CN116337289A - Flexible pressure sensor, manufacturing method of flexible pressure sensor and electronic equipment - Google Patents
Flexible pressure sensor, manufacturing method of flexible pressure sensor and electronic equipment Download PDFInfo
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- CN116337289A CN116337289A CN202310297186.0A CN202310297186A CN116337289A CN 116337289 A CN116337289 A CN 116337289A CN 202310297186 A CN202310297186 A CN 202310297186A CN 116337289 A CN116337289 A CN 116337289A
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- 238000000034 method Methods 0.000 claims description 33
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
- G01L1/22—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04B—KNITTING
- D04B1/00—Weft knitting processes for the production of fabrics or articles not dependent on the use of particular machines; Fabrics or articles defined by such processes
- D04B1/14—Other fabrics or articles characterised primarily by the use of particular thread materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
- G01L9/02—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means by making use of variations in ohmic resistance, e.g. of potentiometers, electric circuits therefor, e.g. bridges, amplifiers or signal conditioning
- G01L9/04—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means by making use of variations in ohmic resistance, e.g. of potentiometers, electric circuits therefor, e.g. bridges, amplifiers or signal conditioning of resistance-strain gauges
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- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2401/00—Physical properties
- D10B2401/16—Physical properties antistatic; conductive
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
The application discloses a flexible pressure sensor, a manufacturing method of the flexible pressure sensor and electronic equipment, wherein the flexible pressure sensor comprises a flexible force-sensitive sensing layer, a force-sensitive detection point layer and a conductive lead, the flexible force-sensitive sensing layer is formed by weaving conductive yarns, the force-sensitive detection point layer is arranged above the flexible force-sensitive sensing layer, and the conductive lead is respectively connected with the flexible force-sensitive sensing layer and the force-sensitive detection point layer. Based on the flexible pressure sensor provided by the application, the force-sensitive detection point layer is arranged above the flexible force-sensitive sensing layer, so that the heights of the flexible force-sensitive sensing layer and the force-sensitive detection point layer are different, the maximum pressure deformation value and the conductive path of the flexible pressure sensor are increased, and compared with the technical scheme that the conductive material and the flexible substrate are combined in a mode of poor uniformity such as coating or etching in the related art, the sensitivity of the flexible pressure sensor can be effectively improved.
Description
Technical Field
The present disclosure relates to the field of sensor technologies, and in particular, to a flexible pressure sensor, a method for manufacturing the flexible pressure sensor, and an electronic device.
Background
The flexible pressure sensor is widely applied to the fields of medical health, sports and leisure, intelligent manufacturing, aerospace and the like, and health monitoring, motion monitoring, man-machine interaction and the like are realized through the flexible pressure sensor. The traditional flexible pressure sensor is mostly made of components, and the hardness of the components is large and the components are not easy to bend, so that the comfort level of the traditional flexible pressure sensor is low. In the related art, a coating or etching mode is adopted to combine the conductive material with the flexible substrate, but the mode cannot ensure the uniformity of the combination of the conductive material and the flexible substrate, so that the sensitivity of the flexible pressure sensor is low.
Disclosure of Invention
The embodiment of the application provides a flexible pressure sensor, a manufacturing method of the flexible pressure sensor and electronic equipment, and the sensitivity of the flexible pressure sensor can be effectively improved.
In a first aspect, embodiments of the present application provide a flexible pressure sensor, comprising:
the flexible force-sensitive sensing layer is formed by weaving conductive yarns;
the force-sensitive detection point layer is formed by weaving the conductive yarns, and is arranged above the flexible force-sensitive sensing layer;
and the conductive leads are respectively connected with the flexible force-sensitive sensing layer and the force-sensitive detection point layer.
The flexible pressure sensor according to the embodiment of the first aspect of the application has at least the following beneficial effects: a flexible pressure sensor comprising: the flexible pressure sensor comprises a flexible force-sensitive sensing layer, a force-sensitive detection point layer and a conductive lead, wherein the flexible force-sensitive sensing layer and the force-sensitive detection point layer are woven by conductive yarns, so that the flexible pressure sensor has good ductility and rebound resilience, the comfort level of the flexible pressure sensor can be effectively improved, the force-sensitive detection point layer is arranged above the flexible force-sensitive sensing layer, the conductive lead is respectively connected with the flexible force-sensitive sensing layer and the force-sensitive detection point layer, the heights of the flexible force-sensitive sensing layer and the force-sensitive detection point layer are different, the force-sensitive detection point layer and the flexible force-sensitive sensing layer are sequentially deformed under the action of the pressure, the maximum pressure deformation value of the flexible pressure sensor can be increased, the conductive path is increased, and the sensitivity of the flexible pressure sensor can be effectively improved. Based on the flexible pressure sensor provided by the application, the force-sensitive detection point layer is arranged above the flexible force-sensitive sensing layer, so that the heights of the flexible force-sensitive sensing layer and the force-sensitive detection point layer are different, the maximum pressure deformation value and the conductive path of the flexible pressure sensor are increased, and compared with the technical scheme that the conductive material and the flexible substrate are combined in a mode of poor uniformity such as coating or etching in the related art, the sensitivity of the flexible pressure sensor can be effectively improved.
According to some embodiments of the first aspect of the present application, at least one of the number of lateral detection points and the number of longitudinal detection points of the force-sensitive detection point layer is greater than or equal to 2.
According to some embodiments of the first aspect of the present application, the force-sensitive detection point layer comprises a first height detection point layer and a second height detection point layer, and the first height difference between the first height detection point layer and the flexible force-sensitive sensing layer is smaller than the second height difference between the second height detection point layer and the flexible force-sensitive sensing layer.
According to some embodiments of the first aspect of the present application, the detection points of the first level detection point layer are distributed with dislocation from the detection points of the second level detection point layer.
In a second aspect, an embodiment of the present application provides a method for manufacturing a flexible pressure sensor, where the method for manufacturing a flexible pressure sensor in the first aspect includes:
acquiring a plurality of conductive yarns and conductive leads;
weaving a plurality of conductive yarns according to a preset knitting method to obtain a flexible force-sensitive sensing layer;
weaving a plurality of conductive yarns above the flexible force-sensitive sensing layer to obtain a force-sensitive detection point layer;
and electrically connecting the flexible force-sensitive sensing layer with the force-sensitive detection point layer by utilizing the conductive lead to obtain the flexible pressure sensor.
According to some embodiments of the second aspect of the present application, the preset knitting method is a reverse knitting method.
According to some embodiments of the second aspect of the present application, the braiding a plurality of the conductive yarns over the flexible force-sensitive sensing layer to obtain a force-sensitive detection point layer includes:
confirming a target wale based on the flexible force-sensitive sensing layer;
weaving a plurality of conductive yarns above the target wales to obtain a first height detection point layer;
confirming a target course based on the first height detection point layer;
weaving a plurality of conductive yarns above the target transverse row to obtain a second height detection point layer;
and electrically connecting the first height detection point layer and the second height detection point layer by utilizing the conductive lead to obtain the force-sensitive detection point layer.
According to some embodiments of the second aspect of the present application, the braiding a plurality of the conductive yarns over the target wale to obtain the first height detection point layer includes:
and weaving a plurality of conductive yarns above the target wales by adopting a front-side knitting weaving method to obtain the first height detection point layer.
According to some embodiments of the second aspect of the present application, the braiding a plurality of the conductive yarns over the target course to obtain the second height detection point layer includes:
and weaving a plurality of conductive yarns above the target transverse row by adopting a loop-transfer twisting weaving method to obtain the second height detection point layer.
In a third aspect, embodiments of the present application also provide an electronic device comprising a flexible pressure sensor as described in the first aspect.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate and do not limit the invention.
FIG. 1 is a schematic block diagram of a flexible pressure sensor provided in one embodiment of the present application;
FIG. 2 is a schematic diagram of a force sensing point distribution of a flexible pressure sensor provided in accordance with another embodiment of the present application;
FIG. 3 is a schematic cross-sectional view of a flexible pressure sensor provided in accordance with another embodiment of the present application;
FIG. 4 is a flow chart of steps of a method of manufacturing a flexible pressure sensor provided in another embodiment of the present application;
FIG. 5 is a flowchart illustrating steps for obtaining a force-sensitive detection point layer according to another embodiment of the present application;
FIG. 6 is a flowchart illustrating steps for obtaining a first level of detection points according to another embodiment of the present application;
FIG. 7 is a flowchart illustrating steps for obtaining a second level of high detection points according to another embodiment of the present application;
FIG. 8 is an isometric view of a flexible pressure sensor provided in accordance with another embodiment of the present application;
FIG. 9 is a graph comparing resistivity versus pressure curves for different flexible pressure sensors provided in accordance with another embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.
It will be appreciated that although functional block diagrams are depicted in the device diagrams, logical sequences are shown in the flowchart, in some cases, the steps shown or described may be performed in a different order than the block diagrams in the device. The terms first, second and the like in the description, in the claims and in the above-described figures, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order.
The application provides a flexible pressure sensor, a manufacturing method of the flexible pressure sensor and electronic equipment, wherein the flexible pressure sensor comprises: the flexible pressure sensor comprises a flexible force-sensitive sensing layer, a force-sensitive detection point layer and a conductive lead, wherein the flexible force-sensitive sensing layer and the force-sensitive detection point layer are woven by conductive yarns, so that the flexible pressure sensor has good ductility and rebound resilience, the comfort level of the flexible pressure sensor can be effectively improved, the force-sensitive detection point layer is arranged above the flexible force-sensitive sensing layer, the conductive lead is respectively connected with the flexible force-sensitive sensing layer and the force-sensitive detection point layer, the heights of the flexible force-sensitive sensing layer and the force-sensitive detection point layer are different, the force-sensitive detection point layer and the flexible force-sensitive sensing layer are sequentially deformed under the action of the pressure, the maximum pressure deformation value of the flexible pressure sensor can be increased, the conductive path is increased, and the sensitivity of the flexible pressure sensor can be effectively improved. Based on the flexible pressure sensor provided by the application, the force-sensitive detection point layer is arranged above the flexible force-sensitive sensing layer, so that the heights of the flexible force-sensitive sensing layer and the force-sensitive detection point layer are different, the maximum pressure deformation value and the conductive path of the flexible pressure sensor are increased, and compared with the technical scheme that the conductive material and the flexible substrate are combined in a mode of poor uniformity such as coating or etching in the related art, the sensitivity of the flexible pressure sensor can be effectively improved.
Embodiments of the present application are further described below with reference to the accompanying drawings.
Referring to fig. 1, fig. 1 is a schematic block diagram of a flexible pressure sensor according to an embodiment of the present application, the flexible pressure sensor 100 includes:
a flexible force-sensitive sensing layer 110, the flexible force-sensitive sensing layer 110 being woven from conductive yarns;
the force-sensitive detection point layer 120, wherein the force-sensitive detection point layer 120 is formed by weaving conductive yarns, and the force-sensitive detection point layer 120 is arranged above the flexible force-sensitive sensing layer 110;
conductive leads 130, the conductive leads 130 being connected to the flexible force-sensitive sensing layer 110 and the force-sensitive detection point layer 120, respectively.
The embodiment of the application is not limited to the specific type of the conductive yarn, and may be a conductive blended yarn formed by blending stainless steel short fibers and polypropylene short fibers, a silver-plated fiber conductive yarn, an organic composite carbon black conductive yarn, or the like. The embodiment of the application is not limited to a specific preparation mode of the conductive yarn either, and the conductive yarn can be formed by blending stainless steel short fibers with the length of 5cm and the diameter of 8 mu m and polypropylene short fibers with the length of 5cm, or by twisting conductive blended yarns formed by blending two stainless steel short fibers and polypropylene short fibers to form a strand, and the like, wherein the weight blending ratio of the stainless steel short fibers can be 0.3 to 0.7. It can be appreciated that the conductive yarn is made of a conductive blended yarn formed by blending stainless steel short fibers and polypropylene short fibers, so that the conductive yarn has conductivity and good elastic performance, thereby ensuring the extensibility of the flexible force-sensitive sensing layer 110 and the force-sensitive detection point layer 120, and being better attached to the object to be detected, so as to improve the sensitivity of the flexible pressure sensor 100. Wherein, the diameter of the conductive yarn can be 0.4mm, and the ductility and the comfort of the flexible pressure sensor 100 can be effectively improved while the performance of the lead is ensured.
It should be noted that, the embodiment of the present application is not limited to the specific type of the conductive lead 130, and may be a conductive blended yarn formed by blending stainless steel short fibers and polypropylene short fibers, a silver-plated conductive nylon filament, a metal wire, or the like, so as to achieve a conductive function. It is appreciated that the diameter of the conductive leads 130 may be 0.1mm to 0.4mm, which may effectively improve the comfort of the flexible pressure sensor 100 while ensuring wire performance.
In addition, it should be noted that the embodiments of the present application are not limited to the specific number of the flexible force-sensitive sensing layer 110 and the force-sensitive detection point layer 120, and may be one layer or multiple layers.
It can be appreciated that the flexible force-sensitive sensing layer 110 and the force-sensitive detection point layer 120 are woven by conductive yarns, so that the flexible pressure sensor 100 has good ductility and rebound resilience, so that the flexible pressure sensor 100 can be better attached to an object to be detected, the comfort level of the flexible pressure sensor 100 can be effectively improved, and the sensitivity of the flexible pressure sensor 100 can be improved. The force-sensitive detection point layer 120 is disposed above the flexible force-sensitive sensing layer 110, and the conductive leads 130 are respectively connected with the flexible force-sensitive sensing layer 110 and the force-sensitive detection point layer 120, so that the detection heights of the flexible force-sensitive sensing layer 110 and the force-sensitive detection point layer 120 are different, the force-sensitive detection point layer 120 deforms under the action of pressure, the contact area between the conductive yarns in the force-sensitive detection point layer 120 is increased, the conductive paths of the force-sensitive detection point layer 120 are increased, the resistance is obviously reduced, and the sensitivity curve of the flexible pressure sensor 100 is in a straight line. When the pressure continues to increase, the flexible force-sensitive sensing layer 110 deforms, further increasing the conductive path of the flexible pressure sensor 100, and ensuring the sensitivity of the flexible pressure sensor 100. Through the height difference between the flexible force-sensitive sensing layer 110 and the force-sensitive detection point layer 120, the force-sensitive detection point layer 120 and the flexible force-sensitive sensing layer 110 deform in sequence, so that the maximum pressure deformation value of the flexible pressure sensor 100 can be increased, the conductive path is increased, and the sensitivity of the flexible pressure sensor 100 can be effectively improved. Meanwhile, the pressure sensitive response range of the flexible pressure sensor 100 can be prolonged, and the detection range and reliability of the flexible pressure sensor 100 are further improved. Based on the flexible pressure sensor 100 provided in this embodiment of the present application, the force-sensitive detection point layer 120 is disposed above the flexible force-sensitive sensing layer 110, so that the detection heights of the flexible force-sensitive sensing layer 110 and the force-sensitive detection point layer 120 are different, and a multi-level pressure-sensitive detection structure is formed, so as to increase the maximum pressure deformation value and the conductive path of the flexible pressure sensor 100.
Referring to fig. 2, in some embodiments of the present application, at least one of the number of lateral detection points and the number of longitudinal detection points of the force-sensitive detection point layer 120 is greater than or equal to 2.
It should be noted that, in the embodiment of the present application, the distribution manner of the detection points of the force-sensitive detection point layer 120 is not limited, and may be uniform distribution or random distribution, and it is understood that the uniform distribution of the detection points of the force-sensitive detection point layer 120 can ensure the pressure detection stability and accuracy of the force-sensitive detection point layer 120.
It is understood that at least one of the number of lateral detection points and the number of longitudinal detection points of the force-sensitive detection point layer 120 is greater than or equal to 2, the sensitivity of the force-sensitive detection point layer 120 can be ensured, thereby improving the sensitivity of the flexible pressure sensor 100.
In some embodiments of the present application, the force sensing point layer 120 includes a first height sensing point layer 121 and a second height sensing point layer 122, and the first height difference between the first height sensing point layer 121 and the flexible force sensing layer 110 is smaller than the second height difference between the second height sensing point layer 122 and the flexible force sensing layer 110.
The specific values of the first height difference and the second height difference are not limited in this embodiment, and the first height difference may be 0.1mm, the second height difference may be 0.2mm, the first height difference may be 0.2mm, the second height difference may be 0.3mm, and the like.
In addition, it should be noted that, in the embodiment of the present application, the specific structures of the first height detection point layer 121 and the second height detection point layer 122 are not limited, and as shown in fig. 3, the coil of the flexible force-sensitive sensor layer 110 may have a concave effect and be the pressure detection layer with the lowest height. The coils of the first elevation detection point layer 121 exhibit a convex effect such that the first elevation detection point layer 121 is higher than the flexible force-sensitive sensing layer 110. The second height detection point layer 122 is formed by overlapping two coils on the first height detection point layer 121 in a crossing manner, so that the second height detection point layer 122 is higher than the first height detection point layer 121.
It can be understood that the force-sensing point layer 120 includes a first height-sensing point layer 121 and a second height-sensing point layer 122, wherein the first height difference between the first height-sensing point layer 121 and the flexible force-sensing layer 110 is smaller than the second height difference between the second height-sensing point layer 122 and the flexible force-sensing layer 110, so as to form a multi-level pressure-sensing structure to increase the maximum pressure deformation value and the conductive path of the flexible pressure sensor 100. Under the action of the pressure, the second height detection point layer 122 deforms, the contact area between the conductive yarns in the second height detection point layer 122 increases, so that the conductive paths of the force-sensitive detection point layer 120 increase, the resistance drops obviously, and the sensitivity curve of the flexible pressure sensor 100 is in a straight line. As the pressure continues to increase, the first height sensing point layer 121 deforms, further increasing the conductive path of the force sensing point layer 120, and ensuring the sensitivity of the flexible pressure sensor 100. Through the height difference between the first height detection point layer 121 and the second height detection point layer 122, the second height detection point layer 122 and the first height detection point layer 121 deform in sequence, so that the maximum pressure deformation value of the flexible pressure sensor 100 can be increased, the conductive path is increased, and the sensitivity of the flexible pressure sensor 100 can be effectively improved.
In some embodiments of the present application, the detection points of the first level 121 are offset from the detection points of the second level 122.
It should be noted that, in the embodiment of the present application, the specific manner of the distribution of the detection points of the first height detection point layer 121 and the second height detection point layer 122 is not limited, and the detection points of the first height detection point layer 121 and the detection points of the second height detection point layer 122 may be distributed in a staggered manner, or the detection points of the first height detection point layer 121 and the detection points of the second height detection point layer 122 may be randomly distributed.
It can be understood that the detection points of the first height detection point layer 121 and the detection points of the second height detection point layer 122 are distributed in a staggered manner, so that the detection points of the force-sensitive detection point layer 120 are uniformly distributed, and meanwhile, the heights of the adjacent force-sensitive detection points in the lateral direction and the longitudinal direction of the force-sensitive detection point layer 120 are different, so that the pressure detection stability and the reliability of the force-sensitive detection point layer 120 can be ensured.
Referring to fig. 4, fig. 4 is a flowchart illustrating steps of a method for manufacturing a flexible pressure sensor according to another embodiment of the present application, where the method for manufacturing a flexible pressure sensor 100 includes:
step S410, obtaining a plurality of conductive yarns and conductive leads;
step S420, weaving a plurality of conductive yarns according to a preset knitting method to obtain a flexible force-sensitive sensing layer;
step S430, weaving a plurality of conductive yarns above the flexible force-sensitive sensing layer to obtain a force-sensitive detection point layer;
and step S440, electrically connecting the flexible force-sensitive sensing layer and the force-sensitive detection point layer by utilizing the conductive lead to obtain the flexible pressure sensor.
It should be noted that the embodiments of the present application are not limited to the specific number of conductive yarns and conductive leads 130, and may be adjusted according to actual requirements. The embodiment of the present application is not limited to a specific way of knitting a plurality of conductive yarns above the flexible force-sensitive sensing layer 110, and may be a common loop-forming way introduced into the flexible force-sensitive sensing layer 110, or stitch-knitting way stitch-knitted into the flexible force-sensitive sensing layer 110, etc.
It can be understood that, a plurality of conductive yarns and conductive leads 130 are obtained, and according to a preset knitting method, the plurality of conductive yarns are knitted to obtain the flexible force-sensitive sensing layer 110, and then the plurality of conductive yarns are knitted above the flexible force-sensitive sensing layer 110 to obtain the force-sensitive detection point layer 120, so that the detection heights of the flexible force-sensitive sensing layer 110 and the force-sensitive detection point layer 120 are different, and then the flexible force-sensitive sensing layer 110 and the force-sensitive detection point layer 120 are electrically connected by the conductive leads 130 to form a multi-level pressure-sensitive detection structure, so that the flexible pressure sensor 100 is obtained, and compared with the technical scheme that the conductive material and the flexible substrate are combined in a mode of increasing the maximum pressure deformation value and the conductive path of the flexible pressure sensor 100 and adopting a coating or etching mode with poor uniformity in the related art, the sensitivity of the flexible pressure sensor 100 can be effectively improved.
In some embodiments of the present application, the predetermined knitting method is a reverse knitting method.
The embodiment of the present application is not limited to the specific content of the knitting method, and may be a back knitting method, a front knitting method, or the like.
It can be appreciated that the back-side knitting method is adopted to knit a plurality of conductive yarns to obtain the flexible force-sensitive sensing layer 110, so that the back-side flat needle coil of the flexible force-sensitive sensing layer 110 is longitudinally moved to present a concave effect, and a pressure detection layer with the lowest height is formed, thereby increasing the height difference between the flexible force-sensitive sensing layer 110 and the force-sensitive detection point layer 120, prolonging the pressure-sensitive response range of the flexible pressure sensor 100, and further improving the detection range and reliability of the flexible pressure sensor 100.
In addition, referring to fig. 5, in an embodiment, step S430 in the embodiment shown in fig. 4 further includes, but is not limited to, the following steps:
step S510, confirming a target wale based on the flexible force-sensitive sensing layer;
step S520, weaving a plurality of conductive yarns above the target wale to obtain a first height detection point layer;
step S530, confirming the target horizontal line based on the first height detection point layer;
step S540, weaving a plurality of conductive yarns above the target course to obtain a second height detection point layer;
step S550, electrically connecting the first height detection point layer and the second height detection point layer by using the conductive lead to obtain the force-sensitive detection point layer.
It should be noted that, the embodiments of the present application are not limited to the specific number of the target columns and the target rows, and may be four target columns and two target rows, or may be multiple target columns and multiple target rows. The specific distribution manner of the target wales and the target courses is not limited, and the target wales and the target courses may be uniformly distributed or may be randomly distributed, and it may be understood that the target wales and the target courses are uniformly distributed, so that the detection points of the first altitude detection point layer 121 and the second altitude detection point layer 122 may be uniformly distributed, so that the detection points of the force-sensitive detection point layer 120 may be uniformly distributed, and the pressure detection stability and accuracy of the force-sensitive detection point layer 120 may be ensured.
It will be appreciated that, based on the flexible force-sensitive sensor layer 110, a target wale is identified so as to weave the plurality of conductive yarns over the target wale to obtain a first height-detecting point layer 121, then, based on the first height-detecting point layer 121, a target course is determined so as to weave the plurality of conductive yarns over the target course to obtain a second height-detecting point layer 122, and the obtained second height-detecting point layer 122 has a height difference from the first height-detecting point layer 121, such that the first height difference between the first height-detecting point layer 121 and the flexible force-sensitive sensor layer 110 is smaller than the second height difference between the second height-detecting point layer 122 and the flexible force-sensitive sensor layer 110, and the first height-detecting point layer 121 and the second height-detecting point layer 122 have non-overlapping portions so as to ensure reliability of the flexible force sensor 100 obtained later. And then, the conductive leads 130 are used to electrically connect the first height detection point layer 121 and the second height detection point layer 122 to form a multi-level pressure-sensitive detection structure, so as to obtain the pressure-sensitive detection point layer 120, thereby increasing the maximum pressure deformation value and the conductive path of the flexible pressure sensor 100.
In addition, referring to fig. 6, in an embodiment, step S520 in the embodiment shown in fig. 5 further includes, but is not limited to, the following steps:
step S610, a front knitting method is adopted to knit a plurality of conductive yarns above the target wales, so as to obtain a first height detection point layer.
It should be noted that the embodiment of the present application is not limited to a specific manner of knitting the plurality of conductive yarns above the target wale, and may be a front-side knitting method, a back-side knitting method, or the like.
It can be appreciated that, by adopting the front knitting method, a plurality of conductive yarns are knitted above the target wale to obtain the first height detection point layer 121, so that the loops of the first height detection point layer 121 have a convex effect, and the first height detection point layer 121 is higher than the flexible force-sensitive sensing layer 110. The first height detection point layer 121 and the flexible force-sensitive sensing layer 110 form a concave-convex effect, so that the sensitivity of the flexible pressure sensor 100 can be effectively improved.
In addition, referring to fig. 7, in an embodiment, step S540 in the embodiment shown in fig. 5 further includes, but is not limited to, the following steps:
step S710, knitting a plurality of conductive yarns above the target course by adopting a loop-transfer hank knitting method to obtain a second height detection point layer.
It can be understood that, by adopting the loop-transfer twisted-pattern knitting method, the left and right two loops are mutually crossed and overlapped to weave a plurality of conductive yarns above the target course, so that a bump effect is formed on the first height detection point layer 121, and the plurality of bump areas form the second height detection point layer 122, so that the second height detection point layer 122 is higher than the first height detection point layer 121.
Referring to fig. 8, in an embodiment, the method for manufacturing the flexible pressure sensor may further include knitting with a weft knitting machine with a density of 7 needles, wherein the conductive yarn is formed by blending a stainless steel short fiber with a length of 5cm and a diameter of 8 μm and a polypropylene short fiber with a length of 5cm, and the weight blending ratio of the stainless steel short fiber is 0.5.
In the weaving process, 8 knitting needles are used for each of the front and rear needle bed knitting needles, and 16 knitting needles are used in total. Wherein, the 5 th needle to the 8 th needle and the 13 th needle to the 16 th needle weave reverse weft plain stitch wales, forming the flexible force-sensitive sensing layer 110 with the lowest height. Subsequently, the 1 st to 4 th needles and the 9 th to 12 th needles weave front plain stitch wales, wherein the 2 nd to 8 th rows and the 10 th to 16 th rows constitute the first height detection point layer 121. And the remaining rows 1 and 9 adopt a four-needle loop-transferring twisting pattern, namely, the left two needles and the right two needles are mutually intersected to form a twisting pattern, so as to form a second height detection point layer 122.
The combination of the back flat knitting wales and the front flat knitting wales forms a concave-convex effect, and the back flat knitting wales of the flexible pressure sensor, namely the flexible force-sensitive sensing layer 110, presents a concave effect and is a pressure detection layer with the lowest height; the front side wale presents a convex effect, the height of the front side wale is higher than that of the flexible force-sensitive sensing layer 110, the loop transfer twisting area is formed by overlapping left and right coils in a crossing way, the height of the front side wale is further increased, namely a second height detection point layer 122 is formed, and the rest front side wale areas without the loop transfer twisting structure are first height detection point layers 121.
Each detection point of the second height detection point layer 122 has a size of 4 x 1 rows, each detection point of the first height detection point layer 121 has a size of 4 x 7 rows, and adjacent force-sensitive detection points have different heights and are uniformly distributed in a dispersed manner, so that external pressure load is ensured to be uniformly borne, and the sensitivity of the flexible pressure sensor is effectively improved.
Referring to fig. 9, fig. 9 is a graph comparing the rate of change of electrical resistance versus pressure for various flexible pressure sensors. Wherein, curve a is a resistance change rate-pressure relation curve corresponding to the flexible pressure sensor including the flexible force-sensitive sensing layer 110, the first height detection point layer 121 and the second height detection point layer 122, and curve b is a resistance change rate-pressure relation curve corresponding to the flexible pressure sensor having only the flexible force-sensitive sensing layer 110. The flexible pressure sensor comprising flexible force-sensitive sensing layer 110, first height detection point layer 121 and second height detection point layer 122 has a maximum sensitivity of about 29kPa within a pressure detection range of 0kPa to 3.5kPa -1 Wherein the sensitivity linear detection range is 0kPa to 3kPa, also can be detectedExtremely low pressure of 0kPa to 0.4kPa, fast pressure-sensitive response time and high sensitivity. Whereas the flexible pressure sensor having only the flexible force-sensitive sensor layer 110 has a maximum sensitivity of about 27kPa within a pressure detection range of 0 to 3.5kPa -1 Wherein the sensitivity linear detection range of the flexible pressure sensor of only the flexible force-sensitive sensing layer 110 is 0.35kPa to 1.4kPa, and the detection range of the linear sensitivity is significantly weaker than that of the flexible pressure sensor including the flexible force-sensitive sensing layer 110, the first height detection point layer 121, and the second height detection point layer 122.
In one embodiment, the manufacturing method of the flexible pressure sensor may further include knitting with a weft knitting machine with a density of 7 needles, wherein the conductive yarn is formed by blending stainless steel short fibers with a diameter of 0.4mm and polypropylene short fibers, and the weight blending ratio of the stainless steel short fibers is 0.5.
In the weaving process, a fifth knitting needle and a sixth knitting needle are selected, a weft knitting plain stitch is knitted, the horizontal width is at least 8cm, the longitudinal length is at least 8cm, and the flexible force-sensitive sensing layer 110 is manufactured. The thickness of the flexible force-sensitive sensing layer 110 is a single-layer weft flat needle conductive layer, and is the pressure detection layer with the lowest height. Subsequently, a weft plain conductive layer having a size of 1cm×1cm was woven using a conductive yarn obtained by blending stainless steel staple fibers and polypropylene staple fibers. Then, four sides of the single 1cm×1cm weft flat needle conductive layer are stitch-bonded to the flexible force-sensitive sensing layer 110 using conductive yarns, to form a first height detection point layer 121 having a thickness of two weft flat needle conductive layers as a first height pressure detection layer. And then stitch-knitting four edges of the two 1cm multiplied by 1cm weft flat needle conductive layers which are overlapped up and down to the flexible force-sensitive sensing layer 110 by adopting conductive yarns to form a second height detection point layer 122 with the thickness of three layers of weft flat needle conductive layers, wherein the second height detection point layer is used as a second height pressure detection layer.
In addition, an embodiment of the present application also provides an electronic device including the flexible pressure sensor 100 described above.
It should be noted that, the embodiment of the application is not limited to a specific type of the electronic device, and may be an intelligent wearable device, an intelligent machine device with man-machine interaction, or the like.
In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While the preferred embodiments of the present application have been described in detail, the present application is not limited to the above embodiments, and various equivalent modifications and substitutions can be made by those skilled in the art without departing from the spirit of the present application, and these equivalent modifications and substitutions are intended to be included in the scope of the present application as defined in the appended claims.
Claims (10)
1. A flexible pressure sensor, comprising:
the flexible force-sensitive sensing layer is formed by weaving conductive yarns;
the force-sensitive detection point layer is formed by weaving the conductive yarns, and is arranged above the flexible force-sensitive sensing layer;
and the conductive leads are respectively connected with the flexible force-sensitive sensing layer and the force-sensitive detection point layer.
2. The flexible pressure sensor of claim 1, wherein at least one of a number of lateral detection points and a number of longitudinal detection points of the force-sensitive detection point layer is greater than or equal to 2.
3. The flexible pressure sensor of claim 1, wherein the force sensing point layer comprises a first height sensing point layer and a second height sensing point layer, the first height difference between the first height sensing point layer and the flexible force sensing layer being less than the second height difference between the second height sensing point layer and the flexible force sensing layer.
4. A flexible pressure sensor as claimed in claim 3 wherein the detection points of the first level detection point layer are offset from the detection points of the second level detection point layer.
5. A method of manufacturing a flexible pressure sensor for manufacturing the flexible pressure sensor according to any one of claims 1 to 4, the method comprising:
acquiring a plurality of conductive yarns and conductive leads;
weaving a plurality of conductive yarns according to a preset knitting method to obtain a flexible force-sensitive sensing layer;
weaving a plurality of conductive yarns above the flexible force-sensitive sensing layer to obtain a force-sensitive detection point layer;
and electrically connecting the flexible force-sensitive sensing layer with the force-sensitive detection point layer by utilizing the conductive lead to obtain the flexible pressure sensor.
6. The method of manufacturing a flexible pressure sensor according to claim 5, wherein the predetermined knitting method is a reverse knitting method.
7. The method of manufacturing a flexible pressure sensor of claim 5, wherein braiding a plurality of said conductive yarns over said flexible force-sensitive sensing layer to provide a force-sensitive detection point layer, comprising:
confirming a target wale based on the flexible force-sensitive sensing layer;
weaving a plurality of conductive yarns above the target wales to obtain a first height detection point layer;
confirming a target course based on the first height detection point layer;
weaving a plurality of conductive yarns above the target transverse row to obtain a second height detection point layer;
and electrically connecting the first height detection point layer and the second height detection point layer by utilizing the conductive lead to obtain the force-sensitive detection point layer.
8. The method of manufacturing a flexible pressure sensor according to claim 7, wherein the braiding a plurality of the conductive yarns over the target wale to obtain the first height detection point layer comprises:
and weaving a plurality of conductive yarns above the target wales by adopting a front-side knitting weaving method to obtain the first height detection point layer.
9. The method of manufacturing a flexible pressure sensor according to claim 7, wherein the braiding a plurality of the conductive yarns over the target course to obtain the second height detection point layer comprises:
and weaving a plurality of conductive yarns above the target transverse row by adopting a loop-transfer twisting weaving method to obtain the second height detection point layer.
10. An electronic device comprising a flexible pressure sensor as claimed in any one of claims 1 to 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310297186.0A CN116337289A (en) | 2023-03-23 | 2023-03-23 | Flexible pressure sensor, manufacturing method of flexible pressure sensor and electronic equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310297186.0A CN116337289A (en) | 2023-03-23 | 2023-03-23 | Flexible pressure sensor, manufacturing method of flexible pressure sensor and electronic equipment |
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| CN116337289A true CN116337289A (en) | 2023-06-27 |
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| CN202310297186.0A Pending CN116337289A (en) | 2023-03-23 | 2023-03-23 | Flexible pressure sensor, manufacturing method of flexible pressure sensor and electronic equipment |
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