Miniature loudspeaker

Abstract

The miniature loudspeaker comprises a magnetic circuit assembly, a voice coil and an auxiliary film, the magnetic circuit assembly comprises a yoke and a central magnetic structure arranged on the yoke, the central magnetic structure is provided with an avoiding groove, the two ends of the avoiding groove are respectively communicated with the outer wall surface of the central magnetic structure, the yoke is provided with a fixing table, and the fixing table is provided with a magnet. The fixing table is located in the avoiding groove. The voice coil is arranged corresponding to the central magnetic structure; the auxiliary film is arranged corresponding to the avoiding groove, and the auxiliary film is connected with the voice coil and the fixing table. The miniature loudspeaker is novel in structure, the auxiliary film is arranged on the inner side of the voice coil, the rolling vibration phenomenon of the miniature loudspeaker with a large voice coil framework under the working condition of large amplitude is effectively improved, the sound quality performance of the miniature loudspeaker is improved, and meanwhile, the edge magnetic structure on the outer side of the voice coil does not need to avoid the auxiliary film, so that the miniature loudspeaker is convenient to manufacture. The overall size of the edge magnetic structure can be set to be larger, so that the acoustic performance of the micro loudspeaker is improved to a greater extent.

Description

Technical Field

[0001] The utility model relates to the technical field of electroacoustic converters, in particular to a miniature loudspeaker. Background Art

[0002] In order to improve the performance of micro speakers, existing micro speakers mostly adopt large voice coils and large amplitude structure designs. However, when the voice coil of the micro speaker is enlarged, the space left outside the voice coil is not enough, and thus it is impossible to place a secondary membrane or other rolling vibration suppression structure. When the micro speaker vibrates with a large amplitude, rolling vibration and other situations are prone to occur, affecting the sound quality. Utility Model Content

[0003] The technical problem solved by the utility model is to provide a large-amplitude micro loudspeaker with good sound quality.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is: a micro speaker, comprising:

[0005] A magnetic circuit assembly, the magnetic circuit assembly comprising a yoke and a central magnetic structure arranged on the yoke, the central magnetic structure being provided with an avoidance groove, the two ends of the avoidance groove being respectively connected to the outer wall surface of the central magnetic structure, the yoke being provided with a fixing platform, and the fixing platform being located in the avoidance groove;

[0006] a voice coil, the voice coil being arranged corresponding to the central magnetic structure;

[0007] A secondary membrane, wherein the secondary membrane is arranged corresponding to the avoidance groove, and the secondary membrane connects the voice coil and the fixing platform.

[0008] In one embodiment, the number of the auxiliary films is multiple, and the multiple auxiliary films are divided into a plurality of groups with two as a group, and the two auxiliary films in the same group are centrally symmetrical.

[0009] In one embodiment, the connection between the auxiliary diaphragm and the voice coil is located at the long axis side, short axis side or corner of the voice coil.

[0010] In one embodiment, the auxiliary membrane includes an inner mounting portion, a folding ring portion and an outer mounting portion which are sequentially connected from the inside to the outside, the inner mounting portion is connected to the fixing platform, and at least one of the inner wall surface, the bottom surface and the outer wall surface of the voice coil is connected to the outer mounting portion.

[0011] In one embodiment, the avoidance groove communicates with the top surface and the bottom surface of the central magnetic structure, and the yoke is provided with an avoidance hole for avoiding the auxiliary film.

[0012] In one embodiment, a conductive circuit is provided on the secondary membrane, and the conductive circuit is electrically connected to the voice coil.

[0013] In one embodiment, the voice coil includes a connected body and a lead, the lead is arranged corresponding to the hollow area of ​​the body, the central magnetic structure is provided with a clearance groove for avoiding the lead, a partial area of ​​the lead is fixed on the fixing platform, and also includes a through hole, and the end of the lead away from the body passes through the bottom of the yoke through the through hole.

[0014] In one embodiment, when the micro speaker is viewed from a top-down perspective, the lead wire has no overlapping area with the auxiliary membrane.

[0015] In one embodiment, the fixing platform is a hollow convex bump formed by stamping a partial area of ​​the yoke.

[0016] In one embodiment, the secondary membrane includes a middle mounting portion, a folded ring structure and a side mounting portion, the middle mounting portion is fixed on the fixed platform, both ends of the middle mounting portion are respectively connected to the folded ring structure, one end of the folded ring structure away from the middle mounting portion is connected to the side mounting portion, and the side mounting portion is connected to the voice coil.

[0017] The beneficial effects of the present invention are as follows: the micro-speaker has a novel structure, and the auxiliary diaphragm is arranged on the inner side of the voice coil, which effectively improves the rolling vibration phenomenon that is easy to occur in the micro-speaker with a large voice coil structure under large amplitude conditions, and is beneficial to improving the sound quality performance of the micro-speaker. At the same time, since the side magnetic structure on the outer side of the voice coil does not need to avoid the auxiliary diaphragm, the overall volume of the side magnetic structure can be set larger, thereby greatly improving the acoustic performance of the micro-speaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0019] Figure 1 An exploded view of the micro speaker of the first embodiment of the utility model;

[0020] Figure 2 This is a schematic diagram of the internal structure of the micro speaker of the first embodiment of the utility model;

[0021] Figure 3 is a cross-sectional view of the micro-speaker of the first embodiment of the utility model;

[0022] Figure 4 A schematic diagram of the internal structure of a micro-speaker of another structure according to the first embodiment of the utility model;

[0023] Figure 5 is a cross-sectional view of a micro-speaker according to Embodiment 2 of the present utility model;

[0024] Figure 6 is a cross-sectional view of a micro-speaker according to Embodiment 3 of the present utility model;

[0025] Figure 7 This is a schematic diagram of the internal structure of a micro-speaker according to Embodiment 4 of the present utility model.

[0026] Description of Figure Numbers:

[0027] 1. Basin stand;

[0028] 2. Diaphragm assembly;

[0029] 3. Voice coil; 31. Body; 32. Lead wire; 321. Bend section;

[0030] 4. yoke; 41. fixing platform; 411. through hole;

[0031] 5. Central magnetic structure; 51. Avoidance slot; 52. Avoidance slot;

[0032] 6. Edge magnetic structure;

[0033] 7. Auxiliary film; 71. Inner mounting portion; 72. Folding ring portion; 73. Outer mounting portion; 74. Middle mounting portion; 75. Folding ring structure; 76. Side mounting portion;

[0034] 8. Fixing glue. DETAILED DESCRIPTION

[0035] The purpose, features and advantages of the present invention will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

[0036] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0037] It should be noted that if the embodiments of the present invention involve directional indications such as up, down, left, right, front, back, etc., then the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture as shown in the accompanying drawings. If the specific posture changes, the directional indication will also change accordingly.

[0038] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0039] In addition, if the meaning of "and / or" appears in the full text is to include three parallel solutions, taking "and / or" as an example, it includes solutions, or solutions, or solutions that are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory 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 this utility model.

[0040] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0041] Embodiment 1

[0042] Please refer to Figures 1 to 4 , Embodiment 1 of the present utility model is: Please combine Figures 1 to 3The micro speaker includes a basin frame 1, a vibration component magnetic circuit component and a secondary membrane 7, wherein the vibration component includes a diaphragm component 2 and a voice coil 3, wherein the diaphragm component 2 connects the basin frame 1 and the voice coil 3, and in this embodiment, the diaphragm component 2 includes a sound membrane and a ball top arranged on the sound membrane, and in other embodiments, the diaphragm component 2 may only have the sound membrane without the ball top, and the specific setting can be selected according to actual needs; the magnetic circuit component includes a yoke 4 and a central magnetic structure 5 and a side magnetic structure 6 respectively arranged on the yoke 4, and the central magnetic structure 5 is provided with a avoidance The avoidance groove 51, the two ends of which are respectively connected to the outer wall surface of the central magnetic structure 5, the yoke 4 is provided with a fixed platform 41, the fixed platform 41 is located in the avoidance groove 51, the side magnetic structure 6 is arranged around the central magnetic structure 5, the side magnetic structure 6 is connected to the basin frame 1, and a magnetic gap is formed between the side magnetic structure 6 and the central magnetic structure 5 for the movement of the voice coil 3. In other words, the voice coil 3 is arranged corresponding to the central magnetic structure 5; the auxiliary membrane 7 is arranged corresponding to the avoidance groove 51, and the auxiliary membrane 7 connects the voice coil 3 and the fixed platform 41.

[0043] The auxiliary membrane 7 includes an inner mounting portion 71, a folding ring portion 72 and an outer mounting portion 73 which are sequentially connected from the inside to the outside, the inner mounting portion 71 is connected to the fixing platform 41, and at least one of the inner wall surface, the bottom surface and the outer wall surface of the voice coil 3 is connected to the outer mounting portion 73. In this embodiment, the bottom surface of the voice coil 3 is connected to the outer mounting portion 73 by adhesive.

[0044] The auxiliary membrane 7 is a single-layer structure or a multi-layer composite structure, and can also be made of a polymer composite material.

[0045] Optionally, there are multiple auxiliary membranes 7, and the multiple auxiliary membranes 7 are divided into several groups with two as a group. The two auxiliary membranes 7 in the same group are centrally symmetrical, so that the traction force of the auxiliary membrane 7 on the vibration component is symmetrically balanced, avoiding the imbalance of the vibration component due to the influence of the traction force, and further causing rolling vibration.

[0046] The connection between the auxiliary membrane 7 and the voice coil 3 is located at the long axis side, short axis side or corner of the voice coil 3, and can be specifically set according to actual needs.

[0047] In order to fully avoid the auxiliary film 7, preferably, the avoidance groove 51 connects the top surface and the bottom surface of the central magnetic structure 5. In order to prevent the auxiliary film 7 from colliding with the yoke 4, optionally, the yoke 4 is provided with an avoidance hole for avoiding the auxiliary film 7. The avoidance hole can be either a blind hole or a through hole.

[0048] The central magnetic structure 5 includes a central magnetic steel and a central washer located above the central magnetic steel. The central magnetic steel connects the central washer and the yoke 4. The avoidance groove 51 extends from the top surface of the central washer toward the direction close to the yoke 4. In some products, it is also possible that the avoidance groove 51 is not connected to the bottom surface of the central magnetic steel. In this case, the assembly of the central magnetic steel and the yoke 4 can be facilitated.

[0049] The edge magnetic structure 6 includes an edge magnetic steel and an edge washer located above the edge magnetic steel, the edge magnetic steel connects the edge washer and the yoke 4, and the edge washer connects the basin frame 1. In other embodiments, the edge magnetic structure 6 can also be replaced by a flange formed by bending the edge area of ​​the yoke 4.

[0050] In this embodiment, the voice coil 3 includes a connected body 31 and a lead 32, the lead 32 is arranged corresponding to the hollow area of ​​the body 31, the central magnetic structure 5 is provided with a avoidance groove 52 for avoiding the lead 32, the avoidance groove 52 is connected to the avoidance groove 51, a part of the lead 32 is fixed on the fixing platform 41, and also includes a through hole 411, and the end of the lead 32 away from the body 31 passes through the bottom of the yoke 4 through the through hole 411. Optionally, a part of the lead 32 is fixed to the fixing platform 41 by a fixing glue 8. In order to facilitate the assembly of the micro speaker, it is preferred that the through hole 411 is connected to the top surface of the fixing platform 41, that is, the through hole 411 is arranged perpendicular to the yoke 4, and accordingly, the fixing glue 8 is arranged on the top surface of the fixing platform 41.

[0051] The voice coil 3 has at least two leads 32, one lead 32 is used to connect to the positive pole of the power supply, and the other lead 32 is used to connect to the negative pole of the power supply. The multiple leads 32 in the voice coil 3 are axially symmetrical or centrally symmetrical, so that the traction force of the lead 32 on the vibration component is symmetrically balanced, avoiding the vibration component being unbalanced due to the influence of the traction force, thereby causing rolling vibration. The connection between the lead 32 and the body 31 can be located on the short axis side of the body 31, on the long axis side of the body 31, or at the corner of the body 31.

[0052] Specifically, the lead wire 32 has at least one bending section 321, and the bending section 321 is located in the air-avoiding groove 52. During the vibration of the diaphragm assembly 2, the lead wire 32 will be deformed accordingly. It is easy to understand that the middle area of ​​the lead wire 32 is suspended in the air and does not contact the yoke 4. It should be noted that the number of the bending sections 321 can be one or more, and can be set according to actual needs.

[0053] In this embodiment, the cross-sectional width of the area of ​​the air avoidance groove 52 close to the main body 31 is smaller than the cross-sectional width of the area of ​​the air avoidance groove 52 close to the center of the central magnetic structure 5, and the bending section 321 of the lead 32 is located in the area with a larger cross-sectional width of the air avoidance groove 52. This can effectively reduce the influence of the setting of the air avoidance groove 52 on the magnetic field strength of the micro speaker.

[0054] In a specific product, the lead wire 32 of the voice coil 3 may be located outside the body 31. In this case, the hollow area of ​​the voice coil 3 is only provided with the auxiliary membrane 7, and the lead wire 32 is not visible. Figure 4 shown.

[0055] In order to prevent the lead wire 32 from interfering with the auxiliary membrane 7 when the micro speaker is working, preferably, when the micro speaker is viewed from a top perspective, there is no overlapping area between the lead wire 32 and the auxiliary membrane 7.

[0056] For ease of assembly, the fixing platform 41 and the yoke 4 are integrally formed into an integrated structure, and the specific methods of integral forming include but are not limited to insert injection molding, cutting and stamping molding, etc. Of course, in other embodiments, it is also acceptable that the fixing platform 41 and the yoke 4 are split structures. In this case, the fixing platform 41 and the yoke 4 are connected by adhesive, snap connection, welding or fasteners, and the fasteners are not limited to screws. In this embodiment, the fixing platform 41 is a hollow convex hull formed by stamping a part of the yoke 4.

[0057] Embodiment 2

[0058] Please refer to Figure 5 The second embodiment of the present invention is a parallel technical solution of the first embodiment, and is different from the first embodiment in that the outer mounting portion 73 of the auxiliary membrane 7 is connected to the inner wall surface of the voice coil 3 .

[0059] Embodiment 3

[0060] Please refer to Figure 6 The third embodiment of the present invention is a parallel technical solution of the first embodiment, and is different from the first embodiment in that the outer mounting portion 73 of the auxiliary membrane 7 is connected to the outer wall surface and the bottom surface of the voice coil 3 at the same time.

[0061] Embodiment 4

[0062] Please refer to Figure 7, Embodiment 4 of the present utility model is a parallel technical solution of Embodiment 1, and is different from Embodiment 1 in that: in this embodiment, the number of the auxiliary membrane 7 is one, and the auxiliary membrane 7 includes a middle mounting portion 74, a folding ring structure 75, and a side mounting portion 76, wherein the middle mounting portion 74 is fixed on the fixing platform 41, including but not limited to adhesive connection, and the two ends of the middle mounting portion 74 are respectively connected to the folding ring structure 75, and the end of the folding ring structure 75 away from the middle mounting portion 74 is connected to the side mounting portion 76, and the side mounting portion 76 is connected to the voice coil 3. Such a setting can reduce the parts of the micro speaker, simplify the assembly process of the micro speaker, and thus reduce the manufacturing cost of the micro speaker.

[0063] Embodiment 5

[0064] Embodiment 5 of the present utility model is a parallel technical solution of embodiment 1, and is different from embodiment 1 in that: the voice coil does not need to be provided with a long lead wire, and also does not need to be provided with an air avoidance groove. Specifically, a conductive circuit electrically connected to the voice coil is provided on the secondary membrane, and a power connection structure is provided on the fixing platform. The power connection structure is used for electrically conducting with an external power supply, and the power connection structure includes but is not limited to cables, etc.

[0065] The above are only optional embodiments of the present invention, and do not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the utility model concept, or directly / indirectly used in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A micro speaker, characterized in that: include A magnetic circuit assembly, the magnetic circuit assembly comprising a yoke and a central magnetic structure arranged on the yoke, the central magnetic structure being provided with an avoidance groove, the two ends of the avoidance groove being respectively connected to the outer wall surface of the central magnetic structure, the yoke being provided with a fixing platform, and the fixing platform being located in the avoidance groove; a voice coil, the voice coil being arranged corresponding to the central magnetic structure; A secondary membrane, wherein the secondary membrane is arranged corresponding to the avoidance groove, and the secondary membrane connects the voice coil and the fixing platform.

2. The micro-speaker according to claim 1, characterized in that: The number of the auxiliary membranes is multiple, and the multiple auxiliary membranes are divided into a plurality of groups with two as one group, and the two auxiliary membranes in the same group are centrally symmetrical.

3. The micro-speaker according to claim 1, characterized in that: The connection point between the auxiliary membrane and the voice coil is located at the long axis side, short axis side or corner of the voice coil.

4. The micro-speaker according to claim 1, characterized in that: The auxiliary membrane includes an inner mounting portion, a folding ring portion and an outer mounting portion which are sequentially connected from the inside to the outside, the inner mounting portion is connected to the fixing platform, and at least one of the inner wall surface, the bottom surface and the outer wall surface of the voice coil is connected to the outer mounting portion.

5. The micro-speaker according to claim 4, characterized in that: The avoidance groove is connected to the top surface and the bottom surface of the central magnetic structure, and the yoke is provided with an avoidance hole for avoiding the auxiliary film.

6. The micro-speaker according to claim 1, characterized in that: A conductive circuit is provided on the secondary membrane, and the conductive circuit is electrically connected to the voice coil.

7. The micro-speaker according to claim 1, characterized in that: The voice coil includes a connected body and a lead, the lead is arranged corresponding to the hollow area of ​​the body, the central magnetic structure is provided with a clearance groove for avoiding the lead, a partial area of ​​the lead is fixed on the fixing platform, and also includes a through hole, and an end of the lead away from the body passes through the bottom of the yoke through the through hole.

8. The micro-speaker according to claim 7, characterized in that: When the micro speaker is viewed from a top-down perspective, the lead wire has no overlapping area with the auxiliary membrane.

9. The micro-speaker according to claim 1, characterized in that: The fixing platform is a hollow convex hull formed by stamping a partial area of ​​the yoke.

10. The micro-speaker according to claim 1, characterized in that: The secondary membrane includes a middle mounting part, a folded ring structure and a side mounting part. The middle mounting part is fixed on the fixed platform, the two ends of the middle mounting part are respectively connected to the folded ring structure, the end of the folded ring structure away from the middle mounting part is connected to the side mounting part, and the side mounting part is connected to the voice coil.

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