CN110995897A

CN110995897A - Electronic device

Info

Publication number: CN110995897A
Application number: CN201911191423.5A
Authority: CN
Inventors: 许明
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2019-11-28
Filing date: 2019-11-28
Publication date: 2020-04-10

Abstract

The application provides an electronic equipment, electronic equipment includes body, card support, button, sensing device, and the card holds in the palm the chuck including apron and fixed connection apron, and the chuck can be dismantled with the body and be connected, and button sliding connection apron just is to the chuck, and sensing device is fixed in the body to the body is connected to the electricity, when the chuck is fixed in the body, the button can receive and press the touch-control power, and triggers sensing device and send the signal of pressing to the body. Because the key is in sliding connection with the cover plate and the key is over against the chuck, the key and the chuck are overlapped in the X-axis direction. Under the certain condition of button and card support size, because button and chuck overlap in X axle direction for button and card hold in the palm the area on the projection to the body along X axle direction is littleer. The body is equipped with the opening, and the opening is pegged graft with the apron, because button and card hold in the palm the area of projection to the body on the X axle direction is littleer for open-ended size can set up littleer, has reduced owing to set up the opening and reduce the degree of body intensity on the body.

Description

Electronic device

Technical Field

The present application relates to the field of electronic technology, and in particular, to an electronic device.

Background

Generally, the fewer the openings of the smart phone, the higher the strength of the smart phone, and the better the waterproof and dustproof performance. However, the current smart phones cannot be provided with holes, because the smart phones still need to be provided with a plurality of holes for arranging keys of the smart phones and the SIM card. In order to reduce the number of holes formed in the smart phone, a key of the smart phone and a SIM card holder are arranged to correspond to one hole of the smart phone. In these schemes, the mobile phone keys and the SIM card holder are often required to be arranged in a staggered manner, and the sizes of the openings corresponding to the mobile phone keys and the SIM card holder are often large.

Disclosure of Invention

The application provides an electronic device, the size of the opening corresponding to a key and a card holder in the electronic device can be set smaller.

The electronic equipment comprises a body, a card support, a key and a sensing device, wherein the card support comprises an cover plate and a fixed connection, the chuck of the cover plate is detachably connected with the body, the key is in sliding connection with the cover plate and right opposite to the chuck, the sensing device is fixed on the body and electrically connected with the body, the chuck is fixed on the body, the key can receive and press touch force and trigger the sensing device to send a pressing signal to the body. Because the key is in sliding connection with the cover plate and the key is over against the chuck, the key and the chuck are overlapped in the X-axis direction. Under the condition that the sizes of the key and the card support are fixed, the key and the card support are overlapped in the X-axis direction, so that the area of the key and the card support projected onto the body along the X-axis direction is smaller. Furthermore, the body is provided with an opening, the opening is connected with the cover plate in an inserting mode, the area of the key and the area of the card support projected onto the body in the X-axis direction is smaller, the size of the opening can be smaller, and the degree of strength reduction of the body due to the fact that the opening is formed in the body is reduced.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an electronic device according to an embodiment of the present application.

Fig. 2 is a schematic perspective view of a card holder and a key of an electronic device according to an embodiment of the present disclosure.

Fig. 3 is an exploded view of fig. 2.

Fig. 4 is an enlarged schematic view, partly in section, of fig. 1 at I.

Fig. 5 is an enlarged schematic view, partially in section, of an electronic device at I according to another embodiment of the present application.

Fig. 6 is an enlarged schematic view, partially in section, of an electronic device at I according to still another embodiment of the present application.

Fig. 7 is an enlarged schematic view, partially in section, of an electronic device at I according to still another embodiment of the present application.

Fig. 8 is an enlarged schematic view, partially in section, of an electronic device at I according to still another embodiment of the present application.

Fig. 9 is a schematic perspective view of a card holder and a key of an electronic device according to still another embodiment of the present disclosure.

Fig. 10 is an enlarged schematic view, partially in section, of an electronic device at I according to still another embodiment of the present application.

Detailed Description

Technical solutions in embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, and not all embodiments. All other embodiments obtained by a person of ordinary skill in the art without any inventive work based on the embodiments in the present application are within the scope of protection of the present application.

Referring to fig. 1 to 4, fig. 1 is a schematic structural diagram of an electronic device according to an embodiment of the present disclosure; fig. 2 is a schematic perspective view of a card holder and a key of an electronic device according to an embodiment of the present disclosure; FIG. 3 is an exploded view of FIG. 2; fig. 4 is an enlarged schematic view, partly in section, of fig. 1 at I.

The electronic device 1 includes, but is not limited to, an electronic device 1 having a key 30 and a card holder 20, such as a smart phone, an internet device (MID), an electronic book, a Portable Player Station (PSP), or a Personal Digital Assistant (PDA). Electronic equipment 1 includes body 10, card support 20, button 30, sensing device 40, card support 20 includes apron 21 and fixed connection the chuck 22 of apron 21, chuck 22 with the connection can be dismantled to body 10, button 30 sliding connection apron 21 is just right chuck 22, sensing device 40 is fixed in body 10, and the electricity is connected body 10 chuck 22 is fixed in during body 10, button 30 can receive and press the touch-control power, and triggers sensing device 40 to body 10 sends the signal of pressing.

Since the key 30 is slidably connected to the cover plate 21, and the key 30 faces the chuck 22, the key 30 and the chuck 22 overlap in the X-axis direction. Under the condition that the sizes of the key 30 and the card holder 20 are fixed, the key 30 and the card holder 20 are overlapped in the X-axis direction, so that the area of the key 30 and the card holder 20 projected on the body 10 along the X-axis direction is smaller. Further, the body 10 is provided with an opening, the opening is inserted into the cover plate 21, and as the area of the key 30 and the area of the card holder 20 projected onto the body 10 along the X-axis direction are smaller, the size of the opening can be set smaller, and the degree of reducing the strength of the body 10 due to the opening on the body 10 is reduced.

Referring to fig. 4 again, in the present embodiment, the body 10 includes a housing 11 and a circuit board 12 fixed to the housing 11, the housing 11 is provided with a slot 111 and an accommodating space 112 communicated with the slot 111, the circuit board 12 is fixed in the accommodating space 112, and the cover plate 21 is inserted into the slot 111. The card holder 20 comprises a cover plate 21 and a chuck 22 fixedly connected with the cover plate 21, and the chuck 22 is detachably connected with the circuit board 12. The cartridge 22 has a card slot for receiving a Subscriber Identity Module (SIM), a Misro SD card, and the like. The card slot is not limited to one or more. Referring to fig. 3 again, the electronic device 1 further includes a card socket 80, the card socket 80 is fixed on the body 10, and when the chuck 22 is fixed on the body 10, the user identification card or the Misro SD card on the chuck 22 is electrically connected to the card socket 80. The keys 30 are not limited to any one or more of a power control key, a volume control key, a photograph control key, etc. When the key 30 receives an external pressing touch force, the key 30 triggers the sensing device 40 to send a pressing signal to the body 10, so as to realize any one or more of power control, volume control, photographing control and the like. The sensing device 40 is not limited to a pressure sensor, an infrared light sensor, a hall element, or the like. The sensing device 40 can be disposed at any position of the body 10, so long as the sensing device 40 can receive the trigger signal of the key 30. The circuit board 12 may be, but is not limited to, a Printed Circuit Board (PCB), a ceramic circuit board, an ultra-thin circuit board, and the like. The circuit board 12 has various functional areas, the functions of which include, but are not limited to, volume control, power control, signal processing, signal transmission, etc.

In the present embodiment, when the chuck 22 is detached from the body 10, the chuck 22 slides from the inside of the receiving space 112 to the outside of the receiving space 112 along the insertion groove 111. When the chuck 22 is fixed to the body 10, the cover plate 21 is fixed to the insertion groove 111. I.e. the dimensions of the cartridge 22 and the keys 30 affect the dimensions of the slot 111. Since the key 30 is slidably connected to the cover plate 21, and the key 30 faces the chuck 22, the key 30 and the chuck 22 overlap in the X-axis direction. Under the condition that the sizes of the key 30 and the card holder 20 are fixed, the key 30 and the chuck 22 are overlapped in the X-axis direction, so that the opening of the slot 111 can be set smaller, and the degree of reducing the strength of the body 10 due to the slot 111 formed in the body 10 is reduced.

Referring to fig. 3, the key 30 is provided with a magnet 31, the sensing device 40 is a hall sensor (the hall sensor and the sensing device 40 have the same reference numeral and are not described in detail below), and the hall sensor 40 is configured to detect a magnetic field signal of the key 30. Compared with the related art, in the embodiment, the touch signal is sent without arranging a contact on the key 30 and directly contacting the contact with the key 30 switch on the circuit board, so that the complexity of the mechanical structure and the circuit structure of the electronic device 1 is reduced. In this embodiment, the hall sensor 40 detects the magnetic field signal of the key 30 to obtain the pressing signal, so that the mechanical structure of the electronic device 1 is simplified, and the hall sensor 40 can accurately detect the magnetic field signal of the key 30, which is beneficial to improving the precision of the hall sensor 40 in detecting the pressing signal.

In the present embodiment, the key 30 is provided with a magnet 31, and the key 30 emits a magnetic field signal. The sensing device 40 detects the magnetic field signal and determines whether the key 30 receives a press according to the strength of the magnetic field signal. Specifically, when the key 30 receives an external pressing touch force, the key 30 approaches in a direction approaching the chuck 22, the sensing device 40 detects that the strength of the magnetic field signal gradually increases, the sensing device 40 converts the detected magnetic field strength into an electric signal, and sends the electric signal to the circuit board 12, so that the functional area of the circuit board 12 determines that the key 30 is pressed by the pressing touch force. When the external pressing touch force is cancelled, the key 30 moves in the direction away from the chuck 22, the intensity of the magnetic field signal detected by the hall sensor 40 is gradually reduced, the detected magnetic field intensity is converted into an electric signal by the hall sensor 40, and the electric signal is sent to the circuit board 12, so that the functional area of the circuit board 12 judges that the pressing touch force for pressing the key 30 is cancelled. When the key 30 is a power control key 30, the electrical signal generated by pressing the key 30 with the pressing touch force is transmitted to the functional area on the circuit board 12 for controlling the power, and the signal generated by canceling the pressing touch force is transmitted to the functional area on the circuit board 12 for controlling the power, so that the electronic device 1 can be switched from the on-screen state to the off-screen state.

Further, referring to fig. 2 and 4 again, the magnet 31 is disposed on a side of the key 30 facing the chuck 22, and the hall sensor 40 is fixed to the body 10 adjacent to the chuck 22. The smaller the distance between the magnet 31 and the hall sensor 40 is, the higher the accuracy of the hall sensor 40 detecting the magnetic field signal of the magnet 31 is. When the chuck 22 is fixed to the body 10, since the magnet 31 is disposed on the side of the key 30 facing the chuck 22, the distance between the magnet 31 and the body 10 is shortened, and the hall sensor 40 is fixed to the position of the body 10 adjacent to the chuck 22, the distance between the magnet 31 and the hall sensor 40 is shortened, and the accuracy of the magnetic field signal of the magnet 31 detected by the hall sensor 40 is improved. In the present embodiment, the hall sensor 40 is fixed on the circuit board 12, and the hall sensor 40 is fixed on a side of the circuit board 12 away from the card seat. The electronic device 1 further comprises a flexible circuit board, wherein the flexible circuit board is connected between the hall sensor 40 and the circuit board 12, so that the hall sensor 40 is electrically connected with the circuit board 12.

Referring to fig. 4 again, the cover plate 21 has a sliding slot 211, the key 30 is partially received in the sliding slot 211, and the magnet 31 is disposed on the key 30 received in the sliding slot 211. Because the key 30 is partially received in the sliding groove 211, the inner wall of the sliding groove 211 defines the sliding direction of the key 30, so that the key 30 can only slide along the inner wall of the sliding groove 211 toward the chuck 22 or slide away from the chuck 22. The magnet 31 is disposed on the portion of the key 30 received in the sliding slot 211, so that the magnet 31 is closer to the circuit board 12 and the hall sensor 40 fixed on the circuit board 12, and the accuracy of detecting the magnetic field signal of the magnet 31 by the hall sensor 40 is improved.

Referring to fig. 2 to 4 again, the portion of the key 30 exposed outside the sliding slot 211 is provided with a fastening portion 33, and the fastening portion 33 is used for receiving a pulling force to drive the card holder 20. Since the key 30 is provided with the locking portion 33, the card holder 20 can be detached from the body 10 by applying a pulling force to the locking portion 33, and the card holder 20 can be mounted on the body 10 by applying a pushing force to the locking portion 33, so that convenience in mounting and detaching the card holder 20 is improved. When the card holder 20 is fixed on the circuit board 12, a pulling force can be applied to the fastening portion 33, and the fastening portion 33 slides in a direction away from the chuck 22 under the action of the pulling force and drives the card holder 20 to slide out along the sliding groove 211. When the card holder 20 is mounted on the circuit board 12, the card 22 is slid into the receiving space 112, and the cover plate 21 slides into the receiving space 112 along the sliding groove 211. Pushing force is applied to the fastening portion 33, so that the fastening portion 33 moves in a direction approaching to the chuck 22 under the action of the pushing force, and the chuck 22 is driven to be fixed on the circuit board 12. It is to be understood that the catching portion 33 is not limited to a groove, a protrusion, etc. provided on a portion of the key 30 exposed outside the sliding groove 211. The number of the deduction portions 33 is not limited to one or more. Compared with the scheme that the card support buckle is taken out of the circuit board through the contact pin in the prior art, the card support 20 can be taken out only by applying pull-out force to the buckling part 33, and the convenience of disassembling the card support 20 is improved; further, in the present embodiment, it is not necessary to provide an opening for accommodating a pin on the card holder 20, so that the card holder 20 can be smaller; further, in this embodiment, it is not necessary to provide a rotating device inside the card holder 20 for matching with the pin, and the rotating device is used to convert the pushing force of the pin into an acting force for pushing the card holder 20 to separate from the circuit board, so that the structure of the card holder 20 in this embodiment is simpler, and the card holder 20 can be made smaller.

Further, referring to fig. 5, fig. 5 is an enlarged schematic view of a partial cross-section of an electronic device at I according to another embodiment of the present application. This embodiment may be combined with the electronic device 1 provided in any of the above-described embodiments, in this embodiment, the key 30 extends through a portion of the cover plate 21 toward the chuck 22 to form a supporting column 32, and the magnet 31 is fixed to an end of the supporting column 32 away from the cover plate 21. The magnet 31 is fixed to the support column 32, and the support column 32 extends toward the chuck 22 so that the magnet 31 is closer to the chuck 22. When the chuck 22 is fixed to the body 10, the magnet 31 is closer to the hall sensor 40, so that the accuracy of detecting the magnetic field signal of the magnet 31 by the hall sensor 40 is improved. It is to be understood that the way of fixing the magnet 31 to the support post 32 is not limited to the fixing way of welding, bonding, fastening, etc. to fix the connection. In this embodiment, the supporting pillar 32 extends toward the chuck 22, and a gap is formed between the supporting pillar 32 and the chuck 22 to prevent the supporting pillar 32 from abutting against the chuck 22.

Referring to fig. 6, fig. 6 is an enlarged schematic view, partially in section, of an electronic device according to another embodiment of the present application. In this embodiment, in combination with the electronic device 1 provided in any of the above-described embodiments, in this embodiment, the chuck 22 is provided with a limiting groove 220, the key 30 is provided with a limiting portion 34, the limiting portion 34 is accommodated in the limiting groove 220, the electronic device 1 further includes a limiting member 70, the limiting member 70 is fixed on a sidewall 221 of the limiting groove 220, and the limiting member 70 is used for limiting a sliding distance of the limiting portion 34 with respect to the body 10. In this embodiment, the stopper groove 220 is connected to the slide groove 211, and the stopper 70 is fixed to the side wall 221 of the stopper groove 220 by a fixing method not limited to welding, bonding, or fastening. The stopper 70 is not limited to a pin, a key, or the like. The limiting member 70 is fixed on the sidewall 221 of the limiting groove 220, the limiting portion 34 of the key 30 is accommodated in the limiting groove 220, and the limiting portion 34 can slide in the limiting groove 220. When the key 30 slides to a predetermined distance along a direction away from the chuck 22, the limiting part 34 abuts against the limiting part 70, so as to prevent the key 30 from separating from the holder 20.

Referring to fig. 7, fig. 7 is an enlarged schematic view, partially in section, of an electronic device according to another embodiment of the present application. The present embodiment may be combined with the electronic device 1 provided in any of the foregoing embodiments, in the present embodiment, an accommodating portion 2211 is further provided on the sidewall 221 of the limiting groove 220, the accommodating portion 2211 is used for accommodating the limiting member 70, the limiting member 70 is fixed to the accommodating portion 2211, the limiting member 70 at least partially exposes out of the accommodating portion 2211, and the portion of the limiting member 70 that exposes out of the accommodating portion 2211 is used for limiting the sliding distance of the limiting portion 34 relative to the main body 10.

In the present embodiment, the position-limiting portion 34 includes a first position-limiting portion 34a and a second position-limiting portion 34b, the supporting pillar 32 is fixed between the first position-limiting portion 34a and the second position-limiting portion 34b, and the position-limiting member 70 includes a first position-limiting member (no mark in the drawing) and a second position-limiting member (no mark in the drawing), the first position-limiting member is configured to limit a sliding distance of the first position-limiting portion 34a relative to the body 10, and the second position-limiting member is configured to limit a sliding distance of the second position-limiting portion 34b relative to the body 10. Specifically, the first position-limiting portion 34a and the second position-limiting portion 34b are symmetrical with respect to the supporting column 32, so that the sliding distances of the first position-limiting portion 34a and the second position-limiting portion 34b relative to the body 10 are kept consistent.

In this embodiment, the limiting groove 220 is further provided with a bottom wall 222 connected to the side wall 221, the electronic device 1 further includes an elastic member 60, the elastic member 60 is fixed between the limiting portion 34 and the bottom wall 222, and the elastic member 60 is configured to provide a restoring force to the key 30 away from the chuck 22.

The elastic member 60 has a first end 61 and a second end 62 opposite to the first end 61, the first end 61 is fixed on the position-limiting portion 34, the second end 62 abuts against the bottom wall 222, and the elastic member 60 is used for providing a restoring force for the key 30 away from the chuck 22. The elastic member 60 is not limited to a spring, a steel sheet having elasticity, a plastic having elasticity, or the like. When the external pressing touch force is removed, the elastic member 60 can provide a restoring force to the key 30 away from the chuck 22, and the restoring force can make the key 30 slide away from the chuck 22.

Referring to fig. 8, fig. 8 is an enlarged schematic view, partially in section, of an electronic device at position I according to another embodiment of the present application. The elastic member 60 is fixed to the cover plate 21 and the bottom wall 222 of the sliding chute 211. The supporting column 32 includes a first sub-supporting column (no mark in the drawing) and a second sub-supporting column (no mark in the drawing) opposite to the first sub-supporting column, the magnet 31 includes a first sub-magnet 31a and a second sub-magnet 31b, the first sub-magnet 31a is fixed on the first sub-supporting column 32, the second sub-magnet 31b is fixed on the second sub-supporting column 32, the hall sensor 40 includes a first sub-hall sensor (no mark in the drawing) and a second sub-hall sensor (no mark in the drawing), the first sub-hall sensor is used for detecting a magnetic field signal sent by the first sub-magnet 31a, and the second sub-hall sensor is used for detecting a magnetic field signal sent by the second sub-magnet 31 b. The key 30 is a volume control key, the first sub hall sensor is electrically connected to the volume increasing functional region on the circuit board 12, and the second sub hall sensor is electrically connected to the volume decreasing functional region on the circuit board 12. When the external press touch force presses the key 30 and drives the first sub-supporting post 32 and the first sub-magnet 31a to slide close to the chuck 22, the first sub-hall sensor detects that the magnetic field signal of the first sub-magnet 31a is gradually increased, the first sub-hall sensor sends an electric signal to the function area for increasing the volume, and the output volume of the output device of the electronic device 1 is increased. When the external press touch force presses the key 30 and drives the second sub-supporting post 32 and the second sub-magnet 31b to slide close to the chuck 22, the second sub-hall sensor detects that the magnetic field signal of the second sub-magnet 31b is gradually increased, the second sub-hall sensor sends an electric signal to the volume-reducing functional area, and the output volume of the output device of the electronic device 1 is reduced. It will be appreciated that the first support column 32 and the second support column 32 are symmetrical about the centerline II of the key 30. In the present embodiment, the elastic member 60 is fixed between the bottom wall of the sliding groove 211 and the key 30, and since the elastic member 60 can provide a restoring force to the key 30 away from the chuck 22, the restoring force can make the key 30 slide away from the chuck 22. The elastic member 60 has elasticity, and the elastic member 60 is further configured to buffer the pressing touch force received by the key 30.

Referring to fig. 9, fig. 9 is a schematic perspective view of a card holder and a key of an electronic device according to another embodiment of the present application; fig. 10 is an enlarged schematic view, partially in section, of an electronic device at I according to still another embodiment of the present application. This embodiment may be combined with the electronic device 1 according to any of the above-described embodiments, in which the electronic device 1 further includes a sealing member 50, and the sealing member 50 is hermetically connected between the chuck 22 and the cover plate 21. Because the sealing element 50 is arranged between the key 30 and the cover plate 21, the sealing element 50 seals the gap between the chuck 22 and the cover plate 21, so that external liquid and dust cannot flow into the body 10 from the gap between the chuck 22 and the cover plate 21, and the waterproof and dustproof performances of the electronic device 1 are improved. Specifically, the card holder 20 further includes a connecting portion 23 connected between the cover plate 21 and the chuck 22, and the sealing member 50 encloses the connecting portion 23. When the cover plate 21 is inserted into the slot 111, the cover plate 21 fills the slot 111, and the sealing member 50 encloses the connecting portion 23, so that external liquid and dust cannot flow into the body 10 from a gap between the cover plate 21 and the slot 111 through the connecting portion 23, thereby improving the waterproof and dustproof performances of the electronic device 1.

The foregoing detailed description of the embodiments of the present application has been presented to illustrate the principles and implementations of the present application, and the above description of the embodiments is only provided to help understand the method and the core concept of the present application; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.

Claims

1. The utility model provides an electronic equipment, its characterized in that, electronic equipment includes body, card support, button, sensing device, the card holds in the palm including apron and fixed connection the chuck of apron, the chuck with the connection can be dismantled to the body, button sliding connection the apron is just right the chuck, sensing device is fixed in the body to the electricity is connected the body the chuck is fixed in during the body, the button can receive and press touch-control power, and trigger sensing device to the body sends and presses the signal.

2. The electronic device of claim 1, wherein the key is provided with a magnet, and the sensing device is a hall sensor for detecting a magnetic field signal of the key.

3. The electronic device of claim 2, wherein the magnet is disposed on a side of the key facing the chuck, and the hall sensor is fixed to the body adjacent to the chuck.

4. The electronic device of claim 3, wherein the cover plate has a slot, the key portion is received in the slot, and the magnet is disposed on a portion of the key received in the slot.

5. The electronic device of claim 4, wherein a support post extends through a portion of the cover plate toward the chuck, and the magnet is secured to an end of the support post remote from the cover plate.

6. The electronic device of claim 4, wherein the portion of the key exposed outside the sliding slot is provided with a buckling portion for receiving a pulling force to drive the card holder.

7. The electronic device according to claim 4, wherein the chuck has a limiting groove, the key has a limiting portion, and the limiting portion is received in the limiting groove, and the electronic device further comprises a limiting member fixed to a sidewall of the limiting groove, and the limiting member is used to limit a sliding distance of the limiting portion relative to the body.

8. The electronic device of claim 7, wherein the position-limiting groove further has a bottom wall connected to the side wall, and the electronic device further comprises an elastic member fixed between the position-limiting portion and the bottom wall, the elastic member being configured to provide a restoring force to the key away from the chuck.

9. The electronic device of claim 8, further comprising a seal sealingly connected between the chuck and the cover plate.

10. The electronic device of claim 1, wherein the body comprises a housing and a circuit board fixed to the housing, the housing is provided with a slot and the accommodating space communicated with the slot, the circuit board is fixed in the accommodating space, and the cover plate is inserted into the slot.