CN113759448A - Assembled liquid lens and preparation method thereof - Google Patents
Assembled liquid lens and preparation method thereof Download PDFInfo
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- CN113759448A CN113759448A CN202111143713.XA CN202111143713A CN113759448A CN 113759448 A CN113759448 A CN 113759448A CN 202111143713 A CN202111143713 A CN 202111143713A CN 113759448 A CN113759448 A CN 113759448A
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Images
Classifications
-
- 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
-
- 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
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Mechanical Light Control Or Optical Switches (AREA)
Abstract
The invention discloses an assembled liquid lens and a preparation method thereof, and relates to the technical field of photoelectric imaging, photoelectric sensing and optical information processing devices. Comprises a lens parent body inner core; a transparent lens cavity is axially arranged in the inner core of the lens parent body; a plurality of EWOD unit slots are formed in the wall surface of the lens cavity around the axis array of the lens cavity; EWOD units are assembled in the EWOD unit slots; transparent cover plates are arranged at two ends of the inner core of the lens parent body; the lens cavity sealed by the transparent cover plate is filled with mutually immiscible and transparent conductive liquid and insulating liquid with different refractive indexes; an electrowetting effect occurs through the EWOD cell, changing the shape of the interface of the conductive liquid and the insulating liquid to achieve optical zooming. The invention converts the core component of the traditional liquid zoom lens, namely the manufacture of the insulating dielectric layer providing the electrowetting effect, into the micro-rod spraying processing with mature production process, greatly simplifies the production process and improves the yield.
Description
Technical Field
The invention relates to the technical field of photoelectric imaging, photoelectric sensing and optical information processing devices, in particular to an assembled liquid lens and a preparation method thereof.
Background
The liquid zoom lens does not need mechanical movement, realizes zooming by changing the shape of liquid, has the advantages of compact structure, flexible control, low manufacturing cost, no mechanical abrasion, easy integration and the like, and is expected to end the development dispute of simulating optical large zooming by a plurality of cameras of a mobile phone lens.
Fluid zoom lenses based on dielectric Electrowetting (EWOD) use an applied voltage to adjust the curvature of the liquid surface and thereby change the focal length of the lens. The lens is small in structure and large in focal length adjusting range. The basic working principle of fluid zoom lenses based on dielectric Electrowetting (EWOD) released by Philips corporation is as follows: the lens material consists of two immiscible liquids with different refractive indices, one being a conductive aqueous solution (high refractive index) and the other being an electrically non-conductive oil (low refractive index), which are introduced into a short cylinder that is transparent on both the top and bottom. The side wall of the cylinder is subjected to insulating hydrophobic treatment, so that the interface of the two liquids can form a stable curved surface and play a role of a lens. When an electric field which is orthogonal to the hydrophobic processing surface is applied, the interfacial tension between the conductive aqueous solution and the side wall is reduced due to the electrowetting effect, so that the shape of the interface of the two liquids is changed, and finally the focal length of the lens is changed. The liquid lens structure of variaptic corporation is similar. However, the materials adopted by the zoom lens schemes are expensive, the device is complex, and the product yield is low.
Disclosure of Invention
The present invention is directed to a fabricated liquid lens and a method for fabricating the same, which solves the above problems.
To achieve the above object, the present invention provides a fabricated liquid lens and a method for manufacturing the same, comprising an inner core of a lens matrix; a transparent lens cavity is axially arranged in the inner core of the lens parent body; a plurality of EWOD unit slots are formed in the wall surface of the lens cavity around the axis array of the lens cavity; an EWOD unit is assembled in the EWOD unit slot; transparent cover plates are arranged at two ends of the inner core of the lens parent body; the lens cavity sealed by the transparent cover plate is filled with mutually immiscible and transparent conductive liquid and insulating liquid with different refractive indexes; an electrowetting effect occurs through the EWOD cell, changing the shape of the interface of the conductive liquid and the insulating liquid to achieve optical zooming.
Further, the EWOD unit is formed by wrapping an insulating layer outside the conductive micro-rod.
Furthermore, the insulating layer of the EWOD unit is coated with a hydrophobic layer.
Furthermore, the lens cavity is filled with a plurality of liquids.
Further, a transparent conducting layer is arranged on the transparent cover plate which is in contact with the conducting liquid and is taken as a first electrode to be led out; or other conductive materials are arranged between the conductive liquid and the sealing cover plate to be contacted with the conductive liquid and are led out as a shared first electrode; or when the lens parent inner core is made of a conductive material, the conductive liquid is directly contacted with the lens parent inner core and is led out as a shared first electrode.
Furthermore, the conductive micro-rod of the EWOD unit and the bottom surface of the insulating liquid in contact are mutually connected by a conductive material and are taken out as a second electrode.
Furthermore, a plurality of conductive micro-rods of the EWOD unit are woven into a plurality of groups, each group of conductive micro-rods are respectively and mutually connected in a conductive manner, the groups are electrically insulated from one another and form a plurality of electrode groups to be led out, and different control voltages are respectively applied to each group to control the shape of a liquid contact surface.
The invention also provides a preparation method of the assembled liquid lens, which is characterized by comprising the following steps:
s1, preparing an inner core of the lens parent body, preparing the inner core of the lens parent body by adopting a casting mould or a machining mode, and processing the inner part of the inner core of the lens parent body into a through hole-shaped structure; machining a plurality of EWOD unit slots in the side wall of the through hole, wherein the EWOD unit slots are arranged around the axis array of the through hole;
s2, preparing an EWOD unit, preparing a conductive micro-rod, wrapping an insulating layer outside the conductive micro-rod, and coating a thin hydrophobic layer outside the insulating layer;
s3, plugging the prepared EWOD unit into an EWOD unit slot, and fixing the EWOD unit slot by using viscose;
s4, removing the insulating layer at one end of each EWOD unit, which is in contact with the insulating liquid, exposing the conductive micro-rods, connecting all the conductive micro-rods by using a conductive material, and leading out the conductive micro-rods as second electrodes;
s5, gluing and sealing one end of the lens matrix inner core by using a transparent cover plate plated with a transparent conductive layer, and leading out the lens matrix inner core as a first electrode;
s6, injecting conductive liquid and insulating liquid into the lens cavity in sequence, and gluing and sealing the other end of the inner core of the lens parent body by using a transparent cover plate.
Further, when the transparent cover plate plated with the transparent conductive layer is used at both ends of the lens parent body inner core, in step S4, all the conductive micro-rods are connected with the conductive layer of the transparent cover plate near one end of the insulating liquid and are led out as the second electrode.
Further, in step S4, the conductive micro-rods of the EWOD cell are grouped together, the conductive micro-rods within a group are interconnected to be conductive, and the groups are electrically insulated from each other, and form an electrode group, and are led out through a separate conductive material.
The invention has the following effects:
1) the invention discloses an EWOD unit formed on the basis of conductive micro-rods, and then the EWOD unit is applied to the construction of liquid zoom lens products and provides electrowetting effect driving. The manufacture of the core component of the traditional liquid zoom lens, namely the insulating dielectric layer providing the electrowetting effect, is converted into the micro-rod spraying processing with mature production process, the production process is greatly simplified, and the yield is improved. The situation that the liquid zoom lens is monopolized by foreign technologies is broken at a stroke, and the localization of the liquid zoom lens is accelerated.
2) Because the variable liquid lens of the invention has the variable liquid lens 'zooming driving force from the electrowetting effect generated between the EWOD unit formed by the conductive micro-rod and the conductive liquid, and has nothing to do with the material and the shape of the lens parent inner core, the variable liquid lens can be assembled into the optical variable lens with any pupil shape by changing the shape of the lens parent inner core, such as a triangular pupil, a quadrangle or even a polygonal pupil, and breaks the limit of the variable lens's circular pupil; the adjustable optical devices with various special-shaped cavity structures can be designed and manufactured, and a new place can be brought to the design and the manufacture of the adjustable optical devices.
3) The simple and easy, colorful control electrode setting brings infinite possibility for the control and application of the adjustable optical device.
Drawings
FIG. 1 is a schematic view of a liquid lens assembly according to the present invention.
FIG. 2 is a schematic diagram of an EWOD unit of a fabricated liquid lens of the present invention.
Wherein, 1-lens parent body inner core; 2-EWOD unit slot; 3-a lens cavity; 4-EWOD unit; 5-conductive micro-rods; 6-an insulating layer; 7-hydrophobic layer.
Detailed Description
To achieve the above objects and advantages, the present invention provides a technical means and a structure thereof, which are described in detail with reference to the accompanying drawings.
The present invention is applicable to optical systems having an imaging function, for example, microscopes, telescopes, artificial biological eyes, and the like; the present invention may also be applied to apparatuses with an image capturing function, such as a mobile phone lens, a camera, a CCD lens, etc., and the present invention is not limited to the application scenario of the lens device, and the above description is only an example.
As shown in fig. 1-2, the invention provides a fabricated liquid lens, which comprises a through hole-shaped lens parent body inner core 1, a plurality of EWOD units 4 which are inserted and assembled with EWOD unit slots 2 on the inner wall of the through hole-shaped lens parent body inner core, and an upper cover plate and a lower cover plate which are used for packaging transparent liquid; the EWOD unit 4 is formed by wrapping an insulating layer 6 outside a conductive micro-rod 5, and if necessary, a hydrophobic layer 7 can be coated outside the conductive micro-rod; all the EWOD units 4 are combined into a dielectric electrowetting wire wall capable of generating dielectric wetting action; the inside of the through hole sealed by the transparent upper cover plate and the transparent lower cover plate is used as a lens cavity 3, two or more conductive liquids and insulating liquids are stored in the through hole and used as lens materials, the lens cavity has the characteristics of different refractive indexes and mutual insolubility, contact curved surfaces of the conductive liquids and the insulating liquids play the role of a lens, the conductive liquids and the EWOD unit 4 are respectively connected with a first electrode and a second electrode, voltage is applied between the first electrode and the second electrode, and the conductive liquids and a dielectric electrowetting line wall generate an electrowetting effect to reduce the surface tension of the liquid, so that the shape of a liquid bending interface is changed, and optical zooming is realized.
The zooming driving force of the variable liquid lens is from the electrowetting effect generated between the EWOD unit 4 and the conductive liquid and is independent of the lens parent inner core 1, so the lens parent inner core 1 can be made of an electric conductor or a non-electric conductor; the shape is not limited, and the shape of the lens is preferably a through hole circular tube shape or a double cone shape; when the adjustable optical component is used as other adjustable optical components, other arbitrary shapes can be selected.
The electrodes are divided into a common first electrode and a second electrode for control.
The common electrode arrangement is described below in three cases.
In the first scheme, at least one of the upper cover plate and the lower cover plate is provided with a transparent conducting layer on the surface, and the surface of the transparent conducting layer contacted with the conducting liquid is fully contacted and is led out as a shared first electrode.
And in the second scheme, in order to reduce the reflection loss of the upper cover plate and the lower cover plate to the light as much as possible, the surfaces of the upper cover plate and the lower cover plate are not provided with transparent conducting layers, and at the moment, other conducting materials can be arranged between the conducting liquid and the sealing cover plate to be contacted with the conducting liquid and be led out as a shared first electrode.
And in the third scheme, when the lens parent body inner core 1 is made of a conductive material, the conductive liquid is directly contacted with the lens parent body inner core and is led out as a shared first electrode.
The second electrode arrangement for control can be enriched in various kinds, for example, the following two cases.
In the first scheme, the conductive micro-rod 5 of the EWOD unit 4 is connected with the bottom surface of the insulating liquid in contact with the insulating liquid by a lead or other conductive materials, and the whole is led out as a second electrode.
In the second scheme, the EWOD cell 4 is divided into n independent cells, the cells are connected by using n conducting wires, control electrodes which can be named as a second electrode _1, a second electrode _2 and a second electrode _ n … are formed, different control voltages are applied to the electrodes, and each cell array can independently generate electrowetting. In this case, the same control voltage is applied to each control electrode, so that the curved interface of the liquid lens is a spherical surface, and the zooming control effect is the same as that of the first solution; when different control voltages are applied to the control electrodes, the bending interface of the liquid lens can deflect, the optical axis of the lens can deflect at a certain angle, and when the lens system shakes, the focus position can be changed by adaptively adjusting the control voltages, so that the phenomenon of poor quality of an imaging image brought by shaking can be improved. In addition, the liquid contact surface can be used as an expansion, for example, the liquid contact surface can be used as a cascade, and the liquid contact surface can be reformed into an aspheric surface application.
The liquid stored in the lens cavity 3 can be three or more liquids.
Specific example 1: the lens parent body inner core 1 can adopt a metal cylinder or a conical cylinder for rust prevention treatment, an EWOD unit slot 2 is arranged on the inner wall through a lathing process or a metal casting mold technology, and the typical value of the inner diameter of the cylinder can be 0.1mm-100 mm. The conductive micro-rod 5 of the EWOD unit 4 is preferably formed by processing a metal thin conductive wire, such as a copper wire, a silver wire, a gold wire, an aluminum wire, an iron wire, or tantalum, niobium, or the like, or a non-metal conductive material such as conductive silicone rubber or the like; the wire cores with different core diameters can be selected according to the different inner diameter sizes of the circular (conical) cylinder, and the wire cores are different from micrometer magnitude to millimeter magnitude; the periphery of the wire core is coated with micron-sized parylene as an insulating layer 6 by vapor deposition or coating, the typical value can be 1-10 microns, and the commonly used insulating dielectric materials of a capacitor, such as high dielectric coefficient materials of tantalum oxide (niobium), aluminum oxide and the like, can be selected to reduce the driving voltage; the hydrophobic layer 7 mainly plays a role in hydrophobic modification, so that the hydrophobic layer is realized by adopting a polytetrafluoroethylene polymer material coating below a micron level or even a nanometer level, a surface microstructure can be manufactured on the outer side of the insulating layer 6 to improve the hydrophobicity, and the hydrophobic layer 7 can be additionally coated after the assembly of the EWOD unit 4 is finished. According to different requirements, the shape of the end face of the wire core can be diversified, and the end face of the wire core is circular, elliptical, round-angle rectangular and the like.
The EWOD unit 4 is assembled and inserted into an EWOD unit slot, the formed dielectric electrowetting linear walls are arranged in a longitudinal mode, dielectric electrowetting linear walls which are distributed in the same way as the inner walls of the through holes of the circular (conical) cylinder are formed on the wall of the through hole cavity, and viscose glue or ultraviolet curing glue can be pre-coated between the linear walls and the inner walls of the through hole cavity for fixing. The arrangement of the wire walls can be diversified, for example, a plurality of layers of wire walls can be arranged, each layer is controlled by different electrodes, each layer of wire walls can be longitudinally divided into n parts and controlled by different electrodes, wires of the wire walls can be arranged in a matching way, for example, a layer of wire walls is arranged by thick wires, and then thin wires are arranged among the thick wires for filling, so that the filling ratio and the surface flatness are increased; or one or more layers of wire walls are arranged by the thin wire core, and then one or more layers of thick wires are sparsely arranged on the liquid contact side of the wire walls by the thick wires so as to improve the contact area between the liquid and the wire walls.
The transparent upper cover plate and the transparent lower cover plate are high-performance thin glass sheets (such as special cover glass for biochemical experiments of model WEST Chester and PA19380, which are produced by VWR Scientific company), and the glass sheets have good toughness and high light transmittance; the conducting layer of the transparent cover plate can be realized by adopting an ITO layer prepared by a vacuum coating method. Bromododecane (density 1.0399, refractive index 1.4583) was used as the insulating liquid, and a saline solution was used as the conductive liquid, which was configured to have the same density as the insulating liquid, to remove the influence of gravity.
Specific example 2: whether the EWOD unit slot 2 is conductive or not is not a core element, a non-metal cylinder or a conical cylinder made of silicon rubber or plastic and the like can be adopted, and the silicon rubber and the like are easy to form and can realize large-scale production by a mould injection molding processing method; if the parent body is required to be conductive, a conductive medium can be added into the material to be made into conductive silicon rubber or plastic. The dielectric electrowetting wire can be manufactured by referring to a manufacturing method of a polyester imide/polyamide imide composite layer enameled wire, but the thickness of an insulating layer is controlled within 10 micrometers so as to reduce the electrowetting effect control voltage. After the dielectric electrowetting line wall is mounted in place on the lens matrix 1, the hydrophobic layer is additionally dipped in hydrophobic agent FOTs on the surface of the line wall so as to improve the initial contact angle of liquid. The conductive liquid adopts lithium chloride aqueous solution or sodium sulfate aqueous solution respectively, and the insulating liquid adopts benzyl siloxane.
Specific example 3: because the zooming driving force of the variable liquid lens is from the electrowetting effect generated between the EWOD unit 4 and the conductive liquid, and is irrelevant to the material and the shape of the inner core 1 of the lens parent body, the variable liquid lens can construct a light variable lens with any pupil shape, such as a triangular pupil, a quadrilateral pupil and even a polygonal pupil, thereby breaking through the limitation of the circular pupil of the variable liquid lens; the adjustable optical devices with various special-shaped cavity structures can be designed and prepared, and the design and preparation of the adjustable optical devices are brought into a new place by combining the simple, feasible and colorful control electrode design, and other optical adjustable devices are formed by the structure. The upper and lower cover sheets are made of chemically strengthened optical glass or other similar materials used for manufacturing mobile phone screens, such as sodium silicate glass materials, Corning gorilla glass, or organic glass used for manufacturing OLED.
The invention also provides a preparation method of the assembled liquid lens, which comprises the following steps:
s1, preparing a lens parent body inner core 1, preparing the lens parent body inner core 1 by adopting a casting mould or machining mode, and processing the inside of the lens parent body inner core 1 into a through hole-shaped structure; machining a plurality of EWOD unit slots 2 on the side wall of the through hole, wherein the EWOD unit slots 2 are arranged around the axis array of the through hole;
s2, preparing an EWOD unit 4, preparing a conductive micro-rod 5, wrapping an insulating layer 6 outside the conductive micro-rod 5, and coating a thin hydrophobic layer 7 outside the insulating layer 6;
s3, the prepared EWOD unit 4 is filled in the EWOD unit slot 2 and can be fixed by a little viscose glue;
s4, removing the insulating layer 6 at one end, which is contacted with insulating liquid, of each EWOD unit 4 to expose the conductive micro-rods, and connecting all the conductive micro-rods 5 by using a conductive material and leading out as second electrodes;
s5, gluing and sealing one end of the lens parent body inner core 1 by using a transparent cover plate plated with a transparent conductive layer, and leading out the transparent cover plate serving as a first electrode;
s6, injecting conductive liquid and insulating liquid into the lens cavity in sequence, and gluing and sealing the other end of the lens parent body inner core 1 by using a transparent cover plate.
In another embodiment, when the transparent cover plate plated with the transparent conductive layer is used at both ends of the lens mother core 1, all the conductive micro-rods 5 are connected to the conductive layer of the transparent cover plate near one end of the insulating liquid and led out as the second electrode in step S4.
In another embodiment, in step S4, the conductive micro-rods 5 of the EWOD cell are grouped together, the conductive micro-rods 5 within a group are interconnected to be conductive, electrically isolated from one another, and form an electrode group, which is drawn through separate conductive materials.
In another embodiment, when the side walls of the EWOD unit slots 2 are all provided with metal electrode pin pins, the metal pins can be externally connected into an integral electrode to be led out, or can be grouped to form an electrode group to be led out, and each metal pin can also be led out as an independent electrode, so that each EWOD unit 4 can be accurately controlled to work independently in an addressing mode, and the purpose of finely controlling the surface shape of the liquid is achieved.
The above description is only a preferred embodiment of the present invention, and not all embodiments, and all structural changes made under the teaching of the present invention should be understood as belonging to the protection scope of the present invention.
Claims (10)
1. An assembled liquid lens comprising a lens precursor core; a transparent lens cavity is axially arranged in the inner core of the lens parent body; a plurality of EWOD unit slots are formed in the wall surface of the lens cavity around the axis array of the lens cavity; an EWOD unit is assembled in the EWOD unit slot; transparent cover plates are arranged at two ends of the inner core of the lens parent body; the lens cavity sealed by the transparent cover plate is filled with mutually immiscible and transparent conductive liquid and insulating liquid with different refractive indexes; an electrowetting effect occurs through the EWOD cell, changing the shape of the interface of the conductive liquid and the insulating liquid to achieve optical zooming.
2. A fabricated liquid lens of claim 1, wherein said EWOD unit is formed of a conductive micro-rod surrounded by an insulating layer.
3. A fabricated liquid lens as in claim 2 wherein the EWOD unit has a hydrophobic coating applied over the insulating layer.
4. A fabricated liquid lens according to claim 1, wherein said lens cavity is filled with a plurality of liquids.
5. A fabricated liquid lens according to claim 1, wherein a transparent conductive layer is provided on the transparent cover sheet which is in contact with the conductive liquid, and is led out as the first electrode; or other conductive materials are arranged between the conductive liquid and the sealing cover plate to be contacted with the conductive liquid and are led out as a shared first electrode; or when the lens parent inner core is made of a conductive material, the conductive liquid is directly contacted with the lens parent inner core and is led out as a shared first electrode.
6. A fabricated liquid lens according to claim 5, wherein the conductive micro-rods of the EWOD unit are connected to each other with a conductive material on the bottom surface thereof in contact with the insulating liquid and led out as the second electrode.
7. A fabricated liquid lens as claimed in claim 5, wherein a plurality of said EWOD unit conductive micro-rods are organized into a plurality of groups, each group of conductive micro-rods being conductively connected to each other, electrically isolated from each other, and forming a plurality of electrode group leads, each group being applied with a different control voltage to control the liquid contact surface morphology.
8. A method for preparing a fabricated liquid lens is characterized by comprising the following steps:
s1, preparing an inner core of the lens parent body, preparing the inner core of the lens parent body by adopting a casting mould or a machining mode, and processing the inner part of the inner core of the lens parent body into a through hole-shaped structure; machining a plurality of EWOD unit slots in the side wall of the through hole, wherein the EWOD unit slots are arranged around the axis array of the through hole;
s2, preparing an EWOD unit, preparing a conductive micro-rod, wrapping an insulating layer outside the conductive micro-rod, and coating a thin hydrophobic layer outside the insulating layer;
s3, plugging the prepared EWOD unit into an EWOD unit slot, and fixing the EWOD unit slot by using viscose;
s4, removing the insulating layer at one end of each EWOD unit, which is in contact with the insulating liquid, exposing the conductive micro-rods, connecting all the conductive micro-rods by using a conductive material, and leading out the conductive micro-rods as second electrodes;
s5, gluing and sealing one end of the lens matrix inner core by using a transparent cover plate plated with a transparent conductive layer, and leading out the lens matrix inner core as a first electrode;
s6, injecting conductive liquid and insulating liquid into the lens cavity in sequence, and gluing and sealing the other end of the inner core of the lens parent body by using a transparent cover plate.
9. The method of claim 8, wherein when transparent cover plates coated with transparent conductive layers are used at both ends of the core of the lens precursor, all the conductive micro rods are connected to the conductive layer of the transparent cover plate near one end of the insulating liquid and led out as the second electrode in step S4.
10. The method of claim 8, wherein in step S4, the conductive micro-rods of the EWOD unit are connected in groups, the conductive micro-rods within a group are electrically interconnected, and the groups are electrically isolated from each other and form an electrode group, and are led out through a separate conductive material.
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| CN111830611A (en) * | 2019-04-22 | 2020-10-27 | 陈浩南 | Line wall type multi-electrode control electrowetting driving liquid lens |
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| CN1841095A (en) * | 2005-04-01 | 2006-10-04 | 索尼株式会社 | Variable focus lens and optical device using the same as well as method of manufacturing variable focus lens |
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| CN101458346A (en) * | 2007-12-11 | 2009-06-17 | 鸿富锦精密工业（深圳）有限公司 | Liquid lens |
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Application publication date: 20211207 |