A sub-wavelength scale noise reducing earplug

Abstract

The application discloses a noise reduction earplug for subwavelength scale, which comprises an earplug outer mode and an earplug support, the earplug support is sequentially connected by a first support column, a first support disc, a second support column, a second support disc, a third support column, a third support disc, a fourth support column and a fourth support disc from top to bottom, the earplug support is arranged in the earplug outer mode, and the inner wall of the earplug outer mode is nested with the outer wall of the fourth support disc; the earplug outer mode is filled with polyurethane; the diameters of the first support disc, the second support disc, the third support disc and the fourth support disc are sequentially increased, a plurality of sound absorption holes with the same size are arranged in the middle of each support disc, and four assembling holes with the same size are uniformly arranged at the edges of each support disc; four second support columns, third support columns and fourth support columns are arranged; and the first support column is manufactured by 3D printing.

Description

Technical Field

[0001] This invention belongs to the field of sound protection equipment manufacturing technology, specifically relating to a noise-canceling earplug for subwavelength scales and its manufacturing process. Background Technology

[0002] With increasing environmental noise pollution, prolonged exposure to noisy environments can lead to hearing loss in workers, necessitating health protection measures. External noise negatively impacts people's lives, studies, and work, and the most common protective measure is for workers to wear noise-canceling earplugs.

[0003] Currently available noise-canceling earplugs have relatively simple noise-dampening structures, but their manufacturing processes are extremely complex. For example, the earplug shell must be manufactured using complex molding processes on industrial equipment, which takes a long time from design to production and is not conducive to small-scale personal production. Furthermore, in individual combat situations where the enemy launches a sonic attack, earplugs are urgently needed for protection, but the time required to manufacture and ship noise-canceling earplugs is too long. Therefore, there is a pressing need for a method that can quickly manufacture noise-canceling earplugs using fewer and more readily available raw materials. In addition, conventional noise-canceling earplugs cannot cope with strong noise; they only meet the noise reduction requirements of ordinary daily life and cannot effectively protect hearing or suppress noise in high-noise environments such as aviation ground crew operations or die-casting and stamping. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a noise-canceling earplug for the subwavelength scale. The earplug can be quickly assembled using 3D-printed parts and polyurethane to cope with strong noise, thereby solving the noise reduction problem in complex environments, improving the noise reduction effect, and protecting the user's hearing.

[0005] The objective of this invention is achieved through the following technical solution:

[0006] A noise-canceling earplug for subwavelength scales includes an earplug outer mold and an earplug support. The earplug support is composed of a first pillar, a first support plate, a second pillar, a second support plate, a third pillar, a third support plate, a fourth pillar, and a fourth support plate connected to each other from top to bottom. The earplug support is disposed inside the earplug outer mold. The inner wall of the earplug outer mold is nested and assembled with the outer wall of the fourth support plate. The outer wall of the earplug outer mold is made of a soft foam material that fits against the inner ear wall. The earplug outer mold is filled with polyurethane.

[0007] The diameters of the first support plate, the second support plate, the third support plate and the fourth support plate increase sequentially, and each support plate has several sound-absorbing holes of the same size in the middle, and each support plate has four assembly holes of the same size evenly distributed on its edge.

[0008] The second, third, and fourth pillars are each provided in fours;

[0009] The first pillar is manufactured by 3D printing and consists of four pillars. The four pillars at the top of the first pillar are cut and then attached to each other. The four pillars at the bottom of the first pillar are respectively fixed in the four assembly holes on the first support plate.

[0010] This invention also provides a manufacturing process for producing noise-canceling earplugs, which first involves 3D printing a first pillar, a second pillar, a third pillar, a fourth pillar, a first support plate, a second support plate, a third support plate, and a fourth support plate; and then assembling the earplug holder through the following process:

[0011] The first support column is provided with a first support column fixing ring, a first support column assembly shaft, and a first support column internal thread. The first support plate is provided with a first support plate assembly hole and a first support plate sound-absorbing hole. The second support column is provided with a second support column external thread, a second support column upper assembly shaft, a second support column upper fixing ring, a second support column lower fixing ring, a second support column lower assembly shaft, and a second support column internal thread. The first support column assembly shaft and the second support column upper assembly shaft are clearance-fitted through the first support plate assembly hole and are threadedly connected and fixed through the first support column internal thread and the second support column external thread. The first support column fixing ring and the second support column upper fixing ring axially fix the first support plate. The axial length of the first support column assembly shaft and the second support column upper assembly shaft is the same and is 1 / 2 of the thickness of the first support plate.

[0012] The second support plate is provided with a second support plate assembly hole and a second support plate sound-absorbing hole. The third support column is provided with a third support column external thread, a third support column upper assembly shaft, a third support column upper fixing ring, a third support column lower fixing ring, a third support column lower assembly shaft, and a third support column internal thread. The third support plate is provided with a third support plate assembly hole and a third support plate sound-absorbing hole. The second support column lower assembly shaft and the third support column upper assembly shaft are clearance-fitted through the second support plate assembly hole and are threadedly connected and fixed by the second support column internal thread and the third support column external thread. The second support plate is axially fixed by the second support column lower fixing ring and the third support column upper fixing ring. The axial length of the second support column lower assembly shaft and the third support column upper assembly shaft is the same and is 1 / 2 of the thickness of the second support plate.

[0013] The fourth support column is provided with an external thread, an upper mounting shaft, an upper fixing ring, a lower fixing ring, a lower mounting shaft, and an internal thread. The lower mounting shaft of the third support column and the upper mounting shaft of the fourth support column are clearance-fitted through the mounting hole of the third support plate and are threadedly connected and fixed by the internal thread of the third support column and the external thread of the fourth support column. The lower fixing ring of the third support column and the upper fixing ring of the fourth support column axially fix the third support plate. The axial length of the lower mounting shaft of the third support column and the upper mounting shaft of the fourth support column are the same and are 1 / 2 of the thickness of the third support plate.

[0014] The fourth support plate is provided with a fourth support plate assembly hole and a fourth support plate sound absorption hole. The fourth support column is connected and fixed by an internal thread and a fixing bolt. The lower fixing ring of the fourth support column is axially fixed to the fourth support plate by the fixing bolt. The lower assembly shaft of the fourth support column has the same thickness as the fourth support plate.

[0015] Next, the earbud support is placed inside the earphone mold, sprayed with polyurethane, and solidified.

[0016] Finally, pressure is applied to the outer mold of the earphone and it is extruded to obtain a noise-canceling earphone for subwavelength scales.

[0017] The present invention also provides a manufacturing process for making noise-canceling earplugs, comprising:

[0018] Manufacture the first pillar, second pillar, third pillar, fourth pillar, first support plate, second support plate, third support plate, and fourth support plate using 3D printing;

[0019] The first step involves assembling and fixing the first pillar, the first support plate, and the second pillar together, placing them inside the outer mold of the earphone, spraying the assembly with polyurethane, and then solidifying it.

[0020] The second step involves using a second support plate and a third pillar to further assemble and fix the assembled body based on the first step's molded body. Then, polyurethane is sprayed onto the assembled body, and it solidifies and takes shape.

[0021] The third step involves fixing the assembly based on the molded body from the second step using a third support plate, a fourth pillar, a fourth support plate, and fixing bolts for fixing the fourth support plate. Then, the assembly is sprayed with polyurethane and solidified.

[0022] The fourth step involves applying pressure to the outer mold of the earphone and extruding it to obtain a noise-canceling earplug designed for subwavelength scales.

[0023] Compared with the prior art, the beneficial effects of the technical solution of the present invention are:

[0024] 1. The rapid prototyping manufacturing process for noise-canceling earplugs of the present invention requires very few raw materials, only three types: 3D printing materials, polyurethane, and foam soft material for the earplug outer mold. It can quickly produce finished noise-canceling earplugs without relying on industrial equipment, and the time required from raw materials to finished earplugs is extremely short.

[0025] 2. The rapid prototyping manufacturing process for noise-canceling earplugs of the present invention, through the sound-absorbing holes of the first, second, third, and fourth support discs and the sound-absorbing hole effect of polyurethane, can effectively absorb strong noise at the subwavelength scale.

[0026] 3. The rapid prototyping manufacturing process for noise-canceling earplugs of the present invention is based on the design of acoustic metamaterials, which breaks the traditional noise-canceling earplug production technology. Since the finished product is mainly a simple mechanical structure assembly and does not require complex industrial design stamping, the yield rate is basically 100%, and it is conducive to small-scale rapid production and use by individuals. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the exploded structure of the earplug support in an embodiment of the present invention;

[0028] Figure 2 This is a schematic diagram of the earbud holder assembly.

[0029] Figure 3 A schematic diagram of the noise-canceling earplug assembly;

[0030] Figure 4 This is a schematic diagram of the structure of an explosion-prone noise-canceling earplug.

[0031] Figure 5 Schematic diagram I for the first pillar;

[0032] Figure 6 Diagram II of the first pillar;

[0033] Figure 7 This is a schematic diagram of the second pillar;

[0034] Figure 8 This is a schematic diagram of the third pillar;

[0035] Figure 9 This is a schematic diagram of the fourth pillar;

[0036] Figure 10 This is a schematic diagram of the first plate;

[0037] Figure 11 This is a schematic diagram of the second plate;

[0038] Figure 12 This is a schematic diagram of the third plate;

[0039] Figure 13 This is a schematic diagram of the fourth plate;

[0040] Figure 14 This is a schematic diagram of polyurethane spraying.

[0041] Figure 15 A flowchart of the rapid prototyping manufacturing process for noise-canceling earplugs;

[0042] Figure 16 This is a picture of the actual earphone stand.

[0043] Figure 17 Image I shows a sample of a noise-canceling earplug.

[0044] Figure 18 Image II of the actual noise-canceling earplugs;

[0045] Figure 19 A physical model of a human ear-noise-canceling earplug, incorporating a simulated human ear canal.

[0046] Reference numerals: 1-First support post, 10-Earplug holder, 11-First support post retaining ring, 12-First support post assembly shaft, 13-First support post internal thread, 2-First support plate, 21-First support plate assembly hole, 22-First support plate sound-absorbing hole, 3-Second support post, 31-Second support post external thread, 32-Second support post upper assembly shaft, 33-Second support post upper retaining ring, 34-Second support post lower retaining ring, 35-Second support post lower assembly shaft, 36-Second support post internal thread, 4-Second support plate, 41-Second support plate assembly hole, 42-Second support plate sound-absorbing hole, 5-Third support post, 51-Third support post external thread, 52-Third support post... 53-Fixing shaft on the third support column, 54-Fixing ring on the lower part of the third support column, 55-Fixing shaft on the lower part of the third support column, 56-Internal thread of the third support column, 6-Third support plate, 61-Fixing hole of the third support plate, 62-Sound-absorbing hole of the third support plate, 7-Fourth support column, 71-External thread of the fourth support column, 72-Fixing shaft on the upper part of the fourth support column, 73-Fixing ring on the upper part of the fourth support column, 74-Fixing ring on the lower part of the fourth support column, 75-Fixing shaft on the lower part of the fourth support column, 76-Internal thread of the fourth support column, 8-Fourth support plate, 81-Fixing hole of the fourth support plate, 82-Sound-absorbing hole of the fourth support plate, 9-Earplug outer mold, 91-Polyurethane, 101-Human ear canal model. Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0048] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0049] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0050] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. In addition, the terms "first," "second," "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0051] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0052] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0053] Example 1

[0054] like Figure 1-19 As shown, a rapid prototyping manufacturing process for noise-canceling earplugs targeting subwavelength scales includes an earplug outer mold 9 and an earplug support 10. The earplug support 10 is mainly composed of a first pillar 1, a first support plate 2, a second pillar 3, a second support plate 4, a third pillar 5, a third support plate 6, a fourth pillar 7, and a fourth support plate 8. The inner wall of the earplug outer mold 9 is nested and assembled with the outer wall of the fourth support plate 8. The outer wall of the earplug outer mold 9 is made of a soft foam material that fits against the inner ear wall.

[0055] In this embodiment, the diameters of the first support plate 2, the second support plate 4, the third support plate 6 and the fourth support plate 8 increase sequentially. The four supports at the top of the first support plate 1 are fixed together after cutting. The four supports at the bottom of the first support plate 1 are respectively fixed in the four first support plate assembly holes 21 on the first support plate.

[0056] Furthermore, the first support column 1 is provided with a first support column fixing ring 11, a first support column mounting shaft 12, and a first support column internal thread 13; the first support plate 2 is provided with a first support plate mounting hole 21 and a first support plate sound-absorbing hole 22; the second support column 3 is provided with a second support column external thread 31, a second support column upper mounting shaft 32, a second support column upper fixing ring 33, a second support column lower fixing ring 34, a second support column lower mounting shaft 35, and a second support column internal thread 36. The first support column mounting shaft 12 and the second support column upper mounting shaft 32 can be clearance-fitted through the first support plate mounting hole 21 and threadedly connected and fixed through the first support column internal thread 13 and the second support column external thread 31. The first support column fixing ring 11 and the second support column upper fixing ring 33 axially fix the first support plate 2. The axial lengths of the first support column mounting shaft 12 and the second support column upper mounting shaft 32 are the same and are 1 / 2 the thickness of the first support plate 2.

[0057] The second support plate 4 is provided with a second support plate mounting hole 41 and a second support plate sound-absorbing hole 42. The third support column 5 is provided with a third support column external thread 51, a third support column upper mounting shaft 52, a third support column upper fixing ring 53, a third support column lower fixing ring 54, a third support column lower mounting shaft 55, and a third support column internal thread 56. The third support plate 6 is provided with a third support plate mounting hole 61 and a third support plate sound-absorbing hole 62. The second support column lower mounting shaft 35 and the third support column upper mounting shaft 52 can be clearance-fitted through the second support plate mounting hole 41 and are threadedly connected and fixed by the second support column internal thread 36 and the third support column external thread 51. The second support plate 4 is axially fixed by the second support column lower fixing ring 34 and the third support column upper fixing ring 53. The axial length of the second support column lower mounting shaft 35 and the third support column upper mounting shaft 52 is the same and is 1 / 2 the thickness of the second support plate 4.

[0058] The fourth support 7 is provided with an external thread 71, an upper mounting shaft 72, an upper fixing ring 73, a lower fixing ring 74, a lower mounting shaft 75, and an internal thread 76. The lower mounting shaft 55 and the upper mounting shaft 72 of the third support can be fitted with the mounting hole 61 of the third support plate through clearance, and are threadedly connected and fixed to the external thread 71 of the fourth support plate through the internal thread 56 of the third support plate. The lower fixing ring 54 and the upper fixing ring 73 of the third support plate axially fix the third support plate 6. The axial length of the lower mounting shaft 55 and the upper mounting shaft 72 of the third support plate is the same and is 1 / 2 the thickness of the third support plate 4. The fourth support plate 8 is provided with a mounting hole 81 and a sound-absorbing hole 82. The internal thread 76 of the fourth support plate is connected and fixed to the fixing bolt. The lower fixing ring 74 of the fourth support plate is axially fixed to the fourth support plate 6 through the fixing bolt. The lower mounting shaft 75 of the fourth support plate is the same thickness as the fourth support plate 4.

[0059] Furthermore, the second support column 3, the third support column 5, and the fourth support column 7 have the same structural dimensions, and four of each of the second support column 3, the third support column 5, and the fourth support column 7 are provided. The sound-absorbing holes and assembly holes provided on the first support plate 2, the second support plate 4, the third support plate 6, and the fourth support plate 8 are all the same size.

[0060] In this embodiment, the first support column 1, the second support column 3, the third support column 5, and the fourth support column 7 are all provided with external threads so that the fixing rings on each support column can fix each support plate.

[0061] Furthermore, the first pillar 1 is manufactured by 3D printing, and then four sets of the second pillar 3, the third pillar 5 and the fourth pillar 7 are manufactured by 3D printing respectively. Finally, the first support plate 2, the second support plate 4, the third support plate 6 and the fourth support plate 8 are manufactured by 3D printing.

[0062] This embodiment provides a rapid prototyping manufacturing process for subwavelength scale noise-canceling earbuds:

[0063] The first step involves assembling and fixing the first support pillar 1, the first support plate 2, and the second support pillar 3 together, placing them inside the earphone outer mold 9, spraying the assembly with polyurethane 91, and then solidifying it.

[0064] The second step involves using the second support plate 4 and the third support column 5 to further assemble and fix the assembled body based on the first step's molded body, then spraying the assembled body with polyurethane 91 and solidifying it.

[0065] The third step involves fixing the assembly based on the molded body from the second step using the third support plate 6, the fourth support column 7, the fourth support plate 8, and the fixing bolts for fixing the fourth support plate. Then, the assembly is sprayed with polyurethane 91 and solidified.

[0066] The fourth step involves applying pressure to the outer mold 9 of the earphone and extruding it to obtain a noise-canceling earbud designed for subwavelength scales. The finished product is shown below. Figure 15-18 As shown.

[0067] Example 2

[0068] The earbud support 10 can also be designed as an integrated unit. The earbud support 10 is manufactured by 3D printing. In this case, the rapid prototyping manufacturing process for the subwavelength scale noise-canceling earbud is as follows: First, the earbud support 10 is placed into the outer mold 9 of the earphone, sprayed with polyurethane 91, and solidified. Second, pressure is applied to the outer mold 9 of the earphone and extruded to obtain a subwavelength scale noise-canceling earbud.

[0069] Example 3

[0070] The first support plate 2, the second support plate 4, the third support plate 6, and the fourth support plate 8 can also be designed to be the same size. For example, taking the third support plate 6 as an example, the first support plate 2, the second support plate 4, the third support plate 6, and the fourth support plate 8 are replaced with four sets of third support plates 6. Since the second support column 3, the third support column 5, and the fourth support column 7 are all the same in shape and size, the rapid prototyping manufacturing process for a subwavelength scale noise-canceling earphone requires printing one first support column 1, 16 second support columns 3, and four third support plates 6. The first step is to combine the first support column 1, the third support plate 6, and the second support column 3. The assembly is fixed and placed inside the earphone outer mold 9, then sprayed with polyurethane 91 and solidified. The second step involves further assembling and fixing the assembly with the third support plate 6 and the second pillar 3, then spraying the assembly with polyurethane 91 and solidifying it. The third step involves assembling and fixing the assembly with the third support plate 6, the second pillar 3, the third support plate 6, and the fixing bolts for fixing the third support plate, then spraying the assembly with polyurethane 91 and solidifying it. The fourth step involves applying pressure to the earphone outer mold 9 and extruding it to obtain a noise-canceling earplug for subwavelength scales.

[0071] This invention is not limited to the embodiments described above. The above description of specific embodiments is intended to illustrate and explain the technical solutions of this invention. The specific embodiments described above are merely illustrative and not restrictive. Without departing from the spirit and scope of the claims, those skilled in the art can make many specific modifications based on the teachings of this invention, and these modifications all fall within the scope of protection of this invention.

Claims

1. A noise-canceling earplug for subwavelength scales, characterized in that, The device includes an earplug outer mold and an earplug support. The earplug support is composed of a first pillar, a first support plate, a second pillar, a second support plate, a third pillar, a third support plate, a fourth pillar, and a fourth support plate connected to each other from top to bottom. The earplug support is disposed inside the earplug outer mold. The inner wall of the earplug outer mold is nested and assembled with the outer wall of the fourth support plate. The outer wall of the earplug outer mold is made of soft foam material that fits against the inner ear wall. The earplug outer mold is filled with polyurethane. The diameters of the first support plate, the second support plate, the third support plate and the fourth support plate increase sequentially, and each support plate has several sound-absorbing holes of the same size in the middle, and each support plate has four assembly holes of the same size evenly distributed on its edge. The second, third, and fourth pillars are each provided in fours; The first pillar is manufactured by 3D printing and consists of four pillars. The four pillars at the top of the first pillar are cut and then attached to each other. The four pillars at the bottom of the first pillar are respectively fixed in the four assembly holes on the first support plate.

2. A manufacturing process for producing the noise-canceling earplugs of claim 1, characterized in that, First, the first, second, third, and fourth pillars, as well as the first, second, third, and fourth support plates, are manufactured using 3D printing. These are then assembled into the earphone holder through the following process: The first support column is provided with a first support column fixing ring, a first support column assembly shaft, and a first support column internal thread. The first support plate is provided with a first support plate assembly hole and a first support plate sound-absorbing hole. The second support column is provided with a second support column external thread, a second support column upper assembly shaft, a second support column upper fixing ring, a second support column lower fixing ring, a second support column lower assembly shaft, and a second support column internal thread. The first support column assembly shaft and the second support column upper assembly shaft are clearance-fitted through the first support plate assembly hole and are threadedly connected and fixed through the first support column internal thread and the second support column external thread. The first support column fixing ring and the second support column upper fixing ring axially fix the first support plate. The axial length of the first support column assembly shaft and the second support column upper assembly shaft is the same and is 1 / 2 of the thickness of the first support plate. The second support plate is provided with a second support plate assembly hole and a second support plate sound-absorbing hole. The third support column is provided with a third support column external thread, a third support column upper assembly shaft, a third support column upper fixing ring, a third support column lower fixing ring, a third support column lower assembly shaft, and a third support column internal thread. The third support plate is provided with a third support plate assembly hole and a third support plate sound-absorbing hole. The second support column lower assembly shaft and the third support column upper assembly shaft are clearance-fitted through the second support plate assembly hole and are threadedly connected and fixed by the second support column internal thread and the third support column external thread. The second support plate is axially fixed by the second support column lower fixing ring and the third support column upper fixing ring. The axial length of the second support column lower assembly shaft and the third support column upper assembly shaft is the same and is 1 / 2 of the thickness of the second support plate. The fourth support column is provided with an external thread, an upper mounting shaft, an upper fixing ring, a lower fixing ring, a lower mounting shaft, and an internal thread. The lower mounting shaft of the third support column and the upper mounting shaft of the fourth support column are clearance-fitted through the mounting hole of the third support plate and are threadedly connected and fixed by the internal thread of the third support column and the external thread of the fourth support column. The lower fixing ring of the third support column and the upper fixing ring of the fourth support column axially fix the third support plate. The axial length of the lower mounting shaft of the third support column and the upper mounting shaft of the fourth support column are the same and are 1 / 2 of the thickness of the third support plate. The fourth support plate is provided with a fourth support plate assembly hole and a fourth support plate sound absorption hole. The fourth support column is connected and fixed by an internal thread and a fixing bolt. The lower fixing ring of the fourth support column is axially fixed to the fourth support plate by the fixing bolt. The lower assembly shaft of the fourth support column has the same thickness as the fourth support plate. Next, the earbud support is placed inside the earphone mold, sprayed with polyurethane, and solidified. Finally, pressure is applied to the outer mold of the earphone and it is extruded to obtain a noise-canceling earphone for subwavelength scales.

3. A manufacturing process for producing the noise-canceling earplugs of claim 1, characterized in that, include: Manufacture the first pillar, second pillar, third pillar, fourth pillar, first support plate, second support plate, third support plate, and fourth support plate using 3D printing; The first step involves assembling and fixing the first pillar, the first support plate, and the second pillar together, placing them inside the outer mold of the earphone, spraying the assembly with polyurethane, and then solidifying it. The second step involves using a second support plate and a third pillar to further assemble and fix the assembled body based on the first step's molded body. Then, polyurethane is sprayed onto the assembled body, and it solidifies and takes shape. The third step involves fixing the assembly based on the molded body from the second step using a third support plate, a fourth pillar, a fourth support plate, and fixing bolts for fixing the fourth support plate. Then, the assembly is sprayed with polyurethane and solidified. The fourth step involves applying pressure to the outer mold of the earphone and extruding it to obtain a noise-canceling earplug designed for subwavelength scales.

Images