A skin touch sensor

Abstract

This utility model relates to the field of sensor technology and discloses a skin touch sensor, including a piezoresistive material mechanism. A stress amplification mechanism is provided at the bottom of the piezoresistive material mechanism to amplify the applied external force. An elastic support mechanism is provided at the top of the piezoresistive material mechanism to uniformly transmit the force to the piezoresistive material mechanism. The stress amplification mechanism includes a first fixed end plate, which is fixedly connected to the bottom of the piezoresistive material mechanism. A bearing is rotatably connected to the middle of the first fixed end plate, and a rotating shaft is rotatably connected to the inner wall of the bearing. In this utility model, when the flexible membrane is pressed by an external force, the long rubber head begins to bend and deform, mechanically amplifying the small external force and transmitting it to the piezoresistive material mechanism. This increases the deformation amplitude of the piezoresistive material, accelerates its deformation, and prevents the material deformation from disappearing due to insufficient external force.

Description

Technical Field

[0001] This utility model relates to the field of sensor technology, and in particular to a skin touch sensor. Background Technology

[0002] A skin tactile sensor is an electronic device that simulates the tactile function of human skin. It can sense external physical stimuli and convert these physical signals into processable electrical signals, thereby enabling the acquisition and analysis of tactile information about the environment. Skin tactile sensors are widely used in robotics, healthcare, consumer electronics, and virtual reality.

[0003] A skin-touch sensor consists of a sensing layer, a conversion layer, a signal conversion unit, a substrate and encapsulation layer, and a signal processing and interface layer. When a material is subjected to external force, its resistivity changes significantly with stress. By measuring the change in resistivity, force information can be indirectly obtained. However, under extremely low pressure, the change in material resistance is not obvious; under excessive pressure, the piezoresistive coefficient saturates, making it impossible to distinguish subtle changes in force. Even with the addition of a flexible conductive layer to sense force changes through the deformation of the flexible material, the effect is not significant. Utility Model Content

[0004] To overcome the above shortcomings, this utility model provides a skin touch sensor, which aims to improve the problem in the prior art that the material resistance change is not obvious under extremely low pressure, and the subtle changes in force cannot be distinguished.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a skin touch sensor, comprising a piezoresistive material mechanism, a stress amplification mechanism at the bottom of the piezoresistive material mechanism for amplifying the external force received, and an elastic support mechanism at the top of the piezoresistive material mechanism for uniformly transmitting the force to the piezoresistive material mechanism; the stress amplification mechanism comprises a first fixed end plate, which is fixedly connected to the bottom of the piezoresistive material mechanism, a bearing is rotatably connected to the middle of the first fixed end plate, a rotating shaft is rotatably connected to the inner wall of the bearing, a round rod is rotatably connected to the middle of the outer wall of the rotating shaft, a short rubber head is fixedly connected to one end of the round rod, and a long rubber head is fixedly connected to the other end of the round rod.

[0006] As a further description of the above technical solution:

[0007] The elastic support mechanism includes a support plate, which is fixedly connected to the top of the piezoresistive material mechanism. A spring is provided inside the support plate, and a base is fixedly connected to both the upper and lower ends of the spring. An insulating pad is fixedly connected to the top of the base.

[0008] As a further description of the above technical solution:

[0009] A first connecting plate is fixedly connected to the bottom outer side of the piezoresistive material mechanism. A flexible membrane is installed at the bottom end of the first connecting plate, and a shell is fixedly connected to the top end of the first connecting plate.

[0010] As a further description of the above technical solution:

[0011] A lamp holder is installed on the middle left side of the outer wall of the housing, and an LED bead is installed inside the lamp holder.

[0012] As a further description of the above technical solution:

[0013] A second fixed end plate is fixedly connected to the middle of the rear side of the outer shell, and the left and right ends of the second fixed end plate are slidably connected with limit grooves.

[0014] As a further description of the above technical solution:

[0015] A hinge is fixedly connected to the upper rear side of the outer casing, and a second connecting plate is fixedly connected to the front end of the hinge.

[0016] As a further description of the above technical solution:

[0017] A third fixed end plate is fixedly connected to the top rear side of the outer shell, and a breathable mesh is fixedly connected inside the third fixed end plate.

[0018] As a further description of the above technical solution:

[0019] A buckle is fixedly connected to the front left end of the outer casing, and a slot is provided on the rear left end of the outer casing. The buckle engages with the slot.

[0020] This utility model has the following beneficial effects:

[0021] 1. In this utility model, when the flexible membrane is pressed by an external force, the long rubber head begins to bend and deform, and after mechanically amplifying the small external force, it is transmitted to the piezoresistive material mechanism, which increases the deformation amplitude of the piezoresistive material, accelerates the deformation of the piezoresistive material, avoids the material deformation from disappearing due to insufficient external force, and makes the resistivity of the piezoresistive material mechanism change more timely and the effect more significant.

[0022] 2. In this utility model, when an external force is applied, the spring first deforms rapidly and transmits the force evenly to the piezoresistive material mechanism, avoiding slow local deformation of the material that would cause information transmission delay; when the external force is removed, the spring returns to its original state, causing the piezoresistive material mechanism to quickly return to its original state, so that it can deform in a timely manner in response to changes in the external force. Attached Figure Description

[0023] Figure 1This is a three-dimensional view of a skin touch sensor proposed in this utility model;

[0024] Figure 2 This is a partial structural cross-sectional view of a skin touch sensor proposed in this utility model;

[0025] Figure 3 This is a schematic diagram of a stress amplification mechanism for a skin touch sensor proposed in this utility model;

[0026] Figure 4 This is a schematic diagram of an elastic support mechanism for a skin touch sensor proposed in this utility model;

[0027] Figure 5 This is a partial structural diagram of a skin touch sensor proposed in this utility model;

[0028] Figure 6 This is a partial structural diagram of a skin touch sensor proposed in this utility model.

[0029] Legend:

[0030] 1. Piezoresistive material mechanism; 2. Stress amplification mechanism; 201. First fixed end plate; 202. Short rubber head; 203. Bearing; 204. Round rod; 205. Rotating shaft; 206. Long rubber head; 3. Elastic support mechanism; 301. Support plate; 302. Spring; 303. Base; 304. Insulating pad; 4. First connecting plate; 5. Flexible membrane; 6. Housing; 7. Lamp holder; 8. Lamp bead; 9. Second fixed end plate; 10. Limiting groove; 11. Second connecting plate; 12. Hinge; 13. Third fixed end plate; 14. Ventilation mesh; 15. Buckle; 16. Slot. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] Reference Figure 1 , Figure 2 and Figure 3This utility model provides an embodiment of a skin touch sensor, including a piezoresistive material mechanism 1. A stress amplification mechanism 2 is disposed at the bottom of the piezoresistive material mechanism 1 to amplify the applied external force. An elastic support mechanism 3 is disposed at the top of the piezoresistive material mechanism 1 to uniformly transmit the force to the piezoresistive material mechanism 1. The stress amplification mechanism 2 includes a first fixed end plate 201, which is fixedly connected to the bottom of the piezoresistive material mechanism 1. A bearing 203 is rotatably connected to the middle of the first fixed end plate 201. A rotating shaft 205 is rotatably connected to the inner wall of the bearing 203, and a rotating shaft 205 is rotatably connected to the middle of the outer wall of the rotating shaft 205. There is a round rod 204, which can rotate around the center of the rotating shaft 205. One end of the round rod 204 is fixedly connected to a short rubber head 202, and the other end of the round rod 204 is fixedly connected to a long rubber head 206. The short rubber head 202 and the long rubber head 206 will deform under external force. A lamp holder 7 is installed in the middle of the left side of the outer wall of the outer shell 6. The lamp holder 7 is installed with a lamp bead 8 inside. The brightness of the lamp bead 8 will change with the magnitude of the resistivity. A first connecting plate 4 is fixedly connected to the bottom outer side of the piezoresistive material mechanism 1. A flexible membrane 5 is installed at the bottom end of the first connecting plate 4. The flexible membrane 5 separates the long rubber head 206 from the skin. The outer shell 6 is fixedly connected to the top end of the first connecting plate 4.

[0033] Specifically, when wearing the skin tactile sensor, the flexible membrane 5 is in full contact with the skin. The flexible membrane 5 is soft and has good elasticity, which can buffer the direct pressure of the long rubber head 206 on the skin and avoid discomfort caused by friction or squeezing. The outer shell 6 isolates the piezoresistive material mechanism 1 from the external environment and reduces the influence of external temperature changes on resistivity. When the flexible membrane 5 is pressed by an external force, it indents inward, causing the long rubber head 206 to bend and deform under the pressure of the external force. This causes the round rod 204 to rotate around the shaft 205. The length of the round rod 204 at the top of the shaft 205 is shorter than that at the bottom. Due to the lever principle, the short rubber head 202 can amplify the small external force and transmit it to the piezoresistive material mechanism 1. This causes the resistivity of the piezoresistive material mechanism 1 to change significantly with the change of the external force when subjected to a small external force, making the skin touch sensor more sensitive. Then, by measuring the change in resistivity, the information of the external force can be indirectly obtained. The LED bead 8 installed in the outer shell 6 will change with the change in resistivity. The brightness of the LED bead 8 is inversely proportional to the magnitude of the resistivity. The higher the resistivity, the lower the brightness, and the lower the resistivity, the higher the brightness. This allows for a direct observation of the degree of change in the external force.

[0034] Reference Figure 2 and Figure 4The elastic support mechanism 3 includes a support plate 301, which is fixedly connected to the top of the piezoresistive material mechanism 1. A spring 302 is provided inside the support plate 301. A base 303 is fixedly connected to both the upper and lower ends of the spring 302. The base 303 restricts the lateral movement of the spring 302. An insulating pad 304 is fixedly connected to the top of the base 303 to prevent the metal spring 302 from conducting electricity and affecting the increase of resistivity. A third fixed end plate 13 is fixedly connected to the top of the rear side of the outer shell 6. A breathable mesh 14 is fixedly connected inside the third fixed end plate 13.

[0035] Specifically, when an external force is transmitted to the spring 302, the spring 302 begins to store energy, deforms rapidly, and transmits the force evenly to the piezoresistive material mechanism 1, avoiding information transmission lag and errors caused by slow local deformation of the material; when the external force is removed, the spring 302 begins to release energy and returns to its original shape, driving the piezoresistive material mechanism 1 to quickly return to its original shape, so that it can be detected in time when the external force changes again; the breathable mesh 14 connected to the back of the outer shell 6 has a special mesh structure and breathable material, which can effectively promote air circulation when worn, avoid sweat accumulation on the skin surface, greatly increase the comfort when wearing, and at the same time, can dissipate the heat generated by the skin touch sensor when working, preventing heat from accumulating inside the device and avoiding affecting the resistivity detection.

[0036] Reference Figure 1 , Figure 5 and Figure 6 A second fixed end plate 9 is fixedly connected to the middle of the rear side of the outer shell 6, and the left and right ends of the second fixed end plate 9 are slidably connected to limit grooves 10; a hinge 12 is fixedly connected to the upper middle of the rear side of the outer shell 6, and a second connecting plate 11 is fixedly connected to the front end of the hinge 12; a buckle 15 is fixedly connected to the left front end of the outer shell 6, and a slot 16 is provided on the left rear end of the outer shell 6, and the buckle 15 and the slot 16 are engaged and connected.

[0037] Specifically, the limiting grooves 10 installed on the left and right sides of the skin touch sensor can reduce the displacement of the flexible membrane 5 when the wearer is exercising vigorously, and prevent errors when detecting external forces; the buckles 15 and the slots 16 installed on the front and rear sides of the skin touch sensor prevent the wearer from loosening and falling off during vigorous exercise; the hinge 12 allows the skin touch sensor to have a certain degree of extensibility, making it more convenient to wear.

[0038] Working principle: When wearing the skin touch sensor, pull both ends until the buckle 15 and the slot 16 can close, so that the flexible membrane 5 can fully contact the skin. When the flexible membrane 5 is pressed by an external force, the long rubber head 206 begins to bend and deform under the pressure of the external force, and the round rod 204 rotates around the rotating shaft 205. The length of the round rod 204 at the upper part of the rotating shaft 205 is shorter than the length at the lower part. Due to the lever principle, the short rubber head 202 can amplify the external force and transmit it to the piezoresistive material mechanism 1, causing the piezoresistive material mechanism 1 to deform. The resistivity changes with the external force. By measuring this change in resistivity, the information of the external force can be indirectly obtained.

[0039] Simultaneously, when an external force is applied, the spring 302 first begins to store energy, rapidly deforms, and evenly transmits the force to the piezoresistive material mechanism 1, avoiding information transmission lag caused by slow local deformation of the material; when the external force is removed, the spring 302 begins to release energy and then returns to its original state, driving the piezoresistive material mechanism 1 to quickly return to its original state. The LED beads 8 connected to both sides of the outer shell 6 will increase in brightness as the resistivity of the piezoresistive material mechanism 1 decreases, allowing for a direct view of the location and degree of change of the external force distribution; while the limiting grooves 10 connected to both sides of the skin touch sensor can reduce the displacement of the flexible membrane 5 during vigorous exercise, preventing errors in detecting the location of the external force; the buckles 15 and slots 16 installed on the front and rear sides of the skin touch sensor prevent it from loosening and falling off during vigorous exercise, and the hinges 12 give it a certain degree of extensibility, making it easier to wear; the breathable mesh 14 connected to the rear side of the outer shell 6 can increase the comfort of wearing it and facilitate the heat dissipation of the skin touch sensor.

[0040] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A skin touch sensor, comprising a piezoresistive material mechanism (1), characterized in that: The bottom of the piezoresistive material mechanism (1) is provided with a stress amplification mechanism (2), which is used to amplify the external force received. The top of the piezoresistive material mechanism (1) is provided with an elastic support mechanism (3), which is used to uniformly transmit the force to the piezoresistive material mechanism (1). The stress amplification mechanism (2) includes a first fixed end plate (201), which is fixedly connected to the bottom of the piezoresistive material mechanism (1). A bearing (203) is rotatably connected to the middle of the first fixed end plate (201). A rotating shaft (205) is rotatably connected to the inner wall of the bearing (203). A round rod (204) is rotatably connected to the middle of the outer wall of the rotating shaft (205). A short rubber head (202) is fixedly connected to one end of the round rod (204), and a long rubber head (206) is fixedly connected to the other end of the round rod (204).

2. The skin touch sensor according to claim 1, characterized in that: The elastic support mechanism (3) includes a support plate (301), which is fixedly connected to the top of the piezoresistive material mechanism (1). A spring (302) is provided inside the support plate (301), and a base (303) is fixedly connected to both the upper and lower ends of the spring (302). An insulating pad (304) is fixedly connected to the top of the base (303).

3. A skin touch sensor according to claim 1, characterized in that: The bottom outer side of the piezoresistive material mechanism (1) is fixedly connected to a first connecting plate (4), a flexible membrane (5) is installed at the bottom end of the first connecting plate (4), and a shell (6) is fixedly connected to the top end of the first connecting plate (4).

4. A skin touch sensor according to claim 3, characterized in that: A lamp holder (7) is installed on the middle left side of the outer wall of the outer casing (6), and an LED bead (8) is installed inside the lamp holder (7).

5. A skin touch sensor according to claim 3, characterized in that: A second fixed end plate (9) is fixedly connected to the middle of the rear side of the outer shell (6), and the left and right ends of the second fixed end plate (9) are slidably connected to limit grooves (10).

6. A skin touch sensor according to claim 3, characterized in that: A hinge (12) is fixedly connected to the upper rear side of the outer shell (6), and a second connecting plate (11) is fixedly connected to the front end of the hinge (12).

7. A skin touch sensor according to claim 3, characterized in that: A third fixed end plate (13) is fixedly connected to the top rear side of the outer shell (6), and a breathable mesh (14) is fixedly connected inside the third fixed end plate (13).

8. A skin touch sensor according to claim 3, characterized in that: A buckle (15) is fixedly connected to the front left end of the outer shell (6), and a slot (16) is provided on the rear left end of the outer shell (6). The buckle (15) and the slot (16) are engaged and connected.

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