Sound production unit and electronic device

Abstract

The present invention relates to the technical field of electroacoustic transduction. Disclosed in the present invention are a sound production unit and an electronic device. The sound production unit comprises a housing and a magnetic circuit system, which is arranged in the housing and comprises a magnetically conductive yoke, a central magnetic portion and a side magnetic portion, wherein the central magnetic portion and the side magnetic portion are arranged on the magnetically conductive yoke, and the side magnetic portion is arranged on an outer side of the central magnetic portion; the central magnetic portion comprises central magnetic steel and a central magnetically conductive plate, with two opposite sides of the central magnetic steel being respectively connected to the central magnetically conductive plate and the magnetically conductive yoke; the side magnetic portion comprises side magnetic steel and a side magnetically conductive plate, with two opposite sides of the side magnetic steel being respectively connected to the side magnetically conductive plate and the magnetically conductive yoke; the central magnetically conductive plate and / or the side magnetically conductive plate are / is made of a cobalt alloy material; and the magnetically conductive yoke is also made of a cobalt alloy material. A thinned design of the sound production unit of the present invention is realized, and the magnetic induction intensity of the magnetic circuit system is also effectively improved, thereby increasing the BL value, and thus the acoustic performance requirement of the sound production unit can be met.

Description

Speaker units and electronics Technical Field

[0001] The present invention relates to the technical field of electroacoustic transducer technology, and in particular to a sound-generating unit and an electronic device using the sound-generating unit. Background Art

[0002] With the rapid development of technology, people are increasingly using electronic devices such as mobile phones, and at the same time, they are placing higher and higher demands on the performance of speakers in these devices. This is not limited to video and audio playback, but also places higher demands on the sound quality and reliability of the sound played. As users' demand for thinner and lighter electronic devices grows, the size of sound-generating components such as speakers in these devices is becoming smaller and smaller due to the external structure of the electronic devices. As an important and indispensable functional component of electronic devices, sound-generating components are a key part of the thin and light design of electronic devices. Therefore, the thin and light design of sound-generating components is extremely important.

[0003] In related technologies, when electronic equipment is designed to be miniaturized and lightweight, the magnetic circuit system of the sound-generating device is mainly thinned. However, after the magnetic circuit system of the sound-generating device is thinned, it cannot meet the magnetic field strength requirements, resulting in a decrease in the BL value, thereby affecting the acoustic performance and sound effect, resulting in a situation where lightweight design and sound performance cannot be taken into account at the same time.

[0004] Summary of the Invention

[0005] The main purpose of the present invention is to provide a sound-emitting unit and an electronic device, aiming to provide a sound-emitting unit that meets the requirements of both thinness and acoustic performance.

[0006] To achieve the above objectives, the present invention provides a sound-emitting unit, comprising:

[0007] housing; and

[0008] A magnetic circuit system is provided in the outer shell, and the magnetic circuit system includes a magnetic yoke, a central magnetic part and a side magnetic part. The central magnetic part and the side magnetic part are respectively provided on the magnetic yoke, and the side magnetic part is provided on the outside of the central magnetic part. The central magnetic part includes a central magnetic steel and a central magnetic plate. The opposite sides of the central magnetic steel are respectively connected to the central magnetic plate and the magnetic yoke. The side magnetic part includes a side magnetic steel and a side magnetic plate. The opposite sides of the side magnetic steel are respectively connected to the side magnetic plate and the magnetic yoke. The central magnetic plate and / or the side magnetic plate are composed of a cobalt alloy material, and the magnetic yoke is composed of the cobalt alloy material.

[0009] In one embodiment, the material grade of the cobalt alloy material in the central magnetic conductive plate is Co50 or Co27;

[0010] And / or, the material grade of the cobalt alloy material in the edge magnetic conductive plate is Co50 or Co27.

[0011] In one embodiment, the material grade of the cobalt alloy in the magnetic yoke is Co50 or Co27.

[0012] In one embodiment, the sound unit also includes a vibration system, the vibration system includes a diaphragm, the diaphragm includes a folding ring portion and an inner fixing portion and an outer fixing portion arranged on the inner and outer sides of the folding ring portion, the outer fixing portion is connected to the outer shell, the folding ring portion is recessed in the direction close to the side magnetic conductive plate, and the side magnetic conductive plate is provided with a first avoidance groove opposite to the folding ring portion and extending in the direction away from the diaphragm, and the depth of the first avoidance groove is not greater than 0.1 mm.

[0013] In one embodiment, the side magnetic portion and the center magnetic portion are spaced apart to form a magnetic gap, the sound unit also includes a vibration system, the vibration system includes a diaphragm assembly, a voice coil and a centering assembly, the outer periphery of the diaphragm assembly is fixed to the outer shell, the first end of the voice coil is connected to the diaphragm assembly, the second end of the voice coil is inserted into the magnetic gap, the two ends of the centering assembly are respectively connected to the second end of the voice coil and the outer shell, the magnetic yoke is provided with a second avoidance groove opposite to the centering assembly, the second avoidance groove extends in a direction away from the centering assembly, and the depth of the second avoidance groove is between 0.05mm and 0.15mm.

[0014] In one embodiment, the diaphragm assembly includes a diaphragm and a vibration plate, the outer periphery of the diaphragm is connected to the outer shell, the vibration plate is connected to the diaphragm and to the first end of the voice coil, the vibration plate includes a main body and a pressure edge portion provided on the outer periphery of the main body, the pressure edge portion is bent relative to the main body toward the direction close to the magnetic circuit system, an internal fixing portion is provided on the inner side of the diaphragm, the internal fixing portion is connected to the pressure edge portion, and the top surface of the internal fixing portion and the main body are located in the same plane.

[0015] In one embodiment, the magnetic permeability of the cobalt alloy material in any one of the magnetic yoke, the central magnetic plate, and the side magnetic plate is not less than 5200 Gs / Oe;

[0016] And / or, the saturation magnetic induction intensity B of the cobalt alloy material in any one of the magnetic yoke, the central magnetic plate and the side magnetic plate is not less than 2.25T.

[0017] In one embodiment, at least a portion of the shell is made of a cobalt alloy material, and the material grade of the cobalt alloy material in the shell is Co50 or Co27.

[0018] In one embodiment, the shell includes a first side portion and a second side portion connected end to end, the first side portion is formed as a cobalt alloy material, the second side portion is formed as a plastic material, the second side portion is provided with a sound hole connected to the internal sound cavity of the shell, the shell also includes a mesh assembly covering the sound hole, and the mesh assembly is bonded to the second side portion or integrally injection molded.

[0019] In one embodiment, the side magnetic conductive plate includes a first side magnetic conductive plate located at the first side portion and a second side magnetic conductive plate located at the second side portion, and the first side magnetic conductive plate and the first side portion are formed as an integrally formed part.

[0020] In one embodiment, the shell includes a first side portion, a second side portion and a connecting portion, the intersection of the first side portion and the second side portion forms a corner portion, the connecting portion is located at the corner portion and is respectively connected to the first side portion and the second side portion, the connecting portion is formed as a plastic material piece, and the first side portion and the second side portion are formed as a cobalt alloy material piece.

[0021] In one embodiment, the side magnetic conductive plate includes a first side magnetic conductive plate located at the first side portion and a second side magnetic conductive plate located at the second side portion, the first side magnetic conductive plate and the first side portion are formed as an integrally formed part, and the second side magnetic conductive plate and the second side portion are formed as an integrally formed part.

[0022] In one embodiment, the thickness of the edge magnetic conductive plate is not greater than 0.23 mm;

[0023] And / or, the thickness of the central magnetic conductive plate is not greater than 0.23 mm;

[0024] And / or, the thickness of the magnetic yoke is not greater than 0.23 mm.

[0025] In one embodiment, the height of the sound unit is no more than 1.8 mm.

[0026] The present invention also provides an electronic device comprising the above-mentioned sound-emitting unit.

[0027] The sound-emitting unit of the technical solution of the present invention is configured to have a magnetic circuit system arranged in an outer shell to achieve fixed assembly of the magnetic circuit system, and to configure the magnetic circuit system to include a magnetic yoke, a central magnetic part and a side magnetic part, so that the central magnetic part and the side magnetic part are respectively arranged on the magnetic yoke, and the side magnetic part is arranged on the outside of the central magnetic part, and the opposite sides of the central magnetic steel of the central magnetic part are respectively connected to the central magnetic plate and the magnetic yoke, and the opposite sides of the side magnetic steel of the side magnetic part are respectively connected to the side magnetic plate and the magnetic yoke, and the central magnetic plate and / or the side magnetic plate are composed of a cobalt alloy material, and the magnetic yoke is composed of the cobalt alloy material, thereby utilizing the high saturation magnetic induction intensity of the central magnetic plate and / or the side magnetic plate of the magnetic circuit system to cooperate with the high saturation magnetic induction intensity of the magnetic yoke to effectively meet the magnetic field strength requirement of the magnetic circuit system, so that the sound-emitting unit can effectively improve the saturation magnetic induction intensity of the magnetic material under the condition of a certain size, thereby improving the BL value, and improving the acoustic performance and sound effect of the sound-emitting unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without any creative work.

[0029] FIG1 is an exploded schematic diagram of a sound-emitting unit according to an embodiment of the present invention;

[0030] FIG2 is a partial cross-sectional schematic diagram of a sound-emitting unit according to an embodiment of the present invention;

[0031] FIG3 is a schematic structural diagram of a magnetic yoke according to an embodiment of the present invention;

[0032] FIG4 is a schematic diagram of a top view of the housing in one embodiment of the present invention;

[0033] FIG5 is a schematic structural diagram of a housing according to an embodiment of the present invention;

[0034] FIG6 is a schematic structural diagram of a housing in another embodiment of the present invention.

[0035] Description of Figure Numbers:

[0036] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0038] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0039] At the same time, the meaning of "and / or" or "and / or" appearing in the full text includes three options. Taking "A and / or B" as an example, it includes option A, or option B, or an option in which both A and B are satisfied.

[0040] In addition, in the present invention, descriptions such as "first" and "second" are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0041] The present invention provides a sound unit 100. It is understood that the sound unit 100 is applicable to electronic devices, such as mobile phones, speakers, computers, headphones, watches, or televisions, without limitation. In this embodiment, the sound unit 100 is constructed of a high-permeability material to enhance the magnetic induction intensity of the magnetic circuit system 2 of the sound unit 100, thereby increasing the BL value. This allows the magnetic circuit system 2 of the sound unit 100 to meet the magnetic field strength requirements after being thinned, effectively improving acoustic performance and sound quality.

[0042] Please refer to Figures 1 to 6. In an embodiment of the present invention, the sound unit 100 includes a shell 1 and a magnetic circuit system 2, wherein the magnetic circuit system 2 is arranged in the shell 1, and the magnetic circuit system 2 includes a magnetic yoke 21, a central magnetic part 22 and a side magnetic part 23. The central magnetic part 22 and the side magnetic part 23 are respectively arranged on the magnetic yoke 21, and the side magnetic part 23 is arranged on the outside of the central magnetic part 22. The central magnetic part 22 includes a central magnetic steel 221 and a central magnetic plate 222. The opposite sides of the central magnetic steel 221 are respectively connected to the central magnetic plate 222 and the magnetic yoke 21. The side magnetic part 23 includes a side magnetic steel 231 and a side magnetic plate 232. The opposite sides of the side magnetic steel 231 are respectively connected to the side magnetic plate 232 and the magnetic yoke 21. The central magnetic plate 222 and / or the side magnetic plate 232 are composed of cobalt alloy material, and the magnetic yoke 21 is composed of cobalt alloy material.

[0043] In this embodiment, the housing 1 of the sound unit 100 is used to mount, secure, support, and protect components such as the magnetic circuit system 2. In other words, the housing 1 provides a mounting base for the magnetic circuit system 2 and other components. It is understood that the housing 1 may be a structure such as a mounting shell, a housing, a frame, or a box having a mounting cavity. In other words, the housing 1 defines a receiving space, or has a cavity, which is not limited here.

[0044] Optionally, the housing 1 has a rectangular frame structure, having two opposing long sides and two short sides, with the ends of the short sides connected to the two long sides, and the ends of the long sides connected to the two short sides, so that the housing 1 defines a cavity. Of course, the housing 1 can also have a circular or basin-shaped structure to adapt to different terminals or electronic devices. It is understood that the housing 1 can be a metal part, an injection molded part, or a metal and plastic part integrally injection molded.

[0045] In this embodiment, as shown in Figures 1, 2, 4 to 6, the magnetic circuit system 2 is provided in the outer shell 1, and the central magnetic part 22 and the side magnetic part 23 of the magnetic circuit system 2 are respectively provided on the magnetic yoke 21, and the side magnetic part 23 is provided on the outside of the central magnetic part 22. As shown in Figures 1 to 3, the magnetic yoke 21 can be a magnetic flat plate or a magnetic basin frame and other structures, which are not limited here. The magnetic yoke 21 is used to support and install the central magnetic part 22 and the side magnetic part 23. The magnetic circuit system 2 is fixedly connected to the outer shell 1 through the side magnetic part 23. Optionally, the magnetic yoke 21 is bonded to the central magnetic part 22 and the side magnetic part 23, and the side magnetic part 23 is bonded to the outer shell 1.

[0046] It can be understood that the central magnetic portion 22 includes a stacked central magnetic steel 221 and a central magnetic plate 222, and the central magnetic steel 221 is arranged between the central magnetic plate 222 and the magnetic yoke 21. Optionally, the central magnetic plate 222 can be a magnetic flat plate structure. The structural profiles of the central magnetic steel 221 and the central magnetic plate 222 are the same, and the central magnetic steel 221 and the central magnetic plate 222 can be a plate-shaped structure or a ring-shaped structure, which is not limited here. The side magnetic portion 23 includes a stacked side magnetic steel 231 and a side magnetic plate 232, and the side magnetic steel 231 is sandwiched between the side magnetic plate 232 and the magnetic yoke 21. The side magnetic steel 231 and the side magnetic plate 232 are located on the outside of the central magnetic steel 221 and the central magnetic plate 222, and are separated to form a magnetic gap 24. Optionally, the side magnetic steel 231 is a permanent magnet. The side magnetic plate 232 is a magnetic flat plate.

[0047] It should be noted that the side magnetic steels 231 and the side magnetic conductive plates 232 can optionally be annular structures, such that the side magnetic steels 231 and the side magnetic conductive plates 232 are arranged in a ring around the outside of the central magnetic portion 22. Of course, in other embodiments, each of the side magnetic steels 231 and the side magnetic conductive plates 232 includes multiple side magnetic steels 231 and the side magnetic conductive plates 232, and the multiple side magnetic steels 231 and the multiple side magnetic conductive plates 232 are arranged at intervals and arranged around the central magnetic portion 22 to form a magnetic gap 24, which is not limited here. Optionally, the side magnetic steels 231 and the side magnetic conductive plates 232 have the same shape, structure and contour.

[0048] Of course, in other embodiments, the side magnetic steels 231 include multiple side magnetic steels 231, and the multiple side magnetic steels 231 are arranged at intervals and arranged around the central magnetic part 22, and the side magnetic conductive plate 232 has a ring structure, which is not limited here.

[0049] In this embodiment, by making the central magnetic conductive plate 222 and / or the side magnetic conductive plate 232 consist of a cobalt alloy material, that is, the central magnetic conductive plate 222 and / or the side magnetic conductive plate 232 adopts a high magnetic permeability material (cobalt alloy material), the saturation magnetic induction intensity of the central magnetic conductive plate 222 and / or the side magnetic conductive plate 232 can be effectively improved. In this way, when the size is certain, the greater the saturation magnetic induction intensity of the central magnetic conductive plate 222 and / or the side magnetic conductive plate 232, the greater the BL value and the better the performance, so that the magnetic circuit system 2 can meet the magnetic field strength requirements after thinning, effectively improve the saturation magnetic induction intensity of the magnetic conductive material, thereby improving the BL value, and improving the acoustic performance and sound effect.

[0050] It should be noted that cobalt alloy material is a highly magnetic material with a strong saturation magnetic induction intensity. Under the condition of a certain size, the greater the saturation magnetic induction intensity of the magnetic material, the larger the BL value and the better the performance.

[0051] Optionally, the central magnetic conductive plate 222 is made of a cobalt alloy material; or, the side magnetic conductive plates 232 are made of a cobalt alloy material; or, both the central magnetic conductive plate 222 and the side magnetic conductive plates 232 are made of a cobalt alloy material, which is not limited here.

[0052] In this embodiment, the magnetic yoke 21 is composed of a cobalt alloy material. It is understandable that by setting the magnetic yoke 21 to be composed of a cobalt alloy material, that is, the magnetic yoke 21 uses a high magnetic permeability material (cobalt alloy material), the saturation magnetic induction intensity of the magnetic yoke 21 can be effectively improved. In this way, under the condition of a certain size, the greater the saturation magnetic induction intensity of the magnetic yoke 21, the greater the BL value and the better the performance. Therefore, the magnetic circuit system 2 can meet the magnetic field strength requirements after thinning, effectively improving the magnetic induction intensity of the magnetic circuit system 2, thereby improving the BL value, and improving the acoustic performance and sound effect of the sound unit 100.

[0053] Optionally, the central magnetic plate 222 and the magnetic yoke 21 are composed of cobalt alloy material; or, the side magnetic plate 232 and the magnetic yoke 21 are composed of cobalt alloy material; or, the central magnetic plate 222, the side magnetic plate 232 and the magnetic yoke 21 are all composed of cobalt alloy material, which is not limited here.

[0054] The sound-emitting unit 100 of the present invention is provided with a magnetic circuit system 2 in the housing 1 to realize the fixed assembly of the magnetic circuit system 2, and the magnetic circuit system 2 is provided with a magnetic yoke 21, a central magnetic part 22 and a side magnetic part 23, so that the central magnetic part 22 and the side magnetic part 23 are respectively provided on the magnetic yoke 21, and the side magnetic part 23 is provided on the outside of the central magnetic part 22, by connecting the opposite sides of the central magnetic steel 221 of the central magnetic part 22 to the central magnetic plate 222 and the magnetic yoke 21 respectively, and the side magnetic part 23 is provided on the outside of the central magnetic part 22. The opposite sides of the magnetic steel 231 are respectively connected to the side magnetic conductive plates 232 and the magnetic yoke 21. By making the central magnetic conductive plate 221 and / or the side magnetic conductive plate 231 composed of a cobalt alloy material, and the magnetic yoke 21 composed of the said cobalt alloy material, the high saturation magnetic induction intensity of the central magnetic conductive plate 221 and / or the side magnetic conductive plate 231 of the magnetic circuit system 2 is combined with the high saturation magnetic induction intensity of the magnetic yoke 21 to effectively meet the magnetic field strength requirements of the magnetic circuit system 2, so that the sound unit 100 can effectively improve the magnetic induction intensity of the magnetic circuit system 2 under the condition of a certain size, thereby improving the BL value and improving the acoustic performance and sound effect of the sound unit 100.

[0055] In one embodiment, the cobalt alloy material in the central magnetic conductive plate 222 is made of Co50 or Co27.

[0056] It should be noted that Co50 is a commonly used soft magnetic alloy material that has the ability to quickly flip the direction of its own magnetic vector in a magnetic field. Co50 has the characteristics of high magnetic permeability, low iron loss, and good thermal stability. Magnetic permeability is one of the important performance indicators of soft magnetic alloys, which refers to the magnetic conductivity of the material under the action of a magnetic field. The higher the magnetic permeability, the stronger the material's response to the magnetic field. Co27 is a soft magnetic alloy with high saturation and high Curie temperature. Co27 has strong mechanical toughness, good ductility and high saturation magnetic induction intensity. Compared with Co50 alloy, Co27 alloy has better permeability and does not show the brittleness of Co50 alloy.

[0057] It can be understood that by making the central magnetic plate 222 composed of a cobalt alloy material of Co50 or Co27, the central magnetic plate 222 has a higher magnetic permeability, thereby utilizing the high saturation magnetic induction intensity of the magnetic yoke 21 and the high saturation magnetic induction intensity of the central magnetic plate 222 to cooperate with each other to effectively meet the magnetic field strength requirements of the magnetic circuit system 2, so that the sound unit 100 can meet the magnetic field strength requirements when the size is certain, that is, the magnetic circuit system 2 in the sound unit 100 can meet the magnetic field strength requirements after thinning, effectively improving the magnetic induction intensity of the magnetic circuit system 2, thereby improving the BL value, and improving the acoustic performance and sound effect of the sound unit 100.

[0058] In one embodiment, the cobalt alloy material in the side magnetic conductive plate 232 is made of Co50 or Co27.

[0059] It should be noted that Co50 is a commonly used soft magnetic alloy material that has the ability to quickly flip the direction of its own magnetic vector in a magnetic field. Co50 has the characteristics of high magnetic permeability, low iron loss, and good thermal stability. Magnetic permeability is one of the important performance indicators of soft magnetic alloys, which refers to the magnetic conductivity of the material under the action of a magnetic field. The higher the magnetic permeability, the stronger the material's response to the magnetic field. Co27 is a soft magnetic alloy with high saturation and high Curie temperature. Co27 has good mechanical toughness, good ductility and high saturation magnetic induction intensity. Compared with Co50 alloy, Co27 alloy has better permeability and does not show the brittleness of Co50 alloy.

[0060] It can be understood that by making the side magnetic plate 232 composed of a cobalt alloy material of Co50 or Co27, the side magnetic plate 232 has a higher magnetic permeability, thereby utilizing the high saturation magnetic induction intensity of the magnetic yoke 21 and the high saturation magnetic induction intensity of the side magnetic plate 232 to cooperate with each other to effectively meet the magnetic field strength requirements of the magnetic circuit system 2, so that the sound unit 100 can meet the magnetic field strength requirements when the size is certain, that is, the magnetic circuit system 2 in the sound unit 100 can meet the magnetic field strength requirements after thinning, effectively improving the magnetic induction intensity of the magnetic circuit system 2, thereby improving the BL value, and improving the acoustic performance and sound effect of the sound unit 100.

[0061] In one embodiment, the material grade of the cobalt alloy in the magnetic yoke 21 is Co50 or Co27. It should be noted that Co50 is a commonly used soft magnetic alloy material that can quickly flip the direction of its own magnetic vector in a magnetic field. Co50 has the characteristics of high magnetic permeability, low iron loss, and good thermal stability. Magnetic permeability is one of the important performance indicators of soft magnetic alloys, which refers to the magnetic conductivity of the material under the action of a magnetic field. The higher the magnetic permeability, the stronger the material's response to the magnetic field. Co27 is a soft magnetic alloy with high saturation and high Curie temperature. Co27 has good mechanical toughness, good ductility and high saturation magnetic induction intensity. Compared with Co50 alloy, Co27 alloy has better permeability and does not show the brittleness of Co50 alloy.

[0062] It can be understood that by making the magnetic yoke 21 composed of a cobalt alloy material of Co50 or Co27, the magnetic yoke 21 has a higher magnetic permeability, so that the high saturation magnetic induction intensity of the magnetic yoke 21 is used in conjunction with the central magnetic steel 221 and the side magnetic steel 231 of the magnetic circuit system 2 to effectively meet the magnetic field strength requirements of the magnetic circuit system 2, so that the sound unit 100 can meet the magnetic field strength requirements when the size is certain, that is, the magnetic circuit system 2 in the sound unit 100 can meet the magnetic field strength requirements after thinning, effectively improving the magnetic induction intensity of the magnetic circuit system 2, thereby improving the BL value, and improving the acoustic performance and sound effect of the sound unit 100.

[0063] Optionally, the material grade of the cobalt alloy material in the central magnetic conductive plate 222 is Co50 or Co27, and the material grade of the cobalt alloy material in the side magnetic conductive plate 232 is Co50 or Co27. It can be understood that by making the magnetic yoke 21, the central magnetic plate 222, and the side magnetic plate 232 composed of a cobalt alloy material of Co50 or Co27, the magnetic yoke 21, the central magnetic plate 222, and the side magnetic plate 232 have a strong magnetic permeability, and the side magnetic part 23 of the magnetic circuit system 2 is connected to the shell 1, so as to utilize the high saturation magnetic induction intensity of the magnetic yoke 21, the central magnetic plate 222, and the side magnetic plate 232 to cooperate with the central magnetic steel 221 and the side magnetic steel 231 of the magnetic circuit system 2 to effectively meet the magnetic field strength requirement of the magnetic circuit system 2, so that the sound unit 100 can meet the magnetic field strength requirement when the size is certain, that is, the magnetic circuit system 2 in the sound unit 100 can meet the magnetic field strength requirement after thinning, effectively improving the magnetic induction intensity of the magnetic circuit system 2, thereby improving the BL value, and improving the acoustic performance and sound effect of the sound unit 100.

[0064] In one embodiment, the sound unit 100 also includes a vibration system 3, which includes a diaphragm 311. The diaphragm 311 includes a folding ring portion 3111 and an inner fixing portion 3112 and an outer fixing portion 3113 arranged on the inner and outer sides of the folding ring portion 3111. The outer fixing portion 3113 is connected to the outer shell 1. The folding ring portion 3111 is recessed in the direction close to the edge magnetic conductive plate 232. The edge magnetic conductive plate 232 is provided with a first avoidance groove 233 opposite to the folding ring portion 3111 and extending in the direction away from the diaphragm 311. The depth of the first avoidance groove 233 is not greater than 0.1 mm.

[0065] In this embodiment, as shown in Figures 1, 2, and 4 to 6, the housing 1 is configured as a frame and defines a cavity with openings at both ends. The magnetic circuit system 2 is connected to the housing 1 via a side magnetic conductive plate 232 to seal the opening at one end of the cavity. The vibration system 3 is connected to the housing 1 via a diaphragm 311 to seal the opening at the other end of the cavity. Thus, the housing 1, magnetic circuit system 2, and vibration system 3 enclose a vibration space. It will be appreciated that the vibration system 3 also includes a voice coil 32 located within the vibration space. One end of the voice coil 32 is connected to the diaphragm 311, and the other end of the voice coil 32 is suspended within the magnetic gap 24 of the magnetic circuit system 2.

[0066] It should be noted that by introducing current from an external circuit into the voice coil 32, the voice coil 32 transmits electrical energy to the magnetic gap 24 of the magnetic circuit system 2, causing the magnetic field generated by the magnetic circuit system 2 to convert the electrical energy into mechanical energy, thereby causing the voice coil 32 to vibrate, driving the diaphragm 311 to vibrate and produce sound, further converting the mechanical energy into sound energy. It is understandable that after receiving the external alternating current signal, the voice coil 32, located in the magnetic gap, is driven by the magnetic field force of the magnetic circuit system 2 to reciprocate and cut through the magnetic lines of force, driving the diaphragm 311 of the vibration system 3 to vibrate and produce sound, thereby effectively improving the BL value of the sound-producing unit 100.

[0067] In this embodiment, the diaphragm 311's fold 3111 surrounds the inner fixing portion 3112, and the outer fixing portion 3113 surrounds the fold 3111 and is located outside the fold 3111. Optionally, the inner fixing portion 3112, fold 3111, and outer fixing portion 3113 of the diaphragm 311 are integrally formed. The diaphragm 311 is connected and fixed to the housing 1 of the sound unit 100 via the outer fixing portion 3113, thereby improving the stability and sealing of the connection between the housing 1 and the diaphragm 311.

[0068] It can be understood that in order to increase the effective vibration area of ​​the diaphragm 311, the external fixing portion 3113 can be formed by extending downward or upward from the outer side of the folding ring portion 3111, or an extension portion can be formed by extending downward or upward from the outer side of the external fixing portion 3113, so that the external fixing portion 3113 is connected and fixed to the inner wall or outer wall of the outer shell 1.

[0069] In this embodiment, as shown in Figures 1 to 5 , the edge portion 3111 is recessed toward the side magnetic plate 232, thereby reducing the overall vibration height of the vibration system 3, thereby facilitating a thinner design for the sound unit 100. A first avoidance groove 233 is provided on the side magnetic plate 232, opposite the edge portion 3111 and extending away from the diaphragm 311, with a depth of no greater than 0.1 mm. This effectively provides space for the edge portion 3111 of the diaphragm 311 to escape during vibration, preventing collision between the edge portion 3111 and the side magnetic plate 232, which could affect the sound quality. Furthermore, the provision of the first avoidance groove 233 also reduces the weight of the magnetic circuit system 2. Moreover, since the side magnetic conductive plate 232 is made of cobalt alloy material, by setting the depth of the first avoidance groove 233 to be no more than 0.1 mm, the processing difficulty of the first avoidance groove 233 can be reduced while meeting the avoidance requirement of the folded ring portion 3111, thereby saving production costs.

[0070] It is understood that the first avoidance groove 233 is formed by the side magnetic conductive plate 232 being recessed in a direction away from the diaphragm 311. The depth of the first avoidance groove 233 is the height along the vibration direction of the diaphragm 311. Optionally, the depth of the first avoidance groove 233 is 0.01 mm, 0.02 mm, 0.03 mm, 0.04 mm, 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm, 0.09 mm, 0.1 mm, etc., which is not limited here.

[0071] In one embodiment, the side magnetic portion 23 and the center magnetic portion 22 are spaced apart to form a magnetic gap 24. The sound unit 100 also includes a vibration system 3. The vibration system 3 includes a diaphragm assembly 31, a voice coil 32 and a centering assembly 33. The outer periphery of the diaphragm assembly 31 is fixed to the outer shell 1, the first end 321 of the voice coil 32 is connected to the diaphragm assembly 31, and the second end 322 of the voice coil 32 is inserted into the magnetic gap 24. The two ends of the centering assembly 33 are respectively connected to the second end 322 of the voice coil 32 and the outer shell 1. The magnetic yoke 21 is provided with a second avoidance groove 211 opposite to the centering assembly 33. The second avoidance groove 211 extends in a direction away from the centering assembly 33. The depth of the second avoidance groove 211 is between 0.05 mm and 0.15 mm.

[0072] In this embodiment, as shown in Figures 1 to 3, the vibration system 3 is fixed to the housing 1 via the outer periphery of the diaphragm assembly 31, so that the diaphragm assembly 31 is opposite and spaced apart from the magnetic circuit system 2. The first end 321 of the voice coil 32 is connected to the diaphragm assembly 31, and the second end 322 of the voice coil 32 is inserted into the magnetic gap 24. In this way, current from the external circuit is introduced into the voice coil 32, and the voice coil 32 transmits electrical energy to the magnetic gap 24 of the magnetic circuit system 2. The magnetic field generated by the magnetic circuit system 2 converts the electrical energy into mechanical energy, thereby causing the voice coil 32 to vibrate, driving the diaphragm assembly 31 to vibrate and produce sound, further converting the mechanical energy into acoustic energy.

[0073] It can be understood that after the voice coil 32 arranged in the magnetic gap receives the external changing AC signal, it moves back and forth to cut the magnetic lines of force driven by the magnetic field force of the magnetic circuit system 2, driving the diaphragm assembly 31 of the vibration system 3 to vibrate and make sound.

[0074] In this embodiment, a centering component 33 is provided so that the two ends of the centering component 33 are respectively connected to the second end 322 of the voice coil 32 and the outer shell 1, so that the centering component 33 is used to balance and stabilize the vibration of the diaphragm assembly 31 driven by the voice coil 32, thereby preventing the voice coil 32 from driving the diaphragm assembly 31 to swing or polarize.

[0075] It is understood that centering component 33 may be a centering damper and / or an auxiliary diaphragm. Alternatively, centering component 33 may be a centering damper. In this embodiment, the centering damper includes a first fixing portion, a second fixing portion, and an elastic portion connected between the first and second fixing portions. The first fixing portion is connected to the housing 1, and the second fixing portion is connected to the voice coil 32.

[0076] Optionally, the centering support is made of PI material. This allows the support to be made thinner, saving material and installation space, thereby effectively increasing the volume of the magnetic circuit system 2 and improving the product's BL value. Optionally, the centering support can be a single-layer structure. Of course, in other embodiments, the centering support can also be a multi-layered composite structure, which is not limited here.

[0077] Optionally, the centering support can be composed of one or more layers of material. When using a single layer, the hardness and thickness of the material can be selected to match the length of the elastic portion. In contrast, when using multiple layers, each layer can be made of a material with a lower elastic modulus. This flexible design facilitates the selection of a lightweight design, which improves product performance.

[0078] In order to further increase the elongation of the centering support, in one embodiment, the elastic portion includes two elastic arms and a bent portion connecting the two elastic arms. The bent portion and the two elastic arms enclose an elastic space, and the ends of the two elastic arms away from the bent portion are respectively connected to the first fixed portion and the second fixed portion. It can be understood that such a setting can effectively increase the arm length of the elastic portion and improve the elasticity and elastic deformation performance of the centering support. It should be noted that when the centering support is set in this way and is in a static state, the elastic arm of the centering support can be made very short, so that more space can be used to expand the size of the magnet in the magnetic circuit system 2 and improve product performance.

[0079] In one embodiment, multiple dampers are provided, and magnetic circuit system 2 is provided with multiple communication gaps that connect to magnetic gap 24, with each damper corresponding to a communication gap. In this embodiment, the damper includes a first fixing portion, a second fixing portion, and an elastic portion connected between the first and second fixing portions. The first fixing portion is connected to housing 1, and the second fixing portion is connected to the side of voice coil 32 facing away from diaphragm 311.

[0080] It can be understood that the centering support plate can be a large integral structure. The first fixing part can be optionally an annular structure and connected to the housing 1. The second fixing part is connected to the end of the voice coil 32 facing away from the diaphragm 311. The second fixing part is connected to the first fixing part through an elastic part. In this way, when the voice coil 32 vibrates, the second fixing part drives the elastic part to deform, so as to prevent the voice coil 32 from driving the diaphragm 311 to swing or polarize.

[0081] Of course, in other embodiments, the centering dampers may be multiple small components, for example, including two or four dampers. When there are two dampers, the two dampers are symmetrically arranged and connected to the two minor axes or two major axes of housing 1, without limitation. When there are four dampers, the four dampers are respectively positioned at the four corners of housing 1 to ensure symmetry and thus balanced vibration of voice coil 32 of speaker 100. Optionally, there are four dampers, each corresponding to the four connecting openings of magnetic circuit system 2.

[0082] In this embodiment, a second avoidance groove 211 is provided on the magnetic yoke 21, opposite to the centering assembly 33, so that the second avoidance groove 211 extends away from the centering assembly 33, and the depth of the second avoidance groove 211 is between 0.05 mm and 0.15 mm. This configuration effectively utilizes the second avoidance groove 211 of the magnetic yoke 21 to provide a space for the centering assembly 33 to avoid vibration. At the same time, the provision of the second avoidance groove 211 can reduce the weight of the magnetic circuit system 2. Moreover, since the magnetic yoke 21 is made of cobalt alloy material, by setting the depth of the second avoidance groove 211 between 0.05 mm and 0.15 mm, the processing difficulty of the second avoidance groove 211 can be reduced while meeting the requirement for avoiding the centering assembly 33, thereby saving production costs.

[0083] It is understood that the second avoidance groove 211 is formed by the magnetic yoke 21 being recessed in a direction away from the centering assembly 33. The depth of the second avoidance groove 211 is the height along the vibration direction of the diaphragm 311. Optionally, the depth of the second avoidance groove 211 is 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm, 0.09 mm, 0.1 mm, 0.11 mm, 0.12 mm, 0.13 mm, 0.14 mm, 0.15 mm, etc., which is not limited here.

[0084] In one embodiment, the diaphragm assembly 31 includes a diaphragm 311 and a vibration plate 312, the outer periphery of the diaphragm 311 is connected to the outer shell 1, the vibration plate 312 is connected to the diaphragm 311 and to the first end 321 of the voice coil 32, the vibration plate 312 includes a main body 3121 and a pressure edge portion 3122 provided on the outer periphery of the main body 3121, the pressure edge portion 3122 is bent relative to the main body 3121 toward the direction close to the magnetic circuit system 2, and an internal fixing portion 3112 is provided on the inner side of the diaphragm 311, the internal fixing portion 3112 is connected to the pressure edge portion 3122, and the top surface of the internal fixing portion 3112 and the main body 3121 are located in the same plane.

[0085] In this embodiment, as shown in Figures 1 and 2, a hollow hole is provided in the center of the diaphragm 311, and the vibration plate 312 is connected to the inner fixing portion 3112 in the center of the diaphragm 311, covering the hollow hole. It can be understood that by providing a hollow hole in the center of the diaphragm 311, the overall weight of the diaphragm 311 can be effectively reduced. Optionally, a hollow hole is provided in the center of the diaphragm 311, and the hollow hole can be a through hole, a hollow hole, or an opening. Optionally, there can be one or more hollow holes, which is not limited here.

[0086] In order to strengthen the structural strength of the diaphragm 311 and prevent the diaphragm 311 from shrinking and deforming more during vibration, a vibration plate 312 is provided in the center of the diaphragm 311. The vibration plate 312 is connected to the inner fixed part 3112 in the center of the diaphragm 311 and covers the hollow hole to strengthen the structural strength of the diaphragm 311 and meet the modulus and strength requirements of the diaphragm 311.

[0087] In this embodiment, the diaphragm 312 is configured as a main body 3121 with a bead 3122 disposed on the outer periphery of the main body 3121. The bead 3122 bends relative to the main body 3121 toward the magnetic circuit system 2. The inner fixing portion 3112 on the inner side of the diaphragm 311 is connected to the bead 3122, and the top surfaces of the inner fixing portion 3112 and the main body 3121 lie in the same plane. This effectively reduces the height of the sound unit 100 in the vibration direction, thereby achieving a thinner design.

[0088] Optionally, the diaphragm 311 is made of rubber material. Compared with conventional thermoplastic materials (such as PEEK, TPU, TPEE, etc.), rubber has better temperature resistance and higher damping. The sound unit 100 using the rubber material diaphragm 311 can meet the requirements of high power, high temperature resistance and other products.

[0089] In one embodiment, the magnetic permeability of the cobalt alloy material in any of the magnetic yoke 21, the central magnetic plate 222, and the side magnetic plates 232 is no less than 5200 Gs / Oe. As will be appreciated, this configuration leverages the high magnetic permeability of the magnetic yoke 21, the central magnetic plate 222, and the side magnetic plates 232 to effectively ensure that the magnetic circuit system 2 meets the magnetic field strength requirements after thinning, thereby achieving a thinner design for the sound unit 100.

[0090] In one embodiment, the saturation magnetic induction intensity B of the cobalt alloy material in any one of the magnetic yoke 21, the central magnetic plate 222 and the side magnetic plate 232 is not less than 2.25T. It can be understood that such a setting can utilize the cobalt alloy material in the magnetic yoke 21, the central magnetic plate 222 and the side magnetic plate 232 to have a higher saturation magnetic induction intensity, effectively ensuring that the magnetic circuit system 2 can meet the magnetic field strength requirements after thinning, so as to achieve a thin design of the sound unit 100.

[0091] In one embodiment, at least a portion of the housing 1 is composed of a cobalt alloy material.

[0092] In this embodiment, the cobalt alloy material is a highly magnetically permeable material with a relatively strong saturation magnetic induction intensity. Under a certain size, the greater the saturation magnetic induction intensity of the magnetically permeable material, the greater the BL value and the better the performance.

[0093] Optionally, the shell 1 may be made entirely of cobalt alloy material; or, the shell 1 may be integrally injection-molded by cobalt alloy material and plastic parts; or, the shell 1 may be integrally formed by cobalt alloy material and other metal materials, etc., which is not limited here.

[0094] It can be understood that by setting at least a portion of the shell 1 to be composed of cobalt alloy material, the magnetic circuit system 2 is arranged in the shell 1, so that the central magnetic part 22 and the side magnetic part 23 of the magnetic circuit system 2 are respectively arranged on the magnetic yoke 21, and the side magnetic part 23 is arranged on the outside of the central magnetic part 22, and is connected to the shell 1 by using the side magnetic part 23, so that the shell 1 made of cobalt alloy material is connected to the side magnetic part 23, so that the high saturation magnetic induction intensity of the shell 1 is utilized to cooperate with the magnetic circuit system 2 in the sound unit 100 to effectively meet the magnetic field strength requirements of the magnetic circuit system 2, so that the sound unit 100 can effectively improve the magnetic induction intensity of the magnetic circuit system 2 when the size is certain, thereby improving the BL value and improving the acoustic performance and sound effect of the sound unit 100.

[0095] In this embodiment, by making at least part of the structure of the shell 1 of a cobalt alloy material with high magnetic permeability, the magnetic circuit system 2 in the sound unit 100 can meet the magnetic field strength requirements after being thinned.

[0096] In one embodiment, the material grade of the cobalt alloy material in the housing 1 is Co50 or Co27.

[0097] It should be noted that Co50 is a commonly used soft magnetic alloy material that has the ability to quickly flip the direction of its own magnetic vector in a magnetic field. Co50 has the characteristics of high magnetic permeability, low iron loss, and good thermal stability. Magnetic permeability is one of the important performance indicators of soft magnetic alloys, which refers to the magnetic conductivity of the material under the action of a magnetic field. The higher the magnetic permeability, the stronger the material's response to the magnetic field. Co27 is a soft magnetic alloy with high saturation and high Curie temperature. Co27 has good mechanical toughness, good ductility and high saturation magnetic induction intensity. Compared with Co50 alloy, Co27 alloy has better permeability and does not show the brittleness of Co50 alloy.

[0098] It can be understood that by making at least part of the structure of the shell 1 composed of a cobalt alloy material of Co50 or Co27, the shell 1 has a higher magnetic permeability, and the edge magnetic portion 23 of the magnetic circuit system 2 is connected to the shell 1 made of a cobalt alloy material, so that the high saturation magnetic induction intensity of the shell 1 is utilized to cooperate with the magnetic circuit system 2 to effectively meet the magnetic field strength requirements of the magnetic circuit system 2, so that the sound unit 100 can meet the magnetic field strength requirements when the size is certain, that is, the magnetic circuit system 2 in the sound unit 100 can meet the magnetic field strength requirements after thinning, effectively improving the magnetic induction intensity of the magnetic circuit system 2, thereby improving the BL value, and improving the acoustic performance and sound effect of the sound unit 100.

[0099] In this embodiment, the magnetic permeability of the cobalt alloy material of the housing 1 is no less than 5200 Gs / Oe. Optionally, the magnetic permeability of the cobalt alloy material in any of the housing 1, the magnetic yoke 21, the central magnetic plate 222, and the side magnetic plates 232 is no less than 5200 Gs / Oe. As will be appreciated, this configuration can leverage the high magnetic permeability of the housing 1, the central magnetic plate 222, and the side magnetic plates 232, effectively ensuring that the magnetic circuit system 2, after being thinned, can meet the magnetic field strength requirements, thereby achieving a thinner design for the sound unit 100.

[0100] In one embodiment, the saturation magnetic induction intensity B of the cobalt alloy material of the shell 1 is not less than 2.25T. It can be understood that such a setting can utilize the cobalt alloy material in the shell 1 to have a higher saturation magnetic induction intensity, effectively ensuring that the magnetic circuit system 2 can meet the magnetic field strength requirements after thinning, so as to achieve a thin design of the sound unit 100.

[0101] In one embodiment, the shell 1 includes a first side portion 11 and a second side portion 12 connected end to end, the first side portion 11 is formed as a cobalt alloy material, the second side portion 12 is formed as a plastic material, and the second side portion 12 is provided with a sound hole 14 connected to the internal sound cavity of the shell 1. The shell 1 also includes a mesh component covering the sound hole 14, and the mesh component is adhesively connected to the second side portion 12 or integrally injection molded.

[0102] In this embodiment, as shown in Figures 1, 2, 4, and 5, the housing 1 can optionally be configured as a square frame. The housing 1 includes two first sides 11 and two second sides 12, with the first sides 11 and second sides 12 alternating and connected end to end to form a frame structure. Optionally, the first sides 11 are formed from a cobalt alloy material, that is, the first sides 11 are composed of a cobalt alloy material, and the second sides 12 are formed from a plastic material. Optionally, the cobalt alloy in the first sides 11 is Co50 or Co27.

[0103] As will be appreciated, the first side 11 and second side 12 of the housing 1 are integrally injection-molded. The first side 11 of the housing 1 is made of a cobalt alloy material, which is a highly magnetically permeable material with a strong saturation magnetic flux density. Given a given size, a higher saturation magnetic flux density of a magnetically permeable material results in a higher BL value and better performance.

[0104] In this embodiment, as shown in Figures 1 and 5, by configuring the second side portion 12 to be a plastic material, it is convenient to open a sound hole 14 in the second side portion 12 that communicates with the internal sound cavity of the housing 1, and to provide a mesh component covering the sound hole 14, so that the mesh component and the second side portion 12 are bonded together or integrally injection molded, which makes assembly more convenient. This configuration allows sound to be emitted outward through the sound hole 14, and at the same time, when the sound-emitting unit 100 is installed in a module housing, a device housing, or a metal box, the mesh component effectively prevents sound-absorbing particles filled in the rear sound cavity from entering the interior of the sound-emitting unit 100. Optionally, the mesh component can be a mesh, a metal isolation breathable membrane, or other structures, which are not limited here.

[0105] In one embodiment, the side magnetic conductive plate 232 includes a first side magnetic conductive plate 2321 located at the first side portion 11 and a second side magnetic conductive plate 2322 located at the second side portion 12 . The first side magnetic conductive plate 2321 and the first side portion 11 are formed as an integrally formed part.

[0106] In this embodiment, as shown in Figures 1, 2, 4 and 5, the side magnetic conductive plate 232 of the side magnetic portion 23 includes a first side magnetic conductive plate 2321 and a second side magnetic conductive plate 2322. The first side magnetic conductive plate 2321 is connected to the first side portion 11, and the second side magnetic conductive plate 2322 is connected to the second side portion 12.

[0107] Optionally, the first side magnetic conductive plate 2321 and the first side portion 11 are formed as an integral piece. This simplifies the structural arrangement of the housing 1 and the first side magnetic conductive plate 2321 and improves connection stability. Of course, in other embodiments, the first side magnetic conductive plate 2321 and the first side portion 11 may also be connected by welding or bonding, which is not limited here.

[0108] In this embodiment, the first side magnetic conductive plate 2321 and the first side portion 11 are composed of a cobalt alloy material. This integral molding of the first side magnetic conductive plate 2321 and the first side portion 11 simplifies manufacturing. It will be appreciated that the second side magnetic conductive plate 2322 is composed of a cobalt alloy material, and the second side portion 12 is formed of a plastic material. The second side magnetic conductive plate 2322 and the second side portion 12 can be integrally injection molded. Of course, in other embodiments, adhesive bonding can also be used for the connection, which is not limited here.

[0109] In one embodiment, the housing 1 includes a first side portion 11, a second side portion 12 and a connecting portion 13. The intersection of the first side portion 11 and the second side portion 12 forms a corner. The connecting portion 13 is located at the corner and is respectively connected to the first side portion 11 and the second side portion 12. The connecting portion 13 is formed as a plastic material piece, and the first side portion 11 and the second side portion 12 are formed as cobalt alloy material pieces.

[0110] In this embodiment, as shown in FIG6 , the housing 1 can optionally be configured as a square frame. The housing 1 includes two first sides 11 and two second sides 12, which are alternately arranged. The first sides 11 and the second sides 12 are connected by a connecting portion 13 at the corner where the first sides 11 and the second sides 12 intersect. Optionally, the connecting portion 13 is formed of a plastic material, and the first sides 11 and the second sides 12 are formed of a cobalt alloy material. That is, the first sides 11 and the second sides 12 are composed of a cobalt alloy material. Optionally, the material grade of the cobalt alloy in the first sides 11 and the second sides 12 is Co50 or Co27.

[0111] It is understandable that the first side 11 and the second side 12 of the housing 1 are integrally injection molded through the connecting portion 13. The first side 11 and the second side 12 of the housing 1 are made of a cobalt alloy material. The cobalt alloy material is a highly magnetically conductive material with a high saturation magnetic flux density. When the size is constant, the greater the saturation magnetic flux density of the magnetic conductive material, the greater the BL value and the better the performance. Moreover, since the housing 1 is roughly formed into a square structure, by providing a connecting portion 13 made of a plastic material at its corner, the connecting portion 13 serves to connect the first side 11 and the second side 12 composed of the cobalt alloy material, thereby reducing the difficulty of processing the housing 1, and increasing the content of the cobalt alloy material in the housing 1, thereby improving the magnetic field strength of the magnetic circuit system 2.

[0112] In one embodiment, the side magnetic conductive plate 232 includes a first side magnetic conductive plate 2321 located at the first side portion 11 and a second side magnetic conductive plate 2322 located at the second side portion 12. The first side magnetic conductive plate 2321 and the first side portion 11 are formed as an integral molded part, and the second side magnetic conductive plate 2322 and the second side portion 12 are formed as an integral molded part.

[0113] In this embodiment, as shown in Figures 1, 2, and 6, the side magnetic conductive plates 232 of the side magnetic portion 23 include a first side magnetic conductive plate 2321 and a second side magnetic conductive plate 2322. The first side magnetic conductive plate 2321 is connected to the first side portion 11, and the second side magnetic conductive plate 2322 is connected to the second side portion 12. The first side magnetic conductive plate 2321 and the first side portion 11 are formed as an integrally molded component, while the second side magnetic conductive plate 2322 and the second side portion 12 are formed as an integrally molded component. This simplifies the structural arrangement of the housing 1 and the first and second side magnetic conductive plates 2321 and 2322, and also helps improve connection stability. Of course, in other embodiments, the first side magnetic conductive plate 2321 and the first side portion 11 can also be connected by welding or bonding, and the second side magnetic conductive plate 2322 and the second side portion 12 can also be connected by welding or bonding, without limitation herein.

[0114] In this embodiment, the first side magnetic conductive plate 2321, the second side magnetic conductive plate 2322, the first side portion 11 and the second side portion 12 are composed of cobalt alloy material. In this way, the first side magnetic conductive plate 2321 and the first side portion 11 are set as an integrally formed part, and the second side magnetic conductive plate 2322 and the second side portion 12 are set as an integrally formed part, which can simplify the assembly process and improve assembly efficiency.

[0115] In one embodiment, the thickness of the side magnetic plate 232 is no greater than 0.23 mm. It will be appreciated that the thickness of the side magnetic plate 232 refers to the thickness of the side magnetic plate 232 along the vibration direction of the diaphragm 311 of the sound-emitting unit 100, that is, the thickness in a direction perpendicular to the plane of the side magnetic plate 232. In this embodiment, the side magnetic plate 232 can have a regular plate-like structure (i.e., the thickness of the side magnetic plate 232 is uniform at all locations) or an irregular plate-like structure (i.e., the thickness of the side magnetic plate 232 is not uniform at all locations).

[0116] Optionally, the maximum thickness of the side magnetic plate 232 is no greater than 0.23 mm. It is understood that since the side magnetic plate 232 is made of a cobalt alloy material, it can effectively improve the magnetic induction intensity of the magnetic circuit system 2. When the thickness of the side magnetic plate 232 is less than or equal to 0.23 mm, it can meet the magnetic field intensity requirements of the magnetic circuit system 2, effectively achieving a thin design of the sound unit 100.

[0117] In one embodiment, the thickness of the central magnetic plate 222 is no greater than 0.23 mm. It will be appreciated that the thickness of the central magnetic plate 222 is the thickness of the central magnetic plate 222 along the vibration direction of the diaphragm 311 of the sound-emitting unit 100, that is, the thickness in a direction perpendicular to the plane of the central magnetic plate 222. In this embodiment, the central magnetic plate 222 can have a regular plate-like structure (i.e., the thickness of the central magnetic plate 222 is uniform at all locations) or an irregular plate-like structure (i.e., the thickness of the central magnetic plate 222 is not uniform at all locations).

[0118] Optionally, the maximum thickness of the central magnetic plate 222 is no greater than 0.23 mm. It is understood that since the central magnetic plate 222 is made of a cobalt alloy material, the magnetic induction intensity of the magnetic circuit system 2 can be effectively improved. When the thickness of the central magnetic plate 222 is less than or equal to 0.23 mm, the magnetic field intensity requirement of the magnetic circuit system 2 can be met, effectively achieving a thin design of the sound unit 100.

[0119] In one embodiment, the thickness of the magnetic yoke 21 is no greater than 0.23 mm. It will be appreciated that the thickness of the magnetic yoke 21 refers to the thickness of the magnetic yoke 21 along the vibration direction of the diaphragm 311 of the sound unit 100, that is, the thickness along a direction perpendicular to the plane of the magnetic yoke 21. In this embodiment, the magnetic yoke 21 can be a regular plate-like structure (i.e., the thickness of the magnetic yoke 21 is uniform at all locations) or an irregular plate-like structure (i.e., the thickness of the magnetic yoke 21 is not uniform at all locations).

[0120] Optionally, the maximum thickness of the magnetic yoke 21 is no greater than 0.23 mm. It is understood that since the magnetic yoke 21 is made of a cobalt alloy material, the magnetic induction intensity of the magnetic circuit system 2 can be effectively improved. When the thickness of the magnetic yoke 21 is less than or equal to 0.23 mm, the magnetic field intensity requirement of the magnetic circuit system 2 can be met, effectively achieving a thin design of the sound unit 100.

[0121] In this embodiment, optionally, the maximum thickness of the side magnetic conductive plates 232 is not greater than 0.23 mm, the maximum thickness of the central magnetic conductive plate 222 is not greater than 0.23 mm, and the maximum thickness of the magnetic conductive yoke 21 is not greater than 0.23 mm, which is not limited here.

[0122] In one embodiment, the height of the sound unit 100 is no greater than 1.8 mm.

[0123] It can be understood that by setting the height of the sound unit 100 to no more than 1.8 mm, a thin design of the sound unit 100 is effectively achieved. In this embodiment, the height of the sound unit 100 is the height along the vibration direction of the diaphragm 311 or the height in a direction perpendicular to the top surface of the vibration plate 312. For example, the sound unit 100 includes a vibration system 3 and a magnetic circuit system 2. The upper surface of the diaphragm assembly 31 of the vibration system 3 is the upper surface of the sound unit 100, and the bottom surface of the magnetic yoke 21 of the magnetic circuit system 2 is the lower surface of the sound unit 100. Then, the height of the sound unit 100 is the distance between the upper surface of the diaphragm assembly 31 and the bottom surface of the magnetic yoke 21.

[0124] The present invention further provides an electronic device comprising the aforementioned sound unit 100. The specific structure of the sound unit 100 is similar to that of the aforementioned embodiments. Since this electronic device utilizes all the technical solutions of all the aforementioned embodiments, it at least has all the beneficial effects brought about by the technical solutions of the aforementioned embodiments, and no further details will be given here.

[0125] In this embodiment, the electronic device further includes a device housing, and the sound unit 100 is disposed in the device housing, which is not limited here. It is understandable that the electronic device can be a mobile phone, a speaker, a computer, a headset, a watch, or a television, which is not limited here.

[0126] The above descriptions are merely optional embodiments of the present invention and do not limit the patent scope of the present invention. All equivalent structural transformations made based on the contents of the present invention's description and drawings, or direct / indirect applications in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A sound-emitting unit, characterized in that: The sound-emitting monomer comprises: Housing; and A magnetic circuit system, wherein the magnetic circuit system is arranged in the outer shell, the magnetic circuit system includes a magnetic yoke, a central magnetic part and a side magnetic part, the central magnetic part and the side magnetic part are respectively arranged on the magnetic yoke, and the side magnetic part is arranged on the outside of the central magnetic part, the central magnetic part includes a central magnetic steel and a central magnetic plate, the opposite sides of the central magnetic steel are respectively connected to the central magnetic plate and the magnetic yoke, the side magnetic part includes a side magnetic steel and a side magnetic plate, the opposite sides of the side magnetic steel are respectively connected to the side magnetic plate and the magnetic yoke, the central magnetic plate and / or the side magnetic plate are composed of a cobalt alloy material, and the magnetic yoke is composed of the cobalt alloy material.

2. The sound-emitting unit according to claim 1, characterized in that: The material grade of the cobalt alloy material in the central magnetic conductive plate is Co50 or Co27; And / or, the material grade of the cobalt alloy material in the edge magnetic conductive plate is Co50 or Co27.

3. The sound-emitting unit according to claim 1, characterized in that: The material grade of the cobalt alloy in the magnetic yoke is Co50 or Co27.

4. The sound-emitting unit according to claim 1, characterized in that: The sound unit also includes a vibration system, which includes a diaphragm. The diaphragm includes a folding ring portion and an inner fixing portion and an outer fixing portion arranged on the inner and outer sides of the folding ring portion, the outer fixing portion is connected to the outer shell, the folding ring portion is recessed in the direction close to the edge magnetic conductive plate, and the edge magnetic conductive plate is provided with a first avoidance groove opposite to the folding ring portion and extending in the direction away from the diaphragm, and the depth of the first avoidance groove is not greater than 0.1 mm.

5. The sound-emitting unit according to claim 1, characterized in that: The side magnetic portion and the center magnetic portion are spaced apart to form a magnetic gap, the sound-emitting unit also includes a vibration system, the vibration system includes a diaphragm assembly, a voice coil and a centering assembly, the outer periphery of the diaphragm assembly is fixed to the outer shell, the first end of the voice coil is connected to the diaphragm assembly, the second end of the voice coil is inserted in the magnetic gap, the two ends of the centering assembly are respectively connected to the second end of the voice coil and the outer shell, the magnetic yoke is provided with a second avoidance groove opposite to the centering assembly, the second avoidance groove extends in a direction away from the centering assembly, and the depth of the second avoidance groove is between 0.05mm and 0.15mm.

6. The sound-emitting unit according to claim 5, characterized in that: The diaphragm assembly includes a diaphragm and a vibration plate, the outer periphery of the diaphragm is connected to the outer shell, the vibration plate is connected to the diaphragm and to the first end of the voice coil, the vibration plate includes a main body and a pressure edge portion provided on the outer periphery of the main body, the pressure edge portion is bent relative to the main body toward the direction close to the magnetic circuit system, an internal fixing portion is provided on the inner side of the diaphragm, the internal fixing portion is connected to the pressure edge portion, and the top surfaces of the internal fixing portion and the main body are located in the same plane.

7. The sound-emitting unit according to claim 1, characterized in that: The magnetic permeability of the cobalt alloy material in any one of the magnetic yoke, the central magnetic plate and the side magnetic plate is not less than 5200 Gs / Oe; And / or, the saturation magnetic induction intensity B of the cobalt alloy material in any one of the magnetic yoke, the central magnetic plate and the side magnetic plate is not less than 2.25T.

8. The sound-emitting unit according to any one of claims 1 to 7, characterized in that: At least a part of the shell is made of a cobalt alloy material, and the material grade of the cobalt alloy material in the shell is Co50 or Co27.

9. The sound-emitting unit according to claim 8, characterized in that: The shell includes a first side portion and a second side portion connected end to end, the first side portion is formed of a cobalt alloy material, the second side portion is formed of a plastic material, the second side portion is provided with a sound hole connected to the internal sound cavity of the shell, the shell also includes a mesh assembly covering the sound hole, the mesh assembly is bonded to the second side portion or integrally injection molded.

10. The sound-emitting unit according to claim 9, characterized in that: The side magnetic conductive plate includes a first side magnetic conductive plate located at the first side portion and a second side magnetic conductive plate located at the second side portion, and the first side magnetic conductive plate and the first side portion are formed as an integrally formed part.

11. The sound-emitting unit according to claim 8, characterized in that: The shell includes a first side portion, a second side portion and a connecting portion, wherein the intersection of the first side portion and the second side portion forms a corner portion, the connecting portion is located at the corner portion and is respectively connected to the first side portion and the second side portion, the connecting portion is formed as a plastic material piece, and the first side portion and the second side portion are formed as a cobalt alloy material piece.

12. The sound-emitting unit according to claim 11, characterized in that: The side magnetic conductive plate includes a first side magnetic conductive plate located at the first side portion and a second side magnetic conductive plate located at the second side portion. The first side magnetic conductive plate and the first side portion are formed as an integral part, and the second side magnetic conductive plate and the second side portion are formed as an integral part.

13. The sound-emitting unit according to any one of claims 1 to 7, characterized in that: The thickness of the side magnetic conductive plate is not more than 0.23 mm; And / or, the thickness of the central magnetic conductive plate is not greater than 0.23 mm; And / or, the thickness of the magnetic yoke is not greater than 0.23 mm.

14. The sound-emitting unit according to any one of claims 1 to 7 and 9 to 12, characterized in that: The height of the sound-emitting unit is no more than 1.8 mm.

15. An electronic device, characterized in that: It comprises the sound-emitting unit as claimed in any one of claims 1 to 14.

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