Membrane switch button

Abstract

The utility model discloses a diaphragm switch button, which comprises a button seat, a reset spring and a switch shaft capable of moving up and down in the button seat, a pin extends out of the bottom of the button seat, a diaphragm switch in conductive connection with the pin is further arranged in the button seat, a first magnetic attraction piece is installed on the switch shaft, and a second magnetic attraction piece is installed on the switch shaft. A second magnetic attraction piece is fixed on the diaphragm switch; when the switch shaft is pressed to move downwards, the first magnetic piece is close to the second magnetic piece to generate magnetic force, so that the diaphragm switch is triggered to generate a switch signal. According to the scheme, the magnetic attraction force is ingeniously utilized to achieve signal triggering of the diaphragm switch, so that the key can fully utilize the advantages of the diaphragm switch, non-contact triggering of the diaphragm switch can be achieved, abrasion to the diaphragm switch is reduced, the service life of the key is remarkably prolonged, a complex mechanical contact pressing structure is not needed, manufacturing and mass production are facilitated, and the cost is reduced. Wide market prospects are realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of key, concretely relates to a diaphragm switch key. BACKGROUND

[0002] The diaphragm switch is a common electronic component, and is widely used in the fields of electronic equipment, household appliances, automobiles, medical devices, industrial automation and the like. The diaphragm switch is manufactured by using a thin film material, has a small size, saves space, is convenient to integrate into various devices, and has high sensitivity and is very sensitive to external pressure or force. Even if a small force is applied, the diaphragm switch can also respond quickly and perform switching operation. In addition, the diaphragm switch has high reliability, and the design and manufacturing process are mature. When the contact is closed, the diaphragm switch has good conductivity, and when the contact is disconnected, the diaphragm switch can effectively cut off the circuit to avoid failure. The diaphragm switch generally comprises a conductive diaphragm located on an upper layer and a circuit board located on a lower layer. When the conductive diaphragm is pressed, the conductive diaphragm moves towards the circuit board, so that the conductive diaphragm is in contact with the circuit board, the circuit is turned on, and a signal is triggered. When the conductive diaphragm is released, the conductive diaphragm has elasticity and can be reset automatically. The conductive diaphragm is separated from the circuit board, and the circuit is disconnected.

[0003] Although the diaphragm switch is an excellent switching component, it is rarely used in the field of keys in the prior art. Currently, common keys include traditional mechanical contact switch keys, light-against-pipe switch keys, Hall switch keys, inductance switch keys and the like. If the diaphragm switch is used as a switching signal triggering element of the key, the triggering problem needs to be solved. If the diaphragm switch is pressed by physical contact to trigger, a relatively complex internal mechanical structure of the key needs to be designed. Due to frequent friction or collision of physical contact, the conductive diaphragm will be worn, thereby affecting the reliability and service life of the switch. The development engine of the present innovation is based on the above, and provides a structure and technical scheme for introducing the diaphragm switch into the key. SUMMARY

[0004] In view of the above problems, the utility model aims at providing a key for triggering a diaphragm switch to generate a switching signal in a non-contact manner.

[0005] To achieve the technical purpose, the utility model provides a diaphragm switch key, which comprises a key seat, a reset spring and a switch shaft capable of moving up and down in the key seat. The bottom of the key seat extends with a pin. A diaphragm switch in electrically conductive connection with the pin is arranged in the key seat. A first magnetic attraction member is arranged on the switch shaft. A second magnetic attraction member is fixed on the diaphragm switch. When the switch shaft is pressed downward, the first magnetic attraction member approaches the second magnetic attraction member to generate a magnetic force, so that the diaphragm switch is triggered to generate a switching signal.

[0006] As preferred, the membrane switch comprises a membrane switch PCB board and a conductive membrane arranged on the membrane switch PCB board, the second magnetic member is arranged on the conductive membrane, and the magnetic force generated when the first magnetic member approaches the second magnetic member makes the conductive membrane deform towards the membrane switch PCB board.

[0007] As preferred, the first magnetic member is a permanent magnet, and the second magnetic member is a metal block that can be attracted by the permanent magnet, and the membrane switch is vertically arranged on one side of the switch shaft in the direction that the conductive membrane is away from the switch shaft.

[0008] As preferred, the pin extends inside the key seat and has a conductive end at the end thereof, the membrane switch PCB board is provided with a contact end, and the conductive end is electrically connected with the contact end on the membrane switch PCB board.

[0009] As preferred, a protective cover is further included, the protective cover is independently arranged in the key seat, the protective cover has a cavity, and the conductive membrane and the second magnetic member are arranged in the cavity.

[0010] As preferred, the protective cover is a reverse "convex" structure, the key seat is provided with a protective cover limiting groove, both sides of the protective cover are provided with a latch, and the protective cover is fixed in the protective cover limiting groove through the latch.

[0011] As preferred, the conductive end is bent with a bayonet structure that can abut against both sides of the membrane switch PCB board, the minimum inner diameter of the bayonet structure is less than or equal to the thickness of the membrane switch PCB board, and the contact end of the membrane switch PCB board and the bayonet structure of the conductive end abut against each other to realize electrical connection.

[0012] As preferred, the key seat is further provided with a conductive end limiting groove for fixing the conductive end, and the key seat is provided with two pins, and the two pins are located at both ends of the membrane switch PCB board.

[0013] As preferred, the side wall of the switch shaft has an extension with a U-shaped open structure, the extension is provided with a mounting groove for limiting the first magnetic member, the end of the open structure is provided with a limiting protrusion, and the first magnetic member is mounted on the extension by passing the limiting protrusion from the open structure.

[0014] As preferred, a main PCB board is further included, which is arranged at the bottom of the key seat and is electrically connected with a Hall element, and when the switch shaft is pressed, the first magnetic member can trigger the Hall element to generate an electrical signal.

[0015] The utility model discloses a beneficial effect is: this scheme cleverly utilizes magnetic attraction to realize the signal trigger of diaphragm switch, makes the key can make full use of the advantage of diaphragm switch, can realize the non - contact type trigger of diaphragm switch, reduced the wear and tear of diaphragm switch, the key life has been improved significantly, and need not complex mechanical contact press structure, convenient for manufacturing and mass production, has broad market prospect. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the explosion drawing of the utility model;

[0017] Figure 2 It is the structure schematic drawing of switch shaft in the utility model;

[0018] Figure 3 It is the structure schematic drawing of protective cover in the utility model;

[0019] Figure 4 It is the structure schematic drawing of key seat in the utility model;

[0020] Figure 5 It is the structure schematic drawing of diaphragm switch PCB board and conductive diaphragm, second magnetic attraction piece in the utility model;

[0021] Figure 6 It is the structure schematic drawing of pin and diaphragm switch PCB board in the utility model;

[0022] Figure 7 It is the internal structure schematic drawing of the utility model.

[0023] In the drawing: 1, key seat;101, protective cover limiting slot;102, conductive end limiting slot;2, reset spring;3, switch shaft;31, extension;32, installation slot;33, limiting protrusion;4, pin;401, conductive end;402, bayonet structure;5, diaphragm switch PCB board;51, contact end;6, conductive diaphragm;7, second magnetic attraction piece;8, first magnetic attraction piece;9, protective cover;901, bolt;902, cavity;10, main PCB board;11, hall element;12, conductive socket. DETAILED DESCRIPTION

[0024] The utility model will be further explained in detail in combination with the drawings and specific embodiment. In order to clearly and completely describe the technical scheme, therefore selects the following embodiment to explain;The following embodiment is a part of embodiment of the utility model;Based on the application, other embodiments obtained under the prerequisite of not making creative labor all belong to the protection scope of the utility model.

[0025] In the following embodiments, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", "top / bottom" and the like orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of clearly describing the embodiments, and do not indicate or imply that the devices or elements referred to must have a particular orientation, so it cannot be understood as a limitation on the present application. At the same time, "first", "second" in the embodiments are only used for distinguishing description purposes, and do not represent relative importance.

[0026] As Figures 1-7 shown, the specific embodiment of the utility model relates to a diaphragm switch key, including key seat 1, reset spring 2 and the switch shaft 3 that can move up and down in key seat 1, reset spring 2 is installed between switch shaft 3 and key seat 1. The pin 4 is protruded at the bottom of key seat 1, and a diaphragm switch electrically connected with the pin 4 is further arranged in the key seat 1, the first magnetic attraction piece 8 is installed on the switch shaft 3, and the second magnetic attraction piece 7 is fixed on the diaphragm switch;When the switch shaft 3 is pressed down, the first magnetic attraction piece 8 approaches the second magnetic attraction piece 7 to generate magnetic force, so that the diaphragm switch is triggered to generate switch signal.

[0027] Specifically, the diaphragm switch includes diaphragm switch PCB board 5 and conductive diaphragm 6, the pin 4 extends inside the key seat 1 and its end forms a conductive end 401, the diaphragm switch PCB board 5 is provided with a contact end 51, the conductive end 401 is electrically connected with the contact end 51 on the diaphragm switch PCB board 5, the conductive diaphragm 6 is located on one side of the diaphragm switch PCB board 5, and the second magnetic attraction piece 7 is arranged on the conductive diaphragm 6. When the first magnetic attraction piece 8 approaches, the second magnetic attraction piece 7 can be attracted by the first magnetic attraction piece 8, so that the conductive diaphragm 6 is deformed, and this deformation triggers the diaphragm switch to generate switch signal.

[0028] The scheme can realize the deformation of the conductive diaphragm 6 through magnetic attraction force, avoid traditional mechanical contact wear, when the switch shaft 3 is pressed down, the first magnetic attraction piece 8 approaches the second magnetic attraction piece 7, the magnetic force makes the second magnetic attraction piece 7 drive the conductive diaphragm 6 to deform, so that the diaphragm switch circuit is conducted to generate switch signal;After releasing the switch shaft 3, the reset spring 2 pushes the switch shaft to rebound and reset, the first magnetic attraction piece 8 is away from the second magnetic attraction piece 7, the magnetic force disappears, and the conductive diaphragm 6 is elastically reset, and the circuit of the diaphragm switch is disconnected.

[0029] It should be emphasized that the first magnetic member 8 and the second magnetic member 7 can be any magnetic or magnetically attractive material known in the art that can repel or attract each other. For example, the first magnetic member 8 and the second magnetic member 7 can be magnetic materials that attract each other (e.g., permanent magnets or one of which is a permanent magnet and the other is a metal block that can be magnetically attracted), and the conductive diaphragm 6 is arranged between the first magnetic member 8 and the second magnetic member 7, and the first magnetic member 8 is attracted to the second magnetic member 7 when it is close to the second magnetic member 7, so that the second magnetic member 7 presses the conductive diaphragm 6 to deform. For another example, the first magnetic member 8 and the second magnetic member 7 can be magnetic materials that repel each other (e.g., permanent magnets of the same pole repel each other), and the second magnetic member 7 is arranged on the side of the conductive diaphragm 6 close to the first magnetic member 8, and the first magnetic member 8 repels the second magnetic member 7 when it is close to the second magnetic member 7, so that the second magnetic member 7 presses the conductive diaphragm 6 to deform.

[0030] In a further preferred embodiment, a Hall element 11 is further arranged on the main PCB 10, and when the switch shaft 3 is pressed, the first magnetic member 8 can trigger the Hall element 11 to generate a signal, thereby providing more signal generation methods for the key and expanding the use function of the key.

[0031] In order to make the installation of the conductive diaphragm 6 and the second magnetic member 7 more stable, as shown in Figure 3 , a protective cover 9 is further arranged in the key seat 1, the protective cover 9 has a cavity 902, and the conductive diaphragm 6 and the second magnetic member 7 are arranged in the cavity 902, thereby simplifying the assembly process and improving the sealing performance to prevent dust from entering the internal circuit. In addition, this design is convenient for the maintenance and replacement of the conductive diaphragm 6. The protective cover 9 has an inverted "convex" structure, the key seat 1 is provided with a protective cover limiting groove 101, and the protective cover 9 is provided with a latch 901 on both sides, and the protective cover 9 is fixed in the protective cover limiting groove 101 through the latch 901, thereby facilitating the accurate positioning of the protective cover 9 and the fixation through the latch 901 to prevent the displacement or loosening of the protective cover 9.

[0032] In order to ensure stable electrical connection, as shown in Figure 6 , the conductive end 401 is bent to have a bayonet structure 402 that can abut against both sides of the diaphragm switch PCB 5, and the minimum inner diameter of the bayonet structure 402 is less than or equal to the thickness of the diaphragm switch PCB 5, so that when the diaphragm switch PCB 5 is inserted into the slot, the contact end 51 of the diaphragm switch PCB 5 abuts against the bayonet structure 402 of the conductive end 401 to achieve electrical connection. The inner diameter of the bayonet is adapted to the thickness of the PCB to achieve quick insertion without welding and avoid poor contact.

[0033] As shown in Figure 4As shown, the key base 1 is also provided with a conductive end limiting groove 102 for fixing the conductive end 401 to avoid poor contact caused by the offset of the pin 4. In this embodiment, the key base 1 is provided with two pins 4, which are located at both ends of the diaphragm switch PCB board 5. The bottom of the main PCB board 10 is also provided with a conductive socket 12 that can be electrically connected to the pins 4.

[0034] like Figure 2 As shown, the side wall of the switch shaft 3 has an extension 31 with a U-shaped open structure. The extension is provided with a mounting groove 32 for limiting the first magnetic attractor 8. The end of the open structure is provided with a limiting protrusion 33 to effectively prevent the first magnetic attractor 8 from falling off. The first magnetic attractor 8 is installed on the extension by passing over the limiting protrusion 33 from the open structure, ensuring that the magnetic force is stably transmitted to the second magnetic attractor 7 when pressed.

[0035] During installation, the conductive diaphragm 6 and the second magnetic clasp 7 are first fixed within the cavity 902 of the independent protective cover 9. The cavity 902 matches the shape of the second magnetic clasp 7 and the conductive diaphragm 6. Then, the protective cover 9 is inserted into the limiting groove of the key base 1 via a pin 901. The diaphragm switch PCB board 5 is inserted into the slot of the key base 1, and its contact end 51 tightly abuts against the bayonet structure 402 of the conductive end 401 to achieve electrical connection. The first magnetic clasp 8 is installed in the U-shaped extension 31 of the switch shaft 3 and fixed by the limiting protrusion 33. This button can also be equipped with a tactile element on the switch shaft to generate a tactile sensation, making it different from a general membrane switch and combining the advantages of tactile feedback and sensitive trigger signal.

[0036] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any minor modifications, equivalent substitutions and improvements made to the above embodiments based on the technical essence of the present utility model should be included within the protection scope of the technical solution of the present utility model.

Claims

1. A diaphragm switch button, comprising a key base (1), a return spring (2), and a switch shaft (3) capable of moving up and down within the key base (1), wherein a pin (4) extends from the bottom of the key base (1), characterized in that, The key socket is also provided with a diaphragm switch that is electrically connected to the pin (4). A first magnetic chuck (8) is installed on the switch shaft (3), and a second magnetic chuck (7) is fixed on the diaphragm switch. When the switch shaft (3) is pressed down, the first magnetic chuck (8) approaches the second magnetic chuck (7) and generates a magnetic force, which triggers the diaphragm switch and generates a switch signal.

2. The diaphragm switch button according to claim 1, characterized in that: The diaphragm switch includes a diaphragm switch PCB board (5) and a conductive diaphragm (6) disposed on the diaphragm switch PCB board (5). The second magnetic attractor (7) is disposed on the conductive diaphragm (6). When the first magnetic attractor (8) approaches the second magnetic attractor (7), the magnetic force generated causes the conductive diaphragm (6) to deform toward the diaphragm switch PCB board (5).

3. The diaphragm switch button according to claim 2, characterized in that: The first magnetic attractor (8) is a permanent magnet, the second magnetic attractor (7) is a metal block that can be attracted by the permanent magnet, and the diaphragm switch is vertically arranged on one side of the switch shaft (3) with the conductive diaphragm (6) away from the switch shaft.

4. The diaphragm switch button according to claim 3, characterized in that: The pin (4) extends inside the key base (1) and its end forms a conductive end (401). The diaphragm switch PCB board (5) is provided with a contact end (51). The conductive end (401) is electrically connected to the contact end (51) on the diaphragm switch PCB board (5).

5. The diaphragm switch button according to claim 4, characterized in that: It also includes a protective cover (9), which is independently disposed in the key seat (1). The protective cover (9) has a cavity (902), and the conductive film (6) and the second magnetic attractor (7) are installed in the cavity (902).

6. The diaphragm switch button according to claim 5, characterized in that: The protective cover (9) has an inverted "convex" structure. The key seat (1) is provided with a protective cover limiting groove (101). The protective cover (9) is provided with pins (901) on both sides. The protective cover (9) is fixed in the protective cover limiting groove (101) by the pins (901).

7. The diaphragm switch button according to claim 4, characterized in that: The conductive end (401) is bent with a bayonet structure (402) that can abut against both sides of the diaphragm switch PCB board (5). The minimum inner diameter of the bayonet structure (402) is less than or equal to the thickness of the diaphragm switch PCB board (5). The contact end (51) of the diaphragm switch PCB board (5) abuts against the bayonet structure (402) of the conductive end (401) to achieve electrical connection.

8. The diaphragm switch button according to claim 4, characterized in that: The key base (1) is also provided with a conductive end limiting groove (102) for fixing the conductive end (401). The key base (1) is provided with two pins (4), which are located at both ends of the diaphragm switch PCB board (5).

9. The diaphragm switch button according to claim 4, characterized in that: The side wall of the switch shaft (3) has an extension (31) with a U-shaped open structure. The extension (31) has a mounting groove (32) for limiting the first magnetic member (8). The end of the open structure has a limiting protrusion (33). The first magnetic member (8) is installed on the extension by passing over the limiting protrusion (33) from the open structure.

10. The diaphragm switch button according to any one of claims 1-9, characterized in that: It also includes a main PCB board (10) disposed at the bottom of the key socket (1), on which a Hall element (11) is electrically connected. When the switch shaft (3) is pressed, the first magnetic attractor (8) can trigger the Hall element (11) to generate an electrical signal.

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