Ear muff connecting frame fixing structure of headphone

Abstract

The utility model relates to the technical field of headphones, in particular to an ear muff connecting frame fixing structure of a headphone, which comprises an ear muff main body and a connecting frame, the ear muff main body comprises an audio module, a front cover with a listening hole and a rear protective cover, and the front cover with the listening hole and the rear protective cover are mutually covered. The audio module is arranged in the front cover with the listening hole and the rear protective cover, a connecting groove of an inward concave structure is formed between the front cover with the listening hole and the rear protective cover after the front cover with the listening hole and the rear protective cover are closed, and rotating shaft holes are formed in the positions, corresponding to the two sides of the earmuff body, of the connecting groove respectively; and through the matching design of the connecting groove, the rotating shaft hole, the arc-shaped part and the rotating shaft part, the connection between the ear muff main body and the connecting frame is more stable. Compared with a traditional connection mode, when the structure bears pulling force, all the components are mutually restricted, and the possibility of connection looseness caused by pulling is reduced. Due to the unique splicing structure of the groove bottom and the groove side parts of the connecting groove, the wrapping and fixing effects on the connecting frame are further enhanced after the connecting frame is covered.

Description

Technical Field

[0001] This utility model relates to the field of headphone technology, and in particular to a headphone earcup connecting frame fixing structure. Background Technology

[0002] With the development of audio technology, over-ear headphones have become popular among consumers due to their excellent sound quality and comfortable fit. Over-ear headphones mainly consist of a headband and earcups connected to both ends of the headband. The design of the connection structure is particularly crucial to meet the wearing needs of different users.

[0003] Currently, a common design involves connecting the earcups and headband via a connecting frame. One end of the connecting frame has an adjustment mechanism attached to the headband, allowing for adjustment of the frame's extension and retraction, thus fine-tuning the distance between the earcups and headband for a more comfortable fit. The other end uses two swivel shafts that can rotate to the sides of the earcups, allowing them to rotate relative to the connecting frame at a certain angle to ensure a more suitable fit to the user's ears. Headphones described in utility model patents CN202276448U and CN205305075U both utilize this type of structure.

[0004] However, this seemingly reasonable structure has obvious drawbacks. In actual use, the earcups are prone to detaching from the connecting frame. When adjusting the distance between the earcups and the headband, many users habitually grasp the earcups to move the connecting frame and the adjustment mechanism, which subjects the structure connecting the earcups to significant tensile force. Over time, the hinge and earcups are very likely to detach, leading to damage to the headphones, affecting the user experience, and increasing repair costs and after-sales burden.

[0005] In conclusion, while existing headphone connection structures meet the wearing adjustment requirements to a certain extent, they are insufficient in terms of stability and durability. Utility Model Content

[0006] To overcome the shortcomings mentioned above, this utility model aims to provide a technical solution that can solve the above problems.

[0007] A headphone earcup connecting frame fixing structure includes an earcup body and a connecting frame. The earcup body includes an audio module, a front cover with a hearing hole, and a rear protective cover. The front cover with a hearing hole and the rear protective cover cover are closed together. The audio module is disposed in the front cover with a hearing hole and the rear protective cover cover. After the front cover with a hearing hole and the rear protective cover cover are closed together, a connecting groove with an inward structure is formed between the two. Rotating holes are respectively provided on both sides of the earcup body corresponding to the connecting groove.

[0008] The connecting frame includes an upper head beam connecting part, an arc-shaped part formed in the lower part of the head beam connecting part and corresponding to the connecting groove, and a rotating shaft part formed in the end of the arc-shaped part and connected to the rotating shaft hole. A blocking part is also formed on the connecting groove, which is used to block the arc-shaped part to prevent the rotating shaft part from disengaging from the rotating shaft hole.

[0009] Preferably, the connecting groove has a groove bottom and two groove sides corresponding to the two sides of the groove bottom. The groove bottom is provided on the front cover or rear protective cover with a listening hole, the pivot hole is provided on the groove bottom, and the two groove sides are respectively provided on the front cover with a listening hole and the rear protective cover.

[0010] Preferably, the shielding part is formed on the front cover with the hearing hole, and when the bottom of the groove is set on the front cover with the hearing hole, the shielding part is open at the position of the corresponding pivot hole, so that before the rear protective cover is closed, the pivot part can be inserted into the pivot hole along this position and then rotated to align the arc-shaped part with the connecting groove.

[0011] Preferably, the shielding part is formed on the rear protective cover, and when the bottom of the groove is set on the rear protective cover, the shielding part is open at the position of the corresponding pivot hole, so that before the rear protective cover is closed, the pivot part can be inserted into the pivot hole along the position and then rotated to align the arc-shaped part with the connecting groove.

[0012] Preferably, the shielding part has a plurality of shielding pieces distributed at intervals between each other. When the shielding part is openly arranged at the position of the corresponding pivot hole, the shielding part is positioned exactly between two adjacent shielding pieces at the position of the corresponding pivot hole.

[0013] Preferably, the shielding portion is openly positioned at the upper part of the earpiece body so that the headband connection portion can extend along that position.

[0014] Preferably, a wire-passing hole for wiring the audio module is provided inside the connecting groove, and the wire-passing hole is located at the upper part of the earphone body.

[0015] Preferably, the lower part of the connecting groove is provided with a wiring port, and the shielding part is fitted with the wiring port.

[0016] Preferably, a reinforcing part is formed at the location where the pivot hole is provided inside the earpiece body, and the pivot hole is isolated from the interior of the earpiece body through the reinforcing part.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] The design, incorporating connecting grooves, pivot holes, curved sections, and pivots, ensures a more secure connection between the earpiece body and the connecting frame. Compared to traditional connection methods, this structure provides mutual restraint among components when subjected to tensile forces, reducing the likelihood of loosening due to tension. The unique splicing structure of the bottom and sides of the connecting groove further enhances the enclosure and fixation of the connecting frame after closing, improving the overall stability of the connection.

[0019] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of this utility model assembled on the head beam;

[0022] Figure 2 This is a schematic diagram of the structure of Embodiment 1 of this utility model;

[0023] Figure 3 This is a schematic diagram of the disassembled structure of Embodiment 1 of this utility model;

[0024] Figure 4 This is a schematic diagram of the structure of Embodiment 2 of this utility model assembled on the head beam;

[0025] Figure 5 This is a structural schematic diagram of Embodiment 2 of the present invention;

[0026] Figure 6 This is a schematic diagram of the disassembled structure of Embodiment 2 of this utility model.

[0027] The reference numerals and names in the figure are as follows:

[0028] The earcup body 10, audio module 11, front cover with hearing hole 12, rear protective cover 13, connecting groove 14, bottom of groove 141, side of groove 142, pivot hole 15, wire hole 16, connection port 17, shielding part 18, reinforcing part 19, connecting frame 20, headband connecting part 21, arc-shaped part 22, pivot part 23. Detailed Implementation

[0029] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0030] Please see Figure 1-6 In this embodiment of the present invention, an earcup connecting frame fixing structure for a headset includes an earcup body 10 and a connecting frame 20. The earcup body 10 includes an audio module 11, a front cover 12 with a hearing hole, and a rear protective cover 13. The front cover 12 with a hearing hole and the rear protective cover 13 cover each other. The audio module 11 is disposed in the front cover 12 with a hearing hole and the rear protective cover 13. After the front cover 12 with a hearing hole and the rear protective cover 13 are covered, a connecting groove 14 with an inward structure is formed between the two. A pivot hole 15 is respectively provided on both sides of the earcup body 10 corresponding to the connecting groove 14.

[0031] The connecting frame 20 includes an upper head beam connecting part 21, an arc-shaped part 22 formed in the lower part of the head beam connecting part 21 and corresponding in the connecting groove 14, and a rotating shaft part 23 formed at the end of the arc-shaped part 22 and mating with the rotating shaft hole 15. A blocking part 18 is also formed on the connecting groove 14. The blocking part 18 is used to block the arc-shaped part 22 to prevent the rotating shaft part 23 from disengaging from the rotating shaft hole 15.

[0032] The connecting groove 14 has a groove bottom 141 and two groove sides 142 corresponding to the two sides of the groove bottom 141. The groove bottom 141 is provided on the front cover 12 with a listening hole or the rear protective cover 13. The rotating shaft hole 15 is provided on the groove bottom 141. The two groove sides 142 are respectively provided on the front cover 12 with a listening hole and the rear protective cover 13.

[0033] In the above technical solution, the connecting groove 14 has a groove bottom 141 and two groove sides 142 corresponding to the sides of the groove bottom 141. The groove bottom 141 can be set on the front cover 12 with a listening hole or the rear protective cover 13. Here, it is assumed that the groove bottom 141 is set on the front cover 12 with a listening hole. The audio module 11 is placed in the reserved position inside the front cover 12 with a listening hole, ensuring that the line connection port and other parts of the audio module 11 are in a suitable state for subsequent connection. The two groove sides 142 are respectively set on the front cover 12 with a listening hole and the rear protective cover 13. On the front cover 12 with a listening hole, the groove side 142 is connected to the groove bottom 141, and the groove side 142 on the rear protective cover 13 is spliced ​​with the corresponding part on the front cover 12 with a listening hole to form a complete connecting groove 14 structure when the cover is closed. At the same time, a pivot hole 15 is pre-set on the groove bottom 141. This pivot hole 15 will be used to connect the pivot part 23 of the connecting frame 20.

[0034] The assembly process is as follows:

[0035] The arc-shaped portion 22 of the connecting bracket 20 is inserted into the preset position of the connecting groove 14 of the front cover with the hearing hole 12, ensuring that the arc-shaped portion 22 can be smoothly inserted and accurately positioned. At this time, the front cover with the hearing hole 12 has not yet been closed with the rear protective cover 13. Then, the pivot portion 23 at the end of the connecting bracket 20 is aligned with the pivot hole 15 at the bottom 141 of the groove of the front cover with the hearing hole 12, so that the pivot portion 23 is accurately inserted into the pivot hole 15, achieving a preliminary connection. Then, the rear protective cover 13 is closed with the front cover with the hearing hole 12 with the connecting bracket 20 already connected. As the rear protective cover 13 is closed, the groove side portion 142 on the rear protective cover 13 and the groove side portion 142 on the front cover with the hearing hole 12 are spliced ​​together to form a complete concave connecting groove 14, which completely accommodates the arc-shaped portion 22 of the connecting bracket 20. At the same time, the shielding part 18 formed on the rear protective cover 13 will naturally shield the arc-shaped part 22 of the connecting frame 20, restricting the connecting frame 20 between the connecting groove 14 and the shielding part 18, preventing the pivot part 23 from coming out of the pivot hole 15.

[0036] Next, assemble the entire structure onto the head beam. Prepare the head beam with an insert-type connection structure. Taking the steel frame structure shown in the figure as an example, the head beam connection part 21 has an insertion groove adapted to the steel frame. This insertion groove extends along the length of the head beam, and the groove wall is provided with a locking groove or limiting structure for fixing and adjusting the position. Align one end of the steel frame, which serves as the head beam connection part 21, with the opening of the insertion groove on the head beam, ensuring that the insertion end of the steel frame perfectly matches the shape of the insertion groove. Then insert the steel frame into the groove. As the steel frame gradually goes deeper into the insertion groove, you will feel the resistance from the locking groove or limiting structure. After the steel frame is inserted, adjust its position on the head beam according to the actual usage requirements.

[0037] Therefore, the coordinated design of the connecting groove 14, the pivot hole 15, the arc-shaped part 22, and the pivot part 23 makes the connection between the earpiece body 10 and the connecting frame 20 more stable. Compared with traditional connection methods, this structure, when subjected to tensile force, has mutual restraint between the components, reducing the possibility of loosening due to pulling. The unique splicing structure of the bottom 141 and the side 142 of the connecting groove 14 further enhances the wrapping and fixing effect on the connecting frame 20 after closing, improving the overall stability of the connection.

[0038] After the earcup body 10 is closed, the shielding part 18 and the connecting groove 14 work together to effectively prevent the hinge part 23 from coming out of the hinge hole 15. Even when the user frequently adjusts the distance between the earcup and the headband and moves the connecting frame 20 by grasping the earcup, the connecting frame 20 and the earcup body 10 can always remain connected, which greatly improves the durability of the headphones.

[0039] The concave design of the connecting slot 14 and the corresponding shapes of each part of the connecting frame 20 make the overall structural layout more compact and reasonable. This not only makes space utilization more efficient but also enhances the appearance and streamlines the headphones, improving the overall quality of the product. The unique component arrangement of the connecting slot 14, while ensuring functionality, also optimizes the internal space layout of the earcup body 10, providing more reasonable placement space for other components such as the audio module 11.

[0040] Furthermore, regarding the setting of the pivot hole 15, this technical solution further proposes to form a reinforcing part 19 at the position where the pivot hole 15 is set inside the earpiece body 10, and the pivot hole 15 is isolated from the interior of the earpiece body 10 through the reinforcing part 19.

[0041] By providing the reinforcing part 19, after the pivot part 23 is inserted into the pivot hole 15, the portion of the pivot part 23 located inside the pivot hole 15 is isolated from the inside of the earphone body 10. This design prevents dust, water, and other substances from entering the inside of the earphone body 10 along the pivot hole 15, thereby creating a more enclosed space inside the earphone body 10 and improving the dustproof and waterproof effect. In addition, through this design, the pivot part 23 will basically maintain its shaft-like structure when extending into the pivot hole 16, and cannot use tilting, hook-shaped, or other structures to hook into the inside of the earphone body 10 after penetrating the pivot hole 16. This further highlights the reinforcing effect of the shielding part 18 on the connection between the connecting frame 20 and the earphone body 10.

[0042] To more clearly illustrate the technical solution of this utility model, two specific embodiments will be described below:

[0043]

Example 1

[0044] Please refer to Figure 1-3 The shielding part 18 is formed on the front cover 12 with the listening hole. When the bottom 141 of the groove is set on the front cover 12 with the listening hole, the shielding part 18 is open at the position corresponding to the pivot hole 15. This allows the pivot part 23 to be inserted into the pivot hole 15 along this position before the rear protective cover 13 is closed, and then the arc-shaped part 22 can be aligned with the connecting groove 14 by rotation. This greatly simplifies the assembly process. In the early stage of assembly, when the rear protective cover 13 is not closed, the operator can easily insert the pivot part 23 of the connecting bracket 20 into the pivot hole 15 through this open position, and then rotate the connecting bracket 20 to smoothly place the arc-shaped part 22 into the connecting groove 14. This design avoids the assembly difficulties of the traditional closed structure, significantly improves production efficiency, and reduces assembly difficulty and the probability of errors.

[0045] The shielding part 18 has multiple shielding plates (not shown in the figure) spaced apart from each other. When the shielding part 18 is open at the position corresponding to the pivot hole 15, it is positioned precisely between two adjacent shielding plates at that position. These multiple spaced-apart shielding plates not only ensure the shielding function of the arc-shaped portion 22 of the connecting frame 20, but also make the open arrangement at the pivot hole 15 more reasonable. The gaps between adjacent shielding plates are precisely for the insertion of the pivot part 23. This meticulous design does not affect the overall structural stability and provides a convenient channel for assembly. Although the shielding part 18 has multiple open arrangements, the multiple spaced-apart shielding plates work together to effectively restrict the arc-shaped portion 22 of the connecting frame 20, preventing it from detaching from the connecting groove 14 and ensuring the stability of the connection structure. At the same time, this design keeps the headphone's appearance simple and smooth, and the various structural components work together more harmoniously, improving the product's aesthetics and overall quality.

[0046] The obstruction portion 18 is openly positioned at the upper part of the earpiece body 10, allowing the headband connection portion 21 to extend along this position. This design ensures that the headband connection portion 21, after being connected to the headband, can move freely without being obstructed by the obstruction portion 18, enabling flexible adjustment of the headband length. Whether in production assembly or actual user use, this ensures the proper functioning of the headband connection portion 21, enhancing product applicability.

[0047] A cable routing hole 16 for the audio module 11 is provided inside the connection slot 14, located at the upper part of the earcup body 10. This design allows the audio module 11 wiring to be arranged orderly within the connection slot 14, avoiding messy tangles and improving the rationality and safety of the wiring. Simultaneously, the cable routing hole 16 corresponds to the headband connection part 21, facilitating the connection or integration of audio wiring with the internal wiring of the headband, further optimizing the overall electrical connection structure of the headphones. A wiring port 17 is provided at the lower part of the connection slot 14, with a cover 18 that accommodates the wiring port 17. While ensuring that the cover 18 effectively blocks the arc-shaped part 22 of the connection frame 20, sufficient operating space is provided for the wiring port 17, facilitating the connection of external devices such as audio input / output cables and charging cables. The wiring port 17 can be easily operated during daily use and maintenance, improving the product's practicality.

[0048]

Example 2

[0049] Please refer to Figure 4-6The shielding part 18 is formed on the rear protective cover 13. When the bottom of the groove 141 is set on the rear protective cover 13, the shielding part 18 is open at the position corresponding to the pivot hole 15. This allows the pivot part 23 to be inserted into the pivot hole 15 along this position before the rear protective cover 13 is closed, and then the arc-shaped part 22 is aligned with the connecting groove 14 by rotation. In the early stage of assembly, before the rear protective cover 13 is closed with the front cover 12 with the ear hole, the operator can easily insert the pivot part 23 of the connecting bracket 20 into the pivot hole 15 through this open position, and then rotate the connecting bracket 20 to make the arc-shaped part 22 smoothly align with the connecting groove 14. This design breaks through the assembly obstacles of the traditional closed structure, greatly improves production efficiency, and reduces assembly difficulty and error probability. In addition, the design of the shielding part 18 being formed on the rear protective cover 13 provides another design idea and choice compared to forming it on the front cover 12 with the ear hole. In actual production, depending on different material properties, process requirements or product positioning, the shielding part 18 can be flexibly set on the front cover 12 with the listening hole or the rear protective cover 13, which enhances the adaptability and flexibility of product design.

[0050] The shielding part 18 has multiple shielding plates spaced apart from each other. When the shielding part 18 is open at the position corresponding to the pivot hole 15, it is positioned precisely between two adjacent shielding plates at that position. At the corresponding position of the pivot hole 15, the gap between two adjacent shielding plates provides a channel for the insertion of the pivot part 23, ensuring effective shielding of the arc-shaped portion 22 of the connecting frame 20 by the shielding part 18 without affecting the overall structural stability, thus optimizing the assembly process. Although the shielding part 18 has multiple open positions, the multiple spaced shielding plates work together to effectively restrict the arc-shaped portion 22 of the connecting frame 20, preventing it from detaching from the connecting groove 14 and ensuring the stability of the connection structure. At the same time, this design maintains the simple and smooth appearance of the headphones, making the various structural components more coordinated and improving the product's aesthetics and overall quality.

[0051] The obstruction portion 18 is openly positioned at the upper part of the earpiece body 10, allowing the headband connection portion 21 to extend along this position. This ensures that the headband connection portion 21 can move freely after being connected to the headband without being obstructed by the obstruction portion 18, enabling flexible adjustment of the headband length. Whether during production and assembly or in daily use, this ensures the proper functioning of the headband connection portion 21, enhancing product applicability.

[0052] A cable routing hole 16 for the audio module 11 is provided inside the connection slot 14, located at the upper part of the earcup body 10. This design allows the audio module 11 wiring to be arranged in an orderly manner within the connection slot 14, avoiding messy tangles and improving the rationality and safety of the wiring. The cable routing hole 16 is positioned corresponding to the headband connection part 21, facilitating the connection or integration of audio wiring with the internal wiring of the headband, further optimizing the overall electrical connection structure of the headphones. A wiring port 17 is provided at the lower part of the connection slot 14, and the shielding part 18 is positioned to accommodate the wiring port 17. While ensuring that the shielding part 18 effectively shields the arc-shaped part 22 of the connection frame 20, sufficient operating space is provided for the wiring port 17, making it convenient for users to connect external devices such as audio input / output cables and charging cables. The wiring port 17 can be easily operated during daily use and maintenance, improving the practicality of the product.

[0053] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention.

Claims

1. A fixing structure for the earcup connector of a headset, characterized in that, The device includes an earphone body (10) and a connecting frame (20). The earphone body (10) includes an audio module (11), a front cover with a hearing hole (12) and a rear protective cover (13). The front cover with a hearing hole (12) and the rear protective cover (13) are closed together. The audio module (11) is disposed in the front cover with a hearing hole (12) and the rear protective cover (13). After the front cover with a hearing hole (12) and the rear protective cover (13) are closed together, a connecting groove (14) with an inward structure is formed between them. A pivot hole (15) is provided on both sides of the earphone body (10) corresponding to the connecting groove (14). The connecting frame (20) includes an upper head beam connecting part (21), an arc-shaped part (22) formed in the lower part of the head beam connecting part (21) and corresponding in the connecting groove (14), and a rotating shaft part (23) formed at the end of the arc-shaped part (22) and connected to the rotating shaft hole (15). A blocking part (18) is also formed on the connecting groove (14). The blocking part (18) is used to block the arc-shaped part (22) to prevent the rotating shaft part (23) from disengaging from the rotating shaft hole (15).

2. The earcup connecting frame fixing structure for a headset according to claim 1, characterized in that, The connecting groove (14) has a groove bottom (141) and two groove sides (142) corresponding to the two sides of the groove bottom (141). The groove bottom (141) is provided on the front cover (12) with a listening hole or the rear protective cover (13). The rotating shaft hole (15) is provided on the groove bottom (141). The two groove sides (142) are respectively provided on the front cover (12) with a listening hole and the rear protective cover (13).

3. The earcup connecting frame fixing structure for a headset according to claim 2, characterized in that, The shielding part (18) is formed on the front cover (12) with the hearing hole, and when the bottom of the groove (141) is set on the front cover (12) with the hearing hole, the shielding part (18) is open at the position corresponding to the pivot hole (15) so that before the rear protective cover (13) is closed, the pivot part (23) can be inserted into the pivot hole (15) along this position and then rotated to align the arc-shaped part (22) with the connecting groove (14).

4. The earcup connecting frame fixing structure for a headset according to claim 2, characterized in that, The shielding part (18) is formed on the rear protective cover (13), and when the bottom of the groove (141) is set on the rear protective cover (13), the shielding part (18) is open at the position corresponding to the pivot hole (15), so that before the rear protective cover (13) is closed, the pivot part (23) can be inserted into the pivot hole (15) along this position and then rotated to align the arc-shaped part (22) with the connecting groove (14).

5. The earcup connecting frame fixing structure for a headset according to any one of claims 3-4, characterized in that, The shielding part (18) has a plurality of shielding pieces that are spaced apart from each other. When the shielding part (18) is openly arranged at the position of the corresponding pivot hole (15), the shielding part (18) is positioned exactly between two adjacent shielding pieces at the position of the corresponding pivot hole (15).

6. The earcup connecting frame fixing structure for a headset according to claim 5, characterized in that, The shield (18) is openly positioned at the upper part of the earpiece body (10) so that the headband connection (21) can extend along that position.

7. The earcup connecting frame fixing structure for a headset according to claim 5, characterized in that, Inside the connecting slot (14) is a wire hole (16) for wiring the audio module (11), and the wire hole (16) is located at the upper part of the earphone body (10).

8. The earcup connecting frame fixing structure for a headset according to claim 1, characterized in that, The lower part of the connecting groove (14) is provided with a wiring port (17), and the shielding part (18) and the wiring port (17) are fitted together.

9. A headphone earcup connector fixing structure according to any one of claims 1, 2, 3, 4, 6, 7 or 8, characterized in that, A reinforcing part (19) is formed at the position where the pivot hole (15) is provided inside the earpiece body (10), and the pivot hole (15) is isolated from the interior of the earpiece body (10) through the reinforcing part (19).

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