Micro-speaker

Abstract

The present application discloses a micro loudspeaker, which comprises a diaphragm assembly and a plurality of voice coils connected to the diaphragm assembly, and the weights of at least two of the voice coils are different. In the micro loudspeaker, the weights of at least two of the voice coils are different, so that the resonance frequency of the voice coil & dome assembly is far away from the resonance frequency of the micro loudspeaker itself, the different vibration amplitudes between the voice coils are reduced, and the problems of distortion and poor sound quality of the micro loudspeaker are improved, and the reliability and service life of the micro loudspeaker are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electro-acoustic transducer, in particular to a micro speaker. BACKGROUND

[0002] The effect, especially loudness, of the micro speaker depends on its energy density, and the multi-coil architecture is an effective way to improve the energy density. In particular, the multi-coil architecture can better improve the efficiency of the magnetic field and improve the loudness in the micro speaker used in thin and light electronic products such as tablets, laptops, and mobile phones.

[0003] The coil & dome assembly composed of multiple coils and a dome in the multi-coil architecture has inherent resonance. A significant problem of the existing micro speaker with the multi-coil architecture is that the resonance frequency of the inherent resonance of the coil & dome assembly is relatively close to the overall resonance frequency of the micro speaker, which brings greater amplitude of the inherent resonance of the coil & dome assembly, and at the same time, causes the vibration displacement of the multiple coils to be seriously inconsistent (commonly known as flapping wings or fanning wings), resulting in distortion and sound quality problems, and even reliability problems, affecting the service life of the speaker.

[0004] This problem can be alleviated to some extent by controlling the material and thickness of the dome, but the micro speaker has the requirement of thin and light, and it is difficult to use a thicker dome. At the same time, the dome material is also limited at the present stage, so this problem still restricts the development, design, and production of the micro speaker with the multi-coil architecture. SUMMARY

[0005] The main purpose of the present application is to provide a new micro speaker with a multi-coil architecture, which aims to solve the problem of poor reliability and acoustic performance of the existing micro speaker with the multi-coil architecture.

[0006] In order to solve the above technical problems, the technical scheme adopted by the present application is as follows: a micro speaker, comprising:

[0007] a diaphragm assembly;

[0008] a plurality of coils, the coils being connected to the diaphragm assembly, and the weights of at least two of the coils being different.

[0009] The beneficial effects of the present application are as follows: in the present micro speaker, the weights of at least two coils are different, so that the resonance frequency of the coil & dome assembly is far away from the resonance frequency of the micro speaker itself, reducing the out-of-sync vibration amplitude between the coils, which is beneficial to improve the distortion, poor sound quality, and other problems of the micro speaker, and improve the reliability and service life of the micro speaker. BRIEF DESCRIPTION OF DRAWINGS

[0010] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings described below only show some of the embodiments of the present application, and all other drawings obtained by those of ordinary skill in the art without creative effort based on these drawings also belong to the protection scope of the present application.

[0011] Figure 1 The exploded view of the micro speaker of the first embodiment of the present application;

[0012] Figure 2 The sectional view of the micro speaker of the first embodiment of the present application;

[0013] Figure 3 The structural schematic diagram of the internal structure of the micro speaker of the first embodiment of the present application;

[0014] Figure 4 The structural schematic diagram of the internal structure of the micro speaker of the second embodiment of the present application.

[0015] Explanation of the reference signs:

[0016] 1, the basin frame;

[0017] 2, the diaphragm assembly; 21, the sound film; 22, the ball top;

[0018] 31, the first voice coil; 32, the second voice coil;

[0019] 41, the yoke; 42, the first center magnetic structure; 43, the second center magnetic structure; 44, the side magnetic structure. DETAILED DESCRIPTION

[0020] The purposes, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings.

[0021] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort belong to the protection scope of the present application.

[0022] It should be noted that if the embodiments of the present application involve directionality indications such as up, down, left, right, front, back, etc., the directionality indications are only used to explain the relative position relationship, movement condition, etc. between the components in a certain specific posture such as shown in the drawings. If the specific posture changes, the directionality indications also change accordingly.

[0023] In addition, if the description of "first", "second" and the like is involved in the embodiments of the present application, the description of "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can be explicitly or implicitly included at least one of the features.

[0024] In addition, the meaning of "and / or" appearing throughout the text is that it includes three parallel schemes. For example, "and / or" includes the scheme, or the scheme, or the scheme that satisfies both. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the fact that a person skilled in the art can realize it. When the combination of technical solutions contradicts each other or cannot be realized, it should be considered that the combination of technical solutions does not exist and is not within the protection scope required by the present application.

[0025] In this application, unless otherwise clearly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above-mentioned terms in this application can be understood according to the specific circumstances.

[0026] Embodiment one

[0027] Please refer to Figures 1 to 3 The embodiment one of the present application is: a micro loudspeaker, which can be applied to electronic devices such as tablet computers, notebook computers, mobile phones and the like.

[0028] The micro loudspeaker comprises a basket 1 and a vibration assembly and a magnetic circuit assembly connected to the basket 1 respectively, the vibration assembly comprises a diaphragm assembly 2 and a plurality of voice coils connected to the diaphragm assembly 2, the voice coils are connected to the diaphragm assembly 2, and the weights of at least two of the voice coils are different; the magnetic circuit assembly has a magnetic gap for the voice coils to move. Specifically, the diaphragm assembly 2 comprises a sound film 21 and a ball top 22 connected to the sound film 21, and the voice coils are connected to the ball top 22.

[0029] Preferably, the wire densities of the two voice coils with different weights are different, and the wire density of the voice coil refers to the material density of the wire itself used for winding the voice coil. By changing the wire density, the weight of the voice coil can be increased or decreased without changing the size of the voice coil. Further preferably, in the two voice coils with different weights, the wire density of the voice coil with a larger weight is greater than the wire density of the voice coil with a smaller weight.

[0030] The number of voice coils is greater than or equal to three, and the three voice coils are arranged in a row. Among two adjacent voice coils, the voice coil closer to the center of the diaphragm assembly 2 has a greater wire density than the voice coil farther from the center of the diaphragm assembly 2.

[0031] In two adjacent voice coils, the weight of the voice coil closer to the center of the diaphragm assembly 2 is A, and the weight of the voice coil farther from the center of the diaphragm assembly 2 is B, where B < A ≤ 50B, and both A and B are positive numbers. A ≤ 50B means that the value of A is less than or equal to 50 times the value of B.

[0032] In this embodiment, the number of voice coils is three. Optionally, the voice coil in the middle is the first voice coil 31, which is made of copper wire or copper-silver alloy wire. The voice coils on both sides are the second voice coils 32, which are made of aluminum wire or copper-aluminum alloy wire. Preferably, the voice coils on both sides are made of the same material, that is, the two second voice coils 32 are made of the same material; in other embodiments, the two second voice coils 32 can also be made of different materials.

[0033] To further improve the performance of the miniature loudspeaker, the temperature rise coefficients of the wire used to wind the first voice coil 31 and the wire used to wind the second voice coil 32 are similar. Preferably, the first voice coil 31 is made of copper wire, and the second voice coil 32 is made of copper-aluminum alloy wire.

[0034] Specifically, the magnetic circuit assembly includes a yoke 41 and a central magnetic structure and a side magnetic structure 44 respectively disposed on the yoke 41. The side magnetic structure 44 is arranged around the central magnetic structure. The central magnetic structure includes three first central magnetic structures 42 and two second central magnetic structures 43. The three first central magnetic structures 42 are arranged in a row, and a second central magnetic structure 43 is disposed between two adjacent first central magnetic structures 42. A portion of the magnetic gap is formed between the first central magnetic structure 42 and the second central magnetic structure 43, and another portion of the magnetic gap is formed between the first central magnetic structure 42 and the side magnetic structure 44. The first central magnetic structure 42 includes a first central magnet and a first central washer. The first central magnet connects the first central washer to the yoke 41. The second central magnetic structure 43 includes a second central magnet and a second central washer. The second central magnet connects the second central washer to the yoke 41.

[0035] The applicant conducted the following experiment:

[0036] Control group: The first and second voice coils were made of the same wire, with the first voice coil weighing 200mg and the second voice coil weighing 100mg.

[0037] Experimental group: the wire density of the first voice coil is greater than the material density of the second voice coil, the weight of the first voice coil is 300 mg, and the weight of the second voice coil is 50 mg.

[0038] The simulation results are shown in Table 1

[0039] Table 1 Comparison of experimental results of experimental group and control group

[0040]

[0041]

[0042] From Table 1, it can be seen that the beat wing frequency of the voice coil with unequal weight / unequal wire density design is higher, which is beneficial to moving away from the existing f0 design interval of the micro speaker, and helps to improve the acoustic effect and reduce the reliability risk.

[0043] Embodiment two

[0044] Please refer to Figure 4 Embodiment two of the present application is: a micro speaker, which can be applied to electronic devices such as tablet computers, notebook computers, mobile phones and the like.

[0045] The micro speaker comprises a basket 1 and a vibration assembly and a magnetic circuit assembly connected to the basket 1 respectively, the vibration assembly comprises a diaphragm assembly and a plurality of voice coils connected to the diaphragm assembly, the voice coils are connected to the diaphragm assembly, and the weights of at least two of the voice coils are different; the magnetic circuit assembly has a magnetic gap for the voice coils to move in.

[0046] Preferably, the wire densities of the two voice coils with different weights are different, and the wire density of the voice coil refers to the material density of the wire itself used for winding the voice coil. By changing the wire density, the weight of the voice coil can be increased or decreased without changing the size of the voice coil. Further preferably, in the two voice coils with different weights, the wire density of the voice coil with a larger weight is greater than the wire density of the voice coil with a smaller weight.

[0047] The number of the voice coils is greater than or equal to two, the voice coils with a number greater than or equal to two are arranged in a coaxial ring, and in the two adjacent voice coils, the wire density of the voice coil located in the inner layer is less than the wire density of the voice coil located in the outer layer.

[0048] In the two adjacent voice coils, the weight of the voice coil located in the outer layer is C, and the weight of the voice coil located in the inner layer is D, D < C ≤ 50D, and C and D are positive numbers. C ≤ 50D means that the value of C is less than or equal to 50 times the value of D.

[0049] In the embodiment, the number of the voice coils is two, and the voice coil located at the outer layer is the first voice coil 31, the material of the first voice coil 31 is copper wire or copper-silver alloy wire, and the voice coil located at the inner layer is the second voice coil 32, the material of the second voice coil 32 is aluminum wire or copper-aluminum alloy wire.

[0050] To further improve the performance of the micro speaker, the temperature rise coefficient of the wire material for winding the first voice coil 31 is similar to that of the wire material for winding the second voice coil 32. Preferably, the second voice coil 32 is wound by copper wire, and the first voice coil 31 is wound by copper-aluminum alloy wire.

[0051] Specifically, the magnetic circuit assembly includes a yoke 41, a center magnetic structure and a side magnetic structure 44 arranged on the yoke 41 respectively, the side magnetic structure 44 is arranged around the center magnetic structure, the center magnetic structure includes a first center magnetic structure 42 and a second center magnetic structure 43 arranged around the first center magnetic structure 42, the first magnetic gap for the first voice coil 31 to move is formed between the second center magnetic structure 43 and the side magnetic structure 44, and the second magnetic gap for the second voice coil 32 to move is formed between the first center magnetic structure 42 and the second center magnetic structure 43. The first center magnetic structure 42 includes a first center magnetic steel and a first center dust core, the first center magnetic steel connects the first center dust core and the yoke 41; the second center magnetic structure 43 includes a second center magnetic steel and a second center dust core, the second center magnetic steel and the second center dust core are respectively in the form of ring frame, and the second center magnetic steel connects the second center dust core and the yoke 41.

[0052] Therefore, it is not difficult to see that the micro speaker of the embodiment is a coaxial speaker.

[0053] The applicant made the following experiments:

[0054] The control group: the first voice coil and the second voice coil are wound by the same wire material, the weight of the first voice coil is 100 mg, and the weight of the second voice coil is 50 mg.

[0055] The experimental group: the wire density of the first voice coil is greater than that of the second voice coil, the weight of the first voice coil is 200 mg, and the weight of the second voice coil is 50 mg.

[0056] The simulation results are shown in Table 2

[0057] Table 2 Comparison of experimental results of experimental group and control group

[0058] Modality Control group Experimental group 1st order - translation 580.73 Hz 602.21 Hz 2nd order - short side roll 769.95 Hz 801.08 Hz 3rd order - long side roll 785.21 Hz 816.92 Hz 4th order - long side flap 1334.24 Hz 1423.31 Hz 5th order - long side wave 1675.34 Hz 1754.32 Hz 6th order - diagonal distortion 1952.67 Hz 2286.65 Hz

[0059] From table 2, it can be seen that the beat wing frequency of the voice coil with unequal weight / unequal wire density design is higher, which is beneficial to moving away from the existing f0 design interval of the micro speaker, and helps to improve the acoustic effect and reduce the reliability risk.

[0060] The above is only an optional embodiment of the present application, and does not limit the patent scope of the present application, and any equivalent structural transformation made under the inventive concept of the present application, or direct / indirect application in other related technical fields is included in the patent protection scope of the present application.

Claims

1. A miniature loudspeaker, characterized in that: include Diaphragm assembly; Multiple voice coils connected to the diaphragm assembly, at least two of the voice coils having different weights; The number of voice coils is greater than or equal to three, and the three voice coils are arranged in a row. Among two adjacent voice coils, the voice coil closer to the center of the diaphragm assembly has a greater wire density than the voice coil farther from the center of the diaphragm assembly. Of the two voice coils with different weights, the voice coil with the larger weight has a higher wire density than the voice coil with the smaller weight.

2. The miniature loudspeaker according to claim 1, characterized in that: In two adjacent voice coils, the weight of the voice coil closer to the center of the diaphragm assembly is A, and the weight of the voice coil farther from the center of the diaphragm assembly is B, where B < A ≤ 50B, and both A and B are positive numbers.

3. The miniature loudspeaker according to claim 1, characterized in that: The voice coils are in the form of three, with the middle voice coil being made of copper wire or copper-silver alloy wire, and the voice coils on both sides being made of aluminum wire or copper-aluminum alloy wire.

4. The miniature loudspeaker according to claim 3, characterized in that: The voice coils located on both sides may be made of the same or different materials.

5. A miniature loudspeaker, characterized in that: It includes a diaphragm assembly and multiple voice coils connected to the diaphragm assembly, with at least two of the voice coils having different weights; The number of voice coils is greater than or equal to two, and the two voice coils are arranged in a coaxial ring. In two adjacent voice coils, the wire density of the inner voice coil is less than the wire density of the outer voice coil. In two adjacent voice coils, the weight of the outer voice coil is C, and the weight of the inner voice coil is D, where D < C ≤ 50D, and both C and D are positive numbers.

6. The miniature loudspeaker according to claim 5, characterized in that: The voice coils are of two types. The outer voice coil is made of copper wire or copper-silver alloy wire, while the inner voice coil is made of aluminum wire or copper-aluminum alloy wire.

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