CN119004873A - Curved surface micro-nano receptor wire structure and design method thereof - Google Patents
Curved surface micro-nano receptor wire structure and design method thereof Download PDFInfo
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Abstract
本发明涉及柔性电子技术领域，具体涉及一种曲面微纳感受器导线结构及其设计方法，所述导线结构呈蜿蜒状，由若干依次连接的蛇形结构单元构成，所述蛇形结构单元各拐角处具有第一截面尺寸R1，所述蛇形结构单元各拐角之间的连接端处具有第二截面尺寸R2，所述第一截面尺寸R1大于第二截面尺寸R2。本发明通过在单个蛇形结构单元内部做几何补偿来辅助应力释放，可进一步提高导线的延展性与耐用性；在设计过程中考虑周期内应力补偿，同时将柔性基底的应力状态和不同弹性模量也考虑到参数设计中，设计方法能满足特定的柔性应用需求。
The present invention relates to the field of flexible electronic technology, and specifically to a curved micro-nano sensor wire structure and a design method thereof, wherein the wire structure is serpentine and is composed of a plurality of serpentine structural units connected in sequence, wherein each corner of the serpentine structural unit has a first cross-sectional dimension R1, and the connecting end between each corner of the serpentine structural unit has a second cross-sectional dimension R2, and the first cross-sectional dimension R1 is greater than the second cross-sectional dimension R2. The present invention assists stress release by performing geometric compensation inside a single serpentine structural unit, which can further improve the ductility and durability of the wire; during the design process, stress compensation within a cycle is considered, and at the same time, the stress state and different elastic moduli of the flexible substrate are also considered in the parameter design, and the design method can meet specific flexible application requirements.
Description
Technical Field
The invention relates to the technical field of flexible electronics, in particular to a curved micro-nano receptor wire structure and a design method thereof.
Background
Along with the continuous innovative development of the fields of medical electronics, brain-computer interfaces, solar chips, industrial electronics and the like and the continuous improvement of requirements of practical application scenes, the traditional planar electronic devices formed by rigid circuit boards are difficult to meet the practical application requirements, so that flexible electronic technology is generated. Flexible electronics, also known as flex circuits, is a technology that mounts electronic devices on flexible plastic substrates (such as polyimide, polyetheretherketone, or polyethylene terephthalate, etc.) and assembles the electronic circuits using special wire structures. Flexible electronics have very wide applications in industrial, biological, medical, etc. fields due to their unique characteristics of stretchability, deformability, and flexibility.
The "flexibility" of the flexible implantable device is always accompanied by a cyclic process of deformation and resumption in use. In order to prevent mechanical failure such as bending, damage or even breakage between the parts during deformation of the device, the lead wire must be structurally designed to reduce stress concentration, thereby improving durability. To improve the ductility and durability of the wires, the wire structure in the flexible electronic device often adopts a serpentine interconnection wire structure, wherein the self-similar serpentine wire in the serpentine interconnection wire can be stretched in multiple stages.
However, the conventional serpentine interconnection wire adopts a uniform cross-sectional dimension throughout the serpentine routing, and the stress distribution is larger at a place with smaller radius of curvature, so that the stress release cannot be performed adaptively along with the stress distribution by adopting the uniform cross-sectional dimension.
Disclosure of Invention
The invention aims to provide a curved micro-nano receptor wire structure and a design method thereof, wherein geometrical compensation is carried out in a single serpentine structural unit to assist stress release, so that stress concentration can be further reduced, and the ductility and durability of the wire can be improved, so as to solve the problems pointed out in the background art.
The invention is realized by the following technical scheme: the utility model provides a curved surface receives susceptor wire structure a little, the wire structure is the form of winding, comprises a plurality of snakelike structural unit that connect gradually, each corner of snakelike structural unit has first cross-section size R1, the link department between each corner of snakelike structural unit has second cross-section size R2, first cross-section size R1 is greater than second cross-section size R2.
According to a preferred embodiment, the serpentine structural unit is a primary serpentine structural unit.
According to a preferred embodiment, the cross-sectional dimensions of the corners of the serpentine structural element vary in a gradient from one connecting end to the other.
According to a preferred embodiment, the cross-sectional dimension increase gradient from the connection end to the corner of each corner of the serpentine structural element matches the stress increase gradient.
According to a preferred embodiment, the primary serpentine structural unit comprises a 180 ° arc-shaped curved wire in the middle and 90 ° arc-shaped curved wires on both sides, wherein the two end points of the 180 ° arc-shaped curved wire are respectively connected with the first ends of the 90 ° arc-shaped curved wires on both sides;
the corners of the 180 DEG arc-shaped bent wire and the second ends of the 90 DEG arc-shaped bent wire have a first cross-sectional dimension R1, and the two end points of the 180 DEG arc-shaped bent wire have a second cross-sectional dimension R2.
The invention also provides a design method of the curved micro-nano receptor wire structure, which comprises the following steps:
determining a parameter of the second section size R2 and a preset multiple of the parameter of the second section size R2 and the parameter of the first section size R1, and calculating to obtain the parameter of the first section size R1;
Determining the section size increasing gradient, and calculating to obtain a single-step section size increment based on the parameter of the first section size R1 and the section size increasing gradient, wherein the single-step section size increment comprises a single-step section width increment and a single-step section thickness increment;
determining the radius of each arc-shaped bending wire of the primary serpentine structural unit, and drawing a plan view of the primary serpentine structural unit;
And optimizing and adjusting the thickness of the primary serpentine structural unit based on the characteristics and stress state of the substrate material of the curved micro-nano receptor.
According to a preferred embodiment, the method further comprises determining the period of the primary serpentine structural element based on the stress state of the curved micro-nano-susceptor flexible substrate, in particular as follows:
Pre-stretching the flexible substrate subjected to oxygen plasma surface treatment and maintaining the post-treatment process;
Cooling the flexible substrate to room temperature after the post-treatment process, releasing prestretching, and measuring the periodic wrinkling parameters appearing on the surface of the flexible substrate;
and determining the period of the wire structure based on the measured periodic corrugation parameters.
According to a preferred embodiment, the cross-sectional dimension increasing gradient is determined based on a 180 ° arc bend wire end-to-corner strain gradient and a 90 ° arc bend wire first end-to-second end strain gradient.
The technical scheme of the curved surface micro-nano receptor wire structure and the design method thereof provided by the invention has at least the following advantages and beneficial effects: (1) The ductility and durability of the lead can be further improved by performing geometric compensation inside a single serpentine structural element to assist in stress relief; (2) In the design process, periodic internal stress compensation is considered, and meanwhile, the stress state and different elastic moduli of the flexible substrate are also considered in parameter design, so that the design method can meet specific flexible application requirements.
Drawings
Fig. 1 is a schematic structural diagram of a curved micro-nano receptor wire structure provided in embodiment 1 of the present invention;
FIG. 2 is a graph showing the design parameters of the curved micro-nano-susceptor wire structure according to embodiment 2 of the present invention;
FIG. 3 is a schematic drawing showing the pre-stretching of a flexible substrate according to embodiment 2 of the present invention;
FIG. 4 is a schematic view of periodic wrinkles on a surface of a flexible substrate according to embodiment 2 of the present invention;
Icon: 1-primary serpentine structural units.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Example 1
Fig. 1 is a schematic structural diagram of a curved micro-nano receptor wire structure according to an embodiment of the present invention. Referring to fig. 1, the curved micro-nano receptor wire structure is in a serpentine shape and is composed of a plurality of serpentine structural units which are connected in sequence.
Specifically, each corner of the serpentine structure element has a first cross-sectional dimension R1 and each corner of the serpentine structure element has a second cross-sectional dimension R2 at a connecting end, wherein the corners are referred to as a point in the figure and the connecting ends are referred to as b point in the figure.
Considering that the stress distribution should be larger where the radius of curvature is smaller, the present embodiment geometrically compensates inside a single serpentine unit according to the stress distribution, and adjusts the geometry of the serpentine unit to assist in stress relief.
It should be noted that the ductility and durability of the wire can be further improved by geometrically compensating the inside of the single serpentine structural element to assist in stress relief.
In this embodiment, according to ANSYS simulation, it is found that the stress level of the point a is the lowest, the stress of the point b is the largest, and the strain presents the same rule, so that in this embodiment, the stress state of the serpentine structural unit is adjusted by different cross-sectional dimensions, the geometric dimension design is performed by using the first cross-sectional dimension R1 being greater than the second cross-sectional dimension R2, the stress release is performed by using the design with the larger cross-sectional dimension at the point b with the largest stress, and the cross-sectional dimension from the point a to the point b is designed in a gradient change manner, and the gradient of increasing the cross-sectional dimension is also matched with the gradient of increasing the stress.
In one implementation of this embodiment, the serpentine structural unit is a primary serpentine structural unit 1; in the primary serpentine structural unit 1, the cross-sectional dimension from corner to corner at the connection ends between the corners varies in a gradient, and the increasing gradient of the cross-sectional dimension from corner to corner at the connection ends between the corners matches the increasing gradient of the stress.
In particular to this embodiment, the primary serpentine structural unit 1 is designed as follows: the primary serpentine structural unit 1 comprises a 180-degree arc-shaped bending wire at the middle part and 90-degree arc-shaped bending wires at the two sides, wherein the two end points of the 180-degree arc-shaped bending wire are respectively connected with the first ends of the 90-degree arc-shaped bending wires at the two sides; the corners of the 180 ° arc bent wire and the second ends of the 90 ° arc bent wire have a first cross-sectional dimension R1 and the two end points of the 180 ° arc bent wire have a second cross-sectional dimension R2. It should be noted that the foregoing is merely an example, and the parameter of the arc bending may be adjusted according to specific requirements, for example, the middle portion is adjusted to be a 225 ° arc bending wire, and the two sides are 67.5 ° arc bending wires, which is not limited herein.
Example 2
The present embodiment provides a design method of a curved micro-nano receptor wire structure according to embodiment 1 based on the technical scheme provided in embodiment 1, including the following steps:
Step one, determining parameters of the second cross-section dimension R2 and preset multiples of the parameters of the second cross-section dimension R2 and the parameters of the first cross-section dimension R1, and calculating to obtain the parameters of the first cross-section dimension R1.
In the present embodiment, the parameters and the preset times of the second cross-sectional dimension R2 can be directly given, for example, the width of the second cross-sectional dimension R2Setting the preset multiple to be 2.5 times with the thickness of 0.2 mm; it should be noted that, the preset multiple is preferably less than 3, and the stress state of the primary serpentine structural unit 1 is better at this time; in addition, the preset multiple may be larger if it is not limited by space, and is not particularly limited herein.
Given the parameters of the second cross-sectional dimension R2 and the preset multiple, the parameters of the first cross-sectional dimension R1 can be calculated, e.g., the width of the first cross-sectional dimension R1 can be calculated hereThe thickness of the cross section is 0.5mm, and the thickness of the cross section can be calculated in the same way, and the details are not repeated here.
Step two, determining a section size increasing gradient, and calculating to obtain a single-step section size increment based on the parameter of the first section size R1 and the section size increasing gradient; in the present embodiment, when the width of the second cross-sectional dimension R2When the cross-sectional dimension increasing gradient was set to 0.2mm, the value was 11, which is the width at the second cross-sectional dimension R2Simulation and test are carried out when the thickness is set to 0.2mm, and the numerical value is not particularly limited only for the scene; the single step cross-sectional dimension increment includes a single step cross-sectional width increment and a single step cross-sectional thickness increment.
In the present embodiment, the gradient of increase in the cross-sectional dimension of the primary serpentine structural unit 1 is determined based on the strain gradient from the two ends of the 180 ° arc-bent wire to the corner and the strain gradient from the first end to the second end of the 90 ° arc-bent wire, in particular, in the present embodiment, based on the following conditionsDetermining, wherein,Representing a single step stress increment from point a to point b,The maximum stress value at point b is indicated,The stress value at point a is indicated.
Further, based on the width of the first cross-sectional dimension R1And calculating a section size increase gradient to obtain a single-step section width increase, wherein the expression isWhereinRepresenting a single step cross-sectional width increment; similarly, the single step cross-sectional thickness increment is calculated in the same manner, and is not described in detail herein.
Step three, determining the radius of each arc-shaped bending wire of the primary serpentine structural unit 1, and drawing a plan view of the primary serpentine structural unit 1, as shown in fig. 2, wherein the radius R of each arc-shaped bending wire can be determined according to the actual spatial dimension, in one implementation of the embodiment, R is 2.5mm, the first cross-sectional dimension R1 is 0.1×2mm, and the second cross-sectional dimension R2 is 0.25×2mm.
And step four, optimizing and adjusting the thickness of the primary serpentine structural unit 1 based on the material characteristics and stress state of the curved micro-nano receptor flexible substrate, wherein the material characteristics of the curved micro-nano receptor flexible substrate comprise but are not limited to light weight, stretching resistance, corrosion resistance, high temperature resistance, low temperature resistance and the like.
Step five, determining the period of the primary serpentine structural unit 1 based on the stress state of the curved micro-nano receptor flexible substrate。
In one implementation of the embodiment, PDMS is used as the curved micro-nano receptor flexible substrate, the proportion of the PDMS is determined according to the actual application scene, if a larger elastic modulus is needed, the proportion of the curing agent is smaller, the thickness can be controlled by the rotating speed and the spin coating time during spin coating, and then the molding can be performed by combining the conventional curing process at 120 ℃ and 60 Min.
After the flexible substrate is manufactured, oxygen plasma bombardment can be adopted to perform oxygen plasma surface treatment and other modes on the flexible substrate to strengthen the binding force between the interface of the flexible substrate and the coating, and the oxygen plasma bombardment parameters can be selected to be 580W of power, 260ML/Min of flow and 10Min of time.
Pre-stretching the flexible substrate subjected to oxygen plasma surface treatment by 20% and keeping, wherein the parameter before pre-stretching of the flexible substrate is L, and the parameter after pre-stretching is L+L/5 as shown in FIG. 3; further, post-treatment processes, such as film growth in a film coating chamber or photolithographic patterning process, are performed, a layer of material to be coated is deposited on the flexible substrate film layer, and then the flexible substrate film layer is kept warm for 2 hours and cooled to room temperature.
After the post-treatment process, the flexible substrate is cooled to room temperature and the pretension is released, as shown in fig. 4, because the elastic modulus of the PDMS of the flexible substrate is not matched with the elastic modulus of the surface layer plating metal, wrinkles are generated on the surface; and because the materials of the whole upper surface are the same, the points in the stress state are close, so that the folds on the surface are periodic.
Further, a periodic wrinkle parameter occurring on the surface of the flexible substrate is measured, and the period of the wire structure is determined based on the measured periodic wrinkle parameterThe expression is calculated asWherein, the method comprises the steps of, wherein,In order to measure the resulting periodic corrugation parameters,For the pre-stretching amount, the embodiment is 0.2, and can be adjusted according to the actual application scene.
It should be noted that, in the design process, periodic internal stress compensation is considered, and meanwhile, the stress state and different elastic moduli of the flexible substrate are also considered in parameter design, so that the design method can meet specific flexible application requirements.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The utility model provides a curved surface receives susceptor wire structure a little, its characterized in that, the wire structure is the form of a sinuous, comprises a plurality of snakelike structural unit that connect gradually, snakelike structural unit each corner department has first cross-section size R1, the link department between each corner of snakelike structural unit has second cross-section size R2, first cross-section size R1 is greater than second cross-section size R2.
2. The curved micro-nano susceptor wire structure according to claim 1, wherein said serpentine structural unit is a primary serpentine structural unit (1).
3. The curved micro-nano susceptor wire structure according to claim 2, wherein the cross-sectional dimensions of the corners of said serpentine structural element from the connection ends to the corners vary in a gradient.
4. The curved micro-nano susceptor wire structure of claim 3, wherein a cross-sectional dimension increasing gradient from a connection end to a corner between corners of the serpentine structural element matches a stress increasing gradient.
5. The curved micro-nano susceptor wire structure according to any one of claims 2 to 4, wherein said primary serpentine structural unit (1) comprises a central 180 ° curved wire and two side 90 ° curved wires, two end points of said 180 ° curved wire being connected to respective first ends of said two side 90 ° curved wires;
the corners of the 180 DEG arc-shaped bent wire and the second ends of the 90 DEG arc-shaped bent wire have a first cross-sectional dimension R1, and the two end points of the 180 DEG arc-shaped bent wire have a second cross-sectional dimension R2.
6. A method of designing a curved micro-nano-susceptor wire structure according to any one of claims 4 to 5, comprising the steps of:
determining a parameter of the second section size R2 and a preset multiple of the parameter of the second section size R2 and the parameter of the first section size R1, and calculating to obtain the parameter of the first section size R1;
Determining a cross-sectional dimension increasing gradient from a connecting end to a corner of each corner of the serpentine structural unit, and calculating to obtain a single-step cross-sectional dimension increment based on a parameter of a first cross-sectional dimension R1 and the cross-sectional dimension increasing gradient, wherein the single-step cross-sectional dimension increment comprises a single-step cross-sectional width increment and a single-step cross-sectional thickness increment;
Determining the radius of each arc-shaped bending wire of the primary serpentine structural unit (1), and drawing a plan view of the primary serpentine structural unit (1);
and optimizing and adjusting the thickness of the primary serpentine structural unit (1) based on the characteristics and stress state of the substrate material of the curved micro-nano receptor.
7. The method for designing a curved micro-nano susceptor wire structure according to claim 6, wherein the method further comprises determining the period of the primary serpentine structural unit (1) based on the stress state of the curved micro-nano susceptor flexible substrate, in particular as follows:
Pre-stretching the flexible substrate subjected to oxygen plasma surface treatment and maintaining the post-treatment process;
Cooling the flexible substrate to room temperature after the post-treatment process, releasing prestretching, and measuring the periodic wrinkling parameters appearing on the surface of the flexible substrate;
and determining the period of the wire structure based on the measured periodic corrugation parameters.
8. The method of designing a curved micro-nano-susceptor wire structure according to any one of claims 6 to 7, wherein said cross-sectional dimension increasing gradient is determined according to a strain gradient from two ends of a 180 ° arc-bent wire to a corner and a strain gradient from a first end of a 90 ° arc-bent wire to a second end.
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| US20160093685A1 (en) * | 2014-09-30 | 2016-03-31 | Lg Display Co., Ltd. | Flexible display device with bend stress reduction member and manufacturing method for the same |
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