CN105806517A - Pressure sensor - Google Patents
Pressure sensor Download PDFInfo
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- CN105806517A CN105806517A CN201610291026.5A CN201610291026A CN105806517A CN 105806517 A CN105806517 A CN 105806517A CN 201610291026 A CN201610291026 A CN 201610291026A CN 105806517 A CN105806517 A CN 105806517A
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- Prior art keywords
- pressure transducer
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- conductive layer
- insulating barrier
- layer
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Classifications
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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
- G01L1/142—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 using capacitors
-
- 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
- G01L1/04—Measuring force or stress, in general by measuring elastic deformation of gauges, e.g. of springs
Abstract
The invention provides a pressure sensor.The pressure sensor comprises an upper conducting layer, a lower conducting layer and an insulating layer arranged between the upper electrode layer and the lower electrode layer, wherein multiple through holes are formed in the insulating layer.
Description
Technical field
It relates to a kind of pressure transducer, particularly relate to a kind of large area pressure transducer.
Background technology
Pressure transducer is a kind of very important functional part, is that one experiences external pressure information by sensing element, and is converted into the device of the signal of telecommunication.Traditionally, the difference according to operation principle, pressure transducer is generally divided into piezoelectric type, pressure resistance type and condenser type three types.The sensing element of traditional capacitance pressure transducer is mainly the capacitor being made up of sensitive thin film and parallel pole.When being subject to ambient pressure effect, capacitor sensitive thin film can deform, and realizes the detection of pressure size thereby through the capacitance variations measured between its parallel pole.The advantages such as this characteristic sensor is simple in construction, it is low to consume energy, highly sensitive, stable.
Present electronics wearable device increased popularity.Pressure transducer as its important composition parts is had higher requirement by electronics wearable device, it is desirable to have response speed, higher sensitivity, better bendability and more comfortable wearing faster to experience.Sensitivity for response speed and Geng Gao faster, people are typically selected to have the insulant of high elastic deformation degree, in order to when being subject to less pressure, it is thus achieved that bigger deformation, thus producing bigger capacitance change, thus improve response speed and sensitivity.But, the degree of deformation of insulant is limited after all, it is difficult to the raising of sensitivity is had bigger help.Pressure drag material in wirking pressure sensor is frequently squeezed, it is easy to expendable damage occur.In addition, owing to wearable device typically requires the large-area pressure transducer of comparison, and conventional condenser pressure transducer needs to print elargol on insulation film as conductive layer (electrode), therefore, the technics comparing difficulty of large area printing conducting resinl, once occur that printing is uneven, will appear from the consequence that electric conductivity is bad.
Summary of the invention
For this, present disclose provides one need not brush conducting resinl on the insulating material, and the capacitance pressure transducer of the insulant of bigger elastic deformation can be provided.A kind of pressure transducer according to the disclosure, including: go up conductive layer, lower conductiving layer and be arranged in the insulating barrier between affiliated upper electrode layer and lower electrode layer, wherein said insulating barrier is formed multiple through hole.
Pressure transducer according to the disclosure, described upper conductive layer and described lower conductiving layer are carbon fiber or copper fiber conductive fabric.Described insulating barrier is a kind of REINFORCED PET thin film, and wherein said through hole is formed by punching.
Pressure transducer according to the disclosure, also include described insulating barrier and described on conductive layer and the lower conductiving layer atresia insulating barrier between each.Described atresia insulating barrier is a kind of REINFORCED PET thin film.
Pressure transducer according to the disclosure, also includes the outside REINFORCED PET thin film being close to the outside of each of described upper conductive layer and lower conducting shell.
Pressure transducer according to the disclosure has the elastic insulating layer of through hole owing to have employed, in particular by the REINFORCED PET thin film with through hole, therefore, when pressure transducer is under pressure effect, due in REINFORCED PET thin film through hole be present such that upper and lower conductive layers produces bigger deflection, so that the capacitance variation amount of the capacitor of this pressure transducer increases, thus significantly improving the sensitivity of pressure transducer.Owing to PET film has good resistance to deformation characteristic, in its elastic deformation section, its deformation is recoverable, therefore has life-span advantage.According further to the pressure transducer of the disclosure on cost also advantageously, conventional pressure sensor needs to print elargol on insulation film as conductive layer, the disclosure is not limited to low resistivity material, and need not adhere on insulation film by conductive layer, therefore can be selected for the such as carbon fiber of low cost, the lower cost materials such as copper fiber.
Accompanying drawing explanation
Accompanying drawing herein is merged in description and constitutes the part of this specification, it is shown that meets and embodiment of the disclosure, and for explaining the principle of the disclosure together with description.
Shown in Fig. 1 is the schematic diagram of the pressure transducer according to the disclosure.
Shown in Fig. 2 is the sectional view when being under pressure effect of the pressure transducer according to the disclosure.
Shown in Fig. 3 A and 3B is the circuit diagram of the pressure transducer according to the disclosure；
Shown in Fig. 4 be pressure transducer according to the disclosure the arrangement schematic diagram of punching of insulating barrier.
Shown in Fig. 5 is the installation preparation process schematic diagram of the pressure transducer according to the disclosure.
Detailed description of the invention
Here in detail exemplary embodiment being illustrated, its example representation is in the accompanying drawings.When as explained below relates to accompanying drawing, unless otherwise indicated, the same numbers in different accompanying drawings represents same or analogous key element.Embodiment described in following exemplary embodiment does not represent all embodiments consistent with the disclosure.On the contrary, they only with in appended claims describe in detail, the disclosure some in the example of consistent apparatus and method.
The term used in the disclosure is only merely for the purpose describing specific embodiment, and is not intended to be limiting and originally opens." one ", " described " and " being somebody's turn to do " of the singulative used in disclosure and the accompanying claims book is also intended to include most form, unless context clearly shows that other implications.It is also understood that term "and/or" used herein refers to and comprises any or all of one or more project of listing being associated and be likely to combination.
Although should be appreciated that and be likely to adopt term first, second, third, etc. to describe various information in the disclosure, but these information should not necessarily be limited by these terms.These terms are only used for being distinguished from each other out same type of information.Such as, without departing from the scope of this disclosure, the first conductive layer can also be referred to as the second conductive layer, and similarly, the second conductive layer can also be referred to as the first conductive layer.Depend on linguistic context, word as used in this " if " can be construed to " ... time " or " when ... " or " in response to determining ".
In order to make those skilled in the art be more fully understood that the disclosure, below in conjunction with the drawings and specific embodiments, the disclosure is described in further detail.
Shown in Fig. 1 is the schematic diagram of the pressure transducer according to the disclosure.As it is shown in figure 1, the pressure transducer according to the disclosure, it is made up of with the first relative conductive layer 20 parallel to each other and the second conductive layer 30 insulating barrier 10.Described conductive layer 20 and 30 is transparent carbon fiber or copper fiber conductive fabric.By the structure of the disclosure, conductive layer integral part of in conventional pressure sensor and insulating barrier are provided separately, say, that the pressure transducer of the disclosure not be used on insulation film brush conducting resinl as conductive layer, but adopt independent conductive layer, namely the disclosure is independent by conductive layer.Therefore, the ripe products such as conductive fabric can be used, and in theory, the area of this pressure transducer can be infinitely great.Traditionally, the conductive layer of capacitance pressure transducer adopts the mode of brush conducting resinl on the insulating layer to be formed.Its area of conductive layer that the mode of this conventional brush conducting resinl is formed is restricted, it is impossible to form the conductive layer of larger area.Because the technics comparing difficulty of large area printing conducting resinl, once occur that printing is uneven, will appear from electric conductivity bad.The structure that the insulating barrier of the disclosure and conductive layer are provided separately adopts transparent carbon fiber or copper fiber conductive fabric as conductive layer, then eliminate the defect that can not form large area conductive layer in traditional handicraft.Therefore, when needs large area pressure transducer, comparing traditional sensors according to the pressure transducer of the disclosure more has cost advantage and manufacturing process advantage.
Insulating barrier 10 is a kind of REINFORCED PET thin film.In order to increase conductive layer deformation extent when being subject to extraneous pressure each other, the sensor of the disclosure is formed with some through holes 40 by punch pattern in this insulating barrier 10.Owing to the insulating barrier 10 of the capacitance pressure transducer of the disclosure adopts the insulating barrier with through-hole structure, therefore, compared with the insulating barrier not having through hole, under identical pressure effect, there is the insulating barrier deformation extent of through hole apparently higher than the insulating barrier not having through hole, therefore, cause that the capacitance change between conductive layer 20 and 30 becomes apparent from, this adds increased the described capacitance pressure transducer sensitivity to pressure.Being additionally, since the existence of through hole, the deformation extent that conductive layer produces under pressure increases, and therefore also increases the pressure limit of the hypersensitivity of described capacitance pressure transducer.
Therefore, owing to the pressure transducer according to the disclosure can manufacture big surface pressure sensor, pressure transducer according to the disclosure can apply to mattress, DDR mattress, and the human body that so can apply on mattress detects and be applied to the carpet of dancing machine to sense the button that foot is stepped at bed.
Selectively, between each of described insulating barrier 10 and conductive layer 20 and 30, it is provided with another layer of atresia insulating barrier 50 and 60, such as REINFORCED PET thin film.Owing at the PET film outer wrapping atresia insulating barrier that insulate, therefore improve the creep resistance of insulation film, formed and there is creep resistance elastic construction.
Additionally, in order to be applied to various uses, it is necessary to respectively mount one layer of outer insulation 70 and 80 in the outside of conductive layer 20 and 30.This outer insulation 70 and 80 can be REINFORCED PET thin film.
In general, the molding thickness including the pressure transducer of all composition layer 10-80 is about between 0.6-1.0 millimeter, thickness be 0.8 millimeter preferably.
Shown in Fig. 2 is the deformation process sectional view when being under pressure effect of the pressure transducer according to the disclosure.As in figure 2 it is shown, pressure transducer be under pressure effect time, the first conductive layer 20 (being alternatively referred to as conductive layer) is extruded to lower conductiving layer 30 (being alternatively referred to as lower conductiving layer).Owing to insulating barrier 10 is squeezed and elastic deformation, thus causing that the distance d between conductive layer 20 and 30 reduces.Due to the existence of the punching 40 in insulating barrier 10, therefore, at the same pressure, causing that conductive layer 20 is further towards lower conductiving layer 30, therefore the distance d between conductive layer 20 and 30 further reduces.
For example, in actual use, when being placed on by the sensor of disclosure structure in a chair cushion, as nobody on chair, now sensor not pressurized, the distance of the conduction interlayer being positioned at circular punching two ends in sensor is maximum.When people is sitting on chair, circular punching two ends are squeezed, simultaneously because punching place is a cavity body, then the distance between the conductive layer at two ends will shorten, and the capacitance being now equivalent to two conduction interlayers formation becomes big.
Shown in Fig. 3 A and 3B is the principle electrical circuit schematic diagram of capacitance pressure transducer.As shown in figs.3 a and 3b, CxFor the electric capacity that two conductive layers of pressure transducer are constituted, CxTwo pin correspondence Fig. 1 and 2 in two " carbon fiber or conductive fabrics ".Wherein, A end is pumping signal input, and B end is signal output.L1 in Fig. 3 B is inducer.Fig. 3 B uses LC resonance principle to measure electric capacity.Owing to this circuit is clearer, those skilled in the art can be clearly understood that its structure and principle by circuit diagram, is not therefore further explained at this.
Capacitance pressure transducer according to the disclosure by being converted into capacitance change by pressure variety, and passes through measure capacitance change and then obtain pressure variety, it is achieved pressure detecting.Equation below gives the situation that capacitance changes (change of the distance between conductive layer 20 and 30) with pressure:
In above-mentioned formula, dielectric constant vacuum εr=1, k is electrostatic force constant, and S is that two conductive layer right opposites amass, and d is the distance of two conduction interlayers.In the disclosure, medium is PET and air, and in above-mentioned formula, d is the variable with pressure correlation, and all the other are constant.According to this formula, the area of this pressure transducer can be infinitely great in theory.When needs large area pressure transducer, comparing traditional sensors according to the pressure transducer of the disclosure more has cost advantage and manufacturing process advantage.
Shown in Fig. 4 is the arrangement schematic diagram of the punching of the insulating barrier according to the disclosure.As shown in Figure 4, the line interlacing that is punching on insulating barrier 10 arranges, it is also possible to parallel arranged, but the spacing between punching is equal.Or other arrangement modes can also be adopted, as long as punching is evenly distributed on the insulating layer.The shape of punching can be circular, oval, star-like, square etc..Distance between adjacent two holes that it may be noted that is between 0.1-3 millimeter, for instance, 0.1,0.5,1,2,3 millimeters.The diameter of usual punching is approximately 0.2-4 centimetre, for instance 0.2,0.4,0.6,0.8,1,2,3,4 centimetres.
Shown in Fig. 5 is the installation preparation process schematic diagram of the pressure transducer according to the disclosure.As it is shown in figure 5, first, each layer material constituting sensor is carried out cutting stock, for instance, cutting insulating barrier (S505), cutting PET insulation film (S510), and cutting conductive layer (S515).Existing technique is adopted to be punched out insulating barrier 10 being processed to form insulating barrier through hole 40 (S520) subsequently.In step S525 place, cut PET insulation film, including for the PET insulation film 50 of isolated insulation layer 10 and conductive layer 20 and 30 and 60 and the PET insulation film 70 and 80 of outside of parcel conductive layer.Place's conductive layer 20 and 30 is cut in step S530 place.Finally, size is met each stratified material of designing requirement mode combination layer shown in Fig. 1 and 2 and forces together (S535).Finally produced product is packaged (S540).
It will be apparent that the pressure sensor structure according to the disclosure is simple, it is simple to processing, production.As explained above, very simple according to the processing technology of the pressure transducer of the disclosure, in manufacturability, it is better than existing other kinds of pressure transducer.Particularly in manufacturing process eliminates conductive layer painting process, hence it is evident that improve production environment.Especially needed it is pointed out that, conventional pressure sensor needs to print elargol on insulation film as conductive layer, the disclosure is not limited to low resistivity material, and need not adhere on insulation film, therefore can be selected for the lower cost materials such as the such as carbon fiber of low cost, copper fiber.Certainly, such as Graphene is adopted can to obtain better Detection results as conductive layer.Obviously, the material used is highly developed at present PET film, carbon fiber or conductive fabric, it is simple to obtains, thus also reduces the cost of product.
In a word, pressure transducer according to the disclosure has the elastic insulating layer of through hole owing to have employed, in particular by the REINFORCED PET thin film with through hole, therefore, when pressure transducer is under pressure effect, due in REINFORCED PET thin film through hole be present such that upper and lower conductive layers produces bigger deflection, thus, the capacitance variation amount making the capacitor of this pressure transducer increases, thus significantly improving the sensitivity of pressure transducer.Owing to PET film has good resistance to deformation characteristic, in its elastic deformation section, its deformation is recoverable, therefore has life-span advantage.According further to the pressure transducer of the disclosure on cost also advantageously, conventional pressure sensor needs to print elargol on insulation film as conductive layer, the disclosure is not limited to low resistivity material, and need not adhere on insulation film by conductive layer, therefore can be selected for the such as carbon fiber of low cost, the lower cost materials such as copper fiber.
The ultimate principle of the disclosure is described above in association with specific embodiment, but, it is to be noted, for those of ordinary skill in the art, it will be appreciated that whole or any steps of disclosed method and device or parts, can in any calculation element (including processor, storage medium etc.) or the network of calculation element, being realized with hardware, firmware, software or their combination, this is that those of ordinary skill in the art use their basic programming skill can be achieved with when the explanation having read the disclosure.
Therefore, the purpose of the disclosure can also be realized by one program of operation or batch processing on any calculation element.Described calculation element can be known fexible unit.Therefore, the purpose of the disclosure can also only by providing the program product comprising the program code realizing described method or device to realize.It is to say, such program product also constitutes the disclosure, and storage has the storage medium of such program product also to constitute the disclosure.Obviously, described storage medium can be any known storage medium or any storage medium developed in the future.
It may also be noted that in the apparatus and method of the disclosure, it is clear that each parts or each step can decompose and/or reconfigure.These decompose and/or reconfigure the equivalents that should be regarded as the disclosure.Further, the step performing above-mentioned series of processes can order naturally following the instructions perform in chronological order, but is not required to necessarily perform sequentially in time.Some step can perform parallel or independently of one another.
Above-mentioned detailed description of the invention, is not intended that the restriction to disclosure protection domain.Those skilled in the art are it is to be understood that depend on designing requirement and other factors, it is possible to various amendment, combination, sub-portfolio and replacement occur.The amendment made within any spirit in the disclosure and principle, equivalent replacement and improvement etc., should be included within disclosure protection domain.
Claims (6)
1. a pressure transducer, including: go up conductive layer, lower conductiving layer and be arranged in the insulating barrier between affiliated upper electrode layer and lower electrode layer, wherein said insulating barrier is formed multiple through hole.
2. pressure transducer according to claim 1, wherein said insulating barrier is a kind of REINFORCED PET thin film, and wherein said through hole is formed by punching.
3. pressure transducer according to claim 1, also includes: described insulating barrier and described on conductive layer and the lower conductiving layer atresia insulating barrier between each.
4. pressure transducer according to claim 3, wherein said atresia insulating barrier is a kind of REINFORCED PET thin film.
5. the pressure transducer according to claim 1 or 4, also includes: be close to the outside REINFORCED PET thin film in the outside of each of described upper conductive layer and lower conducting shell.
6. pressure transducer according to claim 1, pressure transducer according to claim 1, wherein said upper conductive layer and described lower conductiving layer are carbon fiber or copper fiber conductive fabric.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610291026.5A CN105806517A (en) | 2016-05-04 | 2016-05-04 | Pressure sensor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610291026.5A CN105806517A (en) | 2016-05-04 | 2016-05-04 | Pressure sensor |
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| CN105806517A true CN105806517A (en) | 2016-07-27 |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109025971A (en) * | 2018-04-28 | 2018-12-18 | 中国石油天然气股份有限公司 | Drilling pressure detection device and its diaphragm applied force mechanism |
| CN109724724A (en) * | 2018-12-27 | 2019-05-07 | 武汉飞帛丝科技有限公司 | Pressure distributed flexible sensor and preparation method thereof |
| CN109724723A (en) * | 2018-12-27 | 2019-05-07 | 武汉飞帛丝科技有限公司 | Wearable pressure sensor of textile material base and preparation method thereof |
| CN110418947A (en) * | 2017-03-01 | 2019-11-05 | 罗杰斯公司 | Lamination sensor device and its manufacturing method |
| TWI693049B (en) * | 2017-11-20 | 2020-05-11 | 仁寶電腦工業股份有限公司 | Floor mat structure and floor mat assembly |
| CN111307342A (en) * | 2020-04-08 | 2020-06-19 | 深圳大学 | High-temperature-resistant flexible pressure sensor and preparation method and application thereof |
| CN112690980A (en) * | 2021-01-21 | 2021-04-23 | 无锡市儿童医院 | Portable sterilizing box for dressing change |
| CN113332519A (en) * | 2021-06-29 | 2021-09-03 | 武汉大学 | Insulin pen storage box |
| CN115190246A (en) * | 2022-08-01 | 2022-10-14 | 维沃移动通信有限公司 | Imaging device and electronic apparatus |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110418947A (en) * | 2017-03-01 | 2019-11-05 | 罗杰斯公司 | Lamination sensor device and its manufacturing method |
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| CN113332519A (en) * | 2021-06-29 | 2021-09-03 | 武汉大学 | Insulin pen storage box |
| CN115190246A (en) * | 2022-08-01 | 2022-10-14 | 维沃移动通信有限公司 | Imaging device and electronic apparatus |
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Application publication date: 20160727 |