A directional sound-emitting screen and auxiliary adsorption method of its vibration layer

Abstract

The present invention discloses a directional sound screen and an auxiliary adsorption method for its vibration layer. The directional sound screen includes a substrate layer (1), a vibration layer (2), and an adhesive layer (3) connected between the substrate layer (1) and the vibration layer (2). The substrate layer (1), the vibration layer (2), and the adhesive layer (3) enclose a closed cavity (4). The vibration layer (2) deforms toward the substrate layer (1) under the action of the pressure difference between the external atmospheric pressure and the air pressure in the cavity (4). By setting the vibration layer to deform toward the substrate layer under the action of the pressure difference between the external atmospheric pressure and the air pressure in the cavity, the vibration layer has an offset toward the substrate layer, and the two electrodes of the vibration layer and the substrate layer are closer, which is conducive to improving the sound pressure level of the directional sound screen. By applying a smaller bias voltage, the same or even higher sound pressure level as the existing directional sound screen can be achieved, which is more energy-efficient.

Description

Technical Field

[0001] The present invention relates to the technical field of screen sound generation, and in particular to a directional sound generation screen and an auxiliary adsorption method for its vibration layer. Background Art

[0002] A directional sound screen is a screen that emits sound in a directional manner. It consists of a base layer made of ITO glass and a vibration layer connected to the base layer. A space is provided between the base layer and the vibration layer to provide space for the vibration layer to move. Both the base layer and the vibration layer are coated with a conductive layer, which acts as a positive and negative electrode respectively. When powered, the vibration layer vibrates under the action of the AC voltage, thereby stirring the air and producing sound.

[0003] To drive the vibration layer to produce sound, a bias voltage is applied in advance to bring the two electrodes of the vibration layer and the substrate layer closer together. Then, AC current is applied to drive the vibration layer to vibrate. The closer the two electrodes are, the greater the acceleration the vibration layer experiences after the AC current is applied, and the higher the sound pressure level. Currently, the common way to increase the sound pressure level is to increase the bias voltage, which results in higher power consumption. Furthermore, a higher bias voltage places higher demands on the product's insulation performance.

[0004] Therefore, it is necessary to improve the prior art to overcome the above defects. Summary of the Invention

[0005] The object of the present invention is to provide a directional sound-emitting screen and an auxiliary adsorption method for its vibration layer, which can conveniently improve the sound pressure level of the directional sound-emitting screen.

[0006] In order to achieve the above-mentioned purpose of the invention, in the first aspect, the present invention proposes a directional sound screen, including a substrate layer, a vibration layer and an adhesive layer connected between the substrate layer and the vibration layer, the substrate layer, the vibration layer and the adhesive layer enclosed to form a closed cavity, and the vibration layer is adsorbed and deformed toward the substrate layer under the action of the pressure difference between the external atmospheric pressure and the air pressure in the cavity.

[0007] Furthermore, when the vibration layer is not adsorbed and deformed, the air pressure in the cavity is greater than or equal to 0.05 MPa and less than 0.1 MPa.

[0008] In a second aspect, the present invention provides an auxiliary adsorption method for a vibration layer of a directional sound screen, comprising the following steps:

[0009] Providing a working environment with a preset air pressure, wherein the preset air pressure is less than standard atmospheric pressure;

[0010] sealing and laminating the vibration layer and the substrate layer under the working environment;

[0011] The sealed and bonded directional sound-emitting screen is transferred to the external atmospheric pressure, and its vibration layer is adsorbed and deformed toward the substrate layer under the action of the pressure difference between the external atmospheric pressure and the air pressure in the cavity.

[0012] Furthermore, the step of sealing and laminating the vibration layer and the substrate layer under the working environment includes the following steps:

[0013] Applying adhesive on the substrate layer and / or the vibration layer, and making the applied adhesive into a closed ring shape;

[0014] Laminating the base material layer and the vibration layer;

[0015] The adhesive is cured to form a bonding layer.

[0016] Furthermore, the preset air pressure is greater than or equal to 0.05 MPa and less than 0.1 MPa.

[0017] In a third aspect, the present invention provides an auxiliary adsorption method for a vibration layer of a directional sound screen, comprising the following steps:

[0018] Providing an initial directional sound screen, the initial directional sound screen comprising a base material layer, a vibration layer, and an adhesive layer connected between the base material layer and the vibration layer, wherein the base material layer, the vibration layer, and the adhesive layer enclose a cavity;

[0019] Part of the gas in the cavity is exhausted to put the cavity in a negative pressure state.

[0020] Furthermore, the initial directional sound screen includes a through hole connecting the outside world and the cavity. In the step of discharging part of the gas in the cavity to put the cavity in a negative pressure state, part of the gas in the cavity is discharged through the through hole, and the through hole is sealed after the exhaust is completed.

[0021] Furthermore, the step of providing an initial directional sound screen includes the following steps:

[0022] providing a substrate layer and a vibration layer;

[0023] Applying adhesive on the substrate layer and / or the vibration layer, and making the applied adhesive into a ring shape with a gap;

[0024] Laminating the base material layer and the vibration layer;

[0025] The adhesive is cured to form a bonding layer, and the notch forms a through hole.

[0026] Furthermore, the cavity is evacuated through the through hole to discharge part of the gas in the cavity; or, part of the gas in the cavity is discharged by pressing the vibration layer toward the substrate layer.

[0027] In a fourth aspect, the present invention provides an auxiliary adsorption method for a vibration layer of a directional sound screen, comprising the following steps:

[0028] Providing an initial directional sound screen, the initial directional sound screen comprising a base material layer, a vibration layer, and an adhesive layer connected between the base material layer and the vibration layer, wherein the base material layer, the vibration layer, and the adhesive layer enclose a closed cavity;

[0029] A through hole is provided on the initial directional sound-emitting screen to connect the cavity with the outside world;

[0030] Part of the gas in the cavity is discharged through the through hole, and the through hole is sealed after the exhaust is completed.

[0031] Compared to existing technologies, the present invention offers the following advantages: by configuring the vibration layer to deform toward the substrate layer under the pressure differential between the external atmospheric pressure and the air pressure within the cavity, the vibration layer is offset toward the substrate layer, bringing the two electrodes closer together. This helps improve the sound pressure level of the directional sound screen. By applying a smaller bias voltage, the sound pressure level can be achieved at the same or even higher levels as existing directional sound screens, resulting in greater energy efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a cross-sectional view of a directional sound screen according to an embodiment of the present invention.

[0033] Figure 2 This is a top view of a directional sound-emitting screen according to an embodiment of the present invention. The directional sound-emitting screen in the figure is rectangular.

[0034] Figure 3 This is a top view of a directional sound-emitting screen according to an embodiment of the present invention, in which the directional sound-emitting screen is circular.

[0035] Figure 4 This is a flow chart of an auxiliary adsorption method for a vibration layer of a directional sound screen according to an embodiment of the present invention.

[0036] Figure 5 It is a flow chart of step A2 in the present invention.

[0037] Figure 6 This is a flow chart of an auxiliary adsorption method for a vibration layer of a directional sound screen according to an embodiment of the present invention.

[0038] Figure 7 It is a flow chart of step B1 in the present invention.

[0039] Figure 8 Schematic diagram of an adhesive layer with through holes according to an embodiment of the present invention.

[0040] Figure 9 This is a flow chart of an auxiliary adsorption method for a vibration layer of a directional sound screen according to an embodiment of the present invention.

[0041] Figure 10 It is a flow chart of step C1 in the present invention.

[0042] Figure 11 It is a cross-sectional view of an initial directional sound-emitting screen with through holes according to an embodiment of the present invention. DETAILED DESCRIPTION

[0043] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. It will be understood that the specific embodiments described herein are only used to explain the present application, rather than to limit the present application. It should also be noted that, for ease of description, only some, rather than all, structures related to the present application are shown in the accompanying drawings. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0044] As used herein, the terms "comprise," "comprising," and "having," and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus comprising a series of steps or elements is not limited to the listed steps or elements but may optionally include steps or elements not listed, or may optionally include other steps or elements inherent to the process, method, product, or apparatus.

[0045] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0046] The present invention proposes a directional sound screen, such as Figure 1 As shown, the directional sound screen includes a base material layer 1 , a vibration layer 2 and an adhesive layer 3 connected between the base material layer 1 and the vibration layer 2 .

[0047] The substrate layer 1 is usually made of a transparent material, such as ITO conductive glass. The vibration layer 2 is made of, for example, PET (polyethylene terephthalate), which vibrates and produces sound under the action of an ultrasonic signal.

[0048] The bonding layer 3 is used to connect the substrate layer 1 and the vibration layer 2. The bonding layer 3 is annular, and its specific shape is not limited. For example, in some embodiments, reference Figure 2 , Figure 2 The dotted line shows the rectangular ring-shaped adhesive layer 3. In other embodiments, Figure 3 , Figure 3 The dotted line in the figure indicates the circular bonding layer 3. Preferably, the bonding layer 3 has the same shape as the base material layer 1 and the vibration layer 2. The bonding layer 3 may be made of an OCR adhesive layer, for example.

[0049] The base layer 1, vibration layer 2, and adhesive layer 3 enclose a sealed cavity 4, and the vibration layer 2 deforms toward the base layer 1 due to the pressure difference between the external atmospheric pressure and the air pressure within the cavity 4. In other words, when the vibration layer 2 is not deformed, the air pressure within the cavity 4 is lower than the external atmospheric pressure, which is typically standard atmospheric pressure (0.1 MPa). This external atmospheric pressure exerts pressure on the surface of the vibration layer 2, driving the vibration layer 2 to deform toward the base layer 1, resulting in a more uniform deformation.

[0050] It can be understood that when the vibration layer 2 is adsorbed toward the substrate layer 1, the distance between the vibration layer 2 and the substrate layer 1 decreases, and the distance between the two electrodes of the vibration layer 2 and the substrate layer 1 becomes closer. This helps to increase the amplitude of the vibration layer 2 after the alternating current is passed through the substrate layer 1, thereby improving the sound pressure level of the directional sound screen. Even with a smaller bias voltage than that of existing directional sound screens, the same or even higher sound pressure level can be achieved, which is more energy-efficient.

[0051] For example, when the existing directional sound screen uses a bias voltage of 300V, the vibration layer 2 moves downward by a distance of 4 to 5μm (the downward distance here refers to the distance between the lowest point of the vibration layer 2 and its starting point). However, in the directional sound screen of the present invention, the vibration layer 2 has a certain downward movement with the assistance of negative pressure, for example, it moves downward by 2.5μm. In this way, it only needs to load a bias voltage smaller than 300V, such as 200V, and the vibration layer 2 can move downward by 5μm. In other words, the same sound pressure level as before can be achieved with a small voltage, power consumption is reduced, product safety performance is improved, and insulation requirements are also reduced, which can reduce the thickness of the insulation layer, thereby reducing the overall cost of the product and the amount of raw materials used. Furthermore, after the directional sound screen of the present invention is loaded with a bias voltage of 300V, the vibration layer 2 can move downward by more than 5μm, for example, 5.5μm. In this way, the two electrodes are closer together, and when alternating current is applied, the amplitude that the vibration layer 2 can obtain is larger, and the sound pressure level can be increased.

[0052] In some embodiments, when the vibration layer 2 is not adsorbed, the air pressure within the cavity 4 is greater than or equal to 0.05 MPa and less than 0.1 MPa. Thus, under the action of standard atmospheric pressure, the vibration layer 2 can move closer to the substrate layer 1 without getting too close due to excessively low air pressure, thereby ensuring its operational reliability and stability. Further preferably, when the vibration layer 2 is not deformed and adsorbed, the air pressure within the cavity 4 is greater than or equal to 0.06 MPa and less than or equal to 0.09 MPa. Under these air pressure conditions, the deformation of the vibration layer 2 is more reasonable, which is conducive to ensuring sound quality.

[0053] In some embodiments, the deformation amount of the vibration layer 2 is 0.5 μm to 6 μm, preferably 5 μm downward. The deformation amount refers to the distance between the lowest point of the vibration layer 2 after deformation and the position of the same point before deformation.

[0054] The shape of the directional sound screen is not limited, for example, it can be rectangular, circular or other shapes. Figure 2 and Figure 3 A rectangular and circular directional sound screen are shown, respectively. The shapes of the substrate layer 1 and the vibration layer 2 are the same as those of the directional sound screen. In some embodiments, the bonding layer 3 is disposed at the outer edges of the substrate layer 1 and the vibration layer 2. In this case, its shape is adapted to the shapes of the substrate layer 1 and the vibration layer 2, and its outer contour coincides with the outer contours of the substrate layer 1 and the vibration layer 2. For example, when the substrate layer 1 and the vibration layer 2 are circular, the bonding layer 3 is annular; for another example, when the substrate layer 1 and the vibration layer 2 are rectangular, the bonding layer 3 is rectangular.

[0055] The present invention also proposes several methods to assist the adsorption of the vibration layer, as detailed below.

[0056] The auxiliary adsorption method of the vibration layer of the first directional sound screen proposed by the present invention is as follows: Figure 4 As shown, it includes the following steps:

[0057] A1. Provide a working environment with a preset air pressure, wherein the preset air pressure is less than the standard atmospheric pressure;

[0058] A2. The vibration layer 2 and the base layer 1 are sealed together under the working environment, preferably the frame of the two is sealed together;

[0059] A3. The sealed and bonded directional sound-emitting screen is transferred to the external atmospheric pressure. The vibration layer 2 is adsorbed and deformed toward the substrate layer 1 under the action of the pressure difference between the external atmospheric pressure and the air pressure in the cavity 4 .

[0060] It can be understood that because the vibration layer and substrate layer are bonded together in an operating environment with an air pressure lower than standard atmospheric pressure, the air pressure within the cavity 4 of the resulting directional sound screen is the same as the operating environment, that is, lower than standard atmospheric pressure. When the directional sound screen is transferred to an environment with normal atmospheric pressure, its vibration layer 2 will be attracted and deformed toward the substrate layer 1 under the influence of the external atmospheric pressure.

[0061] In step A2, the vibration layer 2 and the substrate layer 1 are sealed and bonded in various ways, for example, the following method can be used (refer to Figure 5 ):

[0062] A20. An adhesive is applied to the substrate layer 1 and / or the vibration layer 2, and the applied adhesive is shaped like a closed ring;

[0063] A21. Laminating the substrate layer 1 and the vibration layer 2;

[0064] A22. Curing the adhesive to form a bonding layer 3.

[0065] In the above steps, the preset air pressure is greater than or equal to 0.05 MPa and less than 0.1 MPa. After the directional sound screen is prepared in step A2, the air pressure of the cavity 4 formed between the substrate layer 1, the vibration layer 2 and the bonding layer 3 is substantially the same as the preset air pressure. Further preferably, the preset air pressure is greater than or equal to 0.06 MPa and less than or equal to 0.09 MPa. In some embodiments, the working environment with the preset air pressure is provided by a negative pressure environment box. Preferably, the step of sealing and laminating the vibration layer and the substrate layer is automatically completed by automated equipment to facilitate working in a negative pressure environment.

[0066] In step A20, adhesive can be applied along a circular path on substrate layer 1 and / or vibration layer 2 using a dispensing machine to form a closed loop of adhesive. When adhesive is applied to both substrate layer 1 and vibration layer 2 simultaneously, the positions and sizes of the adhesive on substrate layer 1 and vibration layer 2 must match.

[0067] In step A21, when laminating the substrate layer 1 and the vibration layer 2, precise alignment is required to ensure the quality of the product after lamination.

[0068] In step A22, the adhesive may be cured by natural curing, curing by drying in an environmental chamber, or UV curing, depending on the type of the adhesive.

[0069] The auxiliary adsorption method of the vibration layer of the second directional sound screen proposed by the present invention is as follows: Figure 6 As shown, it includes the following steps:

[0070] B1. Providing an initial directional sound screen, which is an intermediate product of the final directional sound screen, comprising a substrate layer 1, a vibration layer 2, and an adhesive layer 3 connected between the substrate layer 1 and the vibration layer 2. The substrate layer 1, the vibration layer 2, and the adhesive layer 3 enclose a cavity 4;

[0071] B2. Expel part of the gas in the cavity 4 to put the cavity 4 in a negative pressure state.

[0072] The second method for assisting the adsorption of the vibration layer of a directional sound screen proposed in this invention can be performed under normal atmospheric pressure. In some embodiments, the initial directional sound screen includes a through hole 30 connecting the outside world with the cavity 4. One or more through holes 30 can be provided in one or more of the substrate layer 1, the vibration layer 2, and the adhesive layer 3. In step B2, some of the gas within the cavity 4 is exhausted through the through hole 30. After the exhaust is completed, the through hole 30 is sealed to achieve negative pressure adsorption of the vibration layer 2.

[0073] In step B1, there are multiple steps for providing an initial directional sound screen. As a preferred embodiment, for example, Figure 7 As shown, the step of providing an initial directional sound screen includes the following steps:

[0074] B10 provides a substrate layer 1 and a vibration layer 2;

[0075] B11. Applying an adhesive to the substrate layer 1 and / or the vibration layer 2, and forming the applied adhesive into a ring having a gap;

[0076] B12. Laminating the substrate layer 1 and the vibration layer 2;

[0077] B13. Curing the adhesive, the adhesive is cured to form a bonding layer 3, the notch forming a through hole 30, see Figure 8 .

[0078] In step B11, adhesive can be applied along a circular path onto substrate layer 1 and / or vibration layer 2 using a dispensing machine or manually, leaving a gap. When applying adhesive to both substrate layer 1 and vibration layer 2 simultaneously, the position and size of the adhesive on each layer must match.

[0079] In step B13, the adhesive can be cured by natural curing, drying in an environmental chamber, or UV curing, depending on the adhesive type. After curing, a bonding layer 3 with through-holes 30 is formed. Through through-holes 30, the gas within cavity 4 is exhausted, reducing the pressure within cavity 4 to less than the external atmospheric pressure, thereby causing the vibration layer 2 to deform toward the substrate layer 1.

[0080] In some embodiments, the cavity 4 is evacuated through the through hole 30 to discharge some of the gas in the cavity 4. For example, a negative pressure generator can be connected to a needle-shaped or tubular evacuation head through an air path to evacuate the cavity 4 to reduce the air pressure in the cavity 4. After the evacuation is completed, glue is dispensed at the evacuation hole 30 while the evacuation head is removed, thereby quickly sealing the evacuation hole 30 and reducing the entry of external gas into the cavity 4.

[0081] In some embodiments, the gas within cavity 4 is partially expelled by pressing vibration layer 2 against substrate layer 1. For example, a lifting mechanism can be used to drive a pressing plate downward to press vibration layer 2, thereby reducing the volume of cavity 4 and allowing the gas within cavity 4 to be expelled through through-hole 30. The distance the pressing plate presses downward can be considered the deformation of vibration layer 2. When the pressing plate presses downward to a predetermined distance, through-hole 30 is sealed by dispensing glue, maintaining the current state of vibration layer 2.

[0082] As a preferred embodiment, when the vibration layer 2 of the directional sound screen produced in step B2 is not deformed, the air pressure within cavity 4 is greater than or equal to 0.05 MPa and less than or equal to 0.1 MPa. Further preferably, the air pressure within cavity 4 is greater than or equal to 0.06 MPa and less than or equal to 0.09 MPa. Obviously, the air pressure can be adjusted by controlling the amount of discharged gas.

[0083] The auxiliary adsorption method of the vibration layer of the third directional sound screen proposed by the present invention is as follows: Figure 9 As shown, it includes the following steps:

[0084] C1. Providing an initial directional sound screen, the initial directional sound screen comprising a substrate layer 1, a vibration layer 2, and an adhesive layer 3 connected between the substrate layer 1 and the vibration layer 2, the substrate layer 1, the vibration layer 2, and the adhesive layer 3 enclosing a sealed cavity 4;

[0085] C2. A through hole 30 is provided on the adhesive layer 3, connecting the cavity 4 and the outside;

[0086] C3. Exhaust part of the gas in the cavity 4 through the through hole 30 and seal the through hole 30 after the exhaust is completed.

[0087] In the third method for assisting the adsorption of the vibration layer of the directional sound screen, the air pressure within cavity 4 is greater than a preset pressure, and the preset pressure is reached by exhausting gas. In some embodiments, the preset pressure is greater than or equal to 0.05 MPa and less than 0.1 MPa. More preferably, the preset pressure is greater than or equal to 0.06 MPa and less than or equal to 0.09 MPa.

[0088] The initial directional sound screen provided in step C1 can be directly produced by conventional processes under normal pressure, and the air pressure in the cavity 4 is consistent with the standard atmospheric pressure. Figure 10 As shown, the step of providing a directional sound screen in step C1 includes the following steps:

[0089] C10 provides a substrate layer 1 and a vibration layer 2;

[0090] C11. Applying an adhesive to the substrate layer 1 and / or the vibration layer 2 so that the applied adhesive has a ring shape;

[0091] C12. Laminating the substrate layer 1 and the vibration layer 2;

[0092] C13. Curing the adhesive to form a bonding layer 3.

[0093] In step C11 , the adhesive may be applied by automatic dispensing equipment or by manual coating.

[0094] In step C13, the adhesive may be cured by natural curing, curing by drying in an environmental chamber, or UV curing, depending on the type of the adhesive.

[0095] In step C2, a through hole 30 can be opened on the adhesive layer 3 by chemical etching, mechanical drilling or laser drilling, for example. Figure 11 As shown, the through hole 30 communicates from the outer peripheral surface of the adhesive layer 3 to the cavity 4 .

[0096] The method of discharging part of the gas in the cavity 4 can refer to the relevant method in the auxiliary adsorption method of the vibration layer of the second directional sound screen.

[0097] For example, in some embodiments, the cavity 4 is evacuated through the through hole 30 to discharge some of the gas in the cavity 4. For example, a negative pressure generator can be connected to a needle-shaped or tubular evacuation head through an air path to evacuate the cavity 4 to reduce the air pressure in the cavity 4. After the evacuation is completed, glue is dispensed at the evacuation hole 30 while the evacuation head is removed, thereby quickly sealing the through hole 30 and reducing the entry of external gas into the cavity 4.

[0098] In other embodiments, the gas within cavity 4 is partially expelled by pressing vibration layer 2 against substrate layer 1. For example, a lifting mechanism can be used to drive a pressing plate to press down on vibration layer 2, thereby reducing the volume of cavity 4 and allowing the gas within cavity 4 to be expelled through through-hole 30. The distance the pressing plate presses down can be considered the deformation of vibration layer 2. When the pressing plate presses down to a predetermined distance, through-hole 30 is sealed by dispensing glue, maintaining the current state of vibration layer 2.

[0099] As a preferred embodiment, when the vibration layer 2 of the directional sound screen produced after step C3 is not deformed, the air pressure within cavity 4 is greater than or equal to 0.05 MPa and less than or equal to 0.1 MPa. Further preferably, the air pressure within cavity 4 is greater than or equal to 0.06 MPa and less than or equal to 0.09 MPa. Obviously, the air pressure can be adjusted by controlling the amount of gas discharged.

[0100] The above is only a specific embodiment of the present invention, and any other improvements made based on the concept of the present invention are considered to be within the protection scope of the present invention.

Claims

1. A directional sound screen, characterized in that: The invention comprises a substrate layer (1), a vibration layer (2) and an adhesive layer (3) connected between the substrate layer (1) and the vibration layer (2); the substrate layer (1), the vibration layer (2) and the adhesive layer (3) enclose a closed cavity (4); before the bias voltage is loaded on the directional sound-emitting screen, the vibration layer (2) is adsorbed and deformed toward the substrate layer (1) under the action of the pressure difference between the external atmospheric pressure and the air pressure in the cavity (4), thereby reducing the distance between the vibration layer (2) and the substrate layer (1), so that after the alternating current is passed through, the amplitude of the vibration layer (2) is increased.

2. The directional sound screen according to claim 1, characterized in that: When the vibration layer (2) is not deformed by adsorption, the air pressure in the cavity (4) is greater than or equal to 0.05 MPa and less than 0.1 MPa.

3. An auxiliary adsorption method for the vibration layer of the directional sound screen according to claim 1, characterized in that The steps include: Providing a working environment with a preset air pressure, wherein the preset air pressure is less than standard atmospheric pressure; sealing and laminating the vibration layer (2) and the base material layer (1) under the working environment; The sealed and bonded directional sound-emitting screen is transferred to the external atmospheric pressure, and its vibration layer (2) is adsorbed and deformed toward the substrate layer (1) under the action of the pressure difference between the external atmospheric pressure and the air pressure in the cavity (4).

4. The auxiliary adsorption method for the vibration layer of the directional sound screen according to claim 3, characterized in that: The process of sealing and laminating the vibration layer (2) and the substrate layer (1) under the working environment comprises the following steps: Applying adhesive on the substrate layer (1) and / or the vibration layer (2), and making the applied adhesive into a closed ring shape; Laminating the substrate layer (1) and the vibration layer (2); The adhesive is cured to form a bonding layer (3).

5. The auxiliary adsorption method for the vibration layer of the directional sound screen according to claim 3 or 4, characterized in that: The preset air pressure is greater than or equal to 0.05 MPa and less than 0.1 MPa.

6. A method for assisting adsorption of the vibration layer of a directional sound screen, characterized in that The steps include: An initial directional sound-emitting screen is provided, the initial directional sound-emitting screen comprising a base material layer (1), a vibration layer (2), and an adhesive layer (3) connected between the base material layer (1) and the vibration layer (2), wherein the base material layer (1), the vibration layer (2), and the adhesive layer (3) enclose a cavity (4); Part of the gas in the cavity (4) is exhausted to place the cavity (4) in a negative pressure state. Before the directional sound-emitting screen is loaded with a bias voltage, the vibration layer (2) is adsorbed and deformed toward the substrate layer (1) under the action of the pressure difference between the external atmospheric pressure and the air pressure in the cavity (4), thereby reducing the distance between the vibration layer (2) and the substrate layer (1), so that the amplitude of the vibration layer (2) is increased after the alternating current is passed.

7. The auxiliary adsorption method for the vibration layer of the directional sound screen according to claim 6, characterized in that: The initial directional sound-emitting screen comprises a through hole (30) connecting the outside with the cavity (4); in the step of exhausting part of the gas in the cavity (4) to place the cavity (4) in a negative pressure state, part of the gas in the cavity (4) is exhausted through the through hole (30), and the through hole (30) is sealed after the exhaust is completed.

8. The auxiliary adsorption method for the vibration layer of the directional sound screen according to claim 6, characterized in that: The step of providing an initial directional sound screen comprises the following steps: Providing a substrate layer (1) and a vibration layer (2); Applying adhesive on the substrate layer (1) and / or the vibration layer (2), and making the applied adhesive into a ring shape with a gap; Laminating the substrate layer (1) and the vibration layer (2); The adhesive is cured to form a bonding layer (3), and the notch forms a through hole (30).

9. The auxiliary adsorption method for the vibration layer of the directional sound screen according to claim 7 or 8, characterized in that: The cavity (4) is evacuated through the through hole (30) to discharge part of the gas in the cavity (4); or, part of the gas in the cavity (4) is discharged by pressing the vibration layer (2) toward the substrate layer (1).

10. A method for assisting adsorption of the vibration layer of a directional sound screen, characterized in that The steps include: An initial directional sound-emitting screen is provided, the initial directional sound-emitting screen comprising a base material layer (1), a vibration layer (2), and an adhesive layer (3) connected between the base material layer (1) and the vibration layer (2), wherein the base material layer (1), the vibration layer (2), and the adhesive layer (3) enclose a closed cavity (4); A through hole (30) is provided on the initial directional sound-emitting screen, connecting the cavity (4) and the outside world; Part of the gas in the cavity (4) is discharged through the through hole (30), and the through hole (30) is sealed after the exhaust is completed, so that before the bias voltage is loaded on the directional sound screen, the vibration layer (2) is adsorbed and deformed toward the substrate layer (1) under the action of the pressure difference between the external atmospheric pressure and the air pressure in the cavity (4), thereby reducing the distance between the vibration layer (2) and the substrate layer (1), so that the amplitude of the vibration layer (2) is increased after the alternating current is passed.

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