CN115804587A - Shoe-pad formula pressure sensor - Google Patents

Abstract

The invention relates to an insole pressure sensor, comprising: an electrode layer is provided with a plurality of interdigital electrodes and an integrated circuit, and the integrated circuit is connected to the plurality of interdigital electrodes; an isolation layer is located above the electrode layer; a pressure sensitive layer, the pressure-sensitive layer is located above the isolation layer, the pressure-sensitive layer is provided with a plurality of pressure-sensitive points, and the plurality of pressure-sensitive points are paired with the plurality of interdigital electrodes in the layer direction One corresponds to each other, and is used to make the pressure-sensitive point and the interdigital electrode one-to-one force contact; there is an air cavity between the electrode layer and the pressure-sensitive layer; the processor and the integrated circuit connect. The pressure-sensitive points in the pressure-sensitive layer and the interdigitated electrodes in the electrode layer perform one-to-one pressure detection to improve the accuracy of data collection, and can collect the pressure on a single pressure-sensitive point; the processor is used to collect Collect and calculate the obtained data, detect the pressure data in real time, and present the results through visual means such as heat map and force value map.

Description

An insole pressure sensor

technical field

The invention relates to the technical field of sensors, in particular to an insole pressure sensor.

Background technique

Pressure sensors are the key equipment for collecting plantar pressure. At present, most flexible sensors used for plantar pressure collection are usually integrated with capacitive or resistive sensing elements. Pressure sensors based on capacitive sensing units have low sensitivity. , Signal calibration and circuit design are relatively complicated. Most of the pressure sensors based on resistive sensing units are caused by the deformation of the internal structure of the pressure-sensitive layer with a porous or multi-layer fluffy structure. The recovery time is long and cannot be restored to the initial state, resulting in poor stability and short life of the sensor. Moreover, in order to complete the layout of multiple resistive sensing elements in a limited area, it is often connected in series or using multi-layer circuits. For integration, series wiring can cause signal interference between sensing elements. Therefore, none of the pressure sensors in the prior art can accurately and effectively detect the plantar pressure, and cannot meet the existing detection requirements.

Contents of the invention

Based on this, it is necessary to provide an insole pressure sensor for how to accurately and effectively detect plantar pressure, including:

An electrode layer, the electrode layer is provided with interdigitated electrodes and integrated circuits, the number of the interdigitated electrodes is multiple, wherein the integrated circuit is connected to a plurality of the interdigitated electrodes;

an isolation layer, the isolation layer is arranged on the upper layer of the electrode layer;

A pressure-sensitive layer, the pressure-sensitive layer is arranged on the upper layer of the isolation layer, the pressure-sensitive layer is provided with a plurality of pressure-sensitive points, and the plurality of pressure-sensitive points are connected with the plurality of interdigital electrodes One-to-one mutual alignment in the layer direction, for making the pressure-sensitive point and the interdigital electrode one-to-one force contact;

There is an air cavity between the electrode layer and the pressure-sensitive layer;

A processor, the processor is connected to the integrated circuit.

In one embodiment, a plurality of interdigital electrodes are distributed on the electrode layer, and each of the interdigital electrodes is connected with a positive lead wire and a negative lead wire.

In one of the embodiments, a plurality of the negative wires are collected into one collection wire, and the plurality of the positive wires and one collection wire together form the integrated circuit, and the integrated circuit is N+1 wiring.

In one embodiment, the interdigitated electrodes are made of electrode materials, and the electrode layer is prepared by printing the electrode materials on a flexible substrate using a screen printing technique.

In one embodiment, the pressure-sensitive points are made of pressure-sensitive materials, and the pressure-sensitive layer is prepared by printing the pressure-sensitive materials on a flexible substrate by screen printing technology.

In one of the embodiments, the isolation layer is provided with a plurality of installation positioning holes, the plurality of installation positioning holes and the plurality of interdigital electrodes correspond to each other one-to-one in the layer direction, and the interdigital electrodes At least a part of the electrode is positioned and installed in the installation positioning hole.

In one of the embodiments, the isolation layer is provided with vents, the number of the vents is multiple, and the vents are connected to the installation positioning holes.

In one of the embodiments, at least one of the isolation layer, the pressure-sensitive layer and the electrode layer is made of a flexible material.

In one embodiment, the shape and size of the electrode layer, the isolation layer and the pressure-sensitive layer are consistent, and the layers are bonded face to face.

In one of the embodiments, the data acquisition module is connected to the integrated circuit;

A data processing module, the data processing module is connected to the data acquisition module.

The existence of the isolation layer in the above-mentioned insole pressure sensor makes an air cavity exist between the electrode layer and the pressure-sensitive layer, and the design of the vent is convenient for the air in the air cavity to be discharged and filled; when the force is released, the timely filling of the air can make the The electrode layer and the pressure-sensitive layer are quickly separated to shorten the recovery time of the sensing element and ensure the stability and repeatability of the sample; the pressure-sensitive points in the pressure-sensitive layer and the interdigitated electrodes in the electrode layer are in a pair One corresponds to each other, so that the pressure-sensitive point and the interdigital electrode perform one-to-one pressure detection, which improves the accuracy of the collected data, and can collect the pressure on a single pressure-sensitive point; the processor is used to analyze the collected data Collect and calculate, so that the pressure data can be detected in real time, and the results can be presented through visual means such as heat map and force value map.

Description of drawings

Fig. 1 is the plane view of the shoe-pad type pressure sensor provided by the present invention;

Fig. 2 is the plan view of the isolation layer of the insole pressure sensor provided by the present invention;

Fig. 3 is the side view of the insole pressure sensor provided by the present invention;

Fig. 4 is a structure diagram of the pressure sensitive point, installation positioning hole, and interdigital electrode of the insole pressure sensor provided by the present invention;

Figure number:

1- pressure sensitive point;

2- Positive wire;

3- Negative wire;

4- Integrated circuit;

5-Installation positioning hole;

6- Isolation layer;

7 - air vent;

8-pressure sensitive layer;

9-electrode layer;

10 - Interdigitated electrodes.

Detailed ways

In order to make the above objects, features and advantages of the present invention more comprehensible, specific implementations of the present invention will be described in detail below in conjunction with the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, the present invention can be implemented in many other ways different from those described here, and those skilled in the art can make similar improvements without departing from the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inner", "Outer", "Clockwise", "Counterclockwise", "Axial" , "radial", "circumferential" and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying the referred device or Elements must have certain orientations, be constructed and operate in certain orientations, and therefore should not be construed as limitations on the invention.

In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

In the present invention, unless otherwise clearly specified and limited, terms such as "installation", "connection", "connection" and "fixation" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection , or integrated; it may be mechanically connected or electrically connected; it may be directly connected or indirectly connected through an intermediary, and it may be the internal communication of two components or the interaction relationship between two components, unless otherwise specified limit. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

In the present invention, unless otherwise clearly specified and limited, the first feature may be in direct contact with the first feature or the first and second feature may be in direct contact with the second feature through an intermediary. touch. Moreover, "above", "above" and "above" the first feature on the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. "Below", "beneath" and "beneath" the first feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is less horizontally than the second feature.

It should be noted that when an element is referred to as being “fixed on” or “disposed on” another element, it may be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may also be present. As used herein, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions are for the purpose of illustration only and are not intended to represent the only embodiment.

Referring to accompanying drawings 1 to 4, an embodiment of the present invention provides an insole pressure sensor, including:

The electrode layer 9 is provided with interdigital electrodes 10 and integrated circuits 4 on the electrode layer 9, the number of the interdigital electrodes 10 is multiple, wherein the integrated circuit 4 is connected to a plurality of the interdigital electrodes 10 ;

an isolation layer 6, the isolation layer 6 is arranged on the upper layer of the electrode layer 9;

A pressure-sensitive layer 8, the pressure-sensitive layer 8 is arranged on the upper layer of the isolation layer 6, and the pressure-sensitive layer 8 is provided with a plurality of pressure-sensitive points 1, and the plurality of pressure-sensitive points 1 are connected with the plurality of pressure-sensitive points 1 The interdigital electrodes 10 are one-to-one aligned with each other in the direction of the layer, for making the pressure-sensitive point 1 and the interdigital electrodes 10 one-to-one force contact;

There is an air cavity between the electrode layer 9 and the pressure sensitive layer 8;

A processor, the processor is connected to the integrated circuit 4 .

It should be noted that the shape and size of the electrode layer 9, the isolation layer 6 and the pressure-sensitive layer 8 can be designed to be the same or different, and the shapes of the electrode layer 9, the isolation layer 6 and the pressure-sensitive layer 8 can be designed as, for example, according to requirements Various regular shapes such as circles, squares, triangles, and other irregular shapes, in the embodiment shown in Figure 1, for the convenience of description, the shapes of the electrode layer 9, the isolation layer 6, and the pressure-sensitive layer 8 are limited to match the The shape of the sole of the human body is described for the technical solution, so as to better match the human body for standing.

In this embodiment, the insole pressure sensor provided by the present invention is designed in the form of a layered diagram and is divided into three layers, which are electrode layer 9 , isolation layer 6 and pressure-sensitive layer 8 . Wherein, a plurality of interdigital electrodes 10 are arranged on the electrode layer, and the plurality of interdigital electrodes 10 are distributed according to the force-bearing positions of the soles of the feet. In a preferred embodiment, 20 interdigitated electrodes 10 (the line width is 0.35 mm, the pitch is 0.75 mm, and the diameter of the outermost circle is 15.5 mm) are arranged on the electrode layer 9 . Optionally, the number of interdigital electrodes 10 is not limited. Different numbers of interdigital electrodes 10 can be selected according to the size of the sensor. The more interdigital electrodes 10 are selected, the more accurate the detection of plantar pressure will be. An integrated circuit 4 is provided on the electrode layer 9, and the integrated circuit 4 is connected to each interdigital electrode 10 on the electrode layer 9, and the pressure information generated after the interdigital electrode 10 is in contact with the pressure-sensitive point 1 is connected to each interdigital electrode 10. The integrated circuit 4 on the electrode 10 transmits.

In this embodiment, the layer direction of the plurality of pressure-sensitive points 1 and the plurality of interdigital electrodes 10 refers to the lamination direction of electrode layers, isolation layers, and pressure-sensitive layers. The plurality of pressure-sensitive points 1 and the plurality of interdigital electrodes 10 are aligned one-to-one in the direction of the layer, and it means that in the direction of the layer, the plurality of pressure-sensitive points 1 are aligned with the plurality of the interdigital electrodes 10 The projections of the interdigital electrodes 10 can overlap each other.

In this embodiment, the isolation layer 6 is arranged between the pressure-sensitive layer 8 and the electrode layer 9. Due to the isolation layer 6, an air cavity will be formed between the electrode layer 9 and the pressure-sensitive layer 8. The shape of the air cavity is similar to that of the isolation layer. The shape and size of the installation positioning hole 5 on the 6 are the same. When the electrode layer 9 and the pressure-sensitive layer 8 are in contact, the air cavity is squeezed and becomes smaller and disappears. When the electrode layer 9 and the pressure-sensitive layer 8 are separated, the air cavity loses its squeeze. Compression force restores the original shape. The electrode layer 9 and the pressure-sensitive layer 8 will be filled and discharged with air during each contact and separation process. The existence of the vent makes the discharge and filling of air more convenient; the air is discharged in time in the air cavity, which can make the pressure-sensitive The layer 8 and the electrode layer 9 contact more quickly after being pressured, and at the same time, it also avoids the influence of the air on the pressure detection during the contact process between the electrode layer 9 and the pressure-sensitive layer 8, resulting in errors; when the force is released, the air The timely filling can make the electrode layer 9 and the pressure-sensitive layer 8 separate quickly, shorten the recovery time of the sensing element, and ensure the stability and repeatability of the sample.

In this embodiment, the integrated circuit 4 on the electrode layer 9 is connected to the processor, and the existence of the processor enables the pressure data detected by the insole pressure sensor to be collected, analyzed, calculated, and finally presented in a visualized manner.

In this embodiment, the detection range of the insole pressure sensor can be regulated by adjusting the resistance value of the pressure-sensitive point 1 of the pressure-sensitive layer 8 in the sensor, the graphic design of the interdigital electrode 10, and the thickness of the isolation layer 6, which can meet different requirements. application groups.

In one embodiment, a plurality of interdigital electrodes 10 are distributed on the electrode layer 9 , and each of the interdigital electrodes 10 is connected with a positive lead 2 and a negative lead 3 .

In this embodiment, each interdigitated electrode 10 is provided with two lead wires leading out respectively, one of which is positive and the other is negative. After being subjected to pressure, the pressure-sensitive point 1 of the pressure-sensitive layer 8 and the interdigital electrode 10 contact each other. According to the resistance value on the pressure-sensitive point 1 and the contact area between the pressure-sensitive point 1 and the interdigital electrode 10, the Currents of different magnitudes are formed on the finger electrodes 10 , and the currents are accompanied by pressure information on the position of the interdigital electrodes 10 , and the pressure information is transmitted through the positive and negative wires 3 .

In one of the embodiments, each of the plurality of positive lead wires 2 is led out separately, and the negative lead wires 3 are collected into one line to form a collection lead, and a plurality of the positive lead wires 2 and a collection lead together form the set The integrated circuit 4 is described above, and the integrated circuit 4 formed in this way adopts the N+1 wiring mode.

In this embodiment, a plurality of wires are arranged on the electrode layer 9 to form an integrated circuit 4, wherein, the positive wire 2 drawn out from each interdigital electrode 10 is separately drawn out, and the negative wire 3 drawn out from each interdigital electrode 10 is shared. One wire, the entire integrated circuit 4, includes N (N is the number of interdigitated electrodes 10) positive wires 2 and one negative wire 3, which together constitute an N+1 wiring circuit. Wherein the line of the negative electrode wire 3 is limited to 1, and the negative electrode wire 3 of all the interdigitated electrodes 10 shares one, optional, wherein the number of lines of the positive electrode wire 2 is not limited, and can be any number equal to the number of the interdigitated electrodes 10 .

In a preferred embodiment, the number of interdigitated electrodes 10 on the electrode layer 9 is 20, the number of positive wires 2 drawn from the 20 interdigitated electrodes 10 is 20, and the negative wires 3 share one line, and a total of 21 wires are drawn out and distributed in on the electrode layer 9.

In this embodiment, the integrated circuit 4 adopts the N+1 wiring method, which can effectively reduce the number of wires in a limited area, increase the number of interdigital electrodes 10, and no signal interference will be generated between the interdigital electrodes 10, thereby improving the collection efficiency. Data Accuracy.

In one embodiment, the interdigital electrodes 10 are made of electrode materials, and the electrode layer 9 is prepared by printing the electrode materials on a flexible substrate by screen printing technology.

In this embodiment, the interdigitated electrodes 10 are made of electrode materials. Optionally, the selection of electrode materials is not limited, and can be any electrode material that meets the working conditions of the interdigitated electrodes 10, such as conductive silver paste or carbon paste, etc. .

In this embodiment, the electrode layer 9 is prepared by printing the electrode material on the flexible substrate by screen printing technology. screen printing plate. Its working principle is: screen printing is composed of five major elements, namely screen printing plate, scraping scraper, ink, printing table and substrate. The basic principle of screen printing is: use the basic principle of the screen printing plate's graphic part of the mesh to penetrate ink, and the non-graphic part of the mesh to be impermeable to ink. When printing, pour ink into one end of the screen printing plate, apply a certain amount of pressure on the ink part of the screen printing plate with the scraper, and at the same time, print towards the other end of the screen printing plate. The ink is squeezed by the scraper from the mesh of the graphic part to the substrate during the movement. Due to the viscosity of the ink, the imprint is fixed within a certain range. During the printing process, the scraper is always in line contact with the screen printing plate and the substrate, and the contact line moves with the movement of the scraper. Due to the screen printing plate and the substrate Keep a certain gap between them, so that the screen printing plate during printing will generate a reaction force against the scraper through its own tension. This reaction force is called rebound force. Due to the effect of resilience, the screen printing plate and the substrate are only in moving line contact, while other parts of the screen printing plate are in a state of separation from the substrate. Make the ink and the screen break and move, ensuring the printing size accuracy and avoiding the dirty substrate. When the scraper scrapes across the entire page, it lifts up, and at the same time, the screen printing plate also lifts up, and scrapes the ink back to its original position. So far it is a printing stroke. Screen printing has the following advantages: (1) It is not limited by the size and shape of the substrate. (2) The layout is soft and the printing pressure is small. (3) The ink layer has strong covering power. (4) Suitable for various types of inks. (5) Strong anti-rotation performance (6) Flexible and diverse printing methods. (7) The plate making is convenient, the price is cheap, and the technology is easy to master. (8) Strong adhesion. (9) It can be screen printed by hand or machine printed. (10) It is suitable for long-term display, and the outdoor advertisements are expressive. The interdigitated electrodes 10 are printed by screen printing technology, which is convenient for flexible adjustment of detection points and quantity according to application requirements.

In one embodiment, the pressure-sensitive point 1 is made of a pressure-sensitive material, and the pressure-sensitive layer 8 is prepared by printing the pressure-sensitive material on a flexible substrate by screen printing technology.

In this embodiment, the pressure-sensitive point 1 is made of a pressure-sensitive material. Optionally, the selection of the pressure-sensitive material is not limited, and it can be any material that meets the requirements for the preparation of the pressure-sensitive point 1, such as graphene composite Material.

In this embodiment, the selection of the pressure-sensitive material directly affects the resistance value of the pressure-sensitive point 1. By selecting different pressure-sensitive materials, the resistance value of the pressure-sensitive point 1 can be adjusted, and then the detection of the insole pressure sensor can be adjusted. scope.

In this embodiment, the pressure-sensitive point 1 is printed on the pressure-sensitive layer 8 by the pressure-sensitive material through screen printing technology, wherein the shape and size of the pressure-sensitive point 1 directly affect the resistance value of the pressure-sensitive point 1 , by controlling the size of the pressure-sensitive point 1 when the pressure-sensitive point 1 is prepared, the resistance value of the pressure-sensitive point 1 can be adjusted, thereby adjusting the detection range of the insole pressure sensor.

In one embodiment, the isolation layer 6 is provided with a plurality of installation and positioning holes 5, and the plurality of installation and positioning holes 5 correspond to the plurality of interdigital electrodes 10 in a one-to-one manner in the layer direction, and At least a part of the interdigital electrode 10 is embedded in the installation positioning hole 5 .

In this embodiment, the isolation layer 6 is provided with a plurality of installation positioning holes 5, and the installation positioning holes 5 and the interdigital electrodes 10 correspond to each other one-to-one in the layer direction, so that when the insole pressure sensor is working, the pressure sensitive point Bit 1 is subjected to pressure, and pressure-sensitive point 1 directly contacts the interdigital electrode 10 through the installation positioning hole 5, thereby changing the magnitude of the current flowing through the interdigital electrode 10, and the received pressure information is converted into current information and transmitted.

In this embodiment, the thickness of the isolation layer 6 directly affects the range of pressure values that can be detected by the insole pressure sensor, wherein the thicker the isolation layer 6, the higher the pressure value that the insole pressure sensor can detect. The thinner the isolation layer 6 is, the lower the detectable pressure value is. The thickness of the optional isolation layer 6 is not limited, and may be any thickness within a certain range.

In one of the embodiments, the isolation layer 6 is provided with a plurality of air vents 7 , and the air vents 7 are connected to the installation positioning holes 5 .

In this embodiment, the isolation layer 6 is provided with a vent 7, and the vent 7 is connected to the installation positioning hole 5; Squeeze each other, wherein the pressure-sensitive point 1 on the pressure-sensitive layer 8 and the interdigital electrode 10 on the electrode layer 9 contact each other through the installation positioning hole 5 on the isolation layer 6. After the force disappears, the pressure-sensitive layer 8 and the The electrode layers 9 are far away from each other. During this process, when the pressure-sensitive point 1 and the interdigital electrode 10 are in contact with each other, the air in the corresponding installation positioning hole 5 is discharged through the vent 7 connected to it, so that the pressure-sensitive point 1 and the interdigital electrode 10 are smoothly attached together; when the pressure-sensitive point 1 and the interdigital electrode 10 are far away from each other, the air in the corresponding installation positioning hole 5 is filled through the vent 7 connected to it, so that the pressure-sensitive point 1 and The interdigital electrodes 10 are separated smoothly; the timely filling of air can quickly separate the electrode layer 9 from the pressure-sensitive layer 8, shorten the recovery time of the sensing element, and ensure the stability and repeatability of the sample.

In one embodiment, at least one of the isolation layer 6 , the pressure-sensitive layer 8 and the electrode layer 9 is made of a flexible material.

In this embodiment, the pressure-sensitive layer 8 and the electrode layer 9 are made of flexible materials. Optionally, the flexible material for making the pressure-sensitive layer 8 and the electrode layer 9 is not limited, and may satisfy the requirements of the pressure-sensitive layer 8 and the The electrode layer 9 is made of any flexible material required, such as PET film and PI film. Optionally, the flexible material for preparing the isolation layer 6 is not limited, and can be any flexible material that meets the preparation requirements of the isolation layer 6, such as glue-coated PET, double-sided adhesive, hot-melt adhesive film, and the like.

In this embodiment, the three-layer structure of the insole pressure sensor: the isolation layer 6, the pressure-sensitive layer 8 and the electrode layer 9 are all made of flexible materials, which have good bending resistance, and the number of bending times is as high as 100,000 times. The insole pressure sensor provided by the invention has good durability.

In one of these embodiments,

The shape and size of the electrode layer 9, the isolation layer 6 and the pressure-sensitive layer 8 are consistent, and the layers are bonded face to face.

In this embodiment, the electrode layer 9 is attached to the lower surface of the isolation layer 6 face to face, and the pressure-sensitive layer 8 is attached to the upper surface of the isolation layer 6 face-to-face. The pressure-sensitive layer 8, the isolation layer 6 and the electrode layer 9 form a three-dimensional structure. In the layered structure, during the preparation process, laser cutting technology is used to complete the preparation of the isolation layer 6 , and the pressure-sensitive layer 8 and the electrode layer 9 are prepared according to the size and shape of the isolation layer 6 .

In one embodiment, the processor includes:

A data acquisition module, the data acquisition module is connected to the integrated circuit 4;

A data processing module, the data processing module is connected to the data acquisition module.

In this embodiment, the processor is divided into a data acquisition module and a data processing module, the processor is connected to the integrated circuit 4 of the electrode layer 9, the interdigital electrode 10 on the electrode layer 9 and the pressure-sensitive point 1 of the pressure-sensitive layer 8 Under the shared action, the received pressure is detected, and the pressure information is transmitted to the processor through the integrated circuit 4 . Among them, the data acquisition module is responsible for collecting the data transmitted in the integrated circuit 4, and transmitting the collected data to the data processing module; the data processing module processes the data according to the data transmitted by the data acquisition module, and processes the After completion, the data is presented in the form of heat map, force value map, etc.

In this embodiment, the category of the processor is not limited. Optionally, it can be any processor that can be connected to the integrated circuit 4 and collect and process the data transmitted by the integrated circuit 4, such as an external control unit, etc. .

The invention provides an insole pressure sensor, which has the following beneficial effects:

(1) The insole pressure sensor is prepared by printing technology, which is convenient for flexible adjustment of the detection point and quantity according to the application requirements, and the three-layer structure of the sensor is made of flexible material, which has good bending resistance, and the number of bending times is as high as 100,000 times .

(2) The existence of the isolation layer 6 in the insole pressure sensor makes an air cavity exist between the electrode layer 9 and the pressure-sensitive layer 8, and the air vent is designed to facilitate the discharge and filling of the air in the air cavity; when the force is released, the air Timely filling can quickly separate the electrode layer 9 from the pressure-sensitive layer 8, shorten the recovery time of the sensing element, and ensure the stability and repeatability of the sample.

(3) The detection range of the insole pressure sensor can be regulated by adjusting the resistance value of the pressure-sensitive layer 8 in the sensor, the graphic design of the interdigital electrode 10, and the thickness of the isolation layer 6, which can meet different application groups.

(4) The integration of sensing elements adopts the N+1 wiring method, which can effectively reduce the number of electrodes and increase the number of sensing elements in a limited area, and there will be no signal interference between sensing elements, improving the accuracy of collected data sex.

The technical features of the above-mentioned embodiments can be combined arbitrarily. To make the description concise, all possible combinations of the technical features in the above-mentioned embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, should be considered as within the scope of this specification.

The above-mentioned embodiments only express several implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but should not be construed as limiting the patent scope of the invention. It should be pointed out that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent for the present invention should be based on the appended claims.

Claims (10)

1. A shoe-pad type pressure sensor, is characterized in that, comprises: An electrode layer, the electrode layer is provided with interdigitated electrodes and integrated circuits, the number of the interdigitated electrodes is multiple, wherein the integrated circuit is connected to a plurality of the interdigitated electrodes; an isolation layer, the isolation layer is arranged on the upper layer of the electrode layer; A pressure-sensitive layer, the pressure-sensitive layer is arranged on the upper layer of the isolation layer, the pressure-sensitive layer is provided with a plurality of pressure-sensitive points, and the plurality of pressure-sensitive points are connected with the plurality of interdigital electrodes One-to-one mutual alignment in the layer direction, for making the pressure-sensitive point and the interdigital electrode one-to-one force contact; There is an air cavity between the electrode layer and the pressure-sensitive layer; A processor, the processor is connected to the integrated circuit. 2. The insole pressure sensor according to claim 1, characterized in that, A plurality of interdigital electrodes are distributed on the electrode layer, and each of the interdigital electrodes is connected with a positive lead and a negative lead. 3. The insole pressure sensor according to claim 2, characterized in that, A plurality of negative electrode wires are collected into one collection wire, and a plurality of the positive electrode wires and one collection wire together form the integrated circuit. 4. The insole pressure sensor according to claim 1, characterized in that, The interdigitated electrodes are composed of electrode materials, and the electrode layer is prepared by printing the electrode materials on a flexible substrate by screen printing technology. 5. The insole pressure sensor according to claim 1, characterized in that, The pressure-sensitive points are composed of pressure-sensitive materials, and the pressure-sensitive layer is prepared by printing the pressure-sensitive materials on the flexible substrate by screen printing technology. 6. The insole pressure sensor according to claim 1, characterized in that, The isolation layer is provided with a plurality of installation positioning holes, the plurality of installation positioning holes and the plurality of interdigital electrodes correspond to each other one-to-one in the layer direction, and at least a part of the interdigital electrodes are positioned and installed on the In the installation positioning hole. 7. The insole pressure sensor according to claim 6, characterized in that, The isolation layer is provided with air vents, the number of the air vents is multiple, and the air vents are connected to the installation positioning holes. 8. The insole pressure sensor according to claim 7, characterized in that, At least one of the isolation layer, the pressure-sensitive layer and the electrode layer is made of flexible materials. 9. The insole pressure sensor according to claim 1, characterized in that, The shape and size of the electrode layer, the isolation layer and the pressure-sensitive layer are the same, and the electrode layer, the isolation layer and the pressure-sensitive layer are bonded together along the layer direction. 10. The insole pressure sensor according to claim 1, wherein the processor comprises: A data acquisition module, the data acquisition module is connected to the integrated circuit; A data processing module, the data processing module is connected to the data acquisition module.

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