CN217483715U - Flexible multilayer structure tactile sensor - Google Patents

Abstract

The utility model relates to a flexible multilayer structure touch sensor, its structure includes top protective layer and bottom protective layer, is provided with the sensitive layer of last pressure, the sensitive layer of middle pressure and the sensitive layer of holding down pressure between top protective layer and bottom protective layer, is provided with the wall respectively between last pressure sensitive layer and the sensitive layer of middle pressure and the sensitive layer of holding down pressure, and it has the hole to open on the wall. The sensor units can also be arranged in an array, and a plurality of holes are distributed on the spacing layer in an array. Each row of holes corresponds to a strip-shaped lower pressure sensitive layer, each row of holes corresponds to a strip-shaped upper pressure sensitive layer, and each hole corresponds to a sheet-shaped middle pressure sensitive layer. The utility model discloses simple structure, convenient to use has better sensitivity, stability and great detectable scope, and flexibility and gas permeability are good, have good comfort level when wearing.

Description

Flexible multilayer structure tactile sensor

Technical Field

The utility model relates to a flexible sensor, specifically speaking are flexible multilayer structure touch sensor.

Background

The flexible sensor is used as one of flexible wearable devices, has the characteristics of being wearable, good in air permeability, strong in flexibility, not easy to be interfered by the environment, light in weight and the like, can provide motion monitoring for people in various fields, and has a very wide military application prospect. In the past few years, sensing devices such as a resistance sensor, a piezoelectric sensor, a nano friction generator and a capacitance sensor are widely researched by researchers, but the traditional sensing device has a large structure and heavy weight, and is difficult to effectively meet the development requirement of wearable equipment. With the rapid development of light, thin, and flexible electronic devices with various shapes, miniaturization and miniaturization of devices are required to adapt to special application scenarios.

Present flexible sensor gas permeability is poor, wears flexible sensor for a long time, can cause wrist skin heat dissipation inconvenient, and the comfort level is poor. Meanwhile, the existing flexible sensor has low sensitivity, poor stability and smaller detectable range.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a flexible multilayer structure touch sensor to solve the current flexible sensor and wear the less problem of comfort level difference, sensitivity low, poor stability and detectable scope.

The utility model discloses a realize like this: the utility model provides a flexible multilayer structure tactile sensor, includes top protective layer and bottom protective layer top protective layer with be provided with pressure sensitive layer, middle pressure sensitive layer and lower pressure sensitive layer between the bottom protective layer go up the pressure sensitive layer with between the middle pressure sensitive layer and middle pressure sensitive layer with lower pressure sensitive layer is provided with the wall respectively open there is the hole on the wall.

The above is a structure of one sensor unit.

Further, the pressure sensitive layer comprises carbon cloth, and a polyaniline layer is attached to the surface of the carbon cloth by using an electrodeposition method.

The sensor may also comprise a plurality of sensor units, and the sensor units are distributed in an array.

At this time, the holes are distributed on the spacing layer in a plurality of arrays.

Furthermore, each row of the holes corresponds to a strip-shaped lower pressure sensitive layer, each row of the holes corresponds to a strip-shaped upper pressure sensitive layer, and each hole corresponds to a sheet-shaped middle pressure sensitive layer.

Furthermore, the top protective layer and the bottom protective layer are connected through a suture line, the suture line divides the sensor into a plurality of units, and each unit corresponds to one hole.

Further, the ends of the upper pressure sensitive layer and the lower pressure sensitive layer extend out of the edge of the top protective layer or the bottom protective layer to be used for connecting a lead.

Further, the top protection layer, the bottom protection layer and the spacing layer are all made of non-woven fabrics or cotton materials.

The utility model discloses a multilayer structure, separate by the wall respectively between the three pressure sensitive layer, it has the hole to open simultaneously on the wall, the part that corresponds with the hole on the pressure sensitive layer can form electrically conductive intercommunication through the hole contact each other under the pressure effect, connect power and current detection device alright form the pressure detection return circuit on the two-layer pressure sensitive layer, the bigger area of contact between the two-layer pressure sensitive layer of applied pressure is bigger, resistance is smaller, the electric current that records is bigger, thereby resistance and pressure isoparametric can be calculated through the electric current that records. Because the adjacent two pressure sensitive layers are initially separated by the hole, the sensor unit has a large initial resistance value, when the sensor unit is stressed, the adjacent two pressure sensitive layers deform and contact with each other, the resistance value changes obviously, the sensitivity is very good, and the detection can be carried out only by a tiny current. Meanwhile, the sensitivity of the sensor is further improved by the structure of the three pressure sensitive layers, the multi-layer structure provides more contact areas, stress is distributed to each layer, the sensitivity and the linearity of the sensor are improved, the detectable range is enlarged, and the stability of the sensor is improved.

The pressure sensitive layer is carbon cloth, the polyaniline layer is attached to the surface of the carbon cloth by an electrodeposition method, and the carbon cloth is carbon fiber fabric, so that the pressure sensitive layer has good flexibility, air permeability and electrical conductivity. The top protective layer, the bottom protective layer and the spacing layer are made of non-woven fabrics or cotton materials, and have good flexibility and air permeability. The whole sensor that makes has better flexibility and gas permeability, and the whole sensor can be fixed on the clothing or make the wearable article through sewing, is convenient for dress and has good travelling comfort.

The utility model discloses simple structure, convenient to use has better sensitivity, stability and great detectable scope, and flexibility and gas permeability are good, have good comfort level when wearing.

Drawings

Fig. 1 is a schematic structural diagram of a single sensor unit of the present invention.

Fig. 2 is a schematic diagram of the sensor array package of the present invention.

Fig. 3 is a schematic representation of the layers of fig. 2.

In the figure: 1. a bottom protective layer; 2. a top protective layer; 3. a lower pressure sensitive layer; 4. an upper pressure sensitive layer; 5. an intermediate pressure sensitive layer; 6. a spacer layer; 7. a hole; 8. sewing; 9. a sensor unit.

Detailed Description

As shown in fig. 1, the utility model discloses can be a sensor unit 9, sensor unit 9 is multilayer structure, specifically includes top protective layer 2 and bottom protective layer 1, has set gradually last pressure sensitive layer 4, middle pressure sensitive layer 5 and lower pressure sensitive layer 3 from top to bottom between top protective layer 2 and bottom protective layer 1, is provided with wall 6 respectively between last pressure sensitive layer 4 and middle pressure sensitive layer 5 and lower pressure sensitive layer 3, it has hole 7 to open on wall 6.

Wherein, the pressure sensitive layer comprises carbon cloth, and a polyaniline layer is attached on the surface of the carbon cloth by using an electrodeposition method. .

The carbon cloth fiber after completing the polyaniline deposition process becomes a carbon cloth fiber with a thorn-shaped surface. When the three pressure sensitive layers are subjected to pressure, a strict space interlocking structure is formed between every two layers of thorn-shaped carbon cloth fibers, so that the number of conductive paths is increased, and the sensitivity of the sensor is improved by starting from microstructure design.

The top protective layer 2, the bottom protective layer 1 and the spacer layer 6 are all non-woven or cotton materials.

The sensor unit 9 is of a multilayer structure, the three pressure sensitive layers are separated by the spacing layer 6 respectively, meanwhile, the spacing layer 6 is provided with the holes 7, the parts, corresponding to the holes 7, of the pressure sensitive layers can be in mutual contact through the holes 7 under the action of pressure to form conductive communication, a power supply and a current detection device are connected to the two pressure sensitive layers to form a pressure detection loop, the larger the applied pressure is, the larger the contact area between the two pressure sensitive layers is, the smaller the resistance is, the larger the detected current is, and therefore parameters such as the resistance and the pressure can be calculated through the detected current.

Because the two adjacent pressure sensitive layers are initially separated by the hole 7, the sensor unit 9 has a large initial resistance value, when the pressure sensitive layers are stressed, the two adjacent pressure sensitive layers deform and contact with each other, the resistance value changes obviously, the sensitivity is very good, and the detection can be carried out only by a small current. Meanwhile, the sensitivity of the sensor is further increased by the structure of the three pressure sensitive layers, the multi-layer structure provides more contact areas, stress is distributed to each layer, the sensitivity and the linearity of the sensor are improved, the detectable range is enlarged, and the stability of the sensor is improved.

The pressure sensitive layer is carbon cloth, each layer of carbon cloth is used for growing polyaniline with the same amount by an electrodeposition method, and the deposition time of each surface is 20 min. The carbon cloth is carbon fiber fabric, so that the carbon cloth has better flexibility, air permeability and electrical conductivity. And the top protective layer 2, the bottom protective layer 1 and the spacing layer 6 are made of non-woven fabrics or cotton materials and have good flexibility and air permeability. The manufactured sensor has better flexibility and air permeability as a whole.

As shown in fig. 2 and 3, the sensor may also include a plurality of sensor units 9, and the sensor units 9 are distributed in an array.

In this case, there are several holes 7 distributed in an array on the spacer layer 6.

Each row of holes 7 corresponds to one strip-shaped lower pressure sensitive layer 3, each row of holes 7 corresponds to one strip-shaped upper pressure sensitive layer 4, and each hole 7 corresponds to one sheet-shaped middle pressure sensitive layer 5.

Taking a 4 × 4 array sensor structure as an example, two spacing layers 6 are respectively provided with 4 × 4 arrays of holes 7; the number of the upper pressure sensitive layers 4 is 4, 4 strip-shaped upper pressure sensitive layers 4 are parallel to each other and are spaced at a certain distance from each other, and each upper pressure sensitive layer 4 corresponds to one row of holes 7 on the spacing layer 6; the number of the lower pressure sensitive layers 3 is 4, 4 strip-shaped lower pressure sensitive layers 3 are parallel to each other and are spaced at a certain distance from each other, and each lower pressure sensitive layer 3 corresponds to one row of holes 7; the number of the middle pressure sensitive layers 5 is 4 × 4, the 4 × 4 middle pressure sensitive layers 5 are spaced apart from each other by a certain distance, and each middle pressure sensitive layer 5 corresponds to one hole 7. Meanwhile, the whole is encapsulated by the top protective layer 2 and the bottom protective layer 1, thereby forming a sensor whole having 4 × 4 sensor cells 9.

The top protective layer 2 and the bottom protective layer 1 are connected through a stitching 8, the stitching 8 divides the sensor into a plurality of units, and each unit corresponds to one hole 7. Thus the single unit divided by the stitches 8 is one sensor unit 9, and each unit is fixedly encapsulated by the stitches 8.

The ends of the upper pressure sensitive layer 4 and the lower pressure sensitive layer 3 extend out of the edge of the top protective layer 2 or the bottom protective layer 1 to be connected with a lead, and the lead is connected with a power supply and a measuring device to form different measuring loops. Because the directions of the upper pressure sensitive layer 4 and the lower pressure sensitive layer 3 are mutually vertical, one upper pressure sensitive layer 4 and one lower pressure sensitive layer 3 are only overlapped at the position corresponding to one sensor unit 9, when the position is pressed, the upper pressure sensitive layer 4 is contacted with the middle pressure sensitive layer 5, and the middle pressure sensitive layer 5 is contacted with the lower pressure sensitive layer 3, so that a conductive path is formed for current to pass through, the pressure applied to the position can be calculated by measuring the current in the loop, and the pressures at different positions can be measured.

The sensor units 9 can be arrayed in a long strip shape, a rectangular shape, a square shape and the like, and the array shape can be determined according to actual conditions.

The utility model discloses simple structure, convenient to use, small and frivolous has better sensitivity, stability and great detectable scope, and flexibility and gas permeability are good, have good comfort level when wearing, can be used for detecting human motion.

Claims (7)

1. The flexible touch sensor with the multilayer structure is characterized by comprising a top protective layer and a bottom protective layer, wherein an upper pressure sensitive layer, a middle pressure sensitive layer and a lower pressure sensitive layer are arranged between the top protective layer and the bottom protective layer, spacing layers are respectively arranged between the upper pressure sensitive layer and the middle pressure sensitive layer and between the middle pressure sensitive layer and the lower pressure sensitive layer, and holes are formed in the spacing layers.

2. The flexible multilayer tactile sensor of claim 1, wherein the pressure sensitive layer comprises a carbon cloth having a polyaniline layer attached to a surface of the carbon cloth using electrodeposition.

3. A flexible multilayer tactile sensor according to claim 1, wherein the holes are provided in a plurality and arranged in an array on the spacer layer.

4. A flexible multilayer tactile sensor according to claim 3, wherein each column of said holes corresponds to an elongated lower pressure sensitive layer, each row of said holes corresponds to an elongated upper pressure sensitive layer, and each hole corresponds to a sheet-like intermediate pressure sensitive layer.

5. The flexible multilayer tactile sensor of claim 4, wherein the top protective layer and the bottom protective layer are connected by stitches, the stitches dividing the sensor into a plurality of cells, one for each hole.

6. The flexible multilayer tactile sensor of claim 4, wherein the ends of the upper and lower pressure sensitive layers extend beyond the edges of the top or bottom protective layers for connection to wires.

7. The flexible multilayer tactile sensor of claim 1, wherein the top protective layer, the bottom protective layer, and the spacer layer are all a non-woven or cotton material.

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