KR20210082671A - Eyeglasses for providing variable focus - Google Patents

Abstract

The present invention relates to eyeglasses providing variable focus, comprising: a lens having a liquid crystal layer including a first variable focus region and a second variable focus region; a frame coupled to a portion of the lens to fix the lens, and having a shape that can be worn by a user of the eyeglasses; and a control unit for varying a focus of each of the plurality of variable focus areas. Therefore, the eyeglasses can vary in a multifocal mode and a single focus mode.

Description

EYEGLASSES FOR PROVIDING VARIABLE FOCUS

The present disclosure relates to glasses providing a variable focus, and more particularly, to glasses providing a monofocal mode and a multifocal mode.

Presbyopia refers to a gradual decrease in the accommodative power of the lens around the age of 40 or 45. As the elasticity of the lens decreases or the lens becomes enlarged, the near vision range is reduced, making it difficult to see objects located at close range. Accordingly, when reading, at rest, or the like, fatigue is felt.

Conventional lenses used for vision correction include one or more fixed focusing magnifications. For example, a person with presbyopia in which the lens of the eye loses elasticity and close focusing is impaired uses an ophthalmic device that provides different fixed magnifications for near and far vision. A lens with a fixed focusing magnification limits the vision correction potential of the lens to a standard magnification and position within the lens.

For vision correction, monofocal lenses, bifocal lenses, and multifocal lenses are used. A single-focal lens is a lens that corrects only a short distance or a distance, and it is inconvenient for a user to change and wear glasses corresponding to each distance. Bifocal lenses can compensate for far and near. Bifocal lenses vary the refractive index of a specific area of the lens, so that the wearer can see near and far depending on the position of the wearer's gaze, but since the peripheral part of the gaze is not corrected, the wearer easily feels fatigue and adjusts the position of the gaze or , there is the inconvenience of having to fix the glasses and wear them. In addition, bifocal lenses may cause dizziness when going down stairs or looking at a distant place, and an image jump phenomenon may appear, and there is a problem in appearance due to the boundary between the near part and the far part. A multifocal lens is a lens that includes a progressive part for near vision and less dizziness than a bifocal lens, and can see near, intermediate, and far distances through continuous refractive index change from far to near. However, multifocal lenses have multiple dioptric powers overlapped on a narrow lens area, so the progressive and near areas are narrow. , the progressive band used for specifying the intermediate distance is narrow and unstable, making it impossible to use it stably for a long time, and the near field of view is narrow and uncomfortable.

Accordingly, there is a demand for a variable focus lens capable of being variable in a multifocal mode and a single focus mode in order to solve these problems.

Republic of Korea Patent Publication 10-2012-0033696

The present disclosure has been devised in response to the above-described background art, and an object of the present disclosure is to provide spectacles having a variable focus lens that can be varied in a multifocal mode and a single focus mode.

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

The present disclosure has been devised in response to the above-described background art, and an object of the present disclosure is to provide glasses that provide variable focus. The variable focus glasses may include: a lens having a liquid crystal layer including a first variable focus area and a second variable focus area; a frame coupled to a portion of the lens to fix the lens, and having a shape that can be worn by a user of the glasses; a control unit for varying a focus of each of the plurality of variable focus areas; may include.

In addition, the control unit: when receiving a multifocal mode command, controls the focus of the first variable focus region and the second variable focus region to be different from each other, and when receiving a short focus mode command, the first variable focus region The focus of the region and the second variable focus region may be controlled to be the same.

Also, in the liquid crystal layer, a corridor in which the first variable focus area and the second variable focus area overlap may be formed.

The technical solutions obtainable in the present disclosure are not limited to the above-mentioned solutions, and other solutions that are not mentioned are clearly to those of ordinary skill in the art to which the present disclosure belongs from the description below. can be understood

According to some embodiments of the present disclosure, it is possible to provide spectacles provided with a variable focus lens that can be varied in a multifocal mode and a single focus mode.

Effects obtainable in the present disclosure are not limited to the above-mentioned effects, and other effects not mentioned will be clearly understood by those of ordinary skill in the art to which the present disclosure belongs from the description below. .

Various aspects are now described with reference to the drawings, in which like reference numbers are used to refer to like elements collectively. In the following examples, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of one or more aspects. It will be evident, however, that such aspect(s) may be practiced without these specific details. In other instances, well-known structures and devices are shown in block diagram form in order to facilitate describing one or more aspects.
1 is a block diagram of glasses providing variable focus according to a first embodiment of the present invention.
2 is a block diagram of glasses providing variable focus according to a second embodiment of the present invention.
3 is a perspective view of glasses providing variable focus according to the first embodiment of the present invention.
4A is a side cross-sectional view of a lens of eyeglasses providing variable focus according to a first embodiment of the present invention.
4B is a side cross-sectional view in which a voltage is applied to a lens of eyeglasses providing a variable focus according to the first embodiment of the present invention.
5A is a side cross-sectional view of a lens of eyeglasses providing a variable focus according to a second embodiment of the present invention.
5B is a side cross-sectional view in which a voltage is applied to a lens of eyeglasses providing a variable focus according to a second embodiment of the present invention.
6A is a diagram illustrating an example in which a nanostructure is positioned in a lens of glasses providing a variable focus according to the first embodiment of the present invention.
6B is a diagram illustrating an example in which a nanostructure is positioned in a lens of glasses providing a variable focus according to a second embodiment of the present invention.
7A is a view illustrating that the lens of eyeglasses according to the second embodiment of the present invention operates to correct farsightedness.
7B is a view illustrating that the lens of glasses according to the second embodiment of the present invention operates to correct myopia.
8 is a view for explaining an example of glasses providing variable focus according to a third embodiment of the present disclosure.

Various embodiments and/or aspects are now disclosed with reference to the drawings. In the following description, for purposes of explanation, numerous specific details are set forth to provide a thorough understanding of one or more aspects. However, it will also be appreciated by one of ordinary skill in the art that such aspect(s) may be practiced without these specific details. The following description and accompanying drawings set forth in detail certain illustrative aspects of one or more aspects. These aspects are illustrative, however, and some of the various methods in principles of various aspects may be employed, and the descriptions set forth are intended to include all such aspects and their equivalents. Specifically, as used herein, “embodiment”, “example”, “aspect”, “exemplary”, etc. is not to be construed as an advantage or advantage of any aspect or design described over other aspects or designs. It may not be.

Hereinafter, the same or similar components are assigned the same reference numerals regardless of reference numerals, and overlapping descriptions thereof will be omitted. In addition, in describing the embodiments disclosed in the present specification, if it is determined that detailed descriptions of related known technologies may obscure the gist of the embodiments disclosed in the present specification, the detailed description thereof will be omitted. In addition, the accompanying drawings are only for easy understanding of the embodiments disclosed in the present specification, and the technical ideas disclosed in the present specification are not limited by the accompanying drawings.

Although first, second, etc. are used to describe various elements or elements, these elements or elements are not limited by these terms, of course. These terms are only used to distinguish one element or component from another. Accordingly, it goes without saying that the first element or component mentioned below may be the second element or component within the spirit of the present invention.

Unless otherwise defined, all terms (including technical and scientific terms) used herein may be used with the meaning commonly understood by those of ordinary skill in the art to which the present invention belongs. In addition, terms defined in a commonly used dictionary are not to be interpreted ideally or excessively unless clearly defined in particular.

In addition, the term “or” is intended to mean an inclusive “or” rather than an exclusive “or.” That is, unless otherwise specified or clear from context, "X employs A or B" is intended to mean one of the natural implicit substitutions. That is, X employs A; X employs B; or when X employs both A and B, "X employs A or B" may apply to either of these cases. It should also be understood that the term “and/or” as used herein refers to and includes all possible combinations of one or more of the listed related items.

Also, the terms "comprises" and/or "comprising" mean that the feature and/or element is present, but excludes the presence or addition of one or more other features, elements, and/or groups thereof. should be understood as not Also, unless otherwise specified or unless the context is clear as to designating a singular form, the singular in the specification and claims should generally be construed to mean "one or more."

When a component is referred to as being “connected” or “connected” to another component, it may be directly connected or connected to the other component, but it is understood that other components may exist in between. it should be On the other hand, when it is said that a certain element is "directly connected" or "directly connected" to another element, it should be understood that no other element is present in the middle.

In addition, as used herein, the terms “information” and “data” may often be used interchangeably.

The suffixes "module" and "part" for the components used in the following description are given or used in consideration of only the ease of writing the specification, and do not have distinct meanings or roles by themselves.

References to an element or layer “on” or “on” another component or layer mean that another layer or other component is directly on, as well as intervening, another component or layer. Including all intervening cases. On the other hand, when a component is referred to as "directly on" or "immediately on", it indicates that another component or layer is not interposed therebetween.

Spatially relative terms "below", "beneath", "lower", "above", "upper", etc. It can be used to easily describe a component or a correlation with other components. Spatially relative terms should be understood as terms including different orientations of the device during use or operation in addition to the orientation shown in the drawings.

For example, when a component shown in the drawing is turned over, a component described as “beneath” or “beneath” of another component may be placed “above” of the other component. can Accordingly, the exemplary term “below” may include both directions below and above. Components may also be oriented in other orientations, and thus spatially relative terms may be interpreted according to orientation.

Objects and effects of the present disclosure, and technical configurations for achieving them will become clear with reference to the embodiments described below in detail in conjunction with the accompanying drawings. In describing the present disclosure, if it is determined that a detailed description of a well-known function or configuration may unnecessarily obscure the subject matter of the present disclosure, the detailed description thereof will be omitted. In addition, the terms to be described later are terms defined in consideration of functions in the present disclosure, which may vary according to intentions or customs of users and operators.

The scope of the method in the claims of the present disclosure is generated by the functions and features described in each step, and unless the precedence of the order is specified in each step constituting the method, the claims The order of description of each step in the range is not affected. For example, in a claim described as a method comprising steps A and B, even if step A is stated before step B, the scope of the rights is not limited that step A must precede step B.

However, the present disclosure is not limited to the embodiments disclosed below and may be implemented in various different forms. Only the present embodiments are provided so that the present disclosure is complete, and to fully inform those of ordinary skill in the art to which the present disclosure belongs, the scope of the disclosure, and the present disclosure is only defined by the scope of the claims . Therefore, the definition should be made based on the content throughout this specification.

1 is a block diagram of glasses providing variable focus according to a first embodiment of the present invention.

The glasses 100 for providing variable focus according to the first embodiment of the present invention include a lens 110 , a user input unit 120 , a distance measurement unit 130 , a control unit 140 , and a first arrangement maintenance module 150 . , a second arrangement maintaining module 160 , a memory unit 170 , a communication unit 180 , and a frame 190 .

The lens 110 according to the first embodiment of the present invention includes a first lens-shaped optical unit 111 , a second lens-shaped optical unit 112 , a liquid crystal layer 113 , a display unit 114 , and a first transparent electrode. 115 , a second transparent electrode 116 , and a nanostructure 117 may be included.

One side of each of the first lens-shaped optical unit 111 and the second lens-shaped optical unit 112 may be disposed in contact with the liquid crystal layer 113 . The lens 110 may have a structure for accommodating the liquid crystal layer 113 as the first lens-shaped optical unit 111 and the second lens-shaped optical unit 112 . The first and second lens-shaped optical units 111 and 112 may have a complementary structure to suppress aberration. For example, when the first lens-shaped optical unit 111 is a concave lens, the second lens-shaped optical unit 112 may have a convex lens shape. In addition, the first and second lens-shaped optical units 111 and 112 may include at least one of a concave lens, a convex lens, and an aspherical lens. In addition, the above-described types of lenses are merely examples, and the first and second lens-shaped optical units 111 and 112 may be formed of lenses having any shape. In addition, first and second transparent electrodes 115 and 116 may be positioned on one side of the first and second lens-shaped optical units 111 and 112 .

The liquid crystal layer 113 may be accommodated in the first and second lens-shaped optical units 111 and 112 . Liquid crystal layer 113 passes through the liquid crystal layer based on the arrangement state of the liquid crystal layer 113 that is changed by the voltage applied to the liquid crystal layer from the first transparent electrode 115 and the second transparent electrode 116 . By allowing the refractive index of the light to change, the focus of the lens can be varied. Accordingly, the glasses according to the first embodiment of the present invention can provide a variable focus, so that the user is not affected by the appearance and can conveniently use the glasses without cumbersome replacement of the glasses. The voltage applied to the liquid crystal layer 113 by the closed curves of the first transparent electrode 115 and the second transparent electrode 116 is the refractive index of the liquid crystal layer 113 and the first and second lens-shaped optics. The deviation of the refractive index of the parts 111 and 112 may be adjusted to increase from the center of the lens toward the outside of the lens 110 . The liquid crystal layer 113 has the same refractive index or similar refractive index to the first and second lens-shaped optical units 111 and 112 in the center of the lens 110 when the glasses 100 operate, but the lens ( At the outside of 110 , a refractive index having a large deviation from the refractive indices of the first and second lens-shaped optical units 111 and 112 may be provided. The liquid crystal layer 113 is composed of a plurality of regions, and the voltage applied to the liquid crystal layer 113 varies the refractive index of the liquid crystal layer according to the position on the lens 110 to suppress aberration. It may be adjusted differently according to the plurality of regions. Although the refractive indices of the first and second lens-shaped optical units 111 and 112 on the lens 110 are constant, when the glasses 100 are operated, the refractive index of the liquid crystal layer 113 is ) may have different refractive indices between the center and the outer portion. This will be described later.

The liquid crystal layer 113 may include at least one of a nematic liquid crystal, a smectic liquid crystal, a ferroelectric liquid crystal, and a chiral liquid crystal. In addition, the liquid crystal layer 113 may include different types of liquid crystals to enable fine diopter control.

The first transparent electrode 115 is composed of one or more closed curves to apply a voltage according to a position on the lens 110 to the liquid crystal layer 113 , and the liquid crystal layer 113 together with the second transparent electrode 116 . ) may be positioned on one side of the first lens-shaped optical unit 111 to apply a voltage in the vertical direction. In addition, the second transparent electrode 116 is composed of one or more closed curves so as to apply a voltage according to a position on the lens 110 to the liquid crystal layer 113 , and the liquid crystal together with the first transparent electrode 115 . It may be positioned on one side of the second lens-shaped optical unit to apply a voltage to the layer 113 in a vertical direction. The first and second transparent electrodes 115 and 116 may have one or more closed curves to apply a voltage according to a position on the lens 110 to the liquid crystal layer 113, and may transmit light. and may be made of an electrically conductive material.

The nanostructure 117 is a moth eye-shaped structure, and may be located on one side of the first lens-shaped optical unit 111 or one side of the second lens-shaped optical unit 112 . The nanostructure 117 may increase a change in refractive index caused by the liquid crystal layer 113 . In addition, the nanostructure 117 may reduce light reflection so that the user of the glasses 100 can see an object more clearly. The nanostructure 117 may reduce the thickness of the liquid crystal layer 113 by reducing light reflection and maximizing a change in refractive index caused by the liquid crystal layer 113 . Therefore, since the overall thickness of the lens 110 can be appropriately configured without being too thick, it is possible to provide the user with the eyeglasses 100 with better appearance.

In addition, a portion of the liquid crystal layer 113 blocks at least a portion of the light passing through the liquid crystal layer 113 to provide a display unit 114 capable of displaying information recognizable by a user of the lens 110 . may include The display unit 114 may block at least a portion of the light passing through the lens 110 by distortion of the liquid crystal particles of the liquid crystal layer 113 , thereby displaying visual information on a portion of the lens 110 .

The user input unit 120 may allow the user to adjust the voltage applied to the liquid crystal in order to change the focus of the glasses according to the distance of the object that the user of the glasses wants to see. The user input unit 120 may include a push button, a touch sensor, and the like, and may include any means capable of detecting a user's input. The user input unit 120 may be disposed on a portion of the frame 190 of the glasses 100 . 3 illustrates that the user input unit 120 protrudes, but the user input unit 120 may be located at a part of the temples. In addition, the user input unit 120 may change the operation mode of the glasses to the distance mode, the intermediate distance mode, or the near mode to change the operation mode of the glasses according to the distance of the object that the user of the glasses wants to see. may be allowed to change. The user may allow the focus of the glasses to be continuously changed through the user input unit 120 or may be discontinuously changed according to a preset mode.

The distance measuring unit 130 may measure a distance to an object that the user of the glasses 100 wants to see. The distance measuring unit 130 may be configured as a laser sensor or an ultrasonic sensor. In addition, the distance measuring unit 130 may include an arbitrary sensor capable of measuring the distance to the object. The distance measuring unit 130 may be located on a part of the frame 190 of the glasses in the direction of the user's gaze.

The controller 140 may adjust the amount of voltage applied to the liquid crystal to change the focus of the glasses 100 based on the distance to the object measured by the distance measuring unit 130 . Also, as described above, the controller 140 may adjust the voltage applied to the liquid crystal layer 113 by the first and second transparent electrodes 115 and 116 . The controller 140 may include one or more microprocessors, and may adjust the voltage applied to the liquid crystal layer 113 to adjust the focal length of the glasses 100 .

The first arrangement maintenance module 150 is configured to prevent a change in refractive index due to the return of the arrangement state of the liquid crystal layer 113 to the original state when the power supply of the glasses 100 is stopped. ) can be maintained. When the power supply of the glasses 100 is stopped, the arrangement state of the liquid crystal layer 113 returns to its original state to prevent the user from feeling uncomfortable due to the change in refractive index. Even when the power supply of the glasses 100 is stopped, the arrangement state of the liquid crystal layer 113 may be maintained. The first arrangement maintenance module 150 supplies DC power to the first and second transparent electrodes 115 and 116 and short-circuits the first and second transparent electrodes to maintain the arrangement state of the liquid crystal layer 113 . can do. For example, when the liquid crystal layer 113 is arranged so that the user can see near the glasses 100, but the power supply is stopped, the arrangement of the liquid crystal layer 113 returns to its original state so that the user can see the near field. In the case where it becomes impossible to see, problems such as dizziness may occur to the user. The first arrangement maintenance module 150 may solve this problem by maintaining the arrangement state of the liquid crystal layer 113 in the last state.

The second arrangement maintenance module 160 may return the arrangement state of the liquid crystal layer 113 to a preset state when the power supply of the glasses 100 is stopped. The first and second alignment maintenance modules 150 and 160 apply a magnetic field to the liquid crystal with a permanent magnet, etc. to maintain the alignment state of the liquid crystal (the first alignment maintenance module 150), or set the arrangement state of the liquid crystal to a preset state. It is possible to return to (the second arrangement maintaining module 160). In addition, the first and second arrangement maintenance modules 150 and 160 apply an electric field, magnetic field temperature, stress, etc. to the liquid crystal layer 113 to maintain the arrangement state of the liquid crystal layer 113, or can be brought back to the state.

The memory unit 170 is the focus of the lens based on the voltage applied to the liquid crystal layer, the amount of distortion of the liquid crystal layer, the orientation, the type of the liquid crystal layer, the refractive index of light passing through the liquid crystal layer, and the state of the liquid crystal layer. At least one of a distance and a visual acuity of a user of the lens may be recorded. The recorded information may be used to implement a database including the distance between the user's eyesight and the object, and the amount of voltage for correcting it. The memory unit 170 includes a flash memory type, a hard disk type, a multimedia card micro type, and a card type memory (eg, SD or XD memory). , Random Access Memory (RAM), Static Random Access Memory (SRAM), Read-Only Memory (ROM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Programmable Read-Only Memory (PROM), Magnetic Memory , a magnetic disk, and an optical disk may include at least one type of storage medium. The above-described storage medium is merely an example, and the memory unit 170 may include various temporary or permanent storage media.

The communication unit 180 may transmit data recorded in the memory unit 170 to the external computing device so that the external computing device generates a database related to vision correction. The communication unit 180 may communicate with an external computing device through wired/wireless communication. As wireless Internet technologies, wireless LAN (WLAN) (Wi-Fi), wireless broadband (Wibro), World Interoperability for Microwave Access (Wimax), High Speed Downlink Packet Access (HSDPA), etc. may be used. As the wired Internet technology, Digital Subscriber Line (XDSL), Fibers to the home (FTTH), Power Line Communication (PLC), or the like may be used. In addition, the communication unit 180 may include a short-range communication module to transmit/receive data to and from an external computing device located in a relatively short distance from the glasses 100 and including the short-distance communication module. Bluetooth, Radio Frequency Identification (RFID), Infrared Data Association (IrDA), Ultra Wideband (UWB), ZigBee, etc. may be used as short range communication technologies. In addition, the communication unit 180 may include a communication means such as a universal serial bus (USB), Thunderbolt, SATA, mSATA, PCI, and the like. External device user terminal, PC (personal computer), notebook (note book), mobile terminal (mobile terminal), smart phone (smart phone), tablet PC (tablet pc), main frame computer, medium-sized computer, large computer , a server, and the like, and may include all types of terminals capable of accessing a wired/wireless network.

The frame 190 may be coupled to a portion of the lens 110 to fix the lens 110 , and may have a shape that can be worn by the user of the glasses 100 . In addition, the user input unit 120 , the distance measuring unit 130 , the control unit 140 , the memory unit 170 , the communication unit 180 , and the like may be located in the frame 190 .

2 is a block diagram of glasses providing variable focus according to a second embodiment of the present invention.

The glasses 200 for providing variable focus according to the second embodiment of the present invention include a lens 210 , a user input unit 220 , a distance measurement unit 230 , a control unit 240 , and a first arrangement maintaining module 250 . , a second arrangement maintaining module 260 , a memory unit 270 , a communication unit 280 , and a frame 290 .

The lens 210 according to the second embodiment of the present invention includes a first lens-shaped optical unit 211 , a second lens-shaped optical unit 212 , a liquid crystal layer 213 , a display unit 214 , and a transparent electrode 215 . , and a nanostructure 217 .

The user input unit 220, the distance measuring unit 230, the control unit 240, the first arrangement maintaining module 250, and the second arrangement maintaining of the glasses 200 providing variable focus according to another embodiment of the present invention. The module 260 , the memory unit 270 , the communication unit 280 , and the frame 290 are the user input unit 120 and the distance measuring unit of the glasses 100 providing variable focus according to the first embodiment of the present invention. 130 , the control unit 140 , the first arrangement maintaining module 150 , the second arrangement maintaining module 160 , the memory unit 170 , the communication unit 180 , and the frame 190 are the same as, and therefore the description thereof is given below. according to the above.

The first and second lens-shaped optical units 211 and 212, the display unit 214, and the nanostructure 217 have the first and second lens shapes of the lens 110 according to the first embodiment of the present invention. The optical units 111 and 112, the display unit 114, and the nanostructure 117 are the same, and the description thereof is as described above.

The liquid crystal layer 213 may be accommodated in the first and second lens-shaped optical units 211 and 212 . The liquid crystal layer 213 has a refractive index of light passing through the liquid crystal layer based on the arrangement state of the liquid crystal layer 213 that is changed by the voltage applied between the closed curves of the transparent electrode 215 to the liquid crystal layer. By allowing it to change, the focus of the lens 210 can be varied. Accordingly, the glasses according to the second embodiment of the present invention can provide a variable focus, so that the user can conveniently use the glasses without being affected by the appearance and without having to change the glasses in a cumbersome manner. The voltage applied between the closed curves of the transparent electrode 215 is the difference between the refractive index of the liquid crystal layer 213 and the refractive index of the first and second lens-shaped optical units 111 and 112 at the center of the lens 210 . The lens 210 may be adjusted so as to increase toward the outside of the lens 210 . A voltage is applied to the liquid crystal layer 213 in a direction parallel to the liquid crystal layer 213 by a voltage applied between the closed curves of the transparent electrode 215 . The liquid crystal layer 213 has a refractive index identical to or similar to that of the first and second lens-shaped optical units 211 and 212 at the center of the lens 210 when the glasses 200 operate, but the lens ( At the outer edge of the 210 , a refractive index having a large deviation from the refractive indices of the first and second lens-shaped optical units 211 and 212 may be provided. The liquid crystal layer 213 is composed of a plurality of regions, and the voltage applied to the liquid crystal layer 213 varies the refractive index of the liquid crystal layer according to the position on the lens 210 to suppress aberration. It may be adjusted differently according to the plurality of regions. Although the refractive indices of the first and second lens-shaped optical units 211 and 212 on the lens 210 are constant, when the glasses 200 operate, the refractive indices of the liquid crystal layer 213 are ) may have different refractive indices between the center and the outer portion. This will be described later.

Also, as described above, the liquid crystal layer 213 may include at least one of a nematic liquid crystal, a smectic liquid crystal, a ferroelectric liquid crystal, and a chiral liquid crystal. In addition, the liquid crystal layer 213 may include different types of liquid crystals to enable fine diopter control.

The transparent electrode 215 is composed of one or more closed curves or a plurality of closed curves so as to apply a voltage according to a position on the lens 210 to the liquid crystal layer 213, and a different voltage is applied to each of the closed curves. A voltage is applied between the closed curves, so that a voltage may be applied in the horizontal direction of the liquid crystal layer 213 . The transparent electrode 215 may be positioned on one side of the first lens-shaped optical unit 211 or the second lens-shaped optical unit 212 so as to be in contact with one side of the liquid crystal layer 213 . 5A, 5B, 6B, 7A, and 7B, the transparent electrode 215 is illustrated as being positioned on one side of the second lens-shaped optical unit 212, but this is only an example, and the transparent electrode 215 is It may be located on one axial surface of the first lens-shaped optical unit 211 .

3 is a perspective view of glasses providing variable focus according to a first embodiment of the present invention.

3 is a perspective view illustrating an example of the external appearance of glasses 100 providing variable focus according to the first embodiment of the present invention. The spectacles 200 providing variable focus according to the second embodiment of the present invention have the same appearance as the spectacles 100 according to the first embodiment.

Glasses 100 for providing variable focus according to an embodiment of the present invention fix a lens, a frame 190 that can be worn by a user, a lens 110 fixed to the frame, and a user input unit that can be positioned on the frame 120 , a distance measuring unit 130 , a memory unit 170 , and a communication unit 180 may be included.

The lens 110 may accommodate the liquid crystal layer 113 . A liquid crystal layer 113 may be positioned on a portion of the lens 110 . In addition, transparent electrodes 115 and 116 for applying a voltage to the liquid crystal layer 113 may be positioned on the lens 110 . Although only the first transparent electrode 115 is displayed in the example of FIG. 3 , the second transparent electrode 116 may be located on one side of the second lens-shaped optical unit 112 of the lens 110 .

In addition, the lens 110 may include a display unit 114 including visual information that can be recognized by the wearer of the glasses 100 by the liquid crystal layer 113 . The display unit 114 may be positioned in a portion of the lens 110 , and may be positioned in a portion of an area occupied by the liquid crystal layer 113 in the lens.

The user input unit 120 is located on the side of the glasses 100 so that the user of the glasses 100 can easily operate them. The distance measuring unit 130 may be positioned to face the front, and may measure a distance to an object viewed by the user's gaze of the glasses 100 .

Although not shown in FIG. 3 , the communication unit 180 may also be located in the frame 190 of the glasses 100 . A user may connect a cable to the communication unit 180 so that the computing device and the glasses 100 communicate. The communication unit 180 may include a structure capable of accommodating a cable for this purpose. Also, the communication unit 180 may be configured as a wireless communication means, and in this case, it may not include a structure capable of accommodating a cable.

4A is a side cross-sectional view of a lens of eyeglasses providing variable focus according to a first embodiment of the present invention.

4B is a side cross-sectional view in which a voltage is applied to a lens of eyeglasses providing a variable focus according to the first embodiment of the present invention.

The lens 110 includes a first lens-shaped optical unit 111 , a second lens-shaped optical unit 112 , and a liquid crystal layer 113 accommodated in the lens-shaped optical units, and first and second transparent electrodes for driving the liquid crystal (115, 116).

Since no voltage is applied to the liquid crystal layer 113 in FIG. 4A , the liquid crystal particles of the liquid crystal layer 113 may be aligned without distortion. In FIG. 4B , a voltage is applied to the liquid crystal layer 113 in the vertical direction in the longitudinal direction of the liquid crystal layer 113 by the first transparent electrode 115 and the second transparent electrode 116 . _{Voltages V 0} , V _m , and V _c may be applied by each of the closed curves of the first and second transparent electrodes 115 and 116 . Glasses 100 according to an embodiment of the present invention apply different voltages depending on the position on the lens 110 to the liquid crystal layer 113 by the transparent electrodes 115 and 116 configured with one or more closed curves. can FIG. 4B is _{an example to which a voltage of V c} < V _m < V ₀ is applied, and among the liquid crystal particles of the liquid crystal layer 113 , liquid crystal particles positioned outside the lens 110 may be distorted the most. In the glasses 100 providing variable focus according to an embodiment of the present invention, the voltage applied to the liquid crystal layer 113 according to the position on the lens 110 as in the example of FIG. 4B on the liquid crystal layer 113 . This may be different. Accordingly, the distortion of the particles of the liquid crystal layer 113 may be different depending on the position on the lens 110 , and the refractive index of the liquid crystal layer 113 may be different depending on the position on the lens 110 . can Therefore, the glasses 100 according to an embodiment of the present invention vary the refractive index of the liquid crystal layer 113 according to the position on the lens 110 , so that aberrations that may occur in the glasses 100 providing variable focus. to provide a clearer image to the user and reduce user fatigue.

5A is a side cross-sectional view of a lens of eyeglasses providing variable focus according to a second embodiment of the present invention.

5B is a side cross-sectional view in which a voltage is applied to a lens of eyeglasses providing variable focus according to a second embodiment of the present invention.

The lens 110 includes a first lens-shaped optical unit 211 , a second lens-shaped optical unit 212 , and a liquid crystal layer 213 accommodated in the lens-shaped optical units and a transparent electrode 215 for driving the liquid crystal. can do.

Since no voltage is applied to the liquid crystal layer 213 in FIG. 5A , the liquid crystal particles of the liquid crystal layer 213 may be aligned without distortion. In FIG. 5B , a voltage is applied to the liquid crystal layer 213 in a direction parallel to the longitudinal direction of the liquid crystal layer 213 by the transparent electrode 215, for example, by the closed curves of the transparent electrode 215. A voltage may be applied between the closed curves. In the glasses 200 according to the second embodiment of the present invention, different voltages may be applied to the liquid crystal layer 213 depending on the position on the lens 210 by the transparent electrode 215 having a plurality of closed curves. . FIG. 5B _{illustrates an example in which a voltage of V 0} > V _c is applied. Among the liquid crystal particles of the liquid crystal layer 213 , liquid crystal particles positioned outside the lens 210 may be distorted the most. In the glasses 200 providing variable focus according to an embodiment of the present invention, the voltage applied to the liquid crystal layer 213 according to the position on the lens 210 as in the example of FIG. 5B on the liquid crystal layer 213 . This may be different. Accordingly, the distortion of the particles of the liquid crystal layer 213 may be different depending on the position on the lens 210 , and the refractive index of the liquid crystal layer 213 may be different depending on the position on the lens 210 . can Therefore, the glasses 200 according to an embodiment of the present invention vary the refractive index of the liquid crystal layer 213 according to the position on the lens 210 , so that aberrations that may occur in the glasses 200 providing variable focus. to provide a clearer image to the user and reduce user fatigue.

6A is a diagram illustrating an example in which a nanostructure is positioned in a lens of glasses providing a variable focus according to the first embodiment of the present invention.

6B is a diagram illustrating an example in which a nanostructure is positioned in a lens of glasses providing a variable focus according to a second embodiment of the present invention.

The nanostructures 117 and 217 are structures in the form of moth eyes, and are one side of the first lens-shaped optical units 111 and 211 or one side of the second lens-shaped optical units 112 and 212 . can be located in The nanostructures 117 and 217 may increase a change in refractive index caused by the liquid crystal layers 113 and 213 . In addition, the nanostructures 117 and 217 reduce light reflection, so that the user of the glasses 100 and 200 can see objects more clearly. The nanostructures 117 and 217 reduce light reflection to maximize the change in refractive index caused by the liquid crystal layers 113 and 213 to reduce the thickness of the liquid crystal layers 113 and 213 . Therefore, since the overall thickness of the lenses 110 and 210 can be appropriately configured without being too thick, it is possible to provide the user with the eyeglasses 100 and 200 with better external appearance.

7A is a view illustrating that the lens of eyeglasses according to the second embodiment of the present invention is operated to correct farsightedness.

The example shown in FIG. 7A is for the second embodiment of the present invention, but the glasses 100 according to the first embodiment of the present invention can also correct farsightedness in the same way.

In the example shown in FIG. 7A , the first lens-shaped optical unit 211 and the second lens-shaped optical unit 212 of the spectacles 200 are illustrated as convex lenses having a property of condensing light, but the present invention The glasses 200 including the liquid crystal layer 213 for providing variable focus according to the embodiment may operate in a corresponding manner for a concave lens or an aspherical lens.

When a voltage is applied to the liquid crystal layer 213 , the light collecting characteristics of the first and second lens-shaped optical units 211 and 212 may be reduced as the voltage applied to the liquid crystal layer 213 increases. In hyperopia, the image is located behind the retina in the eye, and since the image must be located on the retina using glasses, etc., the image forming position must be pulled forward from the current state. To this end, the voltage applied to the liquid crystal layer 213 is weakly applied as the position on the lens 210 is outward, and the refractive index increases _{as the position on the lens 210 is outward (the region to which V 0 is applied in the example of FIG. 7A ).} This should be large. _{Accordingly, a stronger voltage (V 0} < V _m < V _c ) may be applied from the transparent electrode 215 toward the center on the lens 210 . Accordingly, the liquid crystal particles of the liquid crystal layer 213 positioned at the outer edge of the lens 210 are distorted the least, and the refractive index of the liquid crystal layer 213 is greatest at the outer edge of the lens 210 . Assuming that the refractive index n1 of the first lens-shaped optical unit 211 is constant depending on the position on the lens 210, the refractive index of the liquid crystal is the lowest in the center and increases toward the outside (n _c < n ₀ ) can do. _{Assuming that the refractive index n c} of the central portion of the liquid crystal layer 213 is the same as the refractive index of the first lens-shaped optical unit 211 , the refractive index of the liquid crystal layer 213 and the first lens-shaped optical unit 211 . The deviation of ? increases from the center of the lens 210 toward the outside. In this way, by varying the voltage applied to the liquid crystal layer 213 according to a position on the lens 210 , the refractive index of the liquid crystal layer 213 can be changed to eliminate aberration. In the example of FIG. 7A , the refractive index n _{2 of the second lens-shaped optical unit 212 is the same as the refractive index n 1} of the first lens-shaped optical unit 211 , but may be different. The refractive index of the first lens-shaped optical unit 211 has been described as the same depending on the position on the lens 210, but may be different, and the refractive index of the liquid crystal layer 213 is the first and second lenses in order to eliminate aberration. The deviation from the refractive index of the shape optical unit may be controlled to increase from the center of the lens 210 to the outside. The glasses 200 according to the embodiment of the present invention operate by applying a voltage to the liquid crystal layer 213 , so that the light collecting characteristic is strengthened compared to when the liquid crystal layer 213 does not operate. Farsightedness can be corrected by pulling the image on the user's retina to the retina.

7B is a view illustrating that the lens of glasses according to the second embodiment of the present invention is operated to correct myopia.

The example shown in FIG. 7B is for the second embodiment of the present invention, but the glasses 100 according to the first embodiment of the present invention can also correct myopia in the same manner.

In the example shown in FIG. 7B , the first lens-shaped optical unit 211 and the second lens-shaped optical unit 212 of the spectacles 200 are illustrated as convex lenses having a characteristic of condensing light. The glasses 200 including the liquid crystal layer 213 for providing variable focus according to the embodiment may operate in a corresponding manner for a concave lens or an aspherical lens.

When a voltage is applied to the liquid crystal layer 213 , as the voltage applied to the liquid crystal layer 213 increases, the light collecting characteristics of the first and second lens-shaped optical units 211 and 212 may be reduced. In myopia, the image is located in front of the retina in the eye, and since the image must be located on the retina by using glasses, etc., the image forming position must be pushed to the rear of the current state. To this end, the voltage applied to the liquid crystal layer 213 is strongly applied as the position on the lens 210 is outward, and the refractive index increases _{as the position on the lens 210 is outward (the region to which V 0 is applied in the example of FIG. 7B ).} This should be small. _{Accordingly, a stronger voltage (V 0} > V _m > V _c ) may be applied toward the outside on the lens 210 by the transparent electrode 215 . Accordingly, the liquid crystal particles of the liquid crystal layer 213 positioned on the outside of the lens 210 are most distorted, and the refractive index of the liquid crystal layer 213 is the smallest at the outside of the lens 210 . _{Assuming that the refractive index n 1} of the first lens-shaped optical unit 211 is constant depending on the position on the lens 210, the refractive index of the liquid crystal is the lowest at the center and decreases toward the outside (n _c > n _{0 )} )can do. _{Assuming that the refractive index n c} of the central portion of the liquid crystal layer 213 is the same as the refractive index of the first lens-shaped optical unit 211 , the refractive index of the liquid crystal layer 213 and the first lens-shaped optical unit 211 . The deviation of ? increases from the center of the lens 210 toward the outside. In this way, by varying the voltage applied to the liquid crystal layer 213 according to a position on the lens 210 , the refractive index of the liquid crystal layer 213 can be changed to eliminate aberration. In the example of FIG. 7B , the refractive index n _{2 of the second lens-shaped optical unit 212 is the same as the refractive index n 1} of the first lens-shaped optical unit 211 , but may be different. The refractive index of the first lens-shaped optical unit 211 has been described as the same depending on the position on the lens 210, but may be different, and the refractive index of the liquid crystal layer 213 is the first and second lenses in order to eliminate aberration. The deviation from the refractive index of the shape optical unit may be controlled to increase from the center of the lens 210 to the outside. The glasses 200 according to the embodiment of the present invention operate by applying a voltage to the liquid crystal layer 213 , so that the light collecting characteristic is weakened compared to when the liquid crystal layer 213 does not operate, so that the Myopia can be corrected by pushing the image on the user to the retina.

8 is a view for explaining an example of glasses providing variable focus according to a third embodiment of the present disclosure.

Referring to FIG. 8 , the glasses providing variable focus may include a lens 300 , a frame (not shown), and a controller (not shown). However, since the above-described components are not essential to implement the glasses providing the variable focus, the glasses providing the variable focus may have more or fewer components than those listed above. In addition, the frame and the control unit may be the same as or correspond to the frame and the control unit described in the first and second embodiments described above.

The lens 300 according to the third embodiment of the present invention may include a first variable focus area 310 , a second variable focus area 320 , a corridor 330 , and a liquid crystal layer (not shown). can However, the present invention is not limited thereto.

The first variable focus area 310 may provide multifocals under the control of the controller.

Specifically, when receiving a multifocal mode command from the controller, the first variable focus area 310 may provide a focus different from that of the second variable focus area 320 . However, the present invention is not limited thereto.

Meanwhile, according to some embodiments of the present disclosure, when receiving a short focus mode command from the controller, the first variable focus area 310 may provide the same focus as that of the second variable focus area 320 . However, the present invention is not limited thereto.

The second variable focus area 320 may provide a short focus under the control of the controller. However, the present invention is not limited thereto.

The liquid crystal layer may be accommodated in the lens 300 .

For example, the liquid crystal layer allows the refractive index of light passing through the liquid crystal layer to change based on a signal from the controller, thereby making the focus of the lens 300 variable. However, the present invention is not limited thereto.

The curry diagram 330 may be formed in a region where the first variable focus region 310 and the second variable focus region 320 of the liquid crystal layer overlap. Here, the curry degree 330 may be an area for reducing dizziness that may be caused by a difference in frequency as the user's gaze moves from the first variable focus area 310 to the second variable focus area 320 . have. However, the present invention is not limited thereto.

Meanwhile, the frame may be coupled to a part of the lens 300 to fix the lens. In addition, the frame may have a shape that can be worn by a user of the glasses. However, the present invention is not limited thereto.

The controller may vary the focus of each of the plurality of variable focus areas.

For example, when receiving the multifocal mode command, the controller may control the focus of the first variable focus area 310 and the second variable focus area 320 to be different from each other.

As another example, when receiving the short focus mode command, the controller may control the first variable focus area 310 and the second variable focus area 320 to have the same focus. However, the present invention is not limited thereto.

According to the above-described configuration, the glasses providing variable focus can provide a multifocal area and a monofocal area.

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 readily 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 is not intended to be limited to the embodiments presented herein, but is to be construed in the widest scope consistent with the principles and novel features presented herein.

Claims (3)

In the glasses providing variable focus,
a lens having a liquid crystal layer including a first variable focus region and a second variable focus region;
a frame coupled to a portion of the lens to fix the lens, and having a shape that can be worn by a user of the glasses; and
a control unit for varying a focus of each of the plurality of variable focus areas;
containing,
Glasses with variable focus.
The method of claim 1,
The control unit is:
When receiving a multifocal mode command, controlling the focus of the first variable focus area and the second variable focus area to be different from each other; and
controlling the first variable focus area and the second variable focus area to have the same focus when receiving a short focus mode command;
Glasses with variable focus.
The method of claim 1,
wherein the liquid crystal layer has a corridor in which the first variable focus area and the second variable focus area overlap;
Glasses with variable focus.

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