Flexible touch-sensitive sensor

Abstract

The utility model relates to the field of flexible pressure sensors, and discloses a flexible touch-sensitive sensor, which comprises a substrate layer, a protective layer, a pressure-sensitive layer, a conductive bonding layer and a sensing joint, and is characterized in that the substrate layer is arranged on the upper and lower surfaces of the sensor and is divided into an upper substrate layer and a lower substrate layer; the protective layer is divided into an upper protective layer and a lower protective layer which are respectively clung to the lower surface of the upper base material layer and the upper surface of the lower base material layer; the pressure-sensitive layer is conductive hydrogel and is positioned between the upper protective layer and the lower protective layer; the conductive bonding layer is divided into a first conductive bonding layer and a second conductive bonding layer which are respectively positioned on two sides of the long ends of the protective layer and the pressure sensitive layer; the sensing connector is divided into an input connector and an output connector which are respectively connected with the first conductive bonding layer and the second conductive bonding layer. The utility model has excellent mechanical performance, can be bent, stretched and folded, and has the advantages of lightness, thinness, portability, high sensing sensitivity, biocompatibility and the like.

Description

Technical Field

[0001] This utility model relates to the field of flexible pressure sensors, specifically a flexible touch sensor. Background Technology

[0002] Hydrogels are flexible materials with hydrophilic polymer chains, sometimes called colloidal gels. They are polymeric material systems with a three-dimensional network structure, using water as the dispersion medium. Hydrogels possess excellent biocompatibility. As biofunctional materials closest to living tissues, hydrogels can directly contact human tissues, effectively preventing the loss of bodily fluids. Simultaneously, they also exhibit excellent flexibility and high tensile strength. By introducing materials with different properties into hydrogels, their mechanical properties can be further improved or additional characteristics can be imparted. Due to their biocompatibility, flexibility, and high tensile strength, hydrogels have attracted considerable attention as a matrix for flexible wearable strain sensors and are gradually becoming one of the most promising materials for flexible strain sensors.

[0003] Currently, most pressure sensors are widely used in industries such as industry, automotive, and aerospace. However, their inherent technical limitations and material properties also bring some significant drawbacks: such as poor rigid structure and mechanical adaptability. Because the materials are usually made of rigid substrates such as silicon, ceramics, or metals, they cannot be bent or stretched, making it difficult to conform to irregular surfaces such as human skin and flexible joints of robots; limited sensitivity. Most traditional sensors have weak ability to detect small pressures, with the minimum detection pressure in the kilopascal range, making it difficult to sense subtle pressures such as pulses and light touches; insufficient biocompatibility and wearing comfort. The metal or silicon-based materials of traditional pressure sensors may cause allergies or discomfort when in direct contact with the skin, requiring additional encapsulation, and are large in size and weight, making it difficult to achieve lightweight design, and resulting in poor long-term wearing comfort.

[0004] To address the problems of poor mechanical adaptability, limited sensitivity, and insufficient biocompatibility of traditional pressure sensors, it is necessary to develop a sensor based on novel technologies. Utility Model Content

[0005] The purpose of this invention is to provide a flexible touch sensor to solve the problems mentioned in the background art.

[0006] The technical solution of this utility model is as follows:

[0007] A flexible touch sensor includes a substrate layer, a protective layer, a pressure-sensitive layer, a conductive adhesive layer, and a sensing connector. The substrate layer is divided into an upper substrate layer and a lower substrate layer; the protective layer is divided into an upper protective layer and a lower protective layer; the pressure-sensitive layer is a conductive hydrogel; the conductive adhesive layer is divided into a first conductive adhesive layer and a second conductive adhesive layer, used to connect the substrate layer, the protective layer, and the pressure-sensitive layer and to transmit the resistance change signal of the pressure-sensitive layer; the sensing connector is divided into an input connector and an output connector.

[0008] According to this utility model, preferably, there are two substrate layers, which are respectively located on the upper and lower surfaces of the sensor.

[0009] According to this utility model, preferably, there are two protective layers, which are respectively attached to the lower surface of the upper substrate layer and the upper surface of the lower substrate layer.

[0010] According to this utility model, preferably, there are two conductive adhesive layers, which are located on both sides of the long end of the protective layer and the pressure-sensitive layer, respectively.

[0011] According to this utility model, preferably, the number of sensing connectors is two, which are respectively connected to the first conductive adhesive layer and the second conductive adhesive layer.

[0012] According to this utility model, preferably, the thickness of the substrate layer is 4.0-6.0 mm.

[0013] According to this utility model, preferably, the thickness of the protective layer is 1.65-1.85 mm.

[0014] According to this utility model, preferably, the thickness of the pressure-sensitive layer is 3.5-4.5 mm.

[0015] According to this utility model, preferably, the thickness of the conductive adhesive layer is 6.4-8.6 mm.

[0016] According to this utility model, preferably, the material of the substrate layer is a polymer resin, polydimethylsiloxane, polyurethane, or silicone elastomer.

[0017] According to this utility model, preferably, the protective layer is made of flexible fabric, paper-based material, elastomer composite material or graphene substrate.

[0018] According to this utility model, preferably, the pressure-sensitive layer is made of MXene composite conductive hydrogel, chitosan-based hydrogel, or polyacrylamide-based hydrogel.

[0019] According to this utility model, preferably, the conductive adhesive layer is made of metal-based epoxy resin conductive adhesive, carbon nanotube acrylate conductive adhesive, or polypyrrole polymer conductive adhesive.

[0020] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0021] 1. The present invention provides a flexible touch sensor that uses conductive hydrogel, nanomaterials and flexible substrate, which can conform to complex curved surfaces such as human skin and adapt to application scenarios that traditional rigid sensors cannot achieve, such as wearable devices and electronic skin. At the same time, the thickness is as low as millimeters, which reduces the weight of the device and improves the wearing comfort. Compared with traditional pressure sensors, it has the advantages of excellent mechanical properties and lightweight portability.

[0022] 2. The flexible touch sensor provided by this utility model achieves high sensitivity through the structural design of the stacked array and the conductive hydrogel with a three-dimensional cross-linked network structure and working through the electron-ion mixed conductivity mechanism. It can monitor weak physiological signals such as pulse and respiration, and can also identify touch signals. Its sensitivity is significantly higher than that of traditional pressure sensors.

[0023] Furthermore, the flexible touch sensor provided by this utility model uses materials such as silicone and hydrogel, which are skin-friendly and suitable for long-term contact with the human body. At the same time, its unique flexible structure reduces the risk of damage from external impacts, improves durability, and has excellent biocompatibility and safety.

[0024] Furthermore, the flexible touch sensor provided by this utility model can be extended to various application scenarios, such as the medical and health field, to monitor vital signs such as blood pressure and electromyography signals in real time, and to assist in telemedicine; in the field of robotic tactile sensing, to give robots fine tactile feedback and improve their grasping or interaction capabilities; and in the field of intelligent interaction, to be used in flexible displays, smart steering wheels, etc., to improve the naturalness of human-computer interaction. Attached Figure Description

[0025] Figure 1 This is a two-dimensional structural schematic diagram of the soil moisture sensor based on conductive hydrogel according to this utility model.

[0026] Figure 2 This is a three-dimensional structural diagram of the soil moisture sensor based on conductive hydrogel according to this utility model.

[0027] Figure 3 This is a schematic diagram showing the disassembled structure of the soil moisture sensor based on conductive hydrogel according to this utility model.

[0028] In the figure, 1 is the upper substrate layer; 2 is the lower substrate layer; 3 is the upper protective layer; 4 is the lower protective layer; 5 is the pressure-sensitive layer; 6 is the first conductive adhesive layer; 7 is the second conductive adhesive layer; 8 is the input connector; and 9 is the output connector. Detailed Implementation

[0029] 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.

[0030] Example 1

[0031] like Figure 1 , 2 As shown, a flexible touch sensor comprises, from top to bottom: an upper substrate layer 1, an upper protective layer 3, a pressure-sensitive layer 5, a lower protective layer 4, a first conductive adhesive layer 6 and a second conductive adhesive layer 7, an input connector 8 and an output connector 9, and a lower substrate layer 2. The upper substrate layer 1 and the lower substrate layer 2 are respectively disposed on the upper and lower surfaces of the sensor; the upper protective layer 3 and the lower protective layer 4 are respectively attached to the lower surface of the upper substrate layer 1 and the upper surface of the lower substrate layer 2; the pressure-sensitive layer 5 is located between the upper protective layer 3 and the lower protective layer 4; the first conductive adhesive layer 6 and the second conductive adhesive layer 7 are respectively located on both sides of the long ends of the upper protective layer 3, the lower protective layer 4, and the pressure-sensitive layer 5; the input connector 8 and the output connector 9 are respectively connected to the first conductive adhesive layer 6 and the second conductive adhesive layer 7.

[0032] The thickness of the upper substrate layer 1 and the lower substrate layer 2 is 5 mm, the thickness of the upper protective layer 3 and the lower protective layer 4 is 1.75 mm, the thickness of the pressure-sensitive layer 5 is 4 mm, and the thickness of the first conductive adhesive layer 6 and the second conductive adhesive layer 7 is 7.5 mm.

[0033] The upper substrate layer 1 and the lower substrate layer 2 are both made of polymer resin, the upper protective layer 3 and the lower protective layer 4 are both made of flexible fabric, and the pressure-sensitive layer 5 is made of MXene composite conductive hydrogel. The first conductive adhesive layer 6 and the second conductive adhesive layer 7 are both made of metal-based epoxy resin conductive adhesive.

[0034] Example 2

[0035] like Figure 3 As shown, this utility model discloses a flexible touch sensor, which can be disassembled into a substrate layer, a protective layer, a pressure-sensitive layer, a conductive adhesive layer, and a sensing connector. The substrate layer includes an upper substrate layer 1 and a lower substrate layer 2; the protective layer includes an upper protective layer 3 and a lower protective layer 4; the pressure-sensitive layer is 5; the conductive adhesive layer includes a first conductive adhesive layer 6 and a second conductive adhesive layer 7; and the sensing connector includes an input connector 8 and an output connector 9.

[0036] The pressure-sensitive layer 5 is made of Mxene composite conductive hydrogel, which has a three-dimensional cross-linked network skeleton structure and excellent mechanical properties. It has high sensitivity to minute deformations. Under the action of external force, the mechanical deformation is transmitted to the Mxene composite conductive hydrogel of the pressure-sensitive layer 5 through the upper substrate layer 1 and the upper protective layer 3 in sequence, which changes the thickness of the gel layer and causes the contact resistance of the internal conductive network to change. The resistance value of the pressure-sensitive layer changes differently with the magnitude of the external force, and the resulting electrical signal is also different.

[0037] The working principle of this flexible touch sensor is essentially to convert mechanical deformation into a quantifiable electrical signal. The Mxene composite conductive hydrogel of the pressure-sensitive layer 5 deforms in response to external force, causing a change in resistance value. The external force signal is converted into an electrical signal, which is transmitted through the input connector 8 connected to the first conductive adhesive layer 6 and the output connector 9 connected to the second conductive adhesive layer 7 to complete the touch sensing operation.

Claims

1. A flexible touch sensitive sensor, characterized by The application relates to a pressure sensor, which is composed of a substrate layer, a protective layer, a pressure-sensitive layer, a conductive adhesive layer and a sensing connector; the substrate layer comprises an upper substrate layer and a lower substrate layer; the protective layer comprises an upper protective layer and a lower protective layer; the pressure-sensitive layer is a conductive hydrogel; the conductive adhesive layer comprises a first conductive adhesive layer and a second conductive adhesive layer; and the sensing connector comprises an input connector and an output connector.

2. A flexible touch sensitive sensor as claimed in claim 1, characterized in that The substrate layer has two parts, which are arranged on the upper and lower surfaces of the sensor respectively.

3. A flexible touch sensitive sensor as in claim 1, wherein, The protective layer has two parts, which are arranged on the lower surface of the upper substrate layer and the upper surface of the lower substrate layer respectively.

4. A flexible touch sensitive sensor as in claim 1, wherein, The conductive adhesive layer has two parts, which are arranged on the two sides of the long end of the protective layer and the pressure-sensitive layer respectively.

5. A flexible touch sensitive sensor as in claim 1, wherein, The sensing connector has two parts, which are connected with the first conductive adhesive layer and the second conductive adhesive layer respectively.

6. A flexible touch sensitive sensor as in claim 1, wherein, The thickness of the substrate layer is 4.0-6.0 mm.

7. A flexible touch sensitive sensor as in claim 1, wherein, The thickness of the protective layer is 1.65-1.85 mm.

8. A flexible touch sensitive sensor as in claim 1, wherein, The thickness of the pressure-sensitive layer is 3.5-4.5 mm.

9. A flexible touch sensitive sensor as in claim 1, wherein, The thickness of the conductive adhesive layer is 6.4-8.6 mm.

Images