Force sensor switch assembly capable of preventing shaking

Abstract

The utility model discloses an anti-shake force sensor switch assembly, which comprises a bottom plate, a key and a pressure sensor, the key and the pressure sensor are assembled on the bottom plate, the key comprises a key seat, a reset spring and a key shaft, the reset spring and the key shaft are arranged in the key seat, and the key shaft can move up and down. A pressure conduction component used for triggering the pressure sensor to generate a switching signal is further installed in the key base of the key, and the key shaft applies pressure to the pressure conduction component only through the reset spring. The pressing shaft of the switch assembly applies pressure to the pressure conduction component only through the reset spring, so that unstable output signals caused by shaking of the pressing shaft are effectively avoided; besides, by matching with a pressure conduction component with a unique design, the stability of pressure conduction is further enhanced, the key is ensured to be better resistant to shaking interference when triggering the pressure sensor, and the output signal is enabled to have higher accuracy.

Description

Technical Field

[0001] The utility model relates to the field of switches, and particularly to a force sensor switch assembly for preventing shaking. Background Art

[0002] A push-button switch refers to a switch that uses a button to push a transmission mechanism to make a moving contact and a static contact connect or disconnect to achieve circuit switching. However, these traditional keying methods cannot achieve pressure grading and cannot realize different keying effects and functions through the change of force.

[0003] To solve these problems, a push-button switch assembly that uses pressure to change the output signal has emerged as the times require. The push-button switch uses a pressure sensor as an electronic component for generating switch signals, and with a clever structural design, the switch assembly can sense the pressure applied by the user on the button.

[0004] In actual use tests, we observed that when the button is fully pressed, the button will shake slightly. This shaking will cause the instability of the button, and further cause the force sensor set on one side of the button to be unevenly stressed during shaking, resulting in a large error value. To solve this problem, we proposed an innovative design of a force sensor switch assembly for preventing shaking. Summary of the Utility Model

[0005] Aiming at the above problems, the utility model aims to provide a force sensor switch assembly for preventing shaking.

[0006] To achieve the technical purpose, the solution of the utility model is: a force sensor switch assembly for preventing shaking, including a bottom plate, a button and a pressure sensor assembled on the bottom plate. The button includes a key seat, a return spring and a key shaft that can move up and down arranged in the key seat. A pressure conduction member for triggering the pressure sensor to generate a switch signal is also installed in the key seat of the button, and the key shaft applies pressure to the pressure conduction member only through the return spring.

[0007] Preferably, a guide platform with a hollow guide cavity is configured at the bottom of the key seat. The pressure conduction member is sleeved on the guide platform. The bottom end of the return spring abuts against the pressure conduction member, and the top end of the return spring abuts against the key shaft.

[0008] Preferably, a guide post matching the hollow guide cavity of the guide platform extends from the bottom of the key shaft. The guide post is installed and inserted into the hollow guide cavity, and the return spring is sleeved around the guide post and the guide platform.

[0009] Preferably, the pressure conduction member is a special-shaped plate with a through hole. The pressure conduction member is sleeved on the guide table through the through hole. A convex pressure column extends from one side of the bottom of the special-shaped plate towards the pressure sensor. A through hole corresponding to allow the pressure column to pass through is formed in the key seat, and the pressure column passes through the through hole and abuts against the pressure sensor.

[0010] Preferably, a convex guide sleeve extends from the through hole of the pressure conduction member towards the key shaft direction. The guide table penetrates into the guide sleeve from the through hole. The inner diameter of the guide sleeve matches the outer diameter of the guide table, and the return spring is sleeved on the periphery of the guide sleeve.

[0011] Preferably, a through groove for blocking the stress of the entire bottom plate is hollowed out around the pressure sensor on the bottom plate.

[0012] Preferably, the through groove divides the bottom plate into a connected inner plate and outer plate, and the pressure sensor is located on the inner plate to ensure that the force sensor is not affected by the stress of the entire PCB board.

[0013] Preferably, the pressure sensor is a weighing sensor, the bottom plate is a PCB circuit board, and the pressure sensor is surface-mounted on the PCB circuit board.

[0014] The beneficial effects of the present utility model are as follows: The push shaft of the present switch assembly only applies pressure to the pressure conduction member through the return spring, effectively avoiding the instability of the output signal caused by the shaking of the push shaft. In addition, with the uniquely designed pressure conduction member, the stability of pressure conduction is further enhanced, ensuring that the key can better resist the shaking interference when triggering the pressure sensor, and making the output signal have higher accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is an exploded view of the present utility model;

[0016] Figure 2 is a structural schematic diagram of the pressure conduction member in the present utility model;

[0017] Figure 3 is a top view of the internal structure of the present utility model;

[0018] Figure 4 is a schematic diagram of the bottom structure of the present utility model;

[0019] Figure 5 is a structural schematic diagram of the pressure conduction member in the present utility model;

[0020] Figure 6 is a structural schematic diagram of the key seat in the present utility model;

[0021] Figure 7Schematic diagram of the bottom plate and the pressure sensor in the present utility model;

[0022] Figure 8 Schematic diagram of the bottom plate in the present utility model.

[0023] In the figure: 1, key shaft; 101, guide post; 2, return spring; 3, key cover; 4, pressure conduction member; 401, guide sleeve; 402, special-shaped plate; 403, pressure column; 404, guide through hole; 5, key seat; 501, guide platform; 502, hollow guide cavity; 503, through hole; 6, pressure sensor; 7, bottom plate; 701, through groove. Specific embodiments

[0024] The following further describes the present utility model in detail with reference to the accompanying drawings and specific embodiments. For a clear and complete description of the technical solution, the following embodiments are selected for description; the following embodiments are some embodiments of the present utility model; all other embodiments obtained based on this application without creative efforts fall within the protection scope of the present utility model.

[0025] 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 drawings, and are only for clearly describing this embodiment, rather than indicating or implying that the device or element referred to must have a specific orientation, so it should not be construed 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.

[0026] As Figure 1-8 shown, a specific embodiment of the present utility model is a force sensor switch assembly for preventing shaking, including a bottom plate 7, a key assembled on the bottom plate 7, and a pressure sensor 6. The key includes a key seat 5, a return spring 2 arranged in the key seat 5, and a key shaft 1 that can move up and down. It also includes a key cover 3 buckled with the key seat 5. A limiting structure for limiting the key shaft 1 in the horizontal direction is provided between the key cover 3 and the key seat 5 to ensure the stability of the key shaft 1 and prevent the key from shaking left and right or deviating during operation.

[0027] A pressure conduction member 4 for triggering the pressure sensor 6 to generate a switch signal is also installed in the key seat 5. The key shaft 1 only applies pressure to the pressure conduction member 4 through the return spring 2. When the key shaft 1 is pressed, the key shaft 1 applies pressure to the pressure conduction member 4 through the return spring 2, and then conducts it to the pressure sensor 6. The pressure sensor 6 receives the pressure from the pressure conduction member 4 and then generates a corresponding switch signal. When the key shaft 1 is released, the key shaft 1 is reset through the return spring 2.

[0028] In order to reduce the error during output, the design of the pressure transmission component 4 needs to ensure the uniform distribution and stable transmission of pressure. Specifically, a guide platform 501 with a hollow guide cavity 502 is constructed at the bottom of the key base 5. The guide platform 501 and the key base 5 are designed as an integral whole. The pressure transmission component 4 is mounted on the guide platform 501 to ensure that when the key is pressed, the pressure can be accurately and stably transmitted to the pressure sensor 6. The bottom end of the reset spring 2 abuts against the pressure transmission component 4, and the top end of the reset spring 2 abuts against the key shaft 1.

[0029] A guide column 101 matching the hollow guide cavity 502 of the guide platform 501 extends from the bottom of the key shaft 1. The guide column 101 is an extension of the bottom of the key shaft 1, and its shape and size match the hollow guide cavity 502. After the guide column 101 is inserted into the hollow guide cavity 502, it provides a guiding effect for the up and down movement of the key shaft 1, so that the key shaft 1 can maintain a stable motion trajectory when moving up and down, reducing the instability of the pressure transmission component 4 caused by the shaking of the key shaft 1. The guide column 101 is installed and inserted into the hollow guide cavity 502, and the return spring 2 is sleeved on the periphery of the guide column 101 and the guide platform 501.

[0030] The pressure transmission component 4 is a special-shaped plate 402. The special-shaped plate 402 refers to a plate with a special shape. In the present application, it is a triangular structure with arc-shaped ear structures at both ends. The special-shaped plate 402 has a through hole 404. The through hole 404 allows the pressure transmission component 4 to be mounted on the guide platform 501. A raised pressure column 403 extends from one side of the bottom of the special-shaped plate 402 toward the pressure sensor 6. The pressure column 403 is the direct part of the pressure transmission and directly abuts against the pressure sensor 6. When the key shaft 1 is pressed, the pressure column will be pushed and directly act on the pressure sensor 6, triggering the generation of a switch signal.

[0031] The guide hole 404 of the pressure transmission component 4 extends a protruding guide sleeve 401 toward the key shaft 1, and the guide platform 501 is inserted into the guide sleeve 401 from the guide hole 404. The inner diameter of the guide sleeve 401 matches the outer diameter of the guide platform 501 to ensure that the guide platform 501 can be smoothly inserted into the guide sleeve 401. Through the close fit between the guide platforms 501 and 501, a stable supporting structure is formed, which reduces the instability of the pressure transmission component 4 caused by the shaking of the key shaft 1 and ensures the stability and accuracy of the pressure transmission. The reset spring 2 is arranged on the periphery of the guide sleeve 401.

[0032] A through hole 503 is provided on the key base 5 for allowing the pressure column 403 to pass through. The pressure column 403 passes through the through hole 503 and abuts against the pressure sensor 6, ensuring that the pressure column 403 always maintains a certain up and down path during the action. It should be noted that the special-shaped plate 402 of the pressure transmission component 4 is not completely fitted with the bottom surface of the key base 5, but there is a certain gap. This gap can allow the pressure transmission component 4 to move downward, so that the pressure column 403 can further squeeze the pressure sensor 6 and output different switch signals.

[0033] In order to further reduce the influence of the stress of the bottom plate 7 on the pressure sensor 6, a through groove 701 is hollowed out around the force sensor on the bottom plate 7 to block the stress of the entire bottom plate 7. The through groove 701 divides the bottom plate 7 into an inner plate and an outer plate that are interconnected. The pressure sensor 6 is located on the inner plate. The through groove divides the bottom plate into an inner plate and an outer plate that are interconnected, so as to ensure that the pressure sensor is not affected by the stress of the entire PCB board, thereby reducing the shaking of the pressure sensor 6 caused by stress changes.

[0034] The pressure sensor 6 in the present switch assembly is preferably a weighing sensor, which is a resistive weighing sensor. The bottom plate 7 is a PCB circuit board. The pressure sensor 6 is mounted on the PCB circuit board and adopts a resistance strain gauge. The sensor bears the external force exerted on the sensor through a spring and generates a reaction force to the external force to achieve relative static balance and convert the resistance change of the resistance strain gauge into a voltage output.

[0035] The principle of this switch assembly is that when the key is pressed, the key shaft 1 pushes the special-shaped plate 402 of the pressure sensing component downward through the reset spring 2, and the pressure column 403 on the special-shaped plate 402 moves in the through hole 503 of the key base 5 and directly acts on the pressure sensor 6. After the pressure sensor 6 senses the pressure change of the pressure column 403, it converts this pressure change into an electrical signal. According to the size of the pressure, the pressure sensor 6 outputs different electrical signals. When the key is released, the reset spring 2 pushes the key shaft 1 back to the initial position, and the pressure transmission component 4 loses the pressing force and is reset accordingly.

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

Claims

1. A force sensor switch assembly for preventing shaking, comprising a base plate, a key mounted on the base plate and a pressure sensor, wherein the key comprises a key seat, a return spring arranged in the key seat and a key shaft capable of moving up and down, characterized in that: A pressure transmission component for triggering a pressure sensor to generate a switch signal is also installed in the key base of the key, and the key shaft applies pressure to the pressure transmission component only through a return spring.

2. The anti-shake force sensor switch assembly according to claim 1, characterized in that: A guide platform with a hollow guide cavity is constructed at the bottom of the key seat, and the pressure transmission component is sleeved on the guide platform. The bottom end of the return spring abuts against the pressure transmission component, and the top end of the return spring abuts against the key shaft.

3. The anti-shake force sensor switch assembly according to claim 2, characterized in that: A guide column matching the hollow guide cavity of the guide platform extends from the bottom of the key shaft. The guide column is installed and inserted into the hollow guide cavity. The reset spring is sleeved on the periphery of the guide column and the guide platform.

4. The anti-shake force sensor switch assembly according to claim 3, characterized in that: The pressure transmission component is a special-shaped plate with a conducting hole, and the pressure transmission component is sleeved on the guide platform through the conducting hole. A protruding pressure column extends from one side of the bottom of the special-shaped plate toward the pressure sensor; a corresponding through hole is opened on the key base for the pressure column to pass through, and the pressure column passes through the through hole and abuts against the pressure sensor.

5. The anti-shake force sensor switch assembly according to claim 4, characterized in that: The conducting hole of the pressure transmission component extends a protruding guide sleeve toward the key shaft direction, the guide platform passes into the guide sleeve from the conducting hole, the inner diameter of the guide sleeve matches the outer diameter of the guide platform, and the reset spring sleeve is arranged on the periphery of the guide sleeve.

6. The anti-shake force sensor switch assembly according to any one of claims 1 to 5, characterized in that: The bottom plate is hollowed out with a through groove surrounding the pressure sensor to block the stress of the entire bottom plate.

7. The anti-shake force sensor switch assembly according to claim 6, characterized in that: The through groove divides the bottom plate into an inner plate and an outer plate that are connected to each other, and the pressure sensor is located on the inner plate to ensure that the force sensor is not affected by the stress of the entire PCB board.

8. The anti-shake force sensor switch assembly according to claim 7, characterized in that: The pressure sensor is a weighing sensor, the base plate is a PCB circuit board, and the pressure sensor is mounted on the PCB circuit board.

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