 121 is in the target position in the magnetic gap 111, so that the Ampere force along the direction of the travel axis received by each voice coil 121 is the largest and most uniform, and will not be received by the Ampere force outside the target position, thereby avoiding the voice coil 121 from being subjected to uneven left-right Ampere force at a non-target position, thereby avoiding left-right shaking. Therefore, in the voice coil 121 driving device provided by the present application, the Ampere force received by each voice coil 121 in the left-right direction is very small, so the left-right shaking received by a single voice coil 121 is very small, thereby driving the left-right shaking amplitude of the diaphragm 13 connected to the voice coil 121 to be also very small, thereby reducing distortion and improving sound quality.

[0043] like Figure 1 As shown, in the embodiment of the present application, the magnetic circuit structure 11 having a magnetic gap 111 includes:

[0044] The paired magnetic members are spaced apart along a first direction, forming the magnetic gap 111 at the spaced apart positions, and the first direction and the traveling axis direction meet a perpendicular condition;

[0045] The paired magnetic members include a first magnetic member 112 and a second magnetic member 113, wherein:

[0046] The first magnetic member 112 and the second magnetic member 113 are both magnets, or

[0047] The first magnetic component 112 is a magnet, and the second magnetic component 113 is a magnetic conductor.

[0048] In this embodiment, the magnetic circuit structure 11 includes magnetic members arranged in pairs, and the magnetic members arranged in pairs include a first magnetic member 112 and a second magnetic member 113. The first magnetic member 112 and the second magnetic member 113 are arranged at intervals, and the interval area forms a magnetic gap 111. The first magnetic member 112 and the second magnetic member 113 are arranged along a first direction, and the first direction is arranged perpendicular to the direction of the travel axis. The direction of the magnetic gap 111 is parallel to the direction of the travel axis. A plurality of voice coils 121 are suspended in the magnetic gap 111. When a voice coil 121 is located at a target position in the magnetic gap 111, the voice coil 121 is energized. At this time, magnetic lines of force are formed in the magnetic gap 111 between the first magnetic member 112 and the second magnetic member 113. Since only the voice coil 121 located at the target position in the magnetic gap 111 is energized, magnetic lines of force are also only generated at the target position. The direction of the magnetic lines of force is the first direction. Under the action of the magnetic lines of force, the The voice coil 121 is subjected to the Ampere force parallel to the direction of the travel axis, so that it moves along the direction of the travel axis, and drives the diaphragm 13 and other voice coils 121 connected to the voice coil 121 to move along the direction of the travel axis, so that the voice coil 121 originally in the target position of the magnetic gap 111 moves away from the magnetic gap 111, and the other voice coils 121 enter the magnetic gap 111. At this time, the original voice coil 121 is no longer energized, and the other voice coils 121 that have entered the magnetic gap 111 are energized, so that the magnetic lines of force will only be formed along the first direction, and the magnetic force generated will also only be along the first direction, so that the voice coil 121 will only be subjected to the Ampere force along the direction of the travel axis, and the Ampere force applied to each voice coil 121 in the left and right directions is very small, so that the diaphragm 13 will not vibrate due to uneven force in the left and right directions, thereby avoiding the problem of poor sound quality caused by the vibration of the diaphragm 13, improving the sound quality, and not increasing the cost.

[0049] In this embodiment, the first magnetic member 112 and the second magnetic member 113 may both be magnets; or, the first magnetic member 112 is a magnet and the second magnetic member 113 is a magnetic conductor. In both cases, a magnetic gap 111 is formed between the first magnetic member 112 and the second magnetic member 113, and multiple voice coils 121 are along the direction of the travel axis.

[0050] In the embodiment of the present application, the first magnetic member 112 and the second magnetic member 113 are both magnets.

[0051] Magnetic conductors 114 are provided on both sides of the first magnetic member 112 and the second magnetic member 113 along the direction of the travel axis, and the corresponding positions of the magnetic conductors 114 are the target positions in the magnetic gap 111 .

[0052] In this embodiment, when the first magnetic member 112 and the second magnetic member 113 are both magnets, magnets 114 are provided on both sides of the first magnetic member 112 along the direction of the travel axis, and magnets 114 are also provided on both sides of the second magnetic member 113 along the direction of the travel axis, a target position of a magnetic gap 111 is formed between the magnets 114 on the side of the first magnetic member 112 close to the diaphragm 13 and the magnets 114 on the side of the second magnetic member 113 close to the diaphragm 13, and a magnetic gap 111 is formed between the magnets 114 on the side of the first magnetic member 112 away from the diaphragm 13 and the magnets 114 on the side of the second magnetic member 113 away from the diaphragm 13, and the magnets 114 on the side of the first magnetic member 112 away from the diaphragm 13 and the magnets 114 on the side of the second magnetic member 113 away from the diaphragm 13 can also be connected. When the voice coil 121 enters the target position of the magnetic gap 111, the voice coil 121 is affected by the driving signal, and thus the Ampere force drives the diaphragm 13 to move along the direction of the travel axis, while the Ampere force in the left and right directions is small, that is, the left and right shaking amplitude of the voice coil 121 and the diaphragm 13 is also small, thereby reducing distortion and improving sound quality.

[0053] like Figure 1 As shown, in the embodiment of the present application, the first magnetic member 112 is a columnar structure, the second magnetic member 113 is an annular structure, and the second magnetic member 113 is located on the peripheral side of the first magnetic member 112 .

[0054] In this embodiment, the first magnetic member 112 is a columnar structure, and the second magnetic member 113 is an annular structure surrounding the first magnetic member 112, that is, the second magnetic member 113 is sleeved inside the first magnetic member 112, and the first magnetic member 112 and the second magnetic member 113 are arranged at intervals, so that the first magnetic member 112 and the second magnetic member 113 form an annular magnetic gap 111, the first magnetic member 112 and the second magnetic member 113 are both magnets, and the first magnetic member 112 and the second magnetic member 113 are correspondingly provided with a magnetic conductor 114 along the first side of the travel axis, and the first magnetic member 112 and the second magnetic member 113 are spaced apart from each other. The corresponding magnetic gap 111 is also formed in the area of ​​the magnetic gap 111 of the corresponding annular structure in the corresponding magnetic conductive body 114, and the magnetic gap 111 formed by the magnetic conductive body 114 is the target position in the magnetic gap 111. The diaphragm 13 is arranged on the side of the magnetic conductive body 114 away from the first magnetic member 112 and the second magnetic member 113 along the travel axis, and there is a preset distance between the diaphragm 13 and the magnetic conductive body 114. The voice coil assembly 12 is fixedly arranged on the diaphragm 13 along the travel axis direction toward the magnetic conductive body 114, and the voice coil assembly 12 includes a plurality of voice coils 121, and the plurality of voice coils 121 are suspended in the magnetic gap 111 along the travel axis direction. Therefore, when a single voice coil 121 enters the target position in the magnetic gap 111, the single voice coil 121 is energized. At this time, due to the action of the two-end magnetic conductors 114, the target position of the magnetic gap 111 forms magnetic lines of force perpendicular to the direction of the travel axis, so that the voice coil 121 has an Ampere force along the direction of the travel axis under the action of the magnetic lines of force, so as to drive the voice coil 121 and the diaphragm 13 to move along the direction of the travel axis. When the voice coil 121 moves out of the target position of the magnetic gap 111, the voice coil 121 is no longer energized, and the next voice coil 121 that enters the target position of the magnetic gap 111 is energized and is subjected to the Ampere force along the direction of the travel axis, and continues to drive the voice coil 121 and the diaphragm 13 along the direction of the travel axis. When the voice coil 121 moves out of the target position of the magnetic gap 111, the voice coil 121 is no longer energized, and the next voice coil 121 that enters the target position of the magnetic gap 111 is energized. The multiple voice coils 121 in the voice coil assembly 12 repeat the above operation, thereby realizing the movement of the voice coil assembly 12 and the diaphragm 13 along the direction of the magnetic force lines. Since only a shorter single voice coil 121 is energized at the target position of the magnetic gap 111 and is subjected to the Ampere force along the direction of the travel axis, the left-right swing experienced by the single voice coil 121 is very small, thereby causing the left-right swing amplitude of the diaphragm 13 connected to the voice coil 121 to be also very small, thereby reducing distortion and improving sound quality.

[0055] In this embodiment, the first magnetic member 112 is a columnar structure, the second magnetic member 113 is an annular structure surrounding the first magnetic member 112, and the first magnetic member 112 and the second magnetic member 113 are provided with a magnetizer 114 corresponding to the first side of the travel axis, and the magnetizer 114 corresponding to the first magnetic member 112 and the second magnetic member 113 also forms an annular magnetic gap 111 in the area corresponding to the magnetic gap 111 of the annular structure, and the magnetic gap 111 formed by the magnetizer 114 is the target position in the magnetic gap 111, and the diaphragm 13 is arranged on the side of the magnetizer 114 away from the first magnetic member 112 and the second magnetic member 113 along the travel axis, and the vibration membrane ... first side of the magnetizer 114 along the travel axis. There is a preset distance between the membrane 13 and the magnetic conductor 114. The diaphragm 13 is connected to two groups of voice coil assemblies 12 at the position corresponding to the magnetic gap 111. The two groups of voice coil assemblies 12 are symmetrically arranged. Each group of voice coil assemblies 12 is suspended in the magnetic gap 111. When a single voice coil 121 enters the target position of the magnetic gap 111, the two groups of voice coil assemblies 12 are affected by the Ampere force, thereby driving the diaphragm 13 to move along the travel axis direction, so that the diaphragm 13 moves more stably along the travel axis direction, and is subject to less force in the left and right directions, further preventing the diaphragm 13 from shaking in the left and right directions, thereby further reducing distortion and improving sound quality.

[0056] like Figure 1 As shown, on the other hand, the present application also provides a loudspeaker 1, comprising a diaphragm 13 and a voice coil 121 driving device as described above, wherein the diaphragm 13 is connected to the voice coil assembly 12 and is pulled by the voice coil assembly 12 to move along the travel axis.

[0057] In this embodiment, the loudspeaker 1 includes a diaphragm 13 and a voice coil 121 driving device, the voice coil 121 driving device includes a magnetic circuit structure 11 and a voice coil assembly 12, the diaphragm 13 is arranged on one side of the voice coil 121 driving device along the travel axis direction, the magnetic circuit structure 11 has a magnetic gap 111, the magnetic gap 111 has a target position, one end of the voice coil assembly 12 is connected to the diaphragm 13, and the other end is suspended in the magnetic gap 111 formed by the magnetic circuit structure 11, the voice coil assembly 12 includes a plurality of voice coils 121, and the plurality of voice coils 121 are sequentially arranged along the travel axis. When a voice coil 121 moves to a target position in the magnetic gap 111 along the travel axis direction, the voice coil 121 will be driven by the driving signal, and thus affected by the Ampere force, and then the voice coil 121 can drive the diaphragm 13 to move along the travel axis direction under the action of the Ampere force, and multiple voice coils 121 are sequentially arranged along the travel axis direction, so that multiple voice coils 121 sequentially enter the target position in the magnetic gap 111, and multiple voice coils 121 sequentially drive the diaphragm 13 to move along the travel axis under the action of the driving signal. Since the length of a single voice coil 121 is short, the Ampere force on the voice coil 121 in the left and right directions when it enters the target position in the magnetic gap 111 is very small, so the left and right swaying of the single voice coil 121 is very small, so that the left and right swaying amplitude of the diaphragm 13 connected to the voice coil 121 is also very small, thereby reducing distortion and improving sound quality.

[0058] like Figure 1 As shown, in the embodiment of the present application, it also includes:

[0059] The limiting member 14 has one end connected to a fixed position and the other end elastically connected to the diaphragm 13 . The limiting member 14 is used to limit the movement of the diaphragm 13 in the non-travel axis direction.

[0060] In this embodiment, the speaker 1 also includes a limiting member 14, one end of which is fixedly connected to a fixing portion 15. The fixing portion 15 is arranged at one end of the second magnetic member 113 away from the first magnetic member 112, and the other end is elastically connected to the diaphragm 13, so as to limit the movement of the diaphragm 13 in the non-travel axis direction, thereby further reducing the shaking of the diaphragm 13 in the left and right directions, thereby further reducing distortion and improving sound quality.

[0061] The present application provides a voice coil drive device and a loudspeaker, wherein the voice coil drive device includes a magnetic circuit structure and a voice coil assembly, the magnetic circuit structure has a magnetic gap, the voice coil assembly is suspended in the magnetic gap formed by the magnetic circuit structure, the voice coil assembly includes a plurality of voice coils, the plurality of voice coils are moved along the travel axis direction under the action of a driving signal, the plurality of voice coils are sequentially connected along the travel axis direction, wherein the direction of the travel axis is parallel to the extension direction of the magnetic gap, and the plurality of voice coils are suspended in the magnetic gap, so that in the process of the plurality of voice coils moving along the travel axis, since the length of each single voice coil included in the plurality of voice coils is relatively short, the Ampere force on the voice coil in the left and right directions is very small, so the left and right swaying on the single voice coil is very small, so that the left and right swaying amplitude on the diaphragm connected to the voice coil is also very small, so that distortion can be reduced and sound quality is improved, and there is no need to increase the stiffness of the support by adding a symmetrical suspension system in order to reduce swaying as in the prior art, so that a magnet with higher performance is not used due to occupying space, and thus there is no need to increase the cost. Therefore, the voice coil drive device provided by the present application improves the sound quality without increasing the cost.

[0062] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A voice coil driving device, characterized in that: include: A magnetic circuit structure having a magnetic gap; A voice coil assembly suspended in the magnetic gap, the voice coil assembly comprising a plurality of voice coils arranged along a travel axis and connected in sequence, the plurality of voice coils moving along the travel axis under the action of a driving signal; A portion of each voice coil is stacked and connected with a portion of an adjacent voice coil along the travel axis; every two adjacent voice coils among the plurality of voice coils are partially overlapped, and one voice coil moves to a target position in the magnetic gap to be energized and acted upon by a driving signal. When the voice coil moves away from the target position in the magnetic gap and stops being energized, the voice coil that partially overlaps with the voice coil has entered the target position in the magnetic gap and is energized to be acted upon by a driving signal.

2. The voice coil driving device according to claim 1, characterized in that: The plurality of voice coils are driven one by one by the driving signal.

3. The voice coil driving device according to claim 2, characterized in that: The drive signal is configured to drive the voice coil to move to a target position in the magnetic gap.

4. The voice coil driving device according to claim 3, characterized in that: The size of the winding of each voice coil in the direction of the travel axis is smaller than the size of the target position in the magnetic gap in the direction of the travel axis.

5. The voice coil driving device according to claim 3, characterized in that: The magnetic circuit structure with a magnetic gap comprises: The paired magnetic members are spaced apart along a first direction, forming the magnetic gap at the spaced apart positions, and the first direction and the traveling axis direction meet a perpendicular condition; The paired magnetic members include a first magnetic member and a second magnetic member, wherein: The first magnetic member and the second magnetic member are both magnets, or The first magnetic component is a magnet, and the second magnetic component is a magnetic conductor.

6. The voice coil driving device according to claim 5, characterized in that: The first magnetic member and the second magnetic member are both magnets, The first magnetic member and the second magnetic member are provided with magnetic conductors on both sides along the travel axis direction, and the corresponding positions of the magnetic conductors are the target positions in the magnetic gap.

7. The voice coil driving device according to claim 6, characterized in that: The first magnetic member is a columnar structure, the second magnetic member is an annular structure, and the second magnetic member is located on the peripheral side of the first magnetic member.

8. A speaker, characterized in that: include: Diaphragm; as well as According to the voice coil driving device of claim 1, the diaphragm is connected to the voice coil assembly and is pulled by the voice coil assembly to move along the travel axis.

9. The loudspeaker according to claim 8, characterized in that Also includes: A limiting member has one end connected to a fixed position and the other end elastically connected to the diaphragm, and the limiting member is used to limit the movement of the diaphragm in the non-travel axis direction.

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