Vibrating diaphragm and sound production device

Abstract

The utility model discloses a diaphragm and a sounding device, including a vibration portion, a folded ring portion and an outer edge portion, the folded ring portion is a rectangular structure with a corner, the folded ring portion includes two long sides, two short sides and a corner connecting the adjacent long sides and short sides, and the outer edge portion is a rectangular structure with a corner. The long edge is a thick edge, and the short edge is a thin edge, or the short edge is a thick edge, and the long edge is a thin edge; the thickness of the corner and the thickness of the thick edge are both larger than the thickness of the thin edge. According to the swing mode of the loudspeaker diaphragm, the local thickness of the folding ring part of the diaphragm is specifically thickened, so that the strength of the diaphragm is enhanced, the polarization problem is solved, and the situation that the modulus is increased too high and the mass is increased too much due to the fact that the diaphragm is integrally thickened is avoided. Compared with a solution in the current industry, the performance can be better balanced under the condition of solving polarization.

Description

Technical Field

[0001] The utility model relates to the technical field of acoustics, in particular to a diaphragm for a speaker module and a sound generating device adopting the diaphragm structure. Background Art

[0002] With the expansion of the consumer electronics market, a large number of consumer electronic products such as mobile phones and laptop computers have been widely used. As an important acoustic component in consumer electronic products, speakers have a wide range of demands. With the improvement of people's requirements for consumer electronic products, the performance of speakers has also attracted more and more attention.

[0003] Among the performances of speakers, the most important one is FR (frequency response). With the application of intelligent power amplifiers, the low frequency of speakers can be increased by increasing the voltage to increase the amplitude, thereby increasing the volume of the pushed air and improving the frequency response. In this process, with the performance requirements, the maximum amplitude Xmax of micro speakers has been increased from 0.4mm before to 0.8mm - 1.0mm now. The increase in amplitude brings greater polarization problems, resulting in serious speaker buzzing, affecting FR, THD and auditory effects, and leading to failure modes such as wire breakage and membrane rupture in the reliability of products.

[0004] The conventional design of the surround of the speaker diaphragm is of equal thickness. Although the surround thickness is equal, the structural strength at different positions of the diaphragm is not the same, and it cannot meet the stiffness requirements and other requirements needed at specific positions of the actual product. In particular, the strength at the four corners of the diaphragm is insufficient, and there will be a swaying phenomenon during vibration. When the voltage is larger and the displacement is larger, the swaying phenomenon is more likely to occur, and the diaphragm vibration is not stable, resulting in the speaker generating noise and affecting the acoustic performance of the speaker.

[0005] The vibration patterns of conventional speakers are generally piston motion (first-order vibration), rocking motion along the short side (second-order modal vibration) and rocking motion along the long side (third-order modal vibration). When second-order or third-order modal rocking vibrations occur, the product will have unstable vibrations, thus affecting the performance.

[0006] In the prior art, some designs in the industry improve polarization by thickening the diaphragm as a whole or locally thickening the four corners of the diaphragm surround. This can indeed achieve certain effects, but the problem is that overall thickening will cause too much increase in modulus and mass. The increase in modulus leads to an increase in frequency F0, resulting in a decrease in low-frequency sensitivity, and the increase in mass leads to a decrease in mid-frequency sensitivity. These improvement schemes for speaker diaphragms all have certain defects. Summary of the Utility Model

[0007] The technical problem to be solved by the present utility model is to provide a diaphragm that solves the polarization problem while not increasing the mass too much.

[0008] To solve the above technical problem, the technical solution of the present utility model is: a diaphragm, including a vibrating part, a folding ring part disposed around the outer periphery of the vibrating part, and an outer edge part disposed around the outer periphery of the folding ring part. The folding ring part has a rectangular structure with corners. The folding ring part includes two long sides, two short sides, and corners connecting adjacent long sides and short sides. The long sides are thick sides and the short sides are thin sides, or the short sides are thick sides and the long sides are thin sides;

[0009] The thickness of the corners and the thickness of the thick sides are both greater than the thickness of the thin sides.

[0010] Preferably, the thickness of the corners is equal to the thickness of the thick sides.

[0011] Preferably, the corners include a corner base layer and a corner thickening layer compounded on the corner base layer, and the thick sides include a thick side base layer and a thick side thickening layer compounded on the thick side base layer.

[0012] Preferably, the thickness of the corner thickening layer is greater than or equal to the thickness of the short side thickening layer.

[0013] Preferably, the corner base layer, the thick side base layer and the thin side are of an integral structure and have equal thickness.

[0014] Preferably, the corners and the thick sides are made of the same material.

[0015] Preferably, the thick sides and the thin sides are made of the same material;

[0016] Or, the thick sides and the thin sides are made of different materials;

[0017] Or, the hardness of the thick sides is different from the hardness of the thin sides.

[0018] Preferably, the materials of the corners, the thick sides and the thin sides include Peek, TPU, TPEE or rubber.

[0019] Preferably, the radial cross-section of the folding ring part includes an inner arc section connected to the vibrating part, an outer arc section connected to the outer edge part, and a top arc section connecting the inner arc section and the outer arc section;

[0020] The thickness of the outer arc section is not less than the thickness of the top arc section; the thickness of the outer arc section is greater than the thickness of the inner arc section, and / or, the thickness of the top arc section is not less than the thickness of the inner arc section.

[0021] The beneficial effects of this application are:

[0022] A diaphragm described in this application includes a vibrating part, a surround part, and an outer edge part. The surround part has a rectangular structure with corners. The surround part includes two long sides, two short sides, and corners connecting adjacent long sides and short sides. The long sides are thick sides, and the short sides are thin sides, or the short sides are thick sides, and the long sides are thin sides. The thickness of the corners and the thickness of the thick sides are both greater than the thickness of the thin sides. According to the rocking mode (second-order mode or third-order mode) of the speaker diaphragm, a targeted local thickness thickening design of the diaphragm surround part is carried out. On the one hand, the strength of the diaphragm is strengthened, and polarization is solved. On the other hand, it does not cause the modulus to rise too high and the mass to increase too much due to the overall thickening of the diaphragm. Compared with the current industry solutions, it can better balance performance while solving polarization.

[0023] The present utility model also provides a sound generating device to solve the above technical problems.

[0024] To solve the above technical problems, the technical solution of the present utility model is: a sound generating device includes a vibration system and a magnetic circuit system for driving the vibration system to vibrate and generate sound. The vibration system includes the diaphragm described above.

[0025] For the sound generating device adopting the above-structured diaphragm, due to the local thickening design of the diaphragm, the strength of the diaphragm is strengthened, the polarization problem of the diaphragm is solved, and the performance is better balanced on the premise of solving polarization. The non-linear degree of the stiffness curve of the diaphragm is reduced, the symmetry of the up and down amplitudes of the diaphragm when the vibration system works is improved, the distortion phenomenon of the sound generating device is improved, and the acoustic performance of the sound generating device is effectively improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The following drawings are only intended to illustrate and explain the present utility model schematically and do not limit the scope of the present utility model. Among them:

[0027] Figure 1 is a schematic structural diagram of the diaphragm of the embodiment of the present utility model;

[0028] Figure 2 is a cross-sectional view of the embodiment of the present utility model with the short side thickened;

[0029] Figure 3 is a cross-sectional view of the embodiment of the present utility model without the short side thickened;

[0030] Figure 4 is a cross-sectional view of the embodiment of the present utility model with the short side thickened and adopting a layered structure;

[0031] Figure 5 is a cross-sectional view of the embodiment of the present utility model with the outer arc section thickened and the inner arc section and the top arc section not thickened;

[0032] Figure 6It is a cross-sectional view of the outer arc section and the inner arc section thickened and the top arc section not thickened in the embodiment of the present utility model;

[0033] Figure 7 It is a color map of the rocking displacement distribution of the diaphragm in the second-order mode;

[0034] Figure 8 It is a color map of the rocking displacement distribution of the diaphragm in the third-order mode;

[0035] Figure 9 It is a five-point amplitude curve graph of the equal-thickness diaphragm design in the prior art;

[0036] Figure 10 It is a five-point amplitude curve graph of the embodiment of the present utility model;

[0037] Figure 11 It is a comparison graph of the frequency response curves of the present utility model.

[0038] In the figure: 11 - vibration part; 12 - surround part; 121 - long side; 122 - short side; 123 - corner; 13 - outer edge part; 21 - short side base layer; 22 - short side thickened layer; 31 - inner arc section; 32 - outer arc section; 33 - top arc section. Detailed implementation manners

[0039] The present utility model will be further described below in conjunction with the accompanying drawings and embodiments. In the following detailed description, only some exemplary embodiments of the present utility model are described by way of illustration. It is understood that those of ordinary skill in the art can recognize that various modifications can be made to the described embodiments without departing from the spirit and scope of the present utility model. Therefore, the accompanying drawings and the description are illustrative in nature and are not intended to limit the scope of protection of the claims.

[0040] As Figures 1 to 11 shown, a diaphragm includes a vibration part 11, a surround part 12 disposed around the outer periphery of the vibration part 11, and an outer edge part 13 disposed around the outer periphery of the surround part 12. The surround part 12 has a rectangular structure with corners. The surround part 12 includes two long sides 121, two short sides 122, and corners 123 connecting adjacent long sides 121 and short sides 122. The long side 121 is a thick side and the short side 122 is a thin side, or the short side 122 is a thick side and the long side 121 is a thin side. The thickness of the corner 123 and the thickness of the thick side are both greater than the thickness of the thin side.

[0041] In the present utility model, the thickness of the corner 123 can be greater than the thickness of the thick side, or less than the thickness of the thick side. For the convenience of processing, the thickness of the corner 123 can be equal to the thickness of the thick side. The present utility model does not make any limitation in this regard.

[0042] The long side 121 is the thick side and the short side 122 is the thin side (as Figure 3 ) or the long side 121 is the thin side and the short side 122 is the thick side (as Figure 2 ). Those skilled in the art can flexibly design according to the product requirements.

[0043] As Figure 4 shown, in one embodiment, the corner 123 and the thick side (taking the short side 122 as an example) are composite layers. The corner 123 includes a corner base layer and a corner thickening layer composite on the corner base layer. The thick side (short side 122) includes a thick side base layer (short side base layer 21) and a thick side thickening layer (short side thickening layer 22) composite on the thick side base layer (short side base layer 21). By adopting the composite layer, the material layer can be flexibly designed.

[0044] In one embodiment, the thickness of the corner thickening layer is greater than or equal to the thickness of the short side thickening layer 22, and its thickness relationship can be changed according to the performance requirements.

[0045] In one embodiment, the corner base layer, the thick side base layer and the thin side are of an integral structure and have the same thickness, which is convenient for molding. On this basis, thickening layers are added on the corner base layer and the thick side base layer.

[0046] In one embodiment, the corner 123 and the thick side are made of the same material. The thick side and the thin side are made of the same material; or, the thick side and the thin side are made of different materials; or, the hardness of the thick side is different from the hardness of the thin side.

[0047] In the present utility model, the materials of the corner 123, the thick side and the thin side include Peek, TPU, TPEE or rubber.

[0048] In one embodiment, the radial section of the surround 12 includes an inner arc section 31 connected to the vibrating part 11, an outer arc section 32 connected to the outer edge part 13, and a top arc section 33 connecting the inner arc section 31 and the outer arc section 32; the thickness of the outer arc section 32 is not less than the thickness of the top arc section 33, that is, as Figure 5 shown, the thickness of the outer arc section 32 can be greater than the thickness of the top arc section 33, or, as Figure 6 shown, the thickness of the outer arc section 32 is equal to the thickness of the top arc section 33.

[0049] In one embodiment, the thickness of the outer arc section 32 is greater than the thickness of the inner arc section 31, and the thickness of the top arc section 33 is not less than the thickness of the inner arc section 31, that is, the thickness of the top arc section 33 is greater than or equal to the thickness of the inner arc section 31.

[0050] In one embodiment, the thickness of the outer arc section 32 is greater than the thickness of the inner arc section 31, or, the thickness of the top arc section 33 is not less than the thickness of the inner arc section 31, that is, the thickness of the top arc section 33 is greater than or equal to the thickness of the inner arc section 31.

[0051] As Figure 9 and Figure 10 shown, the amplitude curve graph of five sampling points is shown in the figure, Figure 9 which is of the prior art, Figure 10 and which is of the technical solution described in the present application. By comparison, it can be seen that the vibration effect of the diaphragm is better. Figure 11 The frequency response curve graph is given. The red line in the figure is the frequency response curve of the prior art, and the black line in the figure is the frequency response curve of the technical solution described in the present application.

[0052] Combined with the above embodiments and Figure 9 、 Figure 10 、 Figure 11 the experimental data shown, the technical features and beneficial effects of the technical solution of the present application are described below:

[0053] 1. According to the rocking mode (second-order mode or third-order mode) of the speaker diaphragm, the present technical solution conducts a targeted design of locally thickening the thickness of the folded edge portion 12 of the diaphragm. On the one hand, it strengthens the strength of the diaphragm and solves polarization, and on the other hand, it does not cause the modulus to rise too high and the mass to increase too much due to overall thickening of the diaphragm. Therefore, compared with the current industry solutions, it can better balance the performance while solving polarization.

[0054] 2. The diaphragm described in the present application includes two technical directions: one is to increase the thickness of the four arc-shaped corners 123 of the folded edge portion 12 of the diaphragm and the thickness of the two short sides 122 alone; the other is to increase the thickness of the four arc-shaped corners 123 of the folded edge portion 12 of the diaphragm and the thickness of the two long sides 121 alone. For each direction, the radial thickness of the folded edge portion 12 can also be set in the form of being thicker on the outside and thinner on the inside. Specifically, it is radially divided into an outer arc section 32, a top arc section 33, and an inner arc section 31, and the thickness of the outer arc section 32 is greater than the thickness of the inner arc section 31.

[0055] When second-order polarization occurs, the diaphragm of the speaker will swing around the central axis of the short side 122 of the folded edge portion 12. The central axis of the short side 122 is located in the middle of the two short sides 122 and is parallel to the short side 122. In this case, the four arc-shaped corners 123 and the two short sides 122 of the speaker diaphragm are the positions with the largest displacement and the largest stress. At this time, local thickening is carried out at the four arc-shaped corners 123 and the short side 122 of the diaphragm folded edge portion 12, and the thickness is different from that of the long side 121. This can effectively increase the strength of these thickened areas and thus improve the polarization state of the product. As Figure 7 shown, the displacement of the four corners 123 and the short side 122 is larger, and the displacement in the middle of the long side 121 is smaller; Figure 7 in which red and yellow indicate larger displacement, and blue indicates smaller displacement.

[0056] When third-order polarization occurs, the diaphragm of the speaker will swing around the central axis of the long side 121 of the surround 12. The central axis of the long side 121 is located in the middle of the two long sides 121 and is parallel to the long side 121. In this case, the four arc-shaped corners 123 of the speaker diaphragm and the two long sides 121 are the positions with the largest displacement and the largest stress. At this time, the four arc-shaped corners 123 and the long sides 121 of the surround 12 of the diaphragm are locally thickened, and the thickness is different from that of the short side 122. This can effectively increase the strength of these thickened areas and thus improve the polarization state of the product. As Figure 8 shown, the displacement of the four corners 123 and the long sides 121 is larger, and the displacement in the middle of the short side 122 is smaller. Figure 8 In , red and yellow indicate larger displacement, and blue indicates smaller displacement.

[0057] 3. In addition to improving the polarization state, this design of locally unequal thickness increases the Young's modulus of the diaphragm. During the reciprocating vibration of the diaphragm, it can effectively suppress the excessive longitudinal deformation of the local area of the diaphragm, reduce the non-linearity degree of the stiffness curve of the diaphragm, improve the symmetry of the up and down amplitudes of the diaphragm when the speaker vibration system works, improve the distortion phenomenon of the micro speaker, and effectively improve the acoustic performance of the micro speaker.

[0058] 4. This design of local thickening can be such that the thickened layer and the original equal-thickness layer are of the same material, or the thickened layer and the equal-thickness layer are of different materials. It can also be that the thickened layer and the equal-thickness layer are of the same type of material with different hardnesses (for example, both are rubber materials, with different hardnesses, the hardness of the equal-thickness layer is 65A, and the hardness of the thickened layer is 70A) or of the same type of material with different moduli.

[0059] 5. The materials of the thickened layer and the equal-thickness layer include one or more of high molecular materials such as Peek, TPU, TPEE, and rubber materials.

[0060] 6. The thickened layer and the equal-thickness layer can be single-layer materials or multi-layer composite materials. The multi-layer composite materials can be different types of high molecular materials, or different types of high molecular materials + film adhesives (acrylic or silicone) + different types of high molecular materials.

[0061] The present utility model also discloses a sound generating device, which includes a vibration system and a magnetic circuit system for driving the vibration system to vibrate and generate sound. The vibration system includes the diaphragm described above.

[0062] Due to the local thickening design of the diaphragm, the strength of the diaphragm is enhanced, the polarization problem of the diaphragm is solved, and the performance is better balanced on the premise of solving polarization. The non-linear degree of the stiffness curve of the diaphragm is reduced, the symmetry of the up and down amplitudes of the diaphragm during the operation of the vibration system is improved, the distortion phenomenon of the sound generating device is improved, and the acoustic performance of the sound generating device is effectively improved.

[0063] The above shows and describes the basic principles, main features and advantages of the present utility model. Those skilled in the art should understand that the present utility model is not limited by the above embodiments. The above embodiments and the descriptions in the specification only illustrate the principles of the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents.

Claims

1. A diaphragm, comprising a vibrating portion, a surround portion annularly disposed on the outer periphery of the vibrating portion, and an outer edge portion annularly disposed on the outer periphery of the surround portion, wherein: The surround portion has a rectangular structure with corners, and the surround portion includes two long sides, two short sides, and corners connecting adjacent long sides and short sides. The long sides are thick sides, and the short sides are thin sides, or the short sides are thick sides and the long sides are thin sides; The thickness of the corners and the thickness of the thick sides are both greater than the thickness of the thin sides.

2. The diaphragm according to claim 1, characterized in that: The thickness of the corners is equal to the thickness of the thick sides.

3. The diaphragm according to claim 1, wherein: The corners include a corner base layer and a corner thickening layer compounded on the corner base layer, and the thick sides include a thick side base layer and a thick side thickening layer compounded on the thick side base layer.

4. The diaphragm according to claim 3, wherein: The thickness of the corner thickening layer is greater than or equal to the thickness of the short side thickening layer.

5. The diaphragm according to claim 3, characterized in that: The corner base layer, the thick side base layer, and the thin side are of an integral structure and have the same thickness.

6. The diaphragm according to claim 1 or 2, characterized in that: The corners and the thick sides are made of the same material.

7. The diaphragm according to claim 6, characterized in that: The thick sides and the thin sides are made of the same material; or, the thick sides and the thin sides are made of different materials; or, the hardness of the thick sides is different from the hardness of the thin sides.

8. The diaphragm according to claim 1, wherein: The materials of the corners, the thick sides, and the thin sides include Peek, TPU, TPEE, or rubber.

9. The diaphragm according to claim 1, wherein: The radial section of the surround portion includes an inner arc section connected to the vibrating portion, an outer arc section connected to the outer edge portion, and a top arc section connecting the inner arc section and the outer arc section; The thickness of the outer arc section is not less than the thickness of the top arc section; the thickness of the outer arc section is greater than the thickness of the inner arc section, and / or, the thickness of the top arc section is not less than the thickness of the inner arc section.

10. A sound generating device, comprising a vibration system and a magnetic circuit system for driving the vibration system to vibrate and generate sound, characterized in that: The vibration system includes a diaphragm according to any one of claims 1-9.

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