Miniature loudspeaker

Abstract

The invention discloses a miniature loudspeaker, and relates to the technical field of audio equipment, and the miniature loudspeaker comprises a housing which is internally provided with a cavity; the vibrating diaphragm is connected with the shell and generates sound waves through vibration; the voice coil is arranged in the cavity, and one end of the voice coil is fixedly connected with the vibrating diaphragm and drives the vibrating diaphragm to vibrate; and the balancing part is arranged at one end, deviating from the vibrating diaphragm, of the voice coil and is connected with the shell and the voice coil, and the voice coil drives the balancing part to vibrate in the same direction or in the opposite direction relative to the vibrating diaphragm so as to absorb the vibration deviation of the vibrating diaphragm.

Description

Technical Field

[0001] The present invention relates to the technical field of audio devices, and particularly to a micro speaker. Background Art

[0002] In the current era of rapid development of digital and portable electronic devices, as a key component for audio output, micro speakers are widely used in various electronic products, such as smart phones, Bluetooth headsets, smart watches, tablet computers, and portable speakers. With the increasing demands of consumers for audio quality and device portability, more stringent challenges are posed to the performance of micro speakers.

[0003] From the perspective of market demand, on the one hand, consumers' pursuit of high-quality audio prompts device manufacturers to continuously seek audio solutions that can provide clearer and richer sound quality. In application scenarios such as music appreciation, video playback, and voice calls, users expect to obtain an auditory experience close to that of professional audio equipment. On the other hand, the trend of thinning and miniaturization of electronic devices requires micro speakers to minimize volume and weight while maintaining or even improving acoustic performance to adapt to the compact space layout inside the device.

[0004] However, the traditional diaphragm structure has obvious defects. The unreasonable diaphragm material and design make it difficult to achieve a uniform vibration mode during vibration. Driven by the sound signal, the vibration amplitudes and frequencies of different parts of the diaphragm are inconsistent, resulting in sound distortion, especially in the low-frequency band with a large amplitude, where the distortion phenomenon is more obvious, seriously affecting the clarity and purity of the sound quality. Summary of the Invention

[0005] The main object of the present invention is to provide a micro speaker, aiming to solve the problem that due to the defects of the traditional diaphragm structure of the current speaker, the vibration amplitudes and frequencies of different parts of the diaphragm are inconsistent, resulting in sound distortion.

[0006] To achieve the above object, the micro speaker proposed by the present invention includes:

[0007] A housing with a cavity formed inside;

[0008] A diaphragm connected to the housing and generating sound waves through vibration;

[0009] A voice coil disposed inside the cavity, and one end of the voice coil is fixedly connected to the diaphragm and drives the diaphragm to vibrate; and

[0010] A balancing member disposed at the end of the voice coil away from the diaphragm, connecting the housing and the voice coil, and the voice coil drives the balancing member to vibrate in the same or opposite direction relative to the diaphragm to absorb the vibration deviation of the diaphragm. Description of the Drawings

[0011] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0012] Figure 1 It is a schematic cross-sectional structure diagram of an embodiment of a micro speaker provided by the present invention;

[0013] Figure 2 It is a schematic structure diagram of an embodiment of a micro speaker provided by the present invention;

[0014] Figure 3 It is an exploded view of an embodiment of a micro speaker provided by the present invention from one angle;

[0015] Figure 4 It is an exploded view of an embodiment of a micro speaker provided by the present invention from another angle;

[0016] Figure 5 It is an exploded view of the magnetic circuit system of an embodiment of a micro speaker provided by the present invention.

[0017] Explanation of the reference numerals in the accompanying drawings:

[0018] 100, housing; 110, first housing; 120, second housing; 130, positioning convex portion; 140, positioning concave portion; 150, positioning groove; 160, limiting ring;

[0019] 200, diaphragm;

[0020] 300, voice coil;

[0021] 400, balancing member; 410, first connecting portion; 420, balancing portion; 430, second connecting portion;

[0022] 500, magnetic circuit system; 510, magnet; 520, magnetic bowl; 521, avoidance opening; 530, positioning block; 540, through hole; 550, magnetic conductive plate; 560, magnetic conductive ring.

[0023] The realization of the object, functional features and advantages of the present invention will be further described in conjunction with the embodiments with reference to the accompanying drawings. Detailed implementation manners

[0024] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0025] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present invention, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0026] In addition, if there are descriptions such as "first", "second", etc. involved in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel scenarios. Taking "A and / or B" as an example, it includes scenario A, or scenario B, or the scenario where A and B are satisfied simultaneously. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0027] In the prior art, there are obvious defects in the traditional diaphragm structure. The unreasonable diaphragm material and design make it difficult to achieve a uniform vibration mode during vibration. Driven by sound signals, the vibration amplitudes and frequencies of different parts of the diaphragm are inconsistent, resulting in sound distortion. Especially in the low-frequency band with a large amplitude, the distortion phenomenon is more obvious, seriously affecting the clarity and purity of the sound quality.

[0028] The present invention proposes a micro speaker.

[0029] Please refer to Figures 1 to 5As shown in the figure, in an embodiment of the present invention, the micro speaker includes: a housing 100, a diaphragm 200, a voice coil 300, and a balance member 400. Among them, a cavity is formed inside the housing 100; the diaphragm 200 is connected to the housing 100 and generates sound waves through vibration; the voice coil 300 is disposed inside the cavity, and one end of the voice coil 300 is fixedly connected to the diaphragm 200 and drives the diaphragm 200 to vibrate; the balance member 400 is disposed at one end of the voice coil 300 away from the diaphragm 200, and connects the housing 100 and the voice coil 300. The voice coil 300 drives the balance member 400 to vibrate in the same or opposite direction relative to the diaphragm 200 to absorb the vibration deviation of the diaphragm 200.

[0030] In the specific implementation process, a cavity is formed inside the housing 100, the voice coil 300 is accommodated inside the cavity, an opening is provided at one end of the cavity, the outer peripheral edge of the diaphragm 200 is fixedly connected to the housing 100, and the diaphragm 200 is disposed at the opening and seals the opening. One end of the voice coil 300 is connected to the diaphragm 200, and the other end is connected to the balance member 400. It can be understood that the voice coil 300 is connected to an external power supply and generates vibration when powered on. The vibration is transmitted to the diaphragm 200 to cause the diaphragm 200 to vibrate and generate sound waves. The balance member 400 is a film that can be driven to vibrate by the voice coil 300. The balance member 400 and the diaphragm 200 are respectively connected to opposite ends of the voice coil 300. When the diaphragm 200 vibrates, the voice coil 300 adjusts the vibration state of the balance member 400 according to the change of the sound signal, effectively compensating for the imbalance of the diaphragm 200 when vibrating in different frequency bands. For example, in the high-frequency band, the diaphragm 200 may vibrate unevenly due to factors such as rigidity, which reacts on the voice coil 300. The balance member 400 generates small vibrations in the opposite or same direction under the action of the voice coil 300 to correct the vibration deviation, making the overall vibration more stable and uniform, thereby significantly reducing sound distortion and improving the clarity and purity of the sound quality.

[0031] In this embodiment, the voice coil 300 is also optimized to cooperate with the balance member 400. Specifically, the voice coil 300 is wound with enameled wire, and single crystal copper material is specifically used, so that when passing through an audio current, it can generate a more accurate and stable magnetic force to drive the main diaphragm 200 and the auxiliary balance diaphragm 200 to vibrate in cooperation. The housing 100 is made of a lightweight material with good acoustic properties, such as a polymer composite material. The shape and size of the internal cavity are precisely acoustically simulated and optimized. Sound-absorbing materials are also provided inside the cavity, which not only provides good protection and fixation for the internal components, but also optimizes the sound radiation and propagation path, enabling the speaker to emit clearer and fuller sounds, and ensuring excellent acoustic performance while miniaturizing.

[0032] The technical solution of the present invention forms a cavity within the housing 100 to accommodate the voice coil 300 and the balance member 400, and the voice coil 300 drives the diaphragm 200 to vibrate to generate sound waves. Among them, the balance member 400 is fixedly connected to the end of the voice coil 300 facing away from the diaphragm 200. The voice coil 300 adjusts the vibration state of the balance member 400 according to the changes in the vibration of the diaphragm 200. Specifically, the voice coil 300 drives the balance member 400 to vibrate in the same or opposite direction relative to the diaphragm 200 to absorb the vibration deviation of the diaphragm 200, effectively compensating for the imbalance during the vibration of the diaphragm 200, making the overall vibration more stable and uniform, thereby significantly reducing sound distortion and improving the clarity and purity of the sound quality. Without occupying more internal space of the product, the micro speaker proposed by the technical solution of the present invention can provide better acoustic performance and more excellent sound performance effects, thereby improving the performance of the micro speaker, meeting the performance requirements, and enhancing the product competitiveness. The present invention can also achieve a good balance between miniaturization and high performance. By optimizing the structural design within the cavity, without significantly increasing the volume and weight, the acoustic performance of the micro speaker is greatly improved. Compared with traditional moving coil micro speakers, the products of the present invention have significant improvements in sound quality, high-frequency response, sensitivity, etc., while meeting the strict requirements of modern electronic devices for miniaturization, thinness, and lightness, and have broad application prospects, and can be widely applied to various portable electronic devices such as smart phones, wireless earphones, and smart wearable devices.

[0033] In the specific implementation process, the balance member 400 is a membranous structure that the voice coil 300 can drive to vibrate. The balance member 400 vibrates under the action of the voice coil 300 to correct the vibration deviation of the diaphragm 200. In this embodiment, the balance member 400 is made of a flexible material and pulls the voice coil 300 through elastic or flexible deformation, thereby correcting the vibration deviation. Specifically, the material of the balance member 400 is configured as one of PO, PPE, and silicone.

[0034] Refer to Figure 1 and Figure 5 As shown, in one embodiment, the balance member 400 includes a first connecting portion 410, a balance portion 420, and a second connecting portion 430. Among them, one end of the balance portion 420 is connected to the first connecting portion 410, and the other end is connected to the second connecting portion 430. The first connecting portion 410 is connected to the voice coil 300, and the second connecting portion 430 is connected to the housing 100.

[0035] In the specific implementation process, the balance member 400 is an integrally formed structure, and the first connecting portion 410, the second connecting portion 430, and the balance portion 420 are formed by bending. The first connecting portion 410 and the second connecting portion 430 are respectively bent and connected to both ends of the balance portion 420.

[0036] Further, the balancing portion 420 is arc-shaped. It can be understood that the arc-shaped balancing portion 420 can pull the voice coil 300 when the voice coil 300 drives it to vibrate to overcome the deformation that occurs during its own vibration, so as to balance the vibration deviation. In order to avoid the interference of the self-gravity of the balancing member 400 on its tiny vibration, in the specific implementation process, the balancing portion 420 is an arc-shaped structure protruding in a direction away from the diaphragm 200.

[0037] To cooperate with the balancing member 400 and the voice coil 300 to achieve better acoustic performance, the housing 100 adopts a split structure. Specifically, referring to Figure 3 and Figure 4 As shown, in an embodiment, the housing 100 includes a first housing 110 and a second housing 120, and the first housing 110 and the second housing 120 are stacked along the axial direction, and the first housing 110 and the second housing 120 are respectively connected to the balancing member 400.

[0038] In this embodiment, the housing 100 adopts a split structure assembled by the first housing 110 and the second housing 120. Taking the direction away from the voice coil 300 of the diaphragm 200 as the upper side, in this way, the bottom surface of the first housing 110 is fixedly connected to the top surface of the second housing 120, such as by bonding or other means. The balancing member 400 is fixedly connected to the surfaces of the first housing 110 and the second housing 120 facing each other. Specifically, the second connecting portion 430 of the balancing member 400 is attached to the first housing 110, and then the second housing 120 is assembled. The balancing member 400 is clamped between the first housing 110 and the second housing 120. In this way, the split housing 100 can facilitate the assembly of the balancing member 400.

[0039] To facilitate the assembly of the housing 100, in an embodiment, one of the first housing 110 and the second housing 120 is provided with a positioning convex portion 130, and the other is provided with a positioning concave portion 140. The positioning convex portion 130 is fitted and received in the positioning concave portion 140, and one end of the balancing member 400 is fixedly provided in the positioning concave portion 140. In this way, by inserting the positioning convex portion 130 into the positioning concave portion 140, it is convenient for the installation and positioning of the first housing 110 and the second housing 120, and the assembly efficiency is improved. In the specific implementation process, a plurality of positioning concave portions 140 are arranged at intervals along the circumferential direction of the first housing 110, and correspondingly, a plurality of positioning convex portions 130 are arranged at intervals along the circumferential direction of the second housing 120. It can be understood that when the first housing 110 and the second housing 120 are assembled, the portion between the two positioning concave portions 140 is received in the space between the two positioning convex portions 130 to ensure the sealing performance after the first housing 110 and the second housing 120 are assembled.

[0040] Further, each positioning recess 140 is correspondingly provided with a balancing member 400. In the specific implementation process, the positioning recess 140 can also be used for the installation and positioning of the balancing member 400. Specifically, the second connecting portion 430 of the balancing member 400 is bonded to the inner wall of the positioning recess 140, and then the second housing 120 is assembled to achieve the positioning of the balancing member 400, thereby improving the assembly efficiency of the balancing member 400.

[0041] Reference Figure 1 and Figure 5 As shown in the figure, in an embodiment, the micro speaker further includes a magnetic circuit system 500. The magnetic circuit system 500 includes a magnet 510 and a magnetic conductive bowl. The magnet 510 is disposed inside the magnetic conductive bowl, and a magnetic gap is formed between the outer peripheral wall of the magnet 510 and the inner side wall of the magnetic conductive bowl. At least a part of the voice coil 300 is sleeved on the outer periphery of the magnet 510 and is located in the magnetic gap, and the magnetic conductive bowl is connected to the housing 100.

[0042] It can be understood that after the voice coil 300 is energized and cooperates with the magnetic circuit system 500, vibration is generated, thereby driving the vibration of the diaphragm 200. The magnetic conductive bowl has a bottom and a bowl side wall. The magnet 510 is located inside the magnetic conductive bowl and in the space surrounded by the voice coil 300, and is fixedly connected to the bottom of the magnetic conductive bowl. There is a certain interval space between the magnet 510 and the bowl side wall of the magnetic conductive bowl, and the interval space forms a magnetic gap. A part of the voice coil 300 is located in the magnetic gap, and the magnetic field formed by the magnetic circuit system 500 is utilized. The outer wall of the magnetic conductive bowl near the bottom is fixedly connected to the second housing 120 of the housing 100 to install the magnetic circuit system 500 in the cavity. In addition, in the specific implementation process, the magnet 510 adopts a high-performance permanent magnet 510, such as a neodymium iron boron magnet 510 with a high magnetic energy product, to optimize the magnetic field distribution, provide a more uniform and stronger magnetic field for the voice coil 300, make the driving force received by the voice coil 300 more consistent at different positions, further ensure the smoothness of the vibration of the diaphragm 200, and improve the sensitivity and efficiency of the speaker.

[0043] Further, as shown in reference Figure 4 A positioning groove 150 is opened at one end of the housing 100 away from the diaphragm 200. The magnetic conductive bowl protrudes and is provided with a positioning block 530. The positioning groove 150 is used to accommodate the positioning block 530. In the specific implementation process, the positioning block 530 is disposed on the side wall of the magnetic conductive bowl near the bottom and extends in the radial direction. A positioning groove 150 is opened at the inner wall of the second housing 120 of the housing 100 and near its bottom, and the positioning groove 150 also extends out of the bottom surface of the second housing 120. When the magnetic conductive bowl is installed, the positioning block 530 is located in the positioning groove 150 to play a role of positioning and limiting, and improve the installation efficiency.

[0044] Reference Figure 4 and Figure 5As shown, in one embodiment, the magnetic circuit system 500 is also optimized to cooperate with the balance member 400 to avoid interference and affect the auxiliary vibration of the balance member 400. In this embodiment, the side wall of the magnetic bowl 520 is provided with a avoidance opening 521 corresponding to the balance member 400 to avoid the balance member 400. Based on the above, the avoidance opening 521 is provided on the side wall of the magnetic bowl and penetrates the side wall of the bowl. One end of the balance member 400 extends into the magnetic bowl through the avoidance opening 521 and is connected to the voice coil 300. The other end of the balance member 400 extends to the outside of the magnetic bowl through the avoidance opening 521 and is connected to the housing 100. It should be noted that in order to avoid the magnetic bowl from interfering with the vibration of the balance member 400, in the specific implementation process, the size of the avoidance opening 521 needs to ensure that the magnetic bowl does not contact the balance member 400, and in order to facilitate the installation of the balance member 400, the avoidance opening 521 extends to the top surface of the magnetic bowl.

[0045] In one embodiment, the magnetic circuit system 500 further includes a magnetic plate 550 and a magnetic ring 560. The magnetic plate 550 is disposed on the surface of the magnet 510 facing the diaphragm 200, and the magnetic ring 560 is disposed on the surface of the porcelain bowl facing the diaphragm 200, and the magnetic ring 560 is also fixedly connected to the housing 100. In the specific implementation process, the magnetic plate 550 is used to optimize the magnetic field distribution, improve the utilization rate of the magnetic field, and enhance the driving force of the voice coil 300. The magnetic plate 550 is fixed on the top surface of the magnet 510, and the magnetic ring 560 is located on the top surface of the bowl side wall of the porcelain bowl.

[0046] Further, refer to Figure 1 As shown, a limiting ring 160 is provided on the inner wall of the housing 100, and a magnetic conductive ring 560 is provided on the side of the limiting ring 160 away from the diaphragm 200. In order to improve the strength of the limiting ring 160, in the specific implementation process, the limiting ring 160 is integrally formed with the housing 100, the limiting ring 160 is located on the inner wall of the cavity, and the magnetic conductive ring 560 contacts the bottom surface of the limiting ring 160 to play the role of limiting and positioning.

[0047] In one embodiment, a through hole 540 communicating with the magnetic gap is provided at the bottom of the magnetic bowl. The through hole 540 can ensure that the cavity is connected with the outside world to prevent the air pressure of the cavity from affecting the vibration of the diaphragm 200 .

[0048] A sound absorbing member (not shown) is provided in the magnetic gap, and the sound absorbing member is provided between the voice coil 300 and the bottom of the magnetic bowl. In the specific implementation process, the sound absorbing member can be made of sound absorbing cotton and is provided in the magnetic gap to absorb the sound wave energy in the cavity and reduce the intensity of the reflected sound.

[0049] The above are only exemplary embodiments of the present invention, and thus do not limit the patent scope of the present invention. Any equivalent structural transformation made by using the content of the specification and drawings of the present invention under the inventive concept of the present invention, or any direct / indirect application in other related technical fields is included in the patent protection scope of the present invention.

Claims

1. A micro speaker, characterized in that, include: A shell with a cavity formed inside; a diaphragm connected to the housing and generating sound waves by vibrating; A voice coil is disposed in the cavity, and one end of the voice coil is fixedly connected to the diaphragm and drives the diaphragm to vibrate; as well as The balance member is arranged at one end of the voice coil away from the diaphragm and connects the housing and the voice coil. The voice coil drives the balance member to vibrate in the same direction or in the opposite direction relative to the diaphragm to absorb the vibration deviation of the diaphragm.

2. The micro speaker according to claim 1, wherein The material configuration of the balance piece is one of PO, PPE and silicone.

3. The micro speaker according to claim 2, characterized in that, The balancing member includes a first connecting part, a balancing part, and a second connecting part, wherein one end of the balancing part is connected to the first connecting part and the other end is connected to the second connecting part, the first connecting part is connected to the voice coil, and the second connecting part is connected to the housing.

4. The micro-speaker according to claim 3, characterized in that, The balancing portion is arranged in an arc shape.

5. The micro speaker according to claim 1, wherein, The housing includes a first shell and a second shell, and the first shell and the second shell are stacked along an axial direction, and the first shell and the second shell are respectively connected to the balance member.

6. The micro-speaker according to claim 5, characterized in that, One of the first shell and the second shell is provided with a positioning protrusion, and the other is provided with a positioning recess. The positioning protrusion is accommodated in the positioning recess, and one end of the balance member is fixedly arranged in the positioning recess.

7. The micro-speaker according to claim 6, wherein, Each of the positioning recesses is correspondingly provided with a balancing piece.

8. The micro-speaker according to claim 1, characterized in that, The miniature speaker also includes a magnetic circuit system, which includes a magnet and a magnetic bowl. The magnet is arranged in the magnetic bowl, and the outer wall of the magnet and the inner wall of the magnetic bowl form a magnetic gap. The voice coil is at least partially arranged on the outer periphery of the magnet and is located in the magnetic gap. The magnetic bowl is connected to the outer shell.

9. The micro speaker according to claim 8, wherein, The side wall of the magnetic bowl is provided with an escape opening corresponding to the balancing member, so as to avoid the balancing member.

10. The micro speaker according to claim 8, characterized in that, A positioning groove is formed at one end of the housing away from the diaphragm, a positioning block is protruded from the magnetic bowl, and the positioning groove is used to accommodate the positioning block; and / or, A through hole communicating with the magnetic gap is provided at the bottom of the magnetic bowl; and / or, A sound absorbing component is arranged in the magnetic gap, and the sound absorbing component is arranged between the voice coil and the bottom of the magnetic bowl.

11. The micro speaker according to claim 8, wherein, The magnetic circuit system also includes a magnetic conductive plate and a magnetic conductive ring. The magnetic conductive plate is arranged on the surface of the magnet facing the diaphragm, and the magnetic conductive ring is arranged on the surface of the porcelain bowl facing the diaphragm. The magnetic conductive ring is also fixedly connected to the shell.

12. The micro speaker according to claim 11, wherein A limiting ring is arranged on the inner wall of the shell, and the magnetic conductive ring is arranged on a side of the limiting ring away from the diaphragm.

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