Sound generating devices and electronic equipment

Abstract

The present invention discloses a sound-generating device including a shell, a vibration system and a front cover. The shell has an opening, the vibration system is arranged in the shell, the front cover is arranged on the opening of the shell and a sound outlet is arranged on the front cover. The front cover is arranged in two parts, namely a main body and a cover plate, and the sound outlet is arranged on the cover plate; the main body is made of metal material; the cover plate is made of plastic material, and the Young's modulus of the plastic material is greater than or equal to 2000MPa. The front cover made by combining metal material and plastic material not only ensures the necessary strength and heat dissipation effect of the front cover by utilizing the hardness and thermal conductivity of the metal material, but also solves the problem of easy deformation of the rib structure by utilizing the good resilience of the selected plastic material, and the overall structure is more stable; on the other hand, since the main body and the cover plate are made separately, the strength requirement of the metal material is low, and copper material can be selected to reduce the processing difficulty, simplify the production process of the components, and reduce the overall cost.

Description

Technical Field

[0001] The present invention relates to the technical field of electroacoustic conversion, and in particular to a sound-generating device and an electronic device. Background Art

[0002] With the rise of demand for mobile phone stereo, dual speaker design is becoming more and more popular, but the space in the thickness direction of the mobile phone, that is, the height direction of the sound device, is very tight. In order to save space in the height direction, the traditional front cover 4 is designed as follows Figure 1 and Figure 2 The shape shown has a low perimeter and a raised center area, with a dust screen 33 located on the raised area. During phone assembly, the low perimeter area is sealed against the phone's middle frame, while the raised center area fits into the phone's front cavity. This design of the front cover has the following problems:

[0003] 1. If the front cover is made of stainless steel, iron filings are easily generated during a drop. If it is made of copper, the middle cross rib 41 is weak and easily deformed during a drop. Furthermore, the metal cross rib 41 is also prone to deformation during the production process, causing noise.

[0004] 2. The metal cross ribs 41 are fitted to the structure of the dust screen 33 , resulting in a large overall thickness, occupying a large amount of space, and making inappropriate use of space. Summary of the Invention

[0005] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art and provide a sound-generating device.

[0006] To achieve the above-mentioned purpose, the sound-generating device proposed in the present invention comprises:

[0007] a housing having an opening;

[0008] a vibration system disposed in the housing;

[0009] A front cover is provided on the opening of the housing and is provided with a sound outlet;

[0010] The front cover includes an annular main body portion fixed on the end surface of the shell and a cover plate fixed above the main body portion, and the sound outlet is opened on the cover plate; wherein,

[0011] The main body is made of metal material;

[0012] The cover plate is made of a plastic material, the Young's modulus of the plastic material is greater than or equal to 2000 MPa, and a rib structure for dividing the sound outlet is integrally formed on the cover plate.

[0013] Optionally, the main body is made of copper or stainless steel.

[0014] Optionally, the cover sheet may be made of PET, PEN, Mylar or PI.

[0015] Optionally, the cover sheet has a thickness of 0.05-0.1 mm.

[0016] Optionally, the main body includes an outer ring portion and an inner ring portion, the outer ring portion is fixed to the end face of the shell, the cover plate is fixed to the inner ring portion, and the thickness of the portion where the inner ring portion and the cover plate are fixed is 0.1-0.15 mm.

[0017] Optionally, the inner ring portion is protruded from the outer ring portion in a direction away from the vibration system.

[0018] Optionally, the cover sheet and the inner ring portion are bonded together by UV glue, and the thickness of the UV glue is 0.01-0.02 mm.

[0019] Optionally, a dustproof net covering the sound outlet is provided on the cover plate.

[0020] Optionally, the dustproof net is adhered to the surface of the cover facing the vibration system, the edge of the dustproof net is located inside the inner edge of the main body, and the thickness of the dustproof net is less than 0.1 mm.

[0021] Optionally, the rib structure is a long strip structure or a cross structure.

[0022] The present invention further provides an electronic device, comprising a device housing and the above-described sound-generating device, wherein the device housing has a receiving cavity and a sound output channel communicating with the receiving cavity, the sound-generating device is disposed within the receiving cavity, and a vibration system of the sound-generating device is disposed toward the sound output channel;

[0023] The main body of the sound-generating device includes an outer ring portion and an inner ring portion, the outer ring portion is fixed to the end surface of the shell, the cover is fixed to the inner ring portion, and the inner ring portion is protruded from the outer ring portion in a direction away from the vibration system;

[0024] The inner surface of the device housing is provided with a fixed step surrounding the sound outlet channel, the outer ring portion abuts against the fixed step, and the orthographic projection of the inner ring portion is located in the sound outlet channel.

[0025] In the present invention, the front cover of the sound-generating device is constructed from two parts: a main body and a cover plate. The main body is made of metal, and the cover plate is made of plastic. This combination of metal and plastic ensures the necessary strength and heat dissipation of the front cover by leveraging the metal's hardness and thermal conductivity. The plastic's excellent resilience also mitigates the problem of rib deformation, resulting in a more stable overall structure. Furthermore, since the main body and cover plate are manufactured separately, the metal strength requirement is lower, allowing copper to be used, reducing processing difficulty, simplifying the component production process, and lowering overall costs. Furthermore, the use of plastic and UV adhesive reduces the overall thickness of the central region, making more efficient use of space and allowing for heightening the central magnetic circuit to enhance acoustic performance. Furthermore, because the inner ring portion of the front cover protrudes from the outer ring portion and is lower in height than the inner ring portion, when mated with an electronic device, the outer ring portion abuts a fixed step on the device housing, and the inner ring portion's orthographic projection is located within the sound output channel. The height space occupied by the sound-generating device can be calculated based on the thickness of the corresponding portion of the outer ring portion, thereby reducing the height space required by the sound-generating device. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

[0027] Figure 1 It is a structural diagram of a sound-generating device with a traditional front cover in the prior art.

[0028] Figure 2 It is a cross-sectional view of a sound-generating device with a traditional front cover in the prior art.

[0029] Figure 3 Schematic diagram of the structure of an acoustic device according to an embodiment of the present invention.

[0030] Figure 4 FIG. 1 is a cross-sectional view of an acoustic device according to an embodiment of the present invention.

[0031] Description of reference numerals:

[0032] 1: Outer shell; 2: Vibration system; 3: Front cover; 31: Main body; 311: Inner ring; 312: Outer ring; 32: Cover; 321: Sound outlet; 322: Rib structure; 33: Dustproof net; 34: UV adhesive; 35: Double-sided tape; 4: Traditional front cover; 41: Cross rib. DETAILED DESCRIPTION

[0033] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention.

[0034] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

[0035] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0036] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0037] It should be noted that like reference numerals and letters refer to like items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0038] In the embodiments of the present invention, please refer to Figures 3 and 4 The sound-generating device includes a housing 1, a vibration system 2, a magnetic circuit system, and a front cover 3. The housing 1 has an opening, the vibration system 2 is arranged inside the housing 1, the front cover 3 covers the opening of the housing 1, and the front cover 3 is provided with a sound outlet 321. The vibration system 2 includes a diaphragm and a voice coil fixed to one side of the diaphragm. The diaphragm includes a center portion, a folding ring portion arranged around the center portion, and a fixed portion arranged around the folding ring portion. The diaphragm may also include a composite layer coupled to the center portion. The magnetic circuit system includes a magnetic yoke, and the magnetic yoke is provided with an inner magnetic circuit portion and an outer magnetic circuit portion, forming a magnetic gap therebetween for accommodating the voice coil. In one case, the inner magnetic circuit portion includes a center magnet arranged at the center of the magnetic yoke and a center magnetic plate arranged on the center magnet, and the outer magnetic circuit portion includes a side magnet arranged at the edge of the magnetic yoke and a side magnetic plate arranged on the side magnet.

[0039] Furthermore, the front cover 3 includes an annular main body 31 and a cover plate 32 with a sound outlet 321. The main body 31 is fixed on the end face of the shell 1, and the cover plate 32 is fixed above the main body 31. The rib structure 322 for dividing the sound outlet 321 is integrally formed with the cover plate 32. Among them, the main body 31 is made of metal material; the cover plate 32 is made of plastic material. The above-mentioned plastic material is selected from a material with a certain strength and elasticity, which can not only form a stable supporting component but also have a rebound effect when slightly deformed. The Young's modulus of the plastic material is greater than or equal to 2000MPa, and the Young's modulus is not greater than 8000MPa. The front cover 3 made by combining metal material and plastic material not only ensures its necessary strength and heat dissipation effect by utilizing the hardness and thermal conductivity of the metal material, but also solves the problem of easy deformation of the rib structure 322 by utilizing the good rebound elasticity of the selected plastic material, and the overall structure is more stable. On the other hand, since the main body 31 and the cover plate 32 are made separately, the production process of the components is simplified and the overall cost is reduced.

[0040] In the technical solution of the present invention, since the main body 31 of the front cover 3 eliminates the cross-rib structure, the manufacturing process is simple and the material strength requirements are low. Therefore, the main body 31 can be made of copper, which has good machinability. When the front cover 3 is made of copper, the processing of the front cover 3 is relatively easy. In addition, copper can be recycled multiple times without affecting its mechanical properties, which can significantly save resources. In some applications, the main body 31 can also be made of stainless steel. Stainless steel has high hardness and good corrosion resistance. When the front cover 3 is made of stainless steel, the material cost is relatively low. Of course, in other embodiments, other materials besides the above materials can also be selected for the main body 31.

[0041] The material of the cover sheet 32 ​​can be PET, PEN, Mylar, or PI. In the technical solution of the present invention, the material of the cover sheet 32 ​​is PET. Although this type of material is not as strong as conventional materials and will deform when pressed, it has good resilience. After the stress is removed, the cover sheet 32 ​​can partially return to its original shape. On the one hand, it prevents damage and deformation by production line equipment during production and assembly. On the other hand, it avoids the risk of debris from falling when the stainless steel front cover is dropped, and the risk of deformation of the rib structure 322 when the copper front cover is dropped. Of course, in other embodiments, in addition to the above materials, other materials can also be selected for the cover sheet 32.

[0042] The cover plate 32 is provided with a rib structure 322 integrally formed therewith, dividing the sound outlet 321. In the technical solution of the present invention, the rib structure 322 is a cross-shaped structure to ensure structural stability while minimizing the impact on the sound output. In other usage scenarios, the rib structure 322 can also be a long strip structure.

[0043] In the technical solution of the present invention, the main body 31 includes an outer ring portion 312 and an inner ring portion 311. The outer ring portion 312 is fixed to the end surface of the housing 1, and the cover 32 is fixed to the inner ring portion 311. The inner ring portion 311 is protruded from the outer ring portion 312 in the direction away from the vibration system 2, which is equivalent to forming a recessed structure in the inner ring portion 311. This increases the distance between the front cover 3 and the vibration system 2, thereby increasing the space for the vibration system 2 to vibrate. This prevents the vibration system 2 from contacting the front cover 3 and hindering the vibration of the vibration system 2, ensuring the vibration freedom of the vibration system 2 and improving the acoustic performance of the sound-generating device. At the same time, because the space for the vibration system 2 is increased by providing a groove in the main body 31, the outer ring portion 312 is a flat structure. As a result, the central portion of the sound-generating device is higher, and the outer ring portion 312 is lower than the inner ring portion 311. When used with an electronic device, the space occupied in the vertical direction can be calculated based on the thickness of the corresponding portion of the outer ring portion 312, thereby reducing the height space required for the sound-generating device.

[0044] In the technical solution of the present invention, a dustproof net 33 covering the sound outlet 321 is provided on the cover 32. The dustproof net 33 is adhered to the surface of the cover 32 facing the vibration system 2, which can effectively prevent external dust from entering the main body of the sound-emitting device through the sound outlet 321, thereby achieving a dustproof effect and preventing external dust from damaging the electronic components in the sound-emitting device.

[0045] Furthermore, the edge of the dustproof net is located inside the inner edge of the main body. Compared with the traditional front cover 4, the thickness of the front cover 3 made of a combination of metal material and plastic material can be made thinner in the central area.

[0046] Specifically, the thickness of the cover sheet 32 ​​is 0.05-0.1mm, the thickness of the portion where the inner ring portion 311 and the cover sheet 32 ​​are fixed is 0.1-0.15mm, and the cover sheet 32 ​​and the inner ring portion 311 are bonded together by UV glue 34. Since the UV glue 34 has a low viscosity before curing and good firmness and high stability after curing, a thinner thickness than double-sided tape can be used, reaching 0.01-0.02mm. In addition, the thickness of the dustproof net 33 is less than 0.1mm. In the technical solution of the present invention, if Figure 4 As shown, the cover sheet 32 ​​is made of PET material, and its thickness can be as high as 0.05mm. The thickness of the inner ring portion 311 and the portion where the cover sheet 32 ​​is fixed is 0.1mm. The thickness of the UV glue 34 can be 0.01mm. The thickness of the dustproof net 33 is 0.05mm. The thickness of the double-sided tape 35 used to bond the dustproof net 33 to the cover sheet 32 ​​is 0.05mm.

[0047] Since the edge of the dust screen 33 is located inside the inner edge of the main body 31, and the total thickness of the dust screen 33 and the double-sided tape 35 is not greater than the total thickness of the portion where the inner ring 311 is fixed to the cover sheet 32 ​​plus the UV adhesive 34, it is not difficult to understand that the total thickness of the center area of ​​the front cover 3 in the technical solution of the present invention is the sum of the thickness of the cover sheet, the thickness of the inner ring and the thickness of the UV adhesive, which is 0.16mm. Figure 2 As shown, the corresponding cross ribs 41 are attached to the dustproof cloth via double-sided tape 35. To ensure strength, the cross ribs 41 are typically 0.15mm thick, the dustproof net 33 is 0.05mm thick, and the double-sided tape 35 is 0.05mm thick. Therefore, the total thickness of the center area of ​​the conventional front cover 4 is 0.25mm. This allows the sound-generating device of the present invention to save 0.09mm of space in the thickness direction, which can be used to heighten the central magnetic circuit and improve acoustic performance. This is particularly important as electronic devices such as mobile phones tend to be thinner and lighter.

[0048] The present invention also provides an electronic device comprising a device housing and a sound-emitting device that utilizes all of the technical solutions of the above-described embodiments, wherein the device housing has a receiving cavity and a sound outlet channel connected to the receiving cavity, the sound-emitting device is disposed within the receiving cavity, and the vibration system 2 of the sound-emitting device is disposed toward the sound outlet channel; the body 31 of the sound-emitting device comprises an outer ring portion 312 and an inner ring portion 311, the outer ring portion 312 being fixed to the end face of the housing 1, the cover 32 being fixed to the inner ring portion 311, and the inner ring portion 311 being protruded from the outer ring portion 312 in a direction away from the vibration system 2; the inner surface of the device housing is provided with a fixed step surrounding the sound outlet channel, the outer ring portion 312 abuts the fixed step, and the orthographic projection of the inner ring portion 311 is located in the sound outlet channel. Thus, when the sound-emitting device is used in conjunction with the electronic device, the space occupied in the height direction can be calculated based on the thickness of the corresponding portion of the outer ring portion 312, thereby reducing the height space requirement of the sound-emitting device.

[0049] Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It should be understood by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A sound-generating device, comprising: A housing having an opening; A vibration system is disposed in the housing; A front cover, which is arranged on the opening of the shell and has a sound outlet; It is characterized in that The front cover comprises an annular main body portion fixed on the end surface of the shell and a cover sheet fixed above the main body portion, and the sound outlet is opened on the cover sheet; wherein, The main body is made of metal material; The cover plate is made of a plastic material, the Young's modulus of the plastic material is greater than or equal to 2000 MPa and less than or equal to 8000 MPa, and a rib structure for dividing the sound outlet is integrally formed on the cover plate.

2. The sound generating device according to claim 1, characterized in that: The main body is made of copper or stainless steel.

3. The sound generating device according to claim 1, characterized in that: The cover sheet may be made of PET, PEN, Mylar or PI.

4. The sound generating device according to claim 1, characterized in that: The thickness of the cover sheet is 0.05-0.1 mm.

5. The sound generating device according to claim 1, characterized in that: The main body comprises an outer ring portion and an inner ring portion, the outer ring portion is fixed on the end surface of the outer shell, the cover sheet is fixed on the inner ring portion, and the thickness of the portion where the inner ring portion and the cover sheet are fixed is 0.1-0.15 mm.

6. The sound generating device according to claim 5, characterized in that: The inner ring portion is protruded from the outer ring portion in a direction away from the vibration system.

7. The sound generating device according to claim 5, characterized in that: The cover sheet and the inner ring portion are bonded together by UV glue, and the thickness of the UV glue is 0.01-0.02 mm.

8. The sound generating device according to claim 1, characterized in that: The cover sheet is provided with a dustproof net covering the sound outlet.

9. The sound generating device according to claim 8, characterized in that: The dustproof net is bonded to the surface of the cover plate facing the vibration system, the edge of the dustproof net is located on the inner side of the inner edge of the main body, and the thickness of the dustproof net is less than 0.1 mm.

10. The sound generating device according to claim 1, characterized in that: The rib structure is a long strip structure or a cross structure.

11. An electronic device, characterized in that: It comprises a device housing and a sound-generating device as claimed in any one of claims 1 to 10, wherein the housing has a receiving cavity and a sound-generating channel connected to the receiving cavity, the sound-generating device is arranged in the receiving cavity, and the vibration system of the sound-generating device is arranged toward the sound-generating channel; The main body of the front cover of the sound-generating device comprises an outer ring portion and an inner ring portion, the outer ring portion is fixed to the end surface of the shell, the cover sheet is fixed to the inner ring portion, and the inner ring portion is convexly arranged on the outer ring portion in a direction away from the vibration system; The inner surface of the device housing is provided with a fixed step surrounding the sound outlet channel, the outer ring portion abuts against the fixed step, and the orthographic projection of the inner ring portion is located in the sound outlet channel.

Images