CN111129789A - Variable circuit and electronic device - Google Patents

Abstract

Translated fromChinese

本发明提供一种可变电路及电子器件，涉及电学技术领域。本发明提供的可变电路包括工作线路以及可变线路，所述可变线路与所述工作线路串联或者并联，所述可变线路包括低熔点金属以及外界刺激液体可溶解的材料，在接触外界刺激液体后，所述可变线路的电学状态改变。本发明的技术方案能够在接触外界刺激液体时，改变自身的工作状态，以直观地确定可变电路是否接触外界刺激液体。

The invention provides a variable circuit and an electronic device, which relate to the technical field of electricity. The variable circuit provided by the present invention includes a working circuit and a variable circuit, the variable circuit is connected in series or in parallel with the working circuit, and the variable circuit includes a low melting point metal and a material soluble in an external stimulus liquid. After stimulation of the liquid, the electrical state of the variable circuit changes. The technical scheme of the present invention can change its own working state when it contacts with the external stimulation liquid, so as to intuitively determine whether the variable circuit is in contact with the external stimulation liquid.

Description

Variable circuit and electronic device

Technical Field

The invention relates to the technical field of electricity, in particular to a variable circuit and an electronic device.

Background

Various products (such as circuits) have certain applicable environments, when the products are separated from the applicable environments, such as products sensitive to external stimulation liquid, the quality of the products can be greatly changed or even completely unavailable after contacting the external stimulation liquid (such as water, acid solution or alkali solution, etc.), but the products are not easily perceived when the appearance is not greatly changed. Therefore, there is a need for a circuit that can intuitively determine whether a product sensitive to an external stimulation liquid is in contact with the external stimulation liquid.

Disclosure of Invention

The invention provides a variable circuit and an electronic device, which can change the working state of the variable circuit when contacting with external stimulation liquid so as to intuitively determine whether the variable circuit contacts with the external stimulation liquid.

In a first aspect, the present invention provides a variable circuit, which adopts the following technical scheme:

the variable circuit comprises a working line and a variable line, the variable line is connected with the working line in series or in parallel, the variable line comprises a low-melting-point metal and a material soluble by an external stimulation liquid, and the electrical state of the variable line is changed after the variable line is contacted with the external stimulation liquid.

Optionally, the variable circuit is made of a microcapsule, a core of the microcapsule is made of a low-melting-point metal in a room-temperature liquid state, and a wall of the microcapsule is made of an insulating material which can be dissolved by the external stimulation liquid; when the capsule wall of the microcapsule is dissolved, the low-melting-point metal of the capsule core is electrically connected with the working circuit.

Optionally, the variable line includes a substrate and a plurality of microcapsules, the microcapsules are located on one surface of the substrate, a magnet is disposed on the other surface of the substrate, a perpendicular projection of the magnet on a plane where the substrate is located covers an area where the microcapsules are located, a capsule core of the microcapsules includes a low-melting-point metal in a room-temperature liquid state and a magnetic filler doped in the low-melting-point metal, and a capsule wall of the microcapsules is made of an insulating material and is soluble by an external stimulation liquid.

Optionally, the external stimulation liquid is an acid solution, and the capsule wall of the microcapsule is made of one or more of sodium alginate, chitosan, ethyl cellulose and cyclodextrin; or the external stimulation liquid is an alkali solution, and the capsule wall of the microcapsule is made of one or more of stearate, glycerate and succinate.

Optionally, the external stimulation liquid is an acid solution or an alkali solution, the variable line is made of a low-melting-point metal in a room-temperature liquid state, and the external stimulation liquid can dissolve an oxide coated outside the low-melting-point metal.

Optionally, the external stimulation liquid is an acid solution, and the variable line includes a low-melting-point metal in a room-temperature liquid state and active metal particles doped in the low-melting-point metal, and the active metal particles can react with the acid solution.

Optionally, the external stimulation liquid comprises water, the variable circuit comprises a substrate and a room-temperature liquid low-melting-point metal positioned on the substrate, and an acid or an alkali which can be dissolved in water is arranged on the substrate; the solution formed by dissolving the acid or the alkali in water can dissolve the oxide coated outside the low-melting-point metal.

Optionally, the substrate is a non-woven fabric or test paper, and sodium hydroxide, calcium hydroxide, barium hydroxide, succinic acid, lactic acid, malic acid, salicylic acid, oleic acid, linoleic acid, oxalic acid, citric acid, stearic acid, or acetic acid is disposed on the substrate.

Optionally, the working line comprises a low melting point metal that is solid at room temperature.

In a second aspect, the present invention provides an electronic device, which adopts the following technical solutions:

the electronic device includes a chip, and the variable circuit of any one of the above, the working line being connected to the chip.

Optionally, the working line is an antenna; or at least one electronic component is connected in the working circuit.

In a third aspect, the present invention provides an electronic device, which adopts the following technical scheme:

the electronic device comprises a substrate, a chip and an antenna, wherein the chip and the antenna are positioned on one side of the substrate, the antenna is connected with the chip, the electronic device further comprises a shielding pattern, the vertical projection of the shielding pattern on the substrate at least covers the chip, and the shielding pattern comprises a low-melting-point metal and a material which can be dissolved by external stimulation liquid.

Optionally, the material in the shielding pattern, in which the external stimulation liquid is soluble, is an oxide coated on the low melting point metal.

Optionally, the material in the shielding pattern, in which the external stimulation liquid is soluble, is active metal particles, and the active metal particles can react with the acid solution.

Optionally, the material in the shielding pattern, in which the external stimulation liquid is soluble, is active metal particles, the external stimulation liquid includes water, and the base material is provided with a water-soluble acid.

The invention provides a variable circuit and an electronic device, wherein the variable circuit comprises a working circuit and a variable circuit, the variable circuit is connected with the working circuit in series or in parallel, the variable circuit comprises low-melting-point metal and a material which can be dissolved by external stimulation liquid, and after the variable circuit is contacted with the external stimulation liquid, the electrical state of the variable circuit is changed, so that the working state of the variable circuit is changed, and whether the variable circuit is contacted with the external stimulation liquid or not can be visually determined.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a first schematic diagram of a variable circuit according to an embodiment of the present invention;

FIG. 2 is a second schematic diagram of a variable circuit according to an embodiment of the present invention;

fig. 3 is a first schematic structural diagram of a variable line according to an embodiment of the present invention;

fig. 4 is a second schematic structural diagram of a variable line according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a variable line according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a variable line according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of a variable line according to an embodiment of the present invention;

FIG. 8 is a first schematic structural diagram of an electronic device according to an embodiment of the present invention;

fig. 9 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that the technical features in the embodiments of the present invention may be combined with each other without conflict.

Specifically, as shown in fig. 1 and fig. 2, fig. 1 is a first schematic diagram of a variable circuit provided in an embodiment of the present invention, and fig. 2 is a second schematic diagram of a variable circuit provided in an embodiment of the present invention, where the variable circuit includes aworking line 1 and avariable line 2, thevariable line 2 is connected in series or in parallel with theworking line 1, and thevariable line 2 includes a material in which a low melting point metal and an external stimulation liquid are soluble, and after contacting the external stimulation liquid, an electrical state of thevariable line 2 changes, that is, thevariable line 2 changes from on to off, or thevariable line 2 changes from off to on.

Unless otherwise specified, the melting point of the low melting point metal in the embodiment of the present invention is below 300 ℃, and it may be a simple substance, an alloy, or a mixture including a simple substance and/or an alloy.

In addition, the number of theworking lines 1 and thevariable lines 2 included in the variable circuit is not limited above, that is, the variable circuit may include only oneworking line 1 and onevariable line 2, or the variable circuit includes oneworking line 1 and a plurality ofvariable lines 2, or the variable circuit includes a plurality ofworking lines 1 and onevariable line 2, or the variable circuit includes a plurality ofworking lines 1 and a plurality ofvariable lines 2. When the variable circuit includes a plurality ofvariable lines 2, eachvariable line 2 and theworking line 1 may be connected in series, in parallel, or in both series and parallel, and those skilled in the art may select the variable line according to actual needs.

Optionally, theworking line 1 includes a low-melting-point metal that is solid at room temperature, so that theworking line 1 can be manufactured by various methods such as printing, spraying, printing, transferring and the like, and theworking line 1 has good conductivity. Of course, the workingcircuit 1 may also comprise various fillers to improve the performance of theworking circuit 1, which the skilled person can select according to the actual needs.

It should be noted that, for the variable line provided in the embodiment of the present invention, when theworking line 1 and thevariable line 2 both include low-melting-point metals, it is preferable that the types of elements in the low-melting-point metals included in the two are the same, so as to improve compatibility between the two. The specific materials of the above low melting point metals can be reasonably selected by those skilled in the art according to actual needs, and are not described herein again.

In the example shown in fig. 1, thevariable line 2 is connected in parallel with theworking line 1, and for example, when thevariable line 2 is not in contact with the external stimulation liquid, thevariable line 2 is turned on and then turned off, thevariable line 1 is connected with a power supply and a light emitting device, when thevariable line 2 is not in contact with the external stimulation liquid, theworking line 1 is short-circuited by thevariable line 2, no current flows through theworking line 1, the light emitting device does not emit light, when thevariable line 2 is in contact with the external stimulation liquid, thevariable line 2 is turned off, and the current flows through theworking line 1, and the light.

In the example shown in fig. 2, thevariable line 2 is connected in series with theworking line 1, and for example, when thevariable line 2 is not in contact with the external stimulation liquid, it is turned on, and when it is in contact with the external stimulation liquid, it is turned off, and when it is not in contact with the external stimulation liquid, thevariable line 2 is connected with theworking line 1, and both theworking line 1 and thevariable line 2 have current flowing therethrough, and the light emitting device emits light, and when it is in contact with the external stimulation liquid, thevariable line 2 is turned off, and both theworking line 1 and thevariable line 2 have no current flowing therethrough, and the light emitting device does not emit light.

Because the variable circuit comprises theworking circuit 1 and thevariable circuit 2, thevariable circuit 2 is connected with theworking circuit 1 in series or in parallel, thevariable circuit 2 comprises low-melting-point metal and a material which can be dissolved by external stimulation liquid, and after the variable circuit is contacted with the external stimulation liquid, the electrical state of thevariable circuit 2 is changed, so that the working state of the variable circuit is changed, and whether the variable circuit is contacted with the external stimulation liquid or not can be intuitively determined.

Specifically, when thevariable line 2 includes a low melting point metal and a material in which an external stimulus liquid is soluble, the specific implementation manner thereof may be various, and the following embodiment of the present invention is exemplified.

In a first implementation manner, as shown in fig. 3, fig. 3 is a schematic structural diagram of a variable circuit according to an embodiment of the present invention, that is, a material of thevariable circuit 2 is a microcapsule, acore 21 of the microcapsule is a low-melting-point metal in a room temperature liquid state, and awall 22 of the microcapsule is an insulating material that can be dissolved by an external stimulation liquid; when thewall 22 of the microcapsule is dissolved, the low-melting metal of thecore 21 is electrically connected with theworking circuit 1. When the external stimulation liquid is not contacted, the conductive low-melting-point metal at thecapsule core 21 is surrounded by theinsulating capsule wall 22 and is insulated from each other, so that thevariable circuit 2 is in a disconnected state, after the external stimulation liquid is contacted, thecapsule wall 22 is dissolved by the external stimulation liquid, and further the low-melting-point metal in a room-temperature liquid state at thecapsule core 21 is released, and the low-melting-point metal is mutually connected and distributed in the wholevariable circuit 2, so that thevariable circuit 2 is in a connected state.

In a second implementation manner, as shown in fig. 4, fig. 4 is a schematic structural diagram of a variable circuit provided in an embodiment of the present invention, thevariable circuit 2 includes asubstrate 23 and a plurality of microcapsules, the microcapsules are located on one surface of the substrate, amagnet 24 is disposed on the other surface of thesubstrate 23, a perpendicular projection of themagnet 24 on a plane where thesubstrate 23 is located covers an area where the microcapsules are located, acore 21 of the microcapsule includes a low-melting-point metal in a room-temperature liquid state and a magnetic filler doped in the low-melting-point metal, and awall 22 of the microcapsule is made of an insulating material and is soluble by an external stimulation liquid. When the liquid is not in contact with the external stimulation liquid, the conductive low-melting-point metal at thecapsule core 21 is surrounded by theinsulating capsule wall 22 and insulated from each other, so that thevariable circuit 2 is in a disconnected state, and after the liquid is in contact with the external stimulation liquid, thecapsule wall 22 is dissolved by the external stimulation liquid, so that the low-melting-point metal in a room-temperature liquid state at thecapsule core 21 is released, and under the action of the attraction force of themagnet 24, even if the surface tension of the low-melting-point metal is large, the low-melting-point metal can be well distributed in the wholevariable circuit 2, so that thevariable circuit 2 is in a connected state. Optionally, the magnetic filler comprises one or more of ferrite, neodymium iron boron, iron alloy and the like.

In the above two implementations, the material of thewall 22 of the microcapsule is selected according to the type of the external stimulation liquid, so that the wall can be dissolved by the external stimulation liquid. Optionally, the external stimulation liquid is an acid solution, thecapsule wall 22 of the microcapsule is made of one or more of sodium alginate, chitosan, ethyl cellulose and cyclodextrin, and the acid solution also reacts with the oxide in the low-melting-point metal to remove the oxide, reduce the surface tension of the low-melting-point metal, and help to connect the released low-melting-point metals with each other. Or, the external stimulation liquid is an alkali solution, and thecapsule wall 22 of the microcapsule is made of one or more of stearate, glycerate and succinate.

In a third implementation manner, as shown in fig. 5, fig. 5 is a schematic structural diagram of a variable circuit provided in the embodiment of the present invention, thevariable circuit 2 is made of a low-melting-point metal in a room-temperature liquid state, and is suitable for an external stimulation liquid which is an acid solution or an alkali solution and can dissolve an oxide coated outside the low-melting-point metal. When thevariable circuit 2 is not contacted with external stimulation liquid, the low-melting-point metal is coated with the oxide, the viscosity of the oxide is extremely high, the low-melting-point metal is mutually connected and distributed in the wholevariable circuit 2, thevariable circuit 2 is in a conducting state, after the variable circuit is contacted with the external stimulation liquid, the oxide coated outside the low-melting-point metal is dissolved, the low-melting-point metal inside is released, the low-melting-point metal inside is gathered into small balls due to the extremely high surface tension and is not contacted with each other, thevariable circuit 2 is in a disconnected state, and when the thickness of the low-melting-point metal is smaller than 200 micrometers, the phenomenon is more obvious.

In a fourth implementation manner, as shown in fig. 6, fig. 6 is a schematic structural diagram of a variable line provided in the embodiment of the present invention, thevariable line 2 includes a low-melting-point metal in a room-temperature liquid state and active metal particles doped in the low-melting-point metal, and the external stimulation liquid is an acid solution, and the external stimulation liquid can dissolve oxides and the active metal particles coated outside the low-melting-point metal, and the active metal particles can react with the acid solution. When thevariable circuit 2 is not contacted with external stimulation liquid, the low-melting-point metal is coated with the oxide, the viscosity of the oxide is extremely high, the low-melting-point metal is mutually connected and distributed in the wholevariable circuit 2, thevariable circuit 2 is in a conducting state, after the variable circuit is contacted with the external stimulation liquid, the oxide coated outside the low-melting-point metal and the active metal particles are dissolved, on one hand, the low-melting-point metal is gathered into small balls without being contacted with each other due to the extremely high surface tension of the released low-melting-point metal, on the other hand, the volume of thevariable circuit 2 is reduced due to the consumption of the active metal particles, and thevariable circuit 2 is in a disconnected state.

Optionally, the active metal particles are zinc particles, magnesium particles, or aluminum particles. The mass fraction of active metal particles in thevariable line 2 is between 5% and 30%, for example 5%, 10%, 15%, 20%, 25%, 30%, so that the viscosity of the material from which thevariable line 2 is made is not too high for easy manufacturing and the volume reduction due to the consumption of active metal particles in thevariable line 2 is significant. The particle size of the active metal particles is 1 nm-100 μm, so that the active metal particles are easier to be uniformly distributed in the low-melting metal and easier to be prepared.

In a fifth implementation manner, as shown in fig. 7, fig. 7 is a schematic structural diagram of a variable line provided in an embodiment of the present invention, where thevariable line 2 includes asubstrate 25 and a low-melting-point metal in a room-temperature liquid state on thesubstrate 25, an acid or an alkali that is soluble in water is disposed on thesubstrate 25, and a solution formed by dissolving the acid or the alkali in water can dissolve an oxide coated outside the low-melting-point metal, and is suitable for an external stimulation liquid including water. When thevariable circuit 2 is not contacted with the external stimulation liquid, the low-melting-point metal is coated with the oxide, the viscosity of the oxide is extremely high, the low-melting-point metal is mutually connected and distributed on thewhole substrate 25, thevariable circuit 2 is in a conducting state, after the variable circuit is contacted with the external stimulation liquid, the acid or alkali in thesubstrate 25 is dissolved in the water in the external stimulation liquid to form an acid solution or an alkali solution, the acid solution or the alkali solution dissolves the oxide coated outside the low-melting-point metal and releases the internal low-melting-point metal, and the low-melting-point metal is converged into small balls without being contacted with each other due to the extremely high surface tension of the released low-melting-point metal, so that thevariable circuit 2 is in a disconnected state.

Preferably, of both thesubstrate 25 and the low melting point metal, thesubstrate 25 is located on a side more easily contacted with the external stimulus liquid to increase the sensitivity of thevariable line 2 to the external stimulus liquid.

Optionally, thesubstrate 25 is a non-woven fabric or test paper, so that thesubstrate 25 has good flexibility, which is beneficial to preparing a flexible variable circuit, and an acid or an alkali can be arranged on thesubstrate 25 through the steps of soaking and drying, so that the process is simple. Optionally, sodium hydroxide, calcium hydroxide, barium hydroxide, succinic acid, lactic acid, malic acid, salicylic acid, oleic acid, linoleic acid, oxalic acid, citric acid, stearic acid, or acetic acid is provided on the substrate, and it is further preferable that none of the above substances is toxic or harmless.

In addition, the variable circuit in the embodiment of the present invention may further include an encapsulation film covering the workingline 1 and thevariable line 2 to protect the workingline 1 and thevariable line 2. Optionally, a plurality of water permeable holes are provided on the packaging film at positions corresponding to thevariable lines 2, so that the external stimulation liquid can better contact thevariable lines 2.

The variable circuit in the embodiments of the present invention may have various applications, which are exemplified below.

Illustratively, the variable circuit in the embodiment of the invention is applied to an intelligent diaper and can be used for urine wetness detection, urine serves as external stimulation liquid, and the urine contacts the variable circuit in the variable circuit to change the electrical state of the variable circuit, so that the purpose of detecting urine wetness is achieved. Taking the variable circuit shown in fig. 1 as an example, thevariable circuit 2 is connected in parallel with the workingcircuit 1, taking the case that thevariable circuit 2 is turned on when not contacting urine and turned off when contacting urine as an example, a power supply and a light emitting device are connected to the workingcircuit 1, when not wetting urine, thevariable circuit 2 short-circuits the workingcircuit 1, no current flows through the workingcircuit 1, the light emitting device does not emit light, when wetting urine, thevariable circuit 2 is turned off, and the current flows through the workingcircuit 1, and the light emitting device emits light.

The variable circuit in the embodiment of the present invention is exemplarily applied to a Frequency Selective Surface (FSS), and specifically, the variable circuit is connected to patterns distributed in a matrix in the frequency selective Surface, and whether the variable circuit contacts external stimulation liquid or not is used to control a connection manner of the patterns in the frequency selective Surface, so that the frequency selective Surface realizes frequency selection.

Exemplarily, the variable circuit is applied to an electronic device, specifically, as shown in fig. 8, fig. 8 is a schematic structural diagram of an electronic device provided by an embodiment of the present invention, where the electronic device includes achip 3 and the variable circuit described in any of the above. Before and after the electronic device is contacted with the external stimulation liquid, the electrical state of thevariable circuit 2 in the variable circuit is changed, so that the working state of the electronic device is changed, and whether the electronic device is contacted with the external stimulation liquid or not can be timely and accurately determined.

Alternatively, as shown in fig. 8, the workingcircuit 1 is an antenna, and in this case, the electronic device may be an RFID or the like including an antenna and a chip.

If thevariable circuit 2 is connected in series with the workingcircuit 1, thevariable circuit 2 is connected when not contacting with the external stimulation liquid, and is disconnected after contacting with the external stimulation liquid, for example, before contacting with the external stimulation liquid, thevariable circuit 2 is connected, the antenna can normally work, the electronic device can be identified, and after contacting with the external stimulation liquid, thevariable circuit 2 is disconnected, the antenna can not normally work, and the electronic device can not be identified.

If thevariable circuit 2 is connected with the workingcircuit 1 in parallel, thevariable circuit 2 is still conducted when not contacting with the external stimulation liquid, and is disconnected after contacting with the external stimulation liquid, for example, before contacting with the external stimulation liquid, thevariable circuit 2 is conducted, the antenna is short-circuited, the antenna cannot normally work, the electronic device cannot be identified, and after contacting with the external stimulation liquid, thevariable circuit 2 is disconnected, the antenna can normally work, and the electronic device can be identified.

If thevariable circuit 2 is connected with the workingcircuit 1 in series, thevariable circuit 2 is disconnected when not contacting with the external stimulation liquid, and is connected after contacting with the external stimulation liquid, for example, before contacting with the external stimulation liquid, thevariable circuit 2 is disconnected, the antenna can not work normally, the electronic device can not be identified, after contacting with the external stimulation liquid, thevariable circuit 2 is connected, the antenna can work normally, and the electronic device can be identified.

If thevariable circuit 2 is connected in parallel with the workingcircuit 1, thevariable circuit 2 is still disconnected when not contacting with the external stimulation liquid, and is connected after contacting with the external stimulation liquid, for example, before contacting with the external stimulation liquid, thevariable circuit 2 is disconnected, the antenna can normally work, the electronic device can be identified, after contacting with the external stimulation liquid, thevariable circuit 2 is connected, the antenna is short-circuited, the antenna cannot normally work, and the electronic device cannot be identified.

Optionally, at least one electronic element is connected to the workingcircuit 1, and the electronic element may be a resistor, a light emitting device, a buzzer, or the like. The working states before and after contacting the external stimulation fluid can be known from the aforementioned fig. 1 and fig. 2, and will not be described herein again.

Exemplarily, the variable circuit is applied to an electronic device, specifically, as shown in fig. 9, fig. 9 is a schematic structural diagram of the electronic device according to the embodiment of the present invention, where the electronic device includes a substrate (not shown in the figure), achip 4 and anantenna 5 located on one side of the substrate, theantenna 5 is connected to thechip 4, the electronic device further includes ashielding pattern 6, a vertical projection of theshielding pattern 6 on the substrate at least covers thechip 4, and the shielding pattern includes a low melting point metal and a material in which an external stimulation liquid is soluble.

Before contacting external stimulation liquid, because shieldingpattern 6's shielding effect, shelter from the signal forantenna 5 among the electronic device can't normally work, and electronic device can't normally work, after contacting external stimulation liquid, because shielding pattern includes low melting point metal and the material that external stimulation liquid is soluble, make low melting point metal among the shielding pattern assemble into a ball one by one, can't shelter from the signal,antenna 5 among the electronic device can normally work, and electronic device can normally work and switch on.

Alternatively, the material in theshielding pattern 6 in which the external stimulation liquid is soluble is an oxide coated on the low melting point metal, and the oxide can react with the acid solution or the alkali solution, which is suitable for the case where the external stimulation liquid is the acid solution or the alkali solution, and also suitable for the case where the external stimulation liquid includes water and the base material is provided with the water-soluble acid or alkali.

Optionally, the material in theshielding pattern 6 in which the external stimulation liquid is soluble is an active metal particle, and the active metal particle can react with an acid solution, which is suitable for the case that the external stimulation liquid is an acid solution, and is also suitable for the case that the external stimulation liquid includes water and the base material is provided with the water-soluble acid.

The embodiment of the invention provides a variable circuit and an electronic device, wherein the variable circuit comprises a workingcircuit 1 and avariable circuit 2, thevariable circuit 2 is connected with the workingcircuit 1 in series or in parallel, thevariable circuit 2 comprises low-melting-point metal and a material which can be dissolved by external stimulation liquid, and after the variable circuit is contacted with the external stimulation liquid, the electrical state of thevariable circuit 2 is changed, so that the working state of the variable circuit is changed, and whether the variable circuit is contacted with the external stimulation liquid or not can be visually determined.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. A variable circuit comprising a working line and a variable line connected in series or in parallel with the working line, the variable line comprising a low melting point metal and a material soluble in an external stimulus liquid, the variable line changing in electrical state upon contact with the external stimulus liquid.

2. The variable circuit according to claim 1, wherein the variable circuit is made of a microcapsule, a core of the microcapsule is made of a low-melting-point metal in a room-temperature liquid state, and a wall of the microcapsule is made of an insulating material that is soluble in the external stimulus liquid; when the capsule wall of the microcapsule is dissolved, the low-melting-point metal of the capsule core is electrically connected with the working circuit.

3. The variable circuit of claim 2, wherein the external stimulus liquid is an acid solution or an alkali solution;

when the external stimulation liquid is an acid solution, the capsule wall of the microcapsule is made of one or more of sodium alginate, chitosan, ethyl cellulose and cyclodextrin;

when the external stimulation liquid is an alkali solution, the capsule wall of the microcapsule is made of one or more of stearate, glycerate and succinate.

4. The variable circuit according to claim 1, wherein the external stimulation liquid is an acid solution or an alkali solution, the variable circuit is made of a low-melting-point metal in a room-temperature liquid state, and the external stimulation liquid can dissolve an oxide coated outside the low-melting-point metal.

5. The variable circuit of claim 1, wherein the external stimulation liquid comprises water, the variable circuit comprises a substrate and a low-melting-point metal in a room-temperature liquid state on the substrate, and an acid or a base soluble in water is disposed on the substrate; the solution formed by dissolving the acid or the alkali in water can dissolve the oxide coated outside the low-melting-point metal.

6. The variable circuit of claim 5, wherein the substrate is a non-woven fabric or a test paper, and sodium hydroxide, calcium hydroxide, barium hydroxide, succinic acid, lactic acid, malic acid, salicylic acid, oleic acid, linoleic acid, oxalic acid, citric acid, stearic acid, or acetic acid is disposed on the substrate.

7. The variable circuit of any of claims 1 to 6, wherein the working line comprises a low melting point metal that is solid at room temperature.

8. An electronic device comprising a chip and the variable circuit according to any one of claims 1 to 7, wherein the operating line is connected to the chip.

9. The electronic device of claim 8, wherein the working circuit is an antenna; or at least one electronic component is connected in the working circuit.

10. An electronic device, comprising a substrate, a chip on one side of the substrate, and an antenna connected to the chip, wherein the electronic device further comprises a shielding pattern, a vertical projection of the shielding pattern on the substrate at least covers the chip, and the shielding pattern comprises a low melting point metal and a material soluble to an external stimulus liquid.

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