loudspeaker

Abstract

This invention relates to the field of sound-generating device technology and discloses a loudspeaker. The loudspeaker includes a support element, a vibration system, and a magnetic circuit system. The vibration system includes a diaphragm and a voice coil. The diaphragm includes a dome, a surround surrounding the dome, and a mounting portion fixed to the support element. The magnetic circuit system includes a yoke and a main magnet. The surround includes a clamping portion connected to the dome, a first root extending from the clamping portion, a first connecting portion extending from the first root towards the yoke, an arcuate portion extending from the first connecting portion, a second connecting portion extending from the arcuate portion away from the yoke, and a second root extending from the second connecting portion to the mounting portion. The ratio of the height of the surround along the vibration direction to its width along a vertical direction perpendicular to the vibration direction is greater than 1. The minimum thickness of the first root is less than the thickness of the first connecting portion, and the minimum thickness of the second root is less than the thickness of the second connecting portion. The loudspeaker provided by this invention can improve distortion and enhance the performance of the sound-generating device.

Description

Technical Field

[0001] This invention relates to the field of sound-generating devices, and in particular to a loudspeaker. Background Technology

[0002] Loudspeakers are used to convert electrical signals into sound signals to transmit information. They are important components in electronic products and are related to the acoustic performance of electronic products.

[0003] A key indicator for measuring the acoustic performance of a loudspeaker is its FR (frequency response). Specifically, the low frequencies of a loudspeaker can be improved by increasing the voltage to increase the amplitude, thereby increasing the volume of air pushed and improving the frequency response; however, as the maximum amplitude of the loudspeaker diaphragm increases from 0.4mm to 0.8mm or even 1.0mm, polarization phenomena that cause distortion in the loudspeaker are introduced.

[0004] In existing technologies, a loudspeaker's vibration system typically includes a diaphragm for sound generation and a voice coil to drive the diaphragm's vibration. Due to space constraints, the voice coil can only be modified to a limited extent, so altering the diaphragm's shape design is a common method to reduce distortion. Specifically, stiffness is a physical quantity used to characterize the relationship between force and displacement in a vibrating system. The greater the nonlinearity of the stiffness curve, the more severe the distortion in a miniature loudspeaker. When the diaphragm vibrates to generate sound, its main deformation area is the surround, and its structural design directly affects the diaphragm's stiffness, thus affecting its acoustic performance. Summary of the Invention

[0005] The purpose of this invention is to provide a loudspeaker that can improve distortion and enhance the performance of the sound-generating device.

[0006] To address the aforementioned technical problems, embodiments of the present invention provide a loudspeaker. The loudspeaker includes a support element that encloses a receiving space, a vibration system mounted on the support element, and a magnetic circuit system mounted on the support element and driving the vibration system to vibrate and generate sound. The vibration system includes a diaphragm connected to the support element and received within the receiving space, and a voice coil fixed to the diaphragm facing the magnetic circuit system and driving the diaphragm to vibrate in the vibration direction. The diaphragm includes a dome located at a central position, a folded ring surrounding the dome, and a mounting portion surrounding the folded ring and fixed to the support element. The magnetic circuit system includes a magnetic yoke fixed to the support element and a main magnet fixed to the side of the magnetic yoke near the diaphragm. The folded ring includes a clamping portion connected to the dome, a first root extending from the clamping portion, a first connecting portion extending from the first root towards the yoke, an arc-shaped portion extending from the first connecting portion, a second connecting portion extending from one end of the arc-shaped portion away from the first connecting portion in a direction away from the yoke, and a second root extending from the second connecting portion to the mounting portion. The ratio of the height of the folded ring along the vibration direction to its width along a vertical direction perpendicular to the vibration direction is greater than 1. The minimum thickness of the first root is less than the thickness of the first connecting portion, and the minimum thickness of the second root is less than the thickness of the second connecting portion.

[0007] The loudspeaker provided by the embodiments of the present invention reduces stiffness at large amplitudes by thinning a portion of the surround, thereby causing diaphragm buckling. The locally thinned surround effectively mitigates the sharp increase in stiffness at large amplitudes, thus reducing the coefficient of the fourth term in the KX curve, and significantly reducing fifth-order distortion without affecting third-order distortion.

[0008] In some implementations, the ratio of the height of the fold along the vibration direction to its width along the vertical direction is 1.5-3.

[0009] In some embodiments, the ratio of the minimum thickness of the first root portion to the thickness of the first connecting portion is 0.75-0.9.

[0010] In some embodiments, the ratio of the minimum thickness of the second root portion to the thickness of the second connecting portion is 0.75-0.9.

[0011] In some embodiments, the ratio of the thickness of the first connecting portion to the thickness of the second connecting portion is 0.8-1.2.

[0012] In some embodiments, the thickness of the first connecting portion is less than the thickness of the second connecting portion.

[0013] In some embodiments, along the vibration direction of the diaphragm, the end of the arcuate portion connected to the first connecting portion and the end of the arcuate portion connected to the second connecting portion are flush with each other in the vertical direction, the height of the first connecting portion is less than the height of the second connecting portion, and the projection of the second root portion in the vertical direction at least partially overlaps with the dome.

[0014] In some embodiments, the clamping portion includes a first clamping portion fixed to the side of the dome facing the yoke, a second clamping portion fixed to the side of the dome away from the yoke, and a side portion connecting the first clamping portion and the second clamping portion, with a first root portion extending from the side portion and the thickness of the first root portion being less than the thickness of the side portion.

[0015] In some embodiments, the dome is provided with a number of spaced notches that are recessed inward from the outer edge, and the side of the clamping part is provided with protrusions that extend toward the notches and are received in the notches. The number of protrusions is the same as the number of notches and they are provided in a one-to-one correspondence.

[0016] In some embodiments, the mounting portion includes a receiving groove recessed from the side facing the support element in a direction away from the support element. The support element includes an inner wall surface that surrounds and forms a receiving space, and a positioning portion that protrudes from the inner wall surface toward the receiving space. The mounting portion abuts against the inner wall surface and the positioning portion is received in the receiving groove. Attached Figure Description

[0017] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0018] Figure 1 This is a schematic diagram of the KX curve for a loudspeaker; Figure 2 This is a three-dimensional structural schematic diagram of a loudspeaker provided in some embodiments of the present invention; Figure 3 This is a top view structural diagram of a loudspeaker provided in some embodiments of the present invention; Figure 4 It is along Figure 3 Schematic diagram of the cross-sectional structure along the AA direction; Figure 5 yes Figure 4 Enlarged structural diagram at point B; Figure 6 yes Figure 4 Enlarged structural diagram at point C; Figure 7 This is a schematic diagram of the dome structure in a loudspeaker provided in some embodiments of the present invention; Figure 8This is a schematic diagram of the structure of the surround in a loudspeaker provided in some embodiments of the present invention; Figure 9 yes Figure 8 Enlarged structural diagram at point D; Figure 10 This is an exploded structural diagram of a loudspeaker provided in some embodiments of the present invention; Figure 11 This is a schematic diagram of the KX curve of a loudspeaker provided in some embodiments of the present invention; Figure 12 This is a schematic diagram of total harmonic distortion of a loudspeaker provided in some embodiments of the present invention. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the various embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details are presented in the various embodiments of the present invention to facilitate a better understanding of the invention. However, the technical solutions claimed in the present invention can be implemented even without these technical details and with various changes and modifications based on the following embodiments. The division of the various embodiments below is for ease of description and should not constitute any limitation on the specific implementation of the present invention. The various embodiments can be combined with and referenced by each other without contradiction.

[0020] The following is combined with Figures 2 to 10 The structure of the loudspeaker provided in some embodiments of the present invention is described.

[0021] like Figures 2 to 10As shown, some embodiments of the present invention provide a loudspeaker including a support element 10 that surrounds and forms a receiving space 01, a vibration system 20 mounted on the support element 10, and a magnetic circuit system 30 mounted on the support element 10 and driving the vibration system 20 to vibrate and generate sound. The vibration system 20 includes a diaphragm 21 connected to the support element 10 and received within the receiving space 01, and a voice coil 22 fixed to the side of the diaphragm 21 facing the magnetic circuit system 30 and driving the diaphragm 21 to vibrate in the vibration direction. The diaphragm 21 includes a dome 211 located in the middle, a folded ring 212 surrounding the dome 211, and a mounting portion 213 surrounding the folded ring 212 and fixed to the support element 10. The magnetic circuit system 30 includes a magnetic yoke 31 fixed to the support element 10, and a main magnet 32 ​​fixed to the side of the magnetic yoke 31 near the diaphragm 21. The folded ring 212 includes a clamping portion 2120 connected to the dome 211, a first root portion 2121 extending from the clamping portion 2120, a first connecting portion 2122 extending from the first root portion 2121 toward the magnetic yoke 31, an arc-shaped portion 2123 extending from the first connecting portion 2122, a second connecting portion 2124 extending from one end of the arc-shaped portion 2123 away from the first connecting portion 2122 in a direction away from the magnetic yoke 31, and a second root portion 2125 extending from the second connecting portion 2124 to the connecting mounting portion 213. The folded ring 212 is located along the vibration direction (…). Figure 4 The height H (in the direction indicated by the middle arrow X) and the vertical direction (perpendicular to the vibration direction) Figure 4 The ratio of the width W (in the direction indicated by the middle arrow Y) is greater than 1, the minimum thickness D1 of the first root 2121 is less than the thickness D2 of the first connecting part 2122, and the minimum thickness D3 of the second root 2125 is less than the thickness D4 of the second connecting part 2124.

[0022] Figure 1 The image shows the KX curve, which describes the stiffness of a vibrating system at different positions. In a driver without a rear cavity, stiffness is mainly affected by the diaphragm shape and material. The KX curve and the BLX curve (the BLX curve is related to the voice coil and magnetic circuit design) are the two most important parameters determining the amount of distortion in a product.

[0023] Figure 1 The solid red line represents the simulation curve, while the dashed line represents the polynomial fitting curve. The KX curve corresponding to any diaphragm shape can be fitted using a polynomial (y = k0 + k1x + k2x² + k3x³…, where k0, k1, k2… are polynomial coefficients, k0 is the constant term, k1 is the coefficient of the first-order term, and so on). The higher the number of terms, the higher the fitting accuracy, and the closer the two curves are. By using polynomial fitting, the problem of reducing distortion can be transformed into adjusting the polynomial coefficients. Figure 1The polynomial corresponding to the KX curve is: y = -21.539x6+1.7443x5+18.656x4-2.2102x3-5.8153x2+0.5671x+1.4274.

[0024] The total distortion (THD) of a loudspeaker product can be broken down into second-order distortion (THD2), third-order distortion (THD3), and so on. The sum of all the distortions constitutes the total distortion. For conventional products, THD2 and THD3 account for a relatively high proportion of THD, and the main purpose of loudspeaker design is to reduce these two types of distortion.

[0025] For conventional products, simply reducing THD2 and THD3 is sufficient to meet the requirements. However, in some cases, due to the stringent requirements for THD3, the aspect ratio of the fold is large, which can lead to an abnormal increase in THD5, manifested as an abnormally large absolute value of k4 and a bulging of both ends of the KX curve.

[0026] The existing folded ring uses a U-shaped design, with a narrow and tall folded ring, which can effectively increase the absolute value of the quadratic term of the KX curve and reduce the third-order distortion. However, at large amplitudes, the fourth-order term increases, leading to high fifth-order distortion and high total distortion.

[0027] This invention effectively suppresses this trend and reduces THD5 through a thinning design at the root of the folded ring. Specifically, to improve distortion, thinning a localized area of ​​the folded ring creates diaphragm buckling under large amplitudes, commonly known as creases, thereby reducing stiffness under large amplitudes. The locally thinned folded ring effectively alleviates the sharp increase in stiffness under large amplitudes, thus reducing the fourth-order coefficient of the KX curve and significantly reducing fifth-order distortion without affecting third-order distortion.

[0028] Understandably, since the first root portion 2121 has a minimum thickness D1, the thickness of the first root portion 2121 gradually decreases from the connection point with the clamping portion 2120 towards the minimum thickness, and gradually increases from the minimum thickness to the connection point with the first connecting portion 2122. Therefore, the minimum thickness D1 of the first root portion 2121 is smaller than the thickness of the first connecting portion 2122, and its thickness at all points is also smaller than the thickness of the first connecting portion 2122. Similarly, the second root portion 2125 has a minimum thickness D3, and the thickness of the second root portion 2125 gradually decreases from the connection point with the mounting portion 213 towards the minimum thickness, and gradually increases from the minimum thickness to the connection point with the second connecting portion 2124. Therefore, the minimum thickness D3 of the second root portion 2125 is smaller than the thickness of the second connecting portion 2124, and its thickness at all points is also smaller than the thickness of the second connecting portion 2124.

[0029] In this embodiment, the first connecting portion 2122 is a structure of equal thickness, and D2 is a unique value; the second connecting portion 2124 is also a structure of equal thickness, and D4 is also a unique value; in other embodiments, the first connecting portion 2122 and the second connecting portion 2124 may also be structures of non-equal thickness, as long as they satisfy the thickness relationship with the first root portion 2121 and the second root portion 2125 respectively.

[0030] The support element 10 provides a mounting base for other components. The support element 10 can be in the form of a housing, a frame, or a basket. The support element 10 can also be connected to external components to integrate the speaker into electronic products. The support element 10 forms a receiving space 01. When the diaphragm 21 is mounted on the support element 10, the diaphragm 21 and the support element 10 enclose a space for transmitting sound waves generated by the vibration of the diaphragm 21 to the outside, thus transmitting sound to the outside world.

[0031] The vibration system 20 is the part of the loudspeaker that can generate sound through vibration. The voice coil 22 can drive the diaphragm 21 to vibrate under the action of an electrical signal, so as to perform electroacoustic conversion and convert the electrical signal into an acoustic signal. The diaphragm 21 of the vibration system 20 corresponds to the part that can vibrate. The diaphragm 21 can adopt a single-layer structure or a multi-layer structure, and the material of the diaphragm 21 can be one or more of the following polymer materials: Peek, TPU, TPEE, rubber, etc.

[0032] The dome 211 of the diaphragm 21 is located in the middle region. The clamping part 2120 formed at the inner edge of the fold 212 can be used to fix the dome 211. The outer side of the fold 212 can be fixed with the mounting part 213, thereby forming a vibration system 20 integrally connected to the support element 10.

[0033] The magnetic circuit system 30 can cooperate with the voice coil 22. After the voice coil 22 is energized, the system interacts with the voice coil 22, causing the diaphragm 21 to vibrate and produce sound. A magnetic gap can be formed between the main magnet 32 ​​and the side magnet 33 of the magnetic circuit system 30. A portion of the voice coil 22 can extend into the magnetic gap so that the voice coil 22 can interact with the magnetic circuit system 30.

[0034] The folded ring 212 has a U-shaped cross-section. The first root portion 2121 of the folded ring 212 corresponds to the part connected to the dome 211, which can be connected to the inner side of the first root portion 2121. The edge of the dome 211 can be fixed to one side of the first root portion 2121. The first connecting portion 2122 corresponds to the part of the folded ring 212 that extends towards the magnetic yoke 31, forming a protruding portion to one side. The arc-shaped portion 2123 is located at the bottom of the first connecting portion 2122, forming a U-shaped bottom and serving as a turning part, connecting the two extended portions. The second connecting portion 2124 is located on the side of the arc-shaped portion 2123 away from the first connecting portion 2122, forming a gap between the second connecting portion 2124 and the first connecting portion 2122, and the second connecting portion 2124 and the first connecting portion 2122 are located on the same side of the arc-shaped portion 2123. The second root portion 2125 is located at one end of the second connecting portion 2124 and cooperates with the mounting portion 213. The second root portion 2125 and the first root portion 2121 are provided for different connecting portions, and exist as the roots of the corresponding connecting portions. The second root portion 2125 and the first root portion 2121 are located on both sides of the arc-shaped portion 2123.

[0035] The height H of the folded ring 212 along the vibration direction corresponds to the vertical dimension of the folded ring 212, and the width W of the folded ring 212 in the vertical direction along the vibration direction corresponds to the horizontal dimension of the folded ring 212. The folded ring 212 is designed as a narrow and tall shape with a height-to-width ratio greater than 1, that is, the ratio between H and W is at least greater than 1, so that the absolute value of k2 increases to reduce THD3. The height of the folded ring 212 along the vibration direction refers to the distance along the vibration direction between the point where the folded ring 212 has the smallest perpendicular distance from the yoke 31 (in this embodiment, the point where the arc-shaped part 2123 is closest to the yoke 31) and the point where the perpendicular distance from the yoke 31 is the largest; for example, Figure 6 As shown, the height H of the folded ring 212 can be calculated starting from the outer side of the arc-shaped portion 2123. The distance between the inner starting point of the arc-shaped portion 2123 and the highest point on the inner side of the folded ring 212 is the height H of the folded ring 212. The width of the folded ring 212 can be obtained by calculating the width of the thinner root side of the U-shaped cross-section formed by the folded ring 212. It should be noted that the width of the folded ring 212 in the vertical direction is the maximum distance between the side of the connection between the first root portion 2121 and the clamping portion 2120 away from the second root portion 2125 and the side of the connection between the second root portion 2125 and the mounting portion 213 away from the first root portion 2121.

[0036] Specifically, by locally thinning the diaphragm, buckling can be caused under large amplitude, effectively reducing the stiffness of the diaphragm under large amplitude. In practice, the minimum thickness of the thinnest part of the first root 2121 can be taken as the thickness of the first root 2121, and the minimum thickness of the thinnest part of the second root 2125 can be taken as the thickness of the second root 2125. Preferably, in order to ensure the structural strength of the fold ring 212, the minimum thickness D1 of the first root 2121 and the minimum thickness D3 of the second root 2124 are not less than 0.05 mm.

[0037] In some embodiments, the ratio of the height H of the fold 212 along the vibration direction to the width W along the vertical direction can be 1.5 to 3.

[0038] In practice, under standard voice coil design (assuming a symmetrical BLX curve), THD3 and k2 are strongly correlated (the larger the absolute value of k2, the lower the THD3). Based on this rule, THD3 can be reduced by designing the surround 212 with a narrow and tall shape where the ratio of height H to width W is greater than 1, thereby increasing the absolute value of k2. Theoretically, the larger the ratio, i.e., the taller the surround 212, the more obvious the effect. However, due to space limitations, the height H of the surround 212 cannot be increased indefinitely. Therefore, the aspect ratio of the surround 212 can be controlled within the range of 1.5-3.

[0039] In other words, the ratio of H to W can be between 1.5 and 3. For example, the ratio of H to W can be 1.5, 2, 2.5, or 3. By controlling the aspect ratio of the surround 212 to 1.5-3, it can be ensured that the height H of the surround 212 is relatively large, making the effect of reducing THD3 more obvious, while also ensuring that the surround 212 will not affect the assembly of other components due to its large height H. When the aspect ratio of the surround 212 is less than 1.5, the difference between the height H and the width W of the surround 212 is small, the absolute value of k2 is small, and THD3 is large. When the aspect ratio of the surround 212 is greater than 3, the height H of the surround 212 is large, the space occupied by the surround 212 in the vibration direction is large, which can easily cause interference with other components and also affect the size of the speaker, which is not conducive to the miniaturization of the speaker.

[0040] In some embodiments, the ratio of the minimum thickness D1 of the first root portion 2121 to the thickness D2 of the first connecting portion 2122 is 0.75-0.9.

[0041] The minimum thickness D1 of the first root portion 2121 corresponds to the thickness of the folded ring 212 after local thinning, and the thickness D2 of the first connecting portion 2122 corresponds to the thickness of the folded ring 212 without thinning. By making the ratio of the minimum thickness D1 of the first root portion 2121 to the minimum thickness D2 of the first connecting portion 2122 0.75-0.9, the thinning thickness of the first root portion 2121 can be controlled within a certain range, ensuring the strength of the first root portion 2121 and ensuring the improvement effect on distortion.

[0042] In practice, the ratio of the minimum thickness D1 of the first root portion 2121 to the thickness D2 of the first connecting portion 2122 can be 0.75, 0.80, 0.85, or 0.9. This avoids the situation where the minimum thickness D1 of the first root portion 2121 is too large, which would prevent the thickness at the first root portion 2121 from being effectively reduced, thus ensuring the improvement effect on the distortion phenomenon. It also avoids the problem of insufficient strength due to the minimum thickness D1 of the first root portion 2121 being too small. When the ratio of the minimum thickness D1 of the first root portion 2121 to the thickness D2 of the first connecting portion 2122 is greater than 0.9, the thinning thickness of the first root portion 2121 is small, and the remaining thickness of the first root portion 2121 is still large, which cannot achieve the purpose of reducing the stiffness of the first root portion 2121, and therefore cannot improve the distortion phenomenon. When the ratio of the minimum thickness D1 of the first root portion 2121 to the thickness D2 of the first connecting portion 2122 is less than 0.75, the thinning thickness of the first root portion 2121 is large, and the thickness of the remaining part of the first root portion 2121 is small, which will affect the reliability of its own structure and increase the processing difficulty.

[0043] In other embodiments, the ratio of the minimum thickness D3 of the second root portion 2125 to the thickness D4 of the second connecting portion 2124 is 0.75-0.9.

[0044] The minimum thickness D3 of the second root portion 2125 corresponds to the thickness after thinning at a localized location of the folded ring 212, and the thickness D4 of the second connecting portion 2124 corresponds to the thickness of the un-thinned portion of the folded ring 212. By setting the ratio of the minimum thickness D3 of the second root portion 2125 to the thickness D4 of the second connecting portion 2124 to 0.75-0.9, the thinning thickness of the second root portion 2125 can be controlled within a certain range, ensuring the strength of the second root portion 2125 and ensuring the improvement effect on distortion.

[0045] In practice, the ratio of the minimum thickness D3 of the second root portion 2125 to the thickness D4 of the second connecting portion 2124 can be 0.75, 0.80, 0.85, or 0.9. This avoids the situation where the minimum thickness D3 of the second root portion 2125 is too large, which would prevent the thickness at the second root portion 2125 from being effectively reduced, thus ensuring the improvement effect on distortion. It also avoids the problem of insufficient strength due to the minimum thickness D3 of the second root portion 2125 being too small. When the ratio of the minimum thickness D3 of the second root portion 2125 to the thickness D4 of the second connecting portion 2124 is greater than 0.9, the thinning thickness of the second root portion 2125 is relatively small, and the remaining thickness of the second root portion 2125 is still relatively large, which cannot achieve the purpose of reducing the stiffness of the second root portion 2125, and therefore cannot improve the distortion phenomenon. When the ratio of the minimum thickness D3 of the second root portion 2125 to the thickness D4 of the second connecting portion 2124 is less than 0.75, the thinning thickness of the second root portion 2125 is large, and the thickness of the remaining part of the second root portion 2125 is small, which will affect the reliability of its own structure and increase the processing difficulty.

[0046] In the technical solution of the present invention, the thickness D2 of the first connecting portion 2122 can be less than, equal to or greater than the thickness D4 of the second connecting portion 2124, and is specifically determined according to the actual application scenario. For example, the ratio of the thickness D2 of the first connecting portion 2122 to the thickness D4 of the second connecting portion 2124 can be set to 0.8-1.2.

[0047] In some embodiments, the thickness D2 of the first connecting portion 2122 may be less than the thickness D4 of the second connecting portion 2124, that is, the ratio of the thickness D2 of the first connecting portion 2122 to the thickness D4 of the second connecting portion 2124 is between 0.8 and 1.0.

[0048] The thickness D2 of the first connecting portion 2122 and the thickness D4 of the second connecting portion 2124 correspond to the sidewall thickness at the bend of the fold ring 212. By controlling the thickness D2 of the first connecting portion 2122 to be less than the thickness D4 of the second connecting portion 2124, the thickness ratio of the first connecting portion 2122 and the second connecting portion 2124 can be adjusted, thereby adjusting the stiffness of the two sidewalls, which can adjust the quadratic term coefficient and improve quadratic distortion.

[0049] In practice, under standard voice coil design (assuming a symmetrical BLX curve), THD2 and k1 are strongly correlated (the smaller the absolute value of k1, the lower THD2). Based on this rule, THD2 can be reduced by adjusting the thickness ratio of the inner and outer sides of the surround 212, thereby adjusting k1 and reducing its absolute value, thus reducing THD2. When the ratio of the thickness D2 of the first connecting part 2122 to the thickness D4 of the second connecting part 2124 is less than 0.8, the thickness D2 of the first connecting part 2122 is relatively small, and the difference between the thickness D2 of the first connecting part 2122 and the thickness D4 of the second connecting part 2124 is small, which cannot achieve the purpose of adjusting k1, and therefore cannot improve the distortion phenomenon. When the ratio of the thickness D2 of the first connecting part 2122 to the thickness D4 of the second connecting part 2124 is greater than 1.2, the thickness of the first connecting part 2122 is larger, and the difference between the thickness D2 of the first connecting part 2122 and the thickness D4 of the second connecting part 2124 is larger, which will lead to a large difference in vibration on both sides, thereby affecting the sound quality.

[0050] In this embodiment, in order to ensure the reliability of the folding ring 212 and maximize the space utilization rate without interference, the thickness D2 of the first connecting part 2122 and the thickness D4 of the second connecting part 2124 are both not less than 0.05mm.

[0051] In some embodiments, along the vibration direction of the fold ring 212, the end of the arc-shaped portion 2123 connected to the first connecting portion 2122 and the end of the arc-shaped portion 2123 connected to the second connecting portion 2124 are flush with each other in the vertical direction, the height of the first connecting portion 2122 is less than the height of the second connecting portion 2124, and the projection of the second root portion 2125 in the vertical direction at least partially overlaps with the dome 211.

[0052] In other words, the bottom ends of the connecting portions on both sides of the arc-shaped portion 2123 are flush vertically, and the top end of the first connecting portion 2122 is lower than the top end of the second connecting portion 2124. This also causes the first root portion 2121 and the second root portion 2125 to be located on different planes, and the first root portion 2121 and the second root portion 2125 have different distances from the magnetic yoke 31. The second root portion 2125 is farther away from the magnetic yoke 31 than the first root portion 2121, forming a larger distance between them. The second root portion 2125 and the dome 211 are arranged in a partially or completely overlapping manner vertically.

[0053] The second root portion 2125 is staggered from the first root portion 2121, which allows the side where the second root portion 2125 and the second connecting portion 2124 are located to have a larger size, ensuring that the thinning portion is set at different height positions.

[0054] like Figure 5 and Figure 6As shown, the clamping portion 2120 may include a first clamping portion 212a fixed to the side of the dome 211 facing the yoke 31, a second clamping portion 212b fixed to the side of the dome 211 away from the yoke 31, and a side portion 212c connecting the first clamping portion 212a and the second clamping portion 212b. A first root portion 2121 extends from the side portion 212c, and the thickness of the first root portion 2121 is less than the thickness of the side portion 212c.

[0055] There is a gap between the first clamping portion 212a and the second clamping portion 212b, which can form a space for clamping the dome 211. The first clamping portion 212a and the second clamping portion 212b can limit the dome 211 along the thickness direction of the dome 211. The first clamping portion 212a and the second clamping portion 212b can be formed in a shape where one is more convex than the other on the inner side of the folding ring 212, or they can be formed in a shape that is flush with each other on the inner side of the folding ring 212.

[0056] Side portion 212c is connected to the first clamping portion 212a and the second clamping portion 212b respectively, and can cooperate with the first clamping portion 212a and the second clamping portion 212b to form a U-shaped groove. Side portion 212c can limit the dome 211 along the outer edge of the dome 211. Side portion 212c is located on the side of the first root portion 2121 away from the first connecting portion 2122, and the thickness of side portion 212c can be kept consistent throughout. The thickness of side portion 212c is greater than the thickness of the first root portion 2121 to ensure the structural strength of clamping portion 2120.

[0057] In some embodiments, the dome 211 may be provided with a plurality of spaced notches 2111 recessed from the outer edge inward. The side portion 212c of the clamping portion 2120 is provided with a protrusion 212d extending toward the notch 2111 and being received within the notch 2111, the protrusion 212d being the same number as the notch 2111 and being provided in a one-to-one correspondence.

[0058] A notch 2111 is formed at the edge of the dome 211. The notch 2111 of the dome 211 can mate with the protrusion 212d provided on the side 212c to position the assembly of the dome 211. The dome 211 as a whole can be set into a regular shape such as a rectangle, a circle, or an irregular shape. The corners of the dome 211 can be rounded to create a smoother transition.

[0059] A protrusion 212d is formed inside the clamping portion 2120 of the folded ring 212. The opening of the groove containing the protrusion 212d faces the center of the folded ring 212. The protrusion 212d is adjacent to the second clamping portion 212b and can cooperate with the notch 2111 at the edge of the dome 211 to ensure the connection stability between the dome 211 and the folded ring 212. The edge of the dome 211 away from the notch 2111 is located in the groove of the clamping portion 2120, that is, between the first clamping portion 212a and the second clamping portion 212b, and can form a snap-fit ​​with the clamping portion 2120 of the folded ring 212, and is limited by the folded ring 212. The notch 2111 at the edge of the dome 211 can cooperate with the protrusion 212d of the clamping part 2120. The protrusion 212d can abut against the notch 2111 to position the dome 211 and at the same time enhance the connection between the dome 211 and the folding ring 212.

[0060] like Figures 7 to 9 As shown, there can be multiple notches 2111 and protrusions 212d.

[0061] Figure 7 There are six notches 2111 at the edge of the dome 211 of the China-Israel sphere. Figure 8 and Figure 9 The following explanation uses an example where six protrusions 212d are provided on the inner side of the folded ring 212. In practice, the number of protrusions 212d of the notch 2111 can also be two, three, four, or eight. A larger number of notches 2111 can be provided at the longer edge of the dome 211 to ensure the stability of the fit between the dome 211 and the folded ring 212.

[0062] like Figure 8 As shown, the mounting portion 213 includes a receiving groove 2131 recessed from the side facing the support element 10 in a direction away from the support element. The support element 10 includes an inner wall surface surrounding and forming a receiving space 01, and a positioning portion 1011 protruding from the inner wall surface toward the receiving space 01. The mounting portion 213 abuts against the inner wall surface, and the positioning portion 1011 is received within the receiving groove 2131.

[0063] The mounting part 213 can cooperate with the positioning part 1011 of the support element 10 through the receiving groove 2131 to achieve a snap-fit ​​between the two. The positioning part 1011 of the support element 10 can be snapped into the receiving groove 2131 of the mounting part 213, and multiple surfaces can be formed between the mounting part 213 and the support element 10 to ensure the stability of the connection between the two.

[0064] like Figure 5 and Figure 6As shown, the thinning design of the first root portion 2121 and the second root portion 2125 occurs on the inner wall surface of the fold ring 212. That is, along the direction away from the arc portion 2123, the side of the first root portion 2121 that is close to the second root portion 2125 gradually approaches the dome 211, and the side of the second root portion 2125 that is close to the first root portion 2121 gradually approaches the dome 211.

[0065] Under large amplitude, the thinned portions of the first root 2121 and the second root 2125 can form creases to reduce the stiffness at the root of the fold ring 212 and improve the distortion phenomenon.

[0066] In practice, the thinning of the first root 2121 and the second root 2125 can also occur on the outer wall surface of the fold ring 212.

[0067] Furthermore, the inner wall surfaces at the thinned portions of the first root 2121 and the second root 2125 can all have the same slope. That is, the thinned portion at the root of the fold ring 212 can be formed by uniformly thinning one side of the inner wall surface.

[0068] In some embodiments, the first root portion 2121 and the second root portion 2125 may be provided with thinning portions in the entire circumferential direction, that is, the first root portion 2121 and the second root portion 2125 are both thinned in the direction surrounding the center of the fold ring 212.

[0069] like Figure 10 As shown, the loudspeaker magnetic circuit design can adopt a multi-layered structure. The upper structure includes an upper main magnet 321 and an upper side magnet 331. The lower structure includes a lower main magnet 322 and a lower side magnet 332, and a washer 34 can be installed on the lower main magnet 322. The washer 34 and the yoke 31 are magnetically conductive structures, while the magnets are magnetically supplied structures. The upper structure can be installed via the base 11 and limited by the clamp 12. Alternatively, the voice coil 22 can also adopt a multi-layered design, with an upper voice coil 221 and a lower voice coil 222. When an audio current is passed through the voice coil 22 of the loudspeaker, the voice coil 22 generates an alternating magnetic field under the influence of the current, while the permanent magnet simultaneously generates a constant magnetic field with unchanged magnitude and direction. The magnitude and direction of the magnetic field generated by the voice coil 22 continuously change with the change of the audio current. The interaction of these two magnetic fields causes the voice coil 22 to move perpendicular to the direction of the current in the voice coil 22. The voice coil 22 is connected to the diaphragm 21, allowing the voice coil 22 to drive the diaphragm 21 to vibrate. The vibration of the diaphragm 21 causes the air to vibrate, producing sound. A mask 101 can be installed above the diaphragm 21 for protection. A gasket 102 can be installed at the bottom of the mask 101 to cooperate with the support element 10.

[0070] Figure 11 The KX curves corresponding to the loudspeakers provided in some embodiments of the present invention are illustrated. Figure 12 The total harmonic distortion diagram for a loudspeaker provided in some embodiments of the present invention. Figure 11 The polynomial of the KX curve corresponding to the loudspeaker provided in some embodiments of the present invention is: y = -12.555x 6 +9.4169x 5 +15.208x 4 -2.9119x 3 -5.1297x 2 +0.1746x+1.3772 (yellow solid line). It can be seen that the speaker provided by this invention locally thins the root of the U-shaped surround 212, effectively alleviating the sharp increase in stiffness of the surround 212 under large amplitude, thereby reducing the coefficient of the fourth term of the KX curve and preventing the ends of the KX curve from warping. This significantly reduces fifth-order distortion without affecting third-order distortion.

[0071] Those skilled in the art will understand that the above embodiments are specific examples of implementing the present invention, and in practical applications, various changes in form and detail may be made without departing from the spirit and scope of the present invention.

Claims

1. A loudspeaker comprising a support element surrounding a receiving space, a vibration system mounted on the support element, and a magnetic circuit system mounted on the support element and driving the vibration system to vibrate and generate sound, the vibration system comprising a diaphragm connected to the support element and received within the receiving space, and a voice coil fixed to the diaphragm facing the magnetic circuit system and driving the diaphragm to vibrate in a vibration direction, the diaphragm comprising a dome located at a central position, a folded ring surrounding the dome, and a mounting portion surrounding the folded ring and fixed to the support element, the magnetic circuit system comprising a yoke fixed to the support element, and a main magnet fixed to the yoke near the diaphragm, the folded ring comprising a clamping portion connected to the dome, a first root extending from the clamping portion, a first connecting portion extending from the first root towards the yoke, an arcuate portion extending from the first connecting portion, a second connecting portion extending from one end of the arcuate portion away from the first connecting portion in a direction away from the yoke, and a second root extending from the second connecting portion to the mounting portion, characterized in that... The ratio of the height of the fold along the vibration direction to its width along a vertical direction perpendicular to the vibration direction is greater than 1. The minimum thickness of the first root is less than the thickness of the first connecting part, and the minimum thickness of the second root is less than the thickness of the second connecting part.

2. The loudspeaker according to claim 1, characterized in that, The ratio of the height of the fold along the vibration direction to its width along the vertical direction is 1.5-3.

3. The loudspeaker according to claim 1, characterized in that, The ratio of the thickness of the first root portion to the thickness of the first connecting portion is 0.75-0.

9.

4. The loudspeaker according to claim 1, characterized in that, The ratio of the thickness of the second root portion to the thickness of the second connecting portion is 0.75-0.

9.

5. The loudspeaker according to claim 1, characterized in that, The ratio of the thickness of the first connecting part to the thickness of the second connecting part is 0.8-1.

2.

6. The loudspeaker according to claim 5, characterized in that, The thickness of the first connecting part is less than the thickness of the second connecting part.

7. The loudspeaker according to claim 1, characterized in that, Along the vibration direction of the diaphragm, the end of the arc-shaped portion connected to the first connecting portion and the end of the arc-shaped portion connected to the second connecting portion are flush with the vertical direction, the height of the first connecting portion is less than the height of the second connecting portion, and the projection of the second root portion along the vertical direction at least partially overlaps with the dome.

8. The loudspeaker according to claim 1, characterized in that, The clamping portion includes a first clamping portion fixed to the spherical dome on the side facing the magnetic yoke, a second clamping portion fixed to the spherical dome on the side away from the magnetic yoke, and a side portion connecting the first clamping portion and the second clamping portion. The first root portion extends from the side portion, and the thickness of the first root portion is less than the thickness of the side portion.

9. The loudspeaker according to claim 8, characterized in that, The dome is provided with a number of spaced notches that are recessed inward from the outer edge, and the side of the clamping part is provided with protrusions that extend toward the notches and are received in the notches. The number of protrusions is the same as the number of notches and they are arranged in a one-to-one correspondence.

10. The loudspeaker according to claim 1, characterized in that, The mounting portion includes a receiving groove recessed from one side toward the support element in a direction away from the support element. The support element includes an inner wall surface surrounding the receiving space and a positioning portion protruding from the inner wall surface toward the receiving space. The mounting portion abuts against the inner wall surface and the positioning portion is received in the receiving groove.

Images