Insulating liquid, high-reliability liquid lens and application thereof

Abstract

The invention provides insulating liquid, a high-reliability liquid lens and application of the high-reliability liquid lens. The insulating liquid comprises an aromatic compound, the aromatic compound has any one or a combination of at least two of structures shown as a formula I, a formula II, a formula III or a formula IV, in the formula I, the formula II, the formula III and the formula IV, R1, R2, R3, R4 and R5 are respectively and independently alkyl with the carbon atom number of 1-20 or aryl with the carbon atom number of 6-10, and X is silicon or germanium. The insulating liquid provided by the invention is high in refractive index and has good photochemical stability, and the high-reliability liquid lens containing the insulating liquid can keep relatively stable performances such as zoom range, delay time and response time in a long-time high-intensity exposure environment.

Description

Technical Field

[0001] The invention belongs to the technical field of lens manufacturing, and in particular relates to an insulating liquid, a high-reliability liquid lens and applications thereof. Background Art

[0002] Liquid lenses have the characteristics of automatic focusing and rapid continuous zooming. Liquid lenses based on the principle of electrowetting usually include two immiscible liquids of equal density, namely conductive liquid and insulating liquid. The two phases of liquid remain in contact and form a meniscus-shaped interface. The shape of the liquid is controlled by applying voltage to cause the meniscus to change, thereby achieving variable focal length. Its zoom range is based on the refractive index difference between the conductive liquid and the insulating liquid. The greater the refractive index difference, the larger the zoom range. The refractive index range of the conductive liquid is ≥1.33, so high refractive index insulating liquid is usually selected to achieve a wide range of zoom for the liquid lens.

[0003] In certain specific application scenarios, liquid lenses need to be in a high-intensity exposure environment for a long time, but the existing liquid lenses have poor temperature and light resistance and cannot remain stable for a long time (≥90 days) in a high-temperature (≥90°C) and high-intensity exposure environment, resulting in failure. This is mainly because conventional high-refractive index insulating liquids have photochemical reaction properties. In a high-intensity long-term exposure environment, the high-refractive index insulating liquid undergoes a photochemical free radical polymerization reaction driven by photon energy, causing the structure to change, resulting in changes in the liquid-liquid / solid-liquid interface tension, which leads to the failure of the liquid lens after a long-term exposure environment, manifested as non-focusing and zooming.

[0004] Therefore, it is necessary to develop an insulating liquid with good light resistance to meet the needs of preparing high-reliability liquid lenses. Summary of the invention

[0005] In view of the shortcomings of the prior art, the present invention aims to provide an insulating liquid, a high-reliability liquid lens and applications thereof. The insulating liquid has a high refractive index and good photochemical stability, and the high-reliability liquid lens containing the insulating liquid can achieve relatively stable performance such as zoom range, hysteresis and response time under long-term high-intensity exposure environment.

[0006] In order to achieve the purpose of the invention, the present invention adopts the following technical solutions:

[0007] In a first aspect, the present invention provides an insulating liquid, wherein the insulating liquid comprises an aromatic compound, wherein the aromatic compound has any one or a combination of at least two of the following structures:

[0008]

[0009] Among them, R1, R2, R3, R4 and R5 are each independently an alkyl group having 1 to 20 carbon atoms (e.g., 2, 4, 6, 8, 10, 12, 14, 16 or 18, etc.) or an aryl group having 6 to 10 carbon atoms (e.g., 7, 8 or 9, etc.), and X is silicon or germanium.

[0010] In the present invention, an aromatic compound having a structure as shown in Formula I and / or Formula II is added to the insulating liquid, and the aromatic compound has the characteristics of high refractive index and good photochemical stability. The high-reliability liquid lens containing the insulating liquid can withstand long-term (≥90 days), high temperature (≥90°C), high-intensity exposure (light intensity of 765W / m 2 ) environment, the performance such as zoom range, hysteresis and response time remain relatively stable, with good reliability.

[0011] Preferably, R1, R2, R3, R4 and R5 are each independently any one of methyl, ethyl, isopropyl, n-propyl, isopropyl, n-butyl, isobutyl or phenyl.

[0012] Preferably, the aromatic compound includes any one of 1-ethylnaphthalene, 2-ethylnaphthalene, 1-isopropylnaphthalene, 2-isopropylnaphthalene, 1-n-butylnaphthalene, 2-n-butylnaphthalene, 1-phenylnaphthalene, 1-naphthyl-1,1,3,3,3-pentamethyldisiloxane, 1-naphthyl-1,1-diethyl-3,3,3-trimethyldisiloxane, 1-naphthyl-1,1,3,3,3-pentamethyldigermane, 1-naphthyl-1,1-diethyl-3,3,3-trimethyldigermane, 1,1,3,3-tetramethyl-1,3-diphenyldisiloxane, 1,3-diethyl-1,3-dimethyl-1,3-diphenyldisiloxane or 1,3-dimethyl-1,1,3,3-tetraphenyldisiloxane, or a combination of at least two thereof.

[0013] Preferably, the insulating liquid further comprises an aliphatic compound.

[0014] Preferably, the aliphatic compound includes any one of an alkane compound, a halogenated hydrocarbon compound, an aliphatic silane compound or an aliphatic germane compound, or a combination of at least two thereof.

[0015] Preferably, the alkane compound includes an alkane compound having 1 to 20 carbon atoms (eg, 2, 4, 6, 8, 10, 12, 14, 16 or 18, etc.).

[0016] Preferably, the alkane compound comprises isododecane (Isopar L) and / or n-hexadecane.

[0017] Preferably, the halogenated hydrocarbon compound includes a halogenated hydrocarbon compound having 1 to 20 carbon atoms (eg, 2, 4, 6, 8, 10, 12, 14, 16 or 18, etc.).

[0018] Preferably, the halogenated hydrocarbon compound comprises perfluorooctane.

[0019] Preferably, the aliphatic silane compound has a structure as shown in Formula 1 and / or Formula 2 below.

[0020]

[0021] In formula 1 and formula 2, R 1 , R 2 , R 3 , R 4 , R 5 and R 6 Each is independently an alkyl group having 1 to 20 carbon atoms (e.g., 2, 4, 6, 8, 10, 12, 14, 16 or 18).

[0022] Preferably, the aliphatic silane compound comprises hexamethyldisiloxane and / or hexaethyldisiloxane.

[0023] Preferably, the aliphatic germane compound has a structure as shown in Formula 3 and / or Formula 4 below.

[0024]

[0025] In formula 3 and formula 4, R 1 , R 2 , R 3 , R 4 , R 5 and R 6 Each is independently an alkyl group having 1 to 20 carbon atoms (e.g., 2, 4, 6, 8, 10, 12, 14, 16 or 18).

[0026] Preferably, the aliphatic germane compound includes any one of hexamethyldigermanium, hexaethyldigermanium, tetraethylgermanium or tetra-n-butylgermanium, or a combination of at least two thereof.

[0027] Preferably, the refractive index of the aromatic compound is ≥1.5100n D 20 , for example 1.5300n D 20 , 1.5500n D 20 , 1.5700n D 20 , 1.5900n D 20 , 1.6100n D 20 , 1.6300n D 20 、1.6500nD 20 , 1.6700n D 20 or 1.6900n D 20 wait.

[0028] Preferably, the density of the aromatic compound is 0.900-1.300 g / cm 3 ; For example, 0.950 g / cm 3 , 1.000g / cm 3 , 1.050g / cm 3 , 1.100g / cm 3 , 1.150g / cm 3 , 1.200g / cm 3 or 1.250g / cm 3 wait.

[0029] Preferably, the number average molecular weight of the aromatic compound is ≤800, for example, 100, 200, 300, 400, 500, 600 or 700, etc.

[0030] Preferably, the boiling point of the aromatic compound is ≥150°C, for example, 152°C, 154°C, 156°C, 158°C, 160°C, 162°C, 164°C, 166°C, 168°C or 170°C, etc.

[0031] Preferably, the refractive index of the insulating liquid is ≥1.4900n D 20 , for example 1.5000n D 20 , 1.5100n D 20 , 1.5200n D 20 , 1.5300n D 20 , 1.5400n D 20 , 1.5500n D 20 or 1.5600n D 20 wait.

[0032] In a second aspect, the present invention provides a high-reliability liquid lens, wherein the high-reliability liquid lens comprises a conductive liquid and the insulating liquid as described in the first aspect.

[0033] Preferably, the density difference between the conductive liquid and the insulating liquid as described in the first aspect is less than 0.01 g / cm 3 , for example 0.001 g / cm3 , 0.002g / cm 3 , 0.003g / cm 3 、0.004g / cm 3 , 0.005g / cm 3 , 0.006g / cm 3 , 0.007g / cm 3 , 0.008g / cm 3 or 0.009g / cm 3 wait.

[0034] Preferably, the conductive liquid comprises a solvent and an additive.

[0035] Preferably, the freezing point of the conductive liquid is ≤ -30°C, such as -35°C, -40°C, -45°C, -50°C, -55°C or -60°C.

[0036] Preferably, the boiling point of the conductive liquid is ≥120°C, for example, 125°C, 130°C, 135°C, 140°C, 145°C, 150°C, 155°C, 160°C or 165°C.

[0037] Preferably, the solvent includes any one of water, ethylene glycol or propylene glycol, or a combination of at least two of them.

[0038] Preferably, the additive comprises an inorganic salt and / or an organic salt.

[0039] Preferably, the volume percentage of the additive in the conductive liquid is 0.1% to 5%, for example, 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4% or 4.5%.

[0040] Preferably, the inorganic salt comprises sodium chloride and / or sodium bromide.

[0041] Preferably, the organic salt comprises potassium acetate and / or cesium acetate.

[0042] Preferably, the high-reliability liquid lens comprises an upper transparent substrate, a lower transparent substrate, a fluid chamber, an upper electrode and a lower electrode, the upper transparent substrate is fixed on the upper electrode, the lower transparent substrate is fixed on the lower electrode, the fluid chamber is arranged between the upper transparent substrate and the lower transparent substrate, the fluid chamber is filled with a conductive liquid and an insulating liquid as described in the first aspect, the conductive liquid is close to the upper transparent substrate, the insulating liquid is close to the lower transparent substrate, a liquid-liquid interface is formed between the two-phase liquids of the conductive liquid and the insulating liquid, an insulating layer or a hydrophobic layer is arranged between the lower electrode and the lower transparent substrate, and a three-phase interface is formed at the junction of the lower electrode and the two-phase liquid.

[0043] It should be noted that in the present invention, the upper transparent substrate is fixed on the upper electrode, and the lower transparent substrate is fixed on the lower electrode in no particular manner. For example, they can be fixed using adhesive materials well known to those skilled in the art.

[0044] Preferably, the insulating layer or the hydrophobic layer comprises any one of p-xylene linear polymer, siloxane or amorphous fluorine-containing polymer or a combination of at least two thereof.

[0045] Preferably, the para-xylene linear polymer includes any one of poly-p-xylene C, poly-p-xylene D, poly-p-xylene N, poly-p-xylene AF-4, poly-p-xylene HT or poly-p-xylene VT-4, or a combination of at least two thereof.

[0046] Preferably, the amorphous fluorine-containing polymer comprises perfluorinated amorphous fluororesin Teflon AF 1600 and / or perfluorinated amorphous fluororesin Cytop.

[0047] In a third aspect, the present invention provides an application of the high-reliability liquid lens as described in the second aspect in a camera, a mobile phone, an endoscope, a barcode scanner, a telemeter or a dental camera.

[0048] Compared with the prior art, the present invention has the following beneficial effects:

[0049] In the present invention, an aromatic compound having a structure as shown in Formula I and / or Formula II is added to the insulating liquid, and the aromatic compound has the characteristics of high refractive index and good photochemical stability. The high-reliability liquid lens containing the insulating liquid can withstand long-term (≥90 days), high temperature (≥90°C), high-intensity exposure (765W / m 2 ) environment, the performance such as zoom range, hysteresis and response time remain relatively stable, with good reliability, which can broaden the application field of liquid lens technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 A schematic diagram of the structure of a high-reliability liquid lens provided in Example 1;

[0051] Among them, 11-upper transparent substrate; 12-lower transparent substrate; 30-upper electrode; 52-lower electrode; 51-insulating layer; 10-upper transparent substrate adhesive material; 64-lower transparent substrate adhesive material; 41-conductive liquid; 42-insulating liquid;

[0052] Figure 2 The change of the refractive power of the high-reliability liquid lens prepared in Example 1 after light aging relative to the applied voltage;

[0053] Figure 3The change of the refractive power of the high-reliability liquid lens prepared in Example 2 after light aging relative to the applied voltage;

[0054] Figure 4 The change of the refractive power of the high-reliability liquid lens obtained in Example 3 after light aging relative to the applied voltage;

[0055] Figure 5 The change of the refractive power of the high-reliability liquid lens prepared in Example 4 after light aging relative to the applied voltage;

[0056] Figure 6 The change of the refractive power of the high-reliability liquid lens obtained in Example 5 after light aging relative to the applied voltage;

[0057] Figure 7 The change of the refractive power of the liquid lens prepared in Comparative Example 1 after light aging relative to the applied voltage;

[0058] Figure 8 The figure shows the change in the refractive power of the liquid lens prepared in Comparative Example 1 after light aging relative to the applied voltage. DETAILED DESCRIPTION

[0059] The technical solution of the present invention is further described below by specific implementation methods. It should be understood by those skilled in the art that the embodiments are only to help understand the present invention and should not be regarded as specific limitations of the present invention.

[0060] The physical property parameters of some components in the following examples and comparative examples are shown in Table 1.

[0061] Table 1

[0062]

[0063] Example 1

[0064] This embodiment provides an insulating liquid and a high-reliability liquid lens. The components, contents, physical properties, and refractive index difference between the insulating liquid and the conductive liquid (refractive index difference Δn=|refractive index of insulating liquid-refractive index of conductive liquid|) are shown in Table 2 below.

[0065] Table 2

[0066]

[0067] The high reliability liquid lens, such as Figure 1As shown, it includes an upper transparent substrate 11, a lower transparent substrate 12, a fluid chamber, an upper electrode 30 and a lower electrode 52, wherein the upper transparent substrate 11 is fixed on the upper electrode 30 by an upper transparent substrate adhesive material 10, and the lower transparent substrate 12 is fixed on the lower electrode 52 by a lower transparent substrate adhesive material 64, and the fluid chamber is arranged between the upper transparent substrate 11 and the lower transparent substrate 12, and the insulating liquid 42 and the conductive liquid 41 are filled in the fluid chamber, the conductive liquid 41 is close to the upper transparent substrate 11, and the insulating liquid 42 is close to the lower transparent substrate 12, and a liquid-liquid interface is formed between the two-phase liquids of the conductive liquid 41 and the insulating liquid 42 ( Figure 1 A or B in the middle, the shapes of the conductive liquid and the insulating liquid change by applying voltage, and the liquid-liquid interface can change between A and B, thereby realizing variable focal length), an insulating layer 51 is arranged between the lower electrode 52 and the lower transparent substrate 12 (the insulating layer is made of fully fluorinated amorphous fluororesin Teflon AF 1600, and a three-phase interface is formed at the junction of the lower electrode 52 and the two-phase liquid.

[0068] Example 2

[0069] This embodiment provides an insulating liquid and a high-reliability liquid lens, which differs from Embodiment 1 in that the components, contents, physical properties, and refractive index difference between the insulating liquid and the conductive liquid (refractive index difference Δn=|refractive index of insulating liquid-refractive index of conductive liquid|) are as shown in Table 3 below.

[0070] Table 3

[0071]

[0072] In Table 3, “ / ” represents no added compound.

[0073] Other conditions are the same as in Example 1.

[0074] Example 3

[0075] This embodiment provides an insulating liquid and a high-reliability liquid lens, which differs from Embodiment 1 in that the components, contents, physical properties, and refractive index difference between the insulating liquid and the conductive liquid (refractive index difference Δn=|refractive index of insulating liquid-refractive index of conductive liquid|) are as shown in Table 4 below.

[0076] Table 4

[0077]

[0078] In Table 4, “ / ” represents no added compound.

[0079] Other conditions are the same as in Example 1.

[0080] Example 4

[0081] This embodiment provides an insulating liquid and a high-reliability liquid lens, which differs from Embodiment 1 in that the components, contents, physical properties, and refractive index difference between the insulating liquid and the conductive liquid (refractive index difference Δn=|refractive index of insulating liquid-refractive index of conductive liquid|) are as shown in Table 5 below.

[0082] Table 5

[0083]

[0084]

[0085] In Table 5, “ / ” represents no added compound.

[0086] Other conditions are the same as in Example 1.

[0087] Example 5

[0088] This embodiment provides an insulating liquid and a high-reliability liquid lens, which differs from Embodiment 1 in that the components, contents, physical properties, and refractive index difference between the insulating liquid and the conductive liquid (refractive index difference Δn=|refractive index of insulating liquid-refractive index of conductive liquid|) are as shown in Table 6 below.

[0089] Table 6

[0090]

[0091]

[0092] In Table 6, “ / ” represents no added compound.

[0093] Other conditions are the same as in Example 1.

[0094] Comparative Example 1

[0095] This comparative example provides an insulating liquid and a liquid lens, which differ from Example 1 only in that 2-ethylnaphthalene in the insulating liquid is replaced with 1-fluoronaphthalene, and the components, contents, physical properties, and refractive index difference between the insulating liquid and the conductive liquid (refractive index difference Δn=|refractive index of insulating liquid-refractive index of conductive liquid|) are shown in Table 7 below.

[0096] Table 7

[0097]

[0098] Other conditions are the same as in Example 1.

[0099] Comparative Example 2

[0100] This comparative example provides an insulating liquid and a liquid lens, which differ from Example 1 only in that 2-ethylnaphthalene in the insulating liquid is replaced with 1-chloronaphthalene, and the components, contents, physical properties, and refractive index difference between the insulating liquid and the conductive liquid (refractive index difference Δn=|refractive index of insulating liquid-refractive index of conductive liquid|) are shown in Table 8 below.

[0101] Table 8

[0102]

[0103] Other conditions are the same as in Example 1.

[0104] The hysteresis and response time of the high reliability liquid lens provided in the above embodiments 1 to 5 and the liquid lens provided in the comparative examples 1 to 2 were tested at the initial stage and after light aging. The experimental conditions of light aging were: temperature of 90°C, light intensity of 765W / m 2 , the wavelength of light is 10-400nm, and the time is 90 days.

[0105] The results of the hysteresis and response time tests are shown in Table 9 below.

[0106] Table 9

[0107]

[0108]

[0109] It can be seen from the contents of Table 9 that the high-reliability liquid lenses provided in Examples 1 to 5 have small differences in initial hysteresis and response time and after light aging, remain relatively stable, and have good light stability.

[0110] Compared with Example 1, if 2-ethylnaphthalene in the insulating liquid is replaced with 1-fluoronaphthalene, and the content of each component in the insulating liquid is adjusted (Comparative Example 1), so that the density of the insulating liquid and the conductive liquid remains similar, the hysteresis of the prepared liquid lens after light aging increases and the response time is significantly prolonged.

[0111] Compared with Example 1, if 2-ethylnaphthalene in the insulating liquid is replaced with 1-chloronaphthalene, and the content of each component in the insulating liquid is adjusted (Comparative Example 2) so that the density of the insulating liquid and the conductive liquid remains similar, the hysteresis of the prepared liquid lens increases and the response time is significantly prolonged after light aging.

[0112] The changes in the refractive power of the high reliability liquid lenses provided in Examples 1 to 5 and the liquid lenses provided in Comparative Examples 1 to 2 after light aging relative to the applied voltage were tested. Figures 2 to 8 shown.

[0113] Figures 2 to 6The figures show the change of the refractive power of the high-reliability liquid lenses obtained in Examples 1 to 5 after light aging relative to the applied voltage. After light aging, the liquid lenses are tested by applying voltage or reducing voltage. The liquid lenses can zoom normally, and the rising and falling curves of the refractive power completely overlap, the hysteresis and response time hardly change, and the performance is good.

[0114] Figures 7-8 The figures are respectively the changes of the refractive power of the liquid lenses prepared in comparative examples 1 to 2 after light aging relative to the applied voltage. After light aging, the liquid lenses are tested by applying voltage or reducing voltage. The liquid lenses have abnormal zooming, and the curves of the rising and falling sections of the refractive power cannot completely overlap, indicating poor performance.

[0115] In summary, the high-reliability liquid lens comprising the insulating liquid provided by the present invention can achieve relatively stable performance such as zoom range, hysteresis and response time under long-term high-intensity exposure environment.

[0116] The applicant declares that the present invention illustrates the process method of the present invention through the above-mentioned embodiments, but the present invention is not limited to the above-mentioned process steps, that is, it does not mean that the present invention must rely on the above-mentioned process steps to be implemented. Those skilled in the art should understand that any improvement of the present invention, equivalent replacement of the raw materials selected by the present invention, addition of auxiliary components, selection of specific methods, etc., all fall within the protection scope and disclosure scope of the present invention.

Claims

1. An insulating liquid, characterized in that: The insulating liquid includes an aromatic compound, and the aromatic compound has any one or a combination of at least two of the following structures: Wherein, R1, R2, R3, R4 and R5 are each independently an alkyl group having 1 to 20 carbon atoms or an aryl group having 6 to 10 carbon atoms, and X is silicon or germanium.

2. The insulating liquid according to claim 1, characterized in that The R1, R2, R3, R4 and R5 are each independently any one of methyl, ethyl, isopropyl, n-propyl, isopropyl, n-butyl, isobutyl or phenyl.

3. The insulating liquid according to claim 1 or 2, characterized in that: The aromatic compound includes any one of 1-ethylnaphthalene, 2-ethylnaphthalene, 1-isopropylnaphthalene, 2-isopropylnaphthalene, 1-n-butylnaphthalene, 2-n-butylnaphthalene, 1-phenylnaphthalene, 1-naphthyl-1,1,3,3,3-pentamethyldisiloxane, 1-naphthyl-1,1-diethyl-3,3,3-trimethyldisiloxane, 1-naphthyl-1,1,3,3,3-pentamethyldigermane, 1-naphthyl-1,1-diethyl-3,3,3-trimethyldigermane, 1,1,3,3-tetramethyl-1,3-diphenyldisiloxane, 1,3-diethyl-1,3-dimethyl-1,3-diphenyldisiloxane or 1,3-dimethyl-1,1,3,3-tetraphenyldisiloxane or a combination of at least two thereof.

4. The insulating liquid according to any one of claims 1 to 3, characterized in that: The insulating liquid also includes an aliphatic compound; Preferably, the aliphatic compound includes any one of an alkane compound, a halogenated hydrocarbon compound, an aliphatic silane compound or an aliphatic germane compound, or a combination of at least two thereof.

5. The insulating liquid according to claim 4, characterized in that: The alkane compound includes an alkane compound having 1 to 20 carbon atoms; Preferably, the alkane compound comprises isododecane and / or n-hexadecane; Preferably, the halogenated hydrocarbon compound comprises a halogenated hydrocarbon compound having 1 to 20 carbon atoms; Preferably, the halogenated hydrocarbon compound comprises perfluorooctane.

6. The insulating liquid according to claim 4 or 5, characterized in that: The aliphatic silane compound has a structure as shown in Formula 1 and / or Formula 2 below; In formula 1 and formula 2, R 1 , R 2 , R 3 , R 4 , R 5 and R 6 Each is independently an alkyl group having 1 to 20 carbon atoms; Preferably, the aliphatic silane compound comprises hexamethyldisiloxane and / or hexaethyldisiloxane; Preferably, the aliphatic germane compound has a structure as shown in Formula 3 and / or Formula 4 below: In formula 3 and formula 4, R 1 , R 2 , R 3 , R 4 , R 5 and R 6 Each is independently an alkyl group having 1 to 20 carbon atoms; Preferably, the aliphatic germane compound includes any one of hexamethyldigermanium, hexaethyldigermanium, tetraethylgermanium or tetra-n-butylgermanium, or a combination of at least two thereof.

7. The insulating liquid according to any one of claims 1 to 6, characterized in that: The refractive index of the aromatic compound is ≥1.5100n D 20 ; Preferably, the density of the aromatic compound is 0.900-1.300 g / cm 3 ; Preferably, the number average molecular weight of the aromatic compound is ≤800; Preferably, the boiling point of the aromatic compound is ≥150°C Preferably, the refractive index of the insulating liquid is ≥1.4900n D 20 .

8. A high reliability liquid lens, characterized in that: The high-reliability liquid lens comprises a conductive liquid and an insulating liquid as described in any one of claims 1-7.

9. The high reliability liquid lens according to claim 8, characterized in that: The density difference between the conductive liquid and the insulating liquid according to any one of claims 1 to 7 is less than 0.01 g / cm 3 ; Preferably, the conductive liquid comprises a solvent and an additive; Preferably, the freezing point of the conductive liquid is ≤-30°C; Preferably, the boiling point of the conductive liquid is ≥120°C; Preferably, the solvent comprises any one of water, ethylene glycol or propylene glycol, or a combination of at least two thereof; Preferably, the additive comprises an inorganic salt and / or an organic salt; Preferably, the volume percentage of the additive in the conductive liquid is 0.1% to 5%; Preferably, the inorganic salt comprises sodium chloride and / or sodium bromide; Preferably, the organic salt comprises potassium acetate and / or cesium acetate; Preferably, the high-reliability liquid lens comprises an upper transparent substrate, a lower transparent substrate, a fluid chamber, an upper electrode and a lower electrode, the upper transparent substrate is fixed on the upper electrode, the lower transparent substrate is fixed on the lower electrode, the fluid chamber is arranged between the upper transparent substrate and the lower transparent substrate, the fluid chamber is filled with a conductive liquid and an insulating liquid as claimed in any one of claims 1 to 7, the conductive liquid is close to the upper transparent substrate, the insulating liquid is close to the lower transparent substrate, a liquid-liquid interface is formed between the two-phase liquids of the conductive liquid and the insulating liquid, an insulating layer or a hydrophobic layer is arranged between the lower electrode and the lower transparent substrate, and a three-phase interface is formed at the junction of the lower electrode and the two-phase liquid; Preferably, the insulating layer or the hydrophobic layer comprises any one of p-xylene linear polymer, siloxane or amorphous fluorine-containing polymer or a combination of at least two thereof.

10. Use of the high-reliability liquid lens as claimed in claim 8 or 9 in a camera, a mobile phone, an endoscope, a barcode scanner, a telemeter or a dental camera.

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