WO2021119994A1

WO2021119994A1 - Vibrating diaphragm and sound production device

Info

Publication number: WO2021119994A1
Application number: PCT/CN2019/125949
Authority: WO
Inventors: 肖波; 令狐荣林
Original assignee: 瑞声声学科技(深圳)有限公司; 瑞声科技(新加坡)有限公司
Priority date: 2019-12-17
Filing date: 2019-12-17
Publication date: 2021-06-24

Abstract

Disclosed in the utility model is a vibrating diaphragm, comprising a middle part, a folding ring part arranged on the outer side of the middle part in a surrounding manner, and a fixing part arranged on the outer side of the folding ring part in a surrounding manner. The folding ring part is of a rectangular structure, and comprises two first edges, which are arranged parallel to the direction of a long axis thereof, two second edges, which are arranged parallel to the direction of a short axis thereof, a corner part, by means of which an adjacent first edge and second edge are connected, and a reinforcing layer, which is arranged on the corner part, wherein the reinforcing layer is respectively attached to a surface of each of the four corner parts and forms a composite fillet with the respective corner part, and the thickness of the composite fillet is greater than the thickness of the first edge and the thickness of the second edge. Compared with related technology, in the vibrating diaphragm and the sound production device of the present utility model, the vibrating diaphragm is improved in terms of anti-swing rigidity.

Description

Diaphragm and sound device

Technical field

The utility model relates to the field of electro-acoustic conversion, in particular to a vibrating membrane and a sound generating device used in portable electronic products.

Background technique

With the advent of the mobile Internet era, the number of smart mobile devices continues to rise. Among many mobile devices, mobile phones are undoubtedly the most common and most portable mobile terminal devices. At present, mobile phones have extremely diverse functions, one of which is high-quality music functions. Therefore, sound-generating devices for playing sounds are widely used in current smart mobile devices.

The related art sound device includes a basin frame, a vibration system fixed to the basin frame, and a magnetic circuit system with a magnetic gap; the vibration system includes a diaphragm fixed to the basin frame and a diaphragm inserted in the frame. The magnetic gap is used to drive the voice coil of the diaphragm to vibrate and produce sound. The magnetic circuit system includes a magnetic yoke connected to the basin frame, a main magnetic steel and an auxiliary magnetic steel fixed to the magnetic yoke, the main magnetic steel and the auxiliary magnetic steel are spaced apart and jointly form the magnetic gap. The vibrating membrane includes a vibrating part having a flat plate structure and a folding ring part extending from the periphery of the vibrating part and surrounding the vibrating part.

technical problem

However, for the sound device in the related art, all positions of the diaphragm after molding have the same thickness. For some products, the diaphragm with the same thickness of each part requires different structural strengths at different positions, which cannot satisfy the requirements. The rigidity required by the actual product at a specific location makes the vibration system sway more violently, causing poor performance.

Therefore, it is necessary to provide a new diaphragm and sounding device to solve the above technical problems.

Technical solutions

The purpose of the utility model is to overcome the above technical problems and provide a vibration film and sounding device with anti-swing stiffness.

In order to achieve the above objective, the present invention provides a diaphragm including a middle part, a folding ring part arranged around the outside of the middle part, and a fixing part arranged around the outside of the folding ring part, the folding ring part has a rectangular structure, so The folded ring portion includes two first sides arranged parallel to the long axis direction, two second sides arranged parallel to the short axis direction, and a corner connecting the adjacent first side and the second side Portion and a reinforcing layer provided on the corner portion, the reinforcing layer is respectively attached to the surface of the four corner portions, and forms a compound fillet with the corner portion, and the thickness of the compound fillet is greater than the thickness of the compound fillet. The thickness of the first side and the thickness of the second side.

Preferably, the thickness of the compound fillet is equal from the end connecting the first side to the end connecting the second side.

Preferably, the thickness of the compound fillet gradually increases.

Preferably, the thickness of the compound fillet gradually increases or decreases from the end connected to the first side to the end connected to the second side.

Preferably, the thickness of the compound fillet gradually increases or decreases from the middle of the compound fillet to the two ends of the compound fillet connecting the first side and the second side.

Preferably, the thickness of the first side is equal to the thickness of the second side.

Preferably, the rigidity of the composite layer is greater than the rigidity of the rounded corners.

Preferably, the elasticity of the reinforcing layer is greater than the elasticity of the corner portion.

Preferably, the diaphragm further includes a dome, a middle part of the diaphragm is provided with a through hole penetrating the middle part, and the dome is attached to the middle part and completely covers the through hole.

The utility model also provides a sound-producing device. The utility model also provides a sound-producing device, including a basin frame, a vibration system fixed to the basin frame, and a magnetic circuit system that drives the vibration system to vibrate and produce sound. The vibration system includes The above-mentioned diaphragm provided by the present invention.

Beneficial effect

Compared with the prior art, in the diaphragm and the sound generating device using the diaphragm of the present invention, the reinforcing layer is attached to the surfaces of the four corners respectively, and forms four joints with the corners. In the compound rounded corners, the stiffness of the reinforcement layer is greater than the stiffness of the corner portion, and the elasticity of the reinforcement layer is greater than the elasticity of the corner portion; on the one hand, the overall weight increase of the diaphragm is small to ensure On the other hand, the rigidity of the composite fillet is relatively large, which avoids the vibration of the diaphragm and improves the structural strength and anti-sway stiffness of the diaphragm, thereby effectively improving the diaphragm And the acoustic performance of the sound device using the diaphragm, and the reliability is better, and the minimum sound diaphragm quality cost is used to control the swing of the vibration system.

Description of the drawings

In order to more clearly explain the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings needed in the description of the embodiments. Obviously, the drawings in the following description are only some implementations of the present utility model. For example, for those of ordinary skill in the art, without creative work, other drawings can be obtained based on these drawings, among which:

Figure 1 is a schematic diagram of the three-dimensional structure of the sound generating device of the present invention;

Figure 2 is an exploded schematic diagram of the three-dimensional structure of the sound generating device of the present invention;

Figure 3 is an exploded schematic diagram of the three-dimensional structure of the diaphragm of the present invention;

Figure 4 is an exploded schematic view of a part of the three-dimensional structure of the diaphragm of the present invention.

Embodiments of the present invention

The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, not all of them. Examples. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the scope of protection of the present utility model.

Please refer to FIGS. 1-2 at the same time. The present invention provides a sound generating device 100, which includes a basin frame 10, a vibration system 20 respectively fixed to the basin frame 10, and a magnetic circuit system 30 that drives the vibration system 20 to vibrate and produce sound.

Specifically, the vibration system 30 includes a diaphragm 2 and a voice coil 3 that drives the diaphragm 2 to vibrate and produce sound; The yoke 4, the main magnet 5 fixedly arranged on the yoke 4, the auxiliary magnet 6 arranged on the peripheral side of the main magnet 5 and spaced from the main magnet 5 to form a magnetic gap, and a cover On the pole core 7 on the main magnet 5, the voice coil 3 is inserted into the magnetic gap.

Please also refer to Figures 3-4. Figure 3 is a schematic diagram of the three-dimensional structure of the diaphragm of the present invention; Figure 4 is an exploded schematic diagram of a part of the three-dimensional structure of the diaphragm of the present invention. The diaphragm 2 includes a middle part 21, a folding ring part 22 arranged around the outside of the middle part 21, and a fixing part 23 arranged around the outside of the folding ring part 22.

Specifically, the middle portion 21 is provided with a through hole 211 penetrating therethrough; the diaphragm 2 further includes a dome 24, which is attached to the middle portion 21 and completely covers the through hole 211 .

In this embodiment, the dome 24 is attached to the middle portion 21 to improve the high-frequency acoustic performance of the vibration of the diaphragm 2. Of course, the dome 3 can also be omitted, which is also feasible.

The folding ring portion 22 is bent and extended from the periphery of the middle portion 21 and is arranged around the middle portion 21 to provide support and restoring force when the middle portion 21 vibrates, and to improve the vibration of the middle portion 21 Strength and range.

Specifically, the cross-section of the folding ring portion 22 is arc-shaped, the folding ring portion 22 is a rectangular structure, and the folding ring portion 22 includes two first sides 221 arranged parallel to its long axis direction, parallel to The two second sides 222 arranged in the short axis direction, the corner portion 2231 connecting the adjacent first side 221 and the second side 222, and the reinforcing layer 2232 disposed on the corner portion, the reinforcing layer 2232 Are respectively attached to the surfaces of the four corner portions 2231, and form a compound round corner 223 with the corner portion 2231, the thickness of the compound round corner 223 is greater than the thickness of the first side 221 and the second side 222 thickness.

More preferably, as an optional implementation manner, the increasing method of the thickness of the compound fillet 223 can be uniformly increased. According to the actual performance of the diaphragm 2 in the application test, the reinforcing layer 2232 can also be included in any of them. The thickness of a weak position continues to increase, so that the thickness of the compound rounded corner 223 gradually increases, which further improves the enhancement layer 2232 on the sound effect of the diaphragm. As another optional implementation manner, the compound circle The thickness of the corner 223 gradually increases or decreases from the end connected to the first side 221 to the end connected to the second side 222; the thickness of the composite rounded corner 223 is determined by the composite rounded corner 223 The middle of, respectively, gradually increases or decreases toward the two ends to which the first side 221 and the second side 222 are connected.

The thickness of the first side 221 and the thickness of the second side 222 may be the same or different, but both are smaller than the thickness of the compound fillet 223. In this embodiment, the thickness of the first side 221 is equal to the thickness of the second side 222.

In this embodiment, the reinforcing layer 2232 is attached to the surfaces of the four corner portions 2231 respectively, and forms the four compound round corners 223 with the corner portions 2231, and the stiffness of the reinforcing layer 2232 is greater than The rigidity of the corner portion 2231 and the elasticity of the reinforcing layer 2232 are greater than the elasticity of the corner portion 2231; on the one hand, the overall weight increase of the diaphragm 2 is small, which ensures that its resonance frequency changes small; On the other hand, the composite fillet 223 has greater rigidity, which prevents the diaphragm 2 from being broken when it vibrates, improves the structural strength and the anti-sway rigidity of the diaphragm 2, thereby effectively improving the diaphragm 2 and the use of the vibration. The acoustic performance and reliability of the sound device of the membrane 2 are better, and the effect of controlling the swing of the vibration system can be achieved with the minimum sound membrane quality cost.

The above are only the embodiments of the utility model, and do not limit the patent scope of the utility model. Any equivalent structure or equivalent process transformation made by using the description and drawings of the utility model, or directly or indirectly applied to other Related technical fields are included in the scope of patent protection of the utility model in the same way.

Claims

A diaphragm, comprising a middle part, a folding ring part arranged around the outside of the middle part, and a fixing part arranged around the outside of the folding ring part, characterized in that the folding ring part has a rectangular structure, and the folding ring The portion includes two first sides arranged parallel to the direction of its long axis, two second sides arranged parallel to the direction of its short axis, a corner connecting the adjacent first and second sides, and A reinforcing layer on the corner portion, the reinforcing layer is respectively attached to the surface of the four corner portions, and forms a compound fillet with the corner portion, and the thickness of the compound fillet is greater than that of the first The thickness of the side and the thickness of the second side.
The diaphragm according to claim 1, wherein the thickness of the compound fillet is equal in the direction from the end connected to the first side to the end connected to the second side.
The diaphragm according to claim 1, wherein the thickness of the compound fillet gradually increases.
The diaphragm according to claim 3, wherein the thickness of the compound fillet gradually increases or decreases from the end connected to the first side to the end connected to the second side.
The diaphragm according to claim 3, wherein the thickness of the compound fillet gradually increases from the middle of the compound fillet to the two ends of the compound fillet connecting the first side and the second side. Or gradually decrease.
The diaphragm according to claim 1, wherein the thickness of the first side is equal to the thickness of the second side.
The diaphragm according to claim 1, wherein the rigidity of the reinforcing layer is greater than the rigidity of the corner portion.
The diaphragm according to claim 7, wherein the elasticity of the reinforcing layer is greater than the elasticity of the corner portion.
The diaphragm according to claim 1, wherein the diaphragm further comprises a dome, a middle part of the diaphragm is provided with a through hole penetrating the middle part, and the dome is attached to the The middle part completely covers the through hole.
A sounding device, comprising a basin frame, a vibration system fixed to the basin frame, and a magnetic circuit system for driving the vibration system to vibrate and produce sound, characterized in that the vibration system includes any one of claims 1-9 Of the diaphragm.