CN208998966U - A kind of capacitance type touch sensor based on zero Poisson's ratio structure - Google Patents
A kind of capacitance type touch sensor based on zero Poisson's ratio structure Download PDFInfo
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- CN208998966U CN208998966U CN201820875081.3U CN201820875081U CN208998966U CN 208998966 U CN208998966 U CN 208998966U CN 201820875081 U CN201820875081 U CN 201820875081U CN 208998966 U CN208998966 U CN 208998966U
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Abstract
The utility model discloses a kind of capacitance type touch sensors based on zero Poisson's ratio structure, including upper electrode layer, lower electrode layer and the zero Poisson's ratio structure dielectric layers between two electrode layers；The zero Poisson's ratio structure dielectric layers are made of several structure cells；The structure cell is arranged into an array, and the upper surface of the structure cell of top layer is one layer of smooth flexible photosensitive resin layer, for connecting with upper electrode layer；The lower surface of the structure cell of bottom is one layer of smooth flexible photosensitive resin layer, for connecting with lower electrode layer；The longitudinal section of each structure cell is convex shape structure, and the bottom surface of convex shape structure is recessed；The outer cell wall of structure cell and the angle of vertical direction are always α；When stimulation of the sensor by normal pressure, since the value of α is constant always, so that the transverse strain perpendicular to loading direction is always zero, the strain of loading direction is only generated, equivalent Poisson's ratio is always zero.
Description
Technical field
The utility model relates to touch sensor, it is specifically a kind of for measure normal pressure based on zero Poisson's ratio structure
Capacitance type touch sensor.
Background technique
Touch sensor is robot and the required medium that external environment directly acts on.It can direct measurement object and environment
A variety of nature and characteristics.With the progress of human lives, the interpersonal cooperation of machine is more and more closer, grinds to robot
Study carefully more and more deep, assigns its corresponding vision, tactile to realizing that machine person to person preferably cooperates and have important meaning.At present
Comparatively vision develops maturation, but the development of tactile is also in constantly research and development.Tactile is to realization robot
Intelligent particularly important, it can directly reflect the various information of surrounding enviroment to robot.But the tactile skin studied at present
Sensor, major function are and to lack flexibility for experiencing mechanical external force.
Existing research shows that various forms of micro-structures are added in the dielectric layer, the mechanical characteristic meeting under haptic stimulus
Improve the sensitivity of touch sensor.The dielectric layer material of current most of uses is all dimethyl silicone polymer (PDMS), benefit
With PDMS material liquid-solid conversion characteristic, different structure preparations is realized.But PDMS material is as electronic skin dielectric layer
Raw materials for production, pliability are inadequate.The dielectric layer that flexible photosensitive resin prints, pliability are more preferable.
Application No. is 201610644815.2 document disclose a kind of sandwich style flexible capacitance type pressure sensor and
Preparation method, the pressure sensor preparation for processing is complicated, while using multielectrode capacitance, can generate very high noise
Than parasitic capacitance is affected, and using the method for binding silver paste as lead, processing technology requires height, is not easy to advise greatly
Mould processing.
Utility model content
In view of the deficiencies of the prior art, the technical issues of the utility model intends to solve is to provide a kind of based on zero Poisson's ratio
The capacitance type touch sensor of structure.
The technical solution that the utility model solves the technical problem is to provide a kind of capacitor based on zero Poisson's ratio structure
Formula touch sensor, it is characterised in that the sensor includes upper electrode layer, lower electrode layer and zero pool between two electrode layers
Pine compares structure dielectric layers；The zero Poisson's ratio structure dielectric layers are made of several structure cells；The structure cell is at array
Arrangement, the upper surface of the structure cell of top layer is one layer of smooth flexible photosensitive resin layer, for connecting with upper electrode layer；Bottom
The lower surface of structure cell be one layer of smooth flexible photosensitive resin layer, for being connect with lower electrode layer；Each structure cell
Longitudinal section be convex shape structure, the bottom surface of convex shape structure is recessed；The outer cell wall of structure cell and the angle of vertical direction
For definite value；When stimulation of the sensor by normal pressure, the value of angle is constant always.
Compared with prior art, the utility model beneficial effect is:
1, intermediate dielectric layer uses flexible photosensitive resin, is printed using photocuring technology, has certain softness
Property, it is designed by reasonable structure, realizes that Poisson's ratio is zero, when detecting normal pressure, reduce transverse strain, avoid laterally answering
Become the error caused by force analysis size, mechanical characteristic can effectively improve the sensitivity of sensor, make pressure to greatest extent
Be converted into capacitor, measurement capacitance is more acurrate, improves pressure detecting precision.
2, the design of zero Poisson's ratio structure is determined by definition ν=- ε ι/ε of Poisson's ratio, and wherein ν represents Poisson's ratio,
It is defined as the absolute value ratio of transverse normal strain ε ι and axial normal strain ε.Therefore needing transverse normal strain is zero, only longitudinal to answer
Become, so as to improve the detection accuracy and sensitivity of touch sensor.
3, the upper/lower electrode layer of the sensor and dielectric layer are overall structure, reduce be sealingly engaged between three-decker it is not tight
Caused measurement error.
Detailed description of the invention
Fig. 1 is a kind of overall structure of embodiment of capacitance type touch sensor of the utility model based on zero Poisson's ratio structure
Schematic diagram；
Fig. 2 is a kind of dielectric layer knot of capacitance type touch sensor embodiment of the utility model based on zero Poisson's ratio structure
Structure schematic diagram；
Fig. 3 is a kind of dielectric layer of embodiment of capacitance type touch sensor of the utility model based on zero Poisson's ratio structure
Structure cell axonometric schematic diagram；
Fig. 4 is a kind of dielectric layer of embodiment of capacitance type touch sensor of the utility model based on zero Poisson's ratio structure
Structure cell schematic front view；
Fig. 5 is a kind of dielectric layer of embodiment of capacitance type touch sensor of the utility model based on zero Poisson's ratio structure
Cellular front view structure Parameter Principle figure；(in figure: 1, upper electrode layer；2, zero Poisson's ratio structure dielectric layers；3, lower electrode layer)；
Specific embodiment
Specific embodiment of the utility model is given below.Specific embodiment is only used for being further described originally practical new
Type does not limit the protection scope of the claim of this application.
The utility model provides a kind of capacitance type touch sensor based on zero Poisson's ratio structure (referring to Fig. 1-5, referred to as
Sensor), for measuring the size of normal pressure, it is characterised in that the sensor includes upper electrode layer 1, lower electrode layer 3 and is located at
Zero Poisson's ratio structure dielectric layers 2 between two electrode layers；The zero Poisson's ratio structure dielectric layers 2 are by several 21 structures of structure cell
At；The structure cell 21 is arranged into an array, and the upper surface of the structure cell 21 of top layer is one layer of smooth flexible photosensitive resin
Layer, for being connect with upper electrode layer 1 by screen printing technique；The lower surface of the structure cell 21 of bottom is one layer smooth soft
Property photosensitive resin layer, for being connect with lower electrode layer 3 by screen printing technique；The longitudinal section of each structure cell 21 is similar
Convex shape structure, the bottom surface recess of convex shape structure；The top of convex shape structure and the angle of vertical direction are always α, i.e.,
The outer cell wall of structure cell 21 and the angle of vertical direction are always α, and cell wall proportionality coefficient is that (wherein M indicates interior born of the same parents to K=M/L
Wall length, L indicate outer cell wall length, and K is definite value)；When stimulation of the sensor by normal pressure, since the value of α is constant always, make
It must be always zero perpendicular to the strain of loading direction, i.e., transverse strain is zero, so that the load that sensor is subject to only generates load
The strain in direction, i.e. pressure can be fully converted to the variation of capacitance, and meeting equivalent Poisson's ratio is always zero.
Poisson's ratio formula ν=- ε ι/ε is converted to the equivalent Poisson's ratio formula for containing only α and K are as follows:Wherein cos α > 1/2K；As K≤0.5,0 <
α<arcsinK；As K>0.5, arccos (1/2k)<α<arcsinK；Under this precondition, K=0.5, μ=0 is enabled to bring into
It imitates Poisson's ratio formula, obtains α=27 ° (α takes 0-30 °)；So with this condition, when α=27 °, the equivalent pool of structure cell
Pine is than being 0；
The upper electrode layer 1 and lower electrode layer 3 coat one layer of graphene using flexible resin as substrate on a flexible substrate
Conductive film forms conductive graphene electrode；
The zero Poisson's ratio structure dielectric layers 2 are obtained using flexible photosensitive resin as raw material using photocuring technology 3D printing
The micro-structure that equivalent Poisson's ratio is zero.
The sensor with a thickness of 5mm ± 1mm.
The working principle and workflow of capacitance type touch sensor of the utility model based on zero Poisson's ratio structure are:
When stimulation of the sensor by normal pressure, so that the strain that compression generates constantly increases, upper electrode layer 1 generates shape
Become, zero Poisson's ratio structure dielectric layers 2 can deformation occurs, but the structural particularity of structure cell 21 makes that transverse direction will not both occur
Expansion, will not cross-direction shrinkage, only can generate longitudinal compression, the equivalent Poisson's ratio of zero Poisson's ratio structure dielectric layers 2 is zero, and
And the distance between upper electrode layer 1 and lower electrode layer 3 change, since the material of zero Poisson's ratio structure dielectric layers 2 is using soft
Property resin, elasticity modulus is constant, thus generate deformation be directly proportional to the pressure.By the principle of capacitance type touch sensor
It is found that the distance between parallel plate electrode will affect the change of capacitor, so as to which pressure change to be converted to the variation of capacitor, lead to
Measurement capacitance variations are crossed to determine the size of pressure.When outer detecting circuit acquires capacitance signal, since upper electrode layer 1 is under
The distance between electrode layer 3 changes, and capacitance will change correspondingly, to detect the variation of pressure.
When experiment, the counterweight of 20g is placed on a sensor, by conducting wire extraction electrode, is connected to the industry control of NI company
On the connecting terminal of the data collecting card of machine, process control is carried out in Labview environment, is realized by data collecting card pair
The acquisition of capacitance signal.Using digital display Tension-pressure tester to sensor apply normal pressure, and by collected capacitance with
Pressure is demarcated, to realize the detection to pressure.The size of the sensor is 100*100*5mm, data collecting card
Model NI PXI-6251, the model NI PXIe-1065 of industrial personal computer, the model ZQ-21B- of digital display Tension-pressure tester
1。
The utility model does not address place and is suitable for the prior art.
Claims (4)
1. a kind of capacitance type touch sensor based on zero Poisson's ratio structure, it is characterised in that the sensor include upper electrode layer,
Lower electrode layer and the zero Poisson's ratio structure dielectric layers between two electrode layers；The zero Poisson's ratio structure dielectric layers are by several
Structure cell is constituted；The structure cell is arranged into an array, and the upper surface of the structure cell of top layer is one layer of smooth flexible light
Quick resin layer, for being connect with upper electrode layer；The lower surface of the structure cell of bottom is one layer of smooth flexible photosensitive resin layer,
For being connect with lower electrode layer；The longitudinal section of each structure cell is convex shape structure, and the bottom surface of convex shape structure is recessed；Member
The outer cell wall of born of the same parents' structure and the angle of vertical direction are definite value；When stimulation of the sensor by normal pressure, the value of angle is always not
Become.
2. the capacitance type touch sensor according to claim 1 based on zero Poisson's ratio structure, it is characterised in that on described
Electrode layer and lower electrode layer coat one layer of grapheme conductive film using flexible resin as substrate on a flexible substrate, are formed conductive
Graphene electrodes.
3. the capacitance type touch sensor according to claim 1 based on zero Poisson's ratio structure, it is characterised in that described zero
For Poisson's ratio structure dielectric layers using flexible photosensitive resin as raw material, obtaining equivalent Poisson's ratio using photocuring technology 3D printing is zero
Micro-structure.
4. the capacitance type touch sensor according to claim 1 based on zero Poisson's ratio structure, it is characterised in that the biography
Sensor with a thickness of 5mm ± 1mm.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108613758A (en) * | 2018-06-07 | 2018-10-02 | 河北工业大学 | A kind of capacitance type touch sensor based on zero Poisson's ratio structure |
| CN110487450A (en) * | 2019-08-23 | 2019-11-22 | 南方科技大学 | A kind of flexible touch sensation sensor and its preparation method and application |
| CN111044181A (en) * | 2019-12-19 | 2020-04-21 | 华南理工大学 | Gradient zero Poisson ratio structure capacitive flexible touch sensor and preparation method thereof |
| CN113834418A (en) * | 2021-09-06 | 2021-12-24 | 电子科技大学 | Flexible strain sensor with adjustable Poisson ratio |
-
2018
- 2018-06-07 CN CN201820875081.3U patent/CN208998966U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108613758A (en) * | 2018-06-07 | 2018-10-02 | 河北工业大学 | A kind of capacitance type touch sensor based on zero Poisson's ratio structure |
| CN110487450A (en) * | 2019-08-23 | 2019-11-22 | 南方科技大学 | A kind of flexible touch sensation sensor and its preparation method and application |
| CN110487450B (en) * | 2019-08-23 | 2021-09-07 | 南方科技大学 | Flexible touch sensor and preparation method and application thereof |
| CN111044181A (en) * | 2019-12-19 | 2020-04-21 | 华南理工大学 | Gradient zero Poisson ratio structure capacitive flexible touch sensor and preparation method thereof |
| CN111044181B (en) * | 2019-12-19 | 2021-10-26 | 华南理工大学 | Gradient zero Poisson ratio structure capacitive flexible touch sensor and preparation method thereof |
| CN113834418A (en) * | 2021-09-06 | 2021-12-24 | 电子科技大学 | Flexible strain sensor with adjustable Poisson ratio |
| CN113834418B (en) * | 2021-09-06 | 2023-04-18 | 电子科技大学 | Flexible strain sensor with adjustable Poisson ratio |
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