Transducer Device

Abstract

The present application mainly relates to a transducer device, a core module, and an electronic device, wherein the transducer device includes a first coil, a magnet assembly, and a first vibration transmission sheet connecting the first coil and the magnet assembly, wherein the magnet assembly surrounds the outer periphery of the first coil, and the magnet assembly and the first coil are spaced apart in the radial direction of the transducer device and at least partially overlap in the axial direction of the transducer device, and when a first excitation signal is input to the transducer device, the energized first coil generates a first ampere force in the magnetic field formed by the magnet assembly, which moves the first coil and the magnet assembly relative to each other, and does not require structural members such as an iron core and a magnetic flux conduction plate, thereby eliminating the weight of the iron core and the magnetic flux conduction plate, which helps to improve the sensitivity of the transducer device, and the frequency response curve of the transducer device remains flat in the high frequency band (e.g., frequency above 5 kHz), and the resonance peak in the low frequency band can be shifted to a lower frequency band, for example, the peak resonance frequency of the low frequency resonance peak is 500 Hz or less. [Drawing] Figure 3

Description

[Technical Field]

[0001] The present application relates to the technical field of electronic devices, and more particularly to a transducer device, a core module, and an electronic device. [Background technology]

[0002] With the continuous popularization of electronic devices, electronic devices have become an indispensable social and entertainment tool in people's daily lives, and people's requirements for electronic devices are also becoming higher and higher. Electronic devices such as earphones are widely applied in people's daily lives, and by using them in cooperation with terminal devices such as mobile phones and computers, users can enjoy a rich auditory experience. Summary of the Invention [Means for solving the problem]

[0003] A transducer device according to an embodiment of the present application includes a first coil, a magnet assembly, and a first vibration transmission sheet connecting the first coil and the magnet assembly, wherein the magnet assembly surrounds the outer periphery of the first coil, the magnet assembly and the first coil are spaced apart in the radial direction of the transducer device and at least partially overlap in the axial direction of the transducer device, and when a first excitation signal is input to the transducer device, the energized first coil generates a first ampere force in the magnetic field formed by the magnet assembly, which moves the first coil and the magnet assembly relative to each other.

[0004] In some embodiments, no hard magnetic material is placed inside the first coil.

[0005] In some embodiments, the transducer device includes a first magnetic flux conducting member, the first coil encompassing an outer periphery of the first magnetic flux conducting member, and the first magnetic flux conducting member and the magnet assembly at least partially overlap in the axial direction.

[0006] In some embodiments, the ratio of the axial dimension of the first magnetic flux conducting member to the axial dimension of the first coil is 1 or greater.

[0007] In some embodiments, the first magnetic flux conducting member is configured as a hollow structure.

[0008] In some embodiments, the ratio of the radial dimension of the first magnetic flux conducting member to the radial dimension of the first coil is between 0.5 and 1.5.

[0009] In some embodiments, the first magnetic flux conducting member and the magnet assembly are positioned to maintain a relatively fixed state, and at least a portion of the first magnetic flux conducting member is radially spaced from the first coil.

[0010] In some embodiments, the first magnetic flux conducting member includes a first body portion and a first extension portion connected to the first body portion, the first coil encompassing an outer periphery of the first body portion and spaced radially from the first body portion, and the first extension portion connected to the magnet assembly and spaced axially from the first coil.

[0011] In some embodiments, the first vibration transmission sheet includes an inner ring fixing portion and an outer ring fixing portion that are fitted together, and a plurality of radial portions that connect the inner ring fixing portion and the outer ring fixing portion, the outer ring fixing portion being connected to a magnet assembly, the transducer device including a bracket connected to a first coil, and the inner ring fixing portion being connected to a central region of the bracket or to an edge region of the bracket.

[0012] In some embodiments, the first magnetic flux conducting member and the first coil are positioned to maintain a fixed relative state, and an orthogonal projection of the first magnetic flux conducting member onto a reference plane perpendicular to the axial direction and an orthogonal projection of the magnet assembly onto a reference plane do not overlap.

[0013] In some embodiments, the orthogonal projections of the first coil, the magnet assembly and the first magnetic flux conducting member onto a reference plane perpendicular to the radial direction at least partially overlap, and the radial distance of the overlapping region between the first magnetic flux conducting member and the magnet assembly is less than or equal to 1.5 times the minimum distance between the first magnetic flux conducting member and the magnet assembly.

[0014] In some embodiments, the radial distance between the first coil and the first magnetic flux conducting member is less than the radial distance between the first coil and the magnet assembly.

[0015] In some embodiments, the first vibration transmission sheet includes an inner ring fixing portion and an outer ring fixing portion that are fitted together, and a plurality of radial portions that connect the inner ring fixing portion and the outer ring fixing portion, wherein the outer ring fixing portion is connected to the magnet assembly, and the inner ring fixing portion is connected to the first magnetic flux conducting member.

[0016] In some embodiments, the first vibration transmission sheet includes an inner ring fixing portion and an outer ring fixing portion that are fitted together, and a plurality of radial portions that connect the inner ring fixing portion and the outer ring fixing portion, the outer ring fixing portion being connected to a magnet assembly, the transducer device including a bracket connected to the first magnetic flux conducting member, and the inner ring fixing portion being connected to a central region of the bracket or to an edge region of the bracket.

[0017] In some embodiments, the bracket includes two end caps spaced apart in the axial direction, and the two end caps are respectively connected to opposite axial ends of the first magnetic flux conducting member.

[0018] In some embodiments, at least a portion of the first magnetic flux conducting member is made of a hard magnetic material.

[0019] In some embodiments, the number of first vibration transmission sheets is two, and the two first vibration transmission sheets are located on opposite sides of the first coil in the axial direction.

[0020] In some embodiments, the first vibration transmission sheet includes an inner ring fixing portion and an outer ring fixing portion that are fitted together, and a plurality of radial portions that connect the inner ring fixing portion and the outer ring fixing portion, each radial portion extending spirally from the inner ring fixing portion to the outer ring fixing portion, and when viewed along the axial direction, the spiral direction of the radial portion of one first vibration transmission sheet and the spiral direction of the radial portion of the other first vibration transmission sheet are opposite to each other.

[0021] In some embodiments, the first magnetic flux conducting member and the first coil are arranged to maintain a relative fixed state, the first magnetic flux conducting member includes a first main body portion and a first extension portion connected to the first main body portion, the first coil surrounds the outer periphery of the first main body portion, the first extension portion is spaced apart from the magnet assembly in the axial direction, the orthogonal projection of the first main body portion onto a reference plane perpendicular to the axial direction and the orthogonal projection of the magnet assembly onto the reference plane do not overlap, the orthogonal projection of the first extension portion onto the reference plane and the orthogonal projection of the magnet assembly onto the reference plane overlap, and the radial distance between the first main body portion and the magnet assembly is smaller than the axial distance between the first extension portion and the magnet assembly.

[0022] In some embodiments, the transducer device includes a buffer member disposed inside the magnet assembly, the buffer member being axially located on at least one side of the first coil, and the radial dimension of the buffer member being equal to or greater than half the radial dimension of the first coil.

[0023] In some embodiments, the transducer device includes a first magnetic flux conducting member, the first coil surrounds the outer periphery of the first magnetic flux conducting member, the first magnetic flux conducting member and the first coil are positioned to maintain a relative fixed state, and the buffer member is fixed to the first magnetic flux conducting member.

[0024] In some embodiments, the magnet assembly includes one hard magnetic body, the first coil includes two first sub-coils spaced apart in the axial direction, and the axial distance between the central cross section of the first sub-coil and the end face of the hard magnetic body is less than half the axial dimension of the first sub-coil.

[0025] In some embodiments, the two first sub-coils are connected in series with each other and have opposite winding directions.

[0026] In some embodiments, the magnet assembly includes two soft magnetic bodies, each connected to two end surfaces of the hard magnetic body, and the axial distance between the central cross section of the first subcoil and the central cross section of the soft magnetic bodies is less than half the axial dimension of the first subcoil.

[0027] In some embodiments, the magnet assembly includes a plurality of hard magnetic bodies arranged in the axial direction, and any two adjacent hard magnetic bodies are arranged so that the same polarity faces each other, the first coil includes at least one first sub-coil, and at least one of all the first sub-coils and the two adjacent hard magnetic bodies overlap in the axial direction.

[0028] In some embodiments, the number of hard magnetic bodies is two, the first coil includes one first sub-coil, and the first sub-coil and the two hard magnetic bodies overlap in the axial direction.

[0029] In some embodiments, the first vibration transmitting sheet is made of a soft magnetic material.

[0030] In some embodiments, the first coil includes a plurality of first sub-coils, and the number of the first sub-coils is not equal to the number of the hard magnetic materials.

[0031] In some embodiments, the number of first subcoils is smaller than the number of hard magnetic bodies, any one first subcoil and two adjacent hard magnetic bodies overlap in the axial direction, and the first vibration transmission sheet is made of a soft magnetic material.

[0032] In some embodiments, the multiple first subcoils are connected in series with each other, and the winding directions of any two adjacent first subcoils are opposite.

[0033] In some embodiments, the magnet assembly includes a plurality of soft magnetic bodies, and the plurality of soft magnetic bodies and the plurality of hard magnetic bodies are arranged alternately in the axial direction.

[0034] In some embodiments, the transducer device includes a second coil that surrounds the outer periphery of the magnet assembly, the second coil and the magnet assembly being radially spaced apart and at least partially overlapping in the axial direction, and in an operating state in which a second excitation signal is input to the transducer device, the energized second coil generates a second ampere force in the magnetic field that moves the second coil and the magnet assembly relative to one another.

[0035] In some embodiments, the second coil and the first coil are positioned to maintain a relative fixed state.

[0036] In some embodiments, the second coil and the first coil are connected in series with each other.

[0037] In some embodiments, the transducer apparatus includes a second magnetic flux conducting member, at least a portion of which encircles an outer periphery of the second coil and at least partially overlaps the magnet assembly in the axial direction.

[0038] In some embodiments, the second magnetic flux conducting member and the magnet assembly are positioned to maintain a relatively fixed state, and at least a portion of the second magnetic flux conducting member is radially spaced from the second coil.

[0039] In some embodiments, the second magnetic flux conducting member includes a second body portion and a second extension portion connected to the second body portion, the second body portion being configured in a hollow structure, the second body portion enclosing an outer periphery of the second coil and being spaced apart from the second coil in a radial direction, and the second extension portion being connected to the magnet assembly and being spaced apart from the second coil in an axial direction.

[0040] In some embodiments, the second magnetic flux conducting member and the second coil are positioned to maintain a relative fixed state.

[0041] In some embodiments, the radial distance between the second coil and the second magnetic flux conducting member is less than the radial distance between the second coil and the magnet assembly.

[0042] In some embodiments, at least a portion of the second magnetic flux conducting member is made of a hard magnetic material.

[0043] In some embodiments, the magnet assembly includes one hard magnetic body, the second coil includes two second sub-coils spaced apart in the axial direction, and the axial distance between the central cross section of the second sub-coil and the end face of the hard magnetic body is less than half the axial dimension of the second sub-coil.

[0044] In some embodiments, the two second sub-coils are connected in series with each other and have opposite winding directions.

[0045] In some embodiments, the magnet assembly includes two soft magnetic bodies, each connected to two end surfaces of the hard magnetic body, and the axial distance between the central cross section of the second subcoil and the central cross section of the soft magnetic bodies is less than half the axial dimension of the second subcoil.

[0046] In some embodiments, the magnet assembly includes a plurality of hard magnetic bodies arranged in the axial direction, and any two adjacent hard magnetic bodies are arranged so that the same polarity faces each other, and the second coil includes at least one second sub-coil, and at least one of all the second sub-coils and two adjacent hard magnetic bodies overlap in the axial direction.

[0047] In some embodiments, the number of hard magnetic bodies is two, the second coil includes one second sub-coil, and the second sub-coil and the two hard magnetic bodies overlap in the axial direction.

[0048] In some embodiments, the second coil includes a plurality of second sub-coils, and the number of the second sub-coils is not equal to the number of the hard magnetic materials.

[0049] In some embodiments, the second subcoils are connected in series with each other, and the winding directions of any two adjacent second subcoils are opposite.

[0050] In some embodiments, the magnet assembly includes a plurality of soft magnetic bodies, and the plurality of soft magnetic bodies and the plurality of hard magnetic bodies are arranged alternately in the axial direction.

[0051] In some embodiments, the second excitation signal is different from the first excitation signal.

[0052] A core module according to an embodiment of the present application includes a core housing and the above-mentioned transducer device, the transducer device being installed in the receiving cavity of the core housing.

[0053] In some embodiments, the core module includes a second vibration transmission sheet and a vibration panel, the transducer device is suspended within the accommodating cavity via the second vibration transmission sheet, and the vibration panel is connected to the transducer device.

[0054] In some embodiments, the number of second vibration-transmitting sheets is two, and the two second vibration-transmitting sheets are located on opposite sides of the transducer device in the axial direction.

[0055] In some embodiments, the core housing includes a cylindrical side wall and an end wall, the end wall being connected to one end of the cylindrical side wall and the other end of the cylindrical side wall being open, and the core module includes an elastic covering layer connected to the diaphragm panel, the elastic covering layer being connected to the other end of the cylindrical side wall.

[0056] In some embodiments, the core housing includes a cylindrical side wall and a first end wall and a second end wall connected to both ends of the cylindrical side wall, the first end wall having a mounting hole, the transducer device being located between the first end wall and the second end wall, the diaphragm including a main body portion and a connecting portion connected to the main body portion, the main body portion being located outside the core housing, the connecting portion being inserted into the core housing through the mounting hole and connected to the transducer device, and when viewed along the axial direction, the area of ​​the main body portion is larger than the area of ​​the mounting hole, and the area of ​​the mounting hole is larger than the area of ​​the connecting portion.

[0057] In some embodiments, the receiving cavity communicates with the exterior of the core module only through a passageway that is the gap between the connection and the wall of the mounting hole.

[0058] An electronic device according to an embodiment of the present application includes a support assembly and the above-described core module, where the support assembly is connected to the core housing and supports the core module to be mounted in the mounting position.

[0059] In some embodiments, the electronic device includes a case connected to a support assembly, and the core module is assembled within the case as a module.

[0060] The beneficial effects of the present invention are as follows: In the transducer device according to the present invention, the relative movement between the first coil and the magnet assembly is derived from the ampere force generated by the coil when it is energized in a magnetic field, and structural members such as an iron core and a magnetic flux conducting plate are not required, and the weight of the iron core and the magnetic flux conducting plate is omitted, which helps to improve the sensitivity of the transducer device; and the frequency response curve of the transducer device remains flat in the high-frequency band (e.g., frequencies above 5 kHz), and the resonance peak in the low-frequency band can be shifted to a lower frequency band, for example, the peak resonance frequency of the low-frequency resonance peak is below 500 Hz.

[0061] In order to more clearly explain the technical means in the embodiments of the present application, the following briefly introduces the drawings necessary for describing the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can also obtain other drawings based on these drawings without any creative efforts. [Brief explanation of the drawings]

[0062] [Figure 1] 1 is a schematic diagram illustrating a configuration of an embodiment of a transducer device according to the present application. [Figure 2] 1 is a schematic diagram illustrating a configuration of an embodiment of a transducer device according to the present application. [Figure 3] 1 is a schematic diagram illustrating a configuration of an embodiment of a transducer device according to the present application. [Figure 4] 1 is a schematic diagram illustrating a configuration of an embodiment of a transducer device according to the present application. [Figure 5] 1 is a schematic diagram illustrating the configuration of an embodiment of a first vibration-transmitting sheet according to the present application. [Figure 6] 1 is a schematic diagram illustrating a configuration of an embodiment of a transducer device according to the present application. [Figure 7] 1 is a schematic diagram illustrating a configuration of an embodiment of a transducer device according to the present application. [Figure 8] 1 is a schematic diagram illustrating a configuration of an embodiment of a transducer device according to the present application. [Figure 9] 1 is a schematic diagram illustrating a configuration of an embodiment of a transducer device according to the present application. [Figure 10] 1 is a schematic diagram illustrating a configuration of an embodiment of a transducer device according to the present application. [Figure 11] 1 is a schematic diagram illustrating a configuration of an embodiment of a transducer device according to the present application. [Figure 12] 1 is a schematic diagram illustrating a configuration of an embodiment of a transducer device according to the present application. [Figure 13] 1 is a schematic diagram illustrating a configuration of an embodiment of a transducer device according to the present application. [Figure 14] 1 is a schematic diagram illustrating a configuration of an embodiment of a transducer device according to the present application. [Figure 15] 1 is a schematic diagram illustrating a configuration of an embodiment of a transducer device according to the present application. [Figure 16] 1 is a schematic diagram illustrating a configuration of an embodiment of a transducer device according to the present application. [Figure 17] 1 is a schematic diagram illustrating a configuration of an embodiment of a transducer device according to the present application. [Figure 18] 1 is a schematic diagram illustrating a configuration of an embodiment of a transducer device according to the present application. [Figure 19] 1 is a schematic diagram illustrating a configuration of an embodiment of a transducer device according to the present application. [Figure 20] 1 is a schematic diagram illustrating a configuration of an embodiment of a transducer device according to the present application. [Figure 21] 1 is a schematic diagram illustrating a configuration of an embodiment of a transducer device according to the present application. [Figure 22] 1 is a schematic diagram illustrating a configuration of an embodiment of a transducer device according to the present application. [Figure 23] 1 is a schematic diagram illustrating a configuration of an embodiment of a transducer device according to the present application. [Figure 24] 1 is a schematic diagram illustrating a configuration of an embodiment of a transducer device according to the present application. [Figure 25] 1 is a schematic diagram illustrating a configuration of an embodiment of a transducer device according to the present application. [Figure 26] 1 is a schematic diagram illustrating a configuration of an embodiment of a transducer device according to the present application. [Figure 27] FIG. 1 is a schematic diagram illustrating an embodiment of a core module according to the present application. [Figure 28] FIG. 1 is a schematic diagram illustrating an embodiment of a core module according to the present application. [Figure 29] FIG. 1 is a schematic diagram illustrating an embodiment of a core module according to the present application. [Figure 30] FIG. 1 is a schematic diagram illustrating an embodiment of a core module according to the present application. [Figure 31] FIG. 1 is a schematic diagram illustrating an embodiment of a core module according to the present application. [Figure 32] FIG. 1 is a schematic diagram illustrating an embodiment of a core module according to the present application. [Figure 33] 1A to 1C are schematic diagrams illustrating the configuration of various embodiments of the electronic device according to the present application when the electronic device is worn. [Figure 34] 1 is a comparative diagram of frequency response curves of different embodiments of the transducer device according to the present application; [Figure 35] 1 is a comparative diagram of frequency response curves of different embodiments of the transducer device according to the present application; DETAILED DESCRIPTION OF THE INVENTION

[0063] The present application will be described in more detail below with reference to the drawings and examples. Note that the following examples are merely for the purpose of illustrating the present application and are not intended to limit the scope of the present application. Similarly, the following examples are merely some of the examples of the present application, and are not all examples. All other examples that can be obtained by a person skilled in the art without any creative effort are all included in the scope of protection of the present application.

[0064] A reference to an "embodiment" in this application means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the application. Those skilled in the art can explicitly or implicitly understand that the embodiment described in this application can be combined with other embodiments.

[0065] 1, the transducer device 10a may include a coil 11a, a magnet assembly 12a, a magnetic flux conducting cover 13a, a vibration transmitting sheet 14a, and a bracket 15a. The magnet assembly 12a is fixed to the bottom of the magnetic flux conducting cover 13a along the axial direction AD of the transducer device 10a and forms a magnetic gap with the magnetic flux conducting cover 13a in the radial direction RD of the transducer device 10a. The bracket 15a is connected to the magnet assembly 12a via the vibration transmitting sheet 14a. The coil 11a is connected to the bracket 15a and inserted into the magnetic gap. Furthermore, the magnet assembly 12a may include a hard magnetic material 121a connected to the bottom of the magnetic flux conducting cover 13a and a magnetic flux conducting plate 122a connected to the hard magnetic material 121a. The number of the hard magnetic material 121a and the magnetic flux conducting plate 122a may each be plural. Based on this, in an operating state in which an excitation signal is input to the transducer device 10a, the energized coil 11a generates an ampere force in the magnetic field formed by the magnet assembly 12a and the magnetic flux conducting cover 13a, which moves the coil 11a (and bracket 15a) and the magnet assembly 12a (and magnetic flux conducting cover 13a) relative to each other, and further converts the excitation signal into a corresponding mechanical vibration.

[0066] 2, the transducer device 10b may include a coil 11b, a magnet assembly 12b, an iron core 13b, a vibration-transmitting sheet 14b, and a magnetic flux-conducting plate 15b. The coil 11b may be wound around the iron core 13b, and one magnetic flux-conducting plate 15b may be fixed to each end of the iron core 13b. The magnet assembly 12b may surround the outer periphery of the coil 11b and the magnetic flux-conducting plate 15b, and each end of the iron core 13b may be connected to the magnet assembly 12b via the vibration-transmitting sheet 14b. The magnet assembly 12b may include two hard magnetic bodies 121b and a magnetic flux-conducting member 122b partially interposed between the two hard magnetic bodies 121b, with the two hard magnetic bodies 121b having the same polarity facing each other. Furthermore, the coil 11b and the magnetic flux conducting plate 15b are spaced apart from the magnet assembly 12b in the radial direction RD of the transducer device 10b, the projections of the magnetic flux conducting plate 15b and the magnet assembly 12b (specifically, the magnetic flux conducting member 122b) onto the axial direction AD of the transducer device 10b overlap, and the distance in the radial direction RD between the iron core 13b and the magnet assembly 12b (specifically, the magnetic flux conducting member 122b) is greater than the distance in the axial direction AD between the magnetic flux conducting plate 15b and the magnet assembly 12b (specifically, the magnetic flux conducting member 122b). Based on this, in an operating state in which an excitation signal is input to the transducer device 10b, the energized coil 11b magnetizes the iron core 13b and the magnetic flux conducting plate 15b, causing them to attract or repel each other with the magnet assembly 12b, causing relative movement between the coil 11b (and the iron core 13b, the magnetic flux conducting plate 15b) and the magnet assembly 12b, and further converting the excitation signal into corresponding mechanical vibrations.

[0067] 3 , the transducer device 10 may include a first coil 11, a magnet assembly 12, and a first vibration transmission sheet 13 connecting the first coil 11 and the magnet assembly 12. The magnet assembly 12 surrounds the outer periphery of the first coil 11, and the magnet assembly 12 and the first coil 11 are spaced apart from each other in a radial direction RD of the transducer device 10 and at least partially overlap each other in an axial direction AD of the transducer device 10; that is, orthogonal projections of the magnet assembly 12 and the first coil 11 onto a reference plane perpendicular to the radial direction RD at least partially overlap each other. Based on this, in an operating state in which a first excitation signal is input to the transducer device 10, the energized first coil 11 generates a first ampere force in a magnetic field formed by the magnet assembly 12, which moves the first coil 11 and the magnet assembly 12 relative to each other, and further converts the first excitation signal into a corresponding mechanical vibration. 2, in this technical solution, the relative movement between the first coil 11 and the magnet assembly 12 comes from the ampere force generated by the coil when it is energized in the magnetic field, and structural members such as the iron core 13b and the magnetic flux conducting plate 15b are not required, and the weight of the iron core 13b and the magnetic flux conducting plate 15b is omitted, which helps to improve the sensitivity of the transducer device 10. Also, as shown in FIG. 34, compared with the frequency response curve of the technical solution shown in FIG. 2 (e.g., shown as curve C34_1 in FIG. 34), the frequency response curve of the technical solution of this solution (e.g., shown as curve C34_2 in FIG. 34) is still flat in the high frequency band (e.g., frequencies above 5 kHz), and the resonance peak of the low frequency band can be shifted to a lower frequency band, for example, the peak resonance frequency of the low frequency resonance peak is below 500 Hz.2, when the length of the wire used to manufacture the coil is constant, the radial dimension of coil 11b is small, so coil 11b needs to be wound with more turns. That is, because the number of turns of coil 11b is large, the structure consisting of coil 11b, iron core 13b, and magnetic flux conducting plate 15b has high inductance in the high frequency band, which increases impedance in the high frequency band and reduces sensitivity in the high frequency band. In this technical solution, the radial dimension of first coil 11 is larger, and the number of turns of first coil 11 is accordingly smaller, which reduces inductance in the high frequency band, avoids sensitivity reduction in the high frequency band, and helps make the corresponding frequency response curve flatter in the high frequency band. Furthermore, as a cause of the latter, in the technical means shown in Figure 2, the orthogonal projections of the magnetic flux conduction plate 15b and the magnet assembly 12b (specifically, the magnetic flux conduction member 122b) in the axial direction AD partially overlap, so the vibration transmission sheet 14b needs to avoid direct magnetic adsorption between the magnetic flux conduction plate 15b and the magnet assembly 12b (specifically, the magnetic flux conduction member 122b) in the axial direction AD, which increases the rigidity of the vibration transmission sheet 14b in the axial direction AD and further increases the peak resonance frequency of the low-frequency resonance peak in the corresponding frequency response curve.In this technical means, the operating principle of the transducer device 10 is different from that of the transducer device 10b in Figure 2, and there is no need to worry about so-called magnetic adsorption in the axial direction AD, which helps to reduce the rigidity of the first vibration transmission sheet 13 in the axial direction AD and shift the peak resonance frequency of the low-frequency resonance peak in the corresponding frequency response curve to a lower frequency band.

[0068] In some embodiments, compared to the technical solution shown in Fig. 1, no hard magnetic material may be installed inside the first coil 11, which helps to avoid sound leakage from the transducer device 10 due to the cavity sound effect. As shown in Fig. 1, the cavity sound effect occurs when, in the process of the coil 11a moving relative to the magnet assembly 12a (and the magnetic flux conducting cover 13a), the air pressure in the magnetic gap between the magnet assembly 12a and the magnetic flux conducting cover 13a changes accordingly, causing sound leakage.

[0069] In some embodiments, the transducer device 10 may include a first bracket 14 connected to the first coil 11, and the first coil 11 is connected to the first vibration-transmitting sheet 13 via the first bracket 14. The first bracket 14 may be made of a soft magnetic material or a plastic material. By arranging the bracket 14 in this manner, compared to the technical solution shown in FIG. 1 , the first bracket 14 in this technical solution can be increased in size in the axial direction AD (e.g., thicker in the direction away from the first vibration-transmitting sheet 13 along the axial direction AD) and reduced in size in the radial direction RD. This improves the rigidity of the first bracket 14, shifting the high-frequency resonance peak of the transducer device 10 to a higher frequency band (e.g., greater than 7 kHz), and improving the high-frequency mode. Furthermore, the lead wire of the first coil 11 may be fixed to the side of the first bracket 14 away from the first vibration-transmitting sheet 13 with a medium such as an adhesive. Even if a bulge occurs after the adhesive hardens, it will not structurally interfere with other structural members.

[0070] In some embodiments, the transducer device 10 may include a first magnetic flux conducting member 15, wherein the first coil 11 surrounds the outer periphery of the first magnetic flux conducting member 15, and the first magnetic flux conducting member 15 and the magnet assembly 12 at least partially overlap in the axial direction AD, i.e., the orthogonal projections of the first magnetic flux conducting member 15 and the magnet assembly 12 onto a reference plane perpendicular to the radial direction RD at least partially overlap, thereby making the magnetic flux lines of the magnetic field generated by the magnet assembly 12 more concentrated and passing through the first coil 11 to a greater extent, i.e., reducing leakage magnetic flux and helping to improve the sensitivity of the transducer device 10.

[0071] In some embodiments, the ratio of the dimension of the first magnetic flux conducting member 15 in the axial direction AD to the dimension of the first coil 11 in the axial direction AD may be greater than or equal to 1. For a given dimension of the first coil 11 in the axial direction AD, if the dimension of the first magnetic flux conducting member 15 in the axial direction AD is too small, more of the magnetic flux lines of the magnetic field generated by the magnet assembly 12 will have difficulty passing through the first coil 11, i.e., more leakage magnetic flux will occur.

[0072] In some embodiments, compared with the technical means shown in Fig. 2, the first magnetic flux conducting member 15 may be set to a hollow structure, which is helpful in reducing sound leakage from the transducer device 10 and also helpful in improving the sensitivity of the transducer device 10, as will be described below. Also, as shown in Fig. 34, compared with the frequency response curve of the technical means shown in Fig. 2 (for example, shown as curve C34_1 in Fig. 34), the frequency response curve of this technical means (for example, shown as curve C34_2 in Fig. 34) is still flat in the high frequency band (for example, frequencies above 5 kHz). 2, the iron core 13b has a solid structure, and therefore the structure consisting of the coil 11b, the iron core 13b, and the magnetic flux conducting plate 15b has high inductance at high frequencies, resulting in high impedance and reduced sensitivity at high frequencies. In this technical solution, the first magnetic flux conducting member 15 has a hollow structure, which reduces the inductance at high frequencies, avoids the reduction in sensitivity at high frequencies, and helps to flatten the corresponding frequency response curve at high frequencies. Furthermore, the ratio of the radial dimension of the first magnetic flux conducting member 15 to the radial dimension of the first coil 11 at RD may be between 0.5 and 1.5. When the dimension of the first coil 11 in the radial direction RD is constant, if the dimension of the first magnetic flux conduction member 15 in the radial direction RD is too small, the structural strength of the first magnetic flux conduction member 15 is likely to be insufficient, and if the dimension of the first magnetic flux conduction member 15 in the radial direction RD is too large, the inductance in the high frequency band is likely to be large.

[0073] 4, the first magnetic flux conducting member 15 and the magnet assembly 12 may be installed to maintain a relatively fixed state, with at least a portion of the first magnetic flux conducting member 15 spaced apart from the first coil 11 in the radial direction RD. Installing the first magnetic flux conducting member 15 in this manner allows the first magnetic flux conducting member 15 to move relative to the first coil 11 in conjunction with the magnet assembly 12, which helps to improve the sensitivity of the transducer device 10.

[0074] In some embodiments, the first magnetic flux conducting member 15 may include a first main body portion 151 and a first extension portion 152 connected to the first main body portion 151, and the first extension portion 152 may extend outward from the first main body portion 151 along the radial direction RD. The first coil 11 surrounds the outer periphery of the first main body portion 151 and is spaced apart from the first main body portion 151 in the radial direction RD, and the first extension portion 152 is connected to the magnet assembly 12 and is spaced apart from the first coil 11 in the axial direction AD. Furthermore, the first magnetic flux conduction member 15 may be entirely magnetically conductive, for example, the first main body 151 and the first extension 152 are both made of a soft magnetic material, or the first magnetic flux conduction member 15 may be partially magnetically conductive, for example, the first main body 151 and the first extension 152 are made of a soft magnetic material and a plastic material, respectively. The first main body 151 and the first extension 152 may be integrally molded structural members.

[0075] In some embodiments, the first body portion 151 may be configured as a hollow structure, which not only helps to reduce the weight of the transducer device 10 but also helps to avoid sound leakage from the transducer device 10 due to cavity sound effects.

[0076] 4 and 5, the first vibration transmission sheet 13 may include an inner ring fixing portion 131 and an outer ring fixing portion 132 fitted together, and a plurality of radial portions 133 connecting the inner ring fixing portion 131 and the outer ring fixing portion 132. The plurality of radial portions 133 allow the inner ring fixing portion 131 and the outer ring fixing portion 132 to move relatively at least along the axial direction AD due to an external force. Furthermore, the outer ring fixing portion 132 may be connected to the magnet assembly 12, and the inner ring fixing portion 131 may be connected to a central region of the first bracket 14, thereby allowing the first coil 11 and the magnet assembly 12 to move relatively due to an ampere force.

[0077] In some embodiments, as shown in FIGS. 6 and 5 , the first vibration transmission sheet 13 may include an inner ring fixing portion 131 and an outer ring fixing portion 132 that are fitted together, and a plurality of radial portions 133 that connect the inner ring fixing portion 131 and the outer ring fixing portion 132. The plurality of radial portions 133 allow the inner ring fixing portion 131 and the outer ring fixing portion 132 to move relatively at least along the axial direction AD due to an external force. Furthermore, the outer ring fixing portion 132 may be connected to the magnet assembly 12, and the inner ring fixing portion 131 may be connected to an edge region of the first bracket 14, thereby allowing the first coil 11 and the magnet assembly 12 to move relatively due to an ampere force. It should be noted that, compared with the technical solution shown in FIG. 5 , in this technical solution, the degree of curvature of the radial portions 133 is lower, which reduces the probability of stress concentration occurring when the transducer device 10 experiences an extreme operating condition, such as being dropped, and helps improve the reliability of the first vibration transmission sheet 13. Furthermore, compared to the technical means shown in Figure 5, in this technical means, there is no need to maintain a safety gap in the axial direction AD between the first vibration transmission sheet 13 and the first bracket 14, which helps to reduce the axial dimension of the transducer device 10.

[0078] 7, the first magnetic flux conducting member 15 and the first coil 11 may be installed to maintain a relatively fixed state, and the orthogonal projection of the first magnetic flux conducting member 15 onto a reference plane perpendicular to the axial direction AD and the orthogonal projection of the magnet assembly 12 onto the same reference plane may not overlap. Installing the first magnetic flux conducting member 15 in this manner allows the first magnetic flux conducting member 15 to move relative to the magnet assembly 12, following the movement of the first coil 11, which not only helps to simplify the structure of the first magnetic flux conducting member 15 but also helps to further improve (and ultimately eliminate) sound leakage from the transducer device 10 due to the cavity sound effect.

[0079] Furthermore, the first magnetic flux conducting member 15 may be configured to have a hollow structure so that the total weight of the first magnetic flux conducting member 15 and the first coil 11 does not become too large, which not only helps to reduce the weight of the transducer device 10 but also helps to improve the sensitivity of the transducer device 10.

[0080] In some embodiments, the orthogonal projections of the first coil 11, the magnet assembly 12, and the first magnetic flux conducting member 15 onto a reference plane perpendicular to the radial direction RD may at least partially overlap. The distance in the radial direction RD of the overlapping region between the first magnetic flux conducting member 15 and the magnet assembly 12 may be 1.5 times or less than the minimum distance between the first magnetic flux conducting member 15 and the magnet assembly 12, so that the magnetic flux lines of the magnetic field generated by the magnet assembly 12 are more concentrated and pass more through the first coil 11, i.e., the leakage magnetic flux is reduced, which helps to improve the sensitivity of the transducer device 10. 2, the distance in the radial direction RD between the iron core 13b and the magnet assembly 12b (specifically, the magnetic flux conduction member 122b) is greater than the distance in the axial direction AD between the magnetic flux conduction plate 15b and the magnet assembly 12b (specifically, the magnetic flux conduction member 122b), so fewer magnetic flux lines of the magnetic field generated by the magnet assembly 12b pass through the coil 11b, whereas in this technical solution, the magnetic flux lines of the magnetic field generated by the magnet assembly 12 are more concentrated and pass more through the first coil 11. Furthermore, in the embodiment shown in FIG. 7, the distance in the radial direction RD of the overlapping region between the first magnetic flux conduction member 15 and the magnet assembly 12 is equal to the minimum distance between the first magnetic flux conduction member 15 and the magnet assembly 12.

[0081] In some embodiments, the distance in the radial direction RD between the first coil 11 and the first magnetic flux conducting member 15 may be smaller than the distance in the radial direction RD between the first coil 11 and the magnet assembly 12, for example, the first coil 11 is wound around the first magnetic flux conducting member 15. By installing in this manner, compared with the technical solution shown in Fig. 4, the magnetic gap in the radial direction RD between the first magnetic flux conducting member 15 and the magnet assembly 12 in this technical solution is smaller, which helps to improve the sensitivity of the transducer device 10.

[0082] 8 and 7, the first vibration transmission sheet 13 may include an inner ring fixing portion 131 and an outer ring fixing portion 132 fitted together, and a plurality of radial portions 133 connecting the inner ring fixing portion 131 and the outer ring fixing portion 132. The plurality of radial portions 133 allow the inner ring fixing portion 131 and the outer ring fixing portion 132 to move relatively at least along the axial direction AD due to an external force. Furthermore, the outer ring fixing portion 132 may be connected to the magnet assembly 12, and the inner ring fixing portion 131 may be connected to the first magnetic flux conduction member 15, thereby allowing the first coil 11 and the magnet assembly 12 to move relatively due to an ampere force. The number of first vibration transmission sheets 13 may be two, and the two first vibration transmission sheets 13 are located on opposite sides of the first coil 11 in the axial direction AD, which helps to reduce the risk of magnetic attraction between the first magnetic flux conduction member 15 and the magnet assembly 12, especially in extreme operating conditions such as a drop. Furthermore, each radial portion 133 extends spirally from the inner ring fixing portion 131 to the outer ring fixing portion 132, and the spiral direction of the radial portion 133 of one first vibration transmission sheet 13 is opposite to that of the other first vibration transmission sheet 13 when viewed along the axial direction AD. By arranging them in this manner, if the first coil 11 and the magnet assembly 12 tend to twist around the axial direction AD, one of the two first vibration transmission sheets 13 can prevent this twisting tendency, avoiding unnecessary collision and further reducing the magnetic gap in the radial direction RD between the first magnetic flux conduction member 15 and the magnet assembly 12. It should be noted that in an embodiment in which the transducer device 10 includes a first bracket 14 connected to a first magnetic flux conducting member 15, the connection of the inner ring fixing portion 131 to the first magnetic flux conducting member 15 can also be simply considered as the connection of the inner ring fixing portion 131 to the edge region of the first bracket 14.

[0083] 9 and 5, the first vibration transmission sheet 13 may include an inner ring fixing portion 131 and an outer ring fixing portion 132 fitted together, and a plurality of radial portions 133 connecting the inner ring fixing portion 131 and the outer ring fixing portion 132. The plurality of radial portions 133 allow the inner ring fixing portion 131 and the outer ring fixing portion 132 to move relatively at least along the axial direction AD due to an external force. Furthermore, the outer ring fixing portion 132 may be connected to the magnet assembly 12, and the inner ring fixing portion 131 may be connected to a central region of the first bracket 14, thereby allowing the first coil 11 and the magnet assembly 12 to move relatively due to an ampere force.

[0084] Furthermore, the first bracket 14 may include two first end caps 141 spaced apart in the axial direction AD, and the two first end caps 141 are respectively connected to both ends of the first magnetic flux conduction member 15 in the axial direction AD. Similarly, the number of first vibration transmission sheets 13 may be two, and the two first vibration transmission sheets 13 are located on opposite sides of the first coil 11 in the axial direction AD. The inner ring fixing portion 131 of one first vibration transmission sheet 13 is connected to a central region of one first end cap 141, and the inner ring fixing portion 131 of the other first vibration transmission sheet 13 is connected to a central region of the other first end cap 141.

[0085] 10, 5, and 7, the first vibration transmission sheet 13 may include an inner ring fixing portion 131 and an outer ring fixing portion 132 that are fitted together, and a plurality of radial portions 133 that connect the inner ring fixing portion 131 and the outer ring fixing portion 132. The plurality of radial portions 133 allow the inner ring fixing portion 131 and the outer ring fixing portion 132 to move relatively at least along the axial direction AD due to an external force. Furthermore, the number of first vibration transmission sheets 13 may be two, and the two first vibration transmission sheets 13 are located on opposite sides of the first coil 11 in the axial direction AD. The outer ring fixing portions 132 of the two first vibration transmission sheets 13 are each connected to the magnet assembly 12, the inner ring fixing portion 131 of one first vibration transmission sheet 13 is connected to the central region of the first bracket 14, and the inner ring fixing portion 131 of the other first vibration transmission sheet 13 is connected to the first magnetic flux conduction member 15, thereby allowing the first coil 11 and the magnet assembly 12 to move relative to each other due to the ampere force.

[0086] In some embodiments, at least a portion of first magnetic flux conducting member 15 may be made of a hard magnetic material, for example, first magnetic flux conducting member 15 includes hard and soft magnetic materials stacked along the axial direction AD, allowing first magnetic flux conducting member 15 to magnetically attract soft magnetic materials such as nickel steel billets, silicon steel billets, and soft magnetic ferrite.

[0087] 11 , the first magnetic flux conducting member 15 and the first coil 11 may be installed to maintain a fixed state relative to each other. The first magnetic flux conducting member 15 may include a first main body portion 151 and a first extension portion 152 connected to the first main body portion 151, and the first extension portion 152 may extend outward from the first main body portion 151 along the radial direction RD. Furthermore, the first coil 11 may take up an outer periphery of the first main body portion 151, for example, the first coil 11 may be wound around the outer periphery of the first main body portion 151, and the first extension portion 152 may be spaced apart from the magnet assembly 12 in the axial direction AD. The orthogonal projection of the first main body portion 151 onto a reference plane perpendicular to the axial direction AD does not overlap with the orthogonal projection of the magnet assembly 12 onto the same reference plane, while the orthogonal projection of the first extension portion 152 onto the same reference plane overlaps with the orthogonal projection of the magnet assembly 12 onto the same reference plane, and the distance between the first main body portion 151 and the magnet assembly 12 in the radial direction RD is smaller than the distance between the first extension portion 152 and the magnet assembly 12 in the axial direction AD. This arrangement also allows the magnetic flux lines of the magnetic field generated by the magnet assembly 12 to be more concentrated and pass through the first coil 11 more, i.e., reduces leakage magnetic flux, which helps to improve the sensitivity of the transducer device 10. It should be noted that, unlike the technical solution shown in FIG. 2 , in this technical solution, the power of the relative movement between the first coil 11 and the magnet assembly 12 still comes from ampere force. Similarly, the first main body portion 151 may have a hollow structure, and both the first main body portion 151 and the first extension portion 152 may be made of a soft magnetic material.

[0088] In some embodiments, as shown in FIG. 12 , the transducer device 10 may include a buffer member 16 disposed inside the magnet assembly 12. The buffer member 16 is located on at least one side in the axial direction AD. For example, a buffer member 16 is disposed on each of opposite sides of the first coil 11 in the axial direction AD. The buffer member 16 may be fixed to the magnet assembly 12 or the first magnetic flux conducting member 15. Furthermore, the dimension of the buffer member 16 in the radial direction RD is larger than the dimension of the first coil 11 in the radial direction RD, which helps reduce the risk of magnetic attraction between the first magnetic flux conducting member 15 and the magnet assembly 12, especially in extreme operating conditions such as dropping. The buffer member 16 may be made of foam sponge. It should be noted that in embodiments in which the first magnetic flux conducting member 15 and the first coil 11 are disposed to maintain a relative fixed state, the buffer member 16 can be adaptively disposed according to actual needs, for example, in any one of the technical means shown in FIGS. 7 to 11 .

[0089] Next, the specific structures and relationships of the first coil 11 and the magnet assembly 12 will be described by way of example. For convenience of description, the technical means shown in FIG. 9 is taken as the basic structure of the transducer device 10. Therefore, after the specific structures and relationships of the first coil 11 and the magnet assembly 12 are determined, the specific structures and relationships of other structural members in the transducer device 10, such as the first vibration transmitting sheet 13, the first bracket 14, the first magnetic flux conducting member 15, and the buffer member 16, can all be adaptively adjusted according to actual needs. For details, please refer to the relevant description of any one of the embodiments shown in FIGS. 3 to 12, and a description thereof will be omitted here.

[0090] In some embodiments, as shown in FIG. 13 , the magnet assembly 12 may include one hard magnetic body 121 and only one first coil 11. The hard magnetic body 121 and the first coil 11 at least partially overlap in the axial direction AD. That is, the orthogonal projections of the hard magnetic body 121 and the first coil 11 onto a reference plane perpendicular to the radial direction RD at least partially overlap. In the circumferential direction around the axial direction AD, the hard magnetic body 121 may have a complete annular structure or may be joined by multiple arc blocks. In the axial direction AD, the hard magnetic body 121 may be joined by multiple hard magnetic bodies with opposite polarities. This arrangement results in a non-uniform magnetic field distribution in the hard magnetic body 121 in three-dimensional space, and the magnetic field strength of the magnetic field generated by the magnet assembly 12 is also non-uniform everywhere. For example, the magnetic field strength is stronger at both ends of the hard magnetic body 121 in the axial direction AD than at the center, and most of the first coil 11 corresponds exactly to the center of the hard magnetic body 121. This results in a smaller average value of the magnetic field strength B acting on the first coil 11 in the ampere-force calculation formula F∝BIL.

[0091] 14 , the magnet assembly 12 may include one hard magnetic material 121, and the first coil 11 may include two first subcoils 111 spaced apart in the axial direction AD, with the two first subcoils 111 adjacent to both ends of the hard magnetic material 121. The distance in the axial direction AD between the central cross section of the first subcoil 111 (e.g., shown at P1 in FIG. 14 ) and the end face of the hard magnetic material 121 (e.g., shown at P2 in FIG. 14 ) may be equal to or less than half the dimension of the first subcoil 111 in the axial direction AD. Preferably, the central cross section of the first subcoil 111 (e.g., shown at P1 in FIG. 14 ) and the end face of the hard magnetic material 121 (e.g., shown at P2 in FIG. 14 ) are flush with each other in the axial direction AD. By arranging them in this manner, the two first sub-coils 111 are located at positions where the magnetic field strength is high in the magnetic field formed by the magnet assembly 12, which can help improve the average value of the magnetic field strength B and improve the sensitivity of the transducer device 10. It should be noted that the central cross section of the first sub-coil 111 (for example, as shown at P1 in FIG. 14) may be a plane on which half the dimension of the first sub-coil 111 in the axial direction AD is located, or a plane on which half the number of turns of the first sub-coil 111 is located, and a description thereof will be omitted below.

[0092] In some embodiments, the two first sub-coils 111 may be connected in series with each other and may have opposite winding directions, which allows the direction of the ampere force generated by each of the two first sub-coils 111 to remain the same. Of course, in other embodiments, the two first sub-coils 111 may be connected in parallel with each other.

[0093] In some embodiments, the magnet assembly 12 may include two soft magnetic bodies 122, which are respectively connected to two end surfaces of the hard magnetic body 121, so that the magnetic flux lines of the magnetic field generated by the magnet assembly 12 are more concentrated and pass through the first coil 11 more, i.e., leakage magnetic flux is reduced, which helps to improve the sensitivity of the transducer device 10. The distance in the axial direction AD between the central cross section of the first subcoil 111 (e.g., shown at P1 in FIG. 14 ) and the central cross section of the soft magnetic body 122 (e.g., shown at P3 in FIG. 14 ) may be equal to or less than half the dimension of the first subcoil 111 in the axial direction AD. Preferably, the central cross section of the first subcoil 111 (e.g., shown at P1 in FIG. 14 ) and the central cross section of the soft magnetic body 122 (e.g., shown at P3 in FIG. 14 ) are flush with each other in the axial direction AD. By arranging them in this manner, the two first sub-coils 111 are located at positions where the magnetic field strength is high in the magnetic field formed by the magnet assembly 12, which can help improve the average value of the magnetic field strength B and improve the sensitivity of the transducer device 10. It should be noted that the central cross section of the soft magnetic material 122 (for example, as shown in P3 in FIG. 14) may be a plane where half the dimension of the soft magnetic material 122 in the axial direction AD is located, and a description thereof will be omitted below.

[0094] In some embodiments, as shown in Figures 15 to 17, the magnet assembly 12 may include multiple hard magnetic bodies 121 arranged in the axial direction AD, for example, in Figures 15 and 16 there are two hard magnetic bodies 121, and for example, in Figure 17 there are three hard magnetic bodies 121, and any two adjacent hard magnetic bodies 121 are arranged with the same polarities facing each other so that the magnetic field strength at the end of any one hard magnetic body 121 of the magnetic field formed by the magnet assembly 12 is as high as possible. 15, there is one first subcoil 111, for example, in FIG. 16, there are three first subcoils 111, and further, for example, in FIG. 17, there are two first subcoils 111, and at least one of all the first subcoils 111 and two adjacent hard magnetic materials 121 may overlap in the axial direction AD, that is, the orthogonal projections of the at least one first subcoil 111 and the two adjacent hard magnetic materials 121 onto a reference plane perpendicular to the radial direction RD may overlap. By arranging the first subcoil 111 in this manner, the first subcoil 111 is located at a position where the magnetic field strength is high in the magnetic field formed by the magnet assembly 12, which can help improve the average value of the magnetic field strength B and improve the sensitivity of the transducer device 10.

[0095] Furthermore, the magnet assembly 12 may include a plurality of soft magnetic bodies 122, and the plurality of soft magnetic bodies 122 and the plurality of hard magnetic bodies 121 may be arranged alternately in the axial direction AD, so that the magnetic flux lines of the magnetic field generated by the magnet assembly 12 are more concentrated and pass through the first coil 11 more, that is, the leakage magnetic flux is reduced, which helps to improve the sensitivity of the transducer device 10.

[0096] 15 , the number of hard magnetic materials 121 may be two, and the first coil 11 may include one first subcoil 111. The first subcoil 111 and the two hard magnetic materials 121 may overlap in the axial direction AD. That is, the orthogonal projections of the first subcoil 111 and the two adjacent hard magnetic materials 121 onto a reference plane perpendicular to the radial direction RD may overlap. This allows the first subcoil 111 to be located at a position where the magnetic field strength is high in the magnetic field formed by the magnet assembly 12, thereby improving the average value of the magnetic field strength B and the sensitivity of the transducer device 10. As with the technical solution shown in FIG. 14 , in this technical solution, the distance between the central cross section of the first subcoil 111 and the central cross section of the soft magnetic material 122 in the axial direction AD may be less than half the dimension of the first subcoil 111 in the axial direction AD. Preferably, the central cross sections of the first subcoil 111 and the soft magnetic material 122 are flush with each other in the axial direction AD. By arranging them in this manner, the two first sub-coils 111 are located at positions where the magnetic field strength is high in the magnetic field generated by the magnet assembly 12, which can help improve the average value of the magnetic field strength B and improve the sensitivity of the transducer device 10. Furthermore, the first vibration-transmitting sheet 13 may be made of a soft magnetic material, i.e., the first vibration-transmitting sheet 13 is capable of conducting magnetic flux, so that the magnetic flux lines of the magnetic field generated by the magnet assembly 12 are more concentrated and pass more through the first coil 11, i.e., leakage magnetic flux is reduced, which helps improve the sensitivity of the transducer device 10. Specifically, as shown in Figure 35, under the same conditions, compared with the frequency response curve of a technical means in which the first vibration transmission sheet 13 does not conduct magnetic flux (for example, shown as curve C35_1 in Figure 35), in this technical means, the first vibration transmission sheet 13 is capable of conducting magnetic flux, so that most of the corresponding frequency response curve (for example, shown as curve C35_2 in Figure 35) is located above curve C35_2, that is, the transducer device 10 related to this technical means has higher sensitivity.

[0097] In some embodiments, as shown in Figures 16 and 17, the magnet assembly 12 may include a plurality of hard magnetic bodies 121 arranged in the axial direction AD, and the first coil 11 may include a plurality of first sub-coils 111, and the number of the first sub-coils 111 and the number of the hard magnetic bodies 121 may not be equal, for example, in Figure 16, there are two hard magnetic bodies 121 and three first sub-coils 111, and also, for example, in Figure 17, there are three hard magnetic bodies 121 and two first sub-coils 111. At least one first subcoil 111 and two adjacent hard magnetic materials 121 may overlap in the axial direction AD, i.e., the orthogonal projections of at least one first subcoil 111 and two adjacent hard magnetic materials 121 onto a reference plane perpendicular to the radial direction RD may overlap, thereby allowing each first subcoil 111 to be located at a position where the magnetic field strength is as high as possible in the magnetic field formed by the magnet assembly 12, thereby improving the average value of the magnetic field strength B and the sensitivity of the transducer device 10. As with the technical solution shown in FIG. 14 , in this technical solution, the distance between the central cross section of the first subcoil 111 and the central cross section of the soft magnetic material 122 in the axial direction AD may be equal to or less than half the dimension of the first subcoil 111 in the axial direction AD. Preferably, the central cross sections of the first subcoil 111 and the soft magnetic material 122 are flush with each other in the axial direction AD. By arranging them in this manner, each of the first sub-coils 111 is located at a position where the magnetic field strength generated by the magnet assembly 12 is as high as possible, which helps to improve the average value of the magnetic field strength B and improve the sensitivity of the transducer device 10. Furthermore, the first vibration transmission sheet 13 may be made of a soft magnetic material, which allows the magnetic flux lines of the magnetic field generated by the magnet assembly 12 to be more concentrated and pass more through the first coil 11, i.e., reduces leakage magnetic flux and helps to improve the sensitivity of the transducer device 10.Furthermore, the number of first subcoils 111 may be smaller than the number of hard magnetic bodies 121. For example, in FIG. 17, there are three hard magnetic bodies 121 and two first subcoils 111, and any one of the first subcoils 111 and the two adjacent hard magnetic bodies 121 may overlap in the axial direction AD. That is, the orthogonal projections of the first subcoil 111 and the two adjacent hard magnetic bodies 121 onto a reference plane perpendicular to the radial direction RD may overlap. The first vibration transmission sheet 13 may be made of a soft magnetic material, thereby making the magnetic flux lines of the magnetic field generated by the magnet assembly 12 more concentrated and passing through more of the first coils 11. That is, the leakage magnetic flux is reduced, which helps to improve the sensitivity of the transducer device 10.

[0098] In some embodiments, the multiple first subcoils 111 may be connected in series with each other, and the winding directions of any two adjacent first subcoils 111 may be opposite. By arranging them in this manner, the direction of the ampere force generated by each of the multiple first subcoils 111 can be maintained the same. Of course, in some other embodiments, the multiple first subcoils 111 may be connected in parallel with each other.

[0099] Generally, the smaller the resistance of the first coil 11, the smaller the voltage division, and the transducer device 10 is generally connected to a corresponding power amplifier, and the output efficiency of the power amplifier is proportional to the magnitude of the load connected thereto (e.g., the resistance of the first coil 11). Based on this, if the dimension of the first coil 11 in the axial direction AD is increased, for example, if the number of turns of the first coil 11 is increased, the resistance of the first coil 11 increases, but the average value of the magnetic field strength B decreases accordingly. Therefore, compared to when the number of first coils 11 is only one, or when the first coil 11 includes one first sub-coil 111, the first coil 11 includes multiple first sub-coils 111, and each of the first sub-coils 111 is positioned as close as possible to the position where the magnetic field strength is highest in the magnetic field formed by the magnet assembly 12, which not only increases the resistance of the first coil 11 and improves the output efficiency of the power amplifier, but also improves the average value of the magnetic field strength B and improves the sensitivity of the transducer device 10.

[0100] 18 to 21, the transducer device 10 may include a second coil 17 surrounding the outer periphery of the magnet assembly 12. The second coil 17 and the magnet assembly 12 are spaced apart in the radial direction RD and at least partially overlap in the axial direction AD. That is, the orthogonal projections of the second coil 17 and the magnet assembly 12 onto a reference plane perpendicular to the radial direction RD at least partially overlap. Based on this, when a second excitation signal is input to the transducer device 10 in an operating state, the energized second coil 17 generates a second ampere force in the magnetic field formed by the magnet assembly 12, which moves the second coil 17 and the magnet assembly 12 relative to each other, and further converts the second excitation signal into a corresponding mechanical vibration. This configuration allows the first coil 11 to utilize not only the magnetic field inside the magnet assembly 12 but also the magnetic field outside the magnet assembly 12, thereby improving the magnetic field utilization efficiency of the magnet assembly 12. 18 to 21, the specific structures and relationships of the structural members such as the first coil 11, the magnet assembly 12, the first vibration transmission sheet 13, the first bracket 14, the first magnetic flux conduction member 15, and the buffer member 16 can all be adaptively adjusted according to actual needs, and for details, please refer to the relevant description of any one of the embodiments shown in Figures 1 to 17, and the description will be omitted here. For convenience of explanation, the technical means shown in Figure 8 or Figure 9 is taken as the basic structure of the transducer device 10.

[0101] In some embodiments, the first excitation signal and the second excitation signal may be the same, for example, by connecting the second coil 17 and the first coil 11 in series with each other, the second ampere force and the first ampere force can be in the same direction, which helps improve the sensitivity of the transducer device 10. Since the direction of the magnetic field inside the magnet assembly 12 can be easily considered to be opposite to the direction of the magnetic field outside the magnet assembly 12, when the second coil 17 and the first coil 11 are connected in series with each other, the winding directions of the second coil 17 and the first coil 11 may accordingly be opposite. Of course, in some other embodiments, the second coil 17 and the first coil 11 may be connected in parallel with each other.

[0102] In some embodiments, the first excitation signal may be different from the second excitation signal. This configuration helps broaden the application scenarios of the transducer device 10, such as AR / VR application scenarios. Specifically, one of the first coil 11 and the second coil 17 receives an excitation signal such as a video signal or a music signal to allow the user to enjoy an auditory feast, while the other receives an excitation signal such as vibration feedback to provide a tactile experience or alert the user to incoming information while the user is enjoying a rich auditory experience.

[0103] In some embodiments, the second coil 17 and the first coil 11 may be installed to maintain a relatively fixed state, for example, the transducer device 10 includes a second bracket 18 for connecting the first coil 11 and the second coil 17. The second coil 17 may be connected to the second bracket 18 via a medium such as an adhesive, the first coil 11 may be connected to the first bracket 14 via a medium such as an adhesive, and the first bracket 14 and the second bracket 18 may be connected by a method such as insertion.

[0104] In some embodiments, the transducer device 10 may include a second magnetic flux conducting member 19, at least a portion of which surrounds the outer periphery of the second coil 17 and at least partially overlaps with the magnet assembly 12 in the axial direction AD, i.e., the orthogonal projections of the second magnetic flux conducting member 19 and the magnet assembly 12 onto a reference plane perpendicular to the radial direction RD at least partially overlap, thereby making the magnetic flux lines of the magnetic field generated by the magnet assembly 12 more concentrated and passing more through the second coil 17, i.e., reducing leakage magnetic flux and helping to improve the sensitivity of the transducer device 10. Furthermore, since the direction of the magnetic field inside the magnet assembly 12 and the direction of the magnetic field outside the magnet assembly 12 can be simply considered to be opposite, the directions of the currents in the first coil 11 and the second coil 17 may accordingly be opposite, and accordingly, the first inductance generated in the first magnetic flux conducting member 15 by the energized first coil 11 can be at least partially canceled out by the second inductance generated in the first magnetic flux conducting member 15 by the energized second coil 17, thereby reducing the total inductance and helping to improve the acoustic expression of the transducer device 10 in the high frequency band.

[0105] 18 and 19, the second magnetic flux conducting member 19 and the magnet assembly 12 may be installed to maintain a relatively fixed state, with at least a portion of the second magnetic flux conducting member 19 spaced apart from the second coil 17 in the radial direction RD. Installing the second magnetic flux conducting member 19 in this manner allows the second magnetic flux conducting member 19 to move relative to the second coil 17 in conjunction with the magnet assembly 12, which helps to improve the sensitivity of the transducer device 10.

[0106] In some embodiments, the second magnetic flux conducting member 19 may include a second body portion 191 and a second extension portion 192 connected to the second body portion 191, the second body portion 191 having a hollow structure, the second extension portion 192 extending inward from the second body portion 191 along the radial direction RD, the second body portion 191 surrounding the outer periphery of the second coil 17 and spaced apart from the second coil 17 in the radial direction RD, and the second extension portion 192 connected to the magnet assembly 12 and spaced apart from the second coil 17 in the axial direction AD. The entire second magnetic flux conducting member 19 may have magnetic flux conducting capabilities; for example, the second body portion 191 and the second extension portion 192 are both made of a soft magnetic material. The second magnetic flux conducting member 19 may partially have magnetic flux conducting capability, for example, the second main body portion 191 and the second extension portion 192 are made of a soft magnetic material and a plastic material, respectively. Furthermore, the second main body portion 191 and the second extension portion 192 may be an integrally molded structural member.

[0107] 20 and 21, the second magnetic flux conducting member 19 and the second coil 17 may be installed to maintain a relatively fixed state. By installing them in this manner, the second magnetic flux conducting member 19 can move relative to the magnet assembly 12, following the movement of the second coil 17, which not only helps to simplify the structure of the second magnetic flux conducting member 19 but also helps to further improve (and ultimately eliminate) sound leakage from the transducer device 10 due to the cavity sound effect.

[0108] In some embodiments, the distance in the radial direction RD between the second coil 17 and the second magnetic flux conducting member 19 may be smaller than the distance in the radial direction RD between the second coil 17 and the magnet assembly 12, for example, the second coil 17 is fixed to the inner wall of the second magnetic flux conducting member 19. By installing in this manner, compared with the technical solutions shown in Figures 18 and 20, the magnetic gap in the radial direction RD between the second magnetic flux conducting member 19 and the magnet assembly 12 in this technical solution is smaller, which helps to improve the sensitivity of the transducer device 10.

[0109] In some embodiments, at least a portion of the second magnetic flux conducting member 19 may be made of a hard magnetic material, for example, the second magnetic flux conducting member 19 includes hard and soft magnetic materials arranged in a stack along the axial direction AD.

[0110] Next, the specific structures and relationships of the second coil 17 and the magnet assembly 12 will be described by way of example. For convenience of description, the technical means shown in FIG. 20 is taken as the basic structure of the transducer device 10. Therefore, after the specific structures and relationships of the second coil 17 and the magnet assembly 12 are determined, the specific structures and relationships of other structural members in the transducer device 10, such as the first coil 11, magnet assembly 12, first vibration transmitting sheet 13, first bracket 14, first magnetic flux conducting member 15, and buffer member 16, can all be adaptively adjusted according to actual needs. For details, please refer to the relevant description of any one of the embodiments shown in FIGS. 1 to 17, and a description thereof will be omitted here.

[0111] In some embodiments, as shown in FIG. 22 , the magnet assembly 12 may include one hard magnetic body 121 and only one second coil 17. The hard magnetic body 121 and the second coil 17 at least partially overlap in the axial direction AD. That is, the orthogonal projections of the hard magnetic body 121 and the second coil 17 onto a reference plane perpendicular to the radial direction RD at least partially overlap. In the circumferential direction around the axial direction AD, the hard magnetic body 121 may have a complete annular structure or may be joined by multiple arc blocks. In the axial direction AD, the hard magnetic body 121 may be joined by multiple hard magnetic bodies with opposite polarities. This arrangement results in a non-uniform magnetic field distribution in the hard magnetic body 121 in three-dimensional space, and the magnetic field strength of the magnetic field generated by the magnet assembly 12 is also non-uniform. For example, the magnetic field strength is stronger at both ends of the hard magnetic body 121 in the axial direction AD than at the center, and most of the second coil 17 corresponds exactly to the center of the hard magnetic body 121. This results in a smaller average value of the magnetic field strength B acting on the second coil 17 in the ampere-force calculation formula F∝BIL.

[0112] 23 , the magnet assembly 12 may include one hard magnetic body 121, and the second coil 17 may include two second subcoils 171 spaced apart in the axial direction AD, where the two second subcoils 171 may be adjacent to both ends of the hard magnetic body 121. The distance in the axial direction AD between the central cross section of the second subcoil 171 (e.g., shown at P4 in FIG. 23 ) and the end face of the hard magnetic body 121 (e.g., shown at P5 in FIG. 23 ) may be equal to or less than half the dimension of the second subcoil 171 in the axial direction AD. Preferably, the central cross section of the second subcoil 171 (e.g., shown at P4 in FIG. 23 ) and the end face of the hard magnetic body 121 (e.g., shown at P5 in FIG. 23 ) are flush with each other in the axial direction AD. By arranging them in this manner, the two second subcoils 171 are each located at a position where the magnetic field strength is high in the magnetic field formed by the magnet assembly 12, which can help improve the average value of the magnetic field strength B and improve the sensitivity of the transducer device 10. It should be noted that the central cross section of the second subcoil 171 (for example, as shown in P4 in FIG. 23) may be a plane on which half the dimension of the second subcoil 171 in the axial direction AD is located, or a plane on which half the number of turns of the second subcoil 171 is located, and a description thereof will be omitted below.

[0113] In some embodiments, the two second sub-coils 171 may be connected in series with each other and may have opposite winding directions. This arrangement allows the direction of the ampere force generated by each of the two second sub-coils 171 to remain the same. Of course, in other embodiments, the two second sub-coils 171 may be connected in parallel with each other.

[0114] In some embodiments, the magnet assembly 12 may include two soft magnetic bodies 122, each connected to two end surfaces of the hard magnetic body 121, so that the magnetic flux lines of the magnetic field generated by the magnet assembly 12 are more concentrated and pass through the first coil 11 more, i.e., leakage magnetic flux is reduced, which helps to improve the sensitivity of the transducer device 10. The distance in the axial direction AD between the central cross section of the second subcoil 171 (e.g., shown at P4 in FIG. 23 ) and the central cross section of the soft magnetic body 122 (e.g., shown at P6 in FIG. 23 ) may be equal to or less than half the dimension in the axial direction AD of the second subcoil 171. Preferably, the central cross section of the second subcoil 171 (e.g., shown at P4 in FIG. 23 ) and the central cross section of the soft magnetic body 122 (e.g., shown at P6 in FIG. 23 ) are flush with each other in the axial direction AD. By arranging them in this manner, the two second sub-coils 171 are located at positions where the magnetic field strength is high in the magnetic field formed by the magnet assembly 12, which can help improve the average value of the magnetic field strength B and improve the sensitivity of the transducer device 10. It should be noted that the central cross section of the soft magnetic material 122 (for example, as shown in P6 in FIG. 23) may be a plane where half the dimension of the soft magnetic material 122 in the axial direction AD is located, and a description thereof will be omitted below.

[0115] In some embodiments, as shown in Figures 24 to 26, the magnet assembly 12 may include multiple hard magnetic bodies 121 arranged in the axial direction AD, for example, in Figures 24 and 25 there are two hard magnetic bodies 121, and for example, in Figure 26 there are three hard magnetic bodies 121, and any two adjacent hard magnetic bodies 121 are arranged with the same polarities facing each other so that the magnetic field strength at the end of any one hard magnetic body 121 of the magnetic field formed by the magnet assembly 12 is as high as possible. 24, there is one second subcoil 171, for example, in FIG. 25, there are three second subcoils 171, and further, for example, in FIG. 26, there are two second subcoils 171, and at least one of all the second subcoils 171 and two adjacent hard magnetic materials 121 may overlap in the axial direction AD, that is, the orthogonal projections of the at least one second subcoil 171 and the two adjacent hard magnetic materials 121 onto a reference plane perpendicular to the radial direction RD may overlap. By arranging the second subcoil 171 in this manner, the second subcoil 171 is located at a position where the magnetic field strength is high in the magnetic field formed by the magnet assembly 12, which can help improve the average value of the magnetic field strength B and improve the sensitivity of the transducer device 10.

[0116] Furthermore, the magnet assembly 12 may include a plurality of soft magnetic bodies 122, and the plurality of soft magnetic bodies 122 and the plurality of hard magnetic bodies 121 may be arranged alternately in the axial direction AD, so that the magnetic flux lines of the magnetic field generated by the magnet assembly 12 are more concentrated and pass through the second coil 17 more, i.e., the leakage magnetic flux is reduced, which helps to improve the sensitivity of the transducer device 10.

[0117] 24 , the number of hard magnetic bodies 121 may be two, and the second coil 17 may include one second subcoil 171. The second subcoil 171 and the two hard magnetic bodies 121 may overlap in the axial direction AD. That is, the orthogonal projections of the second subcoil 171 and the two adjacent hard magnetic bodies 121 onto a reference plane perpendicular to the radial direction RD may overlap. This allows the second subcoil 171 to be located at a position where the magnetic field strength is high in the magnetic field formed by the magnet assembly 12, thereby improving the average value of the magnetic field strength B and the sensitivity of the transducer device 10. As with the technical solution shown in FIG. 23 , in this technical solution, the distance between the central cross section of the second subcoil 171 and the central cross section of the soft magnetic body 122 in the axial direction AD may be less than half the dimension of the second subcoil 171 in the axial direction AD. Preferably, the central cross sections of the second subcoil 171 and the soft magnetic body 122 are flush with each other in the axial direction AD. By installing them in this manner, the two second sub-coils 171 are located at positions where the magnetic field strength is high in the magnetic field formed by the magnet assembly 12, which can help improve the average value of the magnetic field strength B and improve the sensitivity of the transducer device 10.

[0118] In some embodiments, as shown in Figures 25 and 26, the magnet assembly 12 may include a plurality of hard magnetic bodies 121 arranged in the axial direction AD, and the second coil 17 may include a plurality of second sub-coils 171, and the number of second sub-coils 171 and the number of hard magnetic bodies 121 may not be equal, for example, in Figure 25, there are two hard magnetic bodies 121 and three second sub-coils 171, and also, for example, in Figure 26, there are three hard magnetic bodies 121 and two second sub-coils 171. At least one second subcoil 171 and two adjacent hard magnetic materials 121 may overlap in the axial direction AD, that is, the orthogonal projections of at least one second subcoil 171 and two adjacent hard magnetic materials 121 onto a reference plane perpendicular to the radial direction RD may overlap, thereby allowing each second subcoil 171 to be located at a position where the magnetic field strength is as high as possible in the magnetic field formed by the magnet assembly 12, thereby improving the average value of the magnetic field strength B and the sensitivity of the transducer device 10. As with the technical solution shown in FIG. 23 , in this technical solution, the distance between the central cross section of the second subcoil 171 and the central cross section of the soft magnetic material 122 in the axial direction AD may be equal to or less than half the dimension of the second subcoil 171 in the axial direction AD. Preferably, the central cross sections of the second subcoil 171 and the soft magnetic material 122 are flush with each other in the axial direction AD. By installing in this manner, each of the second sub-coils 171 is located at a position where the magnetic field strength is as high as possible in the magnetic field formed by the magnet assembly 12, which helps to improve the average value of the magnetic field strength B and the sensitivity of the transducer device 10.

[0119] In some embodiments, the multiple second subcoils 171 may be connected in series with each other, and the winding directions of any two adjacent second subcoils 171 may be opposite. By arranging them in this manner, the direction of the ampere force generated by each of the multiple second subcoils 171 can be maintained the same. Of course, in some other embodiments, two second subcoils 171 may be connected in parallel with each other.

[0120] Generally, the smaller the resistance of the second coil 17, the smaller the voltage division, and the transducer device 10 is generally connected to a corresponding power amplifier, and the output efficiency of the power amplifier is proportional to the magnitude of the load connected thereto (e.g., the resistance of the second coil 17). Based on this, if the dimension of the second coil 17 in the axial direction AD is increased, for example, if the number of turns of the second coil 17 is increased, the resistance of the second coil 17 increases, but the average value of the magnetic field strength B decreases accordingly. Therefore, compared to when the number of second coils 17 is only one, or when the second coil 17 includes one second sub-coil 171, when the second coil 17 includes multiple second sub-coils 171 and each of the second sub-coils 171 is positioned as close as possible to the position of the magnetic field formed by the magnet assembly 12 where the magnetic field strength is highest, this not only increases the resistance of the second coil 17 and helps to improve the output efficiency of the power amplifier, but also improves the average value of the magnetic field strength B and the sensitivity of the transducer device 10.

[0121] 13 to 17 and 22 to 26, after the specific structure of the magnet assembly 12 is determined, the specific structures of the first coil 11 and the second coil 17 may be the same or similar. For example, the magnet assembly 12 includes one hard magnetic material 121, and the first coil 11 and the second coil 17 each include two first sub-coils 111 and two second sub-coils 171 spaced apart in the axial direction AD. Also, for example, the magnet assembly 12 includes two hard magnetic bodies 121, and the first coil 11 and the second coil 17 each include one first sub-coil 111 and one second sub-coil 171, and the first sub-coil 111 and the second sub-coil 171 each overlap with the two hard magnetic bodies 121 in the axial direction AD, that is, the orthogonal projections of the first sub-coil 111 and the second sub-coil 171 onto a reference plane perpendicular to the radial direction RD each overlap with the orthogonal projections of the two hard magnetic bodies 121 onto the same reference plane. Further, for example, the magnet assembly 12 includes a plurality of hard magnetic bodies 121 arranged in the axial direction AD, and the first coil 11 and the second coil 17 each include a plurality of first subcoils 111 and a plurality of second subcoils 171, and the number of the first subcoils 111 and the number of the second subcoils 171 are not equal to the number of the hard magnetic bodies 121, but the number of the first subcoils 111 is equal to the number of the second subcoils 171, for example, there are two hard magnetic bodies 121, three first subcoils 111, and three second subcoils 171, or, for example, there are three hard magnetic bodies 121, two first subcoils 111, and two second subcoils 171.

[0122] Based on the above related description, the mechanical vibrations generated by the transducer device 10 may be transmitted to the user via bone conduction, a combination of bone conduction and air conduction, or, of course, air conduction. Generally, compared with bone conduction, air conduction requires the installation of an additional vibrating membrane structure. For convenience of explanation, the following description will be given taking the example of the mechanical vibrations generated by the transducer device 10 being transmitted to the user via bone conduction.

[0123] 27 to 32, the core module 20 may include a core housing 21 and a transducer device 10 installed in an accommodating cavity of the core housing 21. For the specific structure of the transducer device 10, please refer to the relevant description of any one of the embodiments shown in FIGS. 1 to 26, and the description will be omitted here. Furthermore, for convenience of explanation, the technical means shown in FIG. 3 is taken as the basic structure of the transducer device 10.

[0124] 27, the core housing 21 may include a cylindrical side wall 211 and a first end wall 212 and a second end wall 213 connected to both ends of the cylindrical side wall 211, and the transducer device 10 is located between the first end wall 212 and the second end wall 213 and connected to one of the first end wall 212 and the second end wall 213. For example, in any one of the embodiments shown in FIGS. 3 to 17, the first bracket 14 is connected to the first end wall 212, and for example, in any one of the embodiments shown in FIGS. 18 to 26, the second bracket 18 is connected to the first end wall 212. By installing the transducer device 10 in this manner, mechanical vibrations generated by the transducer device 10 may be transmitted to the user via one of the first end wall 212 and the second end wall 213, which is in contact with or abuts against the user's skin. Of course, in some other embodiments, the first coil 11 may be directly connected to one of the first end wall 212 and the second end wall 213, and the magnet assembly 12 is connected to the core housing 21 via the first vibration transmission sheet 13.

[0125] 28 and 29 , the transducer device 10 includes a first coil 11, a magnet assembly 12, a first vibration transmission sheet 13, a first bracket 14, and a second coil 17, where the magnet assembly 12 surrounds the outer periphery of the first coil 11, the second coil 17 surrounds the outer periphery of the magnet assembly 12, the first coil 11 is connected to the first bracket 14, and the first bracket 14 is connected to the magnet assembly 12 via the first vibration transmission sheet 13. The first bracket 14 may include two first end caps 141 spaced apart in the axial direction AD, where one first end cap 141 may be connected to the first end wall 212 and the other first end cap 141 may be connected to the second end wall 213, and the second coil 17 and the core housing 21 are installed to maintain a relatively fixed state. By being placed in this manner, the mechanical vibrations generated by the transducer device 10 may be transmitted to the user via one of the first end wall 212 and the second end wall 213, which is adapted to contact or abut against the user's skin.

[0126] In some embodiments, as shown in FIGS. 30 to 32 , the core module 20 may include a second vibration transmission sheet 22 and a diaphragm panel 23. The transducer device 10 is suspended in the accommodating cavity of the core housing 21 via the second vibration transmission sheet 22, and the diaphragm panel 23 is connected to the transducer device 10. In any one of the embodiments shown in FIGS. 3 to 17 , the diaphragm panel 23 may be connected to the first bracket 14. In any one of the embodiments shown in FIGS. 18 to 26 , the diaphragm panel 23 may be connected to the second bracket 18. By installing the transducer device 10 in this manner, mechanical vibrations generated by the transducer device 10 may be transmitted to the user via the diaphragm panel 23. Furthermore, the specific structure of the second vibration transmission sheet 22 may be the same as or similar to that of the first vibration transmission sheet 13, and therefore, a description thereof will be omitted here. An edge region of the second vibration transmission sheet 22 may be connected to the core housing 21, a central region of the second vibration transmission sheet 22 may be connected to the central region of the first bracket 14, and the central region of the second vibration transmission sheet 22 may be connected to an edge region of the first bracket 14 or the first magnetic flux conducting member 15. It should be noted that, compared with the technical solution shown in Fig. 27 , in this technical solution, the transducer device 10 is suspended in the accommodating cavity of the core housing 21 via the second vibration transmission sheet, so that mechanical vibrations generated by the transducer device 10 can be less transmitted to the core housing 21, which helps to reduce sound leakage of the core module 20.

[0127] In some embodiments, the number of second vibration transmission sheets 22 may be two, and the two second vibration transmission sheets 22 are located on opposite sides of the transducer device 10 in the axial direction AD. By installing in this manner, the transducer device 10 is suspended within the core housing 21 by the two second vibration transmission sheets 22 spaced apart from each other, which reduces the risk of the transducer device 10 shaking during operation and helps the core module 20 operate more smoothly.

[0128] In some embodiments, as shown in FIG. 31 , the core housing 21 may include a cylindrical side wall 211 and an end wall (e.g., a first end wall 212), where the first end wall 212 is connected to one end of the cylindrical side wall 211 and the other end of the cylindrical side wall 211 is open. The core module 20 may include an elastic covering layer 24 connected to the diaphragm panel 23. For example, the elastic covering layer 24 covers the diaphragm panel 23 and is connected to the other end of the cylindrical side wall 211. Furthermore, the hardness of the elastic covering layer 24 may be less than the hardness of the diaphragm panel 23. By installing the core housing 21 in this manner, the open end of the core housing 21 is covered by the elastic covering layer 24, which improves the waterproof and dustproof performance of the core module 20, prevents the transducer device 10 from being pulled out of the core housing 21 in extreme operating conditions such as being dropped, and helps to improve the appearance of the core module 20.

[0129] 32 , the core housing 21 may include a cylindrical side wall 211 and a first end wall 212 and a second end wall 213 connected to both ends of the cylindrical side wall 211, and the transducer device 10 is located between the first end wall 212 and the second end wall 213. A mounting hole 214 is provided in the first end wall 212. Furthermore, the transducer device 10 is located between the first end wall 212 and the second end wall 213, and the diaphragm 23 may include a main body portion 231 and a connecting portion 232 connected to the main body portion 231, and the main body portion 231 is located outside the core housing 21, and the connecting portion 232 is inserted into the core housing 21 through the mounting hole 214 and connected to the transducer device 10. When viewed along the axial direction AD, the area of ​​the main body portion 231 is larger than the area of ​​the mounting hole 214, and the area of ​​the mounting hole 214 is larger than the area of ​​the connecting portion 232. With this arrangement, even if mechanical vibrations generated by the transducer device 10 are transmitted to the core housing 21 via the second vibration transmission sheet 22, the sound leakage generated by the first end wall 212 and the second end wall 213 due to the vibration of the transducer device 10 is out of phase with each other, and the two can cancel each other out in phase in the far field. That is, the core housing 21 itself can reduce sound leakage from the core module 20 based on the principle of acoustic dipole. Therefore, the core housing 21 can have fewer or even no sound leakage reduction holes, which helps improve the waterproof and dustproof performance of the core module 20. For example, the accommodating cavity of the core housing 21 may be connected to the outside of the core module 20 only through a passage, which is a gap between the connecting portion 232 and the wall surface of the mounting hole 214.

[0130] For example, as shown in FIG. 33 , the electronic device 30 may include a support assembly 31 and a core module 20. The support assembly 31 is connected to the core housing 21 and can support the core module 20 so that it is mounted in a wearing position. For the specific structure of the core module 20, please refer to the relevant description of any one of the embodiments shown in FIGS. 27 to 32 , and a detailed description will be omitted here. Furthermore, the support assembly 31 may be, for example, installed in a ring shape and hung around the user's ears, as shown in FIG. 33 (a). For example, as shown in FIG. 33 (b), the support assembly 31 may be configured as an ear-hook or back-hook structure, hung around the user's ears and placed on the back of the head. For example, as shown in FIG. 33 (c), the support assembly 31 may be configured as a head-beam structure and placed on the top of the user's head. Accordingly, the wearing position may be a position in front of the user's ear away from the head or close to the ear on the user's cheek. Therefore, the electronic device 30 may be a terminal device with an audio playback function, such as earphones or smart glasses.

[0131] In some embodiments, electronic device 30 may include a case connected to support assembly 31, and core module 20 may be assembled as a module within the case. By installing in this manner, regardless of how the basic structure of electronic device 30 changes, core module 20, a core structural member, can be assembled as a module and debugged, which improves the versatility of core module 20 and helps reduce the manufacturing cost of electronic device 30.

[0132] The above description is merely a partial example of the present application and is not intended to limit the scope of protection of the present application. Any equivalent device or equivalent process conversion made based on the contents of the specification and drawings of the present application, or direct or indirect application to other related technical fields, is also included in the patent protection scope of the present application. [Explanation of symbols]

[0133] 10a Transducer device 11 First coil 12 Magnet Assembly 12a Magnet Assembly 121a Hard magnetic material 122 Soft magnetic material 122a Magnetic flux conducting plate 13 First vibration transmission sheet 13a Magnetic flux conduction cover 131 Inner ring fixing part 132 Outer ring fixing part 133 Radial section 14 First Bracket 14a Vibration transmission sheet 15 First magnetic flux conducting member 15a Bracket 151 First body part 152 First extension

Claims

1. A transducer device comprising: a first coil; a magnet assembly; and a first vibration transmission sheet connecting the first coil and the magnet assembly, wherein the magnet assembly surrounds the outer periphery of the first coil; the magnet assembly and the first coil are spaced apart in a radial direction of the transducer device and at least partially overlap in an axial direction of the transducer device; and wherein, in an operating state in which a first excitation signal is input to the transducer device, the energized first coil generates a first ampere force in a magnetic field formed by the magnet assembly, which moves the first coil and the magnet assembly relative to each other.

2. 2. The transducer device according to claim 1, wherein no hard magnetic material is provided inside the first coil.

3. 2. The transducer device of claim 1, further comprising a first magnetic flux conducting member, the first coil incorporating an outer periphery of the first magnetic flux conducting member, and the first magnetic flux conducting member and the magnet assembly at least partially overlapping in the axial direction.

4. 4. The transducer device according to claim 3, wherein a ratio of a dimension of the first magnetic flux conducting member in the axial direction to a dimension of the first coil in the axial direction is 1 or greater.

5. 4. The transducer device according to claim 3, wherein the first magnetic flux conducting member is set to have a hollow structure.

6. 6. The transducer device of claim 5, wherein a ratio of the radial dimension of the first magnetic flux conducting member to the radial dimension of the first coil is between 0.5 and 1.

5.

7. 4. The transducer device of claim 3, wherein the first magnetic flux conducting member and the magnet assembly are installed to maintain a relatively fixed state, and at least a portion of the first magnetic flux conducting member is spaced apart from the first coil in the radial direction.

8. 8. The transducer device of claim 7, wherein the first magnetic flux conducting member includes a first main body portion and a first extension portion connected to the first main body portion, the first coil taking up an outer periphery of the first main body portion and spaced apart from the first main body portion in the radial direction, and the first extension portion connected to the magnet assembly and spaced apart from the first coil in the axial direction.

9. The transducer device described in claim 7, characterized in that the first vibration transmission sheet includes an inner ring fixing portion and an outer ring fixing portion that are fitted together, and a plurality of radial portions that connect the inner ring fixing portion and the outer ring fixing portion, the outer ring fixing portion being connected to the magnet assembly, the transducer device including a bracket connected to the first coil, and the inner ring fixing portion being connected to a central region of the bracket or an edge region of the bracket.

10. 4. The transducer device of claim 3, wherein the first magnetic flux conducting member and the first coil are installed to maintain a relatively fixed state, and an orthogonal projection of the first magnetic flux conducting member onto a reference plane perpendicular to the axial direction and an orthogonal projection of the magnet assembly onto the reference plane do not overlap.

11. 11. The transducer device of claim 10, wherein the orthogonal projections of the first coil, the magnet assembly, and the first magnetic flux conducting member onto a reference plane perpendicular to the radial direction at least partially overlap, and the radial distance of the overlapping region between the first magnetic flux conducting member and the magnet assembly is 1.5 times or less than the minimum distance between the first magnetic flux conducting member and the magnet assembly.

12. 11. The transducer device of claim 10, wherein the radial distance between the first coil and the first magnetic flux conducting member is smaller than the radial distance between the first coil and the magnet assembly.

13. The transducer device of claim 10, characterized in that the first vibration transmission sheet includes an inner ring fixing portion and an outer ring fixing portion that are fitted together, and a plurality of radial portions that connect the inner ring fixing portion and the outer ring fixing portion, the outer ring fixing portion being connected to the magnet assembly, and the inner ring fixing portion being connected to the first magnetic flux conduction member.

14. The transducer device described in claim 10, characterized in that the first vibration transmission sheet includes an inner ring fixing portion and an outer ring fixing portion that are fitted together, and a plurality of radial portions that connect the inner ring fixing portion and the outer ring fixing portion, the outer ring fixing portion being connected to the magnet assembly, the transducer device including a bracket connected to the first magnetic flux conduction member, and the inner ring fixing portion being connected to a central region of the bracket or an edge region of the bracket.

15. 15. The transducer device of claim 14, wherein the bracket includes two end caps spaced apart in the axial direction, and the two end caps are respectively connected to both ends of the first magnetic flux conducting member in the axial direction.

16. 11. The transducer device of claim 10, wherein at least a portion of the first magnetic flux conducting member is made of a hard magnetic material.

17. A transducer device described in any one of claims 10 to 16, characterized in that the number of first vibration transmission sheets is two, and the two first vibration transmission sheets are located on opposite sides of the first coil in the axial direction.

18. The transducer device described in claim 17, characterized in that the first vibration transmission sheet includes an inner ring fixing portion and an outer ring fixing portion that are fitted together, and a plurality of radial portions that connect the inner ring fixing portion and the outer ring fixing portion, each of the radial portions extending spirally from the inner ring fixing portion toward the outer ring fixing portion, and when viewed along the axial direction, the spiral direction of the radial portion of one of the first vibration transmission sheets and the spiral direction of the radial portion of the other of the first vibration transmission sheets are opposite to each other.

19. 4. The transducer device of claim 3, wherein the first magnetic flux conducting member and the first coil are installed to maintain a relatively fixed state, the first magnetic flux conducting member includes a first main body portion and a first extension portion connected to the first main body portion, the first coil surrounds the outer periphery of the first main body portion, the first extension portion is spaced apart from the magnet assembly in the axial direction, an orthogonal projection of the first main body portion onto a reference plane perpendicular to the axial direction and an orthogonal projection of the magnet assembly onto the reference plane do not overlap, an orthogonal projection of the first extension portion onto the reference plane and an orthogonal projection of the magnet assembly onto the reference plane overlap, and the radial distance between the first main body portion and the magnet assembly is smaller than the axial distance between the first extension portion and the magnet assembly.

20. The transducer device of claim 1, characterized in that the transducer device includes a buffer member installed inside the magnet assembly, the buffer member being located on at least one side of the first coil in the axial direction, and the radial dimension of the buffer member being equal to or greater than half the radial dimension of the first coil.

21. 21. The transducer device of claim 20, further comprising a first magnetic flux conducting member, the first coil encircling the outer periphery of the first magnetic flux conducting member, the first magnetic flux conducting member and the first coil being installed to maintain a relatively fixed state, and the buffer member being fixed to the first magnetic flux conducting member.

22. 2. The transducer device of claim 1, wherein the magnet assembly includes one hard magnetic material, the first coil includes two first sub-coils spaced apart in the axial direction, and the axial distance between a central cross section of the first sub-coil and an end face of the hard magnetic material is less than half the axial dimension of the first sub-coil.

23. 23. The transducer device according to claim 22, wherein the two first sub-coils are connected in series with each other and have opposite winding directions.

24. 23. The transducer device of claim 22, characterized in that the magnet assembly includes two soft magnetic bodies, each connected to two end surfaces of the hard magnetic body, and the axial distance between a central cross section of the first subcoil and a central cross section of the soft magnetic bodies is less than half the axial dimension of the first subcoil.

25. 2. The transducer device of claim 1, wherein the magnet assembly includes a plurality of hard magnetic bodies arranged in the axial direction, any two adjacent hard magnetic bodies are arranged so that the same polarity faces each other, the first coil includes at least one first sub-coil, and at least one of all the first sub-coils and two adjacent hard magnetic bodies overlap in the axial direction.

26. 26. The transducer device of claim 25, wherein the number of the hard magnetic bodies is two, the first coil includes one first sub-coil, and the first sub-coil and the two hard magnetic bodies overlap in the axial direction.

27. 27. The transducer device according to claim 26, wherein the first vibration transmitting sheet is made of a soft magnetic material.

28. 26. The transducer device of claim 25, wherein the first coil includes a plurality of first sub-coils, and the number of the first sub-coils is not equal to the number of the hard magnetic bodies.

29. 29. The transducer device of claim 28, wherein the number of the first sub-coils is smaller than the number of the hard magnetic bodies, any one of the first sub-coils and two adjacent hard magnetic bodies overlap in the axial direction, and the first vibration transmission sheet is made of a soft magnetic material.

30. 29. The transducer device according to claim 28, wherein the first sub-coils are connected in series with each other, and any two adjacent first sub-coils have opposite winding directions.

31. 26. The transducer device of claim 25, wherein the magnet assembly includes a plurality of soft magnetic bodies, and the plurality of soft magnetic bodies and the plurality of hard magnetic bodies are arranged alternately in the axial direction.

32. 2. The transducer device of claim 1, further comprising a second coil surrounding the outer periphery of the magnet assembly, the second coil and the magnet assembly being spaced apart in the radial direction and at least partially overlapping in the axial direction, and wherein, in an operating state in which a second excitation signal is input to the transducer device, the energized second coil generates a second ampere force in the magnetic field that moves the second coil and the magnet assembly relative to each other.

33. 33. The transducer device of claim 32, wherein the second coil and the first coil are installed to maintain a relatively fixed state.

34. 33. The transducer device of claim 32, wherein the second coil and the first coil are connected in series with each other.

35. 33. The transducer apparatus of claim 32, further comprising a second magnetic flux conducting member, at least a portion of the second magnetic flux conducting member encircling an outer periphery of the second coil and at least partially overlapping the magnet assembly in the axial direction.

36. 36. The transducer device of claim 35, wherein the second magnetic flux conducting member and the magnet assembly are installed to maintain a relatively fixed state, and at least a portion of the second magnetic flux conducting member is spaced apart from the second coil in the radial direction.

37. 37. The transducer device of claim 36, wherein the second magnetic flux conducting member includes a second main body portion and a second extension portion connected to the second main body portion, the second main body portion having a hollow structure, the second main body portion enclosing an outer periphery of the second coil and spaced apart from the second coil in the radial direction, and the second extension portion connected to the magnet assembly and spaced apart from the second coil in the axial direction.

38. 36. The transducer device of claim 35, wherein the second magnetic flux conducting member and the second coil are installed to maintain a relatively fixed state.

39. 39. The transducer device of claim 38, wherein the radial distance between the second coil and the second magnetic flux conducting member is less than the radial distance between the second coil and the magnet assembly.

40. 36. The transducer apparatus of claim 35, wherein at least a portion of the second magnetic flux conducting member is made of a hard magnetic material.

41. 33. The transducer device of claim 32, wherein the magnet assembly includes one hard magnetic material, the second coil includes two second sub-coils spaced apart in the axial direction, and the axial distance between a central cross section of the second sub-coil and an end face of the hard magnetic material is less than half the axial dimension of the second sub-coil.

42. 42. The transducer device of claim 41, wherein the two second sub-coils are connected in series with each other and have opposite winding directions.

43. 42. The transducer device of claim 41, characterized in that the magnet assembly includes two soft magnetic bodies, each connected to two end surfaces of the hard magnetic body, and the axial distance between the central cross section of the second subcoil and the central cross section of the soft magnetic bodies is less than half the axial dimension of the second subcoil.

44. 33. The transducer device of claim 32, wherein the magnet assembly includes a plurality of hard magnetic bodies arranged in the axial direction, any two adjacent hard magnetic bodies are arranged so that the same polarity faces each other, the second coil includes at least one second sub-coil, and at least one of all the second sub-coils and two adjacent hard magnetic bodies overlap in the axial direction.

45. 45. The transducer device of claim 44, wherein the number of the hard magnetic bodies is two, the second coil includes one second sub-coil, and the second sub-coil and the two hard magnetic bodies overlap in the axial direction.

46. 45. The transducer apparatus of claim 44, wherein the second coil includes a plurality of second sub-coils, and the number of the second sub-coils is not equal to the number of the hard magnetic materials.

47. 47. The transducer apparatus of claim 46, wherein the second sub-coils are connected in series with each other, and any two adjacent second sub-coils have opposite winding directions.

48. 45. The transducer device of claim 44, wherein the magnet assembly includes a plurality of soft magnetic bodies, and the plurality of soft magnetic bodies and the plurality of hard magnetic bodies are arranged alternately in the axial direction.

49. 45. The transducer device of claim 44, wherein the second excitation signal is different from the first excitation signal.

50. A core module comprising a core housing and a transducer device according to any one of claims 1 to 49, characterized in that the transducer device is installed in a receiving cavity of the core housing.

51. 51. A core module as described in claim 50, characterized in that it includes a second vibration transmission sheet and a vibration panel, the transducer device being suspended within the accommodating cavity via the second vibration transmission sheet, and the vibration panel being connected to the transducer device.

52. 52. The core module of claim 51, wherein the number of the second vibration transmission sheets is two, and the two second vibration transmission sheets are located on opposite sides of the transducer device in the axial direction.

53. 52. The core module of claim 51, wherein the core housing includes a cylindrical side wall and an end wall, the end wall being connected to one end of the cylindrical side wall and the other end of the cylindrical side wall being open, and the core module includes an elastic covering layer connected to the diaphragm panel, the elastic covering layer being connected to the other end of the cylindrical side wall.

54. 52. The core module of claim 51, wherein the core housing includes a cylindrical side wall and a first end wall and a second end wall connected to both ends of the cylindrical side wall, the first end wall having a mounting hole, the transducer device being located between the first end wall and the second end wall, the diaphragm including a main body portion and a connecting portion connected to the main body portion, the main body portion being located outside the core housing, the connecting portion being inserted into the core housing through the mounting hole and connected to the transducer device, and when viewed along the axial direction, the area of ​​the main body portion is larger than the area of ​​the mounting hole, and the area of ​​the mounting hole is larger than the area of ​​the connecting portion.

55. 55. The core module of claim 54, wherein the receiving cavity communicates with the exterior of the core module only through a passage that is a gap between the connecting portion and the wall surface of the mounting hole.

56. 56. An electronic device comprising: a support assembly; and a core module according to any one of claims 50 to 55, wherein the support assembly is connected to the core housing and supports the core module so as to be mounted in a mounting position.

57. 57. The electronic device of claim 56, including a case connected to the support assembly, the core module being assembled as a module within the case.

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