WO2020242243A1 - Lens and lens assembly comprising same - Google Patents

Abstract

A lens according to an embodiment comprises: a first plate including a cavity; a room-temperature ionic liquid disposed in the cavity; a non-conductive liquid disposed in the cavity and coming in contact with the room-temperature ionic liquid; a first electrode disposed on the first plate and not coming in contact with the room-temperature ionic liquid; and a second electrode disposed on the first plate and coming in contact with the room-temperature ionic liquid.

Description

Lens and lens assembly containing the lens

Embodiments relate to a lens and a lens assembly comprising the lens.

Users of portable devices want optical devices that have high resolution, are small in size, and have various photographing functions. For example, various shooting functions include at least one of an optical zoom function (zoom-in/zoom-out), an auto-focusing (AF) function, or an image stabilization or image stabilization (OIS) function. Can mean

In the conventional case, in order to implement the aforementioned various photographing functions, a method of combining several lenses and directly moving the combined lenses was used. However, when the number of lenses is increased in this way, the size of the optical device may increase.

The autofocus and image stabilization functions are performed by moving or tilting several lenses aligned with the optical axis in a vertical direction of the optical axis or the optical axis. In this case, there is a problem in that optical performance is deteriorated due to thermal expansion of different liquids included in the lens unit that performs auto focusing and camera shake correction functions in the optical device.

The embodiment is to provide a lens having improved optical performance despite temperature change and a lens assembly including the lens.

The technical problem to be solved in the embodiment is not limited to the technical problem mentioned above, and another technical problem not mentioned will be clearly understood by those of ordinary skill in the technical field to which the present invention belongs from the following description. I will be able to.

A lens according to an embodiment includes: a first plate including a cavity; Room temperature ionic liquid disposed in the cavity; A non-conductive liquid disposed in the cavity and in contact with the room temperature ionic liquid; And a first electrode disposed on the first plate and not in contact with the room temperature ionic liquid. It may include a second electrode disposed on the first plate and in contact with the room temperature ionic liquid.

For example, the room temperature ionic liquid may contain one of the following formulas.

A lens according to another embodiment may include a first plate including a cavity; A gel electrolyte membrane disposed in the cavity; A non-conductive material in contact with the gel electrolyte membrane and disposed in the cavity; A first electrode disposed on the first plate and not in contact with the gel electrolyte membrane; And a second electrode disposed on the first plate and in contact with the gel electrolyte membrane.

For example, the non-conductive material may comprise a non-conductive liquid.

For example, the non-conductive material may include air.

For example, the gel electrolyte membrane may include room temperature ionic liquid or polymer.

For example, the room temperature ionic liquid may be an imidazolium-based ionic liquid. The room temperature ionic liquid may include an ionic liquid having at least one structure selected from the following formulas.

(1-Ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide; [EMIM][TFSI])

(1-Butyl-3-methylimidazolium hexafluorophosphate; [BMIM][PF ₆ ])

(1-ethyl-3-methylimidazolium n-octylsulfate; [EMIM][OctOSO ₃ ])

(1-Butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide; [BMIM][TFSI])

For example, the room temperature ionic liquid may be a pyrrolidinium-based ionic liquid.

For example, the polymer is PS-PEO-PS (polystyrene-block-poly(ethylene oxide)-block-polystyrene), Nafion, sulfonated polystyrene, and Poly(N-isopropylacrylamide) ( PNIPAM), or a combination thereof.

For example, the gel electrolyte membrane may include a water-based liquid electrolyte and a water-soluble polymer.

For example, the water-soluble polymer may be made of an ion conductive polymer.

For example, the ion conductive polymer may be made of a fluorine-based or non-fluorine-based polymer having a structure in which a sulfonic acid group, an amine group, or a hydrophilic cation exchange functional group of a phosphoric acid group is bonded, or a structure in which an amine-based hydrophilic anion exchange functional group is bonded.

A lens assembly according to another embodiment includes: a first lens; And at least one second lens aligned with the first lens on an optical axis, and the first lens may include the aforementioned lens.

In the lens and the lens assembly including the lens according to the embodiment, deformation of the second plate is minimized even when the temperature changes due to heat of the lens itself or the temperature of the surroundings, or even when the temperature is high, and thus optical performance may be improved.

In addition, since the lens according to the embodiment, and the lens assembly including the lens, uses a gel electrolyte membrane as a conductive material, the influence of the lens from gravity can be minimized, and a non-conductive liquid such as oil may not be used. The manufacturing method of the can be simplified and the manufacturing cost can be reduced.

In addition, the gel-type polymer film used as a conductive material in the lens and the lens assembly including the lens according to the embodiment has the advantage of being very flat because the transparency is very high, 95% or more, and the surface roughness is adjustable.

In addition, the lens according to the embodiment and a lens assembly including the lens may be used in a wide temperature range of -80°C to 200°C.

In addition, the lens and the lens assembly including the lens according to the embodiment have an advantage of having a very high electrical driving range.

In addition, the effects obtained in the present embodiment are not limited to the above-mentioned effects, and another effect not mentioned can be clearly understood by those of ordinary skill in the field to which the present invention belongs from the following description. There will be.

1 is a cross-sectional view of a lens according to an embodiment.

2 is a graph for explaining driving of a lens according to the first and second embodiments described above.

3A and 3B are diagrams for explaining driving of a lens according to the fourth exemplary embodiment described above.

4 is a plan view of the lens shown in FIG. 1.

5A and 5B are cross-sectional views illustrating a second plate according to an embodiment.

6A and 6B are cross-sectional views of a second plate according to another embodiment.

7 is a cross-sectional view illustrating a state before and after an extension part is stretched in a second plate according to an exemplary embodiment in a direction parallel to an optical axis.

8 is a cross-sectional view showing a state before and after an extension part is stretched in a second plate according to another embodiment in a direction parallel to an optical axis.

9 is a cross-sectional view showing a state before and after an extension part is extended in a second plate according to another embodiment in a direction parallel to an optical axis.

10A and 10B are bottom views of a lens according to an embodiment.

11 shows a bottom view of a lens according to a comparative example.

12A to 12C are perspective views illustrating a manufacturing process of forming an adhesive from the lens shown in FIG. 1.

13 is a block diagram of a camera module according to an embodiment.

14A is a cross-sectional view of a camera module according to a comparative example, and FIG. 14B is a cross-sectional view of a lens according to the embodiment.

15 is a schematic block diagram of an optical device according to an embodiment.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

However, the technical idea of the present invention is not limited to some embodiments to be described, but may be implemented in various different forms, and within the scope of the technical idea of the present invention, one or more of the constituent elements may be selectively selected between the embodiments. It can be combined with and substituted for use.

In addition, terms (including technical and scientific terms) used in the embodiments of the present invention are generally understood by those of ordinary skill in the art, unless explicitly defined and described. It can be interpreted as a meaning, and terms generally used, such as terms defined in a dictionary, may be interpreted in consideration of the meaning in the context of the related technology.

In addition, terms used in the embodiments of the present invention are for describing the embodiments and are not intended to limit the present invention. In the present specification, the singular form may include the plural form unless specifically stated in the phrase, and when described as “at least one (or more than one) of A and (and) B and C”, it is combined with A, B, and C. It may contain one or more of all possible combinations.

In addition, terms such as first, second, A, B, (a), and (b) may be used in describing the constituent elements of the embodiment of the present invention. These terms are only for distinguishing the component from other components, and are not limited to the nature, order, or order of the component by the term.

And, when a component is described as being'connected','coupled' or'connected' to another component, the component is not only directly connected, coupled or connected to the other component, but also the component and It may also include a case of being'connected','coupled' or'connected' due to another component between the other components.

In addition, when it is described as being formed or disposed on the “top (top) or bottom (bottom)” of each component, the top (top) or bottom (bottom) is one as well as when the two components are in direct contact with each other. It also includes a case in which the above other component is formed or disposed between the two components. In addition, when expressed as "upper (upper) or lower (lower)", the meaning of not only an upward direction but also a downward direction based on one component may be included.

Hereinafter, a lens according to an exemplary embodiment, a lens assembly including the lens, and a camera module including the assembly will be described using a Cartesian coordinate system, but the exemplary embodiment is not limited thereto. That is, according to the Cartesian coordinate system, the x-axis, y-axis, and z-axis are orthogonal to each other, but embodiments are not limited thereto. That is, the x-axis, y-axis, and z-axis may cross each other instead of orthogonal.

1 shows a cross-sectional view of a lens 100 according to an embodiment.

Referring to FIG. 1, a lens 100 according to an embodiment includes a conductive material 110, a non-conductive liquid (or air) 120, a plurality of plates, first and second electrodes E1 and E2, and It may include an insulating layer 146.

The conductive material 110 may be filled, accommodated, or disposed in at least a portion of the cavity CA.

According to an embodiment, the conductive material 110 may have various shapes.

Hereinafter, a conductive material 110 according to various embodiments will be described as follows.

According to the first embodiment, the conductive material 110 may be a room temperature ionic liquid (RTIL) as a conductive liquid. RTIL refers to an ionic liquid that exists as a liquid at room temperature. The RTIL may be a liquid composed of only ions, for example an anion smaller than a macrocation including nitrogen. RTIL maintained by the Coulomb force has very low volatility, so it is liquid at room temperature and has a low expansion rate. In addition, RTIL is non-volatile, non-toxic, non-flammable, has excellent thermal stability and ionic conductivity, and exists as a liquid over a wide temperature range. In particular, RTIL can optimize its properties by changing positive/anion ions according to the purpose of use. In addition, RTIL can be used as an electrolyte because of its wide electrochemical window, high ionic conductivity, wide liquid temperature range, non-volatile and non-explosive properties.

For example, RTIL may be selected from the following Formulas 1 to 5, or may include at least one.

Here, mmim is dimethylimidazolium, emim is ethylmethylimidazolium, bmim is butylmethylimidazolium, hmim is hexylmethylimidazolium, omim Is octylmethylimidazolium.

According to the second embodiment, the conductive material 110 may further include a cosolvent as well as RTIL. When a co-solvent is mixed with RTIL, the viscosity characteristics, temperature range of the liquid used, electrical characteristics, and ionic conductivity characteristics of the conductive material 110 may be improved. That is, by using the co-solvent, the viscosity of the conductive material 110 is lowered and the electrical properties are increased, the use temperature range is increased, and the electric drive range can be extended.

For example, the co-solvent may consist of dimethyl sulfoxide, but is not limited thereto.

According to the third and fourth embodiments, the conductive material 110 may include a gel electrolyte membrane.

According to the third embodiment, the gel electrolyte membrane may include room temperature ionic liquid and/or polymer. A room temperature ionic liquid can be prepared as a gel electrolyte membrane using various polymers capable of physically or chemically bonding with the room temperature ionic liquid.

The room temperature ionic liquid may be an ionic liquid based on imidazolium or a ionic liquid based on pyrrolidinium.

If the room temperature ionic liquid is an imidazolium-based ionic liquid, the room temperature ionic liquid may include an ionic liquid having at least one structure selected from Formulas 6 to 9 below.

(1-Ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide; [EMIM][TFSI])

(1-Butyl-3-methylimidazolium hexafluorophosphate; [BMIM][PF ₆ ])

(1-ethyl-3-methylimidazolium n-octylsulfate; [EMIM][OctOSO ₃ ])

(1-Butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide; [BMIM][TFSI])

In addition, in the third embodiment, the polymer included in the gel electrolyte membrane is PS-PEO-PS (polystyrene-block-poly(ethylene oxide)-block-polystyrene), Nafion, and sulfonated polystyrene. ), Poly(N-isopropylacrylamide) (PNIPAM), or a combination thereof.

According to the fourth embodiment, the gel electrolyte membrane may include a water-based liquid electrolyte and a water-soluble polymer. After preparing a water-based liquid electrolyte, a water-based liquid electrolyte can be prepared as a gel-type water-based electrolyte membrane using various water-soluble polymers capable of physically or chemically bonding with the water-based liquid electrolyte.

The water-soluble polymer may be made of an ion conductive polymer. The ion conductive polymer may be made of a fluorine-based or non-fluorine-based polymer having a structure in which a sulfonic acid group, an amine group, or a hydrophilic cation exchange functional group of a phosphoric acid group is bonded, or an amine-based hydrophilic anion exchange functional group is bonded, but embodiments are limited thereto. It doesn't work.

The fluorine-based polymer electrolyte is at least among the fluorine-based groups of polytetrafluoroethrylene (PTFE), polyvinylfluoride (PVF), polyvinylidine fluoride (PVDF), and polyethylenetetrafluoroethylene (ETFE). Any one of a fluorine-based polymer with a sulfonic acid group, an amine group, a hydrophilic cation exchange functional group group of a phosphoric acid group, and at least one of a structure having an amine-based hydrophilic anion exchange functional group may have a structure in which a hydrophilic ion exchange functional group is bonded. For example, the fluorine-based polymer electrolyte is Nafion, Aquivion, Flemion, Gore, Aciplex, R-1030, Aciplex A-192 or Morgane ADP. I can.

The non-fluorine-based polymer electrolyte is a non-fluorine-based polymer of any one of polyarylene, polyetherketone and polyetheretherketone, or a hydrophilic cation exchange functional group of sulfonic acid group, amine group, and phosphoric acid group and amine-based hydrophilic anion. At least one of the exchange functional group groups may have a structure in which a hydrophilic ion exchange functional group is bonded. For example, the non-fluorine-based polymer electrolyte is sulfonated polyetheretherketone (sPEEK), sulfonated polyetherketone (sPEK), sulfonated polyethersulfone (sPES). ), sulfonated polyarylethersulfone (sPAES) may be a cationic conductive polymer film or an anionic conductive polymer film.

Meanwhile, in each of the first to fourth embodiments, the lens 100 may further include a non-conductive material. Here, the non-conductive material may include a non-conductive liquid (hereinafter, referred to as “non-conductive liquid”) 120. The non-conductive liquid 120 may be disposed in contact with the conductive material 110 in the cavity CA. As shown, a conductive material 110 may be disposed on the non-conductive liquid 120.

That is, according to the first and second embodiments, the non-conductive liquid 120 is disposed in contact with the room temperature ionic liquid 110, and according to the third and fourth embodiments, the non-conductive material 120 is a gel electrolyte membrane ( 110) can be placed in contact,

The conductive material 110 and the non-conductive material 120 (eg, a non-conductive liquid) are not mixed with each other, and an interface BO may be formed in a contact portion between the conductive material 110 and the non-conductive liquid.

Alternatively, in each of the third and fourth embodiments, the non-conductive material disposed under the conductive material 110 may include air 120 instead of the non-conductive liquid. The conductive material 110 and the air 120 are not mixed with each other, and an interface BO may be formed in a contact portion between the conductive material 110 and the air 120. As described above, according to the third and fourth embodiments, only a gel electrolyte membrane may be used without using a non-conductive liquid such as oil.

If the conductive material 110 in FIG. 1 is a polar fluid, for example, water (H2O) containing salt, heat generated when the lens 100 is operated or the lens (100) The conductive material 110 and the non-conductive liquid (or air) 120 may expand in the optical axis direction (eg, z-axis direction) by the ambient temperature. The stress caused by the thermal expansion is concentrated to the second plate P2, causing a lot of bending in the second plate P2, thereby deteriorating optical performance.

However, as in the lens 100 according to the above-described embodiment, when the conductive material 110 includes a room temperature ionic material, a room temperature ionic material including a co-solvent, or a gel electrolyte membrane, thermal expansion according to temperature is polarity. Since it is smaller than the fluid having A, the stress applied to the second plate P2 is reduced, so that the optical performance does not deteriorate and can be maintained satisfactorily.

Meanwhile, the above-described cavity CA is located on the optical axis LX, and may be defined by at least one plate.

According to an embodiment, the plurality of plates may include first to third plates P1 to P3. The first plate P1 may include a cavity CA. For example, the first plate P1 may include an inner side surface i defining a side portion of the cavity CA. In this case, the inner surface i of the first plate P1 may be inclined as shown, but the embodiment is not limited thereto.

The cavity CA may include first and second openings O1 and O2 respectively formed above and below the first plate P1. That is, the cavity CA may be defined as a region surrounded by the inner surface i of the first plate P1, the first opening O1 and the second opening O2. The diameter of the wider one of the first and second openings O1 and O2 may vary depending on the FOV required by the lens 100 or the role to be performed in the optical device including the lens 100. According to an embodiment, the size (or area or width) of the first opening O1 may be larger than the size (or area or width) of the second opening O2. Here, the size of each of the first and second openings O1 and O2 may be a cross-sectional area in a horizontal direction (eg, in the x-axis and y-axis directions). For example, the size of each of the first and second openings O1 and O2 may mean a radius when the cross section of the opening is circular, and may mean a diagonal length when the cross section of the opening is square.

The cavity CA is a part through which light passes. Accordingly, the first plate P1 constituting the cavity CA may be made of a transparent material or may contain impurities so that light transmission is not easy.

The light may be incident in the cavity CA through a first opening O1 that is wider than the second opening O2 and emitted through the second opening O2, or a second opening that is narrower than the first opening O1 ( It may be incident through O2) and emitted through the first opening O1.

In addition, the second plate P2 may be disposed above or below the first plate P1, and the third plate P3 may be disposed above or below the first plate P1. For example, as shown, the second plate P2 may be disposed above the first plate P1, and the third plate P3 may be disposed below the first plate P1. In this case, the second plate P2 may be disposed above the cavity CA, and the third plate P3 may be disposed below the cavity CA.

The second plate P2 and the third plate P3 may be disposed to face each other with the first plate P1 interposed therebetween. Also, at least one of the second plate P2 and the third plate P3 may be omitted.

At least one of the second or third plates P2 and P3 may have a rectangular planar shape, and a partial region may be escaped to expose a part of an electrode to be described later. Each of the second and third plates P2 and P3 is a region through which light passes, and may be made of a light-transmitting material. For example, each of the second and third plates P2 and P3 may be made of glass, and may be made of the same material for convenience of the process. Further, the edges of each of the second and third plates P2 and P3 may have a rectangular shape, but are not limited thereto.

The second plate P2 may have a configuration that allows incident light to proceed into the cavity CA of the first plate P1, but may have a configuration that allows light to be emitted in the opposite direction. The third plate P3 may have a configuration that allows light that has passed through the cavity CA of the first plate P1 to be emitted, but may have a configuration that allows the light to be emitted in the opposite direction. The second plate P2 may directly contact the conductive material 110.

In addition, the actual effective lens area of the lens 100 may be narrower than the diameter of the narrow second opening O2 among the first and second openings O1 and O2 of the first plate P1.

Meanwhile, the first electrode (or individual electrode) E1 is disposed on one surface of the first plate P1 (for example, under the first plate P1), and the second electrode (or a common electrode) (E2) may be disposed on the other surface of the first plate P1 (eg, above the first plate P1). That is, the first electrode E1 is disposed on the first plate P1 and does not contact the room temperature ionic liquid, and the second electrode E2 is disposed on the first plate P1 and contacts the room temperature ionic liquid. can do.

A portion of the second electrode E2 disposed on the first plate P1 may be exposed to the conductive material 110 to directly contact the conductive material 110. On the other hand, the insulating layer 146 is disposed between the first electrode E1 and the conductive material 110, and the insulating layer 146 is disposed between the first electrode E1 and the non-conductive liquid (or air) 120. ) Is disposed, the first electrode E1, the conductive material 110, and the non-conductive liquid (or air) 120 may be electrically separated from each other.

Alternatively, although not shown, an oxide film (not shown) may be disposed between the second electrode E2 and the conductive material 110.

The first electrode E1 may be a plurality of electrodes, and the second electrode E2 may be one electrode. For example, the number of first electrodes E1 may be 4 or 8, and the embodiment is not limited to a specific number of first electrodes E1.

In addition, the first electrode E1 may be disposed extending from between the first and third plates P1 and P3 to the inner side i of the first plate P1.

In addition, the first electrode E1 may extend from the inner surface i of the first plate P1 to the top of the first plate P1 and may be disposed to be spaced apart from the second electrode E2.

Each of the first electrode E1 and the second electrode E2 may be made of a conductive material, for example, a metal.

Meanwhile, the insulating layer 146 may be disposed in the lower region of the cavity CA while covering a part of the upper surface of the third plate P3. That is, the insulating layer 146 may be disposed between the non-conductive liquid (or air) 120 and the third plate P3.

In addition, the insulating layer 146 may be disposed while covering the entire first electrode E1 disposed on the inner surface i of the cavity CA. Further, the insulating layer 146 may be disposed on the upper surface of the first plate P1 to cover a part of the second electrode E2 and the entire first electrode E1. In this way, the insulating layer 146 is a contact between the first electrode E1 and the conductive material 110, the contact between the first electrode E1 and the non-conductive liquid (or air) 120, and the third plate P3. ) And the non-conductive liquid (or air) 120 may block contact.

The insulating layer 146 may cover the first electrode E1 and expose a part of the second electrode E2 so that electrical energy is applied to the conductive material 110 through the second electrode E2.

Meanwhile, although not shown, the lens module including the lens 100 according to the embodiment may include a first connection substrate and a second connection substrate.

The first connection substrate may be electrically connected to an electrode pad formed on the main substrate (not shown) through a connection pad electrically connected to the first electrode E1. The second connection substrate may be electrically connected to an electrode pad formed on the main substrate through a connection pad electrically connected to the second electrode E2.

For example, the first connection substrate may be implemented as a flexible printed circuit board (FPCB), and the second connection substrate may be implemented as an FPCB or a single metal substrate (conductive metal plate), but embodiments are limited thereto. It doesn't work.

The first connection substrate may transmit a plurality of different voltages (hereinafter referred to as “individual voltages”) to the plurality of first electrodes E1, respectively. The second connection substrate may transmit one driving voltage (hereinafter, referred to as “common voltage”) to the second electrode E2. The common voltage may include a DC voltage or an AC voltage. When the common voltage is applied in the form of a pulse, the width or duty cycle of the pulse may be constant. That is, the driving voltage may be supplied to the lens 100 through the first connection substrate and the second connection substrate.

In response to the driving voltage, the curvature of the interface BO formed in the lens 100 may be changed to perform an auto-focusing (AF) function, and the tilting angle of the interface BO may be changed, thereby correcting hand shake or image It can also perform an OIS (Optical Image Stabilizer) function. If the lens 100 performs the AF function, individual voltages having the same level with each other may be transmitted to the plurality of first electrodes E1 through the first connection substrate. Alternatively, when the lens 100 performs the OIS function, a plurality of individual voltages having different levels may be respectively transmitted to the plurality of first electrodes E1 through the first connection substrate.

Hereinafter, the operation of the lens 100 according to the above-described embodiment will be described with reference to the accompanying drawings.

2 is a graph for explaining the driving of the lens 100 according to the first and second embodiments described above, wherein the horizontal axis represents the amount of electric charge and the vertical axis represents the amount of displacement.

Referring to FIG. 2, it can be seen that the displacement of the lens 100 varies as the level (eg, amount of charge) of the driving signal applied to the lens 100 is varied. With this principle, the lens 100 may be driven to perform an AF or OIS function.

3A and 3B are diagrams for explaining driving of the lens 100 according to the fourth embodiment. Here, for better understanding, the electrode to which the two voltages V1 and V2 are applied is shown to be in direct contact with the conductive material 110, but as described above, the electrodes V1 and V2 and the conductive material 110 An insulating layer 146 may be disposed therebetween.

When the driving voltage is not applied to the lens 100, positive and negative ions are arranged as shown in FIG. 3 (a). Thereafter, when a positive voltage (V1) and a negative voltage (V2) are applied to the lens 100, as shown in FIG. 3(b), the positive electrode moves to the electrode to which the negative voltage (V2) is applied, and , It can be seen that negative ions move to the electrode to which the positive voltage V1 is applied. With this principle, the AF function or the OIS function may be performed by applying a driving voltage to the lens 100.

In addition, the lens 100 according to the embodiment is not limited to the configuration shown in FIG. 1. That is, the conductive material according to the first to fourth embodiments is disposed instead of the conductive liquid among two different liquids, and air is disposed instead of the non-conductive liquid among two different liquids, or the non-conductive liquid itself is disposed. If possible, the lens according to the embodiment can be applied to lenses having any existing configuration.

Hereinafter, a lens according to an embodiment will be described in detail as follows.

4 is a plan view of the lens 100 shown in FIG. 1.

1 and 4, the second plate P2 may include first and second portions PA1 and PA2.

The first part PA1 is a part in contact with the conductive material 110, and the second part PA2 is a part surrounding the first part PA1. The second plate P2 may have a uniform first thickness T1.

In addition, the lens 100 illustrated in FIG. 1 may further include a bonding member 148. The bonding member (or adhesive) 148 is disposed between the first plate P1 and the second plate P2 and serves to couple the first plate P1 and the second plate P2 to each other.

Alternatively, the lens 100 illustrated in FIG. 1 may further include a plate leg (LEG) 148 instead of including the bonding member 148. The plate leg 148 is disposed between the first plate P1 and the second plate P2 and serves to support the second plate P2. Here, the plate leg 148 may be integrally implemented with the same material as the second plate P2. The member 148 may have a second thickness T2.

The thickness of the portion of the third plate P3 facing the non-conductive material (eg, non-conductive liquid or air) 120 (hereinafter referred to as'third thickness') (T3) is the first thickness (T1) And may be less than the total sum of the first thickness T1 and the second thickness T2. For example, the first thickness T1 and the third thickness T3 may be the same.

The conductive material 110 and the non-conductive material (for example, non-conductive liquid or air) 120 by heat generated when the lens 100 according to the above-described embodiment operates or the temperature around the lens 100 It can expand in the optical axis direction (eg, z-axis direction). At this time, if the third thickness T3 of the third plate P3 is thick and the first thickness T1 of the second plate P2 is relatively thin, the stress due to thermal expansion is greater than that of the third plate P3. The second plate (P2) is concentrated to cause a lot of curvature in the second plate (P2), the optical performance may be poor.

However, as described above, the first thickness T1 of the second plate P2 and the third thickness T3 of the third plate P3 are the same, or the third thickness T3 is the first thickness T1 ) And the second thickness (T2), but slightly larger than the first thickness (T1), the thermal expansion of the conductive material 110 and the non-conductive material (for example, non-conductive liquid or air) 120 The resulting stress may be distributed to the first and third plates P1 and P3. In this way, when the stress is dispersed, the probability that the second plate P2 is damaged is reduced, and the optical performance of the lens 100 is not deteriorated and can be maintained satisfactorily.

Meanwhile, the first portion PA1 of the second plate P2 may have a flat portion FP and an elastic portion EP.

The flat portion FP may have a first thickness T1 uniformly and may be positioned on a path through the optical axis LX in the second plate P2.

As illustrated in FIG. 4, the stretchable part EP is a part surrounding the flat part FP and may be disposed between the flat part FP and the second part PA2.

The elastic part EP may have greater elasticity than the flat part FP. When the elastic part EP has a greater elasticity than the flat part FP, the stress is flat when the conductive material 110 and the non-conductive material (eg, non-conductive liquid or air) 120 are thermally expanded. It may be concentrated in the elastic portion EP rather than the portion FP. To this end, the flat portion FP may be connected to the elastic portion EP so that parallel movement may be possible to move away from or close to the cavity CA according to the expansion and contraction of the elastic portion EP.

If the first part PA1 of the second plate P2 is curved by the thermal expansion of the conductive material 110 and the non-conductive material (eg, non-conductive liquid or air) 120 (see FIG. 14A to be described later) 230), the performance of the lens 100 may be deteriorated. However, as in the embodiment, when the flat portion FP moves in parallel, the conductive material 110 and the non-conductive material (eg, non-conductive liquid or air) 120 are not affected or affected by thermal expansion. Less received, the performance of the lens 100 can be maintained.

If the width W of the first part PA1 (or the flat part FP) is smaller than the width of the second opening O2, one of the both ends of the flat part FP is deflected, etc. When the (110) and the non-conductive material (eg, non-conductive liquid or air) 120 are expanded, the parallel movement of the flat portion FP may become difficult. Accordingly, the width W of the first portion PA1 (or the flat portion FP) may be larger than the width of the second opening O2, but the embodiment is not limited thereto.

As shown in FIG. 4, the expansion and contraction part EP may have an annular planar shape, but the embodiment is not limited to a specific planar shape of the expansion and contraction part EP.

5A and 5B are cross-sectional views illustrating a second plate P2 according to an embodiment. While FIG. 5A shows the entire cross-section of the second plate P2, for convenience of explanation, FIG. 5B shows only the left portion of the cross-sectional shape of the second plate P2. The right portion of the second plate P2, which is not shown in FIG. 5B, is symmetrical with the left portion shown in FIG. 5B in the y-axis direction, and thus can be seen through FIG. 5B.

According to an embodiment, the number of flat portions FP may be plural. For example, as shown in FIGS. 5A and 5B, the flat portion FP may include first and second flat portions FP1 and FP2. The first flat portion FP1 corresponds to the flat portion FP shown in FIG. 4, and the second flat portion FP2 is between the elastic portion EP and the second portion PA2 of the second plate P2. Can be placed on

According to another embodiment, the number of flat portions FP is one, as illustrated in FIG. 4, and the expansion and contraction portions EP may directly contact the second portion PA2. In addition, when the second flat portion FP2 shown in FIGS. 5A and 5B corresponds to the second part PA2 of the second plate P2, the second plate P2 shown in FIGS. 5A and 5B It also has one flat portion FP1.

Hereinafter, for convenience of description, the second flat portion FP2 illustrated in FIGS. 5A and 5B will be described as corresponding to the second portion PA2 of the second plate P2. That is, the flat portion referred to below is meant to mean the flat portion FP shown in FIG. 4 or the first flat portion FP1 shown in FIGS. 5A and 5B, respectively.

In addition, according to an embodiment, the stretchable part EP may include first to third segments S1 to S3. The first segment S1 may have a fourth thickness T4 smaller than the first thickness T1. The second segment S2 may be disposed between the first segment S1 and the flat portions FP and FP1. The third segment S3 may be disposed between the first segment S1 and the second part PA2.

According to an embodiment, at least one of the second and third segments S2 and S3 may have a cross-sectional shape whose thickness decreases as the first segment S1 approaches. For example, as shown in FIGS. 5A and 5B, each of the second and third segments S2 and S3 has a cross-sectional shape whose thickness decreases as the first segment S1 approaches.

As described above, when the elastic part EP includes the first segment S1 having a fourth thickness T4 smaller than the first thickness T1, the conductive material 110 and a non-conductive material (for example, , The stress caused by the thermal expansion of the non-conductive liquid or air) 120 is applied to the expansion/contraction part (EP) instead of the flat parts (FP, FP1), so that the influence of the flat parts (FP, FP1) by the stress is reduced. I can. In addition, when the thickness of at least one of the second and third segments S2 and S3 has a cross-sectional shape that decreases as the first segment S1 approaches, the conductive material 110 and the non-conductive liquid (or air) When the 120 expands or contracts, the elastic part EP may be flexibly expanded and contracted.

As illustrated in FIG. 5A, the stretchable part EP may include only one first segment S1. However, according to another embodiment, the elastic part EP may include a plurality of first segments. For example, as shown in FIG. 5B, the stretchable part EP may include the 1-1 and 1-2 segments S11 and S12.

If the number of first segments included in the elastic part EP is plural, the elastic part EP may further include a fourth segment S4 disposed between the plurality of first segments. For example, as shown in FIG. 5B, when the elastic part EP includes the 1-1 and 1-2 segments S11 and S12, the elastic part EP is the 1-1 segment S11. ) And a fourth segment (S4) disposed between the first-second segment (S12) may be further included. Referring to FIG. 5B, the fourth segment S4 may include 4-1 to 4-3 segments S41 to S43. The 4-1th segment S41 is in contact with the 1-1th segment S11 and is a portion located between the 1-1th segment S11 and the 4-2th segment S42. The 4-3th segment S43 is in contact with the 1-2nd segment S12 and is a portion located between the 1-2nd segment S12 and the 4-2th segment S42. The 4-2th segment S42 is a portion located between the 4-1th segment S41 and the 4-3th segment S43.

In addition, the fourth segment S4 may have a cross-sectional shape whose thickness decreases as it approaches the first segment S1. For example, referring to FIG. 5B, the 4-1 segment S41 has a cross-sectional shape whose thickness decreases as it approaches the 1-1 segment S11, and the 4-3 segment S43 is the first -2 It may have a cross-sectional shape whose thickness decreases as the segment approaches S12.

As described above, when the number of the first segments S1 is plural and the fourth segment S4 is disposed between the plurality of first segments S1, the conductive material 110 and a non-conductive material (for example, For example, more stress due to thermal expansion of the non-conductive liquid or air 120 may be applied to the expansion/contractor EP instead of the flat portions FP and FP1. In addition, when the fourth segment S4 has a cross-sectional shape in which the thickness decreases as the fourth segment S4 approaches the first segment S1, the expansion and contraction portion EP may be more flexible.

In addition, the expansion/contraction part EP may include at least one of a recess and a protrusion. Referring to FIG. 5A, the first to third segments S1 to S3 may form recesses. Further, referring to FIG. 5B, the fourth segment S4 may form a protrusion, and the top surface of the 4-2th segment S42 may correspond to the upper surface of the protrusion.

6A and 6B are cross-sectional views of the first portion PA1 of the second plate P2 according to another exemplary embodiment.

For example, as illustrated in FIGS. 6A and 6B, the expansion/contraction part EP may include a plurality of recesses R1 and R2 and at least one protrusion PT1 and PT2.

In addition, according to an embodiment, each of the recess and the protrusion may have at least one cross-sectional shape of a semicircular shape, a semi-elliptic shape, or a polygonal shape (eg, triangular, square, etc.). For example, as shown in FIG. 6A, the recess R1 may have a rectangular cross-sectional shape, and as shown in FIG. 6B, the recess R2 may have a semicircular cross-sectional shape.

In addition, according to an embodiment, the stretching part EP may have a zigzag shape.

7 to 9 are cross-sectional views illustrating before and after the extension part EP is stretched in the second plate P2 according to the embodiment in a direction parallel to the optical axis.

7(a), 8(a), and 9(a) show that before the conductive material 110 and the non-conductive liquid (or air) 120 thermally expand, that is, the elastic part EP is stretched. Figure 7 (b), Figure 8 (b) and Figure 9 (b) shows the previous cross-section, the conductive material 110 and the non-conductive liquid (or air) 120 thermally expands the elastic part (EP) It shows the cross section after stretching.

As described above, when the expansion and contraction portions EP are implemented at both ends of the first part PA1 of the second plate P2 in various forms, the conductive material 110 and a non-conductive material (for example, a non-conductive liquid or When the air) 120 is thermally expanded, more stress may be concentrated in the expansion/contraction part EP than in the flat parts FP and FP1. That is, as shown in FIGS. 7 (b), 8 (b), and 9 (b), the expansion and contraction portions EP are stretched like a spring, so that the flat portions FP and FP1 are parallel in the optical axis direction. Since it can be moved, the optical performance of the lens 100 can be maintained well without deteriorating.

Meanwhile, the first plate P1 and the second plate P2 may be coupled to each other in various ways.

The second part PA2 of the second plate P2 may include a bonding area BA. In the bonding area BA, the second plate P2 may be coupled to the first plate P1 through a bonding method. Here, the bonding method is a laser irradiation toward the bonding area BA by the second part PA2 of the second plate P2 having light transmission properties, thereby combining the first plate P1 and the second plate P2. It means the way to do it.

10A and 10B are bottom views of the lens 100 according to the embodiment. For convenience of explanation, FIGS. 10A and 10B show only the second plate P2.

10A and 10B, the second plate P2 includes a bonding area BA. Each bonding area BA has an inner periphery IE and an outer periphery OE. At least one of the inner edge IE and the outer edge OE of the bonding area BO may have a polygonal bottom shape. For example, the outer periphery of the bonding area BA may have a pentagonal bottom shape as shown in FIG. 10A or a hexagonal bottom shape as shown in FIG. 10B.

11 shows a bottom view of a lens according to a comparative example.

The second plate P2 of the lens according to the comparative example shown in FIG. 11 performs the same role as the second plate P2 of the lens 100 according to the embodiment. It is assumed that the lens according to the comparative example shown in FIG. 11 is the same as the lens 100 according to the embodiment, except that the shape of the bottom surface of the outer edge OE of the second plate P2 shown in FIG. 11 is different.

As shown in FIG. 11, when the outer edge of the bonding area BA has a circular bottom shape, it is caused by thermal expansion of the conductive material 110 and the non-conductive material (eg, non-conductive liquid or air) 120 The resulting stress is applied the most to the origin, that is, the center of the second plate P2, that is, the optical axis LX, having the same distance as the rim portion OE of the circle, and thus the second plate P2 may be damaged.

However, as shown in FIGS. 10A and 10B, when the outer edge of the bonding area BA of the second plate P2 is not circular but has a polygonal planar shape, the conductive material 110 and the non-conductive liquid (or , The stress caused by the thermal expansion of the air) 120 is distributed to each edge of the outer bonding area (BA) OE having a different distance from the center of the second plate (P2), that is, not only the optical axis (LX). The second plate P2 may receive less stress than when (OE) is circular. In addition, when the outside OE is polygonal as shown in FIGS. 10A and 10B than when the outside OE is circular as shown in FIG. 11, the area of the bonding area BA increases, thereby increasing the temperature. Accordingly, when the volume of the conductive material 110 and the non-conductive liquid (or air) 120 is expanded, it is possible to further prevent or minimize the second plate P2 from being bent or damaged.

1, the first and second plates P1 and P2 may be bonded to each other by an adhesive 148. For example, the adhesive 148 may be disposed in the bonding area BA shown in FIGS. 10A, 10B and 11.

Alternatively, when the member 148 and the second plate P2 are integrally formed in the lens 100 shown in FIG. 1, the first and second plates P1 and P2 are connected to each other by bonding in the bonding area BA. Can also be combined.

12A to 12C are perspective views illustrating a manufacturing process of forming an adhesive 148 in the lens 100 shown in FIG. 1.

Referring to FIG. 12A, a non-conductive material (eg, non-conductive liquid or air) 120 and a conductive material 110 are sequentially filled in the cavity CA in the first plate P1, and the adhesive 148 is prepared. The material 148A is disposed around the cavity CA.

Thereafter, referring to FIG. 12B, the conductive material 110 is filled in the cavity CA and the second plate P2 is covered on the first plate P1 on which the adhesive 148 manufacturing material 148A is formed.

Thereafter, referring to FIG. 12C, by applying heat or UV 160 on the resultant product shown in FIG. 12B to cure the material 148A for manufacturing the adhesive 148, the first and second plates ( P1, P2) can be combined with each other.

The adhesive 148 is not limited to the manufacturing method shown in FIGS. 12A to 12C, and may be manufactured by other methods.

In addition, the adhesive 148 may be manufactured in various forms and may be manufactured using, for example, Side Sealing Molding (SSM).

When the first and second plates P1 and P2 are bonded together, the first and second plates are thermally expanded when the conductive material 110 and the non-conductive material (eg, non-conductive liquid or air) 120 are thermally expanded. 2 Since the bonding portion of the plates P1 and P2 does not expand, a lot of stress is applied to the second plate P2 and may be destroyed.

However, as shown in FIG. 1, when the first and second plates P1 and P2 are bonded by the adhesive 148, the conductive material 110 and the non-conductive material (for example, a non-conductive liquid or air When) 120 is thermally expanded, the volume of the adhesive 148 expands in the direction A1 indicated by the arrow, so that the stress applied to the second plate P2 can be reduced as much as possible. Accordingly, when the conductive material 110 and the non-conductive material (eg, non-conductive liquid or air) 120 are thermally expanded, the second plate P2 may move in parallel, thereby preventing or minimizing deterioration in optical performance. I can make it. To this end, according to the embodiment, the coefficient of thermal expansion of the adhesive 148 may be greater than that of the second plate P2.

The lens 100 according to the above-described embodiment can be applied to various fields.

Hereinafter, a configuration and operation of a lens assembly and a camera module according to an embodiment including the above-described lens will be described as follows with reference to the accompanying drawings.

13 is a block diagram of a camera module 200 according to an embodiment.

The camera module 200 according to the embodiment may include a lens assembly 210 and an image sensor 220.

The lens assembly 210 according to the embodiment may include at least one first lens and a second lens 214. Here, the second lens 214 may mean the lens 100 illustrated in FIG. 1.

At least one first lens may be aligned with the second lens 214 along the optical axis LX. For example, as illustrated in FIG. 13, at least one first lens may include a first lens unit 212 and a second lens unit 216. Each of the first and second lens units 212 and 216 may include at least one lens. At least one of the first or second lens units 212 and 216 may be omitted.

Each of the plurality of first lenses may be a solid lens or a liquid lens, and the lens assembly 210 according to the embodiment is not limited to a specific shape of the lens.

In the case of FIG. 13, it is illustrated that the second lens 214 is disposed between the first lens unit 212 and the second lens unit 216, but the embodiment is not limited thereto. That is, according to another embodiment, the second lens 214 may be disposed above the first lens unit 212 or may be disposed below the second lens unit 216. As such, the second lens 214 may be disposed between the plurality of first lenses, above the plurality of first lenses, and below the plurality of first lenses.

In addition, the second lens 214 may also serve as any one of the plurality of first lenses.

In addition, the image sensor 220 transmits light passing through the opening of the second lens 214 (for example, the first and second openings O1 and O2 shown in FIG. 1) and at least one first lens. It can receive and generate image data. To this end, the image sensor 220 may be aligned with the second lens 214 and at least one first lens (eg, 212 and 216 shown in FIG. 13) along the optical axis LX.

In addition, as shown in FIG. 13, since the second lens 214 can serve as any one of the plurality of first lenses, the number of lenses included in the lens assembly 210 is reduced. I can. Accordingly, the size of the lens assembly 210 may be reduced.

Hereinafter, a lens and a camera module including a lens according to comparative examples and embodiments will be described with reference to the accompanying drawings.

14A is a cross-sectional view of a camera module according to a comparative example, and FIG. 14B is a cross-sectional view of a lens according to the embodiment.

The camera module according to the comparative example shown in FIG. 14A includes a first lens unit 212, a liquid lens 10, a second lens unit 216, and an image sensor 220, and the embodiment shown in FIG. 14B The camera module by includes a first lens unit 212, a second lens unit 214, a second lens unit 216, and an image sensor 220.

The first lens unit 212, the second lens unit 216, and the image sensor 220 shown in FIG. 14A are the first lens unit 212, the second lens unit 216, and the image sensor shown in FIG. 220), the same reference numerals are used, and duplicate descriptions are omitted. The liquid lens 10 of the camera module according to the comparative example shown in FIG. 14A has the same configuration as the lens 100 according to the embodiment shown in FIG. 1, but each of the first to third plates P1 to P3 The characteristics are different, and instead of the conductive material 110, a water-based conductive liquid (hereinafter, referred to as'LQ1') is included, and as the non-conductive material 120, a non-conductive liquid such as oil (hereinafter, referred to as'LQ2') ) Is placed.

The second lens 214 shown in FIG. 14B may be any one of the lenses 100 214 shown in FIG. 1 or 13.

In addition, the image sensor 220 shown in each of FIGS. 14A and 14B may correspond to an imaging surface of the image sensor 220 shown in FIG. 13.

The camera module according to the comparative example includes the liquid lens 10 in which the structure of the interface between the two liquids LQ1 and LQ2 is changed through voltage, and thus its use in various environments is restricted. The first liquid LQ1 is a water-based electrolyte, and is implemented by adding ions such as salt to water in a certain amount or more. Water-based electrolytes have a freezing point or melting point at 0°C and a boiling point at 100°C. Due to the fundamental material properties of water that decomposes when a voltage of 1.23V is applied, use in various environments is limited. Therefore, the liquid lens 10 using the water-based electrolyte as the conductive liquid LQ1 cannot be used at a high temperature of 100°C or higher and a low temperature of 0°C or lower.

In addition, at a temperature higher than room temperature, the conductive liquid LQ1 easily expands due to the rapid expansion coefficient of water, so that the second plate P2 is curved according to the temperature, thereby deteriorating optical performance. For example, when the temperature of the liquid lens 10 is 30 ℃ to 80 ℃, due to the expansion of the first and second liquids (LQ1, LQ2) different from each other, the second plate (P2) is deformed due to stress or even It may be destroyed. In order to solve this, the stress applied to the second plate P2 may be minimized by reducing the thickness of the second plate P2. However, when an etching process is added to reduce the thickness of the second plate P2, manufacturing cost and manufacturing time may increase, and the structure of the liquid lens 10 may be complicated.

In addition, as the temperature of the liquid lens 10 increases, the conductive liquid LQ1 and the non-conductive liquid LQ2 expand, so that the curvature of the second plate P2 gradually decreases, which is curved as the liquid lens 10. ), which can lead to deterioration in optical performance, such as a decrease in resolution.

In addition, in the case of the liquid lens 10 according to the comparative example, when the temperature is raised due to the volatility of water and the low boiling point, the stress due to the expansion of the liquid is concentrated only on the second plate P2 having a thin thickness, and optical performance is reduced. It can get very bad.

On the other hand, in the case of the lenses 100 and 214 according to the embodiment, a room temperature ionic liquid having a lower expansion rate according to temperature than a water-based electrolyte solution, a room temperature ionic liquid including a co-solvent, and room temperature ions Since a gel-type electrolyte membrane containing a liquid and a polymer or a gel-type electrolyte membrane containing a water-based liquid electrolyte and a water-soluble polymer is used, even when the temperature changes due to the heat of the lenses (100, 214) or the surrounding temperature, etc. Deformation of the second plate P2 is minimized, and thus optical performance may be improved.

In addition, unlike the comparative example using a liquid electrolyte, as in the third and fourth embodiments, when a gel-type electrolyte membrane is used as the conductive material 110, the influence of the lens 100 from gravity can be minimized. In addition, in the case of the third and fourth embodiments, since a non-conductive liquid such as oil may not be used, the manufacturing method of the lenses 100 and 214 may be simplified and the manufacturing cost may be reduced.

In addition, the gel-type polymer film used as the conductive material 110 in the third and fourth embodiments has an advantage of being very flat because the transparency is very high, 95% or more, and the surface roughness is adjustable.

In addition, in the case of the liquid lens 10 according to the comparative example, the temperature range that can be used is 0°C to 100°C, which is the temperature range of water, whereas the lenses 100 and 214 according to the embodiment have a temperature range of -80°C to 200°C. It can be used in a wide temperature range.

In addition, in the case of the water-based liquid lens 10 according to the comparative example, it can be electrically decomposed at a very low voltage of 1.23V, so that the electrical drive range is very low, whereas the lenses 100 and 214 according to the embodiment The electrical drive range has a very high advantage.

In addition, in order to minimize the effect of the thermal expansion of the conductive material 110 and the non-conductive material (for example, non-conductive liquid or air) on the second plate P2, the third thickness of the third plate P3 ( T3) is implemented to be similar to or equal to the first thickness T1 of the second plate P2, or implemented so that the second plate P2 has an elastic portion EP, or the outer edge of the bonding area BA or One of the cabinets may be implemented to have a polygonal planar shape, or the first and second plates P1 and P2 may be bonded by an adhesive 148 instead of bonding. Accordingly, as shown in FIG. 14B, deformation of the second plate P2 of the lens 214 at various temperatures or high temperatures may be minimized, and thus optical performance may be improved.

Meanwhile, an optical device may be implemented using the camera module 200 including a lens according to the above-described embodiment. Here, the optical device may include a device capable of processing or analyzing an optical signal. Examples of optical devices may include a camera/video device, a telescope device, a microscope device, an interferometer device, a photometer device, a polarimeter device, a spectrometer device, a reflectometer device, an autocollimator device, a lens meter device, and the like, including a lens assembly. This embodiment can be applied to an optical device capable of.

In addition, the optical device may be implemented as a portable device such as a smart phone, a notebook computer, or a tablet computer. These optical devices include a camera module 200, a display unit (not shown) that outputs an image, a battery (not shown) that supplies power to the camera module 200, a camera module 200, a display unit, and a battery. It may include a body housing. The optical device may further include a communication module capable of communicating with other devices and a memory unit capable of storing data. The communication module and the memory unit may also be mounted on the main body housing.

Hereinafter, an optical device 300 including a lens according to an embodiment will be described with reference to the accompanying drawings, but the optical device 300 according to the embodiment is not limited thereto.

15 is a schematic block diagram of an optical device 300 according to an embodiment.

The optical device 300 may include a prism unit 310, a lens 320, and a zooming unit 330. Here, the lens 320 may correspond to the lenses 100 and 214 described above.

The prism unit 310 serves to change the path of light incident in the direction indicated by IN to the optical axis LX of the lens 320.

The lens 320 may perform OIS and AF functions for light whose optical path is changed in the prism unit 310 and output to the zooming unit 330.

The zooming unit 330 zooms in/out of the light that has passed through the lens 320. To this end, the zooming unit 330 may include an actuator (not shown) that moves the plurality of lenses 320 in a direction parallel to the optical axis LX (eg, a z-axis direction).

The various embodiments described above may be combined with each other as long as they are not contradictory to each other without departing from the object of the invention. In addition, when a component of one embodiment is not described in detail among the various embodiments described above, the description of the component having the same reference numerals of the other embodiment may apply mutatis mutandis.

The embodiments have been described above, but these are only examples and do not limit the present invention, and those of ordinary skill in the field to which the present invention belongs are not illustrated above within the scope not departing from the essential characteristics of the present embodiment. It will be seen that various modifications and applications are possible. For example, each component specifically shown in the embodiment can be modified and implemented. And differences related to these modifications and applications should be construed as being included in the scope of the present invention defined in the appended claims.

The mode for carrying out the invention has been sufficiently described in the above-described "Best mode for carrying out the invention."

The lens according to the embodiment and the lens assembly including the lens include a camera/video device, a telescope device, a microscope device, an interferometer device, a photometer device, a polarimeter device, a spectrometer device, a reflectometer device, an autocollimator device, a lens meter device, and a smart device. It can be used in portable devices such as phones, notebook computers, and tablet computers.

Claims (10)

1. A first plate including a cavity;

   Room temperature ionic liquid disposed in the cavity;

   A non-conductive liquid disposed in the cavity and in contact with the room temperature ionic liquid;

   A first electrode disposed on the first plate and not in contact with the room temperature ionic liquid; And

   A lens including a second electrode disposed on the first plate and in contact with the room temperature ionic liquid.
2. The lens of claim 1, wherein the room temperature ionic liquid contains at least one of the following formulas.

   
3. A first plate including a cavity;

   A gel electrolyte membrane disposed in the cavity;

   A non-conductive material in contact with the gel electrolyte membrane and disposed in the cavity;

   A first electrode disposed on the first plate and not in contact with the gel electrolyte membrane; And

   A lens disposed on the first plate and including a second electrode in contact with the gel electrolyte membrane.
4. The method of claim 3,

   The non-conductive material is a lens comprising a non-conductive liquid.
5. The method of claim 3,

   The non-conductive material is a lens containing air.
6. The method of claim 3,

   The gel electrolyte membrane is a lens containing an ionic liquid or a polymer at room temperature.
7. The lens of claim 6, wherein the room temperature ionic liquid is an imidazolium based ionic liquid.
8. The lens of claim 7, wherein the room temperature ionic liquid includes an ionic liquid having at least one structure selected from the following formulas.

   

   (1-Ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide; [EMIM][TFSI])

   

   (1-Butyl-3-methylimidazolium hexafluorophosphate; [BMIM][PF ₆ ])

   

   (1-ethyl-3-methylimidazolium n-octylsulfate; [EMIM][OctOSO ₃ ])

   

   (1-Butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide; [BMIM][TFSI])
9. The method of claim 3, wherein the gel electrolyte membrane

   Lens containing water-based liquid electrolyte and water-soluble polymer.
10. A first lens; And

    Including at least one second lens aligned with the first lens and the optical axis,

    The lens assembly including the lens according to claim 1 or 3, wherein the first lens.

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