KR102326252B1 - Three-dimensional focal variable fresnel gel lens with flat electrodes - Google Patents

Abstract

The three-dimensional variable focus Fresnel-type gel lens having a flat electrode according to the present invention is formed on a substrate, and a light collecting member for refracting light incident through the inclined surface is provided in the form of concavo-convex cross-section having an inclined surface. and a transmissive part in which the inclination angle of the inclined surface is varied when voltage is applied to the electrode and the second electrode, wherein at least one of the first electrode and the second electrode is formed in plurality and voltage is applied separately to the transmissive part By changing the shape of the three-dimensional, it is characterized in that the focus position of the light passing through the transmission part is changed in three dimensions.

Description

THREE-DIMENSIONAL FOCAL VARIABLE FRESNEL GEL LENS WITH FLAT ELECTRODES

The present invention relates to a variable focus lens in which the curvature of the lens is variable based on an electrical signal, and more particularly, a three-dimensional variable focus Fresnel gel having a planar electrode in which the curvature of the lens surface is three-dimensionally variable according to an applied voltage. It's about lenses.

In general, a lens is used in various electronic devices such as a camera, and is a device capable of focusing one or more wavelengths of light. Recently, development of a variable lens that can be used in miniaturized and multi-functional electronic devices is being made, and in order to adjust the focus of a photographed image, a method for adjusting the focus of an image by variably controlling the shape without changing the position of the lens are being studied Examples include a method of controlling the shape of a lens using hydraulic pressure, a method of controlling the shape of liquid crystal according to voltage application, and a method of controlling a liquid lens that can adjust the focal length in the optical axis direction using electrowetting phenomenon. .

However, since the method as described above has additional parts for shape control, it is difficult to achieve miniaturization, there is a limit in the lens focusing range, and the problem that it is not applicable to a multifocal lens array structure has been continuously raised. .

In addition, research using a Fresnel lens that is used as lighting in lighthouses or is used for concentrated photovoltaics and can have the same function as a convex lens even though it is formed thinner than the thickness of a convex lens However, the Fresnel lens has a problem in that it cannot be applied as a variable focus lens because the depth or interval of the incident surface on which the light is incident must be uniformly formed.

In particular, liquid lenses using the electrowetting phenomenon can only adjust the auto focus distance in the optical axis direction (Auto Focus, hereafter referred to as AF), but cannot move the focus in the horizontal direction in the optical axis direction, so optical image stabilization (OIS) ) was not possible.

The present invention is an invention devised to solve the problems of the prior art, and the present invention provides a light collecting member in the form of a Fresnel lens, which is formed of an electroactive polymer and has a variable shape, and according to the voltage applied to the transmitting part, An object of the present invention is to provide a variable focus lens in which the focal position of light passing through a transmission unit is changed in three dimensions by three-dimensionally deforming the shape.

The problems of the present invention are not limited to the problems mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.

A three-dimensional focus-variable Fresnel-type gel lens having a planar electrode of the present invention for achieving the above object is formed on a substrate, the first electrode and the second electrode having different polarities; It is formed of an electroactive polymer and has a concave-convex cross-section having an inclined surface, and a light collecting member for refracting light incident through the inclined surface is provided. include

Here, the light collecting member is characterized in that it is provided as a ring-shaped unit lens in which the concave-convex section having an inclined surface is continuously arranged in the circumferential direction.

Here, a plurality of the unit lenses are formed to have the same central axis on the same plane, and are continuously arranged in a radial direction from the central axis.

In addition, the unit lens is characterized in that the length from the central axis to the inclined surface has a predetermined ratio.

And at least one of the first electrode and the second electrode is formed in plurality and a voltage is applied individually to deform the shape of the transmission part in three dimensions, so that the focal position of the light passing through the transmission part is changed in three dimensions characterized.

In addition, the electrode formed as a plurality of the first electrode and the second electrode is characterized in that it is composed of a plurality of unit electrodes to which voltages are individually applied on the substrate.

And by blocking the electrical interference between the plurality of unit electrodes, it further includes a distortion preventing portion for preventing shape distortion of the transmission portion.

Here, the distortion prevention part is formed on the substrate such that the plurality of unit electrodes are spaced apart from each other at a predetermined interval.

In addition, the predetermined interval is characterized in that 50㎛ to 1000㎛.

And the transmissive part is disposed on the upper side of the substrate so that the light collecting member is deformed when a voltage is applied, and the first electrode and the second electrode are provided with a plurality of unit electrodes between the substrate and the transmissive part, The first electrode is provided to correspond to the light collecting member of the transmissive part, the second electrode is formed on the same plane as the first electrode, and is provided to partially wrap around the first electrode at a predetermined distance. characterized.

Here, the predetermined distance is a distance between the first electrode and the second electrode, and a short circuit between the first electrode and the second electrode is prevented.

In addition, the preset distance is a distance between the first electrode and the second electrode, and is set in response to a voltage in a preset range applied from the first electrode and the second electrode to the transmissive part.

By changing the shape of the transmission part in three dimensions according to the applied voltage of the present invention, the focal position of the light passing through the transmission part is changed in three dimensions, so that not only automatic focal length adjustment in the optical direction but also hand shake phenomenon can be corrected. There are advantages.

In addition, by having a configuration of a Fresnel-type gel lens that is three-dimensionally variable to enable not only automatic focal length adjustment in the optical direction but also correction of hand shake, a three-dimensional variable focus Fresnel-type gel lens with flat electrodes is included. There is an advantage that miniaturization of electronic devices can be made possible.

Effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

The summary set forth above as well as the detailed description of the preferred embodiments of the present application set forth below may be better understood when read in conjunction with the accompanying drawings. For the purpose of illustrating the invention, there are shown in the drawings preferred embodiments. It should be understood, however, that the present application is not limited to the precise arrangements and instrumentalities shown.
1 is a schematic cross-sectional view for expressing the overall configuration of a three-dimensional variable focus Fresnel type gel lens having a planar electrode according to an embodiment of the present invention, and FIG. 2 is a three-dimensional view having a planar electrode according to an embodiment. It is a view showing a state in which an anti-distortion part is formed on an upper portion of a substrate in which a plurality of electrodes of a red focus variable Fresnel type gel lens are provided on the same plane, and FIGS. A schematic diagram showing a state in which a voltage is applied to a light collecting member of a three-dimensional variable focus Fresnel gel lens having a flat electrode, and FIG. 4 is a three-dimensional variable focus Fresnel gel having a flat electrode according to an embodiment of the present invention. It is an AA` cross-sectional view showing a state in which no voltage is applied to the first electrode and the second electrode of the lens, and FIG. 5 is a planar electrode of a three-dimensional variable focus Fresnel gel lens having a flat electrode according to an embodiment of the present invention. AA′ is a cross-sectional view showing a state in which the optical focal length is shortened in the optical axis direction by applying voltage to the first and second electrodes of a three-dimensional variable focus Fresnel gel lens having As voltages are individually applied to the first and second electrodes of a three-dimensionally variable focus Fresnel gel lens having a planar electrode according to `It is a cross-sectional view, and FIG. 7 is an axial direction of the light focus as voltages are individually applied to the first and second electrodes of the three-dimensional focusable Fresnel-type gel lens having a planar electrode according to an embodiment of the present invention. It is an AA` cross-sectional view showing the concentration to the other side in the horizontal direction based on .

Hereinafter, preferred embodiments of the present invention in which the object of the present invention can be specifically realized will be described with reference to the accompanying drawings. In describing the present embodiment, the same names and the same reference numerals are used for the same components, and an additional description thereof will be omitted.

The present invention relates to a three-dimensional variable focus Fresnel-type gel lens having a planar electrode and will be described in detail with reference to the drawings.

1 is a schematic cross-sectional view for expressing the overall configuration of a three-dimensional variable focus Fresnel-type gel lens having a planar electrode according to an embodiment of the present invention;

FIG. 2 is a view showing a state in which a distortion-preventing part is formed on a substrate in which a plurality of electrodes of a three-dimensional variable focus Fresnel-type gel lens having a planar electrode according to an embodiment are provided on the same plane;

3 (a) and (b) are schematic views showing a state in which a voltage is applied to a light collecting member of a three-dimensional variable focus Fresnel type gel lens having a flat electrode according to an embodiment of the present invention;

Figure 4 is a cross-sectional view A-A' showing a state in which no voltage is applied to the first electrode and the second electrode of the three-dimensional variable focus Fresnel-type gel lens having a flat electrode according to an embodiment of the present invention;

5 is a diagram illustrating voltage applied to first and second electrodes of a three-dimensionally variable focus Fresnel-type gel lens having flat electrodes of a three-dimensionally variable focus Fresnel-type gel lens having flat electrodes according to an embodiment of the present invention; AA` cross-sectional view showing how the optical focal length is shortened in the optical axis direction;

6 is a view showing that the optical focus is horizontal with respect to the axial direction of the light as voltages are individually applied to the first and second electrodes of the three-dimensionally variable focus Fresnel-type gel lens having a planar electrode according to an embodiment of the present invention; AA` cross-sectional view showing the focus on one side of the direction;

7 is a view showing that the optical focus is horizontal with respect to the axial direction of the light as voltages are individually applied to the first and second electrodes of the three-dimensionally variable focus Fresnel-type gel lens having a planar electrode according to an embodiment of the present invention; It is an AA` cross-sectional view showing the state concentrated to the other side of the direction.

Referring to FIG. 1 , the configuration of a three-dimensional variable focus Fresnel-type gel lens 10 having a planar electrode according to a first embodiment of the present invention is largely composed of a first electrode 100, a second electrode 200, and a transmission part ( 300) may be included.

The first electrode 100 is formed on the substrate 400 and is configured to have a polarity different from that of the second electrode 200 , so that a voltage may be applied from an external power source.

In addition, the second electrode 200 is formed on the substrate 400 and is configured to have a polarity different from that of the first electrode 200 , so that a voltage may be applied from an external power source.

Here, at least one of the first electrode 100 and the second electrode 200 may be formed in plurality, so that voltages may be individually applied thereto.

Specifically, when the first electrode 100 and the second electrode 200 are formed in plurality, the first electrode 100 is the first unit electrode 120 and the first electrode lead connected to the first unit electrode 120 . 140 may be included, and the first electrode lead 140 connected to one side of the first unit electrode 120 may be connected to an external power source.

In addition, the plurality of second electrodes 200 may include a second unit electrode 220 and a second electrode wire 240 connected to the second unit electrode 220 , and one side of the second unit electrode 220 is connected to the second unit electrode 220 . The second electrode wire 240 connected to may be connected to an external power source.

In addition, the transmission part 300 is formed of an electro-active polymer (hereinafter referred to as EAP), and a light collecting member 320 that refracts light incident through the inclined surface 324 is provided in the form of a concave-convex cross-section having an inclined surface. When a voltage is applied to the first electrode 100 and the second electrode 200 , the inclination angle of the inclined surface 324 is changed, so that the focal position of the light passing through the transmitting part 300 can be changed in three dimensions.

Here, the light collecting member 320 may be provided as a ring-shaped unit lens 322 in which irregularities having a cross-section having an inclined surface 324 are continuously arranged in the circumferential direction. It may be formed to have the same central axis, and may be continuously arranged in a radial direction from the central axis.

That is, the light collecting member 320 may be a circular pattern in which a plurality of unit lenses 322 are arranged, for example, a ring-shaped unit lens ( 322) is disposed on any one plane of the transmission part 320, the width of the concavo-convex is 0.2mm so as to be adjacent to the outer circumferential surface of the arranged 1mm diameter unit lens 322, and the unit lens having a diameter of 1.4mm from the central axis to the outer circumferential surface 322 may be disposed. In this case, the two unit lenses 322 arranged may have the same central axis. Similarly, the unit lens 322 disposed next may also have a concave-convex width of 0.2 mm and a unit lens 322 having a diameter of 1.8 mm from the central axis to the outer circumferential surface may be arranged, repeatedly arranged in a radial direction from the central axis. can be

That is, as a whole, the light collecting member 320 is formed on the same plane of the transmission part 320 , and may be provided in a circular pattern that has the same central axis and is continuously arranged in a radial direction.

At this time, the cross-section of the ring-shaped unit lens 322 has a triangular shape symmetrical with respect to the central axis, and may have, for example, inclined surfaces 324 facing each other, and the light collecting member 320 has a constant height of the unevenness. In addition, the inclined surface 324 on which the light is incident may be formed as a spherical surface, the interval between the irregularities may be constant, and the inclined surface 324 on which the light is incident may be designed in a flat shape.

As described above, as the inclination angle of the inclined surface 324 is provided to be variable, when a voltage is applied to the first electrode 100 and the second electrode 200, the shape is deformed in three dimensions and passes through the transmission part 300 The focal position of the light can be varied in three dimensions.

In other words, the transmission part 300 may be in the form of a thin film in which a Fresnel lens is provided on the substrate 400 . In order to perform the role of a lens, it is essential to be transparent, and it is preferable to use a gel form, not a liquid, which has a certain shape and whose surface shape is changed depending on whether a voltage is applied. For this, polyvinyl chloride (PVC), polyethylene, etc. The transmission part 300 may be formed using the same general-purpose polymer, and may be formed of a conductive polymer, but is not limited thereto. Single-wall carbon nanotube, Multi-wall carbon nanotube wall carbon nanotube), Nafion polymer, and SSEBS may be coated on the upper surface of the substrate 400 to completely cover the first electrode 100 and the second electrode 200 formed on the substrate 400 .

In addition, when power is not applied to the first electrode 1100 and the second electrode 1200 , the transmission part 1300 is preferably formed so that the thickness of the surface thereof is constant.

On the other hand, the substrate 400 may be a light-transmitting substrate, and specifically, as a component constituting the base of the first electrode 1100 and the second electrode 1200 , a flexible substrate, a plate, or glass, which is a flexible film material. It may be any one material, and it is preferable to use a material having high light transmittance.

Referring to FIG. 2 , the configuration of the first electrode 100 and the second electrode 200 according to the first embodiment of the present invention will be described in detail. The first electrode 100 and the second electrode 200 are the substrates. It is disposed on 400, the first electrode 100 is provided with a plurality of first unit electrodes 120a, 120b, 120c, and 120d, and the second electrode 200 is provided with a plurality of second unit electrodes 220a and 220b. , 220c, 220d) may be provided.

Also, the first electrode 100 may be disposed on the same plane as the second electrode 200 and spaced apart from the second electrode 200 by a predetermined distance to partially surround the second electrode 200 .

The substrate 400 is formed as a square flat plate through which light can pass, and the first unit electrodes 120a, 120b, 120c, and 120d may be formed in the same shape on the upper central side of the substrate 400, and may have a predetermined shape. The first electrode wires 140a, 140b, so that an external power source can be connected to one side of each of the first unit electrodes 120a, 120b, 120c, 120d, and to form a radial pattern on one surface of the substrate as a whole. 140c, 140d) are provided.

Specifically, the first unit electrodes 120a, 120b, 120c, and 120d may have a sectoral shape having the same central angle, and first electrode wires 140a, 140b, 140c, and 140d are provided on one side of the formed arc, and the first electrode wires ( 140a, 140b, 140c, and 140d may be disposed to contact one surface of the substrate 400 .

In addition, second electrode wires 240a, 240b, 240c, and 240d are provided so that the second unit electrodes 220a, 220b, 220c, and 220d can also be connected to an external power source, and the first unit electrodes 120a, 120b, 120c, and 120d are provided. ) may be formed to be spaced apart by a predetermined distance (d1, d2). Referring to a region on one side of the upper portion of the substrate 400 with reference to FIG. 3 , one first unit electrode 120c and the other first unit electrode 120c have a bar shape in which one of the second unit electrodes 220c has a curvature. It may be provided in a radial pattern to surround a part of the unit electrode 120d.

In addition, the second unit electrode 220c and the first unit electrodes 120c and 120d are spaced apart by a predetermined distance d1, and spaced apart by d2 from the first electrode wire 140c connected to the first unit electrode 120c. and may be provided to be spaced apart from the first electrode lead 140d connected to the first unit electrode 120d by d2.

The distance between the other first electrode 100 and the second electrode 200 disposed on the other side of the substrate 400 is also the same as the above-described distances d1 and d2.

In other words, the first unit electrodes 120a, 120b, 120c, and 120d and the second unit electrodes 220a, 220b, 220c, and 220d are all spaced apart by d1, and the second unit electrodes 220a, 220b, 220c, 220d ) and the first electrode lead, the first electrode 100 and the second electrode 200 may be provided on the substrate 400 to be spaced apart by d2.

In this case, the predetermined distances d1 and d2 between the first electrode 100 and the second electrode 200 may prevent a short circuit between the two electrodes.

In addition, since the preset distances d1 and d2 are inversely proportional to the strength of the electric field formed between the first electrode 100 and the second electrode 200 , it is set corresponding to the voltage in the preset range applied to the transmission part 300 . can be

Specifically, if the preset distance d1, d2 on the plate is too close, a short circuit between the first electrode 100 and the second electrode 200 may cause an overcurrent, and the preset distance d1, d2 on the substrate may be too close. If it is far away, a mechanism in which electrical connection between the first electrode 100 and the second electrode 200 is impossible may be implemented.

For this reason, the first electrode for minimizing the electric power supplied between the first electrode 1100 and the second electrode 1200 from the external power source by presetting a range of voltage required to change the shape of the transmission part 1300 . There is an advantage that the distance between 100 and the second electrode 200 can be preset.

Specifically, it is preferable that the range of the voltage required to change the shape of the transmission part 300 is set to 1 [V] to 10 [V].

In addition, the three-dimensional variable focus Fresnel-type gel lens 10 having a flat electrode can be provided in the form of a core optical element array having various application fields, such as optical communication element-dimensional display, large-capacity optical information recording medium, etc. by arranging a plurality of lenses. And specifically, it may be a micro lens array.

In this case, the material used for the first electrode 100 and the second electrode 200 is preferably selected in consideration of chemical stability at room temperature, high visible light transmittance, and excellent etching characteristics, and specifically, high transmittance (80%) in the visible light region. above) and high electrical conductivity (resistivity of 10-3 cm or less) at the same time may be a transparent conductive film.

Specifically, the material used for the first electrode 100 and the second electrode 200 may be a wide-gap semiconductor having an optical bandgap of 3.5 eV or more for the transparent conductive film, and tin (Sn) is substituted for indium oxide (In2O3). It may be any one of ITO dissolved in solid solution, ATO in which Sb is substituted for solid solution in tin oxide (SnO2), and AZO and GZO in which Al or Ga is substituted and solid-dissolved in zinc oxide (ZnO).

In addition, when the first electrode 100 and the second electrode 200 are ITO transparent conductive films, the first electrode 100 and the second electrode 200 may be formed in the form of a thin film on the substrate 400 . In particular, vacuum deposition on the upper portion of the substrate 400 by sputtering or ITO as a paint may be applied to the upper portion of the substrate 400 .

Referring in detail to the principle in which the focus of the output light Lpab is varied by changing the angle of the inclined surface 324 according to the voltage applied through FIG. 3 , the voltage is applied to the first electrode 100 and the second electrode 200 . As the light collecting member 320 is stretched in the horizontal direction of the light, the inclination angle is changed in response to the voltage applied to the inclined surface 324 formed on the unit lens 322, and accordingly, the focus of the light passing through the inclined surface 324 The location can be changed.

Specifically, when a voltage is applied to the first electrode 100 and the second electrode 200 , the light collecting member 320 having the shape of FIG. 3 (a) may be stretched as a whole in the shape of FIG.

As the light collecting member 320 is deformed to the left and right, the radius L1 of the unit lens 322 having the inclined surface 324 formed at a first inclination angle with respect to the center of the light collecting member 320 is transformed into L`1, and the second As the radius L2 of the unit lens 322 having the inclined surface 324 formed at 2 inclination angles is transformed into L'2 and the radius L3 of the unit lens 322 having the third inclination angle is transformed into L'3, each inclined surface ( There is an advantage that the inclination angle of the 324 is changed so that the focus of the light passing through the light collecting member 320 can be varied.

Specifically, when a plurality of unit lenses 322 are formed to have the same central axis on the same plane and are continuously arranged in a radial direction from the central axis, the length from the central axis to the inclined surface 324 may have a preset ratio. .

For example, the radius L1 of the unit lens 322 concentric with the central axis of the light collecting member 320 of the circular pattern is 1 m, and the other unit lens 322 is in contact with the outer peripheral surface of the unit lens 322 having a radius L1. ), assuming that the radius (L2) is 2 mm, the ratio of the radius (L2) to the radius (L1), that is, the preset ratio is 2, and therefore the ratio of the radius (L3) to the radius (L2) should also be 2 Therefore, it is preferable that the radius L3 of the unit lens 322 positioned at the outermost part in FIG. 3A is set to 4mm.

Looking in detail at the action of the three-dimensionally variable focus Fresnel-type gel lens 10 having a flat electrode based on FIG. 4 showing a state in which no voltage is applied, the first electrode 100 formed in plurality is formed as an anode (+). When the plurality of second electrodes 200 are formed as a negative electrode (-), a voltage can be supplied between the first electrode 100 and the second electrode 200 by an external power source.

At this time, the focus of the output light is concentrated by the light collecting member 320 in which the angle of the inclined surface 324 is formed in advance.

Next, as shown in Fig. 5, as electrons are charged in the transmission part 300 from the second electrode 200 to which the cathode of the external power is connected, the charging density of the transmission part 300 increases, and electrostatic repulsion force (electrostatic rpulsion force). ) as shown in FIG. 5 , the light collecting member 320 may protrude in a direction opposite to the propagation direction of the light incident on the transmitting part 300 as electrons are concentrated toward the plurality of first electrodes 100 .

As a result, as described with reference to FIG. 3 , the inclination angle of the inclined surface 324 of the unit electrode 322 is varied while being deformed in a horizontally stretched form, and the focus F1 of the output light described above in FIG. 4 is changed to F2. And, it is possible to change the focus of the incident light in the axial direction (eg, Z-axis) according to the voltage applied to the first electrode 100 and the second electrode 200 .

Referring to FIGS. 6 and 7 , focusing on the X-axis or the Y-axis in detail, the light collecting member 320 having an asymmetric shape is formed by varying the voltage of at least one of the unit electrodes 120a, 120b, 120c, and 120d. Assuming that the horizontal axis of the optical axis is the X axis, the light collecting member 320 has an inclination with respect to the X axis direction, and the incident light Lpaa is output light Lpab due to the inclination of the light collecting member 320 . Focusing on one side, the focus may be changed from F1 to F3 as shown in FIG. 6 or from F1 to F4 as shown in FIG. 7 .

In other words, by forming the light collecting member 320 having an asymmetric shape having an inclination, it is possible to change the focus along the X-axis or the Y-axis.

At this time, looking at the cross-section of the transmitting part 300, it may include a light collecting member 320 with irregularities protruding and protruding symmetrically formed on the left and right sides around the central side on the upper portion of the body of the rectangular parallelepiped shape through which light is transmitted, the light collecting member 320 is It may be formed directly on the upper portion of the rectangular parallelepiped body, and first, an auxiliary protruding surface having a predetermined radius of curvature is formed on the upper portion of the body in the direction in which light is incident, and then the light collecting member 320 is formed on the auxiliary protruding surface. may be

Due to this, the focal position of the light passing through the transmission unit 300 is changed in three dimensions, so that not only automatic focal length adjustment in the light direction but also hand shake phenomenon can be corrected.

In addition, by having a configuration of a Fresnel-type gel lens that is three-dimensionally variable to enable not only automatic focal length adjustment in the optical direction but also correction of hand shake, a three-dimensional variable focus Fresnel-type gel lens with flat electrodes is included. There is an advantage that miniaturization of electronic devices can be made possible.

The three-dimensional variable focus gel lens 10 having a planar electrode having the configuration as described above may further include an anti-distortion unit 500 .

Referring to FIG. 3 described above for the distortion prevention unit 500, the distortion prevention unit 500 distorts the shape of the transmission unit 300 by blocking the electrical interference between the plurality of unit electrodes. can play a role in preventing

Specifically, the distortion preventing unit 500 may include a first unit electrode distortion preventing unit 520 and a second unit electrode distortion preventing unit 540 , and the first electrode 100 and the second electrode 200 are It may be a predetermined area formed on the substrate so as to be spaced apart from each other at a predetermined interval, and an insulating member may be included in the predetermined area to double block interference between the unit electrodes 120 .

For example, the plurality of first unit electrodes 120a, 120b, 120c, and 120d and the plurality of second unit electrodes 220a, 220b, 220c, 220d may be arranged at predetermined intervals. A first unit electrode distortion prevention unit 520 may be formed between the unit electrodes 120a, 120b, 120c, and 120d, and the second unit electrode distortion prevention unit 540 includes a plurality of second unit electrodes 220a, 220b, 220c and 220d) may be formed.

In this case, the first unit electrode distortion prevention unit 520 is formed between the first unit electrodes 120a, 120b, 120c, and 120d such that the plurality of first unit electrodes 120a, 120b, 120c, and 120d are spaced apart by a predetermined interval. It may be an 'X'-shaped region.

Here, the 'X'-shaped region may be divided into a plurality of bar-shaped regions, and the width of one bar-shaped region is between a plurality of adjacent first unit electrodes 120a, 120b, 120c, and 120d. may be formed to be the same as the preset interval of .

In addition, the second unit electrode distortion prevention unit 540 is formed between the second unit electrodes 220a, 220b, 220c, and 220d such that the adjacent second unit electrodes 220a, 220b, 220c, and 220d are spaced apart by a predetermined interval. In the case where the first electrode wires 140a, 140b, 140c, and 140d are formed between the second unit electrodes 220a, 220b, 220c, and 220d, the above-described predetermined distance d2 is also taken into consideration. design is preferred.

Here, the predetermined interval may be the same as the width of the first unit electrode distortion prevention unit 520 and the second unit electrode distortion prevention unit 540 , and the light collecting member 320 of the transmission unit 300 has a target shape. It is preferable to design in consideration of the voltage applied to the first electrode 100 and the second electrode 200 so as to be possible, and may be designed in inverse proportion to the number of unit electrodes formed in plurality.

In addition, the preset interval may be changed according to the diameter of the light collecting member 320 protruding by the electrostatic repulsion force of the transmission part 300 .

Specifically, the predetermined interval may be 50 μm to 1000 μm, and when the interval between the plurality of electrodes is less than 50 μm, a short circuit between the plurality of electrodes occurs or electrical interference occurs and each applied individually voltage deviates from the target voltage, and thus the target shape may be deformed. As a result, the focus of the output light Lpab transmitted through the transmission unit 300 cannot be moved in a desired direction.

On the other hand, if the distance between the plurality of electrodes exceeds 1000 μm, for example, one side of the light collecting member 320 of the transmissive part 300 that is deformed corresponding to the individually applied first electrode 120a and Since a region to which no voltage is applied is formed between the other side of the light collecting member 320 of the transmissive part 300 that is deformed in response to the individually applied first electrode 120b, the transmissive part 300 has a limited range of shape deformation. do. Accordingly, the range of the focus movement of the output light Lpab transmitted through the transmission unit 300 may be limited.

By setting the interval between the plurality of first electrodes 100 to 50 μm to 1000 μm, shape distortion including distortion of the shape of the light collecting member 320 targeted by the transmission part 300 can be prevented, and accordingly There is an advantage in that it is possible to prevent an error with respect to a three-dimensional focus movement.

Due to this, by preventing shape distortion including distortion of the shape of the light collecting member 320 targeted by the transmission part 300 through the distortion prevention part 500, an error with respect to the three-dimensional focus movement can be prevented. have.

As described above, preferred embodiments according to the present invention have been described, and the fact that the present invention can be embodied in other specific forms without departing from the spirit or scope of the present invention in addition to the above-described embodiments is one of ordinary skill in the art. It is obvious to them. Therefore, the above-described embodiments are to be regarded as illustrative rather than restrictive, and accordingly, the present invention is not limited to the above description, but may be modified within the scope of the appended claims and their equivalents.

10: three-dimensional focus-variable Fresnel-type gel lens having a flat electrode
100: first electrode
200: second electrode
300: transmission part
400: substrate
500: distortion prevention unit

Claims (12)

a first electrode and a second electrode formed on the substrate and having different polarities; and
When a voltage is applied to the first electrode and the second electrode, the inclination angle of the inclined surface is provided with a light collecting member formed of an electroactive polymer and refracting light incident through the inclined surface in the form of a concavo-convex cross-section having an inclined surface. Including; a variable transmission part;
The first electrode and the second electrode are formed in plurality, and voltage is applied individually to deform the shape of the transmission part in three dimensions, whereby the focal position of the light passing through the transmission part is changed in three dimensions, The first electrode and the second electrode are characterized in that they are composed of a plurality of unit electrodes to which voltages are individually applied on the substrate,
The transmission part,
It is disposed on the upper side of the substrate so that the light collecting member is deformed when a voltage is applied, the first electrode is provided to correspond to the light collecting member of the transmissive part, and the second electrode is formed on the same plane as the first electrode, , characterized in that it is provided to partially wrap around the first electrode at a predetermined distance,
The first electrode is
A plurality of first unit electrodes having a sectoral shape having the same central angle are provided, and a first electrode lead is provided on one side of an arc formed on the first unit electrode and disposed so as to be in contact with one surface of the substrate;
The second electrode is
A plurality of second unit electrodes provided in a radial pattern surrounding one of the first unit electrodes and a part of the other adjacent to one of the first unit electrodes in a bar shape having a curvature are provided, and the second unit electrode has a second unit electrode connected to an external power source. An electrode wire is provided,
The first electrode lead is characterized in that it is disposed between the adjacent second unit electrode,
By blocking the electrical interference between the plurality of unit electrodes, further comprising a distortion preventing portion for preventing shape distortion of the transmission portion,
The distortion prevention unit,
The plurality of unit electrodes are formed to have the same width as the predetermined interval between the plurality of unit electrodes so that the plurality of unit electrodes are spaced apart from each other at a predetermined interval, and an X-shaped first unit electrode is formed between the first unit electrodes. A distortion prevention part is formed, and a second unit electrode distortion prevention part is formed between the second unit electrode and the first electrode wire,
A three-dimensional tunable Fresnel gel lens with a planar electrode. According to claim 1,
The light collecting member,
Characterized in that the cross section is provided as a ring-shaped unit lens in which irregularities having an inclined surface are continuously arranged in the circumferential direction.
A three-dimensional tunable Fresnel gel lens with planar electrodes. 3. The method of claim 2,
The unit lens is
A plurality of them are formed to have the same central axis on the same plane, characterized in that they are continuously arranged in the radial direction from the central axis
A three-dimensional tunable Fresnel gel lens with planar electrodes. 4. The method of claim 3,
The unit lens is
Characterized in that the length from the central axis to the inclined surface has a predetermined ratio
A three-dimensional tunable Fresnel gel lens with planar electrodes. delete delete According to claim 1,
The predetermined interval is,
50 μm to 1000 μm
A three-dimensional tunable Fresnel gel lens with planar electrodes. delete According to claim 1,
The predetermined distance is a distance between the first electrode and the second electrode,
Preventing short circuit between the first electrode and the second electrode
A three-dimensional tunable Fresnel gel lens with planar electrodes. 10. The method of claim 9,
The predetermined distance is a distance between the first electrode and the second electrode,
characterized in that it is set in response to a voltage in a preset range applied from the first electrode and the second electrode to the transmissive part
A three-dimensional tunable Fresnel gel lens with planar electrodes. delete According to claim 1,
The predetermined interval is a distance between a plurality of unit electrodes,
Variable according to the diameter of the protruding light collecting member
A three-dimensional tunable Fresnel gel lens with planar electrodes.

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