Micro-speaker

Abstract

The application discloses a micro loudspeaker, which comprises a diaphragm assembly, an auxiliary voice coil and a plurality of working voice coils; the number of the auxiliary voice coils is less than the number of the working voice coils; the auxiliary voice coils are connected with the working voice coils and the diaphragm assembly respectively, the auxiliary voice coils are arranged in a staggered mode with the working voice coils, adjacent edges of two adjacent working voice coils and the diaphragm assembly form a first air flow channel which communicates the inner cavities of the two adjacent working voice coils, and the part of the working voice coil which is located outside the auxiliary voice coil and the diaphragm assembly form a second air flow channel which communicates the inner cavity of the working voice coil and the outside space. The auxiliary voice coils are arranged in a staggered mode with the working voice coils to form the first air flow channel and the second air flow channel, thereby effectively improving the smoothness of the air flow exchange between the inner cavities of the working voice coils and the outside space, and the high-frequency sensitivity of the micro loudspeaker is 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 micro speaker is widely used in portable electronic devices such as mobile phones, notebook computers, hearing aids, etc. With the rapid development of these portable electronic devices, the performance requirements of the micro speaker applied thereto are becoming higher and higher.

[0003] In order to improve the performance of the micro speaker, the prior art begins to adopt a multi-coil design. At the same time, in order to make the working coil located in the magnetic gap more suitable, some micro speakers will add an auxiliary coil between the working coil and the diaphragm assembly (the working coil is powered on when the micro speaker is working, and the auxiliary coil is not powered on). By adjusting the height of the auxiliary coil, the position of the working coil in the magnetic gap is adjusted, so that the performance of the micro speaker is further improved.

[0004] Currently, in the micro speaker with a multi-coil structure, the working coil and the auxiliary coil are generally arranged one by one. The connection area of the working coil and the diaphragm assembly is a closed annular area, which causes the inner cavity of the working coil to only form an opening at the bottom to exchange air with the space outside the working coil, thereby affecting the high-frequency sensitivity of the micro speaker. Moreover, the addition of the auxiliary coil further increases the height of the inner cavity of the working coil, which increases the overall volume of the inner cavity of the working coil, making the air exchange inside the micro speaker more difficult and further deteriorating the high-frequency sensitivity of the micro speaker. SUMMARY

[0005] The technical problem solved by the present application is to provide a micro speaker with high high-frequency sensitivity.

[0006] To solve the above technical problems, the technical scheme adopted by the present application is as follows: a micro speaker comprises:

[0007] a diaphragm assembly;

[0008] a plurality of working coils;

[0009] an auxiliary coil, the number of the auxiliary coil being less than the number of the working coils;

[0010] the auxiliary coil is connected to the working coil and the diaphragm assembly, respectively, the auxiliary coil is arranged in a staggered manner with the working coil, and the adjacent edges of the adjacent two working coils and the diaphragm assembly form a first air flow channel connecting the inner cavities of the adjacent two working coils, and the part of the working coil located outside the auxiliary coil and the diaphragm assembly form a second air flow channel connecting the inner cavity of the working coil and the outside space.

[0011] The present application has the advantages of:

[0012] The micro speaker has simple structure, the number of auxiliary voice coils is less than the number of working voice coils, and the reduction of the number of auxiliary voice coils can reduce the raw material cost of components of the micro speaker, and can also reduce the manufacturing process of the micro speaker, thereby reducing the assembly cost of the micro speaker. The reduction of the number of auxiliary voice coils can also reduce the overall weight of the vibration assembly, thereby improving the sensitivity of the micro speaker.

[0013] The auxiliary voice coil and the working voice coil are arranged in a staggered manner to form the first air flow channel and the second air flow channel, so that the inner cavity of the working voice coil can not only exchange air flow with the outer space through the lower opening, but also exchange air flow with the outer space through the second air flow channel at the upper portion, thereby effectively improving the smoothness of air flow exchange between the inner cavity of the working voice coil and the outer space, and improving the high-frequency sensitivity of the micro speaker. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from the structures shown in the drawings without creative labor.

[0015] Figure 1 is a top view of the micro speaker of the first embodiment of the present application;

[0016] Figure 2 is a sectional view along line A-A in the Figure 1

[0017] Figure 3 is a sectional view along line B-B in the Figure 1

[0018] Figure 4 is a structural schematic view of the combined voice coil in the micro speaker of the first embodiment of the present application;

[0019] Figure 5 is a structural schematic view of the combined voice coil in the micro speaker of the second embodiment of the present application;

[0020] Figure 6 is a sectional view of the micro speaker of the third embodiment of the present application;

[0021] Figure 7 is a structural schematic view of the combined voice coil in the micro speaker of the third embodiment of the present application;

[0022] Figure 8 ​​Fig. 4 is a structural schematic diagram of a combined voice coil in a micro-speaker according to the fourth embodiment of the present application;

[0023] Figure 9 Fig. 5 is a structural schematic diagram of a combined voice coil in a micro-speaker according to the fifth embodiment of the present application.

[0024] BRIEF DESCRIPTION OF THE DRAWINGS

[0025] 1, a yoke;

[0026] 2, a magnetic circuit assembly; 21, a magnetic gap; 22, a clearance groove;

[0027] 3, a diaphragm assembly;

[0028] 4, a combined voice coil; 41, an auxiliary voice coil; 42, a working voice coil;

[0029] 51, a first air flow channel; 52, a second air flow channel. DETAILED DESCRIPTION

[0030] The purposes, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings.

[0031] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0032] 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 positional relationship, movement condition, etc. between the components in a certain specific posture such as shown in the accompanying drawings. If the specific posture changes, the directionality indications also change accordingly.

[0033] In addition, if the embodiments of the present application involve descriptions such as "first", "second", etc., the descriptions of "first", "second", etc. are only for description purposes, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features with "first", "second" can explicitly or implicitly include at least one of the features.

[0034] In addition, the meaning of "and / or" appearing in the full text is that three parallel solutions are included, for example, "and / or" includes solutions, or solutions, or solutions that satisfy both. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor within the scope of protection required by the present application.

[0035] In the present application, unless otherwise expressly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, 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 ordinary skilled in the art, the specific meaning of the above-mentioned terms in the present application can be understood according to the specific circumstances.

[0036] Embodiment one

[0037] Please refer to Figures 1 to 4 The embodiment one of the present application is: a micro loudspeaker, which can be applied to electronic devices such as mobile phones, notebook computers, hearing aids, etc.

[0038] The micro loudspeaker comprises a frame 1 and a magnetic circuit assembly 2 and a vibration assembly connected to the frame 1, respectively, the vibration assembly comprises a diaphragm assembly 3 and a combined voice coil 4 connected to each other, the combined voice coil 4 comprises an auxiliary voice coil 41 and a plurality of working voice coils 42, the magnetic circuit assembly 2 has a magnetic gap 21 for the working voice coil 42 to move, the number of auxiliary voice coils 41 is less than the number of working voice coils 42; the auxiliary voice coil 41 is connected to the working voice coil 42 and the diaphragm assembly 3, respectively, the auxiliary voice coil 41 and the working voice coil 42 are arranged in a staggered manner, the adjacent edges of two adjacent working voice coils 42 and the diaphragm assembly 3 form a first air flow channel 51 connecting the inner cavities of the two adjacent working voice coils 42, and the part of the working voice coil 42 located outside the auxiliary voice coil 41 and the diaphragm assembly 3 form a second air flow channel 52 connecting the inner cavity of the working voice coil 42 and the outer space.

[0039] To avoid the auxiliary voice coil 41 from colliding with the magnetic circuit assembly 2 when the micro speaker is working, optionally, the top of the magnetic circuit assembly 2 is provided with an avoiding slot 22 for avoiding the auxiliary voice coil 41. Specifically, the magnetic circuit assembly 2 includes a yoke, a center magnetic structure and a side magnetic structure, the center magnetic structure and the side magnetic structure are respectively arranged on the yoke, and the center magnetic structure and the side magnetic structure form part of the magnetic gap 21, and the avoiding slot 22 is arranged on the side of the center magnetic structure away from the yoke, i.e. the avoiding slot 22 is arranged on the top of the center magnetic structure. More specifically, the center magnetic structure includes a center magnetic steel and a center dust shield, the center magnetic steel is connected to the center dust shield and the yoke respectively, and the avoiding slot 22 is arranged on the top surface of the center dust shield.

[0040] To balance the force of the vibration assembly and improve the polarization phenomenon of the working voice coil 42, preferably, the combined voice coil 4 formed by the auxiliary voice coil 41 and the working voice coil 42 is an axisymmetric structure, in this embodiment, the combined voice coil 4 is formed by other structural members in the vibration assembly except the diaphragm assembly 3.

[0041] At least one group of two adjacent working voice coils 42 contact each other, and / or at least one group of two adjacent working voice coils 42 has a gap. In this embodiment, the number of working voice coils 42 is two, the number of auxiliary voice coils 41 is one, two working voice coils 42 contact each other, and preferably two working voice coils 42 are connected and fixed to each other, which is conducive to further improving the polarization phenomenon of the working voice coil 42 and ensuring the performance of the micro speaker. There are many specific measures for connecting and fixing two working voice coils 42 to each other, such as connecting by glue, connecting by double-sided adhesive tape, connecting by the self-adhesive layer of the enameled wire used to wind the working voice coil 42, etc. Similarly, the working voice coil 42 and the auxiliary voice coil 41 can be connected by glue, double-sided adhesive tape, the self-adhesive layer of the enameled wire, or other ways.

[0042] The wall thickness of the auxiliary voice coil 41 is less than or equal to the wall thickness of the working voice coil 42, to control the weight of the auxiliary voice coil 41, preferably, the wall thickness of the auxiliary voice coil 41 is less than the wall thickness of the working voice coil 42. Of course, in some embodiments, the wall thickness of the auxiliary voice coil 41 can be greater than the wall thickness of the working voice coil 42.

[0043] The auxiliary voice coil 41 is wound by a first wire, the working voice coil 42 is wound by a second wire, the material density of the first wire is less than or equal to the material density of the second wire. In order to control the weight of the auxiliary voice coil 41 and reduce the overall weight of the vibration assembly, preferably the material density of the first wire is less than the material density of the second wire. The first wire can be a copper-clad aluminum wire, an aluminum wire, etc.

[0044] The cross-sectional shape of the first wire and the cross-sectional shape of the second wire can be the same or different, the cross-sectional shape of the first wire can be circular, oval, polygonal or other special-shaped, and the cross-sectional shape of the second wire is the same. The cross-sectional size of the first wire and the cross-sectional size of the second wire can be the same or different.

[0045] In order to improve the bonding strength of the auxiliary voice coil 41 and the working voice coil 42, optionally, a fitting structure is formed at the bonding surface of the auxiliary voice coil 41 and the working voice coil 42. In this way, the fixing area between the auxiliary voice coil 41 and the working voice coil 42 can be increased, and the fixing effect can be enhanced. For example, the working voice coil 42 and the auxiliary voice coil 41 at the bonding surface can be a stepped structure, and the two are fixed together.

[0046] Embodiment two

[0047] Please refer to Figure 5 The embodiment two of the present application is a parallel technical solution of the embodiment one, which is different from the embodiment one in that the two working voice coils 42 have a gap.

[0048] Embodiment three

[0049] Please refer to Figure 6 and Figure 7 The embodiment three of the present application is a parallel technical solution of the embodiment one, which is different from the embodiment one in that the number of working voice coils 42 is three and the number of auxiliary voice coils 41 is two.

[0050] When the number of working voice coils 42 is greater than or equal to three and the number of auxiliary voice coils 41 is greater than or equal to two, at least one group of adjacent two auxiliary voice coils 41 contact each other, and / or at least one group of adjacent two auxiliary voice coils 41 has a gap.

[0051] In the embodiment, the two auxiliary voice coils 41 are in contact with each other, and preferably, the two auxiliary voice coils 41 are fixedly connected with each other, which is beneficial to further improve the polarization phenomenon of the working voice coil 42, thereby ensuring the performance of the micro speaker. There are many specific measures for fixedly connecting the two adjacent auxiliary voice coils 41 with each other, for example, connecting through glue, connecting through double-sided adhesive paper, connecting through the self-adhesive layer of the enameled wire for winding the auxiliary voice coil 41, or connecting through other ways, etc.

[0052] Embodiment four

[0053] Please refer to Figure 8 The embodiment four of the present application is a parallel technical solution of the embodiment three, and the difference between the embodiment four and the embodiment three is that the number of the working voice coils 42 is four, and the number of the auxiliary voice coils 41 is two.

[0054] In the embodiment, the two auxiliary voice coils 41 have a gap therebetween, and in other embodiments, the two auxiliary voice coils 41 can also be in contact with each other.

[0055] Embodiment five

[0056] Please refer to Figure 9 The embodiment five of the present application is a parallel technical solution of the embodiment four, and the difference between the embodiment five and the embodiment four is that the number of the working voice coils 42 is four, and the number of the auxiliary voice coils 41 is three.

[0057] 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 directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present application.

Claims

1. A microspeaker, characterized by: The diaphragm assembly includes a plurality of working voice coils; a plurality of auxiliary voice coils, the number of auxiliary voice coils being less than the number of working voice coils; the auxiliary voice coils are connected to the working voice coils and the diaphragm assembly respectively, the auxiliary voice coils are arranged in a staggered manner with the working voice coils, the adjacent edges of two adjacent working voice coils and the diaphragm assembly form a first air flow channel connecting the inner cavities of the two adjacent working voice coils, and the part of the working voice coil outside the auxiliary voice coil and the diaphragm assembly form a second air flow channel connecting the inner cavity of the working voice coil and the outer space. It also includes a magnetic circuit assembly having a magnetic gap for the working voice coil to move in, and the top of the magnetic circuit assembly is provided with a relief groove for avoiding the auxiliary voice coil.

2. The microspeaker of claim 1, wherein: The combined voice coil formed by the auxiliary voice coil and the working voice coil is an axisymmetric structure.

3. The micro speaker of claim 1, wherein: At least one group of two adjacent working voice coils are in contact with each other, and / or at least one group of two adjacent working voice coils have a gap therebetween.

4. The microspeaker of claim 1, wherein: The number of working voice coils is two, and the number of auxiliary voice coils is one.

5. The microspeaker of claim 1, wherein: The number of working voice coils is greater than or equal to three, and the number of auxiliary voice coils is greater than or equal to two, at least one group of two adjacent auxiliary voice coils are in contact with each other, and / or at least one group of two adjacent auxiliary voice coils have a gap therebetween.

6. The microspeaker of claim 1, wherein: The number of working voice coils is three, and the number of auxiliary voice coils is two.

7. The microspeaker of claim 6, wherein: The number of working voice coils is four, and the number of auxiliary voice coils is two or three.

8. The microspeaker of claim 6, wherein: The auxiliary voice coil is wound by a first wire, and the working voice coil is wound by a second wire, the material density of the first wire is less than or equal to the material density of the second wire.

9. The microspeaker of claim 1, wherein: The combination surface of the auxiliary voice coil and the working voice coil forms a fitting structure.

10. The microspeaker of claim 1, wherein: ​

Images