WO2020246769A1 - Module de caméra - Google Patents

Module de caméra Download PDF

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Publication number
WO2020246769A1
WO2020246769A1 PCT/KR2020/007135 KR2020007135W WO2020246769A1 WO 2020246769 A1 WO2020246769 A1 WO 2020246769A1 KR 2020007135 W KR2020007135 W KR 2020007135W WO 2020246769 A1 WO2020246769 A1 WO 2020246769A1
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WO
WIPO (PCT)
Prior art keywords
liquid lens
disposed
temperature
camera module
connection part
Prior art date
Application number
PCT/KR2020/007135
Other languages
English (en)
Korean (ko)
Inventor
전재훈
Original Assignee
엘지이노텍(주)
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Filing date
Publication date
Application filed by 엘지이노텍(주) filed Critical 엘지이노텍(주)
Publication of WO2020246769A1 publication Critical patent/WO2020246769A1/fr

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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B17/00—Details of cameras or camera bodies; Accessories therefor
    • G03B17/55—Details of cameras or camera bodies; Accessories therefor with provision for heating or cooling, e.g. in aircraft
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/12—Fluid-filled or evacuated lenses
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B17/00—Details of cameras or camera bodies; Accessories therefor
    • G03B17/02—Bodies
    • G03B17/12—Bodies with means for supporting objectives, supplementary lenses, filters, masks, or turrets
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B2217/00—Details of cameras or camera bodies; Accessories therefor
    • G03B2217/002—Details of arrangement of components in or on camera body

Definitions

  • the embodiment relates to a camera module.
  • 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 fixed to the lens holder and aligned with the optical axis in the vertical direction of the optical axis or optical axis, and for this purpose, a lens assembly composed of a plurality of lenses is driven.
  • a separate lens driving device is required.
  • the lens driving device consumes high power, and in order to protect it, a cover glass must be added separately from the camera module, thereby increasing the overall size of the existing camera module.
  • research on a liquid lens unit that performs autofocus and camera shake correction functions by electrically controlling the curvature of the interface between two liquids has been conducted.
  • the liquid lens unit In general, heat is generated during operation of the liquid lens unit, and if the temperature of the liquid lens unit is not managed, the liquid lens unit may not operate normally. Conventionally, the temperature of the liquid lens part was measured indirectly around the liquid lens part, not the liquid lens part itself. This is because the temperature of the liquid lens unit is measured by a convection method, so an error may occur between the measured temperature and the temperature of the liquid lens unit itself.
  • the embodiment provides a camera module capable of accurately measuring the temperature of a liquid lens unit.
  • the camera module includes: a substrate on which an image sensor is disposed; A base disposed on the substrate; A holder disposed on the base; A liquid lens unit disposed on the holder; A temperature sensor disposed on the base; And a temperature conduction part disposed to contact the liquid lens part and the temperature sensor.
  • the temperature conduction unit includes a first region extending in a horizontal direction, a second region bent from the first region to make surface contact with the temperature sensor, and a third region bent to make surface contact with the liquid lens unit.
  • it may be a metal material.
  • the liquid lens unit may include a liquid lens including first and second electrodes; And a spacer disposed surrounding the liquid lens, and the temperature conduction part may cross the spacer and make surface contact with a side part of the liquid lens.
  • the spacer may include a receiving groove providing a space in which the third region and the side portion of the liquid lens contact each other.
  • the liquid lens unit may include a first connection unit disposed above the liquid lens and connected to the first electrode; And a second connector disposed under the liquid lens and connected to the second electrode.
  • the temperature conduction part and the first connection part or the second connection part may contact each other.
  • the substrate may include a first pad and a second pad
  • the base may include a first base connection part electrically connecting the first connection part and the second connection part to the first pad; And a second base connection part electrically connecting the temperature sensor to the second pad.
  • the camera module according to the embodiment attaches the metal plate to the liquid lens itself, not the periphery of the liquid lens, and receives the temperature of the liquid lens through a conduction method rather than a convection method, so that the temperature sensor is attached to the liquid lens itself. Even if not, it is possible to sense the temperature of the liquid lens more accurately than the convection method through temperature conduction by the metal plate,
  • FIG. 1 is a schematic side view of a camera module according to an embodiment.
  • FIG. 2 is an exploded perspective view of the camera module illustrated in FIG. 1 according to an embodiment.
  • FIG. 3 is a perspective view illustrating the camera module shown in FIG. 2 according to an embodiment.
  • FIG. 4 is an upper perspective view of the liquid lens unit shown in FIG. 2.
  • FIG. 5 is a bottom perspective view of the liquid lens unit shown in FIG. 2.
  • FIG. 6 is an exploded perspective view of the liquid lens unit shown in FIG. 2.
  • 7A and 7B are a top perspective view and a bottom perspective view of the spacer shown in FIG. 6, respectively.
  • FIGS. 4 to 6 are views for explaining the liquid lens shown in FIGS. 4 to 6.
  • FIGS. 9 is a plan view of the base and the main substrate shown in FIGS. 2 and 3.
  • FIG. 10 is a perspective view for helping understanding of the first base connection part of the base.
  • 11 is a perspective view for helping understanding of the first base connection part and the second base connection part.
  • FIG. 12 is a perspective view illustrating a camera module illustrated in FIG. 3 with a holder removed.
  • FIG. 13 is a local perspective view showing a connection relationship between a liquid lens, a first and second connection portion, a temperature conduction portion, a temperature circuit board, and a temperature sensor in the camera module shown in FIG. 3.
  • 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.
  • 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 The case of being'connected','coupled', or'connected' due to another element between the other elements may also be included.
  • top (top) or bottom (bottom) is one as well as when the two components are in direct contact It also includes a case in which the above other component is formed or disposed between the two components.
  • upper (upper) or lower (lower) 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.
  • 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 included in the camera module of the embodiment and the object of temperature measurement is a liquid lens, but the embodiment is not limited thereto. That is, even when the variable lens included in the camera module according to the embodiment and the object of temperature measurement is a lens other than a liquid lens, the following description may be applied.
  • a camera module 100 according to an embodiment will be described with reference to the accompanying drawings.
  • the camera module 100 is described using a Cartesian coordinate system (x-axis, y-axis, and z-axis), but it goes without saying that this can also be described by other coordinate systems.
  • 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.
  • the camera module 100 according to an embodiment will be described as follows.
  • FIG. 1 is a schematic side view of a camera module 100 according to an embodiment.
  • the camera module 100 may include a lens assembly 22, a control circuit 24, and an image sensor 26.
  • the lens assembly 22 may include a plurality of lens units and a holder accommodating the plurality of lens units.
  • the plurality of lens units may include a liquid lens unit, and may further include at least one of a first lens unit or a second lens unit.
  • the control circuit 24 serves to supply a driving voltage (or operating voltage) to a lens unit, particularly, a liquid lens unit accommodated in the lens assembly 22.
  • the image sensor 26 may be disposed under the lens assembly 22 to perform a function of converting light that has passed through the lens assembly 22 into image data.
  • control circuit 24 and the image sensor 26 may be disposed on a single printed circuit board (PCB), but this is only an example, and embodiments are not limited thereto.
  • PCB printed circuit board
  • the configuration of the control circuit 24 may be designed differently according to specifications required by the optical device.
  • the control circuit 24 since the control circuit 24 is implemented as a single chip, the intensity of the driving voltage applied to the lens assembly 22 can be reduced. Through this, the size of the optical device mounted on the portable device can be further reduced.
  • FIG. 2 is an exploded perspective view of the camera module 100 shown in FIG. 1 according to an embodiment
  • FIG. 3 is a combined perspective view of the camera module 100 shown in FIG. 2 according to an embodiment.
  • the camera module 100 may include a lens assembly, a main substrate 140 (or substrate), and an image sensor. Although the image sensor is not directly shown in FIG. 2, the image sensor may be embedded in the main substrate 140, or may be disposed on the main substrate 140 in a region 180 facing the lens assembly.
  • the camera module 100 may further include a cover, a sensor base disposed between the lens assembly and the image sensor, and a filter.
  • a cover disposed between the lens assembly and the image sensor
  • a filter disposed between the lens assembly and the image sensor
  • other components having the same role as the components 110, 120, 130, and 140 illustrated in FIGS. 2 and 3 may be included in the camera module 100.
  • the lens assembly may include a liquid lens unit 110 and a holder 120.
  • the lens assembly may further include at least one of a first lens unit or a second lens unit.
  • the lens assembly shown in FIGS. 2 and 3 may correspond to the lens assembly 22 shown in FIG. 1.
  • Such a lens assembly may be disposed on the main substrate 140.
  • the first lens unit is disposed above the lens assembly, and may be a region into which light is incident from the outside of the lens assembly. That is, the first lens unit may be disposed on the liquid lens unit 110 in the holder 120.
  • the first lens unit may be implemented as a single lens, or may be implemented as a plurality of lenses that are aligned with respect to a central axis to form an optical system.
  • the central axis may mean an optical axis (LX) of the optical system formed by the first lens unit, the liquid lens unit 110, and the second lens unit included in the camera module 100, and the optical axis ( It can also mean an axis parallel to LX). That is, the first lens unit, the liquid lens unit 110, the second lens unit, and the image sensor 180 may be aligned and disposed in the optical axis LX through active alignment (AA).
  • AA active alignment
  • the second lens unit may be disposed under the liquid lens unit 110 in the holder 120.
  • the second lens unit may be disposed to be spaced apart from the first lens unit in the optical axis direction (eg, z axis direction).
  • the second lens unit may be implemented as a single lens, or may be implemented as a plurality of lenses that are aligned with respect to a central axis to form an optical system.
  • each of the first lens unit and the second lens unit is a solid lens, and may be implemented with glass or plastic, but the embodiment is a specific material of each of the first lens unit and the second lens unit. It is not limited to the presence or absence of the first and second lens units.
  • the holder 120 may include first and second holes H1 and H2 and first and second sidewalls.
  • the first and second holes H1 and H2 are formed in the upper and lower portions of the holder 120, respectively, so that the upper and lower portions of the holder 120 may be opened, respectively.
  • the first hole H1 and the second hole H2 may be through holes.
  • the first lens unit may be accommodated, mounted, seated, contacted, fixed, temporarily fixed, supported, coupled, or disposed in the first hole H1 formed inside the holder 120, and the second lens unit may be It may be accommodated, mounted, seated, contacted, fixed, temporarily fixed, supported, coupled, or disposed in the second hole H2 formed in the inside of the device.
  • first and second sidewalls of the holder 120 are in a direction perpendicular to the optical axis (LX) direction (for example, the z-axis direction) (hereinafter referred to as'first direction' and, for example, the x-axis direction) They can be arranged facing each other.
  • the first sidewall may include a first opening OP1
  • the second sidewall may include a second opening OP2 having the same or similar shape as the first opening OP1. Accordingly, the first opening OP1 disposed on the first sidewall and the second opening OP2 disposed on the second sidewall may be disposed to face each other in the first direction.
  • the inner space of the holder 120 in which the liquid lens unit 110 is to be disposed may be opened by the first and second openings OP1 and OP2. At this time, the liquid lens unit 110 is inserted through the first or second openings OP1 and OP2 to be mounted, seated, contacted, fixed, temporarily fixed, supported, coupled, or disposed in the internal space of the holder 120. I can.
  • the liquid lens unit 110 can be inserted into the inner space of the holder 120 through the first or second openings OP1 and OP2, the first of the holder 120 based on the optical axis LX direction.
  • a size of each of the second openings OP1 and OP2 may be larger than a cross-sectional area of the liquid lens unit 110 in the y-axis and z-axis directions.
  • FIG. 4 is an upper perspective view of the liquid lens unit 110 shown in FIG. 2
  • FIG. 5 is a lower perspective view of the liquid lens unit 110 shown in FIG. 2
  • FIG. 6 is a liquid lens shown in FIG. It shows an exploded perspective view of the part 110.
  • the liquid lens unit 110 includes a liquid lens (or liquid lens body) 112, a spacer 114, a first connection part 116, and a second connection part 118. It may include.
  • the liquid lens unit 110 may be accommodated in the holder 120 together with the first and second lens units described above.
  • the first connection part 116 passes a plurality of first electrodes E1 included in the liquid lens 112 to a plurality of pads of the main substrate 140 via the base 130. Among 144), it may be electrically connected to the first pad (or electrode pad). To this end, the first connection part 116 may be disposed above the liquid lens 112 and the spacer 114. For example, as shown in FIG. 4, when the number of the plurality of first electrodes E1 is four, the number of first connecting portions 116 may also be four. As such, the number of first electrodes E1 may be the same as the number of first connection parts 116.
  • Each of the first connection parts 116 includes one end part 116a electrically connected to the first electrode E1 of the liquid lens 112 and some of the first base connection parts 132a and 132b of the base 130 to be described later. It may include the other end (116b) electrically connected.
  • the body between one end 116a and the other end 116b of the first connection part 116 is disposed on the upper surface of the spacer 114, and from the upper surface of the spacer 114 toward the main substrate 140 It can have a bent shape.
  • a part of the first connection part 116 may be coated or inserted on the surface of the spacer 114. That is, the first connector 116 may be implemented as a MID (Mold Insert Design).
  • the second connection part 118 passes the second electrode E2 included in the liquid lens 112 to the plurality of pads 144 of the main substrate 140 via the base 130. Among them, it can be electrically connected to the second pad. To this end, the second connection part 118 is connected to the second electrode E2 and may be disposed under the liquid lens 112 and the spacer 114.
  • the number of second connecting portions 118 may be the same as or different from the number of second electrodes E2. This is because, as will be described later, since the first electrode E1 is an individual electrode, it must be electrically separated from each other, whereas the second electrode E2 is a common electrode and may not need to be electrically separated from each other.
  • the second connection part 118 may include three second connection parts 118A, 118B, and 118C that are electrically spaced apart from each other as shown in FIG. 6, but the embodiment is not limited thereto. According to another embodiment, the three second connection portions 118A, 118B, and 118C may be implemented integrally.
  • the second connection part 118 may include a part 118a electrically connected to the second electrode E2 of the liquid lens 112 and a part of the first base connection part 132a of the base 130 to be described later. It may include the other part (118b) electrically connected.
  • first connecting portion 116 and the first electrode E1 may be electrically connected through a conductive epoxy using silver (Ag), and the second connecting portion 118 and the second electrode E2 ) May be electrically connected through a conductive epoxy using Ag, but embodiments are not limited thereto.
  • 7A and 7B are a top perspective view and a bottom perspective view of the spacer 114 shown in FIG. 6, respectively.
  • the spacer 114 may be disposed between the first connection part 116 and the second connection part 118, and may be disposed to protrude from at least one of the first or second openings OP1 and OP2 of the holder 120. have.
  • the spacer 114 is arranged to surround the liquid lens 112 in a ring shape, so that the liquid lens 112 may be protected from external impact.
  • the spacer 114 may have a shape in which the liquid lens 112 can be mounted, seated, contacted, fixed, temporarily fixed, supported, coupled, or disposed therein.
  • the spacer 114 may include a hollow 114H in which the liquid lens 112 is accommodated and a frame surrounding the hollow 114H formed in the center.
  • the spacer 114 may have a rectangular planar shape (hereinafter, referred to as a “ ⁇ ” shape) with a crooked center, but embodiments are not limited thereto.
  • a receiving groove H3 may be formed on the upper side of the spacer 114.
  • the receiving groove H3 provides a space in which the one end 116a of the first connection part 116 is connected to the first electrode E1 of the liquid lens 112.
  • accommodation grooves H4 forming a path through which the body passes between one end 116a and the other end 116b of the first connection part 116 may be further formed on the upper and side portions of the spacer 114.
  • the spacer 114 may be disposed to protrude from at least one of the first or second openings OP1 and OP2 of the holder 120. That is, at least a portion of the spacer 114 is the first or the first of the holder 120 in a direction perpendicular to the optical axis LX (eg, the x-axis direction) together with the first and second connecting portions 116 and 118. 2 It may have a shape protruding from at least one of the side walls. This is because the length of the spacer 114 in the x-axis direction is longer than the length of the holder 120 in the x-axis direction. In addition, when the spacer 114 is inserted into the holder 120 and during an active alignment process, the spacer 114 may contact the gripper.
  • FIGS. 4 to 6 are views for explaining the liquid lens 112 shown in FIGS. 4 to 6.
  • the liquid lens 112 includes a plurality of different types of liquids LQ1 and LQ2, first to third plates P1, P2 and P3, and first and second electrodes E1 and E2. And an insulating layer 119. Although not shown, the liquid lens 112 may further include an optical layer.
  • the plurality of liquids LQ1 and LQ2 are accommodated in the cavity CA, and may include a first liquid LQ1 having conductivity and a second liquid (or insulating liquid) LQ2 having a non-conductive property. .
  • the first liquid LQ1 and the second liquid LQ2 are not mixed with each other, and an interface BO may be formed in a contact portion between the first and second liquids LQ1 and LQ2.
  • the second liquid LQ2 may be disposed on the first liquid LQ1, but the embodiment is not limited thereto.
  • the second liquid LQ2 may be implemented with a non-conductive material such as oil, and the first liquid LQ1 may be implemented with a conductive material.
  • the inner surface of the first plate P1 may form a sidewall i of the cavity CA.
  • the first plate P1 may include upper and lower openings having a predetermined inclined surface. That is, the cavity CA may be defined as a region surrounded by an inclined surface of the first plate P1, a third opening in contact with the second plate P2, and a fourth opening in contact with the third plate P1.
  • the diameter of the wider opening may vary depending on an angle of view (FOV) required by the liquid lens 112 or the role that the liquid lens 112 plays in the camera module 100.
  • the interface BO formed by the two liquids may move along the slope of the cavity CA by the driving voltage.
  • the opening area in the direction in which light is incident from the cavity CA may be narrower than the opening area in the opposite direction.
  • the liquid lens 112 may be implemented so that the inclination direction of the cavity CA is opposite.
  • the entire or part of the arrangement of the components included in the liquid lens 112 is changed according to the inclination direction of the liquid lens 112.
  • only the inclination direction of the cavity CA may be changed, and the arrangement of the remaining components may not be changed.
  • the first liquid LQ1 and the second liquid LQ2 may be filled, accommodated, or disposed in the cavity CA of the first plate P1. Also, the cavity CA is a portion through which light passing through the first lens unit passes. Therefore, the first plate P1 may be made of a transparent material, or may contain impurities so that light transmission is not easy.
  • First and second electrodes E1 and E2 may be disposed on one surface and the other surface of the first plate P1, respectively.
  • the plurality of first electrodes E1 may be spaced apart from the second electrode E2 and may be disposed on one surface (eg, an upper surface, a side surface, and a lower surface) of the first plate P1.
  • the second electrode E2 is disposed on at least a portion of the other surface (eg, the lower surface) of the first plate P1 and may directly contact the first liquid LQ1.
  • the plurality of first electrodes E1 may correspond to individual electrodes that may be electrically separated from each other, and the plurality of second electrodes E2 may correspond to common electrodes that may not be electrically separated from each other. have.
  • the first electrode E1 is illustrated as having four individual electrodes, the embodiment is not limited thereto. According to another embodiment, the first electrode E1 may include fewer or more individual electrodes than four. A portion of the second electrode E2 disposed on the other surface of the first plate P1 may be exposed to the first liquid LQ1 having conductivity.
  • Each of the first and second electrodes E1 and E2 may be made of a conductive material.
  • the second plate P2 may be disposed on one surface of the first electrode E1. That is, the second plate P2 may be disposed on the first plate P1. Specifically, the second plate P2 may be disposed on the upper surface of the first electrode E1 and the cavity CA.
  • the third plate P3 may be disposed on one surface of the second electrode E2. That is, the third plate P3 may be disposed under the first plate P1. Specifically, the third plate P3 may be disposed under the lower surface of the second electrode E2 and 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.
  • 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.
  • the second plate P2 may have a configuration that allows light incident from the first lens unit to proceed into the cavity CA of the first plate P1.
  • the third plate P3 may have a configuration that allows light that has passed through the cavity CA of the first plate P1 to proceed to the second lens unit.
  • the third plate P3 may directly contact the first liquid LQ1.
  • the liquid lens 112 illustrated in FIG. 8 may further include a bonding member 115.
  • the bonding member (or adhesive) 115 is disposed between the first plate P1 and the third plate P3 and serves to couple the first plate P1 and the third plate P3 to each other.
  • the liquid lens 112 illustrated in FIG. 8 may further include a plate leg (LEG) 115 instead of including the bonding member 115.
  • the plate leg 115 is disposed between the first plate P1 and the third plate P3 and serves to support the third plate P3.
  • the plate leg 115 may be integrally implemented with the same material as the third plate P3.
  • the insulating layer 119 may be disposed in the upper region of the cavity CA while covering a part of the lower surface of the second plate P2. That is, the insulating layer 119 may be disposed between the second liquid LQ2 and the second plate P2. In addition, the insulating layer 119 may be disposed while covering a part of the first electrode E1 forming a sidewall of the cavity CA. In addition, the insulating layer 119 may be disposed on the lower surface of the first plate P1 to cover part of the second electrode E2 and the first plate P1 and the first electrode E1. Accordingly, contact between the first electrode E1 and the first liquid LQ1 and contact between the first electrode E1 and the second liquid LQ2 may be blocked by the insulating layer 119.
  • the insulating layer 119 covers one of the first and second electrodes E1 and E2 (for example, the first electrode E1) and the other electrode (for example, the second electrode E2). )) may be exposed to apply electric energy to the conductive first liquid LQ1.
  • the first connection part 116 and the second connection part 118 described above serve to supply voltage to the liquid lens 112.
  • the first electrode E1 may be electrically connected to the first connector 116
  • the plurality of second electrodes E2 may be electrically connected to the second connector 118.
  • the interface between the first liquid LQ1 and the second liquid LQ2 (BO) is deformed so that at least one of a shape such as a curvature or a focal length of the liquid lens 112 may be changed (or adjusted).
  • the focal length of the liquid lens 112 may be adjusted while at least one of the curvature or inclination of the interface BO formed in the liquid lens 112 is changed in response to the driving voltage.
  • the liquid lens 112 When the deformation of the interface BO, the radius of curvature, and the tilting angle are controlled, the liquid lens 112, the lens assembly including the liquid lens 112, the camera module 100, and the optical device are autofocusing (AF: Auto -Focusing) function, camera shake correction or image shake prevention (OIS: Optical Image Stabilizer) function can be performed.
  • AF Auto -Focusing
  • OIS Optical Image Stabilizer
  • the first connector 116 may transmit four different voltages to the liquid lens 112, and the second connector 118 may transmit one common voltage to the liquid lens 112.
  • the common voltage may include a DC voltage or an AC voltage.
  • the width or duty cycle of the pulse may be constant.
  • Individual voltages supplied through the first connector 116 may be applied to the plurality of first electrodes E1 exposed to each corner of the liquid lens 112.
  • FIGS. 9 is a plan view of the base 130 and the main substrate 140 shown in FIGS. 2 and 3.
  • the base 130 serves to accommodate the lens assembly. That is, as shown in FIG. 3, the base 130 may be disposed surrounding the lens assembly. To this end, the base 130 may include an accommodation hole 130H for accommodating the second hole H2 of the holder 120. As such, the holder 120 may be disposed on the base 130.
  • the inner diameter of the base 130 (that is, the diameter of the receiving hole 130H) may be greater than or equal to the outer diameter of the second hole H2.
  • the shape of the receiving hole 130H and the second hole H2 of the base 130 is shown to be circular, but the embodiment is not limited thereto and may be changed into various shapes.
  • the receiving hole 130H may be formed near the center of the base 130, at a position corresponding to the position of the image sensor 180 disposed on the camera module 100.
  • the base 130 may be mounted on the main substrate 140 by being spaced apart from a circuit element (not shown) disposed on the main substrate 140. That is, the holder 120 may be spaced apart from the circuit element and disposed on the main substrate 140.
  • FIG. 10 is a perspective view for helping understanding of the first base connecting portion 132a of the base 130
  • FIG. 11 is a perspective view for helping understanding of the first base connecting portion 132b and the second base connecting portion 134.
  • the base 130 may include first base connecting portions 132: 132a and 132b and a second base connecting portion 134.
  • the first base connection part 132 electrically connects the first connection part 116 and the second connection part 118 to the first pad, and the second base connection part 134 electrically connects the temperature sensor 170 and the second pad.
  • One of the both ends of the first base connection part 132a, 132b is connected to the other end 116b of the first connection part 116 as described above, and may be electrically connected to the other part 118b of the second connection part 118. have.
  • the other end of both ends of the first base connection portions 132a and 132b may be electrically connected to the first pad among the plurality of pads 144 of the main substrate 140.
  • the other ends of the first base connection portions 132a and 132b may be electrically connected to the first pad of the main substrate 140 through conductive epoxy.
  • the first electrode E1 of the liquid lens 112 may be electrically connected to the main substrate 140 through the first connection part 116 and the first base connection parts 132a and 132b.
  • the second electrode E2 of the liquid lens 112 may be electrically connected to the main substrate 140 through the second connection part 118 and the first base connection part 132a.
  • the first base connection portions 132a and 132b may have a form of a conductive surface electrode disposed, formed, or coated on the surface of the base 130.
  • the other end of both ends of the second base connection 134 is electrically connected to the second pad among the plurality of pads 144 of the main substrate 140.
  • the other end of the second base connection part 134 may be electrically connected to the second pad of the main substrate 140 through conductive epoxy.
  • the second base connection portion 134 may have a form of a conductive surface electrode disposed, formed, or coated on the surface of the base 130. One end of the both ends of the second base connection part 134 will be described in detail later when describing the temperature circuit board 160 to be described later.
  • the main substrate 140 is disposed under the base 130, and the image sensor 180 is mounted, seated, contacted, fixed, temporarily fixed, supported, coupled, or accommodated in grooves, circuit elements (not shown) , May include a connector (or FPCB) 142 and a connector 143.
  • a connector or FPCB
  • the circuit element may constitute a control module that controls the liquid lens unit 110 and the image sensor 180.
  • the main substrate 140 may be implemented as a Rigid Flexible Printed Circuit Board (RFPCB) including the FPCB 142.
  • the FPCB 142 may be bent as required by the space in which the camera module 100 is mounted.
  • the connection unit 142 may include a driving voltage providing unit (not shown) that provides a driving voltage required by the liquid lens 112.
  • the connector 143 may electrically connect the main board 140 to an external power source or other device (eg, an application processor) outside the camera module 100.
  • the image sensor 180 is disposed between the base 130 and the main substrate 140 to convert light that has passed through the first lens unit, the liquid lens unit 110 and the second lens unit of the lens assembly into image data.
  • the image sensor 180 may convert light into an analog signal through a pixel array including a plurality of pixels, and synthesize a digital signal corresponding to the analog signal to generate image data.
  • the camera module 100 may further include an adhesive part 50.
  • the adhesive part 50 serves to adhere and fix the base 130 to the main substrate 140, and the embodiment is not limited to a specific bonding method between the base 130 and the main substrate 140. That is, in some cases, the adhesive part 50 may be omitted.
  • the camera module 100 is disposed so as to surround the holder 120 and the liquid lens unit 110, and may further include a cover that protects these 110 and 120 from external impact.
  • the camera module 100 further includes a filter for filtering light corresponding to a specific wavelength range with respect to the light passing through the first lens unit, the liquid lens unit 110 and the second lens unit. can do.
  • FIG. 12 is a perspective view of the camera module 100 shown in FIG. 3 with the holder 120 removed.
  • the temperature sensor 170 may be implemented as a thermistor, and may be disposed on the base 130.
  • the temperature conduction part 150 may contact each other with the first connection part 116 or the second connection part 118.
  • the temperature conduction unit 150 and the second connection unit 118 may contact each other.
  • the camera module 100 may further include a temperature conduction unit 150, a temperature circuit board 160, and a temperature sensor 170.
  • the temperature conduction unit 150 may be disposed to contact the liquid lens unit 110 and the temperature sensor 170. In the case of FIGS. 10 and 11, the temperature conduction unit 150 is spaced apart without contacting the temperature sensor 170, and is shown to be in contact with the temperature circuit board 160. However, as will be described later, when the temperature sensor 170 is implemented in a chip form and disposed on the temperature circuit board 160, the temperature conduction unit 150 may be disposed to contact the temperature sensor 170.
  • the temperature conduction unit 150 may include a first region 156, a second region 154, and a third region 152.
  • the first area 156 is an area (or part) extending in the horizontal direction and may be an area between the second area 154 and the third area 152.
  • the second region 154 may be a region bent from the first region 156 to make surface contact with the temperature sensor 170.
  • the third area 152 may be a bent area to make surface contact with the liquid lens unit 110.
  • the third region 152 of the temperature conduction unit 150 may correspond to one end of the temperature conduction unit, and the second region 154 of the temperature conduction unit 150 may correspond to the other end of the temperature conduction unit 150.
  • the temperature conduction unit 150 serves to conduct the temperature of the liquid lens 112 to the temperature circuit board 160, it may be implemented with a material having high thermal conductivity, but it is not necessary to use an expensive material such as platinum.
  • the temperature conduction unit 150 may be made of a metal material.
  • the first region 156 of the temperature conduction unit 150 may be implemented in the form of a metal plate, but the embodiment is not limited thereto.
  • the third region 152 of the temperature conduction unit 150 has a shape bent in a'C' shape, and the second region of the temperature conduction unit 150 ( 154) may be implemented in a bent shape.
  • the third region 152 has a tension and absorbs an external shock, so that it is stable to the liquid lens 112 despite an external force. Can keep in touch.
  • the embodiment is not limited to a specific shape of the temperature conduction unit 150.
  • the spacer 114 may include a receiving groove H5.
  • the receiving groove H5 provides a space in which the third region 152 of the temperature conduction unit 150 is in surface contact with the side of the liquid lens 112.
  • the receiving groove H5 may be formed under the spacer 114, but the embodiment is not limited thereto.
  • the temperature conduction unit 150 may cross the spacer 114 and make surface contact with the side of the liquid lens 112.
  • the first region 156 of the temperature conduction unit 150 may cross the lower side of the spacer 114 and face the side of the liquid lens 112, but the embodiment Not limited.
  • the receiving groove H5 of the spacer 114 not only provides a space in which the third region 152 and the side portion of the liquid lens 112 are in surface contact, but also provides a space in which the first region 156 of the temperature conduction unit 150 ) May provide a traversing path towards the side surface of the liquid lens 112.
  • the first region 156 and the second connector 118 of the temperature conduction unit 150 may be in surface contact with each other.
  • the second connection part 118 contacts the second electrode E2 of the liquid lens 112 and provides a driving voltage to the liquid lens 112, so that it has thermal conductivity. Therefore, when the first region 156 contacts the second connection part 118, the first region 156 conducts heat generated from the lower surface as well as the side surface of the liquid lens 112 to the temperature circuit board 160. can do. Accordingly, it is possible to more accurately measure the temperature of the liquid lens 112.
  • the first region 156 contacts the second connection part 118 the first region 156 can be stably supported by the second connection part 118, and thus may be resistant to external impact.
  • the temperature circuit board 160 has one surface in contact with the second region 154 of the temperature conduction unit 150.
  • the temperature sensor 170 may be mounted on one surface of the temperature circuit board 160 in contact with it.
  • a thermistor is a device whose resistance value changes according to temperature. Therefore, as in the embodiment, when the temperature of the liquid lens 112 is conducted to the temperature circuit board 160 through the temperature conduction unit 150, the resistance value of the temperature sensor 170 (for example, the thermistor) may change. I can. At this time, since the temperature sensor 170 is disposed in contact with the temperature circuit board 160, the temperature circuit board 160 senses the resistance value of the temperature sensor 170 and transfers the sensed result to the main board 140 , The temperature of the liquid lens 112 may be sensed through the main substrate 140.
  • the temperature sensor 170 for example, the thermistor
  • the temperature sensor 170 may have a chip shape. If the temperature sensor 170 is implemented in the form of a chip and is disposed on the temperature circuit board 160, the size of the area in which the temperature sensor 170 is disposed may be reduced compared to the case where the temperature sensor 170 is not implemented in a chip form.
  • the NTEC (Negative Temperature Coefficiency) type temperature sensor 170 may be used, but embodiments are not limited thereto.
  • the other surface of the temperature circuit board 160 on the opposite side of the surface on which the temperature sensor 170 is disposed is electrically connected to one end of both ends of the second base connection part 134 of the base 130.
  • the other surface of the temperature circuit board 160 is disposed in contact with the second base connection part 134 in a back-to-back contact.
  • the other end of the second base connection part 134 is electrically connected to a second pad that is another one of the plurality of pads 144 of the main substrate 140.
  • the resistance value sensed by the temperature circuit board 160 may be provided to the main board 140 via the second base connection part 134 of the base 130.
  • the embodiment is not limited to a specific arrangement position of the temperature circuit board 160.
  • the temperature sensor 170 for example, the thermistor
  • the temperature sensor 170 for example, the thermistor
  • convection rather than a conduction method
  • the temperature of the liquid lens 112 is sensed by the method, an error is inevitably caused between the sensed temperature and the actual temperature of the liquid lens 112.
  • the thermistor is disposed on a connection substrate other than the liquid lens 112, when the connection substrate is bonded to the liquid lens 112 using silver (Ag), the manufacturing process of the camera module becomes difficult, and the defect rate is reduced. Can increase.
  • the temperature sensor 170 for measuring the temperature of the liquid lens is not disposed on the liquid lens 112 itself, but is disposed around the liquid lens 112. Even so, since the first region 156 is attached to the liquid lens 112 itself, and the temperature of the liquid lens 112 is transmitted through the conduction method rather than the convection method, the liquid lens 112 ) Temperature can be sensed more accurately.
  • the temperature sensor senses the temperature of the liquid lens 112 using a resistance temperature detector (RTD) method.
  • RTD resistance temperature detector
  • the manufacturing cost of the camera module can be increased.
  • the camera module 100 according to the embodiment uses the temperature sensor 170 of the NTEC method even though the temperature conduction unit 150 is implemented with a metal material that has heat conduction characteristics and is cheaper than platinum, so that an expensive metal such as platinum is used. Since it is not required, the manufacturing cost of the camera module 100 can be reduced.
  • an optical device may be implemented using the camera module 100 including the lens assembly 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, and the like, 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 100, a display unit (not shown) that outputs an image, a battery (not shown) that supplies power to the camera module 100, a camera module 100, 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.
  • the camera module according to the embodiment is 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 smartphone, a notebook computer, and a tablet computer. It can be used for the like.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Optics & Photonics (AREA)
  • Automatic Focus Adjustment (AREA)
  • Studio Devices (AREA)

Abstract

Un module de caméra selon un mode de réalisation de l'invention comprend : un substrat sur lequel est disposé un capteur d'image ; une base disposée sur le substrat ; un support disposé sur la base ; une partie lentille liquide disposée dans le support ; un capteur de température disposé dans la base ; et une partie de conduction de température disposée en contact avec la partie lentille liquide et le capteur de température.
PCT/KR2020/007135 2019-06-03 2020-06-02 Module de caméra WO2020246769A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2019-0065237 2019-06-03
KR1020190065237A KR20200138906A (ko) 2019-06-03 2019-06-03 카메라 모듈

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WO2020246769A1 true WO2020246769A1 (fr) 2020-12-10

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5718424B2 (fr) * 1974-03-20 1982-04-16
JP2007086163A (ja) * 2005-09-20 2007-04-05 Citizen Watch Co Ltd 液晶レンズおよび電子機器
JP2009200646A (ja) * 2008-02-19 2009-09-03 Olympus Imaging Corp 撮像装置
JP2010262246A (ja) * 2009-04-06 2010-11-18 Optoelectronics Co Ltd 液体レンズ光学体及び光学的情報読取装置
KR20180087082A (ko) * 2017-01-24 2018-08-01 엘지이노텍 주식회사 액체 렌즈 및 이를 포함하는 카메라 모듈 및 광학기기

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8922901B2 (en) 2013-05-24 2014-12-30 Invenios Inc Fabrication of liquid lens arrays
US9952358B2 (en) 2015-04-11 2018-04-24 Corning Incorporated Method to prevent emulsion in a liquid lens

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5718424B2 (fr) * 1974-03-20 1982-04-16
JP2007086163A (ja) * 2005-09-20 2007-04-05 Citizen Watch Co Ltd 液晶レンズおよび電子機器
JP2009200646A (ja) * 2008-02-19 2009-09-03 Olympus Imaging Corp 撮像装置
JP2010262246A (ja) * 2009-04-06 2010-11-18 Optoelectronics Co Ltd 液体レンズ光学体及び光学的情報読取装置
KR20180087082A (ko) * 2017-01-24 2018-08-01 엘지이노텍 주식회사 액체 렌즈 및 이를 포함하는 카메라 모듈 및 광학기기

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