Vibrating diaphragm assembly

Abstract

The utility model provides a diaphragm assembly, which comprises a diaphragm, a first ball top and a second ball top, the first ball top and the second ball top are fixed on the diaphragm, and the diaphragm comprises an outer plane portion located on the outer side, an inner plane portion located on the inner side and a folding ring portion located between the outer plane portion and the inner plane portion. The first ball top and the second ball top are located on the two sides of the inner plane part respectively, a middle hole is formed in the middle of the inner plane part, and a hollow cavity is defined by the first ball top, the second ball top and the inner plane part. The first dome and the second dome are arranged on the two sides of the vibrating diaphragm respectively, the cavity with the hollow interior is defined by the first dome, the second dome and the inner plane part, resonance can be buffered when the two domes vibrate, the rigidity is higher, the high-frequency bandwidth expansion is better, the edge positions of the two domes are the positions with the maximum folding ring amplitude, and the structural design stability is higher.

Description

Technical Field

[0001] The utility model relates to the field of electronic products, in particular to a diaphragm component. Background Art

[0002] At present, the diaphragm components and dome materials of micro speaker products are mostly PEN, LCP, aluminum foil / PMI / aluminum foil, and the folding ring and the dome are combined together by single-sided bonding. As speakers have developed towards large amplitudes in recent years, the rigidity of the dome and the bonding strength with the folding ring have become increasingly higher. The traditional diaphragm assembly structure is prone to the problem of the dome falling off. If the dome is attached to the top of the diaphragm, it is easy to crack when vibrating downward. If the dome is attached to the bottom of the diaphragm, it is easy to crack when vibrating upward. The current solution in the industry is to strengthen the edge of the dome with secondary glue, but there is still a potential risk of cracking of the glue layer and the diaphragm. Utility Model Content

[0003] The purpose of the utility model is to overcome the shortcomings of the above-mentioned traditional technology and provide a diaphragm assembly.

[0004] The purpose of the utility model is achieved through the following technical measures: a diaphragm assembly, characterized in that it includes a diaphragm and a first spherical top and a second spherical top fixed on the diaphragm, the diaphragm includes an outer plane portion located on the outside, an inner plane portion located on the inside, and a folding ring portion located between the outer plane portion and the inner plane portion, the first spherical top and the second spherical top are respectively located on both sides of the inner plane portion, a middle part of the inner plane portion is provided with a center hole, and an internal hollow cavity is surrounded by the first spherical top, the second spherical top and the inner plane portion.

[0005] As a preferred solution, the first dome and the second dome are both adhered to the inner plane portion with adhesive backing, and at least one of the first dome and the second dome is with U-shaped adhesive backing.

[0006] As a preferred solution, the second dome is a U-shaped adhesive backing, and the thickness of the second dome corresponding to the inner plane is smaller than that corresponding to the middle hole, so that the second dome forms a second step at the intersection of the inner plane and the middle hole.

[0007] As a preferred solution, the height difference between the second spherical top and the corresponding part of the middle hole and the corresponding part of the inner plane is H1, the height of the middle hole is H2, the thickness of the back glue is H3, and H1<(H2+H3).

[0008] As a preferred solution, the first dome is a U-shaped adhesive backing, and the thickness of the first dome corresponding to the inner plane is smaller than that corresponding to the middle hole, so that the first dome forms a first step at the intersection of the inner plane and the middle hole.

[0009] As a preferred solution, the height difference between the first spherical top and the corresponding part of the middle hole and the corresponding part of the inner plane is H4, the height of the middle hole is H5, the thickness of the back glue is H6, and H4<(H5+H6).

[0010] As a preferred solution, the cavity area accounts for 30%-60% of the entire second spherical top area.

[0011] As a preferred solution, cross reinforcing ribs are provided in the middle portion of the cavity to divide the cavity structure into a plurality of small cavity structures.

[0012] As a preferred solution, the number of the small cavities is 2 to 9.

[0013] As a preferred solution, the total area of ​​the small cavities accounts for 20%-55% of the entire area of ​​the second spherical top.

[0014] Due to the adoption of the above technical scheme, compared with the prior art, the advantages of the utility model are as follows: by respectively arranging the first dome and the second dome on both sides of the diaphragm, an internal hollow cavity is formed between the first dome, the second dome and the inner plane portion, and the two domes can buffer the resonance when vibrating, the rigidity is stronger, and the high-frequency bandwidth is better expanded; when the diaphragm assembly vibrates upward, the second dome at the bottom supports it, and no edge cracking occurs; when it vibrates downward, the first dome at the top supports it, and no edge cracking occurs either; the edge positions of the two domes are the positions where the amplitude of the folded ring is maximum, and this structural design has higher stability.

[0015] The utility model is further described below in conjunction with the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Attached Figure 1 It is a structural schematic diagram of embodiment 1 of a diaphragm assembly of the utility model.

[0017] Attached Figure 2 The utility model is a diaphragm component Figure 1 Schematic diagram of the partially enlarged structure.

[0018] Attached Figure 3 The utility model is a schematic diagram of a diaphragm structure of a diaphragm assembly.

[0019] Attached Figure 4 This is a structural schematic diagram of Example 2 of a diaphragm assembly of the utility model.

[0020] Attached Figure 5 The utility model is a diaphragm component Figure 4 Schematic diagram of the partially enlarged structure.

[0021] Attached Figure 6 It is a schematic diagram of the small cavity structure of Example 3 of a diaphragm assembly of the utility model.

[0022] Attached Figure 7 It is a schematic cross-sectional structure diagram of embodiment 3 of a diaphragm assembly of the utility model. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] Embodiment 1: As attached Figure 1-3 As shown, a diaphragm assembly includes a diaphragm 3 and a first dome 1 and a second dome 2 fixed on the diaphragm 3. The diaphragm 3 includes an outer plane portion 4 located on the outside, an inner plane portion 5 located on the inside, and a folding ring portion 6 located between the outer plane portion 4 and the inner plane portion 5. The outer plane portion 4 is used to connect with a bracket, and the inner plane portion 5 is used to bond the first dome 1 and the second dome 2. The first dome 1 and the second dome 2 are respectively located on both sides of the inner plane portion 5. A middle hole 7 is provided in the middle of the inner plane portion 5, so that the inner plane portion 5 is in the shape of a Chinese character "Yu".

[0025] In this embodiment, the first dome 1 is located at the top and the second dome 2 is located at the bottom. The main material of the first dome 1 and the second dome 2 is one of PEN, LCP, Al / PMI / Al composite, hard aluminum and the like. The first dome 1 and the second dome 2 are both bonded to the inner plane portion 5 by a back adhesive, and the back adhesive is an acrylic pressure-sensitive adhesive or a UV adhesive.

[0026] like Figure 1-2 As shown, the first dome 1 can be full-surface adhesive or U-shaped adhesive. In this embodiment, the full-surface adhesive is used. If it is U-shaped adhesive, the adhesive width is not less than the width of the inner plane portion 5.

[0027] The second dome 2 is a back glue in the shape of a Chinese character "Yu". The thickness of the second dome 2 at the position corresponding to the inner plane 5 is less than that at the position corresponding to the middle hole 7, so that the second dome 2 forms a second step 8 at the intersection of the inner plane 5 and the middle hole 7. The back glue of the second dome 2 is arranged outside the second step 8, that is, it is only arranged at the position corresponding to the inner plane 5. The setting of the second step 8 makes it more convenient to adjust the middle position. The height difference between the second dome 2 corresponding to the middle hole 7 and the position corresponding to the inner plane 5 is H1, the height of the middle hole 7 is H2, and the thickness of the back glue is H3. In this embodiment, H1<(H2+H3).

[0028] An internal hollow cavity 9 is formed between the first dome 1, the second dome 2 and the inner plane portion 5. When the two domes vibrate, resonance can be buffered, rigidity is enhanced, and high-frequency bandwidth is better expanded.

[0029] In this embodiment, the area of ​​the cavity 9 accounts for 30%-60% of the area of ​​the entire second dome 2. In this embodiment, it is 50%. If the proportion is too large, the bonding area will be small and the strength will be reduced; if the proportion is too small, the cavity 9 will have little effect on high-frequency expansion. The first dome 1 and the second dome 2 have the same area.

[0030] When the diaphragm assembly vibrates upward, the second dome 2 at the bottom supports it, and no edge cracking occurs; when it vibrates downward, the first dome 1 at the top supports it, and no edge cracking occurs either; the edge positions of the two domes are the positions with the maximum amplitude of the folding ring, and this structural design has higher stability.

[0031] Example 2: Figure 4-5 As shown, in this embodiment, the first dome 1 is also a U-shaped adhesive backing, and the thickness of the first dome 1 at the position corresponding to the inner plane 5 is less than that at the position corresponding to the middle hole 7, so that the first dome 1 forms a first step 10 at the intersection of the inner plane 5 and the middle hole 7, and the adhesive backing of the first dome 1 is arranged outside the first step 10, that is, only arranged at the position corresponding to the inner plane 5. The setting of the first step 10 makes it more convenient to adjust the middle position. The height difference between the first dome 1 corresponding to the middle hole 7 and the position corresponding to the inner plane 5 is H4, the height of the middle hole 7 is H5, and the thickness of the adhesive backing is H6. In this embodiment, H4<(H5+H6).

[0032] The other parts of this embodiment are the same as those of Embodiment 1 and will not be described in detail.

[0033] Example 3: Figure 6-7 As shown, in this embodiment, a cross reinforcement rib 11 is provided in the middle part of the cavity 9, which divides the cavity 9 structure into a plurality of small cavity structures. The small cavity structure may be a square, diamond or other special-shaped structure. After being divided into a plurality of small cavities, the buffering effect on high-frequency vibration is better, the rigidity is stronger, and the high-frequency bandwidth expansion effect is better.

[0034] One side of the reinforcing rib 11 is bonded to the first dome 1 , and the other side is bonded to the second dome 2 , so as to prevent a large cavity 9 from causing asynchronous vibration between the first dome 1 and the second dome 2 .

[0035] The number of small cavities is 2 to 9. In the present embodiment, the number is 6. Too many small cavities will have a smaller impact on high frequency and increase the process cost.

[0036] The areas of the small cavities can be the same or different, and the total area of ​​the small cavities accounts for 20%-55% of the entire dome area.

[0037] The other parts of this embodiment are the same as those of Embodiment 2 and will not be described in detail.

Claims

1. A diaphragm assembly, characterized in that: The invention comprises a diaphragm and a first spherical dome and a second spherical dome fixed on the diaphragm, wherein the diaphragm comprises an outer plane portion located on the outside, an inner plane portion located on the inside, and a folded ring portion located between the outer plane portion and the inner plane portion, wherein the first spherical dome and the second spherical dome are respectively located on both sides of the inner plane portion, a central hole is provided in the middle portion of the inner plane portion, and an internal hollow cavity is enclosed by the first spherical dome, the second spherical dome and the inner plane portion.

2. A diaphragm assembly according to claim 1, characterized in that: The first dome and the second dome are both adhered to the inner plane with adhesive backing, and at least one of the first dome and the second dome is with U-shaped adhesive backing.

3. A diaphragm assembly according to claim 2, characterized in that: The second dome is a U-shaped adhesive backing, and the thickness of the second dome at the portion corresponding to the inner plane is smaller than that at the portion corresponding to the middle hole, so that the second dome forms a second step at the intersection of the inner plane and the middle hole.

4. A diaphragm assembly according to claim 3, characterized in that: The height difference between the second spherical top and the corresponding part of the middle hole and the corresponding part of the inner plane is H1, the height of the middle hole is H2, the thickness of the back glue is H3, and H1<(H2+H3).

5. A diaphragm assembly according to claim 4, characterized in that: The first dome is a U-shaped adhesive backing, and the thickness of the first dome at the position corresponding to the inner plane is smaller than that at the position corresponding to the middle hole, so that the first dome forms a first step at the intersection of the inner plane and the middle hole.

6. A diaphragm assembly according to claim 5, characterized in that: The height difference between the first spherical top and the corresponding part of the middle hole and the corresponding part of the inner plane is H4, the height of the middle hole is H5, the thickness of the back glue is H6, and H4<(H5+H6).

7. A diaphragm assembly according to any one of claims 1 to 6, characterized in that: The area of ​​the cavity accounts for 30%-60% of the entire area of ​​the second spherical top.

8. A diaphragm assembly according to any one of claims 1 to 6, characterized in that: The middle part of the cavity is provided with cross reinforcing ribs to divide the cavity structure into a plurality of small cavity structures.

9. A diaphragm assembly according to claim 8, characterized in that: The number of the small cavities is 2 to 9.

10. The diaphragm assembly according to claim 8, characterized in that: The total area of ​​the small cavities accounts for 20%-55% of the entire area of ​​the second spherical top.

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