WO2024061027A1

WO2024061027A1 - Transducer and electronic device

Info

Publication number: WO2024061027A1
Application number: PCT/CN2023/117737
Authority: WO
Inventors: 赵文强
Original assignee: 歌尔微电子股份有限公司
Priority date: 2022-09-20
Filing date: 2023-09-08
Publication date: 2024-03-28
Also published as: CN115426596A

Abstract

The present application provides a transducer and an electronic device. The transducer comprises a substrate, a housing covering the substrate, and a solder ring connecting the substrate and the shell. The housing is fitted to the substrate to form an accommodating cavity, and a MEMS chip and an ASIC chip which have a signal connection are disposed in the accommodating cavity. A sound hole is provided in the substrate, and a waterproof film is disposed at the sound hole so as to block water from entering the accommodating cavity via the sound hole. An air leakage path is formed in the solder ring, the air leakage path comprising a first through hole facing the accommodating cavity and a second through hole facing away from the accommodating cavity, so that the accommodating cavity and the outside are in communication via the air leakage path.

Description

Transducers and electronic equipment

This application claims priority to the Chinese patent application with application number 202211144960.6 filed on September 20, 2022, the entire content of which is incorporated into this application by reference.

Technical field

The present application relates to the field of transducer technology, and in particular, to a transducer and electronic equipment.

Background technique

When manufacturing a transducer that requires deep water waterproofing, it is necessary to set a waterproof membrane at the sound hole of the transducer to prevent water from entering the interior of the transducer through the sound hole; in deep water waterproofing, the waterproof membrane used often also has the function of preventing air from penetrating.

technical problem

Among the above, setting up a waterproof membrane will cause the interior of the transducer to be closed. When the internal air pressure of the transducer is too high (such as high temperature and other environments), a tympanic membrane will be formed, and in severe cases, the diaphragm will be damaged.

In view of this, it is necessary to provide a new transducer and electronic device to solve or at least alleviate the above technical shortcomings.

Technical solutions

The main purpose of this application is to provide a transducer and electronic equipment, aiming to solve the technical problem in the prior art that a transducer with a deep water waterproof function will produce an eardrum.

In order to achieve the above object, according to one aspect of the present application, the present application provides a transducer, which includes a base plate, a shell covering the base plate, and a welding ring connecting the base plate and the shell, and the shell is connected to the shell. The substrate cooperates to form an accommodation cavity, and a MEMS chip and an ASIC chip for signal connection are provided in the accommodation cavity. A sound hole is provided on the substrate, and a waterproof membrane is provided at the sound hole to prevent water from entering the sound hole. The accommodating cavity, the welding ring is formed with a vent passage, the vent passage includes a first through hole toward the accommodating cavity and a second through hole away from the accommodating cavity, so as to communicate with the accommodating cavity through the vent passage. cavity and the outside world.

In one embodiment, the vent passage bends and extends within the welding ring.

In one embodiment, the welding ring is in a zigzag shape, and the first through hole and the second through hole are arranged close to each other. The welding ring also includes an inner ring, an outer ring and a separator. The inner ring is provided with The vent passage is formed inside the outer ring, between the inner ring and the outer ring, and the two ends of the partition are respectively connected to the inner ring and the outer ring, and the partition Separate the first through hole and the second through hole.

In one embodiment, the first through hole and the second through hole are respectively located at both ends of the air release passage.

In one embodiment, the welding ring is in a zigzag shape, and the second through hole is disposed on a side away from the first through hole.

In one embodiment, the vent passage is filled with sound-absorbing material.

In one embodiment, the welding ring is made of copper foil.

In one embodiment, the waterproof membrane includes a membrane body and a base material connected to a side of the substrate away from the accommodation cavity, the membrane body is sealingly connected to the base material, and the waterproof membrane is connected to the base material. Sound hole spacing setting.

In one embodiment, the waterproof membrane is a silicone rubber membrane, a polyimide membrane, or a polyphenylene sulfide resin membrane.

In one embodiment, the transducer is a MEMS microphone.

According to another aspect of the present application, the present application also provides an electronic device, which includes a housing and the above-mentioned transducer disposed in the housing.

beneficial effects

In the above scheme, the transducer includes a substrate, a shell covering the substrate, and a welding ring connecting the substrate and the shell, the shell and the substrate cooperate to form a housing cavity, a MEMS chip and an ASIC chip connected to the signal are arranged in the housing cavity, a sound hole is arranged on the substrate, a waterproof film is arranged at the sound hole to prevent water from entering the housing cavity from the sound hole, and an air leakage passage is formed in the welding ring, the air leakage passage includes a first through hole facing the housing cavity and a second through hole away from the housing cavity, so as to connect the housing cavity with the outside world through the air leakage passage. In the above scheme, the transducer includes a substrate and a shell covering the substrate, the shell and the substrate cooperate to form a housing cavity, a MEMS chip and an ASIC chip connected to the signal are arranged in the housing cavity, a sound hole is arranged on the substrate, a waterproof film is arranged at the sound hole to prevent water from entering the housing cavity from the sound hole, and an air leakage passage is formed in the housing, the air leakage passage includes a first through hole facing the housing cavity and a second through hole away from the housing cavity, so as to connect the housing cavity with the outside world through the air leakage passage. In the above scheme, the substrate plays the role of load support, circuit connection and signal transmission. The MEMS chip and the ASIC chip can be connected by gold wires. The ASIC chip is connected to the substrate by gold wires. The gold wires provide circuit connection and signal transmission functions. The MEMS chip and the ASIC chip provide sound-to-electric conversion functions. The waterproof membrane can prevent air and water from entering the accommodating cavity from the sound hole. At the same time, the waterproof membrane has good compliance and vibration characteristics, so that the sound can be smoothly transmitted to the MEMS chip through the waterproof membrane with less sound loss. In general, in order to prevent the eardrum, which may cause the diaphragm to rupture in severe cases, the air pressure inside the accommodating cavity cannot be too high. One way is to set an air release line on the diaphragm of the MEMS chip to balance the internal and external air pressure. However, for scenarios with relatively high waterproof requirements, such as deep water waterproofing, the water pressure reaches 5 atmospheres. In order to prevent water from entering the transducer from the sound hole, a waterproof membrane will be set at the sound hole. In this way, the air inside the accommodating cavity is blocked by the waterproof membrane after passing through the air release line and cannot be discharged. It is possible that the eardrum phenomenon is caused by excessive air pressure in the accommodating cavity. In the technical solution of the present application, an air leakage passage is provided on the welding ring, and the air leakage passage includes a first through hole facing the accommodating cavity and a second through hole away from the accommodating cavity, so as to connect the accommodating cavity with the outside world through the air leakage passage, so that the air in the accommodating cavity can enter the air leakage passage through the first through hole and be discharged through the second through hole. That is, the air pressure in the accommodating cavity and the outside world can be balanced, thereby avoiding the occurrence of rupture of the eardrum or even the diaphragm. This technical solution has the advantage of being able to prevent the transducer from causing the eardrum phenomenon due to excessive air pressure in the accommodating cavity.

Description of the drawings

In order to more clearly explain the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are only These are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on the structures shown in these drawings without exerting creative efforts.

Figure 1 is a schematic cross-sectional structural diagram of a transducer according to an embodiment of the present application;

Figure 2 is a schematic structural diagram of a welding ring and a vent channel according to an embodiment of the present application;

Figure 3 is a schematic cross-sectional structural view of the housing, welding ring and vent channel according to an embodiment of the present application;

Figure 4 is another cross-sectional structural schematic diagram of the housing, welding ring and vent channel according to an embodiment of the present application;

Figure 5 is a schematic structural diagram of a welding ring and a vent channel according to another embodiment of the present application;

FIG. 6 is a schematic structural diagram of a welding ring and an air leakage channel according to another embodiment of the present application.

Explanation of reference numbers:

1. Base plate; 2. Shell; 3. Accommodating cavity; 4. Welding ring; 41. Inner ring; 42. Outer ring; 43. Separator; 5. Waterproof membrane; 51. Base material; 52. Membrane body; 6. MEMS chip; 7. ASIC chip; 8. Vent passage; 81. First through hole; 82. Second through hole; 9. Sound hole; 10. Gold wire; 11. Sound-absorbing material; 12. Waterproof and breathable membrane.

The realization of the purpose, functional features and advantages of the present application will be further explained in combination with the implementation mode and with reference to the accompanying drawings.

Implementation Mode of this Application

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all of them. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of this application.

It should be noted that all directional indications (such as up, down...) in the embodiments of this application are only used to explain the relative positional relationship, movement, etc. between the components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication changes accordingly.

In addition, descriptions such as "first", "second", etc. in this application are for descriptive purposes only and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of indicated technical features. Therefore, features defined as "first" and "second" may explicitly or implicitly include at least one of these features.

In addition, the technical solutions in the various embodiments of the present application can be combined with each other, but it must be based on the realization by those of ordinary skill in the art. When the combination of technical solutions is contradictory or cannot be realized, it should be considered that such a combination of technical solutions is possible. It does not exist and is not within the protection scope required by this application.

Referring to Figures 1 to 6, according to one aspect of the present application, the present application provides a transducer, including a substrate 1, a shell 2 covering the substrate 1, and a welding ring 4 connecting the substrate 1 and the shell 2. The shell 2 and The substrate 1 cooperates to form an accommodation cavity 3. A MEMS chip 6 and an ASIC chip 7 for signal connection are provided in the accommodation cavity 3. A sound hole 9 is provided on the substrate 1, and a waterproof membrane 5 is provided at the sound hole 9 to prevent water from entering through the sound hole 9. The accommodating cavity 3 and the welding ring 4 are formed with a vent passage 8. The vent passage 8 includes a first through hole 81 facing the accommodating cavity 3 and a second through hole 82 away from the accommodating cavity 3, so as to connect the accommodating cavity 3 and the outside world through the vent passage 8. .

In the above solution, the transducer includes a substrate 1 and a shell 2 covering the substrate 1. The shell 2 cooperates with the substrate 1 to form an accommodation cavity 3. The accommodation cavity 3 is provided with a MEMS chip 6 and an ASIC chip 7 for signal connection. The substrate 1 A sound hole 9 is provided on the top, and a waterproof membrane 5 is provided at the sound hole 9 to prevent water from entering the accommodation cavity 3 from the sound hole 9. A vent passage 8 is formed in the housing 2, and the vent passage 8 includes a first through hole 81 facing the accommodation cavity 3. and a second through hole 82 facing away from the accommodation cavity 3 to communicate the accommodation cavity 3 and the outside world through the air release passage 8 . In the above solution, the shell 2 can be a metal shell, and the substrate 1 functions as load support, circuit connection and signal transmission. The MEMS chip 6 and the ASIC chip 7 can be connected through the gold wire 10, and the ASIC chip 7 can also be connected to the substrate 1 through the gold wire 10. connection, the gold wire 10 provides circuit connection and signal transmission functions, the MEMS chip 6 and the ASIC chip 7 provide the sound-to-electricity conversion function, the waterproof membrane 5 can prevent air and water from entering the accommodation cavity 3 from the sound hole 9, and the waterproof membrane 5 5 has good compliance and vibration characteristics, so that sound can be smoothly transmitted to the MEMS chip 6 through the waterproof membrane 5 with small sound loss. Under normal circumstances, in order to prevent the eardrum from rupturing the diaphragm in severe cases, the air pressure inside the accommodation cavity 3 cannot be too high. One way is to set a deflation line on the diaphragm to balance the internal and external air pressure. However, for scenarios with relatively high waterproofing requirements, such as deep water level waterproofing, the water pressure reaches 5 atmospheres. In order to prevent water from entering the transducer from the sound hole 9, a waterproof membrane 5 will be installed at the sound hole 9, so that , the air inside the accommodation cavity 3 is blocked by the waterproof membrane 5 after passing through the deflation line and cannot be discharged. It is possible that the air pressure in the accommodation cavity 3 is too high, causing a tympanic membrane phenomenon. In this embodiment, a vent passage 8 is provided on the welding ring 4, and the vent passage 8 includes a first through hole 81 facing the accommodation cavity 3 and a second through hole 82 away from the accommodation cavity 3, so that the accommodation is connected through the vent passage 8. The air in the cavity 3 can enter the air release passage 8 through the first through hole 81 and be discharged through the second through hole 82 . That is to say, the accommodation cavity 3 and the external air pressure can be balanced to avoid the occurrence of tympanic membrane or even diaphragm rupture. This embodiment has the advantage of being able to prevent the transducer from causing a tympanic membrane phenomenon due to excessive air pressure in the accommodation cavity 3 , especially for transducers that are deep-water waterproof. Specifically, the waterproof membrane 5 is a silicone rubber membrane, a polyimide membrane, or a polyphenylene sulfide resin membrane.

Referring to FIG. 2 , in one embodiment, the vent passage 8 is bent and extended within the welding ring 4 . Setting a vent passage 8 in the welding ring 4 can achieve venting and balance the air pressure inside and outside the accommodation cavity 3. At the same time, in order to prevent external sounds from entering through the second through hole 82, the vent passage 8 can be set in a bend, thus increasing the size of the accommodation cavity 3. The passage between the outside world and the outside world increases the sound resistance. Even if the outside sound wave enters the vent passage 8 through the second through hole 82, the sound wave will be completely lost in the vent passage 8 with a certain length, thereby preventing the external sound wave from passing through the second through hole 82. The two through holes 82 enter the accommodating cavity 3 inside the transducer, which ensures air leakage and avoids the occurrence of acoustic short circuit. Acoustic short circuit means that sound waves enter the accommodating cavity 3 from the acoustic hole 9 and the second through hole 82 at the same time. At the same time, the bending arrangement of the vent passage 8 also increases the difficulty for water to flow into the accommodation cavity 3 from the second through hole 82, thereby preventing external water from entering the accommodation cavity 3 of the transducer.

Referring to FIGS. 2 to 5 , in one embodiment, the welding ring 4 is in a back shape, with the first through hole 81 and the second through hole 82 being disposed close to each other. The welding ring 4 also includes an inner ring 41 , an outer ring 42 and a separator 43 , the inner ring 41 is disposed inside the outer ring 42, a vent passage 8 is formed between the inner ring 41 and the outer ring 42, the two ends of the partition 43 are connected to the inner ring 41 and the outer ring 42 respectively, and the partition 43 separates the first through hole 81 and second through hole 82 . Both the inner ring 41 and the outer ring 42 are connected to the housing 2 and the substrate 1. The inner ring 41 and the outer ring 42 are both made of copper foil. When the first through hole 81 and the second through hole 82 are arranged close to each other, they are separated by the partition 43. The first through hole 81 and the second through hole 82 are separated, so that external sound waves can only enter from the first through hole 81 after passing through the entire vent passage 8 from the second through hole 82, instead of without the partition 43. Next, after entering from the second through hole 82, it directly enters the accommodating cavity 3 from the first through hole 81, thus increasing the propagation length of the external sound wave entering the accommodating cavity 3, thereby increasing the acoustic resistance so that the sound waves entering from the second through hole 82 The sound waves are completely lost in the deflation passage 8, thereby preventing external sound from entering the accommodation cavity 3 inside the transducer from the second through hole 82, thereby ensuring deflation while avoiding the occurrence of acoustic short circuit. The welding ring 4 can be made in one piece.

Referring to FIGS. 2 to 4 , in one embodiment, the first through hole 81 and the second through hole 82 are respectively located at both ends of the air release passage 8 . By arranging the first through hole 81 and the second through hole 82 at both ends of the vent passage 8 , the length of the vent passage 8 can be lengthened, thereby increasing the acoustic resistance so that the sound waves entering from the second through hole 82 are lost in the vent passage 8 This further prevents external sound from entering the accommodation cavity 3 inside the transducer from the second through hole 82, thereby avoiding the occurrence of acoustic short circuit while ensuring air leakage.

Referring to FIG. 6 , in one embodiment, the welding ring 4 is in a back shape, and the second through hole 82 is provided on the side away from the first through hole 81 , which can increase the length of the vent passage 8 and increase the sound loss while saving time. Without the production of the separator 43, the production of the welding ring 4 is simpler and the production cost is lower.

Referring to FIG. 5 , in one embodiment, the vent passage 8 is filled with sound-absorbing material 11 . The sound-absorbing material 11 can be filled in the vent passage 8 to increase the sound loss and further prevent sound waves from entering the accommodation cavity 3 from the second through hole 82 through the vent passage 8 . Specifically, the sound-absorbing material 11 can be sound-absorbing cotton or sound-absorbing particles, and the sound-absorbing particles can be made of melamine.

Referring to FIG. 5 , in one embodiment, the second through hole 82 is covered with a waterproof and breathable film 12 . The waterproof and breathable film 12 has a waterproof function and can effectively prevent external liquid from flowing into the transducer from the second through hole 82 . inside the cavity 3; and the air can flow freely through the waterproof and breathable membrane 12, which can ensure that the accommodation cavity 3 is connected to the outside world, and plays a role in balancing the internal and external sound pressure.

Referring to FIG. 1 , in one embodiment, the waterproof membrane 5 includes a membrane body 52 and a base material 51 connected to the side of the substrate 1 away from the accommodation cavity 3 . The membrane body 52 is sealingly connected to the base material 51 , and the waterproof membrane 5 is connected to the sound hole. 9 interval settings. The base material 51 can be arranged around the periphery of the sound hole 9, and the waterproof membrane 5 is placed facing the sound hole 9, and then the sound hole 9 is isolated from the outside world through a sealing connection between the membrane body 52 and the base material 51. The waterproof membrane 5 here can simultaneously play the role of The function of preventing air and water from entering, but since the sound signal needs to be transmitted through the vibration of the waterproof membrane 5, the waterproof membrane 5 is spaced apart from the sound hole 9 so that the waterproof membrane 5 can vibrate freely and better transmit the sound signal.

In one embodiment, the transducer is a MEMS microphone. The MEMS chip 6 can be used not only to detect sound signals, but also to detect functions such as ultrasonic waves and environmental parameters. The MEMS microphone is just a form of transducer.

According to another aspect of the present application, the present application also provides an electronic device. The electronic device includes a housing and the above-mentioned transducer disposed in the housing. Since the electronic device includes all the technical solutions of all the embodiments of the above-mentioned transducer, it has at least all the beneficial effects brought by all the above-mentioned technical solutions, which will not be described again here. The above-mentioned electronic device may be a portable device or a wearable device, such as a smartphone, a smart watch, a smart bracelet, or an IPAD, etc.

The above are only optional embodiments of the present application, and do not limit the patent scope of the present application. Under the technical concept of the present application, equivalent structural transformations made by using the contents of the description and drawings of the present application, or directly/indirectly applied in Other related technical fields are included in the patent protection scope of this application.

Claims

A transducer, wherein the transducer includes a base plate, a shell covering the base plate, and a welding ring connecting the base plate and the shell, the shell cooperates with the base plate to form an accommodation cavity, so A MEMS chip and an ASIC chip for signal connection are provided in the accommodation cavity, a sound hole is provided on the substrate, and a waterproof membrane is provided at the sound hole to prevent water from entering the accommodation cavity from the sound hole, and the welding ring An air leakage passage is formed, and the air leakage passage includes a first through hole toward the accommodation cavity and a second through hole away from the accommodation cavity, so as to communicate the accommodation cavity and the outside world through the air leakage passage.
The transducer according to claim 1, wherein the vent passage bends and extends within the welding ring.
The transducer according to claim 1, wherein the welding ring is in a U-shape, the first through hole and the second through hole are arranged close to each other, the welding ring further comprises an inner ring, an outer ring and a separator, the inner ring is arranged on the inner side of the outer ring, the air leakage passage is formed between the inner ring and the outer ring, the two ends of the separator are respectively connected to the inner ring and the outer ring, and the separator separates the first through hole and the second through hole.
The transducer according to claim 3, wherein the first through hole and the second through hole are respectively located at both ends of the vent passage.
The transducer according to claim 1, wherein the welding ring is in a U-shape, and the second through hole is arranged on a side away from the first through hole.
The transducer according to claim 1, wherein the vent passage is filled with sound-absorbing material.
The transducer according to any one of claims 1 to 6, wherein the welding ring is made of copper foil.
The transducer according to any one of claims 1 to 6, wherein the waterproof membrane includes a membrane body and a base material connected to a side of the substrate away from the accommodation cavity, the membrane body and the The base material is sealed and connected, and the waterproof membrane is spaced apart from the sound hole.
The transducer according to any one of claims 1 to 6, wherein the waterproof film is a silicone rubber film, a polyimide film, or a polyphenylene sulfide resin film.
The transducer according to any one of claims 1 to 6, wherein the transducer is a MEMS microphone.
An electronic device, wherein the electronic device includes a housing and the transducer according to any one of claims 1 to 10 provided in the housing.