Sound production device and electronic equipment

Abstract

The invention discloses a sound production device and electronic equipment, and relates to the technical field of electro-acoustic transformation.The sound production device is applied to the electronic equipment, the electronic equipment is provided with a complete machine rear cavity, the sound production device comprises a shell, a sound production single body and a waterproof breathable film, the shell is provided with an installation cavity and a sound outlet hole, and the shell is further provided with an air leakage channel; one end of the air leakage channel is communicated with a rear cavity of the whole machine, the sound production single body is arranged in the mounting cavity and divides the mounting cavity into a front sound cavity and a rear sound cavity, the front sound cavity is communicated with the sound outlet hole, the other end of the air leakage channel is communicated with the front sound cavity, and the waterproof breathable film covers the air leakage channel; the projection of at least part of the air leakage channel is located outside the projection of the front sound cavity in the vibration direction of the sound production single body. The invention aims to provide the sound production device capable of avoiding noise, the sound production device is applied to the electronic equipment, timely balance between the rear cavity of the whole machine and the atmospheric pressure is realized, the waterproof effect of the whole machine is ensured, and the noise is effectively avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of electroacoustic conversion, and in particular to a sound-generating device and an electronic device using the sound-generating device. Background Art

[0002] In recent years, convenient electronic devices (such as mobile phones, headphones, and computers) have become part of people's daily lives. With the rapid development of technology, people's demand for the sound quality of electronic devices has become higher and higher, and full-range and miniaturized speakers have become mainstream demands.

[0003] At present, the gap space of the whole back cavity of electronic equipment is getting smaller and smaller, and the sealing of the whole back cavity is getting better and better. Since the whole back cavity cannot be vented, when the electronic equipment is working in a high altitude (low air pressure) or low altitude (high air pressure) area, or when it is pressed by external force, there will be a large air pressure difference between the front and rear cavities of the speaker in the electronic equipment, which will affect the dynamic balance of the amplitude of the vibration system in the speaker, making the speaker very easy to produce noise. Summary of the invention

[0004] The main purpose of the present invention is to provide a sound-generating device and an electronic device, aiming to provide a sound-generating device that avoids causing noise. The sound-generating device is applied to the electronic device, which not only realizes the timely balance between the rear cavity of the whole machine and the atmospheric pressure, but also ensures the waterproof effect of the whole machine, effectively avoiding the generation of noise.

[0005] To achieve the above object, the present invention provides a sound-generating device, which is applied to an electronic device, wherein the electronic device has a whole rear cavity, and the sound-generating device comprises:

[0006] A housing, wherein the housing is provided with a mounting cavity and a sound outlet hole, and the housing is also provided with an air leakage channel, one end of which is used to communicate with the rear cavity of the whole machine;

[0007] A sound-generating unit, wherein the sound-generating unit is disposed in the installation cavity and divides the installation cavity into a front sound cavity and a rear sound cavity, wherein the front sound cavity is connected to the sound outlet hole, and the other end of the air leakage channel is connected to the front sound cavity; and

[0008] A waterproof and breathable membrane, wherein the waterproof and breathable membrane covers the air leakage channel;

[0009] Among them, along the vibration direction of the sound-emitting unit, the projection of at least part of the air leakage channel is located outside the projection of the front sound cavity.

[0010] In one embodiment, the housing is provided with an air leakage pipe, an air permeable through hole and a connecting hole, the air leakage pipe is located in the rear sound cavity, an air leakage cavity is formed in the air leakage pipe, one end of the air leakage cavity is connected with the front sound cavity through the connecting hole, the other end of the air leakage cavity is connected with the air permeable through hole, and is used to communicate with the rear cavity of the whole machine through the air permeable through hole;

[0011] Wherein, the communicating hole, the air leakage cavity and the air permeable through hole are connected in sequence to form the air leakage channel.

[0012] In one embodiment, the housing comprises:

[0013] A first shell, wherein the first shell is provided with a containing groove and the sound outlet hole, a support platform and the air leakage pipe are convexly provided on the bottom wall of the containing groove, the support platform is enclosed to form a mounting groove connected to the sound outlet hole, the sound-emitting unit is arranged in the mounting groove, and is enclosed with the support platform to form the front sound cavity, the communication hole passes through the support platform, and is connected with the air leakage cavity and the front sound cavity; and

[0014] The second shell covers the notch of the accommodating groove and is combined with the first shell to form the installation cavity. The second shell, the first shell and the sound-emitting unit are combined to form the rear sound cavity. The second shell is provided with the air-permeable through hole corresponding to the exhaust pipe.

[0015] In one embodiment, the waterproof breathable membrane is sandwiched between the vent pipe and the second shell and covers the breathable through hole; or, a concave groove is provided on a side of the second shell facing away from the vent pipe, the breathable through hole passes through the bottom wall of the concave groove, and the waterproof breathable membrane is provided in the concave groove and covers the breathable through hole;

[0016] And / or, the communicating hole is a square through hole, the height of the communicating hole ranges from 0.2 mm to 0.4 mm, and the width of the communicating hole ranges from 4 mm to 16 mm.

[0017] In one embodiment, the first housing is further provided with an air leakage hole connected to the rear sound cavity, the sound-generating device further comprises a damping member, the damping member covers the air leakage hole, and the air leakage hole is used to communicate with the rear cavity of the whole device;

[0018] And / or, the support platform is provided with a step structure arranged around the mounting groove, and the sound unit is supported on the step structure;

[0019] And / or, the sound-generating device further comprises a sealing gasket, wherein the sealing gasket is sandwiched between the sound-generating unit and the supporting platform;

[0020] And / or, the sound-generating device further comprises a flexible circuit board, a portion of which extends into the installation cavity and is electrically connected to the sound-generating unit;

[0021] And / or, the first shell is provided with a step surface adjacent to the notch of the accommodating groove, and the second shell covers the notch of the accommodating groove and abuts against the step surface in a limiting manner;

[0022] And / or, the second shell is further provided with a filling hole communicating with the rear sound cavity, and the sound-generating device further comprises a blocking member, and the blocking member blocks the filling hole;

[0023] And / or, the first shell and / or the second shell is a metal part.

[0024] In one embodiment, the sound outlet hole passes through the bottom wall of the mounting groove and is arranged directly opposite to the sound-emitting unit;

[0025] Alternatively, the sound outlet hole passes through the side wall of the accommodating groove and is located on the side of the sound-emitting unit. The first shell is also provided with a sound guide plate, which is arranged around the sound outlet hole to form a sound guide channel connected to the front sound cavity. The two ends of the support platform are connected to the side walls of the sound guide plate and enclosed to form the installation groove connected to the sound guide channel. The sound-emitting unit is arranged in the installation groove and abuts against the sound guide plate to enclose the front sound cavity.

[0026] In one embodiment, the waterproof breathable membrane covers the communicating hole;

[0027] Or, the waterproof breathable membrane covers the air leakage cavity;

[0028] Alternatively, the waterproof breathable membrane covers the breathable through hole.

[0029] In one embodiment, the air leakage channel is arranged in the inner wall of the shell.

[0030] In one embodiment, the air leakage channel includes a plurality of;

[0031] The waterproof breathable membrane covers a plurality of the air leakage channels; or, the waterproof breathable membrane includes a plurality of membranes, each of which covers at least one air leakage channel.

[0032] In one embodiment, the effective air permeability area of ​​the waterproof breathable membrane is 5 mm 2 ~30mm 2 ;

[0033] And / or, the waterproof breathable membrane is bonded to the housing by adhesive and covers the air leakage channel, and the bonding width of the waterproof breathable membrane is 0.6 mm to 1 mm;

[0034] And / or, the waterproof breathable membrane comprises at least one non-woven fabric layer and at least one breathable membrane layer, and the breathable membrane layer is compositely connected to the non-woven fabric layer.

[0035] The present invention further provides an electronic device, comprising:

[0036] A device housing, wherein the device housing is provided with a cavity and a sound outlet hole communicating with the cavity; and

[0037] The sound-generating device described above is arranged in the cavity and enclosed with the device shell to form a rear cavity of the whole machine. The sound outlet hole of the sound-generating device is connected to the sound outlet hole, and the air leakage channel of the sound-generating device is connected to the rear cavity of the whole machine.

[0038] The sound-emitting device of the technical solution of the present invention is provided with an installation cavity and a sound outlet hole in a shell, so as to use the installation cavity to install, fix and protect the sound-emitting unit. In this way, the sound-emitting unit is installed in the installation cavity of the shell, so that the sound-emitting unit divides the installation cavity of the shell into a front sound cavity and a rear sound cavity. By connecting the front sound cavity to the sound outlet hole, the sound generated when the sound-emitting unit is working is transmitted to the outside through the front sound cavity and the sound outlet hole, thereby realizing sound. At the same time, by providing an air leakage channel in the shell, one end of the air leakage channel is connected to the front sound cavity. When the sound-emitting device is installed and applied to an electronic device, the other end of the air leakage channel is connected to the entire rear cavity of the electronic device, so that the sound emitted by the sound-emitting unit is transmitted to the outside through the front sound cavity and the sound outlet hole. In the vibration direction of the monomer, the projection of at least part of the air leakage channel is located outside the projection of the front sound cavity, so the air leakage channel can be used to timely balance the air pressure of the rear cavity of the whole machine with the atmospheric pressure, and by providing a waterproof and breathable membrane, the waterproof and breathable membrane covers the air leakage channel, thereby ensuring the waterproof effect of the whole machine. In this way, when the electronic device is working in a high altitude (low air pressure) or low altitude (high air pressure) area, or when pressed by external force, the rear sound cavity of the sound-emitting device in the electronic device is timely balanced with the atmospheric pressure through the rear cavity of the whole machine via the air leakage channel, so that the air pressure of the front sound cavity and the rear sound cavity of the sound-emitting device remain balanced, which can effectively avoid the sound-emitting device from generating noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the embodiments of the present invention 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 present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0040] Figure 1 An exploded schematic diagram of an embodiment of a sound-generating device provided by the present invention;

[0041] Figure 2A cross-sectional schematic diagram of an embodiment of a sound-generating device provided by the present invention;

[0042] Figure 3 A cross-sectional schematic diagram of another viewing angle of an embodiment of a sound-generating device provided by the present invention;

[0043] Figure 4 A schematic structural diagram of an embodiment of a first housing provided by the present invention;

[0044] Figure 5 A cross-sectional schematic diagram of an embodiment of a first housing provided by the present invention;

[0045] Figure 6 for Figure 2 A cross-sectional schematic diagram of a sound-generating device provided and placed in an electronic device;

[0046] Figure 7 A comparison chart of the noise curves of the sound-generating device provided by the present invention and the sound-generating device of the prior art when the rear cavity of the whole machine is pressed.

[0047] Description of Figure Numbers:

[0048] 100. Sound-generating device; 1. Shell; 11. Installation cavity; 12. First shell; 121. Accommodating groove; 122. Support platform; 1221. Installation groove; 1222. Step structure; 123. Sound outlet hole; 124. Air leakage channel; 125. Air leakage pipe; 1251. Air leakage cavity; 126. Connecting hole; 127. Air leakage hole; 128. Step surface; 13. Second shell; 131. Breathing hole; 132. Concave groove; 2. Sound-generating unit; 3. Front sound cavity; 4. Rear sound cavity; 5. Waterproof breathable membrane; 6. Damping member; 7. Sealing pad; 200. Electronic device; 201. Equipment shell; 202. Rear cavity of the whole machine.

[0049] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0050] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0051] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0052] At the same time, the meaning of "and / or" or "and / or" appearing in the full text includes three options. Taking "A and / or B" as an example, it includes option A, or option B, or a option in which both A and B are satisfied.

[0053] In addition, in the present invention, descriptions such as "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" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0054] In recent years, convenient electronic devices (such as mobile phones, headphones, and computers) have become part of people's daily lives. With the rapid development of technology, people's demand for the sound quality of electronic devices has become higher and higher, and full-range and miniaturized speakers have become mainstream demands.

[0055] At present, electronic devices are designed to be thinner and lighter, which makes the gap space of the whole back cavity of electronic devices smaller and smaller, the assembly between various components is more compact, and the sealing of the whole back cavity is better and better. During the operation of the speaker of the electronic device, the dynamic balance of the amplitude of the vibration system (diaphragm, dome, voice coil, support plate, etc.) is achieved through the vent hole. Since the back cavity of the whole machine is completely sealed and waterproof, the vent hole of the speaker can only communicate with the back cavity of the whole machine, and cannot communicate with the outside atmosphere, so that the back cavity of the whole machine cannot be vented. When the electronic device is working in a high altitude (low air pressure) or low altitude (high air pressure) area, or when the whole machine screen or battery shell is pressed and deformed by external force, the air pressure in the back cavity of the whole machine will increase, and enter the back cavity of the speaker through the vent hole of the speaker, so that there will be a large air pressure difference between the front and back cavities of the speaker, thereby affecting the dynamic balance of the amplitude of the vibration system, and also affecting the normal vibration of the vibration system, causing the speaker to easily produce noise.

[0056] In the related art, in the scheme of connecting the entire rear cavity of the electronic device with the outside atmosphere, the structural design requirements of the shell or the sound unit are relatively high, and the performance of the sound unit is greatly affected, especially the distortion.

[0057] As attached Figure 7 As shown in the figure, the noise curve of the prior art is the noise curve of the entire rear cavity of the speaker under pressure. It should be noted that Figure 1The speaker of the prior art is used in electronic devices. The rear cavity of the whole machine is completely sealed, and the pressure change value under external force is not taken into account. Through experimental tests, the pressure value under normal manual pressure can reach 500Pa~1500Pa, while for general mobile phones and pad-type micro speakers in the range of 500Pa~1000Pa, obvious noise will be generated (such as Figure 7 The dashed curve in Figure 5 is shown in Figure 5).

[0058] Based on the above concepts and problems, the present invention proposes a sound device 100. It can be understood that the sound device 100 can be applied to an electronic device 200, and the electronic device 200 can be a smart watch, a mobile phone, a tablet, a computer, a headset, etc., which is not limited here.

[0059] It can be understood that the electronic device 200 has a device housing 201, and the device housing 201 has a cavity. After the sound-emitting device 100 is installed in the cavity of the device housing 201, it forms a complete rear cavity 202 with the device housing 201. At this time, the sound outlet 123 of the sound-emitting device 100 is correspondingly connected to the sound outlet hole (not marked in the figure) of the device housing 201, so that the complete rear cavity 202 of the electronic device 200 is in a sealed state.

[0060] The sound-emitting device 100 in this embodiment is provided with an air leakage channel 124 in the shell 1, and the air leakage channel 124 is used to connect the rear cavity 202 of the whole machine with the front sound cavity 3 of the sound-emitting device 100, so that the rear cavity 202 of the whole machine is connected with the outside atmosphere through the sound outlet hole 123. When the rear cavity 202 of the whole machine is vented, the air leakage channel 124 is covered with a waterproof breathable membrane 5 to ensure the waterproof performance of the electronic device 200. In this way, the air pressure in the rear cavity 202 of the whole machine is stabilized and balanced, thereby avoiding the sound-emitting device 100 from generating noise, and at the same time, does not affect the performance of the sound-emitting unit 2.

[0061] Please refer to Figures 1 to 6 As shown, in an embodiment of the present invention, the sound-emitting device 100 includes a shell 1, a sound-emitting unit 2 and a waterproof breathable membrane 5. The shell 1 is provided with an installation cavity 11 and a sound outlet hole 123. The shell 1 is also provided with an air leakage channel 124. One end of the air leakage channel 124 is used to communicate with the rear cavity 202 of the whole machine. The sound-emitting unit 2 is arranged in the installation cavity 11, and the installation cavity 11 is divided into a front sound cavity 3 and a rear sound cavity 4. The front sound cavity 3 is connected to the sound outlet hole 123. The other end of the air leakage channel 124 is connected to the front sound cavity 3. The waterproof breathable membrane 5 covers the air leakage channel 124. Wherein, along the vibration direction of the sound-emitting unit 2, at least part of the projection of the air leakage channel 124 is located outside the projection of the front sound cavity 3.

[0062] In this embodiment, the housing 1 of the sound-generating device 100 is used to install, fix and support components such as the sound-generating unit 2 and the waterproof breathable membrane 5, that is, the housing 1 provides an installation base for components such as the sound-generating unit 2 and the waterproof breathable membrane 5. It can be understood that in order to facilitate the installation and protection of components such as the sound-generating unit 2 and the waterproof breathable membrane 5, the housing 1 has an installation cavity 11 or an installation space. Optionally, the structure of the housing 1 can be a structure such as an installation shell, a box body or a box body with an installation cavity 11.

[0063] It can be understood that in order to facilitate the sound generated by the sound-emitting unit 2 to be smoothly transmitted from the installation cavity 11, the housing 1 is provided with a sound outlet hole 123 connected to the installation cavity 11. Figures 1 to 3 As shown, the housing 1 includes a first housing 12 and a second housing 13, that is, the housing 1 is divided into two parts, and the first housing 12 and the second housing 13 are connected to form an integral structure. Of course, in other embodiments, the housing 1 can also be formed by an integral molding method, which is not limited here.

[0064] Optionally, the first shell 12 and / or the second shell 13 are metal parts. In this embodiment, the first shell 12 and the second shell 13 of the shell 1 are both metal parts. The first shell 12 and the second shell 13 are sealed to define the installation cavity 11, that is, the first shell 12 and the second shell 13 are made of metal material, so that the overall structure of the shell 1 is made of metal material.

[0065] It is understandable that the first shell 12 and the second shell 13 of the shell 1 can be made of thinner steel sheets, so that the shell 1 can be designed to be thinner, thereby greatly increasing the volume of the cavity in the shell 1, effectively increasing the volume of the front sound cavity 3 and the rear sound cavity 4 surrounded by the sound-emitting monomer 2 and the shell 1, and thus improving the acoustic performance of the sound-emitting device 100, especially the low-frequency acoustic performance. At the same time, the sound-emitting monomer 2 is fixed in the metal shell 1, so that heat dissipation can be achieved through the shell 1 made of metal material, thereby improving the heat dissipation performance of the sound-emitting device 100.

[0066] Optionally, the sound outlet hole 123 may be disposed at the bottom of the housing 1, that is, the sound outlet hole 123 is disposed through the first housing 12 and communicates with the installation cavity 11, thereby making the sound-emitting device 100 form a positive sound-emitting structure. Figure 1 and Figure 4 As shown, in this embodiment, the sound outlet hole 123 can be arranged on the side of the shell 1, that is, the sound outlet hole 123 passes through the side wall of the first shell 12, thereby making the sound-emitting device 100 form a side sound-emitting structure.

[0067] In this embodiment, the sound-emitting unit 2 is arranged in the installation cavity 11 of the housing 1, and cooperates with the housing 1 to form the front sound cavity 3 and the rear sound cavity 4. The diaphragm of the sound-emitting unit 2 faces the front sound cavity 3, and the front sound cavity 3 is connected with the sound outlet 123. It can be understood that in order to further improve the acoustic performance of the sound-emitting device 100, the sound-emitting device 100 also includes a metal isolation net, which is arranged in the rear sound cavity 4 to separate the rear sound cavity 4 into a filling cavity and a spacing cavity. The filling cavity is used to fill the sound-absorbing particles, so that the filling cavity is used to fill the sound-absorbing particles. In this way, the metal isolation net can be used to effectively prevent the sound-absorbing particles in the filling cavity from entering the sound-emitting unit 2.

[0068] It can be understood that the filling cavity accommodates or fills the sound-absorbing particles to form a Dbass virtual sound cavity, so that the sound generated by the sound-emitting unit 2 enters the filling cavity through the metal isolation mesh, thereby increasing the transmission path of the sound-absorbing particles, which is used to reduce the resonant frequency of the sound-emitting device 100 and improve the audio performance of the sound-emitting device 100, especially the low-frequency acoustic performance. In this embodiment, the metal isolation mesh has a breathable function. The metal isolation mesh is made of metal material. Optionally, the metal isolation mesh is formed by weaving metal wires so that the metal isolation mesh has multiple air holes.

[0069] In this embodiment, the sound-generating unit 2 may be a sound-generating unit of a loudspeaker, and the loudspeaker may be a micro-loudspeaker. The sound-generating unit 2 includes a magnetic circuit system and a vibration system. The magnetic circuit system includes a magnetic yoke and a central magnetic portion and a side magnetic portion arranged on the magnetic yoke. The side magnetic portion is located outside the central magnetic portion and is spaced from the central magnetic portion to form a magnetic gap. The vibration system includes a diaphragm and a voice coil connected to the diaphragm. The voice coil and the magnetic gap are arranged relative to each other. When current is passed into the voice coil, the voice coil vibrates in the magnetic field generated by the magnetic circuit system, thereby driving the diaphragm to make a sound. It should be noted that the specific structure of the sound-generating unit 2 refers to the prior art and is not limited here.

[0070] In order to ensure the air pressure balance between the rear acoustic cavity 4 and the front acoustic cavity 3, in one embodiment, the housing 1 is provided with an air leakage hole 127 connected to the rear acoustic cavity 4, and the sound-generating device 100 further includes a damping member 6, and the damping member 6 is covered on the air leakage hole 127. It can be understood that by providing the air leakage hole 127 and arranging the damping member 6 at the air leakage hole 127, the air leakage hole 127 is utilized to realize the air leakage or ventilation effect on the rear acoustic cavity 4.

[0071] It should be noted that the vent hole 127 is provided to balance the air pressure in the rear cavity caused by the vibration displacement of the diaphragm of the sound-emitting unit 2. Since the cavity of the sound-emitting device 100 is small and the vibration displacement of the diaphragm is relatively small, the size of the vent hole 127 is small. However, the size of the electronic device 200 is large, which makes the size of the rear cavity 202 of the whole machine large. If the pressure of the rear cavity 202 of the whole machine increases instantaneously, resulting in a large pressure, the vent channel 124 needs to be equalized, that is, the cross-sectional opening area of ​​the vent channel 124 is large.

[0072] Optionally, the air leakage hole 127 is a circular hole. In this embodiment, the diameter of the air leakage hole 127 ranges from 0.3 mm to 1.0 mm. Optionally, the diameter of the air leakage hole 127 is 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, or 0.8 mm.

[0073] It can be understood that the sound device 100 is applied to the electronic device 200, and the rear sound cavity 4 of the sound device 100 is connected to the whole device rear cavity 202 through the vent hole 127. Optionally, the damping member 6 can be a breathable membrane or a waterproof breathable membrane, etc., which can achieve a breathable and waterproof effect.

[0074] In this embodiment, an air leakage channel 124 is provided in the shell 1 so that one end of the air leakage channel 124 is connected to the front sound cavity 3. When the sound-emitting device 100 is applied to the electronic device 200, the other end of the air leakage channel 124 is connected to the rear cavity 202 of the whole machine, and a waterproof breathable membrane 5 is provided to cover the air leakage channel 124. In this way, the air leakage channel 124 can be used to realize that the rear cavity 202 of the whole machine is connected to the outside atmosphere through the air leakage channel 124, the front sound cavity 3 and the sound outlet 123, and the waterproof breathable membrane 5 can be used to prevent external water vapor or debris from entering the rear cavity 202 of the whole machine, so that the air pressure of the front sound cavity 3 and the rear sound cavity 4 of the sound-emitting device 100 is kept balanced, which can effectively prevent the sound-emitting device 100 from generating noise.

[0075] The sound-emitting device 100 of the present invention is provided with an installation cavity 11 and a sound outlet hole 123 in the shell 1, so as to utilize the installation cavity 11 to install, fix and protect the sound-emitting unit 2. In this way, the sound-emitting unit 2 is installed in the installation cavity 11 of the shell 1, so that the sound-emitting unit 2 divides the installation cavity 11 of the shell 1 into a front sound cavity 3 and a rear sound cavity 4. By connecting the front sound cavity 3 to the sound outlet hole 123, the sound generated when the sound-emitting unit 2 is working is transmitted to the outside through the front sound cavity 3 and the sound outlet hole 123, thereby realizing sound. At the same time, by providing an air leakage channel 124 in the shell 1, so that one end of the air leakage channel 124 is connected to the front sound cavity 3, when the sound-emitting device 100 is installed and applied to the electronic device 200, the other end of the air leakage channel 124 is connected to the entire rear cavity 202 of the electronic device 200, so that the sound generated along the sound-emitting unit 2 is transmitted to the outside through the front sound cavity 3 and the sound outlet hole 123. In the vibration direction of the body 2, the projection of at least part of the air leakage channel 124 is located outside the projection of the front sound cavity 3, so that the air leakage channel 124 can be used to timely balance the air pressure of the rear cavity 202 of the whole machine with the atmospheric pressure, and by arranging the waterproof breathable membrane 5, the waterproof breathable membrane 5 covers the air leakage channel 124, thereby ensuring the waterproof effect of the whole machine. In this way, when the electronic device 200 is working in a high altitude (low air pressure) or low altitude (high air pressure) area, or when pressed by external force, the rear sound cavity 4 of the sound-emitting device 100 in the electronic device 200 is timely balanced with the atmospheric pressure through the rear cavity 202 of the whole machine via the air leakage channel 124, the front sound cavity 3 and the sound outlet 123, so that the air pressure of the front sound cavity 3 and the rear sound cavity 4 of the sound-emitting device 100 is kept balanced, which can effectively avoid the sound-emitting device 100 from generating noise (such as Figure 7 shown).

[0076] In one embodiment, the shell 1 is provided with an air leakage pipe 125, an air permeable through hole 131 and a connecting hole 126. The air leakage pipe 125 is located in the rear sound cavity 4. An air leakage cavity 1251 is formed in the air leakage pipe 125. One end of the air leakage cavity 1251 is connected with the front sound cavity 3 through the connecting hole 126, and the other end of the air leakage cavity 1251 is connected with the air permeable through hole 131, and is used to communicate with the rear cavity 202 of the whole machine through the air permeable through hole 131; wherein the connecting hole 126, the air leakage cavity 1251 and the air permeable through hole 131 are connected in sequence to form an air leakage channel 124.

[0077] In this embodiment, if Figures 1 to 5 As shown, by arranging an air leakage pipe 125 in the installation cavity 11 of the shell 1, the air leakage pipe 125 is located in the rear sound cavity 4, that is, the air leakage pipe 125 is spaced from the sound-emitting unit 2, and by arranging a connecting hole 126, one end of the air leakage cavity 1251 of the air leakage pipe 125 is connected with the front sound cavity 3 through the connecting hole 126, and a breathable through hole 131 is arranged on the shell 1 corresponding to the air leakage pipe 125, so that the other end of the air leakage cavity 1251 is connected with the breathable through hole 131, and is connected with the rear cavity 202 of the whole machine through the breathable through hole 131, so that the connecting hole 126, the air leakage cavity 1251 and the breathable through hole 131 are connected in sequence to form an air leakage channel 124.

[0078] It can be understood that the air leakage channel 124 is completely disposed in the rear acoustic cavity 4 of the shell 1. Of course, in other embodiments, the air leakage channel 124 can also be disposed in the inner wall of the shell 1, that is, the air leakage channel 124 is integrally formed in the inner wall of the shell 1 to form a hollow channel structure. Optionally, the material of the shell 1 can be a plastic material, so that during the injection molding process of the shell 1, the air leakage channel 124 is formed in the inner wall of the shell 1. Alternatively, the air leakage channel 124 can also be formed by injecting a metal tube into the inner wall of the shell 1, which is not limited here.

[0079] In order to ensure the air permeability of the air leakage channel 124, the number of air leakage channels 124 can be set to be multiple; or, the cross-sectional area of ​​the air leakage channel 124 can be set to be larger, which is not limited here. In this embodiment, the air leakage channel 124 can optionally include multiple air leakage channels 124. The waterproof breathable membrane 5 covers multiple air leakage channels 124 at the same time; or, the waterproof breathable membrane 5 includes multiple, and each waterproof breathable membrane 5 covers at least one air leakage channel 124, which is not limited here.

[0080] It is understandable that the multiple air leakage channels 124 are arranged at intervals. For example, the multiple air leakage channels 124 are arranged at intervals in the inner wall of the shell 1; or, multiple air leakage pipes 125 are arranged in the rear sound cavity 4 of the shell 1, so that multiple air leakage cavities 1251 cooperate with the air permeable through holes 131 and the connecting holes 126 to form multiple air leakage channels 124; or, multiple spaced air leakage cavities 1251 are formed in one air leakage pipe 125, which is not limited here.

[0081] Optionally, the waterproof breathable membrane 5 may be disposed at the communicating hole 126, and the waterproof breathable membrane 5 covers the communicating hole 126. Alternatively, the waterproof breathable membrane 5 is disposed at both ends of the venting pipe 125 or in the venting pipe 125, so that the waterproof breathable membrane 5 covers the venting cavity 1251, for example, the waterproof breathable membrane 5 is sandwiched between the venting pipe 125 and the second shell 13, and covers the breathable through hole 131; or, the waterproof breathable membrane 5 is disposed at the breathable through hole 131, and the waterproof breathable membrane 5 covers the breathable through hole 131, which is not limited here.

[0082] In order to ensure the air permeability of the air leakage channel 124, in this embodiment, the area of ​​the air permeable hole 131 can be selected to be 5mm 2 ~30mm 2 Optionally, the area of ​​the ventilation hole 131 is 5 mm 2 , 10mm 2 , 15mm 2 , 20mm 2 , 25mm 2 , 30mm 2 Etc., no limitation is made here.

[0083] Of course, in order to further ensure the air permeability of the air leakage channel 124, in this embodiment, the communication hole 126 is a square through hole, the height range of the communication hole 126 is 0.2mm-0.4mm, and the width range of the communication hole 126 is 4mm-16mm. Optionally, the height of the communication hole 126 is 0.2mm, 0.3mm, 0.4mm, etc., which is not limited here. Optionally, the width of the communication hole 126 is 4mm, 5mm, 8mm, 10mm, 13mm, 15mm, 16mm, etc., which is not limited here.

[0084] It is understandable that if the connecting hole 126 is too small, airflow will be blocked, and if the connecting hole 126 is too high or too wide, the structural strength of the shell 1 will be affected, thereby reducing reliability and increasing the difficulty of gluing.

[0085] In one embodiment, if Figures 1 to 3 As shown, a concave groove 132 is provided on the side of the second shell 13 facing away from the vent pipe 125 , a vent hole 131 passes through the bottom wall of the concave groove 132 , and the waterproof breathable membrane 5 is provided in the concave groove 132 and covers the vent hole 131 .

[0086] It can be understood that when the sound-emitting device 100 is applied to the electronic device 200, the second shell 13 of the sound-emitting device 100 is usually close to the battery cover and has a relatively flat structure. In this way, the air-permeable hole 131 and the waterproof breathable membrane 5 are arranged in the second shell 13, so that the position of the waterproof breathable membrane 5 is easier to design, and at the same time, the pressure relief effect on the rear cavity 202 of the whole machine is the best, and it does not affect the structural design of the first shell 12, and at the same time, it can ensure that the rear cavity 202 of the whole machine is still connected to the external airflow.

[0087] In one embodiment, the effective air permeability area of ​​the waterproof breathable membrane 5 is 5 mm 2 ~30mm 2 Optionally, the effective air permeability area of ​​the waterproof breathable membrane 5 is 5 mm 2 , 10mm 2 , 15mm 2 , 20mm 2 , 25mm 2 , 30mm 2 It is understandable that such a configuration can ensure different waterproof level requirements of the whole machine.

[0088] In this embodiment, if Figures 1 to 3 As shown, the waterproof breathable membrane 5 is bonded to the housing 1 by adhesive and covers the air leakage channel 124. The bonding width of the waterproof breathable membrane 5 is 0.6mm to 1mm. It can be understood that the waterproof breathable membrane 5 is bonded to the side of the second housing 13 of the housing 1 facing away from the first housing 12 by adhesive. When the bonding width is small or the waterproof grade is high, it needs to be sealed by adhesive coating all around.

[0089] In one embodiment, the waterproof breathable membrane 5 includes at least one non-woven fabric layer and at least one breathable membrane layer, and the breathable membrane layer is compositely connected to the non-woven fabric layer. It is understandable that the non-woven fabric layer and the breathable membrane layer of the waterproof breathable membrane 5 can be formed by hot pressing composite, specifically referring to the prior art, which is not limited here. The number of layers of the non-woven fabric layer and the number of layers of the breathable membrane layer of the waterproof breathable membrane 5 can be selectively set according to different waterproof grade requirements, which is not limited here. The material of the breathable membrane layer can be polytetrafluoroethylene. It is understandable that the waterproof breathable membrane 5 can achieve a breathable and waterproof effect.

[0090] In one embodiment, the shell 1 includes a first shell 12 and a second shell 13, wherein the first shell 12 is provided with a receiving groove 121 and a sound outlet hole 123, the bottom wall of the receiving groove 121 is protrudingly provided with a support platform 122 and an air release pipe 125, the support platform 122 encloses a mounting groove 1221 connected to the sound outlet hole 123, the sound unit 2 is arranged in the mounting groove 1221, and is enclosed with the support platform 122 to form a front sound cavity 3, the connecting hole 126 passes through the support platform 122, and is connected with the air release cavity 1251 and the front sound cavity 3, the second shell 13 covers the notch of the receiving groove 121, and is enclosed with the first shell 12 to form a mounting cavity 11, the second shell 13, the first shell 12 and the sound unit 2 are enclosed to form a rear sound cavity 4, and the second shell 13 is provided with a ventilation hole 131 corresponding to the air release pipe 125.

[0091] In this embodiment, if Figures 1 to 5 As shown, the first shell 12 and the second shell 13 of the shell 1 can be welded or bonded, so that the shell 1 forms a sealed installation cavity 11. Of course, the first shell 12 and the second shell 13 can also be connected as a whole by a detachable connection method such as a snap connection, a plug-in fit, a screw connection or a pin connection, which can improve the convenience of disassembly and assembly of the sound unit 2.

[0092] In order to further improve the connection stability and strength of the first shell 12 and the second shell 13, in this embodiment, as shown in FIG. Figure 1 , Figures 3 to 5 As shown, the first housing 12 is provided with a step surface 128 adjacent to the notch of the accommodating groove 121, and the second housing 13 covers the notch of the accommodating groove 121 and is limitedly abutted against the step surface 128. It can be understood that by providing the step surface 128 on the first housing 12, the step surface 128 is used to support and limit the second housing 13, so as to improve the connection sealing and ensure the integrity of the sound unit 2 and other components.

[0093] It can be understood that by protruding a support platform 122 on the bottom wall of the accommodating groove 121 of the first shell 12, the support platform 122 encloses a mounting groove 1221 connected to the sound outlet 123, thereby utilizing the mounting groove 1221 formed by the support platform 122 to achieve limited installation of the sound unit 2.

[0094] In one embodiment, the support platform 122 is provided with a step structure 1222 arranged around the mounting groove 1221, and the sound unit 2 is supported on the step structure 1222. It can be understood that by forming the step structure 1222 on the side of the support platform 122 facing the mounting groove 1221, the sound unit 2 is arranged in the mounting groove 1221 and supported on the step structure 1222, that is, the step structure 1222 is used to support the sound unit 2, so that the diaphragm of the sound unit 2 and the support platform 122 are enclosed to form a front sound cavity 3 connected to the sound outlet hole 123.

[0095] In order to further seal and isolate the front acoustic cavity 3 and the rear acoustic cavity 4, in one embodiment, as Figure 1 As shown, the sound-generating device 100 further includes a sealing gasket 7, which is sandwiched between the sound-generating unit 2 and the support platform 122. In this embodiment, the sealing gasket 7 is sandwiched between the diaphragm of the sound-generating unit 2 and the step structure 1222 of the support platform 122, which further improves the sealing performance and protects the diaphragm of the sound-generating unit 2.

[0096] In this embodiment, if Figures 1 to 5 As shown, the first shell 12 includes a bottom plate and a surrounding plate arranged at the periphery of the bottom plate, the surrounding plate and the bottom plate are combined to form a receiving groove 121, the sound outlet 123 is opened in the surrounding plate, and the bottom plate is convexly provided with a support platform 122. Optionally, the bottom plate and the surrounding plate of the first shell 12 can be an integrally formed structure, so that the surrounding plate and the bottom plate are combined to form the receiving groove 121.

[0097] In one embodiment, the sound outlet hole 123 passes through the bottom wall of the mounting groove 1221 and is arranged opposite to the sound-emitting unit 2. It can be understood that the sound outlet hole 123 passes through the bottom plate of the first shell 12 and is located in the support platform 122, that is, the sound outlet hole 123 is opened on the bottom wall of the mounting groove 1221, so that the diaphragm of the sound-emitting unit 2 is arranged opposite to the sound outlet hole 123, so that the sound-emitting device 100 forms a positive sound-emitting structure.

[0098] In another embodiment, the sound outlet hole 123 passes through the side wall of the accommodating groove 121 and is located on the side of the sound-emitting unit 2. The first shell 12 is also provided with a sound guide plate, which is arranged around the sound outlet hole 123 to form a sound guide channel connected to the front sound cavity 3. The two ends of the support platform 122 are connected to the side walls of the sound guide plate and enclose a mounting groove 1221 connected to the sound guide channel. The sound-emitting unit 2 is arranged in the mounting groove 1221 and abuts against the sound guide plate to enclose the front sound cavity 3.

[0099] In this embodiment, if Figure 1 and Figure 4As shown, the sound outlet hole 123 passes through the enclosure of the first shell 12, and the sound guide plate is arranged on the enclosure of the first shell 12 and is arranged around the sound outlet hole 123 to form a sound guide channel, and the two ends of the support platform 122 are connected to the outer wall and the enclosure of the sound guide plate, so that the sound guide channel is connected to the front sound cavity 3, so that the sound unit 2 is arranged in the installation groove 1221 and abuts against the sound guide plate, so that the sound outlet hole 123 is located on the side of the sound unit 2, so that the sound device 100 has a side sound structure.

[0100] In one embodiment, the first housing 12 is further provided with an air leakage hole 127 connected to the rear sound cavity 4, and the sound-generating device 100 further includes a damping member 6, which is covered on the air leakage hole 127, and the air leakage hole 127 is used to communicate with the entire rear cavity 202. It can be understood that by providing the air leakage hole 127 and arranging the damping member 6 at the air leakage hole 127, the air leakage hole 127 is used to achieve air leakage or ventilation of the filling cavity.

[0101] In this embodiment, when the sound-emitting device 100 is working, the sound emitted by the diaphragm of the sound-emitting unit 2 is transmitted to the outside through the front sound cavity 3 and the sound outlet hole 123 during the sound-emitting process of the diaphragm vibrating. When the rear sound cavity 4 is accumulated during the vibration of the diaphragm, the air flow route of the rear sound cavity 4 is: rear sound cavity 4—air leakage hole 127—rear cavity 202 of the whole machine—waterproof breathable membrane 5—breathable through hole 131—air leakage cavity 1251 of the air leakage pipe 125—connecting hole 126—front sound cavity 3—sound outlet hole 123.

[0102] It can be understood that when the electronic device 200 is operating in a high altitude (low pressure) or low altitude (high pressure) area, or is pressed by external force, the rear sound cavity 4 of the sound device 100 in the electronic device 200 is timely balanced with the atmospheric pressure through the rear cavity 202 of the whole machine via the air leakage channel 124, the front sound cavity 3 and the sound outlet 123, so that the air pressure in the front sound cavity 3 and the rear sound cavity 4 of the sound device 100 remains balanced, which can effectively prevent the sound device 100 from generating noise.

[0103] In one embodiment, the second shell 13 is further provided with a filling hole connected to the rear sound cavity 4, and the sound-generating device 100 further includes a blocking member, which blocks the filling hole. It can be understood that by providing the filling hole, it is convenient to use the filling hole to fill the sound-absorbing particles into the rear sound cavity 4 or the filling cavity. By providing the blocking member, the filling hole is blocked by the blocking member to prevent leakage of the sound-absorbing particles. Optionally, the blocking member is made of PET material.

[0104] In one embodiment, the sound-emitting device 100 further includes a flexible circuit board, a portion of which extends into the mounting cavity 11 and is electrically connected to the sound-emitting unit 2 .

[0105] In this embodiment, the flexible circuit board has an inner pad located in the mounting cavity 11, so that the flexible circuit board is electrically connected to the sound-emitting unit 2 through the inner pad. When the housing 1 is a metal housing, an insulating spacer is provided at the position of the inner pad corresponding to the inner peripheral wall of the first housing 12, thereby effectively avoiding leakage caused by the connection between the inner pad and the housing 1 through the insulating spacer. Optionally, the insulating spacer can be an insulating tape, a Mylar film, etc., which is not limited here.

[0106] It can be understood that the flexible circuit board is also provided with an external pad, which is located at one end of the flexible circuit board extending out of the mounting cavity 11, so that the flexible circuit board can be connected to an external power supply through the external pad.

[0107] The present invention also proposes an electronic device 200, which includes a device housing 201 and the above-mentioned sound-emitting device 100. The specific structure of the sound-emitting device 100 refers to the aforementioned embodiment. Since the electronic device 200 adopts all the technical solutions of all the aforementioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the aforementioned embodiments, which will not be repeated here one by one.

[0108] In this embodiment, the device housing 201 is provided with a cavity and a sound outlet hole connected to the cavity. The sound-emitting device 100 is disposed in the cavity and is enclosed with the device housing 201 to form a rear cavity 202 of the entire machine. The sound outlet hole 123 of the sound-emitting device 100 is connected to the sound outlet hole, and the air leakage channel 124 of the sound-emitting device 100 is connected to the rear cavity 202 of the entire machine.

[0109] It is understandable that the electronic device 200 can be headphones, mobile phones, computers, tablet computers, smart wearable devices, etc., which are not limited here.

[0110] The above descriptions are only optional embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A sound-generating device, applied to an electronic device, wherein the electronic device has a whole rear cavity, characterized in that: The sound-generating device comprises: A housing, wherein the housing is provided with a mounting cavity and a sound outlet hole, and the housing is also provided with an air leakage channel, one end of which is used to communicate with the rear cavity of the whole machine; A sound-generating unit, wherein the sound-generating unit is disposed in the installation cavity and divides the installation cavity into a front sound cavity and a rear sound cavity, wherein the front sound cavity is connected to the sound outlet hole, and the other end of the air leakage channel is connected to the front sound cavity; and A waterproof and breathable membrane, wherein the waterproof and breathable membrane covers the air leakage channel; Among them, along the vibration direction of the sound-emitting unit, the projection of at least part of the air leakage channel is located outside the projection of the front sound cavity.

2. The sound generating device according to claim 1, characterized in that: The housing is provided with an air leakage pipe, an air permeable through hole and a connecting hole. The air leakage pipe is located in the rear sound cavity. An air leakage cavity is formed in the air leakage pipe. One end of the air leakage cavity is connected with the front sound cavity through the connecting hole. The other end of the air leakage cavity is connected with the air permeable through hole and is used to communicate with the rear cavity of the whole machine through the air permeable through hole. Wherein, the communicating hole, the air leakage cavity and the air permeable through hole are connected in sequence to form the air leakage channel.

3. The sound-generating device according to claim 2, characterized in that: The housing comprises: A first shell, wherein the first shell is provided with a containing groove and the sound outlet hole, a support platform and the air leakage pipe are convexly provided on the bottom wall of the containing groove, the support platform is enclosed to form a mounting groove connected to the sound outlet hole, the sound-emitting unit is arranged in the mounting groove, and is enclosed with the support platform to form the front sound cavity, the communication hole passes through the support platform, and is connected with the air leakage cavity and the front sound cavity; and The second shell covers the notch of the accommodating groove and is combined with the first shell to form the installation cavity. The second shell, the first shell and the sound-emitting unit are combined to form the rear sound cavity. The second shell is provided with the air-permeable through hole corresponding to the exhaust pipe.

4. The sound-generating device according to claim 3, characterized in that: The waterproof breathable membrane is sandwiched between the vent pipe and the second shell and covers the breathable through hole; or, a concave groove is provided on the side of the second shell facing away from the vent pipe, the breathable through hole penetrates the bottom wall of the concave groove, and the waterproof breathable membrane is provided in the concave groove and covers the breathable through hole; And / or, the communicating hole is a square through hole, the height of the communicating hole ranges from 0.2 mm to 0.4 mm, and the width of the communicating hole ranges from 4 mm to 16 mm.

5. The sound generating device according to claim 3, characterized in that: The first shell is further provided with an air leakage hole connected to the rear sound cavity, and the sound-generating device further includes a damping member, the damping member is covered on the air leakage hole, and the air leakage hole is used to communicate with the rear cavity of the whole machine; And / or, the support platform is provided with a step structure arranged around the mounting groove, and the sound unit is supported on the step structure; And / or, the sound-generating device further comprises a sealing gasket, wherein the sealing gasket is sandwiched between the sound-generating unit and the supporting platform; And / or, the sound-generating device further comprises a flexible circuit board, a portion of which extends into the installation cavity and is electrically connected to the sound-generating unit; And / or, the first shell is provided with a step surface adjacent to the notch of the accommodating groove, and the second shell covers the notch of the accommodating groove and abuts against the step surface in a limiting manner; And / or, the second shell is further provided with a filling hole communicating with the rear sound cavity, and the sound-generating device further comprises a blocking member, and the blocking member blocks the filling hole; And / or, the first shell and / or the second shell is a metal part.

6. The sound generating device according to claim 3, characterized in that: The sound outlet hole passes through the bottom wall of the installation groove and is arranged directly opposite to the sound-emitting unit; Alternatively, the sound outlet hole passes through the side wall of the accommodating groove and is located on the side of the sound-emitting unit. The first shell is also provided with a sound guide plate, which is arranged around the sound outlet hole to form a sound guide channel connected to the front sound cavity. The two ends of the support platform are connected to the side walls of the sound guide plate and enclosed to form the installation groove connected to the sound guide channel. The sound-emitting unit is arranged in the installation groove and abuts against the sound guide plate to enclose the front sound cavity.

7. The sound generating device according to claim 2, characterized in that: The waterproof and breathable membrane covers the communicating hole; Or, the waterproof breathable membrane covers the air leakage cavity; Alternatively, the waterproof breathable membrane covers the breathable through hole.

8. The sound generating device according to claim 1, characterized in that: The air leakage channel is arranged in the inner wall of the shell.

9. The sound generating device according to any one of claims 1 to 8, characterized in that: The air leakage passage comprises a plurality of; The waterproof breathable membrane covers a plurality of the air leakage channels; or, the waterproof breathable membrane includes a plurality of membranes, each of which covers at least one air leakage channel.

10. The sound generating device according to any one of claims 1 to 8, characterized in that: The effective air permeability area of ​​the waterproof breathable membrane is 5mm 2 ~30mm 2 ; And / or, the waterproof breathable membrane is bonded to the housing by adhesive and covers the air leakage channel, and the bonding width of the waterproof breathable membrane is 0.6 mm to 1 mm; And / or, the waterproof breathable membrane comprises at least one non-woven fabric layer and at least one breathable membrane layer, and the breathable membrane layer is compositely connected to the non-woven fabric layer.

11. An electronic device, characterized in that: The electronic device comprises: A device housing, wherein the device housing is provided with a cavity and a sound outlet hole communicating with the cavity; and The sound-emitting device as described in any one of claims 1 to 10, wherein the sound-emitting device is arranged in the cavity and is enclosed with the device shell to form a rear cavity of the whole machine, the sound outlet hole of the sound-emitting device is connected to the sound outlet hole, and the air leakage channel of the sound-emitting device is connected to the rear cavity of the whole machine.

Images