Electroacoustic devices and electronic equipment

Abstract

The present application provides an electroacoustic device and an electronic device. The electroacoustic device includes a shell, an electroacoustic conversion component and a functional component. The electroacoustic conversion component is arranged in the shell, and a front sound cavity and a rear sound cavity are formed between the electroacoustic conversion component and the shell, and the front sound cavity and the rear sound cavity are relatively arranged on both sides of the electroacoustic conversion component. The functional component is arranged in the rear sound cavity, and the functional component is used to convert part of the sound energy in the rear sound cavity into electrical energy and output it. The electronic device includes a power amplifier and the electroacoustic device. The power amplifier is electrically connected to the electroacoustic conversion component, and the power amplifier is used to output a first electrical signal to the electroacoustic conversion component so that the electroacoustic conversion component undergoes electroacoustic conversion. The electroacoustic device and electronic device provided by the present application can take into account both miniaturization and improved transmission efficiency of low-frequency sounds.

Description

Technical Field

[0001] The present application relates to the field of electronic technology, and in particular to an electroacoustic device and an electronic device. Background Art

[0002] As electronic devices become thinner and lighter, the space left for electroacoustic devices is gradually reduced. If the rear sound cavity of the electroacoustic device is too small, it will affect the transmission efficiency of low-frequency sound. Therefore, how to balance the miniaturization of the electroacoustic device and the improvement of the transmission efficiency of low-frequency sound has become a technical problem that needs to be solved. Summary of the invention

[0003] The present application provides an electroacoustic device and an electronic device that can achieve both miniaturization and improved transmission efficiency of low-frequency sounds.

[0004] In one aspect, the present application provides an electroacoustic device, comprising:

[0005] case;

[0006] an electroacoustic conversion component, disposed in the shell, wherein a front sound cavity and a rear sound cavity are formed between the electroacoustic conversion component and the shell, and the front sound cavity and the rear sound cavity are disposed on two sides of the electroacoustic conversion component opposite to each other; and

[0007] A functional component is arranged in the rear sound cavity, and is used to convert part of the sound energy in the rear sound cavity into electrical energy and output it.

[0008] On the other hand, the present application also provides an electronic device, including a power amplifier and the electroacoustic device, wherein the power amplifier is electrically connected to the electroacoustic conversion component, and the power amplifier is used to output a first electrical signal to the electroacoustic conversion component so that the electroacoustic conversion component performs electroacoustic conversion.

[0009] The electroacoustic device provided in the present application includes a shell, an electroacoustic conversion component and a functional component. The electroacoustic conversion component is arranged in the shell. A front sound cavity and a rear sound cavity are formed between the electroacoustic conversion component and the shell. The front sound cavity and the rear sound cavity are relatively arranged on both sides of the electroacoustic conversion component. The functional component is arranged in the rear sound cavity. The functional component is used to convert part of the sound energy in the rear sound cavity into electrical energy and output it. Therefore, the functional component can consume part of the energy of the sound waves in the rear sound cavity, thereby reducing the reflection of the sound waves in the rear sound cavity, which is equivalent to increasing the volume of the rear sound cavity. Further, the transmission performance of the low-frequency sound can be improved without increasing the volume of the electroacoustic device, that is, it can take into account both the miniaturization of the electroacoustic device and the improvement of the transmission efficiency of the low-frequency sound. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments are briefly introduced below.

[0011] Figure 1 A schematic diagram of a planar structure of an electroacoustic device provided in an embodiment of the present application;

[0012] Figure 2 A schematic diagram of a planar structure of a sound-absorbing material in the related art;

[0013] Figure 3 for Figure 1 The functional components of the electroacoustic device shown include a schematic diagram of a structure of a first functional component and a second functional component;

[0014] Figure 4 for Figure 3 A partial enlarged schematic diagram of functional components in the electroacoustic device shown;

[0015] Figure 5 for Figure 3 A schematic diagram showing a comparison of frequency response curves of an electroacoustic device with and without functional components;

[0016] Figure 6 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application;

[0017] Figure 7 for Figure 6 A schematic diagram of an electrical signal transmission path in the electronic device shown;

[0018] Figure 8 for Figure 7 A schematic diagram of a second electrical signal output by a first conversion circuit in the electronic device shown;

[0019] Fig. 9 for Figure 6 Another schematic diagram of the transmission path of electrical signals in the electronic device shown;

[0020] Fig.10 for Figure 6 Another schematic diagram of the electrical signal transmission path in the electronic device is shown.

[0021] Description of reference numerals:

[0022] Electroacoustic device 100; housing 10; electroacoustic conversion component 20; functional component 30; diaphragm 201; magnet 202; front sound cavity 101; rear sound cavity 102; sound absorbing material 11; first functional part 301; second functional part 302; pore 303; electronic device 1000; power amplifier 200; audio signal source 300; first conversion circuit 400; battery 500; second conversion circuit 600. DETAILED DESCRIPTION

[0023] The technical solution provided by the present application will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the embodiments described in the present application are only a part of the embodiments, not all of the embodiments. Based on the embodiments described in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0024] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it mutually exclusive, independent, or alternative to other embodiments. It can be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0025] The terms "first", "second", etc. in the specification and claims of this application are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example: a component or device including one or more parts is not limited to the one or more parts listed, but may optionally include one or more parts that are not listed but inherent to the exemplified product, or one or more parts that it should have based on the described function.

[0026] like Figure 1 As shown, Figure 1 A schematic diagram of a planar structure of an electroacoustic device 100 provided in an embodiment of the present application. The electroacoustic device 100 includes but is not limited to a speaker or a microphone. The feature description of the electroacoustic device 100 in the following embodiment mainly takes a speaker as an example. The electroacoustic device 100 includes a housing 10, an electroacoustic conversion component 20 and a functional component 30.

[0027] The housing 10 is used to accommodate the electroacoustic conversion component 20 and the functional component 30. The present application does not make any specific limitation on the shape of the housing 10. For example, the shape of the housing 10 can be rectangular, square, circular, or irregular, etc. The present application does not make any specific limitation on the material of the housing 10. For example, the material of the housing 10 can be plastic, ceramic, glass, metal, etc.

[0028] One or more sound holes are provided on the housing 10. The present application does not specifically limit the number, size, shape, arrangement, etc. of the sound holes. In the embodiment where a plurality of sound holes are provided on the housing 10, the sizes of the plurality of sound holes may be the same or different; the shapes of the plurality of sound holes may be the same or different; the plurality of sound holes may be evenly distributed or scattered.

[0029] In the embodiment of the present application, the electroacoustic conversion component 20 is used to convert an electrical signal into an acoustic signal. Of course, in other possible embodiments, the electroacoustic conversion component 20 can also be used to convert an acoustic signal into an electrical signal. It can be understood that the electroacoustic conversion component 20 is used to achieve electrical-acoustic conversion, or to achieve acoustic-electrical conversion.

[0030] The electroacoustic conversion component 20 is disposed in the housing 10. In the embodiment of the present application, the electroacoustic conversion component 20 is disposed in the housing 10, and at least part of the electroacoustic conversion component 20 may be fixed in the housing 10. Optionally, at least part of the electroacoustic conversion component 20 may be directly fixed on the inner surface of the housing 10, or at least part of the electroacoustic conversion component 20 may be fixed on the inner surface of the housing 10 by a bracket or the like.

[0031] In a possible embodiment, the electro-acoustic conversion component 20 may include a diaphragm 201, a coil and a magnet 202. The diaphragm 201, the coil and the magnet 202 are all located in the housing 10, and the diaphragm 201 is arranged on the coil, and the magnet 202 is relatively fixed to the housing 10. In this embodiment, the electro-acoustic conversion component 20 realizes the principle of electro-acoustic conversion as follows: when a current carrying a sound signal passes through the coil, based on the principle that a current-carrying wire is subjected to force in a magnetic field, the coil will be subjected to force in the magnetic field of the magnet 202 and vibrate. When the coil vibrates, it will drive the diaphragm 201 to vibrate, thereby converting the electrical signal into a sound signal.

[0032] Among them, for the diaphragm 201, when divided by the shape of the diaphragm 201, the diaphragm 201 includes but is not limited to a cone diaphragm, or a flat diaphragm, or a dome diaphragm, or a horn diaphragm, or a ribbon diaphragm, etc.; when divided by the material of the diaphragm 201, the diaphragm 201 includes but is not limited to a paper diaphragm, or a plastic diaphragm, or a metal diaphragm, or a graphene diaphragm, or a composite material diaphragm, or a biomaterial diaphragm, etc. For the coil, when divided by the shape of the coil, the coil includes but is not limited to a circular coil, or a square coil, or a rectangular coil, or an elliptical coil, or an L-shaped coil, or a U-shaped coil, or other regular or irregular shaped coils, etc.; when divided by the wire material of the coil, the coil includes but is not limited to a metal coil, or an alloy coil, or a composite metal oxide coil, or a conductive polymer coil, etc. For the magnet 202, when classified according to the magnetic field characteristics of the magnet 202, the magnet 202 includes but is not limited to a permanent magnet, an electromagnetic magnet, or a composite magnet, etc.; when classified according to the material of the magnet 202, the magnet 202 includes but is not limited to a ferrite magnet, an aluminum nickel cobalt magnet, or a neodymium iron boron magnet, etc.

[0033] A front sound cavity 101 and a rear sound cavity 102 are formed between the electroacoustic conversion component 20 and the housing 10 . The front sound cavity 101 and the rear sound cavity 102 are disposed on two sides of the electroacoustic conversion component 20 .

[0034] It can be understood that the electroacoustic conversion component 20 divides the internal space of the shell 10 into a front sound cavity 101 and a rear sound cavity 102. Among them, the front sound cavity 101 is located in front of the diaphragm 201 in the electroacoustic conversion component 20, and the rear sound cavity 102 is located behind the diaphragm 201 in the electroacoustic conversion component 20. Specifically, when the diaphragm 201 is pushed outward, the air in the front is compressed to form a positive pressure, while the air in the rear is expanded to form a negative pressure. The front sound cavity 101 and the rear sound cavity 102 may be connected to each other, or may not be connected. The structural design of the front sound cavity 101 mainly affects the output of high-frequency sounds. Generally speaking, in order to ensure the clarity and transmission efficiency of high-frequency sounds, the structural design of the front sound cavity 101 needs to consider its volume size, as well as the balance between the volume of the front sound cavity 101 and the size and position of the sound outlet on the shell 10. The structural design of the rear sound cavity 102 mainly affects the output of low-frequency sounds. Generally speaking, within a certain range, the larger the volume of the rear sound cavity 102 is, the more obvious the output effect of the low-frequency sound is.

[0035] The present application does not make any specific limitation on the shape of the front sound cavity 101. The shape of the front sound cavity 101 may be a regular shape, or an irregular shape. For example, the shape of the front sound cavity 101 includes, but is not limited to, a square, a rectangle, a circle, an ellipse, a cone, etc. The present application does not make any specific limitation on the shape of the rear sound cavity 102. The shape of the rear sound cavity 102 may be a regular shape, or an irregular shape. For example, the shape of the rear sound cavity 102 includes, but is not limited to, a square, a rectangle, a circle, an ellipse, a cone, etc. The shape of the front sound cavity 101 may be the same as that of the rear sound cavity 102, or they may be different.

[0036] The present application does not specifically limit the size of the front sound cavity 101 and the size of the rear sound cavity 102. In a possible embodiment, the volume of the front sound cavity 101 may be smaller than the volume of the rear sound cavity 102. Of course, in other possible embodiments, the volume of the front sound cavity 101 may also be equal to or greater than the volume of the rear sound cavity 102.

[0037] The functional component 30 is disposed in the rear sound cavity 102. In the embodiment of the present application, the functional component 30 being disposed in the rear sound cavity 102 may be the functional component 30 being placed in the rear sound cavity 102 of the housing 10, that is, the functional component 30 may not be fixed to the housing 10. Of course, in other possible embodiments, part of the functional component 30 may be fixed to the housing 10, for example, both ends of the functional component 30 may be fixed to the housing 10 at points.

[0038] The functional component 30 is used to convert part of the sound energy in the rear sound cavity 102 into electrical energy and output it. The functional component 30 includes but is not limited to a piezoelectric functional component, an electromagnetic functional component, an electrostatic functional component, etc. When the functional component 30 is a piezoelectric functional component, the functional component 30 converts part of the sound energy in the rear sound cavity 102 into electrical energy based on the piezoelectric effect. When the functional component 30 is an electromagnetic functional component, the functional component 30 converts part of the sound energy in the rear sound cavity 102 into electrical energy based on the principle of electromagnetic induction. When the functional component 30 is an electrostatic functional component, the functional component 30 converts part of the sound energy in the rear sound cavity 102 into electrical energy based on the principle of capacitor.

[0039] It can be understood that the setting of the functional component 30 can reduce part of the sound waves in the rear sound cavity 102, thereby reducing the reflection of the sound waves in the rear sound cavity 102, which is equivalent to increasing the volume of the rear sound cavity 102, and can improve the output performance of low-frequency sound. The functional component 30 converts part of the sound energy in the rear sound cavity 102 into electrical energy and outputs it. The functional component 30 can convert part of the sound energy in the rear sound cavity 102 into electrical energy and directly output it in the form of electrical energy, or the functional component 30 can convert part of the sound energy in the rear sound cavity 102 into electrical energy and then convert it into other energy forms before outputting it.

[0040] The electroacoustic device 100 provided in the present application includes a shell 10, an electroacoustic conversion component 20 and a functional component 30. The electroacoustic conversion component 20 is arranged in the shell 10. A front sound cavity 101 and a rear sound cavity 102 are formed between the electroacoustic conversion component 20 and the shell 10. The front sound cavity 101 and the rear sound cavity 102 are relatively arranged on both sides of the electroacoustic conversion component 20. The functional component 30 is arranged in the rear sound cavity 102. The functional component 30 is used to convert part of the sound energy in the rear sound cavity 102 into electrical energy and output it. Therefore, the functional component 30 can consume part of the energy of the sound waves in the rear sound cavity 102, thereby reducing the reflection of the sound waves in the rear sound cavity 102, which is equivalent to increasing the volume of the rear sound cavity 102, and thus can improve the transmission performance of low-frequency sound without increasing the volume of the electroacoustic device 100, that is, it can take into account both the miniaturization of the electroacoustic device 100 and the improvement of the transmission efficiency of low-frequency sound.

[0041] like Figure 2 As shown, Figure 2The figure is a schematic diagram of a planar structure of a sound absorbing material 11 in the related art. In the related art, by setting the sound absorbing material 11 in the back cavity, the output performance of low-frequency sound can be improved. The sound absorbing material 11 is usually porous spherical particles, which have a complex preparation process and poor pressure resistance. In addition, the gaps between the particles also lead to low space utilization of the back cavity. In order to facilitate the setting of the sound absorbing material 11 in the back cavity in actual production, the sound absorbing material 11 is usually packaged and combined by non-woven fabrics, which also requires the shape of the back cavity to be a regular shape.

[0042] Based on the problems of the above-mentioned related technologies, the present application sets a functional component 30 in the rear sound cavity 102 so that the functional component 30 converts part of the sound energy in the rear sound cavity 102 into electrical energy and outputs it, so as to improve the output performance of low-frequency sound. Compared with the technical solution of setting the sound-absorbing material 11 in the related technology, the present application can simplify the preparation process, facilitate assembly, improve the space utilization of the rear sound cavity 102, and there is basically no restriction on the shape of the rear sound cavity 102.

[0043] In a possible embodiment, the functional component 30 converts part of the sound energy in the rear sound cavity 102 into electrical energy based on the friction electrification effect.

[0044] It is understandable that part of the sound energy in the rear sound cavity 102 can cause mutual friction and electrification inside the functional component 30. The mutual friction inside the functional component 30 includes but is not limited to deformation of at least part of the functional component 30 to form friction, and / or contact-type relative movement between different parts of the functional component 30 to form friction, and / or collision between different parts of the functional component 30 to form friction, etc.

[0045] The functional component 30 of this embodiment does not require additional power supply and does not generate any excess magnetic field, so it has little impact on the electroacoustic conversion component 20, and can effectively ensure the performance of the electroacoustic device 100. There are many optional materials that can be triboelectrically charged, and the triboelectric charging method is also relatively simple, so the structural design and material selection of the functional component 30 can be simplified.

[0046] In one possible embodiment, please refer to Figure 3 and Figure 4 , Figure 3 for Figure 1 The functional component 30 of the electroacoustic device 100 shown in the figure includes a first functional component 301 and a second functional component 302. Figure 4 for Figure 3The schematic diagram of a partial enlargement of the functional component 30 in the electroacoustic device 100 shown. The functional component 30 includes a first functional part 301 and a second functional part 302. The electron affinity of the first functional part 301 is different from the electron affinity of the second functional part 302. In the process of the functional component 30 converting part of the acoustic energy in the rear sound cavity 102 into electrical energy, charge transfer occurs between the first functional part 301 and the second functional part 302. In the drawings of the present application, the first functional part 301 and the second functional part 302 are distinguished and indicated by thinner lines and thicker lines, respectively, which are not used to characterize the thickness relationship between the first functional part 301 and the second functional part 302.

[0047] Optionally, the electron affinity of the first functional component 301 is stronger than the electron affinity of the second functional component 302. In this case, when the functional component 30 converts part of the sound energy in the rear sound cavity 102 into electrical energy, the first functional component 301 gains electrons and becomes negatively charged, and the second functional component 302 loses electrons and becomes positively charged; or, the electron affinity of the first functional component 301 is weaker than the electron affinity of the second functional component 302. In this case, when the functional component 30 converts part of the sound energy in the rear sound cavity 102 into electrical energy, the first functional component 301 loses electrons and becomes positively charged, and the second functional component 302 gains electrons and becomes negatively charged.

[0048] In this embodiment, the functional component 30 includes a first functional part 301 and a second functional part 302. The electron affinity of the first functional part 301 is different from that of the second functional part 302. This is more conducive to frictional electrification between the first functional part 301 and the second functional part 302, thereby improving the effectiveness of the functional component 30 in converting part of the sound energy in the rear sound cavity 102 into electrical energy based on the frictional electrification effect.

[0049] In one possible embodiment, please refer to Figure 3 and Figure 4 , at least one of the first functional part 301 and the second functional part 302 moves with the help of part of the sound energy in the rear sound cavity 102, and / or, at least one of the first functional part 301 and the second functional part 302 is deformed with the help of part of the sound energy in the rear sound cavity 102.

[0050] It can be understood that the first functional component 301 moves with the help of part of the sound energy in the rear sound cavity 102, and / or the second functional component 302 moves with the help of part of the sound energy in the rear sound cavity 102, and / or the first functional component 301 is deformed with the help of part of the sound energy in the rear sound cavity 102, and / or the second functional component 302 is deformed with the help of part of the sound energy in the rear sound cavity 102.

[0051] The movement of the first functional part 301 includes but is not limited to vibration of at least part of the first functional part 301, or rotation of at least part of the first functional part 301, or movement of the first functional part 301. The movement of the second functional part 302 includes but is not limited to vibration of at least part of the second functional part 302, or rotation of at least part of the second functional part 302, or movement of the second functional part 302. The deformation of the first functional part 301 includes but is not limited to contraction of at least part of the first functional part 301, or stretching of at least part of the first functional part 301. The deformation of the second functional part 302 includes but is not limited to contraction of at least part of the second functional part 302, or stretching of at least part of the second functional part 302.

[0052] At least one of the first functional part 301 and the second functional part 302 moves with the help of part of the sound energy in the rear sound cavity 102, which can be understood as the sound waves in the rear sound cavity 102 causing the flow of air in the rear sound cavity 102. When the flowing air passes through at least one of the first functional part 301 and the second functional part 302, it will push at least one of the first functional part 301 and the second functional part 302 to move. At least one of the first functional part 301 and the second functional part 302 is deformed with the help of part of the sound energy in the rear sound cavity 102, which can be understood as the sound waves in the rear sound cavity 102 causing the flow of air in the rear sound cavity 102. When the flowing air passes through at least one of the first functional part 301 and the second functional part 302, it will cause at least one of the first functional part 301 and the second functional part 302 to deform.

[0053] Optionally, the first functional part 301 moves with the help of part of the acoustic energy in the rear sound cavity 102, and the second functional part 302 does not move or deform. During the movement of the first functional part 301, it rubs against the second functional part 302, and charge transfer occurs. When the first functional part 301 is separated from the second functional part 302, a voltage is generated between the two due to the existence of positive and negative charges; or, the first functional part 301 moves with the help of part of the acoustic energy in the rear sound cavity 102, and the second functional part 302 moves with the help of part of the acoustic energy in the rear sound cavity 102. During the movement of the first functional part 301 and the second functional part 302, they rub against each other and charge transfer occurs. When the first functional part 301 is separated from the second functional part 302, a voltage is generated between the two due to the existence of positive and negative charges; Alternatively, the first functional component 301 is deformed with the help of part of the acoustic energy in the rear sound cavity 102, and the second functional component 302 does not move or deform. During the deformation of the first functional component 301, it rubs against the second functional component 302, and charge transfer occurs. When the first functional component 301 is separated from the second functional component 302, a voltage is generated between the two due to the existence of positive and negative charges. Alternatively, the first functional component 301 is deformed with the help of part of the acoustic energy in the rear sound cavity 102, and the second functional component 302 is deformed with the help of part of the acoustic energy in the rear sound cavity 102. During the deformation of the first functional component 301 and the second functional component 302, they rub against each other, and charge transfer occurs. When the first functional component 301 is separated from the second functional component 302, a voltage is generated between the two due to the existence of positive and negative charges.

[0054] This embodiment makes at least one of the first functional part 301 and the second functional part 302 move with the help of part of the sound energy in the rear sound cavity 102, and / or at least one of the first functional part 301 and the second functional part 302 is deformed with the help of part of the sound energy in the rear sound cavity 102, which is beneficial to consuming the sound energy in the rear sound cavity 102 and causing friction between the first functional part 301 and the second functional part 302, so that part of the sound energy in the rear sound cavity 102 can be converted into electrical energy based on the frictional electrification effect.

[0055] In a possible embodiment, when at least one of the first functional part 301 and the second functional part 302 moves along a first direction, a frictional charging effect is formed between the first functional part 301 and the second functional part 302, and when at least one of the first functional part 301 and the second functional part 302 moves along a second direction, a frictional charging effect is formed between the first functional part 301 and the second functional part 302; wherein the first direction is different from the second direction.

[0056] It can be understood that in this embodiment, when at least one of the first functional part 301 and the second functional part 302 moves along the first direction or the second direction, the first functional part 301 and the second functional part 302 can be frictionally electrified. It can be understood that when the first functional part 301 moves along the first direction, the first functional part 301 and the second functional part 302 can be frictionally electrified, when the first functional part 301 moves along the second direction, the first functional part 301 and the second functional part 302 can be frictionally electrified, when the second functional part 302 moves along the first direction, the first functional part 301 and the second functional part 302 can be frictionally electrified, when the second functional part 302 moves along the second direction, the first functional part 301 and the second functional part 302 can be frictionally electrified.

[0057] The first direction and the second direction may be perpendicular to each other. For example, one of the first direction and the second direction may be perpendicular to the surface of the diaphragm 201 , and the other of the first direction and the second direction may be parallel to the surface of the diaphragm 201 .

[0058] In this embodiment, whether the first functional part 301 and the second functional part 302 can be frictionally charged is less affected by the movement direction of the first functional part 301 and the second functional part 302, that is, whether the first functional part 301 and the second functional part 302 can be frictionally charged is not affected by the movement direction of the first functional part 301 and the second functional part 302.

[0059] Of course, in other possible embodiments, when at least one of the first functional part 301 and the second functional part 302 moves in any one of a plurality of directions, frictional electrification can be generated between the first functional part 301 and the second functional part 302. The plurality of directions may be three different directions, or four different directions, or five different directions, etc.

[0060] In another possible embodiment, when at least one of the first functional component 301 and the second functional component 302 moves in any direction, friction electrification occurs between the first functional component 301 and the second functional component 302. In this embodiment, any movement of the functional component 30 in any direction can cause friction electrification, making the friction electrification more effective.

[0061] In one possible embodiment, please refer to Figure 3 and Figure 4 The material of the functional component 30 includes fiber. Optionally, all the functional components 30 are made of fiber material, or part of the functional components 30 are made of fiber material.

[0062] The functional component 30 as a whole can be in the shape of a mass, a sheet, a column, a sphere, etc. In the embodiment where the functional component 30 includes a first functional part 301 and a second functional part 302, the first functional part 301 as a whole can be in the shape of a mass, a sheet, a column, a sphere, etc., and the second functional part 302 as a whole can be in the shape of a mass, a sheet, a column, a sphere, etc.

[0063] Optionally, in an embodiment where the functional component 30 includes a first functional part 301 and a second functional part 302, the material of the first functional part 301 includes fiber, and / or the material of the second functional part 302 includes fiber. Exemplarily, the material of the first functional part 301 includes nanocomposite fiber, that is, the first functional part 301 includes one or more composite fiber filaments with a diameter less than or equal to 1000 nm; the material of the second functional part 302 includes nanocomposite fiber, that is, the second functional part 302 includes one or more composite fiber filaments with a diameter less than or equal to 1000 nm.

[0064] By making the functional component 30 include fibers, the functional component 30 is more likely to deform and move, which is beneficial to achieve friction electrification inside the functional component 30. In addition, nano-scale fibers are more likely to rub against each other due to their finer surface structures.

[0065] In a possible embodiment, Figure 4 As shown, the functional component 30 is formed with a plurality of pores 303 , and the functional component 30 is also used to absorb another part of the sound energy in the rear sound cavity 102 .

[0066] In this embodiment, the sound waves in the rear sound cavity 102 enter the pores 303 of the functional component 30, causing the air in the pores 303 to vibrate. Due to the friction between the air and the pore wall, the viscous resistance of the air, and the friction between the air and the functional component 30, the kinetic energy of the vibrating air is continuously converted into heat energy, thereby attenuating the sound energy in the rear sound cavity 102. In other words, the functional component 30 is also used to convert another part of the sound energy in the rear sound cavity 102 into heat energy.

[0067] In the embodiment where the functional component 30 includes a first functional part 301 and a second functional part 302, the functional component 30 may be formed with a plurality of pores 303, which may be formed with a plurality of pores 303 in the first functional part 301, and / or, formed with a plurality of pores 303 in the second functional part 302, and / or, a plurality of pores 303 are formed between the first functional part 301 and the second functional part 302. The plurality of pores 303 may include open pores 303, and / or closed pores 303. The plurality of pores 303 may be independent of each other, or interconnected, or semi-connected.

[0068] In this embodiment, the functional component 30 can convert the sound energy in the rear sound cavity 102 into electrical energy and output it, and can also convert the sound energy in the rear sound cavity 102 into heat energy for consumption. Therefore, the reflection of sound waves in the rear sound cavity 102 can be reduced to a large extent, thereby further improving the transmission performance of low-frequency sound and improving the sound quality of electroacoustic devices 100 such as speakers.

[0069] like Figure 5 As shown, Figure 5 for Figure 3 The illustrated diagram is a comparison diagram of frequency response curves of the electroacoustic device 100 with and without the functional component 30 . Figure 5 The middle curve a is a frequency response curve when the electroacoustic device 100 is provided with the functional component 30. Figure 5 The middle curve b is the frequency response curve when the electroacoustic device 100 is provided with no functional component 30. The horizontal axis is the frequency and the vertical axis is the loudness of the output sound. Figure 5 It can be seen from the curve a and the curve b that after the functional component 30 is provided, the low-frequency gain of the electroacoustic device 100 is increased and the low-frequency sound performance is improved.

[0070] In addition, please refer to Figure 6 and Figure 7 The present application also provides an electronic device 1000, Figure 6 A schematic diagram of the structure of an electronic device 1000 provided in an embodiment of the present application is shown in FIG. Figure 7 for Figure 6 A schematic diagram of an electrical signal transmission path in an electronic device 1000 is shown. The electronic device 1000 includes but is not limited to a device capable of making sound, such as a mobile phone, a tablet, a watch, etc. In the embodiment of the present application, the electronic device 1000 takes a mobile phone as an example. The electronic device 1000 includes a power amplifier 200 and the electroacoustic device 100 described in any of the above embodiments.

[0071] The power amplifier 200 is used to receive the electrical signal transmitted by the audio signal source 300, and output it to the electro-acoustic device 100 after amplification. In the embodiment of the present application, the electronic device 1000 may also include an audio signal source 300. The audio signal source 300 and the power amplifier 200 may be integrated together, or may be relatively independently arranged. The audio signal source 300 is electrically connected to the power amplifier 200, which may be a direct electrical connection or an indirect electrical connection.

[0072] The power amplifier 200 is electrically connected to the electroacoustic conversion component 20. The power amplifier 200 and the electroacoustic conversion component 20 may be directly electrically connected, or may be indirectly electrically connected. In the embodiment of the present application, the input end of the power amplifier 200 is electrically connected to the audio signal source 300, and the output end of the power amplifier 200 is electrically connected to the coil of the electroacoustic conversion component 20. The power amplifier 200 is used to output a first electrical signal to the electroacoustic conversion component 20, so that the electroacoustic conversion component 20 undergoes electroacoustic conversion.

[0073] In a possible embodiment, Figure 7 As shown, the electronic device 1000 further includes a first conversion circuit 400. The input end of the first conversion circuit 400 is electrically connected to the functional component 30, and the output end of the first conversion circuit 400 is electrically connected to the power amplifier 200. The first conversion circuit 400 is used to convert the electrical signal output by the functional component 30, and output a second electrical signal to the power amplifier 200, and the power amplifier 200 is used to adjust the magnitude of the first electrical signal according to the second electrical signal.

[0074] The input end of the first conversion circuit 400 may be directly electrically connected to the functional component 30, or may be indirectly electrically connected. In the embodiment where the functional component 30 includes the first functional component 301 and the second functional component 302, the first conversion circuit 400 includes two input ends, which are respectively described as the first input end and the second input end in the following embodiments. The first input end of the first conversion circuit 400 is electrically connected to the first functional component 301, and the second input end of the first conversion circuit 400 is electrically connected to the second functional component 302. The output end of the first conversion circuit 400 may be directly electrically connected to the power amplifier 200, or may be indirectly electrically connected. In this embodiment, the electrical signal output by the functional component 30 may include a positive voltage AC signal and a negative voltage AC signal.

[0075] Please refer to Figure 7 and Figure 8 , Figure 8 for Figure 7 A schematic diagram of a second electrical signal output by the first conversion circuit 400 in the electronic device 1000 is shown. The first conversion circuit 400 is used to convert the electrical signal output by the functional component 30 into a positive voltage AC signal and output it to the power amplifier 200. It can be understood that the second electrical signal is a positive voltage AC signal.

[0076] It can be understood that in this embodiment, the power amplifier 200 can adjust the first electrical signal output to the electroacoustic conversion component 20 based on the second electrical signal fed back by the first conversion circuit 400. In this way, real-time dynamic monitoring of the resonant frequency of the electroacoustic conversion component 20 can be achieved, which is conducive to more accurate control of the amplitude of the electroacoustic conversion component 20, so that the power amplifier 200 can work at full capacity, the low-frequency sound amplitude of the electroacoustic device 100 also reaches the maximum, and the output sound is more heavy.

[0077] In a possible embodiment, Fig. 9 As shown, Fig. 9 for Figure 6 Another schematic diagram of an electrical signal transmission path in the electronic device 1000 is shown. The electronic device 1000 further includes a battery 500 and a second conversion circuit 600, wherein an input end of the second conversion circuit 600 is electrically connected to the functional component 30, and an output end of the second conversion circuit 600 is electrically connected to the battery 500, and the second conversion circuit 600 is used to convert the electrical signal output by the functional component 30 and output a third electrical signal to the battery 500 to charge the battery 500.

[0078] In this embodiment, the battery 500 is a rechargeable battery, including but not limited to a lithium-ion battery, a lithium polymer battery, a nickel-chromium battery, a nickel-metal hydride battery, etc. The input end of the second conversion circuit 600 can be directly electrically connected to the functional component 30, or can be indirectly electrically connected. The output end of the second conversion circuit 600 can be directly electrically connected to the battery 500, or can be indirectly electrically connected. The second conversion circuit 600 is used to convert the electrical signal output by the functional component 30 into a direct current signal and output it to the battery 500. It can be understood that the third electrical signal is a direct current signal.

[0079] The second conversion circuit 600 and the first conversion circuit 400 may be integrated together, or may be relatively independently arranged. Fig.10 As shown, Fig.10 for Figure 6 Another schematic diagram of the electrical signal transmission path in the electronic device 1000 is shown. The input end of the second conversion circuit 600 can be electrically connected to the functional component 30 through the first conversion circuit 400. In this embodiment, the second conversion circuit 600 is used to convert the positive voltage current electrical signal output by the first conversion circuit 400 into a direct current electrical signal, and then output it to the battery 500 to charge the battery 500.

[0080] This embodiment utilizes the functional component 30 to convert part of the sound energy in the rear sound cavity 102 into electrical energy and output it to the battery 500, which not only solves the problem that the lightweight development of the electronic device 1000 and the transmission efficiency of low-frequency sound cannot be taken into account at the same time, but also effectively utilizes the electrical energy converted by the functional component 30 to charge the battery 500, thereby extending the use time of the electronic device 1000.

[0081] The features mentioned in the description, claims and drawings can be combined with each other as desired as long as they are meaningful within the scope of the present application. The advantages and features described for the electroacoustic device 100 are applicable to the electronic device 1000 in a corresponding manner.

[0082] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present application, and these improvements and modifications are also regarded as the scope of protection of the present application.

Claims

1. An electroacoustic device, characterized in that include: case; An electroacoustic conversion component is disposed in the shell, a front sound cavity and a rear sound cavity are formed between the electroacoustic conversion component and the shell, and the front sound cavity and the rear sound cavity are relatively disposed on two sides of the electroacoustic conversion component; and A functional component is arranged in the rear sound cavity, and is used to convert part of the sound energy in the rear sound cavity into electrical energy and output it.

2. The electroacoustic device according to claim 1, characterized in that The functional component converts part of the sound energy in the rear sound cavity into electrical energy based on the friction electrification effect.

3. The electroacoustic device according to claim 2, characterized in that The functional component includes a first functional part and a second functional part, the electron affinity of the first functional part is different from the electron affinity of the second functional part, and in the process of the functional component converting part of the sound energy in the rear sound cavity into electrical energy, charge transfer occurs between the first functional part and the second functional part.

4. The electroacoustic device according to claim 3, characterized in that At least one of the first functional part and the second functional part moves with the help of part of the sound energy in the rear sound cavity, and / or at least one of the first functional part and the second functional part is deformed with the help of part of the sound energy in the rear sound cavity.

5. The electroacoustic device according to claim 4, characterized in that When at least one of the first functional part and the second functional part moves along a first direction, a frictional charging effect is formed between the first functional part and the second functional part; when at least one of the first functional part and the second functional part moves along a second direction, a frictional charging effect is formed between the first functional part and the second functional part; wherein the first direction is different from the second direction.

6. The electroacoustic device according to claim 2, characterized in that The material of the functional component includes fiber.

7. The electroacoustic device according to any one of claims 1 to 6, characterized in that: The functional component is formed with a plurality of pores, and the functional component is also used to absorb another part of the sound energy in the rear sound cavity.

8. An electronic device, characterized in that: It comprises a power amplifier and the electroacoustic device according to any one of claims 1 to 7, wherein the power amplifier is electrically connected to the electroacoustic conversion component, and the power amplifier is used to output a first electrical signal to the electroacoustic conversion component so that the electroacoustic conversion component performs electroacoustic conversion.

9. The electronic device according to claim 8, characterized in that: The electronic device also includes a first conversion circuit, an input end of the first conversion circuit is electrically connected to the functional component, and an output end of the first conversion circuit is electrically connected to the power amplifier. The first conversion circuit is used to convert the electrical signal output by the functional component and output a second electrical signal to the power amplifier. The power amplifier is used to adjust the size of the first electrical signal according to the second electrical signal.

10. The electronic device according to claim 8, characterized in that: The electronic device also includes a battery and a second conversion circuit, wherein an input end of the second conversion circuit is electrically connected to the functional component, and an output end of the second conversion circuit is electrically connected to the battery. The second conversion circuit is used to convert the electrical signal output by the functional component and output a third electrical signal to the battery to charge the battery.

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