CN111935617A

CN111935617A - Sound production device

Info

Publication number: CN111935617A
Application number: CN202010624405.8A
Authority: CN
Inventors: 陈卫敏; 惠耀
Original assignee: Ruisheng Technology Nanjing Co Ltd
Current assignee: AAC Technologies Holdings Nanjing Co Ltd; Ruisheng Technology Nanjing Co Ltd
Priority date: 2020-06-30
Filing date: 2020-06-30
Publication date: 2020-11-13
Anticipated expiration: 2040-06-30
Also published as: CN111935617B; WO2022000847A1

Abstract

The invention discloses a sounding device, which comprises a basin frame, a vibration system and a magnetic circuit system, wherein the vibration system is respectively fixed on the basin frame; the magnetic circuit system comprises a magnetic yoke which is fixed on the basin frame in a supporting mode, the sounding device further comprises an elastic part arranged at an interval with the magnetic steel, the magnetic yoke is fixed on the basin frame through the elastic part to form an elastic connection structure, and the elastic part is made of damping materials and enables the resonant frequency of the magnetic circuit system to be consistent with the resonant frequency of the vibration system. Compared with the related art, the sounding device is high in reliability and good in user experience.

Description

Sound production device

[ technical field ] A method for producing a semiconductor device

The invention relates to the field of electroacoustic conversion, in particular to a sounding device applied to a portable electronic product.

[ background of the invention ]

With the advent of the mobile internet age, the number of smart mobile devices is increasing. Among the mobile devices, the mobile phone is undoubtedly the most common and portable mobile terminal device. At present, the functions of mobile phones are very diverse, one of them is a high-quality music function, and therefore, a sound generating device for playing sound is widely applied to the current smart mobile devices.

The sound production device of the related art includes a frame, and a vibration system and a magnetic circuit system respectively fixed to the frame. The vibration system comprises a vibrating diaphragm fixed on the basin frame and a voice coil fixed on the vibrating diaphragm; the magnetic circuit system further comprises main magnetic steel fixed on the magnetic yoke, auxiliary magnetic steel surrounding the outer side of the main magnetic steel at intervals and an auxiliary pole plate fixed on one side, away from the magnetic yoke, of the auxiliary magnetic steel, the auxiliary pole plate is fixed on the basin frame, a magnetic gap is formed between the main magnetic steel and the auxiliary magnetic steel at intervals, and the voice coil is inserted into the magnetic gap.

However, in the sound generation device of the related art, the voice coil drives the diaphragm to vibrate and generate sound, the diaphragm vibrates to cause the basin frame to be stressed, and when the stress is large near the resonant frequency or when the voltage is large, the stress obviously causes the shell vibration of the device shell connected with the basin frame, so that the user experience is not good. In addition, the vibration of the vibrating diaphragm also causes the reaction force of the vibration of the basin frame, and the reaction force is superposed on the voice coil, so that the heating condition of the voice coil is caused by the superposition stress of the ampere force of the voice coil on the magnetic circuit system and the reaction force, the damage risk of the sounding device is increased, and the reliability of the sounding device is low.

Therefore, there is a need to provide a new sound generation device to solve the above technical problems.

[ summary of the invention ]

The invention aims to overcome the technical problems and provide a sound production device with high reliability and good user experience.

In order to achieve the purpose, the invention provides a sounding device which comprises a basin frame, a vibration system and a magnetic circuit system, wherein the vibration system is respectively fixed on the basin frame; the magnetic circuit system is fixed in including the support the yoke of basin frame, sound production device still include with the elastic component that the magnet steel interval set up, the yoke passes through the elastic component is fixed in the basin frame, magnetic circuit passes through the elastic component produce with vibration opposite direction's of vibration system vibration, the elastic component is for making by damping material and making magnetic circuit system vibration's resonant frequency with the resonant frequency of vibration system vibration is unanimous.

Preferably, the elastic part is made of one or more of simple substance high damping material, high polymer composite high damping material and metal composite damping structure.

Preferably, the simple substance high damping material is damping rubber and/or foaming foam.

Preferably, the high-damping polymer composite material is a composite material of particle doped fiber and/or laminated board type.

Preferably, the elastic part is fixed on the basin frame and the magnetic yoke respectively in a glue bonding fixing mode and/or an ultrasonic welding mode.

Preferably, the metal composite damping structure is a high damping metal and/or constrained layer damping structure.

Preferably, the elastic piece is fixed on the basin frame and the magnet yoke respectively in a glue bonding fixing mode and/or an electric heating welding mode.

Preferably, the elastic member extends along a vibration direction of the vibration system, and the elastic member has any one or more of a square structure, a cylindrical structure and a wave-shaped structure.

Preferably, the elastic parts comprise four elastic parts, and the four elastic parts are symmetrically distributed on the periphery of the magnetic yoke in pairs and are connected with the magnetic yoke.

Preferably, the magnetic yoke is of a rectangular structure with round corners, the magnetic yoke comprises four connecting portions and four straight edge portions respectively connected with two adjacent connecting portions, and the four elastic members are fixed on the connecting portions or symmetrically arranged on two groups of opposite straight edge portions respectively.

Preferably, the basin stand is close to a fixing groove formed by recessing the magnetic circuit system in a direction away from the magnetic circuit system, and the elastic piece is inserted into the fixing groove to form a fixing structure.

Preferably, the magnetic circuit system further comprises a secondary pole plate arranged at an interval with the magnetic yoke, and the secondary pole plate is fixed on the basin frame.

Compared with the prior art, the sounding device is characterized in that the elastic piece is arranged between the basin frame and the magnet yoke, and the elastic piece is respectively connected with the basin frame and the magnet yoke. The vibration system vibrates to enable the magnetic circuit system to generate acting force opposite to the vibration direction of the vibration system through the elastic piece, the vibration of the magnetic circuit system and the vibration of the vibration system form two suspension systems together and depend on ampere force vibration, and the excitation of the two suspension systems are acting force and reacting force mutually. Wherein the elastic member is made of a damping material and the resonant frequency of the vibration of the magnetic circuit system is made to coincide with the resonant frequency of the vibration system. The structure enables the stress of the basin frame to be close to zero, and the vibration of the basin frame is small, so that the shell of the terminal equipment vibrates little, and the user experience is good. In addition, the vibration of the two suspension systems is reversed, so that the heating of the voice coil is low, and the reliability of the sounding device is high.

[ description of the drawings ]

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:

FIG. 1 is a schematic perspective view of a sound device according to the present invention;

FIG. 2 is an exploded perspective view of a sound device according to the present invention;

FIG. 3 is a sectional view taken along line A-A of FIG. 1;

FIG. 4 is a schematic view of an assembly structure of the magnetic circuit system and the elastic member of the sound generating device of the present invention;

FIG. 5 is a schematic perspective view of another embodiment of the elastic member of the present invention;

FIG. 6 is a graph of frequency versus displacement response function in a comparative test of the present invention;

FIG. 7 is a graph of frequency versus total reaction force response function in a comparative test of the present invention.

[ detailed description ] embodiments

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-4, a sound production device 100 is provided. The sounder 100 includes a frame 1, a vibration system 2, a magnetic circuit system 3, and an elastic member 4.

The basin stand 1 is used for supporting the vibration system 2 and the magnetic circuit system 3, and in the embodiment, the basin stand 1 is rectangular. The magnetic circuit system 3 has a magnetic gap 30, and the magnetic circuit system 3 is used for driving the vibration system 2 to vibrate and generate sound.

The vibration system 2 comprises a vibrating diaphragm 21 fixed on the basin frame 1, a voice coil 22 inserted in the magnetic gap 30 and driving the vibrating diaphragm 21 to vibrate and sound, an auxiliary vibrating diaphragm 23 fixed on the basin frame 1 and opposite to and spaced from the vibrating diaphragm 21, and a framework 24 connecting the auxiliary vibrating diaphragm 23 and the vibrating diaphragm 21. One end of the auxiliary vibrating diaphragm 23 is fixed on the basin stand 1, and the other end of the auxiliary vibrating diaphragm is supported and fixed on the framework 24.

The diaphragm 21 is used for vibrating and sounding. Specifically, the diaphragm 21 includes a vibrating portion 211, a corrugated portion 212 bent and extended from a periphery of the vibrating portion 211, a fixing portion 213 bent and extended from a side of the corrugated portion 212 away from the vibrating portion 211, an opening 210 penetrating the vibrating portion 211 along a vibrating direction of the diaphragm 21, and a dome 214 covering the vibrating portion 211 and completely covering the opening 210.

The fixing portion 213 is fixed to the frame 1, and the loop portion 212 is an arc structure recessed in a direction away from the magnetic circuit system 3.

In the present embodiment, the voice coil 22 has a rectangular structure with rounded corners.

The auxiliary diaphragm 23 and the diaphragm 21 are disposed at an interval, in this embodiment, the auxiliary diaphragm 23 includes two and is disposed on two opposite sides of the voice coil 22 respectively.

The framework 24 connects the auxiliary diaphragm 23 to the diaphragm 21, and more preferably, the framework 24 connects the auxiliary diaphragm 23 to the voice coil 22, and further, the framework 24 connects the voice coil 22 to the diaphragm 21.

In this embodiment, the skeleton 24 connects the auxiliary diaphragm 23 and the diaphragm 21, and supports the diaphragm 21 to provide a larger elastic force, thereby improving the acoustic performance; moreover, the framework 24 also realizes the connection of the auxiliary diaphragm 23 and the top end of the voice coil 22, so as to improve the vibration stability, and meanwhile, the framework 24 also realizes the connection of the voice coil 22 and the diaphragm 21, so as to realize the driving vibration 21 of the voice coil 22.

In the present embodiment, the magnetic circuit system 3 includes a yoke 31, a main magnet 32 fixed to the yoke 31, a sub magnet 33 surrounding the main magnet 32 and forming a magnetic gap 30 with the main magnet 32, a sub pole plate 34 covering the sub magnet 33 on a side away from the yoke 31, and a main pole plate 35 covering the main magnet 32 on a side away from the yoke 31.

The main magnetic steel 32 and the auxiliary magnetic steel 33 are both magnetic steels of the magnetic circuit system 3. Of course, the magnetic circuit system 3 may also be provided with only one magnetic steel, that is, only the main magnetic steel 32 is provided, and the secondary magnetic steel 33 is not provided, and the main magnetic steel 32 and the turned edge of the magnetic yoke may form the magnetic gap 30 together.

The magnetic yoke 31 can be used for magnetic conduction, and driving force is improved. The yoke 31 is used to fix the main magnet steel 32 and the sub magnet steel 33.

The main magnet 32 and the sub magnet 33 are fixed to the yoke 31 and spaced apart from each other to form the magnetic gap 30. The two auxiliary diaphragms 23 are respectively arranged on two opposite sides of the short axis of the main magnetic steel 32.

The secondary magnetic steel 33 is disposed around the primary magnetic steel 32.

The counter plate 34 is fixed to the frame 1. The sub-plate 34 can be used for magnetic conduction to improve the driving force. The voice coil 22 is inserted into the magnetic gap 30, the magnetic circuit system 3 drives the voice coil 22 to vibrate through the magnetic gap 30, and the voice coil 22 vibrates to drive the diaphragm 21 to vibrate. The fixing part 213 of the diaphragm 21 is supported and fixed by the frame 1, so that the vibration system 2 vibrates to form a suspension system driven to vibrate with ampere force.

The main pole plate 35 can be used for magnetic conduction, and driving force is improved.

The elastic member 4 is fixed to the yoke 31. The magnetic yoke 31 is fixed on the basin stand 1 through the elastic member 4. The vibration system 2 vibrates, so that the magnetic circuit system 3 generates acting force opposite to the vibration direction of the vibration system 2 through the elastic piece 4, and the vibration of the magnetic circuit system 3 and the vibration of the vibration system 2 form two suspension systems together. Both suspension systems vibrate by means of ampere force, that is, the voice coil 22 is electrified to generate acting force on the diaphragm 21 under the action of the magnetic gap 30, so that the excitation of the two suspension systems is mutually acting force and reacting force.

The elastic member 4 extends in the vibration direction of the vibration system 2. The elastic element 4 is spaced from the magnetic steel, that is, the elastic element 4 is spaced from the main magnetic steel 32 and the auxiliary magnetic steel 33. The structure can avoid direct vibration superposition of two suspension systems, and is beneficial to improving the reliability of the sounding device 100.

Specifically, the number of the elastic members 4 is four, and the four elastic members 4 are symmetrically distributed on the periphery of the magnetic yoke 31 in pairs and are connected with the magnetic yoke 31. The elastic element 4 is spaced from the main magnetic steel 32 and the auxiliary magnetic steel 33. In the present embodiment, the yoke 31 has a rectangular structure with rounded corners. The magnetic yoke 31 includes four connecting portions 311 and four straight side portions 312 respectively connected to two adjacent connecting portions 311, and the four elastic members 4 are fixed to the connecting portions 311 or symmetrically disposed on two sets of two opposite straight side portions 312 respectively. This structure makes the elastic support of the frame 1 by the elastic member 4 more stable.

In order to better fix the elastic member 4 to the frame 1, a fixing groove 101 is formed by recessing the frame 1 near the magnetic circuit system 3 in a direction away from the magnetic circuit system 3, and the elastic member 4 is inserted into the fixing groove 101 to form a fixing structure. This structure is also advantageous in reducing the height of the sound-producing device 100 in the vibration direction of the diaphragm 21, which is advantageous in miniaturizing the sound-producing device 100.

The elastic member 4 is made of a damping material. The elastic part 4 is in any one or more of a square structure, a cylindrical structure and a wave-shaped structure. That is to say, the elastic member 4 is configured with different thicknesses and different shapes by setting the high damping material of the elastic member 4, so that the rigidity of the elastic support of the basin stand 1 by the elastic member 4 is realized.

The elastic part is made of damping material and enables the resonant frequency of the vibration of the magnetic circuit system 3 to be consistent with the resonant frequency of the vibration system 2. The counter-vibration of the two suspension systems. The support reaction force of each suspension system of the two suspension systems is solved through a vibration equation ma + rv + kx ═ F, and the minimum total support reaction force is taken as an optimization target. The structural rigidity of the suspension system and the damping of said elastic element 4 are optimized. The optimization result shows that the optimal design is that the resonant frequency of the suspension system formed by the vibration of the vibration system 2 is basically consistent with the resonant frequency of the suspension system formed by the vibration of the magnetic circuit system 3, and the total support reaction force can be approximately zero when the damping of the elastic part 4 is proper damping (the larger the damping is, the better the damping is). This structure makes the atress of basin frame 1 is close to zero, the vibration of basin frame 1 is little makes terminal equipment's shell vibrate for user experience is good. In addition, the vibration of the two suspension systems is reversed, so that the heating of the voice coil 22 is low, and the reliability of the sound generating device 100 is high. In addition, with this design, the ampere force increases when the voice coil 22 vibrates inward and decreases when it vibrates outward, increasing the sustainable power of the sound device 100.

Specifically, the elastic member 4 is made of one or more of a simple substance high damping material, a polymer composite high damping material and a metal composite damping structure.

It should be noted that the materials used for the elastic component 4, such as the simple substance high damping material, the polymer composite high damping material and the metal composite damping structure, are all conventional materials used as elastic structures in the art, and the functions of these materials are to adjust the damping elasticity.

Wherein the simple substance high damping material is damping rubber and/or foam. The elastic piece 4 is fixed on the basin frame 1 and the magnetic yoke 31 in a glue bonding and fixing mode. The damping rubber and the foam are both conventional materials used in the art as elastic structures.

The metal composite damping structure is a high-damping metal and/or constrained layer damping structure. When the elastic part 4 is the metal composite damping structure, the elastic part 4 is fixed on the frame 1 and the magnetic yoke 31 respectively by glue bonding and/or electric heating welding. The high damping metal and the constraining layer damping structure are conventional materials used in the art as elastic structures.

Referring to fig. 5, fig. 5 is a schematic perspective view of an elastic member according to another embodiment of the present invention. The high-damping polymer composite material is a composite material of particle doped fiber and/or laminated board. When the elastic part 4 is the polymer composite high damping material, the elastic part 4 is fixed on the frame 1 and the magnetic yoke 31 respectively by glue bonding and/or ultrasonic welding. The particle-doped fiber-doped and laminate-type composites are conventional materials used in the art as elastic structures.

Of course, without being limited thereto, the elastic member 4, the frame 1, and the yoke 31 may be integrally formed under certain process conditions.

In order to verify the effect of the elastic member 4 of the present invention, a frequency-displacement response index test and a frequency-support reaction force response index test were performed by the comparative examples and examples.

Wherein, the sounding device used in the test of the comparison example is only provided with a rigid connecting structure. Whereas embodiments use the sounder device 100, i.e., the sounder device 100 has a double suspension system.

Referring to FIG. 6, FIG. 6 is a graph of frequency-shift response function in a comparative test according to the present invention.

D1 is a frequency versus displacement response function curve for the sounding device of the comparative example.

W1 is a plot of the sounder device 100 frequency versus displacement response function of an example.

According to the test results, the following test results are obtained: the sound production device 100 of the present invention has a small vibration displacement.

Referring to fig. 7, fig. 7 is a graph of frequency versus total branch reaction force response function in a comparative test of the present invention.

D2 is a plot of sounder frequency versus total reaction force response for the control.

W2 is the plot of the sounder device 100 frequency versus total reaction force response function for the example.

According to the test results, the following test results are obtained: the sound production device 100 of the present invention has a small total thrust force.

In summary, the sounding device 100 of the present invention has a double suspension system because the elastic member 4 is disposed on the sounding device 100, so that the force applied to the tub frame 1 of the sounding device 100 is small, the vibration is also small, and the vibration of the sounding device 100 is small; and is advantageous in that the heat generation of the voice coil 22 is small, thereby making the reliability of the sound generating device 100 high.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. A sounding device comprises a basin frame, a vibration system and a magnetic circuit system, wherein the vibration system is respectively fixed on the basin frame; the magnetic circuit system comprises a magnetic yoke which is supported and fixed on the basin frame, and is characterized in that the sound production device further comprises an elastic part, the magnetic yoke is fixed on the basin frame through the elastic part, the magnetic circuit system generates vibration opposite to the vibration direction of the vibration system through the elastic part, and the elastic part is made of damping materials and enables the resonant frequency of the vibration of the magnetic circuit system to be consistent with the resonant frequency of the vibration system.

2. The sounding device according to claim 1, wherein the elastic member is made of one or more of simple substance high damping material, high polymer composite high damping material and metal composite damping structure.

3. The sounding device according to claim 2, wherein the elemental high damping material is damping rubber and/or foam.

4. The sounding device according to claim 2, wherein the polymer composite high damping material is a particle doped fiber doped and/or laminated board type composite.

5. The sound production device as claimed in claim 4, wherein the elastic member is fixed to the frame and the yoke by means of glue bonding and/or ultrasonic welding.

6. The sound device as claimed in claim 2, wherein the metal composite damping structure is a high damping metal and/or constrained layer damping structure.

7. The sound production device as claimed in claim 6, wherein the elastic member is fixed to the frame and the yoke by means of glue bonding and/or electro-thermal welding.

8. The sounder device according to claim 1, wherein the resilient member extends in a direction of vibration of the vibration system, and the resilient member has any one or more of a square configuration, a cylindrical configuration, and a wave configuration.

9. The sounder device according to claim 1, wherein the number of the elastic members is four, and four elastic members are symmetrically distributed on the periphery of the yoke in pairs and connected with the yoke.

10. The sounding device according to claim 9, wherein the yoke has a rectangular structure with rounded corners, the yoke includes four connecting portions and four straight edge portions respectively connected to two adjacent connecting portions, and four elastic members are fixed to the connecting portions or symmetrically disposed on two sets of two opposite straight edge portions respectively.

11. The sounder device according to claim 1, wherein the frame is recessed adjacent to the magnetic circuit system in a direction laterally away from the magnetic circuit system to form a retaining groove, and the resilient member is inserted into the retaining groove to form a retaining structure.

12. The sounder device according to claim 1, wherein the magnetic circuit system further comprises a secondary plate spaced from the magnetic yoke, the secondary plate being secured to the basin stand.