Microphone module

Abstract

The invention relates to a microphone module. The microphone module comprises a shell, a microphone, a drainage structure, a waterproof film and a limiting piece, the housing has a recess. The microphone is arranged in the shell and corresponds to the recess. The drainage structure is arranged on the shell and comprises a first channel and a second channel which are communicated. A first sound hole of the first channel is exposed out of the shell, and a second sound hole of the second channel corresponds to the microphone. The waterproof film is arranged in the recess and located between the microphone and the second sound hole. The limiting member is arranged in the recess and is located between the microphone and the waterproof film.

Description

Technical Field

[0001] The present application relates to the field of microphone technology, and in particular to a microphone module. Background Art

[0002] The microphone module can be set outside an object to receive sound. The microphone module includes a sound hole and a microphone. Sound waves in the external environment enter the microphone module through the sound hole and are transmitted to the microphone. Water flow and dust in the external environment will also enter the microphone module through the sound hole, affecting the microphone's sound reception effect. Specifically, the current microphone module has a poor drainage effect. When a high-temperature and high-pressure water column enters the microphone module, the water column will impact the microphone and damage it, causing the microphone module to fail. Summary of the invention

[0003] Based on this, the present invention provides a microphone module that can protect the microphone.

[0004] The microphone module of the present invention comprises a housing, a microphone, a drainage structure, a waterproof membrane and a stopper. The housing has a recess. The microphone is arranged in the housing and corresponds to the recess. The drainage structure is arranged in the housing and comprises a first channel and a second channel that are connected. The first sound hole of the first channel is exposed to the housing, and the second sound hole of the second channel corresponds to the microphone. The waterproof membrane is arranged in the recess and is located between the microphone and the second sound hole. The stopper is arranged in the recess and is located between the microphone and the waterproof membrane.

[0005] In one embodiment, there is a first gap between the limiting member and the waterproof membrane, and the first gap is greater than or equal to 0.1 mm and less than or equal to 1 mm.

[0006] In one embodiment, the rigidity of the limiting member is greater than the rigidity of the waterproof membrane, and the rigidity of the limiting member is greater than 50 MPa.

[0007] In one embodiment, the air permeability of the stopper is greater than the air permeability of the waterproof membrane, and the air permeability of the stopper is greater than 100 mm / s.

[0008] In one embodiment, the first sound hole includes a plurality of first sub-sound holes, and the second sound hole includes a plurality of second sub-sound holes.

[0009] In one embodiment, a plurality of second sub-sound holes are formed on the bottom surface of the recess.

[0010] In one embodiment, there is a second gap between the waterproof membrane and the bottom surface, and the second gap is greater than or equal to 0.1 mm and less than or equal to 3 mm.

[0011] In one embodiment, the material of the limiting member is mesh.

[0012] In one of the embodiments, the microphone module further includes a plurality of layers of colloid, and the plurality of layers of colloid are disposed in the recess of the housing.

[0013] In one embodiment, the waterproof membrane and the stopper are respectively sandwiched between any two layers of the multi-layer colloid, and are connected to the housing through the multi-layer colloid.

[0014] In one embodiment, the microphone module further includes a circuit component and a circuit board, the circuit board is disposed in the shell, the circuit component is at least partially disposed in the shell, and the microphone is connected to the circuit board.

[0015] Based on the above, the limiter of the microphone module of the present invention is arranged between the microphone and the waterproof membrane. Therefore, when the water column flows into the microphone module and impacts the waterproof membrane, the waterproof membrane can limit the deformation range due to contact with the limiter. The limiter can support the waterproof membrane to prevent the waterproof membrane from breaking and damaging the microphone module. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] FIG. 1A is a cross-sectional view of a microphone module according to an embodiment of the present invention.

[0017] FIG. 1B is a partial enlarged view of the microphone module of FIG. 1A .

[0018] FIG. 2 is a rear view of the microphone module of FIG. 1A .

[0019] FIG. 3 is a top view of the microphone module of FIG. 1A .

[0020] FIG. 4A is a cross-sectional view of a microphone module according to another embodiment of the present invention.

[0021] FIG. 4B is a partial enlarged view of the microphone module of FIG. 4A .

[0022] FIG. 5 is a top view of the microphone module of FIG. 4A .

[0023] FIG. 6 is a cross-sectional view of a microphone module according to another embodiment of the present invention.

[0024] FIG. 7 is a cross-sectional view of a microphone module according to another embodiment of the present invention.

[0025] FIG. 8 is a cross-sectional view of a microphone module according to another embodiment of the present invention.

[0026] FIG. 9 is a cross-sectional view of a microphone module according to another embodiment of the present invention.

[0027] Description of Figure Numbers:

[0028] A1, A3: Angle

[0029] A2: Angle

[0030] C: Center

[0031] D1: Distance

[0032] D2, D3: length

[0033] G1: First gap

[0034] G2: Second gap

[0035] H1, H2: aperture

[0036] L1: First extension axis

[0037] L2: Second extension axis

[0038] L3: The third extension axis

[0039] N1: First normal

[0040] N2: Second normal

[0041] P: Cavity

[0042] S1: first outer surface

[0043] S2: Second outer surface

[0044] S3: The third outer surface

[0045] W1, W2: hole depth

[0046] XYZ: Cartesian coordinates

[0047] 100, 100a, 100b, 100c, 100d, 100e: Microphone module

[0048] 110, 110d: Shell

[0049] 111: First shell

[0050] 112: Second shell

[0051] 113: Depression 114, 1361: Bottom

[0052] 115: Inner surface

[0053] 120: Microphone

[0054] 130, 130b, 130c, 130d, 130e: drainage structure

[0055] 131, 131d, 131e: First channel

[0056] 132, 132b, 132c: Second channel

[0057] 133, 133a: First sound hole

[0058] 1331: First consonant hole

[0059] 134, 134c, 134d, 134e: Drainage holes

[0060] 1341: Sub-drain hole

[0061] 135: Part 1

[0062] 136, 136c, 136d, 136e: Part 2

[0063] 137: Second connection terminal

[0064] 138, 138a, 138c: Second sound hole

[0065] 1381: Second consonant hole

[0066] 139: first connection end

[0067] 140, 140', 140'': waterproof membrane

[0068] 150: Circuit board

[0069] 151: Opening

[0070] 160: Line Components

[0071] 170: Limiting piece

[0072] 180:Multilayer colloid DETAILED DESCRIPTION

[0073] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0074] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0075] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0076] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated 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, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0077] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0078] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0079] FIG. 1A is a cross-sectional view of a microphone module according to an embodiment of the present invention. FIG. 1B is a partial enlarged view of the microphone module of FIG. 1A. FIG. 2 is a rear view of the microphone module of FIG. 1A. FIG. 3 is a top view of the microphone module of FIG. 1A. Rectangular coordinates XYZ are provided here to facilitate component description. Please refer to FIG. 1A to FIG. 3 at the same time. The microphone module 100 includes a housing 110, a microphone 120, a drainage structure 130, a waterproof membrane 140 and a stopper 170. The housing 110 has a recess 113. The microphone 120 is disposed in the housing 110 and corresponds to the recess 113. The drainage structure 130 is disposed in the housing 110 and includes a first channel 131 and a second channel 132 that are connected. The first sound hole 133 and the drainage hole 134 of the first channel 131 are exposed to the housing 110. The second sound hole 138 of the second channel 132 corresponds to the microphone 120. The waterproof membrane 140 is disposed in the recess 113 and between the microphone 120 and the second sound hole 138 to protect the microphone 120. The stopper 170 is disposed in the recess 113 and between the microphone 120 and the waterproof membrane 140 to protect the waterproof membrane 140.

[0080] The first normal line N1 of the first sound hole 133 is perpendicular to the second normal line N2 of the second sound hole 138, so that the first sound hole 133 and the second sound hole 138 are staggered from each other. The first normal line N1 is parallel to the Z axis, and the second normal line N2 is parallel to the X axis. The first sound hole 133 and the drainage hole 134 are connected to the external environment. The sound waves in the external environment enter the microphone module 100 from the first sound hole 133 and are transmitted to the second sound hole 138 through the drainage structure 130, and then transmitted to the microphone 120. Rainwater or dust in the external environment can also enter the microphone module 100 through the first sound hole 133. In general, since the first sound hole 133 and the second sound hole 138 are staggered from each other, when external water columns and dust enter the microphone module 100, the water columns and dust move along the first channel 131 and leave the microphone module 100 from the drainage hole 134 without affecting the microphone 120, so that the microphone module 100 maintains good sound reception quality.

[0081] When the water column entering the microphone module 100 is too strong, the water column flows into the second channel 132 and impacts the waterproof membrane 140. In this embodiment, when the water column impacts the waterproof membrane 140 and causes the waterproof membrane 140 to deform, the limiter 170 is used to support the waterproof membrane 140 to limit the deformation of the waterproof membrane 140. This can prevent the waterproof membrane 140 from being damaged due to excessive deformation, thereby damaging the microphone 120. Through the limiter 170, the microphone module 100 of this embodiment can reach the highest level of waterproof and dustproof IP69K.

[0082] As shown in FIG. 1A and FIG. 2 , the microphone module 100 further includes a circuit board 150 and a circuit assembly 160. The housing 110 includes a first housing 111 and a second housing 112 connected to each other. The material of the first housing 111 and the second housing 112 may be plastic, but is not limited thereto. The second housing 112 and the first housing 111 together form a cavity P, and the microphone 120 is located in the cavity P. The first housing 111 of the housing 110 includes a first outer surface S1 and a second outer surface S2 connected to each other, and an inner surface 115 having a recess 113. The first sound hole 133 is located on the first outer surface S1, and the drainage hole 134 is located on the second outer surface S2, but is not limited thereto. The drainage structure 130 and the waterproof membrane 140 are buried in the first housing 111. The circuit board 150 is disposed in the cavity P of the housing 110 and is located between the stopper 170 and the microphone 120. The circuit board 150 includes an opening 151 corresponding to the second sound hole 138. The microphone 120 is connected to the circuit board 150 and covers the opening 151. The aperture of the opening 151 is greater than or equal to 0.6 mm. The circuit assembly 160 is at least partially disposed in the cavity P of the housing 110.

[0083] FIG1B illustrates the deformed waterproof membrane 140' with a dotted line. As shown in FIG1B , there is a first gap G1 between the stopper 170 and the waterproof membrane 140, and the first gap G1 is greater than or equal to 0.1 mm and less than or equal to 1 mm. When the water column impacts the waterproof membrane 140', the waterproof membrane 140' may be deformed and contact the stopper 170. Compared to the conventional microphone module without the stopper 170, the stopper 170 of this embodiment can limit the waterproof membrane 140 from rupture due to excessive deformation, so it can withstand the impact of a stronger water column to protect the microphone module 100.

[0084] The rigidity of the stopper 170 is greater than the rigidity of the waterproof membrane 140, and the rigidity of the stopper 170 may be, for example, greater than 50 MPa. The air permeability of the stopper 170 is greater than the air permeability of the waterproof membrane 140, so that the stopper 170 can be prevented from affecting the sensitivity of the microphone 120. The air permeability of the stopper 170 may be, for example, greater than 100 mm / s. The material of the stopper 170 is, for example, mesh cloth, but is not limited thereto.

[0085] The first channel 131 of the drainage structure 130 includes a first portion 135 and a second portion 136 connected to each other. The first portion 135 is connected to the first sound hole 133 and the second channel 132, and extends along the first extension axis L1. The first portion 135 intersects with the second channel 132 at the first connection end 139, and intersects with the second portion 136 at the second connection end 137. The second portion 136 is connected to the drainage hole 134, and extends along the second extension axis L2. The first sound hole 133 and the second connection end 137 are connected to opposite ends of the first channel 131. The second connection end 137 and the drainage hole 134 are connected to opposite ends of the second channel 132. The first extension axis L1 of this embodiment coincides with the first normal line N1 and is parallel to the Z axis, and the second extension axis L2 is different from the first extension axis L1, but is not limited thereto. An angle A1 is formed between the first extension axis L1 and the second extension axis L2. The angle A1 is greater than 90 degrees and less than 180 degrees. The angle A1 is an obtuse angle.

[0086] As shown in FIG. 1A , the second channel 132 extends along the third extension axis L3. An angle A2 is formed between the third extension axis L3 and the first normal line N1, and the angle A2 may be greater than zero and less than or equal to 90 degrees. The first connecting end 139 and the second sound hole 138 are connected to opposite ends of the second channel 132. The third extension axis L3 of this embodiment coincides with the second normal line N2 of the second sound hole 138 and is parallel to the X-axis, but is not limited thereto. It can be understood that the angle between the second normal line N2 and the third extension axis L3 is equal to zero degrees. The angle A2 between the third extension axis L3 (second normal line N2) and the first normal line N1 is equal to 90 degrees.

[0087] The first connection end 139 is spaced apart from the second connection end 137 by a distance D1, and the distance D1 is greater than or equal to 3 mm. Specifically, the center C of the first connection end 139 is spaced apart from the second connection end 137 by a distance D1, and the center C is located on the third extension axis L3. It can be understood that the third extension axis L3 is spaced apart from the second connection end 137 by a distance D1. When the external high-pressure water column enters the first portion 135 from the first sound hole 133 and impacts the bottom surface 1361 of the second portion 136, the distance D1 can prevent the water from flowing back into the second channel 132 to protect the microphone 120.

[0088] The sum of the length D2 of the first portion 135 along the first extension axis L1 and the length D3 of the second portion 136 along the second extension axis L2 is less than or equal to 17 mm to avoid the generation of the resonance frequency of the standing wave and affecting the sound reception quality of the microphone module 100. The width of the second channel 132 perpendicular to the third extension axis L3 is between 2 mm and 4 mm to prevent water from splashing into the second channel 132. As shown in Figures 2 and 3, the shapes of the first sound hole 133 and the drainage hole 134 can be rectangular, but are not limited to this. The width of the first sound hole 133 is preferably between 0.4 mm and 2 mm to prevent excessive dust or stones from entering the microphone module 100 from the first sound hole 133. In an embodiment not shown, the shapes of the first sound hole 133, the drainage hole 134 and the second sound hole 138 can be circular or any polygonal.

[0089] The microphone module 100 further includes a multilayer colloid 180. The multilayer colloid 180 is disposed in a local area of ​​the recess 113 of the housing 110, and the waterproof membrane 140 and the stopper 170 are respectively sandwiched between any two layers of the multilayer colloid 180, and are connected to the housing 110 through the multilayer colloid 180. The multilayer colloid 180 is, for example, an adhesive, a waterproof adhesive, a double-sided tape or an adhesive, and is disposed in the first housing 111 to bond the waterproof membrane 140 and the stopper 170 to the first housing 111, respectively.

[0090] FIG. 4A is a cross-sectional view of a microphone module according to another embodiment of the present invention. FIG. 4B is a partial enlarged view of the microphone module of FIG. 4A. FIG. 5 is a top view of the microphone module of FIG. 4A. Please refer to FIG. 1A and FIG. 4A to FIG. 5 simultaneously. The microphone module 100a of this embodiment is similar to the aforementioned embodiment. The difference between the two is that the first sound hole 133a of this embodiment includes a plurality of first sub-sound holes 1331, and the second sound hole 138a includes a plurality of second sub-sound holes 1381. The recess 113 of the housing 110 includes a bottom surface 114, and the plurality of second sub-sound holes 1381 are formed on the bottom surface 114 of the recess 113, and a second gap G2 is provided between the waterproof membrane 140 and the bottom surface 114. The second gap G2 is greater than or equal to 0.1 mm and less than or equal to 3 mm. Specifically, the second gap G2 of this embodiment is greater than or equal to 0.5 mm and less than or equal to 3 mm, but is not limited thereto. In other embodiments, the second gap G2 may be greater than or equal to 0.1 mm and less than or equal to 1 mm.

[0091] FIG4B shows the deformed waterproof membrane 140'' with dotted lines. As shown in FIG4B , when the water column leaves the second channel 132 and causes the waterproof membrane 140 to deform, the second gap G2 can prevent the deformed waterproof membrane 140'' from contacting and adhering to the bottom surface 114 of the recess 113. It can be understood that the deformation range of the waterproof membrane 140'' is smaller than the second gap G2. Thus, the sound characteristics of the microphone 120 can be prevented from being affected.

[0092] As shown in FIG4A , the hole diameter H1 of each first sub-sound hole 1331 (i.e., the width of the first sub-sound hole 1331 along the perpendicular direction to the first normal line N1) is between 0.2 mm and 1 mm, and the hole depth W1 (i.e., the length of the first sub-sound hole 1331 along the first normal line N1) is between 0.5 mm and 1 mm. The hole diameter H2 of each second sub-sound hole 1381 (i.e., the width of the second sub-sound hole 1381 along the perpendicular direction to the second normal line N2) is between 0.2 mm and 1 mm, and the hole depth W2 (i.e., the length of the second sub-sound hole 1381 along the second normal line N2) is between 0.5 mm and 1 mm. Thus, when an external water column passes through the first sound hole 133a and the second sound hole 138a, the impact of the water column can be mitigated by the first sub-sound holes 1331 and the second sub-sound holes 1381, so as to protect the microphone 120. The microphone module 100a of this embodiment has the same functions as those of the aforementioned embodiments, and will not be described in detail herein.

[0093] FIG6 is a cross-sectional view of a microphone module according to another embodiment of the present invention. Please refer to FIG1A and FIG6 simultaneously. The microphone module 100b of this embodiment is similar to the aforementioned embodiment. The difference between the two is that the second normal N2 of the second sound hole 138 of this embodiment is different from the third extension axis L3 of the second channel 132b. The angle A3 between the second normal N2 and the third extension axis L3 is greater than zero and less than 90 degrees. The angle A2 between the third extension axis L3 and the first normal N1 is greater than zero and less than 90 degrees, and the angle A2 is an acute angle. Therefore, when an external water column enters the drainage structure 130b, it can further prevent the water column from flowing from the second channel 132b into the second sound hole 138 and damaging the microphone 120. The microphone module 100b of this embodiment has the same effect as the aforementioned embodiment, which will not be repeated here.

[0094] FIG7 is a cross-sectional view of a microphone module according to another embodiment of the present invention. Please refer to FIG1A and FIG7 simultaneously. The microphone module 100c of this embodiment is similar to the aforementioned embodiment. The difference between the two is that the width of the second portion 136c of the drainage structure 130c of this embodiment at a direction perpendicular to the second extension axis L2 changes along the second extension axis L2. The width of the second channel 132c at a direction perpendicular to the third extension axis L3 changes along the third extension axis L3. Specifically, the width of the second portion 136c gradually expands from the second connection end 137 to the drainage hole 134c along the second extension axis L2, and the width of the second connection end 137 is smaller than the width of the drainage hole 134c. The width of the second channel 132c gradually expands from the first connection end 139 to the second sound hole 138c along the third extension axis L3, and the width of the first connection end 139 is smaller than the width of the second sound hole 138c. In an embodiment not shown, the width of the second portion 136c may gradually expand from the second sound hole to the first connection end 139 along the third extension axis L3, and the width of the second sound hole is smaller than the width of the first connection end 139. The microphone module 100c of this embodiment has the same function as the above embodiment, which will not be described again.

[0095] FIG8 is a cross-sectional view of a microphone module according to another embodiment of the present invention. Please refer to FIG1A and FIG8 simultaneously. The microphone module 100d of this embodiment is similar to the aforementioned embodiment. The difference between the two is that the first channel 131d of the drainage structure 130d of this embodiment extends along the first normal line N1 of the first sound hole 133, and the drainage hole 134d is located on the first normal line N1. In other words, the first normal line N1, the first extension axis L1 and the second extension axis L2 coincide with each other. The angle between the first extension axis L1 and the second extension axis L2 is equal to 180 degrees. The first shell 111d of the shell 110d also includes a third outer surface S3, the third outer surface S3 is relative to the first outer surface S1, and the second outer surface S2 is connected between the first outer surface S1 and the third outer surface S3. The first sound hole 133 is located on the first outer surface S1, and the drainage hole 134d is located on the third outer surface S3. The microphone module 100d of this embodiment has the same function as the aforementioned embodiment, which will not be repeated here.

[0096] FIG9 is a cross-sectional view of a microphone module according to another embodiment of the present invention. Please refer to FIG2 and FIG9 simultaneously. The microphone module 100e of this embodiment is similar to the aforementioned embodiment. The difference between the two is that the first channel 131e of the drainage structure 130e of this embodiment includes a plurality of second parts 136e. The drainage hole 134e includes a plurality of sub-drainage holes 1341. These second parts 136e intersect with the first part 135 at the second connecting end 137, and are respectively connected to these sub-drainage holes 1341. The number of sub-drainage holes 1341 is, for example, three, and the number of second parts 136e is, for example, three but not limited thereto. The total length of each second part 136e and the first part 135 is 17 mm. The microphone module 100e of this embodiment has the same function as the aforementioned embodiment, which will not be repeated here.

[0097] The arrangement of the drainage structure 130, 130b, 130c, 130d, 130e of the microphone module 100, 100a, 100b, 100c, 100d, 100e is not limited to the above embodiments. The structures of the first sound hole 133, 133a, the second sound hole 138, 138a, the second channel 132, 132b, 132c and the second part 136, 136c, 136d, 136e can be any combination of any of the above embodiments.

[0098] In summary, the position-limiting member of the microphone module of the present invention is disposed between the microphone and the waterproof membrane. Thus, when a water column flows into the microphone module and impacts the waterproof membrane, the waterproof membrane is limited in deformation range due to contact with the position-limiting member. The position-limiting member can support the waterproof membrane to prevent the waterproof membrane from cracking and damaging the microphone module.

[0099] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0100] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A microphone module, It is characterized in that The microphone module comprises: a housing having a recess; a microphone, disposed in the housing and corresponding to the recess; a drainage structure, disposed on the housing and comprising a first channel and a second channel in communication, wherein a first sound hole of the first channel is exposed outside the housing, and a second sound hole of the second channel corresponds to the microphone; a waterproof membrane disposed in the recess and between the microphone and the second sound hole; and A limiting member is arranged in the recess and located between the microphone and the waterproof membrane.

2. The microphone module according to claim 1, It is characterized in that There is a first gap between the limiting member and the waterproof membrane, and the first gap is greater than or equal to 0.1 mm and less than or equal to 1 mm.

3. The microphone module according to claim 1, It is characterized in that The rigidity of the limiting member is greater than the rigidity of the waterproof membrane, and the rigidity of the limiting member is greater than 50 MPa.

4. The microphone module according to claim 1, It is characterized in that The air permeability of the stopper is greater than the air permeability of the waterproof membrane, and the air permeability of the stopper is greater than 100 mm / s.

5. The microphone module according to claim 1, It is characterized in that The first sound hole includes a plurality of first sub-sound holes, and the second sound hole includes a plurality of second sub-sound holes.

6. The microphone module according to claim 5, It is characterized in that The plurality of second sub-sound holes are formed on the bottom surface of the depression.

7. The microphone module according to claim 6, It is characterized in that A second gap is provided between the waterproof membrane and the bottom surface, and the second gap is greater than or equal to 0.1 mm and less than or equal to 3 mm.

8. The microphone module according to claim 1, It is characterized in that The material of the limiting member is mesh.

9. The microphone module according to claim 1, It is characterized in that The microphone module further includes a multi-layer colloid, and the multi-layer colloid is arranged in the recess of the shell.

10. The microphone module according to claim 9, It is characterized in that The waterproof membrane and the limiting component are respectively sandwiched between any two layers of the multi-layer colloid, and are connected to the shell through the multi-layer colloid.

11. The microphone module according to claim 1, It is characterized in that The microphone module also includes a circuit component and a circuit board. The circuit board is disposed in the shell. The circuit component is at least partially disposed in the shell. The microphone is connected to the circuit board.

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