A micro speaker

Abstract

The utility model discloses a kind of micro loudspeakers, including basin frame, vibration component and magnetic circuit component, vibration component includes diaphragm component, skeleton and voice coil, diaphragm component includes by inside and outside sequentially connected inner fixed part, inner fold ring part, vibration part, outer fold ring part and outer fixed part, outer fixed part connects basin frame, skeleton includes sequentially connected inner mounting portion, frame height part and outer mounting portion, outer mounting portion connects vibration part, inner mounting portion is located above or below voice coil and connects voice coil, inner mounting portion is thinning structure;Magnetic circuit component includes lower yoke, center magnetic structure arranged on lower yoke, side magnetic structure arranged on lower yoke and cover center magnetic structure and the upper yoke of side magnetic interface, center magnetic structure is located between at least one set of two side magnetic structures oppositely arranged, center magnetic structure and side magnetic structure form the magnetic gap for the activity of voice coil between, inner fixed part connects upper yoke.This micro loudspeaker has large amplitude, with high performance advantage.

Description

Technical Field

[0001] This utility model relates to the field of electroacoustic converter technology, and in particular to a miniature loudspeaker. Background Technology

[0002] Miniature speakers are widely used in electronic devices such as smartwatches, mobile phones, and tablets. As these electronic devices become thinner and lighter, the space available for installing miniature speakers is getting smaller and smaller, which forces the overall volume of the magnetic circuit components of the miniature speaker to be reduced. As a result, the amplitude of the miniature speaker is compressed, and the acoustic performance of the miniature speaker deteriorates. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a high-amplitude, high-performance miniature loudspeaker.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: a miniature loudspeaker, including a frame, a vibration assembly, and a magnetic circuit assembly. The vibration assembly includes a diaphragm assembly, a frame, and a voice coil. The diaphragm assembly includes an inner fixing part, an inner folded ring part, a vibrating part, an outer folded ring part, and an outer fixing part connected sequentially from the inside to the outside. The outer fixing part is connected to the frame. The frame includes an inner mounting part, a raised part, and an outer mounting part connected sequentially. The outer mounting part is connected to the vibrating part. The inner mounting part is located above or below the voice coil and connected to the voice coil. The inner mounting part is for reducing... Thin structure; the magnetic circuit assembly includes a lower yoke, a central magnetic structure disposed on the lower yoke, a side magnetic structure disposed on the lower yoke, and an upper yoke covering the central magnetic structure and the side magnetic structure. The central magnetic structure is located between at least one set of two oppositely disposed side magnetic structures, and a magnetic gap is formed between the central magnetic structure and the side magnetic structure for the voice coil to move. The magnetic circuit assembly has an upper magnetic loop and a lower magnetic loop with opposite directions. The upper magnetic loop passes through the upper part of the magnetic gap, and the lower magnetic loop passes through the lower part of the magnetic gap. The inner fixing part is connected to the upper yoke.

[0005] Furthermore, the thinned structure is formed by stamping or milling.

[0006] Furthermore, the cross-section of the elevated section is U-shaped.

[0007] Furthermore, the external mounting part has a rectangular window, the voice coil is set corresponding to the rectangular window, the four corners of the rectangular window are respectively connected to the elevating part, and each elevating part is connected to the internal mounting part.

[0008] Furthermore, the inner mounting portion is located above the voice coil, and the upper yoke has an upper clearance groove for avoiding the inner mounting portion.

[0009] Furthermore, it also includes a centering support plate, which connects the frame and the voice coil. The connection between the centering support plate and the voice coil is located below the voice coil. The lower yoke has a lower clearance groove for avoiding the centering support plate.

[0010] Furthermore, the centering support has an inner pad for electrical connection with the voice coil in the area near the voice coil, and an outer pad for electrical connection with the inner pad in the area away from the voice coil, with the outer pad exposed outside the miniature loudspeaker.

[0011] Furthermore, the central magnetic structure includes a lower central magnet, a central washer, and an upper central magnet connected sequentially from bottom to top, with the magnetic poles of the lower central magnet and the upper central magnet facing opposite directions; the side magnetic structure includes a lower side magnet, a side washer, and an upper side magnet connected sequentially from bottom to top, with the magnetic poles of the lower side magnet and the upper side magnet facing opposite directions; the magnetic poles of the upper central magnet and the upper side magnet also face opposite directions.

[0012] Furthermore, the number of magnetic circuit components is multiple, the number of voice coils is multiple, and the diaphragm assembly has multiple inner fixing parts, with each inner fixing part, magnetic circuit component, and voice coil corresponding to the other.

[0013] Furthermore, at least two adjacent lower yokes are integrally formed into a single structure.

[0014] The beneficial effects of this invention are as follows: By setting the inner mounting part of the skeleton as a thinned structure and placing it above or below the voice coil, this invention provides a larger longitudinal movement space for the voice coil without increasing the height of the magnetic circuit assembly, allowing the vibrating part of the diaphragm assembly to obtain a larger amplitude along with the voice coil. At the same time, the diaphragm assembly adopts an inner and outer double-folded ring structure, with the outer folded ring connected to the frame and the inner folded ring coupled to the voice coil through the skeleton. This ensures the compliance of the vibration system and, with the connection between the inner fixed part and the upper yoke, forms additional support for the center of the diaphragm, suppressing the split vibration under large amplitude. The magnetic circuit assembly forms upper and lower magnetic circuits with opposite directions between the central magnetic structure and the side magnetic structure, so that there is effective magnetic flux in both the upper and lower sections of the magnetic gap. The voice coil continuously cuts the magnetic lines of force throughout its stroke, thereby increasing the driving force coefficient without increasing the volume of the magnetic circuit. Ultimately, this allows the miniature loudspeaker to achieve a balance of large amplitude, low distortion, and high sensitivity within the limited installation height of the thin and light device. Attached Figure Description

[0015] Figure 1 A schematic diagram of the overall structure of a miniature loudspeaker; Figure 2 A cross-sectional view of a miniature loudspeaker; Figure 3 for Figure 2Enlarged view of detail A in the middle; Figure 4 A schematic diagram of part of the structure of a miniature loudspeaker; Figure 5 This is a schematic diagram of the lower yoke in a miniature loudspeaker.

[0016] Label Explanation: 1. Pot stand; 2. Diaphragm assembly; 21. Inner fixing part; 22. Inner folding ring part; 23. Vibrating part; 24. Outer folding ring part; 25. Outer fixing part; 3. Frame; 31. Internal mounting part; 32. Elevated part; 33. External mounting part; 331. Rectangular window; 4. Voice coil; 5. Magnetic circuit assembly; 51. Lower yoke; 511. Lower clearance slot; 52. Central magnetic structure; 521. Lower central magnet; 522. Central washer; 523. Upper central magnet; 53. Side magnetic structure; 531. Lower side magnet; 532. Side washer; 533. Upper side magnet; 54. Upper yoke; 541. Upper clearance slot; 55. Magnetic gap; 6. Centering support. Detailed Implementation

[0017] To explain in detail the technical content, objectives, and effects of this utility model, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0018] Please refer to Figures 1 to 5 A miniature loudspeaker includes a frame 1, a vibrating assembly, and a magnetic circuit assembly 5. The vibrating assembly includes a diaphragm assembly 2, a frame 3, and a voice coil 4. The diaphragm assembly 2 includes, from the inside out, an inner fixing part 21, an inner folding ring part 22, a vibrating part 23, an outer folding ring part 24, and an outer fixing part 25 connected sequentially. The outer fixing part 25 is connected to the frame 1. The frame 3 includes, from the inside out, an inner mounting part 31, a raised part 32, and an outer mounting part 33 connected sequentially. The outer mounting part 33 is connected to the vibrating part 23. The inner mounting part 31 is located above or below the voice coil 4 and is connected to the voice coil 4. The inner mounting part 31 has a thinned structure. The magnetic circuit assembly 5... The assembly includes a lower yoke 51, a central magnetic structure 52 disposed on the lower yoke 51, a side magnetic structure 53 disposed on the lower yoke 51, and an upper yoke 54 covering the central magnetic structure 52 and the side magnetic structure 53. The central magnetic structure 52 is located between at least one set of two oppositely arranged side magnetic structures 53. A magnetic gap 55 for the voice coil 4 to move is formed between the central magnetic structure 52 and the side magnetic structure 53. The magnetic circuit assembly 5 has an upper magnetic circuit and a lower magnetic circuit with opposite directions. The upper magnetic circuit passes through the upper part of the magnetic gap 55, and the lower magnetic circuit passes through the lower part of the magnetic gap 55. The inner fixing part 21 is connected to the upper yoke 54.

[0019] As can be seen from the above description, the beneficial effects of this utility model are as follows: By setting the inner mounting part 31 of the frame 3 as a thinned structure and placing it above or below the voice coil 4, this utility model provides a larger longitudinal movement space for the voice coil 4 without increasing the height of the magnetic circuit assembly 5, allowing the vibrating part 23 of the diaphragm assembly 2 to obtain a larger amplitude along with the voice coil 4; at the same time, the diaphragm assembly 2 adopts an inner and outer double-folded ring structure, with the outer folded ring part 24 connected to the frame 1 and the inner folded ring part 22 coupled to the voice coil 4 via the frame 3, which ensures the compliance of the vibration system. Furthermore, the connection between the inner fixing part 21 and the upper yoke 54 forms additional support for the center of the diaphragm, suppressing the split vibration under large amplitude. The magnetic circuit assembly 5 forms upper and lower magnetic circuits with opposite directions between the central magnetic structure 52 and the side magnetic structure 53, so that there is effective magnetic flux in both the upper and lower sections of the magnetic gap 55. The voice coil 4 continuously cuts the magnetic lines of force throughout the entire stroke, thereby increasing the driving force coefficient without increasing the volume of the magnetic circuit. Ultimately, this enables the miniature loudspeaker to achieve a balance of large amplitude, low distortion, and high sensitivity within the limited installation height of the thin and light device.

[0020] Furthermore, the thinned structure is formed by stamping or milling.

[0021] As can be seen from the above description, the thinning structure processing method is simple and the process is mature, which helps to ensure the consistency of the skeleton 3 manufacturing.

[0022] Furthermore, the cross-section of the raised section 32 is U-shaped.

[0023] As described above, the cross-section of the raised section 32 is concave, which can significantly improve the local bending stiffness of the frame 3 without increasing the material thickness. When the diaphragm assembly 2 performs large-amplitude reciprocating motion, the concave structure effectively suppresses the torsional deformation of the raised section 32, reduces the risk of vibration mass shift, thereby maintaining the voice coil 4 in the centered position in the magnetic gap 55 and reducing rubbing distortion. At the same time, the concave raised section 32 can also provide clearance for the inner folded ring section 22.

[0024] Furthermore, the outer mounting part 33 has a rectangular window 331, the voice coil 4 is provided corresponding to the rectangular window 331, the four corners of the rectangular window 331 are respectively connected to the elevating part 32, and each elevating part 32 is connected to the inner mounting part 31.

[0025] As can be seen from the above description, the outer mounting part 33 is provided with a rectangular window 331 and extends the bracket part 32 and the inner mounting part 31 from the four corners respectively, so that the voice coil 4 is symmetrically suspended at four points, and the vibration force is more evenly distributed.

[0026] Furthermore, the inner mounting portion 31 is located above the voice coil 4, and the upper yoke 54 has an upper clearance groove 541 for avoiding the inner mounting portion 31.

[0027] As described above, the inner mounting part 31 is placed above the voice coil 4 and an upper clearance groove 541 is opened on the upper yoke 54, so that the frame 3 and the magnetic circuit assembly 5 form a nested layout in the longitudinal direction. The upper clearance groove 541 provides a safe gap for the thinned inner mounting part 31 to prevent it from hitting the upper yoke 54, and obtains a larger amplitude while ensuring that the overall thickness remains unchanged.

[0028] Furthermore, it also includes a centering support 6, which connects the frame 1 and the voice coil 4. The connection between the centering support 6 and the voice coil 4 is located below the voice coil 4. The lower yoke 51 has a lower clearance groove 511 for avoiding the centering support 6.

[0029] As described above, a centering support plate 6 is added below the voice coil 4 and connected to the frame 1. In conjunction with the lower clearance groove 511 of the lower yoke 51, the centering support plate 6 has independent space for movement during vibration, forming a double-guide structure. When the frame 3 drives the voice coil 4 to make a large displacement movement, the centering support plate 6 provides additional radial restoring force, suppresses the lateral rolling of the voice coil 4, and significantly reduces nonlinear distortion under large amplitude.

[0030] Furthermore, the centering support 6 has an inner pad for electrical connection with the voice coil 4 in the area near the voice coil 4, and an outer pad for electrical connection with the inner pad in the area away from the voice coil 4, and the outer pad is exposed outside the miniature loudspeaker.

[0031] As described above, the centering support 6 integrates inner and outer solder pads and is electrically connected to the voice coil 4. The outer solder pad is exposed outside the miniature loudspeaker, allowing electrical signals to be directly fed into the voice coil 4 through the centering support 6. This eliminates the need for traditional flying wires, avoids noise generated by the lead wire hitting the diaphragm assembly 2 or colliding with the magnetic circuit assembly 5 during large amplitude vibrations, and simplifies the assembly process, improving production consistency and reliability.

[0032] Furthermore, the central magnetic structure 52 includes a lower central magnet 521, a central washer 522, and an upper central magnet 523 connected sequentially from bottom to top, with the magnetic poles of the lower central magnet 521 and the upper central magnet 523 facing opposite directions; the side magnetic structure 53 includes a lower side magnet 531, a side washer 532, and an upper side magnet 533 connected sequentially from bottom to top, with the magnetic poles of the lower side magnet 531 and the upper magnet 533 facing opposite directions; the magnetic poles of the upper central magnet 523 and the upper side magnet 533 face opposite directions.

[0033] As can be seen from the above description, both the central magnetic structure 52 and the side magnetic structure 53 adopt a sandwich structure of double magnets and washer, and the magnetic poles of the upper and lower magnets are arranged in opposite directions, so that the magnetic flux density in the magnetic gap 55 is more uniformly distributed along the height direction. The voice coil 4 is always in the high magnetic flux region throughout the entire long stroke range, which improves the electro-electric conversion efficiency and thus obtains a higher sound pressure level with the same magnetic circuit volume.

[0034] Furthermore, the number of magnetic circuit components 5 is multiple, the number of voice coils 4 is multiple, and the diaphragm assembly 2 has multiple inner fixing parts 21, with each inner fixing part 21, magnetic circuit assembly 5, and voice coil 4 corresponding to the other.

[0035] As can be seen from the above description, by setting multiple sets of magnetic circuit components 5, multiple voice coils 4 and corresponding number of internal fixing parts 21, the diaphragm assembly 2 is divided into multiple independent driving regions. Each region synchronously drives the diaphragm, the overall driving force is multiplied, the surface stress distribution of the diaphragm assembly 2 is more uniform, effectively suppressing local deformation under large amplitude, and achieving higher sound pressure output.

[0036] Furthermore, at least two adjacent lower yokes 51 are integrally formed into a single structure.

[0037] As can be seen from the above description, designing the adjacent lower yoke 51 as an integrated structure eliminates the assembly gap and positioning error between multiple magnetic circuits, ensures the relative position accuracy of each magnetic circuit component 5, avoids uneven driving force caused by magnetic circuit misalignment of multiple voice coils 4, and at the same time reduces the number of parts and bonding interfaces, thereby improving the overall structural strength and long-term reliability of the machine.

[0038] Please refer to Figures 1 to 5The first embodiment of this utility model is as follows: A miniature loudspeaker includes a frame 1, a vibration assembly, and a magnetic circuit assembly 5. The vibration assembly includes a diaphragm assembly 2, a frame 3, and a voice coil 4. The diaphragm assembly 2 includes an inner fixing part 21, an inner folded ring part 22, a vibration part 23, an outer folded ring part 24, and an outer fixing part 25 connected sequentially from the inside out. The outer fixing part 25 is connected to the frame 1. The frame 3 includes an inner mounting part 31, a raised part 32, and an outer mounting part 33 connected sequentially. The outer mounting part 33 is connected to the vibration part 23. The inner mounting part 31 is located above or below the voice coil 4 and is connected to the voice coil 4. The inner mounting part 31 has a thinned structure, which is formed by stamping or milling. That is, the inner mounting part 31 has a thinned structure. The thickness is less than the thickness of the raised part 32 and the thickness of the outer mounting part 33; the magnetic circuit assembly 5 includes a lower yoke 51, a central magnetic structure 52 disposed on the lower yoke 51, a side magnetic structure 53 disposed on the lower yoke 51, and an upper yoke 54 covering the central magnetic structure 52 and the side magnetic structure 53. The central magnetic structure 52 is located between at least one set of two oppositely arranged side magnetic structures 53. A magnetic gap 55 for the voice coil 4 to move is formed between the central magnetic structure 52 and the side magnetic structure 53. The magnetic circuit assembly 5 has an upper magnetic circuit and a lower magnetic circuit with opposite directions. The upper magnetic circuit passes through the upper part of the magnetic gap 55, and the lower magnetic circuit passes through the lower part of the magnetic gap 55. The inner fixing part 21 is connected to the upper yoke 54.

[0039] To better improve the split vibration phenomenon of the diaphragm assembly 2, in this embodiment, the outer mounting part 33 is plate-shaped and is bonded to the plane of the vibrating part 23. The outer mounting part 33 has a rectangular window 331, and the voice coil 4 is set corresponding to the rectangular window 331. The four corners of the rectangular window 331 are respectively connected to the support part 32, and each support part 32 is connected to the inner mounting part 31. The four inner mounting parts 31 in the same rectangular window 331 are respectively connected to the four corners of the voice coil 4.

[0040] Optionally, the inner mounting part 31 is located above the voice coil 4, and the upper yoke 54 has an upper clearance groove 541 for avoiding the inner mounting part 31. In this embodiment, the cross-section of the raised part 32 is U-shaped.

[0041] The miniature loudspeaker also includes a centering bracket 6, which connects the frame 1 and the voice coil 4. The connection between the centering bracket 6 and the voice coil 4 is located below the voice coil 4. The lower yoke 51 has a lower clearance groove 511 for avoiding the centering bracket 6. The area of ​​the centering bracket 6 near the voice coil 4 is provided with an inner pad for electrical connection with the voice coil 4, and the area of ​​the centering bracket 6 away from the voice coil 4 is provided with an outer pad for electrical connection with the inner pad. The outer pad is exposed outside the miniature loudspeaker.

[0042] In detail, the central magnetic structure 52 includes a lower central magnet 521, a central washer 522, and an upper central magnet 523 connected sequentially from bottom to top, with the magnetic poles of the lower central magnet 521 and the upper central magnet 523 facing opposite directions; the side magnetic structure 53 includes a lower side magnet 531, a side washer 532, and an upper side magnet 533 connected sequentially from bottom to top, with the magnetic poles of the lower side magnet 531 and the upper magnet 533 facing opposite directions; the magnetic poles of the upper central magnet 523 and the upper side magnet 533 face opposite directions.

[0043] In one or more embodiments, the number of magnetic circuit components 5 is multiple, the number of voice coils 4 is multiple, and the diaphragm assembly 2 has multiple inner fixing parts 21, with the inner fixing parts 21, the magnetic circuit components 5, and the voice coils 4 corresponding one-to-one.

[0044] Optionally, at least two adjacent lower yokes 51 are integrally formed structures. However, in this embodiment, the two lower yokes 51 are independent and not connected to each other.

[0045] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent modifications made based on the content of this utility model specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A miniature loudspeaker, characterized in that, include Sink stand; A vibration assembly includes a diaphragm assembly, a frame, and a voice coil. The diaphragm assembly includes an inner fixing part, an inner folded ring part, a vibrating part, an outer folded ring part, and an outer fixing part connected sequentially from the inside to the outside. The outer fixing part is connected to the frame. The frame includes an inner mounting part, a raised part, and an outer mounting part connected sequentially. The outer mounting part is connected to the vibrating part. The inner mounting part is located above or below the voice coil and is connected to the voice coil. The inner mounting part has a thinned structure. A magnetic circuit assembly includes a lower yoke, a central magnetic structure disposed on the lower yoke, a side magnetic structure disposed on the lower yoke, and an upper yoke covering the central magnetic structure and the side magnetic structure. The central magnetic structure is located between at least one set of two oppositely disposed side magnetic structures, and a magnetic gap is formed between the central magnetic structure and the side magnetic structures for the movement of the voice coil. The magnetic circuit assembly has an upper magnetic loop and a lower magnetic loop with opposite directions. The upper magnetic loop passes through the upper part of the magnetic gap, and the lower magnetic loop passes through the lower part of the magnetic gap. The inner fixing part is connected to the upper yoke.

2. The miniature loudspeaker according to claim 1, characterized in that, The thinning structure is formed by stamping or milling.

3. The miniature loudspeaker according to claim 1, characterized in that, The cross-section of the elevated section is U-shaped.

4. The miniature loudspeaker according to claim 1, characterized in that, The external mounting part has a rectangular window, the voice coil is set corresponding to the rectangular window, the four corners of the rectangular window are respectively connected to the elevating part, and each elevating part is connected to the internal mounting part.

5. The miniature loudspeaker according to claim 1, characterized in that, The inner mounting portion is located above the voice coil, and the upper yoke has an upper clearance groove for avoiding the inner mounting portion.

6. The miniature loudspeaker according to claim 5, characterized in that, It also includes a centering support plate, which connects the frame and the voice coil. The connection between the centering support plate and the voice coil is located below the voice coil. The lower yoke has a lower clearance groove for avoiding the centering support plate.

7. The miniature loudspeaker according to claim 6, characterized in that, The centering support has an inner pad for electrical connection with the voice coil in the area near the voice coil, and an outer pad for electrical connection with the inner pad in the area away from the voice coil. The outer pad is exposed outside the miniature loudspeaker.

8. The miniature loudspeaker according to claim 1, characterized in that, The central magnetic structure includes a lower central magnet, a central washer, and an upper central magnet connected sequentially from bottom to top, with the lower central magnet and the upper central magnet having opposite magnetic pole orientations; the side magnetic structure includes a lower side magnet, a side washer, and an upper side magnet connected sequentially from bottom to top, with the lower side magnet and the upper magnet having opposite magnetic pole orientations; the upper central magnet and the upper side magnet have opposite magnetic pole orientations.

9. The miniature loudspeaker according to claim 1, characterized in that, The number of magnetic circuit components is multiple, the number of voice coils is multiple, and the diaphragm assembly has multiple inner fixing parts. The inner fixing parts, the magnetic circuit components, and the voice coils correspond one-to-one.

10. The miniature loudspeaker according to claim 9, characterized in that, At least two adjacent lower yokes are integrally machined into a single structure.

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