CN110161674A - Liquid lens - Google Patents
Liquid lens Download PDFInfo
- Publication number
- CN110161674A CN110161674A CN201910359629.8A CN201910359629A CN110161674A CN 110161674 A CN110161674 A CN 110161674A CN 201910359629 A CN201910359629 A CN 201910359629A CN 110161674 A CN110161674 A CN 110161674A
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- Prior art keywords
- liquid
- lens
- conducting
- refractive index
- conducting liquid
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/004—Optical devices or arrangements for the control of light using movable or deformable optical elements based on a displacement or a deformation of a fluid
- G02B26/005—Optical devices or arrangements for the control of light using movable or deformable optical elements based on a displacement or a deformation of a fluid based on electrowetting
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/06—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the phase of light
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/12—Fluid-filled or evacuated lenses
- G02B3/14—Fluid-filled or evacuated lenses of variable focal length
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Mechanical Light Control Or Optical Switches (AREA)
Abstract
The present invention provides a kind of liquid lens, comprising: main part, the main part offer the lens cavity in through hole shape；Liquid, is contained in the lens cavity, and the liquid includes the first conducting liquid, insulating liquid and the second conducting liquid being sequentially placed；Packaged glass is matched with the main part, to seal the lens cavity；The refractive index for defining first conducting liquid is n1, insulating liquid refractive index be n2, the second conducting liquid refractive index be n3, work as n1With n2Between there are when difference, the first curved interface is formed by for adjusting the focal length of the liquid lens by the first conducting liquid and insulating liquid；Work as n2With n3Between there are when difference, the phase of light beam of second curved interface for adjusting the entrance liquid lens is formed by by insulating liquid and the second conducting liquid.Compared to the prior art, liquid lens of the invention can focus, be adjustable phase again, can also be transformed into as needed and take into account wide adjusting range and top adjustment precision.
Description
Technical field
The present invention relates to a kind of liquid lens, belong to imaging control optical technology, the technical field of optical information processing device.
Background technique
Based on the liquid zoom lens of medium electrowetting (EWOD), using applied voltage come the curvature of regulating liquid surface, in turn
The focal length of lens can be changed on a large scale.
Under normal circumstances, the lens material of liquid zoom lens is by two kinds of refractive index inequalities, immiscible electric conductivity water
Solution and non-conductive property oil composition, both liquid surfaces are capable of forming stable contact surface, play the role of lens.But
It is that under normal circumstances, the adjusting of liquid contact surface is to be not suitable for for zoom for phase modulation.
In view of this, it is necessory to propose to improve to existing liquid lens, to solve the above problems.
Summary of the invention
The purpose of the present invention is to provide a kind of liquid lens, which has both the function of focusing and phase modulation.
To achieve the above object, the present invention provides a kind of liquid lens, comprising:
Main part, the main part offer the lens cavity in through hole shape；
Liquid, is contained in the lens cavity, and the liquid includes the first conducting liquid being sequentially placed, insulating liquid and
Two conducting liquids；
Packaged glass is matched with the main part, to seal the lens cavity；
The refractive index for defining first conducting liquid is n1, insulating liquid refractive index be n2, the second conducting liquid folding
Penetrating rate is n3, work as n1With n2Between there are when difference, the first curved interface is formed by by the first conducting liquid and insulating liquid and is used
In the focal length for adjusting the liquid lens；Work as n2With n3Between there are when difference, formed by insulating liquid and the second conducting liquid
The second curved interface be used for adjusts entrance the liquid lens light beam phase.
Optionally, the refractive index n of first conducting liquid1With the refractive index n of insulating liquid2Between difference be located at
Between 0.01~1.
Optionally, the refractive index n of the insulating liquid2With the refractive index n of the second conducting liquid3Between difference be located at
Between 0.0001~0.01.
Optionally, on the axis direction of the lens cavity, the main part is made of an electrically conducting material, using as the liquid
The public electrode of body lens；The packaged glass is transparent electro-conductive glass, to draw the coordination electrode of the liquid lens.
Optionally, as the refractive index n of first conducting liquid1With the refractive index n of insulating liquid2Between difference be located at
Between 0.001~0.01, while the refractive index n of the insulating liquid2With the refractive index n of the second conducting liquid3Between difference position
When between 0.0001~0.001, first curved interface is used to carry out light beam the coarse adjustment of phase, second bending
Interface is used to carry out light beam the thin tuning of phase.
Optionally, immiscible two-by-two between first conducting liquid, insulating liquid and the second conducting liquid.
Optionally, the inner surface of the main part is coated with insulation dielectric layer, in the main part and the first conduction liquid
Capacitance structure is formed between body and between main part and the second conducting liquid, to control first curved interface and second curved
The shape at bent interface.
Optionally, second curved interface is equipped with surface-active layer.
Optionally, the focal length of the liquid lens is by formula
It calculates and obtains, wherein a is the internal diameter of lens cavity, θ0The second conducting liquid and lens when for applied voltage U being zero
The initial contact angle of cavity wall, εrFor the relative dielectric coefficient of the first conducting liquid and insulating liquid, γ12For the first conducting liquid
Interfacial tension between insulating liquid, e are the thickness of dielectric layer.
Optionally, meet relationship between the applied voltage U and the contact angle θ of the second conducting liquid and lens cavity wall
Formula:
The beneficial effects of the present invention are: the present invention by by liquid be designed to by be sequentially placed the first conducting liquid,
Insulating liquid and the second conducting liquid composition, thus when the refractive index of the first conducting liquid and the refractive index of insulating liquid are in the presence of poor
When value, being formed by the first curved interface by the first conducting liquid and insulating liquid can be used for focusing；And work as insulating liquid
Refractive index and the second conducting liquid refractive index there are when difference, be formed by second by insulating liquid and the second conducting liquid
Curved interface can be used for adjusting phase, realize the function that liquid lens can focus, be adjustable phase again.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of liquid lens of the invention.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, right in the following with reference to the drawings and specific embodiments
The present invention is described in detail.
Refering to Figure 1, can be applied to include focusing and phase modulation function the present invention provides a kind of liquid lens
Optical system takes into account phase modulation compensating action while realizing focusing or big phase adjustment range combines high adjusting
The occasion of precision.Such as: optical aperture synthesis telescope technology, camera, Mobile phone mirror head etc..
The liquid lens includes main part (not shown), the liquid being housed in main part and is used for and the main body
The packaged glass (not shown) that portion matches.The main part offers the lens cavity in through hole shape；The main part is by conduction
Material is made, and is used using the public electrode as the liquid lens.The fluid storage in the lens cavity, and including according to
The first conducting liquid 1, insulating liquid 2 and the second conducting liquid 3 of secondary placement.
The packaged glass covers in the outside of the lens cavity, to seal the lens cavity.Preferably, the encapsulation glass
Glass is transparent electro-conductive glass and is provided with two panels, to seal the both ends of the lens cavity respectively, first conducting liquid 1 with
Wherein a piece of packaged glass is in contact, second conducting liquid 3 is in contact with other a piece of packaged glass, so set, making
Two coordination electrodes obtained in liquid lens can be drawn by two panels packaged glass respectively.
It is immiscible two-by-two between first conducting liquid 1, insulating liquid 2 and the second conducting liquid 3, so as to
The first curved interface 4 is formed between one conducting liquid 1 and insulating liquid 2, the shape between insulating liquid 2 and the second conducting liquid 3
At the second curved interface 5.On the axis direction of the lens cavity, define first conducting liquid 1 with a thickness of L1, insulation
Liquid 2 with a thickness of L2, the second conducting liquid 3 with a thickness of L3, then L2>L3>L1；But it should not be as limit.
The refractive index for defining first conducting liquid 1 is n1, insulating liquid 2 refractive index be n2, the second conducting liquid 3
Refractive index be n3, work as n1With n2Between there are when difference and larger difference, formed by the first conducting liquid 1 and insulating liquid 2
The first curved interface 4 can be used for adjusting the focal length of the liquid lens；Work as n2With n3Between there are when difference and smaller difference,
Being formed by the second curved interface 5 by insulating liquid 2 and the second conducting liquid 3 can be used for adjusting the light of the entrance liquid lens
The phase of beam.
Specifically, as the refractive index n of first conducting liquid 11With the refractive index n of insulating liquid 22Between difference
When between 0.01~1, first curved interface 4 plays a part of focusing.As the refractive index n of the insulating liquid 22With
The refractive index n of second conducting liquid 33Between difference between 0.0001~0.01 when, second curved interface 5 plays
The effect of phase modulation.
It, under normal circumstances, can be by further decreasing in the second curved interface 5 and lens cavity in order to improve phase modulation precision
Initial contact angle between wall is realized, while being arranged surface-active layer in second curved interface 5.When specific works,
The focal length that liquid lens should be adjusted first with the first curved interface 4 recycles the second curved interface after Focussing
5 adjust the phase of light beam.
It should be understood that phase modulation function is matched just to complete for the fine tuning of phase, adjustable range is not under normal circumstances
100 λ can be greater than, otherwise precision is difficult to reach requirement, so the phase adjusted effect of the second curved interface 5 is not to first
Curved interface 4 is focused later phase compensation.
Certainly, if wanting to reach large-scale phase adjusted, while degree of regulation is taken into account again, then can pass through reasonable distribution liquid
Refringence between body, to make the first curved interface 4 play the function of coarse adjustment phase, and the second curved interface 5 plays fine tuning phase
Function.At this point, the refractive index n of first conducting liquid 11With the refractive index n of insulating liquid 22Between difference be located at
Between 0.001~0.01, while the refractive index n of the insulating liquid 22With the refractive index n of the second conducting liquid 33Between difference
Between 0.0001~0.001.It can be seen that: the present invention can adjust n according to actual needs1With n2And n2With n3Between difference
Size, the phase modulation function of the focusing of the first curved interface of Lai Shixian 4 or phase modulation function and the second curved interface 5.
The focal length of the liquid lens is by formula
It calculates and obtains, wherein a is the internal diameter of lens cavity, θ0The second conducting liquid 3 when for applied voltage U being zero with thoroughly
The initial contact angle of mirror cavity wall, εrFor the relative dielectric coefficient of the first conducting liquid 1 and insulating liquid 2, γ12For the first conduction
Interfacial tension between liquid 1 and insulating liquid 2, e are the thickness of dielectric layer.
Wherein, meet relational expression between applied voltage U and the second conducting liquid 3 and the contact angle θ of lens cavity wall:
By above-mentioned formula (1) it can be seen that if other conditions are constant, as refractive index n1With refractive index n2(example when differing larger
Such as larger than 0.01, particularly greater than 0.1 or more), the first curved interface 4 plays focusing action；And work as refractive index n3And refraction
Rate n2When differing very little (being, for example, less than 0.01, especially less than 0.0001 or less), the second curved interface 5 does not exercise focusing function
Can, but for adjusting the phase into the light beam of lens cavity, and axis of the adjusting along lens cavity under electrowetting effect effect
Phase Φ variable quantity (the δ Φ=2 π/λ * δ △, δ △=(n of the light beam of direction transmission2-n3) * δ h, δ h is the second curved interface 5
The displacement variable on vertex).
The inner surface of the main part be coated with insulation dielectric layer, between the main part and the first conducting liquid 1,
And capacitance structure is formed between main part and the second conducting liquid 3, so that after application of a voltage, capacitance structure is electrically charged and puts
Electricity, and then convenient for controlling the shape of first curved interface 4 and the second curved interface 5.
As lens in use, the inner wall of lens cavity needs to do hydrophobic treatment, to improve initially connecing between liquid-inner wall
Feeler, to make liquid lens that there is biggish adjustable range；As phase modulation in use, the inner wall of lens cavity should select suitably
Insulation dielectric layer to reduce the initial contact angle between liquid-inner wall, or in the second curved interface 5 adds surface-active
Layer, with the initial contact angle being further reduced between liquid-inner wall, to make liquid lens phase adjusted essence with higher
Degree.
The phase modulation principle of fluid present invention lens are as follows: apply control voltage respectively on main part and two panels packaged glass,
So that the interfacial tension between the second conducting liquid 3 and lens cavity wall is reduced because of the effect of electrowetting effect, to change
The shape of second curved interface 5, and the second curved interface 5 is made to move δ h displacement along the axis direction of lens cavity.Preferably one
In embodiment, after selecting suitable insulative dielectric layer material or applying surface-active layer, may make the second conducting liquid 3 with thoroughly
For contact angle θ between mirror cavity wall less than 95 °, the control precision of δ h is less than 0.1mm.Work as refringence | n2-n3| choose 0.0001
When~0.01 range, light path degree of regulation δ △=(n2-n3) * δ h can be controlled between 0.01~1 μm, meet the need of different occasions
It asks.
Similarly, if the first curved interface 4 also serves as phase modulation effect, work as refringence | n1-n2| selection 0.001~
When 0.01 range, light path degree of regulation δ △=(n2-n3) * δ h can be controlled between 0.1~1 μm, it can be used as coarse adjustment mutually to increase
Phase modulation range can meet a wide range of, high-precision phase modulation demand in conjunction with fine-tuning for the second curved interface 5.
Following description part will carry out the present invention is described in detail with specific embodiment.
1: the first conducting liquid 1 of embodiment selects 10%NaCL aqueous solution or LiCL aqueous solution or NaSO4 aqueous solution, folding
The rate of penetrating is about 1.34；Insulating liquid 2 selects turpentine oil, and the refractive index under room temperature is 1.4721, in this way, the first curved interface 4 rises
To focusing action；Second conducting liquid 3 selects ionic liquid [P666 (14)] [Deca], and refractive index is 1.47242 under room temperature, with
The refractive index 0.00032 of insulating liquid 2, when δ h takes 0.1mm, phase modulation (light modulation journey) precision of the second curved interface 5 can
Up to 0.03 μm, for the green light of λ=0.55 μm, 0.06 λ is reached, can meet the needs of most of imaging situations.
2: the first conducting liquid 1 of embodiment selects the mixing of+60% sugar juice of 5%NaCL aqueous solution, and refractive index is about
1.462；Insulating liquid 2 selects turpentine oil, and the refractive index under room temperature is 1.4721, the refractive index with the first conducting liquid 1
0.01, when δ h takes 0.1mm, the first curved interface 4 constitutes the liquid phase converter that phase modulation precision is 1 μm, though at this point, degree of regulation
It is so relatively thick, but phase modulation range is considerably increased, the thin phase modulation function of 1 the second curved interface 5, the two can combine in conjunction with the embodiments
At wide adjusting range, the liquid phase converter of top adjustment precision.
Embodiment 3: insulating liquid 2 selects turpentine oil；First conducting liquid 1 and the second conducting liquid 3 select similarly to lead
Electro-hydraulic body, such as ionic liquid [EM2N (CH2) 2OH] [ESO4], and refractive index is 1.47303 at normal temperature.But first is curved
The thickness for the first insulation dielectric layer that bent interface 4 is contacted is thicker than the second insulation dielectric layer that the second curved interface 5 is contacted
Spend much smaller, such as the thickness of the first insulation dielectric layer takes 3um, and the thickness of the second insulation dielectric layer takes 10um, then according to public affairs
Formula (2) is it is found that the contact angle of the first curved interface 4 adjusts 10 times or more that sensitivity is about the second curved interface 5.As a result,
The degree of regulation of the δ h of two curved interfaces 5 is 10 times higher than the first curved interface 4, and the first curved interface 4 can be used as coarse adjustment phase
It uses, and the second curved interface 5 is then used as thin tuning phase.
Certainly, 4 He of the first curved interface can also be set according to δ h and liquid-inner wall initial contact angle non-linear relation
The different initial contact angle of second curved interface 5 completes the distribution of coarse adjustment, fine tuning role, for example, the liquid of the first curved interface 4
Body-inner wall contact surface coated with hydrophobic layer makes its initial contact angle be greater than 120 °, uses as coarse adjustment phase；Second curved interface 5
Liquid-inner wall contact surface not coated with hydrophobic layer, or even addition surfactant (NaLS etc.) makes its initial contact
Less than 95 ° of angle (being greater than 90 °), uses as fine tuning phase.
The present invention combines micro-fluidic optical technology with Modern Optics Technology, has had devised one kind both based on liquid lens
The method for being adjustable focal length, being adjustable phase again, while can also be transformed into as needed and take into account wide adjusting range and top adjustment essence
The scheme of degree.Liquid lens of the invention has many advantages, such as that structure is simple, is easy production, is low in cost, has economic and technical
It is worth, advantage is that imaging system is miniaturized, and therefore, the optics phase modulation method of the liquid lens positions and is small-sized
Imaging system can be applicable to the products such as mobile phone, digital camera, miniature webcam, endoscope.
In conclusion liquid lens of the invention by by liquid be designed to by be sequentially placed the first conducting liquid 1, absolutely
Edge liquid 2 and the second conducting liquid 3 composition, thus as the refractive index n of the first conducting liquid 11With the refractive index n of insulating liquid 22
Between there are when difference and larger difference, being formed by the first curved interface 4 by the first conducting liquid 1 and insulating liquid 2 can use
In focusing；And work as the refractive index n of insulating liquid 22With the refractive index n of the second conducting liquid 33Between there are difference and differences
When smaller, being formed by the second curved interface 5 by insulating liquid 2 and the second conducting liquid 3 can be used for adjusting phase, realize liquid
Body lens can focus, be adjustable the function of phase again.
The above examples are only used to illustrate the technical scheme of the present invention and are not limiting, although referring to preferred embodiment to this hair
It is bright to be described in detail, those skilled in the art should understand that, it can modify to technical solution of the present invention
Or equivalent replacement, without departing from the spirit and scope of the technical solution of the present invention.
Claims (10)
1. a kind of liquid lens characterized by comprising
Main part, the main part offer the lens cavity in through hole shape；
Liquid, is contained in the lens cavity, and the liquid includes the first conducting liquid being sequentially placed, insulating liquid and second leads
Electro-hydraulic body；
Packaged glass is matched with the main part, to seal the lens cavity；
The refractive index for defining first conducting liquid is n1, insulating liquid refractive index be n2, the second conducting liquid refractive index
For n3, work as n1With n2Between there are when difference, the first curved interface is formed by for adjusting by the first conducting liquid and insulating liquid
Save the focal length of the liquid lens；Work as n2With n3Between there are when difference, be formed by by insulating liquid and the second conducting liquid
Two curved interfaces are used to adjust the phase into the light beam of the liquid lens.
2. liquid lens according to claim 1, it is characterised in that: the refractive index n of first conducting liquid1With insulation
The refractive index n of liquid2Between difference between 0.01~1.
3. liquid lens according to claim 1, it is characterised in that: the refractive index n of the insulating liquid2With the second conduction
The refractive index n of liquid3Between difference between 0.0001~0.01.
4. liquid lens according to claim 1, it is characterised in that: the main part is made of an electrically conducting material, using as
The public electrode of the liquid lens；The packaged glass is transparent electro-conductive glass, to draw the control of the liquid lens
Electrode.
5. liquid lens according to claim 1, it is characterised in that: as the refractive index n of first conducting liquid1With it is exhausted
The refractive index n of edge liquid2Between difference between 0.001~0.01, while the refractive index n of the insulating liquid2With second
The refractive index n of conducting liquid3Between difference between 0.0001~0.001 when, first curved interface be used for light
The coarse adjustment of Shu Jinhang phase, second curved interface are used to carry out light beam the thin tuning of phase.
6. liquid lens according to claim 1, it is characterised in that: first conducting liquid, insulating liquid and second
It is immiscible two-by-two between conducting liquid.
7. liquid lens according to claim 1, it is characterised in that: the inner surface of the main part is coated with insulative dielectric
Layer, to form capacitance structure between the main part and the first conducting liquid and between main part and the second conducting liquid, with
Control the shape of first curved interface and the second curved interface.
8. liquid lens according to claim 1, it is characterised in that: second curved interface is equipped with surface-active
Layer.
9. liquid lens according to claim 1, it is characterised in that: the focal length of the liquid lens is by formula
It calculates and obtains, wherein a is the internal diameter of lens cavity, θ0In the second conducting liquid and lens cavity when for applied voltage U being zero
The initial contact angle of wall, εrFor the relative dielectric coefficient of the first conducting liquid and insulating liquid, γ12For the first conducting liquid and absolutely
Interfacial tension between edge liquid, e are the thickness of dielectric layer.
10. liquid lens according to claim 9, it is characterised in that: the applied voltage U and the second conducting liquid and thoroughly
Meet relational expression between the contact angle θ of mirror cavity wall:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910359629.8A CN110161674A (en) | 2019-04-30 | 2019-04-30 | Liquid lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910359629.8A CN110161674A (en) | 2019-04-30 | 2019-04-30 | Liquid lens |
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| Publication Number | Publication Date |
|---|---|
| CN110161674A true CN110161674A (en) | 2019-08-23 |
Family
ID=67633254
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910359629.8A Pending CN110161674A (en) | 2019-04-30 | 2019-04-30 | Liquid lens |
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| Country | Link |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110045495A (en) * | 2019-05-06 | 2019-07-23 | 南京邮电大学 | A kind of optics phase modulation method based on liquid lens |
| CN111399093A (en) * | 2020-04-07 | 2020-07-10 | Oppo广东移动通信有限公司 | Mobile terminal and image acquisition module and liquid lens thereof |
| CN113281906A (en) * | 2021-04-25 | 2021-08-20 | 凤凰光学股份有限公司 | Detachable augmented reality display equipment and system thereof |
| US20220099955A1 (en) * | 2020-09-30 | 2022-03-31 | Optotune Consumer Ag | Tunable Liquid Lens |
| CN114815016A (en) * | 2022-04-22 | 2022-07-29 | 上海酷聚科技有限公司 | Liquid lens and preparation method thereof |
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| CN105390066A (en) * | 2015-12-02 | 2016-03-09 | 昆山龙腾光电有限公司 | Display device |
| US9442225B2 (en) * | 2005-05-14 | 2016-09-13 | Holochip Corporation | Fluidic lens with manually-adjustable focus |
| CN109709668A (en) * | 2019-02-02 | 2019-05-03 | 北京空间机电研究所 | A kind of automatic phase control unit and adjusting method |
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| US9442225B2 (en) * | 2005-05-14 | 2016-09-13 | Holochip Corporation | Fluidic lens with manually-adjustable focus |
| CN101441284A (en) * | 2008-12-12 | 2009-05-27 | 南京邮电大学 | Electric tuning micro-flow control double-zoom lens |
| CN105390066A (en) * | 2015-12-02 | 2016-03-09 | 昆山龙腾光电有限公司 | Display device |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110045495A (en) * | 2019-05-06 | 2019-07-23 | 南京邮电大学 | A kind of optics phase modulation method based on liquid lens |
| CN110045495B (en) * | 2019-05-06 | 2021-06-08 | 南京邮电大学 | Optical phase modulation method based on liquid lens |
| CN111399093A (en) * | 2020-04-07 | 2020-07-10 | Oppo广东移动通信有限公司 | Mobile terminal and image acquisition module and liquid lens thereof |
| US20220099955A1 (en) * | 2020-09-30 | 2022-03-31 | Optotune Consumer Ag | Tunable Liquid Lens |
| CN113281906A (en) * | 2021-04-25 | 2021-08-20 | 凤凰光学股份有限公司 | Detachable augmented reality display equipment and system thereof |
| CN114815016A (en) * | 2022-04-22 | 2022-07-29 | 上海酷聚科技有限公司 | Liquid lens and preparation method thereof |
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Application publication date: 20190823 |