Miniature loudspeaker

Abstract

The utility model discloses a miniature loudspeaker, which comprises a frame, a magnetic circuit assembly, a diaphragm assembly and a waterproof breathable film, the magnetic circuit assembly is connected with the frame and comprises a yoke and a central magnetic structure arranged on the yoke, and the top surface of the central magnetic structure is provided with an avoidance hole; the vibrating diaphragm assembly is connected with the basin frame, the middle area of the vibrating diaphragm assembly is provided with a protruding column protruding towards the direction close to the yoke, the protruding column is arranged corresponding to the avoiding hole, the protruding column is internally provided with an air hole, and the air hole is communicated with the outside and the internal space of the miniature loudspeaker; the waterproof breathable film wraps the end, close to the yoke, of the protruding column so as to seal the breathable hole, and the waterproof breathable film is fixedly connected with the protruding column. According to the miniature loudspeaker, the diaphragm assembly can vibrate in a larger amplitude, and the acoustic performance is good; the avoiding hole in the central magnetic steel not only has the effect of avoiding the convex column and the waterproof breathable film, but also has the effect of accelerating heat dissipation of the magnetic circuit assembly, and is beneficial to long-time stable work of the miniature loudspeaker.

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 for a micro speaker to achieve superior high-frequency acoustic properties, the diaphragm assembly must have sufficient rigidity and toughness to withstand violent reciprocating motion.

[0003] In order to balance the air pressure difference between the inside and outside of the micro-speaker during operation, it is often necessary to provide a leakage hole on the micro-speaker to connect the internal space of the micro-speaker with the outside, and to provide a waterproof breathable membrane to cover the leakage hole to achieve the purpose of waterproofing. The waterproof breathable membrane is usually fixed to the diaphragm assembly by glue, which will undoubtedly lead to an increase in the thickness of the diaphragm assembly, so that the amplitude of the diaphragm assembly is reduced. Utility Model Content

[0004] The technical problem solved by the utility model is to provide a miniature loudspeaker with a larger amplitude.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is: a micro speaker, comprising:

[0006] basin stand;

[0007] A magnetic circuit assembly, the magnetic circuit assembly is connected to the basin frame, the magnetic circuit assembly comprises a yoke and a central magnetic structure arranged on the yoke, and a top surface of the central magnetic structure is provided with an avoidance hole;

[0008] A diaphragm assembly, wherein the diaphragm assembly is connected to the basin frame, wherein a central region of the diaphragm assembly has a convex column protruding toward the yoke, wherein the convex column is arranged corresponding to the avoidance hole, wherein an air hole is arranged in the convex column, wherein the air hole connects the outside with the internal space of the micro speaker;

[0009] A waterproof and breathable membrane covers an end of the convex column close to the yoke to close the air hole, and the waterproof and breathable membrane is fixedly connected to the convex column.

[0010] In one embodiment, the outer wall surface of the protruding column is adhesively connected to the waterproof breathable membrane.

[0011] In one embodiment, the number of the protruding column is one, and the avoidance hole is located at the center of the central magnetic structure.

[0012] In one embodiment, the number of the bosses is multiple, and the number of the avoidance holes is one or more. When the number of the avoidance holes is less than the number of the bosses, at least two of the bosses correspond to the same avoidance hole.

[0013] In one embodiment, the avoidance hole is a blind hole or a through hole.

[0014] In one embodiment, the avoidance hole is a through hole, the yoke has a hole groove arranged corresponding to the avoidance hole, the hole groove is connected to the avoidance hole, and the hole groove is connected to or not connected to the bottom surface of the yoke.

[0015] In one embodiment, the diaphragm assembly includes a spherical top, and the convex column is arranged on the spherical top.

[0016] In one embodiment, the diaphragm assembly also includes a sound membrane, and the sound membrane includes an inner fixed part, a folded ring part and an outer fixed part which are connected in sequence from the inside to the outside, the outer fixed part is connected to the basin frame, the ball top is installed on the top surface of the inner fixed part, and the inner fixed part has a first through hole for the boss to pass through; or, the ball top is installed on the bottom surface of the inner fixed part, and the inner fixed part has a first air hole connected to the air hole.

[0017] In one embodiment, the diaphragm assembly includes a sound membrane, and the sound membrane includes an inner fixing portion, a folding ring portion and an outer fixing portion which are sequentially connected from the inside to the outside, the outer fixing portion is connected to the basin frame, and the protruding column is arranged on the inner fixing portion.

[0018] In one embodiment, the diaphragm assembly further includes a spherical top, which is mounted on the top surface of the inner fixed portion, and has a second air vent connected to the air hole; or, the spherical top is mounted on the bottom surface of the inner fixed portion, and has a second through hole for the boss to pass through.

[0019] The beneficial effect of the utility model is that the diaphragm assembly has a hollow convex column for ventilation, and the waterproof breathable film is used to cover the end of the convex column, so that the provision of the waterproof breathable film does not increase the thickness of the diaphragm assembly, thereby ensuring that the amplitude design of the diaphragm assembly does not need to be reduced, and the diaphragm assembly can vibrate with a larger amplitude, thereby achieving the effect of improving the acoustic performance of the micro-speaker. In addition, the avoidance hole on the central magnetic steel not only plays the role of avoiding the convex column and the waterproof breathable film, but also plays the effect of accelerating the heat dissipation of the magnetic circuit assembly, which is conducive to the long-term stable operation of the micro-speaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] 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.

[0021] Figure 1An exploded view of a micro-speaker of the first structure of the first embodiment of the utility model;

[0022] Figure 2 A cross-sectional view of a micro-speaker of a first structure of Embodiment 1 of the present utility model;

[0023] Figure 3 This is a schematic structural diagram of a dome and a waterproof breathable membrane in a micro-speaker of a first structure according to the first embodiment of the present utility model;

[0024] Figure 4 A cross-sectional view of a micro-speaker of the second structure of the first embodiment of the utility model;

[0025] Figure 5 A cross-sectional view of a micro-speaker of the third structure of the first embodiment of the utility model;

[0026] Figure 6 It is a schematic structural diagram of the dome and the waterproof breathable membrane in the micro speaker of the second embodiment of the utility model;

[0027] Figure 7 It is a cross-sectional view of the micro-speaker according to the second embodiment of the present invention.

[0028] Description of Figure Numbers:

[0029] 1. Basin stand;

[0030] 2. Magnetic circuit assembly; 21. Yoke iron; 211. Hole slot; 22. Center magnetic structure; 221. Avoidance hole; 222. Center magnetic steel; 223. Center washer; 23. Side magnetic structure;

[0031] 3. Diaphragm assembly; 31. convex column; 311. air vent; 32. sound membrane; 33. dome;

[0032] 4. Voice coil;

[0033] 5. Waterproof and breathable membrane;

[0034] 6. Support components. 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 5 , Embodiment 1 of the present utility model is: a micro speaker, which can be applied to electronic products such as mobile phones, tablet computers, smart watches, game controllers, walkie-talkies, headphones, etc.

[0043] The micro speaker includes a basin frame 1, a magnetic circuit component 2, a diaphragm component 3, a voice coil 4 and a waterproof breathable membrane 5, wherein the magnetic circuit component 2 and the diaphragm component 3 are respectively connected to the basin frame 1, and the voice coil 4 is located on the inner side of the basin frame 1 and is fixedly connected to the diaphragm component 3; the magnetic circuit component 2 includes a yoke 21, a central magnetic structure 22 arranged on the yoke 21, and a side magnetic structure 23 arranged on the yoke 21, wherein the central magnetic structure 22 is arranged corresponding to the hollow area of ​​the voice coil 4, and a magnetic gap is formed between the central magnetic structure 22 and the side magnetic structure 23 for the movement of the voice coil 4. An avoidance hole 221 is provided on the top surface of the central magnetic structure 22; the middle area of ​​the diaphragm assembly 3 has a boss 31 protruding toward the yoke 21, and the boss 31 is arranged corresponding to the avoidance hole 221. The avoidance hole 221 plays an effect of avoiding the boss 31, and an air hole 311 is provided in the boss 31. The air hole 311 connects the outside with the internal space of the micro speaker; the waterproof and breathable membrane 5 covers one end of the boss 31 close to the yoke 21 to close the air hole 311, and the waterproof and breathable membrane 5 is fixedly connected to the boss 31.

[0044] The protrusion 31 can be configured as required, for example, it can be cylindrical, prism-shaped, etc.; the cross-sectional shape of the air vent 311 can be circular, elliptical, polygonal or other special shapes.

[0045] In order to ensure the stability of the connection between the waterproof breathable membrane 5 and the protrusion 31, preferably, the outer wall surface of the protrusion 31 is adhesively connected to the waterproof breathable membrane 5. It is easy to understand that the adhesive bonding area between the waterproof breathable membrane 5 and the protrusion 31 can be set according to actual needs. The larger the adhesive bonding area between the two, the more firmly the waterproof breathable membrane 5 and the protrusion 31 are bonded.

[0046] In this embodiment, the number of the convex column 31 is one, and preferably, the avoidance hole 221 is located in the center of the central magnetic structure 22. In the micro-speaker, the utilization rate of the magnetic flux lines in the central area of ​​the central magnetic structure 22 is lower than that of the magnetic flux lines in the peripheral area of ​​the central magnetic structure 22. At the same time, in the magnetic circuit component 2, the heat dissipation rate of the central area of ​​the central magnetic structure 22 is also relatively low. Therefore, setting the avoidance hole 221 in the center of the central magnetic structure 22 can not only reduce the influence of the setting of the avoidance hole 221 on the magnetic field strength of the magnetic circuit component 2, but also better improve the heat dissipation performance of the micro-speaker. It should be noted that in other embodiments, the number of the convex column 31 can also be multiple.

[0047] The diaphragm assembly 3 includes a sound film 32 and a dome 33. The sound film 32 includes an inner fixing portion, a folding ring portion and an outer fixing portion which are sequentially connected from the inside to the outside. The outer fixing portion is connected to the basin frame 1. In this embodiment, a window is provided on the inner fixing portion, the dome 33 is provided in the window, and the convex column 31 is provided on the dome 33. In other embodiments, when the window is not provided on the inner fixing portion, the dome 33 is installed on the top surface of the inner fixing portion, and the inner fixing portion has a first through hole for the convex column 31 to pass through; or, the dome 33 is installed on the bottom surface of the inner fixing portion, and the inner fixing portion has a first vent hole connected to the vent hole 311. At this time, the vent hole 311 is connected to the outside through the first vent hole.

[0048] For ease of processing, the ball top 33 and the boss 31 are preferably an integrated structure formed by integral processing.

[0049] like Figure 1 and Figure 2 As shown, optionally, in order to improve the polarization and rolling phenomena of the voice coil 4, the micro speaker further includes a supporting component 6, wherein the supporting component 6 connects the basin frame 1 and the voice coil 4, and the supporting component 6 includes a centering support plate and / or an auxiliary membrane.

[0050] The avoidance hole 221 is a blind hole or a through hole. Specifically, the central magnetic structure 22 includes a central magnetic steel 222 and a central washer 223. The bottom surface of the central magnetic steel 222 is connected to the yoke 21, and the top surface of the central magnetic steel 222 is connected to the central washer 223. The avoidance hole 221 is provided on the top surface of the central washer 223. When the avoidance hole 221 is connected to the bottom surface of the central magnetic steel 222, the avoidance hole 221 is a through hole (such as Figure 2 As shown), when the avoidance hole 221 is not connected to the bottom surface of the central magnetic steel 222, the avoidance hole 221 is a blind hole (as shown in FIG. Figure 4 shown).

[0051] Further, when the avoidance hole 221 is a through hole, optionally, the yoke 21 has a hole groove 211 arranged corresponding to the avoidance hole 221, the hole groove 211 is connected to the avoidance hole 221, and the hole groove 211 is connected to the bottom surface of the yoke 21 (such as Figure 5 As shown), or, the hole groove 211 is not connected to the bottom surface of the yoke 21.

[0052] The edge magnetic structure 23 includes edge magnetic steel and edge washers, the edge magnetic steel connects the edge washers and the yoke 21, and the edge washers connect the basin frame 1. As an alternative, in a specific product, a part of the yoke 21 may be bent to form a flange to replace the edge magnetic structure 23.

[0053] Embodiment 2

[0054] Please refer to Figure 6 Embodiment 2 of the present invention is a parallel technical solution of embodiment 1, and is different from embodiment 1 in that: the number of bosses 31 is multiple, and the number of avoidance holes 221 is one or more. When the number of avoidance holes 221 is less than the number of bosses 31, at least two bosses 31 correspond to the same avoidance hole 221.

[0055] Preferably, the number of the avoidance holes 221 is the same as the number of the convex pillars 31 , and the avoidance holes 221 and the convex pillars 31 are arranged in a one-to-one correspondence.

[0056] In this embodiment, the number of the convex pillars 31 is three, and each of the convex pillars 31 is covered with a waterproof breathable membrane 5 .

[0057] Embodiment 3

[0058] Please refer to Figure 7 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 protruding column 31 is arranged on the sound membrane 32, specifically, on the inner fixing portion of the sound membrane 32.

[0059] For ease of processing, the sound membrane 32 and the protruding column 31 are preferably an integral structure formed by integral processing, such as injection molding.

[0060] In a specific product, the diaphragm assembly 3 includes the sound membrane 32 and further includes a dome 33 , or it may not include the dome 33 as in the present embodiment.

[0061] When the diaphragm assembly 3 also includes a spherical top 33, the spherical top 33 is installed on the top surface of the inner fixing part, and the spherical top 33 has a second ventilation hole connected to the ventilation hole 311; or, the spherical top 33 is installed on the bottom surface of the inner fixing part, and the spherical top 33 has a second through hole for the boss 31 to pass through.

[0062] 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 basin stand; A magnetic circuit assembly, the magnetic circuit assembly is connected to the basin frame, the magnetic circuit assembly comprises a yoke and a central magnetic structure arranged on the yoke, and a top surface of the central magnetic structure is provided with an avoidance hole; A diaphragm assembly, wherein the diaphragm assembly is connected to the basin frame, wherein a central region of the diaphragm assembly has a convex column protruding toward the yoke, wherein the convex column is arranged corresponding to the avoidance hole, wherein an air hole is arranged in the convex column, wherein the air hole connects the outside with the internal space of the micro speaker; A waterproof and breathable membrane covers an end of the convex column close to the yoke to close the air hole, and the waterproof and breathable membrane is fixedly connected to the convex column.

2. The micro-speaker according to claim 1, characterized in that: The outer wall surface of the convex column is adhesively connected to the waterproof breathable membrane.

3. The micro-speaker according to claim 1, characterized in that: The number of the protruding column is one, and the avoidance hole is located at the center of the central magnetic structure.

4. The micro-speaker according to claim 1, characterized in that: The number of the bosses is multiple, and the number of the avoidance holes is one or more. When the number of the avoidance holes is less than the number of the bosses, at least two of the bosses correspond to the same avoidance hole.

5. The micro-speaker according to claim 1, characterized in that: The avoidance hole is a blind hole or a through hole.

6. The micro-speaker according to claim 5, characterized in that: The avoidance hole is a through hole, and the yoke is provided with a hole groove arranged corresponding to the avoidance hole, the hole groove is connected with the avoidance hole, and the hole groove is connected with or not connected with the bottom surface of the yoke.

7. The micro-speaker according to claim 1, characterized in that: The diaphragm assembly comprises a spherical top, and the convex column is arranged on the spherical top.

8. The micro-speaker according to claim 7, characterized in that: The diaphragm assembly also includes a sound membrane, which includes an inner fixed part, a folded ring part and an outer fixed part connected in sequence from the inside to the outside, the outer fixed part is connected to the basin frame, the ball top is installed on the top surface of the inner fixed part, and the inner fixed part has a first through hole for the boss to pass through; or, the ball top is installed on the bottom surface of the inner fixed part, and the inner fixed part has a first ventilation hole connected to the ventilation hole.

9. The micro-speaker according to claim 1, characterized in that: The diaphragm assembly includes a sound diaphragm, and the sound diaphragm includes an inner fixing part, a folding ring part and an outer fixing part which are connected in sequence from the inside to the outside. The outer fixing part is connected to the basin frame, and the convex column is arranged on the inner fixing part.

10. The micro-speaker according to claim 9, characterized in that: The diaphragm assembly also includes a spherical top, which is mounted on the top surface of the inner fixing portion and has a second air vent connected to the air hole; or, the spherical top is mounted on the bottom surface of the inner fixing portion and has a second through hole for the boss to pass through.

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