Transducer device

Abstract

The present application relates to a transducer device, comprising: a first magnetic circuit assembly, which comprises a dynamic component and a static component, the dynamic component comprising a first magnet, and the static component comprising a magnetic conductor that at least partially surrounds the first magnet; a voice coil assembly; and a spring plate assembly, which is configured to connect the dynamic component and the static component and allow the dynamic component to move in a first direction relative to the static component, the first direction being the direction parallel to the axis of the voice coil assembly. The circumferential side wall of the magnetic conductor is provided with at least one demagnetizing hole; in a second direction, the projection of the voice coil assembly on the inner side surface of the magnetic conductor facing the first magnet is staggered from the port of the at least one demagnetizing hole on said inner side surface of the magnetic conductor, the second direction being the direction perpendicular to the axis of the voice coil assembly.

Description

A transducer Cross-references

[0001] This specification claims priority to Chinese application No. 202411844311.6, filed on December 13, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This specification relates to the field of acoustic technology, and in particular to a transducer. Background Technology

[0003] With the development of acoustic output technology, loudspeakers have been widely used in people's daily lives. They can be used with electronic devices such as mobile phones and computers to provide users with an auditory feast. In order to ensure that the loudspeaker has good output performance across the entire frequency range, it is generally necessary to design the loudspeaker's vibration structure so that the loudspeaker has strong driving force while having a resonant frequency in the mid-low frequency range. This allows the loudspeaker to have high sensitivity while also having good output performance in the mid-low frequency range. Summary of the Invention

[0004] One embodiment of this specification provides a transducer, comprising: a first magnetic circuit assembly including a dynamic component and a static component, the dynamic component including a first magnet, the static component including a magnetic conductor at least partially surrounding the first magnet; a voice coil assembly fixed to the static component, the voice coil assembly being at least partially located in the magnetic gap between the first magnet and the magnetic conductor, the dynamic component being movable relative to the voice coil assembly and the static component, the voice coil assembly including at least one voice coil; and a spring assembly configured to connect the dynamic component and the static component, allowing the dynamic component to move relative to the static component in a first direction, the first direction being a direction parallel to the axis of the voice coil assembly; wherein, at least one demagnetizing hole is provided on the circumferential sidewall of the magnetic conductor, and the projection of the voice coil assembly on the inner side surface of the magnetic conductor facing the first magnet along a second direction is offset from the port of the at least one demagnetizing hole on the inner side surface of the magnetic conductor, the second direction being a direction perpendicular to the axis of the voice coil assembly. Attached Figure Description

[0005] This specification will be further described by way of exemplary embodiments, which will be described in detail with reference to the accompanying drawings. These embodiments are not limiting; in these embodiments, the same reference numerals denote the same structures, wherein:

[0006] Figure 1 is a schematic diagram of the structure of a loudspeaker according to some embodiments of this specification;

[0007] Figure 2 is a schematic diagram of the transducer device according to some embodiments of this specification;

[0008] Figure 3 is a schematic diagram showing the overlap of the voice coil assembly and the demagnetizing hole according to some embodiments of this specification;

[0009] Figure 4 is a schematic diagram of the structure of a magnetic circuit assembly according to some embodiments of this specification;

[0010] Figure 5 is a schematic diagram of the magnetoelastic curves of a magnetic conductor with demagnetizing holes of different areas according to some embodiments of this specification.

[0011] Figure 6A is a schematic diagram of the measurement of the first restoring force provided by the spring assembly according to some embodiments of this specification;

[0012] Figure 6B is a schematic diagram of the measurement of the second restoring force provided by the first magnetic circuit assembly according to some embodiments of this specification;

[0013] Figure 7 is a schematic diagram showing the correspondence between different opening areas of the demagnetizing hole and the magnetoelasticity of the magnetic conductor according to some embodiments of this specification;

[0014] Figure 8 is a schematic diagram showing the correspondence between different opening radii of the demagnetizing hole and the magnetoelasticity of the magnetic conductor according to some embodiments of this specification;

[0015] Figure 9 is a schematic diagram showing the relationship between the ratio of the radius of the demagnetizing hole to the height of the magnetic conductor and the magnetoelasticity of the magnetic conductor according to some embodiments of this specification.

[0016] Figure 10 is a schematic diagram showing the relationship between the ratio of the total area of ​​the demagnetizing hole to the area of ​​the outer surface of the magnetic conductor and the magnetoelasticity of the magnetic conductor, according to some embodiments of this specification. Detailed Implementation

[0017] To more clearly illustrate the technical solutions of the embodiments in this specification, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are merely some examples or embodiments of this specification. For those skilled in the art, these drawings can be applied to other similar scenarios without creative effort. It should be understood that these exemplary embodiments are given merely to enable those skilled in the art to better understand and implement this specification, and are not intended to limit the scope of this specification in any way. Unless obvious from the linguistic context or otherwise, the same reference numerals in the figures represent the same structures or operations.

[0018] As indicated in this specification and claims, unless the context clearly indicates otherwise, the words "a," "an," "an," and / or "the" are not specifically singular and may include plural forms. Generally, the terms "comprising" and "including" only indicate the inclusion of expressly identified steps and elements, which do not constitute an exclusive list, and the method or apparatus may also include other steps or elements. The term "based on" means "at least partially based on." The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment."

[0019] In the description of this specification, it should be understood that the terms "front" and "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this specification and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this specification.

[0020] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this specification, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0021] In this specification, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this specification according to the specific circumstances.

[0022] Figure 1 is a schematic diagram of a loudspeaker according to some embodiments of this specification. As shown in Figure 1, some embodiments of this specification provide a loudspeaker 100, which includes a housing 110 and a transducer 120. The transducer 120 is used to vibrate to generate sound and transmit it to the user through the housing 110.

[0023] In some embodiments, the loudspeaker 100 may also be an air-conducting loudspeaker, and correspondingly, the transducer 120 may be an air-conducting transducer. The housing 110 may be provided with a sound outlet (not shown in the figure) that is acoustically coupled to the transducer 120. One end of the transducer 120 in the vibration direction may be connected to the diaphragm. The transducer 120 drives the diaphragm to vibrate and generate air-conducting sound. The air-conducting sound is transmitted to the user's ear canal through the sound outlet, so that the user can receive the air-conducting sound.

[0024] In some embodiments, as shown in FIG1, the speaker 100 can be a bone conduction speaker, and correspondingly, the transducer 120 can be a bone conduction transducer. The housing 110 can include a vibration panel 112 for fitting against the user's face. The transducer 120 is connected to the vibration panel 112. In the wearing state, the vibration panel 112 fits against the face, and the transducer 120 is configured to drive the vibration panel 112 to vibrate so that the vibration panel 112 transmits vibration signals to the human body to generate bone conduction sound.

[0025] In some embodiments, the loudspeaker 100 can be a combined air-bone conduction loudspeaker, and the number of transducers 120 can be one or more. When there is only one transducer 120, the housing 110 can include a vibrating panel 112 and the housing 110 is provided with a sound outlet. The transducer 120 can drive the vibrating panel 112 to vibrate and generate bone conduction sound while simultaneously driving the diaphragm to vibrate. When there are multiple transducers 120, at least one transducer 120 can be an air-conducting transducer that drives the diaphragm to vibrate and generate air-conducting sound, and at least another transducer 120 can be a bone conduction transducer that drives the vibrating panel 112 to vibrate and generate bone conduction sound.

[0026] In some embodiments, the transducer 120 includes a voice coil assembly 130, a first magnetic circuit assembly 140, and a spring assembly 150.

[0027] The first magnetic circuit assembly 140 includes a static component 160 and a dynamic component 170. The dynamic component 170 includes a first magnet 171. The static component 160 includes a magnetic conductor 161 disposed at least partially around the dynamic component 170 (e.g., the first magnet 171). The magnetic conductor 161 is configured to conduct the magnetic field generated by the dynamic component 170 (e.g., the first magnet 171).

[0028] The voice coil assembly 130 is fixed to the static member 160, and the voice coil assembly 130 is at least partially located in the magnetic gap between the static member 160 and the dynamic member 170 (e.g., the magnetic gap formed between the magnetic conductor 161 and the dynamic member 170). The dynamic member 170 is movable relative to the voice coil assembly 130 and the static member 160. The voice coil assembly 130 includes at least one voice coil, and the axis M of the voice coil assembly 130 is aligned with the vibration direction of the transducer 120. In some embodiments, the voice coil assembly 130 may include two voice coils, each at least partially located in a magnetic gap at either end of the vibration direction of the transducer 120.

[0029] The spring assembly 150 is configured to connect the dynamic component 170 and the static component 160, and allows the dynamic component 170 and the static component 160 to move relative to each other in a first direction X, which is parallel to the axis M and is also the vibration direction of the transducer 120. In some embodiments, the static component 160 may be connected to the housing 110. When the transducer 120 is operating, the dynamic component 170 moves relative to the static component 160 and the housing 110, causing the transducer 120 to generate a vibration signal. During the movement of the dynamic component 170 relative to the static component 160, the spring assembly 150 provides a first restoring force to return the dynamic component 170 to its equilibrium position, and the first magnetic circuit assembly 140 (e.g., the static component 160) provides a second restoring force to return the dynamic component 170 to its equilibrium position. The first and second restoring forces give the dynamic component 170 a tendency to return to its equilibrium position. The first restoring force provided by the spring assembly 150 can interact with the second restoring force provided by the first magnetic circuit assembly 140 to jointly adjust the vibration amplitude of the dynamic component 170, thereby adjusting the driving force of the transducer 120 and the output performance of the loudspeaker 100. The balance position refers to the relative position of the dynamic component 170 and the static component 160 when the voice coil assembly 130 is not energized (i.e., the loudspeaker 100 or the transducer 120 is not working). For example, the balance position can be the position where the centerline plane of the dynamic component 170 perpendicular to the first direction X coincides with the centerline plane of the static component 160 perpendicular to the first direction X.

[0030] In some embodiments, one end of the transducer 120 along the vibration direction can be connected to the housing 110 to fix the transducer 120. In some embodiments, both ends of the transducer 120 along the vibration direction can be connected to the housing 110 to fix the transducer 120. In some embodiments, the outer surface of the transducer 120 (e.g., the outer surface of the static component 160 or the outer surface of the magnetic conductor 161) can be connected to the housing 110 to fix the transducer 120.

[0031] To avoid excessive movement of the dynamic component 170, which could cause interference between the dynamic component 170 and other components in the transducer 120 (such as the vibration damper and housing 110), thus affecting the normal operation of the dynamic component 170 or other components in the transducer 120, in some embodiments, the movement distance of the dynamic component 170 relative to the equilibrium position in the first direction X is 0mm-1.0mm. It should be noted that the movement distance of the dynamic component 170 relative to the equilibrium position in the first direction X is 0mm-1.0mm, meaning that the upward movement distance of the dynamic component 170 relative to the equilibrium position along the first direction X does not exceed 1.0mm, and the downward movement distance along the first direction X does not exceed 1.0mm. For example, when the dynamic component 170 moves upward or downward along the first direction X, the distance between its end face near the direction of movement and that end face at the equilibrium position can be 0mm-1.0mm. For example, when the dynamic component 170 moves upward or downward along the first direction X, the distance between the centerline plane of the dynamic component 170 perpendicular to the first direction X and the centerline plane at the equilibrium position can be 0mm-1.0mm. In some embodiments, in order to further avoid interference between the dynamic component 170 and other components, the movement distance of the dynamic component 170 relative to the equilibrium position in the first direction X is 0mm-0.8mm.

[0032] In some embodiments, to reduce the low-frequency resonant frequency (f0) of the transducer 120 and obtain a wider frequency response curve flatter region in the mid-low frequency range, thereby improving the output performance of the loudspeaker 100, the transducer 120 can be designed. For example, through holes can be designed in the static component 160 (e.g., the magnet 161). By reducing the magnetism of the static component 160, the second restoring force provided by the first magnetic circuit assembly 140 to restore the dynamic component 170 to its equilibrium position is reduced, reducing the difficulty for the dynamic component 170 to return to its equilibrium position, thereby increasing the driving force of the transducer 120 and improving the output performance of the loudspeaker 100.

[0033] In some embodiments, the spring assembly 150 allows the dynamic component 170 to vibrate relative to the static component 160 and the housing 110, such that the transducer 120 generates at least one resonant peak in the frequency range of 150Hz-200Hz. For example, the highest low-frequency resonant peak of the speaker 100 in the low-frequency region of the frequency response curve is located in the frequency range of 150Hz-200Hz. That is, the low-frequency region of the output frequency response curve of the speaker 100 (transducer 120) may contain multiple low-frequency resonant peaks. For example, the low-frequency region of the frequency response curve of the speaker 100 (transducer 120) may include a first low-frequency resonant peak, a second low-frequency resonant peak, and a third low-frequency resonant peak. The frequency value of the first low-frequency resonant peak is lower than the frequency value of the second low-frequency resonant peak, and the frequency value of the second low-frequency resonant peak is lower than the frequency value of the third low-frequency resonant peak, wherein at least the frequency value of the third low-frequency resonant peak is in the range of 150Hz-200Hz. For example, the low-frequency region of the frequency response curve of the loudspeaker 100 (transducer 120) may have only one low-frequency resonant peak, the frequency of which is located within 150Hz-200Hz. It should be noted that the frequency range of the low-frequency region of the frequency response curve can be 0Hz-500Hz. In some embodiments, the frequency range of the corresponding low-frequency region can be determined according to actual needs. For example, the low-frequency region may refer to a frequency range from 0Hz to 500Hz. Another example is that the low-frequency range may refer to a frequency range from 20Hz to 400Hz. It should be noted that the values ​​of the frequency range are for illustrative purposes only and are not limitations. The above definition of the frequency range can vary depending on different application scenarios and different classification criteria. For example, in some other application scenarios, the low-frequency range may refer to a frequency range from 150Hz to 500Hz.

[0034] This improves the output performance of the speaker 100 (transducer 120) in the low-frequency range, providing users with a better low-frequency listening experience, while also creating a flatter area in the mid-low frequency range, thereby enhancing the overall output sound quality of the speaker 100.

[0035] Figure 2 is a structural schematic diagram of a transducer device according to some embodiments of this specification; Figure 3 is a schematic diagram of the overlap of a voice coil assembly and a demagnetizing hole according to some embodiments of this specification; and Figure 4 is a structural schematic diagram of a magnetic circuit assembly according to some embodiments of this specification. Referring to Figure 4, in some embodiments, the first magnetic circuit assembly 140 may include a height direction, a long side direction, and a short side direction that are perpendicular to each other. The height direction may be consistent with the vibration direction of the transducer device, i.e., parallel to the first direction X. Both the long side direction and the short side direction are perpendicular to the first direction X; therefore, both the long side direction and the short side direction can be considered as the second direction Y. For ease of distinction, the second direction Y can be defined as including a direction Y1 parallel to the long side direction of the first magnetic circuit assembly 140 and a direction Y2 parallel to the short side direction of the first magnetic circuit assembly 140. In the following description of the second direction Y, directions Y1 and Y2 can be directly substituted.

[0036] Figure 5 is a schematic diagram of the magnetoelastic curves of a magnetic conductor with demagnetizing holes of different areas, according to some embodiments of this specification. Curve L... 51 Curve L represents the magnetoelasticity of the magnetic conductor 161 without the demagnetizing hole 163. 52 Curve L represents the magnetoelasticity of the magnetic conductor 161 with a relatively small total area of ​​demagnetizing hole 163. 53 This represents the magnetoelasticity of the magnetic conductor 161 with a relatively large total area of ​​unmagnetizing holes 163. The magnetoelasticity of the magnetic conductor 161 characterizes the magnitude of the second restoring force provided by the magnetic conductor 161. Using the original surface area of ​​the magnetic conductor 161 without unmagnetizing holes 163 as a reference, curve L... 51 The surface area of ​​the magnetic conductor 161 shown is the same as the original surface area (i.e., no demagnetizing hole 163 is provided), and curve L 52 The surface area of ​​the magnetic conductor 161 is 70% of the original surface area (i.e., the total area of ​​the ports of the demagnetizing hole 163 accounts for 30% of the original surface area), and curve L 53 The surface area of ​​the magnetic conductor 161 shown is 10% of the original surface area (i.e., the total area of ​​the ports of the demagnetizing holes 163 accounts for 90% of the original surface area). It should be noted that the vertical axis shown in Figure 5 represents the ratio of the actual magnetoelasticity of the magnetic conductor 161 with different sized demagnetizing holes 163 to the theoretical magnetoelasticity of the magnetic conductor 161 without demagnetizing holes 163. When the dynamic component 170 (first magnet 171) moves to its maximum displacement in the direction away from the equilibrium position, the actual magnetoelasticity of the magnetic conductor 161 without demagnetizing holes 163 will approach a fixed value, which is the theoretical magnetoelasticity of the magnetic conductor 161 without demagnetizing holes 163. For example, refer to curve L... 51As the horizontal axis gradually increases, the dynamic component 170 (first magnet 171) gradually moves away from the equilibrium position, and the actual magnetoelasticity of the magnetic conductor 161 without the demagnetizing hole 163 gradually increases, and the ratio of the actual magnetoelasticity to the theoretical magnetoelasticity gradually increases. When the horizontal axis is greater than 0.2 mm, the actual magnetoelasticity of the magnetic conductor 161 without the demagnetizing hole 163 approaches a fixed value, which corresponds to the theoretical magnetoelasticity. At this time, the ratio of the actual magnetoelasticity to the theoretical magnetoelasticity approaches 100%.

[0037] As shown in Figure 5, with the same horizontal coordinate (the first magnet 171 moves the same distance from its equilibrium position), curve L... 51 Curve L 52 Curve L 53 The decreasing height (amplitude) indicates that as the total area of ​​the demagnetizing hole 163 increases, the magnetoelasticity of the magnetic conductor 161 gradually decreases. This reduces the second restoring force provided by the first magnetic circuit assembly 140 to restore the dynamic component 170 to its equilibrium position, reducing the difficulty of moving the dynamic component 170. Consequently, this increases the driving force of the transducer 120, lowers the low-frequency resonant frequency (f0) of the transducer 120, and ultimately improves the mid-low frequency output performance of the loudspeaker 100. Referring to Figures 2, 3, and 4, in some embodiments, at least one demagnetizing hole 163 may be provided on the magnetic conductor 161 to improve the mid-low frequency output performance of the loudspeaker 100.

[0038] Referring to Figures 2 and 3, in some embodiments, the projection of the voice coil assembly 130 along the second direction Y onto the inner surface of the magnetic conductor 161 facing the first magnet 171 is offset from the port of at least one demagnetizing hole 163 on the inner surface of the magnetic conductor 161. This reduces the influence of the demagnetizing hole 163 on the magnetic linear density at the voice coil of the voice coil assembly 130, minimizing impact on the driving force of the transducer 120 and ensuring the output performance of the loudspeaker 100. In some embodiments, the projection of the voice coil assembly 130 along the second direction Y onto the inner surface of the magnetic conductor 161 facing the first magnet 171 and the port of at least one demagnetizing hole 163 on the inner surface of the magnetic conductor 161 may also overlap, with the overlapping area not exceeding 40% of the port area of ​​the corresponding demagnetizing hole 163. For example, referring to Figure 3, in the demagnetizing hole 163 shown in Figure 3, region J1 represents the area where the demagnetizing hole 163 overlaps with the voice coil assembly 130, and region J2 represents the area where the demagnetizing hole 163 does not overlap with the voice coil assembly 130. That is, regions J1 and J2 together represent the port of the demagnetizing hole 163 on the inner side of the magnetic conductor 161. The overlapping area does not exceed 40% of the port area of ​​the corresponding demagnetizing hole 163, meaning that the value of J1 / (J1+J2) is less than or equal to 40%. When the area of ​​region J1 is 0, it means that the projection of the voice coil assembly 130 along the second direction Y on the inner side of the magnetic conductor 161 facing the first magnet 171 is misaligned with the port of at least one demagnetizing hole 163 on the inner side of the magnetic conductor 161.

[0039] During the operation of the transducer 120, the further the dynamic component 170 moves from the equilibrium position, the greater the first restoring force provided by the spring assembly 150 and the second restoring force provided by the first magnetic circuit assembly 140 become. By providing a demagnetizing hole 163 on the magnetic conductor 161, the second restoring force provided by the first magnetic circuit assembly 140 that causes the dynamic component 170 to return to the equilibrium position can be effectively reduced. In some embodiments, in the first direction X, when the moving distance of the dynamic component 170 relative to the equilibrium position is 0.1mm-1.0mm, the ratio of the magnitude of the second restoring force provided by the first magnetic circuit assembly 140 to the magnitude of the first restoring force provided by the spring assembly 150 is 0.1-0.8. When the dynamic component 170 just begins to deviate from its equilibrium position (e.g., by 0.1 mm), the total restoring force it experiences, consisting of the first restoring force provided by the spring assembly 150 and the second restoring force provided by the first magnetic circuit assembly 140, is relatively small. This reduces the difficulty of moving the dynamic component 170, allowing the transducer 120 to achieve a higher vibration amplitude. Since the demagnetizing hole 163 is provided on the magnetic conductor 161, the second restoring force provided by the first magnetic circuit assembly 140 is smaller than the first restoring force provided by the spring assembly 150, and the total restoring force is essentially composed of the first restoring force provided by the spring assembly 150. When the moving distance of the dynamic component 170 approaches 1 mm, the total restoring force on the dynamic component 170 increases due to the increase in the first restoring force provided by the spring assembly 150 and the second restoring force provided by the first magnetic circuit assembly 140. This increases the difficulty of moving the dynamic component 170, making it more prone to returning to its equilibrium position. In some embodiments, in the first direction X, when the moving distance of the dynamic component 170 relative to the equilibrium position is 0.1mm-1.0mm, the second restoring force provided by the first magnetic circuit assembly 140 can be opposite to the first restoring force provided by the spring assembly 150. At this time, by designing the opening position, size and number of the demagnetizing holes 163, the second restoring force provided by the first magnetic circuit assembly 140 can be opposite to the first restoring force provided by the spring assembly 150. That is, at this time, the second restoring force points away from the equilibrium position, and the first restoring force points back to the equilibrium position. The total restoring force composed of the first and second restoring forces is reduced, which reduces the difficulty of moving the dynamic component 170, and the transducer 120 can obtain a higher vibration amplitude.

[0040] Figure 6A is a schematic diagram of the measurement of the first restoring force provided by the spring assembly according to some embodiments of this specification, and Figure 6B is a schematic diagram of the measurement of the second restoring force provided by the first magnetic circuit assembly according to some embodiments of this specification.

[0041] As shown in Figure 6A, the spring assembly 150 is clamped or fixed on a fixture (fixed structure), and a force F is applied to the spring assembly 150. The force F required for the spring assembly 150 to produce different displacements is measured using a measuring instrument, thus obtaining the correspondence between the force F and the displacement of the spring assembly 150. Since the spring assembly 150 is in a state of force equilibrium during the test, when the displacement of the spring assembly 150 is x, the restoring force generated by the spring assembly 150 is the same in magnitude as the force F, but in the opposite direction. In the transducer 120, the static component 160 (magnetic conductor 161) can serve as the fixed structure. The spring assembly 150 is connected to the dynamic component 170 (first magnet 171), and the displacement of the spring assembly 150 is the displacement of the dynamic component 170 (first magnet 171). Therefore, based on the correspondence between the force F and displacement of the spring assembly 150, when the displacement of the dynamic component 170 (first magnet 171) is x, the magnitude of the first restoring force generated by the corresponding spring assembly 150 (i.e., the magnitude of the force F) can be determined.

[0042] As shown in Figure 6B, a first magnet 171 is placed inside an energized coil, and a force F is applied to the first magnet 171. The force F required to produce different displacements of the first magnet 171 is measured by a measuring instrument, thus obtaining the correspondence between the force F and the displacement of the first magnet 171. Since the first magnet 171 is in a state of force equilibrium during the test, when the displacement of the first magnet 171 is x, the restoring force on the first magnet 171 is the same in magnitude but opposite in direction to the force F. In the transducer 120, the voice coil assembly 130 can serve as the coil. It should be noted that, although not shown in the figure, it can be understood that a magnetically conductive structure (e.g., the magnetically conductive body 161 of the static component 160) can also be provided on the outer periphery of the coil, and the coil is located within the magnetic gap formed by the magnetically conductive structure and the first magnet 171. Based on the correspondence between the force F and displacement of the first magnet 171, when the displacement of the first magnet 171 is x, the magnitude of the second restoring force (i.e., the magnitude of the force F) provided by the corresponding first magnetic circuit assembly 140 (e.g., static component 160) can be determined.

[0043] In some embodiments, the ratio of the second restoring force F1 provided by the first magnetic circuit assembly 140 or the magnetic conductor 161 with the demagnetizing hole 163 to the second restoring force F0 provided by the first magnetic circuit assembly 140 or the magnetic conductor 161 without the demagnetizing hole 163 is 10%-75%. Specifically, when measuring the second restoring force F1 using the measurement method shown in Figure 6B, the magnetic conductor 161 surrounding the coil is provided with the demagnetizing hole 163; when measuring the second restoring force F0 using the measurement method shown in Figure 6B, the magnetic conductor 161 surrounding the coil is not provided with the demagnetizing hole 163. It should be noted that the ratio of the second restoring force F1 to the second restoring force F0 refers to the ratio of the second restoring force F1 to the second restoring force F0 when the first magnet 171 moves by the same displacement.

[0044] Referring to Figure 4, in some embodiments, at least one demagnetizing hole 163 may include a first demagnetizing hole and a second demagnetizing hole (not shown in the figure) disposed circumferentially at intervals along the magnetic conductor 161. The first demagnetizing hole and the second demagnetizing hole may be located on the same sidewall of the magnetic conductor 161.

[0045] In some embodiments, the opening area of ​​the demagnetizing hole 163 can affect the magnetoelasticity of the magnetic conductor 161, thereby affecting the driving force of the transducer 120. If the opening area of ​​the demagnetizing hole 163 (e.g., the first demagnetizing hole and the second demagnetizing hole) is too large, the magnetism of the magnetic conductor 161 will be weakened significantly, resulting in an insufficient magnetic field strength inside the first magnetic circuit assembly 140 and insufficient driving force of the voice coil assembly 130. If the opening area of ​​the demagnetizing hole 163 is too small, the magnetism of the magnetic conductor 161 will be weakened less, the second restoring force provided by the first magnetic circuit assembly 140 to restore the dynamic component 170 to its equilibrium position will be greater, the movement of the dynamic component 170 will be more difficult, the driving force of the transducer 120 will be insufficient, and the output of the loudspeaker 100 will be affected.

[0046] Figure 7 is a schematic diagram showing the correspondence between different opening areas of the demagnetizing hole 163 and the magnetoelasticity of the magnetic conductor 161 according to some embodiments of this specification. As shown in Figure 7, as the opening area of ​​the demagnetizing hole 163 gradually increases, the magnetoelasticity of the magnetic conductor 161 gradually decreases, and the magnetoelasticity of the magnetic conductor 161 is negatively correlated with the opening area of ​​the demagnetizing hole 163. When the opening area of ​​the demagnetizing hole 163 is 0.10 mm... 2 When left and right (e.g., 0.12mm) 2 The magnetoelasticity of the magnetic conductor 161 is around 750 mN, and the second restoring force provided by the magnetic conductor 161 is relatively large; when the opening area of ​​the demagnetizing hole 163 is 1.5 mm... 2 At that time, the magnetoelasticity of the magnetic conductor 161 is about 430mN, and the magnetism of the magnetic conductor 161 weakens significantly.

[0047] In some embodiments, in order to ensure the output performance of the speaker 100 while improving the user's mid-low frequency listening experience, the opening area of ​​any demagnetizing hole 163 (e.g., the first demagnetizing hole and the second demagnetizing hole) on the outer side of the magnet 161 can be 0.12 mm. 2 -2.00mm 2 In some embodiments, to further enhance the overall output performance of the speaker 100, the area of ​​the port of any demagnetizing hole 163 (e.g., the first demagnetizing hole and the second demagnetizing hole) on the outer side of the magnet 161 is 0.3 mm². 2 -1.5mm 2 .

[0048] In some embodiments, the opening radius of the demagnetizing hole 163 can affect the magnetoelasticity of the magnetic conductor 161, thereby affecting the driving force of the transducer 120.

[0049] Figure 8 is a schematic diagram showing the correspondence between different opening radii of the demagnetizing hole 163 and the magnetoelasticity of the magnetic conductor 161 according to some embodiments of this specification. As shown in Figure 8, as the opening radius of the demagnetizing hole 163 gradually increases, the magnetoelasticity of the magnetic conductor 161 gradually decreases, and the magnetoelasticity of the magnetic conductor 161 is negatively correlated with the opening radius of the demagnetizing hole 163. When the opening radius of the demagnetizing hole 163 is less than 0.2 mm, the magnetoelasticity of the magnetic conductor 161 is greater than 700 mN, and the second restoring force provided by the magnetic conductor 161 is too large; when the opening radius of the demagnetizing hole 163 is greater than 0.7 mm, the magnetoelasticity of the magnetic conductor 161 is less than 450 mN, and the degree of weakening of the magnetism of the magnetic conductor 161 is too large.

[0050] In some embodiments, in order to ensure the output performance of the speaker 100 while improving the user's mid-low frequency listening experience, the opening radius of any demagnetizing hole 163 (e.g., the first demagnetizing hole and the second demagnetizing hole) at the port on the outer side of the magnet 161 is 0.2mm-0.7mm. In some embodiments, in order to further improve the overall output effect of the speaker 100, the opening radius of any demagnetizing hole 163 at the port on the outer side of the magnet 161 is 0.4mm-0.6mm.

[0051] In some embodiments, to ensure that the magnetic conductivity of the magnet 161 is sufficient to allow the magnetic field strength of the first magnetic circuit assembly 140 to return the dynamic component 170 to its equilibrium position, and simultaneously to provide an appropriate second restoring force from the first magnetic circuit assembly 140 to restore the dynamic component 170 to its equilibrium position, the ratio of the area of ​​the port of any demagnetizing hole 163 (e.g., the first demagnetizing hole or the second demagnetizing hole) on the outer side of the magnet 161 to the area of ​​the corresponding outer surface of the magnet 161 is 0.05%-0.08%. In some embodiments, to ensure the overall output performance of the speaker 100, the ratio of the area of ​​the port of any demagnetizing hole 163 on the outer side of the magnet 161 to the area of ​​the outer surface of the magnet 161 is 0.06%-0.07%.

[0052] Figure 9 is a schematic diagram showing the relationship between the ratio of the radius of the demagnetizing hole to the height of the magnetic conductor and the magnetoelasticity of the magnetic conductor according to some embodiments of this specification. As shown in Figure 9, as the ratio of the opening radius of the demagnetizing hole 163 to the height of the magnetic conductor 161 gradually increases, the magnetoelasticity of the magnetic conductor 161 gradually decreases, and the magnetoelasticity of the magnetic conductor 161 is negatively correlated with the magnitude of the aforementioned ratio. When the ratio of the opening radius of the demagnetizing hole 163 to the height of the magnetic conductor 161 is 3.5%, the magnetoelasticity of the magnetic conductor 161 is around 740 mN, and the second restoring force provided by the magnetic conductor 161 is relatively large; when the ratio of the opening radius of the demagnetizing hole 163 to the height of the magnetic conductor 161 is 12.5%, the magnetoelasticity of the magnetic conductor 161 is approximately 430 mN, and the magnetism of the magnetic conductor 161 weakens significantly. It should be noted that the height direction of the magnetic conductor 161 can be consistent with the height direction of the first magnetic circuit assembly 140, and the height of the magnetic conductor 161 is the size of the magnetic conductor 161 in the aforementioned height direction.

[0053] In some embodiments, to ensure the magnetic conductivity of the magnet 161 is suitable, and to ensure that the second restoring force provided by the first magnetic circuit assembly 140, which restores the dynamic component 170 to its equilibrium position, satisfies the requirement of driving the transducer 120 while maintaining sufficient vibration amplitude, the ratio of the opening radius of any demagnetizing hole 163 (e.g., the first demagnetizing hole or the second demagnetizing hole) to the height dimension of the magnet 161 in the first direction X is 3.5%-12.5%. In some embodiments, to ensure the overall output performance of the loudspeaker 100, the ratio of the opening radius of any demagnetizing hole 163 (e.g., the first demagnetizing hole or the second demagnetizing hole) to the height dimension of the magnet 161 in the first direction X is 5%-10%.

[0054] Figure 10 is a schematic diagram illustrating the relationship between the ratio of the total area of ​​the demagnetizing hole 163 to the area of ​​the corresponding outer surface of the magnetic conductor and the magnetoelasticity of the magnetic conductor, according to some embodiments of this specification. As shown in Figure 10, as the ratio of the total area of ​​the demagnetizing hole 163 to the area of ​​the corresponding outer surface of the magnetic conductor 161 gradually increases, the magnetoelasticity of the magnetic conductor 161 gradually decreases, and the magnetoelasticity of the magnetic conductor 161 is negatively correlated with the aforementioned ratio. When the ratio of the total area of ​​the demagnetizing hole 163 to the area of ​​the corresponding outer surface is 0.2%, the magnetoelasticity of the magnetic conductor 161 is around 730 mN, and the second restoring force provided by the magnetic conductor 161 is relatively large; when the ratio of the total area of ​​the demagnetizing hole 163 to the area of ​​the corresponding outer surface is 5%, the magnetoelasticity of the magnetic conductor 161 is approximately 350 mN, and the magnetism of the magnetic conductor 161 weakens significantly. The ratio of the total area of ​​the demagnetizing holes 163 to the area of ​​the outer surface of the magnetic conductor 161 can be the ratio of the total area of ​​the demagnetizing holes provided on one or more of the four outer surfaces corresponding to the long and short sides of the magnetic conductor 161 to the area of ​​the corresponding outer surface. For example, for one outer surface of the magnetic conductor 161, the aforementioned area ratio is the ratio of the total area of ​​all the demagnetizing holes provided on that outer surface to the area of ​​that outer surface. As another example, for the four outer surfaces of the magnetic conductor 161, the aforementioned area ratio is the ratio of the total area of ​​all the demagnetizing holes provided on the four outer surfaces to the sum of the areas of the four outer surfaces.

[0055] In some embodiments, when a plurality of demagnetizing holes 163 are provided on the magnetic conductor 161, the total area of ​​the plurality of demagnetizing holes 163 can affect the second restoring force provided by the first magnetic circuit assembly 140 to restore the dynamic component 170 to its equilibrium position. In order to make the magnetic conductivity of the magnetic conductor 161 suitable, and to ensure that the second restoring force provided by the first magnetic circuit assembly 140 to restore the dynamic component 170 to its equilibrium position satisfies the requirement of driving the transducer 120 while ensuring sufficient vibration amplitude, the ratio of the sum of the areas of the ports of the plurality of demagnetizing holes 163 (e.g., the first demagnetizing hole and the second demagnetizing hole) on the outer side of the magnetic conductor 161 to the area of ​​the outer surface of the magnetic conductor 161 is 0.2%-5%. In some embodiments, in order to ensure the overall output performance of the loudspeaker 100, the ratio of the sum of the areas of the ports of at least one demagnetizing hole 163 on the outer side of the magnetic conductor 161 to the area of ​​the outer surface of the magnetic conductor 161 is 2%-3%.

[0056] Referring to Figure 4, in some embodiments, the cross-sectional shape of the magnetic conductor 161 along the direction perpendicular to the first direction X can be racetrack-shaped or rectangular. The cross-sectional shape of the magnetic conductor 161 can also be any shape including two long sides and two short sides. Two spaced-apart demagnetizing holes 163 (i.e., a first demagnetizing hole and a second demagnetizing hole) can be formed along the long or short side direction of the magnetic conductor 161. These two demagnetizing holes 163 are symmetrical about a plane of symmetry, which passes through the axis M and is parallel to the short or long side direction of the magnetic conductor. For example, the plane of symmetry may include a first plane of symmetry H located at the middle position of the long side portion of the magnetic conductor 161, or a second plane of symmetry (not shown in the figure) located at the middle position of the short side portion of the magnetic conductor 161. That is, the first plane of symmetry H passes through the axis M and is parallel to the short side direction of the magnetic conductor 161, and the second plane of symmetry passes through the axis M and is parallel to the long side direction of the magnetic conductor 161. With the above settings, the influence of the two demagnetizing holes 163 on the magnetic field of the magnetic conductor 161 can be made more uniform, thereby making the magnetic field lines at the voice coil assembly 130 more uniform, thus improving the vibration stability of the voice coil assembly 130 and improving the output quality of the loudspeaker 100.

[0057] In some embodiments, the spring assembly 150 includes a first vibrating plate 151 and a second vibrating plate 152. The first vibrating plate 151 is connected to a first end A of the dynamic component 170 along the first direction X, and the second vibrating plate 152 is connected to a second end B of the dynamic component 170 along the first direction X. The voice coil assembly 130 includes a first voice coil 131 and a second voice coil 132. The first voice coil 131 is at least partially located in the magnetic gap region corresponding to the first end A of the dynamic component 170 along the first direction X, and the second voice coil 132 is at least partially located in the magnetic gap region corresponding to the second end B of the dynamic component 170 along the first direction X. At least one demagnetizing hole 163 may include a first demagnetizing hole, a second demagnetizing hole, a third demagnetizing hole, and a fourth demagnetizing hole. The first and second demagnetizing holes are symmetrical about a first symmetry plane H, and the third and fourth demagnetizing holes are symmetrical about the first symmetry plane H.

[0058] In some embodiments, the first and second demagnetizing holes are located on the first sidewall of the magnetic conductor 161, and the third and fourth demagnetizing holes are located on the second sidewall of the magnetic conductor 161. The first and second sidewalls are opposite each other, for example, the two sidewalls corresponding to the long side of the magnetic conductor 161. Further, the first and third demagnetizing holes are symmetrical about a second symmetry plane, and the second and fourth demagnetizing holes are symmetrical about the second symmetry plane, so that the demagnetizing holes 163 opened on the magnetic conductor 161 are arranged in a centrally symmetrical manner. The demagnetizing holes 163 have a uniform influence on the magnetic conductivity of the magnetic conductor 161, so as to provide a suitable force to the dynamic component 170 and avoid a large deviation of the magnetic field inside the first magnetic circuit assembly 140, which would affect the driving effect of the transducer 120 and thus affect the output effect of the speaker 100.

[0059] In some embodiments, at least one demagnetizing hole 163 includes a plurality of demagnetizing holes 163 spaced apart along the circumference of the magnetic conductor 161 (e.g., the direction of the long side of the magnetic conductor 161, direction Y1). The location of the demagnetizing holes 163 affects the distribution of magnetic field lines inside the magnetic conductor 161, and thus affects the magnetic field line density at the voice coil assembly 130. When multiple demagnetizing holes 163 are concentrated, the magnetic field line distribution at a certain location of the voice coil assembly 130 is significantly affected, while the impact on other areas is smaller, resulting in an uneven magnetic field density on the entire voice coil assembly 130, which affects the driving force of the voice coil assembly 130. In some embodiments, in order to make the magnetic field line density at the voice coil assembly 130 more uniform, the distance from the center of the demagnetizing hole 163 (e.g., the first demagnetizing hole and / or the second demagnetizing hole) to the first symmetry plane H is 0.2 mm to 5.5 mm. In some embodiments, to ensure the output performance of the loudspeaker 100, the distance from the center of the demagnetizing hole 163 (e.g., the first demagnetizing hole and / or the second demagnetizing hole) to the first symmetry plane H is 2mm-4mm. The center of the plurality of demagnetizing holes 163 may be the center of the circumcircle of the plurality of demagnetizing holes 163, or the centroid of the line image connecting the centers of the plurality of demagnetizing holes 163, etc.

[0060] In some embodiments, to reduce the magnetism of the static component 160 (magnetic conductor 161) and the second restoring force provided by the first magnetic circuit assembly 140 to restore the dynamic component 170 to its equilibrium position, without affecting the magnetic field density at the voice coil assembly 130, the interval between any two adjacent demagnetizing holes 163 can be 0.4mm-10.5mm. In some embodiments, to further reduce the magnetism of the static component 160 (magnetic conductor 161) and the second restoring force provided by the first magnetic circuit assembly 140 to restore the dynamic component 170 to its equilibrium position, the interval between any two adjacent demagnetizing holes 163 is 1mm-8mm. The interval between any two adjacent demagnetizing holes 163 can refer to the interval between the centers (or centroids) of the two demagnetizing holes 163, or it can refer to the distance between the two points on the edges of the two demagnetizing holes 163 that are closest to each other.

[0061] In some embodiments, the first magnet 171 is provided with a through hole (not shown in the figure). The through hole can directly reduce the magnetism of the first magnet 171, thereby reducing the overall magnetism of the first magnetic circuit assembly 140, and further reducing the second restoring force provided by the first magnetic circuit assembly 140 to restore the dynamic component 170 to the equilibrium position.

[0062] In some embodiments, the orientation of the through hole may be the same as or different from that of the demagnetizing hole 163.

[0063] In some embodiments, the spring assembly 150 can be connected to the magnetic conductor 161 via a connecting structure (not shown in the figure), the connecting structure extending at least partially into the demagnetizing hole 163. The cooperation between the demagnetizing hole 163 and the connecting structure secures the spring assembly 150, simplifying the structure.

[0064] The basic concepts have been described above. Obviously, for those skilled in the art, the detailed disclosure above is merely illustrative and does not constitute a limitation of this specification. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements, and corrections to this specification. Such modifications, improvements, and corrections are suggested in this specification and therefore remain within the spirit and scope of the exemplary embodiments described herein.

[0065] Furthermore, this specification uses specific terms to describe embodiments thereof. For example, "an embodiment," "one embodiment," and / or "some embodiments" refer to a particular feature, structure, or characteristic associated with at least one embodiment of this specification. Therefore, it should be emphasized and noted that references to "an embodiment," "one embodiment," or "an alternative embodiment" in different locations throughout this specification do not necessarily refer to the same embodiment. Moreover, certain features, structures, or characteristics in one or more embodiments of this specification can be appropriately combined.

[0066] Similarly, it should be noted that, in order to simplify the description disclosed herein and thus aid in the understanding of one or more embodiments of the invention, the foregoing description of embodiments in this specification may sometimes combine multiple features into a single embodiment, drawing, or description thereof. However, this method of disclosure does not imply that the subject matter of this specification requires more features than those mentioned in the claims. In fact, the embodiments contain fewer features than all the features of a single embodiment disclosed above.

[0067] Finally, it should be understood that the embodiments described in this specification are merely illustrative of the principles of the embodiments described herein. Other variations may also fall within the scope of this specification. Therefore, alternative configurations of the embodiments described herein are intended to be illustrative rather than limiting, and are considered consistent with the teachings of this specification. Accordingly, the embodiments described herein are not limited to those explicitly introduced and described herein.

Claims

1. A transducer, comprising: A first magnetic circuit assembly includes a dynamic component and a static component. The dynamic component includes a first magnet, and the static component includes a magnetic conductor disposed at least partially around the first magnet. A voice coil assembly, the voice coil assembly being fixed to the static component and at least partially located in the magnetic gap between the first magnet and the magnetic conductor, the dynamic component being movable relative to the voice coil assembly and the static component, the voice coil assembly comprising at least one voice coil; A spring assembly is configured to connect the dynamic component and the static component, and to allow the dynamic component to move relative to the static component in a first direction, the first direction being a direction parallel to the axis of the voice coil assembly; The magnetic conductor has at least one demagnetizing hole on its circumferential sidewall. The projection of the voice coil assembly onto the inner side of the magnetic conductor facing the first magnet along a second direction is offset from the port of the at least one demagnetizing hole on the inner side of the magnetic conductor. The second direction is perpendicular to the axis of the voice coil assembly.

2. The transducer as described in claim 1, wherein, During the movement of the dynamic component relative to the static component, the spring assembly and the magnetic conductor respectively provide a first restoring force and a second restoring force to restore the dynamic component to its equilibrium position. In the first direction, when the dynamic component moves 0.1mm-1mm relative to the equilibrium position, the ratio of the second restoring force provided by the magnetic conductor to the first restoring force provided by the spring assembly is 0.1-0.

8. The equilibrium position is the position of the dynamic component relative to the static component when the voice coil assembly is not energized.

3. The transducer as described in claim 1 or 2, wherein, The ratio of the sum of the areas of the ports of the at least one demagnetizing hole on the outer side of the magnetic conductor opposite to the first magnet to the area of ​​the outer side of the magnetic conductor is 0.2%-5%.

4. The transducer as described in claim 1 or 2, wherein, The radius of the opening of the at least one demagnetizing hole at the port on the outer side of the magnetic conductor opposite to the first magnet is 0.2mm-0.7mm.

5. The transducer as described in claim 1 or 2, wherein, The at least one demagnetizing hole includes a first demagnetizing hole and a second demagnetizing hole spaced apart circumferentially along the magnetic conductor. The first demagnetizing hole and the second demagnetizing hole are located on the same sidewall of the magnetic conductor, and the area of ​​the port of the first demagnetizing hole and / or the second demagnetizing hole on the outer side of the magnetic conductor opposite to the first magnet is 0.12 mm². 2 -2mm 2 .

6. The transducer as described in claim 5, wherein, The ratio of the area of ​​the port of the first demagnetizing hole and / or the second demagnetizing hole on the outer side of the magnetic conductor to the area of ​​the outer side of the magnetic conductor is 0.05%-0.08%.

7. The transducer as described in claim 5 or 6, wherein, The cross-section of the magnetic conductor perpendicular to the first direction is racetrack-shaped or rectangular. The first demagnetizing hole and the second demagnetizing hole are symmetrical about a symmetrical plane, which passes through the axis of the voice coil assembly and is parallel to the short side or long side of the magnetic conductor.

8. The transducer as claimed in claim 7, wherein, The symmetry plane includes a first symmetry plane, the distance from the center of the first demagnetizing hole and the second demagnetizing hole to the first symmetry plane is 0.2mm-5.5mm, and the first symmetry plane passes through the axis of the voice coil assembly and is parallel to the short side direction of the magnetic conductor.

9. The transducer according to any one of claims 1-8, wherein, The magnetic conductor includes a height dimension in the first direction, and the ratio of the opening radius of any of the at least one demagnetizing holes to the height dimension is 3.5%-12.5%.

10. The transducer as claimed in claim 1 or 2, wherein, The at least one demagnetizing hole includes a plurality of demagnetizing holes spaced apart circumferentially along the magnetic conductor, with the spacing between any two adjacent demagnetizing holes being 0.4mm-10.5mm.

11. The transducer according to any one of claims 1-10, wherein, The spring assembly includes a first vibration-transmitting plate and a second vibration-transmitting plate. The first vibration-transmitting plate is connected to a first end of the dynamic component along the first direction, and the second vibration-transmitting plate is connected to a second end of the dynamic component along the first direction. The voice coil assembly includes a first voice coil and a second voice coil, wherein the first voice coil is at least partially located in the magnetic gap region corresponding to the first end of the dynamic component along the first direction, and the second voice coil is at least partially located in the magnetic gap region corresponding to the second end of the dynamic component along the first direction.

12. The transducer as claimed in claim 11, wherein, The demagnetizing holes include a first demagnetizing hole, a second demagnetizing hole, a third demagnetizing hole, and a fourth demagnetizing hole. The first demagnetizing hole and the second demagnetizing hole are symmetrical about a first symmetry plane, and the third demagnetizing hole and the fourth demagnetizing hole are symmetrical about the first symmetry plane. The first symmetry plane passes through the axis of the voice coil assembly and is parallel to the short side direction of the magnetic conductor.

13. The transducer as claimed in claim 12, wherein, The first and second demagnetizing holes are located on the first sidewall of the magnetic conductor, and the third and fourth demagnetizing holes are located on the second sidewall of the magnetic conductor. The first and second sidewalls are opposite to each other. The first and third demagnetizing holes are symmetrical about a second symmetrical plane, and the second and fourth demagnetizing holes are symmetrical about the second symmetrical plane. The second symmetrical plane passes through the axis of the voice coil assembly and is parallel to the long side of the magnetic conductor.

14. The transducer as claimed in claim 11, wherein, The first and second transducers drive the dynamic component to vibrate relative to the static component, causing the transducer to generate at least one resonance peak in the frequency range of 150Hz-200Hz.

15. The transducer according to any one of claims 1-14, wherein, The spring assembly is connected to the magnetic conductor via a connecting structure, which at least partially extends into the at least one demagnetizing hole.

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