Acoustic output device

Abstract

The embodiment of the invention provides an acoustic output device. The acoustic output device comprises a shell; the driving device is accommodated in the shell, and the driving device vibrates to generate sound and leads out the sound through a sound outlet hole formed in the shell; the liquid discharging piece is arranged at the sound outlet hole; the ultrasonic transmitting module is used for outputting an ultrasonic excitation signal; wherein the liquid discharge part comprises an oscillation unit and a plurality of hole parts, the plurality of hole parts comprise a plurality of sound transmission holes allowing sound to be transmitted, and the oscillation unit generates ultrasonic oscillation under the action of the ultrasonic excitation signal so as to discharge liquid at the sound transmission holes and near the sound transmission holes.

Description

Technical Field

[0001] The present application relates to the field of acoustics, and in particular to an acoustic output device. Background Art

[0002] With the development of acoustic output technology, acoustic output devices (e.g., headphones) have been widely used in people's daily lives. They may be provided with holes (e.g., sound outlet holes, tuning holes, sound pickup holes, etc.) to achieve sound conduction. Affected by the use environment of the acoustic output device, the holes on the acoustic output device may be attached with liquids such as water, sweat, and oil. The liquid may clog the holes and damage the internal components of the acoustic output device, seriously affecting the acoustic performance of the acoustic output device and reducing the listening quality of the user.

[0003] Therefore, it is necessary to provide an acoustic output device that can easily remove liquids such as water, sweat, and oil attached to the hole portion to ensure the acoustic performance of the acoustic output device and the listening quality of the user. Summary of the invention

[0004] One of the embodiments of the present specification provides an acoustic output device, which includes: a housing; a driving device, which is contained in the housing, and the driving device vibrates to generate sound and is output through a sound outlet hole provided on the housing; a liquid discharge member, which is provided at the sound outlet hole; and an ultrasonic transmitting module, which is used to output an ultrasonic excitation signal; wherein the liquid discharge member includes an oscillation unit and a plurality of hole portions, and the plurality of hole portions include a plurality of sound holes that allow sound transmission, and the oscillation unit oscillates ultrasonically under the action of the ultrasonic excitation signal to discharge the liquid at and near the sound hole. When the liquid discharge member oscillates ultrasonically under the drive of the oscillation unit, the liquid at and near the sound hole undergoes ultrasonic atomization, so that the liquid at and near the sound hole is discharged smoothly, thereby avoiding the liquid from blocking the sound hole, so as to ensure the acoustic performance of the acoustic output device and the listening quality of the user.

[0005] In some embodiments, the aperture of the sound hole is greater than or equal to 0.1 mm, so that the size of the sound hole is appropriate, the sound transmission effect of the sound hole is optimized, and the number of atomized droplets entering the acoustic output device is reduced.

[0006] In some embodiments, the multiple hole portions include a plurality of atomization holes, and along the thickness direction from the inside to the outside of the shell, the aperture of any of the atomization holes gradually decreases along its axial direction, so that the atomization holes form a cone structure, so as to utilize the self-transportation property of droplets inside the micron-scale cone, so that the atomized droplets inside the atomization holes of the cone structure will spontaneously move to the end with a smaller aperture and be discharged to the outside of the shell.

[0007] In some embodiments, the first opening of the atomization hole close to the outside of the shell has a first aperture, and the first aperture is 1 μm-15 μm; the second opening of the atomization hole close to the inside of the shell has a second aperture, and the ratio of the second aperture to the first aperture is 3-10. By designing the size of the atomization hole, the self-transportability of the droplets formed by atomization inside the atomization hole can be guaranteed, and the discharge effect of the atomized droplets in the atomization hole can be optimized.

[0008] In some embodiments, the spacing between any of the atomization holes and the nearest sound hole is 10 μm-500 μm, so that the distance between the atomization hole and the sound hole is appropriate, thereby avoiding damage to the smaller atomization holes when processing the sound holes, and at the same time enabling the atomization holes to attract more atomized droplets diffused from the sound holes to be discharged outside the shell.

[0009] In some embodiments, for any of the sound-through holes, the hole closest to it is one of the several atomization holes, so that the atomization hole can evenly absorb and guide the atomized droplets diffused in the adjacent sound-through holes to be discharged outside the shell.

[0010] In some embodiments, on the liquid discharge member, the average amplitude of the region where the plurality of atomization holes are located is greater than the average amplitude of other regions, so that more atomized droplets can be discharged to the outside of the shell through the atomization holes.

[0011] In some embodiments, the total area of ​​the plurality of atomization holes is 3.5 kμm 2 -35kμm 2 , thereby enabling the drainage component to have a better drainage effect while meeting the sound conduction requirements of the sound outlet.

[0012] In some embodiments, a hydrophobic material is provided on one side of the drainage member close to the inside of the shell, and / or a hydrophobic material is provided on the other side of the drainage member close to the outside of the shell. By providing a hydrophobic material on one side of the drainage member close to the inside of the shell, water can be further prevented from entering the shell. By providing a hydrophobic material on the other side of the drainage member close to the outside of the shell, water in the atomization hole can be facilitated to be discharged from the outside of the shell. By providing a hydrophobic material on both sides of the drainage member close to the inside and outside of the shell, the drainage performance of the drainage member for water inside the shell can be enhanced while avoiding water from entering the shell, thereby enhancing the waterproof and drainage effects of the drainage member.

[0013] In some embodiments, the oscillation unit includes a substrate layer and a piezoelectric layer partially covering the substrate layer, the multiple holes are arranged in the area of ​​the substrate layer not covered by the piezoelectric layer, and the thickness of the substrate layer is 0.05mm-0.15mm; or, the oscillation unit includes a piezoelectric sheet, and the piezoelectric sheet is provided with the multiple holes. The design of the substrate layer and the piezoelectric layer can enhance the reliability of the oscillation unit. By designing the substrate layer, while ensuring that the substrate layer has a suitable average amplitude, the substrate layer can have a higher reliability and extend the service life of the substrate layer. The design of the piezoelectric sheet can reduce the complexity of the structure.

[0014] In some embodiments, the acoustic output device further comprises a liquid detection sensor, the liquid detection sensor being configured to: detect liquid on the liquid discharge member and output a detection signal; the ultrasonic emission module being configured to: output the ultrasonic excitation signal in response to the detection signal output by the liquid detection sensor. The liquid detection sensor can be used to detect whether liquid is attached to and near the liquid discharge member, and output a corresponding detection signal based on different liquid data. Based on different detection signals, the ultrasonic emission module determines a driving voltage and / or frequency corresponding to the ultrasonic excitation signal, so as to make the liquid discharge member enter different oscillation modes according to different conditions.

[0015] In some embodiments, the ultrasonic excitation signal is related to the state of the acoustic output device. Determining the ultrasonic excitation signal according to the state of the acoustic output device can avoid excessive driving voltage and frequency of the required ultrasonic excitation signal, resulting in excessive power consumption of the output ultrasonic excitation signal, thereby avoiding affecting the working performance of the acoustic output device.

[0016] In some embodiments, when the acoustic output device is in working state, the ultrasonic excitation signal has a first driving voltage; when the acoustic output device is in idle state, the ultrasonic excitation signal has a second driving voltage; the first driving voltage is less than the second driving voltage. When the acoustic output device is in working state, the first driving voltage of the ultrasonic excitation signal is relatively small to reduce the oscillation amplitude of the oscillation unit, thereby reducing the power consumption of the liquid discharge member. When the acoustic output device is in idle state, the second driving voltage of the ultrasonic excitation signal is relatively large to increase the oscillation amplitude of the oscillation unit, thereby increasing the density of droplets formed by atomization of the liquid discharge member, so as to timely adjust the power consumption of the acoustic output device and ensure the liquid discharge effect of the liquid discharge member.

[0017] In some embodiments, when the acoustic output device is in working state, the ultrasonic excitation signal has a first frequency; when the acoustic output device is in idle state, the ultrasonic excitation signal has a second frequency, and the first frequency is less than the second frequency. When the acoustic output device is in working state, the frequency of the ultrasonic excitation signal is reduced to reduce the oscillation frequency of the oscillation unit, thereby reducing the drain power consumption of the drain member; when the acoustic output device is in idle state, the frequency of the ultrasonic excitation signal is increased to increase the oscillation frequency of the oscillation unit, thereby reducing the droplet size formed by the atomization of the drain member and improving the drain effect.

[0018] In some embodiments, the detection signal includes the volume of the liquid, and the ultrasonic excitation signal is related to the volume of the liquid. By adjusting the ultrasonic excitation signal according to the volume of the liquid, the power consumption of the acoustic output device can be used and allocated more reasonably, avoiding meaningless waste of power consumption.

[0019] In some embodiments, when the volume of the liquid is less than or equal to a preset volume threshold, the ultrasonic excitation signal has a third driving voltage; when the volume of the liquid is greater than the preset volume threshold, the ultrasonic excitation signal has a fourth driving voltage; the third driving voltage is less than the fourth driving voltage. When the volume of the liquid is less than or equal to the preset volume threshold, it means that the liquid volume is small, the required drainage strength of the drainage member is low, and the ultrasonic transmitting module determines that the third driving voltage of the ultrasonic excitation signal can be small; when the volume of the liquid is greater than the preset volume threshold, it means that the liquid volume is large, the required drainage strength of the drainage member is high, and the ultrasonic transmitting module determines that the fourth driving voltage of the ultrasonic excitation signal can be large.

[0020] In some embodiments, when the volume of the liquid is less than or equal to a preset volume threshold, the ultrasonic excitation signal has a third frequency; when the volume of the liquid is greater than the preset volume threshold, the ultrasonic excitation signal has a fourth frequency, and the third frequency is less than the fourth frequency. When the volume of the liquid is less than or equal to the preset volume threshold, it means that the liquid volume is small, the required drainage strength of the drainage member is low, and the ultrasonic emission module determines that the third frequency of the ultrasonic excitation signal can be small; when the volume of the liquid is greater than the preset volume threshold, it means that the liquid volume is large, the required drainage strength of the drainage member is high, and the ultrasonic emission module determines that the fourth frequency of the ultrasonic excitation signal can be large.

[0021] In some embodiments, the acoustic output device further includes a trigger module, the trigger module is used to receive a user instruction; the ultrasonic emission module is configured to: output the ultrasonic excitation signal based on the user instruction. Through the above settings, the user can independently adjust the drainage strength and power consumption of the drainage member, thereby improving the user experience of the acoustic output device.

[0022] In some embodiments, the ultrasonic excitation signal is related to the user instruction. Based on the difference in the user instruction, the ultrasonic excitation signal is adjusted to adjust the drainage intensity and power consumption of the drainage member.

[0023] In some embodiments, the user instruction includes a first instruction and a second instruction, when the user instruction outputs the first instruction, the ultrasonic excitation signal has a fifth driving voltage; when the user instruction outputs the second instruction, the ultrasonic excitation signal has a sixth driving voltage; the fifth driving voltage is less than the sixth driving voltage. Based on the difference in user instructions, the ultrasonic excitation signal is adjusted to adjust the drainage strength and power consumption of the drainage member.

[0024] In some embodiments, the user instruction includes a first instruction and a second instruction, when the user instruction outputs the first instruction, the ultrasonic excitation signal has a fifth frequency; when the user instruction outputs the second instruction, the ultrasonic excitation signal has a sixth frequency, and the fifth frequency is less than the sixth frequency. Based on the difference in user instructions, the ultrasonic excitation signal is adjusted to adjust the drainage strength and power consumption of the drainage member. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] This specification will be further described in the form of exemplary embodiments, which will be described in detail by the accompanying drawings. These embodiments are not restrictive, and in these embodiments, the same number represents the same structure, wherein:

[0026] Figure 1 is an exemplary structural diagram of an acoustic output device according to some embodiments of this specification;

[0027] Figure 2 is an exemplary module diagram of an acoustic output device according to some embodiments of this specification;

[0028] Figure 3 is an exemplary structural diagram when the oscillation unit shown in some embodiments of this specification includes a piezoelectric sheet;

[0029] Figure 4 is a schematic diagram of the structure of a liquid discharge member according to some embodiments of the present specification;

[0030] Figure 5 is a schematic diagram of the structure of a liquid discharge member according to some embodiments of the present specification;

[0031] Fig. 6A is a schematic diagram of the distribution of the sound holes and the atomization holes on the liquid discharge member according to some embodiments of this specification;

[0032] Figure 6Bis a schematic diagram of the distribution of the sound holes and the atomization holes on the liquid discharge member according to some other embodiments of this specification;

[0033] Figure 6C is a schematic diagram of the distribution of the sound holes and the atomization holes on the liquid discharge member according to other embodiments of this specification;

[0034] Figure 7 is a flow chart for determining an ultrasonic excitation signal according to some embodiments of this specification;

[0035] Figure 8 is a flow chart of determining the state of an acoustic output device based on an ultrasonic excitation signal according to some embodiments of the present specification;

[0036] Fig. 9 is a flow chart of determining an ultrasonic excitation signal based on an output signal of a liquid detection sensor according to some embodiments of this specification;

[0037] Fig.10 This is a flow chart of determining an ultrasonic excitation signal based on a user instruction according to some embodiments of this specification. DETAILED DESCRIPTION

[0038] In order to more clearly illustrate the technical solutions of the embodiments of this specification, the following is a brief introduction to the drawings required for the description of the embodiments. Obviously, the drawings described below are only some examples or embodiments of this specification. For ordinary technicians in this field, this specification can also be applied to other similar scenarios based on these drawings without creative work. Unless it is obvious from the language environment or otherwise explained, the same reference numerals in the figures represent the same structure or operation.

[0039] It should be understood that the "system", "device", "unit" and / or "module" used herein are a method for distinguishing different components, elements, parts, portions or assemblies at different levels. However, if other words can achieve the same purpose, the words can be replaced by other expressions.

[0040] As shown in this application and claims, unless the context clearly indicates an exception, the words "a", "an", "an" and / or "the" do not refer to the singular and may also include the plural. Generally speaking, the terms "comprises" and "includes" only indicate the inclusion of the steps and elements that have been clearly identified, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements.

[0041] In the description of this specification, it should be understood that the terms "first", "second", "third", "fourth", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first", "second", "third", "fourth" may explicitly or implicitly include at least one of the features. In the description of this specification, "plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0042] In this specification, unless otherwise clearly specified and limited, the terms "connection", "fixation" and the like should be understood in a broad sense. For example, the term "connection" can refer to a fixed connection, a detachable connection, or an integral connection; it can refer to a mechanical connection or an electrical connection; it can refer to a direct connection or an indirect connection through an intermediate medium, it can refer to the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in this specification can be understood according to the specific circumstances.

[0043] Flowcharts are used in this specification to illustrate the operations performed by the system according to the embodiments of this specification. It should be understood that the preceding or following operations are not necessarily performed precisely in order. Instead, the steps may be processed in reverse order or simultaneously. At the same time, other operations may also be added to these processes, or one or more operations may be removed from these processes.

[0044] Figure 1 is an exemplary structural diagram of an acoustic output device according to some embodiments of this specification. Figure 1 As shown, the acoustic output device 10 may include a drive device 11 and a housing 12 .

[0045] In some embodiments, the acoustic output device 10 may include but is not limited to bone conduction earphones, air conduction earphones, bone-air conduction earphones, etc. In some embodiments, the acoustic output device 10 may be in-ear earphones, semi-in-ear earphones, or open earphones, etc. In some embodiments, the acoustic output device 10 may be combined with glasses, headphones, head-mounted display devices, AR / VR helmets, and other products.

[0046] The housing 12 may have a receiving cavity for accommodating the drive device 11. It should be noted that the housing 12 may be, for example, a rectangular parallelepiped, cylindrical, terraced, L-shaped, U-shaped, V-shaped, or any irregular shape and combination thereof, and is not limited to the shapes shown in the figure.

[0047] The driving device 11 (e.g., a diaphragm) is used to convert an excitation signal (e.g., an electrical signal) into a corresponding mechanical vibration to generate sound. In some embodiments, the driving device 11 is accommodated in a housing cavity of the housing 12, and the driving device 11 separates the housing cavity into a front cavity 121 and a rear cavity 122 of the acoustic output device 10.

[0048] In some embodiments, a sound outlet hole 13 is provided on the shell 12, which is used to guide the sound generated by the driving device 11 out of the shell 12 and then transmit it to the user's ear canal, so that the user can hear the sound. A discharge member for discharging liquid may be provided at the sound outlet hole 13. In some embodiments, the sound outlet hole 13 may include a first sound outlet hole 131 and / or a second sound outlet hole 132. Among them, the first sound outlet hole 131 is acoustically coupled with the front cavity 121, and the sound generated by the front cavity 121 is guided out of the shell 12 and then transmitted to the ear canal. The second sound outlet hole 132 is acoustically coupled with the rear cavity 122, and the sound generated by the rear cavity 122 is guided out of the shell 12. In some embodiments, the first sound guided out of the first sound outlet hole 131 can be anti-phased with the second sound guided out of the second sound outlet hole 132 in the far field of the acoustic output device 10, which is conducive to reducing the sound leakage of the acoustic output device 10 in the far field. The acoustic output device 10 here may include a semi-in-ear earphone or an open earphone. In some embodiments, drainage components may be disposed at the first sound outlet hole 131 and the second sound outlet hole 132 .

[0049] In some embodiments, the second sound outlet 132 guides the sound generated by the rear cavity 122, and can release the excess air pressure in the rear cavity 122 to balance the air pressure inside the acoustic output device 10. The acoustic output device 10 here may include an in-ear headphone. In some embodiments, since the second sound outlet 132 is used for pressure relief, its hole area may be smaller than the hole area of ​​the first sound outlet 131, so a drainage member may be provided only at the first sound outlet 131.

[0050] In some embodiments, the acoustic output device 10 may be a bone conduction headset, and the driving device 11 may be used to drive the panel of the housing 12 to vibrate, and transmit the vibration to the user's skull to generate sound. In this case, a sound outlet 13 for exporting sound waves in the housing 12 may be provided on the housing 12 to offset the sound leakage generated by the vibration of the housing 12 pushing the air, thereby reducing the sound leakage of the acoustic output device 10. In this case, a drainage member may be provided at the sound outlet 13.

[0051] In the use scenario of the acoustic output device 10, the sound outlet 13 (including the first sound outlet 131 and / or the second sound outlet 132) of the acoustic output device 10 may be attached by liquid (such as rainwater, sweat, oil and other common liquids in life), causing the sound outlet 13 to be blocked, affecting the sound wave conduction of the sound outlet 13, and thus affecting the acoustic performance of the acoustic output device 10. In some embodiments, the acoustic output device 10 includes a liquid discharge member for discharging liquid, and the liquid discharge member can generate ultrasonic oscillation, which destroys the surface tension of the liquid and ultrasonically atomizes the liquid attached to the sound outlet 13, so as to facilitate the liquid to be separated from the sound outlet 13 and avoid clogging the sound outlet 13. In some embodiments, in order to discharge the liquid at the sound outlet 13 out of the acoustic output device 10, to prevent the liquid from entering the acoustic output device 10 and damaging the components, and affecting the working performance of the acoustic output device 10, the vibration direction of the liquid discharge member can be along the axial direction of the sound outlet 13, that is, the liquid discharge direction can be along the thickness direction from the inside of the shell 12 to the outside of the shell 12, and the liquid is discharged from the inside of the shell 12. In order to further improve the liquid discharge effect, the liquid discharge member can be provided with a guiding structure that limits the flow direction of the droplets formed after atomization, thereby promoting the liquid at the sound outlet 13 to be discharged from the acoustic output device 10, and improving the liquid discharge rate. In some embodiments, the liquid discharge member can be located in the sound outlet 13.

[0052] In some embodiments, the liquid discharge member includes an oscillation unit. The oscillation unit can receive an ultrasonic excitation signal and generate ultrasonic oscillations. The ultrasonic excitation signal is output by an ultrasonic transmitting module. In some embodiments, the oscillation amplitude generated by the oscillation unit is positively correlated with the voltage of the ultrasonic excitation signal, and the number of periodic oscillations completed by the oscillation unit per unit time (i.e., the oscillation frequency) is positively correlated with the frequency of the ultrasonic excitation signal. Specifically, the higher the voltage / frequency of the ultrasonic excitation signal, the higher the oscillation amplitude / oscillation frequency of the oscillation unit. The oscillation of the oscillation unit can ultrasonically atomize the liquid attached to the sound outlet 13. The oscillation amplitude and oscillation frequency of the oscillation unit will affect the effect of ultrasonic atomization. The effect of ultrasonic atomization can be characterized by the droplet size and droplet density formed after the liquid is atomized. The oscillation amplitude of the oscillation unit is proportional to the droplet density formed by atomization, that is, the larger the amplitude, the greater the droplet density. The oscillation frequency of the oscillation unit is inversely proportional to the droplet size formed by atomization, that is, the higher the frequency, the smaller the droplet size. In some embodiments, the oscillation unit can be in a regular or irregular shape such as annular, rectangular, circular, etc. For more descriptions of the liquid discharge member and its structure, please refer to other places in this specification, such as Figure 3-6C etc. and their descriptions.

[0053] Figure 2 is an exemplary module diagram of an acoustic output device according to some embodiments of this specification. Figure 2As shown, the acoustic output device 10 may include a liquid detection sensor 21 , a trigger module 22 and an ultrasonic emission module 23 .

[0054] The liquid detection sensor 21 is used to detect whether there is liquid attached to the liquid discharge member and its vicinity. In some embodiments, the liquid detection sensor 21 detects the presence of liquid on the liquid discharge member, and outputs a detection signal to the ultrasonic emission module 23 .

[0055] In some embodiments, the liquid detection sensor 21 may include a capacitive water drop sensor. The capacitive water drop sensor uses the characteristic that the dielectric constant of the liquid is different from the dielectric constant of the air and the object to detect the presence of the liquid. The capacitive water drop sensor may be a DS18B20 digital temperature sensor, a DHT11 temperature and humidity sensor, etc. In some embodiments, the liquid detection sensor 21 may include a photoelectric water drop sensor. The photoelectric water drop sensor uses the photoelectric effect to detect the presence of the liquid. When the liquid enters the sensor, it blocks the transmission of light, thereby detecting the presence of the liquid. The photoelectric water drop sensor may be a water drop sensor module YL-83, a TTP223 touch switch module, etc. In some embodiments, the liquid detection sensor 21 may include a pressure water drop sensor. The pressure water drop sensor detects the presence of the liquid by pressure changes. When the liquid drops into the sensor, a certain pressure change will be generated, thereby detecting the presence of the liquid. The pressure water drop sensor may be a sheet pressure sensor, a piezoelectric sensor, etc.

[0056] In some embodiments, the acoustic output device may include a main control circuit, and the liquid detection sensor 21 detects the presence of liquid on the discharge member, and transmits the detection signal to the main control circuit, and the main control circuit outputs a feedback signal to the ultrasonic transmitting module 23, and the ultrasonic transmitting module 23 transmits a corresponding ultrasonic excitation signal based on the received feedback signal. In some embodiments, after the liquid detection sensor 21 detects the presence of liquid on the discharge member, it can continue to transmit the detection signal to the main control circuit until the liquid detection sensor 21 detects that there is no liquid on the discharge member (or the liquid parameters on the discharge member meet the preset conditions, such as the liquid volume is less than the preset threshold, etc.), and the main control circuit continues to output the feedback signal to the ultrasonic transmitting module 23 until the detection signal stops transmitting. In some embodiments, after the liquid detection sensor 21 detects the presence of liquid on the discharge member, it can continue to transmit the detection signal to the main control circuit within a preset duration, and the preset duration for the liquid detection sensor 21 to output the detection signal can be set according to the actual application requirements, for example, the preset duration can be set to 1s, 3s or 5s, etc. After the preset duration, the liquid detection sensor 21 can immediately stop outputting the detection signal.

[0057] The trigger module 22 is used to receive user instructions and output a control signal to the ultrasonic transmitting module 23. In some embodiments, when the user believes that the acoustic output device 10 needs to be drained, the user instruction can be input through the trigger module 22. The trigger module 22 receives the user instruction, that is, outputs a control signal to the main control circuit, and the main control circuit then outputs a feedback signal to the ultrasonic transmitting module 23, and the ultrasonic transmitting module 23 transmits a corresponding ultrasonic excitation signal based on the received feedback signal. In some embodiments, a button is provided on the acoustic output device 10 as a trigger module 22, and the user can input the user instruction by long pressing or short pressing or continuously pressing or touching the button. In some embodiments, a touch area is provided on the acoustic output device 10 as a trigger module 22, and the user can input the user instruction by single-clicking, double-clicking or sliding. It should be understood that the user instruction can be input into the acoustic output device 10 through any variety of ways or methods, and the description of the button or touch area as the trigger module 22 in this specification is only for the purpose of convenience.

[0058] In some embodiments, the user instruction may include adjustment information for adjusting the ultrasonic excitation signal. In some embodiments, the adjustment information includes adjusting the voltage and frequency of the ultrasonic excitation signal. In response to the adjustment of the voltage and frequency of the ultrasonic excitation signal, the amplitude and frequency of the oscillation unit are adjusted accordingly, thereby achieving the purpose of adjusting the discharge strength (i.e., atomization effect) of the discharge member, wherein the discharge strength of the discharge member is positively correlated with the oscillation amplitude and oscillation frequency of the discharge member. For example only, when the user needs to autonomously control the discharge (e.g., after swimming is over), the user instruction can be input by pressing or touching a button on the acoustic output device 10, and the adjustment information is reflected by the length of time or number of times the button (i.e., the trigger module 22) is pressed or touched. For example, the longer the time or the more times the button is pressed or touched, the higher the voltage and frequency of the ultrasonic excitation signal output by the ultrasonic transmitting module 23, and the stronger the discharge strength of the discharge member.

[0059] In some embodiments, after receiving the user instruction, the trigger module 22 can continuously output the control signal to the main control circuit. In some embodiments, the duration of the output signal of the trigger module 22 can be set according to the actual application requirements, for example, the duration can be set to 1s, 3s or 5s, etc. When the duration has passed, the trigger module 22 immediately stops outputting the control signal. In some embodiments, the liquid detection sensor 21 detects that there is no liquid on the discharge part, and the liquid detection sensor 21 outputs a stop instruction to the trigger module 22 through the main control circuit, and the trigger module 22 stops outputting the control signal.

[0060] The oscillation unit 24 on the discharge member generates ultrasonic oscillation in response to the ultrasonic excitation signal output by the ultrasonic transmitting module 23. In some embodiments, the oscillation unit 24 is a component that can respond to high-frequency (e.g., 1 MHz-3 MHz) frequency vibration. In some embodiments, the oscillation unit 24 may include a piezoelectric material. Exemplary piezoelectric materials may include piezoelectric ceramics, piezoelectric crystals, piezoelectric polymers (e.g., polyvinylidene fluoride), etc. or any combination thereof. Due to the inverse piezoelectric effect of the piezoelectric material, when the ultrasonic excitation signal (i.e., the electrical signal) acts on the oscillation unit 24, the oscillation unit 24 will generate high-frequency mechanical vibrations.

[0061] In order to ensure the working performance of the acoustic output device 10 and the ability of the sound outlet hole 13 to conduct sound waves, a plurality of holes are also provided on the liquid discharge member. When the oscillation unit 24 generates ultrasonic oscillation in response to the ultrasonic excitation signal, it drives the liquid discharge member to vibrate, so that the liquid attached to the hole portion is atomized, and the liquid at the sound outlet hole 13 is discharged to prevent the liquid from clogging the hole portion and affecting the transmission of the sound. In some embodiments, the liquid discharge member can fill the entire sound outlet hole to ensure the liquid discharge effect. Specifically, the sound outlet hole 13 (for example Figure 1 The first sound outlet hole 131 and / or the second sound outlet hole 132 shown in the figure penetrates the shell, and accordingly, the sound outlet hole 13 has a hole wall, and the peripheral side of the discharge piece can be connected to the hole wall by a combination of one or several methods such as clamping, gluing, etc. In some embodiments, the discharge piece can have a base (not shown in the figure), and the peripheral side of the base is connected to the hole wall by a combination of one or several methods such as clamping, gluing, etc., and the oscillation unit 24 is arranged on the base, and the arrangement of the base can enhance the structural strength of the discharge piece. At this time, the base is provided with a plurality of holes, and the oscillation unit 24 can drive the base to vibrate to achieve drainage. In some embodiments, the oscillation unit 24 can be directly used as the base of the discharge piece to simplify the structure of the discharge piece and reduce the material cost. At this time, the peripheral side of the oscillation unit 24 can be connected to the hole wall, and a plurality of holes are arranged on the oscillation unit 24. The following takes the structure in which the discharge piece does not include a base as an example to illustrate the vibration drainage of the discharge piece.

[0062] Figure 3 It is an exemplary structural diagram when the oscillation unit shown in some embodiments of the present specification includes a piezoelectric sheet. In some embodiments, the oscillation unit 24 may include a piezoelectric sheet. The piezoelectric sheet serves as the piezoelectric layer of the oscillation unit 24, and the peripheral side of the piezoelectric sheet can be directly connected to the hole wall of the sound outlet hole 13 on the shell 12, and a plurality of hole portions are provided on the piezoelectric sheet. The piezoelectric sheet may include the above-mentioned piezoelectric material. The piezoelectric sheet can generate ultrasonic oscillations in response to an ultrasonic excitation signal to achieve a liquid discharge function. At this time, since the edge area of ​​the piezoelectric sheet is connected to the hole wall of the sound outlet hole, the vibration of the edge area of ​​the piezoelectric sheet is limited, and the amplitude of the middle area of ​​the piezoelectric sheet is larger. A plurality of hole portions can be provided in the middle area of ​​the piezoelectric sheet, such as Figure 3 shown.

[0063] Figure 4 is a schematic diagram of the structure of the liquid discharge member according to some embodiments of this specification. Figure 4 In order to prevent the oscillation unit 24 from being directly connected to the hole wall and affecting the vibration frequency and amplitude of the oscillation unit 24, the oscillation unit may include a substrate layer 33 and a piezoelectric layer 34. The circumferential side of the substrate layer 33 is connected to the hole wall of the sound outlet hole, and the piezoelectric layer 34 is arranged on the substrate layer 33. The piezoelectric layer 34 includes the above-mentioned piezoelectric material, and the piezoelectric layer 34 drives the substrate layer 33 to perform ultrasonic oscillation in response to the ultrasonic excitation signal. In some embodiments, the shape of the piezoelectric layer 34 and the position distribution on the substrate layer 33 can determine the vibration amplitude of different areas of the substrate layer 33, thereby affecting the setting position of multiple hole portions on the substrate layer 33. In some embodiments, multiple hole portions can be arranged in areas on the substrate layer 33 that are not covered by the piezoelectric layer 34. For example, when the piezoelectric layer 34 is annular, the piezoelectric layer 34 can be arranged at the edge area of ​​the substrate layer 33 close to the peripheral side. At this time, the average amplitude of the central area of ​​the substrate layer 33 during ultrasonic oscillation is the largest. Affected by the connection with the hole wall, the average amplitude of the substrate layer 33 decreases as it extends from the central area to the peripheral side. Multiple holes can be arranged on the substrate layer 33 area located inside the piezoelectric layer 34 to ensure the vibration amplitude at the multiple holes. For details, please refer to Fig. 6A , Figure 6B And related descriptions. For another example, when the piezoelectric layer 34 is a circular, elliptical, concave / convex polygonal structure, the piezoelectric layer 34 can be arranged in the middle area of ​​the substrate layer 33. At this time, when the substrate layer 33 is ultrasonically oscillated under the drive of the piezoelectric layer 34, the average amplitude of the area between the edge area of ​​the substrate layer 33 and the area covered by the piezoelectric layer 34 is larger, and the average amplitude of the edge area of ​​the substrate layer 33 is smaller. At this time, a plurality of holes can be arranged in the area between the edge area of ​​the substrate layer 33 and the area covered by the piezoelectric layer 34. Exemplarily, when the piezoelectric layer 34 is strip-shaped and arranged in the middle area of ​​the substrate layer 33, the piezoelectric layer 34 on the substrate layer 33 can be spaced apart from a plurality of holes to ensure that the plurality of holes can cover more vibration areas. For details, please refer to Figure 6C and related descriptions.

[0064] In some embodiments, when the area of ​​the piezoelectric layer 34 is relatively large (for example, the shape and area of ​​the piezoelectric layer 34 are the same as those of the substrate layer 33), the area of ​​the substrate layer 33 not covered by the piezoelectric layer 34 is relatively small, and a plurality of holes may be provided in the area covered by the piezoelectric layer 34 on the substrate layer 33. In this case, the arrangement of the plurality of holes is similar to the case where the oscillation unit 24 includes only a piezoelectric sheet, and the plurality of holes may penetrate the substrate layer 33 and the piezoelectric layer 34 at the same time.

[0065] In some embodiments, to ensure the average amplitude of the substrate layer 33, the substrate layer 33 is Figure 4The thickness dimension in the Z direction shown in the figure should not be too large, but considering the reliability of the substrate layer 33, the thickness dimension of the substrate layer 33 along the Z direction should not be too small. Therefore, in some embodiments, the thickness range of the substrate layer 33 along the Z direction can be 0.05mm-0.15mm. In some embodiments, in order to increase the average amplitude of the substrate layer 33, the thickness range of the substrate layer 33 along the Z direction can be 0.05mm-0.12mm. In some embodiments, in order to improve the reliability of the substrate layer 33 and extend the service life of the substrate layer 33, the thickness range of the substrate layer 33 along the Z direction can be 0.08mm-0.12mm.

[0066] In some embodiments, since the drainage member may often come into contact with slightly corrosive liquids (such as sweat), in order to ensure the reliability of the drainage member, the material of the substrate layer 33 may include anti-corrosion metal, such as SUS304 stainless steel.

[0067] In other embodiments, when the liquid discharge member includes an oscillation unit 24 and a substrate, the arrangement relationship between the oscillation unit 24 and the substrate can refer to the arrangement relationship between the piezoelectric layer 34 and the substrate layer 33 in the oscillation unit 24, which will not be repeated here.

[0068] Figure 5 Schematic diagram of the structure of the liquid discharge member according to some embodiments of this specification. Figure 5 As shown, the plurality of holes provided on the discharge member 30 include a plurality of sound holes 31 .

[0069] The sound hole 31 connects the inside and outside of the housing 12 of the acoustic output device 10, allowing the transmission of sound to ensure the output performance of the acoustic output device 10. In some embodiments, when the sound hole 31 on the discharge member 30 is attached or blocked by liquid, the transmission of sound will be affected or even blocked. When the discharge member 30 is ultrasonically oscillated under the drive of the oscillation unit 24, the liquid at and near the sound hole 31 is ultrasonically atomized, so that the liquid at and near the sound hole 31 is smoothly discharged, thereby preventing the liquid from blocking the sound hole 31. In some embodiments, the vicinity of the sound hole 31 may refer to an area that is no more than 100 μm away from the hole wall of the sound hole 31.

[0070] If the aperture a of the sound hole 31 (see Figure 5) is too small, which will affect the transmission of sound and even weaken the transmission of sound. In some embodiments, to avoid the aperture of the sound hole 31 affecting the transmission of sound, the aperture a of the sound hole 31 is greater than or equal to 0.1mm. If the aperture a of the sound hole 31 is too large, the volume of liquid attached to the sound hole 31 is too large, which will affect the atomization effect of the liquid, resulting in poor discharge effect of the liquid in the sound hole 31. In some embodiments, to avoid the aperture of the sound hole 31 affecting the atomization effect, the aperture a of the sound hole 31 is not greater than 0.5mm. In some embodiments, to avoid the aperture of the sound hole 31 affecting the transmission and atomization effect of sound, the size range of the aperture a of the sound hole 31 is 0.1mm-0.5mm. In some embodiments, to optimize the sound transmission effect of the sound hole 31 and reduce the number of atomized droplets entering the interior of the acoustic output device 10, the size range of the aperture a of the sound hole 31 is 0.2m-0.5mm. In some embodiments, in order to further optimize the sound-passing effect of the sound-passing hole 31 , the size range of the aperture a of the sound-passing hole 31 is 0.3 mm-0.5 mm.

[0071] In some embodiments, when the liquid discharge member 30 is ultrasonically oscillating, the liquid in the sound hole 31 is ultrasonically atomized and discharged from the sound hole 31, but the atomized liquid droplets may diffuse from the sound hole 31 to the inside of the housing 12, or may diffuse from the sound hole 31 to the outside of the housing 12. In order to prevent liquid from entering the housing 12, it is necessary to guide the atomized liquid droplets to be discharged to the outside of the housing 12 as much as possible. In some embodiments, the plurality of hole portions further include a plurality of atomization holes 32 for guiding the liquid droplets to be discharged to the outside of the housing 12.

[0072] In the thickness direction Z of the housing 12 from the inside to the outside (see Figure 4 ), the aperture of the atomizing hole 32 gradually decreases along its axial direction to form a cone structure. Inside the micron-sized cone, the droplets will spontaneously move to the end with a smaller aperture. Due to the self-transportation of the droplets, the atomized droplets inside the atomizing hole 32 forming the cone structure will spontaneously move to the end with a smaller aperture to be discharged outside the housing 12.

[0073] In some embodiments, in order to ensure the self-transportability of the droplets formed by atomization inside the atomization hole 32, the size of the atomization hole 32 needs to be maintained at the micron level. In some embodiments, the end with a smaller aperture on the atomization hole 32, that is, the first opening on the side close to the outside of the shell 12, has a first aperture. Considering the difficulty of processing the atomization hole 32 on the discharge member 30, the size range of the first aperture is 1μm-15μm. In some embodiments, the end with a larger aperture on the atomization hole 32, that is, the second opening on the side close to the inside of the shell, has a second aperture, and the size of the second aperture is greater than the size of the first aperture. In some embodiments, in order to maintain the taper of the cone structure formed by the atomization hole 32, so as to ensure the discharge effect of the atomized droplets in the atomization hole 32, the size ratio of the second aperture to the first aperture is 3-10. Thus, in some embodiments, the size range of the second aperture is 3μm-150μm. In some embodiments, in order to optimize the discharge effect of the atomized droplets in the atomization hole 32, the size ratio of the second aperture to the first aperture is 5-10. In some embodiments, to further optimize the discharge effect of the atomized droplets, the size ratio of the second aperture to the first aperture is 5 to 8. In some embodiments, the atomization hole 32 can be made by laser drilling.

[0074] In the daily working scene of the acoustic output device 10, the liquid with a relatively high contact frequency at the sound outlet 13 generally includes water, and the drainage member 30 can be additionally designed with emphasis on waterproofing and drainage. In some embodiments, in order to further prevent water from entering the shell 12, a hydrophobic material is provided on one side of the drainage member 30 close to the inside of the shell 12. In some embodiments, in order to promote the water in the atomization hole 32 to be discharged from the outside of the shell 12, a hydrophobic material is provided on one side of the drainage member 30 close to the outside of the shell 12. In some embodiments, in order to enhance the waterproofing and drainage effect of the drainage member 30, the drainage performance of the drainage member 30 for the water inside the shell 12 can be enhanced while preventing water from entering the shell 12, that is, a hydrophobic material is provided on one side of the drainage member 30 close to the inside of the shell 12, and a hydrophobic material is also provided on one side of the drainage member 30 close to the outside of the shell 12. Exemplarily, the hydrophobic material may include, but is not limited to, Teflon (i.e., polytetrafluoroethylene) and the like.

[0075] In some embodiments, in order to reduce the processing difficulty of the drainage member 30 and reduce the process cost, the atomization hole 32 may not be set on the drainage member 30, but only the above-mentioned hydrophilic material and / or hydrophobic material may be set to achieve a certain waterproof effect. In some embodiments, in order to simplify the structure at the sound outlet 13 and reduce the assembly difficulty, the above-mentioned hydrophilic material and / or hydrophobic material may not be set on the drainage member 30, but the drainage effect is achieved through the atomization hole 32. In some embodiments, in order to have a better drainage effect and obtain a better waterproof effect, the above-mentioned hydrophilic material and / or hydrophobic material may be set on the drainage member 30 while setting the atomization hole 32.

[0076] In some embodiments, the hydrophilic material and / or the hydrophobic material can cover the area around the location of the atomization hole 32 on the discharge member 30. For example, the hydrophilic material and / or the hydrophobic material can be designed into a ring shape so that the atomization hole 32 is in the inner area of ​​the ring structure to enhance the guidance of the atomization hole 32 on the movement of water or water droplets formed after atomization to the outside of the shell 12. In some embodiments, a hydrophobic material is provided on the hole wall of the sound outlet hole, which is conducive to promoting the discharge of water from the sound outlet hole and reducing the adhesion of water in the sound outlet hole. In some embodiments, a hydrophobic material is provided on the hole wall of the sound outlet hole and around the location of the sound outlet hole on the inner and outer surfaces of the shell, which is conducive to promoting the discharge of water to the outside of the shell and reducing the adhesion of water in the sound outlet hole.

[0077] In some embodiments, the sound hole 31 is used to conduct sound to the user's ear canal, and the atomization hole 32 is used to guide the liquid to be discharged outside the housing 12. In the process of ultrasonic oscillation and liquid discharge of the liquid discharge member 30, the liquid (such as water) in the sound hole 31 is atomized to form droplets that will diffuse to both sides of the liquid discharge member 30 (i.e., inside and outside the housing 12). In order to reduce the droplets inside the housing 12, the atomization hole 32 can be arranged near the sound hole 31. The self-transportability of the droplets is optimized through the structural design of the atomization hole 32 and the design of the opening position, so that the droplets are discharged from the housing 12. Since the size of the atomization hole 32 itself is small, if the distance between the sound hole 31 and the atomization hole 32 is too close, it will cause mutual influence when processing the sound hole 31 and the atomization hole 32, increasing the difficulty of the process. If the distance between the sound hole 31 and the atomization hole 32 is too far, the atomization hole 32 will not be able to contact as much as possible and guide the atomized droplets diffused from the sound hole 31 to be discharged outward, affecting the liquid discharge effect. Therefore, in some embodiments, the distance b between any atomization hole 32 and the nearest sound hole 31 (see Figure 4) has a size range of 10μm-500μm. In some embodiments, in order to avoid damaging the smaller atomization holes 32 when processing the sound holes 31, the size range of the distance b between any atomization hole 32 and the nearest sound hole 31 is 50μm-500μm. In some embodiments, in order to enable the atomization hole 32 to attract more atomized droplets diffused from the sound holes 31 to be discharged outside the shell 12, the size range of the distance b between any atomization hole 32 and the nearest sound hole 31 is 50μm-300μm. The exemplary distribution of the sound holes 31 and the atomization holes 32 on the discharge member 30 can be referred to Figure 6A-6C It should be noted that the spacing b between the atomizing hole 32 and the sound-through hole 31 refers to the minimum distance between the hole walls of the two holes. That is, the line connecting the center of the atomizing hole 32 and the center of the sound-through hole 31 has an intersection with the hole wall of the atomizing hole 32 and the hole wall of the sound-through hole 31 respectively, and the spacing between the two intersections is the minimum distance between the hole walls of the two holes.

[0078] Fig. 6A It is a schematic diagram of the distribution of sound holes and atomization holes on the liquid discharge member according to some embodiments of this specification. Figure 6B It is a schematic diagram of the distribution of sound holes and atomization holes on the liquid discharge member according to some other embodiments of the present specification. Figure 6C Schematic diagram of the distribution of sound holes and atomization holes on the liquid discharge member according to other embodiments of this specification. Fig. 6A and Figure 6B The drainage member 30 shown is circular in shape. Figure 6C The drainage member 30 is shown to be square in shape.

[0079] like Fig. 6A As shown, the sound holes 31 and the atomization holes 32 are arranged alternately on the liquid discharge member 30, so that the atomization holes 32 can evenly absorb and guide the atomized liquid droplets diffused in the adjacent sound holes 31 to be discharged outside the housing 12. In some embodiments, for any sound hole 31, the hole closest to it is one of the several atomization holes 32. In some embodiments, at least one atomization hole 32 is arranged between any sound hole 31 and any other sound hole 31.

[0080] like Figure 6B As shown, the plurality of sound holes 31 are distributed in an annular array, and the plurality of atomization holes 32 are all arranged inside the annular array formed by the plurality of sound holes 31. That is to say, the plurality of atomization holes 32 are concentratedly distributed, and the plurality of sound holes 31 are distributed around the atomization holes 32, so as to avoid mutual influence when processing the sound holes 31 and the atomization holes 32. In some alternative embodiments, the plurality of atomization holes 32 are distributed in an annular array, and the plurality of sound holes 31 are all arranged inside the annular array.

[0081] like Figure 6CAs shown, a plurality of sound holes 31 are concentratedly distributed, and a plurality of atomization holes 32 are distributed on both sides of the plurality of sound holes 31. In some embodiments, in order to ensure that the distance between the sound holes 31 and the atomization holes 32 is not too far, so as to ensure the drainage effect of the atomization holes 32, a plurality of sound holes 31 are distributed in rows or columns, and a plurality of atomization holes 32 are arranged on both sides of the sound holes 31. In some alternative embodiments, a plurality of atomization holes 32 are concentratedly distributed, and a plurality of sound holes 31 are distributed on both sides of a plurality of atomization holes 32. In some embodiments, a plurality of sound holes 31 and a plurality of atomization holes 32 may be distributed in rows or columns. For example, in the array distribution of the sound holes 31 and the atomization holes 32, odd rows or columns are a plurality of sound holes 31, and even rows or columns are a plurality of atomization holes 32.

[0082] In some embodiments, when the liquid discharge member 30 is subjected to ultrasonic oscillation, the amplitude of each region on the liquid discharge member 30 may be different. The amplitude of each region on the liquid discharge member 30 can be obtained by comparing the shape of the liquid discharge member 30 at the maximum vibration position with the shape when not vibrating (initial shape). The shape of the liquid discharge member 30 at the maximum vibration position can be captured by continuous shooting with a high-speed camera. The amplitude of each region on the liquid discharge member 30 is related to the oscillation unit 24 (for example, the distribution of the piezoelectric material on the oscillation unit 24). By designing the oscillation unit 24, the amplitude of each region on the liquid discharge member 30 can be regulated. The larger the vibration amplitude, the greater the density of the droplets formed after atomization. When the frequency is constant, the size of the droplets formed after atomization is similar or the same. Therefore, the position with a larger vibration amplitude has more droplets atomized and the better the liquid discharge effect. In order to allow more atomized droplets to be guided to the outside of the housing 12 through the atomization hole 32, the atomization hole 32 can be set at a position where there are more atomized droplets, that is, the atomization hole 32 can be set at a region with a larger amplitude on the discharge member 30. In some embodiments, the average amplitude of the region where the atomization hole 32 is located (i.e., the region where the atomization hole 32 is set) can be greater than the average amplitude of other regions.

[0083] In some embodiments, when the drainage member 30 includes a substrate and an oscillating unit 24, the oscillating unit 24 may be an annular structure, which is disposed near the edge region of the substrate of the drainage member 30 near the peripheral side. When the drainage member 30 is driven by the oscillating unit 24 to perform ultrasonic oscillation, the average amplitude of the middle region of the drainage member 30 is larger, and the average amplitude of the edge region of the drainage member 30 is smaller. At this time, referring to Fig. 6A , a plurality of sound holes 31 and a plurality of atomization holes 32 are mixedly arranged in the middle area of ​​the liquid discharge member 30 (i.e., the area inside the area covered by the piezoelectric layer 34 in the annular structure on the substrate layer 33). At this time, there is an atomization hole 32 distributed near any sound hole 31, and the liquid droplets in the sound hole 31 are not easy to remain. Or, see Figure 6B, a plurality of atomizing holes 32 are concentrated in the middle area of ​​the liquid discharge member 30, and a plurality of sound holes 31 surround the atomizing holes 32 and are distributed in the area between the edge area and the center area of ​​the liquid discharge member 30. At this time, the average amplitude of the atomizing holes 32 is relatively large, and the liquid droplets formed by the liquid in the sound holes 31 after atomization diffuse into the inside of the housing 12 are discharged from the outside of the housing 12 through the atomizing holes 32, and the liquid discharge effect of the liquid discharge member 30 is better.

[0084] In some embodiments, when the discharge member 30 does not include a base, the peripheral side of the substrate layer 33 of the oscillation unit 24 can be connected to the hole wall of the sound outlet hole 13 to achieve fixation, and the piezoelectric layer 34 of the oscillation unit 24 can be a ring-shaped structure. The piezoelectric layer 34 is arranged on the substrate layer 33 near the edge area of ​​its peripheral side, and the sound holes 31 and the atomization holes 32 are directly arranged on the middle area of ​​the substrate layer 33 of the oscillation unit 24. When the oscillation unit 24 performs ultrasonic oscillation, the average amplitude of the central area is larger, and the average amplitude of the edge area close to the peripheral side is smaller. At this time, the distribution of the sound holes 31 and the atomization holes 32 on the substrate layer 33 can be as follows: Fig. 6A As shown, the hybrid is arranged in the middle area of ​​the liquid discharge member 30 (ie, the area inside the piezoelectric layer 34 covering the annular structure on the substrate layer 33); or Figure 6B As shown, the atomization holes 32 are concentrated in the middle area of ​​the liquid discharge member 30, and the sound holes 31 are in a ring array and are distributed between the area where the atomization holes 32 are set and the area covered by the piezoelectric layer 34.

[0085] In some embodiments, when the discharge member 30 includes a base and an oscillation unit 24, the oscillation unit 24 may be a circular, elliptical, concave / convex polygonal structure, etc., which is arranged in the middle area of ​​the discharge member 30. When the discharge member 30 is driven by the oscillation unit 24 to perform ultrasonic oscillation, the average amplitude of the area between the edge area of ​​the discharge member 30 and the coverage area of ​​the oscillation unit 24 is larger, and the average amplitude of the edge area on the discharge member 30 is smaller. At this time, a plurality of sound holes 31 are concentrated and distributed in the coverage area of ​​the oscillation unit 24, and a plurality of atomization holes 32 are distributed in the surrounding area (for example, the two side areas) of the oscillation unit 24 on the discharge member 30. The droplets in the sound holes 31 are atomized and discharged to the outside of the shell 12 through the atomization holes 32. For example, referring to Figure 6C When the oscillation unit 24 is in a strip shape, the sound holes 31 can be distributed in rows / columns corresponding to the coverage area of ​​the oscillation unit 24 , and the atomization holes 32 can be distributed in rows / columns on both sides of the oscillation unit 24 .

[0086] In some embodiments, when the liquid discharge member 30 does not include a base, the peripheral side of the substrate layer 33 of the oscillation unit is connected to the hole wall of the sound outlet to achieve fixation, and the piezoelectric layer 34 of the oscillation unit can be a piezoelectric layer 34 with a circular, elliptical, concave / convex polygonal structure, etc. The piezoelectric layer 34 can be arranged in the middle area of ​​the substrate layer 33. When the substrate layer 33 is ultrasonically oscillated under the drive of the piezoelectric layer 34, the average amplitude of the area between the edge area of ​​the substrate layer 33 and the area covered by the piezoelectric layer 34 is larger, and the average amplitude of the edge area of ​​the substrate layer 33 is smaller. At this time, a number of sound holes 31 are concentrated and distributed in the corresponding area covered by the piezoelectric layer 34, and a number of atomization holes 32 are distributed in the peripheral area of ​​the piezoelectric layer 34 on the substrate layer 33 (for example, the two side areas). The droplets in the sound holes 31 are atomized and discharged to the outside of the shell 12 through the atomization holes 32. For example, referring to Figure 6C When the substrate layer 33 is in a strip shape, the sound holes 31 can be distributed in rows / columns corresponding to the coverage area of ​​the piezoelectric layer 34, and the atomization holes 32 can be distributed in rows / columns on both sides of the piezoelectric layer 34.

[0087] In some embodiments, in order to ensure the effect of the atomization hole 32 discharging liquid to the outside of the shell 12, the atomization holes 32 should have a sufficient total area or number. However, if the total area of ​​a plurality of atomization holes 32 is too large or the number is too large, it will result in insufficient area on the discharge part 30 where the sound holes 31 can be set, affecting the sound conduction of the sound outlet hole 13. Therefore, in some embodiments, the number of atomization holes 32 is 500-2000. In some embodiments, in order to balance the discharge effect of the discharge part 30 and the sound conduction requirements of the sound outlet hole 13, the number of atomization holes 32 is 800-1800. In some embodiments, in order to further improve the discharge effect of the discharge part 30, the number of atomization holes 32 is 1000-1500. In some embodiments, the total area of ​​a plurality of atomization holes 32 on the side of the discharge part 30 close to the inside of the shell 12 is 3.5kμm 2 -35kμm 2 In some embodiments, in order to balance the liquid discharge effect of the liquid discharge member 30 and the sound conduction requirement of the sound outlet 13, the total area of ​​the atomization holes 32 on the side of the liquid discharge member 30 close to the inside of the housing is 5.7 kμm 2 -32kμm 2 In some embodiments, in order to further improve the discharge effect of the discharge member 30, the total area of ​​the plurality of atomization holes 32 on the side of the discharge member 30 close to the inside of the housing is 7 kμm 2 -26kμm 2 .

[0088] In some embodiments, in order to ensure the drainage effect of the drainage component 30, the area of ​​the setting area of ​​the atomization hole 32 and the total area of ​​the drainage component 30 should have a suitable ratio. If the ratio is too large, it may affect the structural strength of the drainage component 30 and affect the sound effect of the sound outlet hole 13. If the ratio is too small, the area on the drainage component 30 used to discharge the liquid inside the shell 12 to the outside of the shell 12 may be too small, affecting the drainage performance of the drainage component 30. In order to ensure the drainage performance of the drainage component 30 without affecting the sound effect of the sound outlet hole 13, in some embodiments, the ratio of the area of ​​the setting area of ​​the atomization hole 32 to the total area of ​​the drainage component 30 can be 0.05-0.2. Just as an example, with Figure 6B The structure shown is similar. When the discharge member 30 is a circular structure, its diameter can be about 16 mm, and the area of ​​the atomization hole 32 in the middle of the discharge member 30 is 10 mm. 2 -40mm 2 . Among them, the area of ​​the setting region of the atomization holes 32 (i.e., the area of ​​the region where the atomization holes 32 are set on the discharge member 30) can be the area formed by the connecting lines of the edges of the multiple atomization holes 32 located on the outermost sides among the multiple atomization holes 32; or, it can be the smallest circular area including the multiple atomization holes 32 (i.e., the circular area inscribed in both of the two atomization holes 32 that are farthest apart). It should be noted that the size, area and number of the sound holes 31 and the atomization holes 32 mentioned in the specification can actually be measured by an industrial microscope.

[0089] Figure 7 It is a flow chart for determining the ultrasonic excitation signal according to some embodiments of this specification.

[0090] like Figure 7 As shown, the step of determining the ultrasonic excitation signal includes: acquiring a related signal; determining a driving voltage and / or frequency of the ultrasonic excitation signal based on the related signal; and outputting the ultrasonic excitation signal based on the determined driving voltage and / or frequency.

[0091] The related signal refers to an electrical signal used to determine the driving voltage and / or frequency of the ultrasonic excitation signal. In some embodiments, the related signal includes an electrical signal sent by a liquid detection sensor or a user instruction. For example, the related signal may be a detection signal sent by a liquid detection sensor. The detection signal includes information such as whether liquid is attached or the amount of attached liquid. For another example, the related signal may be a user instruction, and the user instruction includes information such as adjusting the drainage strength of the drainage member. In some embodiments, the related signal may also be used to determine whether the acoustic output device needs to be drained.

[0092] In some embodiments, based on different related signals, the ultrasonic transmitting module determines the driving voltage and / or frequency corresponding to the ultrasonic excitation signal. Exemplarily, when the related signal corresponds to the acoustic output device that does not need to discharge, the driving voltage and / or frequency corresponding to the ultrasonic excitation signal can be 0; when the related signal corresponds to the acoustic output device with a smaller discharge intensity, the driving voltage and / or frequency corresponding to the ultrasonic excitation signal can be smaller; when the related signal corresponds to the acoustic output device with a larger discharge intensity, the driving voltage and / or frequency corresponding to the ultrasonic excitation signal can be larger. In other embodiments, the driving voltage and / or frequency of the ultrasonic excitation signal corresponding to different related signals may also be the same. For example, when the related signal is a detection signal sent by a liquid detection sensor, if the data about the liquid in the detection signal meets certain conditions, when it is judged that the acoustic output device does not need to discharge, based on different detection signals that meet the above conditions, the driving voltage and / or frequency corresponding to the ultrasonic excitation signal can be 0. For another example, the different related signals corresponding to the detection signal and the user instruction may all correspond to the same discharge intensity of the acoustic output device. At this time, based on the aforementioned different related signals, the driving voltage and / or frequency corresponding to the ultrasonic excitation signal may be the same.

[0093] In some embodiments, the oscillation mode (including frequency and / or amplitude) of the discharge member has one or more. When there are multiple oscillation modes, based on different related signals, the ultrasonic transmitting module can determine the driving voltage and / or frequency of different ultrasonic excitation signals. For example, when the liquid detection sensor detects that the amount of attached liquid is large, the ultrasonic transmitting module determines that the driving voltage and / or frequency of the ultrasonic excitation signal is large, so that the drainage intensity of the discharge member is large. When the liquid detection sensor detects that the amount of attached liquid is small, the ultrasonic transmitting module determines that the driving voltage and / or frequency of the ultrasonic excitation signal is small, so that the drainage intensity of the discharge member is small. For another example, when the user instruction includes information for adjusting the drainage intensity of the discharge member, the ultrasonic transmitting module determines that the driving voltage and / or frequency of the ultrasonic excitation signal is adapted to the corresponding adjusted drainage intensity of the discharge member.

[0094] Figure 8 FIG. 1 is a flow chart of determining an ultrasonic excitation signal based on a state of an acoustic output device according to some embodiments of the present specification. Figure 8 As shown, based on the state of the acoustic output device, the driving voltage and / or frequency of the ultrasonic excitation signal is determined.

[0095] When it is determined based on relevant signals that the acoustic output device needs to be drained, the ultrasonic excitation signal is determined according to the state of the acoustic output device. This can avoid the driving voltage and frequency of the required ultrasonic excitation signal being too high, which would cause the output ultrasonic excitation signal to consume too much power, thereby avoiding affecting the working performance of the acoustic output device.

[0096] In some embodiments, the state of the acoustic output device includes a working state and an idle state. Among them, the working state refers to the state in which the acoustic output device outputs sound. The idle state refers to the state in which the acoustic output device does not output sound. In some embodiments, the ultrasonic transmitting module can obtain the state of the acoustic output device and determine whether the state of the acoustic output device belongs to the working state or the idle state. In some embodiments, the ultrasonic transmitting module can obtain the state of the acoustic output device from the main control circuit. For example, when the power consumption of the main control circuit is high, it can be determined that the acoustic output device is in a working state; when the power consumption of the main control circuit is low, it can be determined that the acoustic output device is in an idle state. In some embodiments, when it is determined that the acoustic output device is in a working state, the ultrasonic transmitting module determines that the ultrasonic excitation signal has a first driving voltage; when the acoustic output device is in an idle state, the ultrasonic transmitting module determines that the ultrasonic excitation signal has a second driving voltage. In some embodiments, since the power consumption of the acoustic output device in the idle state that can be called for outputting the ultrasonic excitation signal is more than that in the working state, the first driving voltage is less than the second driving voltage.

[0097] The ultrasonic excitation signal is determined based on the state of the acoustic output device. When it is determined that the acoustic output device is in a working state, the driving voltage of the ultrasonic excitation signal is reduced to reduce the oscillation amplitude of the oscillation unit, thereby reducing the liquid discharge power consumption of the liquid discharge member. When the acoustic output device is in an idle state, the driving voltage of the ultrasonic excitation signal is increased to increase the oscillation amplitude of the oscillation unit, thereby increasing the density of droplets formed by atomization of the liquid discharge member, so as to timely adjust the power consumption of the acoustic output device and ensure the liquid discharge effect of the liquid discharge member.

[0098] In some embodiments, when it is determined that the acoustic output device is in a working state, the ultrasonic transmitting module determines that the ultrasonic excitation signal has a first frequency; when the acoustic output device is in an idle state, the ultrasonic transmitting module determines that the ultrasonic excitation signal has a second frequency. In some embodiments, since the power consumption of the acoustic output device for outputting the ultrasonic excitation signal in the idle state is greater than that in the working state, the first frequency is less than the second frequency.

[0099] An ultrasonic excitation signal is determined based on the state of the acoustic output device. When it is determined that the acoustic output device is in a working state, the frequency of the ultrasonic excitation signal is reduced to reduce the oscillation frequency of the oscillation unit, thereby reducing the drainage power consumption of the drainage component; when the acoustic output device is in an idle state, the frequency of the ultrasonic excitation signal is increased to increase the oscillation frequency of the oscillation unit, thereby reducing the size of droplets formed by atomization of the drainage component and improving the drainage effect.

[0100] In other embodiments, when the acoustic output device is in a working state, in order to enhance the user experience, avoid clogging of the sound outlet, and ensure the user's listening effect, the first driving voltage and the first frequency of the ultrasonic excitation signal may be relatively large to enhance the drainage effect of the drainage part; when the acoustic output device is in an idle state, the second driving voltage and the second frequency of the ultrasonic excitation signal may be relatively small to save power consumption.

[0101] Fig. 9 This is a flow chart of determining the ultrasonic excitation signal based on the detection signal output by the liquid detection sensor according to some embodiments of this specification. Fig. 9 As shown, the driving voltage and frequency of the ultrasonic excitation signal are determined based on the detection signal output by the liquid detection sensor.

[0102] In some embodiments, the liquid detection sensor can detect the volume of the liquid (i.e., the amount of liquid) present at the acoustic hole, and the detection signal can include the volume data of the liquid. In some embodiments, the ultrasonic transmitting module pre-stores a first preset volume threshold and a second preset volume threshold. The ultrasonic transmitting module receives the volume of the liquid sent by the liquid detection sensor, and determines the size relationship between the volume of the liquid and the first preset volume threshold and the second preset volume threshold. In some embodiments, when the volume of the liquid is less than or equal to the first preset volume threshold, it means that the volume of the liquid can be ignored, and the acoustic output device does not need to perform drainage processing, and the ultrasonic transmitting module determines that the driving voltage of the ultrasonic excitation signal is 0. When the volume of the liquid is greater than the first preset volume threshold and less than the second preset volume threshold, it means that the volume of the liquid is small, the required drainage strength of the drainage member is low, and the ultrasonic transmitting module determines that the ultrasonic excitation signal has a third driving voltage; when the volume of the liquid is greater than the second preset volume threshold, it means that the volume of the liquid is large, the required drainage strength of the drainage member is high, and the ultrasonic transmitting module determines that the ultrasonic excitation signal has a fourth driving voltage; the third driving voltage is less than the fourth driving voltage.

[0103] The ultrasonic excitation signal is determined based on the volume of the liquid detected by the liquid detection sensor. When the volume of the liquid detected by the liquid detection sensor is large, the required liquid discharge strength of the liquid discharge member is high, and the driving voltage of the ultrasonic excitation signal is increased accordingly to increase the oscillation amplitude of the oscillation unit; when the volume of the liquid detected by the liquid detection sensor is small, the required liquid discharge strength of the liquid discharge member is low, and the driving voltage of the ultrasonic excitation signal is reduced accordingly to reduce the oscillation amplitude of the oscillation unit. The power consumption of the acoustic output device can be used and allocated more reasonably to avoid meaningless waste of power consumption.

[0104] In some embodiments, when the volume of the liquid is less than or equal to the first preset volume threshold, it means that the volume of the liquid can be ignored, the acoustic output device does not need to perform drainage processing, and the ultrasonic transmission module determines that the frequency of the ultrasonic excitation signal is 0. When the volume of the liquid is greater than the first preset volume threshold and less than the second preset volume threshold, it means that the volume of the liquid is small, the required drainage strength of the drainage member is low, and the ultrasonic transmission module determines that the ultrasonic excitation signal has a third frequency; when the volume of the liquid is greater than the second preset volume threshold, it means that the volume of the liquid is large, the required drainage strength of the drainage member is high, and the ultrasonic transmission module determines that the ultrasonic excitation signal has a fourth frequency; the third frequency is less than the fourth frequency.

[0105] The ultrasonic excitation signal is determined based on the volume of the liquid detected by the liquid detection sensor. When the volume of the liquid detected by the liquid detection sensor is large, the required liquid discharge strength of the liquid discharge member is high, and the frequency of the ultrasonic excitation signal is increased accordingly to increase the oscillation frequency of the oscillation unit; when the volume of the liquid detected by the liquid detection sensor is small, the required liquid discharge strength of the liquid discharge member is low, and the frequency of the ultrasonic excitation signal is reduced accordingly to reduce the oscillation frequency of the oscillation unit. The power consumption of the acoustic output device can be used and allocated more reasonably to avoid meaningless waste of power consumption.

[0106] It should be understood that the ultrasonic excitation signal is determined based on the volume of the liquid detected by the liquid detection sensor only as an example. In other embodiments, the ultrasonic excitation signal can be determined based on other types of data detected by the liquid detection sensor. For example, the liquid detection sensor can detect the liquid inlet speed or the continuous liquid inlet time. Correspondingly, the detection signal sent by the liquid detection sensor can include the above-mentioned corresponding data related to the liquid. The ultrasonic transmitting module can determine the required liquid discharge strength of the liquid discharge member based on the liquid-related data detected by the liquid detection sensor to determine the driving voltage and frequency of the ultrasonic excitation signal.

[0107] Exemplarily, when the liquid detection sensor detects the continuous liquid inflow time of the liquid (for example, the pressure sensor detects the duration of the pressure), the ultrasonic transmitting module may pre-store a first preset time threshold and a second preset time threshold. The ultrasonic transmitting module receives the continuous liquid inflow time of the liquid sent by the liquid detection sensor, and determines the relationship between the continuous liquid inflow time of the liquid and the magnitude greater than the first preset time threshold and the second preset time threshold. In some embodiments, when the continuous liquid inflow time of the liquid is less than or equal to the first preset time threshold, it means that the liquid volume entering the acoustic output device is very small and can be ignored. The acoustic output device does not need to perform drainage processing, and the ultrasonic transmitting module determines that the driving voltage / frequency of the ultrasonic excitation signal is 0. When the continuous liquid inflow time is greater than the first preset time threshold and less than the second preset time threshold, it means that the liquid entering the acoustic output device is less and the required discharge intensity of the discharge part is lower, and the ultrasonic transmitting module determines that the ultrasonic excitation signal has a third driving voltage / third frequency; when the continuous liquid inflow time is greater than the second preset time threshold, it means that the volume of liquid entering the acoustic output device is larger and the required discharge intensity of the discharge part is higher, and the ultrasonic transmitting module determines that the ultrasonic excitation signal has a fourth driving voltage / fourth frequency; the third driving voltage / third frequency is less than the fourth driving voltage / fourth frequency.

[0108] In other embodiments, the ultrasonic excitation signal determined based on the state of the acoustic output device can be combined with the ultrasonic excitation signal determined based on the volume of the liquid detected by the liquid sensor. For example, the state of the acoustic output device can be determined first, and then whether the volume of the liquid is greater than the preset volume threshold. When it is determined that the acoustic output device is in a working state, the volume of the liquid is less than or equal to the preset volume threshold, the ultrasonic emission module determines that the ultrasonic excitation signal has an A driving voltage / A frequency, and the volume of the liquid is greater than the preset volume threshold, and the ultrasonic emission module determines that the ultrasonic excitation signal has a B driving voltage / B frequency. Among them, the A driving voltage is less than the B driving voltage / the A frequency is less than the B frequency; when it is determined that the acoustic output device is in an idle state, the volume of the liquid is less than or equal to the preset volume threshold, the ultrasonic emission module determines that the ultrasonic excitation signal has a C driving voltage / C frequency, and the volume of the liquid is greater than the preset volume threshold, and the ultrasonic emission module determines that the ultrasonic excitation signal has a D driving voltage / D frequency. Among them, the C driving voltage is less than the D driving voltage / the C frequency is less than the D frequency. At the same time, the A driving voltage is less than the C driving voltage / the A frequency is less than the C frequency, and the B driving voltage is less than the D driving voltage / the B frequency is less than the D frequency.

[0109] Fig.10 FIG. 1 is a flow chart of determining an ultrasonic excitation signal based on a user instruction according to some embodiments of this specification. Fig.10 As shown, based on the user instruction, the driving voltage and frequency of the ultrasonic excitation signal are determined.

[0110] In some embodiments, the user instruction may indicate whether to discharge the discharge member or the discharge strength of the discharge member. In some embodiments, the discharge strength is positively correlated with the frequency and amplitude of the oscillating unit.

[0111] In some embodiments, the trigger module can obtain a user instruction and determine the type of the user instruction. In some embodiments, the user instruction includes a first instruction and a second instruction. The first instruction indicates that the discharge strength of the discharge member is low, and the second instruction indicates that the discharge strength of the discharge member is high. In some embodiments, when the trigger module sends and the ultrasonic transmitter module receives the first instruction, the ultrasonic transmitter module determines that the ultrasonic excitation signal has a first driving voltage; when the trigger module sends and the ultrasonic transmitter module receives the second instruction, the ultrasonic transmitter module determines that the ultrasonic excitation signal has a second driving voltage. The fifth driving voltage is less than the sixth driving voltage.

[0112] The driving voltage of the ultrasonic excitation signal is adjusted based on the different drainage intensities requested by the user. When the drainage intensity requested by the user is low, the driving voltage of the ultrasonic excitation signal is reduced to reduce the oscillation amplitude of the oscillation unit, thereby reducing the density of droplets formed by the atomization of the drainage member. When the drainage intensity requested by the user is high, the driving voltage of the ultrasonic excitation signal is increased to increase the oscillation amplitude of the oscillation unit, thereby increasing the density of droplets formed by the atomization of the drainage member.

[0113] In some embodiments, when the trigger module sends and the ultrasonic transmitting module receives the first instruction, the ultrasonic transmitting module determines that the ultrasonic excitation signal has a fifth frequency; when the trigger module sends and the ultrasonic transmitting module receives the second instruction, the ultrasonic transmitting module determines that the ultrasonic excitation signal has a sixth frequency, wherein the fifth frequency is less than the sixth frequency.

[0114] The frequency of the ultrasonic excitation signal is adjusted based on the different drainage intensities requested by the user. When the drainage intensity requested by the user is low, the frequency of the ultrasonic excitation signal is reduced to reduce the oscillation frequency of the oscillation unit, thereby increasing the size of the droplets atomized by the drainage member. When the drainage intensity requested by the user is high, the frequency of the ultrasonic excitation signal is increased to increase the oscillation frequency of the oscillation unit, thereby reducing the size of the droplets atomized by the drainage member.

[0115] In some embodiments, Figure 8-Figure 10The first driving voltage, the third driving voltage, and the fifth driving voltage of the ultrasonic excitation signal shown may be the same, all of which are 3-9V. In some embodiments, the driving voltage of the ultrasonic excitation signal determined based on different judgment factors may also be different. Exemplarily, when the acoustic output device is in a working state, the first driving voltage of the ultrasonic excitation signal may be 3-6V; when the volume of the liquid detected by the liquid detection sensor is less than or equal to the preset volume threshold, the third driving voltage of the ultrasonic excitation signal may be 3-8V; the fifth driving voltage of the ultrasonic excitation signal may be adapted to the user's instructions. In some embodiments, Figure 8-Figure 10 The second driving voltage, the fourth driving voltage, and the sixth driving voltage of the ultrasonic excitation signal shown may be the same, all of which are 9-15V. In some embodiments, the driving voltages of the ultrasonic excitation signal determined based on different judgment factors may also be different. Exemplarily, when the acoustic output device is in an idle state, the second driving voltage of the ultrasonic excitation signal may be 10-13V; when the volume of the liquid detected by the liquid detection sensor is greater than a preset volume threshold, the fourth driving voltage of the ultrasonic excitation signal may be 12-15V; the sixth driving voltage of the ultrasonic excitation signal may be adapted to the user instruction.

[0116] In some embodiments, Figure 8-Figure 10 The first frequency, third frequency, and fifth frequency of the ultrasonic excitation signal shown may be the same, all of which are 100 Hz-200 kHz. In some embodiments, the frequencies of the ultrasonic excitation signal determined based on different judgment factors may also be different. Exemplarily, when the acoustic output device is in a working state, the first frequency of the ultrasonic excitation signal may be 100 Hz-100 kHz; when the volume of the liquid detected by the liquid detection sensor is less than or equal to a preset volume threshold, the third frequency of the ultrasonic excitation signal may be 500 Hz-200 kHz; the fifth frequency of the ultrasonic excitation signal may be adapted to user instructions. In some embodiments, Figure 8-Figure 10 The second frequency, the fourth frequency, and the sixth frequency of the ultrasonic excitation signal shown may be the same, all of which are 1MHz-3MHz. In some embodiments, the frequencies of the ultrasonic excitation signal determined based on different judgment factors may also be different. Exemplarily, when the acoustic output device is in an idle state, the second frequency of the ultrasonic excitation signal may be 1.5MHz-2MHz; when the volume of the liquid detected by the liquid detection sensor is greater than a preset volume threshold, the fourth frequency of the ultrasonic excitation signal may be 1.5MHz-2.5MHz; the sixth frequency of the ultrasonic excitation signal may be adapted to the user instruction.

[0117] The basic concepts have been described above. Obviously, for those skilled in the art, the above detailed disclosure is only for example and does not constitute a limitation of this specification. Although not explicitly stated here, those skilled in the art may make various modifications, improvements and corrections to this specification. Such modifications, improvements and corrections are suggested in this specification, so such modifications, improvements and corrections still belong to the spirit and scope of the exemplary embodiments of this specification.

[0118] At the same time, this specification uses specific words to describe the embodiments of this specification. For example, "one embodiment", "an embodiment", and / or "some embodiments" refer to a certain feature, structure or characteristic related to at least one embodiment of this specification. Therefore, it should be emphasized and noted that "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or more in different positions in this specification does not necessarily refer to the same embodiment. In addition, certain features, structures or characteristics in one or more embodiments of this specification can be appropriately combined.

[0119] Similarly, it should be noted that in order to simplify the description disclosed in this specification and thus help understand one or more embodiments of the invention, in the above description of the embodiments of this specification, multiple features are sometimes combined into one embodiment, figure or description thereof. However, this disclosure method does not mean that the features required by the subject matter of this specification are more than the features mentioned in the claims. In fact, the features of the embodiments are less than all the features of the single embodiment disclosed above.

[0120] Finally, it should be understood that the embodiments described in this specification are only used to illustrate the principles of the embodiments of this specification. Other variations may also fall within the scope of this specification. Therefore, as an example and not a limitation, alternative configurations of the embodiments of this specification may be considered consistent with the teachings of this specification. Accordingly, the embodiments of this specification are not limited to the embodiments explicitly introduced and described in this specification.

Claims

1. An acoustic output device, characterized in that: include: case; A driving device, the driving device is accommodated in the housing, the driving device vibrates to generate sound and is output through a sound outlet hole provided on the housing; a liquid discharge member, disposed at the sound outlet; and The ultrasonic transmitting module is used to output an ultrasonic excitation signal; wherein, The liquid discharge member includes an oscillation unit and a plurality of holes, wherein the plurality of holes include a plurality of sound holes that allow sound transmission. The oscillation unit generates ultrasonic oscillations under the action of the ultrasonic excitation signal to discharge liquid at and near the sound holes.

2. The acoustic output device according to claim 1, characterized in that The diameter of the sound hole is greater than or equal to 0.1 mm.

3. The acoustic output device according to claim 1 or 2, characterized in that: The plurality of hole portions include a plurality of atomization holes. Along the thickness direction of the shell from the inside to the outside, the aperture of any of the atomization holes gradually decreases along the axial direction thereof.

4. The acoustic output device according to claim 3, characterized in that: The first opening of the atomization hole close to the outer side of the shell has a first aperture, and the first aperture is 1μm-15μm; the second opening of the atomization hole close to the inner side of the shell has a second aperture, and the ratio of the second aperture to the first aperture is 3-10.

5. The acoustic output device according to claim 3, characterized in that: The distance between any of the atomization holes and the nearest sound-through hole is 10 μm-500 μm.

6. The acoustic output device according to claim 3 or 5, characterized in that: For any of the sound-through holes, the hole closest to it is one of the several atomization holes.

7. The acoustic output device according to claim 3, characterized in that: On the liquid discharge member, the average amplitude of the region where the plurality of atomization holes are located is greater than the average amplitude of other regions.

8. The acoustic output device according to claim 3, characterized in that: The total area of ​​the atomization holes is 3.5 kμm 2 -35kμm 2 .

9. The acoustic output device according to any one of claims 1 to 3, characterized in that: A hydrophobic material is disposed on one side of the liquid discharge member close to the inside of the shell, and / or a hydrophobic material is disposed on the other side of the liquid discharge member close to the outside of the shell.

10. The acoustic output device according to claim 1, characterized in that: The oscillation unit includes a substrate layer and a piezoelectric layer partially covering the substrate layer, the plurality of holes are arranged in an area of ​​the substrate layer not covered by the piezoelectric layer, and the thickness of the substrate layer is 0.05 mm-0.15 mm; Alternatively, the oscillation unit includes a piezoelectric sheet, and the piezoelectric sheet is provided with the plurality of holes.

11. The acoustic output device according to claim 1, characterized in that: The acoustic output device also includes a liquid detection sensor, which is configured to detect liquid on the discharge member and output a detection signal; the ultrasonic transmission module is configured to output the ultrasonic excitation signal in response to the detection signal output by the liquid detection sensor.

12. The acoustic output device according to claim 11, characterized in that The ultrasonic excitation signal is related to a state of the acoustic output device.

13. The acoustic output device according to claim 12, characterized in that: When the acoustic output device is in a working state, the ultrasonic excitation signal has a first driving voltage; when the acoustic output device is in an idle state, the ultrasonic excitation signal has a second driving voltage; the first driving voltage is less than the second driving voltage.

14. The acoustic output device according to claim 12, characterized in that: When the acoustic output device is in a working state, the ultrasonic excitation signal has a first frequency; when the acoustic output device is in an idle state, the ultrasonic excitation signal has a second frequency, and the first frequency is smaller than the second frequency.

15. The acoustic output device according to claim 11, characterized in that The detection signal includes the volume of the liquid, and the ultrasonic excitation signal is related to the volume of the liquid.

16. The acoustic output device according to claim 15, characterized in that When the volume of the liquid is less than or equal to a preset volume threshold, the ultrasonic excitation signal has a third driving voltage; when the volume of the liquid is greater than the preset volume threshold, the ultrasonic excitation signal has a fourth driving voltage; the third driving voltage is less than the fourth driving voltage.

17. The acoustic output device according to claim 15, characterized in that When the volume of the liquid is less than or equal to a preset volume threshold, the ultrasonic excitation signal has a third frequency; when the volume of the liquid is greater than the preset volume threshold, the ultrasonic excitation signal has a fourth frequency, and the third frequency is less than the fourth frequency.

18. The acoustic output device according to claim 1, characterized in that The acoustic output device further includes a trigger module, which is used to receive a user instruction; the ultrasonic emission module is configured to output the ultrasonic excitation signal based on the user instruction.

19. The acoustic output device according to claim 18, characterized in that The ultrasonic excitation signal is related to the user instruction.

20. The acoustic output device of claim 19, wherein: The user instruction includes a first instruction and a second instruction. When the user instruction outputs the first instruction, the ultrasonic excitation signal has a fifth driving voltage; when the user instruction outputs the second instruction, the ultrasonic excitation signal has a sixth driving voltage; the fifth driving voltage is less than the sixth driving voltage.

21. The acoustic output device of claim 19, wherein: The user instruction includes a first instruction and a second instruction. When the user instruction outputs the first instruction, the ultrasonic excitation signal has a fifth frequency. When the user instruction outputs the second instruction, the ultrasonic excitation signal has a sixth frequency. The fifth frequency is less than the sixth frequency.

Images