CN220418696U - Flexible pressure sensor - Google Patents

Abstract

The utility model discloses a flexible pressure sensor, which comprises a first conductive layer, a second conductive layer and an isolation layer arranged between the first conductive layer and the second conductive layer, wherein the first conductive layer comprises a first base material and a plurality of first induction parts arranged on the first base material, the second conductive layer comprises a second base material and a plurality of second induction parts arranged on the second base material, each first induction part is opposite to one second induction part, the first base material is provided with a plurality of first hollowed-out holes, and the first hollowed-out holes are distributed among the first induction parts; and/or, the second substrate is provided with a plurality of second hollowed holes, and the second hollowed holes are distributed among the second sensing parts.

Description

Flexible pressure sensor

Technical Field

The utility model relates to the technical field of pressure sensors, in particular to a flexible pressure sensor.

Background

The pressure sensor consists of a substrate with an electrode and a conductive film, wherein the electrode is spaced from the conductive film in a non-stressed state and is in an off state; under the stress state, the conductive film is pressed and deformed to be in contact conduction with the electrode, and along with the increase of the contact area of the conductive film and the electrode, the current between the conductive film and the electrode is increased, so that the output resistance of the sensor is changed, and the relation between the pressure and the output resistance is obtained.

With the development of pressure sensors, the application of the pressure sensors is wider and wider, and the requirements on performances in all aspects are higher and higher. When applied to structures such as mattresses, cushions, and the like, there is a higher demand for deformability to avoid damage during stretching or bending, and existing structural pressure sensors are difficult to meet such use requirements.

Disclosure of Invention

In view of this, it is an object of the present application to provide a flexible pressure sensor with good deformability.

The flexible pressure sensor comprises a first conductive layer, a second conductive layer and an isolation layer arranged between the first conductive layer and the second conductive layer, wherein the first conductive layer comprises a first base material and a plurality of first induction parts arranged on the first base material, the second conductive layer comprises a second base material and a plurality of second induction parts arranged on the second base material, each first induction part is opposite to one second induction part, the first base material is provided with a plurality of first hollowed-out holes, and the first hollowed-out holes are distributed among the first induction parts; and/or, the second substrate is provided with a plurality of second hollowed-out holes, and the second hollowed-out holes are distributed among the second sensing parts.

Compared with the prior art, the flexible pressure sensor provided by the utility model has the advantages that the hollow holes are formed in the first substrate and the second substrate in an ascending manner, the flexible pressure sensor has better deformability as a whole, is not easy to damage when being stretched or bent under stress, and is particularly used in products such as cushions, mattresses and the like.

Drawings

FIG. 1 is a schematic view of an embodiment of a flexible sensor of the present utility model.

Fig. 2 is an exploded view of the flexible sensor shown in fig. 1.

Fig. 3 is a further exploded view of the first conductive layer of fig. 2.

Fig. 4 is a further exploded view of the second conductive layer of fig. 2.

Detailed Description

In order to facilitate an understanding of the present application, a more complete description of the present application will now be provided with reference to the relevant figures. One or more embodiments of the present application are schematically illustrated in the drawings so that the present disclosure may be more accurately and thoroughly understood. It should be understood, however, that this application may be embodied in many different forms and should not be construed as limited to the specific embodiments set forth herein.

The same or similar reference numbers in the drawings of the present application correspond to the same or similar components; in the description of the present application, it should be understood that, if there are terms such as "upper", "lower", "left", "right", "front", "rear", "inner", "outer", "longitudinal", "transverse", "axial", "radial", "circumferential", etc., the indicated azimuth or positional relationship is based on the azimuth or positional relationship shown in the drawings, only for convenience of description and simplification of the description, but does not indicate or imply that the indicated apparatus or element must have a specific azimuth, be constructed and operated in a specific azimuth, so that the terms describing the positional relationship in the description are merely for exemplary illustration and not to be construed as limitations of the present application, and that the specific meaning of the above terms may be understood by those of ordinary skill in the art according to specific circumstances.

Unless defined otherwise, technical and scientific terms used in the specification of this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. Technical and scientific terms used in this specification are used solely to describe specific embodiments and are not intended to limit the application.

Fig. 1-2 illustrate an embodiment of the flexible pressure sensor of the present utility model, which is generally a multi-layered sheet structure, including a first conductive layer 10, a second conductive layer 20, and a separator layer 30 disposed between the first conductive layer 10 and the second conductive layer 20.

Referring to fig. 3, the first conductive layer 10 includes a first substrate 12, a first circuit structure 14 and a first sensing structure 16 formed on the first substrate 12. The first substrate 12 is a sheet-like structure, preferably a flexible film material such as PET, TPU, PVC, and has good printing adhesion and good resilience, and can generate corresponding deformation when being pressed and can quickly recover the deformation when not being pressed. The first circuit structure 14 is preferably a conductive silver paste circuit formed on the surface of the first substrate 12 by printing, etching, plating, spraying, or the like. The first sensing structure 16 is preferably a high resistance carbon oil formed on the first circuit structure 14 by a screen printing process or the like.

The first circuit structure 14 includes a plurality of first conductive traces 141 arranged at intervals along the first direction, and preferably, the plurality of first conductive traces 141 are arranged at intervals in parallel. Each of the first conductive traces 141 extends along a second direction, specifically, the first direction may be a width direction of the first substrate 12, and the second direction may be a length direction of the first substrate 12, which are preferably perpendicular to each other. The end of each first conductive line 141 extends outwards to form a first lead 143, and in this embodiment, the end of each first lead 143 is bent and then extends along a first direction to form a first lead interface 145 for connecting to an external circuit.

In this embodiment, the middle of one side of the first substrate 12 is bent and extended outwards to form the first lead position 121, the first lead position 121 is in a strip structure, and the first leads 143 are closely arranged on the first lead position 121. After the flexible pressure sensor is mounted on products such as mattresses, cushions and the like, the first lead position 121 with the narrow length can conveniently penetrate outwards, so that connection with other electronic devices is facilitated.

The first conductive traces 141 are provided with a plurality of first sensing points 147 at intervals, and the first sensing points 147 are distributed on the first substrate 12 in a rectangular array shape as a whole. The first sensing structure 16 includes a plurality of first sensing portions 161 arranged in a rectangular array, the number and arrangement of the first sensing portions 161 are the same as those of the first sensing points 147, and each first sensing portion 161 covers one of the first sensing points 147. In the illustrated embodiment, the first sensing point 147 and the first sensing portion 161 have a small circular structure, wherein the size (e.g., diameter, etc.) of the first sensing portion 161 is not smaller than the size of the first sensing point 147, so that the first sensing portion 161 can completely cover the first sensing point 147. In other embodiments, the first sensing portion 161 may have other shapes, such as square, oval, irregular, etc.

The first substrate 12 has a solid structure at the positions corresponding to the first circuit structures 14 and the first sensing structures 16 and has a hollow structure at the positions corresponding to the first conductive circuits 141, so that the deformation capability of the first conductive layer 10 on the whole is improved, and the first substrate has good stretching ductility, bending flexibility and wrinkle resistance, and is not easy to damage when being deformed under pressure. Specifically, the first substrate 12 is provided with a plurality of first hollow holes 123, the first hollow holes 123 are arranged in a rectangular array, the number of rows and the number of columns of the first hollow holes are reduced by one relative to the number of columns of the first sensing portions 161, if the first sensing portions 161 are N rows and M columns, the first sensing portions 161 are N-1 rows and M-1 columns, and N, M is an integer not lower than 3, and the two may be equal or unequal. Thus, each first hollow hole 123 is located between two adjacent rows of first sensing portions 161 and two adjacent columns of first sensing portions 161, that is, 4 first sensing portions 161 surround each first hollow hole 123.

In this embodiment, the first conductive line 141 is a wavy line structure that is bent and extended, and is not easy to damage when the first substrate 12 is stretched. The first hollowed holes 123 are irregularly shaped, and the upper and lower sides of each first hollowed hole 123 extend to the bent positions of two adjacent first conductive lines 141 respectively, so as to increase the hollowed area of the first substrate 12 as much as possible. Preferably, the first substrate 12 is further provided with a plurality of first perforations 125, the first perforations 125 being arranged along each side edge of the first substrate 12 to promote deformability at the edge position of the first substrate 12. Specifically, in the outermost row or column of the first sensing parts 161, one first perforation 125 is provided between any adjacent two of the first sensing parts 161.

Referring to fig. 4, the second conductive layer 20 is similar to the first conductive layer 10 in structure, and includes a second substrate 22, and a second circuit structure 24 and a second sensing structure 26 formed on the second substrate 22. The second substrate 22 is a laminar structure, preferably of a flexible film material such as PET, TPU, PVC. The second wiring structure 24 is preferably a conductive silver paste wiring formed on the surface of the second substrate 22 by printing, etching, plating, spraying, or the like. The second sensing structure 26 is preferably a high resistance carbon oil formed on the second circuit structure 24 by a screen printing process or the like.

The second circuit structure 24 includes a plurality of second conductive traces 241, each second conductive trace 241 extends along a first direction, and the plurality of second conductive traces 241 are spaced apart along a second direction. The end of each second conductive trace 241 extends outward to form a second lead 243, and the end of each second lead 243 is bent and then extends along the first direction to form a second lead interface 245. The middle part of the side edge of the second substrate 22 is bent outwards to form a second lead position 221, and the second lead 243 is closely arranged on the second lead position 221. The second lead 221 is also elongated and preferably positioned opposite the first lead 121 so as to be easily accessible for connection to other electronic devices.

A plurality of second sensing points 247 are disposed on each second conductive trace 241 at intervals, and the second sensing points 247 are distributed on the second substrate 22 in a rectangular array shape as a whole. The second sensing structures 26 include a plurality of second sensing portions 261 arranged in a rectangular array, the number and arrangement manner of the second sensing portions 261 are the same as those of the second sensing points 247, and each second sensing portion 261 covers one of the second sensing points 247. The size of the second sensing part 261 is not smaller than the size of the second sensing spot 247, so that the second sensing part 261 can completely cover the second spot. Each second sensing part 261 is opposite to one first sensing part 161, and the two sensing parts together form a sensing unit.

The second substrate 22 has a solid structure at the positions corresponding to the second circuit structures 24 and the second sensing structures 26 and has a hollow structure at the positions corresponding to the second conductive circuits 241, so that the deformation capability of the second conductive layer 20 on the whole is improved, and the second substrate has good stretching ductility, bending flexibility and wrinkle resistance, and is not easy to damage when being deformed under pressure. Specifically, the second substrate 22 is provided with a plurality of second hollow holes 223, the second hollow holes 223 are arranged in a rectangular array, and the number of rows and the number of columns of the second hollow holes 223 are reduced by one relative to the second sensing portion 261. Thus, each second hollow hole 223 is located between two adjacent rows of second sensing portions 261 and two adjacent columns of second sensing portions 261, that is, 4 second sensing portions 261 are surrounded around each second hollow hole 223.

In this embodiment, the second conductive trace 241 is a wavy line structure that is bent and extended, and is not easy to damage when the second substrate 22 is stretched. The upper and lower sides of each second hollowed-out hole 223 extend to the bent parts of two adjacent second conductive lines 241 respectively, so as to increase the hollowed-out area as much as possible. The second hollowed-out hole 223 may be the same as or different from the first hollowed-out hole 221. Preferably, the second substrate 22 is further provided with a plurality of second perforations 225, the second perforations 225 being arranged along each side edge of the second substrate 22, increasing the deformability at the edge location of the second substrate 22. The second perforations 225 may be the same as or different from the first perforations 125.

When assembled, the first sensing structure 16 of the first conductive layer 10 and the second sensing structure 26 of the second conductive layer 20 are opposite to each other, the first conductive line 141 and the second conductive line 241 are perpendicular, and each first sensing portion 161 faces one of the second sensing portions 261. The spacer layer 30 is interposed between the first substrate 12 and the second substrate 22 to separate the first sensing portion 161 and the second sensing portion 261 which are opposite to each other. The release layer 30 is preferably a pressure sensitive double sided adhesive, a printing double sided adhesive, or the like, that adheres the first substrate 12, the second substrate 22 together. The isolation layer 30 is provided with a through hole 32 at a position corresponding to each first sensing part 161 and/or each second sensing part 261, and the size of the through hole 32 is not smaller than that of the first sensing part 161 and/or the second sensing part 261, so that the first sensing part 161 and the second sensing part 261 of the flexible pressure sensor can be completely contacted when the flexible pressure sensor is deformed under pressure.

When the first substrate 12 and the second substrate 22 are adhered together by the isolation layer 30, the first hollow holes 123 are opposite to the second hollow holes 223 of the second substrate 22, and the first through holes 125 are opposite to the second through holes 225. The isolation layer 30 is provided with the third hollowed-out hole 34 at the position corresponding to the first hollowed-out hole 123 and/or the second hollowed-out hole 223, and is provided with the third hollowed-out hole 36 at the position corresponding to the first perforated hole 125 and/or the second perforated hole 225, so that the whole flexible pressure sensor is of a hollowed-out structure, has excellent stretching ductility, bending flexibility and wrinkle resistance, and can be well adapted even if being applied to products with larger compression deformation such as mattresses, cushions and the like. Moreover, the first conductive line 141 and the second conductive line 241 are bent and extended, which provides a possibility of stretching and extending the sensor to a large extent, and meets the use requirement of complex application environment.

In the flexible pressure sensor, under the normal state, the first circuit structure 14 and the second circuit structure 24 are in a separated state under the action of the isolating layer 30, the first sensing part 161 and the second sensing part 261 are in an open state, and the resistance between the first sensing part and the second sensing part is large in a wireless manner. When an external force acts, the first conductive layer 10 and/or the second conductive layer 20 is pressed and deformed to make the first sensing portion 161 and the second sensing portion 261 contact and conduct, and as the contact area of the first sensing portion and the second sensing portion continuously increases, the output resistance gradually decreases, so that the relation between pressure and resistance can be obtained, and the pressure sensing function is realized. The first lead wire position 121 and the second lead wire position 221 of the flexible pressure sensor are long, are very suitable for being arranged in a cushion, and are led out outwards to be connected with other electronic devices so as to output a resistor, and are more convenient to use.

It should be noted that the present utility model is not limited to the above embodiments, and those skilled in the art can make other changes according to the inventive spirit of the present utility model, and these changes according to the inventive spirit of the present utility model should be included in the scope of the present utility model as claimed.

Claims (10)

1. A flexible pressure sensor comprising a first conductive layer, a second conductive layer, and an isolation layer disposed between the first conductive layer and the second conductive layer, characterized in that,

the first conductive layer comprises a first base material and a plurality of first induction parts arranged on the first base material, the second conductive layer comprises a second base material and a plurality of second induction parts arranged on the second base material, each first induction part is opposite to one second induction part,

the first substrate is provided with a plurality of first hollowed-out holes, and the first hollowed-out holes are distributed among the first sensing parts; and/or, the second substrate is provided with a plurality of second hollowed-out holes, and the second hollowed-out holes are distributed among the second sensing parts.

2. The flexible pressure sensor of claim 1, wherein,

the first induction parts and the first hollowed holes are rectangular arrays, and each first hollowed hole is positioned between two adjacent rows of first induction parts and two adjacent columns of first induction parts; and/or the number of the groups of groups,

the second induction parts and the second hollowed holes are rectangular arrays, and each second hollowed hole is positioned between two adjacent rows of second induction parts and two adjacent columns of second induction parts.

3. A flexible pressure sensor as set forth in claim 2, wherein,

a plurality of first conductive circuits are arranged on the first substrate, the first conductive circuits are arranged at intervals along a first direction, each first conductive circuit extends along a second direction,

and a plurality of first induction points are arranged on each first conductive circuit at intervals, and each row of first induction parts covers all first induction points of one first conductive circuit.

4. A flexible pressure sensor as set forth in claim 3, wherein,

each first conductive line is bent and extended to be in a wavy line shape.

5. A flexible pressure sensor as set forth in claim 3, wherein,

a plurality of second conductive circuits are arranged on the second substrate, the second conductive circuits are arranged at intervals along the second direction, each second conductive circuit extends along the first bending to form a wavy line,

and a plurality of second induction points are arranged on each second conductive circuit at intervals, and each row of second induction parts covers all second induction points of one second conductive circuit.

6. The flexible pressure sensor of claim 5, wherein,

the first substrate is outwards extended with a strip-shaped first lead position, and the first conductive circuit extends to the first lead position to form a first lead interface;

the second substrate is outwardly extended with a strip-shaped second lead position, and the second conductive circuit is extended to the second lead position to form a second lead interface.

7. The flexible pressure sensor of claim 4, wherein,

the first hollowed-out holes are irregularly shaped and extend to the bent parts of two adjacent first conductive circuits.

8. The flexible pressure sensor of claim 1, wherein,

the isolating layer is provided with through holes corresponding to the first sensing part and the second sensing part, and the size of the through holes is not smaller than that of the first sensing part and the second sensing part.

9. A flexible pressure sensor as claimed in any one of claims 1-8, characterized in that,

the edge of the first substrate is provided with a plurality of first perforations; and/or a plurality of second perforations are arranged at the edge of the second base material,

the edge of the isolating layer is provided with a third perforation corresponding to the first perforation and/or the second perforation.

10. A flexible pressure sensor as claimed in any one of claims 1-8, characterized in that,

the isolation layer is provided with a third hollow hole corresponding to the first hollow hole and/or the second hollow hole.