Insulating liquid, high refractive index liquid lens and application thereof

Abstract

The present invention provides an insulating liquid, a high refractive index liquid lens and applications thereof, wherein the insulating liquid comprises a first solution and a second solution, wherein the first solution comprises an aromatic compound, and the second solution comprises an aliphatic compound, wherein the aliphatic compound is an aliphatic silane compound and / or an aliphatic germane compound. The insulating liquid of the present invention has a high refractive index property, with a refractive index of ≥1.48, and has good chemical and temperature stability, especially being able to remain transparent after being subjected to high temperature for a certain period of time.

Description

Technical Field

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

[0002] The variable focus liquid lens based on the electrowetting phenomenon usually includes two liquids of equal density with different refractive indices and immiscible with each other, namely, conductive liquid and insulating liquid. The two phases of liquid are in contact and form a meniscus interface. The wettability of the liquid is controlled by applying voltage, thereby causing the meniscus to change, thereby achieving a variable focal length effect. Compared with traditional mechanical zoom, the liquid lens has greater advantages in low power consumption and fast continuous zoom.

[0003] The zoom range of the electrowetting liquid lens is based on the refractive index difference between the conductive liquid and the insulating liquid. The larger the refractive index difference, the larger the zoom range. Water has a relatively low refractive index and is often used as the main component of the conductive liquid. However, water has disadvantages that cannot be ignored. For example, water molecules are small in size, and when the temperature is higher than 50°C, water molecules have the possibility of evaporation, and they can easily penetrate insulating or hydrophobic membranes, causing excessive leakage current, causing reliability problems such as unstable performance of the liquid lens, and even causing the liquid lens to fail.

[0004] Therefore, in order to provide a liquid lens with a wide zoom range, an insulating liquid with a high refractive index is necessary, and the stability and reliability of the liquid lens must be ensured. Summary of the invention

[0005] In view of the deficiencies in the prior art, the object of the present invention is to provide an insulating liquid, a high refractive index liquid lens and applications thereof, wherein the insulating liquid has a high refractive index property, a refractive index ≥ 1.48, and has good chemical and temperature stability, especially remaining transparent after being subjected to high temperature for a certain period of time, thereby expanding the zoom range of the liquid lens and providing a liquid lens with high optical power and high stability.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] In a first aspect, the present invention provides an insulating liquid, the insulating liquid comprising a first solution and a second solution, the first solution comprising an aromatic compound, the second solution comprising an aliphatic compound, and the aliphatic compound is an aliphatic silane compound and / or an aliphatic germane compound.

[0008] The insulating liquid provided by the present invention comprises a high refractive index solution (first solution) with a specific structure and a transmittance restoring agent (second solution) with a specific structure, and has good chemical and temperature stability.

[0009] As a preferred technical solution of the present invention, the aromatic compound has a structure shown in the following formula:

[0010] Any one or a combination of at least two of the following.

[0011] Wherein, R1, R2 and R3 are the same or different and are independently selected from aliphatic alkyl or aromatic groups;

[0012] R′ is selected from aliphatic alkyl, aromatic group, fluorine, chlorine or bromine;

[0013] X is silicon or germanium.

[0014] As a preferred technical solution of the present invention, the aromatic compound is selected from any one or a combination of at least two of chlorobenzene, ethylbenzene, cyclohexylbenzene, phenyltrimethylgermane, dimethyldiphenylsilane, 2-ethylnaphthalene or 1-fluoronaphthalene.

[0015] As a preferred technical solution of the present invention, the aliphatic compound has a structure shown in the following formula:

[0016] Any one or a combination of at least two of the following.

[0017] Wherein, R1, R2, R3, R4 and R′ are the same or different, and are independently selected from alkyl groups, and R′ in the same chemical formula is the same or different;

[0018] n represents an integer from 0 to 10, and n=0, 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10.

[0019] As a preferred technical solution of the present invention, the aliphatic compound is selected from any one of hexaethyldisiloxane, hexamethyldisilane, hexamethyldigermanium, tetraethoxygermanium or triethylfluorosilane, or a combination of at least two thereof.

[0020] As a preferred technical solution of the present invention, the density of the first solution is 0.800-1.200 g / cm 3 , for example, it can be 0.800 g / cm 3 , 0.850g / cm 3 , 0.900g / cm 3 、0.950g / cm 3 , 1.000g / cm 3 , 1.150g / cm 3 or 1.200g / cm 3 , but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0021] Preferably, the refractive index of the first solution is ≥1.48n D 20 .

[0022] Preferably, the viscosity of the first solution is 0 to 25 mPa·s, for example, it can be 0 mPa·s, 1 mPa·s, 5 mPa·s, 8 mPa·s, 10 mPa·s, 12 mPa·s, 15 mPa·s, 18 mPa·s, 20 mPa·s, 23 mPa·s or 25 mPa·s, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0023] As a preferred technical solution of the present invention, the density of the second solution is 0.700-1.200 g / cm 3 , for example, it can be 0.700 g / cm 3 , 0.750g / cm 3 , 0.800g / cm 3 , 0.850g / cm 3 , 0.900g / cm 3 、0.950g / cm 3 , 1.000g / cm 3 , 1.150g / cm 3 or 1.200g / cm 3 , but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0024] Preferably, the refractive index of the second solution is 1.30-1.48n D 20 , for example, it can be 1.30n D 20 , 1.32n D 20 , 1.33n D 20 , 1.35n D 20 , 1.38n D 20 , 1.40n D 20 , 1.42n D 20 , 1.45n D 20 or 1.48n D 20 , but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0025] Preferably, the viscosity of the second solution is 0 to 25 mPa·s, for example, it can be 0 mPa·s, 1 mPa·s, 5 mPa·s, 8 mPa·s, 10 mPa·s, 12 mPa·s, 15 mPa·s, 18 mPa·s, 20 mPa·s, 23 mPa·s or 25 mPa·s, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0026] In a second aspect, the present invention provides a high refractive index liquid lens, wherein the high refractive index liquid lens comprises a conductive liquid and the insulating liquid described in the first aspect.

[0027] The high refractive index liquid lens provided by the present invention comprises a conductive liquid and an insulating liquid with different refractive indices, and the two liquids are immiscible with each other, and a liquid-liquid two-phase interface is formed between the two liquids. The insulating liquid comprises a high refractive index solution with a specific structure (a first solution containing an aromatic ring structure) and a transmittance restorer (a second solution containing an aliphatic silane compound and / or an aliphatic germane compound), both of which are insoluble or slightly soluble in the conductive liquid, thereby expanding the zoom range of the high refractive index liquid lens, making it have the characteristics of high optical power and high stability, and after a high temperature lasts for a certain period of time, the conductive liquid and the insulating liquid can still remain transparent.

[0028] As a preferred technical solution of the present invention, the density difference between the conductive liquid and the insulating liquid is less than 0.01 g / cm 3 .

[0029] Preferably, the conductive liquid includes any one of water, ethylene glycol or propylene glycol, or a combination of at least two of them.

[0030] Preferably, the conductive liquid further comprises an additive, and the additive is an inorganic salt and / or an organic salt.

[0031] Preferably, the content of the additive is 0.1-6wt.%, for example, it can be 0.1wt.%, 0.2wt.%, 0.5wt.%, 1.0wt.%, 2.0wt.%, 3.0wt.%, 4.0wt.%, 4.5wt.%, 5.0wt.%, 5.5wt.% or 6.0wt.%, but it is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0032] Preferably, the inorganic salt comprises sodium chloride and / or sodium bromide.

[0033] Preferably, the organic salt comprises potassium acetate and / or cesium acetate.

[0034] Water has a relatively low refractive index and is often used as the main component of conductive liquids. However, water molecules are small in size and easily evaporate at high temperatures. They also have the risk of penetrating through insulating or hydrophobic membranes, causing excessive leakage current, leading to unstable performance of the liquid lens, and even causing the liquid lens to fail. Therefore, in order to provide a liquid lens with a wide zoom range, it is necessary to add an insulating liquid with a high refractive index, which can also ensure the stability and reliability of the liquid lens.

[0035] In a third aspect, the present invention provides an application of the high refractive index liquid lens described in the second aspect, wherein the high refractive index liquid lens is applied to cameras, mobile phones, endoscopes, telemeters and dental cameras.

[0036] The numerical range described in the present invention not only includes the point values ​​listed above, but also includes any point values ​​between the above numerical ranges that are not listed. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values ​​included in the range.

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] (1) The present invention provides an insulating liquid, a high refractive index liquid lens and applications thereof, wherein the insulating liquid comprises a high refractive index liquid and a transmittance restoring agent and has good stability;

[0039] (2) The high refractive index liquid lens provided by the present invention uses a high refractive index liquid containing an aromatic ring and a transmittance restoration agent containing aliphatic germane or aliphatic silane as the insulating liquid, has a high refractive index and a high optical focal length, and after being kept at ≤70°C for a period of 0 to 1000 hours, the insulating liquid and the conductive liquid still maintain high transparency, and the transmittance thereof is ≥95%, which is beneficial to improving the technical advancement of the liquid lens and ensuring the stability of the liquid lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 A schematic structural diagram of a high refractive index liquid lens provided in a specific embodiment of the present invention.

[0041] Among them, 1-upper transparent substrate; 2-lower transparent substrate; 3-upper electrode; 4-lower electrode; 5-fluid chamber. DETAILED DESCRIPTION

[0042] It should be understood that, in the description of the present invention, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0043] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0044] In a specific embodiment, the present invention provides an insulating liquid, which includes a first solution and a second solution, wherein the first solution includes an aromatic compound, and the second solution includes an aliphatic compound, and the aliphatic compound is an aliphatic silane compound and / or an aliphatic germane compound.

[0045] The first solution containing aromatic rings in the present invention has the characteristic of high refractive index and serves as a high refractive index component of the insulating liquid. The second solution containing aliphatic silane or aliphatic germane serves as a transmittance restoring agent, thereby improving the stability of the insulating liquid.

[0046] In some embodiments, the aromatic compound has a structure as shown in the following formula:

[0047] Any one or a combination of at least two of the following.

[0048] Wherein, R1, R2 and R3 are the same or different and are independently selected from aliphatic alkyl or aromatic groups;

[0049] R′ is selected from aliphatic alkyl, aromatic group, fluorine, chlorine or bromine;

[0050] X is silicon or germanium.

[0051] In some embodiments, the aromatic compound is selected from any one or a combination of at least two of chlorobenzene, ethylbenzene, cyclohexylbenzene, phenyltrimethylgermane, dimethyldiphenylsilane, 2-ethylnaphthalene or 1-fluoronaphthalene.

[0052] In some embodiments, the aliphatic compound has a structure as shown in the following formula:

[0053] Any one or a combination of at least two of the following.

[0054] Wherein, R1, R2, R3, R4 and R′ are the same or different, and are independently selected from alkyl groups, and R′ in the same chemical formula is the same or different;

[0055] n represents an integer from 0 to 10.

[0056] In some embodiments, the aliphatic compound is selected from any one or a combination of at least two of hexaethyldisiloxane, hexamethyldisilane, hexamethyldigermanium, tetraethoxygermanium or triethylfluorosilane.

[0057] In some embodiments, the density of the first solution is 0.800-1.200 g / cm 3 , the refractive index of the first solution is ≥1.48n D 20 , the viscosity of the first solution is 0 to 25 mPa·s.

[0058] In some embodiments, the density of the second solution is 0.700-1.200 g / cm 3 , the refractive index of the second solution is 1.30 to 1.48n D 20 , the viscosity of the second solution is 0 to 25 mPa·s.

[0059] Table 1 shows the physical properties of different aromatic compounds:

[0060] Table 1

[0061] Compound <![CDATA[Density (g·cm -3 )]]> Viscosity (mPa·s) <![CDATA[Refractive index (n D 20 )]]> chlorobenzene 1.1100 0.7990 1.5270 Ethylbenzene 0.8700 0.6350 1.4970 Cyclohexylbenzene 0.9500 3.6810 1.5230 Phenyltrimethylgermane 1.1170 15.8600 1.5045 Dimethyldiphenylsilane 0.9850 12.7800 1.5618 2-Ethylnaphthalene 0.9920 2.7850 1.6000 1-Fluoronaphthalene 1.1287 2.5640 1.5939

[0062] Table 2 shows the physical properties of different aliphatic compounds:

[0063] Table 2

[0064] Compound <![CDATA[Density (g·cm -3 )]]> Viscosity (mPa·s) <![CDATA[Refractive index (n D 20 )]]> Hexaethyldisiloxane 0.8440 6.6800 1.4330 Hexamethyldisilane 0.7150 6.1100 1.4220 Hexamethyldigermanium 1.1750 8.8300 1.4560 Tetraethoxygermanium 1.1340 7.8200 1.4049 Triethylfluorosilane 0.7950 4.7400 1.3760

[0065] Table 3 shows the solubility parameters of different aromatic and aliphatic compounds in polar liquids:

[0066] Table 3

[0067]

[0068] In Table 3, nd means not detected.

[0069] The present invention adopts a high-refractive index liquid and a transmittance restoring agent with a specific structure to ensure a relatively high refractive index, which is beneficial to improving the stability of the insulating liquid. After being kept at ≤70°C for a certain period of time, the liquid can still maintain high transparency.

[0070] In another specific embodiment, the present invention provides a high refractive index liquid lens, wherein the high refractive index liquid lens comprises a conductive liquid and an insulating liquid as described in a specific embodiment. The density difference between the conductive liquid and the insulating liquid is less than 0.01 g / cm 3 .

[0071] In some embodiments, the conductive liquid includes any one of water, ethylene glycol or propylene glycol or a combination of at least two thereof. The conductive liquid also includes an additive, the content (mass percentage) of which is 0.1 to 6 wt.%. The additive is an inorganic salt and / or an organic salt, the inorganic salt includes sodium chloride and / or sodium bromide, and the organic salt includes potassium acetate and / or cesium acetate.

[0072] The principle of the high refractive index liquid lens in the present invention is: by filling the space between two insulating transparent substrates with conductive liquid and insulating liquid, a meniscus-shaped liquid-liquid two-phase interface is formed between the conductive liquid and the insulating liquid, the two transparent substrates are respectively fixed on corresponding electrodes, and the wettability of the liquid is controlled by applying voltage to cause changes in the liquid-liquid two-phase interface, thereby achieving a variable focal length effect.

[0073] The high refractive index liquid lens includes two transparent substrates, two electrodes, and a fluid chamber 5 disposed between the two transparent substrates, which are well known to those skilled in the art. The fluid chamber 5 is filled with a conductive liquid and an insulating liquid, and the two transparent substrates are fixed to the two electrodes respectively by adhesive materials. The surface of the fluid chamber 5 is treated to be hydrophobic, i.e., coated with an insulating film layer or a hydrophobic film layer, and the aqueous solution will gather in the center of the fluid chamber 5 in a dome shape, and a liquid-liquid interface with a concave curved surface is formed between the two phases of liquid (conductive liquid and insulating liquid). Figure 1 As shown, two transparent substrates are arranged opposite to each other up and down, and are respectively marked as an upper transparent substrate 1 and a lower transparent substrate 2, and two electrodes are respectively marked as an upper electrode 3 and a lower electrode 4, the upper electrode 3 is fixedly connected to the upper transparent substrate 1, and the lower electrode 4 is fixedly connected to the lower transparent substrate 2, and the fluid chamber 5 is formed between the upper transparent substrate 1 and the lower transparent substrate 2. The conductive liquid is close to the upper transparent substrate 1, and the insulating liquid is close to the lower transparent substrate 2.

[0074] Water as a conductive liquid has a low refractive index. The higher the water content, the lower the refractive index of the conductive liquid. In addition, water molecules evaporate easily at high temperatures and easily penetrate through the film layer, causing excessive leakage current and leading to failure of the liquid lens. The present invention adds an insulating liquid with a specific structure to the liquid lens, which is incompatible with the conductive liquid and has a small density difference, thereby expanding the zoom range of the liquid lens. After being kept at ≤70°C for a certain period of time, the insulating liquid and the conductive liquid always maintain high transparency, and their transmittance is ≥95%. The liquid lens provided by the present invention has a wide range of applications and is suitable for cameras, mobile phones, endoscopes, telemeters or dental cameras.

[0075] Example 1

[0076] This embodiment provides a high refractive index liquid lens, including two transparent substrates, two electrodes, the two transparent substrates are fixed on the two electrodes by adhesive materials, a fluid chamber 5 is arranged between the two transparent substrates, and the fluid chamber 5 is filled with conductive liquid and insulating liquid. The two transparent substrates are arranged opposite to each other up and down, respectively denoted as an upper transparent substrate 1 and a lower transparent substrate 2, and the two electrodes are respectively denoted as an upper electrode 3 and a lower electrode 4, the upper electrode 3 is fixedly connected to the upper transparent substrate 1, and the lower electrode 4 is fixedly connected to the lower transparent substrate 2, and a fluid chamber 5 is formed between the upper transparent substrate 1 and the lower transparent substrate 2. The conductive liquid is close to the upper transparent substrate 1, and the insulating liquid is close to the lower transparent substrate 2.

[0077] The specific material selection, mixing ratio and physical properties of the insulating liquid and the conductive liquid are shown in Table 4, and the refractive index difference between the insulating liquid and the conductive liquid (refractive index difference Δn=|insulating liquid refractive index-conductive liquid refractive index|) is calculated, as shown in Table 4 below:

[0078] Table 4

[0079]

[0080] The high refractive index liquid lens provided in this embodiment uses a conductive liquid and an insulating liquid with different refractive indices, and the density difference between the two is less than <0.01g / cm 3 , the insulating liquid includes chlorobenzene with a high refractive index, and hexaethyldisiloxane as a transmittance restoring agent, which is beneficial to expand the zoom range of the liquid lens and has higher stability.

[0081] Example 2

[0082] This embodiment provides a high refractive index liquid lens, including two transparent substrates, two electrodes, the two transparent substrates are fixed on the two electrodes by adhesive materials, a fluid chamber 5 is arranged between the two transparent substrates, and the fluid chamber 5 is filled with conductive liquid and insulating liquid. The two transparent substrates are arranged opposite to each other up and down, respectively denoted as an upper transparent substrate 1 and a lower transparent substrate 2, and the two electrodes are respectively denoted as an upper electrode 3 and a lower electrode 4, the upper electrode 3 is fixedly connected to the upper transparent substrate 1, and the lower electrode 4 is fixedly connected to the lower transparent substrate 2, and a fluid chamber 5 is formed between the upper transparent substrate 1 and the lower transparent substrate 2. The conductive liquid is close to the upper transparent substrate 1, and the insulating liquid is close to the lower transparent substrate 2.

[0083] The specific material selection, mixing ratio and physical properties of the insulating liquid and the conductive liquid are shown in Table 5, and the refractive index difference between the insulating liquid and the conductive liquid (refractive index difference Δn=|insulating liquid refractive index-conductive liquid refractive index|) is calculated, as shown in Table 5 below:

[0084] Table 5

[0085]

[0086] The high refractive index liquid lens provided in this embodiment uses a conductive liquid and an insulating liquid with different refractive indices, and the density difference between the two is less than <0.01g / cm 3 The insulating liquid includes cyclohexylbenzene and 1-fluoronaphthalene with high refractive index, and hexamethyldigermanium as a transmittance restoring agent, which is beneficial to expand the zoom range of the liquid lens and has higher stability.

[0087] Example 3

[0088] This embodiment provides a high refractive index liquid lens, including two transparent substrates, two electrodes, the two transparent substrates are fixed on the two electrodes by adhesive materials, a fluid chamber 5 is arranged between the two transparent substrates, and the fluid chamber 5 is filled with conductive liquid and insulating liquid. The two transparent substrates are arranged opposite to each other up and down, respectively denoted as an upper transparent substrate 1 and a lower transparent substrate 2, and the two electrodes are respectively denoted as an upper electrode 3 and a lower electrode 4, the upper electrode 3 is fixedly connected to the upper transparent substrate 1, and the lower electrode 4 is fixedly connected to the lower transparent substrate 2, and a fluid chamber 5 is formed between the upper transparent substrate 1 and the lower transparent substrate 2. The conductive liquid is close to the upper transparent substrate 1, and the insulating liquid is close to the lower transparent substrate 2.

[0089] The specific material selection, mixing ratio and physical properties of the insulating liquid and the conductive liquid are shown in Table 6, and the refractive index difference between the insulating liquid and the conductive liquid (refractive index difference Δn=|insulating liquid refractive index-conductive liquid refractive index|) is calculated, as shown in Table 6 below:

[0090] Table 6

[0091]

[0092] The high refractive index liquid lens provided in this embodiment uses a conductive liquid and an insulating liquid with different refractive indices, and the density difference between the two is less than <0.01g / cm 3 , the insulating liquid includes phenyltrimethylgermane with a high refractive index, and tetraethoxygermanium as a transmittance restoring agent, which is beneficial to expand the zoom range of the liquid lens and has higher stability.

[0093] Example 4

[0094] This embodiment provides a high refractive index liquid lens, including two transparent substrates, two electrodes, the two transparent substrates are fixed on the two electrodes by adhesive materials, a fluid chamber 5 is arranged between the two transparent substrates, and the fluid chamber 5 is filled with conductive liquid and insulating liquid. The two transparent substrates are arranged opposite to each other up and down, respectively denoted as an upper transparent substrate 1 and a lower transparent substrate 2, and the two electrodes are respectively denoted as an upper electrode 3 and a lower electrode 4, the upper electrode 3 is fixedly connected to the upper transparent substrate 1, and the lower electrode 4 is fixedly connected to the lower transparent substrate 2, and a fluid chamber 5 is formed between the upper transparent substrate 1 and the lower transparent substrate 2. The conductive liquid is close to the upper transparent substrate 1, and the insulating liquid is close to the lower transparent substrate 2.

[0095] The specific material selection, mixing ratio and physical properties of the insulating liquid and the conductive liquid are shown in Table 7, and the refractive index difference between the insulating liquid and the conductive liquid (refractive index difference Δn=|insulating liquid refractive index-conductive liquid refractive index|) is calculated, as shown in Table 7 below:

[0096] Table 7

[0097]

[0098] The high refractive index liquid lens provided in this embodiment uses a conductive liquid and an insulating liquid with different refractive indices, and the density difference between the two is less than <0.01g / cm 3 , the insulating liquid includes dimethyldiphenylsilane and 1-fluoronaphthalene with high refractive index, and triethylfluorosilane as a transmittance restoring agent, which is beneficial to expand the zoom range of the liquid lens and has higher stability.

[0099] Example 5

[0100] This embodiment provides a high refractive index liquid lens, including two transparent substrates, two electrodes, the two transparent substrates are fixed on the two electrodes by adhesive materials, a fluid chamber 5 is arranged between the two transparent substrates, and the fluid chamber 5 is filled with conductive liquid and insulating liquid. The two transparent substrates are arranged opposite to each other up and down, respectively denoted as an upper transparent substrate 1 and a lower transparent substrate 2, and the two electrodes are respectively denoted as an upper electrode 3 and a lower electrode 4, the upper electrode 3 is fixedly connected to the upper transparent substrate 1, and the lower electrode 4 is fixedly connected to the lower transparent substrate 2, and a fluid chamber 5 is formed between the upper transparent substrate 1 and the lower transparent substrate 2. The conductive liquid is close to the upper transparent substrate 1, and the insulating liquid is close to the lower transparent substrate 2.

[0101] The specific material selection, mixing ratio and physical properties of the insulating liquid and the conductive liquid are shown in Table 8, and the refractive index difference between the insulating liquid and the conductive liquid (refractive index difference Δn=|insulating liquid refractive index-conductive liquid refractive index|) is calculated, as shown in Table 8 below:

[0102] Table 8

[0103]

[0104] The high refractive index liquid lens provided in this embodiment uses a conductive liquid and an insulating liquid with different refractive indices, and the density difference between the two is less than <0.01g / cm 3 The insulating liquid includes 2-ethylnaphthalene and 1-fluoronaphthalene with high refractive index, and hexamethyldigermanium as a transmittance restoring agent, which is beneficial to expand the zoom range of the liquid lens and has higher stability.

[0105] Comparative Example 1

[0106] This comparative example provides a liquid lens, which is different from Example 1 in that hexaethyldisiloxane is not added to the insulating liquid, and the other process parameters are the same as those of Example 1.

[0107] The present invention uses a transmittance detector to measure the transmittance of the high refractive index liquid lenses of Examples 1 to 5 and the liquid lens of Comparative Example 1, and the results are shown in Table 9:

[0108] Table 9

[0109] serial number Example 1 Example 2 Example 3 Example 4 Example 5 Comparative Example 1 Transmittance (%) 97％ 98％ 97％ 97％ 96％ 88％

[0110] It can be seen from Table 9 that the liquid lenses in Examples 1 to 5 of the present invention use insulating liquid with a specific structure, the refractive index of the insulating liquid is ≥1.48, the refractive index difference between the conductive liquid and the insulating liquid is enlarged, and the transmittance is ≥95%, which effectively improves the zoom range.

[0111] Compared with Example 1, the transmittance of Comparative Example 1 is lower, which is mainly due to the addition of hexaethyldisiloxane as a transmittance restorer in the insulating liquid of Example 1 to increase the polarity difference between the conductive liquid and the insulating liquid, avoid high-temperature miscibility of the two phases of liquid or accelerate the recovery speed of miscibility.

[0112] The liquid lens of the present invention uses a high-refractive-index liquid containing an aromatic ring and a transmittance restoring agent containing aliphatic germane or aliphatic germanosilane as insulating liquid. After being kept at ≤70°C for a period of time (0 to 1000 hours), the insulating liquid and the conductive liquid still maintain high transparency, and the transmittance can reach 95% or more, which is beneficial to improving the technical advancement of the liquid lens and also ensures the stability of the liquid lens.

[0113] The applicant declares that the above is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention shall fall within the protection scope and disclosure scope of the present invention.

[0114] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0115] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. An insulating liquid, characterized in that: The insulating liquid is composed of a first solution and a second solution, the first solution is an aromatic compound, and the second solution is an aliphatic compound; The aromatic compound is selected from a combination of at least two of chlorobenzene, ethylbenzene, cyclohexylbenzene or 1-fluoronaphthalene; The aliphatic compound is selected from any one of hexaethyldisiloxane, hexamethyldisilane, hexamethyldigermanium, tetraethoxygermanium or triethylfluorosilane; The refractive index of the first solution is ≥1.48n D 20 ; The refractive index of the second solution is 1.30~1.48n D 20 ; The density of the first solution is 0.800-1.200 g / cm 3 ; The density of the second solution is 0.700-1.200 g / cm 3 ; The refractive index of the insulating liquid is ≥1.48n D 20 .

2. The insulating liquid according to claim 1, characterized in that The viscosity of the first solution is 0-25 mPa·s.

3. The insulating liquid according to claim 1, characterized in that: The viscosity of the second solution is 0-25 mPa·s.

4. A high refractive index liquid lens, characterized in that: The high refractive index liquid lens comprises a conductive liquid and the insulating liquid according to any one of claims 1 to 3.

5. The high refractive index liquid lens according to claim 4, characterized in that: The density difference between the conductive liquid and the insulating liquid is less than 0.01 g / cm 3 .

6. The high refractive index liquid lens according to claim 4, characterized in that: The conductive liquid includes any one of water, ethylene glycol or propylene glycol, or a combination of at least two of them.

7. The high refractive index liquid lens according to claim 4, characterized in that: The conductive liquid further comprises an additive, and the additive is an inorganic salt and / or an organic salt.

8. The high refractive index liquid lens according to claim 7, characterized in that: The content of the additive is 0.1-6 wt.%.

9. The high refractive index liquid lens according to claim 7, characterized in that: The inorganic salt includes sodium chloride and / or sodium bromide.

10. The high refractive index liquid lens according to claim 7, characterized in that: The organic salt includes potassium acetate and / or cesium acetate.

11. An application of the high refractive index liquid lens according to any one of claims 4 to 10, characterized in that: The high refractive index liquid lens is applied to cameras, mobile phones, endoscopes, telemeters and dental cameras.

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