KR20160110111A - Active reflective lens and apparatus using the same - Google Patents

Abstract

BACKGROUND OF THE INVENTION Field of the Invention [0001] The present invention relates to a reflection type lens capable of changing a focal distance and an optical system using the same. According to an aspect of the present invention, there is provided an active reflective lens comprising: a lens unit including a deformable material according to an electrical signal; A support for supporting the lens unit; A base portion formed at a lower portion of the support portion; A first electrode formed on the lens unit; And a second electrode formed on the base portion, wherein a distance between the first electrode and the second electrode is determined according to the shape of the upper surface of the base portion, and the distance between the first electrode and the second electrode The distance between the electrodes may be different.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an active reflective lens,

BACKGROUND OF THE INVENTION Field of the Invention [0001] The present invention relates to a reflection type lens capable of changing a focal distance and an optical system using the same. More particularly, the present invention relates to a method of implementing a lens for eliminating aberrations, a reflective lens using the method, and a device using the same.

[0002] As digital technologies such as cameras, portable terminals, TVs, projectors, and medical devices are developed, a slimmer, lighter, and smaller size of a high-resolution display is required. In addition, miniaturization of an optical lens system for realizing a high-quality image has been demanded, and research for this has been progressing actively. Particularly, as a high-quality image sensor is mounted on a camera module of a portable terminal, functions such as variable focus, optical zoom and the like are becoming more important. Therefore, the conventional camera module realizes a variable focus and optical zoom function by changing the position of the lens using an actuator.

The conventional automatic zoom function adjusts the focal length automatically by adjusting the positions of a plurality of actuators. Here, the actuator may be a voice coil motor (VCM), a piezo actuator, or a stepping motor. The VCM moves the lens by using the current flowing in the coil and the electromagnetic force by the magnet. However, there is a limit to the generation of electromagnetic waves and the precision. The piezo actuator moves the lens by the friction between the stator and the rotor, which has a short life due to wear and a high price. A stepper motor rotates a lead screw to linearly move the lens, which has a disadvantage in that the operation mechanism is complicated and noise is generated due to friction of the gear part.

Conventional reflective focus variable lenses also inject gas or fluid into the chamber and adjust the focal distance using the resulting pressure variation in the chamber. However, since a pressure regulating device or the like is further required, it is difficult to miniaturize and array the device. In addition, the manufacturing process and structure are complicated and the production cost is high.

That is, since the conventional technique is complicated in structure and high in manufacturing cost, there is a limitation in making the optical device slim and light.

An object of the present invention is to provide an active reflective lens which is simple in structure and can be downsized. In addition, the present invention proposes an active reflective lens which is easy to adjust focal length and correct aberration.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not restrictive of the invention, unless further departing from the spirit and scope of the invention as defined by the appended claims. It will be possible.

According to an aspect of the present invention, there is provided an active reflective lens comprising: a lens unit including a deformable material according to an electrical signal; A support for supporting the lens unit; A base portion formed at a lower portion of the support portion; A first electrode formed on the lens unit; And a second electrode formed on the base portion, wherein a distance between the first electrode and the second electrode is determined according to the shape of the upper surface of the base portion, and the distance between the first electrode and the second electrode The distance between the electrodes may be different.

According to an embodiment of the present invention, there is provided an optical device including an active reflective lens, the active reflective lens including: a lens unit including a material deformable according to an electrical signal; A support for supporting the lens unit; A base portion formed at a lower portion of the support portion; A first electrode formed on the lens unit; And a second electrode formed on the base portion, wherein a distance between the first electrode and the second electrode is determined according to the shape of the upper surface of the base portion, and the distance between the first electrode and the second electrode The distance between the electrodes may be different.

According to an embodiment of the present invention, the lens portion is formed of the functional polymer whose shape changes according to the intensity and the pattern of the electric field, so that the focal length can be adjusted by deforming the lens portion according to the electrostatic force between the electrodes around the lens portion. Further, the curvature of the lens portion can be finely corrected using the initial shape of the base portion or the shape change of the base portion. Therefore, it is possible to provide an electrically actively reflective active reflective lens and an optical device including the same, without using physical force or pressure.

According to one embodiment of the present invention, there can be provided an active reflective lens which is simple in structure, can be miniaturized, can be arrayed, and an optical device including the active reflective lens. Further, it is possible to provide an active reflective lens having a wide focus change range and capable of high-speed focus change, and an optical apparatus including the active reflective lens.

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

1 is an example of a configuration diagram of an active reflective lens according to an embodiment of the present invention.
2 is a cross-sectional view illustrating the structure of an active reflective lens according to an embodiment of the present invention.
3A to 3C are cross-sectional views illustrating a method of designing and driving an active reflective lens according to an exemplary embodiment of the present invention.
4A and 4B are cross-sectional views illustrating a method of designing and driving an active reflective lens according to another embodiment of the present invention.
5A and 5B are cross-sectional views illustrating a method of designing and driving an active reflective lens according to another embodiment of the present invention.
6A and 6B are cross-sectional views illustrating a method of designing and driving an active reflective lens according to another embodiment of the present invention.
7A and 7B are cross-sectional views illustrating a method of designing and driving an active reflective lens according to another embodiment of the present invention.
8 is a view showing an example of an optical system including an active emission lens according to an embodiment of the present invention.
9 is a view showing another example of an optical system including an active reflective lens according to an embodiment of the present invention.

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

In describing the embodiments, descriptions of techniques which are well known in the art to which the embodiments of the present invention belong, and which are not directly related to the embodiments of the present specification are not described. This is for the sake of clarity of the gist of the embodiment of the present invention without omitting the unnecessary explanation.

When an element is referred to herein as being "connected" or "connected" to another element, it may mean directly connected or connected to the other element, Element may be present. In addition, the content of "including" a specific configuration in this specification does not exclude a configuration other than the configuration, and means that additional configurations can be included in the scope of the present invention or the scope of the present invention.

Also, the terms first, second, etc. may be used to describe various configurations, but the configurations are not limited by the term. The terms are used for the purpose of distinguishing one configuration from another. For example, without departing from the scope of the present invention, the first configuration may be referred to as the second configuration, and similarly, the second configuration may be named as the first configuration.

In addition, the components shown in the embodiments of the present invention are shown independently to represent different characteristic functions, and do not mean that each component is composed of separate hardware or one software constituent unit. That is, each constituent unit is included in each constituent unit for convenience of explanation, and at least two constituent units of each constituent unit may form one constituent unit or one constituent unit may be divided into a plurality of constituent units to perform a function. The integrated embodiments and the separate embodiments of each component are also included in the scope of the present invention unless they depart from the essence of the present invention.

In addition, some of the components are not essential components to perform essential functions in the present invention, but may be optional components only to improve performance. The present invention can be implemented only with components essential for realizing the essence of the present invention, except for the components used for the performance improvement, and can be implemented by only including the essential components except the optional components used for performance improvement Are also included in the scope of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the following description of the embodiments of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present disclosure rather unclear. DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. The following terms are defined in consideration of the functions of the present invention, and these may be changed according to the intention of the user, the operator, or the like. Therefore, the definition should be based on the contents throughout this specification.

An active reflective lens according to an embodiment of the present invention may include a thin flexible film layer including a shape variable material, for example, an electroactive polymer. The film layer may serve as a lens, and the reflective region may be coated with a metal film. When the coated metal film is used as an electrode, a voltage may be applied to the metal film and an electrode formed on the upper surface of the base to form an electric field. Thus, the curvature can be created in the film layer by the electric field. When the curvature of the film layer is formed as described above, the film layer is deformed in the direction in which the electromagnetic field is formed, so it is necessary to secure a space for the deformation. And the periphery of the coated film layer can be fixed with a support. In the case of an active reflective lens according to an embodiment of the present invention, when the film layer forms a curved surface by an electromagnetic field, a curved surface of the film layer is corrected by modifying the shape of the base portion having the electrode, thereby correcting the aberration problem. Therefore, the active reflective lens according to an embodiment of the present invention includes a lens portion coated with a reflective film on a flexible film serving as a lens, a support portion securing a space around the lens portion of the lens portion, A base portion including one electrode layer and having an important role in determining the shape of the curved surface of the lens, and a power portion including a controller for controlling the electrode to provide an electrical signal.

Hereinafter, embodiments of the present invention will be described in detail.

1 is an example of a configuration diagram of an active reflective lens according to an embodiment of the present invention.

Referring to FIG. 1, an active reflective lens according to an exemplary embodiment of the present invention may include a lens structure and a power supply unit 130. At this time, the lens structure may include a support part 110 and a lens part 120. [ Further, although not shown, the lens structure may further include a base portion. Meanwhile, the power supply unit 130 may apply a voltage to the lens structure through at least one electrode 140, 150, and 160. The power supply unit 130 may include a controller for controlling the lens structure to provide an electrical signal.

At this time, when a voltage is applied from the power supply unit 130, an electric field may be formed in the lens structure accordingly. In accordance with the formed electric field, the lens portion 120 in the form of a film can be formed into a convex or concave shape with respect to the support portion 110 fixed above and below the film layer.

2 is a cross-sectional view illustrating the structure of an active reflective lens according to an embodiment of the present invention.

Referring to FIG. 2, the lens structure according to an exemplary embodiment of the present invention includes a support 210, a lens 220, a base 230, a first electrode 240, and a second electrode 250. In addition, the lens structure may further include a third electrode 260 for aberration correction.

The lens unit 220 includes a deformable material according to an electrical signal, and the focal length is changed according to the deformed shape. For example, the lens portion 220 may comprise a dielectric material and may have a thin, flexible film form. The lens unit 220 is supported by the support unit 210 and the lens unit 220 may be sandwiched between the lower support unit 210A and the upper support unit 210B. The lens portion 220 includes a driving region in which the shape is deformed and a non-driving region in which the shape is not changed. Therefore, the supporting part 210 fixes the non-driving area of the lens part 220 and includes an opening at a position corresponding to the driving area of the lens part 220. [ Accordingly, the reflective region of the lens portion 220 is exposed, and the shape of the driving region of the lens portion 220 can be changed according to the electrical signal. The first electrode 240 may be formed in a reflective region of the lens unit 220. In other words, the first electrode 240 may be formed in the driving region of the lens unit 220 exposed by the opening of the supporting unit 210. For example, the first electrode 240 may be a metal film coated on a part of the upper surface of the lens portion 220. In addition, the first electrode 240 may be extended to be electrically connected to the power supply unit 130. Accordingly, a voltage may be applied from the power supply unit 130 to the first electrode 240. [

The base portion 230 may be disposed under the lens portion 220 and the support portion 210 and may include a deformable material according to an electrical signal. A second electrode 250 is formed on the base 230. Here, the second electrode 250 may be formed at a position corresponding to the first electrode 240, and extended to be electrically connected to the power source unit 130. Accordingly, a voltage may be applied from the power supply unit 130 to the second electrode 250. [ In addition, a third electrode 260 may be formed under the base 230. Here, the third electrode 260 may be formed at a position corresponding to the second electrode 250, and extended to be connected to the power supply unit 130. For example, the first to third electrodes 240 to 260 may be insulated from each other, and the power supply unit 130 may apply a voltage to the first to third electrodes 240 to 260, respectively.

The distance between the first electrode 240 and the second electrode 250 is determined according to the shape of the upper surface of the base 230. The distance between the first electrode 240 and the second electrode 250 may be different depending on the area of the lens unit 230 when the upper surface of the base 230 has a concave shape or a convex shape . The distance between the first electrode 240 and the second electrode 250 is close to the axial center of the lens unit 230 and the distance from the edge of the driving area of the lens unit 230 The distance between the first electrode 240 and the second electrode 250 is long. The distance between the first electrode 240 and the second electrode 250 is long at the center of the axis of the lens unit 230 and the edge of the driving area of the lens unit 230 The distance between the first electrode 240 and the second electrode 250 is near.

2, the upper surface of the base 230 is convex in the direction of the lens 220, but the present invention is not limited thereto. Depending on the embodiment, the top surface of the base portion 230 may be flat or concave. The upper surface of the base 230 may have a convex, concave or flat shape as a whole, or may have a convex, concave, or flat shape only in a region corresponding to the driving region of the lens portion 220. It is also possible that only the second electrode 250, the third electrode 260, or both may be formed on the base 230.

According to the structure as described above, the shape of the lens unit 220 can be changed according to the electric signal to adjust the focal distance and correct the aberration. Particularly, depending on the material of the lens part 220 and the shape of the base part 230, the lens part 220 in a flat state can be deformed into a convex or concave shape.

The lens portion 220 may include a polymer, for example, an elastomer having excellent restoring force. Accordingly, when a voltage is applied to the first electrode 340 and the second electrode 350 by the power supply unit 130, an electrostatic force is generated between the first electrode 340 and the second electrode 350, , The shape of the lens unit 220 interposed between the first electrode 340 and the second electrode 350 is changed. At this time, the shape of the lens unit 220 may be changed depending on the dielectric constant or physical properties of the material of the lens unit 220.

In addition, the base 230 may include a functional polymer, for example, an electro-active polymer having a dielectric property. The electroactive polymer is a material that can be deformed by an electric signal and can change its shape in response to an electrostatic force formed between dielectric polymers. In this case, the second electrode 250 is formed on the upper surface of the base 230, and the third electrode 260 is formed on the lower surface of the base 230. Therefore, when a voltage is applied to the second electrode 250 and the third electrode 260 by the power supply unit 130, an electrostatic force is formed between the second electrode 250 and the third electrode 260, The base portion 230 interposed between the second electrode 250 and the third electrode 260 is deformed.

Here, the first to third electrodes 240 to 260 may be formed of a flexible material, and may include carbon rubber, carbon nano-composite, and silver nanowire. Accordingly, the first to third electrodes 240 to 260 may be deformed in accordance with the deformation of the lens unit 220 and the base unit 230. For example, when the upper surface of the base 230 is deformed, the curvature of the second electrode 250 is changed, and the curvature of the first electrode 240 is changed according to the curvature of the changed second electrode 250 . The lens unit 220 is first deformed by the electrostatic force between the first electrode 240 and the second electrode 250 and then the electrostatic force between the second electrode 250 and the third electrode 260 is applied to the base unit 230 ). In this case, since the curvature of the first electrode 240 is changed according to the curvature change of the second electrode 250, the lens unit 220 can be secondarily deformed. Therefore, the curvature of the lens portion 220 can be finely controlled to correct the aberration. In addition, the first electrode 240 may be formed of a metal coating film having a clean surface to serve as a reflective surface. Further, in order to prevent a crack from occurring due to the curvature deformation, it is possible to form a metal coating film with a small thickness or to perform an additional surface treatment process after forming a metal coating film.

On the other hand, the electroactive polymer constituting the lens part 220 and / or the base part 230 is a substance that causes physical deformation due to movement or diffusion of ions or charges, arrangement of dipoles or electrostatic force when a voltage or an electric charge is applied. The electroactive polymer may be a kind of functional polymer that generates electrical energy when subjected to physical deformation. As an example, the electroactive polymer may comprise an ionic electroactive polymer (ionic EAP) or an electroactive electroactive polymer (electronic EAP).

Here, the ionic electroactive polymer may be a polymer that causes shrinkage or swelling due to migration and diffusion of ions upon voltage application. The ionic electroactive polymer may be selected from the group consisting of electrorheological fluid (ERF), carbon nanotube (CNT), conducting polymer (CP), ionic polymer metal composite (IPMC) , And an ionic polymer gel (IPG).

In addition, the electroactive electroactive polymer may be a polymer causing shrinkage or swelling due to an electron polarization phenomenon when electric energy is applied. Also, the electroactive electroactive polymer may be a liquid crystal elastomer (LCE), an electro-viscoelastic elastomer, a dielectric elastomer (EP), a ferroelectric polymer, an electrostrictive a graft elastomer, and an electrostrictive paper.

In another example, an electroactive polymer may comprise a dielectric that transmits electrical polarity but does not transfer electrons.

3A to 3C are cross-sectional views illustrating a method of designing and driving an active reflective lens according to an exemplary embodiment of the present invention. Hereinafter, a method of designing the base portion 330 of the active reflective lens including the supporting portion 310, the lens portion 320, the base portion 330, and the first to third electrodes 340 to 360 will be described. In each figure, " G " indicates a ground state or a state where electric potential is 0 (V).

The shape of the curved surface of the deformed lens portion 320 is affected by the intensity of the voltage or capacitance applied to the first to third electrodes 340 to 360, and the strength of the electrostatic force. Therefore, when the distance between the first electrode 340 and the second electrode 350 is the same in the entire region of the lens portion 320, the lens portion 320 can not be deformed into a perfect spherical surface. For example, the spherical surface of the deformed lens portion 320 may be less convex than the spherical surface of the general convex lens, or may be less concave than the spherical surface of the general concave lens. On the contrary, when the distance between the first electrode 340 and the second electrode 350 has a gradient, the spherical surface of the lens unit 320 may not change to a focal length region desired by the user. In both cases, aberrations occur.

Thus, according to one embodiment of the present invention, the initial state of the base 330 is formed into a convex or concave shape. In this way, the lens portion 320 can have a perfect spherical surface in the initial state. Alternatively, an electric signal of a specific area can be inputted to deform the lens part 320 according to a focal length range desired by the user. The distance between the first electrode 340 and the second electrode 350 is varied according to the area of the lens unit 320 so as to correct the aberration or to accurately control the variable focal length region. . For example, if the spherical surface of the deformed lens portion 320 is less concave, the base portion 330 may be designed to have a convex shape toward the lens portion 320, so that the spherical surface of the lens portion 320 may have a concave shape Respectively. As another example, when the spherical surface of the deformed lens portion 320 is less convex, the spherical surface of the lens portion 320 can be deformed to be more convex by raising the axial center of the base portion 330. [

Referring to FIG. 3A, the lens unit 320 maintains a flat state in an initial state in which no voltage is applied to the first through third electrodes 340 through 360. Thus, it represents a mirror-like image.

3B, when the second and third electrodes 350 and 360 are grounded and a positive voltage or an electric charge is applied to the first electrode 340, So that attractive force is generated between the second electrodes 350. At this time, the distance between the first electrode 340 and the second electrode 350 is different according to the shape of the base portion 330, so that the electrostatic force applied to the region of the lens portion 320 is different. For example, since the distance between the first electrode 340 and the second electrode 350 is close to the center of the lens unit 320, the attraction force is strong. On the other hand, since the distance between the first electrode 340 and the second electrode 350 is long at the edge of the lens portion 320, the attractive force is weak. Accordingly, the lens portion 320 is deformed into a concave-shaped lens.

3C, when the third electrode 360 is grounded and a positive voltage or an electric charge is applied to the first and second electrodes 340 and 350, the first electrode 340 and the second electrode 340, (350). At this time, the distance between the first electrode 340 and the second electrode 350 is different according to the shape of the base portion 330, so that the electrostatic force applied to the region of the lens portion 320 is different. For example, since the distance between the first electrode 340 and the second electrode 350 is close to the center of the lens unit 320, repulsive force is strong. On the other hand, since the distance between the first electrode 340 and the second electrode 350 is long at the edge of the lens portion 320, the repulsive force is weak. Therefore, the lens portion 320 is deformed into a convex-shaped lens.

According to an embodiment of the present invention, by adjusting the type, intensity, and the like of a voltage applied to the first to third electrodes 340 to 360 as well as the shape of the base 330, You can adjust the distance from minus to infinity, from infinity to plus.

4A and 4B are cross-sectional views illustrating a method of designing and driving an active reflective lens according to another embodiment of the present invention. In each figure, " G " indicates a ground state or a state where electric potential is 0 (V).

In the embodiment described with reference to FIGS. 3A to 3C, a description has been given of the case where the base portion 430 maintains the initial shape. In the present embodiment, a case where the initial shape of the base portion 430 is deformed will be described. The active reflective lens according to the present embodiment includes a supporting portion 410, a lens portion 420, a base portion 430, and first to third electrodes 440 to 460. In addition, the base portion 430 includes a material that is deformed in response to an electrical signal, for example, an electroactive polymer. Accordingly, the shape of the base 430 is deformed according to the type and intensity of the voltage or charge applied to the second electrode 450 and the third electrode 460.

4A, a negative voltage or a charge is applied to the first electrode 440 and a positive voltage is applied to the second electrode 450 to form the first electrode 440 and the second electrode 450, (450). At this time, attraction occurs according to the initial shape of the base 430. When the base 430 has an excessively convex shape, the axis center of the curved surface of the lens 420 protrudes excessively downward to cause a larger aberration .

Referring to FIG. 4B, the third electrode 460 is grounded or has a zero potential to generate an electrostatic force between the second electrode 450 and the third electrode 460. In this case, the shape of the base 430 is deformed by the electrostatic force, and the curvature of the second electrode 450 is changed accordingly. In addition, the curvature of the first electrode 440 is changed according to the curvature of the changed second electrode 450, and thus the shape of the lens portion 420 is deformed. That is, it is possible to correct that the center of the curved surface of the lens unit 420 protrudes excessively downward, and consequently, aberrations can be partially or completely corrected.

According to the structure as described above, the shape of the base 430 can be changed in real time by adjusting the amount of charge charged to the second electrode 450 and the third electrode 460. For example, by adjusting the intensity of the electrostatic force applied to the base portion 430, the shape of the region corresponding to the driving region of the lens portion 420 in the base portion 430 can be changed. Therefore, the convex portion of the base portion 430 can be further convexly deformed or the height of the convex portion of the base portion 430 can be lowered. Therefore, erroneous deformation of the lens portion 420 can be corrected easily.

5A and 5B are cross-sectional views illustrating a method of designing and driving an active reflective lens according to another embodiment of the present invention. In each figure, " G " indicates a ground state or a state where electric potential is 0 (V).

In the embodiment described above with reference to FIGS. 2 to 4B, the upper surface of the base portions 230 to 430 has a convex shape, but this is for convenience of explanation, and the present invention is not limited thereto. The initial shape of the base portion 530 can be variously designed according to the variable state of the lens portion 520. [ The active reflective lens includes the supporting portion 510, the lens portion 520, the base portion 530 and the first to third electrodes 540 to 560 and the base portion 530 is deformed Material, and the initial shape of the base portion 530 has a concave shape.

5A, a negative voltage or charge is applied to the first electrode 540 and a positive voltage or charge is applied to the second electrode 550 to form the first electrode 540 and the second electrode 550, Two electrodes 550 generate attraction force. At this time, attraction occurs according to the initial shape of the base portion 530, and when the base portion 530 has a less concave shape, the distance between the first electrode 540 and the second electrode 550 at the center of the lens portion 520 The distance is near. Accordingly, the center of the axis of the curved surface of the lens portion 520 may protrude excessively downward, and aberration may occur accordingly.

Referring to FIG. 5B, the third electrode 560 is grounded or a potential of 0 is generated to generate an electrostatic force between the second electrode 550 and the third electrode 560. In this case, the shape of the base portion 530 is deformed by the electrostatic force, and the height of the region corresponding to the axis center of the lens portion 520 is lowered. That is, the base portion 530 is compressed to have a more concave shape. In this case, the distance between the first electrode 540 and the second electrode 550 increases, and the attracting force at the center of the axis of the lens unit 520 is reduced. Therefore, it is possible to correct that the axial center of the curved surface of the lens portion 520 protrudes excessively downward, and thus the aberration can be corrected in whole or in part.

6A and 6B are cross-sectional views illustrating a method of designing and driving an active reflective lens according to another embodiment of the present invention. In each figure, " G " indicates a ground state or a state where electric potential is 0 (V).

In this embodiment, the active reflective lens includes a supporting portion 610, a lens portion 620, a base portion 630, and first to third electrodes 640 to 660, and the base portion 630 is deformed Material, and the initial shape of the base portion 630 has a convex shape.

6A, a positive voltage or an electric charge is applied to the first electrode 640 and a positive voltage or electric charge is applied to the second electrode 650 to form the first electrode 640 and the second electrode 650, And generates a repulsive force between the two electrodes (650). At this time, a repulsive force is generated according to the initial shape of the base portion 630, and if the base portion 630 has an excessively convex shape, the axial center of the curved surface of the lens portion 620 may protrude excessively.

Referring to FIG. 6B, the third electrode 660 is grounded to generate an electrostatic force between the second electrode 650 and the third electrode 660. In this case, the shape of the base portion 630 is deformed by the electrostatic force. For example, an area corresponding to the driving area of the lens unit 620 in the base unit 630 is pressed and lowered in height. That is, the base portion 630 has a less convex shape. Therefore, it is possible to correct that the center of the axis of the curved surface of the lens portion 620 protrudes excessively, so that a part or all of the generated aberration can be corrected.

7A and 7B are cross-sectional views illustrating a method of designing and driving an active reflective lens according to another embodiment of the present invention. In each figure, " G " indicates a ground state or a state where electric potential is 0 (V).

In this embodiment, the active reflective lens includes a supporting portion 710, a lens portion 720, a base portion 730 and first to third electrodes 740 to 760, and the base portion 730 is deformed Material, and the initial shape of the base portion 730 has a concave shape.

7A, a positive voltage or an electric charge is applied to the first electrode 740 and a positive voltage or electric charge is applied to the second electrode 750 to form the first electrode 740 and the second electrode 750, Two electrodes 750 generate a repulsive force. At this time, a repulsive force is generated according to the initial shape of the base portion 730, and the center of the axis of the curved surface of the lens portion 720 may protrude excessively when the base portion 730 has a less concave shape.

Referring to FIG. 7B, the third electrode 760 is grounded to generate an electrostatic force between the second electrode 750 and the third electrode 760. In this case, the shape of the base portion 730 is deformed by the electrostatic force. For example, an area corresponding to the driving area of the lens part 720 in the base part 730 is pressed and lowered in height. That is, the bottom portion 730 has a more concave shape. Accordingly, it is possible to correct that the center of the axis of the curved surface of the lens portion 720 protrudes excessively, so that some or all of the generated aberrations can be corrected.

In the drawings illustrated in FIGS. 1 to 7B, the upper surfaces of the base portions 230 to 730 are illustrated as hemispherical convex or concave shapes, but the present invention is not limited thereto. For example, the upper surface of the base portions 230 to 730 may include a plurality of protrusions in a convex shape, or may include a plurality of protrusions in a concave shape. It is also possible to have various convex / concave shapes such as a hexahedron shape and a tetrahedron shape.

8 is a view showing an example of an optical system including an active emission lens according to an embodiment of the present invention.

8, an optical system (or imaging system) according to an embodiment of the present invention may include an active reflective lens 810, an image sensor 820, and the like according to any one of the above embodiments. At this time, when light is incident on the active reflective lens 810 according to an embodiment of the present invention at an angle of 45 degrees or at an angle, the light reflected by the active reflective lens 810 may be incident on the image sensor 820 have.

9 is a view showing another example of an optical system including an active reflective lens according to an embodiment of the present invention.

9, an optical system (or imaging system) according to an embodiment of the present invention includes an active reflective lens 910, an image sensor 920, and a beam splitter 930, etc. according to any of the embodiments described above . ≪ / RTI > In this case, the light can be vertically incident on the active reflective lens 910. At this time, the beam splitter 930 may transmit a certain intensity of incident light and reflect the remaining portion. For example, the reflectance and transmission of the beam splitter 930 can be varied to 50:50, 30:70, etc., depending on the application of the system. Since the structure shown in FIG. 9 is such that light is incident perpendicularly on the active reflective lens 910, the system configuration is easy and the aberration can be reduced.

The actually applied imaging system may include various elements of the structure illustrated in FIG. 8 and / or FIG. 9, that is, focus variable lenses (i.e., active reflective lenses) 810 and 910, image sensors 820 and 920 ), Beam splitter 930, and the like.

Also, the active reflective lens according to one embodiment of the present invention can be applied to various optical devices such as a camera, a portable terminal, a projector, and a TV.

The embodiments disclosed in the present specification and drawings are merely illustrative of specific examples for the purpose of easy explanation and understanding, and are not intended to limit the scope of the present invention. It is to be understood by those skilled in the art that other modifications based on the technical idea of the present invention are possible in addition to the embodiments disclosed herein.

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 embodiments, but, on the contrary, And is not intended to limit the scope of the invention. It is to be understood by those skilled in the art that other modifications based on the technical idea of the present invention are possible in addition to the embodiments disclosed herein.

210: Support part 220:
230: base portion 240: first electrode
250: second electrode 260: third electrode

Claims (14)

A lens unit including a deformable material according to an electrical signal;
A support for supporting the lens unit;
A base portion formed at a lower portion of the support portion;
A first electrode formed on the lens unit; And
And a second electrode
/ RTI >
The distance between the first electrode and the second electrode is determined according to the shape of the upper surface of the base portion, and the distance between the first electrode and the second electrode is different according to the region of the lens portion
Active reflective lens.
The method according to claim 1,
The lens unit is deformed by an electrostatic force between the first electrode and the second electrode, and electrostatic forces of different intensities are applied according to an area of the lens unit
Active reflective lens.
The method according to claim 1,
And a third electrode formed on a lower surface of the base portion, wherein the second electrode is formed on an upper surface of the base portion, and a distance between the second electrode and the third electrode is determined according to a thickness of the base portion felled
Active reflective lens.
The method of claim 3,
Wherein the base includes a deformable material according to an electrical signal and is deformed by an electrostatic force between the second electrode and the third electrode
Active reflective lens.
5. The method of claim 4,
The base is deformed depending on the dielectric constant or physical properties of the deformable material
Active reflective lens.
5. The method of claim 4,
The curvature of the second electrode is changed according to the deformation of the base, and the curvature of the first electrode is changed according to the curvature of the second electrode
Active reflective lens.
The method according to claim 6,
Wherein the first electrode is made of a metal that can be reflected even after the lens unit is deformed
Active reflective lens.
The method according to claim 6,
Wherein the second electrode and the third electrode comprise a flexible material
Active reflective lens.
The method according to claim 1,
In an initial state in which no voltage is applied to the first electrode and the second electrode, the upper surface of the base portion is curved
Active reflective lens.
The method according to claim 1,
Wherein the lens portion includes a driving region and a non-driving region, the supporting portion includes an opening exposing the driving region, and the non-
Active reflective lens.
The method according to claim 1,
When attraction is generated between the first electrode and the second electrode, the lens part is deformed into a concave lens
Active reflective lens.
The method according to claim 1,
When a repulsive force is generated between the first electrode and the second electrode, the lens portion is deformed into a convex lens
Active reflective lens.
The method according to claim 1,
A power supply unit for applying a voltage to the first electrode and the second electrode,
Further comprising an active reflective lens.
An optical device including an active reflective lens,
A lens unit including a deformable material according to an electrical signal;
A support for supporting the lens unit;
A base portion formed at a lower portion of the support portion;
A first electrode formed on the lens unit; And
And a second electrode
/ RTI >
The distance between the first electrode and the second electrode is determined according to the shape of the upper surface of the base portion, and the distance between the first electrode and the second electrode is different according to the region of the lens portion
Optical device.

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