Key switch capable of preventing electromagnetic interference

Abstract

The utility model relates to an anti-electromagnetic interference key switch, which mainly comprises a top shell, an outer cover shell, a key, a circuit board and the like, an electromagnetic shielding cap is arranged between the top shell and the key, an electromagnetic shielding layer is arranged on the inner wall of the outer cover shell, and a display lamp is connected with the circuit board through a gap between the top shell and the key. A micro-motion assembly is arranged at the bottom of the key, a micro-motion assembly is arranged at the top of the base, a reset spring is arranged between the key and the base, and the circuit board is arranged in the base. A micro-motion assembly is arranged at the bottom of the key, and the microcontroller is arranged in the elastic shell in a sleeved mode. The electromagnetic shielding cap and the electromagnetic shielding layer are formed by a multi-layer composite structure and comprise a conductive rubber layer, a metal woven mesh layer and a nano graphite coating, multiple shielding protection is provided, the top shell is made of polycarbonate materials, the influence of electromagnetic interference on the display lamp and the microcontroller is avoided, and normal operation of the key switch is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of key switch, more specifically, it relates to a key switch of preventing electromagnetic interference. BACKGROUND

[0002] At present, in modern electronic equipment, key switch as common human-computer interaction component is widely used in various electronic products, such as mobile phone, computer, household appliance and industrial control equipment etc.

[0003] However, with the increasing popularity of electronic equipment and the increasingly complex electromagnetic environment, electromagnetic interference problem has a serious influence on the normal operation of key switch, when interference signal is superimposed into the control circuit of display lamp, the normal voltage and current signal of display lamp can be destroyed, leading to abnormal display conditions such as flickering, constant light, extinguishing of display lamp, and electromagnetic interference can affect the logic circuit, register etc. in the internal microcontroller of key switch, so as to cause abnormal jump of internal program, and thus incorrectly judge the key state, resulting in unstable action and signal transmission etc. UTILITARY MODEL

[0004] In view of the deficiencies of prior art, the utility model provides a key switch of preventing electromagnetic interference, which comprises a top shell, an outer cover, a key, a circuit board, the top shell is arranged on the top of the key and detachably connected with the outer cover, an electromagnetic shielding cap is arranged between the top shell and the key, an electromagnetic shielding layer is arranged on the inner wall of the outer cover, a display lamp is fixedly arranged on the top shell, and the display lamp is connected with the circuit board through the gap between the electromagnetic shielding cap and the electromagnetic shielding layer.

[0005] A micro-motion assembly is arranged at the bottom of the key, a base is arranged at the top of the base, a reset spring is arranged between the key and the base, and the circuit board is arranged in the base

[0006] The utility model further sets up that: the outer cover is composed of outer cover A and outer cover B, and is connected through buckle.

[0007] The utility model further sets up that: the top shell and the outer cover are connected through bolts.

[0008] The utility model further sets up that: the micro-motion assembly is composed of a microcontroller and an elastic shell, and the microcontroller is sleeved in the elastic shell.

[0009] The utility model further sets up that: the electromagnetic shielding cap and the electromagnetic shielding layer are all made of multilayer composite structure, which comprises conductive rubber layer, metal braided mesh layer and nanometer graphite coating arranged in sequence from inside to outside.

[0010] The utility model further sets up: electromagnetic shield cap and electromagnetic shield layer and elastic shell all adopt multilayer composite structure, contain conductive rubber layer, metal braided mesh layer and nanometer graphite coating which are sequentially arranged from inside to outside.

[0011] The utility model further sets up: top shell adopts polycarbonate.

[0012] In conclusion, the utility model relates to a kind of key switch of anti-electromagnetic interference, mainly including top shell, outer cover shell, key, circuit board etc., electromagnetic shield cap is equipped between the top shell and key, electromagnetic shield layer is equipped in outer cover shell inner wall, display lamp is connected with circuit board through the gap between the two. Key bottom is equipped with micro-motion component, base top is equipped with micro-motion component, reset spring is equipped between key and base, and circuit board is placed in base. Key bottom is equipped with micro-motion component, microcontroller is sleeved in elastic shell. Electromagnetic shield cap, electromagnetic shield layer are made of multilayer composite structure, including conductive rubber layer, metal braided mesh layer and nanometer graphite coating, provide multiple shielding protection, top shell adopts polycarbonate material, with strength and light weight, the utility model solves the influence of electromagnetic interference to display lamp and microcontroller, guarantees that key switch normally operates. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is the three-dimensional structure schematic diagram of the utility model;

[0014] Figure 2 It is the internal section schematic diagram of the utility model;

[0015] Figure 3 It is Figure 2 Local enlarged structure schematic diagram of;

[0016] Figure 4 It is Figure 2 Local enlarged structure schematic diagram of;

[0017] Figure 5 It is Figure 2 Local enlarged structure schematic diagram of;

[0018] Figure 6 It is the outer cover shell schematic diagram of the utility model;

[0019] Figure 7 It is the composite structure schematic diagram of the utility model.

[0020] Reference numeral: 1, top shell;2, outer cover shell;3, key;4, circuit board;5, micro-motion component;6, base;7, reset spring;10, electromagnetic shield cap;20, electromagnetic shield layer;50, microcontroller;51, elastic shell;60, positioning protrusion;101, conductive rubber layer;102, metal braided mesh layer;103, nanometer graphite coating;201, display lamp. DETAILED DESCRIPTION

[0021] The utility model is further explained in detail below in combination with the drawings.

[0022] As Figures 1-2 The utility model discloses a key switch of anti-electromagnetic interference, including top shell 1, cover shell 2, key 3, circuit board 4, top shell 1 is located at the top of key 3 and is detachably connected with cover shell 2, sets up electromagnetic shield cap 10 between top shell 1 and key 3, can effectively shield the electromagnetic signal that key 3 generates in the operation process leaks outward, not only can avoid the electromagnetic interference to surrounding electronic equipment, can also ensure that key 3 is not influenced by external electromagnetic environment.

[0023] Referring Figures 1-4 , the inner wall of cover shell 2 is provided with an electromagnetic shielding layer 20, which further enhances the electromagnetic shielding capability of the entire key switch, the top shell 1 is fixedly provided with a display lamp 201, the display lamp 201 is connected with the circuit board 4 through the gap of the electromagnetic shield cap 10 and the electromagnetic shielding layer 20, the display lamp is connected with the circuit board through the gap of the electromagnetic shield cap and the electromagnetic shielding layer, effectively blocking the electromagnetic signal leakage and external interference, maintaining the stable operation environment of the utility model, and providing stable electrical connection for the display lamp 201, so that it can accurately feedback the working state and avoid the display lamp from flickering, constantly lighting, extinguishing abnormally and other abnormal display caused by external electromagnetic interference.

[0024] As Figures 2-3 The bottom of the key 3 is provided with a cooperating micro-motion assembly 5, and the micro-motion assembly 5 is composed of a microcontroller 50 and an elastic shell 51. The elastic shell 51 can physically protect the microcontroller 50 from damage caused by external force impact such as vibration and collision, prolong the service life, and improve the reliability of the key switch; provide a stable installation environment for the microcontroller 50, reduce looseness and displacement, ensure stable signal reception and processing, and improve performance stability; when the key is operated, the elasticity of the elastic shell 51 can buffer the impact force, protect the microcontroller 50, and also make the key feel more comfortable and improve user experience, and the whole is placed under the protection of the electromagnetic shield cap 10 and the electromagnetic shielding layer 20, avoiding abnormal jump, so as to incorrectly judge the key state and cause unstable action and signal transmission.

[0025] The micro-motion assembly 5 is arranged on the top of the base 6, and a reset spring 7 is arranged between the key 3 and the base 6; the circuit board 4 is arranged in the base 6, and a plurality of positioning protrusions 60 are arranged on the bottom of the base 6, and the circuit board 4 is arranged on the positioning protrusions 60. The base 6 provides stable support for the internal circuit board 4 and mechanical components, preventing displacement or damage during use, and cooperates with the cover shell 2 to form a relatively closed space, further enhancing the protection of internal components.

[0026] Referring to Figure 1 , Figure 5 , the outer shell 2 is composed of outer shell A and outer shell B, which are connected through buckling, and the top shell 1 and the outer shell 2 are connected through bolts, so that the utility model is more rapid, convenient when assembling or subsequent maintenance, replacing parts.

[0027] As Figure 2 , Figure 6 indicated, the electromagnetic shielding cap 10 and the electromagnetic shielding layer 20 are both made of a multi-layer composite structure, including conductive rubber layer 101, metal woven mesh layer 102 and nano graphite coating 103 arranged from inside to outside, wherein the conductive rubber layer 101 is soft, can be attached to the surface, provides preliminary shielding and buffering; the metal woven mesh layer 102 efficiently reflects and scatters medium and high frequency electromagnetic signals, also plays a structural support role; the nano graphite coating 103 can absorb and attenuate low frequency electromagnetic signals, widen the shielding frequency band, and has oxidation resistance and corrosion resistance, thereby improving the overall shielding effect and service life, finally the top shell 1 is made of polycarbonate, polycarbonate has good mechanical properties, high strength and good toughness; at the same time, polycarbonate also has excellent insulation performance, can avoid the influence of electromagnetic shielding effect caused by leakage and other problems, further enhances the stability and reliability.

[0028] The above is only the preferred embodiment of the utility model, and is not used to limit the utility model, any modification, equivalent replacement, improvement, etc. within the design concept of the utility model should be included in the protection scope of the utility model.

Claims

1. An electromagnetic interference resistant key switch comprising a top shell (1), an outer shell (2), a key (3), a circuit board (4), characterized in that: The top shell (1) is arranged on the top of the key (3) and detachably connected with the outer shell (2), an electromagnetic shielding cap (10) is arranged between the top shell (1) and the key (3), an electromagnetic shielding layer (20) is arranged on the inner wall of the outer shell (2), a display lamp (201) is fixedly arranged on the top shell (1), and the display lamp (201) is connected with the circuit board (4) through the gap between the electromagnetic shielding cap (10) and the electromagnetic shielding layer (20). The bottom of the key (3) is provided with a matched micro-motion assembly (5), a base (6) is arranged on the top of the micro-motion assembly (5), and a reset spring (7) is arranged between the key (3) and the base (6); and the circuit board (4) is arranged in the base (6).

2. The electromagnetic interference resistant pushbutton switch of claim 1, wherein: The outer shell (2) is composed of an outer shell A and an outer shell B, and the outer shell A and the outer shell B are connected through buckling.

3. The electromagnetic interference resistant pushbutton switch of claim 2, wherein: The top shell (1) and the outer shell (2) are connected through bolts.

4. The electromagnetic interference resistant pushbutton switch of claim 3, wherein: The micro-motion assembly (5) is composed of a microcontroller (50) and an elastic shell (51), and the microcontroller (50) is sleeved in the elastic shell (51).

5. The electromagnetic interference resistant pushbutton switch of claim 4, wherein: The electromagnetic shielding cap (10) and the electromagnetic shielding layer (20) are both made of a multi-layer composite structure, which comprises, from inside to outside, a conductive rubber layer (101), a metal woven mesh layer (102) and a nano-graphite coating layer (103).

6. The electromagnetic interference resistant pushbutton switch of claim 5, wherein: The bottom of the base (6) is provided with a plurality of positioning protrusions (60), and the circuit board (4) is arranged on the positioning protrusions (60).

7. The electromagnetic interference resistant pushbutton switch of claim 6, wherein: The top shell (1) is made of polycarbonate.

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