Electronic device

Abstract

The invention relates to an electronic device which comprises a substrate, a sensor, an inner cover, a waterproof net and an outer cover. The sensor is arranged on the substrate. The inner cover is arranged on the substrate, covers the sensor and comprises an opening. The waterproof net is arranged on the inner cover and covers the opening. The outer cover is arranged on the substrate and covers the inner cover, so that the drainage cavity is formed between the inner cover and the outer cover. The drainage cavity is communicated with the outside through the first hole and the second hole. The first hole and the second hole are staggered at the opening. The portion, between the first hole and the second hole, of the drainage cavity serves as a drainage channel, and the length of the drainage channel is larger than the aperture of the opening.

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 sensor) usually has an opening to communicate the air inside the chamber and the outside. In addition, a waterproof net is disposed on the opening to prevent dust or water droplets from entering the chamber 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 enters the chamber through the opening, thereby affecting the operation of the electronic device. How to avoid the water flow from entering the chamber is one of the research goals of researchers in this field. Summary of the Invention

[0003] This application provides an electronic device, and its outer cover can reduce the probability of external water flow entering the chamber.

[0004] The electronic device of this application includes a substrate, a sensor, an inner cover, a waterproof net, and an outer cover. The sensor is disposed on the substrate. The inner cover is disposed on the substrate and covers the sensor, and includes an opening. The waterproof net is disposed on the inner cover and covers the opening. The outer cover is disposed on the substrate and covers the inner cover, so that a drainage cavity is formed between the inner cover and the outer cover. The drainage cavity communicates with the outside through a first hole and a second hole. The first hole and the second hole are offset from the opening. The portion of the drainage cavity between the first hole and the second hole serves as a drainage channel, and the length of the drainage channel is greater than the aperture of the opening.

[0005] In an embodiment of this application, the above-mentioned opening, first hole, and second hole face the same direction.

[0006] In an embodiment of this application, the above-mentioned first hole and second hole face different directions.

[0007] In an embodiment of this application, the above-mentioned substrate has a through hole, and the through hole communicates the drainage cavity with the outside.

[0008] In an embodiment of this application, the above-mentioned inner cover includes an inner cover top wall, the outer cover includes an outer cover top wall close to the inner cover top wall, and the distance between the inner cover top wall and the outer cover top wall is between 0.1 mm and 1 mm.

[0009] In an embodiment of this application, the above-mentioned opening is formed on the inner cover top wall of the inner cover, the outer cover includes an outer cover top wall close to the inner cover top wall, and the first hole and the second hole are formed on the outer cover top wall.

[0010] In an embodiment of this application, the above-mentioned opening is formed on the inner cover top wall of the inner cover, the first hole is formed on the outer cover top wall of the outer cover, and the second hole is formed on the outer cover side wall of the outer cover.

[0011] In one embodiment of the present application, the opening is formed on the inner cover top wall of the inner cover, the first hole is formed on the outer cover top wall of the outer cover, and the second hole is formed on the base plate.

[0012] In one embodiment of the present application, the substrate includes a top layer, a through hole located in the top layer, a bottom layer, and an internal chamber located between the top layer and the bottom layer.

[0013] In one embodiment of the present application, the substrate includes a plurality of inner support members, which are located in the inner chamber and connected to the top layer and the bottom layer.

[0014] In one embodiment of the present application, the sensor has a back cavity, and the back cavity is connected to the internal chamber through a through hole.

[0015] In one embodiment of the present application, the substrate further comprises a plurality of electrode layers, and the plurality of electrode layers are located on the substrate and are configured on the other side of the outer cover.

[0016] In one embodiment of the present application, the diameter of each of the first hole and the second hole is greater than 50 micrometers.

[0017] In one embodiment of the present application, the waterproof net is located on the drainage channel.

[0018] In an embodiment of the present application, the drainage channel has at least one turn.

[0019] Based on the above, the outer cover of the electronic device of the present application covers the inner cover, and the outer cover has a first hole and a second hole. The first hole and the second hole are arranged staggered with the opening of the inner cover. 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, thereby reducing the probability of the high-pressure water flow entering the chamber through the opening. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a cross-sectional schematic diagram of an electronic device according to the first embodiment of the present application.

[0021] Figure 2 It is a cross-sectional schematic diagram of an electronic device according to the second embodiment of the present application.

[0022] Figure 3 It is a cross-sectional schematic diagram of an electronic device according to the third embodiment of the present application.

[0023] Figure 4 It is a cross-sectional schematic diagram of an electronic device according to the fourth embodiment of the present application.

[0024] Figure 5 It is a cross-sectional schematic diagram of an electronic device according to the fifth embodiment of the present application.

[0025] Description of the reference numerals in the attached drawings:

[0026] 100, 100a, 100b, 100c, 100d: Electronic devices;

[0027] 110, 110b, 110c, 110d: Substrates;

[0028] 111b: Through hole;

[0029] 112c, 112d: Top layer;

[0030] 113c, 113d: Via hole;

[0031] 114c, 114d: Bottom layer;

[0032] 115c, 115d: Internal chamber;

[0033] 116c, 116d: Inner support;

[0034] 117: Internal circuit layer;

[0035] 118: Electrode layer;

[0036] 120, 120c, 120d: Sensors;

[0037] 122: Membrane;

[0038] 124c, 124d: Rear cavity;

[0039] 130: Inner cover;

[0040] 132: Opening;

[0041] 134: Top wall of the inner cover;

[0042] 136: Side wall of the inner cover;

[0043] 140: Waterproof net;

[0044] 150, 150a, 150b: Outer covers;

[0045] 152: Top wall of the outer cover;

[0046] 154: Side wall of the outer cover;

[0047] 156: First hole;

[0048] 158, 158a, 158b: Second holes;

[0049] 160: Control chip;

[0050] C1: Chamber;

[0051] C2: Drainage chamber;

[0052] d, d1, d2: aperture diameter;

[0053] L1, L2: length;

[0054] P, P1, P2: drainage channels. Detailed implementation manners

[0055] Figure 1 The cross-sectional schematic diagram of an electronic device according to the first embodiment of the present application is shown. Please refer to Figure 1 , the electronic device 100 of this embodiment is, for example, a microphone or a pressure sensor device, but the present application does not limit the type of the electronic device 100.

[0056] The electronic device 100 of this embodiment includes a substrate 110, a sensor 120, an inner cover 130, and a waterproof net 140. The sensor 120 is disposed on the substrate 110. The inner cover 130 is disposed on the substrate 110 and covers the sensor 120. The inner cover 130 includes an opening 132, and the opening 132 is disposed on the top wall 134 of the inner cover of the inner cover 130. The waterproof net 140 is disposed on the top wall 134 of the inner cover of the inner cover 130 and covers the opening 132.

[0057] Specifically, the sensor 120 is located in the chamber C1 formed between the substrate 110 and the inner cover 130, and the opening 132 communicates with the chamber C1. The waterproof net 140 can prevent external water flow or dust from entering the chamber C1, so as to avoid damage caused by moisture of the internal components in the chamber C1.

[0058] In this embodiment, the sensor 120 includes, for example, a MEMS chip, and the MEMS chip can be applied to a microphone, a bone conduction vibration sensor, a barometer, etc., but the type of the sensor 120 is not limited thereto. The sensor 120 includes a diaphragm 122, and the sensor 120 can convert the deformation generated by the diaphragm 122 into an electrical signal.

[0059] In addition, a control chip 160 is disposed on the substrate 110 and is located in the chamber C1. The control chip 160 is electrically connected to the sensor 120 and the substrate 110. Specifically, the sensor 120 is connected to the control chip 160 by wire bonding, for example, and the control chip 160 is connected to the internal circuit layer 117 of the substrate 110 by wire bonding, for example. The control chip 160 is, for example, an ASIC chip, but the present application is not limited thereto.

[0060] The electronic device 100 of this embodiment includes an outer cover 150 disposed on a substrate 110 and covering an inner cover 130, so that a drainage cavity C2 is formed between the inner cover 130 and the outer cover 150. The drainage cavity C2 communicates with the outside through a first hole 156 and a second hole 158. In addition, the part of the drainage cavity C2 between the first hole 156 and the second hole 158 serves as a drainage channel P, and a waterproof net 140 is located on the drainage channel P.

[0061] Specifically, the outer cover 150 includes an outer cover top wall 152 close to the top wall 134 of the inner cover, and the first hole 156 and the second hole 158 of this embodiment are formed in the outer cover top wall 152. In other embodiments, the first hole 156 and the second hole 158 may also be formed in the outer cover side wall 154. This application does not limit the first hole 156 and the second hole 158 to be provided on the outer cover top wall 152 or the outer cover side wall 154.

[0062] As Figure 1 shown, when water flow impacts the outer cover 150, the first hole 156 serves as an inlet hole, for example, and the second hole 158 serves as a drainage hole, for example. The water flow is adapted to enter through the inlet hole (for example, the first hole 156) and flow along the drainage channel P, and then the water flow is discharged to the outside from the drainage hole (for example, the second hole 158). Of course, the first hole 156 and the second hole 158 may also be a drainage hole and an inlet hole respectively to drain the water flow entering the drainage channel P.

[0063] In this embodiment, the first hole 156 and the second hole 158 are staggered from the opening 132 of the inner cover 130. Specifically, when relatively high-pressure water flow impacts the outer cover 150, since the first hole 156 and the second hole 158 are staggered from the opening 132, the waterproof net 140 is not directly impacted by the external high-pressure water flow, and the probability of the external high-pressure water flow entering the interior of the chamber C1 through the opening 132 can be reduced.

[0064] In addition, the double-hole design of the outer cover 150 of this embodiment with an inlet hole and a drainage hole (that is, the first hole 156 and the second hole 158) can release the dynamic water pressure of the water flow, and can also keep the air pressure in the drainage cavity C2 balanced, so that the water flow can be smoothly discharged to the outside from the drainage hole.

[0065] The outer cover 150 of this embodiment defines a flow path of the drainage channel P between the vertical projection of the first hole 156 onto the drainage cavity C2 and the vertical projection of the second hole 158 onto the drainage cavity C2. Among them, the length L1 of the flow path of the drainage channel P is greater than the aperture d of the opening 132. The length L1 of the drainage channel P is greater than or equal to more than half of the length L2 of the inner cover 130, and the length L1 of the drainage channel P is greater than 0.2 times of the length L2 of the inner cover 130. In addition, there is a spacing between the top wall 134 of the inner cover and the top wall 152 of the outer cover, which is between 0.1 mm and 1 mm. Through the above design, a certain flow path can be ensured. When high-pressure water flow enters the drainage cavity C2, the dynamic water pressure is released to a certain extent to prevent the waterproof net 140 from being damaged due to excessive water flow pressure in the drainage cavity C2.

[0066] The substrate 110 of this embodiment further includes a plurality of electrode layers 118, and the plurality of electrode layers 118 are located on the substrate 110 and are arranged on the other side relative to the outer cover 150. The electronic device 100 of this embodiment can be electrically connected to and arranged on other devices (such as a vehicle body) through the electrode layers 118. In addition, the electronic device 100 is adapted to be arranged on other devices in a flip-chip manner (that is, Figure 1 in an upside-down state) through the electrode layers 118. At this time, the first hole 156 and the second hole 158 are located at the lower part of the overall electronic device 100. Such an arrangement can make the water flow in the drainage cavity C2 move downward due to gravity, so that the water flow can be quickly discharged to the outside from the first hole 156 or the second hole 158 below.

[0067] It is worth mentioning that the opening 132, the first hole 156 and the second hole 158 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 chamber C1 smoothly from the first hole 156, the second hole 158 and the opening 132. In other embodiments, the opening 132, the first hole 156 and the second hole 158 can also face different directions, and the present application is not limited thereto.

[0068] In addition, the aperture d1 of the first hole 156 and the aperture d2 of the second hole 158 are both greater than 50 microns to ensure that the acoustic characteristics of the sound are not affected when the sound enters the chamber C1 from the first hole 156, the second hole 158 and the opening 132. Specifically, the aperture d1 of the first hole 156 and the aperture d2 of the second hole 158 are both greater than 50 microns, which can effectively avoid 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's usage experience.

[0069] It should be noted that the present application does not limit the number of holes provided on the outer cover 150, as long as it is ensured that the number of holes provided on the outer cover 150 is greater than two, so that water can flow in and out of the drainage cavity C2 smoothly, and all the holes are staggered from the opening 132. However, when the number of holes provided on the outer cover 150 increases, the amount of dust entering the drainage cavity C2 will also increase accordingly. Therefore, the number of holes on the outer cover 150 should not be too many. In addition, the materials of the inner cover 130 and the outer cover 150 in this embodiment are both metal materials, so that external electromagnetic interference can be further prevented.

[0070] In addition, in other embodiments, the opening 132 and the waterproof net 140 can also be provided on the inner cover side wall 136 of the inner cover 130, so that the waterproof net 140 is not located on the drainage channel P. The present application is not limited thereto.

[0071] Figure 2 The cross-sectional schematic diagram of an electronic device according to the second embodiment of the present application is shown. Please refer to Figure 2 , the main difference between the electronic device 100a in this embodiment and Figure 1 the electronic device 100 is that, in this embodiment, the first hole 156 and the second hole 158a face different directions.

[0072] Specifically, the opening 132 in this embodiment is formed on the inner cover top wall 134 of the inner cover 130, the first hole 156 is formed on the outer cover top wall 152 of the outer cover 150a, and the second hole 158a is formed on the outer cover side wall 154 of the outer cover 150a. Since the first hole 156 and the second hole 158a are respectively located on the outer cover top wall 152 and the outer cover side wall 154 and face different directions, the drainage channel P1 has a turn, and the dynamic water pressure of the high-pressure water flow entering the drainage cavity C2 can be further released, so as to avoid damage to the waterproof net 140 due to excessive water flow pressure in the drainage cavity C2, and further reduce the probability of water flow passing through the waterproof net 140 and entering the interior of the chamber C1.

[0073] In addition, the electronic device in this embodiment is suitable for being arranged on other devices in a right-side-up manner (i.e., Figure 2 the state). At this time, the first hole 156 is located at a high position of the overall electronic device 100a, and the second hole 158a is located at a low position of the overall electronic device 100a. In such a setting manner, when water flows into the drainage cavity C2 from the upper first hole 156, the water flow is affected by gravity and moves downward along the drainage channel P1, so that the water flow can be quickly discharged to the outside from the lower second hole 158a.

[0074] Figure 3 The cross-sectional schematic diagram of an electronic device according to the third embodiment of the present application is shown. Please refer to Figure 3 , the electronic device 100b in this embodiment and Figure 2The main difference of the electronic device 100a is that, in this embodiment, the substrate 110b has a through hole 111b, and the through hole 111b communicates the drainage cavity C2 with the outside.

[0075] Specifically, the opening 132 of this embodiment is formed on the inner cover top wall 134 of the inner cover 130, and the first hole 156 is formed on the outer cover top wall 152 of the outer cover 150b. The second hole 158b is formed on the substrate 110b, and the second hole 158b is connected to the through hole 111b.

[0076] The electronic device 100b of this embodiment is adapted to be disposed on other devices in a right-side-up manner (i.e., Figure 3 in the state). At this time, the first hole 156 is located at a high position of the overall electronic device 100b, and the second hole 158b is located at a low position of the overall electronic device 100b. In such a setting manner, when water flows into the drainage cavity C2 from the relatively upper first hole 156, the water is affected by gravity and moves downward along the drainage channel P2, so that the water can be quickly discharged to the outside from the relatively lower second hole 158b and the through hole 111b.

[0077] Figure 4 The cross-sectional schematic diagram of an electronic device according to the fourth embodiment of the present application is shown. Please refer to Figure 4 , the main difference between the electronic device 100c of this embodiment and the Figure 1 electronic device 100 is that, in this embodiment, the substrate 110c has an internal cavity 115c.

[0078] Specifically, the substrate 110c includes a top layer 112c, a through hole 113c located on the top layer 112c, a bottom layer 114c, and an internal cavity 115c located between the top layer 112c and the bottom layer 114c. The top layer 112c bears the sensor 120c, the inner cover 130, and the control chip 160, and the internal circuit layer 117 is disposed on the top layer 112c. The electrode layer 118 is disposed on the bottom layer 114c and is configured on the other side relative to the internal cavity 115c.

[0079] The sensor 120c has a back cavity 124c, and the back cavity 124c communicates with the internal cavity 115c through the through hole 113c. By providing the internal cavity 115c on the substrate 110c and connecting the back cavity 124c to the internal cavity 115c, the internal cavity 115c serves as a part of the back cavity 124c of the sensor 120c, so that the sensor 120c has a larger back cavity space (i.e., Figure 4 the back cavity 124c and the internal cavity 115c). Thus, the volume of the back cavity of the sensor 120c is increased, effectively improving the performance of the acoustic signal-to-noise ratio.

[0080] The substrate 110c of this embodiment includes a plurality of inner supports 116c (shown as two), and the plurality of inner supports 116c are located in the internal chamber 115c and connected to the top layer 112c and the bottom layer 114c. The inner supports 116c can strengthen the overall rigidity of the substrate 110c.

[0081] In addition, similar to Figure 1 the electronic device 100, the first hole 156 and the second hole 158 of this embodiment are offset from the opening 132. External water flow can enter and exit the drainage chamber C2 through the first hole 156 and the second hole 158, and the waterproof net 140 will not be directly impacted by the external high-pressure water flow, thereby reducing the probability of water flow entering the interior of the chamber C1 through the opening 132.

[0082] Figure 5 A cross-sectional schematic diagram of an electronic device according to a fifth embodiment of the present application is shown. Please refer to Figure 5 , the main difference between the electronic device 100d of this embodiment and Figure 2 the electronic device 100a is that, in this embodiment, the substrate 110d has an internal chamber 115d communicating with the chamber C1.

[0083] Specifically, the structural configurations of the top layer 112d, the through hole 113d, the bottom layer 114d, the internal chamber 115d, the plurality of inner supports 116d, and the back cavity 124d of the sensor 120d of this embodiment are the same as those of the top layer 112c, the through hole 113c, the bottom layer 114c, the internal chamber 115c, the plurality of inner supports 116c, and the back cavity 124c of the sensor 120c of Figure 4 . That is to say, the sensor 120d of this embodiment can also effectively improve the performance of the acoustic signal-to-noise ratio. In addition, the inner supports 116d can also strengthen the overall rigidity of the substrate 110d.

[0084] In addition, similar to Figure 2 the electronic device 100a, the first hole 156 and the second hole 158a of this embodiment are offset from the opening 132. External water flow can enter and exit the drainage chamber C2 through the first hole 156 and the second hole 158a, and the waterproof net 140 will not be directly impacted by the external high-pressure water flow, thereby reducing the probability of water flow entering the interior of the chamber C1 through the opening 132.

[0085] In summary, the outer cover of the electronic device of the present application covers the opening of the inner cover, and the outer cover has a first hole and a second hole. The first hole and the second hole are offset from the opening. Thus, when a relatively high-pressure water flow impacts the outer cover, the waterproof net will not be directly impacted by the external high-pressure water flow, thereby reducing the probability of high-pressure water flow entering the interior of the chamber through the opening.

[0086] In addition, the electronic device of the present application is connected to the back cavity of the sensor through the internal cavity formed by the top layer and the bottom layer, so that the internal cavity serves as a part of the cavity of the sensor, and the sensor has a larger cavity. In this way, the sensor can effectively improve the performance of the acoustic signal-to-noise ratio.

[0087] The above-described embodiments merely represent several implementation manners of the present application, and the description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. An electronic device, characterized in that, Comprising: A substrate; A sensor, disposed on the substrate; An inner cover, disposed on the substrate and covering the sensor, and including an opening; A waterproof net, disposed on the inner cover and covering the opening; And An outer cover, disposed on the substrate and covering the inner cover, such that a drainage cavity is formed between the inner cover and the outer cover, the drainage cavity communicates with the outside through a first hole and a second hole, the first hole and the second hole are offset from the opening, a portion of the drainage cavity between the first hole and the second hole serves as a drainage channel, and the length of the drainage channel is greater than the aperture of the opening.

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

3. The electronic device according to claim 1, characterized in that, The first hole and the second hole face different directions.

4. The electronic device according to claim 3, characterized in that, The substrate has a through hole, and the through hole communicates the drainage cavity with the outside.

5. The electronic device according to claim 1, characterized in that, The inner cover includes an inner cover top wall, the outer cover includes an outer cover top wall close to the inner cover top wall, and the distance between the inner cover top wall and the outer cover top wall is between 0.1 mm and 1 mm.

6. The electronic device according to claim 1, characterized in that, The opening is formed in the inner cover top wall of the inner cover, the outer cover includes an outer cover top wall close to the inner cover top wall, and the first hole and the second hole are formed in the outer cover top wall.

7. The electronic device according to claim 1, characterized in that, The opening is formed in the inner cover top wall of the inner cover, the first hole is formed in the outer cover top wall of the outer cover, and the second hole is formed in the outer cover side wall of the outer cover.

8. The electronic device according to claim 1, characterized in that, The opening is formed in the inner cover top wall of the inner cover, the first hole is formed in the outer cover top wall of the outer cover, and the second hole is formed in the substrate.

9. The electronic device according to claim 1, characterized in that, The substrate includes a top layer, a through hole located in the top layer, a bottom layer, and an internal cavity located between the top layer and the bottom layer.

10. The electronic device according to claim 9, characterized in that, The substrate includes a plurality of inner supports, and the plurality of inner supports are located in the internal cavity and connected to the top layer and the bottom layer.

11. The electronic device according to claim 9, characterized in that, The sensor has a back cavity, and the back cavity communicates with the internal cavity through the through hole.

12. The electronic device according to claim 1, characterized in that, The substrate further includes a plurality of electrode layers, and the plurality of electrode layers are located on the substrate and disposed on the other side relative to the outer cover.

13. 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.

14. The electronic device according to claim 1, characterized in that, The waterproof net is located on the drainage channel.

15. The electronic device according to claim 1, characterized in that, The drainage channel has at least one turn.

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