An electronic device

Abstract

The present application provides an electronic device, comprising a middle frame, a main circuit board and a key module; the middle frame is provided with a accommodating cavity, a mounting hole and a conductive part, and the mounting hole is connected to the outside of the electronic device and the accommodating cavity; the key module comprises a flexible circuit board, a plurality of keys and a plurality of first conductive members; the main circuit board, the flexible circuit board, a part of each key and the first conductive member are all arranged in the accommodating cavity; the ground wire of the flexible circuit board and the ground wire of the main circuit board are respectively electrically connected to the conductive part; along the thickness direction of the electronic device, the flexible circuit board is stacked on the main circuit board, the first conductive member is arranged between the flexible circuit board and the main circuit board, and the flexible circuit board and the main circuit board are electrically connected through the first conductive member; a part of the key is arranged on the flexible circuit board, and another part of the key passes through the mounting hole and extends to the outside of the electronic device; the plurality of keys are respectively electrically connected to the plurality of first conductive members through the flexible circuit board.

Description

Technical Field

[0001] The present application relates to the technical field of electronic products, and in particular to an electronic device. Background Art

[0002] Electronic devices are essential products in modern daily production and life. In order to facilitate users to operate electronic devices, electronic devices are generally provided with a button module, which generally includes a power button, a volume increase button, and a volume decrease button.

[0003] Usually, a mounting hole is set on the side of the electronic device, and the key module is installed in the mounting hole, so that a part of the key module is located inside the electronic device so that the key module can be electrically connected to the main circuit board, etc., and the other part of the key module extends from the mounting hole to the outside of the electronic device so that the key module can be operated by the user.

[0004] However, since there is a gap between the empty wall surface of the mounting hole and the key module, the gap may cause liquids such as water to enter the interior of the electronic device, thereby causing electrochemical corrosion of the electrical components inside the electronic device. Summary of the invention

[0005] The present application provides an electronic device, which reduces the risk of electrochemical corrosion of internal electrical components of the electronic device.

[0006] The electronic device provided in the present application includes: a middle frame, a main circuit board and a key module. It can be understood that the electronic device also includes a display screen and a back cover. The display screen and the back cover are respectively arranged on opposite sides of the middle frame.

[0007] The middle frame is provided with a receiving cavity, a mounting hole and a conductive part, and the mounting hole is connected to the outside of the electronic device and the receiving cavity. The key module includes a flexible circuit board, a plurality of keys and a plurality of first conductive parts. The number of keys is the same as the number of first conductive parts. The main circuit board, the flexible circuit board, a part of each key and the first conductive part are all arranged in the receiving cavity. The ground wire of the flexible circuit board and the ground wire of the main circuit board are electrically connected to the conductive part respectively. Along the thickness direction of the electronic device, a part of the flexible circuit board is stacked on the main circuit board, the first conductive part is arranged between the flexible circuit board and the main circuit board, and the flexible circuit board and the main circuit board are electrically connected through the first conductive part. It can be understood that in order to avoid interference between two adjacent first conductive parts, a space needs to be reserved between any two adjacent first conductive parts.

[0008] A part of the key is arranged on another part of the flexible circuit board, and another part of the key passes through the mounting hole and extends to the outside of the electronic device. The plurality of keys are electrically connected to the plurality of first conductive members respectively through the flexible circuit board.

[0009] In the related art, in addition to setting multiple first conductive members between the stacked areas of the flexible circuit board and the main circuit board, a first grounding member is also required. One end of the first grounding member is electrically connected to the ground wire of the flexible circuit board, and the other end of the first grounding member is electrically connected to the ground wire of the main circuit board, so that the main circuit board and the flexible circuit board share a common ground.

[0010] However, in the above-mentioned design scheme of the related art, because the area where the main circuit board and the flexible circuit board are stacked is very limited, the distance between the two adjacent first conductive parts and between the adjacent first grounding parts and the first conductive parts are very small. In addition, due to the influence of factors such as processing and assembly errors, falling or impact when the user uses the electronic device, the sealing of the gap between the key and the hole wall of the mounting hole decreases, which can easily cause liquids such as water to enter the interior of the accommodating cavity from the gap. Under the premise that the distance between the liquid entering the accommodating cavity and the two adjacent first conductive parts is very small, if there is a voltage difference between the two adjacent first conductive parts at this time, even a small amount of liquid will cause a conductive channel to be formed between the two adjacent first conductive parts, thereby causing electrochemical corrosion of the first conductive parts. Similarly, under the premise that the distance between the liquid entering the accommodating cavity and the adjacent first conductive parts and the first grounding parts is very small, if there is a voltage difference between the adjacent first conductive parts and the first grounding parts, even a small amount of liquid will cause a conductive channel to be formed between the adjacent first conductive parts and the first grounding parts, thereby causing electrochemical corrosion of the first conductive parts and / or the first grounding parts.

[0011] In the present application, by setting at least part of the middle frame as a conductive part, and making the ground wire of the flexible circuit board and the ground wire of the main circuit board electrically connected through the conductive part of the middle frame, the common ground of the flexible circuit board and the main circuit board can be achieved without setting the first grounding member. Only the first conductive member needs to be set at the stacking place of the flexible circuit board and the main circuit board. Compared with the scheme of setting the first conductive member and the first grounding member between the flexible circuit board and the main circuit board, the distance between two adjacent first conductive members is significantly increased. After the distance between two adjacent first conductive members is increased, even if liquid enters the accommodating cavity, it is difficult to cause a conductive channel to be formed between the two adjacent first conductive members, thereby reducing the risk of electrochemical corrosion of the first conductive members.

[0012] Optionally, the middle frame includes a middle plate and a frame body, the frame body surrounds the outer periphery of the middle plate and is fixedly connected to the middle plate. The middle plate and the frame body enclose a receiving cavity, and the mounting hole is provided in the frame body. At least part of the middle plate and / or at least part of the frame body forms a conductive part. By using the structure of the middle plate and / or the frame body to form the conductive part, there is no need to set additional components, thereby reducing the number of parts of the electronic device, saving the internal space of the electronic device, and facilitating the thin and light design of the electronic device.

[0013] Optionally, at least part of the middle plate forms a conductive part, and the ground wire of the flexible circuit board and the middle plate are stacked so that the ground wire of the flexible circuit board and a part of the conductive part are stacked and contacted, so that the ground wire of the flexible circuit board and the conductive part are electrically connected. Thus, the ground wire of the flexible circuit board and the conductive part are electrically connected, and the structural compactness of the electronic device is improved.

[0014] Optionally, the ground wire and the conductive part of the flexible circuit board are fixed by bonding with conductive adhesive, which can improve the stability of the electrical connection between the ground wire and the conductive part of the flexible circuit board.

[0015] Optionally, at least a portion of the middle plate forms a conductive portion, and the ground wire of the main circuit board and the middle plate are stacked so that the ground wire of the main circuit board and another portion of the conductive portion are stacked and contacted, so that the ground wire of the main circuit board and the conductive portion are electrically connected. Thus, the ground wire of the main circuit board and the conductive portion are electrically connected, and the structural compactness of the electronic device is improved.

[0016] Optionally, the flexible circuit board includes a first connection portion, a bending portion, and a second connection portion connected in sequence. The first connection portion is parallel to a plane formed by a length direction and a thickness direction of the electronic device, and the second connection portion is parallel to a plane formed by a length direction and a width direction of the electronic device. The first connection portion is opposite to the mounting hole, and at least part of the second connection portion is stacked on the main circuit board. The button is arranged on the first connection portion, and the first conductive member is arranged on the second connection portion. A part of the button needs to extend from the mounting hole on the side of the electronic device, and another part of the button needs to be electrically connected to the main circuit board. This structure of the flexible circuit board can make the button smoothly electrically connected to the main circuit board.

[0017] Optionally, the flexible circuit board further includes an extension portion, the extension portion is connected to the first connection portion, and the extension portion is parallel to a plane formed by the length direction and the width direction of the electronic device. Along the thickness direction of the electronic device, the ground line of the flexible circuit board is arranged on the extension portion, and the extension portion is laminated and fixed to the conductive portion so that the ground line of the flexible circuit board and a part of the conductive portion are laminated and contacted. In this way, the flexible circuit board and the main circuit board can be grounded through the conductive portion without affecting the original line arrangement of the flexible circuit board.

[0018] Optionally, there are multiple extension parts, and the multiple extension parts are arranged at intervals along the length direction of the electronic device, thereby increasing the stability of the grounding of the flexible circuit board.

[0019] Optionally, the ground line of the flexible circuit board is arranged on at least one of the first connecting portion, the bending portion and the second connecting portion.

[0020] Optionally, the plurality of buttons include a power button, a volume increase button, and a volume decrease button. There are three first conductive members, and the three first conductive members are electrically connected to the power button, the volume increase button, and the volume decrease button through a flexible circuit board. The power button can realize functions such as power on, power off, display screen wake-up, and display screen off. The volume increase button and the volume decrease button can realize the function of adjusting the volume.

[0021] Optionally, the key includes a keycap, a conductive spring and an auxiliary circuit board, the auxiliary circuit board is stacked and connected to the flexible circuit board, the edge portion of the conductive spring is fixed to the auxiliary circuit board, and there is a gap between the middle portion of the conductive spring and the auxiliary circuit board. The keycap is located on the side of the conductive spring away from the auxiliary circuit board, and a portion of the keycap is located in the accommodating cavity, and another portion of the keycap passes through the mounting hole and extends to the outside of the electronic device.

[0022] When the user presses the keycap, the keycap squeezes the conductive spring sheet, so that the gap between the middle part of the conductive spring sheet and the auxiliary circuit board disappears, that is, the middle part of the conductive spring sheet contacts the auxiliary circuit board. At this time, the level signal of the auxiliary circuit board changes, and the level signal is transmitted to the chip on the main circuit board through the flexible circuit board, the first conductive member and the second conductive member. The chip can then perform corresponding operations, such as turning on, off, increasing or decreasing the volume, etc.

[0023] Optionally, a second conductive member is provided on a side of the main circuit board facing the flexible circuit board, and the second conductive member is in contact with the first conductive member.

[0024] Optionally, the first conductive member and the second conductive member are both spring sheets. The first conductive member and the second conductive member can abut against each other to achieve reliable electrical connection.

[0025] Optionally, the ground wire of the flexible circuit board includes a copper layer located on the outer surface of the flexible circuit board. The ground wire of the main circuit board includes a copper layer located on the outer surface of the main circuit board. It can be understood that both the flexible circuit board and the main circuit board include copper layers and insulating layers that are alternately arranged, and usually, the first layer and the last layer of the flexible circuit board are both insulating layers. By setting a hollow area on the first or last insulating layer, a part of the copper layer is exposed, that is, a part of the copper layer is located on the outer surface of the flexible circuit board, and the exposed part of the copper layer can be the ground wire of the flexible circuit board. Similarly, a hollow area is set on the first or last insulating layer of the main circuit board, so that a part of the copper layer is exposed, that is, a part of the copper layer is located on the outer surface of the main circuit board, and the exposed part of the copper layer is the ground wire of the main circuit board. That is, the ground wire can be formed by using the structure of the flexible circuit board and the main circuit board itself, so that the flexible circuit board and the main circuit board are respectively in contact with the conductive part, so that the ground wire of the flexible circuit board and the ground wire of the main circuit board are respectively electrically connected to the conductive part, which can improve the structural compactness of the electronic device. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the background technology, the drawings required for use in the embodiments of the present application or the background technology will be described below.

[0027] Figure 1 It is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application.

[0028] Figure 2 yes Figure 1 Schematic diagram of the split structure of the electronic device shown in.

[0029] Figure 3 yes Figure 1 A partial structural schematic diagram of a specific embodiment of an electronic device is shown in FIG.

[0030] Figure 4 yes Figure 3 Schematic diagram of the split structure.

[0031] Figure 5 yes Figure 1 Another partial structural schematic diagram of a specific embodiment of an electronic device is shown in .

[0032] Figure 6 yes Figure 1 A partial structural schematic diagram of another specific embodiment of an electronic device is shown in FIG.

[0033] Figure 7 yes Figure 6 Schematic diagram of the split structure.

[0034] Figure 8 yes Figure 1 Another partial structural schematic diagram of another specific embodiment of an electronic device is shown in FIG.

[0035] Explanation of the reference numerals: 1000 - electronic device, 10 - main body, 20 - display screen, 30 - outer shell, 31 - middle frame, 311 - conductive part, 32 - back cover, 33 - middle plate, 34 - frame, 35 - inner surface, 36 - outer surface, 37 - accommodating cavity, 371 - first part, 372 - second part, 373 - accommodating groove, 38 - mounting hole, 39 - raised part, 40 - main circuit board, 41 - second conductive part, 42 - second grounding part, 50 - battery, 60 - button module, 70 - flexible circuit board, 71 - first connecting part, 72 - bending part, 73 - second connecting part, 74 - extension part, 80 - button, 80a - volume increase button, 80b - volume decrease button, 80c - power button, 81 - keycap, 82 - conductive spring, 83 - auxiliary circuit board, 90 - first conductive part, 91 - first grounding part. DETAILED DESCRIPTION

[0036] The embodiments of the present application are described below in conjunction with the drawings in the embodiments of the present application.

[0037] The present application embodiment provides an electronic device, referring to Figure 1 and Figure 2 , Figure 1 is a schematic diagram of the structure of an electronic device 1000 provided in an embodiment of the present application, Figure 2 yes Figure 1 Schematic diagram of the split structure of the electronic device 1000 is shown in FIG.

[0038] For ease of description, the width direction of the foldable electronic device 1000 is defined as the X-axis direction, the length direction of the foldable electronic device 1000 is defined as the Y-axis direction, and the thickness direction of the foldable electronic device 1000 is defined as the Z-axis direction. The X-axis direction, the Y-axis direction, and the Z-axis direction are perpendicular to each other.

[0039] The electronic device 1000 includes, but is not limited to, earphones, cell phones, notebook computers, tablet personal computers, personal digital assistants, wearable devices, mobile devices, drones, speakers, etc. In this embodiment, the electronic device 1000 is described as a mobile phone.

[0040] The electronic device 1000 includes a body 10 and a display screen 20. The display screen 20 may be a rigid display screen 20 or a flexible display screen 20. The display screen 20 includes a display surface and a mounting surface. The display surface and the mounting surface are arranged opposite to each other. The display surface is used to display text, images, and videos. The display screen 20 is mounted on the body 10, and the mounting surface is fixedly connected to the body 10, and the display surface is away from the body 10.

[0041] The body 10 includes an outer shell 30, a main circuit board 40, a battery 50 and a key module 60. The outer shell 30 includes a middle frame 31 and a back cover 32, and the middle frame 31 includes a middle plate 33 and a frame 34. The frame 34 is a rectangular frame, and the frame 34 surrounds the outer periphery of the middle plate 33 and is fixedly connected to the middle plate 33. The middle plate 33 and the frame 34 can be integrally formed, or they can be separately formed and then fixedly connected by welding or fasteners. The middle plate 33 and the frame 34 enclose a receiving cavity 37. The frame 34 includes an inner surface 35 and an outer surface 36 opposite to each other, the outer surface 36 is a part of the appearance surface of the outer shell 30, and the inner surface 35 is the cavity wall surface of the receiving cavity 37. The middle frame 31 is provided with mounting holes 38, and the mounting holes 38 are arranged in sequence along the extension direction of the middle frame 31. The mounting holes 38 pass through the inner surface 35 and the outer surface 36 of the frame 34, and the mounting holes 38 are connected to the receiving cavity 37.

[0042] The main circuit board 40 and the battery 50 are both installed in the accommodating cavity 37, and the middle plate 33 can support the main circuit board 40 and the battery 50. The back cover 32 is fixed to the frame 34, and the back cover 32 can close the accommodating cavity 37. The back cover 32 can protect the main circuit board 40 and the battery 50, and can improve the aesthetics of the electronic device 1000. The display screen 20 is installed on the side of the frame 34 away from the back cover 32.

[0043] The button module 60 is installed in the mounting hole 38. Specifically, a portion of the button module 60 is located in the accommodating cavity 37, the portion of the button module 60 located in the accommodating cavity 37 is electrically connected to the main circuit board 40, and another portion of the button module 60 is located outside the outer shell 30 for user operation.

[0044] In some embodiments, reference Figure 3 and Figure 4 , Figure 3 yes Figure 1 A partial structural diagram of a specific embodiment of an electronic device 1000 is shown in FIG. Figure 4 yes Figure 3 The key module 60 includes a flexible printed circuit 70 (FPC), a plurality of keys 80, a plurality of first conductive members 90 and a first grounding member 91.

[0045] The flexible circuit board 70 is disposed in the accommodating cavity 37 , and the flexible circuit board 70 includes a first connecting portion 71 , a bending portion 72 , and a second connecting portion 73 that are sequentially connected.

[0046] The multiple buttons 80 can all be mechanical buttons 80, where multiple refers to more than two. The multiple buttons 80 can include a volume increase button 80a, a volume decrease button 80b, and a power button 80c. The power button 80c can realize functions such as power on, power off, waking up the display screen 20, and turning off the display screen 20. The volume increase button 80a and the volume decrease button 80b can realize the function of adjusting the volume. Of course, in other embodiments, the multiple buttons 80 can include any two of the volume increase button 80a, the volume decrease button 80b, and the power button 80c.

[0047] Continue to refer Figure 3 and Figure 4 The key 80 may include a keycap 81, a conductive spring 82 and an auxiliary circuit board 83. The conductive spring 82 may be a pot piece (demo). The auxiliary circuit board 83 is stacked on the first connecting portion 71. The edge of the conductive spring 82 is attached to the surface of the auxiliary circuit board 83 away from the first connecting portion 71. There is a gap between the middle part of the conductive spring 82 and the auxiliary circuit board 83. The keycap 81 is located on the side of the conductive spring 82 away from the auxiliary circuit board 83, and a part of the keycap 81 is located inside the accommodating cavity 37, and the other part of the keycap 81 passes through the mounting hole 38 and extends to the outside of the accommodating cavity 37. In order to increase the aesthetics, the keycap 81 of the volume increase key 80a and the keycap 81 of the volume decrease key 80b can be integrally formed. Figure 3 and Figure 4 The key cap 81 of the volume increase key 80a and the key cap 81 of the volume decrease key 80b are distinguished by dotted lines. Figure 3 and Figure 4 The dividing lines in are for illustration only.

[0048] The first conductive member 90 and the first grounding member 91 can both be springs, and the first conductive member 90 and the first grounding member 91 are both arranged on the second connecting portion 73, and the first conductive member 90 is electrically connected to the second connecting portion 73. The button 80 includes a power button 80c, a volume increase button 80a, and a volume decrease button 80b. Each button 80 includes a first conductive member 90, so there can be three first conductive members 90, and the three first conductive members 90 are electrically connected to the three auxiliary circuit boards 83 through the flexible circuit board 70. The three first conductive members 90 and the first grounding member 91 are arranged at intervals along the Y-axis direction. The three first conductive members 90 are all electrically connected to the chip on the main circuit board 40. The chip can be a power management chip or a voice chip. The first grounding member 91 contacts the ground wire on the main circuit board 40.

[0049] refer to Figure 5 , Figure 5 yes Figure 1Another partial structural schematic diagram of a specific embodiment of the electronic device 1000 is shown in . A second conductive member 41 and a second grounding member 42 are provided on the main circuit board 40, and both the second conductive member 41 and the second grounding member 42 can be springs. There are three second conductive members 41, and the three second conductive members 41 and the second grounding member 42 are arranged at intervals along the Y-axis direction. The second conductive member 41 is electrically connected to the chip on the main circuit board 40, and the second grounding member 42 is electrically connected to the ground wire of the main circuit board 40. The three second conductive members 41 are respectively abutted against the three first conductive members 90 to realize the electrical connection between the auxiliary circuit board 83 and the main circuit board 40, and the second grounding member 42 is abutted against the first grounding member 91 to make the flexible circuit board 70 and the main circuit board 40 share the same ground.

[0050] Taking the power button 80c as an example, the working principle of the button 80 is explained. When the user needs to turn on the device, the key cap 81 is pressed, and the key cap 81 squeezes the conductive spring 82, so that the gap between the middle part of the conductive spring 82 and the auxiliary circuit board 83 disappears, that is, the middle part of the conductive spring 82 is in contact with the auxiliary circuit board 83. At this time, the level signal of the auxiliary circuit board 83 changes, and the level signal is transmitted to the power management chip on the main circuit board 40 through the flexible circuit board 70, the first conductive member 90 and the second conductive member 41. The power management chip can control the electronic device 1000 to turn on. The working principle of the volume increase button 80a and the volume decrease button 80b is similar to that of the power button 80c, and will not be repeated in the embodiment of the present application.

[0051] In the above embodiments, reference Figure 5 Due to processing and assembly errors, the influence of factors such as the drop or impact of the electronic device 1000 when the user uses it, the sealing performance of the gap between the key cap 81 and the hole wall of the mounting hole 38 is reduced, which causes liquids such as water to enter the interior of the accommodation cavity 37 through the gap. In addition, the stacking area of ​​the main circuit board 40 and the flexible circuit board 70 is very limited, resulting in a very small distance L between two adjacent first conductive members 90 and between adjacent first grounding members 91 and first conductive members 90. Usually, the distance L is about 0.5 mm.

[0052] Under the premise that the distance between the liquid entering the accommodating cavity 37 and the two adjacent first conductive members 90 is very small, if there is a voltage difference between the two adjacent first conductive members 90 at this time, even a small amount of liquid will cause a conductive channel to be formed between the two adjacent first conductive members 90, thereby causing electrochemical corrosion of the first conductive members 90. Similarly, under the premise that the distance between the liquid entering the accommodating cavity 37 and the adjacent first conductive members 90 and the first grounding member 91 is very small, if there is a voltage difference between the adjacent first conductive members 90 and the first grounding member 91, even a small amount of liquid will cause a conductive channel to be formed between the adjacent first conductive members 90 and the first grounding member 91, thereby causing electrochemical corrosion of the first conductive members 90 and / or the first grounding member 91.

[0053] In order to prevent the first conductive member 90 from being corroded, in some other embodiments of the present application, Figure 6 and Figure 7 , Figure 6 yes Figure 1 A partial structural diagram of another specific embodiment of an electronic device 1000 is shown in FIG. Figure 7 yes Figure 6 The middle frame 31 is provided with a conductive portion 311, and the conductive portion 311 is made of conductive metal. Figure 6 and Figure 7 The shaded portion in the middle schematically shows the conductive portion 311. In fact, the conductive portion 311 may not be limited to the shaded portion. Figure 6 and Figure 7 The above is only exemplary. Specifically, the entire area of ​​the middle frame 31 is made of conductive metal, or part of the middle frame 31 is made of conductive metal to form a conductive part 311. The middle frame 31 includes a middle plate 33 and a frame 34, and the conductive part 311 can be arranged on the middle plate 33 and / or the frame 34. For example, part or all of the middle plate 33 is made of conductive metal, and the frame 34 is made of hard plastic. Alternatively, the middle plate 33 and the frame 34 are all made of conductive metal. Alternatively, part or all of the frame 34 is made of conductive metal, and the middle plate 33 is made of hard plastic. Alternatively, part or all of the middle plate 33 is made of conductive metal, and part or all of the frame 34 is made of conductive metal. The conductive part 311 is formed by the structure of the middle plate 33 and / or the frame 34, without the need to set additional components, reducing the number of parts of the electronic device 1000, and saving the internal space of the electronic device 1000, which is conducive to the thin and light design of the electronic device 1000.

[0054] refer to Figure 6 and Figure 7, a protrusion 39 is provided at the edge of the middle plate 33, one side of the protrusion 39 and the upper surface of the middle plate 33 enclose the first part 371 of the accommodating cavity 37, and a receiving groove 373 is recessed at the bottom of the first part 371 of the accommodating cavity 37. The other side of the protrusion 39 and the frame 34 enclose the second part 372 of the accommodating cavity 37, and the second part 372 of the accommodating cavity 37 is connected to the mounting hole 38. Specifically, the second part 372 of the accommodating cavity 37 can be provided at the protrusion 39, and the inner surface 35 of the frame 34 covers the opening of the second part 372 of the accommodating cavity 37. The first part 371 of the accommodating cavity 37 is used to install the main circuit board 40 and the battery 50, and the receiving groove 373 at the bottom of the accommodating cavity 37 is used to accommodate a part of the key module 60. The second part 372 of the accommodating cavity 37 is used to accommodate another part of the key module 60. Part or all of the protrusion 39 can be used to form the conductive part 311. In other embodiments, the second portion 372 of the accommodating cavity 37 may be disposed on the frame 34, and the protrusion 39 covers the opening of the second portion 372 of the accommodating cavity 37. Alternatively, the middle plate 33 is not provided with the protrusion 39, and the second portion 372 of the accommodating cavity 37 may be disposed on the frame 34.

[0055] refer to Figure 6 and Figure 7 The key module 60 includes a flexible printed circuit 70 (FPC), a plurality of keys 80 and a plurality of first conductive members 90. The number of keys 80 is the same as the number of first conductive members 90. The main circuit board 40, the flexible circuit board 70, a portion of each key 80 and the first conductive members 90 are all disposed in the accommodating cavity 37. The ground wire of the flexible circuit board 70 and the ground wire of the main circuit board 40 are electrically connected to the conductive portion 311 respectively, that is, the ground wire of the flexible circuit board 70 contacts the conductive portion 311 of the middle frame 31, and the conductive portion 311 of the middle frame 31 is electrically connected to the ground wire of the main circuit board 40, thereby realizing the common ground of the main circuit board 40 and the flexible circuit board 70.

[0056] It can be understood that both the flexible circuit board 70 and the main circuit board 40 include copper layers and insulating layers that are alternately arranged, and usually, the first layer and the last layer of the flexible circuit board 70 are both insulating layers. By setting a hollow area on the first or last insulating layer, a portion of the copper layer is exposed, that is, a portion of the copper layer is located on the outer surface 36 of the flexible circuit board 70, and the exposed portion of the copper layer can be the ground wire of the flexible circuit board 70. Similarly, a hollow area is set on the first or last insulating layer of the main circuit board 40, so that a portion of the copper layer is exposed, that is, a portion of the copper layer is located on the outer surface 36 of the main circuit board 40, and the exposed portion of the copper layer is the ground wire of the main circuit board 40.

[0057] The ground wire of the flexible circuit board 70 can be bonded to the conductive part 311 of the middle frame 31 by conductive glue. To increase the stability of the electrical connection between the ground wire and the conductive part 311 of the flexible circuit board 70. When the main circuit board 40 is installed in the accommodating cavity 37, the ground wire of the main circuit board 40 can directly contact the conductive part 311 of the middle frame 31, or it can indirectly contact the conductive part 311 of the middle frame 31 through other adapters, thereby realizing the common ground of the main circuit board 40 and the flexible circuit board 70. In detail, the ground wire of the flexible circuit board 70 and the middle plate 33 are stacked so that the ground wire of the flexible circuit board 70 and a part of the conductive part 311 are stacked and contacted, so that the ground wire of the flexible circuit board 70 and the conductive part 311 are electrically connected. As a result, while the ground wire of the flexible circuit board 70 and the conductive part 311 are electrically connected, the structural compactness of the electronic device 1000 is improved. The ground wire of the main circuit board 40 and the middle board 33 are stacked so that the ground wire of the main circuit board 40 and another part of the conductive part 311 are stacked and contacted, so that the ground wire of the main circuit board 40 and the conductive part 311 are electrically connected. Thus, the ground wire of the main circuit board 40 and the conductive part 311 are electrically connected, and the compactness of the structure of the electronic device 1000 is improved.

[0058] refer to Figure 6 and Figure 7 The flexible circuit board 70 includes a first connection portion 71, a bending portion 72, and a second connection portion 73 connected in sequence. The first connection portion 71 and the second connection portion 73 are perpendicular to each other, and the bending portion 72 is used to connect the first connection portion 71 and the second connection portion 73. The first connection portion 71 is parallel to the plane formed by the Y-axis direction and the Z-axis direction, and the second connection portion 73 is parallel to the plane formed by the Y-axis direction and the X-axis direction. The flexible circuit board 70 also includes an extension portion 74, which is connected to the first connection portion 71, and at least part of the copper layer of the extension portion 74 is exposed to form a ground line of the flexible circuit board 70. The extension portion 74 is bent relative to the first connection portion 71, and the extension portion 74 is parallel to the plane formed by the Y-axis direction and the X-axis direction.

[0059] When the flexible circuit board 70 is disposed in the accommodating cavity 37, the first connecting portion 71 is disposed in the second portion 372 of the accommodating cavity 37, and the first connecting portion 71 can be bonded to the inner side surface of the second portion 372 of the accommodating cavity 37 by adhesive, specifically, the first connecting portion 71 is bonded to the inner side surface of the second portion 372 of the accommodating cavity 37 opposite to the mounting hole 38. The second connecting portion 73 can be bonded to the accommodating groove 373 by adhesive, and the bent portion 72 turns over the spacing portion between the first portion 371 and the second portion 372 of the accommodating cavity 37, so that the first connecting portion 71 and the second connecting portion 73 are reliably connected. The extension portion 74 is stacked on the upper surface of the protrusion 39, and is bonded and fixed to the upper surface of the protrusion 39 by conductive adhesive. It can be understood that the portion where the protrusion 39 of the middle plate 33 and the extension portion 74 are bonded and fixed is at least part of the conductive portion 311, thereby achieving indirect contact and electrical connection between the ground wire of the flexible circuit board 70 and the conductive portion 311.

[0060] By providing the extension part 74 and providing the ground wire of the flexible circuit board 70 on the extension part 74, it is convenient to bond and fix the ground wire of the flexible circuit board 70 to the conductive part 311 of the middle frame 31. In this way, the flexible circuit board 70 and the main circuit board 40 can be grounded through the conductive part 311 without affecting the original line arrangement of the flexible circuit board 70. It can be understood that there can be one or more extension parts 74. When there are more than two extension parts 74, multiple extension parts 74 are arranged in sequence along the Y-axis direction. For example, there can be two, three, four or five extension parts 74, etc., which can increase the stability of the grounding of the flexible circuit board 70.

[0061] In some other embodiments, the flexible circuit board 70 may not be provided with the extension portion 74. In this case, the ground line of the flexible circuit board 70 is provided on at least one of the first connection portion 71, the bending portion 72, and the second connection portion 73. In some other embodiments, the ground line of the flexible circuit board 70 is provided on at least one of the first connection portion 71, the bending portion 72, the second connection portion 73, and the extension portion 74.

[0062] The first conductive member 90 may be a spring sheet, and the first conductive member 90 is disposed on the second connecting portion 73, and the first conductive member 90 and the second connecting portion 73 are electrically connected. The first conductive member 90 and the second connecting portion 73 are both located in the receiving groove 373, and the main circuit board 40 is stacked on the upper surface of the middle plate 33 and covers the receiving groove 373. The first conductive member 90 may extend out of the receiving groove 373 to facilitate electrical connection with the main circuit board 40. That is, the second connecting portion 73 and the main circuit board 40 are stacked along the Z-axis direction, and the first conductive member 90 is located between the main circuit board 40 and the second connecting portion 73 of the flexible circuit board 70, and the flexible circuit board 70 and the main circuit board 40 are electrically connected through the first conductive member 90.

[0063] It can be understood that in some embodiments, reference Figure 8 , Figure 8 yes Figure 1 Another partial structural diagram of another specific embodiment of the electronic device 1000 is shown in FIG. A second conductive member 41 is provided on the main circuit board 40, and the second conductive member 41 can be a spring. The second conductive member 41 abuts against the first conductive member 90 to achieve electrical connection between the flexible circuit board 70 and the main circuit board 40.

[0064] refer to Figure 6 and Figure 7 , a part of the key 80 is arranged on another part of the flexible circuit board 70, and another part of the key 80 passes through the mounting hole 38 and extends to the outside of the electronic device 1000. Multiple keys 80 are electrically connected to multiple first conductive members 90 through the flexible circuit board 70. Specifically, the key 80 may include a keycap 81, a conductive spring 82 and an auxiliary circuit board 83, and the conductive spring 82 may be a pot piece (demo). The auxiliary circuit board 83 is stacked on the first connecting portion 71, and the edge portion of the conductive spring 82 is attached to the surface of the auxiliary circuit board 83 away from the first connecting portion 71, and there is a gap between the middle portion of the conductive spring 82 and the auxiliary circuit board 83. The keycap 81 is located on the side of the conductive spring 82 away from the auxiliary circuit board 83, and a part of the keycap 81 is located inside the accommodating cavity 37, and another part of the keycap 81 passes through the mounting hole 38 and extends to the outside of the accommodating cavity 37.

[0065] refer to Figure 6 , Figure 7 and Figure 8 The buttons 80 include a power button 80c, a volume increase button 80a, and a volume decrease button 80b. Each button 80 includes a first conductive member 90. Therefore, there may be three first conductive members 90, and the three first conductive members 90 are electrically connected to the three auxiliary circuit boards 83 through the flexible circuit board 70. The three first conductive members 90 are arranged at intervals along the Y-axis direction. The three first conductive members 90 are electrically connected to the chip on the main circuit board 40. The chip may be a power management chip or a voice chip. Correspondingly, there are three second conductive members 41, and the three second conductive members 41 are arranged at intervals along the Y-axis direction, and the second conductive members 41 are electrically connected to the chip on the main circuit board 40. The three second conductive members 41 are respectively abutted against the three first conductive members 90 to realize the electrical connection between the auxiliary circuit board 83 and the main circuit board 40.

[0066] In some of the above embodiments, by setting at least a portion of the middle frame 31 as the conductive portion 311, and making the ground wire of the flexible circuit board 70 and the ground wire of the main circuit board 40 electrically connected through the conductive portion 311 of the middle frame 31, it is not necessary to set the first grounding member 91 and the second grounding member 42, so that the common ground of the flexible circuit board 70 and the main circuit board 40 can be achieved. Only three first conductive members 90 are required at the stacking position of the flexible circuit board 70 and the main circuit board 40, refer to Figure 8 , the distance L1 between the three first conductive members 90 is about 1.49 mm. Compared with the region where the three first conductive members 90 and the first grounding member 91 are all arranged in the stacked region of the flexible circuit board 70 and the main circuit board 40, the distance between two adjacent first conductive members 90 is significantly increased. After the distance between two adjacent first conductive members 90 is increased, even if liquid enters the accommodating cavity 37, it is difficult to form a conductive channel between the two adjacent first conductive members 90, thereby reducing the risk of electrochemical corrosion of the first conductive members 90.

[0067] The above are only some embodiments and implementation methods of the present application, and the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by any person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. An electronic device, characterized in that: include: Middle frame, main circuit board and button module; The middle frame is provided with a receiving cavity, a mounting hole and a conductive part, wherein the mounting hole is connected to the outside of the electronic device and the receiving cavity; the key module includes a flexible circuit board, a plurality of keys and a plurality of first conductive members; the key module is not provided with a first grounding member; The main circuit board, the flexible circuit board, a part of each of the buttons and the first conductive members are all arranged in the accommodating cavity; the ground wire of the flexible circuit board and the ground wire of the main circuit board are electrically connected to the conductive part respectively; The flexible circuit board is stacked on the main circuit board along the thickness direction of the electronic device, the first conductive member is arranged between the flexible circuit board and the main circuit board, and the flexible circuit board and the main circuit board are electrically connected through the first conductive member; a plurality of the first conductive members are arranged at intervals along the length direction of the electronic device, and a distance between two adjacent first conductive members is greater than a distance between two adjacent first conductive members when the key module is provided with the first grounding member; A portion of the button is disposed on the flexible circuit board, and another portion of the button passes through the mounting hole and extends to the outside of the electronic device; a plurality of the buttons are electrically connected to a plurality of the first conductive members respectively through the flexible circuit board.

2. The electronic device according to claim 1, characterized in that: The middle frame includes a middle plate and a frame body, wherein the frame body surrounds the outer periphery of the middle plate and is fixedly connected to the middle plate; the middle plate and the frame body enclose the accommodating cavity; at least part of the middle plate and / or at least part of the frame body forms the conductive part.

3. The electronic device according to claim 2, characterized in that: At least a portion of the middle plate forms the conductive part, and the ground wire of the flexible circuit board and the middle plate are stacked so that the ground wire of the flexible circuit board and the conductive part are stacked and contacted, so that the ground wire of the flexible circuit board and the conductive part are electrically connected.

4. The electronic device according to claim 3, characterized in that: The ground wire of the flexible circuit board and the conductive part are bonded and fixed by conductive adhesive.

5. The electronic device according to claim 2, characterized in that: At least a portion of the middle plate forms the conductive part, and the ground wire of the main circuit board and the middle plate are stacked so that the ground wire of the main circuit board and the conductive part are in stacked contact, so that the ground wire of the main circuit board and the conductive part are electrically connected.

6. The electronic device according to any one of claims 1 to 5, characterized in that: The flexible circuit board comprises a first connecting portion, a bending portion and a second connecting portion connected in sequence; The first connecting portion is parallel to a plane formed by a length direction and a thickness direction of the electronic device, and the second connecting portion is parallel to a plane formed by a length direction and a width direction of the electronic device; the first connecting portion is opposite to the mounting hole, and at least a portion of the second connecting portion is stacked on the main circuit board; the button is arranged on the first connecting portion, and the first conductive member is arranged on the second connecting portion.

7. The electronic device according to claim 6, characterized in that: The flexible circuit board also includes an extension portion, which is connected to the first connection portion; along the thickness direction of the electronic device, the ground wire of the flexible circuit board is arranged on the extension portion, and the extension portion is laminated and fixed to the conductive portion so that the ground wire of the flexible circuit board and a part of the conductive portion are laminated and contacted.

8. The electronic device according to claim 7, characterized in that: There are a plurality of the extending portions, and the plurality of the extending portions are arranged at intervals along the length direction of the electronic device.

9. The electronic device according to claim 6, characterized in that: The ground line of the flexible circuit board is arranged on at least one of the first connecting portion, the bending portion and the second connecting portion.

10. The electronic device according to any one of claims 1 to 5, characterized in that: The plurality of buttons include a power button, a volume up button, and a volume down button; There are three first conductive members, and the three first conductive members are electrically connected to the power button, the volume increase button, and the volume decrease button respectively through the flexible circuit board.

11. The electronic device according to any one of claims 1 to 5, characterized in that: The key includes a keycap, a conductive spring and an auxiliary circuit board, the auxiliary circuit board is stacked and connected to the flexible circuit board, the edge portion of the conductive spring is fixed to the auxiliary circuit board, and there is a gap between the middle portion of the conductive spring and the auxiliary circuit board. The keycap is located on the side of the conductive spring away from the auxiliary circuit board, and a portion of the keycap is located in the accommodating cavity, and another portion of the keycap passes through the mounting hole and extends to the outside of the electronic device.

12. The electronic device according to any one of claims 1 to 5, characterized in that: A second conductive member is disposed on a side of the main circuit board facing the flexible circuit board, and the second conductive member is in contact with the first conductive member.

13. The electronic device according to claim 12, characterized in that: The first conductive member and the second conductive member are both spring sheets.

14. The electronic device according to any one of claims 1 to 5, characterized in that: The ground wire of the flexible circuit board includes a copper layer located on the outer surface of the flexible circuit board; the ground wire of the main circuit board includes a copper layer located on the outer surface of the main circuit board.

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