KR20180074873A - Focusble fluid lens - Google Patents

Abstract

The present invention discloses a focus-variable lens including: a lens part having a focal length adjusted by a tensile force or a compressive force applied to an outer periphery of the lens part; and a soft actuator having a twist and a coil ring so that a fiber that shrinks or expands during heating or cooling extends or compresses the outer periphery of the lens part to change a surface curvature of the lens part. The present invention relates to an apparatus for providing an optimized focal length to a user, and discloses a focus-variable lens including: a lens part having a focal length adjusted by a tensile force or a compressive force; and a soft actuator for changing a surface curvature of the lens part through a fiber that shrinks or expands. A structure that is relatively lightweight and easy to be implemented is provided by using the soft actuator utilizing the fiber, and in particular, it is possible to reduce inconvenience of an existing technique in which an amount of a liquid accommodated in an outer film of a lens is adjusted.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a fluid-

The present invention relates to a fluid lens capable of physically changing the bending of a lens to adjust the focal length.

Myopia, myopia, etc. are caused by various factors in the human eye. In addition, as aging progresses in the muscles or accumulates the use of vision, constant changes in the tools to assist the changing vision are required to see the objects that you want to see. On the other hand, in a device using multiple lenses such as a telescope or a microscope, the process of adjusting the focal distance desired by the user through replacement and combination of lenses may cause inconvenience to the user.

In order to solve the above-mentioned problems, an organically focusable device has been developed. The focus adjustment device is a device capable of focusing by moving the eyepiece of the telescope. Basically, a lot of focusing devices such as a rack gear and a pinion gear are attached to the telescope, but the focus adjustment is not easy. To compensate for this, a friction type crayford focuser was prepared.

However, when attaching the heavy equipment to the eyepiece of the telescope for photographing, etc., there is a disadvantage that a strong focusing device is attached considering the weight of the equipment to be attached.

Fluid lenses are a means to overcome these shortcomings. In general, the fluid lens utilizes the electrowetting phenomenon discovered by Gabriel Leafman of France in 1870. Scientists have succeeded in developing liquid lenses by applying electro-wetting phenomena to control the curvature of liquid lens surfaces. The liquid lens thus developed can be applied to an auto focus or zoom function of an optical device such as a camera. Liquid lenses can act as parts of a device, such as a camera, telescope, smart phone, or eyeglass, that replace a conventional bulky lens transfer system.

Meanwhile, Korean Patent Laid-Open No. 10-2013-0020263 (hereinafter referred to as "Prior Art") discloses a focus lens system using an elastic transparent film that mimics the eye structure, &Quot; The prior art is based on the fact that the transparent elastic film and the refraction liquid inside the film cause a spatial volume change due to the motion of the ring-shaped permanent magnet moving in the vertical direction of the coil by using the magnetic force induced in the rotating spiral electromagnet coil through the current Disclosed is an electrically variable fluid optical lens for converting a focal length. However, in the prior art, the film in which the curvature of the surface is changed by the permanent magnet is limited to the upper surface. In addition, the prior art does not imply / suggest a structure in which lenses are arranged in multiple stages to precisely adjust the focus.

Korean Patent Publication No. 10-2013-0020263

SUMMARY OF THE INVENTION It is an object of the present invention to provide a fluid lens which is applied to eyeglasses, optical devices, and the like to adjust the bending according to various situations to provide an optimized focal distance to a user.

According to an aspect of the present invention, there is provided a lens unit comprising: a lens unit having a focal length adjusted by a tensile force or a compressive force applied to an outer periphery; And a soft actuator for forming a twisted and coiled ring so that the fiber contracts or expands upon heating or cooling to tension or compress the outer periphery of the lens portion to change the surface curvature of the lens portion.

Preferably, the soft actuator may comprise a homochiral fiber which is contracted by heating and expanded by cooling, and a unit consisting of heterochiral fibers which are expanded by heating and contracted by cooling.

Preferably, the soft actuator may include a plurality of first actuators, one end of the fibers being connected in a direction perpendicular to an outer circumference of the lens unit, and applying a tensile force or a compressive force in a vertical direction to the outer circumference of the lens unit.

Preferably, the first driver may be disposed in a point-symmetrical manner around the outer periphery of the lens portion.

Preferably, the soft actuator may include a second driver that contacts the lens portion such that the fiber surrounds the rim of the lens portion.

Preferably, the soft actuator further comprises a first driver, one end of which is connected to the outer periphery of the second driver and extends in a normal direction, and a plurality of which are arranged in a point-symmetrical manner, And a tensile force or a compressive force can be applied to the lens portion and the first driver when they are cooled and expanded or shrunk.

Preferably, the soft actuator further includes a second driver that contacts the lens unit so as to surround the rim of the lens unit, wherein the first driver has a structure in which one end of the fiber is oriented in a direction perpendicular to the outer circumference of the second driver So that a tensile force or a compressive force can be applied in a direction perpendicular to the outer circumference of the second driver.

Preferably, the second driver is operated in a complementary manner to the first driver, and the lens unit can transmit the tensile force or the compressive force exerted by the plurality of first drivers evenly around the outer periphery.

Preferably, the focus variable lens according to the present invention further includes a frame connected to the other end of the fibers included in the first driver, and spaced apart from the lens unit by an interval longer than the length of the first driver.

Preferably, the frame includes a conductive material to deliver current or thermal energy to the soft actuator.

Preferably, the focus variable lens according to the present invention may further include a sensor unit for measuring a driving range of the soft actuator to set a focal distance of the lens unit.

Preferably, the focus variable lens according to the present invention may further include a controller for controlling a current applied to the soft actuator to adjust the degree of shrinkage or expansion of the soft actuator.

According to the present invention there is provided an apparatus for providing an optimized focal length to a user, comprising: a lens portion having a focal length adjusted by a tensile force or a compressive force; and a soft actuator for changing a surface curvature of the lens portion through shrinkable or expanding fibers. The lens is started. It is possible to provide a structure that is relatively light and easy to implement by using the soft actuator using the above-mentioned fibers, and in particular, it can reduce the hassle of the existing technology for controlling the amount of liquid contained in the lens outer film.

In addition, the arrangement direction of the soft actuator is fixed in the lateral direction of the lens, so that the volume required for lens implementation for focus adjustment can be reduced.

1 shows a focus variable lens according to an embodiment of the present invention.
2 is a side view of a focus variable lens according to an embodiment of the present invention.
FIG. 3 shows twisting of fibers constituting a soft actuator according to an embodiment of the present invention.
4 shows a coil ring of fibers constituting a soft actuator according to an embodiment of the present invention.
5 shows a homochiral fiber constituting a soft actuator according to an embodiment of the present invention.
Figure 6 shows a heterochiral fiber constituting a soft actuator according to an embodiment of the present invention.
7 is a view illustrating an example of a unit body constituting a soft actuator according to an embodiment of the present invention.
8 is another exemplary view of a unit body constituting the soft actuator according to the embodiment of the present invention.
Figure 9 is a schematic view of a focus variable lens according to an embodiment of the present invention.
10 shows the principle of operation of the annular actuator according to the embodiment of the present invention.
11 shows a focus variable lens provided in a multi-stage according to an embodiment of the present invention.
12 shows a focus variable lens in which a lens according to an embodiment of the present invention is simulated.
13 shows a focus-type lens in the form of a spectacle according to an embodiment of the present invention.
14 shows a thermoelectric device according to an embodiment of the present invention.
15 is a layout diagram of a soft actuator and a thermoelectric device according to an embodiment of the present invention.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to or limited by the exemplary embodiments. Like reference numerals in the drawings denote members performing substantially the same function.

The objects and effects of the present invention can be understood or clarified naturally by the following description, and the purpose and effect of the present invention are not limited by the following description. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

The focus variable lens 1 may include a soft actuator 11, a lens portion 13, a frame 15, a control portion 17, and a sensor portion 19. [ Fig. 1 shows a focus-variable lens 1 according to an embodiment of the present invention. 2 is a side view of the focus variable lens 1 according to an embodiment of the present invention.

In this embodiment, the focus variable lens 1 may include a soft actuator 11 composed of fibers. The focus variable lens 1 may be included in glasses, a telescope, a microscope or the like. The soft actuator 11 is formed with a twist and a coil ring so that the fiber that shrinks or expands upon heating or cooling can stretch or compress the outer periphery of the lens portion 13 to change the surface curvature of the lens portion 13.

In this embodiment, the soft actuator 11 can change the focal length of the lens portion 13 by changing the bending of the lens portion 13 through contraction or expansion. The soft actuator 11 may serve as a driver for transmitting an external force for adjusting the focus of the lens unit 13. [

The soft actuator 11 is composed of fibers having twisted and coiled rings formed therein. The soft actuator 11 can adjust the degree of shrinkage or expansion during heating or cooling. The soft actuator 11 can adjust the surface curvature of the lens portion 13 Can be controlled. The twist and coil ring formed in the soft actuator 11 acts as an element for determining the structural characteristics of the soft actuator 11 made of fibers and the driving of the soft actuator 11 through the combination of the fibers having the above- It can be implemented variously.

The soft actuator 11 may comprise a homo-chiral fiber which is contracted by heating and expanded by cooling, and a unitary body 110a or 110b consisting of a heterochiral fiber which is expanded by heating and contracted by cooling.

In this embodiment, the soft actuator 11 may comprise one or more fibers. The soft actuator 11 may comprise both a homochiral or a heterochiral fiber if it comprises a plurality of fibers. In particular, various types in which two fibers composed of a homochiral fiber having a different structure and a heterochiral fiber are arranged can be defined as the unit 110a or 110b.

In this embodiment, the soft actuator 11 may include a first driver 1101 and a second driver 1103. The first driver 1101 may be arranged radially and connected to the lens unit 13. The second driver 1103 may be arranged in an annular shape so as to be in contact with the lens portion 13. The first driver 1101 and the second driver 1103 may be connected to each other.

A plurality of first actuators 1101 may be provided so that one end of the fibers is connected in a direction perpendicular to the outer circumference of the lens portion 13 to exert a tensile force or a compressive force in a direction perpendicular to the outer periphery of the lens portion 13.

In this embodiment, the other end of each first driver 1101 may be fixed to the frame 15. [ Accordingly, the deformation of one end of the first driver 1101 connected to the lens portion 13 can change the surface curvature of the lens portion 13. Further, the plurality of first drivers 1101 can be contracted or expanded at the same time. That is, the first actuator 1101 can change the surface curvature of the lens outer film by applying a tensile force or a compressive force to the plurality of drivers in the normal direction of the lens unit 13.

The first driver 1101 may be disposed in a point-symmetrical manner around the outer periphery of the lens portion 13. [

In this embodiment, the first driver 1101 may be arranged in point symmetry with respect to the proximal portion of the lens portion 13. The first driver 1101 arranged in point symmetry may be simultaneously shrunk or inflated to induce the surface curvature of the lens portion 13 to change at the same rate. In order to increase the effect of the above-described driving, it is preferable that the first drivers 1101 are constituted of a plurality of units.

In the present embodiment, the proximal portion refers to a point that is emitted from the light source and maintains the direction parallel to the optical axis, and travels in parallel without changing the direction in the course of the light incident on the lens portion 13 passing through the lens portion 13 . In the case of a convex lens, the proximal portion may mean the most convex point, and in the case of the concave lens, it may mean the most concave point.

One end of the fiber is connected to the first driver 1101 in a direction perpendicular to the outer circumference of the second driver 1103, and a tensile force or a compressive force can be applied to the outer circumference of the second driver 1103 in the vertical direction.

In this embodiment, the first driver 1101 may be connected at one end to the second driver 1103 which is in contact with the lens unit 13. The first driver 1101 may receive the energy and transmit the energy to the second driver 1103.

One end of the fibers of the first driver 1101 is connected to the outer periphery of the second driver 1103 and extends in the normal direction, and a plurality of fibers may be arranged in a point symmetrical manner.

In this embodiment, a plurality of first actuators 1101 are connected to the second actuators 1103, respectively, so that the first actuators 1101 can contract or expand according to the movement of the second actuators 1103. The first driver 1103 can receive a tensile force or a compressive force applied by the second driver 1103 uniformly by a plurality of drivers.

The second driver 1103 can be brought into contact with the lens portion 13 so that the fiber surrounds the rim of the lens portion 13.

In this embodiment, the second driver 1103 can surround the lens portion 13 and maintain the same shape as the lens outer film. The second driver 1103 may comprise a homochiral or a heterochiral fiber. The second driver 1103 may include a unit body 110a or 110b.

The second driver 1103 may be heated or cooled to apply tensile or compressive force to the lens unit 13 and the first driver 1101 during shrinkage or expansion.

In this embodiment, the first driver 1101 and the second driver 1103 may be complementarily driven. The second driver 1103 can perform complementary driving to assist in precise control of the surface curvature of the lens portion 13 through the first driver 1101. [ The second driver 1103 may apply a core external force to control the surface curvature of the lens unit 13 and the first driver 1101 may apply a complementary external force to the second driver 1103 to assist the second driver 1103. [ Can be driven.

For example, when the second driver 1103 shrinks, the first driver 1101 may expand to deform the surface curvature of the lens portion 13. In addition, when the second actuator 1103 is inflated, the first actuator 1101 may be contracted to deform the surface curvature of the lens outer film.

Fig. 3 shows twisting of the fibers constituting the soft actuator 11 according to the embodiment of the present invention.

Referring to FIG. 3, it can be seen that the fibers constituting the soft actuator 11 according to the present embodiment are primarily twisted. As described above, in the method of imparting kink to the fibers constituting the soft actuator 11, a method of fixing one end and rotating the other end or rotating both ends may be adopted. The direction of twist of the fibers constituting the soft actuator 11 does not affect the driving of the soft actuator 11 by itself, and the characteristics of the fibers are determined by the relationship between the coiling direction and the twist direction, . The diameter and length of the fibers constituting the soft actuator 11 are not limited, and the diameters and lengths of the first driver 1101 and the second driver 1103 may be different from each other.

In the present embodiment, the fibers constituting the soft actuator 11 may be any one selected from the group consisting of nylon, shape memory polyurethane, polyethylene, and rubber. Since the fibers constituting the soft actuator 11 are made of a polymer material, the reversible structure of loosening and twisting of the soft actuator 11 even at a high temperature can be maintained for a long period of time. Further, since the fibers constituting the soft actuator 11 can be changed not only by the heating but also by the cooling, it is possible to provide a reversible rotational motion that returns to the initial twisted form.

Fig. 4 shows a coil ring of fibers constituting the soft actuator 11 according to the embodiment of the present invention.

Referring to FIG. 4, fibers constituting the soft actuator 11 may be provided in a structure in which a form of a coil ring is additionally formed in a twisted state. The direction of the coil ring formed by the fibers constituting the soft actuator 11 may be the same as or different from the direction of the twist of the fibers. The method of applying the coil ring to the fibers constituting the soft actuator 11 is not particularly limited.

For example, the coil ring can be given by fixing one end of the fiber and rotating the other end of the fiber, and the coil ring can be given by winding the pipe with the fiber. Since the fibers have both the twist and the coil ring, the driving force by heating and cooling becomes strong, and the characteristics of the fiber can be changed depending on the direction in which the twist and the coil ring take. The fibers constituting the soft actuator 11 can vary the volume of the fibers through the twist and the coil ring. In this embodiment, the first actuator 1101 and the second actuator 1103 are distinguished from each other based on an aspect in which the volume of the soft actuator 11 is changed by the arrangement of the soft actuator 11 and the lens portion 13 Respectively.

5 shows a homochiral fiber constituting the soft actuator 11 according to the embodiment of the present invention.

Referring to FIG. 5, it can be seen that the homokiral fiber refers to fibers having the same twist direction and coiling direction. Homochiral fibers shrink as they heat up and can expand as they cool. The first driver 1101 or the second driver 1103 may comprise a homochiral fiber.

Figure 6 shows a heterochiral fiber constituting a soft actuator 11 according to an embodiment of the present invention.

Referring to FIG. 6, it can be seen that the heterochiral fiber refers to a fiber when the direction of twist is opposite to that of the direction of coiling. Heterocyclic fibers can be driven in opposition to homochiral fibers. Heterocyclic fibers can expand when heated and shrink when cooled. The first driver 1101 or the second driver 1103 may comprise a heterochiral fiber.

In this embodiment, the lens portion 13 can be provided as a fluid type lens which can change the focal distance by an external force. The fluid lens may include a lens outer film and a liquid lens accommodated in the lens outer film and refracting the transmitted light. The lens portion 13 may be provided with a convex lens or a concave lens. On the other hand, the lens portion 13 may be provided in a form including sol or gel-like fluid. Further, it can be provided as a material having flexibility properties such as a polymer or silicon. As described above, the lens unit 13 is provided with a material including flexibility, and the state of the lens unit 13 is not limited to solid, liquid, and gas, and may be applied to any state of the material in which the refractive index can be changed by an external force.

The focal length of the lens portion 13 can be adjusted by the tensile force or the compressive force applied to the outer periphery.

In this embodiment, the lens unit 13 can receive external force by the first driver 1101 or the second driver 1103. [ Depending on the type of external force applied, the lens unit 13 can change the surface curvature in a direction in which the distance of the lens outer film located in the proximal portion is reduced or increased. Accordingly, the fixed shape of the liquid lens accommodated in the lens outer film can be changed, and as a result, the focal length of the lens portion 13 can be changed.

The lens unit 13 can transmit the tensile force or the compressive force exerted by the plurality of first actuators 1101 evenly around the outer periphery.

In this embodiment, the lens unit 13 can receive tensile force or compressive force simultaneously in the plurality of first actuators 1101 arranged in point symmetry about the proximal portion. The external force transmitted at the same time is uniformly transmitted to the outer periphery of the lens portion 13, and the surface curvature of the lens outer film can be changed at the same ratio.

The frame 15 is connected to the other end of the fiber included in the first driver 1101 and may be disposed apart from the lens unit 13 at an interval equal to or longer than the length of the first driver 1101.

In this embodiment, the frame 15 may be connected to the other end of the fiber included in the first driver 1101. [ The frame 15 does not undergo physical deformation or position change due to a compressive force or a tensile force generated in the first driver 1101 and one end of the first driver 1101 connected to the lens unit 13 is moved in the longitudinal direction As shown in Fig.

The frame 15 may include a conductive material to deliver current or thermal energy to the soft actuator 11.

In this embodiment, the frame 15 may include a conductive material for transferring energy to apply an electric current to the soft actuator 11. Alternatively, in another embodiment, the frame 15 may function as a ground when the soft actuator 11 is energized with a separate conductor.

The conductive material contained in the frame 15 may transmit heat or electricity to the first driver 1101. [ Each first driver 1101 receiving energy from the frame 15 may implement driving corresponding to the stimulus.

The sensor unit 19 can measure the driving range of the soft actuator 11 to set the focal distance of the lens unit 13. [

In this embodiment, the sensor unit 19 may be provided for measuring a proper focal length of the lens unit 13. [ The sensor unit 19 can measure the focal length of the lens through the drive range of the soft actuator 11. [

 The sensor unit 19 may transmit information related to the measured focal length to the controller 17. The sensor unit 19 can collect information on the focal length of the plurality of lens units 13 individually. In another embodiment, the sensor unit 19 can measure a distance between the frame 15 and the lens unit 13, which is variable by tension or contraction of the first driver 1011. [ The control unit 17 receives the distance information between the frame 15 and the lens unit 13 and can calculate the focal length of the lens from the distance information.

The controller 17 controls the current applied to the soft actuator 11 to control the degree of contraction or expansion of the soft actuator 11.

In this embodiment, the control unit 17 can collect information on the focal distance measured and transmitted by the sensor unit 19. The control unit 17 can control the current applied to the first driver 1101 or the second driver 1103 connected to the lens unit 13 connected to the frame 15 based on the collected information. Accordingly, the control unit 17 can adjust the degree to which the soft actuator 11 contracts or expands. The soft actuator 11 whose shrinkage or expansion degree is adjusted can change the surface curvature of the lens outer film. The lens unit 13 changes the curvature of the surface of the lens outer film through the external force transmitted from the soft actuator 11 and changes the accommodating state of the liquid lens accommodated in the lens outer film to change the focal distance measured by the sensor unit 19 Can be reformed.

Hereinafter, an embodiment in which the unit body 110a or 110b constituting the soft actuator 11 and the focus variable lens 1 are applied will be described.

< Example 1 > Unit 1

7 is an exemplary view of a unit body 110a or 110b constituting the soft actuator 11 according to the embodiment of the present invention.

In this embodiment, it is understood that the unit body 110a refers to the arrangement of the homochiral fibers and the heterochiral fibers which are contracted or expanded in the opposite direction when heated or cooled. The unit body 110a may include a first driver 1101 or a second driver 1103. The unit body 110a may connect different energy supply means for independent driving of the homochiral fiber and the heterochiral fiber.

On the other hand, the unit body 110a can implement the same driving of the homochiral fiber and the heterochiral fiber through arrangement with the thermoelectric elements. The unit body 110a may be arranged in various forms with the conductor of the thermoelectric element. The thermoelectric element can heat or cool the conductor when a single current is applied through the arrangement relationship between the semiconductor and the conductor, and the unit body 110a can be made of a thermoelectric material such that the homochiral fiber and the heterochiral fiber are given different stimuli Fibers of different structures can be arranged on the conductor. For example, it is possible to implement a drive in which a homochiral fiber is disposed on a conductor to be heated, and a heterochiral fiber is disposed on the conductor to be cooled, whereby fibers of different structures are contracted at the same time. Conversely, it is possible to implement a drive in which heterochiral fibers are placed on a conductor to be heated and homochiral fibers are placed on the conductor to be cooled so that fibers of different structures are simultaneously expanded. The above-described driving can implement the driving of the contraction and the expansion differently through the arrangement of the conductor and the fiber.

Meanwhile, in order to implement the above-described driving, the unit body 110a may be disposed at a position located above the thermoelectric element. In addition, the unit body 110a may be disposed at a position located below the thermoelectric element. In addition, the unit body 110a may be arranged such that thermoelectric elements are cross-woven. As described above, it is noted that the unit body 110a can be arranged in various forms with the thermoelectric elements, and the arrangement form is not limited to the above-described arrangement.

< Example 2 > Unit 2

8 is another example of the unit body 110b constituting the soft actuator 11 according to the embodiment of the present invention.

The unit body 110b may be configured such that two fibers having different coiling radii are spaced apart. The unit body 110b may be configured such that the fiber having a large coiling radius is replaced with a fiber having a small coiling radius. The two fibers constituting the unit body 110b may be homochiral fibers or heterochiral fibers, respectively, and may be composed of fibers having different structures. The fibers constituting the unit body 110b may include a heat conductor when forming a twisted or coiled ring. The heating element may be included in the form of a heating wire or a global coating. The unit body 110b can connect different energy supply means to each fiber. Accordingly, the unit body 110b can independently implement the driving of the fibers located inside and the fibers moving outside.

< Example 3 > Including a single soft actuator (11) Focus variable type  Lens (1)

9 is a schematic view of a focus-variable lens 1 according to an embodiment of the present invention. 9 (a), the focus variable lens 1 may include a first driver 1101 and a lens unit 13. When the focus variable lens 1 includes only the first driver 1101, one end of the first driver 1101 may contact the lens portion 13. At this time, the first driver 1101 is disposed symmetrically with respect to the proximal portion of the lens portion 13, and may be contracted or expanded at the same time to control the surface curvature of the lens portion 13.

The lens outer film of the lens portion 13 when the first driver 1101 contracts can change the surface curvature in a direction to narrow the distanced distance of the proximal portion. On the other hand, when the first actuator 1101 is inflated, the lens outer film of the lens portion 13 can change the surface curvature in the direction of increasing the distance of the proximal portion. In each case, the liquid lens accommodated in the lens outer film can be changed in shape depending on the physical deformation of the lens outer film.

Referring to FIG. 9 (b), the focus variable lens 1 may include a second driver 1103 and a lens unit 13. When the focus variable lens 1 includes only the second driver 1103, the second driver 1103 may contact the rim of the lens portion 13. [ At this time, the second driver 1103 may contract or expand to adjust the surface curvature of the lens portion 13.

10 shows the principle of operation of the annular actuator according to the embodiment of the present invention. Referring to FIG. 10, when the second driver 1103 contracts, the lens outer film of the lens portion 13 can change the surface curvature in the direction of increasing the distance of the proximal portion. On the other hand, when the second actuator 1103 is inflated, the lens outer film of the lens portion 13 can change the surface curvature in a direction to narrow the distanced distance of the proximal portion. In each case, the liquid lens accommodated in the lens outer film can be changed in shape depending on the physical deformation of the lens outer film.

As described above, the first driver 1101 and the second driver 1103 can change the surface curvature of the lens portion 13 through independent contraction or expansion. However, complementary driving can be realized through the structural arrangement of the first driver 1101 and the second driver 1103, thereby paying attention to the effect of precisely and precisely controlling the surface curvature of the lens portion 13 do.

< Example 4 > Focus variable type  The multi-stage installation structure of the lens 1

Fig. 11 shows a focus variable lens 1 provided in a multi-stage according to the embodiment of the present invention.

11, the focus variable lens 1 includes a lens unit 13 including a convex lens or a concave lens and a soft actuator 11 having a multi-stage structure and connected to the frame 15 and the control unit 17 have. In particular, one end of the first driver 1101 and the frame 15 may be connected. The focus variable lens 1 having such a structure is preferably applied to a microscope, a telescope, or the like, which is an optical instrument having a cylindrical frame 15. Also. As well as the configuration of the additional lens unit 13 and the soft actuator 11 in addition to the two-stage lens. The frame 15 may have a conductor for transferring energy to the soft actuator 11. The control unit 17 can independently control the first driver 1101 connected to the frame 15 and the second driver 1103 connected to the first driver 1101 based on the lens unit 13. In other words, it is possible to independently control the convex lens located on the relatively left side and the soft actuator 11 connected to the concave lens located on the relatively right side.

< Example 5 > Lens Imitation Focus variable type  Lens (1)

12 shows a focus variable lens 1 simulating a lens according to an embodiment of the present invention. Fig. 13 shows a focus-variable lens 1 in the form of a spectacle according to an embodiment of the present invention.

12 to 13, the focus variable lens 1 can be connected to the ring-shaped frame 15, the control unit 17, and the sensor unit 19 with the lens unit 13 and the soft actuator 11 . In particular, one end of the first driver 1101 and the frame 15 may be connected. It is preferable that the focus variable lens 1 having such a structure is applied to a magnifying lens and glasses which are composed of a single lens and are easy to carry and have a simple structure. The frame 15 may have a conductor for transferring energy to the soft actuator 11. The sensor unit 19 can sense the focal distance of the lens. The sensor unit 19 can transmit information related to the detected focal length to the control unit 17. [ The control unit 17 may control the first driver 1101 connected to the frame 15 and the second driver 1103 connected to the first driver 1101 based on the information transmitted from the sensor unit 19. [

On the other hand, the first driver 1101 and the second driver 1103 can be complementarily driven. When the first driver 1101 actively shrinks, the second driver 1103 may exhibit a relatively passive drive. Especially. The second driver 1103 can be inflated manually and at the same time the lens outer film can be inflated to narrow the distance of the proximal portion of the lens.

Likewise, when the first driver 1101 is actively expanding, the second driver 1103 may exhibit a relatively passive drive. In particular, the second driver 1103 can be manually retracted, and at the same time, the lens outer film can be contracted to increase the spaced distance of the proximal portion of the lens.

On the other hand, when the second driver 1103 actively shrinks, the first driver 1101 can passively expand. At this time, the distanced distance of the proximal portion of the lens may increase.

Likewise, when the second driver 1103 is actively expanding, the first driver 1101 can manually retract. At this time, the distance of the proximal portion of the lens may be reduced.

In particular, in the case of the spectacle lens of the eyeglass focus type in which the lens portion 13 and the soft actuator 11 are arranged in parallel as shown in Fig. 13, the lens portion 13 may include a convex lens or a concave lens have. The control unit 17 can independently control the soft actuators 11 connected to the respective lenses shown in the left and right sides of the drawing.

In addition, the focus type variable focus lens 1 of the eyeglasses type can be modified and extended to connect the frame of the VR device to the soft actuator 11, thereby preventing inconvenience caused when the glasses and the VR device are worn together. As a result, it can be applied as a way to lower the barriers of access for low vision to the VR industry, which is in recent demand.

< Example 6 > Placement of thermoelectric element and soft actuator (11)

14 shows a thermoelectric device according to an embodiment of the present invention. 15 is a layout diagram of a soft actuator 11 and a thermoelectric device according to an embodiment of the present invention.

14 and 15, a thermoelectric device may include an n-type semiconductor, a p-type semiconductor, and a conductor disposed in series between an n-type semiconductor and a p-type semiconductor. The thermoelectric element may be an n-type semiconductor, a p-type semiconductor, and a conductor connected in series to convert the current transferred from the controller 17 into heat energy and transmit the heat energy to the soft actuator 11. Referring again to FIG. 14, the thermoelectric elements are arranged in such a manner that the conductors are connected to the n-type semiconductor and the p-type semiconductor at the top (A side) and the bottom (B side), and the thermoelectric elements are laid The 'd' shape may be provided in a continuous form. In addition, the thermoelectric elements can be provided in various forms other than the above-described forms. When the conductor located on the A side is heated, the conductor located on the B side can be cooled. When the conductor located on the A side is cooled, the conductor located on the B side is heated and the conductor located on the A side and the B side are different Cooled or heated. Further, the thermoelectric element can constitute a closed circuit with the control section 17. [

Conductors are substances with high electrical conductivity and thermal conductivity. In other words, it refers to materials that conduct electricity and heat well. The conductor may be a conductor or a conductor. A conductor is the corresponding term for an insulator.

In general, a semiconductor is an n-type semiconductor when many free electrons are present, and a p-type semiconductor when the hole density is larger than a free electron density. Ionized impurity atoms lose electrons and are called donors. Semiconductors whose impurities are mainly donors are n-type semiconductors. In contrast, a p-type semiconductor is current driven by an acceptor.

In this embodiment, the thermoelectric element is divided into a conduction path in which a current passes through a n-type semiconductor, a conductor in a p-type semiconductor, and a conduction path in which a current passes through a p- , The conductor can be heated or cooled. The thermoelectric element may be an n-type semiconductor or a p-type semiconductor connected to the control section 17. [ The thermoelectric element can heat or cool the conductor according to the direction of the current supplied to the n-type semiconductor and the direction of the current supplied to the p-type semiconductor. The thermoelectric element can be cooled when the current passing through the n-type semiconductor and flowing through the conductor to the p-type semiconductor is supplied. On the other hand, the conductor can be heated when a current flows in the direction of flowing to the n-type semiconductor through the conductor through the p-type semiconductor. The thus cooled or heated conductor can transmit heat energy to cool or heat the soft actuator 11.

Referring to FIG. 15, the thermoelectric element may be connected to one end of the soft actuator 11 to transmit current and heat energy. The soft actuator 11 connected to the thermoelectric element may be the first driver 1101. The unit 110a composed of the heterochiral fiber and the homochiral fiber may have one end of each fiber connected to the conductor of the thermoelectric element.

The thermoelectric elements receiving the current (current) through the control unit 17 flow first in the order of n-c-p, at which time the conductor can be cooled. The conductors can be connected to the homochiral fibers to expand the homochiral fibers. The heterochiral fibers may be arranged in parallel with the homochiral fibers in connection with the conductors of the thermoelectric elements having a sequence different from the homochiral fibers, i.e., p-c-n. In this case, as the current in the same direction as described above is applied, the conductor can be heated. At this time, the heterochiral fiber can be expanded like the homochiral fiber. In this way, the unit body 110a can be inflated. On the other hand, in the case where the arrangement of the thermoelectric element and the unit body 110a is maintained and the direction of the current is reversed, the unit body 110a can be contracted.

On the other hand, assuming a thermoelectric element arranged differently from FIG. 15, a thermoelectric element to which a current (current) is applied through the controller 17 flows in the order of the first pcn, at which time the conductor can be heated . Conductors can be connected to homochiral fibers to shrink the homochiral fibers. The heterochiral fibers may be arranged in parallel with the homochiral fibers in connection with conductors of thermoelectric elements having a sequence different from the homochiral fiber, i.e., n-c-p. In this case, the conductor can be cooled as the current in the same direction as described above is applied. At this time, the heterochiral fiber can be contracted like the homochiral fiber. Thus, the unit body 110a can be contracted. On the other hand, when the direction of the current is reversed while maintaining the arrangement of the thermoelectric element and the unit body 110a, the unit body 110a can be expanded.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. will be. Therefore, the scope of the present invention should not be limited to the above-described embodiments, but should be determined by all changes or modifications derived from the scope of the appended claims and equivalents of the claims.

1: focus variable lens
11: Soft actuator
110a, 110b:
1101: first driver
1103: Second driver
13:
15: frame
17:
19:

Claims (12)

A lens portion whose focal length is adjusted by a tensile force or a compressive force applied to the outer periphery; And
And a soft actuator for forming a twisted and coiled ring so that a fiber that shrinks or expands upon heating or cooling stretches or compresses the outer periphery of the lens section to change surface curvature of the lens section.
The method according to claim 1,
The soft actuator
Characterized in that it comprises a homochiral fiber which is shrunk by heating and expanded by cooling, and a unit composed of heterochiral fibers which are expanded by heating and contracted by cooling.
The method according to claim 1,
The soft actuator
Wherein one end of the fiber is connected in a direction perpendicular to an outer circumference of the lens portion and a plurality of first actuators are provided to apply a tensile force or a compressive force to the outer circumference of the lens portion in a vertical direction.
The method of claim 3,
Wherein the first driver comprises:
Wherein the lens unit is arranged in a point symmetrical manner around the outer periphery of the lens unit.
The method according to claim 1,
The soft actuator
And a second driver which is in contact with the lens portion so that the fiber surrounds the rim of the lens portion.
6. The method of claim 5,
The soft actuator
Further comprising a first driver in which one end of the fiber is connected to an outer periphery of the second driver and extends in a normal direction and a plurality of the fibers are arranged in a point-
Wherein the second driver comprises:
Wherein the first lens unit and the second lens unit apply tensile force or compressive force to the lens unit and the first driver when the lens unit is heated or cooled to shrink or expand.
The method of claim 3,
The soft actuator
And a second driver that contacts the lens unit to surround an edge of the lens unit,
Wherein the first driver comprises:
Wherein one end of the fiber is connected in a direction perpendicular to an outer circumference of the second driver and applies a tensile force or a compressive force in a direction perpendicular to the outer circumference of the second driver.
8. The method of claim 7,
Wherein the second driver comprises:
A second driver that is complementary to the first driver,
The lens unit includes:
Wherein a tensile force or a compressive force exerted by the plurality of first actuators is evenly distributed around the outer periphery.
The method of claim 3,
Further comprising a frame connected to the other ends of the fibers included in the first driver and spaced apart from the lens unit at intervals greater than the length of the first driver.
10. The method of claim 9,
The frame includes:
Wherein the soft actuator includes a conductive material, and the current or heat energy is transferred to the soft actuator.
The method according to claim 1,
Further comprising a sensor section for measuring a driving range of the soft actuator to set a focal distance of the lens section.
The method according to claim 1,
Further comprising a controller for controlling a current applied to the soft actuator to control the degree of shrinkage or expansion of the soft actuator.

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