CN216954916U - Flexible sensor structure of series connection - Google Patents
Flexible sensor structure of series connection Download PDFInfo
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- CN216954916U CN216954916U CN202220658665.1U CN202220658665U CN216954916U CN 216954916 U CN216954916 U CN 216954916U CN 202220658665 U CN202220658665 U CN 202220658665U CN 216954916 U CN216954916 U CN 216954916U
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Abstract
The utility model relates to a flexible sensor structure connected in series, which comprises a lead film sheet and at least two flexible sensors connected in series, wherein each flexible sensor comprises a piezoelectric block, and two ends of each piezoelectric block are provided with flexible electrodes; one end of the piezoelectric block is connected with one end of the piezoelectric block of the flexible sensor at the rear stage of the piezoelectric block through a connecting flexible film sheet; the piezoelectric blocks of the first-stage flexible sensor and the last-stage flexible sensor are connected with the lead film sheet through the end flexible film sheet; the two flexible electrodes connected with the flexible thin film sheet are connected through a first connecting wire; the lead film sheet is provided with two conductive leads, and the flexible electrode on the end head flexible film sheet is connected with the conductive leads through a second connecting wire. In the utility model, the flexible sensor structure is formed by series connection to detect the pressure value applied in the preset path range, when the sum of the resistances of the piezoelectric blocks is measured, partial test errors of the sensor can be counteracted firstly, the measurement precision is higher, and the application is wide.
Description
Technical Field
The utility model belongs to the technical field of pressure sensors, and particularly relates to a flexible sensor structure connected in series.
Background
With the development of the times, the pressure sensor is applied to the aspects of work and life of people, the requirement of people on pressure monitoring is higher and higher, the pressure sensor is not limited to pressure monitoring on a regular rigid surface, the pressure sensor has various forms, and the common rigid sensor cannot meet the actual requirements of people. The flexible sensor is an electronic device which is prepared by flexible materials and has super-strong environmental adaptability, and can be applied to various fields such as human health monitoring, human motion monitoring, human-computer interaction, soft robot technology and the like. However, the conventional flexible sensor has low measurement accuracy, is generally only used for measuring whether the pressure applied to the sensor changes, cannot accurately measure the magnitude of the applied pressure, and has a large connection error when a plurality of flexible sensors are used for connection in series.
SUMMERY OF THE UTILITY MODEL
In view of this, the present invention aims to provide a series-connected flexible sensor structure with high measurement accuracy.
In order to achieve the purpose, the utility model provides the following technical scheme:
a flexible sensor structure connected in series comprises a lead film sheet and at least two flexible sensors connected in series, wherein each flexible sensor comprises a piezoelectric block, and two ends of each piezoelectric block are respectively provided with a flexible electrode; the flexible electrode is tightly attached to the end face of the piezoelectric block; for the flexible sensor which is not positioned at the last stage of the series structure, one end of the piezoelectric block is connected with one end of the piezoelectric block of the flexible sensor at the next stage of the series structure through a connecting flexible film sheet; for the flexible sensor at the first stage of the series structure and the flexible sensor at the last stage of the series structure, the other end of the piezoelectric block is respectively connected with the lead wire film sheet through a flexible film sheet at one end head; the flexible electrodes are arranged on the connecting flexible thin film sheet or the end head flexible thin film sheet at the corresponding positions, a first connecting wire is arranged on the connecting flexible thin film sheet, and two ends of the first connecting wire are respectively connected with the two flexible electrodes on the connecting flexible thin film sheet; the end head flexible thin film sheet is provided with a second connecting wire, and the second connecting wire is connected with the flexible electrode on the end head flexible thin film sheet; and the two conductive leads are respectively and correspondingly connected with the two second connecting wires and are used for feeding back the sum of the resistance values of all the piezoelectric blocks outwards.
Further, the piezoelectric block is made of ion conductive hydrogel.
Further, the flexible electrode is single-layer graphene or graphite. The single-layer graphene or graphite is used as an electrode, so that ions in the ion-conducting hydrogel can be prevented from reacting with the electrode to influence the measurement accuracy.
Furthermore, the hardness of the connecting flexible thin film sheet and the end flexible thin film sheet is consistent with that of the piezoelectric block.
Furthermore, one end of the lead film sheet is provided with a plug, and the plug is provided with two conductive insertion sheets; each conductive lead is correspondingly connected with a conductive insert.
Further, the lead film sheet, the connecting flexible film sheet and the end flexible film sheet are all covered with insulating layers; the insulating layer covers the first connecting line, the second connecting line and the conductive lead wire, and exposes the flexible electrodes.
Further, the flexible sensors are uniformly arranged along the annular path.
Furthermore, the two flexible thin film sheets of the end head are an integral whole, so that an annular structure is formed.
Furthermore, the piezoelectric blocks are of a cylindrical structure and comprise a first end face facing the inner side of the annular structure and a second end face facing the outer side of the annular structure, and the number of the piezoelectric blocks is even; for the odd-numbered flexible sensors which are not positioned at the last stage of the series structure, the second end surfaces of the piezoelectric blocks are connected with the second end surfaces of the piezoelectric blocks of the flexible sensors at the next stage through a first connecting flexible film sheet; for the even-numbered flexible sensors which are not positioned at the last stage of the series structure, the first end face of the piezoelectric block is connected with the first end face of the piezoelectric block of the flexible sensor at the next stage of the series structure through a second connecting flexible film sheet; for the flexible sensor at the first stage of the series structure and the flexible sensor at the last stage of the series structure, the first end face of the piezoelectric block is respectively connected with the lead wire film sheet through a head flexible film sheet, and the shape of the combined two head flexible film sheets is the same as that of the second connecting flexible film sheet.
Further, the piezoelectric block is of a cylindrical structure and comprises a first end face facing the inner side of the annular structure and a second end face facing the outer side of the annular structure; for the flexible sensor which is not positioned at the last stage of the series structure, the second end face of the piezoelectric block is connected with the first end face of the piezoelectric block of the flexible sensor at the next stage of the series structure through a third connecting flexible film sheet; for the flexible sensor at the first stage of the series structure, the first end face of the piezoelectric block is connected with the lead wire film sheet through the end head flexible film sheet; for the flexible sensor at the last stage of the series structure, the second end face of the piezoelectric block is connected with the lead film piece through the end head flexible film piece, and the shape of the combined end head flexible film piece is the same as that of the third connecting flexible film piece.
According to the utility model, the flexible sensor structure is formed by series connection to detect the pressure value applied in the preset path range, when the sum of the resistances of the piezoelectric blocks is measured, partial test errors of the sensor can be counteracted firstly, and the measurement precision is higher; moreover, the flexible sensor structure after the series connection only has two leads, can insert measuring circuit as a flexible sensor and measure, compare in respectively measuring through a plurality of flexible sensors, required measuring circuit structure is simpler. When the serial connection forms a ring structure, the sensor can also be used as a ring sensor for measurement. In addition, the piezoelectric block is made of the ionic conductive hydrogel, so that the piezoelectric block is more sensitive to pressure detection, has high sensitivity and can accurately measure the pressure value applied to the sensor. The practicability is strong and the application is wide.
Drawings
For the purposes of promoting a better understanding of the objects, aspects and advantages of the utility model, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic diagram of a preferred embodiment of a series-connected flexible sensor structure according to the present invention.
Fig. 2 is an exploded view of fig. 1.
Fig. 3 is a schematic structural diagram of a flexible sensor structure provided with two piezoelectric blocks.
Fig. 4 is a schematic structural diagram of a flexible sensor structure adopting a second connection mode when the end surfaces of the piezoelectric blocks are connected by connecting flexible thin film pieces.
11. The flexible film comprises a first connecting flexible film sheet, 12 a second connecting flexible film sheet, 13 a third connecting flexible film sheet, 14 a terminal flexible film sheet, 15 a lead film sheet, 16 an insulating layer, 17 a plug, 20 a piezoelectric block, 21 a first end face, 22 a second end face, 31 a first connecting wire, 32 a second connecting wire, 33 a flexible electrode, 34 a conductive lead and 35 a conductive inserting sheet.
Detailed Description
The embodiments of the utility model are explained below by means of specific examples, the illustrations provided in the following examples are merely illustrative of the basic idea of the utility model, and features in the following examples and examples can be combined with one another without conflict.
As shown in fig. 1 and 2, a preferred embodiment of a series-connected flexible sensor structure of the present invention comprises a lead film sheet 15 and at least two flexible sensors connected in series; the structure formed by connecting the flexible sensors in series can be annular or in other shapes; the present embodiment is illustrated by way of example in which the flexible sensors are arranged uniformly along a circular path, thereby forming a circular structure in series. Each flexible sensor comprises a piezoelectric block 18, the piezoelectric block 18 is made of ion conductive hydrogel, the ion conductive hydrogel is made of soft conductive materials with contractive elasticity and corresponding resistance values and shape changes, and the resistance values of the ion conductive hydrogel change correspondingly after deformation under the action of pressure; and the deformation of the ion conductive hydrogel has stronger relevance with the change of the resistance value of the ion conductive hydrogel, and is convenient for accurately measuring the pressure value of the flexible sensor.
Two ends of each piezoelectric block 18 are respectively provided with a flexible electrode 33; the flexible electrode 33 is preferably single-layer graphene, but may also be graphite; so as to avoid the reaction between the ions in the ion conductive hydrogel and the electrode and influence the measurement precision. The hardness of the connecting flexible thin film sheet and the flexible thin film sheet at the end head 14 is preferably consistent with that of the piezoelectric block 18, so that the flexible thin film sheet and the piezoelectric block 18 are synchronously deformed when the flexible sensor is pressed, and the measurement accuracy is improved.
The flexible electrode 33 is closely attached to the end face of the piezoelectric block 18, and preferably, the end face of the piezoelectric block 18 is bonded and fixed to the flexible electrode 33 by using a conductive adhesive. The piezoelectric block 18 is preferably a cylindrical structure (e.g., a cylindrical structure) including a first end face 21 facing the inside of the annular structure and a second end face 22 facing the outside of the annular structure. The piezoelectric block 18 adopts a cylindrical structure, so that two end faces are attached to the flexible electrode 33 conveniently; for a flexible sensor not located at the last stage of the series structure, one end (i.e., one end face) of the piezoelectric block 18 is connected with one end (i.e., one end face) of the piezoelectric block 18 of the flexible sensor at the next stage through a connecting flexible thin film sheet; for the flexible sensor located at the first stage of the series structure and the flexible sensor located at the last stage of the series structure, the other end (i.e., the other end face) of the piezoelectric block 18 is connected to the lead film piece 15 through one end head flexible film piece 14, respectively. The two flexible thin film sheets 14 of the end head are an integral whole body, so as to form a ring-shaped structure; of course, when the shape after the serial connection is not a ring structure, the two flexible thin film pieces 14 of the end head can also be two independent flexible thin film pieces.
The flexible electrode 33 is arranged on the connecting flexible thin film sheet or the end head flexible thin film sheet 14 at the corresponding position, a first connecting line 31 is arranged on the connecting flexible thin film sheet, and two ends of the first connecting line 31 are respectively connected with the two flexible electrodes 33 on the connecting flexible thin film sheet; a second connecting line 32 is arranged on the end flexible thin film sheet 14, and the second connecting line 32 is connected with a flexible electrode 33 on the end flexible thin film sheet 14; the lead film sheet 15 is provided with two conductive leads 34, the two conductive leads 34 are respectively connected with the two second connection lines 32, and the two conductive leads 34 are used for feeding back the sum of the resistance values of all the piezoelectric blocks 18. In order to connect the flexible sensor into a circuit, a plug 17 can be arranged at one end of the lead film sheet 15, and two conductive insertion sheets 35 are arranged on the plug 17; each of the conductive leads 34 is correspondingly connected to a conductive insert 35.
In order to protect the first connecting line 31, the second connecting line 32, the conductive lead 34 and other conductive connecting lines, the insulating layer 16 is preferably covered on the lead film sheet 15, the connecting flexible film sheet and the tip flexible film sheet 14; the insulating layer 16 connecting the flexible thin film sheet and the flexible thin film sheet 14 covers the first connecting line 31 and the second connecting line 32, and the flexible electrode 33 is exposed; the insulating layer 16 of the lead film sheet 15 covers the leads of the conductive leads 34 and exposes the conductive insert 35.
The end faces of the adjacent piezoelectric blocks 18 are connected in two connection modes through connecting flexible thin film pieces.
In the first connection mode, the number of the piezoelectric blocks 18 is even; for example: two (as shown in fig. 3) or four (as shown in fig. 1); of course, the number of piezoelectric blocks 18 may be other even numbers. At this time, for the odd-numbered flexible sensors not located at the last stage of the series structure, the second end face 22 of the piezoelectric block 18 is connected with the second end face 22 of the piezoelectric block 18 of the flexible sensor at the next stage through a first connecting flexible film sheet 11; for the even-numbered flexible sensors which are not positioned at the last stage of the series structure, the first end face 21 of the piezoelectric block 18 is connected with the first end face 21 of the piezoelectric block 18 of the flexible sensor at the next stage through a second connecting flexible film piece 12; for the flexible sensor at the first stage of the series structure and the flexible sensor at the last stage of the series structure, the first end face 21 of the piezoelectric block 18 is respectively connected with the lead film piece 15 through a head flexible film piece 14, and the shape formed by combining the two head flexible film pieces 14 is the same as that of the second connecting flexible film piece 12. For example: as shown in fig. 1, when the number of the piezoelectric blocks 18 is four, the second end face 22 of the piezoelectric block 18 of the first-stage flexible sensor is connected with the second end face 22 of the piezoelectric block 18 of the second-stage flexible sensor through a first connecting flexible thin film sheet 11; the first end face 21 of the piezoelectric block 18 of the second-stage flexible sensor is connected with the first end face 21 of the piezoelectric block 18 of the third-stage flexible sensor through a second connecting flexible thin film sheet 12; the second end face 22 of the piezoelectric block 18 of the third-level flexible sensor is connected with the second end face 22 of the piezoelectric block 18 of the fourth-level flexible sensor through a first connecting flexible thin film sheet 11; the first end face 21 of the piezoelectric block 18 of the fourth stage flexible sensor is connected with the first end face 21 of the piezoelectric block 18 of the first stage flexible sensor through an integral whole formed by combining the two end flexible film sheets 14.
In the second connection mode, the number of the piezoelectric blocks 18 may be an odd number or an even number. As shown in fig. 4, in this case, for the flexible sensor not located at the last stage of the series structure, the second end surface 22 of the piezoelectric block 18 is connected to the first end surface 21 of the piezoelectric block 18 of the flexible sensor at the next stage thereof through a third connecting flexible film 13; for the flexible sensor at the first stage of the series structure, the first end face 21 of the piezoelectric block 18 is connected with the lead film piece 15 through the end flexible film piece 14; for the flexible sensor at the last stage of the series structure, the second end face 22 of the piezoelectric block 18 is connected with the lead film piece 15 through the end flexible film piece 14, and the combined shape of the two end flexible film pieces 14 is the same as that of the third connecting flexible film piece 13. For example: as shown in fig. 4, when the number of the piezoelectric blocks 18 is four, the second end surface 22 of the piezoelectric block 18 of the first-stage flexible sensor is connected with the first end surface 21 of the piezoelectric block 18 of the second-stage flexible sensor through a first connecting flexible film 11; the second end face 22 of the piezoelectric block 18 of the second-stage flexible sensor is connected with the first end face 21 of the piezoelectric block 18 of the third-stage flexible sensor through a second connecting flexible thin film sheet 12; the second end face 22 of the piezoelectric block 18 of the third-stage flexible sensor is connected with the second end face 22 of the piezoelectric block 18 of the first-stage flexible sensor through a first connecting flexible thin film sheet 11; the second end face 22 of the piezoelectric block 18 of the fourth-stage flexible sensor is connected with the first end face 21 of the piezoelectric block 18 of the first-stage flexible sensor through an integral whole formed by combining the two end flexible film sheets 14.
In the embodiment, the flexible sensor structure is formed by connecting in series to detect the pressure value applied in the predetermined path range, so that when the sum of the resistances of the piezoelectric blocks 18 is measured, part of the test errors of the sensors can be offset first, and the measurement precision is higher; moreover, the flexible sensor structure after the series connection only has two leads, can insert measuring circuit as a flexible sensor and measure, compare in respectively measuring through a plurality of flexible sensors, required measuring circuit structure is simpler. In addition, when the serial connection forms a ring structure, the ring structure can also be used as a ring sensor for measurement, for example, the ring structure can be arranged on the outer surface of a ring object to form a hand-grasping device for measuring the pressure applied when a hand holds the ring object.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (10)
1. A flexible sensor structure connected in series is characterized by comprising a lead film sheet and at least two flexible sensors connected in series, wherein each flexible sensor comprises a piezoelectric block, and two ends of each piezoelectric block are respectively provided with a flexible electrode; the flexible electrode is tightly attached to the end face of the piezoelectric block; for the flexible sensor which is not positioned at the last stage of the series structure, one end of the piezoelectric block is connected with one end of the piezoelectric block of the flexible sensor at the next stage of the series structure through a connecting flexible film sheet; for the flexible sensor at the first stage of the series structure and the flexible sensor at the last stage of the series structure, the other end of the piezoelectric block is respectively connected with the lead wire film sheet through a flexible film sheet at one end head; the flexible electrodes are arranged on the connecting flexible thin film sheet or the end head flexible thin film sheet at the corresponding positions, a first connecting wire is arranged on the connecting flexible thin film sheet, and two ends of the first connecting wire are respectively connected with the two flexible electrodes on the connecting flexible thin film sheet; the end head flexible thin film sheet is provided with a second connecting wire, and the second connecting wire is connected with the flexible electrode on the end head flexible thin film sheet; and the two conductive leads are respectively and correspondingly connected with the two second connecting wires and are used for feeding back the sum of the resistance values of all the piezoelectric blocks outwards.
2. A series-connected flexible sensor structure as claimed in claim 1, wherein said piezoelectric stack is formed using an ionically conductive hydrogel.
3. A series-connected flexible sensor structure according to claim 1, wherein said flexible electrode is single-layer graphene or graphite.
4. A series-connected flexible sensor structure according to claim 1, wherein the stiffness of said connecting flexible membrane sheet and said tip flexible membrane sheet is the same as the stiffness of said piezoelectric stack.
5. A series-connected flexible sensor structure according to claim 1, wherein one end of said lead film sheet is provided with a plug, and said plug is provided with two conductive tabs; each conductive lead is correspondingly connected with a conductive insert.
6. A series connected flexible sensor structure according to claim 1, wherein said lead film, connection flexible film and tip flexible film are covered with an insulating layer; the insulating layer covers the first connecting line, the second connecting line and the conductive lead wire, and exposes the flexible electrodes.
7. A series-connected flexible sensor structure according to any of claims 1 to 6, wherein the flexible sensors are arranged uniformly along a circular path.
8. A series-connected flexible sensor structure as claimed in claim 7 wherein said two pieces of tip flexible membrane are an integral piece forming an annular structure.
9. A series-connected flexible sensor structure according to claim 8, wherein the piezoelectric blocks are cylindrical structures comprising a first end surface facing the inside of the annular structure and a second end surface facing the outside of the annular structure, and the number of piezoelectric blocks is even; for the odd-numbered flexible sensors which are not positioned at the last stage of the series structure, the second end surfaces of the piezoelectric blocks are connected with the second end surfaces of the piezoelectric blocks of the flexible sensors at the next stage through a first connecting flexible film sheet; for the even-numbered flexible sensors which are not positioned at the last stage of the series structure, the first end face of the piezoelectric block is connected with the first end face of the piezoelectric block of the flexible sensor at the next stage of the series structure through a second connecting flexible film sheet; for the flexible sensor at the first stage of the series structure and the flexible sensor at the last stage of the series structure, the first end face of the piezoelectric block is respectively connected with the lead wire film sheet through a head flexible film sheet, and the shape of the combined two head flexible film sheets is the same as that of the second connecting flexible film sheet.
10. A series-connected flexible sensor structure according to claim 8, wherein the piezoelectric stack is a cylindrical structure comprising a first end face facing inside the annular structure and a second end face facing outside the annular structure; for the flexible sensor which is not positioned at the last stage of the series structure, the second end face of the piezoelectric block is connected with the first end face of the piezoelectric block of the flexible sensor at the next stage of the series structure through a third connecting flexible film sheet; for the flexible sensor at the first stage of the series structure, the first end face of the piezoelectric block is connected with the lead wire film sheet through the end head flexible film sheet; for the flexible sensor at the last stage of the series structure, the second end face of the piezoelectric block is connected with the lead film piece through the end head flexible film piece, and the shape of the combined end head flexible film piece is the same as that of the third connecting flexible film piece.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220658665.1U CN216954916U (en) | 2022-03-24 | 2022-03-24 | Flexible sensor structure of series connection |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220658665.1U CN216954916U (en) | 2022-03-24 | 2022-03-24 | Flexible sensor structure of series connection |
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| CN216954916U true CN216954916U (en) | 2022-07-12 |
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| CN202220658665.1U Active CN216954916U (en) | 2022-03-24 | 2022-03-24 | Flexible sensor structure of series connection |
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