CN107290082A - A kind of capacitance type touch sensor - Google Patents
A kind of capacitance type touch sensor Download PDFInfo
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- CN107290082A CN107290082A CN201610221591.4A CN201610221591A CN107290082A CN 107290082 A CN107290082 A CN 107290082A CN 201610221591 A CN201610221591 A CN 201610221591A CN 107290082 A CN107290082 A CN 107290082A
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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
- G01L1/14—Measuring force or stress, in general by measuring variations in capacitance or inductance of electrical elements, e.g. by measuring variations of frequency of electrical oscillators
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Abstract
The present invention relates to a kind of capacitance type touch sensor, the capacitance type touch sensor includes the first A types electrode layer, the first flexible dielectric layer, the first Type B electrode layer, the second flexible dielectric layer and the 2nd A type electrode layers set gradually；When A types electrode is positive electrode, Type B electrode is negative electrode；When A types electrode is negative electrode, Type B is positive electrode；Wherein, the first A types electrode layer and the 2nd A type electrode layers are parallel to each other, and are set with the first Type B electrode layer square crossing；The respective column short circuit of first A types electrode layer and the 2nd A type electrode layers is simultaneously individually drawn by wire, and the often row of the first Type B electrode layer is individually drawn by wire；First A types electrode layer, the 2nd A types electrode layer and the first Type B electrode layer include conductive materials；The electrode of first flexible dielectric layer and the second flexible dielectric layer is elastic compressible material.The present invention improves the sensitivity of pressure/capacitance type touch sensor, expands the range ability of sensor.
Description
Technical field
The invention belongs to sensor field, and in particular to a kind of capacitance type touch sensor.
Background technology
Capacitance type sensor can be used for the parameters such as the measurement sound intensity, liquid level, water content, vibration, pressure, displacement, can especially measure nano level micro-displacement value.Capacitive sensor structure is simple, sensitivity is high, dynamic response is high and cheap.
Capacitance type sensor has very big market in terms of faint pressure detecting, such as, and in tactile sensing device of robot, motion analysis, wearable device and field of medical device, capacitance type sensor suffers from extensive use.
The principle of test using capacitance sensor pressure is as shown in Figure 1.Capacitance sensor is made up of two battery lead plates up and down and middle elastomeric dielectric matter.Assuming that capacitance is C, the dielectric constant of dielectric medium is ε, and electrode plate suqare is that spacing is d between A, two battery lead plates, then capacitance meets below equation：
C=ε * A/d
When there is pressure (P) to press battery lead plate, the distance between two battery lead plates shorten, so as to cause capacitance to change.Pressure is bigger, and the distance between battery lead plate is smaller, and capacitance is bigger.Therefore, pressure and capacitance positive correlation.Capacitance pressure transducer, is exactly to detect the change of pressure by detecting the change of capacitance.
Fig. 2 is a kind of typical capacitance pressure transducer, array.The array is made up of the elastomeric dielectric layer of row electrode strip 201, row electrode strip 202 and centre.Row electrode strip 201 and row electrode strip 202 are drawn and are connected in capacitive detection circuit by wire 204 and wire 203 respectively.Any row electrode strip 201 part overlapping with row electrode strip 202, constitutes the induction point of a capacitance pressure transducer,.Detect the pressure signal of certain point in array, it is only necessary to detect the capacitance between the corresponding row electrode strip of the point and row electrode strip.But the sensitivity of this capacitance pressure transducer, array is not high, and measuring range is smaller.
The content of the invention
In order to solve the above-mentioned technical problem, the present invention proposes a kind of capacitance type touch sensor, and the capacitance type touch sensor is not while original pressure-volume sensor array area is changed, the transducer sensitivity that can be effectively improved, and expands the range of sensor.
The present invention proposes following technical scheme：
(1) a kind of capacitance type touch sensor, the capacitance type touch sensor includes the first A types electrode layer, the first flexible dielectric layer, the first Type B electrode layer, the second flexible dielectric layer and the 2nd A type electrode layers set gradually；When A types electrode is positive electrode, Type B electrode is negative electrode；When A types electrode is negative electrode, Type B is positive electrode；
Wherein, the first A types electrode layer and the 2nd A type electrode layers are parallel to each other, and are set with the first Type B electrode layer square crossing；The respective column short circuit of first A types electrode layer and the 2nd A type electrode layers is simultaneously individually drawn by wire, and the often row of the first Type B electrode layer is individually drawn by wire；
First A types electrode layer, the 2nd A types electrode layer and the first Type B electrode layer include conductive materials；
The electrode of first flexible dielectric layer and the second flexible dielectric layer is elastic compressible material.
(2) on the basis of technical scheme (1), the capacitance type touch sensor also includes the first expansion structure, and first expansion structure includes the flexible dielectric layer and Type B electrode layer set gradually；
First expansion structure is set close to the first A types electrode layer or the 2nd A types electrode layer.
(3) on the basis of technical scheme (1) or (2), the capacitance type touch sensor also includes the second expansion structure, and second expansion structure includes the 3rd flexible dielectric layer, Type B electrode layer, the 4th flexible dielectric layer and the A type electrode layers set gradually；
The A types electrode layer of second expansion structure close to the first A types electrode layer, the 2nd A types electrode layer or the first expansion structure is set.
(4) on the basis of technical scheme (3), second prolongation structure is one or more；When the second prolongation structure is multiple, the A types electrode layer that flexible dielectric layer close to the first A types electrode layer, the 2nd A types electrode layer or another second expansion structure in outside are located in the second prolongation structure is set.
(5) on the basis of technical scheme (1), (2), (3) or (4), each Type B electrode layer is separately provided, or is bent to form by same Type B electrode layer.
(6) on the basis of technical scheme (1), (2), (3), (4) or (5), each A types electrode layer is separately provided, or is bent to form by same A types electrode layer.
(7) a kind of capacitance type touch sensor, the first publicly publicly electrode layer of electrode layer, the first flexible dielectric layer, first sensor array layer, the second flexible dielectric layer and second that the capacitance type touch sensor includes setting gradually；
Wherein, first publicly electrode layer and second publicly electrode layer respectively from up and down both sides cover first sensor array layer all the sensors array region, and first publicly electrode layer with second publicly electrode layer conducting；First publicly electrode layer and second publicly electrode layer be conductive materials；
The electrode of first flexible dielectric layer and the second flexible dielectric layer is elastic compressible material.
(8) on the basis of technical scheme (7), capacitance type touch sensor also includes prolongation structure, and the prolongation structure includes flexible dielectric layer, sensor array layer, flexible dielectric layer and the publicly electrode layer set gradually；Flexible dielectric layer on the outside of prolongation structure close to first publicly electrode layer set, or close to second publicly electrode layer set；
Wherein, each sensor array layer is located at same position, each corresponding sensor sensing point short circuit.
(9) on the basis of technical scheme (8), the prolongation structure is one or more；When prolongation structure for it is multiple when, the publicly electrode layer that the flexible dielectric layer in outside close to the second publicly electrode layer, first publicly electrode layer or another prolongation structure are located in prolongation structure is set.
(10) on the basis of technical scheme (7), (8) or (9), respectively publicly electrode layer is separately provided, or is bent to form by same publicly electrode layer.
The core of touch sensor of the present invention is：The real area of sensor is not increased, an electrode as the public positive electrode or public negative electrode of two electric capacity, constitutes a pressure sensitive point of touch sensor in the form of a laminate simultaneously.When there is pressure pressing in sensor surface, the battery lead plate spacing of these electric capacity changes simultaneously, is together in parallel equivalent to multiple electric capacity.This aspect improves the sensitivity of sensor, on the other hand adds the compressible scope of sensor, so as to expand the range of sensor.
Beneficial effects of the present invention：Present invention firstly provides terrace pressure/capacitance type Study of Touch Sensor, the sensitivity of pressure/capacitance type touch sensor is improved, the range ability of sensor is expanded.In addition, the present invention can be generally applicable to need the design of the touch sensor of dense distribution induction point in small area.
Brief description of the drawings
Fig. 1 is the principle schematic of existing test using capacitance sensor pressure.
Fig. 2 is the structural representation of existing capacitance pressure transducer, array.
Fig. 3 (a) is the top view of the capacitance type touch sensor of embodiment 1 proposed by the present invention.
Fig. 3 (b) is the sectional view of the capacitance type touch sensor of embodiment 1 proposed by the present invention.
Fig. 4 (a) is the top view of the capacitance type touch sensor of embodiment 2 proposed by the present invention.
Fig. 4 (b) is the sectional view of the capacitance type touch sensor of embodiment 2 proposed by the present invention.
Fig. 5 (a) is the sectional view of the first extended mode proposed by the present invention based on embodiment 1.
Fig. 5 (b) is the sectional view of second of extended mode proposed by the present invention based on embodiment 1.
Fig. 6 (a) is the sectional view of the extended mode proposed by the present invention based on embodiment 2.
The lead connection diagram of Fig. 6 (b) extended modes proposed by the present invention based on embodiment 2.
Embodiment
For the object, technical solutions and advantages of the present invention are more clearly understood, below in conjunction with specific embodiment, and referring to the drawings, the present invention is described in more detail.But those skilled in the art know, the invention is not limited in accompanying drawing and following examples.
The invention provides a kind of capacitance type touch sensor, the sensor can effectively improve the sensitivity of pressure capacitance type sensor, range extension, and be particularly suitable for use in needs to gather the application scenarios of multiple pressure sensitive points in limited areal.
Embodiment 1：
Such as Fig. 3 (a) and the top view and profile for shown in 3 (b) being respectively capacitance type touch sensor proposed by the present invention.The capacitance type touch sensor includes the first positive electrode layer 301, the first flexible dielectric layer 302, positive electrode layer 303, the second flexible dielectric layer 304 and the second positive electrode layer 305 set gradually.
Wherein, first positive electrode layer, the second positive electrode layer and positive electrode layer are strip, first positive electrode layer and the second positive electrode layer be arranged in parallel, first positive electrode layer and the second positive electrode layer are put with positive electrode layer square crossing respectively, Fig. 3 (a) and Fig. 3 (b) show that a positive electrode layer and the second positive electrode layer are row electrode strip, and positive electrode layer 303 is the example of row electrode strip；The respective column short circuit of first positive electrode layer and the second positive electrode layer is simultaneously individually drawn by wire 306, and the often row of positive electrode layer 303 is individually drawn by wire 307.
First positive electrode layer 301, the second positive electrode layer 305 and positive electrode layer 303 include conductive materials, such as copper foil, conduction cloth, electric silica gel or flexible PCB, preferably flexible PCB.Wherein, the first positive electrode layer 301 and the second positive electrode layer 305 can use identical material, it would however also be possible to employ different materials.When using different materials, the hardness of material can also be different, and the electrode layer for example fitted with human body skin can be conductive fabric or electric silica gel, so it is easy to fit with human body skin, and outermost electrode layer can be scale copper, due to scale copper hardness preferably, it can play a supporting role.When using identical material, the first positive electrode layer 301 and the second positive electrode layer 305 can be separately provided, and can also form (referring to Fig. 5 (a)) by the bending of same positive electrode layer.
First flexible dielectric layer 302 and the electrode of the second flexible dielectric layer 304 are resiliency compressible high polymer material, such as foamed polymer, polyurethane, silicon rubber, thermoplastic elastomer (TPE).First flexible dielectric layer 302 and the second flexible dielectric layer 304 typically use identical material, but are not excluded for the situation using different materials.
The present embodiment is transformed traditional pressure-volume sensor from structure, by the single capacitor structure of original bipolar electrode layer, single-dielectric-layer, is transformed into double capacitive stack structures of three electrode layers, dual dielectric layer.In the present embodiment, positive electrode layer is shared in two electric capacity, those skilled in the art know that two electric capacity can also share positive electrode layer in the present embodiment.
Pressure capacitance type sensor mainly weighs the pressure value for putting on sensor surface by detecting the changing value of electric capacity, and capacitance variations depend primarily on the change of pole plate spacing.The calculation formula of the capacitance variations value of each single capacitor structure is as follows：
Wherein, ε is the dielectric constant of dielectric medium, and A is electrode plate suqare, C0For the initial value of electric capacity, d0For the initial pole plate spacing of electric capacity, Δ d is pole plate spacing changing value.
After capacitive stack structure of modification by the present invention, for double capacitive stack structures, the calculation formula of capacitance variations value is as follows：
Wherein, C0For the initial value of the first layer capacitance, d0For the initial pole plate spacing of the first layer capacitance, Δ d0For first layer capacitor plate spacing changing value, C1For the initial value of the second layer capacitance, d1For the initial pole plate spacing of the second layer capacitance, Δ d1For second layer capacitor plate spacing changing value.
When the initial value of the first layer capacitance and the second layer capacitance is equal, initial pole plate spacing is equal, and Δ d0=Δ d1During=Δ d：
Therefore, when the dielectric and constant physical characteristic of elastic fluid material, the deformation of pressure-volume sensor proposed by the present invention at the same pressure is twice of single-sensor, and now, sensitivity accordingly brings up to original twice.Simultaneously as the integral compressible space increase of sensor, this expands the range of sensor to a certain extent.
Embodiment 2：
Such as Fig. 4 (a) and the top view and profile for shown in 4 (b) being respectively another capacitance type touch sensor proposed by the present invention.The capacitance type touch sensor includes the following each layers set gradually：First publicly publicly electrode layer 405 of electrode layer 401, the first flexible dielectric layer 402, sensor array layer 403, the second flexible dielectric layer 404 and second.
Wherein, first publicly electrode layer 401 and second publicly electrode layer 405 respectively from shown in Fig. 4 (b) both sides up and down cover sensor array layer 403 all the sensors array region, and first publicly electrode layer 401 with second publicly electrode layer 405 turn on.First publicly electrode layer 401 and second publicly electrode layer 405 include conductive materials, the material such as copper foil, conduction cloth, electric silica gel or flexible circuit.
Each sensor sensing point of sensor array layer 403 is drawn out to connector 407 by respective wire 406, is ultimately connected to capacitance detecting chips pin.Can also sensor sensing point be directly connected on flexible PCB with capacitance detecting chips, it is not necessary to be drawn out to connector.The implementation of sensor array layer 403 can be flexible circuit, can be the fexible film for scribbling conductive ink, it might even be possible to be the cloth woven together by conductive fiber and normal cloth.Wherein, each array element of sensor array layer is also conductive materials, such as the pad of copper sheet, conductive ink or flexible PCB.
First flexible dielectric layer 402 and the electrode of the second flexible dielectric layer 404 are resiliency compressible high polymer material, such as foamed polymer, polyurethane, silicon rubber and thermoplastic elastomer (TPE).
The touch sensor of the present embodiment is also the laminated body, capacitor structure of three electrode layers, dual dielectric layer, by a pressure sensitive point for constituting touch sensor in the form of a laminate, when there is pressure pressing in sensor surface, the battery lead plate spacing of two electric capacity changes simultaneously, and equivalent to two electric capacity are together in parallel.The touch sensor that the present embodiment is proposed with embodiment 1 has same technique effect.As different from Example 1, the touch sensor structure of the present embodiment is more suitable for using with the collocation of single electrode capacitance sensing chip, can reduce circuit cost, and be easier to make and produce.
Embodiment 3：
As Fig. 5 (a) and Fig. 5 (b) show the profile of two kinds of extended modes based on embodiment 1.
Capacitance type touch sensor shown in Fig. 5 (a) includes the first positive electrode layer 501, the first flexible dielectric layer 502, public positive electrode layer 503, the second flexible dielectric layer 504, the second positive electrode layer 505, the 3rd flexible dielectric layer 506, public positive electrode layer 503 and public cathode conductor 507 and the public positive wire 508 set gradually.In this extended mode, two layers of public positive electrode layer 503 is formed by same public positive electrode layer bending.
Capacitance type touch sensor shown in Fig. 5 (b) includes public positive electrode layer 509, the first flexible dielectric layer 510, the first positive electrode layer 511, the second flexible dielectric layer 512, public positive electrode layer 509, the 3rd flexible dielectric layer 513, the second positive electrode layer 514, the 4th flexible dielectric layer 515, public positive electrode layer 509 and public cathode conductor 517 and the public positive wire 516 set gradually.In this extended mode, three layers of public positive electrode layer 509 are that repeatedly bending is formed by same public positive electrode layer.
The mode of two kinds of increase laminations is only exemplarily provided in the present embodiment, mainly for fairly setting out double capacitive stack structures that the laminated construction of the present invention is not limited to three electrodes, dual dielectric layer, it can continue to increase layer number, the four capacitive stack structures shown in three capacitive stack structures, Fig. 5 (b) for example, shown in Fig. 5 (a).Calculation formula for the capacitance variations value of n-layer electric capacity is as follows：
Wherein, CiFor the initial value of the i-th layer capacitance, diFor the initial pole plate spacing of the i-th layer capacitance, Δ diFor the i-th layer capacitance pole plate spacing changing value, n is the number of plies of electric capacity.
The mode of lamination, which recommends to connect negative pole (or earth polar), internal layer by outer layer, to be connect positive pole and is defined, because outer layer generally contacts human body, human body and circuit can be played a part of altogether to shield electromagnetic interference, but it is not excluded that outer layer connects the situation that positive pole, internal layer connect negative pole (or region), when simply outer layer connects positive pole, safeguard procedures or shielding means need to be increased.
Content as hereinbefore is repeated no more in the present embodiment.
Embodiment 4：
As Fig. 6 (a) and Fig. 6 (b) show a kind of schematic diagram of extended mode based on embodiment 2.
Publicly electrode layer 601 that capacitance type touch sensor shown in Fig. 6 (a) includes setting gradually, the first flexible dielectric layer 602, first sensor array layer 603, publicly the second flexible dielectric layer 604, electrode layer 601, the 3rd flexible dielectric layer 605, second sensor array layer 606, the 4th flexible dielectric layer 607 and publicly electrode layer 601.
Wherein, first sensor array layer 603 and second sensor array layer 606 are located at same position, up and down corresponding sensor sensing point short circuit two-by-two, shown in such as Fig. 6 (b).Shorting stub 608 is connected or the short circuit on the circuit board for be integrated with capacitance detecting chips at sensors edges.Publicly electrode layer 601 is a monoblock flexible conducting material, such as conductive fabric, copper foil or electric silica gel.Present embodiment illustrates the example that publicly electrode layer shares same ground electrode layer, it can also be separately provided as the aforementioned.
The extended mode of the present embodiment and the extended mode difference of embodiment 3 are that the electric capacity number of plies that the present embodiment is expanded again is 2N, and N is the positive integer more than 1, such as 4 layers shown in Fig. 6；And the electric capacity number of plies that embodiment 3 is expanded again is M, M is the positive integer more than 2, such as 3 layers shown in Fig. 5 (a), 4 layers shown in Fig. 5 (b).Other contents as hereinbefore are repeated no more in the present embodiment.
Embodiment 5：
The present embodiment adds prolongation structure on the basis of embodiment 4, and the prolongation structure includes flexible dielectric layer, sensor array layer, flexible dielectric layer and the publicly electrode layer set gradually；Flexible dielectric layer on the outside of prolongation structure close to first publicly electrode layer set, or close to second publicly electrode layer set.
The prolongation structure can be further added by the basis of said structure, and the outermost publicly electrode layer of flexible dielectric layer close to current sensor construction in increased prolongation structure positioned at outside is set.
Other contents as hereinbefore are repeated no more in the present embodiment.
In addition, the outermost layer of the capacitance type touch sensor in the various embodiments described above may also set up screen layer or insulating barrier.
It is pointed out that embodiment of the present invention is only to schematically illustrate, quantity, material, distribution form and the circuit realiration of sensor are not intended to limit.Any capacitance type touch sensor, as long as employing laminated type capacitance detecting thought, the row in the scope of protection of the invention.
Claims (10)
1. a kind of capacitance type touch sensor, it is characterised in that the capacitance type touch sensor at least includes the first A set gradually
Type electrode layer, the first flexible dielectric layer, the first Type B electrode layer, the second flexible dielectric layer and the 2nd A type electrode layers；A types electricity
Extremely positive electrode when, Type B electrode be negative electrode；When A types electrode is negative electrode, Type B is positive electrode；
Wherein, the first A types electrode layer and the 2nd A type electrode layers are parallel to each other, and with the first Type B electrode layer square crossing
Set；The respective column short circuit of first A types electrode layer and the 2nd A type electrode layers is simultaneously individually drawn by wire, the first Type B electrode layer
Often row individually drawn by wire；
First A types electrode layer, the 2nd A types electrode layer and the first Type B electrode layer include conductive materials；
The electrode of first flexible dielectric layer and the second flexible dielectric layer is elastic compressible material.
2. capacitance type touch sensor according to claim 1, it is characterised in that the capacitance type touch sensor is also wrapped
The first expansion structure is included, first expansion structure includes the flexible dielectric layer and Type B electrode layer set gradually；
First expansion structure is set close to the first A types electrode layer or the 2nd A types electrode layer.
3. capacitance type touch sensor according to claim 1 or 2, it is characterised in that the capacitance type touch sensor
Also include the second expansion structure, second expansion structure includes the 3rd flexible dielectric layer set gradually, Type B electrode layer, the 4th
Flexible dielectric layer and A type electrode layers；
The A type electrode layers of second expansion structure close to the first A types electrode layer, the 2nd A types electrode layer or the first expansion structure are set
Put.
4. capacitance type touch sensor according to claim 3, it is characterised in that second prolongation structure is one or many
It is individual；When the second prolongation structure for it is multiple when, be located in the second prolongation structure the flexible dielectric layer in outside close to the first A types electrode layer,
The A types electrode layer of 2nd A types electrode layer or another second expansion structure is set.
5. capacitance type touch sensor according to any one of claim 1 to 4, it is characterised in that each Type B electrode layer
It is separately provided, or is bent to form by same Type B electrode layer.
6. capacitance type touch sensor according to any one of claim 1 to 5, it is characterised in that each A types electrode layer
It is separately provided, or is bent to form by same A types electrode layer.
7. a kind of capacitance type touch sensor, it is characterised in that it is first public that the capacitance type touch sensor includes setting gradually
The publicly electrode layer of ground electrode layer, the first flexible dielectric layer, first sensor array layer, the second flexible dielectric layer and second；
Wherein, first publicly electrode layer and second publicly electrode layer respectively from both sides covering first sensor array layer up and down
All the sensors array region, and the first publicly electrode layer and the second publicly electrode layer conducting；First publicly electrode layer and
Second publicly electrode layer be conductive materials；
The electrode of first flexible dielectric layer and the second flexible dielectric layer is elastic compressible material.
8. capacitance type touch sensor according to claim 7, it is characterised in that capacitance type touch sensor also includes opening up
Open up structure, flexible dielectric layer that the prolongation structure includes setting gradually, sensor array layer, flexible dielectric layer and publicly electric
Pole layer；Flexible dielectric layer on the outside of prolongation structure close to first publicly electrode layer set, or close to the second publicly electrode layer
Set；
Wherein, each sensor array layer is located at same position, each corresponding sensor sensing point short circuit.
9. capacitance type touch sensor according to claim 8, it is characterised in that the prolongation structure is one or more；
When prolongation structure for it is multiple when, the flexible dielectric layer in outside is located in prolongation structure close to the second publicly electrode layer, first public
The publicly electrode layer of ground electrode layer or another prolongation structure is set.
10. the capacitance type touch sensor according to any one of claim 7 to 9, it is characterised in that each public ground electrode
Layer is separately provided, or is bent to form by same publicly electrode layer.
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| CN108731850A (en) * | 2018-07-25 | 2018-11-02 | 汉王科技股份有限公司 | Capacitance pressure transducer, and electronic pen |
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| CN111238694A (en) * | 2020-02-06 | 2020-06-05 | 腾讯科技（深圳）有限公司 | Touch sensor, touch event detection method and device and intelligent robot |
| CN113074843A (en) * | 2021-03-31 | 2021-07-06 | 华中科技大学 | Multifunctional planar capacitive flexible sensor and preparation method thereof |
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| CN113939724A (en) * | 2019-01-30 | 2022-01-14 | 海维动力控股有限公司 | Stretchable bidirectional capacitive pressure sensor and use method thereof |
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