CN115638714B - Resistance type flexible fabric position sensor - Google Patents
Resistance type flexible fabric position sensor Download PDFInfo
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- CN115638714B CN115638714B CN202211322486.1A CN202211322486A CN115638714B CN 115638714 B CN115638714 B CN 115638714B CN 202211322486 A CN202211322486 A CN 202211322486A CN 115638714 B CN115638714 B CN 115638714B
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- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
Abstract
The invention discloses a resistance type flexible fabric position sensor, which comprises a first conductive fabric layer, an elastic isolation layer and a second conductive fabric layer which are sequentially arranged from top to bottom; the elastic isolation layer is densely provided with a plurality of through holes, the first conductive fabric layer or the second conductive fabric layer is provided with contacts matched with the through holes, and a space is reserved between the contacts and the second conductive fabric layer or the first conductive fabric layer at the other side; when pressure is applied to the surface of the first conductive fabric layer or the second conductive fabric layer, the contact points are in contact with the second conductive fabric layer or the first conductive fabric layer at the other side through the through holes to be electrified, and the resistance value corresponding to the application position is output. The invention can realize distance pressing type induction and simultaneously give consideration to the characteristics of textiles, thereby solving the problem that the existing position sensor cannot be well embedded into the textile to be taken.
Description
Technical Field
The invention belongs to the technical field of wearable electronic equipment, relates to intelligent textiles, and in particular relates to a resistance type flexible fabric position sensor with a position detection function.
Background
Since the 21 st century, with the development of technology, especially the rapid advance of the technologies of the internet, wearable, internet of things, virtual reality and intelligent textile, the demands of people for sensor technologies for input, measurement and monitoring, which are flexible and even textile and fiber-based, are increasing. One important sensing technique is a position sensor, among others. The position sensor refers to a type of sensor capable of converting position information of a measured object into other physical quantities that are convenient for measurement. The flexible textile-based position sensor can provide effective position information on a man-machine interaction interface, and the information can be used as one-dimensional input signals, curved surface distance measurement, other entertainment functions and the like. For example, the fabric position sensor integrated on the surface of the clothing or sofa can realize manual pressing of the clothing or sofa to adjust the volume of the electronic equipment (one-dimensional input signal), the fabric position sensor integrated on the surface of the fabric strip can be used for measuring the dimension of each part of the human body (curved surface distance measurement), and the fabric-based game equipment integrated on the surface can realize distance sensing as auxiliary input (entertainment function) and the like.
Conventional position sensors may be used to detect position, length, distance, orientation, etc. At present, the types of the position sensor mainly comprise electromagnetic type, photoelectric type, capacitive type, contact type and the like, are mainly made of hard materials, have no softness and water washing resistance, cannot be integrated into textiles to be taken, and limit the application of the position sensor in the fields of intelligent textiles and wearable electronic equipment.
In the technical field of electromagnetic position sensors, for example, chinese patent application (publication No. CN 107843184A) discloses a wearable miniature position sensor, which can give the position change of the sensor within 1 meter by adopting an electromagnetic wave radiation principle and can be used for capturing human body actions. But it is only suitable for measuring straight line distance, and is inconvenient to measure curve length, human dimension, or position information of human surface and textile surface.
In the technical field of intelligent textile, although various textile and fiber base material pressure sensors and matrixes exist at present, for example, chinese patent application (publication number: CN 113340480A) discloses a flexible pressure sensor and a preparation method thereof, and discrete distance measurement can be realized by arranging a plurality of pressure sensing units on the surface of a textile. However, when the sensor is used as a position sensor, a one-dimensional high-density pressure sensor sequence is required to be arranged, and the technology requires quite a plurality of connecting lines and a distributed matrix scanning means to realize pressure measurement at different positions, and measured signals approximate to discrete functions (gear distribution), so that the sensor is difficult to have the characteristics of washability, dryability, simple structure, simple circuit, one-dimensional input and the like, and the input mode of a wearable man-machine interaction interface is greatly limited by the complex equipment structure and the data reading mode.
Disclosure of Invention
The invention aims to solve the technical problems of providing the resistance type flexible fabric position sensor which is simple in structure, stable, reliable, low in cost and high in universality, and can realize distance pressing type sensing and simultaneously give consideration to the characteristics of textiles such as flexibility, wearing, washability, drying and the like, so that the problem that the existing position sensor cannot be well embedded into clothing textiles is solved.
In order to solve the technical problems, the invention adopts the following technical scheme:
a resistance type flexible fabric position sensor comprises a first conductive fabric layer, an elastic isolation layer and a second conductive fabric layer which are sequentially arranged from top to bottom;
the elastic isolation layer is densely provided with a plurality of through holes, the first conductive fabric layer or the second conductive fabric layer is provided with contacts matched with the through holes, and a distance is reserved between the contacts and the second conductive fabric layer or the first conductive fabric layer at the other side; when pressure is applied to the surface of the first conductive fabric layer or the second conductive fabric layer, the contact points are in contact with the second conductive fabric layer or the first conductive fabric layer at the other side through the through holes to be electrified, and the resistance value corresponding to the application position is output.
As a preferred embodiment of the present invention, the first conductive fabric layer and the second conductive fabric layer are each provided with a conductive wire outputting an electrical signal.
As a preferred aspect of the present invention, the first conductive fabric layer and the second conductive fabric layer are both woven from conductive fibers; the first conductive fabric layer and the second conductive fabric layer are respectively provided with a plane conductive pattern, and the plane conductive patterns are formed by weaving a fabric weave structure or digital jacquard weave.
As a preferred aspect of the present invention, the surfaces of the first conductive fabric layer and the second conductive fabric layer are both coated with a conductive coating; the first conductive fabric layer and the second conductive fabric layer are woven fabric, knitted fabric, braided fabric or non-woven fabric.
As a preferable mode of the present invention, the conductive coating is a conductive polymer film.
As a preferred scheme of the invention, the conductive coating is a conductive composite material, the conductive composite material comprises a substrate and conductive particles dispersed in the substrate, and planar conductive patterns are formed on the surfaces of the first conductive fabric layer and the second conductive fabric layer by screen printing, orifice printing, spraying or thermal bonding.
As a preferable scheme of the invention, the elastic isolation layer is an elastic film or a fabric material, and the first conductive fabric layer and the second conductive fabric layer are bonded with the elastic isolation layer through an adhesive.
As a preferable scheme of the invention, the elastic isolation layer is an elastic film, and the elastic film is made of elastic polymer material;
the elastic isolation layer is directly attached to the first conductive fabric layer through a screen printing, pore plate printing or spraying process, and one surface of the elastic isolation layer, which is far away from the first conductive fabric layer, is bonded with the second conductive fabric layer through an adhesive;
or the elastic isolation layer is directly attached to the second conductive fabric layer through a screen printing, pore plate printing or spraying process, and one surface of the elastic isolation layer, which is far away from the second conductive fabric layer, is bonded with the first conductive fabric layer through an adhesive;
or the elastic isolation layer is directly attached to the first conductive fabric layer and the second conductive fabric layer through a screen printing, pore plate printing or spraying process, and the elastic isolation layer attached to the first conductive fabric layer is bonded with the elastic isolation layer attached to the second conductive fabric layer through an adhesive.
As a preferable scheme of the invention, the elastic isolation layer is made of a fabric material, the fabric material is formed by weaving elastic yarns and inelastic yarns, one surface of the elastic isolation layer is connected with the first conductive fabric layer through a three-dimensional weaving process, and the other surface of the elastic isolation layer is connected with the second conductive fabric layer through a three-dimensional weaving process.
As a preferred embodiment of the present invention, the elastic isolation layer is an elastic film or a fabric material, and the first conductive fabric layer and the second conductive fabric layer are connected to the elastic isolation layer by a sewing thread.
Compared with the prior art, the resistance type flexible fabric position sensor provided by the invention has the beneficial effects that:
the resistance type flexible fabric position sensor can be used as position measurement, length and angle measurement equipment, one-dimensional signal input equipment and the like, has strong universality and is superior to the traditional photoelectric position sensor with the functions of position and distance measurement only; secondly, as the one-dimensional vector type resistance signal is easy to read, no complex signal reading means such as distributed matrix scanning are needed, only the resistance value one-dimensional vector signal is output, the connection is simple, the data reading is easy, the cost and the energy consumption of a data acquisition module can be saved, and the matrix type position sensor is superior to a matrix type position sensor formed by combining flexible pressure sensors; in addition, the first conductive fabric layer, the second conductive fabric layer and the elastic isolation layer are light, thin, soft, comfortable, washable, dryable and other textile-specific attributes, have strong bending fatigue resistance, shearing fatigue resistance and compression fatigue resistance, can be well embedded into clothing textiles, accurately measure position information related to a human body, and are superior to traditional hard photoelectric or silicon-based electronic components.
Drawings
In order to more clearly illustrate the technical solution of the embodiments of the present invention, the drawings of the embodiments will be briefly described below.
FIG. 1 is a schematic diagram of a resistive flexible fabric position sensor according to an embodiment of the present invention;
FIG. 2 is an exploded view of a first planar conductive pattern designed on a resistive flexible fabric position sensor;
FIG. 3 is an exploded view of a second planar conductive pattern designed on a resistive flexible fabric position sensor;
FIG. 4 is an exploded view of a third planar conductive pattern designed on a resistive flexible fabric position sensor;
FIG. 5 is an exploded view of a fourth planar conductive pattern designed on a resistive flexible fabric position sensor;
FIG. 6 is a theoretical and actual measured plot of output resistance versus measured length for a resistive flexible position sensor.
The marks in the figure:
a first conductive fabric layer 1; an elastic isolation layer 2; a second conductive fabric layer 3; a through hole 4; a contact 5; a conductive wire 6; a planar conductive pattern 7.
Detailed Description
The following describes in further detail the embodiments of the present invention with reference to the drawings and examples. The following examples are illustrative of the invention and are not intended to limit the scope of the invention.
In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. It should be understood that the terms "first," "second," and the like are used herein to describe various information, but such information should not be limited to these terms, which are used merely to distinguish one type of information from another. For example, a "first" message may also be referred to as a "second" message, and similarly, a "second" message may also be referred to as a "first" message, without departing from the scope of the invention.
Referring to fig. 1, a preferred embodiment of the present invention provides a resistive flexible fabric position sensor, which includes a first conductive fabric layer 1, an elastic isolation layer 2 and a second conductive fabric layer 3 sequentially disposed from top to bottom.
The elastic isolation layer 2 is densely provided with a plurality of through holes 4, the first conductive fabric layer 1 or the second conductive fabric layer 3 is provided with contacts 5 matched with the through holes 4, and a space is reserved between the contacts 5 and the second conductive fabric layer 3 or the first conductive fabric layer 1 at the other side; when pressure is applied to the surface of the first conductive fabric layer 1 or the second conductive fabric layer 3, the contact 5 is in contact with the second conductive fabric layer 3 or the first conductive fabric layer 1 on the other side through the through hole 4 to be electrified, and outputs a resistance value corresponding to the applied position. Wherein, the first conductive fabric layer 1 and the second conductive fabric layer 3 are provided with conductive wires 6 for outputting electric signals. It should be noted that the conductive wire 6 can be disposed outside the conductive fabric layer, that is, be a separate conductive wire; the conductive fabric layer can also be arranged on the conductive fabric layer, namely the conductive fabric layer plays a role of a conductive wire and directly outputs an electric signal. The conductive fabric layer is connected with the conductive wires 6 by means of welding, bonding, sewing, hot pressing, embroidery or weaving, and the like, so that the connection is simple and complex wiring is not needed. In using the resistive flexible fabric position sensor of the present invention, the first conductive fabric layer 1 and the second conductive fabric layer 3 are connected to the back-end circuit through conductive wires 6, respectively. When pressure is applied to the surface of the first conductive fabric layer 1 or the second conductive fabric layer 3, the contact 5 is energized by contacting the second conductive fabric layer 3 or the first conductive fabric layer 1 on the other side through the through hole 4, and the first conductive fabric layer 1, the second conductive fabric layer 3, the conductive wire 6 and the back-end circuit form a loop. Thereby, pressure is applied at different positions of the first conductive fabric layer 1 or the second conductive fabric layer 3, and a linear function relation between the output resistance and the first conductive fabric layer 1 and a linear function relation between the output resistance and the second conductive fabric layer 3 are obtained by measuring resistance values at the corresponding positions. Through measuring corresponding resistance value, substituting into the relevant function to obtain the positional information (such as length value, angle magnitude etc.) of application of force position, can be applicable to intelligent ruler, intelligent shoes and shoe-pad, intelligent schoolbag, intelligent cushion, intelligent mattress, intelligent clothing etc. and the relevant wearable intelligent fabrics of fabrics, provide functions such as position measurement, angle measurement and signal input, the commonality is stronger. For example, when the resistive flexible fabric position sensor is integrated to the upper arm position or the waist position of the garment, the dimension or the waistline of the upper arm can be measured anytime and anywhere; when the resistance type flexible fabric position sensor is integrated to the forearm position of the garment, the resistance type flexible fabric position sensor can be used as an adjustable resistor to dynamically adjust the state of the wearable device (such as adjusting the volume of an earphone or the brightness of a luminous garment).
The resistance type flexible fabric position sensor can be used as position measurement, length and angle measurement equipment, one-dimensional signal input equipment and the like, has strong universality and is superior to the traditional photoelectric position sensor with the functions of position and distance measurement only; secondly, as the one-dimensional vector type resistance signal is easy to read, no complex signal reading means such as distributed matrix scanning are needed, only the resistance value one-dimensional vector signal is output, the connection is simple, the data reading is easy, the cost and the energy consumption of a data acquisition module can be saved, and the matrix type position sensor is superior to a matrix type position sensor formed by combining flexible pressure sensors; in addition, the first conductive fabric layer 1, the second conductive fabric layer 3 and the elastic isolation layer 2 are light, thin, soft, comfortable, washable, dryable and other textile-specific properties, have strong bending fatigue resistance, shearing fatigue resistance and compression fatigue resistance, can be well embedded into clothing textiles, accurately measure position information related to a human body, and are superior to traditional hard photoelectric or silicon-based electronic components.
It should be noted that, in some embodiments, the contact 5 is in a convex structure, when pressure is applied to the surface of the first conductive fabric layer 1 or the second conductive fabric layer 3, the contact 5 can extend into the through hole 4, that is, the first conductive fabric layer 1 and the second conductive fabric layer 3 can be well contacted and electrified without applying excessive pressure.
Illustratively, the first conductive fabric layer 1 and the second conductive fabric layer 3 are woven from conductive fibers. The first conductive fabric layer 1 and the second conductive fabric layer 3 are respectively provided with a plane conductive pattern 7, and the plane conductive patterns 7 are formed by fabric weave structures or digital jacquard weaving. Wherein, the conductive fiber adopts metal plating fiber (such as silver plating fiber, copper plating fiber or gold plating fiber, etc.), fiber containing metal component (such as stainless steel fiber, etc.), conductive fiber or carbon fiber filament prepared from conductive composite material (such as polyamide/graphene, polyimide/carbon nano tube or combination of various chemical fibers and conductive particles, etc.), etc. The planar conductive pattern 7 is of any shape such as a straight line, a wave shape, a curve, a triangle, a rectangle, a square, or an artistic pattern.
Illustratively, the surfaces of the first conductive fabric layer 1 and the second conductive fabric layer 3 are each coated with a conductive coating. The first conductive fabric layer 1 and the second conductive fabric layer 3 are woven fabrics, knitted fabrics or non-woven fabrics, and the components of the first conductive fabric layer and the second conductive fabric layer are natural fibers (such as cotton, wool, silk or hemp, etc.), artificial fibers (such as nylon, terylene, etc.), or blending of the natural fibers and the artificial fibers, preferably terylene plain weave fabrics. Wherein the conductive coating is a conductive polymer film or a conductive composite material.
When the conductive coating is made of a conductive composite material, the conductive composite material comprises a substrate and conductive particles dispersed in the substrate, wherein the substrate is made of a high polymer material (such as silicone rubber, polyurethane, polyamide, polyimide or polyester, and the like), and the conductive particles are made of carbon fibers, carbon nanotubes, graphite particles, graphene, carbon black or metal powder, and the like. The conductive composite material is formed with a planar conductive pattern 7 on the surfaces of the first conductive fabric layer 1 and the second conductive fabric layer 3 by screen printing, hole plate printing, spraying or thermal bonding. Wherein, the conductive composite material is preferably a composite material of graphene and silicon rubber, and the coating process is preferably screen printing. The planar conductive pattern 7 is of any shape such as a straight line, a wave shape, a curve, a triangle, a rectangle, a square, or an artistic pattern.
Illustratively, the elastic isolation layer 2 is an elastic film or fabric material, and the first conductive fabric layer 1 and the second conductive fabric layer 3 are bonded to the elastic isolation layer 2 by an adhesive. When the elastic film is adopted, the elastic film is made of elastic polymer materials (such as silica gel, polyurethane and the like); when a fabric material is used, the type of the fabric material is a woven fabric, a knitted fabric, a woven fabric or a nonwoven fabric, and the material is natural cellulose fiber or artificial fiber, etc., preferably a warp knitting elastic fabric processed from polyurethane filaments.
The elastic isolation layer 2 is an elastic film, and the elastic film is made of an elastic polymer material (such as silica gel, polyurethane, etc.); the elastic isolation layer 2 is directly attached to the first conductive fabric layer 1 through a screen printing, pore plate printing or spraying process, and one surface of the elastic isolation layer 2, which is far away from the first conductive fabric layer 1, is bonded with the second conductive fabric layer 3 through an adhesive; or, the elastic isolation layer 2 is directly attached to the second conductive fabric layer 3 through a screen printing, pore plate printing or spraying process, and one surface of the elastic isolation layer 2 away from the second conductive fabric layer 3 is bonded with the first conductive fabric layer 1 through an adhesive; alternatively, the elastic isolation layer 2 is directly attached to the first conductive fabric layer 1 and the second conductive fabric layer 3 by a screen printing, hole plate printing or spraying process, and the elastic isolation layer 2 attached to the first conductive fabric layer 1 and the elastic isolation layer 2 attached to the second conductive fabric layer 3 are bonded by an adhesive, that is, do not exist in the form of a single isolation layer.
The adhesive may be a hot melt TPU film, a silicone, an acrylic, a phenolic or an epoxy adhesive, and is preferably a hot melt polyurethane film.
The elastic isolation layer 2 is made of a fabric material, the fabric material is formed by weaving elastic yarns and inelastic yarns, one surface of the elastic isolation layer 2 is connected with the first conductive fabric layer 1 through a three-dimensional weaving process, and the other surface of the elastic isolation layer 2 is connected with the second conductive fabric layer 3 through a three-dimensional weaving process, namely, the elastic isolation layer is formed by weaving on the surface of the conductive fabric layer at one time without attaching an isolation layer additionally.
The elastic isolation layer 2 is an elastic film or fabric material, and the first conductive fabric layer 1 and the second conductive fabric layer 3 are connected to the elastic isolation layer 2 by sewing threads.
The elastic isolation layer 2 is provided with a plurality of through holes 4, and the through holes 4 may be circular, square, linear, or the like. By changing the thickness, the elastic modulus, the number, the size or the position of the through holes 4 of the elastic isolating layer 2; alternatively, the resolution and sensitivity of the resistive flexible fabric position sensor can be adjusted to accommodate different use cases by varying the thickness, size, or conductivity of the conductive coating.
Taking as an example the application of pressure to the surface of the first conductive fabric layer 1, the resistive flexible fabric position sensor of the preferred embodiment of the present invention has the following three forms:
(1) Length for detecting the force application position:
referring to fig. 1 to 3, the resistive flexible fabric position sensor of the present invention adopts a three-layer structure, which includes a first conductive fabric layer 1, an elastic isolation layer 2 and a second conductive fabric layer 3 sequentially disposed from top to bottom.
Wherein the first conductive fabric layer 1 and the second conductive fabric layer 3 are provided with conductive wires 6 for outputting an electrical signal. The first conductive fabric layer 1 and the second conductive fabric layer 3 are all preferably polyester plain weave fabrics, the surfaces of the first conductive fabric layer 1 and the second conductive fabric layer 3 are all coated with conductive coatings, and the conductive coatings are preferably graphene silica gel composite materials. The conductive coating forms a linear plane conductive pattern 7 on the surface of the first conductive fabric layer 1 through a screen printing process, and forms two or more parallel linear plane conductive patterns 7 on the surface of the second conductive fabric layer 3. The first conductive fabric layer 1 and the second conductive fabric layer 3 are bonded with the elastic isolation layer 2 through an adhesive, the elastic isolation layer 2 is preferably warp-knitted elastic knitted fabric woven by polyurethane filaments, and the adhesive is preferably a hot-melt polyurethane film.
The elastic isolation layer 2 is densely provided with a plurality of through holes 4, the first conductive fabric layer 1 or the second conductive fabric layer 3 is provided with contacts 5 matched with the through holes 4, and a space is reserved between the contacts 5 and the second conductive fabric layer 3 or the first conductive fabric layer 1 at the other side; in use, the first conductive fabric layer 1 and the second conductive fabric layer 3 are each connected to a back-end circuit by a conductive wire 6. When pressure is applied to the surface of the first conductive fabric layer 1, the contact 5 is electrified in contact with the second conductive fabric layer 3 on the other side through the through hole 4 and outputs a resistance value corresponding to the applied position, and at this time, the first conductive fabric layer 1, the second conductive fabric layer 3, the conductive wire 6 and the back-end circuit form a loop. Pressure is applied at different positions on the surface of the first conductive fabric layer 1, the output resistance of the sensor changes along with the change of the position where the pressure is applied, and the output resistance is in linear relation with the force application position. By measuring the resistance value, the length of the biasing position can be detected. The theoretical and actual measured curves of the output resistance of a set of samples versus the length measured are given in fig. 6.
(2) Angle amount for detecting position:
referring to fig. 1 and 4, the resistive flexible fabric position sensor of the present invention adopts a three-layer structure, which includes a first conductive fabric layer 1, an elastic isolation layer 2 and a second conductive fabric layer 3 sequentially disposed from top to bottom.
Wherein the first conductive fabric layer 1 and the second conductive fabric layer 3 are provided with conductive wires 6 for outputting an electrical signal. The first conductive fabric layer 1 is preferably polyester plain weave fabric, a conductive coating is coated on the surface of the first conductive fabric layer 1, the conductive coating is preferably graphene silica gel composite material or intrinsic conductive high polymer materials such as polypyrrole, polyacetylene, poly (3, 4-ethylenedioxythiophene) -polystyrene sulfonic acid and the like, and a ratchet-shaped plane conductive pattern 7 is formed on the surface of the first conductive fabric layer 1 through a screen printing process; the second conductive fabric layer 3 is preferably a polyester woven conductive fabric woven from silver-plated fibers. The first conductive fabric layer 1 and the second conductive fabric layer 3 are bonded with the elastic isolation layer 2 through an adhesive, the elastic isolation layer 2 is preferably warp-knitted elastic knitted fabric woven by polyurethane filaments, and the adhesive is preferably a hot-melt polyurethane film.
The elastic isolation layer 2 is densely provided with a plurality of through holes 4, the first conductive fabric layer 1 or the second conductive fabric layer 3 is provided with contacts 5 matched with the through holes 4, and a space is reserved between the contacts 5 and the second conductive fabric layer 3 or the first conductive fabric layer 1 at the other side; in use, the first conductive fabric layer 1 and the second conductive fabric layer 3 are each connected to a back-end circuit by a conductive wire 6. When pressure is applied to the surface of the first conductive fabric layer 1, the contact 5 is electrified in contact with the second conductive fabric layer 3 on the other side through the through hole 4 and outputs a resistance value corresponding to the applied position, and at this time, the first conductive fabric layer 1, the second conductive fabric layer 3, the conductive wire 6 and the back-end circuit form a loop. Pressure is applied at different positions on the surface of the first conductive fabric layer 1, the output resistance of the sensor changes along with the change of the position where the pressure is applied, and the output resistance is in linear relation with the force application position. By measuring the resistance value, the angular amount of the urging position can be detected.
(3) Azimuth information for detecting the force application position:
referring to fig. 1 and 5, the resistive flexible fabric position sensor of the present invention adopts a three-layer structure, which includes a first conductive fabric layer 1, an elastic isolation layer 2 and a second conductive fabric layer 3 sequentially disposed from top to bottom.
Wherein the first conductive fabric layer 1 and the second conductive fabric layer 3 are provided with conductive wires 6 for outputting an electrical signal. The first conductive fabric layer 1 is preferably a conductive fabric layer woven together with an S-shaped roundabout plane conductive pattern by using a jacquard loom for nylon conductive yarns and cotton-polyester blended yarns, and the second conductive fabric layer 3 is preferably a polyester woven conductive fabric woven by copper-nickel-plated fibers. The first conductive fabric layer 1 and the second conductive fabric layer 3 are bonded with the elastic isolation layer 2 through an adhesive, the elastic isolation layer 2 is preferably warp-knitted elastic knitted fabric woven by polyurethane filaments, and the adhesive is preferably styrene block copolymer thermoplastic elasticity.
The elastic isolation layer 2 is densely provided with a plurality of through holes 4, the first conductive fabric layer 1 or the second conductive fabric layer 3 is provided with contacts 5 matched with the through holes 4, and a space is reserved between the contacts 5 and the second conductive fabric layer 3 or the first conductive fabric layer 1 at the other side; in use, the first conductive fabric layer 1 and the second conductive fabric layer 3 are each connected to a back-end circuit by a conductive wire 6. When pressure is applied to the surface of the first conductive fabric layer 1, the contact 5 is electrified in contact with the second conductive fabric layer 3 on the other side through the through hole 4 and outputs a resistance value corresponding to the applied position, and at this time, the first conductive fabric layer 1, the second conductive fabric layer 3, the conductive wire 6 and the back-end circuit form a loop. Pressure is applied at different positions on the surface of the first conductive fabric layer 1, the output resistance of the sensor changes along with the change of the position where the pressure is applied, and the output resistance is in linear relation with the force application position. By measuring the resistance value, the azimuth information (such as the length value, the angular amount, etc.) of the force application position can be detected.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "connected," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and substitutions can be made by those skilled in the art without departing from the technical principles of the present invention, and these modifications and substitutions should also be considered as being within the scope of the present invention.
Claims (7)
1. The resistive flexible fabric position sensor is characterized by comprising a first conductive fabric layer, an elastic isolation layer and a second conductive fabric layer which are sequentially arranged from top to bottom;
the elastic isolation layer is densely provided with a plurality of through holes, the first conductive fabric layer is provided with contacts matched with the through holes, and a space is reserved between the contacts and the second conductive fabric layer at the other side;
the contact is of a convex structure, and can extend into the through hole when pressure is applied to the surface of the first conductive fabric layer;
the first conductive fabric layer and the second conductive fabric layer are respectively provided with a conductive wire for outputting an electric signal, and the first conductive fabric layer and the second conductive fabric layer are respectively connected with a rear-end circuit through the conductive wires;
when pressure is applied to the surface of the first conductive fabric layer, the contact points are electrified in a contact way with the second conductive fabric layer on the other side through the through holes, and the resistance value corresponding to the application position is output;
the first conductive fabric layer, the second conductive fabric layer, the conductive wire and the back-end circuit form a loop;
the surface of the first conductive fabric layer is coated with a conductive coating, and an annular ratchet-shaped plane conductive pattern is formed on the surface of the first conductive fabric layer through a screen printing process;
applying pressure at different positions of the first conductive fabric layer, obtaining a linear function of an output resistor and the first conductive fabric layer by measuring resistance values at corresponding positions, wherein the output resistor of the sensor changes along with the change of the position where the pressure is applied, and the output resistor and the force application position are in a linear relation, and substituting the corresponding resistance values into the related linear function by measuring the corresponding resistance values, so that the angle magnitude of the force application position is obtained.
2. The resistive flexible fabric position sensor of claim 1, wherein the conductive coating is a conductive polymer film.
3. The resistive flexible fabric position sensor of claim 1, wherein the conductive coating is a conductive composite comprising a substrate and conductive particles dispersed within the substrate.
4. The resistive flexible fabric position sensor of claim 1, wherein the elastic isolation layer is an elastic film or fabric material, and the first conductive fabric layer and the second conductive fabric layer are both bonded to the elastic isolation layer by an adhesive.
5. The resistive flexible fabric position sensor of claim 1, wherein the elastic isolation layer is an elastic film, and the elastic film is made of an elastic polymer material;
the elastic isolation layer is directly attached to the first conductive fabric layer through a screen printing, pore plate printing or spraying process, and one surface of the elastic isolation layer, which is far away from the first conductive fabric layer, is bonded with the second conductive fabric layer through an adhesive;
or the elastic isolation layer is directly attached to the second conductive fabric layer through a screen printing, pore plate printing or spraying process, and one surface of the elastic isolation layer, which is far away from the second conductive fabric layer, is bonded with the first conductive fabric layer through an adhesive;
or the elastic isolation layer is directly attached to the first conductive fabric layer and the second conductive fabric layer through a screen printing, pore plate printing or spraying process, and the elastic isolation layer attached to the first conductive fabric layer is bonded with the elastic isolation layer attached to the second conductive fabric layer through an adhesive.
6. The resistive flexible fabric position sensor of claim 1, wherein the elastic isolation layer is a fabric material, the fabric material is woven from elastic yarns and inelastic yarns, one side of the elastic isolation layer is connected to the first conductive fabric layer by a three-dimensional weaving process, and the other side of the elastic isolation layer is connected to the second conductive fabric layer by a three-dimensional weaving process.
7. The resistive flexible fabric position sensor of claim 1, wherein the elastic isolation layer is an elastic film or fabric material, and the first conductive fabric layer and the second conductive fabric layer are connected to the elastic isolation layer by a sewing thread.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211322486.1A CN115638714B (en) | 2022-10-27 | 2022-10-27 | Resistance type flexible fabric position sensor |
| ZA2023/06804A ZA202306804B (en) | 2022-10-27 | 2023-07-04 | A resistive flexible fabric position sensor |
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| CN202211322486.1A CN115638714B (en) | 2022-10-27 | 2022-10-27 | Resistance type flexible fabric position sensor |
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| CN115638714B true CN115638714B (en) | 2024-02-06 |
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| CN115638714A (en) | 2023-01-24 |
| ZA202306804B (en) | 2024-02-28 |
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