Negative pressure curtain for optical projection

Abstract

The embodiment of the invention provides a negative pressure curtain for optical projection, which comprises an inner layer curtain, an outer layer curtain and an outer structure layer which are sequentially arranged from inside to outside, the outer layer curtain is provided with a sound transmission hole, the outer structure layer is provided with a sound cavity corresponding to the sound transmission hole, the sound cavity is provided with an opening facing the sound transmission hole, and the opening faces the sound transmission hole. The sound box cavity is provided with an opening, the opening is connected with the sound transmission hole in a sealed mode, the sound box cavity is used for arranging a sound box, the inner-layer curtain is of a woven fabric structure and is provided with a first area and a second area, the first area corresponds to the sound transmission hole, and the second area corresponds to the sound transmission hole. The weaving gap of the first area is larger than that of the second area. According to the negative pressure curtain for optical projection provided by the embodiment of the invention, sound can better penetrate through the outer-layer curtain and the inner-layer curtain of the negative pressure curtain for optical projection, and better experience is brought.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of optical technology, and in particular to a negative pressure screen for optical projection. Background Art

[0002] With the rapid development of the national economy, people's living standards are constantly improving, and people's demand for recreational activities is becoming more and more vigorous. Under this situation, along with the development of the amusement industry, arc screen theaters, ball screen theaters and even capsule screen theaters have emerged. However, with the prosperity of these theaters, the high cost makes some investors sigh. With the iteration of the market, small ball screen capsule screens came into being. This small ball screen capsule screen usually uses a negative pressure screen for optical projection. This negative pressure screen for optical projection is a soft screen, and has the characteristics of low cost and easy construction, but the disadvantages are also relatively obvious. The projector and speakers can only be arranged outside the baseline of the screen, and it is impossible to give the audience a real sound immersion experience.

[0003] 5.1 channel sound system or 7.1 channel sound system, or even panoramic sound field system, need to be deployed at multiple points on the capsule screen and the ball screen to ensure the effect of the sound field. The outer layer of the negative pressure screen for optical projection on the market is mostly made of PVC coated cloth, which has extremely poor sound transmittance. After the sound passes through the outer layer of the curtain and enters the structural frame, the sound will spread randomly in this cavity, resulting in sound confusion. The inner layer of the negative pressure curtain for optical projection has a higher sound insulation property because it requires negative pressure. Therefore, the sound of the speakers arranged outside the negative pressure curtain for optical projection will be reduced and become turbid after entering the negative pressure capsule curtain and the ball screen, resulting in a worse sound field effect. Summary of the invention

[0004] In view of this, an embodiment of the present application provides a negative pressure screen for optical projection, which can enable sound to better penetrate the outer screen and the inner screen of the negative pressure screen for optical projection, thereby bringing a better experience.

[0005] According to an embodiment of the present application, a negative pressure curtain for optical projection is provided, comprising an inner curtain, an outer curtain and an outer structural layer arranged in sequence from the inside to the outside, the outer curtain is connected to the inner curtain, and negative pressure is formed between the outer curtain and the inner curtain through a negative pressure device, the outer curtain is provided with sound holes, the outer structural layer has a sound cavity corresponding to the sound holes, the sound cavity has an open opening facing the sound holes, and the open opening is sealed and connected to the sound holes, the sound cavity is used to set up sound, the inner curtain is a woven structure, the inner curtain has a first area and a second area, the first area corresponds to the sound holes, and the woven gap in the first area is larger than the woven gap in the second area.

[0006] Optionally, the negative pressure screen for optical projection further comprises a structural frame, wherein the structural frame is located between the inner layer curtain cloth and the outer layer curtain cloth, and the structural frame is detachably connected by a plurality of connecting rods.

[0007] Optionally, the open mouth of the sound cavity is connected to the sound-permeable hole by means of a sealant.

[0008] Optionally, a first clamping portion is provided at the open mouth of the sound cavity, and a second clamping portion is provided at the sound-permeable hole, the first clamping portion and the second clamping portion are clamped and connected, and the outside of the first clamping portion and the second clamping portion are both covered with a sealing layer.

[0009] Optionally, the wall of the acoustic cavity facing outwards can open or close the acoustic cavity.

[0010] Optionally, a sound insulation layer is provided on the inner wall surface of the sound cavity.

[0011] Optionally, the elasticity of the first region is greater than the elasticity of the second region.

[0012] Optionally, the outer structural layer further includes a matching portion, and the matching portion is detachably connected to the sound cavity.

[0013] Optionally, the outer structural layer is made of waterproof and anti-corrosion material.

[0014] Optionally, the first area of ​​the inner layer curtain can adjust its fabric gap according to the pressure in the negative pressure curtain for optical projection.

[0015] According to the negative pressure screen for optical projection provided by the embodiment of the present application, negative pressure is formed between the outer layer of the screen and the inner layer of the screen, which prevents the inner layer of the screen from collapsing, and can ensure the stability of the overall structural morphology of the negative pressure screen for optical projection. The outer layer of the outer layer of the screen is provided with an outer structural layer having an acoustic cavity, and the outer layer of the screen is provided with a sound-permeable hole corresponding to the position of the acoustic cavity, so that the sound of the sound in the acoustic cavity can be transmitted through the sound-permeable hole into the space between the outer layer of the screen and the inner layer of the screen. At the same time, the acoustic cavity has an open mouth facing the sound-permeable hole, so that the sound transmission of the sound can be more directional, preventing the random propagation of the sound and causing the confusion of the sound. The inner layer of the screen adopts a woven structure, so the sound of the sound can pass through the woven gap in the first area. And the woven gap in the first area corresponding to the inner layer of the screen and the sound-permeable hole is larger than the woven gap in the second area, so the sound of the sound has a higher sound transmittance in the first area. Thereby, the sound of the external sound passes through the outer layer of the screen and the inner layer of the screen, and the transmittance of the sound of the sound is improved by increasing the woven gap in the first area. It not only realizes the structural form of the negative pressure screen for optical projection, but also improves the sound transmission of the negative pressure screen for optical projection, which can bring the audience a more realistic sound immersion experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the embodiments of the present application. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0017] Figure 1 It is a schematic diagram of the cross-sectional structure of a negative pressure curtain for optical projection; Figure 2 is a schematic cross-sectional structure diagram of a negative pressure screen for optical projection according to an embodiment of the present application; Figure 3 for Figure 2 A partial enlarged view of point A in the middle.

[0018] Description of reference numerals: Negative pressure screen 100 for optical projection; Inner curtain 10; Outer curtain 20; sound-permeable holes 201; Outer structure layer 30; sound cavity 301; open mouth 3011; sound insulation layer 302; matching part 303; Structural frame 40; Speakers 200. DETAILED DESCRIPTION

[0019] In order to enable those skilled in the art to better understand the technical solutions in the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the embodiments of the present application should fall within the scope of protection of the embodiments of the present application.

[0020] As mentioned before, with the rapid development of the national economy, people's living standards are constantly improving, and people's demand for recreational activities is becoming more and more vigorous. Under this situation, along with the development of the amusement industry, arc screen theaters, spherical screen theaters and even capsule screen theaters have emerged. However, with the prosperity of these theaters, the high cost makes some investors sigh. With the iteration of the market, small spherical screen capsule screens came into being. Figure 1 As shown, this small ball screen capsule screen usually adopts a negative pressure screen for optical projection. This negative pressure screen for optical projection is a soft screen, and has the characteristics of low cost and easy construction, but the disadvantages are also relatively obvious. The projector and speakers can only be arranged outside the baseline of the screen, and the audience cannot be given a real sound immersion experience.

[0021] 5.1 channel sound system or 7.1 channel sound system, or even panoramic sound field system needs to be deployed at multiple points on the capsule screen and the ball screen to ensure the sound field effect. Figure 1 As shown, the outer layer of the negative pressure screen for optical projection on the market mostly uses PVC coated cloth, which has very poor sound transmittance. After the sound passes through the outer layer of the screen 20, it enters the structural frame 40, and the sound will spread randomly in this cavity, resulting in sound confusion. However, the inner layer of the negative pressure screen for optical projection 10 has a higher sound insulation property because it requires negative pressure. Therefore, the sound of the speakers arranged outside the negative pressure screen for optical projection will be reduced and become turbid after entering the negative pressure capsule screen and the ball screen, resulting in a poor sound field effect.

[0022] Therefore, if Figure 2 and Figure 3 As shown, a negative pressure screen 100 for optical projection according to an embodiment of the present application can not only realize the negative pressure structure of the negative pressure screen 100 for optical projection, but also enable the sound of the speaker 200 to penetrate the outer screen 20 and the inner screen 10, thereby bringing a better user experience.

[0023] The following is attached to the instruction manual Figure 2 and Figure 3 A negative pressure screen 100 for optical projection according to an embodiment of the present application is described in detail.

[0024] According to the present invention, a negative pressure screen 100 for optical projection is provided. Figure 2 As shown, it includes an inner curtain layer 10, an outer curtain layer 20 and an outer structural layer 30 which are arranged in sequence from the inside to the outside.

[0025] It should be noted here that the negative pressure screen 100 for optical projection is a kind of medium which is sealed by two layers of sealing materials, namely the inner screen 10 and the outer screen 20, and the structure is supported by the structural frame 40, and then the inner screen 10 is formed into an inner layer of a predetermined shape screen by vacuuming, which is used for projecting and forming images.

[0026] like Figure 2 As shown, in the negative pressure screen 100 for optical projection of the embodiment of the invention, the outer screen 20 is connected to the inner screen 10, and a negative pressure device is used to form a negative pressure between the outer screen 20 and the inner screen 10, thereby forming a stable structural shape with the inner screen 10 and the outer screen 20 of the negative pressure screen 100 for optical projection, thereby ensuring the viewing quality of the audience after the image is projected on the inner screen 10 of the negative pressure screen 100 for optical projection.

[0027] Among them, Figure 3As shown, the outer curtain 20 is provided with a sound-transmitting hole 201, and the outer structural layer 30 has an acoustic cavity 301 corresponding to the sound-transmitting hole 201, and the acoustic cavity 301 is used to set the acoustic 200. The acoustic cavity 301 can provide a stable and protective installation space for the acoustic 200 to protect the acoustic 200. Compared with the form of placing the acoustic 200 outside the outer curtain 20 of the negative pressure curtain 100 for optical projection, the acoustic 200 can be prevented from being damaged. In addition, the acoustic cavity 301 corresponds to the position of the sound-transmitting hole 201, so that the sound generated by the acoustic 200 can be transmitted from the sound-transmitting hole 201 through the outer curtain 20 to the inner curtain 10.

[0028] like Figure 3 As shown, the sound cavity 301 has an open mouth 3011 facing the sound-transmitting hole 201, and the open mouth 3011 is sealed and connected to the sound-transmitting hole 201. Therefore, the sound of the sound 200 is transmitted through the open mouth 3011, which can make the transmission of the sound directional and prevent the sound transmission direction from being random, resulting in unclear sound. In addition, the open mouth 3011 of the sound cavity 301 is sealed and connected to the sound-transmitting hole 201, which can ensure the sound transmission while preventing the negative pressure screen 100 for optical projection from having a poor vacuum effect due to sealing problems, thereby causing the inner layer of the screen 10 to collapse and reduce the audience's viewing experience.

[0029] Furthermore, the inner curtain 10 is an inner curtain 10 of a woven structure. Specifically, the inner curtain 10 adopts a woven structure so that the inner curtain 10 has gaps, which can facilitate the sound of the speaker 200 to penetrate. And. The inner curtain 10 has a first area and a second area, the first area corresponds to the sound-permeable hole 201, and the woven gap of the first area is larger than the woven gap of the second area. Therefore, relative to the second area, the sound transmittance of the first area is higher. It can be seen that after the sound of the speaker 200 passes through the sound-permeable hole 201, it can continue to be transmitted to the inside of the negative pressure curtain 100 for optical projection through the woven gap of the first area, ensuring that the sound is stably transmitted to the inside of the negative pressure curtain 100 for optical projection, and enhancing the sound immersion experience of the audience inside the negative pressure curtain 100 for optical projection.

[0030] According to the negative pressure curtain 100 for optical projection provided by the embodiment of the present application, negative pressure is formed between the outer curtain 20 and the inner curtain 10 to prevent the inner curtain 10 from collapsing, and the overall structural morphology of the negative pressure curtain 100 for optical projection can be ensured to be stable. The outer structure layer 30 having an acoustic cavity 301 is provided on the outside of the outer curtain 20, and the outer curtain 20 is provided with a sound-permeable hole 201 corresponding to the position of the acoustic cavity 301, thereby allowing the sound of the acoustic 200 in the acoustic cavity 301 to be transmitted through the sound-permeable hole 201 into between the outer curtain 20 and the inner curtain 10. At the same time, the acoustic cavity 301 has an open mouth 3011 facing the sound-permeable hole 201, so that the sound transmission of the acoustic 200 can be more directional, preventing the sound from being propagated randomly and causing confusion of the sound. The inner curtain 10 adopts a woven structure, so the sound of the acoustic 200 can pass through the woven gap in the first area. Furthermore, the fabric gap in the first area corresponding to the inner curtain 10 and the sound-permeable hole 201 is larger than the fabric gap in the second area, so the sound of the sound of the speaker 200 has a higher sound permeability in the first area. Thus, the sound of the external speaker 200 can pass through the outer curtain 20 and the inner curtain 10, and the sound permeability of the speaker 200 is improved by increasing the fabric gap in the first area. This not only realizes the structural form of the negative pressure curtain 100 for optical projection, but also improves the sound permeability of the negative pressure curtain 100 for optical projection, which can bring the audience a more realistic sound immersion experience.

[0031] like Figure 3 As shown, the negative pressure screen 100 for optical projection further includes a structural frame 40, and the structural frame 40 is located between the inner layer curtain 10 and the outer layer curtain 20, and the structural frame 40 is detachably connected by a plurality of connecting rods. Specifically, when the negative pressure screen 100 for optical projection shapes the inner layer curtain 10 and the outer layer curtain 20 by negative pressure, the outer layer curtain 20 can be attached to the outer surface of the structural frame 40, that is, the structural frame 40 can prop up the outer layer curtain 20, and after vacuuming between the inner layer curtain 10 and the outer layer curtain 20 of the negative pressure screen 100 for optical projection, the inner layer curtain 10 can be propped up along the shape of the structural frame 40, so that the inner layer curtain 10 can be projected. It should be noted that, as Figure 2 As shown, there is a gap between the inner curtain 10 and the structural frame 40, and between the structural frame 40 and the outer curtain 20. In other words, the inner curtain 10 is not directly attached to the structural frame 40.

[0032] Meanwhile, the structural frame 40 adopts a structure of multiple detachable connecting rods, which can be easily assembled and disassembled. After disassembly, it is convenient to carry the negative pressure screen 100 for optical projection as a whole.

[0033] In some embodiments of the present invention, the open mouth 3011 of the sound cavity 301 is connected to the sound-permeable hole 201 by a sealant. Negative pressure needs to be maintained between the inner layer curtain 10 and the outer layer curtain 20 of the negative pressure curtain 100 for optical projection, so the inner layer curtain 10 and the outer layer curtain 20 need to be sealed to ensure the stability of the pressure. As mentioned above, in order to facilitate the penetration of sound, the outer layer curtain 20 is provided with a sound-permeable hole 201. Therefore, in order to ensure the pressure inside the negative pressure curtain 100 for optical projection and prevent the vacuum effect from being poor, a sealed connection is required between the connection between the sound cavity 301 and the sound-permeable hole 201. The two are in the form of a sealant, which can be quickly bonded after the sound cavity 301 is connected to the negative pressure curtain 100 for optical projection, or the sealant can be cut with a tool when the sound cavity 301 needs to be removed, which is convenient and quick.

[0034] In some embodiments of the present invention, a first clamping portion is provided at the open mouth 3011 of the sound cavity 301, and a second clamping portion is provided at the sound-permeable hole 201. The first clamping portion and the second clamping portion are clamped and connected, and the outside of the first clamping portion and the second clamping portion are both covered with a sealing layer. Specifically, the outside of the first clamping portion at the open mouth 3011 of the sound cavity 301 can be covered with a sealing layer, and the outside of the second clamping portion at the sound-permeable hole 201 can be covered with a sealing layer. Therefore, after the first clamping portion and the second clamping portion are clamped, the sealing of the connection between the two is achieved by docking the sealing layers of the two. While ensuring sound penetration, the negative pressure effect of the negative pressure curtain 100 for optical projection is also guaranteed.

[0035] The sealing layer may be a sealing layer made of rubber material.

[0036] In some embodiments of the present invention, the wall of the sound cavity 301 facing the outside can open or close the sound cavity 301 .

[0037] Specifically, the sound cavity 301 can be opened and closed through the wall facing the outside, so that the sound cavity 301 can be opened conveniently and the sound 200 can be conveniently arranged inside the sound cavity 301. At the same time, it is convenient to repair and replace the sound 200 and clean the inside of the sound cavity 301.

[0038] Furthermore, if Figure 3 As shown, the inner wall surface of the sound cavity 301 is provided with a sound insulation layer 302. By providing the sound insulation layer 302 inside the sound cavity 301, it is possible to prevent the sound of the sound 200 from being transmitted to the outside of the negative pressure screen 100 for optical projection due to its loudness, thereby causing noise to be formed outside the negative pressure screen 100 for optical projection. In addition, by providing the sound insulation layer 302, it is possible to prevent the sound of the sound 200 from being reflected more on the inner wall of the sound cavity 301, thereby causing sound confusion, thereby reducing the sound immersion experience of the audience inside the negative pressure screen 100 for optical projection.

[0039] In addition, the inner wall of the sound cavity 301 facing the outside also has a sound insulation layer 302, which can isolate the sound of the external environment and prevent it from entering the inside of the negative pressure screen 100 for optical projection, affecting the viewing experience of the user when using the negative pressure screen 100 for optical projection. It can also prevent the sound inside the negative pressure screen 100 for optical projection from being transmitted to the outside of the negative pressure screen 100 for optical projection, causing noise to the external environment. At the same time, it can also prevent the sound of the sound 200 in the sound cavity 301 from being reflected more on the inner wall of the sound cavity 301, causing sound confusion, and reducing the sound immersion experience of the audience in the negative pressure screen 100 for optical projection.

[0040] In some embodiments of the present invention, the elasticity of the first region is greater than that of the second region. Specifically, the elasticity of the first region is greater than that of the second region, so that when the negative pressure screen 100 used for optical projection is vacuumed, the fabric gap of the fabric structure of the first region can be increased, thereby improving the sound transmission rate of the sound 200 passing through the inner layer of the screen 10.

[0041] At the same time, the first area of ​​the inner layer curtain 10 can adjust its fabric gap according to the pressure inside the negative pressure curtain 100 for optical projection. In other words, when the internal pressure of the negative pressure curtain 100 for optical projection increases, and until the pressure inside the negative pressure curtain 100 for optical projection is constant, the fabric gap of the first area can be increased to improve the sound transmission rate of the sound 200. When the pressure inside the negative pressure curtain 100 for optical projection is insufficient, the inner layer curtain 10 can reduce the fabric gap of the first area through its elasticity, thereby ensuring that the pressure inside the negative pressure curtain 100 for optical projection is sufficient and preventing the inner layer curtain 10 of the negative pressure curtain 100 for optical projection from collapsing.

[0042] like Figure 3 As shown, the outer structure layer 30 further includes a matching portion 303, and the matching portion 303 is detachably connected to the sound cavity 301. The matching portion 303 can be detachably connected to the sound cavity 301, and can form an integral protective layer outside the outer layer curtain 20 to protect the outer layer curtain 20. In addition, the matching portion 303 can be designed so that the outer layer structure can be beautified, thereby improving the aesthetics of the overall structure of the negative pressure curtain 100 for optical projection.

[0043] It should be noted that the structural frame 40 is a supporting structure disposed between the inner curtain 10 and the outer curtain 20, and the outer structural layer 30 can be used as an external decorative layer of the outer curtain 20. The structural frame 40 and the outer structural layer 30 are not directly connected, and the two are independent structures. In addition, the outer structural layer 30 is formed by connecting the matching part 303 with the sound cavity 301. The sound cavity 301 is sealedly connected to the outer curtain 20, and the matching part 303 is connected to the sound cavity 301. In other words, the connection between the matching part 303 or the entire outer structural layer 30 and the outer curtain 20 is realized through the sound cavity 301.

[0044] In some embodiments of the present invention, the outer structure layer 30 is made of a waterproof and anti-corrosion material. Specifically, the outer structure is made of a waterproof and anti-corrosion material to further improve the water-repellent performance of the negative pressure screen 100 for optical projection, and can also prevent water from entering the sound cavity 301 to cause damage to the sound 200, and the use of anti-corrosion materials can improve the overall service life of the negative pressure screen 100 for optical projection.

[0045] According to the negative pressure curtain 100 for optical projection provided by the embodiment of the present application, negative pressure is formed between the outer curtain 20 and the inner curtain 10 to prevent the inner curtain 10 from collapsing, and the overall structural morphology of the negative pressure curtain 100 for optical projection can be ensured to be stable. The outer structure layer 30 having an acoustic cavity 301 is provided on the outside of the outer curtain 20, and the outer curtain 20 is provided with a sound-permeable hole 201 corresponding to the position of the acoustic cavity 301, thereby allowing the sound of the acoustic 200 in the acoustic cavity 301 to be transmitted through the sound-permeable hole 201 into between the outer curtain 20 and the inner curtain 10. At the same time, the acoustic cavity 301 has an open mouth 3011 facing the sound-permeable hole 201, so that the sound transmission of the acoustic 200 can be more directional, preventing the sound from being propagated randomly and causing confusion of the sound. The inner curtain 10 adopts a woven structure, so the sound of the acoustic 200 can pass through the woven gap in the first area. Furthermore, the fabric gap in the first area corresponding to the inner curtain 10 and the sound-permeable hole 201 is larger than the fabric gap in the second area, so the sound of the sound of the speaker 200 has a higher sound permeability in the first area. Thus, the sound of the external speaker 200 can pass through the outer curtain 20 and the inner curtain 10, and the sound permeability of the speaker 200 is improved by increasing the fabric gap in the first area. This not only realizes the structural form of the negative pressure curtain 100 for optical projection, but also improves the sound permeability of the negative pressure curtain 100 for optical projection, which can bring the audience a more realistic sound immersion experience.

[0046] The above implementation methods are only used to illustrate the embodiments of the present application, and are not limitations on the embodiments of the present application. Ordinary technicians in the relevant technical field can make various changes and modifications without departing from the spirit and scope of the embodiments of the present application. Therefore, all equivalent technical solutions also belong to the scope of the embodiments of the present application. The scope of patent protection of the embodiments of the present application should be limited by the claims.

Claims

1. A negative pressure screen for optical projection, characterized in that: The invention comprises an inner curtain, an outer curtain and an outer structural layer which are arranged in sequence from the inside to the outside, the outer curtain is connected to the inner curtain, and a negative pressure is formed between the outer curtain and the inner curtain through a negative pressure device, the outer curtain is provided with a sound-permeable hole, the outer structural layer has a sound cavity corresponding to the sound-permeable hole, the sound cavity has an open opening facing the sound-permeable hole, and the open opening is sealed and connected to the sound-permeable hole, the sound cavity is used for arranging sound, the inner curtain is an inner curtain of a woven structure, the inner curtain has a first area and a second area, the first area corresponds to the sound-permeable hole, and the woven gap of the first area is larger than the woven gap of the second area.

2. The negative pressure screen for optical projection according to claim 1, characterized in that: It also includes a structural frame, which is located between the inner curtain layer and the outer curtain layer, and the structural frame is detachably connected by a plurality of connecting rods.

3. The negative pressure screen for optical projection according to claim 1, characterized in that: The open mouth of the sound cavity is connected to the sound-permeable hole by means of a sealant.

4. The negative pressure screen for optical projection according to claim 1, characterized in that: A first clamping portion is provided at the open mouth of the sound cavity, and a second clamping portion is provided at the sound-permeable hole. The first clamping portion and the second clamping portion are clamped and connected, and the first clamping portion and the second clamping portion are both covered with a sealing layer on the outside.

5. The negative pressure screen for optical projection according to claim 1, characterized in that: The wall surface of the acoustic cavity facing outwards can open or close the acoustic cavity.

6. The negative pressure screen for optical projection according to claim 5, characterized in that: The inner wall surface of the sound cavity is provided with a sound insulation layer.

7. The negative pressure screen for optical projection according to claim 1, characterized in that: The elasticity of the first region is greater than the elasticity of the second region.

8. The negative pressure screen for optical projection according to claim 1, characterized in that: The outer structure layer also includes a matching portion, and the matching portion is detachably connected to the sound cavity.

9. The negative pressure screen for optical projection according to claim 1, characterized in that: The outer structural layer is made of waterproof and anti-corrosion material.

10. The negative pressure screen for optical projection according to claim 7, characterized in that: The first area of ​​the inner layer curtain can adjust its fabric gap according to the pressure in the negative pressure curtain for optical projection.

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