KR102031076B1 - Composite lens containing liquid crystal - Google Patents

Abstract

A composite lens is disclosed according to an embodiment of the present disclosure for realizing the above problems. The composite lens may include a lens unit including two or more lenses including a first lens disposed on a front surface corresponding to a subject side on the composite lens and a second lens disposed on a rear surface corresponding to a user side on the composite lens; An electroactive liquid crystal formed by filling a liquid crystal material in a space formed by the first lens and the second lens, and determining a molecular arrangement of the liquid crystal material based on an electric field formed by applying a voltage to an electrode; An electrode disposed on at least one of front and rear surfaces of an electroactive liquid crystal, and in the midpoint of the composite lens, the midpoint corresponds to a center point with respect to the optical surface of the composite lens; The distance between is different from the distance between the first lens and the second lens at the edge of the composite lens. Can.

Description

Compound lens containing liquid crystal {COMPOSITE LENS CONTAINING LIQUID CRYSTAL}

TECHNICAL FIELD The present disclosure relates to glasses and lenses, and more particularly, to glasses and lenses that provide variable focus using liquid crystals.

Presbyopia is a gradual decrease in the ability of the lens to adjust around 40 or 45 years of age. The elasticity of the lens is degraded or the lens is enlarged, which reduces the near vision range, making it difficult to see objects located near the lens. Therefore, a user with presbyopia feels tired even when reading or relaxing.

The total population of Korea is expected to decline after peaking in 2020. As a result, the ratio of over 45 years old, which was 38% in 2010, increased to 63% in 2050.

Currently, lenses commonly used for vision correction include monofocal lenses, bifocal lenses, and multifocal lenses. Among these, the short focus lens is a lens for correcting only short-range or long-distance lenses, which is inconvenient for a user to change glasses to correspond to each distance.

In addition, the bifocal lens can correct the distance and the near field. The bifocal lens can change the refractive index of a specific area of the lens so that the user can see near and far according to the position of the wearer's gaze, but since the periphery of the gaze is not corrected, the wearer can easily feel fatigue and adjust the position of the gaze. However, there is an inconvenience in that the glasses need to be fixed. In addition, the bifocal lens may be accompanied by dizziness when going down a stairs or looking at a distant place, a jump of the image may occur, and there is an appearance problem due to the boundary between the near and far parts.

Lastly, the multifocal lens is a lens including a proximal progressive part, which has less leap or dizziness than the bifocal lens, and can see near, medium and long distances with continuous refractive index changes from far to near. However, the multifocal lens has a narrow lens area with several degrees of overlap, so that the area of the progressive part and the near part is narrow, and when the side of the progressive part is distorted and astigmatized by the aberration, the blurring or shaking of the image is more severe than the bifocal lens. , It is not possible to use stable for a long time due to the narrow and unstable progressive belt used for specifying the intermediate distance, and there is a problem of being inconvenient due to the narrow field of view.

Therefore, in order to solve these problems, there is a need in the art for a composite lens capable of variably adjusting the refractive index including an electroactive liquid crystal.

In this regard, Patent Publication No. 10-2012-0033696 discloses a lens having a focal length that is adjustable by a transparent elastic film and a permanent magnet.

The present disclosure is devised in response to the above-described background, and is to provide glasses and lenses capable of varying the focus using liquid crystals.

The present disclosure is to provide glasses and lenses that can increase the focal length change amount through the nanostructures.

The present disclosure is to provide glasses and lenses that provide a variable focus while remaining one for any viewpoint.

A composite lens is disclosed according to an embodiment of the present disclosure for realizing the above problems. The composite lens may include a lens unit including two or more lenses including a first lens disposed on a front surface corresponding to a subject side on the composite lens and a second lens disposed on a rear surface corresponding to a user side on the composite lens; An electroactive liquid crystal formed by filling a liquid crystal material in a space formed by the first lens and the second lens, and determining a molecular arrangement of the liquid crystal material based on an electric field formed by applying a voltage to an electrode; An electrode disposed on at least one of front and rear surfaces of an electroactive liquid crystal, and in the midpoint of the composite lens, the midpoint corresponds to a center point with respect to the optical surface of the composite lens; The distance between is different from the distance between the first lens and the second lens at the edge of the composite lens. Can.

Alternatively, the liquid crystal material is determined to be one of one or more phase levels based on the strength of the electric field formed as a voltage is applied to the electrode, and the electric field is based on a position in the electroactive liquid crystal. Can be determined.

Alternatively, liquid crystal materials having the same distance between the position on the electroactive liquid crystal and the midpoint can be determined to have the same state level.

Alternatively, the distance between the first lens and the second lens may be determined differently based on the distance from the midpoint to the edge such that the intensity of the electric field is unbalanced on the electroactive liquid crystal.

Alternatively, the first lens is configured to have a first refractive index, the second lens is configured to have a second refractive index, and the electroactive liquid crystal is configured to have a third refractive index to the composite lens. One focal point can be formed.

Alternatively, the third refractive index may be determined by a combination of the midpoint refractive index at the midpoint and the edge refractive index at the edge, the edge refractive index being different from the midpoint refractive index.

A composite lens is disclosed according to another embodiment of the present disclosure for realizing the above problem. The composite lens may include a lens unit including two or more lenses including a first lens disposed on a front surface corresponding to a subject side on the composite lens and a second lens disposed on a rear surface corresponding to a user side on the composite lens; An electroactive liquid crystal formed by filling a liquid crystal material in a space formed by the first lens and the second lens, and determining a molecular arrangement of the liquid crystal material based on an electric field formed by applying a voltage to an electrode; It may include an electrode disposed on at least one surface of the front and rear surfaces of the electroactive liquid crystal, and including a first electrode line and a second electrode line formed in a cross structure in the insulating transparent layer.

Alternatively, the liquid crystal material is determined to be one of one or more phase levels based on the strength of the electric field formed as a voltage is applied to the electrode, and the electric field is determined by the first electrode line and the second electrode. Can be determined based on the density of the line.

Alternatively, the density of the first electrode line and the second electrode line in the midpoint of the composite lens, wherein the midpoint corresponds to a center point with respect to the optical plane of the composite lens, is the intensity of the electric field on the electroactive liquid crystal. It may be different from the density of the first electrode line and the second electrode line at the edge of the composite lens so that is unbalanced.

Alternatively, the electrode may be composed of a visually transparent material.

Alternatively, the second electrode line includes one or more break regions configured to be electrically separated from the first electrode line relative to an area crossing the first electrode line, and both ends of the break region may be It may be configured to form a step perpendicular to the advancing direction of the second electrode line, to electrically connect the second electrode line disconnected to both sides by the disconnection region.

The present disclosure can provide glasses and lenses capable of varying focus using liquid crystals.

The present disclosure can provide glasses and lenses that can increase the focal length variation through the nanostructures.

The present disclosure can provide glasses and lenses that provide a variable focus while remaining one for any viewpoint.

1 is a flow chart of a method of manufacturing a composite lens including a nanostructure according to a first embodiment of the present disclosure.
2 is a simplified manufacturing process of a stamper for forming a composite lens including a nanostructure according to a first embodiment of the present disclosure.
3 is a block diagram of a composite lens including a nanostructure according to a first embodiment of the present disclosure.
4 is a side cross-sectional view of a composite lens including a nanostructure according to the first embodiment of the present disclosure.
5 is a side cross-sectional view of a nanostructure having a Fresnel structure according to a first embodiment of the present disclosure.
6 is an enlarged view of an electrode including an electroactive region and an electrode bar according to one embodiment of the present disclosure.
7 is a schematic diagram of the molecular arrangement of an electroactive liquid crystal that changes based on an applied voltage according to an embodiment of the present disclosure.
8 is a graph of transmittance of an electroactive liquid crystal that changes based on an applied voltage according to an embodiment of the present disclosure.
9 is a block diagram of a composite lens according to a second exemplary embodiment of the present disclosure.
10 is a combination view of a composite lens showing a midpoint portion and an edge portion according to the second embodiment of the present disclosure.
11 is a side cross-sectional view of a composite lens according to a second embodiment of the present disclosure.
12 is an exemplary top view of an electrode including a first electrode line and a second electrode line in accordance with a second embodiment of the present disclosure.
13 is a cross structure of a first electrode line and a second electrode line according to the second exemplary embodiment of the present disclosure.
14 is a block diagram illustrating a composite lens including an electroactive liquid crystal according to a third exemplary embodiment of the present disclosure.
15 is a side cross-sectional view of a composite lens including two or more electroactive liquid crystals divided into intermediate layers according to a third embodiment of the present disclosure.
16 is a side cross-sectional view of a composite lens including two or more electroactive liquid crystals divided into third electrodes according to a third embodiment of the present disclosure.

Various embodiments are now described with reference to the drawings, wherein like reference numerals are used to refer to like elements throughout. In this specification, various descriptions are presented to provide an understanding of the present disclosure. It is evident, however, that such embodiments may be practiced without these specific details. In other instances, well-known structures and devices are provided in block diagram form in order to facilitate describing the embodiments.

As used herein, the terms “component”, “module”, “system” and the like refer to computer-related entities, hardware, firmware, software, a combination of software and hardware, or the execution of software. For example, a component may be, but is not limited to being, a process running on a processor, a processor, an object, an thread of execution, a program, and / or a computer. For example, both an application running on a computing device and the computing device can be a component. One or more components can reside within a processor and / or thread of execution, and a component can be localized within one computer or distributed between two or more computers. In addition, these components can execute from various computer readable media having various data structures stored thereon. The components may for example be signals having one or more data packets (e.g., data from one component interacting with another component in a local system, distributed system, and / or data over a network such as another system and the internet via signals and / or signals May communicate via local and / or remote processes.

The description of the presented embodiments is provided to enable any person skilled in the art to make or use the present disclosure. Various modifications to these embodiments will be apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the scope of the present disclosure. Thus, the present disclosure should not be limited to the embodiments presented herein but should be construed in the broadest scope consistent with the principles and novel features presented herein.

Hereinafter, terms used in the present specification are defined.

In the present specification, the lens lens may refer to a refractive or diffractive structure that converges or diverges light. In addition, each lens is composed of both surfaces, each surface may be configured in the form of at least one of concave, convex and planar. In addition, the lens may be composed of a spherical shape, a cylindrical shape, a rectangular shape or a combination thereof. The lens may be composed of at least one of an optical glass, a plastic, a thermoplastic resin, a thermosetting resin, a glass, a composite polymer of a resin, and may be composed of a combination of two or more of the respective materials. The description of the material of the aforementioned lens is only an example, and the present disclosure is not limited thereto.

In the present specification, the front may refer to a direction in which a user looks at the composite lens, and the rear of the lens may refer to a direction in which the eyeball of the user is positioned based on the composite lens. In addition, the midpoint may refer to a point centered with respect to the optical surface of the compound lens. In addition, an edge may refer to an outer shell located far from the midpoint of the composite lens.

1 is a flow chart of a method of manufacturing a composite lens including a nanostructure according to a first embodiment of the present disclosure.

First, according to an embodiment of the present disclosure, the nanostructure 300 may be synthesized through hydrothermal synthesis to favor large area synthesis at low temperature. Here, hydrothermal synthesis is a method of synthesizing a substance using water or an aqueous solution at a relatively low temperature (80 to 90) and atmospheric pressure, and a metal salt, oxide, hydrate, or metal powder is a solvent substance in a solution in a solution state or suspension state. It can refer to a method of growing or synthesizing a crystal of a material by changing the concentration, temperature, pressure, and the like. Accordingly, hydrothermal synthesis is simple in manufacturing process, good recovery factor, and relatively inexpensive, unlike vapor-phase synthesis including VLS (Vapor-Liquid-Solid) and VS (Vapor-Solid). Raw materials can be used to mass produce high purity materials. Synthesis of the nanostructure 300 of the present disclosure may be performed through liquid phase synthesis such as electrochemical or sonochemical in addition to the hydrothermal synthesis described above.

In addition, hydrothermal synthesis may include hydrothermal crystallization, precipitation, hydrothermal reaction, hydrothermal decomposition, and hydrothermal oxidation, depending on the growth method. More specifically, the hydrothermal crystallization method induces the crystallization by inducing amorphous or low crystalline precipitation through the hot water in the solution, and the precipitation method determines the crystalline crystal by hydrolysis or neutralization of alcohol groups or salts in the solution under hydrothermal conditions. The hydrothermal reaction method is a method of chemically reacting a solvent or a solid and a solution component under hydrothermal conditions to obtain a new product depending on the reactant. The hydrothermal decomposition method can obtain an effective compound through decomposition of a compound under hydrothermal conditions. Each method may mean a method, and finally, the hydrothermal oxidation method may refer to a method of directly oxidizing a metal or the like with water of high temperature and high pressure to obtain crystals from an oxide formed.

)와 Hexamethylenetetramine(HMTA,

)을 1:1 비율로 혼합하여 제조되는 합성 용액을 사용할 수 있다. 하지만, 전술한 용액의 기재는 예시일뿐, Hexamethylenetetramine 외에도 NaOH,

등이 수산화물(hydroxide) 재료로써 사용될 수 있음이 당업계에 공지되어 있어, 본 개시는 이에 제한되지 않는다.The solution used in hydrothermal synthesis may be used as a medium for transferring heat and pressure in hydrothermal synthesis. In addition, the solution may optionally play several roles such as reactants, solvents, surface adsorbents, catalysts, etc., and may facilitate chemical reactions and crystallization, and may act as reaction solvents and various roles as erosion and solidification agents in ion exchange or extraction. have. Solution according to an embodiment of the present disclosure is Zinc nitrate Hexahydrate (

) And Hexamethylenetetramine (HMTA,

) Can be used a synthetic solution prepared by mixing in a 1: 1 ratio. However, the description of the above-described solution is only an example, in addition to Hexamethylenetetramine, NaOH,

It is known in the art that etc. can be used as a hydroxide material, and the present disclosure is not limited thereto.

The method for manufacturing the composite lens 1000 according to the first embodiment comprises the step of immersing the substrate 200 in a synthetic aqueous solution of a predetermined concentration composed of transition metal hydrate and hexamethylenetetramine (101). can do. Here, the substrate 200 may cut the PET fabric as in a method generally used in hydrothermal synthesis, and provide a gold thin film on the fabric as a seed layer.

In addition, the transition metal hydrate according to an embodiment of the present disclosure may include at least one transition metal element of zinc (Zn) and ruthenium (Ru). More specifically, the nanostructure 300 according to an embodiment of the present disclosure may be formed by oxidizing the transition metal element included in the transition metal hydrate and depositing it on a substrate. In addition, the transition metal element may include at least one of zinc (Zn) and ruthenium (Ru). Preferably, the transition metal element included in the transition metal hydrate may include zinc (Zn).

In addition, the synthetic aqueous solution of a predetermined concentration according to an embodiment of the present disclosure is composed of 15% zinc nitrate hexahydrate (Aldrich) and 95% or more of hexamethylenetetramine (Aldrich) is mixed with 15mM Can be. According to one embodiment, the synthetic aqueous solution of the predetermined concentration may be composed of 15mM by mixing 98% zinc nitrate hydrate and 99% hexamethylenetetramine. Accordingly, the substrate 200 for synthesizing the nanostructure 300 may be immersed in a 15mM synthetic aqueous solution in which 95% or more zinc nitrate hydrate and 95% or more hexamethylenetetramine are mixed.

The method for manufacturing the composite lens 1000 according to the first exemplary embodiment includes storing the substrate 200 in a synthetic aqueous solution to grow the nanostructure 300, and storing the composite lens 1000 at a predetermined temperature for a preset time. 102 may be included. In a condition of immersing the substrate 200 in the synthetic aqueous solution, a preset time may be 10 hours or more, and the preset temperature may be 75 ° C to 85 ° C. More preferably, the substrate 200 may be immersed in the synthetic aqueous solution for 14 hours and then stored in an oven at 80 degrees.

The method for manufacturing the composite lens 1000 according to the first embodiment may include a step 103 of passing the substrate in a synthetic aqueous solution. As described above, the nanostructure 300 (eg, zinc oxide in the form of nanowires) may be synthesized on the substrate 200 through the above-described processes 101, 102, and 103. In addition, the nanostructure 300 according to an embodiment of the present disclosure may be arranged in an arbitrary pattern by being synthesized only in a designated region through patterning on the substrate 200.

A method for manufacturing the composite lens 1000 according to the first embodiment of the present disclosure, in order to etch the nanostructure 300 in any form, the substrate 200 is pre-set in an aqueous solution of hydrochloric acid (HCl) at a predetermined pH. It may further comprise the step of immersing for a predetermined time and the step of drying the substrate 200 in the hydrochloric acid aqueous solution.

More specifically, the method for manufacturing the composite lens 1000 according to an embodiment of the present disclosure through the synthesis step (101, 102 and 103) of the nanostructures described above (for example, in the form of nanowires) The method may further include etching the zinc oxide) into any shape desired by the user (eg, zinc oxide in the form of nanocone). The aqueous hydrochloric acid solution at a preset pH may be an aqueous hydrochloric acid solution having a pH of 1.7 to 2.3, and the preset time may be 5 seconds to 15 seconds. More preferably, the substrate 200 including the nanostructures 300 may be immersed in an aqueous hydrochloric acid (HCL) solution having a pH of 2.0 at room temperature for 10 seconds. In addition, the substrate 200 may be obtained by passing the substrate 200 in an aqueous hydrochloric acid solution after a preset time, in which the nanostructure 300 is processed to a desired shape.

In addition, the method for manufacturing the composite lens 1000 according to an embodiment of the present disclosure, after the step of drying the substrate 200 in an aqueous hydrochloric acid solution, the substrate 200 is cleaned with DI water (Deionized water) at room temperature And it may further comprise the step of drying with air. For example, the method of manufacturing the composite lens 1000 may further include washing the dry substrate 200 in DI aqueous solution for 30 minutes with DI water and drying with air. Specific numerical values or descriptions of the above-described washing and drying steps are exemplary only, and the present disclosure is not limited thereto.

The method for manufacturing the composite lens 1000 according to the first embodiment may include generating 104 a stamper by duplicating a substrate 200 including the nanostructure 300 into a master mask. Can be. In this case, the master mask may mean a shape that serves as a reference for performing replication using imprinting.

Replicating the substrate 200 including the nanostructure 300 according to an embodiment of the present disclosure with a master mask to generate a stamper 700 includes applying a curable resin onto the substrate 200. And curing the curable resin to generate the nanostructure 300 and the first replica 400 in the mirror form, and the same shape as the nanostructure 300 and the metallic material based on the first replica 400. Generating a second replica 500 and attaching the second replica 500 to the mold 600. A detailed description of the step of generating the stamper 700 by duplicating the substrate 200 will be described later with reference to FIG. 2.

In the method for manufacturing the composite lens 1000 according to the first embodiment, the nanostructure 300 is formed on at least one surface of at least one of the first lens 1100 and the second lens 1200 by using the stamper 700. Step 105). The stamper 700 may include a second replica 500 and a mold 600 having the same shape as the nanostructure 300. In addition, the stamper 700 is located on one side of a cavity (not shown) for manufacturing the first lens 1100 and the second lens 1200, and the shape of the nanostructure 300 is a resin introduced into the cavity. Can be transferred. Additionally, the nanostructure 300 according to an embodiment of the present disclosure may be synthesized on the substrate 200, and then changed in form or arrangement through functionalization (etching, orientation by electrical interlocking, etc.).

In addition, the method for manufacturing the composite lens 1000 according to the first embodiment includes one of the first lens 1100 and the second lens 1200 as an insert member to cover the nanostructure 300. Insert molding the lens. The other lens may be a lens that is not an insert member among the first lens 1100 and the second lens 1200. More specifically, one lens (eg, a second lens) may be formed by injecting and curing a curable resin into a cavity (not shown). The cavity may include a stamper 700 on one side to transfer the nanostructure 300 to the lens. After the one lens is disposed as an insert member, the other lens (eg, the first lens) may be formed by insert molding. In addition, according to another embodiment of the present disclosure, both the first lens 1100 and the second lens 1200 may include the nanostructure 300.

The method for manufacturing the composite lens 1000 according to the first embodiment may include injecting a liquid crystal material 107 between the first lens 1100 and the second lens 1200. More specifically, the first lens 1100 and the second lens 1200 may be insert molded to be spaced apart by a predetermined distance. In addition, an electroactive liquid crystal 1400 may be formed by injecting a liquid crystal material into a space between the first lens 1100 and the second lens 1200. Herein, the liquid crystal material may include an organic compound having a crystallographic orientation and having optical anisotropy. In addition, the electroactive liquid crystal 1400 is a cholesteric type in which the molecular layers are stacked in a planar shape, a smectic type in which the molecular layers are stacked in the long axis direction, and a nema in which the long axes of the molecules are arranged in parallel with each other. It can be configured as one of the nematic (Nematic) type. Detailed description of the driving of the electroactive liquid crystal 1400 will be described later with reference to FIGS. 7 and 8.

Accordingly, the composite lens 1000 according to the first exemplary embodiment may maximize the amount of change in focal length based on the curvature of the lens and the liquid crystal through the nanostructure 1210. In other words, the thickness of the lens required to change the same focal length can be reduced, improving the aesthetics in appearance and reducing the weight, thereby increasing user convenience. In addition, the thinning of the electroactive liquid crystal 1400 may reduce the driving voltage and chromatic aberration.

In addition, the user can adjust the lens to the desired focal length by simply touching the compound lens or moving the head, which is more convenient than the existing single-focal lens, and it is laterally distorted by the distortion and astigmatism generated by the progressive multifocal lens. Poems can be prevented from blurring or shaking. In addition, by maintaining a single focus at one viewpoint, a wide field of view can be stably provided to the user.

2 is a schematic view illustrating a manufacturing process of a stamper 700 for forming a composite lens 1000 including a nanostructure 300 according to a first embodiment of the present disclosure.

First, the method for forming the composite lens 1000 according to the first embodiment may include synthesizing the nanostructure 300 on the substrate 200. A detailed description of the synthesis of the nanostructure 300 is described above with reference to FIG. 1.

In addition, the step 104 of replicating the substrate 200 including the nanostructure 300 according to an embodiment of the present disclosure with a master mask to generate a stamper 700 may include a curable resin on the substrate 200. The step of applying, curing the curable resin to produce a nanostructure 300 and the first replica 400 of the mirror form, the same shape as the nanostructure 300 based on the first replica 400 The method may include generating a second replica 500 made of a metal material and attaching the second replica 500 to the mold 600.

Generating the stamper 700 according to an embodiment of the present disclosure 104 may include applying a curable resin on the substrate 200. Here, the curable resin may include a low viscosity curable material based on monomers. For example, the curable resin may include a low viscosity curable resin used in an imprinting process such as an aliphatic epoxy resin, a bicyclic resin, and a glycidyl ester resin. Accordingly, the transferability of the arrangement and the shape of the nanostructure 300 is directed, so that the variable range of the focal point can be extended, and complex functions such as contamination prevention and antireflection functions on the lens surface can be provided. The base material of curable resin mentioned above is an illustration only, and this indication is not limited to this.

Generating the stamper 700 according to an embodiment of the present disclosure 104 may include curing the curable resin to generate the nanostructure 300 and the first replica 400 in mirror form. More specifically, the curable resin applied on the substrate 200 may be cured through imprinting. Here, the imprinting method may be performed by one of a photocuring method and a hot embossing method according to the properties of the material used as the curable resin. Then, by separating the cured resin from the substrate 200, it is possible to generate a first replica 400 that is mirror image of the substrate 200.

In addition, the step 104 of generating the stamper 700 according to an embodiment of the present disclosure is based on the first replica 400, the second replica 500 having the same shape as the nanostructure 300 and made of a metallic material. It may include the step of generating. More specifically, a physical thin film made of a metal material may be formed on the first replica 400 through physical vapor deposition (PVD). The metal material may be a metal element such as nickel (Ni), copper (Cu), tungsten (W), silicon (Si), niobium (Nb), or an alloy composed of a combination of the metal elements. In addition, the PVD may include all techniques for fabricating thin films by physical principles such as evaporation, sputtering, ion plating, and the like. The above-listed PVD scheme is merely an example, and the present disclosure is not limited thereto. Accordingly, the second replica 500 having the same shape as that of the nanostructure 300 on the first replica 400 and the substrate 200 may be generated.

Generating the stamper 700 according to one embodiment of the present disclosure 104 may include attaching the second replica 500 to the mold. The stamper 700 may include a second replica 500 and a mold 600 having the same shape as the nanostructure 300. In addition, the stamper 700 is located on one side of a cavity (not shown) for manufacturing the first lens 1100 and the second lens 1200, and the shape of the nanostructure 300 is a resin introduced into the cavity. Can be transferred. That is, the stamper 700 may be formed of the same shape as that of the nanostructure 300, and may be made of a more strengthened material. And, accordingly, the stamper 700 according to the exemplary embodiment of the present disclosure may be much more reusable and durable than the method of directly attaching the nanostructure 300 to the lens, and additional replication may be easily performed.

3 is a block diagram of a composite lens 1000 including a nanostructure 1210 according to a first embodiment of the present disclosure.

The composite lens 1000 including the nanostructure 1210 according to the first embodiment of the present disclosure includes a first lens 1100, a second lens 1200, an electroactive liquid crystal 1400, and an electrode 1500. can do. In addition, according to an embodiment of the present disclosure, the composite lens 1000 may further include a user input unit 1600, a sensor unit 1700, a power supply unit 1800, and a frame 1900.

The first lens 1100 according to the exemplary embodiment of the present disclosure may be configured to have a first refractive index. In addition, the second lens 1200 may be configured to have a second refractive index. Here, the refractive index may mean a rate at which the luminous flux decreases when light proceeds to a transparent medium. In addition, the first lens 1100 may have a first refractive power, and the second lens 1200 may be configured to have a second refractive power. Here, the refractive power refers to a force for changing the direction of light and may use a diopter unit. The refractive power of the first lens 1100 and the second lens 1200 may be summed to form the refractive power of the composite lens 1000.

In addition, the first lens 1100 and the second lens 1200 according to the exemplary embodiment of the present disclosure may be configured as at least one of a concave lens, a convex lens, and an aspherical lens, respectively. In addition, according to an embodiment, the first lens 1100 and the second lens 1200 may be configured in a complementary structure to suppress aberration. The shapes of the first lens 1100 and the second lens 1200 described above are merely examples, and the present disclosure is not limited thereto.

In addition, one side of each of the first lens 1100 and the second lens 1200 may be disposed in contact with the electroactive liquid crystal 1400. More specifically, the first lens 1100 and the second lens may be spaced apart from each other, and the liquid crystal material may be filled therebetween to form the electroactive liquid crystal 1400. Accordingly, the electroactive liquid crystal 1400 may be configured to have a third refractive index that is variable based on the molecular arrangement of the liquid crystal.

In addition, the second lens 1200 may include a nanostructure 1210 disposed on at least one surface and configured to increase an amount of change in focal length of the composite lens. The nanostructure 1210 may be synthesized by the method described above with reference to FIGS. 1 and 2. In addition, the nanostructure 1210 may have any shape desired by the user (eg, zinc oxide in the form of a nano-cone, or zinc oxide in the form of a nanowire).

Nanostructures 1210 according to an embodiment of the present disclosure may be arranged in any pattern desired by the user. For example, individual nanostructures 1210 composed of zinc oxide in the form of nanocones may be disposed on the rear surface of the second lens 1200 in a pattern of a Fresnel lens. Accordingly, the nanostructure 1210 may dramatically improve the change in refractive index caused by the electroactive liquid crystal 1400 in the composite lens 1000. And through this, it is possible to reduce the thickness of the composite lens 1000 to lighten the weight, improve the aesthetics. In addition, the nanostructure 1210 may reduce the reflection of light so that the user can see the object more clearly, while preventing the haze (Haze) caused by the patterning of the micro unit.

The electroactive liquid crystal 1400 may be disposed between the first lens 1100 and the second lens 1200 and configured to have a third refractive index determined based on an applied voltage. More specifically, the electroactive liquid crystal 1400 may be accommodated between the first lens 1100 and the second lens 1200. In addition, the electroactive liquid crystal 1400 may receive a voltage from an electrode 1500 disposed between the first lens 1100 and the second lens 1200. In addition, the electroactive liquid crystal 1400 may be configured such that an arrangement of molecules included in the liquid crystal material is changed by an applied voltage. Accordingly, the electroactive liquid crystal 1400 may allow the refractive index of the light passing through the electroactive liquid crystal 1400 to be changed based on the applied voltage, thereby variably adjusting the focus of the composite lens 1000. Therefore, the composite lens 1000 according to the first exemplary embodiment of the present disclosure can provide a variable focus, so that the user can be conveniently used without being influenced by appearance and without having to change glasses.

In addition, the electroactive liquid crystal 1400 may be disposed to cover all portions except edges of the first lens 1100 and the second lens. More specifically, the electroactive liquid crystal 1400 may be configured to cover a portion of the optical surface of the first lens 1100 and the optical surface of the second lens 1200 from a midpoint at a predetermined distance. Can be. That is, in the composite lens 1000 according to the exemplary embodiment of the present disclosure, a majority of the light passing through the first lens 1100 passes through both the electroactive liquid crystal 1400 and the second lens 1200 to be concentrated in focus. Can be configured.

The electroactive liquid crystal 1400 according to an exemplary embodiment of the present disclosure may include at least one of nematic liquid crystal, smectic liquid crystal, ferroelectric liquid crystal, chiral liquid crystal, and cholesteric liquid crystal. In addition, the electroactive liquid crystal 1400 may be composed of a combination of two or more of the above-described liquid crystals. The above description of various liquid crystal types is merely an example, and the present disclosure is not limited thereto.

The electrode 1500 may be disposed on at least one surface of the front and rear surfaces of the electroactive liquid crystal 1400 and configured to apply a voltage to the electroactive liquid crystal 1400. More specifically, the electrode 1500 is disposed on at least one side of the front and rear of the electroactive liquid crystal 1400, so that the voltage in the thickness direction of the electroactive liquid crystal 1400 (that is, the thickness direction of the composite lens 1000). It can be configured to apply. In addition, the electrode 1500 may be formed of a material that transmits light and is electrically conductive (eg, an indium tin oxide (ITO) thin film).

The electrode 1500 according to an exemplary embodiment of the present disclosure may include an electrically active region 1510 formed of at least one closed curve and an electrode bar 1530 disposed adjacent to apply a voltage to the electrically active region 1510. have. Detailed description of the electrode 1500 will be described later with reference to FIG. 6.

In addition, the first lens 1100, the second lens 1200, and the electroactive liquid crystal 1400 may be configured to form one focal point on each optical surface. More specifically, the first lens 1100 and the second lens 1200 may be formed of a surface having a size of 50 to 100mm, respectively. In addition, the first lens 1100 and the second lens 1200 may have a predetermined curvature on the front and rear surfaces, respectively, to provide comprehensive refractive power of the composite lens 1000. In addition, the electroactive liquid crystal 1400 may provide the composite lens 1000 with refractive power that is variable based on the arrangement of liquid crystal molecules. In addition, the first lens 1100, the second lens, and the electroactive liquid crystal 1400 may be configured to form one focus point at which light is focused based on each optical surface.

Additionally, the composite lens 1000 according to the exemplary embodiment of the present disclosure may include a user input unit 1600 for changing the focal length based on the distance of the object to be viewed by the user. The user input unit 1600 may be located at one side (eg, the right eyeglass leg) of the frame 1900 according to an embodiment. In addition, the user input unit 1600 may include a push button, a touch sensor, or the like, and may include any means for sensing a user's input. Accordingly, the user input unit 1600 may generate a signal for adjusting the voltage applied to the electrode 1500 based on the user input. The above-described configuration and location description of the user input unit is merely an example, and the present disclosure is not limited thereto.

In addition, the composite lens 1000 according to the exemplary embodiment of the present disclosure may include a sensor unit 1700 for determining a posture of bowing down to look at an object located near by the user. Here, the sensor unit 1700 is located at one point of the frame 1900 (for example, between the first lens and the second lens) to detect gravity acceleration or to recognize the user's head movement so that the user may stare at near distance. Can be recognized. The sensor unit 1700 may generate a signal for adjusting the voltage applied to the electrode 1500 based on the determination. The signal for adjusting the voltage may be a signal for turning on the power of the composite lens 1000 or a signal for increasing a voltage applied through the electrode 1500.

Accordingly, the electrode 1500 may receive a signal for changing the focal length from the user input unit 1600 or the sensor unit 1700. The electrode 1500 may adjust the focal length of the composite lens 1000 or turn on / off the power by adjusting the voltage applied to the electroactive liquid crystal 1400 based on the input. In addition, when there is no signal from the user input unit 1600 and the sensor unit 1700, the electrode 1500 may determine that the user is staring at a long distance and change or maintain the power to Off. Accordingly, a voltage may be applied to the electrode 1500 only when a user desires (for example, near vision), thereby reducing power consumption of the composite lens 1000 and extending usage time.

Additionally, the composite lens 1000 according to the exemplary embodiment of the present disclosure may provide an automatic mode for adjusting the focus distance based on the head angle of the user recognized by the sensor unit 1700. The automatic mode may be started by receiving an input from the user input unit 1600 or through a predetermined movement (eg, shaking the head twice from side to side).

In addition, the composite lens 1000 according to the exemplary embodiment of the present disclosure may receive a voltage from the power supply unit 1800 embedded in one side of the frame 1900. The power supply unit 1800 may be configured of a small battery (eg, a small mercury battery and a rechargeable battery), and may apply a voltage to the electrode 1500 based on a user input. In addition, the power supply 1800 may include an AC voltage or a square wave to the electroactive liquid crystal 1400 by including a light circuit connected to the frame 1900 and the electrode 1500.

Accordingly, the composite lens 1000 according to the first exemplary embodiment may maximize the amount of change in focal length based on the curvature of the lens and the liquid crystal through the nanostructure 1210. In other words, the thickness of the lens required to change the same focal length can be reduced, improving the aesthetics in appearance and reducing the weight, thereby increasing user convenience. In addition, the thinning of the electroactive liquid crystal 1400 may reduce the driving voltage and chromatic aberration.

In addition, the user can adjust the lens to the desired focal length by simply touching the compound lens or moving the head, which is more convenient than the existing single-focal lens, and it is laterally distorted by the distortion and astigmatism generated by the progressive multifocal lens. Poems can be prevented from blurring or shaking. In addition, by maintaining a single focus at one viewpoint, a wide field of view can be stably provided to the user.

4 is a side cross-sectional view of the composite lens 1000 including the nanostructure 1210 according to the first embodiment of the present disclosure.

4 is a side cross-sectional view of a state in which no voltage is applied to the composite lens 1000 including the nanostructure 1210 according to the first embodiment of the present disclosure.

The composite lens 1000 may be arranged in the order of the first lens 1100, the electroactive liquid crystal 1400, and the second lens 1200, and may include an electrode 1500 disposed between the respective components. . In addition, one surface of the second lens 1200 may include a nanostructure 1210. In FIG. 4, the nanostructure 1210 is drawn largely for clarity, but may not be visually identified. In addition, although FIG. 4 illustrates that the first lens 1100 and the second lens 1200 are in contact with each other to accommodate the electroactive liquid crystal 1400, the electroactive liquid crystal 1400 may be sealed through a separate configuration. It may be.

The first lens 1100 according to the exemplary embodiment of the present disclosure may be disposed on the front surface corresponding to the subject side on the compound lens 1000. The first lens 1100 may be configured to have a first refractive index. In addition, the second lens 1200 may be disposed on the rear surface corresponding to the user side on the composite lens 1000. In addition, the second lens 1200 may be configured to have a second refractive index different from the first refractive index.

In FIG. 5, the electroactive liquid crystal 1400 may be aligned without distortion because the voltage is not applied due to the electrode 1500. That is, liquid crystal molecules included in the electroactive liquid crystal 1400 may be arranged in the thickness direction of the electroactive liquid crystal 1400. Accordingly, the light passing through the first lens 1100 may not be significantly affected. As such, the composite lens 1000 according to an exemplary embodiment does not apply a voltage to the electroactive liquid crystal 1400 when an additional refractive index is not required, such as when the user gazes at a long distance or a medium distance. Only refractive indexes of the first lens 1100 and the second lens 1200 may be provided.

In addition, the composite lens 1000 according to the exemplary embodiment of the present disclosure may include one or more third lenses 1300 disposed between the first lens 1100 and the second lens 1200 and individually having a refractive index. can do. Here, the third lens 1300 may be composed of one or more and may have an individual refractive index.

Accordingly, the composite lens 1000 according to the first exemplary embodiment may maximize the amount of change in focal length based on the curvature of the lens and the liquid crystal through the nanostructure 1210. In other words, the thickness of the lens required to change the same focal length can be reduced, improving the aesthetics in appearance and reducing the weight, thereby increasing user convenience. In addition, the thinning of the electroactive liquid crystal 1400 may reduce the driving voltage and chromatic aberration.

In addition, the user can adjust the lens to the desired focal length by simply touching the compound lens or moving the head, which is more convenient than the existing single-focal lens, and it is laterally distorted by the distortion and astigmatism generated by the progressive multifocal lens. Poems can be prevented from blurring or shaking. In addition, by maintaining a single focus at one viewpoint, a wide field of view can be stably provided to the user.

5 is a side cross-sectional view of a nanostructure having a Fresnel structure according to a first embodiment of the present disclosure.

5 is a side cross-sectional view of a state in which a voltage is applied to the composite lens 1000 including the nanostructure 1210 according to the first embodiment of the present disclosure.

The second lens 1200 included in the composite lens 1000 may include a nanostructure 1210 disposed on at least one surface. Here, as shown in FIG. 5, the nanostructure 1210 may be arranged in a Fresnel pattern to increase an amount of change in focal length of the composite lens 1000.

More specifically, as described above with reference to FIG. 2, the nanostructure 1210 may be transferred to the second lens 1200 through the completed stamper 700. In addition, the nanostructure 1210 may be disposed in any pattern desired by the user (eg, Fresnel pattern) through the stamper 700. In addition, the liquid crystal molecules are rubbed to be arranged in the thickness direction of the electroactive liquid crystal 1400 such that the refractive index of the electroactive liquid crystal 1400 may match the refractive index of the Fresnel lens composed of the nanostructure 1210. In this case, the light may go straight since there is no difference between the refractive index of the liquid crystal layer and the refractive index value of the Fresnel lens. On the other hand, when a voltage is applied to the electroactive liquid crystal 1400 through the electrode 1500, the liquid crystal molecules are rotated and arranged perpendicular to the electric field direction, so that the refractive index value of the electroactive liquid crystal 1400 and the refractive index value of the Fresnel lens This may be different. Accordingly, light may be refracted at the boundary between the electroactive liquid crystal 1400 and the second lens 1200 to form a focal point.

The nanostructure 1210 according to an embodiment of the present disclosure may be configured such that the arrangement is determined based on a voltage applied through the electrode 1500. More specifically, the nanostructure 1210 may be arranged in an orientation or a pattern set by the user in a direction set by the user through functionalization (etching and electrical interlocking). In addition, according to another exemplary embodiment, the nanostructure 1210 may be arranged in a manner of dividing the growth regions by patterning the substrate 200 before processing.

Accordingly, the composite lens 1000 according to the first exemplary embodiment may maximize the amount of change in focal length based on the curvature of the lens and the liquid crystal through the nanostructure 1210. In other words, the thickness of the lens required to change the same focal length can be reduced, improving the aesthetics in appearance and reducing the weight, thereby increasing user convenience. In addition, the thinning of the electroactive liquid crystal 1400 may reduce the driving voltage and chromatic aberration.

In addition, the user can adjust the lens to the desired focal length by simply touching the compound lens or moving the head, which is much more convenient than the existing single-focal lens. Poems can be prevented from blurring or shaking. In addition, by maintaining a single focus at one viewpoint, a wide field of view can be stably provided to the user.

6 is an enlarged view of an electrode 1500 including an electrically active region 1510 and an electrode bar 1530, according to one embodiment of the disclosure.

An electrode 1500 according to an embodiment of the present disclosure may include an electrically active region 1510 and an electrode bar 1530. The electrically active region 1510 may be disposed adjacent to the second lens 1200, and may be disposed in a preset pattern (eg, a binary Fresnel zone plate pattern in which a ring having the same center is radially disposed). In addition, the electrode bars 1530 may be disposed to be adjacent to the one or more electrically active regions 1510 and may be configured in a number corresponding to the one or more electrically active regions 1510. That is, one electrode bar 1530 is configured to be adjacent to one electroactive region 1510 to apply a voltage to the corresponding electroactive region 1510. Each electrically active region 1510 may be shunted to have the same voltage. Accordingly, the total voltage applied by the electrode 1500 to the electroactive liquid crystal 1400 may be determined based on the number of electrode bars 1530 applying a voltage to the electroactive region 1510.

For example, as shown in FIG. 6, the electrically active region 1510 may be disposed adjacent to the second lens 1200 in a binary Fresnel zone plate pattern. In addition, the structure may include four electrically active regions 1510 and four electrode bars 1530 may be separately disposed adjacent to the electrically active regions 1510. Here, each electrically active region 1510 is separated by a predetermined interval (eg, 1 μm) to maintain electrical insulation between the electrodes. In addition, the insulation between the electrically active region 1510 and the electrode bar 1530 is performed using a thin SiO 2 layer and can be electrically connected only where electrical contact is required. The detailed description of the detailed structure of the electrode 1500 is merely an example, and the present disclosure is not limited thereto.

In addition, in the electroactive liquid crystal 1400 according to the exemplary embodiment of the present disclosure, one or more state levels may be determined based on a voltage applied to the electroactive region 1510 through the electrode bar 1530. The number of state levels may be configured to correspond to the number of electrically active regions 1510, respectively. More specifically, the total voltage applied by the electrode 1500 to the electroactive liquid crystal 1400 may be determined based on the number applied to the electroactive region 1510 through the electrode bar 1530. The direction in which the respective liquid crystal molecules included in the electroactive liquid crystal 1400 are arranged may be adjusted based on the number of the electroactive regions 1510 to which the voltage is applied. For example, when voltages are applied to all four electroactive regions 1510 by the four electrode bars 1530, voltages are applied to only one electroactive region 1510 by the one electrode bar 1530. An overall voltage about four times higher than when applied can be applied. Accordingly, the liquid crystal molecules may be rotated about four times more than the case where a voltage is applied to one electroactive region 1510. The description of the number of the electrode bars 1530 and the movement of the liquid crystal molecules described above is merely an example, and the present disclosure is not limited thereto.

7 is a schematic diagram of the molecular arrangement of an electroactive liquid crystal that changes based on an applied voltage according to an embodiment of the present disclosure.

The electroactive liquid crystal 1400 according to an exemplary embodiment of the present disclosure may be a cholesteric liquid crystal in which molecular layers are stacked in a planar shape. The cholesteric liquid crystal may be determined as one of a planar state, a homeotropic state, and a focal conic state by changing the orientation of the liquid crystal molecules based on the applied voltage. More specifically, the liquid crystal material included in the electroactive liquid crystal 1400 may change into a homeotropic state when a high voltage of more than a threshold voltage is applied. When the voltage applied to the electroactive liquid crystal 1400 is lowered again, the planar state may be changed. In addition, when a voltage within a predetermined period is applied to the electroactive liquid crystal 1400, it may be determined as a focal conic state. That is, the electroactive liquid crystal 1400 may be determined as one of a homeotropic state, a planar state, and a focal conic state based on the applied voltage. The optically active liquid crystal 1400 may change optical characteristics such as transmittance and reflectance based on a state.

The focal conic and planner states described above are stable states that may exist simultaneously when no drive signal is applied to the electroactive liquid crystal 1400. Further, the electroactive liquid crystal 1400 may be in a stable state in which different domains of liquid crystal material are present in each of the focal conic state and the planner state, respectively. In this case, the total reflectance of the liquid crystal material can be determined based on the amount of liquid crystal in the focal conic state and the amount of liquid crystal in the planar state, respectively. On the other hand, the homeotropic state is an unstable state, and may be relaxed to a stable state (for example, a planar state) when the application of the voltage to the electroactive liquid crystal 1400 is stopped or when the applied voltage falls below a threshold voltage. .

8 is a graph of transmittance of an electroactive liquid crystal that changes based on an applied voltage according to an embodiment of the present disclosure.

The electroactive liquid crystal 1400 according to the exemplary embodiment of the present disclosure may have a high transmittance for light incident in the planar state. In addition, when the electroactive liquid crystal 1400 directly lowers the applied voltage to 0 V in the homeotropic state, the active liquid crystal 1400 may change into a planar state. Accordingly, when the user gazes at a long-range or medium-distance object, the electroactive liquid crystal 1400 does not apply a voltage to the electroactive liquid crystal 1400 from the electrode 1500, thereby reducing the transmittance of the electroactive liquid crystal 1400. Can be kept high. In addition, the electroactive liquid crystal 1400 may selectively reflect the bandwidth of incident light. The wavelength λ of the reflected light can be given by Bragg's law, ie by λ = nP. Is the wavelength of the reflected light, n is the refractive index of the liquid crystal material seen by the light, and P is the pitch length of the liquid crystal material.

In addition, the electroactive liquid crystal 1400 according to the exemplary embodiment of the present disclosure may have a low transmittance for light incident in the focal conic state. In addition, when the electroactive liquid crystal 1400 slowly lowers the applied voltage in the homeotropic state, the electroactive liquid crystal 1400 may change to a focal conic state. That is, the electroactive liquid crystal 1400 may maintain a non-uniform arrangement such that light incident by the liquid crystal molecules is scattered in the focal conic state.

In addition, the electroactive liquid crystal 1400 according to an exemplary embodiment of the present disclosure may have a much higher transmittance in the homeotropic state than in the focal conic state. More specifically, when the electrode 1500 applies a voltage higher than a threshold voltage (eg, 8V) to the electroactive liquid crystal 1400, the liquid crystal molecules included in the electroactive liquid crystal 1400 may be formed of the electroactive liquid crystal 1400. It may be arranged in the thickness direction, that is, the electric field direction. Accordingly, the electroactive liquid crystal 1400 may determine the arrangement of the liquid crystal molecules in one of the planner, focal conic, and homeotropic states. In addition, the electroactive liquid crystal 1400 according to the exemplary embodiment of the present disclosure may adjust the state of the electroactive liquid crystal 1400 based on the voltage applied from the electrode 1500.

Accordingly, the composite lens 1000 according to the first exemplary embodiment may maximize the amount of change in focal length based on the curvature of the lens and the liquid crystal through the nanostructure 1210. In other words, the thickness of the lens required to change the same focal length can be reduced, improving the aesthetics in appearance and reducing the weight, thereby increasing user convenience. In addition, the thinning of the electroactive liquid crystal 1400 may reduce the driving voltage and chromatic aberration.

In addition, the user can adjust the lens to the desired focal length by simply touching the compound lens or moving the head, which is more convenient than the existing single-focal lens, and it is laterally distorted by the distortion and astigmatism generated by the progressive multifocal lens. Poems can be prevented from blurring or shaking. In addition, by maintaining a single focus at one viewpoint, a wide field of view can be stably provided to the user.

9 is a block diagram of a composite lens according to a second exemplary embodiment of the present disclosure.

The composite lens 2000 according to the second embodiment of the present disclosure may include a lens unit 2100, an electroactive liquid crystal 2200, and an electrode 2300. In addition, according to an embodiment of the present disclosure, the composite lens 2000 may further include a user input unit 2400, a sensor unit 2500, a power supply unit 2600, and a frame 2700.

The lens unit 2100 according to the exemplary embodiment of the present disclosure may include two or more lenses including the first lens 2110 and the second lens 2130. More specifically, the lens unit 2100 may include a first lens 2110 disposed on a front surface corresponding to a subject side on the composite lens 2000 and a second lens disposed on a rear surface corresponding to a user side on the composite lens 2000. 2130. In this case, the first lens 2110 may be configured to have a first refractive index. In addition, the second lens 2130 may be configured to have a second refractive index. Here, the refractive index may mean a rate at which the luminous flux decreases when light proceeds to a transparent medium. In addition, the first lens 2110 may have a first refractive power, and the second lens 2130 may be configured to have a second refractive power. Here, the refractive power refers to a force for changing the direction of light and may use a diopter unit. The refractive power of the first lens 2110 and the second lens 2130 may be summed to form the refractive power of the composite lens 2000.

In addition, two or more lenses included in the lens unit 2100 according to the exemplary embodiment of the present disclosure may be configured as at least one of a concave lens, a convex lens, and an aspherical lens, respectively. In addition, according to the exemplary embodiment, the first lens 2110 and the second lens 2130 may be configured in a complementary structure to suppress aberration. The shapes of the first lens 2110 and the second lens 2130 described above are merely examples, and the present disclosure is not limited thereto.

In addition, one side of each of the first lens 2110 and the second lens 2130 may be disposed in contact with the electroactive liquid crystal 2200. More specifically, the first lens 2110 and the second lens 2130 may be spaced apart from each other, and the liquid crystal material may be filled therebetween to form the electroactive liquid crystal 2200. Accordingly, the electroactive liquid crystal 2200 may be configured to have a third refractive index that is variable based on the molecular arrangement of the liquid crystal.

The distance between the first lens 2110 and the second lens 2130 at the midpoint of the composite lens 2000 according to the exemplary embodiment of the present disclosure is the first lens 2110 and the second lens at the edge of the composite lens 2000. It may be different from the distance of 2130. Here, the midpoint of the compound lens 2000 may refer to a point corresponding to a center point with respect to the optical surface of the compound lens 2000. A detailed description of the structure of the above-described composite lens 2000 will be described later with reference to FIG. 10.

The electroactive liquid crystal 2200 according to an exemplary embodiment of the present disclosure may be formed by filling a liquid crystal material in a space formed by the first lens 2110 and the second lens 2130. In addition, the electroactive liquid crystal 2200 is disposed between the first lens 2110 and the second lens 2130, the molecular arrangement of the liquid crystal material based on the electric field formed by applying a voltage to the electrode 2300 This can be determined. Accordingly, the electroactive liquid crystal 2200 may be configured to have a third refractive index based on the electric field.

More specifically, the electroactive liquid crystal 2200 may be accommodated between the first lens 2110 and the second lens 2130. In addition, the electroactive liquid crystal 2200 may receive a voltage from an electrode 2300 disposed between the first lens 2110 and the second lens 2130. In addition, the electroactive liquid crystal 2200 may be configured such that an arrangement of molecules included in the liquid crystal material is changed by an applied voltage. Accordingly, the electroactive liquid crystal 2200 allows the refractive index of the light passing through the electroactive liquid crystal 2200 to be changed based on the applied voltage, thereby variably adjusting the focus of the composite lens 2000. Therefore, the composite lens 2000 according to the second exemplary embodiment of the present disclosure can provide a variable focus so that the user can be conveniently used without being affected by appearance and without having to wear and change glasses.

In addition, the electroactive liquid crystal 2200 may be disposed to cover all portions except edges of the first lens 2110 and the second lens 2130. More specifically, the electroactive liquid crystal 2200 may be configured to cover from the midpoint in the optical surface of the first lens 2110 and the optical surface of the second lens 2130 to a portion spaced apart by a predetermined distance. Can be. That is, in the composite lens 2000 according to the exemplary embodiment of the present disclosure, the majority of the light passing through the first lens 2110 passes through both the electroactive liquid crystal 2200 and the second lens 2130 and is concentrated in focus. Can be configured.

The electroactive liquid crystal 2200 according to an exemplary embodiment of the present disclosure may include at least one of nematic liquid crystal, smectic liquid crystal, ferroelectric liquid crystal, chiral liquid crystal, and cholesteric liquid crystal. In addition, the electroactive liquid crystal 2200 may be composed of a combination of two or more of the above-described liquid crystals. The above description of various liquid crystal types is merely an example, and the present disclosure is not limited thereto.

The electrode 2300 may be disposed on at least one surface of the front and rear surfaces of the electroactive liquid crystal 2200, and may be configured to apply a voltage to the electroactive liquid crystal 2200. More specifically, the electrode 2300 is disposed on at least one side of the front and rear of the electroactive liquid crystal 2200, so that the voltage in the thickness direction of the electroactive liquid crystal 2200 (that is, the thickness direction of the composite lens 2000). It can be configured to apply. In addition, the electrode 2300 may transmit light, and may be made of a material that is visually transparent. In addition, the electrode 2300 may be formed of an electrically conductive material (eg, an indium tin oxide (ITO) thin film).

The electrode 2300 according to the exemplary embodiment of the present disclosure may include an electrically active region 2310 formed of at least one closed curve and an electrode bar 2330 disposed adjacent to apply a voltage to the electrically active region 2310. have. Detailed description of the electrode 2300 has been described above with reference to FIG. 6. In addition, the electrode 2300 according to the exemplary embodiment of the present disclosure may include a first electrode line 2350 and a second electrode line 2370 formed in a cross structure on the insulating transparent layer. A detailed description of the first electrode line 2350 and the second electrode line 2370 will be described later with reference to FIGS. 12 and 13.

The lens unit 2100 including the first lens 2110 and the second lens 2130 and the electroactive liquid crystal 2200 may be configured to form one focal point on each optical surface. More specifically, two or more lenses included in the lens unit 2100 may be configured as surfaces having a size of 50 to 100 mm, respectively. In addition, each lens has a preset curvature on the front and rear to provide the comprehensive refractive power of the composite lens (2000). In addition, the electroactive liquid crystal 2200 may provide the composite lens 2000 with refractive power that is variable based on the arrangement of liquid crystal molecules. Then, the lens unit 2100 and the electroactive liquid crystal 2200 including the first lens 2110 and the second lens 2130 are configured to form one focus point at which light is concentrated based on each optical surface. can be.

Additionally, the composite lens 2000 according to the exemplary embodiment of the present disclosure may include a user input unit 2400 for changing the focal length based on the distance of the object to be viewed by the user. In this case, the user input unit 2400 may be located at one side (eg, the right eyeglass leg) of the frame 2700. In addition, the user input unit 2400 may include a push button, a touch sensor, and the like, and may include any means for sensing a user's input. Accordingly, the user input unit 2400 may generate a signal for adjusting the voltage applied to the electrode 2300 based on the user input. The above-described configuration and location description of the user input unit is merely an example, and the present disclosure is not limited thereto.

In addition, the composite lens 2000 according to the exemplary embodiment of the present disclosure may include a sensor unit 2500 for determining a posture of bowing down to look at an object located near by the user. Here, the sensor unit 2500 is located at a point of the frame 2700 (for example, between the first lens and the second lens) to detect gravity acceleration or to recognize the user's head movement so that the user may stare at near distance. Can be recognized. In addition, the sensor unit 2500 may generate a signal for adjusting the voltage applied to the electrode 2300 based on the determination. The signal for adjusting the voltage may be a signal for turning on the power of the composite lens 2000 or a signal for increasing a voltage applied through the electrode 2300.

Accordingly, the electrode 2300 may receive a signal for changing the focal length from the user input 2400 or the sensor 2500. The electrode 2300 may adjust the focal length of the composite lens 2000 or turn on / off the power by adjusting the voltage applied to the electroactive liquid crystal 2200 based on the input. In addition, when there is no signal from the user input unit 2400 and the sensor unit 2500, the electrode 2300 may determine that the user is staring at a long distance, and change or maintain the power to Off. Accordingly, a voltage may be applied to the electrode 2300 only when a user desires (for example, near vision), thereby reducing power consumption of the composite lens 2000 and extending usage time.

Additionally, the composite lens 2000 according to the exemplary embodiment of the present disclosure may provide an automatic mode that adjusts the focus distance based on the head angle of the user recognized by the sensor unit 2500. Herein, the automatic mode may be started by receiving an input from the user input unit 2400 or through a preset movement (eg, shaking the head two times from side to side).

In addition, the composite lens 2000 according to the exemplary embodiment of the present disclosure may receive a voltage from the power supply unit 2600 which is built in one side of the frame 2700. The power supply unit 2600 may be configured of a small battery (eg, a small mercury battery and a rechargeable battery), and may apply a voltage to the electrode 2300 based on a user input. In addition, the power supply unit 2600 may include a lightweight circuit connected to the frame 2700 and the electrode 2300 to apply an AC voltage or a square wave to the electroactive liquid crystal 2200.

Accordingly, the composite lens 2000 according to the second exemplary embodiment may greatly change the focal length by adjusting the electroactive liquid crystal 2200 based on an uneven electric field. In other words, the thickness of the lens required to change the same focal length can be reduced, improving the aesthetics in appearance and reducing the weight, thereby increasing user convenience. In addition, the thinning of the electroactive liquid crystal 2200 may reduce driving voltage and chromatic aberration.

In addition, the user can adjust the lens to the desired focal length by simply touching the compound lens or moving the head, which is much more convenient than the existing single-focal lens. Poems can be prevented from blurring or shaking. In addition, by maintaining a single focus at one viewpoint, a wide field of view can be stably provided to the user.

10 is a combination view of a composite lens showing a midpoint portion and an edge portion according to the second embodiment of the present disclosure.

According to an embodiment of the present disclosure, the distance between the first lens 2110 and the second lens 2130 at the midpoint C of the composite lens 2000 may be defined by the first lens at the edge E of the composite lens 2000. The distance between the 2110 and the second lens 2130 may be different. Here, the midpoint C of the compound lens 2000 may refer to a point corresponding to a center point with respect to the optical surface of the compound lens 2000. More specifically, the electroactive liquid crystal 2200 may have a structure formed by filling between the first lens 2110 and the second lens 2130. Here, the distance between the first lens 2110 and the second lens 2130 may not be the same at all points. Accordingly, the electroactive liquid crystal 2200 may be configured such that the shortest distance from any one lens (eg, the second lens 2130) depends on the position on the composite lens 2000. For example, the distance between the first lens 2110 and the second lens 2130 at the midpoint C may be 0.01 mm, and the first lens 2110 and the second lens 2130 at the edge E may be separated. The distance of may be 0.008mm. The above description of the distance between lenses is merely an example of description and the present disclosure is not limited thereto. In contrast, the distance between the two lenses at the edge E may be configured to be longer than the distance between the two lenses at the midpoint C. FIG.

In addition, the third refractive index according to an embodiment of the present disclosure may be determined by a combination of the midpoint refractive index at the midpoint C and the edge refractive index at the edge E. FIG. Here, the distance between the first lens 2110 and the second lens 2130 at the midpoint C is different from the distance between the first lens 2110 and the second lens 2130 at the edge E of the composite lens 2000. can do. Accordingly, the midpoint refractive index and the edge refractive index may be different from each other.

According to an embodiment of the present disclosure, the first lens 2110 is configured to have a first refractive index, the second lens 2130 is configured to have a second refractive index, and the electroactive liquid crystal 2200 may be configured to have a third refractive index. It can be configured to have a refractive index. In addition, the first lens 2110 and the second lens 2130 included in the lens unit 2100 may form one focal point like the electroactive liquid crystal 2200. More specifically, the first lens 2110 may be configured to have a first refractive index and the second lens 2130 may have a second refractive index. In addition, the electroactive liquid crystal 2200 may provide the composite lens 2000 with a refractive index that is variable based on the arrangement of liquid crystal molecules. Then, the lens unit 2100 and the electroactive liquid crystal 2200 including the first lens 2110 and the second lens 2130 are configured to form one focus point at which light is concentrated based on each optical surface. can be.

11 is a side cross-sectional view of a composite lens according to a second embodiment of the present disclosure.

In the electroactive liquid crystal 2200 according to the exemplary embodiment, one or more state levels may be determined based on a voltage applied to the electroactive region 2310 through the electrode bar 2330. The number of state levels may be configured to correspond to the number of electrically active regions 2310, respectively. More specifically, referring to FIG. 6, the total voltage applied by the electrode 2300 to the electroactive liquid crystal 2200 may be determined based on the number applied to the electroactive region 2310 through the electrode bar 2330. The direction in which the liquid crystal molecules included in the electroactive liquid crystal 2200 are arranged may be adjusted based on the number of the electroactive regions 2310 to which voltage is applied. For example, when voltages are applied to all four electrically active regions 2310 by four electrode bars 2330, voltages are applied to only one electrically active region 2310 by one electrode bar 2330. An overall voltage about four times higher than when applied can be applied. Accordingly, the liquid crystal molecules may rotate about four times as much as the arrangement of the molecules than when voltage is applied to one electroactive region 2310. The description of the number of the electrode bars 2330 or the movement of the liquid crystal molecules is only an example, and the present disclosure is not limited thereto.

In addition, the distance between the first lens 2110 and the second lens 2130 according to an embodiment of the present disclosure is from the middle point C to the edge E so that the intensity of the electric field is unbalanced on the electroactive liquid crystal 2200. It may be determined differently based on the distance. More specifically, the electroactive liquid crystal 2200 may have a structure formed by filling between the first lens 2110 and the second lens 2130. Here, the distance between the first lens 2110 and the second lens 2130 may not be the same at all points. Accordingly, the electroactive liquid crystal 2200 may be configured such that the shortest distance from any one lens (eg, the second lens 2130) depends on the position on the composite lens 2000. That is, in the electroactive liquid crystal 2200, the shortest distance from the electrode 2300 disposed on one surface of an arbitrary lens (eg, the second lens 2130) may vary depending on the position on the composite lens 2000. . Also, due to this, the intensity of the magnetic field generated when the electrode 2300 applies a voltage onto the electroactive liquid crystal 2200 may vary depending on the position of the electroactive liquid crystal 2200.

In addition, the liquid crystal materials having the same distance between the position on the electroactive liquid crystal 2200 and the midpoint according to the exemplary embodiment of the present disclosure may be determined to have the same state level. More specifically, the thickness of the electroactive liquid crystal 2200, that is, the distance between the first lens 2110 and the second lens 2130 may be determined based on the distance from the midpoint of the electroactive liquid crystal 2200. In addition, the liquid crystal molecules included in the electroactive liquid crystal 2200 may be located at different distances (eg, R1, R2, and R3) from the midpoint. For example, the distance between two lenses in the vicinity of the midpoint R1 may be 0.008mm, 0.009mm between the midpoint and the edge R2, and 0.01mm at the edge R3. In addition, the distance to the electrode 2300 at each point may be the same. In this case, when the electrode 2300 applies a voltage to the electroactive liquid crystal 2200, the intensity of the electric field may be different at the midpoint R1, the midpoint and the edge R2, and the edge R3, respectively. In addition, the state level of each liquid crystal molecule may be determined based on the intensity of the electric field. Thus, liquid crystal molecules having the same distance at the midpoint (eg, one of R1, R2 and R3) may have the same state level, and liquid crystal molecules having different distances at the midpoint may have different state levels.

Therefore, the composite lens 2000 according to the exemplary embodiment may generate an electric field that is not spatially uniform when the electrode 2300 applies a voltage. Therefore, the liquid crystal molecules positioned adjacent to the electrode 2300 may be arranged differently from the initial alignment state (eg, perpendicular to the substrate). On the other hand, the liquid crystal molecules far away from the electrode 2300 are not affected by the electric field so that the liquid crystals may be arranged in an initial alignment state (eg, parallel to the substrate). As a result, the composite lens 2000 may adjust the effective refractive index of the liquid crystal based on the intensity of the electric field and may change the focus.

Accordingly, the composite lens 2000 according to the second exemplary embodiment may greatly change the focal length by adjusting the electroactive liquid crystal 2200 based on an uneven electric field. In other words, the thickness of the lens required to change the same focal length can be reduced, improving the aesthetics in appearance and reducing the weight, thereby increasing user convenience. In addition, the thinning of the electroactive liquid crystal 2200 may reduce driving voltage and chromatic aberration.

In addition, the user can adjust the lens to the desired focal length by simply touching the compound lens or moving the head, which is more convenient than the existing single-focal lens, and it is laterally distorted by the distortion and astigmatism generated by the progressive multifocal lens. Poems can be prevented from blurring or shaking. In addition, by maintaining a single focus at one viewpoint, a wide field of view can be stably provided to the user.

12 is an exemplary top view of an electrode including a first electrode line and a second electrode line in accordance with a second embodiment of the present disclosure.

The composite lens 2000 according to the second embodiment of the present disclosure may include a lens unit 2100, an electroactive liquid crystal 2200, and an electrode 2300. In addition, according to an embodiment of the present disclosure, the composite lens 2000 may further include a user input unit 2400, a sensor unit 2500, a power supply unit 2600, and a frame 2700. The lens unit 2100 and the electroactive liquid crystal 2200 have been described above with reference to FIG. 9.

The electrode 2300 according to the exemplary embodiment of the present disclosure may be disposed on at least one of front and rear surfaces of the electroactive liquid crystal 2200. In addition, the electrode 2300 may include a first electrode line 2350 and a second electrode line 2370 formed in a cross structure on the insulating transparent layer. In more detail, the electrodes 2300 may include a plurality of first electrode lines 2350 and a plurality of second electrode lines 2370 formed by diagonal metal lines on a front surface or a rear surface of one lens included in the lens unit 2100. ) May be formed together. The first electrode line 2350 and the second electrode line 2370 may form a crossover structure repeatedly. Therefore, the first electrode line 2350 and the second electrode line 2370 may be configured to cover the entire surface of the electroactive liquid crystal 2200 to apply a voltage to the electroactive liquid crystal 2200.

In addition, the liquid crystal material according to the exemplary embodiment of the present disclosure may be determined as one of one or more state levels based on the strength of the electric field formed as the voltage is applied to the electrode 2300. The electric field may be determined based on the density of the first electrode line and the second electrode line. More specifically, referring to FIG. 6, the intensity of the total voltage, ie, the electric field, applied by the electrode 2300 to the electroactive liquid crystal 2200 based on the number applied to the electroactive region 2310 through the electrode bar 2330. Can be determined. The direction in which the liquid crystal molecules included in the electroactive liquid crystal 2200 are arranged may be adjusted based on the number of the electroactive regions 2310 to which voltage is applied. In addition, as the first electrode line 2350 and the second electrode line 2370 are densely arranged, the intensity of the electric field may increase. On the other hand, as the first electrode line 2350 and the second electrode line 2370 are arranged in a rough manner, the intensity of the electric field may be weakened.

At the center of the composite lens 2000 according to an embodiment of the present disclosure, the density of the first electrode line 2350 and the second electrode line 2370 is such that the intensity of the electric field on the electroactive liquid crystal 2200 is unbalanced. The density of the first electrode line 2350 and the second electrode line 2370 at the edge of 2000 may be different. More specifically, the density at which the first electrode line 2350 and the second electrode line 2370 are disposed may be determined based on a distance from the midpoint of the electroactive liquid crystal 2200. In addition, the liquid crystal molecules included in the electroactive liquid crystal 2200 may have different distances from the midpoint (eg, Center and Edge), respectively. For example, the density of the first electrode line 2350 and the second electrode line 2370 in the center of the center is the first electrode line 2350 and the second electrode line 2370 at the edge (Edge) It may be twice the density of. In this case, since the electrode 2300 applies a voltage to the electroactive liquid crystal 2200, the intensity of the electric field generated at the center of the center and the edge may be different from each other. In addition, the state level of each liquid crystal molecule may be determined based on the intensity of the electric field. Thus, liquid crystal molecules having similar distances at the midpoint may have the same state level, and liquid crystal molecules having different distances at the midpoint may have different state levels.

13 is a cross structure of a first electrode line and a second electrode line according to the second exemplary embodiment of the present disclosure.

The electrode 2300 according to the exemplary embodiment of the present disclosure may include a first electrode line 2350 and a second electrode line 2370 formed in a cross structure in an insulating transparent layer. Here, the second electrode line 2370 may include one or more disconnection regions configured to be electrically separated from the first electrode line 2350 based on an area crossing the first electrode line 2350. In addition, both ends 2372 and 2373 of the disconnection region form a step perpendicular to the advancing direction of the second electrode line 2370 to electrically connect the second electrode lines 2370 that are disconnected to both sides by the disconnection region. It can be configured to.

More specifically, the electrode 2300 may be disposed to intersect the first electrode line 2350 and the second electrode line 2370 on the insulating transparent layer. In the region where the first electrode line 2350 and the second electrode line 2370 cross each other, the two partial electrodes 2372 may be electrically disconnected from the first electrode line 2350. 2373). In addition, both ends 2272 and 2373 of the disconnection region may be configured to form a step in the height direction of the reference of FIG. 13 perpendicular to the advancing direction of the second electrode line 2370, respectively. Here, the step in the height direction may be maintained in an electrically connected state. In addition, the second electrode line 2370 may further include a connection accessory 2471 for electrically connecting both ends 2372 and 2373 of the disconnection region.

14 is a block diagram illustrating a composite lens 3000 including an electroactive liquid crystal according to a third embodiment of the present disclosure.

The composite lens 3000 according to the third exemplary embodiment of the present disclosure may include a lens unit 3100, an electroactive liquid crystal unit 3200, an electrode 3300, and an intermediate layer 3400. In addition, according to an embodiment of the present disclosure, the composite lens 3000 may further include a user input unit 3500, a sensor unit 3600, a power supply unit 3700, and a frame 3800.

The lens unit 3100 according to the exemplary embodiment of the present disclosure may include two or more lenses including the first lens 3110 and the second lens 3130. More specifically, the lens unit 3100 may include a first lens 3110 disposed on a front surface corresponding to a subject side on the compound lens 3000 and a second lens disposed on a rear surface corresponding to a user side on the composite lens 3000. 3130 may be included. In this case, the first lens 3110 may be configured to have a first refractive index. In addition, the second lens 3130 may be configured to have a second refractive index. Here, the refractive index may mean a rate at which the luminous flux decreases when light proceeds to a transparent medium. In addition, the first lens 3110 may have a first refractive power, and the second lens 3130 may be configured to have a second refractive power. Here, the refractive power refers to a force for changing the direction of light and may use a diopter unit. In addition, the refractive power of the first lens 3110 and the second lens 3130 may be summed up to form the refractive power of the composite lens 3000.

In addition, two or more lenses included in the lens unit 3100 according to the exemplary embodiment of the present disclosure may be configured as at least one of a concave lens, a convex lens, and an aspherical lens, respectively. In addition, according to the exemplary embodiment, the first lens 3110 and the second lens 3130 may be configured in a complementary structure to suppress aberration. The shapes of the first lens 3110 and the second lens 3130 described above are merely examples, and the present disclosure is not limited thereto.

In addition, each of the first lens 3110 and the second lens 3130 may be disposed in contact with one or more electroactive liquid crystals. More specifically, the electroactive liquid crystal may be configured such that one or more lenses and the intermediate layer 3400 are spaced apart from each other, and a liquid crystal material is filled therebetween. Accordingly, the electroactive liquid crystal can be configured to have a third refractive index that is varied based on the molecular arrangement of the liquid crystal.

An electroactive liquid crystal unit 3200 according to an exemplary embodiment of the present disclosure may include a first electroactive liquid crystal 3210, an intermediate layer 3400, and a second lens 3130 disposed between the first lens 3110 and the intermediate layer 3400. ) May be composed of two or more electroactive liquid crystals, including a second electroactive liquid crystal 3230 disposed between them. The first electroactive liquid crystal 3210 may be formed by filling a liquid crystal material in a space formed by the first lens 3110 and the intermediate layer 3400. In addition, the second electroactive liquid crystal 3230 may be formed by filling a liquid crystal material in a space formed by the intermediate layer 3400 and the second lens 3130. In addition, the molecular arrangement of the liquid crystal material may be determined in the first electroactive liquid crystal 3210 and the second electroactive liquid crystal 3230 based on an electric field formed as a voltage is applied to the electrode 3300. Accordingly, the individual electroactive liquid crystals included in the electroactive liquid crystal unit 3200 may be configured to have a third refractive index based on the electric field. Here, the liquid crystal material included in the first electroactive liquid crystal 3210 and the liquid crystal material included in the second electroactive liquid crystal 3230 may be different from each other.

More specifically, the first electroactive liquid crystal 3210 included in the electroactive liquid crystal unit 3200 may be formed between one or more lenses included in the lens unit 3100 and the intermediate layer 3400. In addition, each of the electroactive liquid crystals may receive a voltage from one or more lenses included in the lens unit 3100 or an electrode 3300 disposed between the intermediate layer 3400. In addition, each of the electroactive liquid crystals may be configured such that an arrangement of molecules included in the liquid crystal material is changed by a voltage applied thereto. Accordingly, each of the electroactive liquid crystals allows the refractive index of the light passing through the electroactive liquid crystals to be changed based on the applied voltage, thereby variably adjusting the focus of the composite lens 3000. Therefore, the composite lens 3000 according to the third exemplary embodiment of the present disclosure can provide a variable focus, so that the user can be conveniently used without being influenced by appearance and without having to change glasses.

In addition, each of the electroactive liquid crystals included in the electroactive liquid crystal unit 3200 may be disposed to cover all portions except edges of the first lens 3110 and the second lens 3130. More specifically, each of the electroactive liquid crystals may be configured to cover from the midpoint at the optical surface of the first lens 3110 and the optical surface of the second lens 3130 to a spaced apart portion by a predetermined distance. have. That is, the composite lens 3000 according to an exemplary embodiment of the present disclosure may be configured such that a majority of the light passing through the first lens 3110 passes through both the electroactive liquid crystal and the second lens 3130 and is concentrated in focus. have.

Each of the electroactive liquid crystals included in the electroactive liquid crystal unit 3200 according to an exemplary embodiment of the present disclosure may include at least one of nematic liquid crystal, smectic liquid crystal, ferroelectric liquid crystal, chiral liquid crystal, and cholesteric liquid crystal. have. In addition, the electroactive liquid crystal may be composed of a combination of two or more of the above-described liquid crystals. The above description of various liquid crystal types is merely an example, and the present disclosure is not limited thereto.

The electrode 3300 may be configured to apply a voltage to at least one of two or more electroactive liquid crystals. The electrode 3300 may be disposed on at least one of front and rear surfaces of each lens or intermediate layer 3400 included in the lens unit 3100, and may be configured to apply a voltage to the electroactive liquid crystal. More specifically, the electrode 3300 may be disposed on at least one side of the front and rear surfaces of the one or more electroactive liquid crystals to apply a voltage in the thickness direction of the electroactive liquid crystal (ie, the thickness direction of the composite lens 3000). It can be configured to be. In addition, the electrode 3300 may transmit light, and may be made of a visually transparent material. In addition, the electrode 3300 may be formed of an electrically conductive material (eg, an indium tin oxide (ITO) thin film).

The electrode 3300 according to an exemplary embodiment of the present disclosure may include an electrically active region formed by at least one closed curve and an electrode bar disposed adjacent to apply a voltage to the electrically active region. Detailed description of the electrode 3300 has been described above with reference to FIG. 6.

In addition, the electrode 3300 according to the exemplary embodiment of the present disclosure may include at least one of the first electrode 3310, the second electrode 3330, and the third electrode 3350. The first electrode 3310 may be disposed between the first lens 3110 and the first electroactive liquid crystal 3210, and the second electrode 3330 may be the second electroactive liquid crystal 3230 and the second lens. It may be disposed between (3130). The third electrode 3350 may be disposed between two or more electroactive liquid crystals.

In addition, the first electroactive liquid crystal 3210 according to an embodiment of the present disclosure may have a third refractive index determined based on an electric field formed by the first electrode 3310 and the third electrode 3350. In addition, the second electroactive liquid crystal 3230 may have a fourth refractive index determined based on an electric field formed by the second electrode and the third electrode 3350. The third electrode 3350 may replace the intermediate layer 3400 or include a third electrode front part 3331 and a third electrode rear part 3353. Detailed description thereof will be described later with reference to FIGS. 15 and 16.

The lens unit 3100 including the first lens 3110 and the second lens 3130, and the first electroactive liquid crystal 3210 and the second electroactive liquid crystal 3230 according to an exemplary embodiment of the present disclosure. The electroactive liquid crystal portion 3200 may be configured to form one focal point on each optical surface. More specifically, two or more lenses included in the lens unit 3100 may be configured as surfaces having a size of 50 to 100 mm, respectively. In addition, each lens has a preset curvature on the front and rear to provide a comprehensive refractive power of the composite lens (3000). In addition, the two or more electroactive liquid crystals included in the electroactive liquid crystal unit 3200 may provide the composite lens 3000 with a third refractive power that is varied based on the arrangement of the liquid crystal molecules. In addition, through this, the lens unit 3100 including the first lens 3110 and the second lens 3130, and the electroactive liquid crystal including the first electroactive liquid crystal 3210 and the second electroactive liquid crystal 3230 may be used. It can be configured to form one focal point where light is focused about each optical plane.

One or more intermediate layers 3400 may be disposed between the first lens 3110 and the second lens 3130 to distinguish each of the electroactive liquid crystals. The intermediate layer 3400 may be made of a transparent material that is non-transmissive to at least one of the liquid crystal materials included in each of the electroactive liquid crystals and may transmit light. In addition, the intermediate layer 3400 may be configured between the respective electroactive liquid crystals to prevent the liquid crystal material between two or more electroactive liquid crystals included in the electroactive liquid crystal unit 3200.

Additionally, the composite lens 3000 according to the exemplary embodiment of the present disclosure may include a user input unit 3500 for changing the focal length based on the distance of the object to be viewed by the user. Herein, the user input unit 3500 may be located at one side of the frame 3800 (for example, the right eyeglass leg). In addition, the user input unit 3500 may include a push button, a touch sensor, and the like, and may include any means for sensing a user's input. Accordingly, the user input unit 3500 may generate a signal for adjusting the voltage applied to the electrode 3300 based on the user input. The above-described configuration and location description of the user input unit is merely an example, and the present disclosure is not limited thereto.

In addition, the composite lens 3000 according to the exemplary embodiment of the present disclosure may include a sensor unit 3600 for determining a posture of bowing down to look at an object located near by the user. Here, the sensor unit 3600 is located at one point of the frame 3800 (for example, between the first lens and the second lens) to detect gravity acceleration or to recognize the user's head movement so that the user may stare at near distance. Can be recognized. The sensor unit 3600 may generate a signal for adjusting the voltage applied to the electrode 3300 based on the determination. The signal for adjusting the voltage may be a signal for turning on the power of the composite lens 3000 or a signal for increasing a voltage applied through the electrode 3300.

Accordingly, the electrode 3300 may receive a signal for changing the focal length from the user input unit 3500 or the sensor unit 3600. The electrode 3300 may adjust the focal length of the composite lens 3000 or turn on / off the power by adjusting the voltage applied to the electroactive liquid crystal unit 3200 based on the input. In addition, when there is no signal from the user input unit 3500 and the sensor unit 3600, the electrode 3300 may determine that the user is staring at a long distance, and change or maintain the power to Off. Accordingly, a voltage may be applied to the electrode 3300 only when a user desires (for example, near vision), thereby reducing power consumption of the composite lens 3000 and extending usage time.

Additionally, the composite lens 3000 according to the exemplary embodiment of the present disclosure may provide an automatic mode that adjusts the focus distance based on the head angle of the user recognized by the sensor unit 3600. In this case, the automatic mode may be started by receiving an input from the user input unit 2500 or through a preset movement (eg, shaking the head twice from side to side).

In addition, the composite lens 3000 according to the exemplary embodiment of the present disclosure may receive a voltage from a power supply 3700 embedded in one side of the frame 3800. Herein, the power supply 3700 may include a small battery (eg, a small mercury battery and a rechargeable battery), and may apply a voltage to the electrode 3300 based on a user input. In addition, the power supply 3700 may include a light circuit connected to the frame 3800 and the electrode 3300 to apply an AC voltage or a square wave to the electroactive liquid crystal unit 3200.

Accordingly, the composite lens 3000 according to the third embodiment may include two or more electroactive liquid crystals, thereby greatly improving the focal length adjusting capability through the arrangement of the liquid crystals. In addition, the user can adjust the lens to the desired focal length by simply touching the compound lens or moving the head, which is more convenient than the existing single-focal lens, and it is laterally distorted by the distortion and astigmatism generated by the progressive multifocal lens. Poems can be prevented from blurring or shaking. In addition, by maintaining a single focus at one viewpoint, a wide field of view can be stably provided to the user.

15 is a side cross-sectional view of a composite lens including two or more electroactive liquid crystals divided into intermediate layers according to a third embodiment of the present disclosure.

15 is a side cross-sectional view of a state in which a voltage is applied to the composite lens 3000 according to the third embodiment of the present disclosure.

The composite lens 3000 may be disposed in the order of the first lens 3110, the first electroactive liquid crystal 3210, the intermediate layer 3400, the second electroactive liquid crystal 3230, and the second lens 3130. It may include an electrode 3300 disposed between each configuration. In addition, in FIG. 15, the first lens 3110 and the intermediate layer 3400 are shown to be in contact with each other to accommodate the first electroactive liquid crystal 3210, and the intermediate layer 3400 and the second lens 3130 each other. Although illustrated as being in contact with the second electroactive liquid crystal 3230, the first electroactive liquid crystal 3210 and the second electroactive liquid crystal 3230 may be sealed through separate configurations.

The first lens 3110 according to the exemplary embodiment of the present disclosure may be disposed on the front surface corresponding to the subject side on the compound lens 3000. In addition, the first lens 3110 may be configured to have a first refractive index. In addition, the second lens 3130 may be disposed on the rear surface corresponding to the user side on the composite lens 3000. The second lens 3130 may be configured to have a second refractive index different from the first refractive index.

In FIG. 15, the first electroactive liquid crystal 3210 and the second electroactive liquid crystal 3230 may be aligned with the height direction of the composite lens 3000 with the voltage applied due to the electrode 3300. . Accordingly, the composite lens 3000 according to an exemplary embodiment of the present disclosure applies a voltage to the first electroactive liquid crystal 3210 and the second electroactive liquid crystal 3230 for an additional refractive index when the user gazes at a near distance. Can be. On the contrary, the composite lens 3000 does not apply voltage to the first electroactive liquid crystal 3210 and the second electroactive liquid crystal 3230 when the user does not need an additional refractive index such as when gazing at a long distance or a medium distance. In addition, only the refractive indices of the first lens 3110 and the second lens 3130 may be provided.

In addition, the composite lens 3000 according to the exemplary embodiment of the present disclosure may include one or more third lenses 3150 disposed between the first lens 3110 and the second lens 3130 and individually having a refractive index. can do. Here, the third lens 3150 may replace the intermediate layer 3400 and may have a separate refractive index.

The electrode 3300 according to an exemplary embodiment of the present disclosure may further include one or more third electrodes 3350 disposed between two or more electroactive liquid crystals. More specifically, as shown in FIG. 15, the electrode 3300 may further include a third electrode front portion 3331 disposed on the rear surface of the first electroactive liquid crystal 3210, and the second electroactive liquid crystal It may further include a third electrode rear portion 3353 disposed on the front of the (3230). Accordingly. The first electroactive liquid crystal 3210 may have a third refractive index determined based on an electric field formed by the first electrode 3310 and the third electrode front part 3331. In addition, the second electroactive liquid crystal 3230 may have a fourth refractive index determined based on an electric field formed by the second electrode and the third electrode rear part 3335.

In addition, the electrode 3300 according to the exemplary embodiment of the present disclosure is configured to apply voltages to the third electrode front part 3331 and the third electrode rear part 3335 independently, so that the third and fourth refractive indices are increased. You can decide independently of each other.

16 is a side cross-sectional view of a composite lens including two or more electroactive liquid crystals divided into third electrodes according to a third embodiment of the present disclosure.

16 is a side cross-sectional view of a state in which a voltage is applied to the composite lens 3000 according to the third embodiment of the present disclosure.

The composite lens 3000 may be arranged in the order of the first lens 3110, the first electroactive liquid crystal 3210, the second electroactive liquid crystal 3230, and the second lens 3130, between the respective components. It may include an electrode 3300 disposed. More specifically, as shown in FIG. 16, a first electrode 3310 is disposed between the first lens 3110 and the first electroactive liquid crystal 3210, and the first electroactive liquid crystal 3210 and the second are disposed. The third electrode 3350 may be disposed between the electroactive liquid crystals 3230, and the second electrode 3330 may be disposed between the second electroactive liquid crystals 3230 and the second lens 3130. In addition, the first lens 3110 and the third electrode 3350 are in contact with each other to accommodate the first electroactive liquid crystal 3210, and the third electrode 3350 and the second lens 3130 are in contact with each other to form a first electrode. The two electroactive liquid crystals 3230 can be accommodated. However, the first electroactive liquid crystal 3210 and the second electroactive liquid crystal 3230 may be sealed through separate configurations.

The first lens 3110 according to the exemplary embodiment of the present disclosure may be disposed on the front surface corresponding to the subject side on the compound lens 3000. In addition, the first lens 3110 may be configured to have a first refractive index. In addition, the second lens 3130 may be disposed on the rear surface corresponding to the user side on the composite lens 3000. The second lens 3130 may be configured to have a second refractive index different from the first refractive index.

In FIG. 16, the first electroactive liquid crystal 3210 and the second electroactive liquid crystal 3230 may be aligned in the height direction of the composite lens 3000 with the voltage applied due to the electrode 3300. . Accordingly, the composite lens 3000 according to an exemplary embodiment of the present disclosure applies a voltage to the first electroactive liquid crystal 3210 and the second electroactive liquid crystal 3230 for an additional refractive index when the user gazes at a near distance. Can be. On the other hand, the composite lens 3000 according to an exemplary embodiment of the present disclosure may use the first electroactive liquid crystal 3210 and the second electroactive liquid crystal when the user does not need an additional refractive index, such as when the user gazes at a long distance or a medium distance. By not applying a voltage to the 3230, only the refractive indices of the first lens 3110 and the second lens 3130 may be provided.

The electrode 3300 according to an exemplary embodiment of the present disclosure may further include one or more third electrodes 3350 disposed between two or more electroactive liquid crystals. More specifically, as shown in FIG. 16, the electrode 3300 further includes a third electrode 3350 disposed between the rear surface of the first electroactive liquid crystal 3210 and the front surface of the second electroactive liquid crystal 3230. It may include. Accordingly. The first electroactive liquid crystal 3210 may have a third refractive index determined based on an electric field formed by the first electrode 3310 and the third electrode 3350. In addition, the second electroactive liquid crystal 3230 may have a fourth refractive index determined based on an electric field formed by the second electrode and the third electrode 3350. Accordingly, the composite lens 3000 according to the exemplary embodiment of the present disclosure may adjust the third refractive index and the fourth refractive index at the same time by adjusting the voltage applied through the third electrode.

In addition, the intermediate layer 3400 according to the exemplary embodiment of the present disclosure may be the same as the third electrode 3350. More specifically, the intermediate layer 3400 may be configured of the same material as the electrode 3300 (eg, an ITO electrode) to distinguish the first electroactive liquid crystal 3210 and the second electroactive liquid crystal 3230. Accordingly, the thickness of the composite lens 3000, which is essentially increased by disposing the intermediate layer 3400, may be reduced to a minimum.

Accordingly, the composite lens 3000 according to the third embodiment may include two or more electroactive liquid crystals, thereby greatly improving the focal length adjusting capability through the arrangement of the liquid crystals. In addition, the user can adjust the lens to the desired focal length by simply touching the compound lens or moving the head, which is more convenient than the existing single-focal lens, and it is laterally distorted by the distortion and astigmatism generated by the progressive multifocal lens. Poems can be prevented from blurring or shaking. In addition, by maintaining a single focus at one viewpoint, a wide field of view can be stably provided to the user.

Those skilled in the art will appreciate that information and signals may be represented using any of a variety of different technologies and techniques. For example, data, instructions, instructions, information, signals, bits, symbols, and chips that may be referenced in the above description may include voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields. Or particles, or any combination thereof.

One of ordinary skill in the art of the disclosure will appreciate that the various illustrative logical blocks, modules, processors, means, circuits and algorithm steps described in connection with the embodiments disclosed herein may be implemented in electronic hardware, It will be appreciated that for purposes of the present invention, various forms of program or design code, or combinations thereof, may be implemented. To clearly illustrate this interchangeability of hardware and software, various illustrative components, blocks, modules, circuits, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system. One skilled in the art of the present disclosure may implement the described functionality in various ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present disclosure.

The various embodiments presented herein may be embodied in a method, apparatus, or article of manufacture using standard programming and / or engineering techniques. The term "article of manufacture" includes a computer program, carrier, or media accessible from any computer-readable device. Here, the medium may include a storage medium and a transmission medium. For example, computer-readable storage media may include magnetic storage devices (eg, hard disks, floppy disks, magnetic strips, etc.), optical discs (eg, CDs, DVDs, etc.), smart cards, and flashes. Memory devices (eg, EEPROM, cards, sticks, key drives, etc.), but are not limited to these. In addition, various storage media presented herein include one or more devices and / or other machine-readable media for storing information. In addition, transmission media include, but are not limited to, wireless channels and various other media capable of conveying command (s) and / or data.

It is to be understood that the specific order or hierarchy of steps in the processes presented is an example of exemplary approaches. Based upon design priorities, it is understood that the specific order or hierarchy of steps in the processes may be rearranged within the scope of the present disclosure. The accompanying method claims present elements of the various steps in a sample order, but are not meant to be limited to the specific order or hierarchy presented.

The description of the presented embodiments is provided to enable any person skilled in the art to make or use the present disclosure. Various modifications to these embodiments will be apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the scope of the present disclosure. Thus, the present disclosure should not be limited to the embodiments presented herein but should be construed in the broadest scope consistent with the principles and novel features presented herein.

200: substrate
300: Nanostructure
400: first replica
500: second replica
600: Mold
700: stamper
1000: Compound Lens (First Embodiment)
1100: first lens
1200: second lens
1210: Nanostructures
1300: third lens
1400: electroactive liquid crystal
1500: electrode
1510: electrically active area
1530: electrode bars
1600: user input unit
1700: sensor
1800: power supply
1900: frame
2000: Compound Lens (2nd Example)
2100: lens unit
2110: first lens
2130: second lens
2150: third lens
2200: electroactive liquid crystal
2300: electrode
2310: electrically active area
2330: electrode bar
2350: first electrode line
2370: second electrode line
2371: connecting parts
3000: compound lens (third embodiment)
3100: Lens part
3110: first lens
3130: second lens
3150: third lens
3200: electroactive liquid crystal part
3210: first electrically active liquid crystal
3230: second electrically active liquid crystal
3300: electrode
3310: first electrode
3330: second electrode
3350: third electrode
3351: third electrode front portion
3353: third electrode rear portion
3400: middle layer

Claims (11)

In the composite lens,
A lens unit including a first lens disposed on a front surface corresponding to a subject side on the compound lens and a second lens disposed on a rear surface corresponding to a user side on the composite lens;
An electroactive liquid crystal formed by filling a liquid crystal material in a space formed by the first lens and the second lens, and determining a molecular arrangement of the liquid crystal material based on an electric field formed by applying a voltage to an electrode; And
An electrode disposed on at least one of front and rear surfaces of the electroactive liquid crystal;
Including, and
The distance between the first lens and the second lens,
Differently determined based on the distance from the center to the edge so that the intensity of the electric field is unbalanced on the electroactive liquid crystal, the center corresponds to the center point with respect to the optical plane of the composite lens,
Composite lens.
The method of claim 1,
The liquid crystal material,
Is determined as one of one or more phase levels based on the strength of the electric field formed as a voltage is applied to the electrode, and
The electric field is,
Determined based on the position in the electroactive liquid crystal,
Composite lens.
The method of claim 2,
Wherein the liquid crystal materials having the same distance between the position on the electroactive liquid crystal and the midpoint are determined to have the same state level,
Composite lens.
delete The method of claim 1,
The first lens is configured to have a first refractive index,
The second lens is configured to have a second refractive index, and
The electroactive liquid crystal is configured to have a third index of refraction forming a focal point for the composite lens,
Composite lens.
The method of claim 5,
The third refractive index is
Determined by a combination of a midpoint refractive index at the midpoint and an edge refractive index at the edge, the edge refractive index being different from the midpoint refractive index,
Composite lens.
In the composite lens,
A lens unit including a first lens disposed on a front surface corresponding to a subject side on the compound lens and a second lens disposed on a rear surface corresponding to a user side on the composite lens;
An electroactive liquid crystal formed by filling a liquid crystal material in a space formed by the first lens and the second lens, and determining a molecular arrangement of the liquid crystal material based on an electric field formed by applying a voltage to an electrode; And
An electrode including a first electrode line and a second electrode line disposed on at least one surface of a front surface and a rear surface of the electroactive liquid crystal, and formed to have an intersecting structure in an insulating transparent layer;
Including,
The liquid crystal material,
A voltage is applied to the electrode to determine one of the one or more phase levels based on the strength of the electric field determined based on the density of the first and second electrode lines.
Composite lens.
delete The method of claim 7, wherein
In the midpoint of the composite lens, wherein the midpoint corresponds to a center point with respect to the optical surface of the composite lens, the density of the first electrode line and the second electrode line is:
Different from the density of the first electrode line and the second electrode line at the edge of the composite lens such that the intensity of the electric field on the electroactive liquid crystal is unbalanced,
Composite lens.
The method of claim 7, wherein
The electrode,
Composed of visually transparent material,
Composite lens.
The method of claim 7, wherein
The second electrode line,
At least one break region configured to be electrically separated from the first electrode line with respect to the region crossing the first electrode line, and
Both ends of the disconnection region,
And forming a step perpendicular to the advancing direction of the second electrode line so as to electrically connect the second electrode line disconnected to both sides by the disconnection region.
Composite lens.

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