CN112363258B - Variable-focus liquid lens device modulated by triboelectric effect - Google Patents
Variable-focus liquid lens device modulated by triboelectric effect Download PDFInfo
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- CN112363258B CN112363258B CN202010055226.7A CN202010055226A CN112363258B CN 112363258 B CN112363258 B CN 112363258B CN 202010055226 A CN202010055226 A CN 202010055226A CN 112363258 B CN112363258 B CN 112363258B
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- 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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- 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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N1/00—Electrostatic generators or motors using a solid moving electrostatic charge carrier
- H02N1/04—Friction generators
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Mechanical Light Control Or Optical Switches (AREA)
- Electrochromic Elements, Electrophoresis, Or Variable Reflection Or Absorption Elements (AREA)
Abstract
The invention discloses a variable-focus liquid lens device modulated by a triboelectric effect. The varifocal liquid lens device modulated by the triboelectric effect comprises a pressure source part and a lens part, wherein the pressure source part is used for supplying power to the lens part, the pressure source part comprises more than two first friction pieces arranged at intervals along a first direction and a second friction piece arranged on the first friction pieces, and the second friction piece can move in the first direction and generate friction charges by rubbing with the first friction pieces; the lens part comprises a transparent shell with an accommodating space inside, liquid capable of being used as a lens is filled in the accommodating space, more than two transparent electrodes are arranged on the side face of the accommodating space and electrically connected with more than two first friction pieces correspondingly, and when the second friction piece moves in the first direction, the liquid in the accommodating space can change shape under the action of the more than two electrodes. The varifocal liquid lens device modulated by the triboelectric effect has low power consumption and high safety.
Description
Technical Field
The invention relates to the technical field of liquid lenses, in particular to a varifocal liquid lens device modulated by a triboelectric effect.
Background
In recent years, liquid lenses have attracted much attention in a wide variety of important fields due to their advantages such as small size and wide zooming range. Among them, the liquid lens modulated electrically has drawn much attention from researchers because of its advantages such as simple structure, no need of mechanical auxiliary systems such as gear transmission, etc.
Electrically modulated liquid lenses, as typical devices for voltage regulation, require modulation voltages typically as high as several hundred volts, and even up to thousands of volts. Currently, commercial high voltage sources are constant voltage sources, which continuously replenish charge when a load has a leakage charge. Therefore, electrically modulated liquid lenses face the problem of large power consumption, and large leakage currents also present a challenge in terms of safety, especially for small-sized wearable devices.
Disclosure of Invention
The embodiment of the invention provides a varifocal liquid lens device modulated by a triboelectric effect, which aims to solve the problem of high power consumption of an electrically modulated liquid lens.
The embodiment of the invention provides a varifocal liquid lens device modulated by a triboelectric effect, which comprises a pressure source part and a lens part, wherein the pressure source part is used for supplying power to the lens part, the pressure source part comprises more than two first friction pieces arranged at intervals along a first direction, and a second friction piece arranged on the first friction pieces, and the second friction piece can move in the first direction and generate friction charges by rubbing with the first friction pieces; the lens part comprises a transparent shell with an accommodating space inside, liquid capable of being used as a lens is filled in the accommodating space, more than two transparent electrodes are arranged on the side face of the accommodating space and electrically connected with more than two first friction pieces correspondingly, and when the second friction piece moves in the first direction, the liquid in the accommodating space can change shape under the action of the more than two electrodes.
According to one aspect of the embodiment of the present invention, the two or more electrodes include a first electrode and a second electrode, the first electrode and the second electrode are disposed opposite to each other, and the first electrode and the second electrode have the same length and different widths.
According to an aspect of the embodiment of the present invention, the first electrode is disposed in parallel with the second electrode.
According to an aspect of the embodiment of the present invention, the two or more electrodes include a first electrode and a second electrode, the first electrode has a ring structure, and the second electrode is disposed within a surrounding area of the first electrode.
According to an aspect of the embodiment of the present invention, the axial direction of the first electrode is arranged in a direction in which the light beam enters the lens section.
According to an aspect of the embodiment of the present invention, the extending direction of the second electrode is perpendicular to the axial direction of the first electrode, and the top surface of the second electrode is flush with the bottom surface of the first electrode.
According to an aspect of the embodiment of the present invention, the receiving space has a shape of a rectangular parallelepiped, a square, or a cylinder, and the two or more electrodes are disposed on a side surface of the receiving space.
According to an aspect of an embodiment of the present invention, in the first direction, a distance between adjacent first friction members is smaller than a length of the second friction member.
According to an aspect of the embodiment of the present invention, the pressure source portion further includes a base plate, and the base plate, the first friction member, and the second friction member are sequentially stacked.
According to an aspect of the embodiment of the present invention, the material of the first friction member is a material having an electropositive property, and the material of the second friction member is a material having an electronegative property.
According to an aspect of the embodiment of the present invention, the first friction member includes a first friction material layer and a first friction electrode layer which are stacked, the first friction material layer is disposed facing the second friction member, and the first friction electrode layer is electrically connected with the electrode of the lens portion; the materials of the surfaces of the first friction material layer and the second friction member which are in contact friction with each other have different electronegativities.
The variable-focus liquid lens device modulated by the triboelectric effect provided by the embodiment of the invention has the advantages that the pressure source part and the lens part are matched to act, the lens part is modulated by the triboelectric effect of the pressure source part, the second friction member moves relative to the first friction member under the action of external force to generate frictional charges, the frictional charges transferred by more than two electrodes of the lens part form a non-uniform electric field, the gas-liquid interface of the liquid filled in the accommodating space is acted by the dielectrophoretic force, the form of the liquid is changed, the focal length of the lens part is modulated, electricity can be generated by the pressure source part, a sufficiently large modulation voltage can be provided for the lens part, the focal length of the liquid lens can be modulated without an external power supply, a booster circuit and the like, the device has small overall power consumption, high safety, high modulation efficiency, large adjustable range and simple structure, is easy for industrialized production.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a variable focus liquid lens device modulated by the triboelectric effect according to an embodiment of the present invention, in which a lens portion is a side view.
Fig. 2a is a schematic structural diagram of a variable focus liquid lens device modulated by the triboelectric effect according to an embodiment of the present invention in a certain state, wherein the lens portion is a top view.
Fig. 2b is a schematic structural diagram of a variable focus liquid lens device modulated by the triboelectric effect according to an embodiment of the present invention in another state, wherein the lens portion is a top view.
Fig. 2c is a schematic structural diagram of a variable focus liquid lens device modulated by the triboelectric effect according to an embodiment of the present invention in another state, wherein the lens portion is a top view.
Fig. 3 is a schematic diagram illustrating a corresponding relationship between a moving distance and a focal length of a variable focus liquid lens device modulated by a triboelectric effect according to an embodiment of the present invention.
Fig. 4 is a schematic structural diagram of a variable focus liquid lens device modulated by the triboelectric effect according to another embodiment of the present invention, wherein the lens portion is a side view.
In the drawings:
100-a pressure source portion, 200-a lens portion;
101-a first friction member, 102-a second friction member, 103-a base plate;
201-first electrode, 202-second electrode, 203-housing.
Detailed Description
The embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following detailed description of the embodiments and the accompanying drawings are provided to illustrate the principles of the invention, but are not intended to limit the scope of the invention, i.e., the invention is not limited to the described embodiments.
In the description of the present invention, it is to be noted that, unless otherwise specified, the terms "first" and "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; "plurality" means two or more; the terms "inner", "outer", "top", "bottom", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
Referring to fig. 1, a variable focal length liquid lens apparatus modulated by a triboelectric effect according to an embodiment of the present invention includes a voltage source unit 100 and a lens unit 200, wherein the voltage source unit 100 is configured to supply power to the lens unit 200, the voltage source unit 100 includes two or more first friction members 101 disposed at intervals along a first direction, and a second friction member 102 disposed on the first friction members 101, and the second friction member 102 is capable of moving in the first direction and generating triboelectric charges by friction with the first friction members 101; the lens portion 200 includes a transparent housing 203 having an accommodating space therein, the accommodating space is filled with a liquid that can be used as a lens, two or more transparent electrodes are disposed on a side surface of the accommodating space, the two or more transparent electrodes are electrically connected to the two or more first friction members 101, and the liquid in the accommodating space can change its form under the action of the two or more transparent electrodes when the second friction member 102 moves in the first direction. In the present embodiment, the pressure source unit 100 cooperates with the lens unit 200 to modulate the lens unit 200 by the triboelectric effect of the pressure source unit 100, the second friction member 102 moves relative to the first friction member 101 under the action of an external force to generate frictional charges, the frictional charges transferred by the two or more electrodes of the lens unit 200 form an inhomogeneous electric field, the gas-liquid interface of the liquid filled in the accommodating space is acted by the dielectrophoretic force, the form of the liquid is changed to modulate the focal length of the lens unit 200, the power generation can be performed by the pressure source unit 100, a sufficiently large modulation voltage can be provided for the lens unit 200, the modulation of the focal length of the liquid lens can be performed without an external power supply or a booster circuit, the entire power consumption of the device is small, the safety is high, the modulation efficiency is high, the adjustable range is large, the structure is simple, the industrial production is easy, and the artificial optical system, the piezoelectric effect of the liquid lens is widened, Portable electronic devices and human-computer interaction.
In the variable-focus liquid lens apparatus modulated by the triboelectric effect according to the present embodiment, the pressure source unit 100 serves as an intermediate medium, and the human-computer interaction relationship between the sliding motion and the zooming is realized by associating the sliding motion with the change in the focal length of the lens.
The shell 203 of the lens part 200 is made of colorless transparent acrylic material; the electrodes of the lens part 200 are made of thin film Indium Tin Oxide (ITO) plated on the side surfaces of the accommodating space, and the indium tin oxide is transparent when being thin; the liquid filled in the containing space adopts polyphenyl methyl siloxane.
In this embodiment, when the number of the first friction members 101 is more than two, all the first friction members 101 are divided into two groups, for example, the first friction member 101 along the first direction is the first group, the rest of the first friction members 101 are the second group, the second group of the first friction members 101 are electrically connected, correspondingly, the electrodes are also divided into two groups, the first group of the electrodes includes one electrode, the second group of the electrodes includes one electrode or a plurality of electrodes electrically connected with each other, the first group of the electrodes is electrically connected with the first group of the first friction members 101, and the second group of the electrodes is electrically connected with the second group of the first friction members 101; the second friction member 102 moves in the first direction, and sequentially frictionally charges the plurality of first friction members 101, and the electrodes receive frictional charges.
As an alternative embodiment, the two or more electrodes include a first electrode 201 and a second electrode 202, the first electrode 201 and the second electrode 202 are disposed opposite to each other, and the first electrode 201 and the second electrode 202 have the same length and different widths.
In the present embodiment, the first electrode 201 and the second electrode 202 have the same length and different widths, and form a set of asymmetric electrodes, the frictional charges transferred by the set of asymmetric electrodes form an inhomogeneous electric field, and can apply a dielectrophoretic force to the liquid filled in the accommodating space, and the gas-liquid interface of the liquid can be continuously changed from a biconcave shape to a biconvex shape by the action of the dielectrophoretic force, so that the lens portion 200 is changed from a concave lens to a convex lens, thereby realizing the modulation of the focal length of the liquid lens.
In this embodiment, when the number of the electrodes is more than two, all the electrodes are divided into two groups, the first electrode 201 is the first group, and the second electrode 202 is the second group; if the number of the first electrodes 201 is plural, the plural first electrodes 201 are tiled and electrically connected to each other, and if the number of the second electrodes 202 is plural, the plural second electrodes 202 are tiled and electrically connected to each other.
As an alternative embodiment, the first electrode 201 is arranged in parallel with the second electrode 202.
The first electrode 201 and the second electrode 202 are arranged in parallel in this embodiment, so that the biconvex shape of the liquid filled in the accommodating space can be more regular, and the focal length of the liquid lens can be modulated more accurately and efficiently.
The following describes the zoom principle of the variable focus liquid lens apparatus modulated by the triboelectric effect according to the present embodiment:
as shown in fig. 2a, 2b, and 2c, in the initial state, the liquid filled in the accommodating space is shaped like a double concave under the action of its surface tension, the amount of the frictional charges transferred to the first electrode 201 and the second electrode 202 increases as the second friction member 102 moves relative to the first friction member 101, the non-uniform electric field formed between the first electrode 201 and the second electrode 202 is gradually increased, the gas-liquid interface of the liquid is acted by the dielectrophoretic force, the liquid is pulled from the region with weak electric field to the region with strong electric field, the shape of the liquid is continuously modulated from the double concave shape to the double convex shape, the change of the liquid shape represents the change of the focal length, and the modulation of the focal length of the liquid lens is realized.
Regarding the correspondence relationship between the moving distance of the second friction member 102 and the focal length of the lens portion 200, as shown in fig. 3, in the moving range of 0 to 90mm, the shape of the liquid filled in the accommodation space is modulated from the biconcave shape to the biconvex shape, the focal length of the lens portion 200 is modulated from-6 mm to 41mm, and as the moving distance further increases, in the moving range of 90mm to 180mm, the shape of the liquid is modulated from the biconvex shape, and the focal length of the lens portion 200 is modulated from 37mm to 6 mm; in the whole modulation process, the moving distance of the second friction piece 102 and the focal length of the lens part 200 are in one-to-one correspondence, so that continuous zooming is realized; taking the modulation of the parallel light beams as an example, the divergent modulation or the convergent modulation of the parallel light beams can be realized.
Referring to fig. 4, as an alternative embodiment, the two or more electrodes include a first electrode 201 and a second electrode 202, the first electrode 201 is a ring structure, and the second electrode 202 is disposed in a surrounding area of the first electrode 201.
As an alternative embodiment, the axial direction of the first electrode 201 is arranged in the direction in which the light beam enters the lens portion 200.
As an alternative embodiment, the extending direction of the second electrode 202 is perpendicular to the axial direction of the first electrode 201, and the top surface of the second electrode 202 is flush with the bottom surface of the first electrode 201.
In this embodiment, when the number of the electrodes is more than two, all the electrodes are divided into two groups, the first electrode 201 is the first group, and the second electrode 202 is the second group; if the number of the first electrodes 201 is plural, the plural first electrodes 201 are coaxially disposed and electrically connected to each other, and if the number of the second electrodes 202 is plural, the plural second electrodes 202 are tiled and electrically connected to each other.
In the present embodiment, the second electrode 202 is disposed in the surrounding range of the first electrode 201, the second electrode 202 is located on the top surface or the bottom surface of the accommodating space, and the liquid in the accommodating space is disposed in the surrounding range of the annular first electrode 201, so that the form of the liquid is changed from the circumferential direction and the axial direction of the first electrode 201.
The first electrode 201 and the second electrode 202 of the present embodiment cooperate to change the form of the liquid in the accommodating space into a single concave, thereby realizing the modulation of the focal length of the liquid lens, forming a double lens, and realizing the zooming-in or zooming-out function.
As an alternative embodiment, the shape of the accommodating space is a cuboid, a cube or a cylinder, and more than two electrodes are arranged on the side surface of the accommodating space.
In this embodiment, when the shape of the accommodating space is a rectangular parallelepiped or a square, two or more electrodes may be disposed on the bottom surface and the top surface of the accommodating space, or the bottom surface and the side surface perpendicular to the bottom surface; when the accommodating space is cylindrical, two or more electrodes may be disposed on the bottom and top surfaces, or the bottom and cylindrical surfaces, of the accommodating space.
As an alternative embodiment, the spacing between adjacent first friction members 101 in the first direction is less than the length of the second friction member 102.
In this embodiment, when the second friction member 102 moves from one first friction member 101 to another adjacent first friction member 101, there is a process that the second friction member 102 simultaneously rubs against the two adjacent first friction members 101, so that the generation of the frictional charge is continuous, and further the form of the liquid in the accommodating space is continuously changed, and the controllability of zooming is better.
As an alternative embodiment, the pressure source portion 100 further includes a base plate 103, and the base plate 103, the first friction member 101, and the second friction member 102 are sequentially stacked.
In the present embodiment, the base plate 103 is used as a supporting base, the first friction member 101 is disposed on the upper surface of the base plate 103 as a friction pair, the second friction member 102 is used as another friction pair, and the lower surface of the second friction member 102 rubs against the upper surface of the first friction member 101 to convert mechanical energy into electrical energy.
Furthermore, the base plate 103, the first friction member 101 and the second friction member 102 may all be of a layered structure, the first friction member 101 may be attached to the upper surface of the base plate 103, and the top of the base plate 103 may be provided with a groove-like structure capable of defining the moving direction of the second friction member 102.
In this embodiment, the base plate 103 may be made of a colorless transparent acrylic material; the pressure source portion 100 may be provided structurally independently of the lens portion 200.
The voltage source unit 100 of the present embodiment can be used as a constant current source for outputting high voltage and low current, and the voltage can satisfy the modulation for the lens unit 200, and the safety is ensured, and the present embodiment is efficient and highly controllable.
According to an aspect of the embodiment of the present invention, the material of the first friction member 101 is a material having an electropositive property, and the material of the second friction member 102 is a material having an electronegative property.
In this embodiment, the material of the first friction member 101 may be a material having an electropositive property such as copper and aluminum, and the material of the second friction member 102 may be a material having a strong electronegative property such as fluorinated ethylene propylene copolymer (FEP) and Polytetrafluoroethylene (PTFE); the second friction member 102 accumulates negative frictional charge on the surface due to the difference in electronegativity of the materials, and the first friction member 101 accumulates positive frictional charge on the surface according to the charge conservation law.
According to an aspect of the embodiment of the present invention, the first friction member 101 includes a first friction material layer and a first friction electrode layer which are stacked, the first friction material layer is disposed facing the second friction member 102, and the first friction electrode layer is electrically connected to the electrode of the lens portion 200; the materials of the surfaces of the first friction material layer and the second friction member 102 that contact and rub each other have different electronegativities.
In this embodiment, the first friction member 101 is formed by sequentially laminating a first friction material layer facing the second friction member 102 and a first friction electrode layer connected to the electrode of the lens part 200; the materials of the surfaces of the first friction material layer and the second friction member 102, which contact and rub with each other, have different electronegativities, and are separated after contacting with each other, so that different charges can be generated on the respective surfaces.
It should be understood by those skilled in the art that the foregoing is only illustrative of the present invention, and the scope of the present invention is not limited thereto. It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (11)
1. A variable-focus liquid lens device modulated by the triboelectric effect, comprising a pressure source section for supplying power to a lens section and a lens section,
a voltage source unit including two or more first friction members disposed at intervals in a first direction, and a second friction member disposed on the first friction member, the second friction member being movable in the first direction and generating a frictional charge by rubbing against the first friction member;
the lens part comprises a transparent shell with an accommodating space inside, liquid which can be used as a lens is filled in the accommodating space, more than two transparent electrodes are arranged on the side surface of the accommodating space, the more than two electrodes are correspondingly and electrically connected with the more than two first friction pieces, and the liquid in the accommodating space can change the shape under the action of the more than two electrodes when the second friction piece moves in the first direction.
2. The variable focus liquid lens arrangement according to claim 1 having a modulation by the triboelectric effect, wherein said two or more electrodes comprise a first electrode and a second electrode, said first electrode and said second electrode being disposed opposite to each other, and said first electrode and said second electrode having the same length and different widths.
3. The variable focus liquid lens arrangement with modulation of the triboelectric effect according to claim 2, characterized in that the first electrode is arranged in parallel with the second electrode.
4. The variable focus liquid lens arrangement according to claim 1 having a modulation by the triboelectric effect, wherein said two or more electrodes comprise a first electrode and a second electrode, said first electrode having an annular structure, said second electrode being disposed within a surrounding area of said first electrode.
5. The variable focus liquid lens arrangement with modulation of the triboelectric effect according to claim 4, wherein the axial direction of the first electrode is arranged in the direction of the light beam entering the lens portion.
6. The variable focus liquid lens arrangement according to claim 4 with modulation of the triboelectric effect, wherein the direction of extension of the second electrode is perpendicular to the axial direction of the first electrode and the top surface of the second electrode is flush with the bottom surface of the first electrode.
7. The variable focal length liquid lens device with modulation by the triboelectric effect according to claim 1, wherein the accommodating space has a shape of a rectangular parallelepiped, a square, or a cylinder, and the two or more electrodes are provided on side surfaces of the accommodating space.
8. A variable focus liquid lens arrangement with modulation of the triboelectric effect according to claim 1, characterized in that the spacing of adjacent first rubbing pieces in a first direction is smaller than the length of the second rubbing piece.
9. The variable focal length liquid lens device with modulation by the triboelectric effect according to claim 1, wherein the pressure source section further comprises a base plate, and the base plate, the first friction member, and the second friction member are arranged in a stacked manner in this order.
10. A variable focus liquid lens arrangement with modulation of the triboelectric effect according to any of claims 1 to 9, characterized in that the material of the first friction member is a material with an electropositivity and the material of the second friction member is a material with an electronegativity.
11. The variable focus liquid lens device with modulation of the triboelectric effect according to any of claims 1 to 9, wherein the first friction member comprises a first friction material layer and a first friction electrode layer which are arranged in a stacked manner, the first friction material layer is arranged facing the second friction member, and the first friction electrode layer is electrically connected to the electrode of the lens portion;
the materials of the surfaces of the first friction material layer and the second friction member which contact and rub with each other have different electronegativities.
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| CN104102000A (en) * | 2013-04-10 | 2014-10-15 | 齐发光电股份有限公司 | Method for driving liquid lens |
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| JP2006285031A (en) * | 2005-04-01 | 2006-10-19 | Sony Corp | Variable focus lens, optical apparatus using the same, manufacturing method of variable focus lens |
| CN109254398A (en) * | 2018-11-02 | 2019-01-22 | 上海酷聚科技有限公司 | A kind of zooming liquid lens |
| CN109613693A (en) * | 2018-11-02 | 2019-04-12 | 上海酷聚科技有限公司 | A kind of liquid lens |
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| CN1942804A (en) * | 2004-04-16 | 2007-04-04 | 皇家飞利浦电子股份有限公司 | Liquid-based optical device and electronic device |
| JP2013101227A (en) * | 2011-11-09 | 2013-05-23 | Canon Inc | Liquid optical element and its control method |
| CN104102000A (en) * | 2013-04-10 | 2014-10-15 | 齐发光电股份有限公司 | Method for driving liquid lens |
| CN105490578A (en) * | 2014-09-16 | 2016-04-13 | 北京纳米能源与***研究所 | Composite nano power generator of contact separation type |
| CN106208800A (en) * | 2015-04-30 | 2016-12-07 | 北京纳米能源与***研究所 | A kind of slidingtype composite nano generator |
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