Loudspeaker and electronic device

Abstract

Provided in the present application are a loudspeaker and an electronic device. The loudspeaker comprises a first magnet, a second magnet, a diaphragm, a voice coil and a first upper magnetizer. The first magnet is located on the inner side of the second magnet. The diaphragm is opposite the first magnet and the second magnet and is spaced apart from the first magnet and the second magnet. The voice coil is fixed on the surface of the diaphragm facing the first magnet. The voice coil is spaced apart from the first magnet and the second magnet, and a projection of the voice coil in a first direction overlaps part of the first magnet and / or part of the second magnet, the first direction being the direction of thickness of the loudspeaker. The first upper magnetizer is fixed on the surface of the first magnet facing the diaphragm. The first upper magnetizer is spaced apart from the diaphragm and the voice coil, and the first upper magnetizer is partially located on the inner side of the voice coil. In the present application, the first upper magnetizer is arranged on the inner side of the voice coil in order to converge at the voice coil magnetic induction lines in a magnetic field created by the first magnet and the second magnet, thereby enhancing the magnetic flux density at the voice coil, improving the efficiency of the loudspeaker and improving the treble effect of the loudspeaker.

Description

Speakers and electronic devices

[0001] This application claims priority to the Chinese patent application with application number 202311125548.4 filed with the State Intellectual Property Office of China on August 31, 2023, and priority to the Chinese patent application with the invention name “Speaker and electronic device”, all contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of loudspeakers, and in particular to a loudspeaker and an electronic device. Background Art

[0003] Loudspeakers, also known as horns, are electroacoustic transducers widely used in electronic devices such as speakers, headphones, and mobile phones. Current speakers can be categorized based on their operating principles into dynamic coil speakers, balanced armature speakers, and planar diaphragm speakers. With technological advancements, electronic devices such as headphones are pursuing higher sound quality and often incorporate multiple driver units, combining tweeters and woofers. However, current tweeters generally suffer from poor treble quality and low efficiency, which compromises the sound quality of electronic devices and affects user experience.

[0004] Summary of the Invention

[0005] The embodiments of the present application provide a speaker and an electronic device including the speaker, aiming to provide a speaker and an electronic device with good treble effect and high speaker efficiency.

[0006] In a first aspect, a loudspeaker is provided. The loudspeaker includes a first magnet, a second magnet, a diaphragm, a voice coil, and a first upper magnetic conductor. The first magnet is located on the inner side of the second magnet. The diaphragm is opposite to and spaced apart from the first magnet and the second magnet. The voice coil is fixed to the surface of the diaphragm facing the first magnet. The voice coil is spaced apart from the first magnet and the second magnet, and the projection of the voice coil in the first direction overlaps with part of the first magnet and / or part of the second magnet. The first direction is the thickness direction of the loudspeaker. The first upper magnetic conductor is fixed to the surface of the first magnet facing the diaphragm. The first upper magnetic conductor is spaced apart from the diaphragm and the voice coil, and the first upper magnetic conductor is partially located on the inner side of the voice coil.

[0007] It is understandable that the magnetic circuit components in a typical planar diaphragm loudspeaker can only conduct magnetism through the air so that the magnetic flux lines can pass through the voice coil. Due to the low magnetic permeability of air, it is more difficult for the magnetic flux lines to pass through the air, resulting in a low magnetic induction intensity at the voice coil position, a low efficiency of the planar diaphragm loudspeaker, and a low treble effect of the planar diaphragm loudspeaker. However, the loudspeaker in this embodiment is provided with a first upper magnetic conductor having a magnetic conduction function on the inner side of the voice coil. The first upper magnetic conductor can converge the magnetic flux lines in the magnetic field generated between the first magnet and the second magnet to the voice coil position, thereby effectively increasing the force factor of the magnetic field, enhancing the magnetic induction intensity at the voice coil position, improving the efficiency of the loudspeaker, and enhancing the treble effect of the loudspeaker. Furthermore, compared to typical planar diaphragm speakers, which require increasing the size of the magnet to enhance the magnetic induction intensity at the voice coil, the speaker in this embodiment significantly increases the magnetic induction intensity at the voice coil simply by placing a first upper magnetic conductor inside the voice coil. Furthermore, the first upper magnetic conductor utilizes the space between the diaphragm and the first magnet, allowing it to enhance the magnetic induction intensity at the voice coil without increasing the overall width and thickness of the speaker. In other words, while maintaining the same magnetic induction intensity at the voice coil, the speaker in this embodiment can be made smaller, facilitating a more compact speaker.

[0008] Secondly, in this embodiment, the first upper magnetic conductor is fixedly connected to the first magnet, allowing direct contact between the first upper magnetic conductor and the first magnet, with no gap between them. Thus, after the magnetic flux lines pass through the first magnet, they can be conducted directly through the first upper magnetic conductor without passing through air. The higher magnetic permeability of the first upper magnetic conductor makes it easier for the magnetic flux lines to pass through the first upper magnetic conductor, allowing them to converge more towards the voice coil, thereby increasing the force factor of the magnetic field, improving the magnetic induction intensity at the voice coil, and improving the efficiency of the speaker.

[0009] In one possible implementation, the first upper magnetic conductor has a first width greater than or equal to 0.5 mm. Thus, the first upper magnetic conductor has a certain width so that the first upper magnetic conductor can be fixed to the surface of the first magnet by bonding or other means.

[0010] In one possible implementation, the inner width of the voice coil is a second width. The second width is greater than or equal to 0.6 mm. Thus, the inner space of the voice coil has a certain width, thereby accommodating a first upper magnetic conductor of a certain width. The first upper magnetic conductor can converge the magnetic flux lines in the magnetic field generated between the first and second magnets toward the voice coil, thereby effectively increasing the force factor of the magnetic field, enhancing the magnetic induction intensity at the voice coil, improving the efficiency of the speaker, and enhancing the speaker's treble effect.

[0011] In one possible implementation, the difference between the first width and the second width is greater than or equal to 0.1 mm. This provides a gap between the first upper magnetic conductor and the inner circumferential sidewall of the voice coil, thereby preventing the voice coil from colliding with the first upper magnetic conductor due to deviation along the width of the voice coil during vibration, thereby affecting the acoustic performance of the speaker.

[0012] In one possible implementation, the distance between the inner and outer sidewalls of the voice coil is a third width. The third width is greater than the thickness of the voice coil. Thus, the voice coil is a planar voice coil, which helps improve the treble effect of the speaker.

[0013] In one possible implementation, the winding plane of the voice coil is perpendicular to the first direction. In this way, the voice coil is a planar voice coil, which is beneficial for improving the treble effect of the speaker.

[0014] In one possible implementation, the speaker also includes a second upper magnet. The second upper magnet is fixed to the surface of the second magnet facing the diaphragm. The second upper magnet is located on the side of the voice coil facing away from the first upper magnet. In this way, by providing the second upper magnet, the magnetic flux lines in the magnetic field generated between the first magnet and the second magnet can be further converged to the position of the voice coil, thereby further increasing the force factor of the magnetic field, enhancing the magnetic induction intensity at the position of the voice coil, improving the efficiency of the speaker, improving the output sound quality of the speaker, and enhancing the treble effect of the speaker. At the same time, magnets are provided on both the inside and outside of the voice coil (that is, the first upper magnet and the second upper magnet), so that the magnetic field distribution on both sides of the voice coil is more symmetrical, which is beneficial to improving the acoustic performance of the speaker.

[0015] Furthermore, in this embodiment, the second upper magnetic conductor is fixedly connected to the second magnet, allowing for direct contact between the second upper magnetic conductor and the second magnet, with no gap between them. This allows magnetic flux lines to pass through the second magnet without passing through air. The higher magnetic permeability of the second upper magnetic conductor makes it easier for magnetic flux lines to pass through the second upper magnetic conductor, allowing them to converge more towards the voice coil, increasing the force factor of the magnetic field, boosting the magnetic induction intensity at the voice coil, and ultimately improving speaker efficiency.

[0016] In one possible implementation, the distance between the second upper magnetic conductor and the voice coil is greater than or equal to 0.05 mm. This creates a gap between the second upper magnetic conductor and the outer peripheral sidewall of the voice coil, thereby preventing the voice coil from colliding with the second upper magnetic conductor due to displacement along the width of the voice coil (in this embodiment, the radial direction of the voice coil) during vibration, thereby affecting the acoustic performance of the speaker.

[0017] In one possible implementation, the second upper magnetic conductor has a notch. The voice coil is electrically connected to a power source through the notch. This allows the voice coil and the power source outside the speaker to form a current loop. The power source can transmit a current signal to the voice coil.

[0018] In one possible implementation, the second upper magnetic conductor is provided with a first relief step. The opening of the first relief step is formed on the surface of the second upper magnetic conductor facing the second magnet and on the outer peripheral side of the second upper magnetic conductor. The first relief step communicates with the notch. The loudspeaker also includes a circuit board. At least a portion of the circuit board is located within the first relief step. The voice coil is electrically connected to the circuit board through the notch. The circuit board is electrically connected to a power supply. This allows the circuit board to utilize the thickness of the second upper magnetic conductor, thereby improving the space utilization of the loudspeaker.

[0019] In a possible implementation, the loudspeaker further includes a lower magnetic conductor fixedly connected to a surface of the first magnet facing away from the diaphragm and / or a surface of the second magnet facing away from the diaphragm.

[0020] It is understandable that the speaker in this embodiment also includes a lower magnetic conductor. The lower magnetic conductor is fixed on the side of the first magnet facing away from the voice coil, so as to further enhance the overall magnetic field strength of the magnetic circuit assembly, increase the force factor of the magnetic field, and help improve the efficiency of the speaker. At the same time, under the same magnetic field strength conditions, the speaker in this embodiment enhances the magnetic field strength by setting the lower magnetic conductor, so that the size of the first magnet and / or the second magnet can be made smaller, which is conducive to achieving a miniaturized setting of the entire speaker. Alternatively, under the condition that the overall thickness of the speaker remains unchanged, the lower magnetic conductor can be set by sacrificing part of the thickness of the first magnet and the second magnet, so that the force factor of the magnetic field can be increased without changing the thickness of the speaker, and the magnetic induction intensity at the voice coil position can be increased, thereby improving the efficiency of the speaker.

[0021] In one possible implementation, the diaphragm includes a first vibrating portion and a second vibrating portion. The second vibrating portion is annular. The first vibrating portion is located inside the second vibrating portion and fixedly connected to the second vibrating portion. The voice coil is fixedly connected to the surface of the first vibrating portion facing the first magnet. The first vibrating portion includes a first straight portion and a first folded ring portion. The first straight portion is annular, located inside the first straight portion and fixedly connected to the first straight portion. The first folded ring portion protrudes away from the first magnet relative to the first straight portion. The first straight portion is connected between the second vibrating portion and the first folded ring portion. And / or, the second vibrating portion includes a second straight portion and a second folded ring portion. The second folded ring portion is connected between the second straight portion and the first vibrating portion. The second folded ring portion protrudes away from the first magnet relative to the second straight portion. In this way, the diaphragm has a curved portion (i.e., the first folded ring portion or the second folded ring portion), which helps increase the displacement of the diaphragm in its vibration direction and improves the acoustic performance of the speaker.

[0022] In one possible implementation, the diaphragm includes a first vibrating part and a second vibrating part. The second vibrating part is annular. The first vibrating part is located on the inner side of the second vibrating part and is fixedly connected to the second vibrating part. The first vibrating part includes a first connecting part, a first main body, a second connecting part and a second main body. The first connecting part, the first main body and the second connecting part are all annular. The second main body is located on the inner side of the first connecting part and is fixedly connected to the first connecting part. The second connecting part is located on the outer side of the first connecting part. The first main body is connected between the first connecting part and the second connecting part. The second connecting part is fixedly connected to the second vibrating part. In the first direction, the distance from the first main body to the first magnet is smaller than the distance from the second main body to the first magnet. The voice coil is embedded in the first main body. The surface of the voice coil facing the first magnet is exposed relative to the first main body.

[0023] The inner width of the first connecting portion is a fourth width, which is greater than or equal to 0.6 mm.

[0024] It can be understood that the speaker in this embodiment embeds the voice coil in the first main body part of the diaphragm and sinks the first main body part in the direction close to the first magnet, so that the vibration component can embed the voice coil in the diaphragm while still having space for storing the first upper magnetic conductor on the inner side of the voice coil of the vibration component. Therefore, the first upper magnetic conductor can be set on the inner side of the voice coil to enhance the magnetic induction intensity at the position of the voice coil and improve the efficiency of the speaker.

[0025] In one possible implementation, the loudspeaker further includes a shell. The shell includes a top and a frame. The frame is fixedly connected to the outer periphery of the top. The voice coil, the diaphragm, the first magnet, the second magnet, and the first upper magnetic conductor are all housed on the inner side of the shell. The space between the diaphragm and the top constitutes the front cavity of the loudspeaker. The top includes a first part, a second part, and a transition part. The transition part is connected between the first part and the second part. In the first direction, the distance from the first part to the diaphragm is greater than the distance from the second part to the diaphragm. The first part is provided with a sound outlet, which connects the front cavity with the external space of the loudspeaker.

[0026] It is understandable that, compared to existing speakers, in order to ensure the overall axially symmetrical design of the speaker, the module thickness will remain consistent, that is, the distance from the top of the shell to the diaphragm will be basically the same, so that the thickness of the speaker is limited by the stacking method of the components inside the electronic device. In this embodiment, the top of the speaker shell may include a first part and a second part with two different heights. The first part of the top can be raised relative to the second part. Among them, the second part of the top can be stacked with the internal components of the electronic device in the first direction, and the first part of the top can be raised relative to the second part in the direction toward the internal components. In this way, on the one hand, the volume of the front cavity of the speaker can be increased without affecting the stacking of the internal components of the electronic device; on the other hand, the sound outlet located in the first part of the top can be closer to the sound outlet of the electronic device. In other words, the shell of the speaker in this embodiment can be a variable height shell. By providing a shell with parts of different heights (i.e., the first part and the second part of the top), the volume of the front cavity can be increased without affecting the stacking of internal components of the electronic device, and the sound outlet can be made closer to the sound outlet of the electronic device, so that the speaker can create additional resonance peaks in the high frequency band, improve the sensitivity of the speaker in the high frequency band, and widen the bandwidth of the entire speaker, so that a speaker with better treble effect can be obtained.

[0027] In a second aspect, an electronic device is provided. The electronic device includes a housing and the aforementioned speaker. The speaker is housed inside the housing. The speaker of this embodiment employs a first upper magnetic conductor, which has a magnetic conductivity, disposed inside the voice coil. The first upper magnetic conductor can converge the magnetic flux lines in the magnetic field generated between the first and second magnets toward the voice coil, thereby effectively increasing the force factor of the magnetic field and enhancing the magnetic induction intensity at the voice coil, thereby improving the speaker's efficiency and enhancing the speaker's high-pitched sound. Furthermore, compared to conventional planar diaphragm speakers, which require increasing the size of the magnet to increase the magnetic induction intensity at the voice coil, the speaker of this embodiment significantly increases the magnetic induction intensity at the voice coil simply by disposing the first upper magnetic conductor inside the voice coil. Furthermore, the first upper magnetic conductor utilizes the space between the diaphragm and the first magnet, allowing the first upper magnetic conductor to enhance the magnetic induction intensity at the voice coil without increasing the overall width and thickness of the speaker. In other words, while maintaining the same magnetic induction intensity at the voice coil, the speaker of this embodiment can be made smaller, facilitating a compact speaker design and conserving internal space within the electronic device. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the implementation methods or background technologies of the present application, the drawings required for use in the implementation methods or background technologies of the present application will be described below.

[0029] FIG1a is a schematic structural diagram of an embodiment of an electronic device provided in an embodiment of the present application;

[0030] FIG1b is a schematic cross-sectional view of the electronic device shown in FIG1a taken along line AA in one embodiment;

[0031] FIG2 is a schematic structural diagram of a speaker of the electronic device shown in FIG1b in one embodiment;

[0032] FIG3 is a schematic diagram of the exploded structure of the speaker shown in FIG2 in some embodiments;

[0033] FIG4 is a schematic diagram of the assembly structure of the first magnet, the second magnet, and the lower magnetic conductor shown in FIG3 in one embodiment;

[0034] FIG5 is a partial cross-sectional structural diagram of an embodiment of the loudspeaker shown in FIG2 taken along line BB;

[0035] FIG6 is a schematic structural diagram of a circuit board of the speaker shown in FIG3 ;

[0036] FIG7 is a schematic diagram of an assembled structure of a portion of the loudspeaker shown in FIG3 in one embodiment;

[0037] FIG8 is a schematic diagram of a partial cross-sectional structure of an embodiment of the loudspeaker shown in FIG2 taken along line BB;

[0038] FIG9 is a schematic structural diagram of the second upper magnetic conductor of the speaker shown in FIG3 ;

[0039] FIG10 is a schematic structural diagram of the second upper magnetic conductor shown in FIG9 from another perspective;

[0040] FIG11 is a schematic diagram of an assembled structure of a portion of the loudspeaker shown in FIG3 in one embodiment;

[0041] FIG12 is a schematic cross-sectional view of the speaker shown in FIG2 taken along line BB in one embodiment;

[0042] FIG13 is a schematic diagram of a partial cross-sectional structure of an embodiment of the loudspeaker shown in FIG2 taken along CC;

[0043] FIG14 is a schematic diagram of the exploded structure of the vibration assembly of the speaker shown in FIG3 ;

[0044] FIG15 is a schematic diagram of a partial cross-sectional structure of an embodiment of the speaker shown in FIG2 taken along line BB;

[0045] FIG16a is a schematic structural diagram of the assembly structure of the diaphragm and voice coil shown in FIG14 from another perspective;

[0046] FIG16 b is a top view of the voice coil shown in FIG14 in one embodiment;

[0047] FIG17 is a schematic diagram of a partial cross-sectional structure of an embodiment of the loudspeaker shown in FIG2 taken along line BB;

[0048] FIG18 is a schematic diagram of the assembly structure of the vibration assembly and the magnetic circuit assembly of the loudspeaker shown in FIG3 in one embodiment;

[0049] FIG19 is a schematic diagram of an assembled structure of a portion of the loudspeaker shown in FIG3 in one embodiment;

[0050] FIG20 is a schematic diagram of a partial cross-sectional structure of an embodiment of the speaker shown in FIG2 taken along line BB;

[0051] FIG21 is a schematic diagram of a partial cross-sectional structure of an embodiment of the loudspeaker shown in FIG2 taken along CC;

[0052] FIG22 is a simplified schematic diagram of magnetic field distribution of a voice coil, a first magnet, and a second magnet of a planar diaphragm loudspeaker in some embodiments;

[0053] FIG23 is a simplified schematic diagram of the magnetic field distribution of the voice coil, the first magnet, the second magnet, and the first upper magnetic conductor of the speaker shown in FIG2 ;

[0054] FIG24 is a simplified schematic diagram of the magnetic field distribution of the voice coil, the first magnet, the second magnet, the first upper magnetic conductor, and the lower magnetic conductor of the speaker shown in FIG2 ;

[0055] FIG25 is a simplified schematic diagram of the magnetic field distribution of the voice coil and magnetic circuit assembly of the loudspeaker shown in FIG2 ;

[0056] FIG26 is a partially simplified structural diagram of the vibration assembly and magnetic circuit assembly of the loudspeaker shown in FIG21 in another embodiment;

[0057] FIG27 is a schematic diagram of a cross-sectional structure of the speaker and internal components of the electronic device shown in FIG20 in some embodiments;

[0058] FIG28 is a schematic diagram comparing resonance curves of the loudspeaker shown in FIG27 and a conventional loudspeaker. DETAILED DESCRIPTION

[0059] The embodiments of the present application are described below in conjunction with the accompanying drawings in the embodiments of the present application.

[0060] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. Among them, "fixed connection" means that the two are connected to each other and the relative position relationship after connection remains unchanged. The directional terms mentioned in the embodiments of the present application, such as "up", "down", "left", "right", "inside", "outside", etc., are only reference to the directions of the accompanying drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the embodiments of the present application, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application. "Multiple" means at least two.

[0061] In the embodiments of this application, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first," "second," "third," or "fourth" may explicitly or implicitly include one or more of the features.

[0062] In the embodiments of this application, "and / or" is simply a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the related objects are in an "or" relationship.

[0063] References to "one embodiment" or "some embodiments" in this specification mean that a particular feature, structure, or characteristic described in conjunction with the embodiment is included in one or more embodiments of the present application. Thus, phrases such as "in one embodiment," "in some embodiments," "in some other embodiments," and "in another embodiment" appearing in various places in this specification do not necessarily refer to the same embodiment, but rather mean "one or more but not all embodiments," unless otherwise specifically emphasized. The terms "including," "comprising," "having," and variations thereof all mean "including but not limited to," unless otherwise specifically emphasized.

[0064] It is understood that the specific embodiments described herein are only used to explain the relevant embodiments, rather than to limit the embodiments. It should also be noted that, for ease of description, only parts related to the embodiments are shown in the drawings.

[0065] Figure 1a is a schematic diagram of the structure of an embodiment of an electronic device 1000 provided in an embodiment of the present application. Figure 1b is a schematic diagram of the cross-sectional structure of an embodiment of the electronic device 1000 shown in Figure 1a taken along line AA. Figure 2 is a schematic diagram of the structure of a speaker 100 of the electronic device 1000 shown in Figure 1b in an embodiment.

[0066] As shown in Figures 1a to 2, the electronic device 1000 can be an electronic device 1000 such as a wearable device such as a headset that realizes audio input by approaching the human ear canal or through the ear. Among them, the wearable device can also be smart glasses or a smart head display. When the electronic device 1000 is a headset, the headset can be a wired headset or a true wireless stereo (True Wireless Stereo, TWS) headset. Among them, TWS headsets can be wirelessly connected to external devices such as mobile phones, computers, laptops, car-mounted equipment or wearable devices. The following will be explained as an example of the electronic device 1000 being a TWS headset. It should be noted that in order to clearly illustrate the structure of the electronic device 1000, the electronic device 1000 in Figures 1a and 1b only illustrates one headset. Of course, the electronic device 1000 can also be a pair of headphones.

[0067] Exemplarily, the electronic device 1000 may include a speaker 100 and a device housing 200. The speaker 100 may be disposed inside the device housing 200. The number of speakers 100 may be one or more. The device housing 200 may be provided with a sound outlet 201. The sound outlet 201 may connect the inside of the electronic device 1000 to the outside. When the electronic device 1000 is worn on the ear, the sound outlet 201 may face the external auditory canal of the ear or extend into the external auditory canal of the ear. At this time, the sound waves emitted by the electronic device 1000 may be transmitted into the external auditory canal of the ear through the sound outlet 201.

[0068] FIG3 is a schematic diagram of the exploded structure of the speaker 100 shown in FIG2 in some embodiments.

[0069] As shown in Figures 2 and 3, the speaker 100 may include a housing 10, a vibration assembly 20, a magnetic circuit assembly 30, a circuit board 40, and a support member 50. The vibration assembly 20 may include a diaphragm 21 and a voice coil 22. The magnetic circuit assembly 30 may include a first magnet 31, a second magnet 32, a first upper magnetic conductor 33, a second upper magnetic conductor 34, and a lower magnetic conductor 35.

[0070] Exemplarily, the circuit board 40 can be a hard circuit board, a soft circuit board, or a hard-soft combined circuit board. The material of the first magnet 31 and the second magnet 32 ​​can be a hard magnetic material, also known as a permanent magnetic material (permanent magnet) or a permanent magnetic material (permanent magnet). It is understood that a hard magnetic material is a permanent magnetic material that can retain magnetism for a long time. For example, a magnet, etc. The material of the first upper magnetic conductor 33, the second upper magnetic conductor 34, and the lower magnetic conductor 35 can be a magnetic conductive material. The magnetic permeability of the magnetic conductive material is greater than the magnetic permeability of air.

[0071] In some embodiments, the speaker 100 may not include the circuit board 40 and the support member 50. The magnetic circuit assembly 30 may not include the second upper magnetic conductor 34 and the lower magnetic conductor 35.

[0072] Figure 4 is a schematic diagram of the assembly structure of the first magnet 31, the second magnet 32 ​​and the lower magnetic conductor 35 shown in Figure 3. Figure 5 is a schematic diagram of a partial cross-section of the loudspeaker 100 shown in Figure 2 taken along line BB in one embodiment.

[0073] As shown in Figures 4 and 5, the first magnet 31 can be roughly disc-shaped. The second magnet 32 ​​can be roughly ring-shaped. The inner peripheral side wall of the second magnet 32 ​​can surround the first through hole 321. The shape of the first through hole 321 can be adapted to the shape of the first magnet 31. The first magnet 31 can be located in the first through hole 321 of the second magnet 32. The first magnet 31 and the second magnet 32 ​​can be coaxially arranged, that is, the central axis of the first magnet 31 can coincide with the central axis of the second magnet 32. In this way, the magnetic field distribution formed by the first magnet 31 and the second magnet 32 ​​is relatively symmetrical.

[0074] It should be noted that the coaxial arrangement of the first magnet 31 and the second magnet 32 ​​can be such that their central axes completely coincide with each other, or the distance between the central axis of the first magnet 31 and the central axis of the second magnet 32 ​​can be within a certain error range, for example, the distance between the central axis of the first magnet 31 and the central axis of the second magnet 32 ​​is less than 0.1 mm. Alternatively, the central axis of the first magnet 31 can also form an angle within a certain range with the central axis of the second magnet 32, for example, the angle formed between the central axis of the first magnet 31 and the central axis of the second magnet 32 ​​can be less than 1°. It is understandable that the coaxial arrangement of the first magnet 31 and the second magnet 32 ​​makes the magnetic field formed by the first magnet 31 and the second magnet 32 ​​more symmetrical, which is beneficial to improving the acoustic performance of the speaker 100.

[0075] Exemplarily, the thickness of the first magnet 31 may be equal to the thickness of the second magnet 32. In this way, the magnetic field distribution formed by the first magnet 31 and the second magnet 32 ​​is relatively symmetrical, which is beneficial to improving the acoustic performance of the speaker 100. For ease of understanding, the thickness direction of the speaker 100 is defined as the first direction. The dimensions of each component of the speaker 100 in the first direction are the thickness of the component in the first direction, which may be referred to as the thickness of the component hereinafter. In other embodiments, the thickness of the first magnet 31 may not be equal to the thickness of the second magnet 32. For example, the thickness of the first magnet 31 may also be less than the thickness of the second magnet 32.

[0076] Exemplarily, the outer peripheral side wall of the first magnet 31 can be spaced apart from the inner peripheral side wall of the second magnet 32, that is, a magnetic gap 30a can be formed between the outer peripheral side wall of the first magnet 31 and the inner peripheral side wall of the second magnet 32. When the central axis of the first magnet 31 coincides with the central axis of the second magnet 32, the width of the magnetic gap 30a at any position is equal, that is, the magnetic gap 30a can be of equal width. The width of the magnetic gap 30a can refer to the distance between the outer peripheral side wall of the first magnet 31 and the inner peripheral side wall of the second magnet 32. In some embodiments, the outer peripheral side wall of the first magnet 31 can also contact the inner peripheral side wall of the second magnet 32. That is, no magnetic gap 30a can be formed between the outer peripheral side wall of the first magnet 31 and the inner peripheral side wall of the second magnet 32.

[0077] For example, the first magnet 31 and the second magnet 32 ​​can both be located on the same side of the lower magnet 35 and fixedly connected to the lower magnet 35. The lower magnet 35 can be roughly disc-shaped. The central axis of the lower magnet 35 can also coincide with the central axis of the first magnet 31. It should be understood that the coincidence of the central axis of the lower magnet 35 with the central axis of the first magnet 31, as well as the subsequent coincidence of the two central axes, can also refer to the definition of the central axis of the first magnet 31 coinciding with the central axis of the second magnet 32. It can be understood that by arranging the lower magnet 35 on the same side of the first magnet 31 and the second magnet 32, the overall magnetic field strength of the magnetic circuit assembly 30 can be enhanced, thereby effectively improving the efficiency of the speaker 100. Under conditions of equal magnetic field strength, the speaker 100 in this embodiment enhances the magnetic field strength by arranging the lower magnet 35, thereby reducing the size of the first magnet 31 and / or the second magnet 32, thereby facilitating a miniaturized design of the entire speaker 100.

[0078] Figure 6 is a schematic diagram of the structure of the circuit board 40 of the loudspeaker 100 shown in Figure 3. Figure 7 is a schematic diagram of the assembled structure of a portion of the loudspeaker 100 shown in Figure 3 in one embodiment. Figure 8 is a schematic diagram of a partial cross-section of the loudspeaker 100 shown in Figure 2 taken along line BB in one embodiment.

[0079] As shown in Figures 6 to 8, the circuit board 40 may include a main body 41 and an extension portion 42. The main body 41 may be roughly annular. The inner peripheral side wall of the main body 41 may surround a second through hole 411. The extension portion 42 may be fixedly connected to the outer peripheral side wall of the main body 41. It should be understood that although the circuit board 40 is divided into two parts for introduction in this embodiment, it does not affect the fact that the circuit board 40 can be an integrally formed structure, that is, the main body 41 and the extension portion 42 can be integrally formed. Among them, Figures 6 to 8 schematically divide the fixed portion and the extension portion 42 of the circuit board 40 by dotted lines.

[0080] For example, the main body 41 of the circuit board 40 can be fixedly connected to the surface of the second magnet 32 ​​facing away from the lower magnetic conductor 35. In this case, at least a portion of the extension portion 42 of the circuit board 40 can be exposed relative to the outer peripheral side wall of the second magnet 32. The extension portion 42 of the circuit board 40 can be used to electrically connect external devices (such as a power supply) of the speaker 100. The second through hole 411 of the main body 41 of the circuit board 40 can be connected to the first through hole 321 of the second magnet 32. The second through hole 411 can expose the first magnet 31, a portion of the second magnet 32, and the magnetic gap 30a between the first magnet 31 and the second magnet 32.

[0081] Fig. 9 is a schematic structural diagram of the second upper magnetic conductor 34 of the loudspeaker 100 shown in Fig. 3. Fig. 10 is a schematic structural diagram of the second upper magnetic conductor 34 shown in Fig. 9 from another perspective.

[0082] As shown in Figures 9 and 10, the second upper magnetic conductor 34 can be partially broken to form a notch 34a. In this case, the second upper magnetic conductor 34 can be approximately annular. The inner sidewall of the second upper magnetic conductor 34 can approximately enclose the third through hole 34b. The second upper magnetic conductor 34 can include an upper surface 341 and a lower surface 342 disposed in opposite directions.

[0083] For example, the second upper magnetic conductor 34 may be provided with a first avoidance step 342a. The opening of the first avoidance step 342a may be formed on the lower surface 342 and the outer peripheral side of the second upper magnetic conductor 34. The first avoidance step 342a may be connected to the third through hole 34b through the notch 34a.

[0084] For example, the upper surface 341 may include a first region 3411, a second region 3412, and a transition region 3413. The transition region 3413 may connect the first region 3411 and the second region 3412. The first region 3411 may be located on the side of the transition region 3413 close to the outer peripheral sidewall of the second upper magnetic conductor 34. The second region 3412 may be located on the side of the transition region 3413 close to the inner peripheral sidewall of the second upper magnetic conductor 34. In the first direction, the distance from the first region 3411 to the lower surface 342 may be greater than the distance from the second region 3412 to the lower surface 342. In other words, the first region 3411 may be higher than the second region 3412, and the first region 3411 and the second region 3412 may have a thickness difference in the first direction. In this case, a second relief step 341a may be formed between the transition region 3413 and the second region 3412. The second relief step 341a may connect the third through-hole 34b and the notch 34a.

[0085] Figure 11 is a schematic diagram of the assembled structure of a portion of the loudspeaker 100 shown in Figure 3 in one embodiment. Figure 12 is a schematic diagram of the cross-sectional structure of the loudspeaker 100 shown in Figure 2 taken along line BB in one embodiment. Figure 13 is a schematic diagram of the cross-sectional structure of a portion of the loudspeaker 100 shown in Figure 2 taken along line CC in one embodiment.

[0086] As shown in Figures 11 to 13, the first upper magnet 33 can be roughly disc-shaped. The first upper magnet 33 can be fixedly connected to the surface of the first magnet 31 facing away from the lower magnet 35. The width of the first upper magnet 33 (that is, the diameter of the first upper magnet 33 in this embodiment) is the first width H1. The first width H1 can be smaller than the width of the first magnet 31 (that is, the diameter of the first magnet 31 in this embodiment). At this time, the projection of the first upper magnet 33 in the first direction may not overlap with the second magnet 32. The projection of the first upper magnet 33 in the first direction may overlap with the first magnet 31. The width of the first upper magnet 33 may be greater than or equal to 0.5 mm. In this way, the first upper magnet 33 has a certain width, so that the first upper magnet 33 can be fixed to the surface of the first magnet 31 by bonding or the like.

[0087] For example, the lower surface 342 of the second upper magnetic conductor 34 can be fixedly connected to the surface of the second magnet 32 ​​away from the lower magnetic conductor 35. The aperture of the third through hole 34b of the second upper magnetic conductor 34 can be larger than the width of the first upper magnetic conductor 33. In this case, the first upper magnetic conductor 33 can be located in the third through hole 34b of the second upper magnetic conductor 34.

[0088] For example, the diameter of the third through hole 34b of the second upper magnetic conductor 34 may be larger than the width of the first magnet 31. In this case, the third through hole 34b of the second upper magnetic conductor 34 may expose a portion of the surface of the first magnet 31, a portion of the surface of the second magnet 32, the magnetic gap 30a between the first magnet 31 and the second magnet 32, and the first upper magnetic conductor 33.

[0089] Exemplarily, the main body 41 of the circuit board 40 can be located within the first avoidance step 342a of the second upper magnetic conductor 34. Part of the main body 41 of the circuit board 40 can be exposed relative to the notch 34a of the second upper magnetic conductor 34. Exemplarily, the extension portion 42 of the circuit board 40 can be fixedly connected to the portion of the main body 41 exposed from the notch 34a of the second upper magnetic conductor 34. In other embodiments, the extension portion 42 of the circuit board 40 can also be fixedly connected to other positions of the outer peripheral side wall of the main body 41. In some other embodiments, the main body 41 of the circuit board 40 may not be fixed to the second magnet 32, and the main body 41 of the circuit board 40 may also be fixed to the first avoidance step 342a of the second upper magnetic conductor 34.

[0090] Figure 14 is an exploded schematic diagram of the vibration assembly 20 of the loudspeaker 100 shown in Figure 3. Figure 15 is a partial cross-sectional schematic diagram of the loudspeaker 100 shown in Figure 2 taken along line BB in one embodiment. Figure 16a is a schematic diagram of the assembly structure of the diaphragm 21 and voice coil 22 shown in Figure 14 from another perspective. Figure 16b is a top view of the voice coil 22 shown in Figure 14 in one embodiment.

[0091] As shown in Figures 14 to 16b, the diaphragm 21 can be roughly disc-shaped. The diaphragm 21 can include a first vibrating portion 21a and a second vibrating portion 21b. The second vibrating portion 21b can be roughly annular. The first vibrating portion 21a can be located inside the second vibrating portion 21b and fixedly connected to the second vibrating portion 21b.

[0092] Exemplarily, the first vibration part 21a may include a first straight portion 211 and a first folded ring portion 212. The first straight portion 211 may be roughly annular. The first folded ring portion 212 may be located on the inner side of the first straight portion 211 and fixedly connected to the first straight portion 211. The second vibration part 21b may include a second straight portion 213 and a second folded ring portion 214. The second folded ring portion 214 may be fixedly connected between the first straight portion 211 and the second straight portion 213. It should be understood that although the diaphragm 21 is divided into four parts for introduction in this embodiment, it does not affect the fact that the diaphragm 21 can be an integrally molded structure, that is, the first folded ring portion 212, the first straight portion 211, the second folded ring portion 214 and the second straight portion 213 can be integrally molded.

[0093] Exemplarily, the first folding ring portion 212 may be roughly spherical. The second folding ring portion 214 may be roughly arc-shaped. The first folding ring portion 212 and the second folding ring portion 214 may be arched in the same direction. In this way, the diaphragm 21 has a bent portion (i.e., the first folding ring portion 212 and the second folding ring portion 214 in this embodiment), which is conducive to improving the displacement of the diaphragm 21 in its vibration direction. In other embodiments, the diaphragm 21 may not include the first folding ring portion 212 or the second folding ring portion 214. At this time, the diaphragm 21 has one folding ring portion. In some other embodiments, the diaphragm 21 may not include the first folding ring portion 212 and the second folding ring portion 214. At this time, the diaphragm 21 may be a planar diaphragm. The present application does not limit the specific shape of the diaphragm 21.

[0094] Exemplarily, the voice coil 22 can be fixedly connected to the first straight portion 211 of the diaphragm 21. In this case, the inner peripheral side wall of the voice coil 22 can enclose the first accommodation space 20a of the vibration assembly 20 together with the diaphragm 21, that is, the first accommodation space 20a can be located on the inner side of the voice coil 22. The inner width of the voice coil 22 is the second width H2. The second width H2 can be greater than or equal to 0.6 mm, that is, the width of the first accommodation space 20a can be greater than or equal to 0.6 mm. In this embodiment, the voice coil 22 is a circular ring. In this case, the inner width of the voice coil 22 can be the diameter of the voice coil hole. In other embodiments, the voice coil 22 can also be roughly in the shape of a long strip, with two straight sides parallel to each other. In this case, the inner width of the voice coil 22 is the distance between the two straight sides of the voice coil 22.

[0095] Exemplarily, the voice coil 22 can be formed by a wire being wound multiple times along a plane perpendicular to the first direction. In this case, the plane is the winding plane of the voice coil 22. The winding plane of the voice coil 22 can be perpendicular to the first direction. For ease of understanding, Figure 16b roughly illustrates the winding method of the voice coil 22 through a top view of the voice coil 22. The two ends of the wire can respectively constitute the first end 221 and the second end 222 of the voice coil 22. The distance between the inner circumferential side wall and the outer circumferential side wall of the voice coil 22 is the third width H3. The third width H3 can be greater than the thickness of the voice coil 22. In this case, the voice coil 22 can be a planar voice coil. In some embodiments, the voice coil 22 can also be formed by multiple wires being wound multiple times along a plane perpendicular to the first direction. Among them, the multiple wires can be arranged along the first direction.

[0096] Figure 17 is a schematic diagram of a partial cross-section of the loudspeaker 100 shown in Figure 2 taken along line BB in one embodiment. Figure 18 is a schematic diagram of the assembly structure of the vibration assembly 20 and magnetic circuit assembly 30 of the loudspeaker 100 shown in Figure 3 in one embodiment. For ease of understanding, the diaphragm 21 of the vibration assembly 20 is omitted in Figure 18.

[0097] As shown in Figures 17 and 18, the second straight portion 213 of the diaphragm 21 can be fixedly connected to the first area 3411 of the upper surface 341 of the second upper magnetic conductor 34. The voice coil 22 can be located on the side of the diaphragm 21 closest to the magnetic circuit assembly 30. The projection of the voice coil 22 in the first direction can overlap with a portion of the first magnet 31 and / or a portion of the second magnet 32. In this embodiment, the projection of the voice coil 22 in the first direction can overlap with a portion of the first magnet 31 and a portion of the second magnet 32. In this case, the projection of the voice coil 22 in the first direction can overlap with the magnetic gap 30a of the magnetic circuit assembly 30. For example, the voice coil 22 can be spaced apart from the first magnet 31 and the second magnet 32 ​​in the first direction, thereby reserving space for the voice coil 22 to vibrate in the first direction. The second relief step 341a of the second upper magnetic conductor 34 can also be used to clear the diaphragm 21, thereby reserving space for the diaphragm 21 to vibrate in the first direction.

[0098] For example, a portion of the first upper magnetic conductor 33 can be located within the first accommodation space 20a of the vibration assembly 20, that is, a portion of the first upper magnetic conductor 33 can be located inside the voice coil 22. A portion of the voice coil 22 can be located within the third through-hole 34b of the second upper magnetic conductor 34, that is, the second upper magnetic conductor 34 can be located on the side of the voice coil 22 facing away from the first upper magnetic conductor 33. In this case, a portion of the voice coil 22 can be located between the first upper magnetic conductor 33 and the second upper magnetic conductor 34. The distance between the second upper magnetic conductor 34 and the voice coil 22 can be greater than or equal to 0.05 mm. This creates a gap between the second upper magnetic conductor 34 and the outer peripheral sidewall of the voice coil 22, thereby preventing the voice coil 22 from colliding with the second upper magnetic conductor 34 during vibration due to displacement along the width of the voice coil 22 (in this embodiment, the radial direction of the voice coil 22), which could affect the acoustic performance of the speaker 100.

[0099] For example, the width of the first upper magnetic conductor 33 can be smaller than the inner width of the voice coil 22. In some embodiments, the difference between the width of the first upper magnetic conductor 33 and the inner width of the voice coil 22 can be greater than or equal to 0.1 mm. This creates a gap between the first upper magnetic conductor 33 and the inner circumferential sidewall of the voice coil 22, thereby preventing the voice coil 22 from colliding with the first upper magnetic conductor 33 during vibration (in this embodiment, the radial direction of the voice coil 22), potentially affecting the acoustic performance of the speaker 100. In some embodiments, the difference between the width of the first upper magnetic conductor 33 and the inner width of the voice coil 22 can be within a range of 0.1 mm to 0.2 mm. This allows the speaker 100 to avoid collisions between the voice coil 22 and the first upper magnetic conductor 33 while maintaining a smaller overall size, facilitating a compact design.

[0100] For example, the first end 221 of the voice coil 22 can extend to the notch 34a of the second upper magnetic conductor 34 and be electrically connected to the circuit board 40. The second end 222 of the voice coil 22 can also extend to the notch 34a of the second upper magnetic conductor 34 and be electrically connected to the circuit board 40. In this way, the voice coil 22, the circuit board 40, and the external components of the speaker 100 can form a current loop. For example, the external components of the speaker 100 can transmit current signals to the voice coil 22 through the circuit board 40.

[0101] In some embodiments, solder joint protection adhesive 43 may be provided on the circuit board 40. The solder joint protection adhesive 43 may be located in the notch 34a of the second upper magnetic conductor 34 and fixedly connected to the main body 41 of the circuit board 40 (Figures 6 to 8 also illustrate the solder joint protection adhesive 43). The solder joint protection adhesive 43 may cover both the connection between the first end 221 of the voice coil 22 and the circuit board 40, as well as the connection between the second end 222 of the voice coil 22 and the circuit board 40. FIG18 illustrates the first end 221 and the second end 222 of the voice coil 22 using dashed lines. In this way, the solder joint protection adhesive 43 can prevent impurities such as dust and foreign matter from affecting the reliability of the electrical connection between the voice coil 22 and the circuit board 40. In other embodiments, the speaker 100 may not include the circuit board 40. Instead, the vibration assembly 20 may lead the first end 221 and the second end 222 of the voice coil 22 out of the notch 34a of the second upper magnetic conductor 34 and directly electrically connect to external components of the speaker 100.

[0102] Figure 19 is a schematic diagram of the assembled structure of a portion of the loudspeaker 100 shown in Figure 3 in one embodiment. Figure 20 is a schematic diagram of a partial cross-sectional structure of the loudspeaker 100 shown in Figure 2 taken along line BB in one embodiment. Figure 21 is a schematic diagram of a partial cross-sectional structure of the loudspeaker 100 shown in Figure 2 taken along line CC in one embodiment.

[0103] As shown in Figures 19 to 21 , the support member 50 can be generally annular. For example, the support member 50 can be a steel ring. The support member 50 can be located on the side of the diaphragm 21 away from the voice coil 22 and fixedly connected to the second straight portion 213 of the diaphragm 21. The housing 10 can include a top portion 11 and a frame portion 12. The frame portion 12 can be fixedly connected to the periphery of the top portion 11. In some embodiments, the support member 50 can also be integrally formed with the housing 10.

[0104] For example, the top 11 of the housing 10 may include a first surface 111 and a second surface 112 disposed opposite each other. The first surface 111 may be the surface of the top 11 facing away from the frame 12. The second surface 112 may be the surface of the top 11 facing toward the frame 12. The second surface 112 of the top 11 may be the surface of the support member 50 that is fixedly connected and faces away from the diaphragm 21. In this case, the housing 10 and the lower magnetic conductor 35 may enclose the interior space of the speaker 100. The diaphragm 21 may divide the interior space of the speaker 100 into a front cavity 100a and a rear cavity 100b that are not interconnected. The front cavity 100a is located on the side of the diaphragm 21 away from the voice coil 22. The rear cavity 100b is located on the side of the diaphragm 21 closer to the voice coil 22. The space between the outer peripheral sidewall of the voice coil 22 and the frame 12 of the housing 10 may constitute the second accommodation space 20b of the vibration assembly 20. A portion of the second upper magnetic conductor 34 may be located within the second accommodation space 20b.

[0105] For example, the frame portion 12 of the housing 10 may be provided with a relief hole 12a. The extension portion 42 of the circuit board 40 may extend through the relief hole 12a of the housing 10 to the exterior of the speaker 100 and electrically connect to external components of the speaker 100. The top 11 of the housing 10 may be provided with a sound outlet 11a. The sound outlet 11a may connect the front cavity 100a of the speaker 100 with the exterior of the speaker 100.

[0106] For example, the polarity of the portion of the first magnet 31 near the voice coil 22 is opposite to the polarity of the portion of the second magnet 32 ​​near the voice coil 22. The polarity of the portion of the first magnet 31 away from the voice coil 22 is also opposite to the polarity of the portion of the second magnet 32 ​​away from the voice coil 22. In other words, the polarity direction of the first magnet 31 can be opposite to the polarity direction of the second magnet 32. The polarity direction refers to the direction from the north pole to the south pole of the magnet.

[0107] For example, the polarity of the portion of the first magnet 31 near the voice coil 22 can be an S pole, while the polarity of the portion of the first magnet 31 far from the voice coil 22 can be an N pole. The polarity of the portion of the second magnet 32 ​​near the voice coil 22 can be an N pole, while the polarity of the portion of the second magnet 32 ​​far from the voice coil 22 can be an S pole. In this case, the magnetic field lines generated by portions of the first magnet 31 and the second magnet 32 ​​can pass through the voice coil 22 in a substantially horizontal direction. When power is supplied to the voice coil 22, the voice coil 22 can generate a Lorentz force in a first direction. The voice coil 22 can move in response to the Lorentz force, cutting through the magnetic flux lines and driving the diaphragm 21 to vibrate in the first direction. It should be understood that FIG. 20 illustrates only one embodiment of the magnetization method for the first magnet 31 and the second magnet 32. Other magnetization methods can also be used for the first magnet 31 and the second magnet 32, and this application does not specifically limit this.

[0108] In some embodiments, sealant may be filled between the frame portion 12 of the housing 10 and the lower magnet 35 to seal the rear cavity 100b of the speaker 100. In other embodiments, the speaker 100 may further include a back cover. The back cover may be located on the side of the frame 12 away from the top 11 and fixedly connected to the periphery of the frame 12. In this case, the housing 10 and the back cover may enclose the internal space of the speaker 100. In other embodiments, when the speaker 100 is used in an electronic device 1000, the surface of the lower magnet 35 of the speaker 100 facing away from the first magnet 31 may be fixed to other components inside the electronic device 1000. In this case, the surface of the other components to which the lower magnet 35 is fixedly connected may enclose the internal space of the speaker 100 with the housing 10. That is, the speaker 100 may use other components inside the electronic device 1000 to seal its internal space.

[0109] Figure 22 is a simplified schematic diagram of the magnetic field distribution of the voice coil, first magnet, and second magnet of a planar diaphragm speaker in some embodiments. Figure 23 is a simplified schematic diagram of the magnetic field distribution of the voice coil 22, first magnet 31, second magnet 32, and first upper magnetic conductor 33 of the speaker 100 shown in Figure 2. Figure 24 is a simplified schematic diagram of the magnetic field distribution of the voice coil 22, first magnet 31, second magnet 32, first upper magnetic conductor 33, and lower magnetic conductor 35 of the speaker 100 shown in Figure 2. Figure 25 is a simplified schematic diagram of the magnetic field distribution of the voice coil 22 and magnetic circuit assembly 30 of the speaker 100 shown in Figure 2.

[0110] Referring to Figures 22 to 25 , it can be understood that the magnetic circuit components in typical planar diaphragm speakers can only conduct magnetism through air to allow magnetic flux lines to pass through the voice coil. Due to the low magnetic permeability of air, magnetic flux lines have difficulty passing through air, resulting in a low magnetic flux density at the voice coil location (as shown in Figure 22 ), low efficiency of the planar diaphragm speaker, and poor treble performance. In contrast, the speaker 100 in this embodiment provides a first upper magnetic conductor 33 with a magnetic conductivity function inside the voice coil 22. The first upper magnetic conductor 33 can converge the magnetic flux lines in the magnetic field generated between the first magnet 31 and the second magnet 32 ​​to the voice coil 22 location (as shown in Figure 23 ), thereby effectively increasing the force factor of the magnetic field, enhancing the magnetic flux density at the voice coil 22 location, improving the efficiency of the speaker 100, and enhancing the treble performance of the speaker 100. Furthermore, compared to conventional planar diaphragm speakers that require increasing the size of the magnet to enhance the magnetic flux density at the voice coil, the speaker 100 of this embodiment significantly enhances the magnetic flux density at the voice coil 22 simply by disposing the first upper magnetic conductor 33 inside the voice coil 22. Furthermore, the first upper magnetic conductor 33 utilizes the space between the diaphragm 21 and the first magnet 31, allowing the first upper magnetic conductor 33 to enhance the magnetic flux density at the voice coil 22 without increasing the overall width and thickness of the speaker 100. In other words, while maintaining the same magnetic flux density at the voice coil 22, the speaker 100 of this embodiment can be made smaller, facilitating a more compact design.

[0111] Secondly, in this embodiment, the first upper magnetic conductor 33 is fixedly connected to the first magnet 31, allowing direct contact between the first upper magnetic conductor 33 and the first magnet 31, with no gap between them. Thus, after the magnetic flux lines pass through the first magnet 31, they can be conducted directly through the first upper magnetic conductor 33 without passing through air. The high magnetic permeability of the first upper magnetic conductor 33 makes it easier for the magnetic flux lines to pass through the first upper magnetic conductor 33, allowing more of them to converge at the voice coil 22. This increases the force factor of the magnetic field, improves the magnetic induction intensity at the voice coil 22, and improves the efficiency of the speaker 100.

[0112] In addition, the speaker 100 in this embodiment further includes a second upper magnetic conductor 34, which is located outside the voice coil 22. This allows the second upper magnetic conductor 34 to further converge the magnetic flux lines generated in the magnetic field between the first magnet 31 and the second magnet 32 ​​toward the voice coil 22, thereby further increasing the force factor of the magnetic field and enhancing the magnetic induction intensity at the voice coil 22. This improves the efficiency of the speaker 100, the output sound quality of the speaker 100, and the high-frequency effect of the speaker 100. Furthermore, the presence of magnetic conductors on both the inside and outside of the voice coil 22 (in this embodiment, the first upper magnetic conductor 33 and the second upper magnetic conductor 34) results in a more symmetrical magnetic field distribution inside and outside the voice coil 22 (as shown in FIG. 24 ), which facilitates improved acoustic performance of the speaker 100.

[0113] Furthermore, in this embodiment, the second upper magnetic conductor 34 is fixedly connected to the second magnet 32, allowing direct contact between the second upper magnetic conductor 34 and the second magnet 32, with no gap between them. Thus, after the magnetic flux lines pass through the second magnet 32, they can be conducted directly through the second upper magnetic conductor 34 without passing through air. The higher magnetic permeability of the second upper magnetic conductor 34 makes it easier for the magnetic flux lines to pass through the second upper magnetic conductor 34, allowing more of them to converge at the voice coil 22. This increases the force factor of the magnetic field, improves the magnetic induction intensity at the voice coil 22, and improves the efficiency of the speaker 100.

[0114] In addition, the speaker 100 in this embodiment further includes a lower magnetic conductor 35. The lower magnetic conductor 35 is fixed to the side of the first magnet 31 facing away from the voice coil 22. This further enhances the overall magnetic field strength of the magnetic circuit assembly 30, increases the magnetic field force factor, and thus improves the efficiency of the speaker 100 (as shown in FIG25 ). Furthermore, under conditions of equal magnetic field strength, the speaker 100 in this embodiment enhances the magnetic field strength by providing the lower magnetic conductor 35, thereby enabling the first magnet 31 and / or the second magnet 32 ​​to be made smaller, facilitating a compact design for the entire speaker 100. Alternatively, while maintaining the overall thickness of the speaker 100, the lower magnetic conductor 35 can be provided by sacrificing a portion of the thickness of the first magnet 31 and the second magnet 32. This increases the magnetic field force factor while maintaining the thickness of the speaker 100, thereby improving the magnetic induction intensity at the voice coil 22 and thereby improving the efficiency of the speaker 100. In some embodiments, the provision of the magnetic circuit assembly 30 in this embodiment can increase the magnetic field force factor of the speaker 100 by approximately 30% compared to the speaker shown in FIG22 .

[0115] In other embodiments, the voice coil 22 may be in an elongated shape with two parallel straight sides. The width direction of the voice coil 22 is the arrangement direction of the two straight sides of the voice coil 22. The second magnet 32 ​​may further include a first sub-magnet and a second sub-magnet. The first magnet 31, the first sub-magnet, and the second sub-magnet may all be in an elongated shape. The first sub-magnet, the first magnet 31, and the second sub-magnet may be arranged sequentially along the width direction of the first magnet 31. The first magnet 31 may be located between the first sub-magnet and the second sub-magnet, that is, the first magnet 31 may be located inside the second magnet 32. The width direction of the first magnet 31 may be parallel to the width direction of the voice coil 22. The polarization directions of the first magnet 31, the first sub-magnet, and the second sub-magnet may all be parallel to the first direction. The polarization direction of the first sub-magnet may be the same as the polarization direction of the second sub-magnet. The polarization direction of the first magnet 31 may be different from the polarization direction of the second magnet 32. At this time, the shapes of other components of the loudspeaker 100 (such as the voice coil 22 and the first upper magnetic conductor 33 ) may also be correspondingly long strips.

[0116] In some other embodiments, the magnetic circuit assembly 30 may further include a fourth magnet and a fifth magnet. The multiple magnets in the magnetic circuit assembly 30 may be arranged in a Haier shell array to enhance the magnetic induction intensity at the voice coil 22. This application does not specifically limit the shape, number, or arrangement of the magnets in the magnetic circuit assembly 30.

[0117] FIG26 is a partially simplified structural diagram of the vibration component 20 and the magnetic circuit component 30 of the loudspeaker 100 shown in FIG21 in another embodiment.

[0118] As shown in Figure 26, the structures of the vibration assembly 20 and magnetic circuit assembly 30 of the loudspeaker 100 in this embodiment are substantially the same as those shown in Figure 21, and the similarities are not further described. The differences between the two will be described below. The first vibrating portion 21a of the diaphragm 21 in this embodiment may include a first connecting portion 215, a first main portion 216, a second connecting portion 217, and a second main portion 218. The first connecting portion 215, the first main portion 216, and the second connecting portion 217 may all be annular. The second main portion 218 may be located inside the first connecting portion 215 and fixedly connected to the first connecting portion 215. The second connecting portion 217 may be located on the side of the first connecting portion 215 facing away from the second main portion 218. The first main portion 216 may be connected between the first connecting portion 215 and the second connecting portion 217. The second connecting portion 217 may be connected between the second vibrating portion 21b and the first main portion 216. The voice coil 22 may be a conductor and embedded in the first main portion 216. The surface of the voice coil 22 facing the first magnet 31 can be exposed relative to the first main body 216. The voice coil 22 can be formed by a single conductor wound multiple times along a plane perpendicular to the first direction. That is, the winding plane of the voice coil 22 can be perpendicular to the first direction. The distance between the inner and outer sidewalls of the voice coil 22 can be greater than the thickness of the voice coil 22. In this case, the voice coil 22 can be a planar voice coil. It should be understood that the first connecting portion 215, the first main body 216, the second connecting portion 217, and the second main body 218 of the first vibrating portion 21a are schematically demarcated by dashed lines in Figure 26.

[0119] For example, in the first direction, the distance from the first main body portion 216 to the first magnet 31 can be smaller than the distance from the second main body portion 218 to the first magnet 31. In this case, in the first direction, there can be a thickness difference between the first main body portion 216 and the second main body portion 218. The first connecting portion 215 and the second main body portion 218 can enclose a first accommodating space 20a of the vibration assembly 20. The first accommodating space 20a can be used to accommodate part of the first upper magnetic conductor 33. Part of the first upper magnetic conductor 33 can be located on the inner side of the first connecting portion 215, that is, part of the first upper magnetic conductor 33 can be located on the inner side of the voice coil 22. The inner width of the first connecting portion 215 is the fourth width. The fourth width can be greater than or equal to 0.6 mm. It should be understood that the definition of the inner width of the first connecting portion 215 can refer to the definition of the inner width of the voice coil 22. No further details are given here.

[0120] For example, the second connecting portion 217 of the first vibrating portion 21a, the second vibrating portion 21b, and the housing 10 (see FIG. 21 ) can enclose a second accommodating space 20b that can accommodate a portion of the second upper magnetic conductor 34 .

[0121] It can be understood that the speaker 100 in this embodiment embeds the voice coil 22 in the first main body part 216 of the diaphragm 21 and sinks the first main body part 216 in the direction close to the first magnet 31, so that the vibration component 20 can realize that the voice coil 22 is embedded in the diaphragm 21. At the same time, the inner side of the voice coil 22 of the vibration component 20 can still have a first accommodating space 20a for storing the first upper magnetic conductor 33, so that the first upper magnetic conductor 33 can be set on the inner side of the voice coil 22 to enhance the magnetic induction intensity at the position of the voice coil 22 and improve the efficiency of the speaker 100.

[0122] Figure 27 is a schematic diagram of the cross-sectional structure of the speaker 100 shown in Figure 20 and the internal components 300 of the electronic device 1000 in some embodiments. Figure 28 is a schematic diagram comparing the resonance curves of the speaker 100 shown in Figure 27 and a conventional speaker. It should be noted that the solid line in Figure 28 represents the resonance curve of the speaker 100 in this embodiment, and the dashed line represents the resonance curve of the conventional speaker 100.

[0123] As shown in Figures 27 and 28, in some embodiments, the top 11 of the shell 10 may also include a first part 113, a second part 114 and a transition part 115. The transition part 115 may be connected between the first part 113 and the second part 114. The heights of the first part 113 and the second part 114 are different, that is, there is a height difference between the first part 113 and the second part 114. Among them, the height L1 of the first part 113 refers to the distance between the first part 113 and the diaphragm 21 in the first direction, and so on. At this time, an avoidance space 11b can be formed between the second part 114 and the transition part 115 (Figure 20 also illustrates the avoidance space 11b from another angle).

[0124] For example, the height of the first portion 113 can be greater than the height of the second portion 114. That is, the first portion 113 of the top portion 11 can protrude relative to the second portion 114 in a direction away from the diaphragm 21. The height of the first portion 113 can be greater than or equal to 0.2 mm. For example, the height of the first portion 113 can be in the range of 0.2 mm to 0.3 mm.

[0125] For example, the sound outlet 11a of the housing 10 can be located in the first portion 113 of the top portion 11. The diameter of the sound outlet 11a can be in a range of 0.8 mm to 1.4 mm. The height of the sound outlet 11a (in this embodiment, the thickness of the first portion 113 of the top portion 11 in the first direction) can be in a range of 0.1 mm to 0.3 mm.

[0126] When the speaker 100 is applied to the electronic device 1000, the internal device 300 (e.g., a microphone, a sensor, etc.) of the electronic device 1000 can be stacked in a first direction with the second portion 114 of the top portion 11 of the housing 10. The first portion 113 of the top portion 11 can protrude relative to the second portion 114 in a direction toward the internal device 300.

[0127] It is understandable that, compared to existing speakers, to ensure the overall axisymmetric design of the speaker, the module thickness remains consistent, meaning that the distance from the top of the housing to the diaphragm remains essentially the same. This limits the speaker's thickness to the stacking of components within the electronic device 1000. In this embodiment, the top 11 of the housing 10 of the speaker 100 may include two portions, a first portion 113 and a second portion 114, of varying heights. The first portion 113 of the top 11 may be elevated relative to the second portion 114. The second portion 114 of the top 11 may be stacked with the internal components 300 of the electronic device 1000 in a first direction, with the first portion 113 of the top 11 protruding relative to the second portion 114 in a direction toward the internal components 300. This increases the volume of the front chamber 100a of the speaker 100 while maintaining the stacking of the internal components 300 within the electronic device 1000. Furthermore, the sound outlet 11a located in the first portion 113 of the top 11 may be closer to the sound outlet of the electronic device 1000. In other words, the shell 10 of the speaker 100 in this embodiment can be a variable height shell. By providing a shell 10 with parts of different heights (in this embodiment, the first part 113 and the second part 114 of the top 11), the volume of the front cavity 100a can be increased without affecting the stacking of the internal components 300 of the electronic device 1000, and the sound outlet 11a can be made closer to the sound outlet of the electronic device 1000, so that the speaker 100 can create an additional resonance peak in the high frequency band (as shown in Figure 28), thereby improving the sensitivity of the speaker 100 in the high frequency band and widening the bandwidth of the entire speaker 100, thereby obtaining a speaker 100 with better treble effect.

[0128] It should be noted that, in the absence of conflict, the features in the embodiments of this application can be combined with each other, and any combination of features in different embodiments is also within the scope of protection of this application. That is to say, the multiple embodiments described above can also be arbitrarily combined according to actual needs.

[0129] It should be noted that all the above drawings are for illustrative purposes only and do not represent the actual size of the product. Furthermore, the dimensional ratios between the components in the drawings are not intended to limit the actual product of the present application.

[0130] The above are only some of the embodiments of this application, and the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A loudspeaker (100), characterized in that: The speaker (100) comprises a first magnet (31), a second magnet (32), a diaphragm (21), a voice coil (22) and a first upper magnetic conductor (33), wherein the first magnet (31) is located on the inner side of the second magnet (32), the diaphragm (21) is opposite to and spaced from the first magnet (31) and the second magnet (32), the voice coil (22) is fixed to the surface of the diaphragm (21) facing the first magnet (31), the voice coil (22) is spaced from the first magnet (31) and the second magnet (32), and the projection of the voice coil (22) in a first direction overlaps with a part of the first magnet (31) and / or a part of the second magnet (32), and the first direction is the thickness direction of the speaker (100); The first upper magnetic conductor (33) is fixed to the surface of the first magnet (31) facing the diaphragm (21), the first upper magnetic conductor (33) is spaced apart from the diaphragm (21) and the voice coil (22), and a portion of the first upper magnetic conductor (33) is located on the inner side of the voice coil (22).

2. The loudspeaker (100) according to claim 1, characterized in that The width of the first upper magnetic conductor (33) is a first width (H1), and the first width (H1) is greater than or equal to 0.5 mm.

3. The loudspeaker (100) according to claim 2, characterized in that: The inner width of the voice coil (22) is a second width (H2), and the second width (H2) is greater than or equal to 0.6 millimeters.

4. The loudspeaker (100) according to claim 3, characterized in that: A difference between the first width (H1) and the second width (H2) is greater than or equal to 0.1 mm.

5. The loudspeaker (100) according to any one of claims 1 to 4, characterized in that: The distance between the inner peripheral side wall and the outer peripheral side wall of the voice coil (22) is a third width (H3), and the third width (H3) is greater than the thickness of the voice coil (22).

6. The loudspeaker (100) according to any one of claims 1 to 5, characterized in that: The winding plane of the voice coil (22) is perpendicular to the first direction.

7. The loudspeaker (100) according to any one of claims 1 to 6, characterized in that: The loudspeaker (100) further comprises a second upper magnetic conductor (34), wherein the second upper magnetic conductor (34) is fixed to a surface of the second magnet (32) facing the diaphragm (21), and the second upper magnetic conductor (34) is located on a side of the voice coil (22) facing away from the first upper magnetic conductor (33).

8. The loudspeaker (100) according to claim 7, characterized in that: The distance between the second upper magnetic conductor (34) and the voice coil (22) is greater than or equal to 0.05 mm.

9. The loudspeaker (100) according to claim 7 or 8, characterized in that: The second upper magnetic conductor (34) has a notch (34a), and the voice coil (22) is electrically connected to a power source through the notch (34a).

10. The loudspeaker (100) according to claim 9, characterized in that The second upper magnetic conductor (34) is provided with a first avoidance step (342a), the opening of the first avoidance step (342a) is formed on the surface of the second upper magnetic conductor (34) facing the second magnet (32) and the outer peripheral side surface of the second upper magnetic conductor (34), and the first avoidance step (342a) is connected to the notch (34a); The loudspeaker (100) further comprises a circuit board (40), at least a portion of which is located within the first avoidance step (342a), the voice coil (22) is electrically connected to the circuit board (40) via the notch (34a), and the circuit board (40) is electrically connected to the power supply.

11. The loudspeaker (100) according to any one of claims 1 to 10, characterized in that: The loudspeaker (100) further comprises a lower magnetic conductor (35), wherein the lower magnetic conductor (35) is fixedly connected to a surface of the first magnet (31) facing away from the diaphragm (21), and / or a surface of the second magnet (32) facing away from the diaphragm (21).

12. The loudspeaker (100) according to any one of claims 1 to 11, characterized in that: The diaphragm (21) comprises a first vibrating part (21a) and a second vibrating part (21b), the second vibrating part (21b) is ring-shaped, the first vibrating part (21a) is located inside the second vibrating part (21b) and is fixedly connected to the second vibrating part (21b), and the voice coil (22) is fixedly connected to the surface of the first vibrating part (21a) facing the first magnet (31); The first vibration part (21a) comprises a first straight part (211) and a first folding ring part (212); the first straight part (211) is ring-shaped; the first folding ring part (212) is located inside the first straight part (211) and is fixedly connected to the first straight part (211); the first folding ring part (212) protrudes relative to the first straight part (211) in a direction away from the first magnet (31); the first straight part (211) is connected between the second vibration part (21b) and the first folding ring part (212); And / or, the second vibrating portion (21b) comprises a second straight portion (213) and a second folded ring portion (214), the second folded ring portion (214) being connected between the second straight portion (213) and the first vibrating portion (21a), and the second folded ring portion (214) protruding relative to the second straight portion (213) in a direction away from the first magnet (31).

13. The loudspeaker (100) according to any one of claims 1 to 11, characterized in that: The diaphragm (21) comprises a first vibration part (21a) and a second vibration part (21b), the second vibration part (21b) is ring-shaped, the first vibration part (21a) is located inside the second vibration part (21b) and is fixedly connected to the second vibration part (21b); The first vibration part (21a) comprises a first connection part (215), a first main body part (216), a second connection part (217) and a second main body part (218); the first connection part (215), the first main body part (216) and the second connection part (217) are all ring-shaped; the second main body part (218) is located on the inner side of the first connection part (215) and is fixedly connected to the first connection part (215); the second connection part (217) is located on the outer side of the first connection part (215); the first main body part (216) is connected between the first connection part (215) and the second connection part (217); and the second connection part (217) is fixedly connected to the second vibration part (21b); In the first direction, the distance from the first main body (216) to the first magnet (31) is smaller than the distance from the second main body (218) to the first magnet (31); the voice coil (22) is embedded in the first main body (216); the surface of the voice coil (22) facing the first magnet (31) is exposed relative to the first main body (216); the inner width of the first connecting portion (215) is a fourth width (H4); and the fourth width (H4) is greater than or equal to 0.6 mm.

14. The loudspeaker (100) according to any one of claims 1 to 13, characterized in that: The loudspeaker (100) further comprises a shell (10), the shell (10) comprising a top (11) and a frame (12), the frame (12) being fixedly connected to the outer periphery of the top (11), the voice coil (22), the diaphragm (21), the first magnet (31), the second magnet (32) and the first upper magnetic conductor (33) being all accommodated inside the shell (10), and the space between the diaphragm (21) and the top (11) constitutes a front cavity (100a) of the loudspeaker (100); The top (11) comprises a first part (113), a second part (114) and a transition part (115); the transition part (115) is connected between the first part (113) and the second part (114); in the first direction, the distance from the first part (113) to the diaphragm (21) is greater than the distance from the second part (114) to the diaphragm (21); the first part (113) is provided with a sound outlet (11a); the sound outlet (11a) connects the front cavity (100a) with the external space of the speaker (100).

15. An electronic device (1000), characterized in that: The invention comprises a housing and a loudspeaker (100) according to any one of claims 1 to 14, wherein the loudspeaker (100) is accommodated inside the housing (200).

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