Force sensor switch assembly capable of preventing stress interference of printed circuit board (PCB)

Abstract

The utility model discloses a force sensor switch assembly preventing PCB stress interference, comprising a button, a PCB and a pressure sensor, the pressure sensor is arranged on the PCB, the button is arranged on the PCB at a position corresponding to the pressure sensor, the button can be pressed to apply pressure to the pressure sensor to generate a switch signal output, and the switch signal output is connected with the PCB. And a through groove for blocking the stress of the whole PCB is hollowed out around the pressure sensor on the PCB. By designing the unique through groove structure, stress conduction of the whole PCB is effectively blocked, it is ensured that the pressure sensor is not interfered by stress change of the whole PCB, the pressure sensor only receives direct pressure applied by keys, and the accuracy and stability of a force sensor switch are greatly improved.

Description

Technical Field

[0001] The utility model relates to the field of switch buttons, and particularly to a force sensor switch assembly for preventing stress interference of a PCB board. Background Art

[0002] The push-button switch, as a traditional electronic switch device, makes the moving contact contact or separate from the static contact through the pushing operation of the button, so as to realize the on-off of the circuit. However, this traditional key mechanism is limited by its mechanical structure and cannot achieve hierarchical recognition of the key pressing force, and thus cannot trigger different functions or effects according to different forces applied by the user.

[0003] To overcome this limitation, the existing switch design has introduced pressure sensor technology, using a pressure sensor as the electronic component for generating switch signals, and with a clever structural design, enabling the switch assembly to sense the pressure applied by the user on the button.

[0004] However, in actual use tests, we found that when pressing the switch, the PCB board will undergo a small deformation. This deformation will cause internal stress in the PCB board, and these stresses will conduct along the structure of the PCB and be conducted to the pressure sensor mounted on the PCB board through the connection points, thereby interfering with its sensitivity. Therefore, in the design and manufacturing process, a series of measures need to be taken to reduce or eliminate the influence of this deformation on the performance of the pressure sensor and ensure the accuracy and reliability of the switch assembly. Summary of the Utility Model

[0005] Aiming at the above problems, the utility model aims to provide a force sensor switch assembly for preventing stress interference of a PCB board.

[0006] To achieve the technical purpose, the solution of the utility model is: a force sensor switch assembly for preventing stress interference of a PCB board, including a button, a PCB board, and a pressure sensor. The pressure sensor is arranged on the PCB board, and the button is mounted on the PCB board at a position corresponding to the pressure sensor. Pressing the button can apply pressure to the pressure sensor to generate a switch signal output. It is characterized in that a through groove for blocking the stress of the entire PCB board is hollowed out around the pressure sensor on the PCB board.

[0007] Preferably, the through groove divides the PCB board into an inner board and an outer board that are connected to each other, and the pressure sensor is located on the inner board to ensure that the pressure sensor is not affected by the stress of the entire PCB board.

[0008] Preferably, through holes are provided on the inner board, and the pressure sensor is located on the through holes.

[0009] Preferably, the through groove is a U shape with corners, and the corners are rounded.

[0010] Preferably, the button includes a key seat, a reset elastic member and a key shaft disposed in the key seat. The button further has a pressure conduction member disposed on the pressure sensor, and the pressure conduction member is elastically connected to the key shaft through a tension spring. One end of the pressure conduction member abuts against the pressure sensor, and the other end is connected to the tension spring. When the key shaft is pressed downward, a gradually increasing pressure is applied to the pressure conduction member through the tension spring to the pressure sensor, thereby causing the pressure sensor to generate a pressing switch signal output.

[0011] The beneficial effect of the present utility model is that: through the design of a unique through groove structure, the stress conduction of the entire PCB board is effectively blocked, ensuring that the pressure sensor is not interfered by the stress change of the entire PCB board, so that it only receives the direct pressure applied by the button, greatly improving the accuracy and stability of the force sensor switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is an exploded view of the button in the present utility model;

[0013] Figure 2 is a schematic structural diagram of the pressure conduction member and the pressure sensor in the first embodiment of the present utility model;

[0014] Figure 3 is a schematic structural diagram of the pressure sensor and the PCB board in the first embodiment of the present utility model;

[0015] Figure 4 is a schematic structural diagram of the PCB board in the first embodiment of the present utility model;

[0016] Figure 5 is a schematic structural diagram of the pressure conduction member and the pressure sensor in the second embodiment of the present utility model;

[0017] Figure 6 is a schematic structural diagram of the pressure sensor and the PCB board in the second embodiment of the present utility model;

[0018] Figure 7 is a schematic structural diagram of the PCB board in the second embodiment of the present utility model;

[0019] Figure 8 is a schematic structural diagram of the PCB board in the third embodiment of the present utility model.

[0020] In the figure: 1, PCB board; 101, through groove; 102, inner plate; 103, outer plate; 104, through hole; 105, rounded corner; 2, pressure sensor; 3, button; 301, key seat; 302, key shaft; 303, reset elastic member; 304, tension spring; 305, key cap; 4, pressure conduction member. Detailed implementation manners

[0021] The present utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. In order to describe the technical solutions clearly and completely, the following embodiments are selected for description; the following embodiments are part of the embodiments of the present utility model; all other embodiments obtained on the basis of this application without creative work belong to the protection scope of the present utility model.

[0022] In the following embodiments, it should be noted that the orientation or positional relationships such as "upper", "lower", "left", "right", "inner", "outer", "top / bottom", etc. are all based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of clearly describing this embodiment, rather than indicating or implying that the device or element referred to must have a specific orientation, so it cannot be understood as a limitation to this application. At the same time, "first" and "second" in the embodiments are only used for the purpose of distinguishing descriptions, and do not represent indicating or implying relative importance.

[0023] As Figures 1 - 7 shown, a specific embodiment of the present utility model is a force sensor switch assembly for preventing stress interference of a PCB board, which includes a key 3, a PCB board 1, and a pressure sensor 2. The pressure sensor 2 of this switch assembly is arranged on the PCB board 1, and the key 3 is installed on the PCB board 1 at a position corresponding to the pressure sensor 2. The key 3 includes a key seat 301, a reset elastic member 303 and a key shaft 302 arranged in the key seat 301, and a key cover 305 is buckled on the key seat 301.

[0024] The key 3 further has a pressure conduction member 4 arranged on the pressure sensor 2. The pressure conduction member 4 is elastically connected to the key shaft 302 through a tension spring 304. One end of the pressure conduction member 4 abuts against the pressure sensor 2, and the other end is connected to the tension spring 304; when the key shaft 302 is pressed downwards, a gradually increasing pressure is applied to the pressure conduction member 4 through the tension spring 304 to the pressure sensor 2. Pressing the key 3 can apply pressure to the pressure sensor 2 to generate a switch signal output. The pressure sensor 2 detects the pressure change applied by the key 3 through an internal sensing element and converts this change into an electrical signal output.

[0025] In order to reduce the influence of the stress of the PCB board on the pressure sensor 2, a through groove 101 for blocking the stress of the entire PCB board 1 is hollowed out around the pressure sensor 2 on the PCB board. The through groove 101 can effectively block the stress transmission and improve the stability and accuracy of the pressure sensor 2.

[0026] Through the design of the through slot 101, the through slot 101 in the present application divides the PCB board 1 into an inner board 102 and an outer board 103 that are connected to each other. The pressure sensor 2 is located on the inner board 102, and the inner board 102 is isolated from the outer board 103 to ensure that the pressure sensor 2 is not affected by the stress of the entire PCB board 1 and is not affected during the measurement process.

[0027] To further reduce the stress influence, the present switch assembly is provided with a through hole 104 on the inner board 102, and the pressure sensor 2 is located on the through hole 104, ensuring that when the key 3 is subjected to an external force, the force can be directly transmitted to the pressure sensor 2 through the through hole 104. The scattered forces on the key 3 are concentrated, enabling the pressure sensor 2 to more directly and accurately sense the change in force, and further reducing the influence of the stress of the entire PCB board on the pressure sensor 2. In addition, the through slot 101 is a U-shaped with corners, and the corners of the through slot 101 are rounded corners 105, making the stress distribution more uniform.

[0028] The present application provides the following two specific embodiments of the through slot 101, but is not limited to the following two design forms of the through slot 101.

[0029] As Figures 3 - 4 shown, as the first specific embodiment of the through slot 101 in the present application, the through slot 101 isolates the inner board 102 from the outer board 103. The position of the inner board 102 corresponds to the area of the pressure conduction member 4. The pressure sensor 2 is placed on the entire inner board 102, and the connection between the inner board 102 and the outer board 103 is located below the pressure conduction member.

[0030] As Figures 6 - 7 shown, as the second specific embodiment of the through slot 101 in the present application, the through slot 101 isolates the inner board 102 from the outer board 103. The inner board 102 is located at the central position of the area corresponding to the switch assembly, and the pressure sensor 2 is placed on one side of the entire inner board 102.

[0031] As Figure 8 shown, as the third specific embodiment of the through slot 101 in the present application, the through slot 101 isolates the inner board 102 from the outer board 103. The position of the inner board 102 corresponds to the area of the pressure conduction member 4. The pressure sensor 2 is placed on the entire inner board 102, and the connection between the inner board 102 and the outer board 103 is located on the right side of the pressure conduction member.

[0032] The above is only the preferred embodiment of the present utility model and is not intended to limit the present utility model. Any minor modifications, equivalent replacements, and improvements made to the above embodiments based on the technical essence of the present utility model shall be included within the protection scope of the technical solution of the present utility model.

Claims

1. A force sensor switch assembly for preventing stress interference of a PCB board, comprising a button, a PCB board and a pressure sensor, wherein the pressure sensor is arranged on the PCB board, the button is installed at a position on the PCB board corresponding to the pressure sensor, and pressing the button can apply pressure to the pressure sensor to generate a switch signal output, characterized in that: The PCB board is hollowed out with a through groove surrounding the pressure sensor to block the stress of the entire PCB board.

2. The force sensor switch assembly for preventing PCB board stress interference according to claim 1, characterized in that: The through groove divides the PCB board into an inner board and an outer board that are connected to each other, and the pressure sensor is located on the inner board to ensure that the pressure sensor is not affected by the stress of the outer board of the PCB board.

3. The force sensor switch assembly for preventing PCB board stress interference according to claim 2, characterized in that: The inner plate is provided with a through hole, and the pressure sensor is located on the through hole.

4. The force sensor switch assembly for preventing PCB board stress interference according to claim 3, characterized in that: The through slot is in a U-shape with a corner, and the corner is rounded.

5. The force sensor switch assembly for preventing PCB board stress interference according to any one of claims 1 to 4, characterized in that: The key includes a key base, a reset elastic member and a key shaft arranged in the key base, and the key also has a pressure transmission component arranged on the pressure sensor. The pressure transmission component is elastically connected to the key shaft through a tension spring, one end of the pressure transmission component abuts against the pressure sensor, and the other end is connected to the tension spring; when the key shaft is pressed downward, the tension spring applies a gradually increasing pressure to the pressure transmission component to the pressure sensor, thereby causing the pressure sensor to generate a press switch signal output.

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