TW202304689A - Manufacturing method for water-proof button and electronic device using the same - Google Patents

Abstract

A manufacturing method for a waterproof button and an electronic device using the same. The manufacturing method includes: providing a button substrate, in which the button substrate includes a plate, a plurality of keycaps and at least one connecting part; providing a first mold, in which the first mold includes a plurality of hollow convex columns; placing the button substrate on the first mold, in which the keycaps are correspondingly located on the hollow convex columns; providing a second mold, in which the second plate includes a plurality of grooves; pressing the second mold to the button substrate and the first mold, so that the second mold is pushed against the plate until the hollow convex columns are respectively accommodated in the grooves; injecting a soft material between the first mold and the second mold; and removing the first mold and the second mold to obtain the waterproof button.

Description

Manufacturing method of waterproof key and electronic device using the waterproof key

The present disclosure relates to a manufacturing method of a waterproof key and an electronic device using the waterproof key, especially a manufacturing method of using a mold to form a waterproof key with a waterproof layer by injection molding and an electronic device using the waterproof key.

With the continuous improvement of user experience requirements, the design requirements of handheld electronic products are also getting higher and higher. In order to prolong the service life of the product and the convenience of product use, waterproof and dustproof has become the standard configuration of many handheld electronic products.

In the prior art, for example, the waterproof transmission cover is used to perform the sealing and waterproof effect, and when the button is pressed with force, the force is transmitted to the lower tact switch through the waterproof transmission cover. The soft material of this kind of waterproof button design will be between the hard button and the touch switch, so that there may be an unclear and crisp pressing feeling, which will affect the pressing feel of the button.

In addition, most of the existing waterproof button designs cannot form multiple waterproof buttons at one time. The hard buttons are affected by the clamping of soft materials in the shell structure, and a full circle of side walls or convex ribs will be set around the opening of the shell, making the product In order to have a plurality of buttons and meet the waterproof requirement, each button needs to be molded and assembled separately, which will cause problems such as increased material molding costs and finished product assembly costs.

Furthermore, if the traditional insert molding (Insert molding) process is used to solve the problem of increasing the assembly cost of the finished product, multiple buttons need to be placed in the mold one by one when the material is molded, and then the insert molding is performed. At this time, each button is individually The assembly cost and time are only passed on to the molding cost, with little real benefit.

In view of this, the present disclosure provides a method of manufacturing a waterproof button in an embodiment, including providing a button substrate. The button substrate includes a board body, a plurality of keycaps, and at least one connecting section. The board body is provided with a plurality of openings, and the plurality of keycaps are respectively Correspondingly arranged in the plurality of openings, and each of the plurality of keycaps is connected to the plate body through at least one connecting section; a first mold is provided, the first mold includes a first base and a plurality of hollow bosses, and the plurality of hollow bosses are arranged at intervals. One surface of the base, and corresponding to the arrangement of the plurality of keycaps; placing the button substrate on the first mold, and making the plurality of keycaps correspondingly located on the plurality of hollow bosses; providing a second mold, the second mold includes a second The base and the plurality of grooves, the plurality of grooves are recessed on one surface of the second base, and are arranged corresponding to the arrangement of the plurality of keycaps; the second mold is correspondingly pressed on the key substrate and the first mold, so that the second mold The second base pushes against the board until the plurality of connecting sections are disconnected, the plurality of keycaps and the corresponding hollow protrusions are respectively accommodated in the plurality of grooves, and the board is sandwiched between the first base and the second base space; injecting soft material between the first mold and the second mold, and making the soft material cover the plate body and surround the plurality of keycaps to form a waterproof layer; and remove the first mold and the second mold to obtain waterproof keys.

Meanwhile, the present disclosure provides an electronic device in an embodiment, including a housing, a circuit board, a waterproof key, and a plurality of outer covers. The shell has a plurality of key slots, and each of the plurality of key slots has a key opening at the bottom. The circuit board is accommodated in the casing. The waterproof key is made by the aforementioned manufacturing method. The waterproof key is arranged above the circuit board and the plurality of key caps respectively pass through one of the plurality of key openings to be accommodated in the key groove. The plurality of outer covers cover the plurality of keycaps.

In this way, by using the key substrate with multiple key caps, the alignment and setting of multiple keys can be completed at one time, and after the mold is pressed and injection molded, a waterproof key with multiple keys can be formed. In addition, the waterproof key made by this manufacturing method is not completely covered by the waterproof layer on the upper and lower surfaces of the keycap, but can be directly connected to the casing (or outer cover) and the casing (or outer cover) of the electronic device located outside the waterproof layer. The circuit board located inside the waterproof layer is in contact with each other to improve the pressing feeling. Also because there is no need to place the keycaps one by one in the mold, the time and cost of manufacturing and assembling can also be greatly reduced.

The detailed features and advantages of this disclosure are described in detail below in the implementation mode, which is sufficient for any person familiar with the related art to understand the technical content of this disclosure and implement it accordingly, and according to the content disclosed in this specification, the scope of patent application and With the drawings, anyone skilled in the art can easily understand the purpose and advantages of the present disclosure.

Please refer to FIG. 1 and FIG. 2A first. FIG. 1 is a flow chart of a manufacturing method of a waterproof key according to an embodiment of the present disclosure, and FIG. 2A is a partial schematic diagram of a top side of a key substrate of a waterproof key according to an embodiment of the present disclosure. The method for manufacturing a waterproof key in this embodiment includes providing a key substrate 10 (step S10 ). The key substrate 10 includes a board body 11 , a plurality of keycaps 12 and at least one connecting segment 121 , and the board body 11 defines a plurality of openings 111 . The plurality of keycaps 12 are correspondingly disposed on the plurality of openings 111 , and each keycap 12 is connected to the board body 11 through at least one connecting section 121 . As can be seen from FIG. 2A , a keycap 12 is disposed in each opening 111 opened on the board 11 , and each keycap 12 is connected to the board 11 through four connecting sections 121 . In this embodiment, the connection section 121 is a thin rib with a small width (for example, the cross-sectional area size is 0.5mm×0.5mm), so that it is easier to cut off in the subsequent manufacturing process. This disclosure does not include the connection section 121 with this size. is limited, and the number of connecting segments 121 is not limited to four. In addition, in this embodiment, a circular keycap 12 is used as an example, but it is not limited thereto. The shape of the keycap 12 can also be oval, polygonal, irregular, etc., and can be set according to actual needs. .

Next, please also refer to FIG. 2B . FIG. 2B is a partial schematic diagram of the lower side of the key substrate of the waterproof key according to an embodiment of the present disclosure. In this embodiment, the keycaps 12 respectively include pressing posts 122 extending from the lower surface 123 of the keycap 12 .

Next, please refer to FIG. 1, FIG. 3 and FIG. 4. FIG. 3 is a schematic diagram of the first mold, the key substrate and the second mold of a waterproof button according to an embodiment of the disclosure, and FIG. 4 is a schematic diagram of a waterproof button according to an embodiment of the disclosure. A schematic cross-sectional view of the first mold, the key substrate and the second mold. Next, step S20 is executed to provide a first mold 20 . The first mold 20 includes a first base 21 and a plurality of hollow protrusions 22, and the plurality of hollow protrusions 22 are arranged at intervals on a surface 211 of the first base 21 (as seen in FIG. 4, the hollow protrusions 22 are arranged at intervals on the first The upper surface 211 of the base 21 ), and is arranged corresponding to the arrangement of the plurality of keycaps 12 .

Next, step S30 is executed to place the key substrate 10 on the first mold 20 . The plurality of keycaps 12 are correspondingly located on the plurality of hollow bosses 22 . As can be seen from FIG. 3 , a plurality of hollow bosses 22 are protruded on the upper surface of the first mold 20 . These hollow protrusions 22 are set corresponding to the arrangement of the plurality of key caps 12 on the key substrate 10, so that when the key substrate 10 is placed on the first mold 20, each key cap 12 can be placed corresponding to a hollow protrusion 22 . Further, when the key substrate 10 is placed on the first mold 20, the pressing columns 122 on the lower surface 123 of the keycap 12 respectively penetrate into the hollow parts of the corresponding hollow convex columns 22, so that the keycaps 12 respectively correspond to the hollow convex columns. twenty two. At this time, the pressing column 122 can also provide the effect of alignment, so that the center of the keycap 12 is aligned with the center of the hollow convex column 22, so as to avoid the possible offset problem when the waterproof layer 40 is formed by injecting soft materials later (details See the description of step S60).

In some embodiments, the cross-sectional peripheral shape of the hollow post 22 is the same as that of the corresponding keycap 12 , and the cross-sectional area of the hollow post 22 is smaller than that of the keycap 12 . For example, the hollow post 22 is cylindrical, and its cross-section is hollow and annular, and the outer circumference is circular, and the shape of the keycap 12 is also circular, but this disclosure is not limited thereto. The peripheral shape of the cross section can also be different from the shape of the keycap 12 .

Next, step S40 is executed to provide a second mold 30 . The second mold 30 includes a second base 31 and a plurality of grooves 32, and the plurality of grooves 32 are recessed on a surface 311 of the second base 31 (in view of FIG. 4, the grooves 32 are recessed on the second base 31 lower surface 311 ), and correspond to the arrangement of the plurality of keycaps 12 . The grooves 32 are arranged corresponding to the arrangement of the plurality of keycaps 12 on the key substrate 10 , so that when the second mold 30 is correspondingly pressed to the first mold 20 , each groove 32 corresponds to an opening 111 .

Subsequently, referring to FIG. 1 and FIG. 5 at the same time, FIG. 5 is a schematic cross-sectional action diagram of pressing the second mold of the waterproof keypad to the first mold according to an embodiment of the present disclosure. After the relative positions of the second mold 30 , the key substrate 10 and the first mold 20 are set, step S50 is performed to press-fit the second mold 30 to the key substrate 10 and the first mold 20 correspondingly. As shown in FIG. 5 , during the pressing process, when the second mold 30 is pressed down to contact the upper surface of the button substrate 10 , the second base 31 of the second mold 30 continues to push down the top plate body 11 to the connecting section 121 disconnect. Once the connection section 121 is disconnected, the board body 11 loses the connection between the connection section 121 and the keycap 12 , and will fall to the surface 211 of the first base 21 under the action of gravity.

In some embodiments, the shape of the notch of each groove 32 corresponds to the shape of the keycap 12 , and the notch is larger than the keycap 12 and smaller than the opening 111 . In this embodiment, since the keycap 12 is circular, the notch shape of the groove 32 and the shape of the opening 111 are both circular as an example. In this embodiment, the inner diameter D1 of the groove 32 is larger than the diameter D2 of the keycap 12 and smaller than the inner diameter D3 of the opening 111 . Thereby, when the second mold 30 is pressed against the first mold 20 , the second base 31 around the notch will press down along the connection section 121 between the keycap 12 and the opening 111 , thereby breaking the connection section 121 .

Subsequently, the second mold 30 continues to press down until it is shown in FIG. 6 , which is a schematic cross-sectional view of the second mold of the waterproof button according to an embodiment of the present disclosure being pressed and bonded to the first mold. As shown in FIG. 6 , the keycap 12 and the corresponding hollow post 22 are respectively accommodated in the groove 32 , and the board body 11 is sandwiched between the first base 21 and the second base 31 . At this time, the pressing distance of the second base 31 can be controlled by an automatic control method, so that it can be pressed down to a specific position, so that there is still a certain gap between the second base 31 and the first base 21, so as to facilitate subsequent softness. The filling of the material further forms the waterproof layer 40 . In addition, for example, a pressure-sensitive element can also be arranged at the bottom of the groove 32 of the second mold 30 . Once the bottom of the groove 32 touches the keycap 12 , the pressure-sensitive element is pressed and sends a signal to make the second mold 30 stop pressing down.

In addition, there is a keycap accommodating part 321 at the groove bottom of each groove 32, and the shape of the keycap accommodating part 321 is the same as that of the keycap 12 accommodated in the groove 32, and is pressed by the second mold 30. After being fitted to the key substrate 10 and the connecting section 121 is disconnected, the upper surface side of the key cap 12 is accommodated in the key cap accommodating portion 321 . The keycap accommodating part 321 can just be located in the middle of the bottom of the groove 32. Once the upper surface side of the keycap 12 is accommodated in the keycap accommodating part 321 to complete the positioning, the keycap 12 and the hollow post 22 will be surrounded by The sidewalls of the recess 32 will have equal spacing. In this way, it is also possible to avoid the slight displacement of the keycap 12 relative to the hollow post 22 when the second mold 30 presses and breaks the connecting section 121 , which further causes the problem of uneven filling and coating when soft materials are injected later.

In some embodiments, the second mold 30 further includes a plate accommodating portion 33, the plate accommodating portion 33 is recessed on the surface 311 of the second base 31, and the shape of the plate accommodating portion 33 is corresponding to the plate The shape of body 11. Therefore, when the second mold 30 is pressed onto the key substrate 10 , the plate body 11 can be limited in the plate body accommodating portion 33 , so that the entire surface of the plate body 11 can be evenly and completely covered when the subsequent soft material is injected.

In addition, when the second mold 30 is press-fitted to the first mold 20, in addition to controlling the pressing height of the second mold 30 through the aforementioned automatic control method, the second base 31 can also be made There is a certain gap with the first base 21 . As shown in FIG. 4 , a spacer column 34 is protruded between two adjacent grooves 32 in the plate body accommodating portion 33 of the second mold 30 . The spacer columns 34 are against the board body 11 , so the height of the spacer columns 34 can be used to control the size of the gap.

Subsequently, referring to FIG. 1 and FIG. 7 at the same time, FIG. 7 is a cross-sectional schematic diagram of injecting soft material between the first mold and the second mold for the waterproof button according to an embodiment of the present disclosure. Next, step S60 is executed to inject and mold the soft material between the first mold 20 and the second mold 30 . The soft material covers the board body 11 and surrounds the plurality of keycaps 12 to form a waterproof layer 40 . After the soft material is injected, the soft material will flow to fill the gap between the first base 21 and the second base 31 . These gaps include, as can be seen from FIG. 6 , the gap between the upper surface of the plate body 11 and the second base 31 , and the gap between the sidewall of the groove 32 and the hollow post 22 . Also because the soft material will fill up the gaps, a waterproof layer 40 covering the entire board body 11 and a waterproof layer 40 surrounding the entire keycap 12 (ie, the entire outer surface of the hollow post 22 ) will be formed. At this time, since the pressing column 122 is located inside the hollow convex column 22, the soft material will be blocked by the outer surface of the hollow convex column 22 when filling, and will only fill the space outside the hollow convex column 22 without entering the hollow space. Inside of the boss 22 . Since the pressing column 122 is not directly covered by the waterproof layer 40 , the mobility of the pressing column 122 can be preserved.

Subsequently, referring to FIG. 1 and FIG. 8 at the same time, FIG. 8 is a partial schematic diagram of a waterproof key according to an embodiment of the present disclosure. Next, step S70 is executed to remove the first mold 20 and the second mold 30 to obtain the waterproof key 100 . It can be seen from FIG. 8 that the waterproof key 100 obtained after completion will be formed around the entire key cap 12 . At the same time, the entire waterproof layer 40 will also cover the upper surface of the board body 11 .

In this way, once the waterproof keypad 100 is set on the circuit board and the outer cover is covered, since there is no hole or gap between the waterproof layer 40 and the keycap 12, water and moisture cannot pass between the waterproof layer 40 and the keycap. Cap 12 to enter. In addition, the manufacturing method of this embodiment utilizes the button substrate 10 with multiple keycaps 12, which can complete the alignment and setting of multiple required buttons at one time, and after mold pressing and injection molding, a plurality of buttons can be formed. The waterproof button 100 of the keycap 12. Also because there is no need to place the keycaps 12 one by one in the mold, the time and cost of manufacturing and assembling can also be greatly reduced.

It can also be seen from FIG. 8 that in the waterproof key 100 manufactured by this manufacturing method, the upper surfaces of the plurality of keycaps 12 will be exposed from the waterproof layer 40 . The lower surface of the keycap 12 also forms a hollow cylindrical waterproof layer 40 due to the arrangement of the hollow bosses 22 . Therefore, the lower surface of the keycap 12 is not completely covered by the waterproof layer 40 , but can directly contact the circuit board under the waterproof layer 40 with the touch switch through the pressing column 122 to improve the pressing feel.

Moreover, in this embodiment, the key substrate 10 is made of hard material, wherein the molding hardness of the hard material is greater than that of the soft material. In this way, the overall firmness of the waterproof button 100 can be provided, and the pressing elasticity of the waterproof button 100 due to the waterproof layer 40 made of soft materials can be maintained.

Please refer to FIG. 8 and FIG. 9 together. FIG. 9 is a partial cross-sectional schematic diagram of an electronic device according to an embodiment of the present disclosure. In order to clearly present the schematic structure of the waterproof keys 100 assembled in the electronic device 90 , only the two groups of keys are partially illustrated here. The electronic device 90 can be a handheld device such as a mobile phone, a tablet, a gamepad, etc., and the waterproof button 100 is assembled and used as, for example, a power button, a volume control button, and the like. The electronic device 90 includes a housing 91, a circuit board 92, a waterproof key 100 and a plurality of outer covers 93 (only two are shown in the figure, and the number of outer covers 93 can be set corresponding to the number of key caps 12 of the waterproof key 100). The casing 91 has a plurality of key slots 911 (only two are shown in the figure, and the number of key slots 911 can be set corresponding to the number of key caps 12 of the waterproof key 100 ), and each key slot 911 has a key opening 912 at the bottom. The circuit board 92 is accommodated in the casing 91 . The waterproof key 100 is manufactured by the aforementioned manufacturing method, and details of the detailed structure of the waterproof key 100 will not be repeated here. The waterproof key 100 is disposed above the circuit board 92 so that the key cap 12 respectively passes through one of the plurality of key openings 912 to be accommodated in the key groove 911 . The plurality of outer covers 93 respectively cover the plurality of keycaps 12 .

After the assembly is completed, the circuit board 92 will be completely located on the inner side of the waterproof layer 40, while the housing 91 will be located on the outer side of the waterproof layer 40, and the entire waterproof layer 40 will be tightly bonded to the outer circumference of the keycap 12 without any gap, so The liquid flowing down from the side of the casing 91 will not be able to enter through the waterproof button 100 , so a good waterproof effect can be provided. In addition, if the pressing column 122 is provided on the lower surface 123 of the keycap 12 of the waterproof key 100 , the pressing column 122 can be used to directly press the touch switch on the circuit board 92 . Since the pressing column 122 can directly contact the touch switch without the waterproof layer 40 , the pressing feeling can also be improved.

Furthermore, when the cross-sectional area of the hollow post 22 is smaller than the area of the keycap 12, the waterproof layer 40 will not only cover the side of the keycap 12, but also surround the keycap 12 during molding. The lower surface 123 of the keycap 12 provides certain support. Thereby, when the keycap 12 is pressed down, the waterproof layer 40 covering the keycap 12 and surrounding the bottom of the keycap 12 can also provide the elastic recovery force of the keycap 12 . Once the pressing force applied to the keycap 12 disappears, the keycap 12 can return to the initial position when it is not pressed under the action of the elastic restoring force.

In summary, the present disclosure utilizes the key substrate 10 with multiple key caps 12 to complete the alignment and arrangement of multiple keys at one time, and forms the waterproof key 100 with multiple keys after mold pressing and injection molding. In addition, the waterproof key 100 made by this manufacturing method is not completely covered by the waterproof layer 40 on the upper and lower surfaces of the keycap 12, but can be directly connected to the housing 91 of the electronic device 90 outside the waterproof layer 40. It is in contact with the circuit board 92 located inside the waterproof layer 40 to improve the pressing feeling. Also because there is no need to place the keycaps 12 one by one in the mold, the time and cost of manufacturing and assembling can also be greatly reduced.

Although the content of this disclosure is disclosed above with the aforementioned embodiments, it is not intended to limit the content of this disclosure. Anyone who is familiar with similar technology can make some changes and modifications without departing from the spirit and scope of this disclosure. Therefore The scope of patent protection of this disclosure shall be subject to the definition of the scope of patent application attached to this specification.

100: waterproof button 10: Button substrate 11: board body 111: opening 12: Keycap 121: Connection section 122: Press column 123: lower surface 20: First Mold 21: First Pedestal 211: surface 22: Hollow boss 30: Second mold 31: The second base 311: surface 32: Groove 321: Keycap accommodation part 33: Plate housing part 34: spacer column 40: waterproof layer 90:Electronic device 91: shell 911: key slot 912: key opening 92: circuit board 93: outer cover D1: Notch inner diameter D2: diameter D3: inner diameter S10-S70: Steps

[Fig. 1] is a flow chart of a method for manufacturing a waterproof button according to an embodiment of the present disclosure; [Fig. 2A] is a partial schematic diagram of the upper side of the key substrate of the waterproof key according to an embodiment of the present disclosure; [Fig. 2B] is a partial schematic diagram of the lower side of the key substrate of the waterproof key according to an embodiment of the present disclosure; [Fig. 3] is a schematic diagram of the first mold, the key substrate and the second mold of the waterproof key according to an embodiment of the present disclosure; [Fig. 4] is a schematic cross-sectional view of the first mold, the key substrate and the second mold of the waterproof key according to an embodiment of the present disclosure; [FIG. 5] It is a schematic diagram of the cross-sectional action of pressing the second mold of the waterproof button to the first mold according to an embodiment of the present disclosure; [FIG. 6] It is a schematic cross-sectional view of the second mold of the waterproof button according to an embodiment of the present disclosure, which is press-fitted to the first mold; [ FIG. 7 ] is a schematic cross-sectional view of a waterproof button injected with a soft material between the first mold and the second mold according to an embodiment of the present disclosure; [ FIG. 8 ] is a partial schematic diagram of a waterproof button according to an embodiment of the present disclosure; and [ FIG. 9 ] is a partial cross-sectional schematic diagram of an electronic device according to an embodiment of the present disclosure.

S10-S70: Steps

Claims (9)

A method for manufacturing a waterproof button, comprising: A button substrate is provided, the button substrate includes a plate body, a plurality of keycaps and at least one connecting section, the plate body is provided with a plurality of openings, the keycaps are respectively arranged in these openings, and each of the keycaps passes through the at least one A connection section is connected with the board body; A first mold is provided, and the first mold includes a first base and a plurality of hollow protrusions, and the hollow protrusions are arranged on a surface of the first base at intervals, and are arranged corresponding to the arrangement of the keycaps; placing the button substrate on the first mold, so that the keycaps are correspondingly located on the hollow bosses; A second mold is provided, the second mold includes a second base and a plurality of grooves, the grooves are recessed on a surface of the second base, and are arranged corresponding to the arrangement of the keycaps; The second mold is pressed onto the button substrate and the first mold, so that the second base of the second mold pushes against the board until the connecting sections are disconnected, and the keycaps and the corresponding hollow The protruding pillars are respectively accommodated in the grooves, and the board is sandwiched between the first base and the second base; Injecting a soft material between the first mold and the second mold, and making the soft material cover the board and surround the keycaps to form a waterproof layer; and The first mold and the second mold are removed to obtain the waterproof key. The manufacturing method of the waterproof key according to claim 1, wherein each of the key caps includes a pressing column extending from the lower surface of the key cap, and when the key substrate is placed on the first mould, the pressing columns The pillars respectively pass through the hollow convex pillars, so that the keycaps respectively correspond to the hollow convex pillars. The method for manufacturing a waterproof key according to claim 1, wherein the shape of the notch of each of the grooves corresponds to the shape of the keycaps, and the notch is larger than the keycap and smaller than the opening. The manufacturing method of the waterproof key according to claim 3, wherein the groove bottom of each of the grooves has a keycap accommodating part, and the shape of the keycap accommodating part is the same as that of the key accommodated in the groove The shapes of the caps are the same, and after the second mold is pressed onto the key substrate and the connecting sections are disconnected, the upper surface side of the key cap is accommodated in the key cap accommodating portion. The manufacturing method of the waterproof button as described in claim 1, wherein the second mold further includes a plate accommodating portion, the plate accommodating portion is recessed on the surface of the second base, and the plate accommodates The shape of the placement part is corresponding to the shape of the board body, and when the second mold is pressed on the key substrate, the board body is limited in the board body accommodating part. The manufacturing method of the waterproof button according to claim 5, wherein the plate housing part is provided with a spacer between two adjacent grooves, when the second mold is pressed on the button substrate , the spacing columns are against the plate body. The method for manufacturing a waterproof key according to claim 1, wherein the cross-sectional area of the hollow boss is smaller than the area of the key cap. The method for manufacturing a waterproof key according to claim 1, wherein the key substrate is made of a hard material, wherein the hard material has a molding hardness greater than that of the soft material. An electronic device comprising: A housing with a plurality of key slots, each of which has a key opening at the bottom; a circuit board accommodated in the casing; A waterproof button, the waterproof button is made by the manufacturing method described in any one of claims 1 to 8, the waterproof button is arranged above the circuit board and the keycaps are respectively passed through the button holes one of which is accommodated in the key slot; and A plurality of outer covers respectively cover the keycaps.

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