CN109819368B

CN109819368B - Earplug for earphone

Info

Publication number: CN109819368B
Application number: CN201910205630.5A
Authority: CN
Inventors: 黄匡淙
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-03-19
Filing date: 2019-03-19
Publication date: 2021-05-04
Anticipated expiration: 2039-03-19
Also published as: CN109819368A

Abstract

An earplug for earphone applications, including an earphone consisting of a body containing a driver, a nozzle including a hollow interior through which sound travels, and optionally a cable, the nozzle and body being of an integrally formed or separate attachment structure, the nozzle having an earplug attached thereto by a friction fit, the earplug including an outer surface sized and shaped so that when the earplug is mounted on the nozzle, the earplug and the nozzle can be inserted into an ear canal so that an outer surface tip of the earplug contacts a wall of the ear canal, the earplug further including an opening through which sound is transmitted to the ear canal and toward an inner ear of a user. The invention overcomes the defects of the prior art, has reasonable structure, strong practicability and good sealing performance, effectively improves the tone quality and improves the user experience.

Description

Earplug for earphone

Technical Field

The invention relates to the technical field of earphones, in particular to an earplug applied to an earphone.

Background

With the popularity of handheld phone technology and music players, the transmission of sound is of great significance to users. While smartphones may be able to store and play high quality sound recordings, most of the technology in the phone is futile if the headset is unable to provide high quality sound to the user. In a similar manner, if the headphone system is not comfortable for the user, a large amount of high facsimile sound is not produced for an optimally pleasing experience.

Many small ear speaker systems (earphones) have been developed in the prior art. One system includes two earphones, where each earphone includes a body that houses a transducer (speaker unit) that converts an electronic audio signal into physical sound. The sound is transmitted from the body to a nozzle (earpiece mouthpiece) which is at least partially inserted into the ear canal of the user. In order to make the nozzle more comfortable and to hold it more firmly within the duct, each nozzle may be equipped with an earplug. Earplugs are typically made of a compressible material so that the earplug can be received within the ear canal.

However, conventional nozzle and earplug systems have several disadvantages, for example, conventional earplugs do not allow optimal sound transmission. Furthermore, compression of the earplug by the ear canal wall may result in obstruction of the earplug opening, resulting in distortion of the emitted sound. In addition, conventional earplugs do not optimally conform to the shape of the ear canal and, therefore, do not form a desirable seal within the ear canal.

Accordingly, there is a need for an improvement that improves sound quality or improves comfort of a user using an earplug, while reducing distortion of the sound quality of the earplug caused by compression, while conforming to the human ear canal and forming a sealed earplug therein.

Disclosure of Invention

The technical problem to be solved by the invention is to overcome the defects of the prior art and provide the earplug applied to the earphone, which has the advantages of reasonable structure, strong practicability and good sealing property, effectively improves the tone quality and improves the user experience.

In order to solve the technical problems, the technical scheme provided by the invention is as follows: an earplug for an earphone application, comprising an earphone consisting of a body containing a driver, the driver comprising at least one transducer for receiving and converting audio signals from and into sound, a nozzle and optionally a cable, the driver also being operable to convert wireless audio signals into sound by receiving wireless audio signals, the nozzle comprising a hollow interior through which sound travels, the nozzle and the body being of unitary or separate connecting construction, the earplug being attached to the nozzle by a friction fit, the earplug comprising an outer surface sized and shaped such that when the earplug is mounted on the nozzle, the earplug and the nozzle can be inserted into an ear canal such that an outer surface tip of the earplug contacts a wall of the ear canal, the earplug further comprising an opening through which sound is delivered to the ear canal and towards an inner ear of a user, the earplug comprises an inner core and an outer cover, wherein the outer cover is made of foam or rubber materials, the shape and design of the outer cover enable the outer cover to be in contact with and compressed by the wall of an auditory canal, the inner wall of the inner core limits that sound can pass through the hollow inner cavity, the inner core rear end is arranged at the friction fit joint of the earplug and a nozzle, the sound is sequentially transmitted to the hollow inner cavity and an opening through the nozzle, as an improvement, an ear wax protection device is arranged at the opening of the inner core at the front end of the earplug, the ear wax protection device is made of materials with high air permeability, the outer cover is made of foam materials wholly or partially, the foam is a memory foam material, an antibacterial coating is applied on the foam material, as an improvement, the outer cover of the earplug comprises a rear section and a front section, a connecting part is arranged between the rear section and the front section, and one or more middle sections, the middle section, the rear section and the middle section are cylindrical, oval, paraboloidal or polyhedral in outer contour, the curvature radius of the rear section is smaller than that of the front section, and the connecting part is provided with a reduced thickness part.

Inner core in the earplug includes tubaeform front end and cylindrical part, through toper part transitional coupling between tubaeform front end and the cylindrical part, toper part and front end form the straight cone, front end department is equipped with front end inner core opening, and its opening that is greater than the inner core rear end, the dustcoat includes anterior covering, anterior covering extends to cross the front end and connects front end inner core opening, rear inner core opening connects the earphone nozzle.

As a refinement, the inner core comprises only a cylindrical portion.

As a refinement, the inner core extends to or beyond the entire length of the earplug, and the opening is provided in an alignment or protruding outer cover.

As a refinement, the front core opening in the earplug may be provided as a cylindrical portion, the diameter of the front end of the core being greater than the diameter of the cylindrical portion.

As a modification, the front core opening is cut at an angle and has an oval shape.

As an improvement, one or more side openings are arranged on the front inner core opening.

As a refinement, the inner core extends beyond the outer cover.

Compared with the prior art, the invention has the advantages that: the earplug provided by the invention provides improved sound quality for a user, improves the comfort of the earplug in matching with an ear canal for the user, is designed to have an opening which is not obstructed when the earplug is inserted into the ear canal, and has an improved mode of conforming to the ear canal in the outline design, so that the earplug is reasonable in structure, strong in practicability and good in sealing property, the sound quality is effectively improved, and the user experience is improved.

Drawings

FIG. 1 is a schematic view of a state of use of the present invention;

FIG. 2A is a schematic cross-sectional view of one form of an earplug of the invention;

FIG. 2B is a schematic cross-sectional view of another earplug of the invention;

FIG. 2C is a schematic cross-sectional view of another earplug of the invention;

fig. 2D is a schematic cross-sectional view of another earplug of the invention;

FIG. 2E is a schematic cross-sectional view of another earplug of the invention;

FIG. 3 is a schematic perspective view of an earplug of the invention;

fig. 4A is another schematic side view of an earplug of the invention;

FIG. 4B is another schematic side view of an earplug of the invention;

fig. 4C is a schematic view of the earplug of the invention in use of fig. 4A;

FIG. 5A is a schematic cross-sectional view of an earplug of another form of the invention;

FIG. 5B is a schematic cross-sectional view of an earplug of another form of the invention;

FIG. 5C is a schematic cross-sectional view of an earplug of another form of the invention;

fig. 5D is a schematic cross-sectional view of an earplug of another form of the earplug of the invention;

FIG. 5E is a schematic cross-sectional view of an earplug of another form of the invention;

FIG. 6A is a schematic view of an earplug of the invention in the form of a nozzle for attachment to an earphone;

FIG. 6B is a schematic illustration of the in-use form of FIG. 6A inserted into an ear canal;

FIG. 7A is a partial schematic cross-sectional view of one form of earplug the invention;

FIG. 7B is a partial schematic cross-sectional view of one form of earplug the invention;

FIG. 7C is a partial schematic cross-sectional view of one form of earplug the invention;

fig. 7D is a partial schematic cross-sectional view of one form of earplug the invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

The present invention relates to earplugs, and in particular, to earplugs for headphone applications, and although the use of earplugs for headphones is shown and described in this context, the invention is useful in other contexts as well, and thus, the invention is not intended to be limited to the examples and embodiments described herein.

Fig. 1 shows an earplug 100 according to one aspect of the invention, the earpiece 105 being composed of a body 110, a nozzle 115 and optionally a cable 120, the body 110 containing a device capable of producing sound, the body 110 may house a driver, for example, comprising one or more of a variety of known transducers, which receives audio signals from the cable 120 and converts the audio signals to sound, as is known in the art, or the driver may receive and convert the wireless audio signal into sound, direct the generated sound outwardly from the main body 110 through the nozzle 115, the nozzle 115 including a hollow interior through which the sound travels, the nozzle 115 may be integrally formed with the main body 110, or may be a separately connected component, in one form, the nozzle 115 and the body 110 are injection molded as a single piece, the nozzle 115 being generally rigid in that it resists deformation during normal headphone use.

The earplug 100 includes a hollow interior that receives an exterior portion, the nozzle 115 is as described below such that the earplug 100 is friction fit or can be connected in any other manner with the nozzle 115 engaged, the earplug 100 has an outer surface 125 sized and shaped such that when the earplug 100 is mounted on the nozzle 115, the earplug 100 and the nozzle 115 can be inserted into the ear canal 130 such that the outer surface 125 tip of the earplug 100 contacts the wall 131 of the ear canal 130, the earplug 100 is compressible and compressed by the wall 131 of the ear canal 130 such that it is held in place within the ear canal 130, the earplug 100 further includes an opening 135, although sound generated in the body 110 and transmitted through the nozzle 115 can be transmitted to the transmitting ear canal 130 and toward the inner ear 132 of the user, with the earplug 100 of the present invention, the opening 135 will not be blocked when the earplug 100 is inserted into the ear canal 130 and secured, held in place by the wall 131 of the ear canal, the opening 135 is sized and shaped to provide improved sound transmission, as will be described below.

The earplug 100 includes an inner core 140 and an outer cover 145, the inner core 140 may be made of an elastomer or other material and the outer cover 145 may be made of a relatively rigid material, the outer cover 145 may be made of a foam or rubber material, or the like. In one particular form, the enclosure 145 comprises a memory foam material, such as polyurethane. The shape and design of the outer cover 145 causes the outer cover 145 to contact and be compressed by the wall 131 of the ear canal 130 such that the earplug 100 is secured within the ear canal 130, with the inner wall 150 of the inner core 140 defining a hollow lumen 155 through which sound may travel. The inner core rear end 160 is connected to the nozzle 115 of the earpiece 105 such that the interior of the nozzle communicates with the hollow interior 155 of the earplug 100. in one embodiment, the rear end 160 may receive the nozzle 115 in a friction fit engagement, and sound generated in the body 110 is transmitted through the nozzle 115 to the hollow interior 155 and then directed through the opening 135 in the earplug 100. one advantage of the earplug 100 of the present invention is that the opening 135 of the earplug 100 is not obstructed when the earplug is inserted into the ear canal, the nozzle 115 being inserted from the opening of the rear end 160 of the earplug 100, the obstructed opening being the opening 135 where the outer layer 145 deforms during wear and covers a portion of the opening 135 such that the opening 135 has a smaller area or cross-sectional dimension than the opening of the earplug 100. In conventional earplug designs, the foam covering extends over the inner core at the front end, with the result that compression of the ear canal 130 causes the foam to block the opening of the earplug 100. This obstruction causes sound distortion to be transmitted from the transducer of the nozzle 115 at the body 110 of the earpiece 105, opening when the air pressure encounters a reduction in size, creating turbulence which causes distortion, particularly attenuation of high frequencies, and reduction of sound clarity, the present invention ensures that sound passes through the opening 135, eliminating such distortion of sound remaining unobstructed.

Fig. 2A shows an earplug 100 design with an unobstructed opening 135. In the form of fig. 2A, the inner core 140 includes a flared front end 165, the inner core 140 has a cylindrical portion 170 and then its transition portion is a tapered portion 175 that defines the front end 165 and the tapered portion 175 as a straight cone or may be curved, the flared front end 165 has a front core opening 180 that is larger than the opening of the inner core rear end 160, and further, the outer cover 145 may include a front cover 190 that extends across the front core opening 180 through the front cover 190 provided, the ear canal 130 may comfortably receive sound from the earplug 100, with the compression and deformation 190 of the front being sufficiently small that it does not interfere with the opening 135, the size of the opening 135 maintaining the same or larger size of the nozzle opening or opening of the inner core's lumen 155 when the front cover 190 is compressed.

Fig. 2B to 2E show other forms of the earplug 100, in fig. 2A where the earplug 100 is designed to prevent the opening 135 from blocking the portion of the earplug that is inserted into the ear canal 130, and in the embodiment of fig. 2B the inner core 140 extends the entire length of the earplug 100, and the front portion 190 has no cover 145 to block the opening 135. Fig. 2C is of a type similar to that of fig. 2B, but with the inner core 140 extending beyond the outer cover 145 to further ensure that the opening 135 is unobstructed. The embodiments of 2D and 2E are similar to the embodiments of 2B and 2C, respectively, but the flared inner core 140 is replaced by a fully conical inner core, preventing the opening 135 from being blocked by the eliminated front portion 190. In one embodiment of the present invention of the enclosure 145, the front core opening 180 is larger than the rear core opening 182, and the rear core opening 182 is connected to the earpiece nozzle 115, so that the rear core opening 182 is sized to generally correspond to the outlet size of the nozzle 115. By sizing the front end core opening 180 larger than the rear end core opening 182, sound transmission quality is improved. By making the front core opening 180 larger than the back core opening 182, the air pressure is reduced and thus the more out-going of the reproduced waveform of the acoustic impedance speaker driver at the front core opening 180 is reduced, the air pressure at the front core opening 180 is reduced.

Fig. 3 shows one form of ear wax guard 210 equipped with the earplug 100 of the invention, the ear wax guard 210 may be constructed of a material with high air permeability characteristics, such as foam, fabric, paper, cloth, mesh made of plastic or metal wire, etc., and may be positioned at or near the front end core opening 180. For example, the ear wax guard 210 can be positioned 155 before the front end core opening 180 is positioned over or within the front end core opening 180. The ear wax guard 210 may be positioned cylindrically within the portion 170 of the inner core 140 or within the conical portion 175 of the inner core 140. The outer ear 145 includes a surface 125, the outer surface 125 being in contact with the wall 131 of the ear canal 130 when the earplug 100 is inserted into the ear canal 130, and the outer shell 145 may be made in whole or in part of a compressible material, such as foam 220. In one particular form, the medium foam 220 comprises a memory foam material, such as polyurethane, viscoelastic polyurethane, or low-elasticity polyurethane foam, latex, polyester, and the like. The foam 220 molds to the contours of the ear canal 130 and then returns to its original shape when removed from the compressed environment. In the version shown in fig. 3, the outer cover 145 is constructed entirely from a single piece of foam 220. Alternatively, the enclosure 145 can be made of a variety of materials, including foam 220. For example, the foam 220 may be in another example, the foam 220 may be an inner layer of the enclosure 145 and may be covered with another, different material, such as a different foam or rubber material or some form of coating. In one embodiment, the enclosure 145 is made of two or more materials. The inner foam 220 is coated with an outer layer of an antimicrobial material. The earplug 100 is in primary contact with the ear canal and in contact with cerumen. The foam 220 is not easily cleanable. The foam may be an adverse reaction to alcohol and therefore requires rinsing with water, however, after rinsing with water, it takes a long time for the foam to dry sufficiently for optimum use. By applying an antimicrobial coating to the foam material 220, the earplug 100 does not require frequent cleaning. Water-based coating sprays may be used at the time of manufacture, finished earplugs 100 vapor deposited by plasma gas through the pen-seal chamber using nano-activators, metal-ion compounds mixed into the foam prior to polymerization by using contained antimicrobial agents, or metal-ion compounds, and the like.

In the form shown in fig. 4A, the earplug 100 has a cover 145 formed of more than one section, such as a rear section 230 and a front section 235, with a connecting portion 240 between the rear section 230 and the front section 235 to allow the rear section 230 and the front section 235 to flex relative to each other. Another form of earplug has a rear segment 230 and a front segment 235, and in the form of fig. 4B there are also one or more intermediate segments 245, the rear segment 230 being connected to the intermediate segment 245 by the intermediate segment 245, and the connecting portion 240 and the intermediate segment 245 being connected to the front segment portion 240 by another connection, each segment being bendable relative to each other. The segmented form of the earplug 100, such as those shown in fig. 4A and 4B, allows for an improved fit of the earplug 100 within the ear canal 120, as shown in fig. 4C, the bending of the front segment 235 relative to the rear segment 230 allows for segments to conform to the ear canal 120 and provides for an improved internal sealing of the earplug 100 of the ear canal 120. For example, the seal improves in a manner that isolates ambient noise, and further, with the improved seal, there is less leakage, reducing bass and audio quality. If the seal is broken, bass will be the first sound quality to be disturbed, and furthermore external ambient sounds can be heard and music can be disturbed. One or more of the middle section 245, the middle section 230, and the rear section 230 have different outer and other section profile shapes. For example, in the form of FIG. 4A, the posterior segment 230 has an at least partially conical outer profile and the anterior segment 235 is at least partially spherical. In the form of fig. 4B, the intermediate section 245 also has an at least partially conical outer profile. In the alternative, the outer profile of one or more of the rear section 230, front section 235 and middle section 245 in a segment may be cylindrical, oval, parabolic or polyhedral. The different outer profiles of the segments may also be partial ramps of the same type of profile shape but made in different sizes, all segments may be the same or similar.

Fig. 5A to 5E show cross-sectional views of an earplug 100 having segments, the outer cover 145 the inner core 140 of each of fig. 5A to 5E being similar to the inner core 140 of fig. 2A to 2E, respectively, in which embodiment the rear segment 230 and the front segment 235 both have a part-spherical outer profile but different radii of curvature, in the form shown the rear segment 230 having a radius of curvature less than the front segment 235, the connecting portion 240 having a reduced thickness portion 250 which allows the rear segment 230 to bend relative to the front segment.

Fig. 6A shows the mounting on a nozzle 115 of a conventional earplug 100 and fig. 6B shows the insertion into the ear canal 130.

The earplug 100 and nozzle 115 of fig. 7A as can be seen in fig. 7B, the distal section 235 and outer proximal section 230 caps 145 can compress and bend relative to each other. This dual action compression and bending allows the shell 145 to better conform to the shaped ear canal 120. When the outer cover 145 is deformed, the inner core 140 remains undeformed. It can also be seen from fig. 7B that deformation of the outer cover 145 does not interfere with the opening 135 of the earplug 100, and fig. 7A-7D show an alternative design for the core 140. In all of these embodiments, the front core opening 180 is larger in area than the rear core opening 182, and the form of FIG. 7A is similar to the flare opening discussed above, but the flare is replaced by a cylindrical portion 310, and the diameter of the front end of the core 140 is larger than the diameter of the cylindrical portion 170. In the form of fig. 7B, the front core opening 180 is cut at an angle and has an oval shape 320, the oval shape 320 being formed to be larger than the circular shape in the form of fig. 7C, the front core opening 180 including one or more side openings 330, the sum of the sizes of the end openings being larger. And the side openings 330 to an area larger than the rear core openings 182. The form of fig. 7D is similar to that of fig. 7A, but the core 140 extends beyond the shell the earplug 100 of the present invention may be manufactured using known manufacturing techniques, such as extrusion and/or injection molding. For embodiments 140 in which the core is entirely cylindrical, the core 140 may be extruded, cut to a specified length, and then assembled within the outer cover 145. For embodiments in which the core 140 is asymmetric, the core 140 may be made by injection molding and then may be separately embedded in the outer cover 145 during polymerization of the foam 220.

The present invention and its embodiments have been described above, and the description is not intended to be limiting, and the drawings are only one embodiment of the present invention, and the actual structure is not limited thereto. In summary, those skilled in the art should appreciate that they can readily use the disclosed conception and specific embodiments as a basis for designing or modifying other structures for carrying out the same purposes of the present invention without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. An earplug for a headphone application, comprising a headphone (105), characterized in that: the earpiece (105) is comprised of a body (110), a nozzle (115) and optionally a cable (120), the body (110) containing a driver, the driver including at least one transducer for receiving and converting audio signals from and to sound from the cable (120), while the driver may also convert wireless audio signals to sound by receiving and converting wireless audio signals, the nozzle (115) including a hollow interior through which sound travels, the nozzle (115) and body (110) being of an integrally formed or separate connected construction, the earpiece (100) being connected by a friction fit over the nozzle (115), the earpiece (100) including an outer surface (125) sized and shaped such that the earpiece (100) and nozzle (115) may be inserted into the ear canal (130) when the earpiece (100) is mounted over the nozzle (115), -bringing the tip of the outer surface (125) of the earplug (100) into contact with the wall (131) of the ear canal (130), the earplug (100) further comprising an opening (135) through which sound is transmitted to the ear canal (130) and towards the inner ear (132) of the user, the earplug (100) comprising an inner core (140) and an outer cover (145), the outer cover (145) being made of a foam or rubber material, the outer cover (145) being shaped and designed such that the outer cover (145) is brought into contact with and compressed by the wall (131) of the ear canal (130), the inner wall (150) of the inner core (140) defining a hollow lumen (155) through which sound can pass, the earplug (100) and the nozzle (115) being provided at a friction-fit connection with a core rear end (160), sound passing through the nozzle (115) in turn through the hollow lumen (155), the opening (135); an ear wax protection device (210) is arranged at the position of an inner core opening (180) at the front end of the earplug (100), the ear wax protection device (210) is made of a material with high air permeability, the outer cover (145) is made of a foam (220) material in whole or in part, the foam (220) is a memory foam material, and an antibacterial coating is applied on the foam (220) material; the outer cover (145) of the earplug (100) comprises a rear section (230) and a front section (235), a connecting part (240) is arranged between the rear section (230) and the front section (235), one or more middle sections (245) are optionally arranged between the rear section (230) and the front section (235), a connecting part (240) is arranged between the middle sections (245) and the rear section (230) and the front section (235), the rear section (230), the front section (235) and the middle sections (245) can be bent relative to each other, the outer contours of the rear section (230), the front section (235) and the middle sections (245) are cylindrical, oval, paraboloid or polyhedron, the curvature radius of the rear section (230) is smaller than that of the front section (235), and the connecting part (240) is provided with a thickness reducing part (250); the front end core opening (180) of the earplug (100) may be provided as a cylindrical portion (310), the diameter of the front end open cylindrical portion (310) of the core (140) being greater than the diameter of the rear end open cylindrical portion (170).

2. An earplug for a headphone application according to claim 1, wherein: the front end inner core opening (180) is cut at an angle and is oval (320).

3. An earplug for a headphone application according to claim 1, wherein: one or more side openings (330) are arranged on the front end inner core opening (180).

4. An earplug for a headphone application according to claim 1, wherein: the inner core (140) extends beyond the outer cover (145).

5. An earplug for a headphone application, comprising a headphone (105), characterized in that: the earpiece (105) is comprised of a body (110), a nozzle (115) and optionally a cable (120), the body (110) containing a driver, the driver including at least one transducer for receiving and converting audio signals from and to sound from the cable (120), while the driver may also convert wireless audio signals to sound by receiving and converting wireless audio signals, the nozzle (115) including a hollow interior through which sound travels, the nozzle (115) and body (110) being of an integrally formed or separate connected construction, the earpiece (100) being connected by a friction fit over the nozzle (115), the earpiece (100) including an outer surface (125) sized and shaped such that the earpiece (100) and nozzle (115) may be inserted into the ear canal (130) when the earpiece (100) is mounted over the nozzle (115), -bringing the tip of the outer surface (125) of the earplug (100) into contact with the wall (131) of the ear canal (130), the earplug (100) further comprising an opening (135) through which sound is transmitted to the ear canal (130) and towards the inner ear (132) of the user, the earplug (100) comprising an inner core (140) and an outer cover (145), the outer cover (145) being made of a foam or rubber material, the outer cover (145) being shaped and designed such that the outer cover (145) is brought into contact with and compressed by the wall (131) of the ear canal (130), the inner wall (150) of the inner core (140) defining a hollow lumen (155) through which sound can pass, the earplug (100) and the nozzle (115) being provided at a friction-fit connection with a core rear end (160), sound passing through the nozzle (115) in turn through the hollow lumen (155), the opening (135); an ear wax protection device (210) is arranged at the position of an inner core opening (180) at the front end of the earplug (100), the ear wax protection device (210) is made of a material with high air permeability, the outer cover (145) is made of a foam (220) material in whole or in part, the foam (220) is a memory foam material, and an antibacterial coating is applied on the foam (220) material; the outer cover (145) of the earplug (100) comprises a rear section (230) and a front section (235), a connecting part (240) is arranged between the rear section (230) and the front section (235), one or more middle sections (245) are optionally arranged between the rear section (230) and the front section (235), a connecting part (240) is arranged between the middle sections (245) and the rear section (230) and the front section (235), the rear section (230), the front section (235) and the middle sections (245) can be bent relative to each other, the outer contours of the rear section (230), the front section (235) and the middle sections (245) are cylindrical, oval, paraboloid or polyhedron, the curvature radius of the rear section (230) is smaller than that of the front section (235), and the connecting part (240) is provided with a thickness reducing part (250); the inner core (140) of the earplug (100) comprises a trumpet-shaped front end (165) and a cylindrical part (170), the trumpet-shaped front end (165) and the cylindrical part (170) are in transitional connection through a conical part (175), the conical part (175) and the front end (165) form a right cone, a front end inner core opening (180) is arranged at the front end (165) and is larger than an opening of the inner core rear end (160), the outer cover (145) comprises a front cover piece (190), the front cover piece (190) extends to cross the front end (165) to be connected with the front end inner core opening (180), and the rear inner core opening (182) is connected with the earphone nozzle (115).

6. An earplug for a headphone application according to claim 5, wherein: the inner core (140) extends to or beyond the entire length of the earplug (100) and the opening (135) is disposed in alignment with or protruding from the outer cover (145).