CN111866659A

CN111866659A - Sound production device and electronic equipment

Info

Publication number: CN111866659A
Application number: CN202010689015.9A
Authority: CN
Inventors: 翟成祥
Original assignee: Goertek Inc
Current assignee: Goertek Inc
Priority date: 2020-07-15
Filing date: 2020-07-15
Publication date: 2020-10-30

Abstract

The invention discloses a sound production device which comprises a shell, a vibration system and a front cover. The shell is provided with an opening, the vibration system is arranged in the shell, and the front cover is covered on the opening of the shell and is provided with a sound outlet. The front cover is provided with a body part and a cover plate, and the sound outlet is arranged on the cover plate; wherein the body part is made of metal material; the cover plate is made of plastic material, and the Young modulus of the plastic material is larger than or equal to 2000 MPa. The front cover is made by combining the metal material and the plastic material, the necessary strength and the heat dissipation effect of the front cover are ensured by utilizing the hardness and the heat conduction performance of the metal material, the problem that a rib structure is easy to deform is solved by utilizing the good rebound resilience of the selected plastic material, and the whole structure is more stable; on the other hand, because the body part and the cover plate are manufactured separately, the requirement on the strength of metal materials is low, copper materials can be selected, the processing difficulty is reduced, the production process of parts is simplified, and the overall cost is reduced.

Description

Sound production device and electronic equipment

Technical Field

The invention relates to the technical field of electroacoustic conversion, in particular to a sound generating device and electronic equipment.

Background

With the rising of the stereo requirement of the mobile phone, the design of the double loudspeakers is more and more extensive, but the space in the thickness direction of the mobile phone, namely the height direction of the sound generating device, is very tight. In order to save space in the height direction, the conventional front cover 4 is designed in the shape shown in fig. 1 and 2: the periphery is short, the central area is convex, and the convex part is provided with a dust screen 33. When the mobile phone is assembled, the peripheral low part is sealed with the middle frame of the mobile phone, and the raised part of the central area is arranged in the front cavity of the mobile phone. The front cover of this design has the following problems:

1. if the front cover is made of stainless steel, scrap iron is easily generated in the falling process; if the copper material is adopted, the strength of the middle cross rib part 41 is weak, and the cross rib part 41 is easy to deform in the falling process. In addition, the metal cross rib 41 is also easily deformed during the production process, which causes noise.

2. The metal cross rib part 41 is attached to the dust screen 33, so that the whole thickness is large, the occupied space is large, and the space utilization is not reasonable enough.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a sound production device.

In order to achieve the above object, the present invention provides a sound generating device, including:

a housing having an opening;

The vibration system is arranged in the shell;

the front cover is covered on the opening of the shell, and a sound outlet is formed in the front cover;

the front cover comprises an annular body part fixed on the end face of the shell and a cover plate fixed above the body part, and the sound outlet is formed in the cover plate; wherein the content of the first and second substances,

the body part is made of metal material;

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

Optionally, the body portion is made of copper or stainless steel.

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

Optionally, the thickness of the cover sheet is 0.05-0.1 mm.

Optionally, the body portion includes an outer ring portion and an inner ring portion, the outer ring portion is fixed to the end face of the housing, the cover plate is fixed to the inner ring portion, and a thickness of a portion, where the inner ring portion and the cover plate are fixed, is 0.1-0.15 mm.

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

Optionally, the cover plate is bonded to the inner ring portion through UV glue, and the thickness of the UV glue is 0.01-0.02 mm.

Optionally, a dust screen covering the sound outlet is arranged on the cover plate.

Optionally, the dust screen is adhered to a surface of the cover plate facing the vibration system, an edge of the dust screen is located inside an inner edge of the body portion, and a thickness of the dust screen is less than 0.1 mm.

Optionally, the rib structure is a strip structure or a cross structure.

The invention also provides electronic equipment which comprises an equipment shell and the sound generating device, wherein the equipment shell is provided with an accommodating cavity and a sound generating channel communicated with the accommodating cavity;

the body part of the sounding device comprises an outer ring part and an inner ring part, the outer ring part is fixed on the end surface of the shell, the cover plate is fixed on the inner ring part, and the inner ring part is convexly arranged on the outer ring part in the direction far away from the vibration system;

the inner surface of the equipment shell is provided with a fixed step surrounding the sound outlet channel, the outer ring part is abutted against the fixed step, and the orthographic projection of the inner ring part is positioned in the sound outlet channel.

According to the invention, the front cover of the sound generating device is arranged into the body part and the cover plate, wherein the body part is made of a metal material, the cover plate is made of a plastic material, and through the combination of the metal material and the plastic material, the necessary strength and the heat dissipation effect of the front cover are ensured by utilizing the hardness and the heat conduction performance of the metal material, and the problem that a rib structure is easy to deform is solved by utilizing the good rebound resilience of the selected plastic material, so that the whole structure is more stable; on the other hand, because the body part and the cover plate are manufactured separately, the requirement on the strength of metal materials is low, copper materials can be selected, the processing difficulty is reduced, the production process of parts is simplified, and the overall cost is reduced. Meanwhile, the total thickness of a central area is reduced through the application of the plastic material and the UV glue, the space utilization is more reasonable, and the plastic material can be used for heightening a central magnetic circuit and improving the acoustic performance. In addition, because the inner ring part of the front cover is convexly arranged on the outer ring part, the height of the outer ring part is lower than that of the inner ring part, when the front cover is matched with the electronic equipment, the outer ring part is abutted against a fixed step of the equipment shell, the orthographic projection of the inner ring part is positioned in the sound outlet channel, and the space occupied in the height direction can be calculated according to the thickness of the corresponding part of the outer ring part, so that the space requirement of the sound generating device in the height direction is reduced.

Drawings

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.

Fig. 1 is a schematic structural view of a sound generating device provided with a conventional front cover in the related art.

Fig. 2 is a cross-sectional view of a prior art sound generating device provided with a conventional front cover.

Fig. 3 is a schematic structural diagram of an acoustic device according to an embodiment of the present invention.

Fig. 4 is a cross-sectional view of an acoustic device in accordance with an embodiment of the present invention.

Description of reference numerals:

1: a housing; 2: a vibration system; 3: a front cover; 31 a body portion; 311: an inner ring portion; 312: an outer ring portion; 32: a cover sheet; 321: a sound outlet; 322: a rib position structure; 33: a dust screen; 34: UV glue; 35: double-sided adhesive tape; 4: a conventional front cover; 41: a cross rib part.

Detailed Description

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

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.

Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.

In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

In an embodiment of the present invention, please refer to fig. 3 to 4 in combination, the sound generating apparatus includes a housing 1, a vibration system 2, a magnetic circuit system, and a front cover 3. Wherein, the shell 1 has an opening, the vibration system 2 is disposed in the shell 1, the front cover 3 covers the opening of the shell 1 and the front cover 3 is provided with a sound outlet 321. The vibration system 2 comprises a vibration diaphragm and a voice coil fixed on one side of the vibration diaphragm, the vibration diaphragm comprises a central part, a corrugated rim part arranged around the central part and a fixing part arranged around the corrugated rim part, and the vibration diaphragm also comprises a composite layer combined with the central part; the magnetic circuit system comprises a magnetic conducting yoke, wherein an inner magnetic circuit part and an outer magnetic circuit part are arranged on the magnetic conducting yoke, and a magnetic gap for accommodating the voice coil is formed between the inner magnetic circuit part and the outer magnetic circuit part. In one case, the inner magnetic path portion includes a central magnet disposed at a central position of the yoke and a central magnetic conductive plate disposed on the central magnet, and the outer magnetic path portion includes an edge magnet disposed at an edge position of the yoke and an edge magnetic conductive plate disposed on the edge magnet.

Further, the front cover 3 includes a ring-shaped body portion 31 and a cover plate 32 provided with a sound outlet 321. The body 31 is fixed on the end face of the housing 1, the cover 32 is fixed above the body 31, and the rib structure 322 for dividing the sound outlet 321 is integrally formed with the cover 32. The body 31 is made of metal material; the cover plate 32 is made of plastic material, the plastic material is selected from materials with certain strength and elasticity, a stable supporting part can be formed, the plastic material has a rebound effect when slightly deformed, and the Young modulus of the plastic material is larger than or equal to 2000MPa and is not larger than 8000 MPa. The front cover 3 is made by combining the metal material and the plastic material, the necessary strength and the heat dissipation effect of the front cover are ensured by utilizing the hardness and the heat conduction performance of the metal material, the problem that the rib structure 322 is easy to deform is solved by utilizing the good rebound resilience of the selected plastic material, and the whole structure is more stable; on the other hand, since the body portion 31 and the cover plate 32 are separately manufactured, the manufacturing process of the parts is simplified, and the overall cost is reduced.

In the technical scheme of the invention, as the body part 31 of the front cover 3 cancels the cross rib structure, the manufacturing process is simple, and the requirement on material strength is low, the body part 31 can be made of copper, the copper has better machinability, when the front cover 3 is a copper piece, the front cover 3 is easier to process, and in addition, the copper can be recycled for a plurality of times without influencing the mechanical property, thereby greatly saving resources. In some applications, the body 31 may be made of stainless steel, which has high hardness and good corrosion resistance, and when the front cover 3 is made of stainless steel, the material cost is relatively low. Of course, in other embodiments, other materials may be selected for the body portion 31 in addition to the above materials.

The cover sheet 32 can be made of one of PET, PEN, Mylar or PI, in the technical scheme of the invention, the cover sheet 32 is made of PET, although the strength of the material is lower than that of a conventional material, and the deformation can occur during pressing, the material has good rebound resilience, and the cover sheet 32 can be restored after stress removal, so that the deformation caused by collision of production line equipment during production and assembly is prevented on one hand, and the risk of scrap falling when the stainless steel front cover falls and the risk of deformation of the rib structure 322 when the copper front cover falls are avoided on the other hand. Of course, in other embodiments, other materials may be selected for cover sheet 32 in addition to those described above.

The cover plate 32 is provided with a rib structure 322 integrally formed with the cover plate and dividing the sound outlet 321, and in the technical scheme of the invention, the rib structure 322 is a cross structure, so that the stability of the structure is ensured under the condition that the sound effect is not influenced as much as possible. In other usage scenarios, rib structure 322 may also be a strip-type structure.

In the technical scheme of the present invention, the body 31 includes an outer ring portion 312 and an inner ring portion 311, the outer ring portion 312 is fixed on the end surface of the housing 1, the cover plate 32 is fixed on the inner ring portion 311, the inner ring portion 311 is convexly disposed on the outer ring portion 312 in a direction away from the vibration system 2, that is, the inner ring portion 311 forms a concave structure, which is equivalent to increasing the distance between the front cover 3 and the vibration system 2, so that the vibration space of the vibration system 2 is enlarged, thereby preventing the vibration system 2 from contacting the front cover 3 to obstruct 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 apparatus. Meanwhile, because the space of the vibration system 2 is increased by arranging the groove on the body part 31, the outer ring part 312 is of a flat structure, so that the height of the central part of the sound generating device is higher, the height of the outer ring part 312 is lower than that of the inner ring part 311, when the sound generating device is matched with an electronic device, the space occupied in the height direction can be calculated according to the thickness of the corresponding part of the outer ring part 312, and the space requirement of the sound generating device in the height direction is reduced.

In the technical scheme of the invention, the cover plate 32 is provided with the dustproof net 33 covering the sound outlet 321, and the dustproof net 33 is adhered to the surface of the cover plate 32 facing the vibration system 2, so that external dust can be effectively prevented from entering the main body of the sound generating device through the sound outlet 321, a dustproof effect is achieved, and the electronic elements in the sound generating device are prevented from being damaged by the external dust.

Further, the edge of the dust-proof net is located inside the inner edge of the body portion, and the thickness of the front cover 3 made of a metal material in combination with a plastic material can be made thinner in the central area as compared with the conventional front cover 4.

Specifically, the thickness of the cover sheet 32 is 0.05-0.1mm, the thickness of the part, fixed with the cover sheet 32, of the inner ring portion 311 is 0.1-0.15mm, the cover sheet 32 is adhered with the inner ring portion 311 through the UV adhesive 34, and as the UV adhesive 34 is low in viscosity before curing and high in firmness and stability after curing, the thickness of the cover sheet can be thinner than that of a double-sided adhesive, and can reach 0.01-0.02mm, and the thickness of the dustproof net 33 is smaller than 0.1 mm. In the technical scheme of the invention, as shown in fig. 4, the cover sheet 32 is made of PET material, the thickness of the cover sheet 32 can be 0.05mm, the thickness of the part of the inner ring part 311 fixed with the cover sheet 32 is 0.1mm, the thickness of the UV glue 34 can be 0.01mm, the thickness of the dust screen 33 is 0.05mm, and the thickness of the double-sided glue 35 used for bonding the dust screen 33 to the cover sheet 32 is 0.05 mm.

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 and the cover sheet 32 are fixed plus the UV tape 34, it is understood that the total thickness of the central area of the front cover 3 in the technical solution of the present invention is 0.16mm of the sum of the thickness of the cover sheet, the thickness of the inner ring and the thickness of the UV tape. In the conventional front cover 4, as shown in fig. 2, the cross rib portion 41 is attached to the dustproof cloth through the double-sided adhesive tape 35, wherein the thickness of the cross rib portion 41 is usually set to 0.15mm to ensure the strength of the cross rib, the thickness of the dustproof mesh 33 is 0.05mm, and the thickness of the double-sided adhesive tape 35 is 0.05 mm. Therefore, the total thickness of the central area of the traditional front cover 4 is 0.25mm, so that the sound generating device of the technical scheme of the invention can save 0.09mm of space in the thickness direction, can be used for heightening a central magnetic circuit and improving the acoustic performance, and is particularly important under the trend that electronic equipment such as a mobile phone and the like is more prone to being designed to be light and thin.

The invention also provides electronic equipment which comprises an equipment shell and the sound generating device adopting the whole technical scheme of the embodiment, wherein the equipment shell is provided with an accommodating cavity and a sound generating channel communicated with the accommodating cavity, the sound generating device is arranged in the accommodating cavity, and the vibration system 2 of the sound generating device is arranged towards the sound generating channel; the body 31 of the sounding device comprises an outer ring part 312 and an inner ring part 311, the outer ring part 312 is fixed on the end surface of the casing 1, the cover plate 32 is fixed on the inner ring part 311, and the inner ring part 311 is convexly arranged on the outer ring part 312 in the 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 part 312 abuts against the fixed step, and the orthographic projection of the inner ring part 311 is positioned in the sound outlet channel. Thus, when the sound generating device is matched with the electronic equipment, the space occupied in the height direction can be calculated according to the thickness of the corresponding part of the outer ring part 312, and therefore the space requirement of the sound generating device in the height direction is reduced.

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 illustrative purposes only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims

1. A sound generating device comprising:

a housing having an opening;

the vibration system is arranged in the shell;

it is characterized in that the preparation method is characterized in that,

the body part is made of metal material;

2. The sound generating apparatus of claim 1 wherein said body portion is made of copper or stainless steel.

3. The sound production device as claimed in claim 1, wherein the cover sheet is made of PET, PEN, Mylar or PI.

4. The sound generating apparatus of claim 1, wherein the cover sheet has a thickness of 0.05-0.1 mm.

5. The sound generating apparatus as claimed in claim 1, wherein 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 housing, the cover plate is fixed on the inner ring portion, and the thickness of the portion of the inner ring portion fixed to the cover plate is 0.1-0.15 mm.

6. The sound generating apparatus according to claim 5, wherein said inner ring portion is protruded from said outer ring portion in a direction away from said vibration system.

7. The sounding device according to claim 5, wherein the cover plate is bonded to the inner ring portion by UV glue, and the thickness of the UV glue is 0.01-0.02 mm.

8. The sound generating apparatus according to claim 1, wherein a dust screen is provided on the cover plate to cover the sound outlet.

9. The sound generating apparatus according to claim 8, wherein the dust screen is adhered to a surface of the cover sheet facing the vibration system, an edge of the dust screen is located inside an inner edge of the body portion, and a thickness of the dust screen is less than 0.1 mm.

10. The sound generating apparatus of claim 1, wherein the rib structure is a strip-shaped structure or a cross-shaped structure.

11. An electronic device, comprising a device housing and the sound generating device of any one of claims 1 to 10, wherein the housing has a receiving cavity and a sound outlet channel communicated with the receiving cavity, the sound generating device is disposed in the receiving cavity, and a vibration system of the sound generating device is disposed toward the sound outlet channel;

the body part of the front cover of the sound generating device comprises an outer ring part and an inner ring part, the outer ring part is fixed on the end surface of the shell, the cover plate is fixed on the inner ring part, and the inner ring part is convexly arranged on the outer ring part in the direction far away from the vibration system;