Wireless headphone connector
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-08
- Publication Date
- 2026-08-14
AI Technical Summary
但CNC加工成本与金属材料的成本较高,由于所述第一传导部、所述第二传导部与所述绝缘本体之间在射出成型后可能产生天然接缝,导致结合界面密封性不足
[0018]所述第一本体部的所述第一电镀层与所述第二电镀层的表面与所述第二本体部的外表面连续且无明显段差。所述第一电镀层连续地分布于所述界面与所述第一接触部,因此所述界面与所述第一接触部保持电气导通。两所述凸柱固定于所述第一本体部的两所述凹口内,以增强所述第一本体部与所述第二本体部之间的塑胶结合力。所述凸部固定于所述第一本体部的所述凹部内,以增强所述第一本体部与所述第二本体部之间的塑胶结合力。所述第二本体部透过两所述凹槽减少局部料厚,有效抑制成型时因冷却收缩所造成的缩水现象,提升成型质量。所述防尘部的所述网状材料抵靠在数个所述凸台,数个所述凸台用于避免所述防尘部的所述网状材料向后凹陷。数个所述排气通道用于改善成型过程中的排气效果,避免点胶时所述胶体的底部产生困气,导致所述胶体内部空洞,进而影响防水效果。因此本实用新型无线耳机连接器能减少成本且密封性佳。
Smart Images

Figure CN224638155U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a wireless headphone connector, and more particularly to a wireless headphone connector that reduces costs and provides excellent sealing. Background Technology
[0002] Previous wireless Bluetooth headset connectors used CNC (Computer Numerical Control) to machine integral conductive and grounding terminals. However, during the electroplating process, the solder joint areas of the conductive and grounding terminals needed to be masked before rhodium-ruthenium plating could be performed. Afterward, the masking solution was washed away from the solder joint areas to achieve a gold plating on the surface of the solder joint areas, while the surface of the remaining areas was plating with rhodium-ruthenium.
[0003] Chinese Patent Publication No. 217036124 discloses "a wireless headphone connector", comprising an insulating body having a downwardly recessed receiving space, the sidewall of the receiving space having two outwardly penetrating openings, and the wall surface of the receiving space having two recessed first grooves; a first conductive portion disposed in the insulating body, with a portion of the first conductive portion exposed through one of the openings, and a first solder portion disposed in the first groove at a free end of the first conductive portion; a second conductive portion disposed in the insulating body, with a portion of the second conductive portion exposed through the other opening, and a second solder portion disposed in the other first groove at a free end of the second conductive portion; a first contact portion disposed in one of the openings and connected to the first conductive portion by spot welding; and a second contact portion disposed in the other opening and connected to the second conductive portion by spot welding.
[0004] However, the first and second conductive parts of the aforementioned wireless earphone connector are made of metal, manufactured by CNC machining, and then integrally formed with the insulating body through injection molding. However, CNC machining and metal materials are costly, and natural seams may form between the first and second conductive parts and the insulating body after injection molding, resulting in insufficient sealing at the bonding interface.
[0005] Therefore, it is necessary to provide a wireless headphone connector that reduces costs and provides excellent sealing. Summary of the Invention
[0006] The purpose of this invention is to provide a wireless headphone connector that addresses the defects and shortcomings of existing technologies.
[0007] To achieve the above objectives, this utility model discloses a wireless earphone connector, comprising: an insulating body having a first body portion and a second body portion, the first body portion and the second body portion being interlocked; the first body portion having an interface, a first base portion, a second base portion, a first contact portion, a second contact portion, a first electroplating layer and a second electroplating layer; the first base portion and the second base portion being respectively provided on both sides of the interface; the first contact portion and the second contact portion being respectively provided on the outer surfaces of the first base portion and the second base portion; the first contact portion and the second contact portion being mirror images of each other; the first electroplating layer being electroplated on the interface, the first base portion and the first contact portion; the second electroplating layer being electroplated on the second base portion and the second contact portion; the first electroplating layer and the second electroplating layer being electrically insulated from each other; a bracket disposed within the insulating body; and an adhesive disposed between the bracket and the insulating body.
[0008] As a further improvement, the second body portion has a bottom, and the periphery of the upper surface of the bottom extends upward to form a body. The left and right sides of the body are recessed downward to form two receiving grooves, and the first base portion and the second base portion of the first body portion are fixed in the two receiving grooves.
[0009] As a further improvement, the inner bottom surfaces of the first base and the second base are recessed upward to form two notches, and the two sides of the bottom of the second body extend upward to form two protrusions. The two protrusions are disposed in the two receiving grooves and fixed in the two notches.
[0010] As a further improvement, the second body part has an opening at the front of the body that penetrates the body, and the interface of the first body part is mounted on the opening.
[0011] As a further improvement, the bottom surface of the interface is recessed upward to form a recess, and the bottom of the second body portion extends forward to form a protrusion. The protrusion is formed behind the opening and is fixed inside the recess.
[0012] As a further improvement, the upper surface of the bottom of the second body extends upward on both sides to form side walls, and the bracket is fixed between the two side walls.
[0013] As a further improvement, the inner surfaces of the two sidewalls are provided with two grooves, and the colloid is filled in the two grooves.
[0014] As a further improvement, a wireless earphone connector is provided, comprising: an insulating body having an interface penetrating the insulating body; a bracket disposed within the insulating body, the bracket having a main body portion, a through hole, a connecting wall, a plurality of protrusions, and a dustproof portion, the connecting wall being provided on one side of the main body portion, the through hole being formed on one side of the main body portion, the through hole penetrating the connecting wall, the plurality of protrusions being formed by the inner surface of the through hole extending inward, the dustproof portion being mounted on the connecting wall and abutting against the plurality of protrusions, the through hole corresponding to and communicating with the interface, and the dustproof portion being located between the through hole and the interface; and an adhesive filling the space between the insulating body and the bracket.
[0015] As a further improvement, the dustproof part is provided with a mesh material and a pressure-sensitive adhesive. The mesh material abuts against several of the protrusions, and the pressure-sensitive adhesive is disposed on the side of the mesh material and adheres to the connecting wall.
[0016] As a further improvement, a wireless earphone connector is provided, comprising: an insulating body having a receiving space and an interface, the receiving space being formed inside the insulating body, the interface penetrating the insulating body and communicating with the receiving space; a bracket disposed within the insulating body, the bracket having a through hole penetrating the bracket, the through hole being aligned with and communicating with the interface, the outer surface of the bracket extending to form a plurality of protrusions, the protrusions being located between the surfaces of the bracket and the receiving space, and an exhaust channel being formed between two adjacent protrusions; and an adhesive filling the space between the surfaces of the bracket and the receiving space, the adhesive covering the protrusions and filling the exhaust channel.
[0017] As described above, this utility model's wireless earphone connector features an innovative structural design. The insulating body is formed by combining the first body portion and the second body portion using a double-shot molding technique. The first body portion is plated and used to achieve electrical functions. The front ends of the outer surfaces of the first and second base portions are recessed inward to form two positioning holes. These positioning holes facilitate electroplating of the insulating body using an electroplating device (not shown). The first and second contact portions are mirror images of each other; simply swapping their positions allows for left-right orientation structures in this utility model's wireless earphone connector, thereby simplifying the structural design and reducing manufacturing costs.
[0018] The surfaces of the first and second electroplated layers of the first body portion are continuous with the outer surface of the second body portion without significant step differences. The first electroplated layer is continuously distributed between the interface and the first contact portion, thus maintaining electrical conductivity between the interface and the first contact portion. The two protrusions are fixed within the two recesses of the first body portion to enhance the plastic bonding force between the first body portion and the second body portion. The protrusions are fixed within the recesses of the first body portion to enhance the plastic bonding force between the first body portion and the second body portion. The second body portion reduces local material thickness through the two grooves, effectively suppressing shrinkage caused by cooling shrinkage during molding and improving molding quality. The mesh material of the dustproof portion abuts against several protrusions, which prevent the mesh material of the dustproof portion from sinking backward. Several venting channels improve the venting effect during molding, preventing trapped air from forming at the bottom of the adhesive during dispensing, which would lead to voids inside the adhesive and affect the waterproof effect. Therefore, the wireless headphone connector of this utility model can reduce costs and has excellent sealing performance. Attached Figure Description
[0019] Figure 1 This is a perspective view of the wireless headphone connector of this utility model.
[0020] Figure 2 This is another perspective view of the wireless headphone connector of this utility model.
[0021] Figure 3 This is an exploded view of the wireless headphone connector of this utility model.
[0022] Figure 4 This is an exploded view of the wireless headphone connector of this utility model from another angle.
[0023] Figure 5 This is an exploded view of the insulating body of the wireless headphone connector of this utility model.
[0024] Figure 6 This is an exploded view of the insulating body of the wireless headphone connector of this utility model from another angle.
[0025] Figure 7 This is a schematic diagram of the first and second electroplating layers of the wireless earphone connector of this utility model.
[0026] The labels in the attached figures are explained as follows.
[0027] Wireless headphone connector 100 Insulating body 1
[0028] First Body Section 11 Interface 111
[0029] Solder foot 1120 First base 1121
[0030] Second base 1122 Notch 113
[0031] Recess 114 Positioning hole 115
[0032] First contact part 116 Second contact part 117
[0033] First electroplating layer 118 Second electroplating layer 119
[0034] Second body part 12, bottom 120
[0035] Body 121 Receiving slot 122
[0036] Opening 123, Protruding post 124
[0037] Projection 125 Side wall 126
[0038] Recess 127, Accommodation space 13
[0039] Support 2 Main body 21
[0040] Encased wall 22 Through hole 23
[0041] Connecting wall 24, boss 25
[0042] 26 bumps, 27 exhaust channels
[0043] Dustproof section 28 Mesh material 281
[0044] Pressure-sensitive adhesive 282, colloid 3
[0045] Protective film 4, cut 41
[0046] Gap 42, handle 43. Detailed Implementation
[0047] To explain in detail the technical content, structural features, objectives and effects of the wireless headphone connector 100 of this utility model, the following embodiments are provided in conjunction with the accompanying drawings.
[0048] Please see Figures 1 to 4 The wireless earphone connector 100 of this utility model includes an insulating body 1, a bracket 2, and an adhesive 3. The bracket 2 is fixed inside the insulating body 1. The adhesive 3 covers the front end and left and right sides of the bracket 2 and is disposed between the bracket 2 and the insulating body 1. The adhesive 3 is used to fill the gap between the bracket 2 and the insulating body 1 to prevent water from flowing into the wireless earphone connector 100 and causing damage to it.
[0049] Please see Figures 3 to 6 The insulating body 1 has a first body portion 11 and a second body portion 12. The first body portion 11 and the second body portion 12 are interlocked. In this embodiment, the insulating body 1 is formed by combining the first body portion 11 and the second body portion 12 into one piece using a two-shot molding technique, but this is not limited to specific implementations. In this embodiment, the first body portion 11 is made of plated ABS resin, and the second body portion 12 is made of PC resin. The plated nature of the first body portion 11 is used to realize electrical functions. The upper surface of the insulating body 1 is recessed downward to form an accommodating space 13. The support 2 is disposed in the accommodating space 13.
[0050] The first body portion 11 is provided with an interface 111, a first base 1121, a second base 1122, two recesses 113, a recess 114, two positioning holes 115, a first contact portion 116, a second contact portion 117, a first electroplated layer 118, and a second electroplated layer 119. The interface 111 is located at the corresponding mechanism position of the second body portion 12. The left and right sides of the interface 111 extend rearward to form the first base 1121 and the second base 1122, respectively. The first base 1121 and the second base 1122 are fixed in the corresponding mechanism of the second body portion 12, so that the first body portion 11 and the second body portion 12 constitute the insulating body 1.
[0051] The inner bottom surfaces of the first base 1121 and the second base 1122 are recessed upwards to form two recesses 113. A corresponding mechanism of the second body portion 12 is fixed within the two recesses 113 to enhance the plastic bonding force between the first body portion 11 and the second body portion 12. The bottom surface of the interface 111 is recessed upwards to form a recess 114. A corresponding mechanism of the second body portion 12 is fixed within the recess 114 to enhance the plastic bonding force between the first body portion 11 and the second body portion 12.
[0052] The front ends of the outer surfaces of the first base 1121 and the second base 1122 are recessed inward to form two positioning holes 115. The two positioning holes 115 facilitate the use of an electroplating device (not shown) to clamp the insulating body 1 for electroplating.
[0053] The rear ends of the outer surfaces of the first base 1121 and the second base 1122 extend outward to form the first contact portion 116 and the second contact portion 117, respectively. The first contact portion 116 and the second contact portion 117 are mirror images of each other. In specific implementations, only the positions of the first contact portion 116 and the second contact portion 117 need to be interchanged to achieve the left and right directional structure of the wireless headphone connector 100 of this utility model, thereby simplifying the structural design and reducing manufacturing costs. For example, when the first contact portion 116 is set as a power terminal to contact an external power terminal, the second contact portion 117 can be set as a ground terminal to contact an external ground terminal. Alternatively, when the first contact portion 116 is set as a ground terminal to contact an external ground terminal, the second contact portion 117 can be set as a power terminal to contact an external power terminal.
[0054] Please see Figure 7 In this embodiment, the first electroplated layer 118 is electroplated at the interface 111, the first base 1121, and the first contact portion 116. The plating surface of the first body portion 11 is continuous with the outer surface of the second body portion 12 without any significant step difference. Furthermore, the first electroplated layer 118 is continuously distributed between the interface 111 and the first contact portion 116, thus maintaining electrical conductivity between the interface 111 and the first contact portion 116. The second electroplated layer 119 is electroplated at the second base 1122 and the second contact portion 117. The plating surface of the first body portion 11 is continuous with the outer surface of the second body portion 12 without any significant step difference. The first electroplated layer 118 and the second electroplated layer 119 are separated from each other, thus forming electrical insulation between them.
[0055] The upper surfaces of the first base 1121 and the second base 1122 extend upward to form two solder feet 1120. The first electroplating layer 118 and the second electroplating layer 119 are respectively electroplated on the two solder feet 1120. When the wireless earphone connector 100 of this utility model is installed on a wireless Bluetooth earphone (not shown in the figure), the two solder feet 1120 are respectively connected to the positive and negative terminals of the wireless Bluetooth earphone (not shown in the figure).
[0056] When the wireless Bluetooth headset (not shown) is placed in a charging case (not shown), the power terminal and ground terminal of the charging case (not shown) come into contact with the first electroplated layer 118 of the first contact portion 116 and the second electroplated layer 119 of the second contact portion 117, respectively. This allows the charging case (not shown) to charge the wireless Bluetooth headset (not shown).
[0057] The second body portion 12 is provided with a bottom 120, a body 121, two receiving grooves 122, an opening 123, two protrusions 124, a protrusion 125, two side walls 126, and two recesses 127. In this embodiment, the bottom 120 is arc-shaped. The periphery of the upper surface of the bottom 120 extends upward to form the body 121. The left and right sides of the body 121 are recessed downward to form the two receiving grooves 122. The first base portion 1121 and the second base portion 1122 of the first body portion 11 are respectively fixed in the two receiving grooves 122, so that the first body portion 11 and the second body portion 12 constitute the insulating body 1. The front of the body 121 of the second body portion 12 is provided with an opening 123 penetrating through the middle of the front body 121. The interface 111 of the first body portion 11 is installed at the position of the opening 123.
[0058] Two protrusions 124 extend upward from the left and right sides of the bottom 120 of the second body portion 12. The two protrusions 124 are disposed within the two receiving grooves 122. The two protrusions 124 are fixed within the two recesses 113 of the first body portion 11 to enhance the plastic bonding force between the first body portion 11 and the second body portion 12. A protrusion 125 extends forward from the bottom 120 of the second body portion 12. The protrusion 125 is formed behind the opening 123. The protrusion 125 is fixed within the recesses 114 of the first body portion 11 to enhance the plastic bonding force between the first body portion 11 and the second body portion 12.
[0059] The second body portion 12 extends upward from the left and right sides of the upper surface of the bottom 120 to form two sidewalls 126. The bracket 2 is fixed between the two sidewalls 126. The inner surfaces of the two sidewalls 126 are provided with two grooves 127. The second body portion 12 reduces local material thickness through the two grooves 127, effectively suppressing shrinkage caused by cooling shrinkage during molding and improving molding quality. The colloid 3 fills the two grooves 127.
[0060] Please see Figure 3 and Figure 4The bracket 2 comprises a main body 21, a covering wall 22, a through hole 23, a connecting wall 24, several protrusions 25, several protrusions 26, several exhaust channels 27, and a dustproof part 28. The front surface of the main body 21 extends forward to form the covering wall 22. The colloid 3 covers the front end and left and right sides of the main body 21 and the covering wall 22. The upper surface of the main body 21 is recessed downward to form the through hole 23. The through hole 23 penetrates the middle of the covering wall 22. The connecting wall 24 is formed in the middle of the covering wall 22, and the through hole 23 penetrates the middle of the connecting wall 24. The dustproof part 28 is installed at the front end of the connecting wall 24. The upper and lower ends of the middle of the connecting wall 24 extend inward to form several protrusions 25. The dustproof part 28 is installed at the front end of the connecting wall 24 and abuts against several protrusions 25.
[0061] The dustproof part 28 is provided with a mesh material 281 and two pressure-sensitive adhesives 282. The dustproof part 28 is used to prevent dust from entering the wireless Bluetooth headset (not shown) through the through hole 23, and external sound can enter the wireless Bluetooth headset (not shown) through the mesh material 281 and the through hole 23. When the wireless headset connector 100 of this utility model is installed on the wireless Bluetooth headset (not shown), external sound can enter the microphone of the wireless Bluetooth headset (not shown) through the opening 123 of the second body part 12 and the through hole 23 of the bracket 2 for sound reception. The mesh material 281 of the dustproof part 28 abuts against several protrusions 25, and the several protrusions 25 are used to prevent the mesh material 281 of the dustproof part 28 from being recessed backward. The two pressure-sensitive adhesives 282 are respectively provided on the left and right ends of one side of the mesh material 281. The two pressure-sensitive adhesives 282 are attached to the left and right ends of the front surface of the connecting wall 24.
[0062] The lower surface of the main body 21 extends downward to form several protrusions 26. A venting channel 27 is formed between two adjacent protrusions 26. The bottom of the adhesive 3 corresponds to the several venting channels 27. During the dispensing process, the adhesive 3 flows along the venting channels 27. The several venting channels 27 are used to improve the venting effect during the molding process, preventing air trapping at the bottom of the adhesive 3, which could lead to voids inside the adhesive 3 and thus affect its waterproofing effect.
[0063] Please see Figures 2 to 4The wireless earphone connector 100 of this utility model also includes a protective film 4. The protective film 4 prevents scratches on the surface of the wireless earphone connector 100 during transportation and manufacturing. The protective film 4 is attached to the bottom of the insulating body 1. The protective film 4 has at least one cut 41, several notches 42, and a handle 43. In this embodiment, the protective film 4 has three cuts 41 in the middle, but this is not limited to specific implementations. Since the bottom of the insulating body 1 is arc-shaped, the cuts 41 allow the protective film 4 to fit snugly against the bottom of the insulating body 1. The periphery of the protective film 4 is recessed inward to form several notches 42. The several notches 42 prevent the protective film 4 from wrinkling, overlapping, or warping after being attached to the bottom of the insulating body 1. The front end of the protective film 4 has an upwardly extending handle 43, which facilitates the user in removing the protective film 4. In this embodiment, the handle 43 corresponds to the interface 111 of the insulating body 1, and the handle 43 covers the interface 111 of the insulating body 1.
[0064] As described above, the wireless earphone connector 100 of this utility model features an innovative structural design. The insulating body 1 is formed by combining the first body portion 11 and the second body portion 12 using a double-shot molding technique. The first body portion 11 is plated to achieve electrical functions. The front ends of the outer surfaces of the first base portion 1121 and the second base portion 1122 are recessed inward to form two positioning holes 115. These positioning holes 115 facilitate electroplating of the insulating body 1 by an electroplating device (not shown). The first contact portion 116 and the second contact portion 117 are mirror images of each other. By simply swapping the positions of the first contact portion 116 and the second contact portion 117, the left and right orientations of the wireless earphone connector 100 can be achieved, thereby simplifying the structural design and reducing manufacturing costs.
[0065] The surfaces of the first electroplated layer 118 and the second electroplated layer 119 of the first body portion 11 are continuous with the outer surface of the second body portion 12 without significant step differences. The first electroplated layer 118 is continuously distributed between the interface 111 and the first contact portion 116, thus maintaining electrical conductivity between the interface 111 and the first contact portion 116. The two protrusions 124 are fixed within the two recesses 113 of the first body portion 11 to enhance the plastic bonding force between the first body portion 11 and the second body portion 12. The protrusion 125 is fixed within the recess 114 of the first body portion 11 to enhance the plastic bonding force between the first body portion 11 and the second body portion 12. The second body portion 12 reduces local material thickness through the two grooves 127, effectively suppressing shrinkage caused by cooling shrinkage during molding and improving molding quality. The mesh material 281 of the dustproof part 28 abuts against several protrusions 25, which prevent the mesh material 281 of the dustproof part 28 from sinking backward. Several venting channels 27 improve the venting effect during the molding process, preventing trapped air from forming at the bottom of the adhesive 3 during dispensing, which could lead to voids inside the adhesive 3 and affect its waterproof performance. Therefore, the wireless headphone connector 100 of this invention reduces costs and provides excellent sealing.
Claims
1. A wireless earphone connector, characterized by, include: An insulating body comprises a first body portion and a second body portion, which are interlocked. The first body portion comprises an interface, a first base, a second base, a first contact portion, a second contact portion, a first electroplated layer, and a second electroplated layer. The first base and the second base are respectively provided on both sides of the interface. The first contact portion and the second contact portion are respectively provided on the outer surfaces of the first base and the second base. The first contact portion and the second contact portion are mirror images of each other. The first electroplated layer is electroplated on the interface, the first base, and the first contact portion. The second electroplated layer is electroplated on the second base and the second contact portion. The first electroplated layer and the second electroplated layer are electrically insulated from each other. A bracket is disposed within the insulating body. An adhesive is disposed between the bracket and the insulating body.
2. The wireless earpiece connector of claim 1, wherein: The second body portion has a bottom, and the periphery of the upper surface of the bottom extends upward to form a body. The left and right sides of the body are recessed downward to form two receiving grooves. The first base portion and the second base portion of the first body portion are fixed in the two receiving grooves.
3. The wireless earpiece connector of claim 2, wherein: The inner bottom surfaces of the first base and the second base are recessed upward to form two notches, and the two sides of the bottom of the second body extend upward to form two protrusions. The two protrusions are disposed in the two receiving grooves and fixed in the two notches.
4. The wireless earpiece connector of claim 2, wherein: The second body portion has an opening at the front of the body that penetrates the body, and the interface of the first body portion is mounted on the opening.
5. The wireless earpiece connector of claim 4, wherein: The bottom surface of the interface is recessed upward to form a recess, and the bottom of the second body part extends forward to form a protrusion. The protrusion is formed behind the opening and is fixed in the recess.
6. The wireless earpiece connector of claim 2, wherein: The upper surface of the bottom of the second body extends upward on both sides to form two side walls, and the bracket is fixed between the two side walls.
7. The wireless earpiece connector of claim 6, wherein: The inner surfaces of the two sidewalls are provided with two grooves, and the colloid is filled in the two grooves.
8. A wireless earpiece connector, characterized by include: An insulating body having an interface that penetrates the insulating body; a support disposed within the insulating body, the support having a main body, a through hole, a connecting wall, several protrusions, and a dustproof part, the connecting wall being provided on one side of the main body, the through hole being formed on one side of the main body, the through hole penetrating the connecting wall, the inner surface of the through hole extending inward to form several protrusions, the dustproof part being installed on the connecting wall and abutting against the several protrusions, the through hole corresponding to and communicating with the interface, the dustproof part being located between the through hole and the interface; and an colloid filling the space between the insulating body and the support.
9. The wireless earpiece connector of claim 8, wherein: The dustproof part is provided with a mesh material and a pressure-sensitive adhesive. The mesh material abuts against several of the protrusions, and the pressure-sensitive adhesive is disposed on the side of the mesh material and adheres to the connecting wall.
10. A wireless earpiece connector, characterized by include: An insulating body has a receiving space and an interface. The receiving space is formed inside the insulating body, and the interface penetrates the insulating body and communicates with the receiving space. A bracket is disposed in the insulating body. The bracket has a through hole that penetrates the bracket, is aligned with the interface, and communicates with the interface. Several protrusions extend from the outer surface of the bracket and are located between the surfaces of the bracket and the receiving space. An exhaust channel is formed between two adjacent protrusions. A colloid is filled between the surfaces of the support and the accommodating space, the colloid covering several of the protrusions and filling several of the venting channels.