CN102096126A - Ion liquid-based microfluidic varifocus lens - Google Patents
Ion liquid-based microfluidic varifocus lens Download PDFInfo
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- CN102096126A CN102096126A CN 201110004240 CN201110004240A CN102096126A CN 102096126 A CN102096126 A CN 102096126A CN 201110004240 CN201110004240 CN 201110004240 CN 201110004240 A CN201110004240 A CN 201110004240A CN 102096126 A CN102096126 A CN 102096126A
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Abstract
The invention discloses an ion liquid-based microfluidic varifocus lens. The characteristic of the basic structure of the ion liquid-based microfluidic varifocus lens lies in that a conductive inner core with a lens hole can accommodate 'conductive fluid and insulating fluid'. The inner core (3) is a conductive panel with a cylindrical through hole, and all the surfaces are coated with an insulation layer (7) and a hydrophobic layer (8); gaps between an upper cover plate (1) and a cover plate (2) and a through hole form a lens cavity for storing a liquid lens material; the inner core (3) made from a conducing material is used as an electrode, and the lower cover plate (2) coated with a transparent conductive layer (6) is used as a conductive electrode; and insulating fluid (4) and ion liquid (5) are filled in the lens cavity. The combination of non-conductive oil (4) with specific parameters and ion liquid (5) is selected, so the varifocus liquid system has the function of a convex lens without voltage or with a low voltage; meanwhile, the continuous large-range adjustment to the focus of the convex lens from the short focus length to the far distance can be realized.
Description
Technical field
Patent of the present invention relates to based on ion liquid liquid zoom lens structure and principle of work thereof, belongs to the technical field of photoelectronic imaging, photoelectric sensing and optical information processing device.
Background technology
Micro-fluidic optical is a significant new technology, it combines modern microflow control technique and low-light electronic technology, develop a class and can change, have the optical integrated device and the system of structural rearrangement and adaptive adjustment capability, have important application prospects [1] in fields such as sensing, communication, information processings according to external environment.
Liquid zoom lenticule can change the luminous flux and the visual field performance of micro-optical systems, have good handling and adaptability, can be applicable to optical switch and systems such as light interconnection, three-dimensional light storage, static digital camera, medical science endoscope, telescope and microscope as replacing conventional lenses.Existing liquid zoom lens technology mainly is divided into two kinds, a kind of liquid lens that changes pressure controlling liquid surface curvature change that is based on, and another kind is based on electrowetting effect.Based on the canonical form of the liquid lens that changes pressure controlling liquid surface curvature change, be Mechanical Driven type liquid lens based on the liquid lens that changes pressure controlling liquid surface curvature change.Because this lens belong to machinery control, structure is not compact, is difficult for realizing the array defective, has therefore restricted it and has further developed.The liquid zoom lens of Electrowetting type is to adopt two kinds of immiscible liquid, wherein a kind of is electrolytic solution, a kind of is dielectric, it comprises the first substrate glasses plate, the second substrate glasses plate, first metal electrode, second metal electrode, hydrophobic nature insulation course, electrolyte solution, changes contact angle between two kinds of liquid and solids container by applying different voltages, thereby change the radius-of-curvature at interface between two kinds of liquid, realize zoom.Be compared to the liquid lens of mechanical zoom mode, it is fast to have response speed based on the zoom lens of Electrowetting type, continuity is good during zoom, volume is little, in light weight, low in energy consumption, and all parts can being made of one, the anti-seismic performance of lens is fine, comparatively ripe packing forms, adopts automatically controlledly, and is easy to realize advantage such as array, therefore, caused domestic and international many scholars' interest
[2-4]
At present based on the zooming liquid lens of Electrowetting type, not that lens are concavees lens under the very high situation not applying voltage or applying voltage, focal length is a negative value; Along with the increase of two inter-electrode voltages, to horizontal variation, corresponding Concave Mirrors Focus increases to infinite two liquid surfaces gradually from convex; Liquid surface is to dielectric fluid one lateral bending song subsequently, and the corresponding liquid lens change convex lens into by concavees lens.The people such as S.Kuiper of Philips company
[5]Discover: when voltage during less than 100V, liquid surface is convex, and corresponding liquid lens is concavees lens.When voltage was elevated to 100V, liquid surface was horizontal.Continue to increase voltage, the corresponding liquid lens are changed to convex lens by concavees lens.When voltage continuation rising, the degree of crook at interface increases, and corresponding focal length of convex lens diminishes.This lenticular focal length minimum can reach 5 centimetres.Want to make the focal length of these convex lens to become shorter, must apply higher voltage or reduce the thickness of insulation course.Yet, high voltage can cause the puncture of insulation course and thickness of insulating layer reduce obviously can increase the difficulty of technology and then influence device lifetime.Simple be restricted by reduction voltage or the method that reduces thickness of insulating layer.In addition, the used electric conductor salt solusion of aforesaid liquid lens requires very high to environment temperature, cisco unity malfunction all under thermal extremes or low temperature.So traditional zooming liquid lens based on Electrowetting type is difficult to replace conventional optical systems.
This patent has designed based on ion liquid micro-fluidic liquid zoom lens.Ionic liquid is meant and is being in a liquid state under the temperature near room temperature or the room temperature, and the material of being made up of zwitterion.Ionic liquid has the physicochemical property of a lot of uniquenesses, as steam force down, non-volatile, not flammable, advantages such as thermal capacity is big, ionic conductivity is high, electrochemical window is wide, substance dissolves is good, extracting power is good, phase stability is good, Heat stability is good, water stability is good, ph stability is good, while ionic liquid body fluid journey wide (can reach 400 ℃), can improve ion liquid physical property and chemical property by selecting suitable negative ion or finely tuning cationic alkyl chain.In view of ion liquid above-mentioned special performance, selection possesses the combination of the ionic liquid and the dielectric fluid of special parameter according to the design needs, and make it satisfy one of following condition: the refractive index of the conductive fluid in the time of conducting liquid one lateral bending song of the curved interface between (1) conductive fluid and the dielectric fluid is greater than dielectric fluid; (2) refractive index of the conductive fluid in the time of dielectric fluid one lateral bending song of the curved interface between conductive fluid and the dielectric fluid is less than dielectric fluid.Satisfying liquid zoom lens that the conductive fluid of above-mentioned condition and dielectric fluid form is not applying voltage or is applying the function that all possesses convex lens under the situation of low-voltage.The satisfy condition focal length of liquid zoom convex lens of (1) of the combination of ionic liquid and insulator shortens along with the increase that applies voltage, and focal length is maximum when making alive not.These lens are adjustable continuously in short burnt scope, realize the ultrashort focal length much smaller than 5 centimetres simultaneously; The satisfy condition focal length of liquid zoom convex lens of (2) of the combination of ionic liquid and insulator increases along with the increase that applies voltage, and focal length is minimum when making alive not.Continue to increase voltage, interface will be and be carried out the transition to horizontally again to recess by convex, and this moment, the focal length of lens was a negative value, and then the transformation of realization lens from convex lens to concavees lens.In addition, these two kinds of liquid convex lens combinations can also be realized the wide variation of focal length from ultrashort focal length to the infinite distance by control voltage.In sum, of the present inventionly do not need to realize convex lens and reach little focal length by the thickness that applies high voltage or reduce insulation course based on ion liquid liquid zoom lens, thereby reduced voltage and to the requirement of technology, the stability and the life-span of also having improved device.In addition, ion liquid physico-chemical property has also determined this liquid zoom lens not only to be fit to the working environment of room temperature, also is applicable to high temperature (+90 ℃) and low-temperature working environment (40 ℃).Therefore, have important techniques and be worth and economic worth, will be widely used at photoelectronic imaging and optical information processing field.
List of references:
[1]Demetri?Psaltis，Stephen?R.Quake2&Changhuei?Yang，Developing?optofluidictechnology?through?the?fusion?of?microfluidics?and?optics，Nature，Vol.442，No.27，(2006)381-386
[2]T.Krupenkin，S.Yang，and?P.Mach，Tunable?liquid?microlens，Appl.Phys.Lett.，Vol.82，(2003)316-318.
[3]Armin?Werber?and?Hans?Zappe，Tunable?microfluidic?microlenses，AppliedOptics，Vol.44，No.16，(2005)3238-3245.
[4]Runling?Peng，Jiabi?Chen，Cheng?Zhu?and?Songlin?Zhuang，Design?of?a?zoomlens?without?motorized?optical?elements，Optics?Express，Vol.15，No.11，(2007)6664-6669
[5]S.Kuiper，and?B.H.W?Hendriks，Variable?focus?liquid?lens?for?miniature?cameras，Appl.Phys.Lett.，Vol.85，No.7，(2004)1128-1130.
Summary of the invention
Technical matters: the object of the invention is to propose to adopt the ionic liquid new material as the conducting liquid of liquid lens and the liquid zoom lens that adopts this conducting liquid; This focus variable liquid lens is not applying the function that realizes convex lens under voltage or the low voltage condition, and the continuous adjustable problem in solving the ultrashort focal length of convex lens and realize from ultrashort focal length to the infinite distance scope under low-voltage; Also greatly reduce the requirement of liquid zoom lens simultaneously to environment temperature.
Technical scheme: of the present inventionly comprise inner core and be positioned at the upper cover plate above the inner core and be positioned at lower cover slip below the inner core based on ion liquid micro-fluidic liquid zoom lenticule; Inner core is the conducting plate with cylindric through hole, and all surfaces is coated with insulation course and hydrophobic layer; Space between upper cover plate and lower cover slip and the through hole forms lens cavity, is used for the storage of liquids lens material; Place two kinds in the lens cavity and be separated from each other and immiscible each other liquid, have different refractive indexes, be respectively dielectric fluid and conductive fluid, these two kinds of liquid constitute lens medium; Inner core adopts conductive material to make and as an electrode, the transparency conducting layer that applies on the lower cover slip is as another conductive electrode; Curved interface between two kinds of liquid of dielectric fluid and conductive fluid plays lensing, changes the shape of curved interface to regulate the focal length of lens by apply voltage between two electrodes; Dielectric fluid and conductive fluid constitute a zooming liquid lens system.
Described conductive fluid is a kind of ionic liquid.
Described conductive fluid is two or more ion liquid potpourri.
Described conductive fluid is the potpourri of ionic liquid and electrolyte salt solution.
Added voltage is DC voltage, exchanges and decide voltage or AC frequency conversion voltage frequently.
Beneficial effect: according to above narration as can be known, the present invention has following characteristics:
The present invention combines microflow control technique with Modern Optics Technology, designed a kind ofly based on ion liquid micro-fluidic liquid zoom lens, has important techniques and is worth.The micro-fluidic device of the present invention design has simple in structure, easy making, advantage such as with low cost.
The innovation part is:
1) micro-fluidic liquid zoom lens possesses the function of convex lens in the situation that does not apply voltage or apply low-voltage.
2) focal length of micro-fluidic liquid zoom convex lens increases along with voltage increases continuously, and it is adjustable continuously to be implemented in interior focal length on a large scale.
3) focal length of micro-fluidic liquid zoom convex lens does not increase counter subtracting along with voltage increases, and is implemented in the ultrashort focal range adjustable continuously.
4) micro-fluidic liquid zoom convex lens combination realizes in focal length is from ultrashort focal length to the infinite distance scope adjustable continuously.
5) the required driving voltage of focal length that changes micro-fluidic liquid zoom convex lens reduces greatly.
Description of drawings
Fig. 1 be liquid lens of the present invention not during making alive the curved interface between lens synoptic diagram (a) conductive fluid and the dielectric fluid to conducting liquid one lateral bending song, ion liquid refractive index is higher than the refractive index of non-conductive oil simultaneously, (b) the curved interface between conductive fluid and the dielectric fluid is to dielectric fluid one lateral bending song, and ion liquid refractive index is lower than the refractive index of non-conductive oil simultaneously
Fig. 2 is the focal length variations synoptic diagram of liquid lens of the present invention lens when applying certain voltage.(a) the curved interface between conductive fluid and the dielectric fluid is to conducting liquid one lateral bending song, ion liquid refractive index is higher than the refractive index of non-conductive oil simultaneously, (b) the curved interface between conductive fluid and the dielectric fluid is to dielectric fluid one lateral bending song, and ion liquid refractive index is lower than the refractive index of non-conductive oil simultaneously.
Fig. 3 is a structural representation of the present invention, comprising: upper cover plate 1, lower cover slip 2, inner core 3, dielectric fluid 4, conductive fluid 5, transparency conducting layer 6, insulation course 7, hydrophobic layer 8.
Embodiment
Of the present invention based on ion liquid micro-fluidic liquid zoom lens, the inner core between upper cover plate and lower cover slip is the conducting plate with cylindric through hole, and all surfaces is coated with insulation course and hydrophobic layer; Space between upper cover plate and lower cover slip and the cylindric through hole forms lens cavity, is used for the storage of liquids lens material.The conductive fluid that is contained among the present invention in the through hole is an ionic liquid, and it can stably be operated in operation and storage temperature range, and has and essentially identical density of insulating solution and viscosity.These two kinds of liquid are separated from each other by the interface and do not mix mutually each other, have different refractive indexes and surface tension; Choose electric conductor and insulator with special parameter, two kinds of liquid are separated from each other and do not mix mutually each other, make its satisfy refractive index when the curved interface conductive fluid in the time of conducting liquid one lateral bending song between conductive fluid and the dielectric fluid greater than the curved interface between dielectric fluid or conductive fluid and the dielectric fluid to dielectric fluid one lateral bending song the time refractive index of conductive fluid less than dielectric fluid.In not applying voltage or low voltage range, the curved interface of dielectric fluid 4, conductive fluid 5 possesses the function of convex lens.Have certain thickness insulation course (7) in inner core (3) surface-coated, avoid inner core to contact with the ionic liquid of substrate and conduction.Inner core adopts conductive material to make and as an electrode, the transparency conducting layer that applies on the lower cover slip is as another conductive electrode; To carrying out hydrophobic treatments in the mirror chamber, make the Contact Boundary of two kinds of liquid form flexure plane naturally.After applying voltage between two electrodes, the ionic liquid of conduction and the interfacial tension between the sidewall reduce because of the effect of electrowetting effect, change the shape at contact liq interface, thereby realize the change of focal length of convex lens.
Compare with the traditional liquid that is used for liquid lens, adopt the liquid zoom lens module of ionic liquid among the present invention as conductive fluid, really realize that liquid microlens is not applying the function that possesses convex lens under voltage or the low voltage, and solve this focal length of convex lens short burnt to the scope of infinite distance continuously adjustable problem.At the combination of different ionic liquid and insulator, the focal length variations trend of these liquid convex lens can be divided into two classes.A kind of is along with the increase that applies voltage, and the degree of crook at curved interface increases, and corresponding focal length of convex lens shortens, and focal length be a maximum when making alive not.These lens are adjustable continuously in short burnt scope, and then realize ultrashort focal length; Another kind be not during making alive focal length for minimum, focal length increase along with these liquid convex lens of the increase that applies voltage, continue to increase voltage, interface will be carry out the transition to by convex horizontal again to recess, this moment, the focal length of lens was a negative value, and then realized the transformation of lens from convex lens to concavees lens.In addition, with this liquid convex lens of two types combination, can also be implemented in the wide variation of focal length from ultrashort focal length to the infinite distance in the low voltage range by control voltage.
Hereinafter, describe preferred embodiment of the present invention with reference to the accompanying drawings in detail.Yet these embodiment are used for illustration purpose and are not intended to limit the present invention.
Example when Fig. 1 shows focus variable liquid lens according to the present invention and do not apply voltage.Fig. 1 (a) illustrate when dielectric fluid and the curved interface of ionic liquid to conducting liquid one lateral bending song the time ion liquid refractive index greater than the situation of dielectric fluid.Fig. 1 (b) illustrates refractive index when the conductive fluid to dielectric fluid one lateral bending song time of the curved interface between conductive fluid and the dielectric fluid less than dielectric fluid.
Specific embodiment 1: be used for the ion liquid refractive index of conducting solution of liquid lens and surface tension according to the present invention all greater than dielectric fluid.Ionic liquid can be C
8H
15IN
2(density 1.2124g/cm
3, refractive index 1.572, surface tension 54.7mN/m), dielectric fluid adopts KF56 silicone oil (density 0.995g/cm
3, refractive index 1.497, surface tension 26.5mN/m) and a small amount of organic additive phenyl-bromide (density 1.495g/cm
3, refractive index 1.5590, surface tension 38.14mN/m) potpourri.The density variation of electric conductor and dielectric fluid is regulated by the blending ratio of silicone oil and organic additive.The difference of viscosity can be regulated by the mode that adds surfactant in electric conductor.
Specific embodiment 2: be used for the ion liquid refractive index of conducting solution of liquid lens and surface tension according to the present invention all less than dielectric fluid.Conductive fluid adopts surface tension and less ionic liquid [Bmim] BF of refractive index
4(density 1.120g/cm3, refractive index 1.42, surface tension 46.6mN/m), dielectric fluid adopt the phenyl methyl siloxane with high index of refraction and good electric wet performance.(ρ=2.96kg/m3) regulate, refractive index of the dielectric fluid of mixing about 1.55 and surface tension are all greater than conductive fluid by several percentage points of carbon tetrabormated compounds of dissolving in the phenyl methyl siloxane for the density variation of conductive fluid and dielectric fluid.The difference of viscosity can be regulated by the mode that adds surfactant in electric conductor.
Claims (5)
1. one kind based on ion liquid micro-fluidic liquid zoom lenticule, it is characterized in that these lens comprise inner core (3) and are positioned at the upper cover plate (1) above the inner core (3) and are positioned at the following lower cover slip (2) of inner core (3); Inner core (3) is the conducting plate with cylindric through hole, and all surfaces is coated with insulation course (7) and hydrophobic layer (8); Space between upper cover plate (1) and lower cover slip (2) and the through hole forms lens cavity, is used for the storage of liquids lens material; Place two kinds in the lens cavity and be separated from each other and immiscible each other liquid, have different refractive indexes, be respectively dielectric fluid (4) and conductive fluid (5), these two kinds of liquid constitute lens medium; Inner core (3) adopts conductive material to make and as an electrode, lower cover slip (2) is gone up the transparency conducting layer (6) of coating as another conductive electrode; Curved interface between (5) two kinds of liquid of dielectric fluid (4) and conductive fluid plays lensing, changes the shape of curved interface to regulate the focal length of lens by apply voltage between two electrodes; Dielectric fluid (4) and conductive fluid (5) constitute a zooming liquid lens system.
2. according to claim 1 based on ion liquid micro-fluidic liquid zoom lenticule, it is characterized in that described conductive fluid is a kind of ionic liquid.
3. according to claim 1 based on ion liquid micro-fluidic liquid zoom lenticule, it is characterized in that described conductive fluid is two or more ion liquid potpourri.
4. according to claim 1 based on ion liquid micro-fluidic liquid zoom lens, it is characterized in that described conductive fluid is the potpourri of ionic liquid and electrolyte salt solution.
5. according to claim 1 based on ion liquid micro-fluidic liquid zoom lens, it is characterized in that added voltage is DC voltage, exchanges and decide voltage or AC frequency conversion voltage frequently.
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| CN 201110004240 CN102096126A (en) | 2011-01-07 | 2011-01-07 | Ion liquid-based microfluidic varifocus lens |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103994728A (en) * | 2013-02-19 | 2014-08-20 | 株式会社安川电机 | Object detector and robot system |
| CN106210466A (en) * | 2016-06-30 | 2016-12-07 | 联想(北京)有限公司 | Electronic equipment and photographic head thereof |
| CN108873123A (en) * | 2018-08-03 | 2018-11-23 | 北京航空航天大学 | A kind of compound long zooming liquid lens |
| CN109407350A (en) * | 2019-01-02 | 2019-03-01 | 京东方科技集团股份有限公司 | A kind of light modulation mould group and its working method, dimming glass and display device |
| CN110673240A (en) * | 2019-11-08 | 2020-01-10 | 厦门大学 | Electrofluid driven variable-focus liquid lens with S-shaped flow channel |
| CN113820767A (en) * | 2021-09-28 | 2021-12-21 | 渤远科学仪器(镇江)有限公司 | Electrowetting-driven zoom liquid lens with configurable initial focal length |
| CN114859443A (en) * | 2022-04-24 | 2022-08-05 | 武汉大学 | Liquid adjustable micro-lens array based on acoustics and microfluidic technology |
| EP4325258A1 (en) * | 2022-08-19 | 2024-02-21 | Optotune Switzerland AG | Liquids for tuneable optical devices |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103994728A (en) * | 2013-02-19 | 2014-08-20 | 株式会社安川电机 | Object detector and robot system |
| CN106210466A (en) * | 2016-06-30 | 2016-12-07 | 联想(北京)有限公司 | Electronic equipment and photographic head thereof |
| CN108873123A (en) * | 2018-08-03 | 2018-11-23 | 北京航空航天大学 | A kind of compound long zooming liquid lens |
| CN109407350A (en) * | 2019-01-02 | 2019-03-01 | 京东方科技集团股份有限公司 | A kind of light modulation mould group and its working method, dimming glass and display device |
| CN110673240A (en) * | 2019-11-08 | 2020-01-10 | 厦门大学 | Electrofluid driven variable-focus liquid lens with S-shaped flow channel |
| CN113820767A (en) * | 2021-09-28 | 2021-12-21 | 渤远科学仪器(镇江)有限公司 | Electrowetting-driven zoom liquid lens with configurable initial focal length |
| CN114859443A (en) * | 2022-04-24 | 2022-08-05 | 武汉大学 | Liquid adjustable micro-lens array based on acoustics and microfluidic technology |
| CN114859443B (en) * | 2022-04-24 | 2024-02-06 | 武汉大学 | Liquid adjustable micro-lens array based on acoustic and micro-fluidic technology |
| EP4325258A1 (en) * | 2022-08-19 | 2024-02-21 | Optotune Switzerland AG | Liquids for tuneable optical devices |
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Application publication date: 20110615 |