Micro-speaker

Abstract

The application discloses a micro loudspeaker, which comprises a shell, a motor assembly and a loudspeaker assembly in the shell, and the loudspeaker assembly comprises a frame assembly and a diaphragm unit connected in the frame assembly. The motor assembly comprises a magnetic circuit unit fixed on the bottom of the frame assembly and two vibration units on the lateral sides of the magnetic circuit unit, the magnetic circuit unit is below the diaphragm unit, and the diaphragm unit vertically vibrates under the drive of the magnetic circuit unit. The magnetic circuit unit is provided with a yoke fixed on the bottom of the frame assembly, an intermediate magnetic steel fixed on the yoke and two short-side magnetic steels on the lateral sides of the intermediate magnetic steel, the short-side magnetic steels are correspondingly arranged in the lateral direction with the vibration units, and the loudspeaker assembly laterally vibrates under the action of the short-side magnetic steels and the vibration units. The motor assembly and the loudspeaker assembly share one magnetic circuit unit, and the loudspeaker assembly serves as a vibration mass block of the motor assembly, the overall mass of the vibration unit is increased, and the overall performance of the micro loudspeaker is improved.

Description

Technical Field

[0001] This invention relates to the field of vibration motor technology, and more particularly to a miniature loudspeaker. Background Technology

[0002] With the miniaturization of electronic products and the improvement of manufacturing processes, product components are becoming more integrated and thinner. For portable devices such as mobile phones, sound and vibration are essential functions. Previously, these functions were achieved through separate speaker modules and motors, which occupied a significant amount of space. Although speaker modules and motors have different functions, they share many similarities in their operating principles, including the interaction between permanent magnets and conductor coils.

[0003] Please refer to Chinese invention patent application CN120786249A, which discloses a multifunctional sound-generating device that integrates a speaker module and a vibration motor into one unit. In this device, a short-axis side magnet serves as the motor magnet, with the magnetization direction being the Z-axis. The motor coil is located at the bottom, has no magnetic core, and uses a changing current to generate Lorentz force in a magnetic field to drive the speaker vibration. The vibrating arm beam is fixed to the speaker unit via laser welding. The signal from the speaker unit is led out of the housing through an FPC (Flexible Printed Circuit), and the FPC also participates in the motor's vibration when it operates. Furthermore, the speaker unit and the housing are sealed with a relatively thick sealing ring.

[0004] However, this multi-functional sound-generating device has the following drawbacks: 1. The short-axis magnet is limited by height and space, resulting in a limited magnetization direction and low magnetic energy; 2. The voice coil is located at the bottom, which is limited by the position and size of the short-axis magnet, the height and space at the bottom, and the small number of coil turns. Furthermore, the use of Lorentz magnetism results in low magnetic energy utilization and significant hysteresis feedback during movement. Additionally, placing the voice coil at the bottom increases product height, which is detrimental to the trend towards thinner products; 3. The vibration arm beam is welded to the unit, and the height of the unit in the Z-direction during assembly is limited by process control. The weld strength and welding position accuracy restrict product reliability and assembly yield; 4. Since the FPC and the vibration arm beam are in the same space... The FPC, which extends in the X direction, also participates in the motor vibration. Since it is encapsulated internally, prolonged use may lead to mutual interference between the flexible FPC and the vibrating arm beam. Furthermore, the FPC may break, potentially causing speaker failure. Fifth, the wider and thicker sealing ring restricts the motor's X-axis vibration, hindering its movement and severely weakening its vibration response. Additionally, the thicker sealing ring supports a larger front cavity space, which can easily result in a large front cavity during speaker assembly, especially in side-exit structures, leading to poor high-frequency acoustics and affecting high-frequency performance. Simultaneously, the thicker sealing ring occupies the Z-axis dimension, which is also detrimental to the trend towards thinner products.

[0005] Therefore, it is hoped that a new miniature loudspeaker can be proposed to overcome the above-mentioned defects. Summary of the Invention

[0006] The purpose of this invention is to provide a miniature speaker that, through integrated design, can reduce space occupation and lower product costs to a certain extent.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a miniature loudspeaker, comprising a housing and a motor assembly and a loudspeaker assembly located within the housing. The housing has a receiving space extending through the top. The loudspeaker assembly includes a frame assembly housed within the receiving space and a diaphragm unit connected within the frame assembly. The motor assembly includes a magnetic circuit unit fixed to the bottom of the frame assembly and two vibration units located on both lateral sides of the magnetic circuit unit. The magnetic circuit unit is located below the diaphragm unit, and the diaphragm unit vibrates vertically under the drive of the magnetic circuit unit. The magnetic circuit unit has a yoke fixed to the bottom of the frame assembly, a central magnet fixed to the yoke, and two short-side magnets located on both lateral sides of the central magnet. The short-side magnets and the vibration units are arranged correspondingly in the lateral direction, and the loudspeaker assembly vibrates laterally under the action of the short-side magnets and the vibration units.

[0008] In a preferred embodiment, the housing has an outer shell assembly and a rear cover plate fixed to the bottom of the outer shell assembly. The rear cover plate has a main body portion extending laterally and a vertical portion extending upward from both sides of the main body portion. The vibration unit has a magnetic core fixed to the inner side of the vertical portion and a drive coil wound on the magnetic core. The magnetic core is located on the outer side of the short-side magnet.

[0009] In a preferred embodiment, the yoke has a main body fixed to the bottom of the basin assembly and flanges bent upward from both sides of the main body. The magnetic circuit unit has an intermediate washer that fits against the top surface of the intermediate magnet. The intermediate magnet is fixed to the main body, and the short side magnet is fixed to the outer side of the flange. A magnetic gap is formed between the intermediate magnet, the intermediate washer, and the short side magnet.

[0010] In a preferred embodiment, the basin frame assembly has a rectangular basin frame and two vibrating cantilever arms located at the lateral ends of the basin frame. The vibrating cantilever arms extend obliquely in the longitudinal direction and have a fixed end injection-molded in the basin frame and a cantilever end away from the basin frame. The cantilever end is located on the longitudinal outer side of the basin frame.

[0011] In a preferred embodiment, the diaphragm unit is provided with a voice coil housed in a frame and a plurality of loudspeaker FPCs located at the bottom of the voice coil. At least a portion of the voice coil is inserted into the magnetic gap of the magnetic circuit unit. One end of each loudspeaker FPC is connected to the bottom of the voice coil and the other end is connected to the fixed end of the vibrating cantilever.

[0012] In a preferred embodiment, the speaker FPC has an inner pad soldered to the bottom of the voice coil and an outer pad soldered to the bottom edge of the fixed end. The voice coil is connected to the speaker FPC to receive an input electrical signal so as to vibrate vertically relative to the frame.

[0013] In a preferred embodiment, the housing assembly has a housing portion and a metal skeleton integrally formed within the housing portion. The housing portion has a rectangular frame and extension portions extending outward from both lateral sides of the rectangular frame. The metal skeleton is exposed on the inner surface of the rectangular frame and has welding feet extending laterally outward from the rectangular frame. The welding feet are exposed on the extension portions on one lateral side of the rectangular frame.

[0014] In a preferred embodiment, the diaphragm unit has a diaphragm fold ring located above the voice coil. The diaphragm fold ring has an inner ring, an outer ring located around the outer periphery of the inner ring, and several elastic portions connecting the inner ring and the outer ring. The inner ring is fixed to the top of the voice coil, and the outer ring is fixed to the top of the frame.

[0015] In a preferred embodiment, the diaphragm unit further includes a diaphragm dome and a front cover located above the diaphragm fold ring, the diaphragm dome being connected to the top surface of the inner ring, and the front cover being connected to the top surface of the outer ring.

[0016] In a preferred embodiment, the miniature speaker includes a sealing film located above the housing assembly, the inner edge of the sealing film being connected to the top of the front cover and the outer edge being connected to the top of the housing assembly.

[0017] Compared with the prior art, the present invention has the following beneficial effects: the motor assembly and the speaker assembly in the miniature speaker share a magnetic circuit unit, which saves costs; wherein, the speaker assembly can serve as part of the vibration unit (i.e., the vibrating mass block) of the motor assembly, increasing the overall mass of the vibration unit of the motor assembly, and thus improving the overall performance of the miniature speaker.

[0018] Furthermore, the motor assembly uses short-side magnets as the motor's magnets, with the magnetization direction being transverse, and the magnetization directions of the two short-side magnets being opposite. This maximizes the volume of the short-side magnets, thereby obtaining higher magnetic energy. Additionally, the drive coil is wound on a magnetic core, allowing for more space to be provided for the number of turns, thus improving space utilization.

[0019] Furthermore, the vibrating cantilever is injection molded into the frame, reducing one laser welding step and thus lowering the manufacturing process and complexity; it also allows for more precise positioning of the diaphragm unit and the vibrating cantilever. Simultaneously, the housing assembly is supported by a metal frame through injection molding, providing the necessary welding strength for the vibrating cantilever, while the injection-molded housing also meets the dual requirements of conductivity and insulation.

[0020] Furthermore, the sealing film significantly reduces the negative impact of the sealing ring on the lateral vibration of the motor assembly and improves the ability to eliminate the potential for seal failure caused by interaction forces. Simultaneously, due to the height advantage of the sealing film, it occupies less vertical space, thereby reducing the use of upper space and providing better mid-to-high frequency acoustic performance for subsequent assembly. Attached Figure Description

[0021] Figure 1 This is an exploded view of a miniature loudspeaker in a preferred embodiment of the present invention.

[0022] Figure 2 yes Figure 1 A three-dimensional schematic diagram of the housing assembly in the miniature speaker is shown.

[0023] Figure 3 yes Figure 2 An exploded view of the housing assembly is shown.

[0024] Figure 4 yes Figure 1 The diagram shows a partial exploded view of the speaker assembly in the miniature speaker.

[0025] Figure 5 yes Figure 1 A three-dimensional schematic diagram of the motor assembly in the miniature speaker shown.

[0026] Figure 6 yes Figure 1 The cross-sectional view of the miniature loudspeaker shown. Detailed Implementation

[0027] Embodiments of the present invention are described in detail below. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the embodiments of the present invention, and should not be construed as limiting the present invention.

[0028] In the description of the embodiments of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0029] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of the present invention, "a number" means two or more, unless otherwise explicitly specified.

[0030] In the embodiments of the present invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention according to the specific circumstances.

[0031] Please see Figures 1 to 6 As shown, a preferred embodiment of the present invention discloses a miniature speaker that can be applied to electronic devices such as mobile phones, tablets, smartwatches, and game controllers. The miniature speaker includes a housing 10 and a motor assembly 20 and a speaker assembly 30 located within the housing 10. The housing 10 has a receiving space 101 extending through the top, and both the motor assembly 20 and the speaker assembly 30 are received within the receiving space 101.

[0032] The loudspeaker assembly 30 includes a frame assembly 31 housed within a receiving space 101 and a diaphragm unit connected within the frame assembly 31. The motor assembly 20 includes a magnetic circuit unit 21 fixed to the bottom of the frame assembly 31 and two vibration units 22 located on either side of the magnetic circuit unit 21. The magnetic circuit unit 21 is fixed to the bottom of the frame assembly 31 and is located below the diaphragm unit, so that the diaphragm unit vibrates vertically under the drive of the magnetic circuit unit 21. Furthermore, the frame assembly 31 is elastically connected to the housing 10, so that the loudspeaker assembly 30 vibrates laterally under the action of the magnetic circuit unit 21 and the vibration units 22.

[0033] Please see Figures 1 to 3 As shown, the housing 10 includes an outer shell assembly 11 and a rear cover plate 12 fixed to the bottom of the outer shell assembly 11. The outer shell assembly 11 includes a housing portion 111 and a metal frame 112 integrally formed within the housing portion 111. The housing portion 111 is injection molded and includes a rectangular frame 1111 and two extension portions 1112 extending outward from the lateral sides of the rectangular frame 1111. The metal frame 112 is exposed on the inner surface of the rectangular frame 1111 and has welding feet 1121 extending laterally from the rectangular frame 1111. The welding feet 1121 are exposed on the extension portion 1112 on one lateral side of the rectangular frame 1111. The rear cover plate 12 includes a main plate portion 121 extending laterally and vertical portions 122 extending upward from the lateral sides of the main plate portion 121. The main plate portion 121 is fixed to the bottom of the housing portion 111 of the outer shell assembly 11, together forming the aforementioned receiving space 101.

[0034] Please see Figure 5 As shown, the magnetic circuit unit 21 includes a yoke 211 fixed to the bottom of the frame assembly 31, a central magnet 212 fixed to the yoke 211, two short-side magnets 213 located on both sides of the central magnet 212 laterally, two long-side magnets 214 located on both sides of the central magnet 212 longitudinally, a washer corresponding to each of the short-side magnets 213 and the long-side magnets 214, and a central washer 215 attached to the top surface of the central magnet 212. The short-side magnets 213 and the vibration unit 22 are arranged laterally, and the speaker assembly 30 vibrates laterally under the action of the short-side magnets 213 and the vibration unit 22. In summary, the motor assembly 20 and the speaker assembly 30 in the miniature speaker share a single magnetic circuit unit 21, thereby saving costs.

[0035] The yoke 211 is U-shaped and has a main body 2111 fixed to the bottom of the basin frame assembly 31 and flanged portions 2112 that bend upward from the lateral sides of the main body 2111. The middle magnet 212 and two long side magnets 214 are fixed to the main body 2111. The short side magnet 213 is fixed to the lateral outside of the flanged portion 2112. Magnetic gaps are formed between the middle magnet 212 and the middle washer 215 and between the short side magnet 213 and the long side magnet 214.

[0036] In this embodiment, the motor assembly 20 uses short-side magnets 213 as the motor magnets, with the magnetization direction being transverse. The magnetization directions of the two short-side magnets 213 are opposite, which maximizes the volume of the short-side magnets 213, thereby obtaining higher magnetic energy. Simultaneously, the intermediate magnet 212 and the two long-side magnets 214, through a U-shaped yoke 211, can be superimposed to provide the short-side magnets 213 with the magnetic energy required for the vibration of the motor assembly 20, providing sufficient power for driving the motor assembly 20. Furthermore, the speaker assembly 30 can serve as a partial vibration unit (i.e., a vibrating mass block) of the motor assembly 20, thereby increasing the overall mass of the vibration unit 22 of the motor assembly 20 and thus improving the overall performance of the motor assembly 20.

[0037] The vibration unit 22 includes a magnetic core 221 fixed to the inner lateral side of the vertical part 122 of the rear cover plate 12, a drive coil 222 wound on the magnetic core 221, and a motor FPC 223 located on the main board part 121 of the rear cover plate 12. The magnetic core 221 is preferably fixed to the vertical part 122 by a laser welding machine, which can more firmly withstand the impact of mechanical collisions, thereby improving reliability. Meanwhile, the short-side magnet 213 is positioned laterally opposite the magnetic core 221, maximizing the use of magnetic pole attraction and repulsion. Furthermore, the magnetic circuit unit 21 also includes a thin anti-collision block 216 attached to the outer lateral side of the short-side magnet 213. The anti-collision block 216 is located between the short-side magnet 213 and the magnetic core 221 to prevent direct collision between the two and facilitate rapid rebound and recovery.

[0038] The drive coil 222 is wound on the magnetic core 221, which allows for more space to be provided for the number of turns, thereby improving space utilization. At the same time, the drive coil 222 uses coil induction to generate magnetism, and through the principle of like poles repelling and unlike poles attracting, it can provide better instantaneous response. The motor FPC 223 has a conductive part (not labeled) electrically connected to the drive coil 222 and a welding part 2231 extending out of the rear cover plate 12. The welding part 2231 is exposed on the extension 1112 on the other side of the rectangular frame 1111. That is, the two motor coils 222 are connected by the motor FPC 223 attached to the rear cover plate 12 and led to the extension 1112 of the housing assembly 11, thus being independent of the welding feet 1121 of the speaker assembly 30.

[0039] In this embodiment, the magnetic core 221 is disposed on the lateral outer side of the short side magnet 213. The driving coil 222 generates an alternating induced magnetic field through a changing current. The magnetic core 221, which is wrapped by the driving coil 222, can enhance the magnetic field strength. Through the fixed magnetic field of the short side magnet 213 corresponding to the two lateral ends, an attraction / repulsion force is generated, which achieves the reciprocating motion of the speaker assembly 20 in the lateral direction, thereby generating a vibration.

[0040] Combination Figure 4 and Figure 6 As shown, the basin frame assembly 31 has a rectangular basin frame 311 and two vibrating cantilever arms 312 located at both lateral ends of the basin frame 311. The yoke 211 of the magnetic circuit unit 21 is fixed to the bottom of the basin frame 311. The vibrating cantilever arms 312 extend obliquely in the longitudinal direction and have a fixed end 3121 injection-molded in the basin frame 311 and a cantilever end 3122 away from the basin frame 311. The cantilever end 3122 is located on the longitudinal outer side of the basin frame 311. In this embodiment, the vibrating cantilever arms 312 are injection-molded in the basin frame 311 and integrated as one piece. This injection molding method can reduce one laser welding, thereby reducing the process steps and difficulty; and more accurately positioning the relative position of the diaphragm unit and the vibrating cantilever arms 312. At the same time, the outer shell assembly 11 is injection-molded and supported by a metal frame 112, which provides the welding strength required for the vibrating cantilever arms 312. At the same time, the injection-molded shell part 111 can meet the dual requirements of conductivity and insulation.

[0041] The diaphragm unit includes a voice coil 32 housed within a frame 311 and several speaker FPCs 33 located at the bottom of the voice coil 32. At least a portion of the voice coil 32 is inserted into the magnetic gap of the magnetic circuit unit 21. One end of each speaker FPC 33 is connected to the bottom of the voice coil 32, and the other end is connected to the fixed end 3121 of the vibrating cantilever 312. Specifically, each speaker FPC 33 has an inner pad 331 soldered to the bottom of the voice coil 32 and an outer pad 332 soldered to the bottom edge of the fixed end 3121. The voice coil 32 is connected to the speaker FPC 33 to receive an input electrical signal, causing it to vibrate vertically relative to the frame 311.

[0042] In this embodiment, the vibrating cantilever 312 can also serve as the electrical signal conduction point for the speaker assembly 30, thus combining vibration and conduction into one, thereby improving product reliability and reducing product component costs. Specifically, the inner pad 331 of the speaker FPC 33 is welded to the voice coil 32, and the outer pad 332 is welded and fixed to the fixed end 3121 of the vibrating cantilever 312. The cantilever end 3122 of the vibrating cantilever 312 is then connected to the metal frame 112 of the housing assembly 11, until it connects to the welding foot 1121 placed on the extension 1112, thereby connecting to external signals.

[0043] The diaphragm unit also includes a diaphragm surround 34 located above the voice coil 32, a diaphragm dome 35 located above the diaphragm surround 34, and a front cover 36. The diaphragm surround 34 has an inner ring, an outer ring located around the outer periphery of the inner ring, and several elastic parts connecting the inner ring and the outer ring. The inner ring and the outer ring can move relative to each other in the vertical direction through the elastic parts. Furthermore, the inner ring is fixed to the top of the voice coil 32, and the outer ring is fixed to the top of the frame 311. The diaphragm dome 35 is located inside the front cover 36 and does not interfere with each other. The diaphragm dome 35 is connected to the top surface of the inner ring, and the front cover 36 is connected to the top surface of the outer ring.

[0044] The miniature speaker also includes a sealing film 40, preferably a rubber or silicone film, located above the housing assembly 11. The inner edge of the sealing film 40 is connected to the top of the front cover 36, and the outer edge is connected to the top of the housing assembly 11. Specifically, the housing assembly 11 has a top cover 113 fixed to the top surface of the rectangular frame 1111 of the housing portion 111, and the outer edge of the sealing film 40 is connected to the top of the top cover 113. Thus, the speaker assembly 30 achieves a sealed connection with the housing assembly 11 through the sealing film 40, effectively isolating the front and rear cavities from air and providing waterproofing.

[0045] Furthermore, the sealing film 40 significantly reduces the negative impact of the sealing ring on the lateral vibration of the motor assembly 20, and improves the ability to eliminate the potential for seal failure caused by interaction forces. Simultaneously, due to the height advantage of the sealing film 40, it occupies less vertical space, thereby reducing the use of upper space and providing better mid-to-high frequency acoustic performance for subsequent assembly.

[0046] In summary, the above are merely preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. Any simple equivalent changes and modifications made in accordance with the claims and description of the present invention should still fall within the scope of the present invention.

Claims

1. A miniature loudspeaker, comprising a housing and a motor assembly and a loudspeaker assembly located within the housing, the housing having a receiving space extending through the top, the loudspeaker assembly comprising a frame assembly received within the receiving space and a diaphragm unit connected within the frame assembly; characterized in that: The motor assembly includes a magnetic circuit unit fixed to the bottom of the frame assembly and two vibration units located on both sides of the magnetic circuit unit. The magnetic circuit unit is located below the diaphragm unit, and the diaphragm unit vibrates vertically under the drive of the magnetic circuit unit. The magnetic circuit unit has a yoke fixed to the bottom of the frame assembly, a middle magnet fixed to the yoke, and two short magnets located on both sides of the middle magnet. The short magnets are arranged in a horizontal direction corresponding to the vibration units, and the speaker assembly vibrates horizontally under the action of the short magnets and the vibration units.

2. The miniature loudspeaker as described in claim 1, characterized in that: The housing has an outer shell assembly and a rear cover plate fixed to the bottom of the outer shell assembly. The rear cover plate has a main body portion extending laterally and a vertical portion extending upward from both sides of the main body portion. The vibration unit has a magnetic core fixed to the inner side of the vertical portion and a drive coil wound on the magnetic core. The magnetic core is located on the outer side of the short side magnet.

3. The miniature loudspeaker as described in claim 2, characterized in that: The yoke has a main body fixed to the bottom of the basin assembly and flanges that bend upward from both sides of the main body. The magnetic circuit unit has a central washer that fits against the top surface of the central magnet. The central magnet is fixed to the main body, and the short side magnet is fixed to the outer side of the flange. A magnetic gap is formed between the central magnet, the central washer, and the short side magnet.

4. The miniature loudspeaker as described in claim 3, characterized in that: The basin frame assembly has a rectangular basin frame and two vibrating cantilever arms located at both lateral ends of the basin frame. The vibrating cantilever arms extend obliquely in the longitudinal direction and have a fixed end injection-molded in the basin frame and a cantilever end away from the basin frame. The cantilever end is located on the longitudinal outer side of the basin frame.

5. The miniature loudspeaker as described in claim 4, characterized in that: The diaphragm unit is provided with a voice coil housed in a frame and several speaker FPCs located at the bottom of the voice coil. At least a portion of the voice coil is inserted into the magnetic gap of the magnetic circuit unit. One end of the speaker FPC is connected to the bottom of the voice coil and the other end is connected to the fixed end of the vibrating cantilever.

6. The miniature loudspeaker as described in claim 5, characterized in that: The speaker FPC has an inner pad soldered to the bottom of the voice coil and an outer pad soldered to the bottom edge of the fixed end. The voice coil is connected to the speaker FPC to receive an input electrical signal so as to vibrate vertically relative to the frame.

7. The miniature loudspeaker as described in claim 5, characterized in that: The housing assembly includes a housing portion and a metal skeleton integrally formed within the housing portion. The housing portion has a rectangular frame and extension portions extending outward from both lateral sides of the rectangular frame. The metal skeleton is exposed on the inner surface of the rectangular frame and has welding feet extending laterally outward from the rectangular frame. The welding feet are exposed on the extension portions on one lateral side of the rectangular frame.

8. The miniature loudspeaker as described in claim 5, characterized in that: The diaphragm unit has a diaphragm ring located above the voice coil. The diaphragm ring has an inner ring, an outer ring located around the outer periphery of the inner ring, and several elastic portions connecting the inner ring and the outer ring. The inner ring is fixed to the top of the voice coil, and the outer ring is fixed to the top of the frame.

9. The miniature loudspeaker as described in claim 8, characterized in that: The diaphragm unit also has a diaphragm dome and a front cover located above the diaphragm fold ring. The diaphragm dome is connected to the top surface of the inner ring, and the front cover is connected to the top surface of the outer ring.

10. The miniature loudspeaker as described in claim 9, characterized in that: The miniature speaker includes a sealing film located above the housing assembly, the inner edge of the sealing film being connected to the top of the front cover and the outer edge being connected to the top of the housing assembly.

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