CN101630105B - Liquid-crystal zoom lens and electronic device - Google Patents

Abstract

The invention applies to the field of liquid-crystal lenses, and provides a liquid-crystal zoom lens and an electronic device. By connecting conductive media between every two adjacent annular waveband electrodes of transparent electrodes of a substrate and extracting the electrodes through gap channels of the annular waveband electrodes, the invention greatly reduces the number of pins required by a step electric field, is simple in control, reduces the interference in the step electric field, and reduces space area occupied by the substrate.

Description

A kind of liquid-crystal zoom lens and electronic installation

Technical field

The invention belongs to the liquid crystal lens field, relate in particular to a kind of liquid-crystal zoom lens and electronic installation.

Background technology

Along with the progress of optical technology, and the more and more higher requirement of portable set, traditional optical lens group can't be accomplished the contradiction of abundant balance miniaturization and quick-speed large-scale focusing, the liquid crystal camera lens arises at the historic moment, and has remedied this deficiency.

Characteristics such as the liquid-crystal zoom lens of Fresnel electrode form has good convergence of rays effect, can realize the function of optical lens, because its quality is little, cost is low, and focusing is convenient, and focal range is big, and control is simple, and shock resistance is good are expected to replace optical lens.The liquid-crystal zoom lens of traditional Fresnel electrode form generally all requires indium tin metal oxide, and (Indium Tin Oxides, ITO) conducting film is etched to the wavestrip structure, as shown in Figure 1.The optics Fresnel zone plate has two kinds of forms usually, and its printing opacity and light tight endless belt are equivalent to the projection on circular hole screen plane of all odd numbers or even level printing opacity and light tight wavestrip respectively, but the principal focal distance of this set wave strap is immutable.

If make light pass through to pass through liquid crystal layer again after the odd number half-wave zone (or even number half-wave zone), liquid crystal layer satisfies makes light wave produce 180 ° of phase shifts, just can make phase type liquid crystal zone plate.Prior art provides a kind of varifocal Fresnel Lenses, and the ITO conducting film of its two substrate inside surfaces up and down is etched to ring-type wavestrip electrode structure, and with a public straight belt electrode these ring-type wavestrip electrodes is coupled together.This method has only two extraction electrodes, and control is got up simple, but because each wavestrip is iso-electric, does not have the staged electric field, simple analog optics Fresnel Lenses only, and zooming range is very little, can not realize continuous vari-focus.

Prior art also provides a kind of ITO conducting film of substrate inside surface to be etched to the lens of ring-type wavestrip electrode structure, draw two extension lines respectively between its ring-type wavestrip electrode, connect extension line between the adjacent two ring-type wavestrip electrodes respectively by substitutional resistance, as shown in Figure 2, wherein 20 is drive signals, 101,102,103 and the different ring-type wavestrip electrode of other endless belt that do not mark representative, R1～R14 is a substitutional resistance, these lens adopt stepped-up voltage, adjustable focal length, but the good result that keeps lens need increase the quantity of annular ring-type wavestrip electrode, this must increase the number of extension line, for the monolithic substrate, mean to take very important space.And these extension lines can bring harmful effect to existing ladder electric field, finally make the focus of lens depart from the lens axis, simultaneously, also may cause light scattering.In addition, so many pin, control is got up also very complicated.

Summary of the invention

The purpose of the embodiment of the invention is to provide a kind of liquid-crystal zoom lens, and the electrode outlet line that is intended to solve the available liquid crystal zoom lens is many, causes the interference of ladder electric field greatly, and it is many to take up room, the control complicated problems.

The embodiment of the invention is achieved in that a kind of liquid-crystal zoom lens, and described liquid-crystal zoom lens comprises:

First substrate, its inside surface has first transparency electrode; And

Second substrate, its inside surface has second transparency electrode;

Described first transparency electrode comprises a plurality of Fresnel ring-type wavestrip electrodes, be connected with the conducting medium that places the described first substrate inside surface between every adjacent ring-type wavestrip electrode, each ring-type wavestrip electrode leaving certain gaps uncovered by the economic plan, form the breach passage, the ring-type wavestrip electrode of inner ring is drawn first extraction electrode through described breach passage, and the ring-type wavestrip electrode of outmost turns is drawn second extraction electrode corresponding with described first extraction electrode;

Described second transparency electrode has and described first extraction electrode the 3rd extraction electrode corresponding, that do not overlap, and with the corresponding gap slot of described breach passage;

After described first substrate and second substrate in combination were placed, described first extraction electrode was drawn by described breach passage and gap slot;

Described first extraction electrode and second extraction electrode disperse to be provided with;

The described conducting medium and first extraction electrode disperse to be provided with.

The embodiment of the invention is connected with conducting medium between every two the adjacent ring-type wavestrip electrodes of baseplate transparent electrode, breach passage extraction electrode by ring-type wavestrip electrode, significantly reduced the required pin number of ladder electric field, control is simple, reduced interference, reduced substrate occupation space area the ladder electric field.

Description of drawings

Fig. 1 is the structural representation of Fresnel Lenses zone plate in the prior art;

Fig. 2 is the structure principle chart of Fresnel liquid-crystal zoom lens in the prior art;

Fig. 3 is the vertical view of first substrate in the liquid-crystal zoom lens that provides of the embodiment of the invention first embodiment;

Fig. 4 is the vertical view of first substrate in the liquid-crystal zoom lens that provides of the embodiment of the invention second embodiment;

Fig. 5 is the vertical view of first substrate in the liquid-crystal zoom lens that provides of the embodiment of the invention the 3rd embodiment;

Fig. 6 is the vertical view of first substrate in the liquid-crystal zoom lens that provides of the embodiment of the invention the 4th embodiment;

Fig. 7 is the vertical view of first substrate in the liquid-crystal zoom lens that provides of the embodiment of the invention the 5th embodiment;

Fig. 8 is the vertical view of second substrate in the liquid-crystal zoom lens that provides of the embodiment of the invention;

Fig. 9 is the relative index of refraction of the liquid crystal that provides of the embodiment of the invention and the synoptic diagram that concerns of control voltage;

Figure 10 is the synoptic diagram that concerns between the effective refractive index of the liquid crystal that provides of the embodiment of the invention and the lens opening;

Figure 11, the 12nd, the synoptic diagram of the fan-shaped conducting medium between ring-type wavestrip electrode that the embodiment of the invention provides;

Figure 13 is the fundamental diagram of the liquid-crystal zoom lens that provides of the embodiment of the invention;

Figure 14 is the structural representation of first substrate in the liquid-crystal zoom lens that provides of sixth embodiment of the invention.

Embodiment

In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.

The embodiment of the invention is connected with conducting medium between every two the adjacent ring-type wavestrip electrodes of baseplate transparent electrode, breach passage extraction electrode by ring-type wavestrip electrode, can significantly reduce the electrode outlet line of lens, reduce the interference of electrode outlet line, reduce that substrate takes up room and the control complexity of lens the ladder electric field.

In embodiments of the present invention, liquid-crystal zoom lens comprises that inside surface has first substrate and second substrate of transparency electrode, and each transparency electrode surface of two substrates scribbles liquid crystal aligning layer, and two substrates is formed a liquid crystal cell, injects a liquid crystal layer in the liquid crystal cell.The transparency electrode of first substrate is etched into several Fresnel ring-type wavestrip electrodes, can adopt the ITO transparent conductive material, and liquid crystal aligning layer can adopt polyimide material, and liquid crystal layer can adopt nematic liquid crystal material.

Fig. 3 is the vertical view of first substrate in the liquid-crystal zoom lens that provides of the embodiment of the invention, the transparency electrode of first substrate 30 is etched into several Fresnel ring-type wavestrip electrodes 31, each ring-type wavestrip electrode has at least one breach, these breach form at least one breach passage 35, and the ring-type wavestrip electrode 31a of inner ring draws by breach passage 35.

Ring-type wavestrip electrode 31a draws first extraction electrode 33 through breach passage 35, and the ring-type wavestrip electrode 31b of outmost turns draws second extraction electrode 34.

Be connected with the conducting medium 32 that places the first substrate inside surface between every two adjacent ring-type wavestrip electrodes, to connect each adjacent ring-type wavestrip electrode, conducting medium 32 is equivalent to substitutional resistance, and each conducting medium is divided voltage equally after the series connection, plays connecting line between each ring-type wavestrip electrode.

In embodiments of the present invention, overlooking branch bulk storages such as can being 180 degree angles (as shown in Figure 3), 120 degree angles (as shown in Figure 4), an angle of 90 degrees on the face at this between first extraction electrode 33 and second extraction electrode 34 puts.

For dispersed electro-conductive medium 32, first extraction electrode 33,34 pairs of electric field effects of second extraction electrode, distance between first extraction electrode 33 and second extraction electrode 34 as far as possible away from, the distance between conducting medium 32 and first extraction electrode 33 and second extraction electrode 34 also try one's best away from.

As a preferred embodiment of the present invention, be 120 degree angles on the face and place overlooking between first extraction electrode 33, second extraction electrode 34 and the conducting medium 32, as shown in Figure 4.Certainly, for the ease of processing, conducting medium 32 can be coaxial with second extraction electrode 34, as shown in Figure 5.

In order to prevent the unbalanced influence of 32 pairs of whole lens performances of conducting medium, conducting medium 32 can be disperseed to distribute, as shown in Figure 6, when conducting medium 32 disperse three parts distributing respectively according to 12:00,2:00, when these three directions of 3:00 are arranged, adjacent two ring-type wavestrip electrodes are all the same with the all-in resistance of the structure of conducting medium 32 formation that disperse to distribute.Only otherwise too near from getting with first extraction electrode 33, orientations of conducting medium 32 each dispersion part can be any.

In order further to reduce the unbalanced influence of 32 pairs of whole lens performances of conducting medium, conducting medium 32 between two adjacent ring-type wavestrip electrodes can be divided into n part, wherein n is the positive integer more than or equal to 1, then n part is scattered in two annuluses between the adjacent ring-type wavestrip electrode, can staggers equably.For the ease of processing, the conducting medium 32 in the different annuluses can be positioned on the same axle, forms n axle.As an example of the present invention, as shown in Figure 7, each conducting medium between the two ring-type wavestrip electrodes can be divided into 4 parts, and around the electrode centers symmetrical distribution, avoid single conducting medium to make lens focus depart from the geometric centre axes of lens as far as possible, each conducting medium of each part is coaxial, is an angle of 90 degrees between each adjacent shaft.Certainly, each conducting medium also can be divided into 3 equal portions, each part is distributed on 3 axles then, be 120 degree angles between each adjacent shaft, being 120 degree angles between first extraction electrode 33 and second extraction electrode 34 places, the branch cloth beam of conducting medium is 60 degree angles with contiguous extraction electrode and arranges better effects if.

In embodiments of the present invention, the resistance value of each conducting medium equates.Excessive for fear of the voltage that conducting medium is got, its side's resistance preferably is equal to or greater than side's resistance of ring-type wavestrip electrode 31.As one embodiment of the present of invention, conducting medium 32 can adopt and the identical or different material of ring-type wavestrip electrode 31 sides resistance, when the side resistance of the conducting medium 32 side's resistance greater than ring-type wavestrip electrode 31, and the material of its material and ring-type wavestrip electrode 31 is when identical, and effect is better.Certainly, for the ease of processing, conducting medium 32 and ring-type wavestrip electrode 31 can adopt equal resistance and identical materials.

Fig. 8 is the vertical view of second substrate in the liquid-crystal zoom lens that provides of the embodiment of the invention, and the transparency electrode 42 of second substrate, 40 inside surfaces is round pie, and electrode 42 is drawn the 3rd extraction electrode 41, the three extraction electrodes 41 and first extraction electrode 33 does not overlap.

Gap slot 43 and breach passage 35 are in same position when also having gap slot 43, the first substrates 30 corresponding with breach passage 35 in first substrate 30 and 40 overlapping placement of second substrate on electrode 42.After first substrate 30 and 40 combinations of second substrate were placed, first extraction electrode 33 was drawn by gap slot 43 and breach passage 35, keeps independent with ring-type wavestrip electrode 31, and little to the interference of electric field, insulation effect is good.

In embodiments of the present invention, the voltage swing by on the control ring-type wavestrip electrode 31 changes the refractive index of liquid crystal, thereby the focal length of lens is continuously changed.The relation of the relative index of refraction of liquid crystal and control voltage as shown in Figure 9, in the interval of two dotted lines, be approximated to linear relationship between the relative index of refraction of liquid crystal and the voltage, that is to say that control voltage when this scope, can carry out linear modulation to the refractive index of liquid crystal.

Figure 10 shows the effective refractive index of the liquid crystal that the embodiment of the invention provides and the relation between the lens opening.

The calculating principle of effective refractive index is as follows:

Certain voltage is applied on the camera lens, and the effective refractive index of liquid crystal is:

N _eff＝N _o-c ₁R ²-c ₂R ⁴+c ₃R ⁶+c ₄R ⁸+… (1)

Wherein, N _oBe the ordinary refraction index of liquid crystal, R is the aperture of camera lens, c _iBe constant, i=1～N since when i more than or equal to 5 the time, the item number of back is very little to whole result's influence, can ignore, and generally gets i=1～4, is determined by following formula:

$c_1=\frac{1}{2\mathrm{fd}},---\left(2\right)$

$c_2=\frac{1}{{{2\mathrm{<figure-callout\; id="1"\; label="c"\; filenames="S2008100685179E00052.png,S2008100685179E00062.png"\; state="\{\{state\}\}">c</figure-callout>}}_1}^2},---\left(3\right)$

$c_3=\frac{1}{{{4\mathrm{<figure-callout\; id="1"\; label="c"\; filenames="S2008100685179E00052.png,S2008100685179E00062.png"\; state="\{\{state\}\}">c</figure-callout>}}_1}^4},---\left(4\right)$

$c_4=\frac{1}{{{8\mathrm{<figure-callout\; id="1"\; label="c"\; filenames="S2008100685179E00052.png,S2008100685179E00062.png"\; state="\{\{state\}\}">c</figure-callout>}}_1}^6},---\left(5\right)$

$c_5=\frac{1}{{{16\mathrm{<figure-callout\; id="1"\; label="c"\; filenames="S2008100685179E00052.png,S2008100685179E00062.png"\; state="\{\{state\}\}">c</figure-callout>}}_1}^8},---\left(6\right)$

Wherein, f is a lens focus, and d is a thickness of liquid crystal layer.

The radius of supposing ring-type wavestrip electrode 32 is 0.3mm, and the gap between the ring-type wavestrip electrode 32 is 3um, ring-type wavestrip electrode 32 add up to 10, thickness of liquid crystal layer is 6um, the ordinary refraction index N of liquid crystal _o=1.74, regulate driving voltage and make the effective refractive index N of liquid crystal _Eff=1.50, then lens focus is 51.68cm.Change control voltage, this focal length just can change, and reaches the purpose of zoom.

Fan-shaped conducting medium with employing ITO material is an example, shown in Figure 11,12, supposes the n that adds up to of ring-type wavestrip electrode 32, for the conducting medium between n-1 and the n loop wavestrip electrode,

According to the resistance formula

Wherein ρ is a resistivity, and l is a resistance length, and S is the resistance cross-sectional area, and the thickness of establishing conducting medium is d, and side's resistance is R, and subtended angle is θ, and width is dr (dr → 0), and wavestrip gaps between electrodes width is gap.

Conducting medium is divided into m part, so, side's resistance R of each part conducting medium _mFor:

$R_m=\mathrm{\&rho;}\frac{l}{S}=\mathrm{\&rho;}\frac{\mathrm{dr}}{\frac{2\mathrm{\&pi;r}}{m}d}---\left(7\right)$

Like this, subtended angle is θ, and width is side's resistance R of the fan-shaped conducting medium of dr _θFor:

$R_{\mathrm{\&theta;}}=\frac{R_m}{m}\&CenterDot;\frac{2\mathrm{\&pi;}}{\mathrm{\&theta;}}=\frac{\mathrm{\&rho;}\frac{\mathrm{mdr}}{2\mathrm{\&pi;rd}}}{m}\&CenterDot;\frac{2\mathrm{\&pi;}}{\mathrm{\&theta;}}=\frac{\mathrm{\&rho;}}{\mathrm{\&theta;d}}\&CenterDot;\frac{\mathrm{dr}}{r}---\left(8\right)$

For the ring resistance that can be decomposed into infinite width be dr of the fan-shaped conducting medium between n-1 and the n loop wavestrip electrode, so whole width is that the size of the fan-shaped conducting medium of gap is:

$R_n={\&Integral;}_{r_n}^{\mathrm{gap}+r_{n-1}}{R}_m$

$={\&Integral;}_{r_n}^{\mathrm{gap}+r_{n-1}}\frac{\mathrm{\&rho;}}{{\mathrm{\&theta;}}_{n}d}\&CenterDot;\frac{\mathrm{dr}}{r}$

$=\frac{\mathrm{\&rho;}}{{\mathrm{\&theta;}}_{n}d}\&CenterDot;{\&Integral;}_{r_n}^{\mathrm{gap}+r_{n-1}}\frac{\mathrm{dr}}{r}$

$=\frac{\mathrm{\&rho;}}{{\mathrm{\&theta;}}_{n}d}\&CenterDot;[\ln (\mathrm{gap}+r_{n-1})-\ln r_{n-1}]$

$=\frac{\mathrm{\&rho;}}{{\mathrm{\&theta;}}_{n}d}\&CenterDot;\ln (1+\frac{\mathrm{gap}}{r_{n-1}})$

$=\frac{\mathrm{\&rho;}}{d}\&CenterDot;\frac{\ln (1+\frac{\mathrm{gap}}{\sqrt{n-1}{r}_1})}{{\mathrm{\&theta;}}_n}$

$=R\&CenterDot;\frac{\ln (1+\frac{\mathrm{gap}}{\sqrt{n-1}{r}_1})}{{\mathrm{\&theta;}}_n}---\left(9\right)$

By formula (9) as can be seen

${\mathrm{\&theta;}}_n=R\&CenterDot;\ln (1+\frac{\mathrm{<figure-callout\; id="1"\; label="gap\; r"\; filenames="S2008100685179E00052.png,S2008100685179E00062.png"\; state="\{\{state\}\}">gap</figure-callout>}}{r_{}}\&CenterDot;\frac{1}{\sqrt{n-1}})/R_n---\left(10\right)$

If get R _n=1k Ω, d=1.1mm, R=200 Ω, gap=0.03mm gets different n (1≤n≤10, n is an integer) respectively, calculates according to (10) formula shown in the subtended angle following table of 10 fan-shaped conducting mediums:

r n-1(mm)	r n(mm)	gap(mm)	Δn(rad)
				0	0.3000	0.03	0
0.3300	0.4243	0.03	0.0191

0.4543	0.5196	0.03	0.0137
				0.5496	0.6000	0.03	0.0112
0.6300	0.6708	0.03	0.0098
				0.7008	0.7348	0.03	0.0088
0.7648	0.7937	0.03	0.0080
				0.8237	0.8485	0.03	0.0074
0.8785	0.9000	0.03	0.0069
				0.9300	0.9487	0.03	0.0066

Figure 13 shows the principle of work of liquid-crystal zoom lens in the embodiment of the invention, and first extraction electrode 33, second extraction electrode 34 are connected SEG electrode and COM electrode respectively, and the 3rd extraction electrode 41 connects on the COM electrode.The ac square wave signal be connected in and first extraction electrode 33 and second extraction electrode 34 between, perhaps between second extraction electrode 34 and the 3rd extraction electrode 41.Adjust voltage, these lens can be realized the function of convex lens or concavees lens.

In embodiments of the present invention, the ac square wave signal be connected in and first extraction electrode 33 and the 3rd extraction electrode 41 between, can realize the function of concavees lens, the ac square wave signal be connected in and second extraction electrode 34 and the 3rd extraction electrode 41 between, can realize the function of convex lens.For a kind of lens pattern (convex lens or concavees lens), regulate the ac square wave signal, change voltage amplitude or change driving frequency, can adjust the focal length of lens, thereby realize the zoom function of liquid crystal lens.

Figure 14 is the schematic construction of first substrate in the liquid-crystal zoom lens that provides of sixth embodiment of the invention, in order to make lens possess the function of three-dimensional regulation, the ring-type wavestrip electrode 31a of inner ring is divided at least 3 parts, for example a semi-circular portions and two fan-shaped parts, and draw three extraction electrodes 331,332,333 respectively, ring-type wavestrip electrode 31 all is provided with breach with the intersection of extraction electrode 311,312,313, forms 3 breach passages.In second quadrant between extraction electrode 331 and the extraction electrode 332, the ring-type wavestrip electrode 32b of outmost turns and extraction electrode 332 intersect, its extraction electrode 342 and 343 ground connection, extraction electrode 341 connects the sliding end of variable resistor R2, variable resistor R1 or R2 are connected between extraction electrode 331 and extraction electrode 342 or the extraction electrode 343, sliding end is connected with extraction electrode 332 or extraction electrode 341 respectively, is used to change the position of liquid-crystal zoom lens focus.The amplitude of voltage (V) can make the prime focus of lens move on the paper vertical direction between the scallop of regulating the semi-circular portions of first extraction electrode and second extraction electrode was divided; When V one timing, regulate two variable resistor R ₁, R ₂, the focus of lens is moved on the plane at paper place.First extraction electrode of semi-circular portions for one, two quadrant provides gradient voltage from inside to outside, and one, the voltage of the outmost turns of two quadrant and different, depend on two dividing potential drop variable resistor R respectively ₁, R ₂Therefore, control moving of focus respectively, reach the three-dimensional adjustable purpose of focus in 45 degree, 135 degree directions.

Corresponding, second substrate, 40 transparency electrodes also have and above-mentioned extraction electrode 331,332,333 three extraction electrodes corresponding, that do not overlap, and 3 the gap slot (not shown)s corresponding with 3 breach passages of first substrate 30.

When the liquid crystal zoom lens that the making embodiment of the invention provides:

At first, with photoetching process the ring-type wavestrip electrode of two substrates is etched into said structure respectively, the difference that this topology layout is equivalent to adjacent ring-type wavestrip electrode voltage amplitude equates, promptly the electric field of lens inside is etc. stair-stepping.

Then, coat polyimide alignment layers on the ITO surface, the oriented layer frictional direction is vertical mutually up and down in order.

Then, first substrate and two substrates of second substrate are stacked, make liquid crystal cell, and inject nematic liquid crystal.

At last, first electrode, second electrode are connected SEG electrode and COM electrode respectively,, make this liquid-crystal zoom lens work in the lens mode by between SEG electrode and COM electrode, applying the voltage of certain amplitude.

The liquid-crystal zoom lens that the embodiment of the invention provides can be widely used in the electronic installations such as digital camera, mobile phone, PDA.

The embodiment of the invention is connected with conducting medium between every two the adjacent ring-type wavestrip electrodes of baseplate transparent electrode, breach passage extraction electrode by ring-type wavestrip electrode, significantly reduced the required pin number of ladder electric field, control is simple, reduced interference, reduced substrate occupation space area the ladder electric field.Simultaneously, staggered in the position of extraction electrode and conducting medium, eliminated the influence of extraction electrode as much as possible lens effect.

The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.

Claims (7)

1. a liquid-crystal zoom lens is characterized in that, described liquid-crystal zoom lens comprises:

First substrate, its inside surface has first transparency electrode; And

Second substrate, its inside surface has second transparency electrode;

Described first transparency electrode comprises a plurality of Fresnel ring-type wavestrip electrodes, be connected with the conducting medium that places the described first substrate inside surface between every adjacent ring-type wavestrip electrode, each ring-type wavestrip electrode leaving certain gaps uncovered by the economic plan, form the breach passage, the ring-type wavestrip electrode of inner ring is drawn first extraction electrode through described breach passage, and the ring-type wavestrip electrode of outmost turns is drawn second extraction electrode corresponding with described first extraction electrode;

Described second transparency electrode has and described first extraction electrode the 3rd extraction electrode corresponding, that do not overlap, and with the corresponding gap slot of described breach passage;

After described first substrate and second substrate in combination were placed, described first extraction electrode was drawn by described breach passage and gap slot;

Described first extraction electrode and second extraction electrode disperse to be provided with;

The described conducting medium and first extraction electrode disperse to be provided with.

2. liquid-crystal zoom lens as claimed in claim 1 is characterized in that, is 120 degree angles on plane, the first substrate place between described conducting medium, first extraction electrode and second extraction electrode and distributes.

3. liquid-crystal zoom lens as claimed in claim 1 is characterized in that, the conducting medium between every adjacent ring-type wavestrip electrode is coaxial, perhaps disperses to distribute.

4. liquid-crystal zoom lens as claimed in claim 3 is characterized in that, the conducting medium between every adjacent ring-type wavestrip electrode is coaxial with described second extraction electrode.

5. liquid-crystal zoom lens as claimed in claim 1 is characterized in that, the conducting medium between every adjacent ring-type wavestrip electrode is divided into many parts, disperses in the space between every adjacent ring-type wavestrip electrode to distribute.

6. liquid-crystal zoom lens as claimed in claim 1 is characterized in that, the material of described conducting medium is identical with the material of described ring-type wavestrip electrode, and its side's resistance is equal to, or greater than side's resistance of described ring-type wavestrip electrode.

7. electronic installation that comprises each described liquid-crystal zoom lens of claim 1 to 6.

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