Transducer device and loudspeaker

Abstract

The present description relates to a transducer device and a loudspeaker. The transducer device comprises: a first magnetic circuit assembly, which comprises a dynamic component and a static component, the dynamic component comprising a first magnet and a magnetically conductive plate, and the static component comprising a magnetic conductor that at least partially surrounds the dynamic component; a voice coil assembly, wherein the voice coil assembly is fixed on the static component, and at least part of the voice coil assembly is located in a magnetic gap between the static component and the dynamic component, the dynamic component being capable of moving relative to the voice coil assembly and the static component, and the voice coil assembly at least comprising one voice coil; 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 inner side surface of the magnetic conductor facing the first magnet is provided with at least one protruding portion; the at least one protruding portion is staggered from the voice coil assembly in the first direction, and the at least one protruding portion is magnetically conductive.

Description

A transducer and a loudspeaker 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 and a loudspeaker. 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 and a magnetic guide plate, the static component including a magnetic guide plate at least partially surrounding the dynamic component; a voice coil assembly fixed to the static component, the voice coil assembly being at least partially located in a magnetic gap between the static component and the dynamic component, 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 the magnetic guide plate has at least one protrusion on its inner side facing the first magnet, the at least one protrusion being offset from the voice coil assembly in the first direction, and the at least one protrusion being magnetically conductive.

[0005] One embodiment of this specification also provides a transducer, comprising: a first magnetic circuit assembly including a dynamic component and a static component, the static component being disposed around the dynamic component, the dynamic component including a first magnet; a voice coil assembly fixed to the static component, the voice coil assembly being at least partially located in a magnetic gap between the static component and the dynamic component, 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, and allowing the dynamic component to move relative to the static component in a first direction, the first direction being parallel to the magnetic circuit. The direction of the axis of the voice coil assembly; the auxiliary magnetic circuit assembly, including a second magnet, the second magnet and the first magnet being spaced apart in a second direction, the second direction being a direction perpendicular to the axis of the voice coil assembly; wherein, the magnetic conductor has at least one protrusion on its inner side facing the first magnet, and during the movement of the dynamic component relative to the static component, the spring assembly provides a restoring force to restore the dynamic component to its equilibrium position; the at least one protrusion interacts with the dynamic component to provide a compensating force to cause the dynamic component to deviate from the equilibrium position; the equilibrium position is the position of the dynamic component relative to the static component when the voice coil assembly is not energized.

[0006] One embodiment of this specification also provides a loudspeaker, including the transducer as described above. Attached Figure Description

[0007] 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:

[0008] Figure 1 is a schematic diagram of the structure of a bone conduction loudspeaker according to some embodiments of this specification;

[0009] Figure 2 is a schematic diagram of the transducer device according to some embodiments of this specification;

[0010] Figures 3A and 3B are schematic diagrams showing the positions of dynamic components according to some embodiments of this specification;

[0011] Figure 4 is another structural schematic diagram of the transducer device according to some embodiments of this specification;

[0012] Figure 5 is another structural schematic diagram of the transducer device according to some embodiments of this specification. Detailed Implementation

[0013] 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.

[0014] 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."

[0015] 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.

[0016] 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.

[0017] 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.

[0018] 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.

[0019] 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.

[0020] 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 may include a vibrating panel 112 for conforming to the user's face. The transducer 120 is connected to the vibrating panel 112 and is configured to drive the vibrating panel 112 to vibrate so that the vibrating panel 112 generates bone conduction sound. In the wearing state, the vibrating panel 112 transmits bone conduction sound through the user's face to the user's cochlea, allowing the user to receive bone conduction sound.

[0021] 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.

[0022] In some embodiments, the transducer 120 includes a voice coil assembly 130, a first magnetic circuit assembly 140, and a spring assembly 150.

[0023] 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).

[0024] 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 position of 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.

[0025] 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. In some embodiments, the static component 160 is connected to the housing 110, and the dynamic component 170 can vibrate relative to the static component 160 and the housing 110. 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 tend to make the dynamic component 170 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 regulate the vibration difficulty of the dynamic component 170, thereby regulating the driving force of the transducer 120 and adjusting the output performance of the speaker 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.

[0026] In some embodiments, one end of the transducer 120 in the vibration direction can be connected to the housing 110 to fix the transducer 120. In some embodiments, both ends of the transducer 120 in 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.

[0027] To avoid excessive movement of the dynamic component 170, which could cause interference between the dynamic component 170 and other components (such as the vibration damper, housing 110, etc.) and affect normal use, 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 0mm-1.0mm means that the upward movement distance of the dynamic component 170 relative to the equilibrium position in the first direction X does not exceed 1.0mm, and the downward movement distance in the first direction X does not exceed 1.0mm. In some embodiments, 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.

[0028] In some embodiments, in order to reduce the F0 characteristic resonant frequency of the transducer 120 and improve the output performance of the loudspeaker 100, the transducer 120 can be designed to increase its driving force. For example, a protrusion (e.g., protrusion 190, see FIG. 2) can be designed on the static component 160 (e.g., the magnet 161). The protrusion provides a compensating force that causes the dynamic component 170 to deviate from its equilibrium position, thereby partially offsetting the restoring force provided by the first magnetic circuit assembly 140 and the spring assembly 150 to restore the dynamic component 170 to its equilibrium position. This reduces the difficulty of moving the dynamic component 170 and thus increases the driving force of the transducer 120.

[0029] In some embodiments, the spring assembly 150 allows the dynamic component 170 to vibrate relative to the static component 160 and the housing 110, and this vibration generates at least one resonant peak in the frequency range of 100Hz-200Hz. That is, the output of the loudspeaker 100 (transducer 120) includes at least one resonant peak in the frequency range of 100Hz-200Hz, thereby improving the output of the loudspeaker 100 in the mid-low frequency range (e.g., below 250Hz), giving the loudspeaker 100 better output performance in the mid-low frequency range.

[0030] Figure 2 is a structural schematic diagram of a transducer device according to some embodiments of this specification.

[0031] Referring to Figure 2, in some embodiments, the inner surface of the magnetic conductor 161 opposite to the first magnet 171 is provided with at least one protrusion 190. The at least one protrusion 190 is offset from the voice coil assembly 130 in the first direction X to avoid interference between the protrusion 190 and the voice coil assembly 130. In some embodiments, the protrusion 190 and the magnetic conductor 161 can be an integral structure of the same material, or they can be an assembly structure of the same or different materials. For example, the protrusion 190 can be a magnetically conductive material, integrally formed with the magnetic conductor 161. Another example is that the protrusion 190 can be a magnetically conductive material, assembled to the magnetic conductor 161. Yet another example is that the protrusion 190 can be a magnet, assembled to the magnetic conductor 161.

[0032] In some embodiments, at least one protrusion 190 may abut against the voice coil assembly 130 in the first direction X, so that the protrusion 190 supports the voice coil assembly 130 in the vibration direction (i.e., the first direction X), thereby improving the stability of the voice coil assembly 130. Specifically, one end of the voice coil assembly 130 extending into the magnetic gap may abut against the side surface of the protrusion 190 in the first direction X, as shown in FIG2. In some embodiments, there may also be a gap between the one end of the voice coil assembly 130 extending into the magnetic gap and the side surface of the protrusion 190 in the first direction X.

[0033] In some embodiments, at least one protrusion 190 is magnetically conductive. During the movement of the dynamic component 170 relative to the static component 160, the first magnetic circuit assembly 140 provides a second restoring force to return the dynamic component 170 to its equilibrium position, and the spring assembly 150 provides a first restoring force to return the dynamic component 170 to its equilibrium position. At least one protrusion 190 interacts with the first magnet 171, providing a force that causes the dynamic component 170 to deviate from its equilibrium position. That is, at least one protrusion 190 interacts with the first magnetic circuit assembly 140, providing a compensating force that causes the dynamic component 170 to deviate from its equilibrium position. In this case, the first restoring force provided by the spring assembly 150 can interact with the compensating force provided by at least one protrusion 190 and the magnetically conductive element 161 to jointly adjust the vibration difficulty of the dynamic component 170, thereby adjusting the driving force of the transducer 120, adjusting the F0 characteristic of the transducer 120, and adjusting the output performance of the speaker 100. For more details on the operation of the first magnetic circuit assembly 140 and the protrusion 190, please refer to the following related description.

[0034] Referring to Figure 2, in some embodiments, the dynamic component 170 of the loudspeaker 100 includes a first magnetic plate 121-1 and a second magnetic plate 121-2, which are respectively disposed at both ends of the first magnet 171 along a first direction X. Exemplarily, the first magnetic plate 121-1 may be disposed at the upper end (upper side) of the first magnet 171, and the second magnetic plate 121-2 may be disposed at the lower end (lower side) of the first magnet 171. The first magnetic plate 121-1 and the second magnetic plate 121-2 are used to internally conduct the magnetic field generated by the first magnet 171. At this time, the spring assembly 150 includes a first transducer and a second transducer. The first transducer is connected to a first end of the dynamic component 170 along the first direction X, and the second transducer is connected to a second end of the dynamic component 170 along the first direction X. The voice coil assembly 130 includes a first voice coil and a second voice coil. The first voice coil is at least partially located in the magnetic gap region corresponding to the first end of the dynamic component 170 along the first direction X, and the second voice coil is at least partially located in the magnetic gap region corresponding to the second end of the dynamic component 170 along the first direction X. In some embodiments, when the spring assembly 150 includes only one transducer, the first magnetic circuit assembly 140 may include only one magnetic guide plate 121, and the voice coil assembly 130 may include only one corresponding voice coil.

[0035] Referring to Figure 2, in some embodiments, at least one protrusion 190 may include a first protrusion 191 and a second protrusion 192, which are spaced apart along a first direction X. In the first direction X, both the first protrusion 191 and the second protrusion 192 are located between the first magnetic plate 121-1 and the second magnetic plate 121-2. In the first direction X, the first protrusion 191 is closer to the first magnetic plate 121-1 than the second protrusion 192, and the second protrusion 192 is closer to the second magnetic plate 121-2 than the first protrusion 191. The polarities of the surface of the first magnet 171 facing the first magnetic plate 121-1 (upper side) along the first direction X and the surface of the first protrusion 191 facing the dynamic component 170 along the second direction Y are opposite. Similarly, the polarities of the surface of the first magnet 171 facing the second magnetic plate 121-2 (lower side) along the first direction X and the surface of the second protrusion 192 facing the dynamic component 170 along the second direction Y are opposite. For example, as shown in FIG2, the upper side of the first magnet 171 is the N pole, and the surface of the first protrusion 191 facing the dynamic component 170 along the second direction Y is the S pole; the first protrusion 191 and the upper side of the first magnet 171 attract each other. The lower side of the first magnet 171 is the S pole, and the surface of the second protrusion 192 facing the dynamic component 170 along the second direction Y is the N pole; the second protrusion 192 and the lower side of the first magnet 171 attract each other.

[0036] In some embodiments, the first magnetically conductive plate 121-1 and the second magnetically conductive plate 121-2 disposed at both ends of the first magnet 171 along the first direction X are symmetrical about a first reference plane K. The first reference plane K can be the centerline plane of the first magnet 171 parallel to the second direction Y. In some embodiments, the first protrusion 191 and the second protrusion 192 are also symmetrical about the first reference plane K, such that the distance from the first protrusion 191 to the first magnetically conductive plate 121-1 is the same as the distance from the second protrusion 192 to the second magnetically conductive plate 121-2. That is, the distance from the first protrusion 191 to the upper side of the first magnet 171 is the same as the distance from the second protrusion 192 to the lower side of the first magnet 171. This allows the forces exerted by the first protrusion 191 on the first magnet 171 and the forces exerted by the second protrusion 192 on the first magnet 171 to better cancel each other out, thus keeping the first magnet 171 in a balanced position.

[0037] Referring to Figure 2, when the dynamic component 170 is in the equilibrium position, the first protrusion 191 is closer to the upper side of the first magnet 171 and farther from the lower side of the first magnet 171, providing a downward force along the first direction X on the first magnet 171. The second protrusion 192 is farther from the upper side of the first magnet 171 and closer to the lower side of the first magnet 171, providing an upward force along the first direction X on the first magnet 171. The force exerted by the first protrusion 191 on the first magnet 171 and the force exerted by the second protrusion 192 on the first magnet 171 can cancel each other out, keeping the dynamic component 170 in the equilibrium position.

[0038] Figures 3A and 3B are schematic diagrams showing the positional movement of dynamic components according to some embodiments of this specification.

[0039] Referring to Figures 2 and 3A, when the dynamic component 170 moves downward relative to the static component 160 in the first direction X, as shown in Figure 3A, the distance between the first protrusion 191 and the upper side of the first magnet 171 decreases, and the distance between the first protrusion 191 and the lower side of the first magnet 171 increases. The magnitude of the downward force exerted by the first protrusion 191 on the first magnet 171 in the first direction X increases. Conversely, the distance between the second protrusion 192 and the upper side of the first magnet 171 decreases, and the distance between the second protrusion 192 and the lower side of the first magnet 171 increases. The magnitude of the upward force exerted by the second protrusion 192 on the first magnet 171 in the first direction X decreases. In other words, the resultant force exerted by the first protrusion 191 and the second protrusion 192 on the first magnet 171 in the first direction X downwards is in the same direction as the movement of the dynamic component 170, pointing away from the equilibrium position.

[0040] Referring to Figures 2 and 3B, when the dynamic component 170 moves upward relative to the static component 160 in the first direction X as shown in Figure 3B, the distance between the first protrusion 191 and the upper side of the first magnet 171 increases, and the distance between the first protrusion 191 and the lower side of the first magnet 171 decreases. The magnitude of the downward force exerted by the first protrusion 191 on the first magnet 171 in the first direction X decreases. Conversely, the distance between the second protrusion 192 and the upper side of the first magnet 171 increases, and the distance between the second protrusion 192 and the lower side of the first magnet 171 decreases. The magnitude of the upward force exerted by the second protrusion 192 on the first magnet 171 in the first direction X increases. In other words, the resultant force exerted by the first protrusion 191 and the second protrusion 192 on the first magnet 171 in the first direction X upward is in the same direction as the movement of the dynamic component 170, pointing away from the equilibrium position.

[0041] The size of the protrusion 190 can affect the strength of its magnetism, thereby affecting the force exerted by the protrusion 190 on the first magnet 171, which in turn affects the mobility of the dynamic component 170, the driving force of the transducer 120, and the output performance of the speaker 100. In some embodiments, to ensure that the force exerted by the protrusion 190 on the first magnet 171 is appropriate, at least one protrusion 190 (e.g., the first protrusion 191, the second protrusion 192, the third protrusion 193, etc.) has a height of 0.1mm-0.4mm along the first direction X and a width of 0.1mm-0.5mm along the second direction Y. In some embodiments, to further ensure the output performance of the speaker 100, the height of at least one protrusion 190 along the first direction X can be 0.2mm-0.3mm, and the width along the second direction Y can be 0.3mm-0.4mm.

[0042] The distance between the protrusion 190 and the first magnet 171 in the second direction Y affects the magnitude of the force exerted by the protrusion 190 on the first magnet 171. When the distance is too great, the corresponding force is smaller, and the improvement in the output performance of the speaker 100 is minimal. When the distance is too small, the protrusion 190 may interfere with the first magnet 171, affecting the movement of the first magnet 171. Specifically, the distance between the protrusion 190 and the first magnet 171 in the second direction Y refers to the distance in the second direction Y between the side of the protrusion 190 facing the first magnet 171 along the second direction Y and the side of the first magnet 171 facing the corresponding protrusion 190 along the second direction Y.

[0043] In some embodiments, to improve the output performance of the speaker 100 while ensuring its normal operation, the distance between the side of at least one protrusion 190 facing the first magnet 171 and the side of the magnetic plate 121 facing the magnetic magnet 161 in the second direction Y is 0.2mm-0.6mm. In some embodiments, to further improve the output performance of the speaker 100, the distance between at least one protrusion 190 and the first magnet 171 in the second direction Y is 0.3mm-0.5mm.

[0044] In some embodiments, to improve the output performance of the loudspeaker 100 while ensuring its normal operation, the ratio of the distance between the side of at least one protrusion 190 facing the first magnet 171 and the side of the magnetic plate 121 facing the guide magnet 161, and the distance between the inner side of the magnetic plate 121 and the side of the magnetic plate 121 facing the guide magnet 161 (i.e., the width of the magnetic gap in the second direction Y) is 0.29-0.86. In some embodiments, to further improve the output performance of the loudspeaker 100, the ratio of the distance between the side of at least one protrusion 190 facing the first magnet 171 and the side of the magnetic plate 121 facing the guide magnet 161, and the distance between the inner side of the magnetic plate 161 and the side of the magnetic plate 121 facing the guide magnet 161 (i.e., the width of the magnetic gap in the second direction Y) is 0.4-0.7.

[0045] In some embodiments, to improve the output performance of the loudspeaker 100 while ensuring its normal operation, the ratio of the width of at least one protrusion 190 to the distance between the inner side of the magnetic conductor 161 and the side of the magnetic plate 121 facing the magnetic conductor 161 (i.e., the width of the magnetic gap in the second direction Y) in the second direction Y can be 0.14-0.71. In some embodiments, to further improve the output performance of the loudspeaker 100, the ratio of the width of at least one protrusion 190 to the distance between the inner side of the magnetic conductor 161 and the side of the magnetic plate 121 facing the magnetic conductor 161 (i.e., the width of the magnetic gap in the second direction Y) can be 0.3-0.6.

[0046] If the distance between the protrusion 190 and the corresponding magnetic plate in the first direction X is too small, the voice coil assembly 130 will extend too little into the magnetic gap, resulting in a smaller driving force of the voice coil assembly 130 and affecting the output of the speaker 100. If the distance between the protrusion 190 and the corresponding magnetic plate in the first direction X is too large, the force exerted by the protrusion 190 on the first magnet 171 will be too small, affecting the driving force of the transducer 120 and the output performance of the speaker 100. The distance between the protrusion 190 and the corresponding magnetic plate in the first direction X refers to the distance in the first direction X between the side of the protrusion 190 facing the corresponding magnetic plate and the side of the corresponding magnetic plate facing the first magnet 171; or, the distance in the first direction X between the centerline plane of the protrusion 190 parallel to the second direction Y and the centerline plane of the corresponding magnetic plate parallel to the second direction Y. For example, the distance between the upper side of the first protrusion 191 and the lower side of the first magnetic plate 121-1, or the distance in the first direction X between the centerline surface of the first protrusion 191 parallel to the second direction Y and the centerline surface of the first magnetic plate 121-1 parallel to the second direction Y.

[0047] In some embodiments, to ensure the output performance of the speaker 100, the distance between the first protrusion 191 and the first magnetic plate 121-1 in the first direction X is 1.01mm-1.50mm, and the distance between the second protrusion 192 and the second magnetic plate 121-2 in the first direction X is 1.01mm-1.50mm. In some embodiments, to further improve the output performance of the speaker 100, the distance between the first protrusion 191 and the first magnetic plate 121-1 in the first direction X is 1.2mm-1.3mm, and the distance between the second protrusion 192 and the second magnetic plate 121-2 in the first direction X is 1.2mm-1.3mm.

[0048] If two adjacent protrusions 190 are too close together, they can be approximated as a single protrusion 190. During the movement of the dynamic component 170, in order for the protrusions 190 to provide a compensating force to the dynamic component 170 to offset its deviation from the equilibrium position, the distances between the protrusions 190 and the first magnetic plate 121-1 and the second magnetic plate 121-2 need to have a significant difference to avoid the protrusions 190 canceling each other out on the upper and lower sides of the first magnet 171. That is, the protrusions 190 need to have a large height in the first direction X to ensure a significant difference in the distances between the protrusions 190 and the first magnetic plate 121-1 and the second magnetic plate 121-2. If two adjacent protrusions 190 are too far apart, the distance between the protrusions 190 and the corresponding magnetic plates in the first direction X may be too small, resulting in insufficient insertion of the voice coil assembly 130 into the magnetic gap, leading to a smaller driving force of the voice coil assembly 130 and affecting the output of the speaker 100. The interval between any two adjacent protrusions 190 in the first direction X refers to the distance between two opposite surfaces of the two protrusions 190 in the first direction X.

[0049] In some embodiments, to ensure the output of the speaker 100, the ratio of the spacing between any two adjacent protrusions 190 in the first direction X to the height of the protrusion 190 in the first direction X is 0.1-1. In some embodiments, to further enhance the output of the speaker 100, the ratio of the spacing between any two adjacent protrusions 190 in the first direction X to the height of the protrusion 190 in the first direction X is 0.2-0.8.

[0050] In some embodiments, the first protrusion 191 has a first boss (not shown in the figure) facing the free end of the first magnet 171 along the second direction Y, and the first boss points to the first magnetic plate 121-1 along the first direction X; the second protrusion 192 has a second boss (not shown in the figure) facing the free end of the first magnet 171 along the second direction Y, and the second boss points to the second magnetic plate 121-2 along the first direction X. The presence of the bosses allows the distance between the corresponding protrusion and the corresponding magnetic plate in the first direction X to be smaller, thereby increasing the magnitude of the force exerted by the corresponding protrusion on the first magnet 171, thereby increasing the magnitude of the compensation force provided by the magnetic conductor 161 to the dynamic component 170 for deviation from the balance position, and improving the output performance of the speaker 100.

[0051] Figure 4 is another structural schematic diagram of the transducer device according to some embodiments of this specification. Referring to Figure 4, in some embodiments, at least one protrusion 190 may consist of only a single protrusion disposed between the first magnetic plate 121-1 and the second magnetic plate 121-2, and the single protrusion is symmetrical about the first reference plane K. That is, in this case, the single protrusion can be considered as the case where the interval between the first protrusion 191 and the second protrusion 192 is 0. In some embodiments, in order to enable the single protrusion to provide a compensating force to the dynamic component 170 to deviate from the equilibrium position, the polarity of the side of the single protrusion facing the first magnetic plate 121-1 in the first direction X is opposite to the polarity of the side of the first magnet 171 facing the first magnetic plate 121-1, and the polarity of the side of the single protrusion facing the second magnetic plate 121-2 in the first direction X is opposite to the polarity of the side of the first magnet 171 facing the second magnetic plate 121-2.

[0052] The size of a single protrusion can reflect the strength of its magnetism, thus affecting the force exerted by the protrusion on the first magnet 171, which in turn affects the mobility of the dynamic component 170, the driving force of the transducer 120, and the output performance of the speaker 100. In some embodiments, to ensure that the single protrusion has a suitable magnetic strength so that it provides a suitable compensating force to the dynamic component 170, the width of the single protrusion along the second direction Y is 0.2mm-0.5mm. In some embodiments, to ensure that the single protrusion provides a suitable compensating force to the dynamic component 170, the width of the single protrusion along the second direction Y is 0.3mm-0.4mm.

[0053] The height of a single protrusion along the first direction X can, to some extent, reflect the distance between the single protrusion and the corresponding magnetic plate in the first direction X. This distance affects the magnitude of the compensation force provided by the single protrusion to the dynamic component 170, thereby affecting the movement capability of the dynamic component 170, the driving force of the transducer 120, and the output performance of the speaker 100. In some embodiments, to ensure that the single protrusion provides a suitable compensation force to the dynamic component 170, the thickness of the single protrusion along the first direction X is 0.1mm-1.2mm. In some embodiments, to further guarantee the output performance of the speaker 100, the thickness of the single protrusion along the first direction X is 0.3mm-0.9mm.

[0054] Referring to Figure 2, 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, and the cross-sectional shape of the magnetic conductor 161 can include two long side portions and two short side portions. In some embodiments, each of at least one protrusion 190 includes two independent sub-protrusions, which are respectively disposed on the inner surfaces of the two long sides of the cross-sectional shape of the magnetic conductor 161. The forces exerted by the two sub-protrusions on the dynamic component 170 in the second direction Y can cancel each other out, thereby minimizing the movement of the dynamic component 170 in the second direction Y. With the above arrangement, the overall weight of the transducer 120 can be reduced while the protrusions 190 have strong magnetism, improving the output performance of the speaker 100. In other embodiments, the second magnet (not shown in the figure) may also include four independent sub-protrusions, which can be respectively disposed on the inner surfaces of the two long side portions and the two short side portions of the static component 160, thereby further enhancing the magnetism of the protrusions 190 and improving the output performance of the speaker 100.

[0055] Figure 5 is another structural schematic diagram of the transducer device according to some embodiments of this specification. Referring to Figure 5, in some embodiments, when the dynamic component 170 includes a magnetic guide plate 121, the magnetic guide plate 121 is disposed on the surface of the first magnet 171 along the first direction X, and at least one protrusion 190 may include a first protrusion 191 and a third protrusion 193, which are spaced apart in the first direction X. Furthermore, in the first direction X, the first protrusion 191 and the third protrusion 193 are respectively located on both sides of the magnetic guide plate 121. The polarities of the surface of the first magnet 171 facing the magnetic guide plate 121 along the first direction X and the surface of the first protrusion 191 facing the dynamic component 170 along the second direction Y are opposite, and the first protrusion 191 and the first magnet 171 attract each other. The polarities of the surface of the first magnet 171 facing the magnetic guide plate 121 along the first direction X and the surface of the third protrusion 193 facing the dynamic component 170 along the second direction Y are opposite, and the third protrusion 193 and the first magnet 171 attract each other. For example, as shown in FIG5, the magnetic guide plate 121 is disposed on the upper side of the first magnet 171 along the first direction X, the upper side of the first magnet 171 is the N pole, the surface of the first protrusion 191 facing the dynamic component 170 along the second direction Y is the S pole, and the surface of the third protrusion 193 facing the dynamic component 170 along the second direction Y is the S pole. In some embodiments, the structure and dimensions of the third protrusion 193 may be the same as those of the first protrusion 191. For example, the free end of the third protrusion 193 facing the first magnet 171 along the second direction Y may also be provided with a third boss, and the third boss may point towards the first magnetic plate 121-1 along the first direction X, etc. For more details about the third protrusion 193, please refer to the relevant description of the first protrusion 191, which will not be repeated here.

[0056] When the dynamic component 170 is in the equilibrium position, the direction of the attraction between the first protrusion 191 and the upper side of the first magnet 171 is downward along the first direction X, and the direction of the attraction between the third protrusion 193 and the upper side of the first magnet 171 is upward along the first direction X. The force exerted by the first protrusion 191 on the dynamic component 170 and the force exerted by the third protrusion 193 on the dynamic component 170 can cancel each other out, so that the dynamic component 170 is maintained in the equilibrium position.

[0057] When the dynamic component 170 moves downward relative to the static component 160 in the first direction X, the distance between the first protrusion 191 and the upper side surface of the first magnet 171 decreases, while the distance between the third protrusion 193 and the upper side surface of the first magnet 171 increases. The force exerted by the first protrusion 191 on the dynamic component 170 increases, while the force exerted by the third protrusion 193 on the dynamic component 170 decreases. Since the direction of the force exerted by the first protrusion 191 on the dynamic component 170 is downward along the first direction X, and the direction of the force exerted by the third protrusion 193 on the dynamic component 170 is upward along the first direction X, the resultant force of the first protrusion 191 and the third protrusion 193 on the dynamic component 170 is downward along the first direction X, the same as the direction of movement of the dynamic component 170, pointing in a direction away from the equilibrium position.

[0058] When the dynamic component 170 moves upward relative to the static component 160 in the first direction X, the distance between the first protrusion 191 and the upper side surface of the first magnet 171 increases, while the distance between the third protrusion 193 and the upper side surface of the first magnet 171 decreases. The force exerted by the first protrusion 191 on the dynamic component 170 decreases, while the force exerted by the third protrusion 193 on the dynamic component 170 increases. Since the direction of the force exerted by the first protrusion 191 on the dynamic component 170 is downward along the first direction X, and the direction of the force exerted by the third protrusion 193 on the dynamic component 170 is upward along the first direction X, the direction of the resultant force of the first protrusion 191 and the third protrusion 193 on the dynamic component 170 is upward along the first direction X, the same as the direction of movement of the dynamic component 170, pointing in a direction away from the equilibrium position.

[0059] In some embodiments, when the dynamic component 170 includes a first magnetic plate 121-1 and a second magnetic plate 121-2, both the first magnetic plate 121-1 and the second magnetic plate 121-2 may have a structure similar to that of the magnetic plate 121 shown in FIG. 5. Each of the first magnetic plate 121-1 and the second magnetic plate 121-2 corresponds to two protrusions 190. For example, as shown in FIG. 5, the first magnetic plate 121-1 corresponds to the first protrusion 191 and the third protrusion 193, and the second magnetic plate 121-2 corresponds to the second protrusion 192 and the fourth protrusion 194. The interaction between each magnetic plate and its corresponding two protrusions 190 is similar to or the same as the interaction between the magnetic plate 121 and its corresponding first protrusion 191 and third protrusion 193 shown in FIG. 5, and will not be described again here. For example, the second protrusion 192 may have a second boss at its free end facing the first magnet 171 along the second direction Y, and the second boss points to the second magnetic plate 121-2 along the first direction X; the fourth protrusion 194 may have a fourth boss (not shown in the figure) at its free end facing the first magnet 171 along the second direction Y, and the fourth boss points to the second magnetic plate 121-2 along the first direction X, etc.

[0060] In some embodiments, in the first direction X, the first protrusion 191 and the third protrusion 193 are respectively located on both sides of the first magnetic plate 121-1, and the second protrusion 192 and the fourth protrusion 194 are respectively located on both sides of the second magnetic plate 121-1. When the dynamic component 170 is in the equilibrium position, the first protrusion 191 and the third protrusion 193 are located on one side of the first magnet 171 parallel to the centerline plane in the second direction Y, and the second protrusion 192 and the fourth protrusion 194 are located on the other side of the first magnet 171 parallel to the centerline plane in the second direction Y. In some embodiments, when the first protrusion 191 and the second protrusion 192 are symmetrical about the first reference plane K, the third protrusion 193 and the fourth protrusion 194 can also be symmetrical about the first reference plane K. This makes the distance from the first protrusion 191 to the first magnetic plate 121-1 the same as the distance from the second protrusion 192 to the second magnetic plate 121-2, and the distance from the third protrusion 193 to the first magnetic plate 121-1 the same as the distance from the fourth protrusion 194 to the second magnetic plate 121-2. This allows the forces exerted by the first protrusion 191 and the second protrusion 192 on the first magnet 171 to better cancel each other out, and the forces exerted by the third protrusion 193 and the fourth protrusion 194 on the first magnet 171 to better cancel each other out, so that the first magnet 171 is in a balanced position.

[0061] When the dynamic component 170 moves relative to the static component 160 in the first direction X, the first restoring force provided by the spring assembly 150 prevents the dynamic component 170 from moving further, while the compensating force provided by the protrusion 190 and the magnetic conductor 161 pushes the dynamic component 170 to move further. That is, the force exerted by the protrusion 190 on the dynamic component 170 can cancel out the restoring force provided by the first magnetic circuit assembly 140 (magnetic conductor 161) and the spring assembly 150, reducing the difficulty for the dynamic component 170 to continue moving, thereby indirectly increasing the driving force of the transducer 120 and improving the output performance of the speaker 100.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] 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 a magnetic guide plate, and the static component includes a magnetic guide that at least partially surrounds the dynamic component. 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 static component and the dynamic component, 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 protrusion on its inner side facing the first magnet. The at least one protrusion is offset from the voice coil assembly in the first direction, and the at least one protrusion has magnetic properties.

2. The transducer as described in claim 1, wherein, During the movement of the dynamic component relative to the static component, the spring assembly provides a restoring force to bring the dynamic component back to its equilibrium position; the at least one protrusion cooperates with the magnet to provide a compensating force to cause the dynamic component to deviate from the equilibrium position; 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 magnetic guide plate includes a first magnetic guide plate and a second magnetic guide plate, which are respectively disposed at both ends of the first magnet along the first direction.

4. The transducer as described in any one of claims 1-3, wherein, The height of the at least one protrusion along the first direction is 0.1mm-0.4mm, and / or the width of the at least one protrusion along the second direction is 0.1mm-0.5mm, the second direction being perpendicular to the axis of the voice coil assembly.

5. The transducer as described in claim 4, wherein, In the second direction, the distance between the side of the at least one protrusion facing the first magnet and the side of the magnetic plate facing the magnetic conductor is 0.2mm-0.6mm.

6. The transducer as claimed in claim 4, wherein, In the second direction, the ratio of the distance between the side of the at least one protrusion facing the first magnet and the side of the magnetic plate facing the magnetic material to the distance between the inner side of the magnetic material and the side of the magnetic plate facing the magnetic material is 0.29-0.

86.

7. The transducer as claimed in claim 4, wherein, In the second direction, the ratio of the width of the at least one protrusion to the distance between the inner side surface of the magnetic conductor and the side surface of the magnetic plate facing the magnetic conductor is 0.14-0.

71.

8. The transducer according to any one of claims 4-7, wherein, The ratio of the distance between any two adjacent protrusions in the first direction to the height of the at least one protrusion in the first direction is 0.1-1.

9. The transducer as claimed in claim 3, wherein, The at least one protrusion includes a first protrusion and a second protrusion, the first protrusion and the second protrusion being spaced apart along the first direction; In the first direction, the first protrusion and the second protrusion are located between the first magnetic plate and the second magnetic plate, and the first protrusion is closer to the first magnetic plate than the second protrusion, and the second protrusion is closer to the second magnetic plate than the first protrusion.

10. The transducer as claimed in claim 9, wherein, The polarity of the first magnet toward the first magnetic plate along the first direction is opposite to the polarity of the first protrusion toward the first magnet along the second direction, and the polarity of the first magnet toward the second magnetic plate along the first direction is opposite to the polarity of the second protrusion toward the first magnet along the second direction, wherein the second direction is perpendicular to the axis of the voice coil assembly.

11. The transducer as claimed in claim 9 or 10, wherein, The distance between the centerline plane of the first protrusion parallel to the second direction and the centerline plane of the first magnetic plate parallel to the second direction in the first direction is 1.01mm-1.5mm, and / or, The distance between the centerline plane of the second protrusion parallel to the second direction and the centerline plane of the second magnetic plate parallel to the second direction in the first direction is 1.01mm-1.5mm.

12. The transducer according to any one of claims 9-11, wherein, The first protrusion has a first boss at its free end facing the first magnet along the second direction, and the first boss points towards the first magnetic plate along the first direction. The second protrusion has a second boss at its free end pointing towards the first magnet along the second direction, and the second boss points towards the second magnetic plate along the first direction.

13. The transducer according to any one of claims 1-12, wherein, The magnetic conductor has a racetrack-shaped or rectangular cross-sectional shape perpendicular to the first direction, and any two of the at least one protrusions are respectively disposed on the inner surface of the two opposite long sides of the cross-sectional shape of the magnetic conductor along the circumference of the magnetic conductor.

14. The transducer according to any one of claims 1-13, wherein, The at least one protrusion abuts against the voice coil assembly in the first direction.

15. The transducer according to any one of claims 1-14, wherein, The spring assembly includes a first vibration plate and a second vibration plate. The first vibration plate is connected to a first end of the dynamic component along the first direction, and the second vibration 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. 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.

16. The transducer as claimed in claim 15, wherein, The first and second transducers allow the dynamic component to vibrate relative to the static component, such that the bone conduction loudspeaker has at least one resonant peak in the frequency range of 100Hz-200Hz.

17. The transducer as claimed in claim 2 or 16, wherein, In the first direction, the dynamic component moves no more than 1 mm relative to the equilibrium position.

18. A transducer comprising: A first magnetic circuit assembly includes a dynamic component and a static component, wherein the static component is disposed around the dynamic component, and the dynamic component includes a 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 static component and the dynamic component, 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; An auxiliary magnetic circuit assembly includes a second magnet, which is spaced apart from the first magnet in a second direction, the second direction being a direction perpendicular to the axis of the voice coil assembly; The magnetic conductor has at least one protrusion on its inner side facing the first magnet. During the movement of the dynamic component relative to the static component, the spring assembly provides a restoring force to restore the dynamic component to its equilibrium position. The at least one protrusion interacts with the dynamic component to provide a compensating force to cause the dynamic component to deviate from its equilibrium position. The equilibrium position is the position of the dynamic component relative to the static component when the voice coil assembly is not energized.

19. A loudspeaker comprising the transducer as described in claim 1 or 18.

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