WO2020242135A1 - Lentille liquide et ensemble lentille la comprenant - Google Patents

Lentille liquide et ensemble lentille la comprenant Download PDF

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Publication number
WO2020242135A1
WO2020242135A1 PCT/KR2020/006655 KR2020006655W WO2020242135A1 WO 2020242135 A1 WO2020242135 A1 WO 2020242135A1 KR 2020006655 W KR2020006655 W KR 2020006655W WO 2020242135 A1 WO2020242135 A1 WO 2020242135A1
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WIPO (PCT)
Prior art keywords
lens
liquid
plate
liquid lens
disposed
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PCT/KR2020/006655
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English (en)
Korean (ko)
Inventor
배진우
Original Assignee
엘지이노텍(주)
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Publication of WO2020242135A1 publication Critical patent/WO2020242135A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/12—Fluid-filled or evacuated lenses
    • G02B3/14—Fluid-filled or evacuated lenses of variable focal length
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
    • G02B7/021—Mountings, adjusting means, or light-tight connections, for optical elements for lenses for more than one lens
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
    • G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification

Definitions

  • Embodiments relate to a liquid lens and a lens assembly comprising the liquid lens.
  • 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.
  • an optical zoom function zoom-in/zoom-out
  • AF auto-focusing
  • OIS image stabilization or image stabilization
  • 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.
  • the embodiment is to provide a liquid lens capable of expressing excellent optical performance in various environments, a simple manufacturing process and low manufacturing cost, and a lens assembly including the liquid lens.
  • a liquid lens includes: a first plate including a cavity positioned on an optical axis; A first non-conductive liquid disposed in the cavity; A second non-conductive liquid disposed above the first non-conductive liquid in the cavity and in contact with the first non-conductive liquid; A first electrode spaced apart from the optical axis, disposed in contact with an inner surface of the first plate, and contacting the first and second non-conductive liquids, respectively; And a second electrode disposed on the first plate and spaced apart from the first electrode, and in contact with the second non-conductive liquid.
  • the first non-conductive liquid may directly contact the bottom surface of the cavity on the optical axis.
  • the first electrode may include a first portion disposed on the inner surface; And a second portion extending from the first portion, disposed on a bottom surface of the cavity, and spaced apart from the optical axis.
  • the liquid lens may include a second plate forming the cavity together with the first plate.
  • the second electrode may include a first portion disposed between the first plate and the second plate; And a second portion extending from the first portion and contacting the second non-conductive liquid.
  • the second portion of the second electrode may be disposed between the entire lower surface of the second plate on the cavity and the second non-conductive liquid.
  • the second portion of the second electrode may be disposed between a portion of the entire lower surface of the second plate on the cavity and the second non-conductive liquid.
  • the first electrode and the second electrode may have a symmetrical cross-sectional shape in a direction orthogonal to the optical axis.
  • an interface between the first non-conductive liquid and the second non-conductive liquid may contact the inner surface.
  • the first dielectric constant of the first non-conductive liquid may be greater than the second dielectric constant of the second non-conductive liquid.
  • the liquid lens and the lens assembly including the liquid lens according to the embodiment use a non-conductive liquid instead of a water-based electrolyte, the deformation of the second plate is minimized at various temperatures or various driving voltage ranges, thereby improving optical performance. It can be improved.
  • liquids are non-conductive instead of a water-based electrolyte, electrolysis does not occur, and thus an insulating layer is not required, thus simplifying the manufacturing process.
  • manufacturing process time and cost can be reduced, microbubbles and liquid evaporation can be prevented during voltage driving, low power consumption can be maintained, high operating voltage can be endured, and low operating voltage can be achieved.
  • the liquid lens and the lens assembly including the liquid lens according to the embodiment change the shape of the interface by the dielectric force to be convex or concave under the influence of a non-uniform electric field, so that the focal length can be adjusted from positive to negative or vice versa. It can be applied to a zoom lens system or a 2D-3D switchable display to obtain a large magnification thanks to this wide range of changes in the focal length.
  • liquid lens and the lens assembly including the liquid lens according to the embodiment do not have an insulating layer disposed on the optical axis, transmittance of light may be improved.
  • FIG. 1 is a cross-sectional view of a liquid lens module including a liquid lens according to an embodiment.
  • FIG. 2 is a cross-sectional view of a liquid lens module according to another embodiment.
  • FIG 3 is a cross-sectional view of a liquid lens module according to another embodiment.
  • FIG. 4 is a cross-sectional view of a liquid lens module according to another embodiment.
  • FIG. 5 is a cross-sectional view of a liquid lens module according to another embodiment.
  • FIG. 6 is a block diagram of a camera module according to an embodiment.
  • FIG. 7 is a cross-sectional view of the camera module shown in FIG. 6 according to an embodiment.
  • FIG. 8 is a cross-sectional view of a liquid lens module according to a comparative example.
  • FIG. 9A is a cross-sectional view of a camera module according to a comparative example
  • FIG. 9B is a cross-sectional view of a camera module according to the embodiment.
  • FIG. 10 is a schematic block diagram of an optical device according to an embodiment.
  • 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.
  • 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.
  • the meaning of not only an upward direction but also a downward direction based on one component may be included.
  • the variable lens may be a variable focus lens. Also, the variable lens may be a lens whose focus is adjusted.
  • the variable lens may be at least one of a liquid lens, a polymer lens, a liquid crystal lens, a VCM type, and an SMA type.
  • the liquid lens may include a liquid lens including one liquid and a liquid lens including two liquids.
  • a liquid lens containing one liquid may change the focus by adjusting a membrane disposed at a position corresponding to the liquid, and for example, the focus may be changed by pressing the membrane by electromagnetic force of a magnet and a coil.
  • a liquid lens including two liquids may control an interface formed between the conductive liquid and the non-conductive liquid by using a voltage applied to the liquid lens including a conductive liquid and a non-conductive liquid.
  • the polymer lens can change the focus of the polymer material through a driving unit such as piezo.
  • the liquid crystal lens can change the focus by controlling the liquid crystal by electromagnetic force.
  • the VCM type can change the focus by adjusting the solid lens or the lens assembly including the solid lens through the electromagnetic force between the magnet and the coil.
  • the SMA type can change focus by controlling a solid lens or a lens assembly including a solid lens using a shape memory alloy.
  • variable lens is a liquid lens
  • the embodiment is not limited thereto. That is, it goes without saying that the liquid lens according to the embodiment, the lens assembly including the liquid lens, and the camera module including the assembly may be applied to variable lenses other than the liquid lens.
  • a liquid lens according to an exemplary embodiment, a lens assembly including the liquid 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.
  • FIG. 1 is a cross-sectional view of a liquid lens module 100A including a liquid lens according to an exemplary embodiment.
  • a liquid lens module 100A may include a liquid lens and first and second connection substrates 141 and 144.
  • the liquid lens illustrated in FIG. 1 may include a plurality of plates, a first non-conductive material LQ1, a second non-conductive material LQ2, and first and second electrodes E1A and E2A.
  • the first non-conductive material LQ1 may be filled, accommodated, or disposed in at least a portion of the cavity CA.
  • the first non-conductive material LQ1 may be a non-conductive liquid (hereinafter referred to as “first non-conductive liquid”).
  • the second non-conductive material LQ2 may be disposed in contact with the first non-conductive liquid LQ1 in the cavity CA. As shown, the second non-conductive material LQ2 may be disposed on the first non-conductive liquid LQ1.
  • the second non-conductive material LQ2 may be a non-conductive liquid (hereinafter, referred to as “second non-conductive liquid”).
  • the first conductive liquid (LQ1) and the second non-conductive liquid (LQ2) are not mixed with each other, and an interface (BO) may be formed in a contact portion between the first conductive liquid (LQ1) and the second non-conductive liquid (LQ2). have.
  • the interface BO between the first non-conductive liquid LQ1 and the second non-conductive liquid LQ2 may contact the inner surface i of the first plate P1.
  • the inner surface i may be formed so that the flowing interfaces BO1 and BO2 do not deviate from the inner surface i.
  • At least one of dielectric constant, refractive index, density, or color of the first and second non-conductive liquids LQ1 and LQ2 may be different from each other.
  • the first dielectric constant of the first non-conductive liquid LQ1 may be greater than the second dielectric constant of the second non-conductive liquid LQ2.
  • the first refractive index of the first non-conductive liquid LQ1 may be smaller than the second refractive index of the second non-conductive liquid LQ2.
  • the first density of the first non-conductive liquid LQ1 and the second density of the second non-conductive liquid LQ2 may be similar to minimize the gravitational effect.
  • the colors of the first non-conductive liquid LQ1 and the second non-conductive liquid LQ2 may be the same or different from each other.
  • the first non-conductive liquid LQ1 and the second non-conductive liquid LQ2 may have characteristics as shown in Table 1 below, but embodiments are not limited thereto.
  • the first non-conductive liquid (LQ1) may be glycerol (Glycerol)
  • the second non-conductive liquid (LQ2) may be an optical fluid (Optical Fluids SL-5267, from Santovac Fluids), but embodiments are limited thereto. It doesn't work.
  • the first non-conductive liquid LQ1 may directly contact the bottom surface of the cavity CA at the optical axis LX (or around the optical axis LX and the optical axis LX).
  • the above-described cavity CA is located on the optical axis LX, and may be defined by at least one plate.
  • the plurality of plates may include first to third plates P1 to P3.
  • the first plate P1 may include a cavity CA positioned on the optical axis LX.
  • the first plate P1 may include an inner side surface i defining a side portion of the cavity CA.
  • 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. That is, as shown, the cavity CA has an inner surface i of the first plate P1, a lower surface P2L of the second plate P2, and an upper surface P3U of the third plate P3. Can be defined by
  • the diameter of the wider one among the first and second openings O1 and O2 depends on the FOV required by the liquid lens module 100A or the role to be played in the optical device including the liquid lens module 100A. It can be different.
  • 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.
  • 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).
  • 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.
  • 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.
  • 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.
  • the second plate P2 may be disposed above the cavity CA, and the third plate P3 may be disposed below the cavity CA.
  • the liquid lens module 100A 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.
  • the liquid lens module 100A 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.
  • the plate leg 148 may be integrally implemented with the same material as the second plate P2.
  • 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 area 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.
  • 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.
  • 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 exit 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 a configuration that allows light to be emitted in the opposite direction (that is, the incident light is suppressed). 1) may have a configuration that allows it to proceed into the cavity CA of the plate P1).
  • the second plate P2 may directly contact the second non-conductive liquid LQ2.
  • the actual effective lens area of the liquid lens module 100A 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.
  • the first electrode (or individual electrode) may be spaced apart from the optical axis LX, and may be disposed in contact with the inner surface i of the first plate P1.
  • the first electrode may be disposed to contact the first and second non-conductive liquids LQ1 and LQ2, respectively.
  • the second electrode (or common electrode) may be disposed on the first plate P1 to be spaced apart from the first electrode, and may be disposed in contact with the second non-conductive liquid LQ2. Unlike the first electrode, the second electrode does not contact the first non-conductive liquid LQ1.
  • the first electrode and the second electrode may have a cross-sectional shape symmetrical in a direction perpendicular to the optical axis LX (eg, at least one of an x-axis direction or a y-axis direction).
  • the first electrode may be a plurality of electrodes, and the second electrode may be one electrode.
  • the number of first electrodes may be 4 or 8, and the embodiment is not limited to a specific number of first electrodes.
  • the first and second electrodes according to the embodiment will be described with reference to FIGS. 1 to 5 as follows.
  • FIGS 2 to 5 are cross-sectional views of liquid lens modules 100B to 100E according to another embodiment.
  • To 100E) are the same as the liquid lens module 100A illustrated in FIG. 1, and thus descriptions of overlapping portions will be omitted.
  • the first electrode E1A may be disposed on the lower surface P1L, the inner surface i, and the upper surface P1U of the first plate P1, respectively. have. That is, the first electrode E1A is from between the first and third plates P1 and P3 to the upper surface P1U of the first plate P1 along the inner surface i of the first plate P1. It may extend and be disposed to be spaced apart from the second electrode E2A. In addition, the second electrode E2A may be disposed spaced apart from the first electrode E1A on the upper surface P1U of the first plate P1.
  • the first electrode E1A is disposed in contact with the first and second non-conductive liquids LQ1 and LQ2, respectively, while the second electrode E2A is in contact with the second non-conductive liquid LQ2, while the first It can be disposed without contact with the non-conductive liquid (LQ1).
  • the first electrode E1B may include a first portion E11 and a second portion E12 as illustrated in FIG. 2.
  • the first portion E11 is disposed on the inner surface i of the first plate P1.
  • the second portion E12 may extend from the first portion E11 toward the optical axis LX and may be disposed on the bottom surface of the cavity CA. As shown in FIG. 2, the second portion E12 is disposed to extend toward the optical axis LX, and may be disposed to be spaced apart from the optical axis LX.
  • the first electrode E1C includes only the first portion E11 and the second portion E12 may be omitted.
  • the second electrodes E2B, E2C, and E2D may include first and second portions.
  • the first portion E21 of the second electrode E2B, E2C, and E2D is between the first plate P1 and the second plate P2. Is placed.
  • the second portions E22A, E22B, and E22C of the second electrodes E2B, E2C, and E2D may extend from the first portion E21 to contact the second non-conductive liquid LQ2.
  • the second portion E22A of the second electrode E2B is the entire lower surface P2L of the second plate P2 above the cavity CA. It can be disposed between 2 non-conductive liquid (LQ2).
  • the second portions E22B and E22C of the second electrodes E2C and E2D are the entire lower surface P2L of the second plate P2 above the cavity CA. It may be disposed between a portion of the liquid and the second non-conductive liquid LQ2.
  • the second portion E22B of the second electrode E22B illustrated in FIG. 3 is spaced apart from the first plate P1 and disposed only on the lower surface P2L of the second plate P2.
  • the second part E22C of the second electrode E2D shown in FIG. 5 is in the optical axis direction from the lower surface P2L of the second plate P2L toward the first plate P1 (for example, It may be disposed extending in the z-axis direction).
  • the second portion E22C of the second electrode E2D shown in FIG. 5 is in the second non-conductive liquid LQ2 than the second portion E22B of the second electrode E2C shown in FIG. 3. You can reach more.
  • Each of the first electrodes E1A, E1B and E1C and the second electrodes E2A to E2D may be made of a light-transmitting conductive material.
  • each of the first electrodes E1A and E1C and the second electrodes E2A to E2D may be made of a light-transmitting and conductive material such as ITO (Indium Tin Oxide). Not limited.
  • a first connection substrate 141 may be electrically connected to an electrode pad formed on a main substrate (not shown) through a connection pad electrically connected to the first electrode E1A.
  • the second connection substrate 144 may be electrically connected to an electrode pad formed on the main substrate through a connection pad electrically connected to the second electrode E2A.
  • liquid lens modules 100B to 100E shown in FIGS. 2 to 5 are also the first and second connection substrates 141 and 144 having the same structure as the liquid lens module 100A shown in FIG. 1. It may include, but the embodiment is not limited thereto.
  • first connection board 141 may be implemented as a flexible printed circuit board (FPCB), and the second connection board 144 may be implemented as an FPCB or a single metal substrate (conductive metal plate).
  • FPCB flexible printed circuit board
  • the embodiment is not limited thereto.
  • the first connection substrate 141 may transmit a plurality of different voltages (hereinafter referred to as “individual voltages”) to the plurality of first electrodes E1A, respectively.
  • the second connection substrate 144 may transmit one driving voltage (hereinafter, referred to as “common voltage”) to the second electrode E2A.
  • the common voltage may include a DC voltage or an AC voltage.
  • the width or duty cycle of the pulse may be constant. That is, the driving voltage may be supplied to the liquid lens module 100A through the first connection substrate 141 and the second connection substrate 144.
  • the curvature of the interface BO formed in the liquid lens module 100A may be changed to perform an auto-focusing (AF) function, or the tilting of the interface BO Since the angle is changed, a camera shake correction or an image stabilization (OIS) function may be performed.
  • AF auto-focusing
  • OIS image stabilization
  • individual voltages equal to each other may be respectively transmitted to the plurality of first electrodes E1A through the first connection substrate 141.
  • OIS image stabilization
  • the configuration and operation of the liquid lens according to the embodiment is not limited to a specific arrangement or configuration of the first and second connection substrates 141 and 144. That is, the arrangement in which the first and second connection substrates 141 and 144 shown in FIG. 1 are arranged is only an example for helping understanding of the liquid lens module 100A.
  • liquid lens module 100A shown in FIG. 1 operates in the same manner as the liquid lens modules 100B to 100E shown in FIGS. 2 to 5.
  • the focal length (or focal length) of the liquid lens modules 100B to 100E is varied by varying the level (eg, the amount of charge) of the driving signal applied to the liquid lens modules 100B to 100E. Length) may vary. With this principle, the liquid lens modules 100B to 100E may be driven to perform an AF function.
  • the driving signal may correspond to a voltage difference between an individual voltage applied to the first electrodes E1: E1A to E1C and a common voltage applied to the second electrodes E2: E2A to E2D.
  • the liquid lens modules 100B to 100E may have a negative (-) focal length. That is, the flat interface BO as shown in FIG. 1 may be changed to the interface BO1 having a convex downward shape as shown in FIGS. 2 to 5.
  • the liquid lens modules 100B to 100E may have a positive focal length. That is, the flat interface BO as shown in FIG. 1 may be changed to an interface BO2 having a convex upward shape as shown in FIGS. 2 to 5.
  • the liquid lens modules 100A to 100E may have both positive (+) or negative (-) focal lengths according to the level of the driving signal.
  • the AF function may be performed by applying a driving signal to the liquid lens modules 100A to 100E.
  • the liquid lens modules 100A to 100E according to the above-described embodiment can be applied to various fields.
  • FIG. 6 is a block diagram of a camera module 200 according to an embodiment.
  • the camera module 200 may include a lens assembly 210 and an image sensor 220.
  • the lens assembly 210 may include at least one lens and a liquid lens 214.
  • the liquid lens 214 may mean a liquid lens included in the liquid lens modules 100A to 100E shown in FIGS. 1 to 5.
  • At least one lens may be aligned with the liquid lens 214 and the optical axis LX.
  • at least one lens may include a plurality of lenses, as illustrated in FIG. 6.
  • the plurality of lenses 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 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 a solid lens.
  • the liquid 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 exemplary embodiment, the liquid lens 214 may be disposed above the first lens unit 212 or may be disposed below the second lens unit 216. As such, the liquid lens 214 may be disposed between the plurality of lenses, above the plurality of lenses, and below the plurality of lenses.
  • liquid lens 214 may serve as any one of a plurality of lenses.
  • the image sensor 220 receives the opening of the liquid lens 214 (for example, the first and second openings O1 and O2 shown in FIG. 1) and the light that has passed through at least one lens to provide an image Data can be created.
  • the image sensor 220 may be aligned with the liquid lens 214 and at least one lens (eg, 212 and 216 shown in FIG. 6) along the optical axis LX.
  • the liquid lens 214 can serve as any one of a plurality of lenses, the number of lenses included in the lens assembly 210 can be reduced. Accordingly, the size of the lens assembly 210 may be reduced.
  • FIG. 7 is a cross-sectional view of the camera module 200 shown in FIG. 6 according to an embodiment 200A.
  • the camera module 200A includes a first lens unit 212A, a liquid lens 214A, a second lens unit 216A, an image sensor 220A, a main substrate 230 and a lens holder 240. It may include.
  • the first lens unit 212A, the liquid lens 214A, and the second lens unit 216A correspond to the embodiment of the lens assembly 210 illustrated in FIG. 6.
  • first lens unit 212A, the liquid lens 214A, the second lens unit 216A, and the image sensor 220A shown in FIG. 7 are the first lens unit 212 and the liquid lens shown in FIG. 214, the second lens unit 216, and the image sensor 220, respectively, and may perform the same function.
  • the structure of the lens assembly illustrated in FIG. 7 is only an example, and the structure of the lens assembly may vary according to specifications required for the camera modules 200 and 200A.
  • the liquid lens 214A is located between the first lens part 212A and the second lens part 216A, but in another example, the liquid lens 214A is the first lens part 212A. It may be located higher (or front or front), and one of the first lens unit 212A or the second lens unit 216A may be omitted.
  • the first lens unit 212A is disposed in front of the lens assembly, and is a portion where light is incident from the outside of the lens assembly.
  • the first lens unit 212A may be provided with at least one lens, or two or more lenses may be aligned with respect to a central axis (or optical axis) LX to form an optical system.
  • the first lens unit 212A and the second lens unit 216A may be mounted on the lens holder 240.
  • a through hole may be formed in the lens holder 240, and a first lens part 212A and a second lens part 216A may be disposed in the through hole.
  • the liquid lens 214A may be inserted into a space between the light beam in which the first lens part 212A is disposed in the lens holder 240 and the space in which the second lens part 216A is disposed.
  • the first lens unit 212A may include an exposure lens 213.
  • the exposure lens 213 refers to a lens that protrudes to the outside of the lens holder 240 and can be exposed to the outside.
  • the lens surface may be damaged due to exposure to the outside. If the lens surface is damaged, the image quality of the image captured by the camera module 200A may be deteriorated.
  • a method of disposing a cover glass, forming a coating layer, or configuring the exposed lens 213 of a wear-resistant material to prevent surface damage may be applied.
  • the second lens unit 216A is disposed behind the first lens unit 212A and the liquid lens 214A, and light incident from the outside to the first lens unit 212A is transmitted through the liquid lens 214A to be removed. 2 Can enter into the lens unit 216A.
  • the second lens part 216A may be spaced apart from the first lens part 212A and disposed in a through hole formed in the lens holder 240.
  • the second lens unit 216A may be provided with at least one lens, and when two or more lenses are included, the second lens unit 216A may be aligned with respect to the central axis LX to form an optical system.
  • the liquid lens 214A is disposed between the first lens unit 212A and the second lens unit 216A, and may be inserted into the insertion hole 242 of the lens holder 240.
  • the insertion hole 242 may be formed by opening a portion of the side surface of the lens holder 240. That is, the liquid lens 214A may be inserted and disposed through the insertion hole 242 on the side of the lens holder 240.
  • the liquid lens 214A may also be aligned with the central axis (or optical axis) LX like the first lens unit 212A and the second lens unit 216A.
  • the lens assembly may further include a first connection substrate 141 and a second connection substrate 144.
  • the interface BO between the first non-conductive liquid LQ1 and the second non-conductive liquid LQ2 is deformed (BO1, BO2) by a driving signal applied through the first and second connection substrates 141 and 144.
  • the curvature and focal length of the liquid lens 214A may be changed.
  • FIG. 8 shows a cross-sectional view of a liquid lens module 10 according to a comparative example.
  • the first liquid LQ1 of the liquid lens module 10 shown in FIG. 8 is a non-conductive liquid
  • the second liquid LQ2 is a conductive liquid
  • the liquid lens module 10 shown in FIG. 8 further includes an insulating layer 146. Except for this, the liquid lens module 10 according to the comparative example shown in FIG. 8 is the same as the liquid lens module 100A shown in FIG. 1.
  • the second liquid LQ2 having conductivity shown in FIG. 8 includes a water-based electrolyte (for example, a liquid in which ions such as salt are mixed in water in a certain amount or more), and has a non-conductive first liquid ( LQ1) may contain oil.
  • a driving signal is applied to the liquid lens module 10
  • ions are moved and the shape of the water-based electrolyte is changed by electrostatic attraction, thereby performing the AF function.
  • FIG. 9A is a cross-sectional view of a camera module according to a comparative example
  • FIG. 9B is a cross-sectional view of a camera module according to the embodiment.
  • the camera module according to the comparative example shown in FIG. 9A includes a first lens unit 212, a liquid lens module 10, a second lens unit 216, and an image sensor 220, and the implementation shown in FIG. 9B
  • the camera module according to the example includes a first lens unit 212, a liquid lens module 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 FIGS. 9A and 9B, respectively, are respectively shown in FIGS. 6 and 7.
  • the lens units 216 and 216A and the image sensors 220 and 220A perform the same functions, respectively.
  • the camera module according to the comparative example shown in FIG. 9A includes a liquid lens module 10.
  • the liquid lens module 10 illustrated in FIG. 9A may have a configuration as illustrated in FIG. 8.
  • the liquid lens module 214 of the camera module according to the embodiment illustrated in FIG. 9B may be any one of the liquid lens modules 100A to 100E illustrated in FIGS. 1 to 5.
  • the image sensor 220 shown in each of FIGS. 9A and 9B may correspond to an imaging surface of the image sensors 220 and 220A shown in FIGS. 6 and 7.
  • the water-based electrolyte (LQ2) included in the liquid lens module 10 according to the comparative example has a freezing point or melting point at 0° and a boiling point at 100°, and is electrolyzed when a voltage of 1.23V is applied as a driving signal. Has characteristics. For this reason, the liquid lens module 10 according to the comparative example has limitations in use in various environments. Specifically, the liquid lens module 10 according to the comparative example including the water-based electrolyte as the second liquid LQ2 cannot be used at a high temperature of 100° or more and a low temperature of 0° or less.
  • the second plate P2 receives stress due to thermal expansion according to the temperature, and the liquid lens module 10 as shown in FIG. 9A
  • One side 11 of the second plate P2 facing the image sensor 220 may be swollen 13 and deformed or even destroyed.
  • the stress applied to the second plate P2 may be minimized by reducing 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.
  • the second liquid LQ2 expands and the curvature of the second plate P2 gradually increases or decreases, so that the curvature 230 as shown in FIG. 9A. May cause deterioration in optical performance, such as a decrease in resolution.
  • the interface BO flows by an electrowetting method.
  • the electrowetting method when a driving voltage is applied to the first and second electrodes E1 and E2, the interface BO flows by an electrowetting method.
  • a reference voltage for example, a ground voltage
  • a positive voltage is applied to the first electrode E1
  • the insulating layer 146 and the first At the boundary of the liquid (LQ1), negative (-) charges are collected in the insulating layer 146, and positive (+) charges are collected in the second liquid (LQ2) near the interface (BO), and the interface (BO) flows.
  • the liquid lens module 10 according to the comparative example essentially requires the insulating layer 146, the manufacturing process is complicated, and the manufacturing process time and cost are increased.
  • the liquid lens module 10 according to the comparative example there is a problem that microbubbles and liquid evaporation occur due to hydrolysis occurring at a high voltage.
  • liquid lens of the liquid lens modules 100A to 100E according to the embodiment since both liquids LQ1 and LQ2 are non-conductive instead of a water-based electrolyte, electrolysis does not occur. Therefore, unlike the comparative example, since the liquid lens of the liquid lens module 100A to 100E according to the embodiment does not require the insulating layer 146, the manufacturing process is simplified, the manufacturing process time and cost can be reduced, and the voltage It can prevent microbubbles and liquid evaporation during operation, maintain low power consumption and withstand high operating voltage.
  • the curvature of the interface (BO) in the relaxed state is minimized, and due to the surface tension force of the liquids (LQ1, LQ2), the shape of the liquid (LQ1, LQ2) is bent and the surface is very smooth. I can.
  • a driving signal is applied, a non-uniform electric field is induced, so that the dielectric force acting on the liquid can be expressed as in Kelvin theory.
  • the liquid lens modules 100A to 100E according to the embodiment having such characteristics may have a lower operating voltage than the liquid lens module 10 according to the comparative example.
  • the liquid lens module 10 according to the comparative example has a focal length fixed to one of positive (+) and negative (-), the range of change in the focal length is relatively narrow.
  • the liquid lens modules 100A to 100E according to the embodiment under the influence of an uneven electric field, the shapes of the interfaces BO1 and BO2 are changed as shown in FIGS. 2 to 5 by dielectric force, Since the focal length can be adjusted from positive to negative or vice versa, the range of focal length change is wider than that of the comparative example. Accordingly, the liquid lens modules 100A to 100E according to the embodiment may be applied to a zoom lens system or a 2D-3D switchable display to obtain a large magnification.
  • the transmittance of light may decrease.
  • the transmittance of light may be improved compared to the comparative example.
  • an optical device may be implemented using the camera module 200 including a variable lens (eg, a liquid lens) according to the above-described embodiment.
  • 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, etc., including a lens assembly. This embodiment can be applied to an optical device capable of.
  • 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.
  • optical device 300 including a liquid 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.
  • FIG. 10 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.
  • the lens 320 may correspond to the liquid lens 214 included in the liquid lens modules 100A to 100E 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.
  • 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 liquid lens according to the embodiment and the lens assembly including the liquid 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.
  • 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.
  • Smartphones notebook computers, tablet computers, and other portable devices.

Abstract

Une lentille liquide selon un mode de réalisation comprend : une première plaque comprenant une cavité positionnée sur un axe optique; un premier liquide non conducteur disposé dans la cavité; un second liquide non conducteur disposé au-dessus du premier liquide non conducteur dans la cavité et en contact avec le premier liquide non conducteur; une première électrode éloignée de l'axe optique, disposée en contact avec la surface interne de la première plaque, et en contact avec chacun des premier et second liquides non conducteurs; et une seconde électrode disposée de manière à être éloignée de la première électrode sur la première plaque et en contact avec le second liquide non conducteur.
PCT/KR2020/006655 2019-05-24 2020-05-21 Lentille liquide et ensemble lentille la comprenant WO2020242135A1 (fr)

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KR1020190061144A KR102156378B1 (ko) 2019-05-24 2019-05-24 액체 렌즈 및 이 액체 렌즈를 포함하는 렌즈 어셈블리
KR10-2019-0061144 2019-05-24

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CN113709349B (zh) * 2021-09-02 2023-05-12 维沃移动通信有限公司 摄像组件和电子设备

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KR20070087940A (ko) * 2006-02-15 2007-08-29 삼성전기주식회사 신뢰성이 확보된 액체 렌즈용 절연액 및 그 절연액을사용한 액체 렌즈
KR20090084423A (ko) * 2008-02-01 2009-08-05 (주)미코엠에스티 웨이퍼 레벨 패키징을 이용한 액체 렌즈 제조 방법
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US20140347741A1 (en) * 2013-05-24 2014-11-27 Raymond Miller Karam Fabrication of liquid lens arrays

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