CN102001617A - Displacement loading device and method for flexible electronic device - Google Patents

Abstract

The invention relates to a displacement loading device and a displacement loading method for a flexible electronic device, and belongs to the technical fields of engineering materials, structural deformation and mechanical experiment equipment. The device comprises a bracket, a guide rail, two identical square iron blocks, a spring, two wires and a direct-current power supply, wherein one square iron block moves along the guide rail, and the other square iron block is fixed on the guide rail; the sections of the two square iron blocks are square and have the same area; the two ends of the spring are fixed on the two square iron blocks respectively; the two wires are wound on the two square iron blocks in the same turning direction and with the same number of turns, and are connected with the direct-current power supply respectively; and the two square iron blocks are provided with a fixture respectively. The high-accuracy displacement control of a thin film structure, a microscale beam structure and the like in the flexible electronic device is realized through direct current with high control accuracy, so that the defects caused by machining accuracy limitation on a mechanical loading device, and temperature control limitation and thermal expansion coefficient measurement accuracy limitation on a thermal strain loading device are overcome.

Description

A kind of flexible electronic device displacement charger and method

Technical field

The present invention relates to a kind of flexible electronic device displacement charger and method, belong to engineering material, structural deformation and Experiments of Machanics equipment technical field.

Background technology

In the flexible electronic device technology, often need carry out high displacement control accuracy to some structures (as film, minute yardstick beam).At present, implement such and load, for example use screw mechanism to rotatablely move and be converted to rectilinear motion often by means of mechanical means; Perhaps use the thermal strain means, for example less film test piece and the thickness substrate big and that coefficient of thermal expansion is bigger of coefficient of thermal expansion bonds together, and it is bigger to change the distortion that takes place owing to substrate after the temperature, will drive film test piece obviously distortion takes place.But, along with development of technology, the characteristic size of flexible electronic device is more and more littler, required precision to displacement control is also more and more higher, and machinery loading device is subjected to the restriction of machined precision, the thermal strain charger is limited by the accuracy of temperature control and thermal coefficient of expansion measurement, and the deficiency so the loading accuracy of the two seems all the more demands developing new displacement charger and method urgently.

Summary of the invention

The purpose of this invention is to provide a kind of flexible electronic device displacement charger and method, make it can be to flexible electronic device, particularly the less flexible electronic device of physical dimension realizes that displacement loads.

Technical scheme of the present invention is as follows:

A kind of flexible electronic device displacement charger is characterized in that: this device comprises support, guide rail, the first square iron block, the second square iron block, spring, first lead, second lead and dc source; Guide rail is fixed on the support; One in the first square iron block and the second square iron block is moved along guide rail, and another is fixed on the guide rail; The cross section of the first square iron block and the second square iron block is square, and area equates; The two ends of spring are separately fixed on the first square iron block and the second square iron block; First lead and second lead respectively with same around to being wound on the first square iron block and the second square iron block with the identical number of turn, and be connected with dc source respectively; On the first square iron block and the second square iron block, be respectively equipped with first anchor clamps and second anchor clamps that are used for the clamping flexible electronic device.

A kind of flexible electronic device displacement loading method provided by the invention is characterized in that this method comprises the steps:

1) utilize first anchor clamps and second anchor clamps that flexible electronic device to be loaded is clamped on the first square iron block and the second square iron block, record spring length L at this moment ₀

2) in first lead and second lead, feed DC current, the flexible electronic device movable terminal is subjected to displacement; If the displacement of flexible electronic device movable terminal is Δ L, the spring length after the loading is L, then L=L ₀+ Δ L, if Δ L＞0 then need feed the opposite DC current of direction in first lead and second lead, size is:

$I=\frac{{\mathrm{<figure-callout\; id="2"\; label="L"\; filenames="HSA00000287557600011.png"\; state="\{\{state\}\}">L</figure-callout>}}^2}{{\mathrm{<figure-callout\; id="2"\; label="Na"\; filenames="HSA00000287557600011.png"\; state="\{\{state\}\}">Na</figure-callout>}}^2}\sqrt{\frac{2\mathrm{\&pi;k}(L-L_0)}{3{\mathrm{\&mu;}}_0{\mathrm{\&mu;}}_r}}$

If Δ L＜0, then need in first lead and second lead, feed the identical DC current of direction, size is:

$I=\frac{{\mathrm{<figure-callout\; id="2"\; label="L"\; filenames="HSA00000287557600011.png"\; state="\{\{state\}\}">L</figure-callout>}}^2}{{\mathrm{<figure-callout\; id="2"\; label="Na"\; filenames="HSA00000287557600011.png"\; state="\{\{state\}\}">Na</figure-callout>}}^2}\sqrt{\frac{2\mathrm{\&pi;k}(L_0-L)}{3{\mathrm{\&mu;}}_0{\mathrm{\&mu;}}_r}}$

In above-mentioned two formulas, a is the cross section length of side of the first square iron block and the second square iron block, and N is the number of turn that lead twines on square iron block, μ ₀Be space permeability, μ _rBe the relative permeability of iron block material, k is the stiffness factor of spring.

The present invention compared with prior art, have the following advantages and the high-lighting effect: the present invention utilizes the higher DC current of control accuracy, realized structures such as the film in the flexible electronic device, minute yardstick beam are carried out high precision displacement control, be subjected to restriction, the thermal strain charger of machined precision to be limited by the defective that temperature is controlled and the accuracy of thermal coefficient of expansion measurement is brought thereby overcome machinery loading device.

Description of drawings

Fig. 1 is apparatus of the present invention schematic diagrames.

Among the figure: 1-support, 2-guide rail, the 3a-first square iron block, the 3b-second square iron block, 4a-first anchor clamps, 4b-second anchor clamps, 5-flexible electronic device, 6-spring, 7a-first lead, 7b-second lead, 8-dc source.

The specific embodiment

Further specify concrete structure of the present invention, operation principle, the course of work below in conjunction with accompanying drawing, but should not limit protection scope of the present invention with this.

Fig. 1 is the structural representation of the present invention's a kind of flexible electronic device displacement charger and method, it is characterized in that: this device comprises support 1, guide rail 2, the first square iron block 3a, the second square iron block 3b, spring 6, the first lead 7a, the second lead 7b and dc source 8; Guide rail 2 is fixed on the support 1; Among the first square iron block 3a and the second square iron block 3b one moves along guide rail 2, and another is fixed on the guide rail 2; The cross section of the first square iron block 3a and the second square iron block 3b is square, and area equates; The two ends of spring are separately fixed on the first square iron block 3a and the second square iron block 3b; The first lead 7a and the second lead 7b respectively with same around to being wound on the first square iron block 3a and the second square iron block 3b with the identical number of turn, and be connected with dc source 8 respectively; On the first square iron block 3a and the second square iron block 3b, be respectively equipped with the first anchor clamps 4a and the second anchor clamps 4b that is used for the clamping flexible electronic device.

Utilize the present invention can realize a kind of flexible electronic device displacement loading method, it is characterized in that this method comprises the steps:

1). utilize the first anchor clamps 4a and the second anchor clamps 4b that flexible electronic device to be loaded 5 is clamped on the first square iron block 3a and the second square iron block 3b, record spring length L at this moment ₀

2). in the first lead 7a and the second lead 7b, feed DC current, flexible electronic device is subjected to displacement; If displacement is Δ L, the spring length after the loading is L, then L=L ₀+ Δ L;

Distance between the first square iron block 3a and the second square iron block 3b is L, and signal generator 8 passes to size when being the constant current of I for the first lead 7a and the second lead 7b, if the first lead 7a is identical with the sense of current among the second lead 7b, then produce attraction between two square iron blocks, obtain the second square iron block 3b according to the knowledge of general physics and be the active force of the first square iron block 3a:

$F_{\mathrm{attractive}}=-\frac{2{\mathrm{\&mu;}}_0{\mathrm{\&mu;}}_r{N}^2{\mathrm{<figure-callout\; id="2"\; label="I"\; filenames="HSA00000287557600011.png"\; state="\{\{state\}\}">I</figure-callout>}}^2}{\mathrm{\&pi;}}\frac{3}{4}\frac{a^4}{L^4}$ ①

If the current opposite in direction among the first lead 7a and the second lead 7b then produces repulsive force between them, obtain the second square iron block 3b according to the knowledge of general physics and be the active force of the first square iron block 3a:

$F_{\mathrm{repulsive}}=\frac{2{\mathrm{\&mu;}}_0{\mathrm{\&mu;}}_r{N}^2{\mathrm{<figure-callout\; id="2"\; label="I"\; filenames="HSA00000287557600011.png"\; state="\{\{state\}\}">I</figure-callout>}}^2}{\mathrm{\&pi;}}\frac{3}{4}\frac{a^4}{L^4}$ ②

In formula (a) and the formula (b), F _AitracttveMagnetic force between＜0 expression first square iron block 3a and the second square iron block 3b is an attraction, F _RepulsiveMagnetic force between＞0 expression first square iron block 3a and the second square iron block 3b is a repulsive force;

The power that spring imposes on the first square iron block 3a is:

F _spring＝-k(L-L ₀) ③

F in the formula (c) _Spring＞0 expression spring pressurized, F _Spring＜0 expression spring pressurized;

Under poised state, following formula is set up:

F _spring+F _magnetic＝0 ④

If Δ L＞0, then need in the first lead 7a and the second lead 7b, feed the opposite DC current of direction, simultaneous 2., 3. and 4. three formulas is obtained and is needed the size of current of feeding to be:

$I=\frac{{\mathrm{<figure-callout\; id="2"\; label="L"\; filenames="HSA00000287557600011.png"\; state="\{\{state\}\}">L</figure-callout>}}^2}{{\mathrm{<figure-callout\; id="2"\; label="Na"\; filenames="HSA00000287557600011.png"\; state="\{\{state\}\}">Na</figure-callout>}}^2}\sqrt{\frac{2\mathrm{\&pi;k}(L-L_0)}{3{\mathrm{\&mu;}}_0{\mathrm{\&mu;}}_{\mathrm{<figure-callout\; id="5"\; label="r"\; filenames="HSA00000287557600011.png"\; state="\{\{state\}\}">r</figure-callout>}}}}$ ⑤

If Δ L＜0, then need in the first lead 7a and the second lead 7b, feed the identical DC current of direction, simultaneous 1., 3. and 4. three formulas is obtained the size of current that needs to feed and is:

$I=\frac{{\mathrm{<figure-callout\; id="2"\; label="L"\; filenames="HSA00000287557600011.png"\; state="\{\{state\}\}">L</figure-callout>}}^2}{{\mathrm{<figure-callout\; id="2"\; label="Na"\; filenames="HSA00000287557600011.png"\; state="\{\{state\}\}">Na</figure-callout>}}^2}\sqrt{\frac{2\mathrm{\&pi;k}(L_0-L)}{3{\mathrm{\&mu;}}_0{\mathrm{\&mu;}}_{\mathrm{<figure-callout\; id="6"\; label="r"\; filenames="HSA00000287557600011.png"\; state="\{\{state\}\}">r</figure-callout>}}}}$ ⑥

Formula 5. with formula 6. in, a is the cross section length of side of the first square iron block and the second square iron block, N is the number of turn that lead twines on square iron block, μ ₀Be space permeability, μ _rBe the relative permeability of iron block material, k is the stiffness factor of spring.

Embodiment:

Consider concrete and attainable situation a: k=10N/m, μ _r=1000, L ₀=0.02m, N=50, a=0.005m, definition strain

Then loading the length L of rear spring and the pass of strain stress is L=L ₀(1+ ε), 5. formula can be written as:

$I=\frac{L_0^2{(1+\mathrm{\&epsiv;})}^2}{{\mathrm{<figure-callout\; id="2"\; label="Na"\; filenames="HSA00000287557600011.png"\; state="\{\{state\}\}">Na</figure-callout>}}^2}\sqrt{\frac{2\mathrm{\&pi;k}{L}_0\mathrm{\&epsiv;}}{3{\mathrm{\&mu;}}_0{\mathrm{\&mu;}}_r}}$ ⑦

If apply ε=1 * 10 ^-5Strain, then according to formula 7. as can be known, the DC current that need feed in the first lead 7a and second lead 7b size is I=0.0185A, this Current Control precision is unusual easy to reach for common dc source.

Claims (2)

1. flexible electronic device displacement charger, it is characterized in that: this device comprises support (1), guide rail (2), the first square iron block (3a), the second square iron block (3b), spring (6), first lead (7a), second lead (7b) and dc source (8); Described guide rail (2) is fixed on the support (1); In the first square iron block (3a) and the second square iron block (3b) one is mobile along guide rail (2), and another is fixed on the guide rail (2); The cross section of the first square iron block (3a) and the second square iron block (3b) is square, and area equates; The two ends of described spring are separately fixed on the first square iron block (3a) and the second square iron block (3b); First lead (7a) and second lead (7b) respectively with same around to being wound on the first square iron block (3a) and the second square iron block (3b) with the identical number of turn, and be connected with dc source (8) respectively; On the first square iron block (3a) and the second square iron block (3b), be respectively equipped with first anchor clamps (4a) and second anchor clamps (4b) that are used for the clamping flexible electronic device.

2. adopt a kind of flexible electronic device displacement loading method of device according to claim 1, it is characterized in that this method comprises the steps:

1) utilize first anchor clamps (4a) and second anchor clamps (4b) that flexible electronic device to be loaded (5) is clamped on the first square iron block (3a) and the second square iron block (3b), and record spring length L at this moment ₀

2) in first lead (7a) and second lead (7b), feed DC current, the flexible electronic device movable terminal is subjected to displacement; If the displacement of flexible electronic device movable terminal is Δ L, the spring length after the loading is L, then L=L ₀+ Δ L, if Δ L＞0 then need feed the opposite DC current of direction in first lead (7a) and second lead (7b), size of current is:

$I=\frac{L^2}{{\mathrm{Na}}^2}\sqrt{\frac{2\mathrm{\&pi;k}(L-L_0)}{3{\mathrm{\&mu;}}_0{\mathrm{\&mu;}}_r}}---\left(a\right)$

If Δ L＜0, then need be in first lead (7a) and second lead (7b) the identical DC current of feeding direction, size of current is:

$I=\frac{L^2}{{\mathrm{Na}}^2}\sqrt{\frac{2\mathrm{\&pi;k}(L_0-L)}{3{\mathrm{\&mu;}}_0{\mathrm{\&mu;}}_r}}---\left(b\right)$

In above-mentioned two formulas, a is the cross section length of side of the first square iron block and the second square iron block, and N is the number of turn that lead twines on square iron block, μ ₀Be space permeability, μ _rBe the relative permeability of iron block material, k is the stiffness factor of spring.

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