Key assembly, fixing mold and electronic equipment

Abstract

The embodiment of the utility model provides a key assembly, a fixing mold and electronic equipment. The key assembly comprises a key, a circuit board body and a metal elastic sheet installed on the circuit board body. The metal elastic sheet covers one side, facing the key, of the conduction part of the circuit board body, and the side, facing the conduction part, of the metal elastic sheet is provided with a deformation space. And when the key is pressed, the metal elastic sheet can deform towards the interior of the deformation space to be conducted with the conducting part. The circuit board body is provided with a limiting part on the side of the metal elastic sheet, and when the circuit board body is embedded in a fixed mold, the limiting part can be matched with a positioning part on the fixed mold, so that the fixed mold can limit the movement of the circuit board body in the circumferential direction, and the circuit board body is prevented from rotating relative to the fixed mold; therefore, when the metal elastic sheet is manually mounted, the position of the metal elastic sheet on the circuit board body can be accurately positioned, the center of the metal elastic sheet can be prevented from deviating relative to the conduction part as much as possible after the metal elastic sheet is mounted, the key can effectively press the metal elastic sheet, and the key pressing hand feeling of a user is improved.

Description

Technical Field

[0001] The present application relates to the technical field of buttons, and particularly relates to a button assembly, a fixing mold and an electronic device. Background Art

[0002] With the continuous development of electronic devices, more and more electronic devices use a single button circuit board for the power button and the volume control.

[0003] The button circuit board usually includes a silicone side button circuit board and a side button flexible circuit board. Compared with the silicone side button circuit board, the side button flexible circuit board has a cost advantage. Limited by the cost of electronic devices, the side button flexible circuit board has been more widely used in electronic devices. The side button flexible circuit board may include a circuit board body and a metal shrapnel. The circuit board body has a conduction part. The metal shrapnel is mounted on the circuit board body and covers the side of the conduction part facing the button. When the user presses the button, the button drives the metal shrapnel to deform towards the side of the conduction part, so that the metal shrapnel is in conduction with the conduction part, realizing the function of the button. During the deformation of the metal shrapnel towards the side of the conduction part, the gas inside the metal shrapnel is discharged to the outside of the metal shrapnel. When the user releases the button, the gas flows back into the metal shrapnel again, causing the metal shrapnel and the button to rebound.

[0004] However, for the existing side button flexible circuit board, when the user presses the button, the button cannot effectively press the metal shrapnel, resulting in insufficient exhaust of the metal shrapnel and poor button feel for the user. Utility Model Content

[0005] The embodiments of the present application provide a button assembly, a fixing mold and an electronic device, which can improve the button feel of the user.

[0006] In a first aspect, the embodiments of the present application provide a button assembly, which includes:

[0007] A button;

[0008] A button circuit board, including a circuit board body and a metal shrapnel. A conduction part is provided at a position corresponding to the button on the board surface of the circuit board body; the metal shrapnel is mounted on the circuit board body and covers the side of the conduction part facing the button, and a deformation space is provided on the side of the metal shrapnel facing the conduction part; the metal shrapnel is configured to deform into the deformation space when the button is pressed and conduct with the conduction part;

[0009] Wherein, a limiting part is provided on the board surface of the circuit board body on the side of the metal shrapnel. The limiting part is configured to cooperate with a positioning part on the fixing mold when the circuit board body is embedded in the fixing mold.

[0010] In the key assembly of the embodiment of the present application, a limiting portion is provided on the circuit board body. Since the limiting portion is constructed to cooperate with the positioning portion on the fixed mold when the circuit board body is embedded in the fixed mold, the circumferential movement of the circuit board body can be restricted by embedding the circuit board body with the fixed mold, thereby achieving preliminary positioning of the circuit board body, so that when the metal spring sheet is manually mounted, the position of the metal spring sheet on the circuit board body can be preliminarily positioned to avoid excessive positional displacement of the circuit board body relative to the fixed mold during the mounting process of the metal spring sheet, so that when the metal spring sheet is manually mounted, the position of the metal spring sheet on the circuit board body can be positioned to avoid the center of the metal spring sheet being offset relative to the conductive portion after the metal spring sheet is mounted.

[0011] On this basis, due to the cooperation between the limiting part and the positioning part, the fixed mold can cooperate with the inside of the circuit board body to further limit the circumferential movement of the circuit board body, and can enhance the positioning effect of the fixed mold on the circuit board body to avoid the circuit board body from rotating relative to the fixed mold, so that the position of the metal dome on the circuit board body can be accurately positioned when the metal dome is manually mounted, and the center of the metal dome can be avoided from being offset relative to the conductive part after mounting, so that when the user presses the button, the button can effectively press the metal dome, so that the gas in the metal dome can be discharged to the outside of the metal dome, and the metal dome is exhausted more fully, thereby effectively solving the technical problem of poor key feel of the user caused by the offset of the center of the metal dome relative to the conductive part, and the user experience is improved.

[0012] In some embodiments, the metal spring has a projection area on the board surface of the circuit board body, and the limiting portion is located outside the projection area, so that the limiting portion can be completely located on the side of the metal spring to avoid the setting of the limiting portion affecting the setting of the conductive portion on the circuit board body, thereby ensuring the conductive effect between the metal spring and the conductive portion.

[0013] In some embodiments, a wiring area is provided between the limiting portion and the edge of the circuit board body, so that the conducting portion can achieve the key function of the key assembly by connecting with the conducting part of the circuit board body at the electrical connection end through the line in the wiring area.

[0014] In some embodiments, the center of the limiting portion and the center of the conducting portion are both located on the central axis of the circuit board body in the width direction to ensure that the circuit board body is disposed in the slot body. After the limiting portion cooperates with the positioning portion, the line connecting the center of the limiting portion and the center of the conducting portion coincides with the central axis, so that the position of the metal spring sheet on the circuit board body can be accurately positioned when the metal spring sheet is manually mounted, ensuring that the center of the metal spring sheet after manual mounting is completed will not be offset relative to the center of the conducting portion, so as to further enhance the user's key feel.

[0015] In some embodiments, the number of keys is at least two, and the circuit board body is provided with at least one conduction part at the position corresponding to each key, so that there are at least as many conduction parts on the circuit board as the number of keys, in order to realize the key functions of the key assembly at each key;

[0016] The conduction parts are arranged at intervals along the extending direction of the circuit board body. The circuit board body is correspondingly provided with metal elastic pieces at the positions corresponding to each conduction part. A limiting part is arranged on the periphery of each metal elastic piece, and the limiting part is configured to have a positioning part corresponding to it in the fixing mold.

[0017] Through the cooperation of multiple limiting parts and the corresponding positioning parts, the positioning effect of the fixing mold on the circuit board body can be enhanced again. After the metal elastic piece is mounted, the center of the metal elastic piece will not shift relative to the conduction part, so as to further improve the user's key pressing feel.

[0018] In some embodiments, a conduction part is arranged between at least some adjacent metal elastic pieces. In this way, while enhancing the limiting effect of the fixing mold on the circuit board body through the cooperation of multiple limiting parts and positioning parts, the number of limiting parts and positioning parts can be reduced, so as to enhance the structural strength of the circuit board body and simplify the structure of the fixing mold.

[0019] In some embodiments, the limiting part is a first through hole through which the positioning part can pass. The shape of the first through hole matches the shape surrounded by the peripheral contour of the positioning part, so that the shape of the first through hole and the shape surrounded by the peripheral contour of the positioning part have a high degree of matching, so as to enhance the positioning effect of the fixing mold on the circuit board body, and further avoid the center of the metal elastic piece shifting relative to the conduction part after mounting, and improve the user's key pressing feel.

[0020] In some embodiments, the key assembly further includes:

[0021] A reinforcing sheet is arranged on the side of the circuit board body facing the key; the reinforcing sheet is provided with a relief opening at the position corresponding to the metal elastic piece, and the metal elastic piece is arranged in the corresponding relief opening;

[0022] Wherein, the reinforcing sheet is provided with an air guiding channel and an expansion channel. The air guiding channel is located on the side of the relief opening facing the limiting part and can be communicated with the deformation space, so that when the metal elastic piece deforms towards the deformation space, the gas in the metal elastic piece can be discharged into the air guiding channel to facilitate the user to press the key;

[0023] The reinforcing sheet is provided with an expansion channel at the position corresponding to the limiting part, and the limiting part is communicated with the air guiding channel through the expansion channel.

[0024] Based on the air guiding channel, through the setting of the expansion channel, the exhaust space of the metal shrapnel can be expanded within the plane where the reinforcing sheet is located, so that when the user presses the button, the metal shrapnel can exhaust sufficiently, the user is more labor-saving when pressing the button, the rebound rate of the button is higher, and the user's button feel is further improved. Moreover, since the limiting part can be communicated with the air guiding channel through the expansion channel, the exhaust space of the metal shrapnel can be further expanded in the thickness direction of the button assembly through the limiting part, which can enhance the sufficiency of the metal shrapnel exhaust, the user is more labor-saving when pressing the button, the rebound rate of the button is further enhanced, the button can rebound quickly, and the user's button feel can be greatly improved.

[0025] Through experimental tests, compared with only the air guiding channel provided on the reinforcing sheet, when the limiting part is communicated with the air guiding channel through the expansion channel, the exhaust space of the metal shrapnel can be expanded by at least 40%. Through the setting of the expansion channel and the limiting part, the exhaust space of the metal shrapnel can be greatly increased, and the user's button feel is greatly improved.

[0026] In some embodiments, the expansion channel is the second through hole provided on the reinforcing sheet, and the shape of the second through hole matches the shape of the limiting part, so that the shape of the second through hole and the shape of the limiting part have a high degree of matching, so that without changing the sizes of the second through hole and the limiting part, the communication caliber between the limiting part and the air guiding channel can be increased, and then the exhaust space of the metal shrapnel can be increased.

[0027] In some embodiments, the diameter of the second through hole is larger than the diameter of the limiting part, so as to overcome the tolerances such as the mounting of the reinforcing sheet on the circuit board body, so that the limiting part will not be blocked by the reinforcing sheet, and the structure of the limiting part can be effectively and reasonably utilized during the exhaust process of the metal shrapnel, improving the user's button feel.

[0028] In some embodiments, the center of the expansion channel and the center of the limiting part are located on the same axis, so that the expansion channel is arranged opposite to the limiting part, so as to further ensure that the limiting part will not be blocked by the reinforcing sheet.

[0029] In some embodiments, the air guiding channel is the opening penetrating both sides of the reinforcing sheet in the thickness direction, and the diameter of the expansion channel is larger than the opening width of the opening, which can further increase the expansion effect of the expansion channel on the exhaust space of the metal shrapnel.

[0030] In some embodiments, along the width direction of the reinforcing sheet:

[0031] There is a distance between the expansion channel and the edge of the reinforcing sheet to reduce the possibility of the reinforcing sheet breaking at the expansion channel.

[0032] In some embodiments, at least part of the air guiding channels on the opposite sides of adjacent metal shrapnels are communicated through the same expansion channel.

[0033] When the air guide channels of adjacent metal shrapnel are connected through the same expansion channel, when one of the metal shrapnel deforms towards the deformation space, the gas in the metal shrapnel can enter the limiting part through the expansion channel and at the same time can also enter the air guide channel of the other connected metal shrapnel through the expansion channel, thereby further increasing the exhaust space of the metal shrapnel and enhancing the sufficiency of the metal shrapnel exhaust, so that the user's key pressing feel can be greatly improved. At the same time, the number of expansion channels on the reinforcing sheet can be reduced to simplify the structure of the reinforcing sheet and ensure the structural strength of the reinforcing sheet.

[0034] In some embodiments, the key assembly further includes:

[0035] A deformable sealing film, covering both sides of the circuit board body in the board thickness direction, and at least the parts of the metal shrapnel and the reinforcing sheet provided with avoidance openings, air guide channels and expansion channels are wrapped inside the sealing film.

[0036] Through the setting of the sealing film, it can be ensured that the circuit board body has good sealing performance at the conducting part, so as to avoid liquid or water vapor from entering the inside of the key assembly to corrode the conducting part or the metal shrapnel, ensure the normal use of the key function of the key assembly, improve the service life of the key assembly, and at the same time, it can also play a role in dust prevention.

[0037] In some embodiments, the key assembly further includes:

[0038] A deformable sealing film, covering both sides of the circuit board body in the board thickness direction, and the metal shrapnel is wrapped inside the sealing film;

[0039] A reinforcing sheet, arranged on the side of the circuit board body facing the key and pressed on the outside of the sealing film; the reinforcing sheet is provided with an avoidance opening at the position corresponding to the metal shrapnel, and the metal shrapnel is arranged in the corresponding avoidance opening;

[0040] Wherein, the reinforcing sheet is provided with an air guide channel and an expansion channel, and the air guide channel is located on the side of the avoidance opening facing the limiting part; the reinforcing sheet is provided with an expansion channel at the position corresponding to the limiting part.

[0041] Through the settings of the air guide channel, the expansion channel and the limit, the exhaust space of the metal shrapnel can also be greatly increased, and the user's key pressing feel can be greatly improved. Moreover, the reinforcing sheet is pressed on the outside of the sealing film, which can enhance the overall strength of the key assembly, prevent the sealing film from warping, and at the same time, make it difficult for liquid, water vapor, etc. to enter the inside of the sealing film, and can also play a role in waterproofing.

[0042] In a second aspect, an embodiment of the present application provides an electronic device, which includes a housing and a key assembly as described in any one of the above. The key assembly is installed on the side wall of the housing, and a part of the key in the key assembly is exposed on the appearance surface of the housing to realize the key function of the key assembly. At the same time, due to the setting of the limiting portion, the key feel of the user can also be improved.

[0043] In a third aspect, an embodiment of the present application provides a fixing mold, which includes a mold body and a positioning portion. The mold body has a groove body, and the shape of the groove body matches the shape of the circuit board body in the key assembly; the positioning portion is arranged at the bottom of the groove body and corresponds to the position of the limiting portion of the circuit board body.

[0044] Since the shape of the groove body matches the shape of the circuit board body, the shape of the groove body and the shape of the circuit board body have a good matching degree. When the circuit board body is arranged in the groove body, the circuit board body can be embedded in the fixing mold, and at the same time, the fixing mold can limit the movement of the circuit board body in the circumferential direction. And by limiting the position of the positioning portion, the cooperation between the limiting portion and the positioning portion can be realized, the positioning effect of the fixing mold on the circuit board body can be enhanced, and the circuit board body can be prevented from rotating relative to the fixing mold.

[0045] In some embodiments, the positioning portion is a protruding column at the bottom of the groove, and the protruding column is configured to be penetrable into the limiting portion so as to realize the cooperation between the limiting portion and the positioning portion, thereby realizing the internal cooperation between the fixing mold and the circuit board body. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 is a schematic structural diagram of an electronic device provided by an embodiment of the present application from a first perspective;

[0047] Figure 2 is an exploded view of an electronic device provided by an embodiment of the present application;

[0048] Figure 3 is a schematic structural diagram of an electronic device provided by an embodiment of the present application from a second perspective;

[0049] Figure 4 is a partial schematic diagram of a key assembly provided in the related art;

[0050] Figure 5 is a partial schematic diagram of the first key assembly provided by an embodiment of the present application;

[0051] Figure 6 is Figure 5 a partial cross-sectional view in the A-A direction;

[0052] Figure 7 is a schematic structural diagram of a key circuit board provided by an embodiment of the present application;

[0053] Figure 8 Schematic diagram of the assembly of a circuit board body provided by an embodiment of the present application in a fixing mold;

[0054] Figure 9 Schematic diagram of the structure of another key circuit board provided by an embodiment of the present application;

[0055] Figure 10 Partial schematic diagram of the second key component provided by an embodiment of the present application;

[0056] Figure 11 For Figure 10 Cross-sectional view of the right region in the B-B direction;

[0057] Figure 12 For Figure 10 Cross-sectional view of the left region in the B-B direction;

[0058] Figure 13 Schematic diagram of the structure of a sealing film and a reinforcing sheet provided by an embodiment of the present application;

[0059] Figure 14 Partial schematic diagram of the third key component provided by an embodiment of the present application;

[0060] Figure 15 Hand feeling elastic force curve graph of the key component of the control group provided by an embodiment of the present application;

[0061] Figure 16 Hand feeling elastic force curve graph of the key component of the test group provided by an embodiment of the present application.

[0062] Reference numerals:

[0063] 100 - Electronic device;

[0064] 10 - Middle frame; 11 - Middle plate; 12 - Frame; 121 - Left frame; 122 - Top frame; 123 - Right frame; 124 - Bottom frame;

[0065] 20 - Rear cover;

[0066] 30 - Internal components; 31 - Circuit board; 32 - Battery; 33 - Camera;

[0067] 40 - Display screen;

[0068] 50 - Key component; 50a - Power button; 50b - Volume button;

[0069] 51 - Key; 511 - Trigger part;

[0070] 52 - Circuit board body; 521 - Conductive part; 522 - Electrical connection terminal; 5221 - Conductive position; 523 - Limiting part; 524 - Edge; 525 - Wiring area; 526 - Concave area;

[0071] 53 - Metal shrapnel; 531 - Deformation space; 53a - First metal shrapnel; 53b - Second metal shrapnel; 53c - Third metal shrapnel;

[0072] 54 - Reinforcing sheet; 541 - Avoidance opening; 542 - Air guide channel; 543 - Expansion channel;

[0073] 55 - Sealing film;

[0074] 200 - Fixing mold; 210 - Mold body; 211 - Groove body; 220 - Positioning part. Specific embodiments

[0075] The terms used in the embodiment part of this application are only for explaining the specific embodiments of this application, rather than aiming to limit this application.

[0076] The embodiments of this application provide an electronic device. The electronic device may include, but is not limited to, electronic devices with button functions such as mobile phones, tablet computers (i.e., pads), virtual reality (VR) devices, laptop computers, personal computers (PCs), ultra-mobile personal computers (UMPCs), handheld computers, smart wearable devices, etc. A mobile phone may include a foldable mobile phone or a non - foldable mobile phone. A foldable mobile phone may be simply referred to as a folding mobile phone. A non - foldable mobile phone may be simply referred to as a non - folding mobile phone. Smart wearable devices may include, but are not limited to, smart watches and smart bracelets.

[0077] Figure 1 Schematically shows a structural diagram of an electronic device 100 from a first perspective. The first perspective can be understood as the front of the electronic device 100. Figure 2 Shows Figure 1 an exploded view of the electronic device 100 in Figure 2 Only shows some structures in the electronic device 100, and does not constitute a limitation on the structure of the electronic device 100. Figure 3 Schematically shows a structural diagram of an electronic device 100 from a second perspective. The second perspective can be understood as the back of the electronic device 100. Figures 1 to 3 The electronic device 100 in Figures 1 to 3 is a non - folding mobile phone. The following combines

[0078] See Figure 1 As shown, the electronic device 100 may include a housing. The housing may include a middle frame 10. The middle frame 10 is the main supporting structure of the electronic device 100.

[0079] See Figure 2 As shown, the middle frame 10 may include a middle plate 11 and a border 12 that are interconnected. The button assembly 50 may be disposed on the border 12. The border 12 may include a left border 121, a top border 122, a right border 123, and a bottom border 124. The left border 121, the top border 122, the right border 123, and the bottom border 124 may be connected end to end to form an annular border 12. The border 12 surrounds the circumferential edge of the middle plate 11 and is connected to the circumferential edge of the middle plate 11. The border 12 may form the side wall of the housing, and the outer wall of the border 12 constitutes the appearance surface of the housing. The appearance surface of the housing may be understood as the part of the housing that is exposed outside the electronic device 100.

[0080] See Figure 3 And in combination with Figure 2 , the housing may further include a rear cover 20. The rear cover 20 is covered on one side of the middle frame 10 and is connected to the middle frame 10, so as to realize the setting and fixing of the rear cover 20 on the middle frame 10. The side of the rear cover 20 facing away from the middle plate 11 may be regarded as the back of the electronic device 100.

[0081] See again Figure 2 , when the rear cover 20 is covered on one side of the middle frame 10, it may enclose a receiving cavity with the middle frame 10. The receiving cavity may be used to receive internal components 30 such as the circuit board 31, the battery 32, and the camera 33 of the electronic device 100. Among them, the setting methods of the circuit board 31, the battery 32, and the camera 33 on the electronic device 100 may refer to the settings in existing electronic devices 100 (such as mobile phones), and will not be further limited in this embodiment.

[0082] See again Figure 2 And in combination with Figure 1 , the electronic device 100 may further include a display screen 40. The display screen 40 may be covered on the side of the middle frame 10 opposite to the rear cover 20 and is connected to the border 12, so as to realize the setting and fixing of the display screen 40 on the middle frame 10. Among them, the side of the display screen 40 away from the middle plate 11 may be regarded as the front of the electronic device 100. The display screen 40 may be electrically connected to the circuit board 31 to provide a display interface and an interaction interface with the user for the electronic device 100.

[0083] Continue to refer to Figure 3, the electronic device 100 may include a button assembly 50. The button assembly 50 may be at least one of a power button 50a and volume buttons 50b. When the user presses the power button 50a, functions such as turning the electronic device 100 on and off and locking the screen can be controlled. The volume buttons 50b may include a volume up button and a volume down button. When the user presses the volume up button, the volume of the electronic device 100 can be increased, and when the user presses the volume down button, the volume of the electronic device 100 can be decreased.

[0084] As Figure 1 shown, the volume up button and the volume down button may form an integrated volume button 50b on the outside of the electronic device 100. Alternatively, in some embodiments, the volume up button and the volume down button may also form two separate (independent of each other) volume buttons 50b on the outside of the electronic device 100.

[0085] Continuing to refer to Figure 3 , the button assembly 50 may include a button 51. When the button assembly 50 is the integrated volume button 50b, the button assembly 50 may have one button 51, and the volume up button and the volume down button may share this one button 51. At this time, one end of the button 51 in the length direction Y of the electronic device 100 may be regarded as the pressing area of the volume up button, and the other end of the button 51 in the length direction Y of the electronic device 100 may be regarded as the pressing area of the volume down button. When the user presses the two pressing areas respectively, the volume up and volume down functions of the volume button 50b can be realized.

[0086] When the button assembly 50 is two separate volume buttons 50b, the button assembly 50 may have two buttons 51, and the volume up button and the volume down button are respectively provided with one button 51.

[0087] Taking the volume up button and the volume down button as the integrated volume button 50b as an example, the structure of the electronic device 100 will be further elaborated below.

[0088] Continuing to refer to Figure 3 , the button assembly 50 is installed on the side wall of the housing, and a part of the button 51 is exposed on the appearance surface of the housing, so as to facilitate the user to press the button 51 and realize the pressing function of the button assembly 50. The button assembly 50 can also be understood as the side button of the electronic device 100. For example, the button assembly 50 can be installed in the frame 12, and a part of the button 51 is exposed on the outer wall of the frame 12, so that while the button assembly 50 is installed inside the side wall of the housing, a part of the button 51 can be exposed on the appearance surface of the housing.

[0089] When the button assembly 50 is installed in the frame 12, each button assembly 50 can be arranged on the right frame 123.

[0090] Alternatively, in some embodiments, each key assembly 50 may also be disposed at other positions of the frame 12 (such as the left frame 121). Alternatively, in some embodiments, a part of the key assemblies 50 may be disposed on the right frame 123, and the remaining key assemblies 50 may be disposed on the left frame 121.

[0091] Compared with the other setting positions of the key assembly 50 described above, when the key assemblies 50 are all disposed on the right frame 123, the structure of the right frame 123 can be reasonably utilized, and while implementing the function of the keys 51 of the electronic device 100, it can better conform to the user's operation habit, so that the user can press each key assembly 50 with one hand.

[0092] Taking the example that each key assembly 50 can be disposed on the right frame 123, the structure of the electronic device 100 will be further described below.

[0093] The key assembly 50 may further include a key circuit board. The key circuit board may be disposed at a position of the frame 12 opposite to the key 51 and electrically connected to the circuit board 31. When the user presses the key 51 of the key assembly 50, the key 51 is conducted with the key circuit board to implement the function of the key assembly 50 when the user presses.

[0094] With the continuous development of the electronic device 100, the power button 50a and the volume button 50b of more and more electronic devices 100 adopt one key circuit board. This can reduce the number of key circuit boards, thereby saving the cost of the electronic device 100 and the space occupied by the key assembly 50.

[0095] The key circuit board generally includes a silicone side key circuit board and a side key flexible printed circuit (FPC). Compared with the silicone side key circuit board, the side key flexible circuit board has an advantage in cost. Limited by the cost of the electronic device 100, the side key flexible circuit board has been more widely used in the electronic device 100.

[0096] Figure 4 Schematically shows a partial schematic diagram of a key assembly 50A in the related art. Figure 4 The part shown in includes a side key flexible circuit board. The structure of the silicone side key circuit board can be referred to existing electronic devices and will not be described in detail in this application.

[0097] See Figure 4As shown in the figure, the side key flexible circuit board may include a circuit board body 52a and a metal dome 53A. The metal dome 53A may be a metal dome with a curvature. This metal dome is commonly known as a Dome. The circuit board body 52a has a conduction part 521a. The metal dome 53A may be installed on the circuit board body 52a and cover the side of the conduction part 521a facing the key 51a. When the user presses the key 51a, the key 51a will drive the metal dome 53A to deform toward the side of the conduction part 521a, so that the metal dome 53A is in conduction with the conduction part 521a, realizing the function of the key assembly 50A. During the process of the metal dome 53A deforming toward the side of the conduction part 521a, the gas inside the metal dome 53A will be discharged to the outside of the metal dome 53A and enter the air guide channel (not shown) of the key assembly 50A.

[0098] When the user releases the key 51a, the gas in the air guide channel will flow back into the metal dome 53A again, causing the metal dome 53A to rebound for the user to press next time. At the same time, the user obtains the key feel.

[0099] During the manufacturing process of the side key flexible circuit board, after the circuit and the conduction part 521a are made on the circuit board body 52a, the metal dome 53A needs to be mounted on the circuit board body 52a. During the mounting process of the metal dome 53A, manual mounting is usually adopted. Researchers found that the position of the circuit board body 52 during manual mounting will rotate, making it difficult to accurately position the metal dome 53A on the circuit board body 52a. After mounting, the center of the metal dome 53A often deviates relative to the conduction part 521a. This will cause that when the user presses the key 51a, the key 51a cannot effectively press the metal dome 53A, resulting in insufficient exhaust of the metal dome 53A. The user will find it strenuous to press the key 51a, and the rebound rate of the key 51a is not high enough, resulting in a poor key feel for the user.

[0100] On the contrary, for the silicone side key circuit board, the switch of the silicone side key circuit board is a silicone key (Switch). During the mounting process of the silicone key, an optical positioning mounting is carried out on the mounting of the silicone key on the circuit board body 52a by a mounter to ensure the accurate positioning mounting of the silicone key on the circuit board body 52a. Compared with the side key flexible circuit board, the silicone side key circuit board has a better key feel.

[0101] In summary, although the side key flexible circuit board has the advantages of simple structure, long service life and low cost compared with the silicone side key circuit board, the key feel of the side key flexible circuit board is poor.

[0102] Therefore, how to improve the key feel of the side key flexible circuit board has become a technical problem to be solved.

[0103] In view of this, embodiments of the present application provide a fixing mold and a button assembly. The button assembly may be at least one of a power button 50a and a volume button 50b. The button assembly includes a circuit board body and a metal shrapnel. When mounting the metal shrapnel, the circuit board body may be embedded in the fixing mold. Moreover, the fixing mold has a positioning portion, and the circuit board body has a limiting portion. When the button circuit board is embedded in the fixing mold, the limiting portion can cooperate with the positioning portion. Through the embedding of the circuit board body in the fixing mold and the cooperation between the limiting portion and the positioning portion, the fixing mold can better position the circuit board body to prevent the circuit board body from rotating relative to the fixing mold, so that when manually mounting the metal shrapnel, the position of the metal shrapnel on the circuit board body can be accurately positioned, and it is possible to avoid the center of the metal shrapnel deviating from the conduction portion after mounting as much as possible, thereby effectively solving the technical problem of poor button feel of the user caused by the deviation of the center of the metal shrapnel relative to the conduction portion.

[0104] First, the structure of the button assembly will be further elaborated below with reference to the drawings.

[0105] Figure 5 Fig. shows a partial schematic diagram of a button assembly provided by an embodiment of the present application. Figure 6 Fig. shows Figure 5 a partial cross-sectional view of the right region in the A-A direction. It should be noted that. Figure 5 shows the structure of the sealing film 55 included in the button assembly 50. For the convenience of viewing the structure of the button assembly 50, in Figure 5 the sealing film 55 is shown in a perspective view, which does not limit that the sealing film 55 itself has a perspective effect. The same understanding can be made for similar drawings in the following text.

[0106] In the description of the present application, the orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0107] Below, with reference to Figure 5 and Figure 6 the structure of the button assembly 50 will be further elaborated.

[0108] See Figure 5 and Figure 6As shown, the button assembly 50 may include a button 51 and a button circuit board. The button circuit board may include a circuit board body 52 and a metal shrapnel 53. The structure of the metal shrapnel 53 is the same as that of the metal shrapnel 53A mentioned above, and will not be elaborated here. A conduction part 521 is provided at a position corresponding to the button 51 on the board surface of the circuit board body 52. Exemplarily, the conduction part 521 may be a pad or other structures capable of conducting with the circuits on the circuit board body 52 and the metal shrapnel 53.

[0109] The circuit board body 52 has an electrical connection end 522. The electrical connection end 522 may be electrically connected to the circuit board 31, and the conduction part 521 may be conducted with the electrical connection end 522 through the circuits on the circuit board body 52. Specifically, the circuit board body 52 has a conduction part 5221 that conducts with the circuit board 31 at the electrical connection end 522. The conduction part 521 may be conducted with the conduction part 5221 through the circuits on the circuit board body 52. The conduction part 5221 may be a pad or the like.

[0110] The button circuit board further includes a metal shrapnel 53. The metal shrapnel 53 is mounted on the circuit board body 52 and covers the side of the conduction part 521 facing the button 51 to realize the installation of the metal shrapnel 53 on the circuit board body 52. Moreover, a deformation space 531 is provided on the side of the metal shrapnel 53 facing the conduction part 521. Among them, the metal shrapnel 53 is configured to be deformed into the deformation space 531 when the button 51 is pressed and conduct with the conduction part 521. When the user presses the button 51, the metal shrapnel 53 can be deformed into the deformation space 531 and conduct with the conduction part 521, thereby realizing the function of the button assembly 50.

[0111] See Figure 6 As shown, the button 51 has a trigger part 511. When the button 51 is mounted on the frame 12, the trigger part 511 is located inside the frame 12 and contacts the metal shrapnel 53. When the user presses the button 51, the trigger part 511 can move relative to the frame 12 toward the inner side of the frame 12 and act on the metal shrapnel 53, so that the metal shrapnel 53 is deformed into the deformation space 531 and conducts with the conduction part 521. The trigger part 511 may be a convex columnar structure on the button 51 or other structures capable of triggering the metal shrapnel 53.

[0112] Figure 7 Schematically shows a structural diagram of a button circuit board. See Figure 7 And in combination with Figure 6 As shown, a limiting part 523 is provided on the board surface of the circuit board body 52 on the side of the metal shrapnel 53.

[0113] Figure 8 Schematically shows an assembly diagram of the circuit board body 52 in the fixing mold 200. See Figure 8 And in combination withFigure 7 As shown, the limiting portion 523 is configured to cooperate with the positioning portion 220 on the fixed mold 200 when the circuit board body 52 is embedded in the fixed mold 200.

[0114] During the mounting process of the metal elastic sheet 53, the circuit board body 52 can be embedded in the fixed mold 200. By embedding the circuit board body 52 in the fixed mold 200, the movement of the circuit board body 52 in the circumferential direction can be restricted, realizing the preliminary positioning of the circuit board body 52, so that when manually mounting the metal elastic sheet 53, the position of the metal elastic sheet 53 on the circuit board body 52 can be preliminarily positioned, so as to avoid excessive position deviation of the circuit board body 52 relative to the fixed mold 200 during the mounting process of the metal elastic sheet 53, so that when manually mounting the metal elastic sheet 53, the position of the metal elastic sheet 53 on the circuit board body 52 can be positioned, thereby avoiding the center of the metal elastic sheet 53 deviating from the conduction portion 521 after the metal elastic sheet 53 is mounted.

[0115] To facilitate the taking of the circuit board body 52 in the fixed mold 200, when the circuit board body 52 is embedded in the fixed mold 200, a small gap is reserved between the circumferential side of the circuit board body 52 and the fixed mold 200. Due to the existence of the gap, during the mounting process of the metal elastic sheet 53, there is still a risk that the circuit board body 52 rotates relative to the fixed mold 200, which will affect the precise positioning of the position of the metal elastic sheet 53 on the circuit board body 52 when manually mounting the metal elastic sheet 53.

[0116] On this basis, when the key circuit board is embedded in the fixed mold 200, due to the cooperation between the limiting portion 523 and the positioning portion 220, the fixed mold 200 can cooperate with the inside of the circuit board body 52 to further restrict the movement of the circuit board body 52 in the circumferential direction, enhance the positioning effect of the fixed mold 200 on the circuit board body 52, avoid the circuit board body 52 rotating relative to the fixed mold 200, so that when manually mounting the metal elastic sheet 53, the position of the metal elastic sheet 53 on the circuit board body 52 can be precisely positioned, and try to avoid the center of the metal elastic sheet 53 deviating from the conduction portion 521 after mounting. In this way, when the user presses the key 51, the key 51 can effectively press the metal elastic sheet 53, so that the gas in the metal elastic sheet 53 can be discharged to the outside of the metal elastic sheet 53, and the metal elastic sheet 53 is exhausted more fully, thereby effectively solving the technical problem of poor key feel of the user caused by the center of the metal elastic sheet 53 deviating from the conduction portion 521, and the user experience is improved.

[0117] Continue to refer to Figure 8, the fixed mold 200 provided in the embodiment of the present application includes a mold body 210 and a positioning portion 220. The mold body 210 can be understood as the structure of the fixed mold 200 except for the positioning portion 220. The structure of the mold body 210 can be referred to Figure 8 as shown, and it can be a plate-like structure with a certain thickness. The mold body 210 has a groove 211. The shape of the groove 211 matches the shape of the circuit board body 52.

[0118] It should be noted that "the shape and size of A match the shape and size of B" mentioned in the present application can be understood as the shape and size of A are the same as or similar to the shape and size of B. For example, "the shape of the groove 211 matches the shape of the circuit board body 52" can be understood as the shape of the groove 211 is the same as or similar to the shape of the circuit board body 52. For example, when the shape of the circuit board body 52 is rectangular, the shape of the groove 211 is also a rectangle that matches the shape of the circuit board body. Another example, continue to refer to Figure 8 , when the shape of the circuit board body 52 is an irregular shape, the shape of the groove 211 is also an irregular shape that matches the shape of the circuit board body. Similar descriptions hereinafter can be understood in this way.

[0119] Since the shape of the groove 211 matches the shape of the circuit board body 52, the shape of the groove 211 and the shape of the circuit board body 52 have a good degree of matching, so that when the circuit board body 52 is disposed in the groove 211, it can be embedded in the fixed mold 200. At the same time, the groove wall of the groove 211 will limit the rotation of the circuit board body 52 in the groove 211, so that the fixed mold 200 can limit the circumferential movement of the circuit board body 52.

[0120] Continue to refer to Figure 8 , the positioning portion 220 can be disposed at the bottom of the groove 211 and corresponds to the position of the limiting portion 523 of the circuit board body 52, so that when the circuit board body 52 is disposed in the groove 211, the positioning portion 220 can correspond to the limiting portion 523 to realize the cooperation between the limiting portion 523 and the positioning portion 220, enhance the positioning effect of the fixed mold 200 on the circuit board body 52, and avoid the rotation of the circuit board body 52 relative to the fixed mold 200.

[0121] Continue to refer to Figure 8, in some embodiments, the positioning portion 220 may be a protruding post at the bottom of the groove, and the protruding post is configured to be penetrable through the limiting portion 523, so that the limiting portion 523 cooperates with the positioning portion 220, thereby realizing the internal cooperation between the fixing mold 200 and the circuit board body 52. At this time, the limiting portion 523 may be a first through hole through which the positioning portion 220 can pass, and the shape of the first through hole matches the shape surrounded by the peripheral contour of the positioning portion 220, so that the shape of the first through hole and the shape surrounded by the peripheral contour of the positioning portion 220 have a high degree of matching. When the protruding post penetrates through the first through hole, it can have a better limiting effect on the rotation of the circuit board body 52 in the groove body 211, so as to enhance the positioning effect of the fixing mold 200 on the circuit board body 52 again, thereby achieving a better effect of preventing the circuit board body 52 from rotating relative to the fixing mold 200, and further avoiding the center of the metal elastic sheet 53 from deviating relative to the conduction portion 521 after being mounted, and improving the user's key pressing feel.

[0122] For example, the shape surrounded by the peripheral contour of the positioning portion 220 may be circular, rectangular, or other irregular shapes. Correspondingly, the first through hole may also be a circular hole, a rectangular hole, or other irregular shaped holes of the positioning portion 220.

[0123] Taking the first through hole as a circular hole as an example below, the structures of the electronic device 100 and the key assembly 50 will be further described.

[0124] Or, in some embodiments, the positioning portion 220 may be a first through hole, and the limiting portion 523 may be a protruding post. When the circuit board body 52 is disposed in the groove body 211, by passing the protruding post through the first through hole, the effect of better preventing the circuit board body 52 from rotating relative to the fixing mold 200 can also be achieved.

[0125] Taking the limiting portion 523 as the first through hole and the positioning portion 220 as the protruding post as an example below, the structures of the electronic device 100 and the key assembly 50 will be further described.

[0126] Refer to again Figure 7 , the metal elastic sheet 53 has a projection area on the board surface of the circuit board body 52, and the limiting portion 523 may be located outside the projection area. If the limiting portion 523 is located on the side of the metal elastic sheet 53 and part of the limiting portion 523 is still located within the projection area, it may affect the setting of the conduction portion 521 on the circuit board body 52, and further affect the conduction effect between the metal elastic sheet 53 and the conduction portion 521. Therefore, in this application, by disposing the limiting portion 523 outside the projection area of the circuit board body 52, it can be ensured that the limiting portion 523 is entirely located on the side of the metal elastic sheet 53, so as to avoid the setting of the limiting portion 523 from affecting the setting of the conduction portion 521 on the circuit board body 52, and further ensure the conduction effect between the metal elastic sheet 53 and the conduction portion 521.

[0127] It should be noted that in some embodiments, the limiting portion 523 may also be disposed within the projection area while not affecting the conduction effect between the metal elastic piece 53 and the conduction portion 521.

[0128] In some embodiments, there may be a wiring area 525 between the limiting portion 523 and the edge 524 of the circuit board body 52, so as to facilitate wiring around the limiting portion 523 of the circuit board body 52, enabling the conduction portion 521 to conduct with the conduction part 5221 of the electrical connection end 522 through the lines in the wiring area 525, thereby realizing the function of the button 51 of the button assembly 50.

[0129] It should be noted that when the number of the conduction portions 521 is multiple, the circuit board body 52 also has multiple conduction parts 5221 on the electrical connection end 522. Each conduction portion 521 corresponds to one conduction part 5221, so that the conduction portion 521 can conduct with the corresponding conduction part 5221 through the lines on the circuit board body 52.

[0130] Taking the limiting portion 523 being located outside the projection area as an example, the structures of the electronic device 100 and the button assembly 50 will be further elaborated below.

[0131] Refer to again Figure 7 , when manufacturing the conduction portion 521, the center of the conduction portion 521 will be located on the central axis L1 in the width direction of the circuit board body 52, so that the conduction part 5221 is at the central position of the circuit board body 52. The width direction of the circuit board body 52 is parallel to the thickness direction Z of the electronic device 100.

[0132] Figure 9 Schematically shows a structural diagram of another button circuit board. Refer to Figure 9 As shown, in some embodiments, the center of the limiting portion 523 may deviate from the central axis L1, then the connecting line L2 between the center of the limiting portion 523 and the center of the conduction portion 521 is arranged at an angle with the central axis L1, such that the centers of the limiting portion 523 and the conduction portion 521 have an oblique line relationship. The researchers found that when the centers of the limiting portion 523 and the conduction portion 521 have an oblique line relationship, when the circuit board body 52 is embedded in the fixed mold 200, the limiting portion 523 cooperates with the positioning portion 220, and the center of the metal elastic piece 53 after manual mounting may still deviate slightly relative to the center of the conduction portion 521, leaving room for further improvement in the pressing feel of the button assembly 50.

[0133] Refer to again Figure 7, in some embodiments, the centers of the limiting portion 523 and the conducting portion 521 can both be located on the central axis L1 to ensure that the circuit board body 52 is disposed in the groove body 211. After the limiting portion 523 cooperates with the positioning portion 220, the connecting line L2 of the centers of the limiting portion 523 and the conducting portion 521 coincides with the central axis L1, so as to accurately position the position of the metal elastic sheet 53 on the circuit board body 52 when manually mounting the metal elastic sheet 53, and ensure that the center of the metal elastic sheet 53 after manual mounting is not offset relative to the center of the conducting portion 521, so as to further improve the user's key pressing feel.

[0134] Taking the centers of the limiting portion 523 and the conducting portion 521 both being located on the central axis L1 as an example, the structures of the electronic device 100 and the key assembly 50 will be further described below.

[0135] In some embodiments, the number of the keys 51 in the key assembly 50 can be one. At this time, the key assembly 50 can be the volume key 50b or the power key 50a. When the key assembly 50 is the volume key 50b, two conducting portions 521 can be provided on the circuit board body 52. When the key assembly 50 is the power key 50a, one conducting portion 521 can be provided on the circuit board body 52.

[0136] Alternatively, in some other embodiments, the number of the keys 51 in the key assembly 50 can also be at least two. For example, the number of the keys 51 can be two or three, etc. When the number of the keys 51 is two, the key assembly 50 can be a split-type volume key 50b (an independent volume up key and a volume down key), and two conducting portions 521 can be provided on the circuit board body 52.

[0137] Alternatively, when the number of the keys 51 is two, the key assembly 50 can also be the power key 50a and an integrated volume key 50b (an integrated volume up key and a volume down key), that is to say, the key assembly 50 has the key 51 functions of both the power key 50a and the volume key 50b. At this time, three conducting portions 521 can be provided on the circuit board body 52.

[0138] Alternatively, when the number of the keys 51 is three, the key assembly 50 can also be the power key 50a and a split-type volume key 50b. Similarly, the key assembly 50 has the key 51 functions of both the power key 50a and the volume key 50b. At this time, three conducting portions 521 can be provided on the circuit board body 52.

[0139] When the number of the keys 51 in the key assembly 50 is at least two, the circuit board body 52 is provided with at least one conduction part 521 at the position corresponding to each key 51, so that at least the same number of conduction parts 521 as the number of the keys 51 are provided on the circuit board 31, so as to realize the key 51 function of the key assembly 50 at each key 51. For example, when the key assembly 50 includes an integrated volume key 50b, the circuit board body 52 may be provided with two conduction parts 521 at the position corresponding to the key 51 of the integrated volume key 50b.

[0140] Taking the number of the keys 51 in the key assembly 50 as at least two and the circuit board body 52 being provided with three conduction parts 521 as an example, the structures of the electronic device 100 and the key assembly 50 will be further described below.

[0141] Refer to again Figure 7 , each conduction part 521 may be arranged at intervals along the extending direction of the circuit board body 52. The extending direction of the circuit board body 52 is parallel to the length direction Y of the electronic device 100. The circuit board body 52 is correspondingly provided with a metal elastic sheet 53 at the position corresponding to each conduction part 521, so that when the metal elastic sheet 53 is conducted with the corresponding conduction part 521, the key 51 function of the key assembly 50 can be realized. A limiting part 523 is arranged on the peripheral side of each metal elastic sheet 53, so that the center of each limiting part 523 can be located on the central axis L1.

[0142] Each limiting part 523 is configured to have a corresponding positioning part 220 in the fixing die 200. In this way, through the cooperation of the multiple limiting parts 523 and the corresponding positioning parts 220, the positioning effect of the fixing die 200 on the circuit board body 52 can be enhanced again, ensuring that after the metal elastic sheet 53 is mounted, the center of the metal elastic sheet 53 will not shift relative to the conduction part 521, so as to further improve the user's key pressing feel.

[0143] Continue to refer to Figure 7 , in some embodiments, when each limiting part 523 is arranged at intervals along the extending direction of the circuit board body 52, at least one limiting part 523 may be arranged between at least some adjacent metal elastic sheets 53. In this way, while enhancing the limiting effect of the fixing die 200 on the circuit board body 52 through the cooperation of the multiple limiting parts 523 and the positioning parts 220, the number of the limiting parts 523 and the positioning parts 220 can be reduced, so as to enhance the structural strength of the circuit board body 52 and simplify the structure of the fixing die 200.

[0144] For example, Figure 7 shows that one limiting part 523 may be arranged between any two adjacent ones of the three metal elastic sheets 53. In some embodiments, two limiting parts 523 may be arranged between two of the three metal elastic sheets 53, or no limiting part 523 may be arranged.

[0145] It should be noted that in the application, the position of the limiting portion 523 on the circuit board body 52 can be adjusted according to the distance between two adjacent metal elastic pieces 53 and the size of the limiting portion 523 that can be set on the circuit board body 52. Therefore, in this application, the number of the limiting portions 523 between adjacent metal elastic pieces 53 is not particularly limited.

[0146] Among them, the size of the circuit board body 52 can include the length and width of the circuit board body 52. The direction in which the length of the circuit board body 52 is located is parallel to the length direction Y of the electronic device 100. For the direction in which the width of the circuit board body 52 is located, refer to the relevant description above and will not be elaborated here.

[0147] Figure 10 Schematically shows a partial schematic diagram of the second button assembly. Figure 11 Schematically shows Figure 10 The cross-sectional view of the right region in the B-B direction. Figure 12 Schematically shows Figure 10 The cross-sectional view of the left region in the B-B direction. The difference from the first button assembly is that the second button assembly shows the air guide channel 542 of the button assembly 50, and the second button assembly is provided with an expansion channel 543.

[0148] The following further elaborates on the structure of the second button assembly in conjunction with Figures 10 to 12 Refer to Figures 10 to 12 As shown, the button assembly 50 may further include a reinforcing sheet 54. The reinforcing sheet 54 may be a hard plastic sheet or other hard sheet-like structure. The reinforcing sheet 54 may also be referred to as a spacer.

[0149] Continue to refer to Figure 11 , in some embodiments, the reinforcing sheet 54 may be disposed on the surface of the circuit board body 52 facing the button 51. For example, the reinforcing sheet 54 may be adhered to the circuit board body 52 through a colloid (not shown) to achieve the mounting of the reinforcing sheet 54 on the circuit board body 52. The reinforcing sheet 54 is provided with an avoidance opening 541 at the position corresponding to the metal elastic piece 53. The metal elastic piece 53 is disposed in the corresponding avoidance opening 541. In this way, the structural strength of the button circuit board can be enhanced through the reinforcing sheet 54, and at the same time, it can be ensured that the metal elastic piece 53 can contact the triggering portion 511 of the button 51, so as to realize the button 51 function of the button assembly 50.

[0150] The shape of the avoidance opening 541 matches the shape of the metal elastic piece 53, and the diameter of the avoidance opening 541 may be larger than the size of the metal elastic piece 53, so that while the metal elastic piece 53 is disposed in the avoidance opening 541, there is a gap between the metal elastic piece 53 and the avoidance opening 541 to prevent the avoidance opening 541 from restricting the deformation of the metal elastic piece 53. In this application, the shape of the avoidance opening 541 is not particularly limited.

[0151] Continue to refer to Figure 11 , the reinforcing piece 54 is provided with an air guiding channel 542. The air guiding channel 542 is located on the side of the avoidance opening 541 facing the limiting portion 523 and can communicate with the deformation space 531. So that when the metal elastic piece 53 deforms towards the deformation space 531, the gas in the metal elastic piece 53 can be discharged into the air guiding channel 542 to facilitate the user to press the button 51.

[0152] Wherein, after the metal elastic piece 53 is mounted on the circuit board body 52, it can be partially welded to the circuit board body 52. While realizing the fixation of the metal elastic piece 53 on the circuit board body 52, when the metal elastic piece 53 deforms towards the deformation space 531, the deformation space 531 can communicate with the air guiding channel 542.

[0153] In the related art, a reinforcing piece is provided with an air guiding channel corresponding to the position of a metal elastic piece. Due to the requirements of miniaturization and thinness of electronic devices, the size of the button assembly 50 is limited, which will result in a smaller size of the air guiding channel. And the air guiding channel can be regarded as the exhaust space of the metal elastic piece. If the size of the air guiding channel is small, it will lead to too small an exhaust space for the metal elastic piece. When the user presses the button, the metal elastic piece is still not fully exhausted, which will also cause the user to feel strenuous when pressing the button, and the rebound rate of the button is not high enough, resulting in a poor button feel for the user.

[0154] Therefore, continue to refer to Figure 11 and Figure 12 , the reinforcing piece 54 can also be provided with an expansion channel 543. The reinforcing piece 54 is provided with an expansion channel 543 at the position corresponding to the limiting portion 523, that is to say, the position of the expansion channel 543 corresponds to the position of the limiting portion 523 one by one. For the specific position of the expansion channel 543, reference can be made to the relevant description of the limiting portion 523 above, which will not be elaborated here.

[0155] The limiting portion 523 can communicate with the air guiding channel 542 through the expansion channel 543. In this way, on the basis of the air guiding channel 542, through the setting of the expansion channel 543, the exhaust space of the metal elastic piece 53 can be expanded in the plane where the reinforcing piece 54 is located. When the user presses the button 51, the gas in the metal elastic piece 53 can enter the expansion channel 543 through the air guiding through hole. The metal elastic piece 53 is fully exhausted, the user is more labor-saving when pressing the button 51, and the rebound rate of the button 51 is higher, further improving the user's button feel.

[0156] The plane where the reinforcing piece 54 is located is parallel to the Y-Z plane. The Y-Z plane is the plane formed by the length direction Y and the thickness direction Z of the electronic device 100.

[0157] Moreover, since the limiting part 523 can communicate with the air guide channel 542 through the expansion channel 543, on the basis of the air guide channel 542 and the expansion channel 543, the exhaust space of the metal elastic sheet 53 can be further expanded in the thickness direction X of the button assembly 50 through the limiting part 523. In this way, when the user presses the button 51, the gas in the metal elastic sheet 53 can also enter the limiting part 523 through the expansion channel 543, enhancing the sufficiency of the exhaust of the metal elastic sheet 53. The user exerts less effort when pressing the button 51, the resilience rate of the button 51 is further enhanced, the button 51 can quickly rebound, greatly improving the user's button feel, and the feel value is increased by at least 8.76%.

[0158] Through experimental tests, compared with the existing reinforcing sheet which only has an air guide channel (the size of the air guide channel is the same as that of the air guide channel 542 of the present application), when the limiting part 523 communicates with the air guide channel 542 through the expansion channel 543, the exhaust space of the metal elastic sheet 53 can be expanded by at least 40%. By setting the expansion channel 543 and the limiting part 523, the exhaust space of the metal elastic sheet 53 can be greatly increased, greatly improving the user's button feel.

[0159] It should be noted that the thickness direction X of the button assembly 50 is perpendicular to the plane (Y-Z plane) where the reinforcing sheet 54 is located.

[0160] Continue to refer to Figure 11 , the expansion channel 543 can be the second through hole provided on the reinforcing sheet 54 to communicate the air guide channel 542 and the limiting part 523. The shape of the second through hole can match the shape of the limiting part 523, so that the shape of the second through hole and the shape of the limiting part 523 have a high degree of matching, so as to increase the communication aperture between the limiting part 523 and the air guide channel 542 without changing the sizes of the second through hole and the limiting part 523, thereby increasing the exhaust space of the metal elastic sheet 53. The shape of the second through hole can refer to the relevant description of the shape of the limiting part 523 (the first through hole), which will not be elaborated here.

[0161] Continue to refer to Figure 11 , if the diameter D2 of the second through hole is smaller than the diameter D1 of the limiting part 523 (the first through hole), part of the area of the limiting part 523 will be blocked by the reinforcing sheet 54, the communication aperture between the limiting part 523 and the air guide channel 542 will become smaller, and the structure of the limiting part 523 cannot be effectively utilized during the exhaust process of the metal elastic sheet 53.

[0162] If the diameter D2 of the second through hole is equal to the diameter D1 of the limiting portion 523, due to the existence of tolerances such as the mounting of the reinforcing piece 54 on the circuit board body 52, the second through hole may be offset relative to the limiting portion 523, and part of the region of the limiting portion 523 may still be blocked by the reinforcing piece 54. There will still be a situation where the structure of the limiting portion 523 cannot be effectively utilized during the exhaust process of the metal elastic sheet 53.

[0163] Therefore, in the present application, the diameter D2 of the second through hole can be greater than the diameter D1 of the limiting portion 523, so as to overcome tolerances such as the mounting of the reinforcing piece 54 on the circuit board body 52, so that the limiting portion 523 will not be blocked by the reinforcing piece 54, and the structure of the limiting portion 523 can be effectively and reasonably utilized during the exhaust process of the metal elastic sheet 53, improving the user's key pressing feel.

[0164] Among them, the diameter D2 of the second through hole can be 0.15 mm larger than the diameter D1 of the limiting portion 523, so that the mounting error of the reinforcing piece 54 on the circuit board body 52 is less than 0.1 mm, so as to meet tolerances such as the mounting of the reinforcing piece 54 on the circuit board body 52.

[0165] The thickness of existing electronic devices (mobile phones) is usually about 1 cm. Referring again to Figure 10 , the width W1 of the circuit board body 52 is usually greater than or equal to 3.7 mm and less than or equal to 4.8 mm. Taking the width W1 being greater than or equal to 3.7 mm and less than or equal to 4.8 mm as an example, the diameter D1 of the limiting portion 523 can be greater than or equal to 2.35 mm and less than or equal to 3 mm, and the diameter D2 of the second through hole can be greater than or equal to 2.5 mm and less than or equal to 3.15 mm.

[0166] In some embodiments, the center of the expansion channel 543 can be on the same axis as the center of the limiting portion 523, so that the expansion channel 543 is arranged opposite to the limiting portion 523, thereby further ensuring that the limiting portion 523 will not be blocked by the reinforcing piece 54.

[0167] It should be noted that since the diameter D2 of the second through hole is greater than the diameter D1 of the limiting portion 523, in some other embodiments, on the basis of ensuring that the limiting portion 523 will not be blocked by the reinforcing piece 54, the center of the expansion channel 543 can also be slightly offset relative to the center of the limiting portion 523.

[0168] Continue to refer to Figure 11, the air guide channel 542 can be the openings on both sides of the reinforcing sheet 54 in the thickness direction. That is to say, the air guide channel 542 is the hollowed-out area on the reinforcing sheet 54. Under the condition that the thickness of the reinforcing sheet 54 permits and does not affect the exhaust of the metal elastic sheet 53, the air guide channel 542 can also be the channel inside the reinforcing sheet 54 instead of the hollowed-out area. Taking the air guide channel 542 as an opening as an example below, the structures of the electronic device 100 and the button assembly 50 will be further elaborated.

[0169] Refer to again Figure 10 , the diameter (diameter D2) of the expansion channel 543 can be greater than the opening width W2 of the opening. Or, the diameter (diameter D2) of the expansion channel 543 can also be less than or equal to the opening width W2 of the opening. Compared with the situation where the diameter (diameter D2) of the expansion channel 543 is less than or equal to the opening width W2 of the opening, when the diameter (diameter D2) of the expansion channel 543 is greater than the opening width W2 of the opening, the expansion effect of the expansion channel 543 on the exhaust space of the metal elastic sheet 53 can be further increased.

[0170] In some embodiments, along the width direction of the reinforcing sheet 54:

[0171] There can be a spacing between the expansion channel 543 and the edge 524 of the reinforcing sheet 54 to prevent the expansion channel 543 from being located at the edge 524 of the reinforcing sheet 54.

[0172] If the expansion channel 543 is located at the edge 524 of the reinforcing sheet 54, the structural strength of the reinforcing sheet 54 will be affected, making the reinforcing sheet 54 prone to break at the expansion channel 543. Therefore, when there is a spacing between the expansion channel 543 and the edge 524 of the reinforcing sheet 54 along the width direction of the reinforcing sheet 54, the possibility of the reinforcing sheet 54 breaking at the expansion channel 543 can be reduced.

[0173] Continue to refer to Figure 12 , in some embodiments, when there are multiple metal elastic sheets 53 provided on the circuit board body 52, at least some of the adjacent metal elastic sheets 53 on the opposite sides can be connected through the same expansion channel 543. That is to say, any adjacent metal elastic sheets 53 in the button assembly 50 on the opposite sides can be connected through the same expansion channel 543, or some of the adjacent metal elastic sheets 53 in the button assembly 50 on the opposite sides can be connected through the same expansion channel 543.

[0174] In this way, when the air guide channels 542 of adjacent metal elastic pieces 53 are connected through the same expansion channel 543, when one of the metal elastic pieces 53 deforms into the deformation space 531, the gas in the metal elastic piece 53 can enter the limiting part 523 through the expansion channel 543 and can also enter the air guide channel 542 of the other connected metal elastic piece 53 through the expansion channel 543, thereby further increasing the exhaust space of the metal elastic piece 53 and enhancing the sufficiency of the exhaust of the metal elastic piece 53, so that the user's key pressing feel can be greatly improved. At the same time, the number of expansion channels 543 on the reinforcing piece 54 can be reduced to simplify the structure of the reinforcing piece 54 and ensure the structural strength of the reinforcing piece 54.

[0175] Taking three metal elastic pieces 53 as an example, the connection of the air guide channels 542 on the opposite sides of some adjacent metal elastic pieces 53 through the same expansion channel 543 will be further described below.

[0176] For ease of description, continue to refer to Figure 11 and Figure 12 , and the three metal elastic pieces 53 are respectively defined as the first metal elastic piece 53a, the second metal elastic piece 53b, and the third metal elastic piece 53c. Among them, the first metal elastic piece 53a and the second metal elastic piece 53b can be used as the metal elastic pieces 53 of the volume key 50b (as shown in Figure 12 ), and the third metal elastic piece 53c can be used as the metal elastic piece 53 of the power key 50a (as shown in Figure 11 ).

[0177] Refer to Figure 10 again. Since the distance between the first metal elastic piece 53a and the second metal elastic piece 53b is relatively close, and the circuit board body 52 has a recessed area 526 between the second metal elastic piece 53b and the third metal elastic piece 53c, only one first limiting part 523 can be provided on the side of the circuit board body 52 where the second metal elastic piece 53b faces the third metal elastic piece 53c. Therefore, a second limiting part 523 can be provided between the second metal elastic piece 53b and the first metal elastic piece 53a on the circuit board 31, and an expansion channel 543 can be provided at the position of the reinforcing piece 54 corresponding to the second limiting part 523. And when the air guide channels 542 corresponding to the first metal elastic piece 53a and the second metal elastic piece 53b are both located between the first metal elastic piece 53a and the second metal elastic piece 53b, the two air guide channels 542 of the first metal elastic piece 53a and the second metal elastic piece 53b can be connected through the same expansion channel 543. If the first metal elastic piece 53a deforms into the deformation space 531, the gas in the first metal elastic piece 53a can enter the first limiting part 523 through the expansion channel 543 and can also enter the air guide channel 542 of the second metal elastic piece 53b through the expansion channel 543.

[0178] The air guide channel 542 of the third metal shrapnel 53c can be arranged on the side of the third metal shrapnel 53c facing the first limiting part 523, and another expansion channel 543 can be arranged at the position of the circuit board body 52 at the first limiting part 523. At this time, the air guide channels 542 between the third metal shrapnel 53c and the second metal shrapnel 53b are not communicated with each other.

[0179] It should be noted that the limiting part 523 can include a first limiting part 523 and a second limiting part 523.

[0180] Figure 13 A structural schematic diagram of a sealing film 55 and a reinforcing sheet 54 is shown.

[0181] See Figure 13 As shown, the key assembly 50 further includes a deformable sealing film 55. For example, the sealing film 55 can be a polyester film or other films that can deform. The polyester film can also be called Mylar. The sealing film 55 can cover both sides of the circuit board body 52 in the board thickness direction, and at least the parts of the metal shrapnel 53 and the reinforcing sheet 54 provided with the avoidance openings 541, the air guide channels 542 and the expansion channels 543 are wrapped inside the sealing film 55, so that the sealing film 55 can seal the limiting part 523, the avoidance openings 541, the air guide channels 542, the expansion channels 543, the metal shrapnel 53 and the deformation space 531, ensuring that the circuit board body 52 has good sealing performance at the conduction part 521, so as to prevent liquids or water vapor from entering the inside of the key assembly 50 to corrode the conduction part 521 or the metal shrapnel 53, ensuring the normal use of the key 51 function of the key assembly 50, improving the service life of the key assembly 50, and at the same time, it can also play a role in dust prevention.

[0182] Moreover, when the user presses the key 51, when the gas in the metal shrapnel 53 enters the air guide channel 542, the expansion channel 543 and the limiting part 523, the positions of the sealing film 55 corresponding to the air guide channel 542, the expansion channel 543 and the limiting part 523 can bulge. When the user releases the key 51, the bulged part of the sealing film 55 can deform so that the gas flows back into the deformation space 531. At this time, the metal shrapnel 53 and the key 51 rebound.

[0183] The sealing film 55 can be a whole piece of film. After the metal shrapnel 53 and the reinforcing sheet 54 are both installed on the circuit board body 52, the sealing film 55 can be covered on both sides of the circuit board body 52 in the thickness direction, so that the reinforcing sheet 54 and the metal shrapnel 53 can be wrapped inside the sealing film 55.

[0184] Continue to see Figure 13As shown, when the key assembly 50 includes at least two keys 51, the key assembly 50 may include at least two sealing films 55. The circuit board body 52 can cover a sealing film 55 at the position corresponding to each key 51. In this way, the sealing films 55 are arranged to be disconnected from each other, which facilitates the bending of the circuit board body 52 at the position between adjacent sealing films 55, so as to meet the design requirements for the bending performance of the key assembly 50 of the electronic device 100.

[0185] It should be noted that when the electronic device 100 has low requirements for the bending performance of the key assembly 50, the key assembly 50 may also adopt a single sealing film 55. This sealing film 55 can also cover both sides of the circuit board body 52 in the board thickness direction, so that all the reinforcing sheets 54 and the metal elastic sheets 53 are wrapped by the sealing film 55.

[0186] Figure 14 A partial schematic diagram of the third key assembly is shown. The difference from the second key assembly is that in the third key assembly, the reinforcing sheet 54 is located outside the sealing film 55 and is not wrapped by the sealing film 55.

[0187] The following combines Figure 14 to further elaborate on the differences between the third key assembly and the second key assembly.

[0188] Refer to Figure 14 As shown, in the third key assembly, the metal elastic sheet 53 is wrapped inside the sealing film 55 to seal the deformation space 531. The reinforcing sheet 54 is arranged on the side of the circuit board body 52 facing the key 51 and is pressed outside the sealing film 55. While strengthening the overall strength of the key assembly 50 through the reinforcing sheet 54, it can prevent the sealing film 55 from warping. Moreover, since the reinforcing sheet 54 is pressed outside the sealing film 55, it is not easy for liquids, water vapor, etc. to enter the inside of the sealing film 55, and it can also play a waterproof role.

[0189] In the third type of button assembly, the reinforcing piece 54 is also provided with an avoidance opening 541, a gas guiding channel 542, and a volume expansion channel 543. The difference is that in the third type of button assembly, since the sealing film 55 is blocked between the reinforcing piece 54 and the circuit board body 52, the gas guiding channel 542 is not communicated with the deformation space 531, and the limiting portion 523 is not communicated with the gas guiding channel 542 through the volume expansion channel 543. There is a sealing film 55 blocking between the gas guiding channel 542 and the deformation space 531, and between the volume expansion channel 543 and the gas guiding channel 542. Due to the opening of the gas guiding channel 542 and the volume expansion channel 543, when the user presses the button 51, the gas in the metal elastic piece 53 can be discharged to the position opposite to the gas guiding channel 542 and the volume expansion channel 543 of the sealing film 55, so that the position of the sealing film 55 corresponding to the gas guiding channel 542 and the volume expansion channel 543 can bulge. When the user releases the button 51, the bulge of the sealing film 55 can be deformed so that the gas can flow back into the deformation space 531. At this time, the metal elastic piece 53 and the button 51 can rebound.

[0190] At the same time, due to the setting of the limiting portion 523, when the user presses the button 51, the gas in the metal elastic piece 53 can also be discharged into the limiting portion 523, so that the position of the sealing film 55 corresponding to the limiting portion 523 can bulge at the same time. When the user releases the button 51, the bulged part of the sealing film 55 can be deformed so that the gas can flow back into the deformation space 531 through it. At this time, the metal elastic piece 53 and the button 51 can rebound.

[0191] Therefore, the third type of button assembly can also greatly increase the exhaust space of the metal elastic piece 53 and greatly improve the button feel of the user.

[0192] For the third type of button assembly, after the metal elastic piece 53 is welded to the circuit board body 52, the sealing film 55 needs to be first mounted on the circuit board body 52 so that the sealing film 55 wraps both sides of the circuit board body 52 in the thickness direction and wraps the metal elastic piece 53 inside. Then, the reinforcing piece 54 is mounted on the circuit board body 52 by glue so that the reinforcing piece 54 is pressed on the outside of the sealing film 55.

[0193] To verify the effect of the improvement of the button feel of the button assembly 50 of the present application, the present application sets up a test group and a control group, and conducts two pressing tests on the button assemblies 50 of the test group and the control group respectively, and obtains a hand feel elastic force curve graph. Among them, the test group and the control group both use the button assembly 50 of the same model. The difference is that the button assembly 50 of the test group is provided with a volume expansion channel 543 and a limiting portion 523, and the button assembly 50 of the control group is not provided with a volume expansion channel 543 and a limiting portion 523.

[0194] Figure 15The tactile elastic force curve diagram of the button assembly 50 of the control group is shown. Figure 16 The tactile elastic force curve diagram of the button assembly 50 of the test group is shown. Among them, Figure 15 and Figure 16 In, the abscissa represents the stroke of the button 51, with the unit of millimeter (mm), and the ordinate represents the force value, with the unit of gram (g). Figure 15 and Figure 16 The data at the top in shows the stroke of the button 51 and the data of the force value in the pressing test.

[0195] Refer to Figure 15 and Figure 16 As shown, both the control group and the test group have two tactile elastic force curve diagrams, representing two pressing tests on the control group and the test group. Among them, the 8-1 group and the 9-1 group are the first pressing tests of the control group and the test group, and the 22-1 or 23-1 group is the second pressing test of the control group and the test group.

[0196] First, taking the first pressing test as an example, the tactile elastic force curve diagram will be described below.

[0197] Each tactile elastic force curve diagram has a red curve and a black curve. The red curve represents a pressure curve when the button 51 is pressed down, and the black curve represents a pressure curve when the button 51 rebounds. This application mainly focuses on the red curve.

[0198] Continue to refer to Figure 15 , for the red curve of the control group:

[0199] pk1: 194.803 0.119, which means that when the button 51 is pressed to 0.119 mm, a large force value of 194.803 g appears. In the button 51 industry, the force value corresponding to pk1 can be regarded as the peak value of the button force value;

[0200] bt1: 95.631 0.22, which means that the force value when the deformation of the button 51 is pressed to the bottom is 95.631 g, and the stroke of the button 51 is 0.22 mm. In the button 51 industry, the force value corresponding to bt1 can be regarded as the valley point of the button force value;

[0201] ck: represents the click ratio, commonly known as the tactile value of the button 51. The calculation formula of the tactile value is (the force value of pk1 - the force value of bt1) / the force value of pk1. In the button 51 industry, when ck is between 30% and 60%, it is considered that the button tactile feeling is okay. Within this range, the larger ck is, the better the button tactile feeling is. Correspondingly, ck is 50.909%.

[0202] Continue to refer to Figure 16 , for the red curve of the test group:

[0203] For pk1: 192.341 at 0.110, it means that when the button 51 is pressed to 0.110 mm, a large force value of 192.341 g appears;

[0204] For bt1: 77.572 at 0.225, it means that the force value when the deformation of the button 51 is pressed to the bottom is 77.572 g, and the stroke of the button 51 is 0.225 mm;

[0205] For ck: 59.669%.

[0206] It can be seen that in the first pressing test, through the settings of the expansion channel 543 and the limiting part 523 in this application, the feel value of the button assembly 50 is increased from 50.909% to 59.669%, an increase of 8.76%.

[0207] For the first pressing test, ck in the red curve of the control group is 50.376%, and ck in the red curve of the test group is 59.925%. It can be seen that in the second pressing test, through the settings of the expansion channel 543 and the limiting part 523 in this application, the feel value of the button assembly 50 is increased from 50.376% to 59.925%, an increase of 9.549%.

[0208] In summary, through the settings of the expansion channel 543 and the limiting part 523 in this application, the bt1 value of the button assembly 50 in the test group is greatly improved, making the trough point of the button force value smaller, enabling the user to use less force to make the metal shrapnel 53 reach the maximum deformation value. The exhaust space of the metal shrapnel 53 is large and the exhaust is sufficient, and it can quickly rebound, which can greatly provide the user with the feel of pressing the button, and the feel value is increased by at least 8.76%, providing a better tactile feedback for the user.

[0209] In the description of the embodiments of this application, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, or an indirect connection through an intermediate medium, or the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of this application can be understood according to specific situations.

[0210] The terms "first", "second", "third", "fourth", etc. (if any) in the description and claims of the embodiments of this application and the above drawings are used to distinguish similar objects, and do not necessarily need to describe a specific order or sequence.

Claims

1. A key component, characterized in that, Comprising: A key; A key circuit board, including a circuit board body and a metal shrapnel. A conduction part is provided at a position on the board surface of the circuit board body corresponding to the key. The metal shrapnel is mounted on the circuit board body and covers the side of the conduction part facing the key, and a deformation space is provided on the side of the metal shrapnel facing the conduction part. Wherein, the metal shrapnel is configured to be deformed into the deformation space when the key is pressed and conduct with the conduction part; Wherein, a limiting part is provided on the board surface of the circuit board body on the side of the metal shrapnel. The limiting part is configured to cooperate with a positioning part on a fixing mold when the circuit board body is embedded in the fixing mold.

2. The key assembly according to claim 1, characterized in that, The metal shrapnel has a projection area on the board surface of the circuit board body, and the limiting part is located outside the projection area.

3. The key assembly according to claim 2, wherein, A wiring area is provided between the limiting part and the edge of the circuit board body.

4. The key assembly according to claim 3, wherein The center of the limiting part and the center of the conduction part are both located on the central axis of the circuit board body in the width direction.

5. The key assembly according to claim 1, wherein The number of the keys is at least two, and at least one conduction part is provided at a position on the circuit board body corresponding to each key; The conduction parts are arranged at intervals along the extending direction of the circuit board body. Metal shrapnels are correspondingly provided at positions on the circuit board body corresponding to each conduction part. Limiting parts are provided on the peripheries of the metal shrapnels. The limiting parts are configured to each correspond to a positioning part in the fixing mold.

6. The key assembly according to claim 4, characterized in that, One conduction part is provided between at least some adjacent metal shrapnels.

7. The key assembly according to any one of claims 1-6, characterized in that The limiting part is a first through hole through which the positioning part can pass, and the shape of the first through hole matches the shape surrounded by the peripheral contour of the positioning part.

8. The key assembly according to claim 7, wherein, Further comprising: A reinforcing sheet, provided on the surface of the circuit board body facing the key. An avoidance opening is provided on the reinforcing sheet at a position corresponding to the metal shrapnel, and the metal shrapnel is provided in the corresponding avoidance opening; Wherein, the reinforcing sheet is provided with an air guiding channel and an expansion channel. The air guiding channel is located on the side of the avoidance opening facing the limiting part and can be communicated with the deformation space; The reinforcing sheet is provided with the expansion channel at a position corresponding to the limiting part, and the limiting part is communicated with the air guiding channel through the expansion channel.

9. The key assembly according to claim 8, wherein, The expansion channel is a second through hole provided on the reinforcing sheet, and the shape of the second through hole matches the shape of the limiting part.

10. The key assembly according to claim 9, characterized in that, The diameter of the second through hole is larger than the diameter of the limiting part.

11. The key assembly according to claim 10, characterized in that, The center of the expansion channel and the center of the limiting part are located on the same axis.

12. The key assembly according to claim 8, wherein, The air guiding channel is an opening penetrating through both sides of the reinforcing sheet in the thickness direction, and the diameter of the expansion channel is larger than the opening width of the opening.

13. The key assembly according to claim 12, wherein Along the width direction of the reinforcing sheet: A spacing is provided between the expansion channel and the edge of the reinforcing sheet.

14. The key assembly according to claim 8, wherein, At least some adjacent metal shrapnels have the two air guiding channels on the facing sides communicated through the same expansion channel.

15. The key assembly according to claim 8, characterized in that, Further comprising: A deformable sealing film covers both sides of the circuit board body in the board thickness direction, and at least the portions of the metal elastic sheet and the reinforcing sheet where the avoidance opening, the air guiding channel and the expansion channel are provided are wrapped inside the sealing film.

16. The key assembly according to claim 7, characterized in that, Further included are: A deformable sealing film covers both sides of the circuit board body in the board thickness direction, and the metal elastic sheet is wrapped inside the sealing film; A reinforcing sheet is provided on the surface of the circuit board body facing the key and presses against the outside of the sealing film; the reinforcing sheet is provided with an avoidance opening at a position corresponding to the metal elastic sheet, and the metal elastic sheet is arranged in the corresponding avoidance opening; Wherein, the reinforcing sheet is provided with an air guiding channel and an expansion channel, and the air guiding channel is located on the side of the avoidance opening facing the limiting portion; the reinforcing sheet is provided with the expansion channel at a position corresponding to the limiting portion.

17. An electronic device, characterized in that, It includes a housing and the key assembly according to any one of claims 1-16, the key assembly is installed on the side wall of the housing, and a part of the key in the key assembly is exposed on the appearance surface of the housing.

18. A fixed mold, characterized in that, It includes a mold body and a positioning portion, the mold body has a groove body, and the shape of the groove body matches the shape of the circuit board body in the key assembly according to any one of claims 1-16; the positioning portion is arranged at the bottom of the groove body and corresponds to the position of the limiting portion of the circuit board body in the key assembly according to any one of claims 1-16.

19. The fixed mold according to claim 18, wherein The positioning portion is a convex column at the bottom of the groove body, and the convex column is configured to be penetrable into the limiting portion.

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