Diaphragm and sound generating device

Abstract

The present invention discloses a diaphragm and a sound-generating device, wherein the diaphragm includes a diaphragm body and a vibration plate, the diaphragm body includes a central portion, a folding ring portion and an edge portion connected in sequence; the diaphragm body is formed by a solid rubber material through a hot pressing process and is combined with the vibration plate. The technical solution of the present invention can improve the combination stability between the diaphragm and the vibration plate.

Description

[0001] This application claims the priority of the Chinese patent application filed with the China Patent Office on November 29, 2019, with application number 201911197999.2 and invention name “Sound Generator and Electronic Product”, some of its contents are incorporated in this application. Technical Field

[0002] The present invention relates to the technical field of sound energy conversion, and in particular to a diaphragm and a sound-generating device. Background Art

[0003] Currently, glue is mainly used to bond the diaphragm and the vibration plate. During reliability tests, the diaphragm and the vibration plate often crack due to insufficient bonding force, glue failure, or water pressure. Summary of the invention

[0004] The main purpose of the present invention is to provide a diaphragm, aiming to improve the bonding stability between the diaphragm and the vibration plate.

[0005] To achieve the above object, the present invention provides a diaphragm, the diaphragm comprising a diaphragm body and a vibration plate, the diaphragm body comprising a central portion, a folding ring portion and an edge portion connected in sequence;

[0006] The diaphragm body is formed by a solid rubber material through a hot pressing process and is combined with the vibration plate.

[0007] Optionally, the central portion covers a side surface of the vibration plate, and the central portion covers at least one of an upper surface and a lower surface of the vibration plate.

[0008] Optionally, the central portion includes a first portion covering an upper surface of the vibration plate, and a second portion covering a lower surface of the vibration plate.

[0009] Optionally, an area of ​​the first portion is greater than an area of ​​the second portion.

[0010] Optionally, the first portion covers the entire upper surface of the vibration plate, and the second portion covers an edge portion of the lower surface of the vibration plate.

[0011] Optionally, the rubber material is one of silicone rubber, AEM rubber or ACM rubber.

[0012] The present invention also provides a sound-generating device, comprising a shell and a diaphragm.

[0013] Optionally, the diaphragm body is formed by a solid rubber material through a hot pressing process and is combined with the vibration plate and the shell.

[0014] Optionally, the steps of forming the diaphragm body part with a solid rubber material through a hot pressing process and combining it with the vibration plate and the housing include:

[0015] Step S10: mixing the solid rubber raw material and the vulcanizing agent, and then mixing them in a rubber mixer;

[0016] Step S20: cutting the mixed solid rubber raw material into rubber materials of a set size;

[0017] Step S30: placing the vibration plate and the shell as inserts into a hot pressing mold, further placing a rubber compound into the hot pressing mold, hot pressing the rubber compound into shape and respectively connecting the rubber compound to the vibration plate and the shell to form a vibration membrane.

[0018] Optionally, the shell is provided with a boss, and the edge portion wraps around the boss.

[0019] The vibration plate of the present invention is combined with the central part by hot pressing, which is similar to the integral molding of the vibration plate and the central part, eliminating the gluing and bonding process between the central part and the vibration plate. The bonding force between the central part and the vibration plate is stronger, which can prevent the risk of cracking of the central part and the vibration plate of the sound-generating device during reliability testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0021] Figure 1 It is a partial structural exploded schematic diagram of an embodiment of a sound-generating device of the present invention;

[0022] Figure 2 for Figure 1 A schematic cross-sectional view of a portion of the structure of the sound generating device;

[0023] Figure 3 It is a cross-sectional schematic diagram of a part of the structure of another embodiment of the sound-generating device of the present invention;

[0024] Figure 4 for Figure 3 Enlarged view of point A in the middle.

[0025] Description of Figure Numbers:

[0026]

[0027]

[0028] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0031] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0032] The present invention provides a diaphragm and a sound-generating device, which can be used in devices capable of generating sound, such as earphones and mobile phones.

[0033] Please refer to Figure 1 and Figure 2 The sound-generating device includes a shell 10 and a vibration system installed in the shell 10, wherein the vibration system includes a diaphragm 20, wherein the diaphragm 20 includes a diaphragm body, wherein the diaphragm body has a central portion 21, a folding ring portion 22 and an edge portion 23 connected in sequence, and wherein the edge portion 23 is connected to the shell 10. Specifically, the folding ring portion 22 is arranged around the periphery of the central portion 21, and the edge portion 23 is arranged around the periphery of the folding ring portion 22. The folding ring portion 22 can be bent relative to the central portion 21 in a direction close to the magnetic circuit system of the sound-generating device, that is, the folding ring portion 22 is recessed downward to prevent the folding ring portion 22 from protruding from the top surface of the shell 10.

[0034] In addition, the diaphragm 20 also includes a vibration plate 24, and the diaphragm body is formed by a solid rubber material through a hot pressing process and is combined with the vibration plate 24. That is, the diaphragm body itself is formed by hot pressing of a solid rubber material, and can be combined with the vibration plate 24 during the molding process of the diaphragm body, thereby realizing the connection between the diaphragm body and the vibration plate 24.

[0035] When the center part 21 and the vibration plate 24 are assembled, they are often required to be sealed with additional sealant. The vibration plate 24 of the present invention is combined with the center part 21 by hot pressing, which is similar to the integral molding of the vibration plate 24 and the center part 21. The gluing and bonding process between the center part 21 and the vibration plate 24 is omitted, and the bonding force between the center part 21 and the vibration plate 24 is stronger, which can prevent the risk of cracking of the center part 21 and the vibration plate 24 in the reliability test of the sound-generating device.

[0036] Please refer to Figure 3 and Figure 4 In one embodiment, the central portion 21 covers the side surface of the vibration plate 24, and the central portion 21 covers at least one of the upper surface and the lower surface of the vibration plate 24. In this embodiment, the upper surface of the vibration plate 24 refers to the surface facing away from the magnetic circuit system, the lower surface of the vibration plate 24 refers to the surface facing the magnetic circuit system, and the side surface of the vibration plate 24 refers to the surface extending along the circumference of the diaphragm body. The central portion 21 can be covered on the upper surface or the lower surface of the vibration plate 24, or both the upper surface and the lower surface of the vibration plate 24 are wrapped by the central portion 21.

[0037] Specifically, in one embodiment, the central portion 21 includes a first portion 211 covering the upper surface of the vibration plate 24, and a second portion 212 covering the lower surface of the vibration plate 24. Among them, the first portion 211 can be a hollow structure, so that a part of the upper surface of the vibration plate 24 is exposed to the outside. Of course, the first portion 211 can also be a non-hollow structure, so that the upper surface of the vibration plate 24 is completely covered. Similarly, the second portion 212 can also be hollow, so that a part of the lower surface of the vibration plate 24 is exposed to the outside. Of course, the second portion 212 can also be a non-hollow structure. In this embodiment, the first portion 211 and the second portion 212 are similar to form a cavity structure, and the vibration plate 24 is placed in the cavity structure. The first portion 211 and the second portion 212 work together to limit the vibration plate 24 well and prevent the vibration plate 24 from being separated from the diaphragm body.

[0038] In one embodiment, the area of ​​the first portion 211 is larger than the area of ​​the second portion 212. Thus, the binding force between the upper surface of the vibration plate 24 and the first portion 211 is strong, which can prevent the vibration plate 24 from detaching upward. The lower surface of the vibration plate 24 is supported by the second portion 212, which can prevent the vibration plate 24 from falling downward.

[0039] In one embodiment, the first part 211 covers the entire upper surface of the vibration plate 24, and the second part 212 covers the edge portion of the lower surface of the vibration plate 24. Among them, the second part 212 can be generally annular, covering the entire edge portion of the vibration plate 24. Of course, multiple second parts 212 can also be provided, and the multiple second parts 212 are distributed at intervals along the circumference of the vibration plate 24. In this embodiment, the second part 212 can also be in the shape of a long strip. In this embodiment, the first part 211, the second part 212 and the central part that wraps the side of the vibration plate 24 together form a groove-like structure, wherein the first part 211 prevents the upper surface of the vibration plate 24 from being exposed, and the bonding force between the first part 211 and the vibration plate 24 is strong, and the second part 212 limits the vibration plate 24 to prevent the vibration plate 24 from detaching downward. In this embodiment, after the second part 212 is provided, it is equivalent to increasing the rubber-wrapped area, further increasing the bonding force between the central part 21 and the vibration plate 24.

[0040] Please refer to it again Figure 1 In one embodiment, the central portion 21 is rectangular, and it can be imagined that the entire diaphragm 20 is rectangular. In this embodiment, the vibration plate 24 is rectangular, and the vibration plate 24 has a long axis section 241 and a short axis section 242, the long axis section 241 corresponds to the long side of the central portion 21, and the short axis section 242 corresponds to the short side of the central portion 21; the second portion 212 is arranged corresponding to the short axis section 242. Here, the second portion 212 corresponds to the short axis section 242, which means that the second portion 212 is arranged on the side where the short axis section 242 is located, and abuts against the edge of the short axis section 242. In this embodiment, the second portion 212 arranged on the short axis section 242 is relatively shorter than that arranged on the long axis section 241, so during hot pressing, it is beneficial to the effect of the hot pressing mold and can reduce the difficulty of mold processing. On the other hand, the second part 212 can be set on both short axis segments 242 to limit the two ends of the vibration plate 24 to prevent the vibration plate 24 from falling. Compared with setting the second part 212 on the long axis segment 241, the material of the second part 212 can be saved.

[0041] In one embodiment, the second portion 212 extends along the short shaft segment 242 and covers the edge of the short shaft segment 242, which is equivalent to the entire short shaft segment 242 being abutted by the second portion 212, which can achieve a better limiting effect. Of course, in other embodiments, multiple second portions 212 can also be provided on the short shaft segment 242, and the multiple second portions 212 are spaced apart from each other.

[0042] In one embodiment, the long axis segment 241 and the short axis segment 242 are connected by an arc segment 243, and the second portion 212 extends to the connection between the arc segment 243 and the long axis segment 241. After such arrangement, the second portion 212 abuts against and limits the entire short axis segment 242 and the arc segment 243, and the rubber-encapsulated area is larger.

[0043] In one embodiment, the diaphragm body is formed by a solid rubber material through a hot pressing process and is combined with the vibration plate 24 and the housing 10. Of course, in addition to the hot pressing method, the edge portion 23 and the housing 10 can also be bonded.

[0044] When the diaphragm 20 is assembled with the housing 10, it is usually necessary to apply additional sealant for sealing. However, the diaphragm 20 of the present invention covers the housing 10 by hot pressing, and no other technical means are required to ensure the sealing between the diaphragm 20 and the housing 10, so that a good waterproof effect can be achieved, the sealing between the diaphragm 20 and the housing 10 is improved, the waterproof performance of the sound-generating device is improved, and water ingress into the sound-generating device is prevented. At the same time, the assembly efficiency of the diaphragm 20 and the housing 10 is improved.

[0045] According to one embodiment of the present invention, the diaphragm 20 is formed on the inner surface of the shell 10; or, the diaphragm 20 is formed on the top surface of the shell 10. Taking the case where the diaphragm 20 is formed on the inner surface of the shell 10 as an example, the edge portion 23 is attached to the inner surface of the shell 10, which can prevent it from protruding from the top surface of the shell 10 and causing a larger overall thickness. In addition, the edge portion 23 can completely cover the inner surface of the shell 10. The complete coverage here means that the upper surface of the edge portion 23 is roughly flush with the top surface of the shell 10, and the lower surface of the edge portion 23 is roughly flush with the bottom surface of the shell 10.

[0046] In one embodiment, the edge portion 23 has a first extension portion 231 and a second extension portion 232, wherein the first extension portion 231 extends in a direction away from the magnetic circuit system, and the second extension portion 232 extends in a direction close to the magnetic circuit system; the first extension portion 231 and the second extension portion 232 are respectively heat-pressed and bonded to the inner surface of the housing 10. The folding ring portion 22 is connected to the first extension portion 231, and the folding ring portion 22 and the second extension portion 232 are spaced apart in a direction perpendicular to the vibration direction of the diaphragm 20. With such an arrangement, the edge portion 23 can be prevented from interfering with the vibration of the folding ring portion 22. In this embodiment, the first extension portion 231 can be staggered inwardly relative to the second extension portion 232, thereby achieving a spacing between the folding ring portion 22 and the second extension portion 232 in a direction perpendicular to the vibration direction.

[0047] By providing the first extension portion 231 and the second extension portion 232 , the contact area between the edge portion 23 and the housing 10 can be increased, and the sealing effect after hot pressing can be better.

[0048] In one embodiment, the shell 10 has a connection surface connected to the edge portion 23, the connection surface is uneven, and the edge portion 23 and the concave-convex structure on the connection surface are interlocked. It should be noted that in the embodiment where the edge portion 23 is combined with the inner surface of the shell 10, the connection surface refers to the inner surface. In this embodiment, the uneven connection surface means that, at least, a protrusion protruding inward or a groove recessed outward is formed on the connection surface, and the edge portion 23 wraps the protrusion or is embedded in the groove to form a mutually interlocking structure, which can be connected more tightly.

[0049] In one embodiment, a boss 11 is convexly provided on the connection surface of the shell 10, and the edge portion 23 wraps the boss 11. Specifically, a groove is formed on the edge portion 23, and the boss 11 is installed in the groove and tightly fits with the groove. The boss 11 extends in a ring shape along the circumference of the shell 10, so that the groove is also ring-shaped. In this embodiment, the diaphragm 20 completely covers the boss 11, thereby improving the bonding force between the diaphragm 20 and the shell 10, so that the diaphragm 20 will not easily fall off from the shell 10.

[0050] According to one embodiment of the present invention, the diaphragm body is made of a solid rubber material, and the rubber material is one of silicone rubber, AEM rubber or ACM rubber. The material of the diaphragm body is selected from one of silicone rubber, AEM rubber or ACM rubber. On the one hand, it improves the bonding force between the diaphragm 20 and the shell 10, ensuring the sealing of the sound-generating device. On the other hand, the diaphragm body adopts the above-mentioned material. Compared with the diaphragm 20 made of conventional polymer plastics, the rubber material of the present invention has a lower Young's modulus. The diaphragm 20 provided by the present invention has a wider elastic area and good flexibility. The vibration displacement of the diaphragm 20 is larger, the loudness is greater, and it is not easy to have reliability problems such as film breakage. When the diaphragm 20 is made into a sound-emitting device, the diaphragm 20 can effectively suppress polarization during vibration, improve the sound quality of the sound-emitting device, and reduce THD (total harmonic distortion); at the same time, the present invention can increase the width of the folded ring portion 22 of the diaphragm 20, increase the radiation area of ​​the sound-emitting device (the area that drives the diaphragm 20 to vibrate), and can provide a larger vibration stroke, reduce the stretching of the material itself during vibration, increase fatigue resistance, and ensure the reliability of the sound-emitting device.

[0051] According to an embodiment of the present invention, the steps of forming the diaphragm body with a solid rubber material through a hot pressing process and combining it with the vibration plate are as follows:

[0052] Step S10: mixing the solid rubber raw material and the vulcanizing agent, and then mixing them in a rubber mixer;

[0053] Step S20: cutting the mixed solid rubber raw material into rubber materials of a set size;

[0054] Step S30: placing the vibration plate as an insert into a hot pressing mold, further placing a rubber compound into the hot pressing mold, hot pressing the rubber compound into shape and connecting it to the vibration plate to form a vibration membrane.

[0055] The step of forming the diaphragm body with solid rubber material through a hot pressing process and combining it with the vibration plate 24 and the shell 10 requires, in step S30, placing the vibration plate 24 and the shell 10 as inserts into a hot pressing mold, further placing the rubber into the hot pressing mold, hot pressing the rubber into shape and connecting it to the vibration plate 24 and the shell 10 to form a diaphragm.

[0056] In step S10, the solid rubber raw material is mixed with a vulcanizing agent for kneading, and the vulcanizing agent is configured to be used for vulcanization of the solid rubber raw material, so that the vulcanized solid rubber raw material has more elasticity and the size and structure of the vulcanized solid rubber raw material are more stable.

[0057] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A diaphragm, characterized in that: The diaphragm includes a diaphragm body and a vibration plate, wherein the diaphragm body includes a central portion, a folding ring portion and an edge portion connected in sequence; The diaphragm body is formed by a solid rubber material through a hot pressing process and is combined with the vibration plate as an insert during the molding process of the diaphragm body; the central part covers the side of the vibration plate, and the central part covers a first part of the upper surface of the vibration plate and a second part of the lower surface of the vibration plate, the first part and the second part form a cavity structure for limiting the vibration plate, and the vibration plate is placed in the cavity structure; The edge portion has a first extension portion and a second extension portion, the first extension portion extends in a direction away from the magnetic circuit system, and the second extension portion extends in a direction close to the magnetic circuit system, the folding ring portion is connected to the first extension portion, and is spaced apart from the second extension portion in a direction perpendicular to the vibration direction of the diaphragm.

2. The diaphragm according to claim 1, characterized in that An area of ​​the first portion is greater than an area of ​​the second portion.

3. The diaphragm according to claim 1 or 2, characterized in that: The first portion covers the entire upper surface of the vibration plate, and the second portion covers an edge portion of the lower surface of the vibration plate.

4. The diaphragm according to claim 1, characterized in that The rubber material is one of silicone rubber, AEM rubber or ACM rubber.

5. A sound-generating device, characterized in that: It comprises a shell and a diaphragm as described in any one of claims 1 to 4.

6. The sound generating device according to claim 5, characterized in that: The diaphragm body is formed by a solid rubber material through a hot pressing process and is combined with the vibration plate and the shell.

7. The sound generating device according to claim 6, characterized in that: The steps of forming the diaphragm body with a solid rubber material by a hot pressing process and combining it with the vibration plate and the housing include: Step S10: mixing the solid rubber raw material and the vulcanizing agent, and then mixing them in a rubber mixer; Step S20: cutting the mixed solid rubber raw material into rubber materials of a set size; Step S30: placing the vibration plate and the shell as inserts into a hot pressing mold, further placing a rubber compound into the hot pressing mold, hot pressing the rubber compound into shape and respectively connecting the rubber compound to the vibration plate and the shell to form a vibration membrane.

8. The sound generating device according to claim 6, characterized in that: The shell body is provided with a boss, and the edge portion wraps the boss.

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