Sound production unit

Abstract

The utility model discloses a sounding unit, which comprises a basin stand, a magnetic circuit assembly, a vibrating diaphragm and a waterproof breathable film, the magnetic circuit assembly is fixedly connected with the basin stand, the magnetic circuit assembly comprises a yoke and a central magnetic structure arranged on the yoke, and the central magnetic structure comprises a lower central magnetic steel, a central washer and an upper central magnetic steel which are sequentially stacked and connected from bottom to top. The lower central magnetic steel is connected with the yoke; the vibrating diaphragm comprises an inner fixing part, a folding ring part and an outer fixing part which are sequentially connected from inside to outside, the outer fixing part is fixedly connected with the basin stand, the bottom surface of the inner fixing part is fixedly connected with the top surface of the upper central magnetic steel, and the inner fixing part is integrally in a ring frame shape; the magnetic circuit assembly is provided with an airflow channel communicating the top surface of the upper center magnetic steel and the lower space of the vibrating diaphragm, and the communicating position of the airflow channel and the top surface of the upper center magnetic steel is located in the hollow area of the inner fixing part. The waterproof breathable film is connected with the upper center magnetic steel and covers the airflow channel. The sound production unit has the functions of ventilation and pressure relief, so that the whole machine is not provided with a rear shell small hole and cannot be blocked by external dirt.

Description

Technical Field

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

[0002] At present, the dynamic sound unit drives the coil through electromagnetic force. The coil drives the diaphragm bonded to it to do reciprocating motion and radiate sound waves outward. The coil in the sound unit itself generates a lot of heat when working. When the sound unit continues to work, the heat generated by it will heat and expand the internal air, making the internal air pressure greater than the external air pressure. If the internal pressure cannot be released, the diaphragm will bulge outward and be unable to vibrate and make sound. The folding ring part of the diaphragm is made of flexible material and is a non-rigid body. Therefore, if an air pressure difference is formed inside and outside the diaphragm, it will affect the shape of the folding ring part and make it difficult for the diaphragm to move to the side with higher air pressure, resulting in failure of its normal sound function.

[0003] At present, the existing technology is to open a small hole on the back shell of a mobile phone, tablet, watch or other device, and stick a breathable film on the small hole. The small hole connects to the internal space of the sound unit to balance the air pressure difference inside and outside the diaphragm. However, the small hole on the back shell and the breathable film are in contact with the external environment. As the use time increases, they are easily blocked by foreign matter and dirt in the external environment, resulting in failure, causing abnormal function of the pronunciation unit and affecting customer use. Utility Model Content

[0004] The technical problem solved by the utility model is to provide a sound-generating unit capable of balancing the air pressure inside and outside the diaphragm.

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

[0006] basin stand;

[0007] A magnetic circuit assembly, the magnetic circuit assembly is fixedly connected to the basin frame, the magnetic circuit assembly includes a yoke and a central magnetic structure arranged on the yoke, the central magnetic structure includes a lower central magnetic steel, a central washer and an upper central magnetic steel stacked and connected in sequence from bottom to top, and the lower central magnetic steel is connected to the yoke;

[0008] A diaphragm, the diaphragm comprising 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 fixedly connected to the basin frame, the bottom surface of the inner fixing portion is fixedly connected to the top surface of the upper center magnetic steel, and the inner fixing portion is in a ring frame shape as a whole;

[0009] The magnetic circuit assembly is provided with an air flow channel connecting the top surface of the upper center magnetic steel and the space under the diaphragm, and the connection point between the air flow channel and the top surface of the upper center magnetic steel is located in the hollow area of ​​the inner fixing part;

[0010] A waterproof and breathable membrane is connected to the upper center magnetic steel and covers the air flow channel.

[0011] In one embodiment, the air flow channel includes a vertical channel and a transverse channel that are connected, the top end of the vertical channel is connected to the top surface of the upper center magnetic steel, and the transverse channel is connected to the outer wall surface of the center magnetic structure.

[0012] In one embodiment, the transverse channel is located at the joint surface between the center washer and the upper center magnetic steel.

[0013] In one embodiment, the transverse channel is located at the joint surface between the center washer and the lower center magnetic steel.

[0014] In one embodiment, the transverse channel is located at the joint surface between the yoke and the lower center magnetic steel.

[0015] In one embodiment, the waterproof and breathable membrane is provided on the top of the upper center magnetic steel.

[0016] In one embodiment, the waterproof and breathable membrane is provided at the bottom of the upper center magnetic steel.

[0017] In one embodiment, the waterproof and breathable membranes are respectively provided on the top and bottom of the upper center magnetic steel.

[0018] In one embodiment, the air flow channel is connected to the bottom surface of the yoke.

[0019] The beneficial effects of the utility model are:

[0020] An air flow channel is arranged on the magnetic circuit assembly of the sound unit, and a waterproof breathable membrane is arranged on the upper center magnet, so that the function of balancing the air pressure by opening a small hole on the back shell of the whole machine is integrated into the sound unit body, so that the sound unit has its own ventilation and pressure relief function, and the whole machine has no small hole on the back shell, which will not be blocked by external dirt, which is conducive to ensuring that the sound unit can work stably for a long time.

[0021] The inner fixed part of the diaphragm is fixedly connected to the central magnetic structure, which not only improves the structural stability of the sound unit, but also allows the overall volume of the central magnetic structure in the sound unit to be set larger, thereby improving the acoustic performance of the sound unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] 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.

[0023] Figure 1 This is an exploded view of the sound unit of the first embodiment of the utility model;

[0024] Figure 2 It is a cross-sectional view of the sound unit of the first embodiment of the utility model;

[0025] Figure 3 A cross-sectional view of a sound-emitting unit of another structure according to the first embodiment of the present utility model;

[0026] Figure 4 It is a cross-sectional view of the sound unit of the second embodiment of the present utility model;

[0027] Figure 5 A cross-sectional view of a sound-emitting unit of another structure according to the second embodiment of the present utility model;

[0028] Figure 6 It is a cross-sectional view of the sound unit of the third embodiment of the present utility model;

[0029] Figure 7 A cross-sectional view of a sound-emitting unit of another structure according to Embodiment 3 of the present utility model;

[0030] Figure 8 It is a cross-sectional view of the sound-emitting unit of the fourth embodiment of the utility model;

[0031] Fig. 9 It is a cross-sectional view of the sound-emitting unit of the fifth embodiment of the present utility model;

[0032] Fig.10 This is a cross-sectional view of the sound-emitting unit of the sixth embodiment of the present invention.

[0033] Description of Figure Numbers:

[0034] 1. Basin stand;

[0035] 2. Magnetic circuit assembly; 21. Yoke iron; 22. Center magnetic structure; 221. Lower center magnetic steel; 222. Center washer; 223. Upper center magnetic steel; 23. Side magnetic structure; 231. Side magnetic steel; 232. Side washer; 24. Magnetic gap; 25. Air flow channel; 251. Vertical channel; 252. Horizontal channel;

[0036] 3. diaphragm; 31. inner fixing portion; 32. folding ring portion; 321. inner folding ring; 322. transition portion; 323. outer folding ring; 33. outer fixing portion;

[0037] 4. Voice coil;

[0038] 5. Waterproof and breathable membrane;

[0039] 6. Skeleton;

[0040] 7. Support components. DETAILED DESCRIPTION

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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 and 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 the present utility model.

[0046] 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.

[0047] Embodiment 1

[0048] Please refer to Figures 1 to 3 , Embodiment 1 of the present utility model is: a sound unit, including a basin frame 1, a magnetic circuit component 2, a diaphragm 3, a voice coil 4 and a waterproof breathable membrane 5, the magnetic circuit component 2 is fixedly connected to the basin frame 1, the magnetic circuit component 2 includes a yoke 21 and a central magnetic structure 22 and a side magnetic structure 23 respectively arranged on the yoke 21, the central magnetic structure 22 is located between at least one group of two side magnetic structures 23 arranged oppositely, a magnetic gap 24 is formed between the central magnetic structure 22 and the side magnetic structure 23, the voice coil 4 is connected to the diaphragm 3 and is arranged corresponding to the magnetic gap 24, the diaphragm 3 includes an inner fixed part 31, a folding ring part 32 and an outer fixed part 33 connected in sequence from the inside to the outside, the outer fixed part 33 is fixedly connected to the basin frame 1, and the bottom surface of the inner fixed part 31 is fixedly connected to the top surface of the central magnetic structure 22.

[0049] The central magnetic structure 22 includes a lower central magnetic steel 221, a central washer 222 and an upper central magnetic steel 223 which are stacked and connected in sequence from bottom to top. The bottom surface of the lower central magnetic steel 221 is connected to the yoke 21, and the bottom surface of the inner fixed part 31 is fixedly connected to the top surface of the upper central magnetic steel 223. The inner fixed part 31 is in the shape of a ring frame as a whole. The magnetic circuit assembly 2 is provided with an air flow channel 25 connecting the top surface of the upper central magnetic steel 223 and the lower space of the diaphragm 3. The connection point between the air flow channel 25 and the top surface of the upper central magnetic steel 223 is located in the hollow area of ​​the inner fixed part 31. The waterproof and breathable membrane 5 is connected to the upper central magnetic steel 223 and covers the air flow channel 25. The waterproof and breathable membrane 5 can prevent water in the front cavity of the diaphragm 3 from flowing to the rear cavity, thereby achieving a waterproof effect for the entire machine. It should be noted that the lower space of the diaphragm 3 refers to the space on the side of the diaphragm 3 close to the yoke 21 , which can be not only the magnetic gap 24 but also a combined space formed by the space on the side of the yoke 21 away from the diaphragm 3 and the magnetic gap 24 .

[0050] The edge magnetic structure 23 is connected to the basin frame 1. Specifically, the edge magnetic structure 23 includes an edge magnetic steel 231 and a edge washer 232. The edge magnetic steel 231 is respectively connected to the edge washer 232, the yoke 21 and the basin frame 1. In other embodiments, the edge magnetic structure 23 is a flange formed by bending a partial area of ​​the yoke 21, which is also acceptable.

[0051] Optionally, the sound-emitting unit further includes a skeleton 6 , and the voice coil 4 is indirectly connected to the diaphragm 3 via the skeleton 6 .

[0052] In this embodiment, the folding ring portion 32 includes an inner folding ring 321, a transition portion 322 and an outer folding ring 323 which are connected in sequence from the inside to the outside, the inner folding ring 321 is connected to the inner fixed portion 31, the outer folding ring 323 is connected to the outer fixed portion 33, and the skeleton 6 is connected to the transition portion 322. In this embodiment, the skeleton 6 and the diaphragm 3 are an integrated structure formed by insert injection molding.

[0053] In order to improve the rolling vibration phenomenon of the voice coil 4, optionally, the sound unit further includes a support assembly 7, the support assembly 7 connects the basin frame 1 and the voice coil 4, and the support assembly 7 includes a centering support plate and / or an auxiliary membrane.

[0054] In this embodiment, the waterproof breathable membrane 5 is provided on the top of the upper center magnetic steel 223. In other embodiments, the waterproof breathable membrane 5 may also be connected to the bottom of the upper center magnetic steel 223, specifically located in the air flow channel 25; of course, it is also possible to provide the waterproof breathable membrane 5 on the top and bottom of the upper center magnetic steel 223, respectively, so that the waterproof performance of the sound unit can be improved to a greater extent.

[0055] In this embodiment, the air flow channel 25 includes a vertical channel 251 and a transverse channel 252 that are connected. The top of the vertical channel 251 is connected to the top surface of the upper center magnetic steel 223, and the transverse channel 252 is connected to the outer wall surface of the central magnetic structure 22. Specifically, the transverse channel 252 is located at the joint surface of the central washer 222 and the upper center magnetic steel 223. At this time, there are three ways to set the transverse channel 252:

[0056] 1. The entire area of ​​the transverse channel 252 is located on the upper center magnetic steel 223, and the bottom surface of the transverse channel 252 is connected to the bottom surface of the upper center magnetic steel 223 (such as Figure 2 shown);

[0057] Second, the entire area of ​​the transverse channel 252 is located on the central washer 222, and the top surface of the transverse channel 252 is connected to the top surface of the central washer 222 (such as Figure 3 shown);

[0058] 3. A portion of the transverse channel 252 is located at the bottom of the upper center magnetic steel 223 , and another portion of the transverse channel 252 is located at the top of the center washer 222 .

[0059] Embodiment 2

[0060] Please refer to Figure 4 and Figure 5 The second embodiment of the present invention is a parallel technical solution of the first embodiment, and the difference from the first embodiment is that the setting position of the transverse channel 252 is different.

[0061] In this embodiment, the transverse channel 252 is located at the joint surface of the central washer 222 and the lower central magnetic steel 221. At this time, there are three ways to set the transverse channel 252:

[0062] 1. The entire area of ​​the transverse channel 252 is located on the center washer 222, and the bottom surface of the transverse channel 252 is connected to the bottom surface of the center washer 222 (such as Figure 4 shown);

[0063] Second, the entire area of ​​the transverse channel 252 is located on the lower center magnetic steel 221, and the top surface of the transverse channel 252 is connected to the top surface of the lower center magnetic steel 221 (such as Figure 5 shown);

[0064] 3. A portion of the transverse channel 252 is located at the bottom of the center washer 222 , and another portion of the transverse channel 252 is located at the top of the lower center magnetic steel 221 .

[0065] Embodiment 3

[0066] Please refer to Figure 6 and Figure 7 The third embodiment of the present invention is a parallel technical solution of the first embodiment, and the difference from the first embodiment is that the setting position of the transverse channel 252 is different.

[0067] In this embodiment, the transverse channel 252 is located at the joint surface of the yoke 21 and the lower center magnetic steel 221. At this time, there are three ways to set the transverse channel 252:

[0068] 1. The entire area of ​​the transverse channel 252 is located on the lower center magnetic steel 221, and the bottom surface of the transverse channel 252 is connected to the bottom surface of the lower center magnetic steel 221 (such as Figure 6 shown);

[0069] Second, the entire area of ​​the transverse channel 252 is located on the yoke 21, and the top surface of the transverse channel 252 is connected to the top surface of the yoke 21 (such as Figure 7 shown);

[0070] 3. A portion of the transverse channel 252 is located at the bottom of the lower center magnetic steel 221 , and another portion of the transverse channel 252 is located at the top of the yoke 21 .

[0071] When part or all of the transverse channel 252 is located on the yoke 21 , a groove structure may be provided on the yoke 21 to serve as part or all of the transverse channel 252 .

[0072] Embodiment 4

[0073] Please refer to Figure 8 The fourth embodiment of the present utility model is a parallel technical solution of the first embodiment, and is different from the first embodiment in that the structure of the air flow channel 25 is different.

[0074] In this embodiment, the air flow channel 25 does not have a transverse channel 252 , and the air flow channel 25 is directly connected to the bottom surface of the yoke 21 .

[0075] Embodiment 5

[0076] Please refer to Fig. 9 The fifth embodiment of the present utility model is a parallel technical solution of the fourth embodiment, and is different from the fourth embodiment in that the waterproof breathable membrane 5 is arranged in a different position.

[0077] In this embodiment, the waterproof breathable membrane 5 is located in the air flow channel 25 and is disposed at the bottom of the upper center magnetic steel 223 .

[0078] Embodiment 6

[0079] Please refer to Fig.10 Embodiment 6 of the present invention is a further improvement made on the basis of Embodiment 5, and is different from Embodiment 5 in that: a waterproof and breathable membrane 5 is respectively provided at the top and bottom of the upper center magnetic steel 223, wherein the waterproof and breathable membrane 5 located at the top of the upper center magnetic steel 223 is connected to the top surface of the upper center magnetic steel 223, and the waterproof and breathable membrane 5 connected to the bottom of the upper center magnetic steel 223 is located in the air flow channel 25.

[0080] 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 sound unit, characterized in that: include basin stand; A magnetic circuit assembly, the magnetic circuit assembly is fixedly connected to the basin frame, the magnetic circuit assembly includes a yoke and a central magnetic structure arranged on the yoke, the central magnetic structure includes a lower central magnetic steel, a central washer and an upper central magnetic steel stacked and connected in sequence from bottom to top, and the lower central magnetic steel is connected to the yoke; A diaphragm, the diaphragm comprising 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 fixedly connected to the basin frame, the bottom surface of the inner fixing portion is fixedly connected to the top surface of the upper center magnetic steel, and the inner fixing portion is in a ring frame shape as a whole; The magnetic circuit assembly is provided with an air flow channel connecting the top surface of the upper center magnetic steel and the space under the diaphragm, and the connection point between the air flow channel and the top surface of the upper center magnetic steel is located in the hollow area of ​​the inner fixing part; A waterproof and breathable membrane is connected to the upper center magnetic steel and covers the air flow channel.

2. The sound generating unit according to claim 1, characterized in that: The airflow channel includes a vertical channel and a transverse channel that are connected. The top of the vertical channel is connected to the top surface of the upper center magnetic steel, and the transverse channel is connected to the outer wall surface of the center magnetic structure.

3. The sound unit according to claim 2, characterized in that: The transverse channel is located at the joint surface between the center washer and the upper center magnetic steel.

4. The sound generating unit according to claim 2, characterized in that: The transverse channel is located at the joint surface between the center washer and the lower center magnetic steel.

5. The sound generating unit according to claim 2, characterized in that: The transverse channel is located at the joint surface between the yoke and the lower center magnetic steel.

6. The sound generating unit according to claim 1, characterized in that: The waterproof and breathable membrane is arranged on the top of the upper center magnetic steel.

7. The sound generating unit according to claim 1, characterized in that: The waterproof and breathable membrane is provided at the bottom of the upper center magnetic steel.

8. The sound generating unit according to claim 1, characterized in that: The waterproof and breathable membranes are respectively provided on the top and bottom of the upper center magnetic steel.

9. The sound generating unit according to claim 1, characterized in that: The air flow channel is in communication with the bottom surface of the yoke.

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