Electronic device

Abstract

The invention relates to an electronic device. The electronic device comprises a first substrate, a second substrate, a sensor, a cover body, a waterproof net and an outer cover, the first substrate comprises a first inner cavity and a through hole communicated with the first inner cavity. The second substrate is stacked on the first substrate and comprises a second inner cavity and a straight airflow channel communicated with the first inner cavity. The sensor is arranged on the first substrate, covers the through hole and is provided with a back cavity. The cover body is arranged on the second substrate and covers the second inner cavity. The cover body comprises an opening. The waterproof net covers the opening. The outer cover is arranged on the cover body and forms a drainage cavity with the cover body. The outer cover comprises a first hole and a second hole which enable the drainage cavity to be communicated with the outside, and the first hole and the second hole are opened in a staggered mode.

Description

Technical Field

[0001] This application relates to an electronic device, and more particularly to an electronic device having a drainage cavity. Background Art

[0002] The housing of a common electronic device (such as a device having a microphone or a pressure sensor) usually has an opening to communicate the air inside the cavity with the outside. In addition, a waterproof net is provided on the opening to prevent dust or water droplets from entering the cavity of the electronic device. However, when the electronic device is impacted by a strong water flow, the waterproof net cannot completely block the high-pressure impact of the water flow, so that part of the water flow will enter the cavity through the opening, thereby affecting the operation of the electronic device. How to prevent the water flow from entering the cavity is one of the research goals of researchers in this field. Summary of the Invention

[0003] This application provides an electronic device, the cover of which can reduce the probability of external water flow entering the first inner cavity or the second inner cavity.

[0004] The electronic device of this application includes a first substrate, a second substrate, a sensor, a cover, a waterproof net, and an outer cover. The first substrate includes a first inner cavity and a through hole communicating with the first inner cavity. The second substrate is stacked on the first substrate and includes a second inner cavity and a straight air flow channel communicating with the first inner cavity. The sensor is disposed on the first substrate and covers the through hole, and the sensor has a back cavity. The cover is disposed on the second substrate and covers the second inner cavity, and the cover includes an opening. The waterproof net covers the opening. The outer cover is disposed on the cover and forms a drainage cavity with the cover. The outer cover includes a first hole and a second hole for communicating the drainage cavity with the outside, and the first hole and the second hole are staggered from the opening.

[0005] In an embodiment of this application, the above-mentioned second inner cavity and the straight air flow channel are horizontally arranged above the first inner cavity, and the cover extends to cover the straight air flow channel.

[0006] In an embodiment of this application, the above-mentioned opening is correspondingly disposed on the second inner cavity.

[0007] In an embodiment of this application, the above-mentioned opening is correspondingly disposed on the straight air flow channel.

[0008] In an embodiment of this application, the above-mentioned first inner cavity and the second inner cavity are both within the vertical projection range of the drainage cavity on the first substrate, and the second inner cavity is sandwiched between the first inner cavity and the drainage cavity.

[0009] In an embodiment of this application, the above-mentioned drainage cavity includes a transverse drainage channel, and the waterproof net is located on the transverse drainage channel.

[0010] In an embodiment of the present application, the distance between the cover body and the top wall of the outer cover is between 0.1 millimeter and 1 millimeter.

[0011] In an embodiment of the present application, the above-mentioned opening, first hole, and second hole face the same direction.

[0012] In an embodiment of the present application, the above-mentioned first substrate includes a bottom layer and a top layer, and a through hole is formed on the top layer and communicates with the back cavity.

[0013] In an embodiment of the present application, the above-mentioned first inner cavity includes a transverse air flow channel formed between the bottom layer and the top layer, and the air in the back cavity flows to the straight air flow channel through the transverse air flow channel.

[0014] In an embodiment of the present application, the above-mentioned first substrate includes a plurality of inner support members located in the first inner cavity and connected to the bottom layer and the top layer.

[0015] In an embodiment of the present application, the aperture of each of the above-mentioned first hole and second hole is greater than 50 micrometers.

[0016] The electronic device of the present application includes a first substrate, a second substrate, a sensor, a cover body, and an outer cover. The first substrate includes a first inner cavity and a through hole communicating with the first inner cavity. The second substrate is stacked on the first substrate and includes a second inner cavity. The sensor is disposed on the first substrate and covers the through hole, and the sensor has a back cavity. The cover body is disposed on the second substrate and covers the second inner cavity. The outer cover is disposed on the cover body and includes an outer cover top wall and an outer cover side wall, wherein a transverse drainage channel is formed at an interval between the outer cover top wall and the cover body, and a straight drainage channel is formed at an interval between the outer cover side wall and the second substrate. The transverse drainage channel and the straight drainage channel jointly define a drainage cavity, and the outer cover includes a first hole and a second hole for communicating the drainage cavity with the outside.

[0017] In an embodiment of the present application, the above-mentioned cover body includes an opening and a waterproof net covering the opening, and the first hole and the second hole are staggered from the opening.

[0018] In an embodiment of the present application, the above-mentioned first substrate includes an opening communicating with the first inner cavity and a waterproof net covering the opening.

[0019] In an embodiment of the present application, the above-mentioned first hole and second hole face the same direction and are commonly and correspondingly disposed on the transverse drainage channel.

[0020] In an embodiment of the present application, the above-mentioned first hole and second hole face different directions and are respectively correspondingly disposed on the transverse drainage channel and the straight drainage channel.

[0021] In an embodiment of the present application, the above-mentioned second inner cavity and the straight drainage channel are horizontally arranged on the first substrate.

[0022] Based on the above, the outer cover of the electronic device of the present application is disposed on the cover body, and the outer cover has a first hole and a second hole. The first hole and the second hole are staggered from the opening. In this way, when a relatively high-pressure water flow impacts the outer cover, the waterproof net will not be directly impacted by the high-pressure water flow and damaged, thereby reducing the probability of the high-pressure water flow entering the inside of the first inner cavity or the second inner cavity through the opening. Description of the Drawings

[0023] Figure 1 is a schematic cross-sectional view of an electronic device according to a first embodiment of the present application.

[0024] Figure 2 is a schematic cross-sectional view of an electronic device according to a second embodiment of the present application.

[0025] Figure 3 is a schematic cross-sectional view of an electronic device according to a third embodiment of the present application.

[0026] Figure 4 is a schematic cross-sectional view of an electronic device according to a fourth embodiment of the present application.

[0027] Description of the Reference Numerals in the Drawings:

[0028] 100, 100a, 100b, 100c: Electronic devices;

[0029] 110: First substrate;

[0030] 111: First inner cavity;

[0031] 1112: Lateral air flow channel;

[0032] 112: Bottom layer;

[0033] 113: Top layer;

[0034] 114: Through hole;

[0035] 115: Inner support member;

[0036] 116: Electrode layer;

[0037] 117c: Opening;

[0038] 118: Internal circuit layer;

[0039] 120: Second substrate;

[0040] 122: Second inner cavity;

[0041] 124: Straight air flow channel;

[0042] 130: Sensor;

[0043] 132: Membrane;

[0044] 134: Back cavity;

[0045] 140, 140a, 140c: Cover body;

[0046] 142, 142a: Opening;

[0047] 150: Waterproof net;

[0048] 160, 160b: Outer cover;

[0049] 162: First hole;

[0050] 164, 164b: Second hole;

[0051] 166: Top wall of the outer cover;

[0052] 168: Side wall of the outer cover;

[0053] 170: Control chip;

[0054] C: Drainage cavity;

[0055] C1: Lateral drainage channel;

[0056] C2: Straight drainage channel;

[0057] d, d1, d2: Hole diameter;

[0058] L1, L2: Length;

[0059] P, P1: Drainage flow channel. Detailed implementation manner

[0060] Figure 1 is a cross-sectional schematic view of an electronic device according to the first embodiment of the present application. Please refer to Figure 1 , the electronic device 100 of this embodiment is, for example, a microphone device or a pressure sensor, but the present application does not limit the type of the electronic device 100.

[0061] The electronic device 100 of this embodiment includes a first substrate 110, a second substrate 120, and a sensor 130. The first substrate 110 includes a first inner cavity 111. The second substrate 120 is stacked on the first substrate 110 and includes a second inner cavity 122. The sensor 130 is disposed on the first substrate 110 and located in the second inner cavity 122, and the sensor 130 has a back cavity 134.

[0062] Specifically, the second substrate 120 includes a direct air flow channel 124 that communicates with and is perpendicular to the first inner cavity 111. The second inner cavity 122 and the direct air flow channel 124 are horizontally arranged above the first inner cavity 111, and the direct air flow channel 124 is located on the side of the second inner cavity 122.

[0063] Furthermore, the first substrate 110 of the present embodiment includes a bottom layer 112, a top layer 113, and a through hole 114 formed on the top layer 113. The first inner cavity 111 is located between the bottom layer 112 and the top layer 113, and the top layer 113 is located between the second inner cavity 122 and the first inner cavity 111. The sensor 130 covers the through hole 114, and the through hole 114 communicates with the first inner cavity 111 and the back cavity 134. That is, the first inner cavity 111 communicates with the back cavity 134 through the through hole 114.

[0064] By providing that the first inner cavity 111 formed by the bottom layer 112 and the top layer 113 communicates with the back cavity 134, the first inner cavity 111 serves as a part of the cavity of the sensor 130, enabling the sensor 130 to have a larger cavity. In this way, the sensor 130 can effectively improve the performance of the acoustic signal-to-noise ratio.

[0065] Specifically, in the present embodiment, the sensor 130 includes, for example, a MEMS chip, which can be applied to microphones, bone conduction vibration sensors, barometers, etc., but the type of the sensor 130 is not limited thereto. The sensor 130 includes a membrane 132, and the sensor 130 can convert the deformation generated by the membrane 132 into an electrical signal.

[0066] In addition, the control chip 170 is disposed on the first substrate 110 and is located in the second inner cavity 122. The control chip 170 is electrically connected to the sensor 130 and the first substrate 110. Specifically, the sensor 130 is connected to the control chip 170 by wire bonding, for example, and the control chip 170 is connected to the internal circuit layer 118 of the first substrate 110 by wire bonding, for example. The control chip 170 is an ASIC chip, for example, but the present application is not limited thereto.

[0067] In addition, the first inner cavity 111 includes a transverse air flow channel 1112. The transverse air flow channel 1112 is formed between the bottom layer 112 and the top layer 113, and the air in the back cavity 134 flows to the direct air flow channel 124 through the transverse air flow channel 1112, enabling the back cavity of the sensor 130 to be expanded through the design of extending the air flow channel.

[0068] In the present embodiment, the first substrate 110 includes a plurality of inner supports 115 (shown as two), which are located in the first inner cavity 111 and are connected to the bottom layer 112 and the top layer 113. The inner supports 115 can enhance the overall rigidity of the first substrate 110.

[0069] The electronic device 100 of this embodiment includes a cover body 140 and a waterproof net 150. The cover body 140 is disposed on the second substrate 120 and covers the second inner cavity 122, and the cover body 140 includes an opening 142. The waterproof net 150 covers the opening 142 to prevent external water flow or dust from entering the second inner cavity 122, thereby avoiding affecting the sensing performance of the sensor 130. The cover body 140 can be a metal cover or a printed circuit board, and the present application is not limited thereto.

[0070] In this embodiment, the cover body 140 extends from the second inner cavity 122 to cover the straight air flow channel 124, and the opening 142 is provided on the cover body 140 and is correspondingly provided on the second inner cavity 122. That is, the external air pressure (such as sound pressure) will enter the second inner cavity 122 from the opening 142, causing the film 132 of the sensor 130 to be deformed under pressure.

[0071] The electronic device 100 of this embodiment includes an outer cover 160. The outer cover 160 is disposed on the cover body 140 to form a drainage cavity C with the cover body 140. The drainage cavity C includes a transverse drainage channel C1, and the waterproof net 150 is located on the transverse drainage channel C1. Both the first inner cavity 111 and the second inner cavity 122 are within the vertical projection range of the drainage cavity C on the first substrate 110, and the second inner cavity 122 is sandwiched between the first inner cavity 111 and the drainage cavity C.

[0072] In this embodiment, the outer cover 160 includes a first hole 162 and a second hole 164 that communicate the drainage cavity C with the outside. The part of the drainage cavity C between the first hole 162 and the second hole 164 serves as a drainage flow path P, and the waterproof net 150 is located on the drainage flow path P.

[0073] In addition, the first hole 162 and the second hole 164 are, for example, provided on the top wall 166 of the outer cover of the outer cover 160. In other embodiments, one of the first hole 162 and the second hole 164 can be provided on the side wall 168 of the outer cover, or both the first hole 162 and the second hole 164 are provided on the side wall 168 of the outer cover, and the present application is not limited thereto.

[0074] As Figure 1 shown, when water flow impacts the outer cover 160, the first hole 162 serves as a water inlet hole, and the second hole 164 serves as a drainage hole, for example. The water flow is adapted to enter from the water inlet hole (such as the first hole 162) and flow along the drainage flow path P, and then the water flow is discharged to the outside from the drainage hole (such as the second hole 164). Of course, the first hole 162 and the second hole 164 can also be a drainage hole and a water inlet hole respectively to drain the water flow entering the drainage flow path P.

[0075] In this embodiment, the first hole 162 and the second hole 164 are staggered from the opening 142. When a relatively high-pressure water flow impacts the outer cover 160, since the first hole 162 and the second hole 164 are staggered from the opening 142, the waterproof net 150 will not be directly impacted by the high-pressure water flow and damaged, and the probability of water flowing into the interior of the second inner cavity 124 from the opening 142 can be reduced.

[0076] In addition, the double-hole design of the outer cover 160 of this embodiment, having a water inlet hole and a drain hole (i.e., the first hole 162 and the second hole 164), can release the dynamic water pressure of the water flow and can also keep the water pressure balanced in the drain cavity C, so that the water flow can smoothly drain to the outside from the drain hole.

[0077] In this embodiment, the outer cover 160 defines a flow path of the drain channel P between the vertical projection of the first hole 162 onto the drain cavity C and the vertical projection of the second hole 164 onto the drain cavity C. Among them, the length L1 of the flow path of the drain channel P is greater than the aperture d of the opening 142, the length L1 of the drain channel P is greater than or equal to more than half of the length L2 of the cover body 140, and the length L1 of the drain channel P is greater than 0.2 times of the length L2 of the cover body 140. In addition, there is a spacing between the cover body 140 and the top wall 166 of the outer cover ranging from 0.1 millimeter to 1 millimeter. Through the above design, a certain flow path can be ensured. When the high-pressure water flow enters the drain cavity C, the dynamic water pressure is released to a certain extent to prevent the water pressure in the drain cavity C from being too high and causing damage to the waterproof net 150.

[0078] In addition, the first substrate 110 of this embodiment further includes a plurality of electrode layers 116, which are disposed on the first substrate 110 and on the other side relative to the outer cover 160. The electronic device 100 of this embodiment can be electrically connected to and disposed on other devices (such as a vehicle body) through the electrode layers 116. The electronic device 100 of this embodiment is adapted to be disposed on other devices in a flip-chip manner (i.e., Figure 1 in an upside-down state) through the electrode layers 116. At this time, the first hole 162 and the second hole 164 are located at the lower part of the overall electronic device 100. Such a setting method can make the water flow in the drain cavity C move downward due to gravity, so that the water flow can quickly drain to the outside from the first hole 162 or the second hole 164 below.

[0079] It is worth mentioning that the opening 142, the first hole 162 and the second hole 164 of this embodiment face the same direction (such as Figure 1 the up-and-down direction). Such a design can help external sounds enter the first inner cavity 111, the back cavity 134 and the second inner cavity 122 smoothly from the first hole 162, the second hole 164 and the opening 142. In other embodiments, the opening 142, the first hole 162 and the second hole 164 can also face different directions, and the present application is not limited thereto.

[0080] In addition, the aperture diameters d1 and d2 of each of the first hole 162 and the second hole 164 are greater than 50 microns to ensure that when sound enters the first inner cavity 111, the back cavity 134, the direct air flow channel 124, and the second inner cavity 122 from the first hole 162, the second hole 164, and the opening 142, the acoustic characteristics of the sound are not affected. Specifically, the aperture diameters d1 and d2 of each of the first hole 162 and the second hole 164 being greater than 50 microns can effectively prevent the electronic device 100 from generating a resonance frequency in the audible frequency range (between 20 Hz and 20 kHz), and can avoid the electronic device 100 from generating a sharp sound, thereby avoiding affecting the user experience.

[0081] It should be added that the present application does not limit the number of holes provided on the outer cover 160, as long as it is ensured that the number of holes provided on the outer cover 160 is greater than two, so that water can smoothly enter and exit the drainage cavity C, and all the holes are staggered from the opening 142. However, when the number of holes provided on the outer cover 160 increases, the amount of dust entering the drainage cavity C will also increase accordingly. Therefore, the number of holes on the outer cover 160 should not be too many.

[0082] Figure 2 is a cross-sectional schematic view of an electronic device according to the second embodiment of the present application. Please refer to Figure 2 , the main difference between the electronic device 100a of this embodiment and the Figure 1 electronic device 100 is that, in this embodiment, the cover body 140a extends to cover the direct air flow channel 124. The opening 142a is correspondingly provided on the direct air flow channel 124 and communicates with the direct air flow channel 124 and the drainage cavity C, and the waterproof net 150 is located between the direct air flow channel 124 and the drainage cavity C.

[0083] Specifically, as Figure 2 shown, the cover body 140a can be partially located on the direct air flow channel 124, and the opening 142a on the cover body 140a is aligned with the direct air flow channel 124. External sound will enter the drainage cavity C from the first hole 162 or the second hole 164, and after passing through the opening 142a, the direct air flow channel 124, the first inner cavity 111, and the back cavity 134 of the sensor 130 in sequence, the membrane 132 of the sensor 130 is pressed to deform.

[0084] In addition, the first hole 162 and the second hole 164 of this embodiment are staggered from the opening 142. External water can enter and exit the drainage cavity C from the first hole 162 and the second hole 164, and the waterproof net 150 will not be directly impacted by external high-pressure water flow and damaged, thereby reducing the probability of water flow entering the direct air flow channel 124 from the opening 142a.

[0085] Figure 3A cross-sectional schematic view of an electronic device according to a third embodiment of the present application. Please refer to Figure 3 , the main difference between the electronic device 100b of this embodiment and the Figure 1 electronic device 100 is that, in this embodiment, a horizontal drainage channel C1 is formed at an interval between the top wall 166 of the outer cover and the cover body 140, and a vertical drainage channel C2 is formed at an interval between the side wall 168 of the outer cover and the second substrate 120. The mutually perpendicular horizontal drainage channel C1 and the vertical drainage channel C2 jointly define a drainage cavity C, and the first hole 162 and the second hole 164b face different directions.

[0086] Specifically, the first hole 162 of this embodiment is provided on the top wall 166 of the outer cover 160b, and the first hole 162 is provided in the horizontal drainage channel C1. The second hole 164b is provided between the side wall 168 of the outer cover 160b and the first substrate 110, and the second hole 164b is provided in the vertical drainage channel C2. In addition, the waterproof net 150 is located on the horizontal drainage channel C1.

[0087] With such a setting, the drainage flow path P1 has a turn, and the dynamic water pressure of the high-pressure water flow entering the drainage cavity C can be further released, so as to avoid damage to the waterproof net 150 due to excessive water flow pressure in the drainage cavity C, and further reduce the probability of water flow entering the interior of the second inner cavity 122 from the opening 142.

[0088] In addition, the electronic device 100b of this embodiment is adapted to be mounted on other devices (i.e., Figure 3 in the state) through the electrode layer 116. At this time, the first hole 162 is located at a high position of the overall electronic device 100b, and the second hole 164b is located at a low position of the overall electronic device 100b. Such a setting method can make the water flow in the drainage cavity C move downward due to gravity, so that the water flow flows from the upper first hole 162 to the lower second hole 164b and is quickly discharged to the outside.

[0089] Figure 4 A cross-sectional schematic view of an electronic device according to a fourth embodiment of the present application. Please refer to Figure 4 , the main difference between the electronic device 100c of this embodiment and the Figure 2 electronic device 100a is that, in this embodiment, the first substrate 110 includes an opening 117c communicating with the first inner cavity 111 and a waterproof net 150 covering the opening 117c.

[0090] Specifically, the drainage cavity C of this embodiment has a transverse drainage channel C1 and a longitudinal drainage channel C2. The first hole 162 and the second hole 164 are both provided on the transverse drainage channel C1, and the opening 117c and the waterproof net 150 are located in the longitudinal drainage channel C2. The opening 117c communicates with the first inner cavity 111 and the longitudinal drainage channel C2, and the waterproof net 150 is located between the first inner cavity 111 and the longitudinal drainage channel C2 and covers the opening 117c. That is to say, the opening 117c of this embodiment is not formed on the cover 140c, but on the first substrate 110.

[0091] Similar to Figure 2 the electronic device 100a, the first hole 162 and the second hole 164 of this embodiment are staggered from the opening 117c. External water flow can enter and exit the drainage cavity C through the first hole 162 and the second hole 164, and the waterproof net 150 will not be directly impacted by the external high-pressure water flow and damaged, thereby reducing the probability of water flow entering the first inner cavity 111 from the opening 117c.

[0092] In addition, external sound will enter the transverse drainage channel C1 through the first hole 162 or the second hole 164, and then pass through the longitudinal drainage channel C2, the opening 117c, the first inner cavity 111 and the back cavity 134 of the sensor 130 in sequence. After that, the external sound enters the second inner cavity 122 through the membrane 132 of the sensor 130.

[0093] In summary, the outer cover of the electronic device of this application is provided on the cover, and the outer cover has a first hole and a second hole. The first hole and the second hole are staggered from the opening. In this way, when a relatively high-pressure water flow impacts the outer cover, the waterproof net will not be directly impacted by the high-pressure water flow and damaged, thereby reducing the probability of the high-pressure water flow entering the first inner cavity or the second inner cavity.

[0094] In addition, through the setting that the first inner cavity formed by the bottom layer and the top layer of the electronic device of this application communicates with the back cavity of the sensor, the first inner cavity serves as a part of the cavity of the sensor, so that the sensor has a larger cavity. In this way, the sensor can effectively improve the performance of the acoustic signal-to-noise ratio.

Claims

1. An electronic device, characterized in that, Comprising: A first substrate, comprising a first inner cavity and a through hole communicating with the first inner cavity; A second substrate, stacked on the first substrate, and comprising a second inner cavity and a straight air flow channel communicating with the first inner cavity; A sensor, disposed on the first substrate and covering the through hole, the sensor having a back cavity; A cover body, disposed on the second substrate and covering the second inner cavity, the cover body comprising an opening; A waterproof net, covering the opening; and An outer cover, disposed on the cover body, and forming a drainage cavity with the cover body, the outer cover comprising a first hole and a second hole for communicating the drainage cavity with the outside, the first hole and the second hole being offset from the opening.

2. The electronic device according to claim 1, characterized in that, The second inner cavity and the straight air flow channel are horizontally arranged above the first inner cavity, and the cover body extends to cover the straight air flow channel.

3. The electronic device according to claim 2, characterized in that, The opening is correspondingly disposed on the second inner cavity.

4. The electronic device according to claim 2, characterized in that, The opening is correspondingly disposed on the straight air flow channel.

5. The electronic device according to claim 1, characterized in that, Both the first inner cavity and the second inner cavity are within the range of the vertical projection of the drainage cavity on the first substrate, and the second inner cavity is sandwiched between the first inner cavity and the drainage cavity.

6. The electronic device according to claim 1, characterized in that, The drainage cavity comprises a transverse drainage channel, and the waterproof net is located on the transverse drainage channel.

7. The electronic device according to claim 1, characterized in that, The distance between the cover body and the top wall of the outer cover is between 0.1 mm and 1 mm.

8. The electronic device according to claim 1, characterized in that, The opening, the first hole and the second hole face the same direction.

9. The electronic device according to claim 1, characterized in that, The first substrate comprises a bottom layer and a top layer, and the through hole is formed on the top layer and communicates with the back cavity.

10. The electronic device according to claim 9, characterized in that, The first inner cavity comprises a transverse air flow channel formed between the bottom layer and the top layer, and the air in the back cavity flows to the straight air flow channel through the transverse air flow channel.

11. The electronic device according to claim 9, characterized in that, The first substrate comprises a plurality of inner support members, located in the first inner cavity and connected to the bottom layer and the top layer.

12. The electronic device according to claim 1, characterized in that, The aperture of each of the first hole and the second hole is greater than 50 microns.

13. An electronic device, characterized in that, Comprising: A first substrate, comprising a first inner cavity and a through hole communicating with the first inner cavity; A second substrate, stacked on the first substrate, and comprising a second inner cavity; A sensor, disposed on the first substrate and covering the through hole, the sensor having a back cavity; A cover body, disposed on the second substrate and covering the second inner cavity; and An outer cover, disposed on the cover body, comprising an outer cover top wall and an outer cover side wall, wherein a transverse drainage channel is formed by spacing between the outer cover top wall and the cover body, and a straight drainage channel is formed by spacing between the outer cover side wall and the second substrate, wherein the transverse drainage channel and the straight drainage channel jointly define a drainage cavity, and the outer cover comprises a first hole and a second hole for communicating the drainage cavity with the outside.

14. The electronic device according to claim 13, characterized in that, The cover body comprises an opening and a waterproof net covering the opening, and the first hole and the second hole are offset from the opening.

15. The electronic device according to claim 13, characterized in that, The first substrate comprises an opening communicating with the first inner cavity and a waterproof net covering the opening.

16. The electronic device according to claim 13, wherein, The first hole and the second hole face the same direction and are jointly correspondingly disposed on the transverse drainage channel.

17. The electronic device according to claim 13, wherein, The first hole and the second hole face different directions and are respectively correspondingly disposed on the transverse drainage channel and the straight drainage channel.

18. The electronic device according to claim 13, wherein, The distance between the cover body and the top wall of the outer cover is between 0.1 millimeter and 1 millimeter.

19. The electronic device according to claim 13, wherein, The second inner cavity and the straight drainage channel are arranged horizontally on the first substrate.

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