WO2020242148A1 - Liquid lens, and camera module and optical device comprising same - Google Patents

Abstract

A liquid lens according to an embodiment comprises: a first plate including a cavity in which a conductive liquid and a non-conductive liquid are disposed; a first electrode disposed on the first plate; and a second electrode disposed on the first plate, wherein: the cavity includes a first cavity in which the conductive liquid and the non-conductive liquid are disposed and which has an inclined surface, and a second cavity in which the conductive liquid and the non-conductive liquid are disposed and which is arranged to surround the first cavity; and the second electrode is disposed on the first cavity.

Description

Liquid lens and camera module and optical device including the same

The embodiment relates to a liquid lens, a camera module including the same, and an optical device. More specifically, embodiments relate to a liquid lens capable of improving a response speed by minimizing a pressure difference occurring when a curvature of a liquid lens changes, and a camera module and an optical device including the same.

Users of portable devices have high resolution, small size, and various shooting functions (optical zoom function (zoom-in/zoom-out), Auto-Focusing (AF) function), image stabilization or image stabilization (Optical Image Stabilizer, OIS) functions, etc.). Such a photographing function may be implemented through a method of directly moving a lens by combining a plurality of lenses, but if the number of lenses is increased, the size of an optical device may increase. The autofocus and image stabilization functions are performed by moving or tilting several lens modules fixed to the lens holder and aligned with the optical axis, and a separate lens is driven to drive the lens module. The device is used. However, the lens driving device consumes high power, and in order to protect it, a cover glass must be added separately from the camera module, resulting in a thicker overall thickness.

Therefore, research on a liquid lens that performs autofocus and image stabilization functions by electrically controlling the curvature of the interface between two liquids is being conducted.

Embodiments are directed to providing a liquid lens capable of improving a response speed by minimizing a pressure difference occurring when a curvature change of a liquid lens is changed, and a camera module and an optical device including the same.

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

A liquid lens according to an embodiment includes: a first plate including a cavity in which a conductive liquid and a non-conductive liquid are disposed; A first electrode disposed on the first plate; And a second electrode disposed on the first plate, wherein the cavity includes: a first cavity in which the conductive liquid and the non-conductive liquid are disposed and having an inclined surface; And a second cavity in which the conductive liquid and the non-conductive liquid are disposed and disposed to surround the first cavity, and the second electrode is disposed on the first cavity.

In addition, a second plate disposed on the first electrode; A third plate disposed on the second electrode; And a communication part connecting the first cavity and the second cavity, wherein the first cavity corresponds to a lens area through which light is transmitted, and the second cavity is disposed outside the lens area.

In addition, the second cavity may include: a 2-1 part disposed in an upper area of the second cavity; And a 2-2 part disposed in the lower area of the second cavity.

In addition, the communication unit may include: a first communication unit formed between the first plate and the second plate and connecting the second-1 part to an upper region of the first cavity; And a second communication part formed on the first plate and the third plate, and connecting the second-2 part to a lower region of the first cavity.

In addition, the 2-1 part and the 2-2 part are arranged to be spaced apart from each other by a predetermined interval.

In addition, the 2-1 part is physically directly connected to the 2-2 part.

In addition, it includes at least one first hole formed while penetrating the first electrode and connecting the first communication part and the 2-1 part to each other.

In addition, it includes a plurality of second holes formed passing through the plurality of second electrodes and connecting the second communication part and the part 2-2 to each other.

In addition, it is disposed on the plurality of second electrodes, and includes an insulating layer blocking contact between the plurality of second electrodes and the first liquid or the second liquid, wherein the insulating layer includes the plurality of second electrodes It is also placed on the inner wall of the hall.

In addition, the part 2-2 includes a plurality of sub-parts disposed to overlap each of the plurality of second electrodes in a vertical direction and spaced apart from each other.

In addition, the first cavity, the 1-1 part; And a part 1-2 above the part 1-1, wherein the part 1-1 has a lower width and an upper width equal to each other, and the part 1-2 has a width from bottom to top. Increases.

On the other hand, the camera module according to the embodiment includes a holder including a solid lens; A liquid lens coupled to the holder; A first substrate connected to the liquid lens; A second substrate connected to the first substrate; And an image sensor disposed on the second substrate at a position corresponding to the liquid lens, wherein the liquid lens comprises: a first plate including a cavity in which first and second liquids are disposed; A first electrode disposed on the first surface of the first plate; A plurality of second electrodes disposed on the second surface of the first plate; A second plate disposed on the first electrode; And a third plate disposed on the plurality of second electrodes, wherein the cavity overlaps a first cavity disposed in a first region corresponding to a center of the image sensor and the first cavity in a horizontal direction A second cavity disposed in a second area other than the first area, wherein the second cavity includes: a 2-1 part disposed in an upper area of the second area; And a 2-2 part disposed in a lower area of the second area, wherein the second plate includes a first communication part connecting the 2-1 part and an upper area of the first cavity, The third plate includes a second communication part connecting the part 2-2 and a lower region of the first cavity.

According to the embodiment, a reservoir in which the first liquid and the second liquid are disposed is formed around a cavity formed in a region through which light passes. Accordingly, in the embodiment, the first liquid and the second liquid are disposed not only in the cavity but also in the reservoir. Accordingly, it is possible to increase the area of the area in which the first and second liquids are disposed, and to minimize a change in pressure difference occurring when the curvature of the interface is changed.

In addition, according to the embodiment, it is possible to secure the fluidity of the first and second liquids by securing an additional reservoir in which the first and second liquids are disposed, thereby improving the driving speed and response speed of the liquid lens. have. Accordingly, more efficient optical stabilization can be performed on an image or image obtained by converting an optical signal transmitted through the liquid lens.

1 illustrates an example of a camera device.

2 illustrates an example of a lens assembly included in a camera device.

3 illustrates a liquid lens whose focal length is adjusted in response to a driving voltage.

4 illustrates an embodiment of a liquid lens.

5 illustrates a change in the interface within the liquid lens.

6 is a diagram illustrating a cavity according to an exemplary embodiment.

7 is a top view of the first plate of FIG. 6 according to an embodiment.

8 is a top view of the first plate of FIG. 6 according to another embodiment.

9 is a bottom view of the first plate of FIG. 6 according to an exemplary embodiment.

10 is a bottom view of the first plate of FIG. 6 according to another embodiment.

11 is a bottom view of the first plate of FIG. 6 according to another embodiment.

12 is a cross-sectional view of another embodiment of a liquid lens.

13 is a cross-sectional view of another embodiment of a liquid lens.

14 is a diagram illustrating a pressure difference occurring when an interface changes in a liquid lens according to Comparative Examples and Examples.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. The embodiments may be modified in various ways and may have various forms, and specific embodiments will be illustrated in the drawings and described in detail in the text. However, this is not intended to limit the embodiments to a specific form of disclosure, and it should be understood that all changes, equivalents, and substitutes included in the spirit and scope of the embodiments are included.

Terms such as "first" and "second" may be used to describe various elements, but the elements should not be limited by the terms. The terms are used for the purpose of distinguishing one component from another component. In addition, terms specifically defined in consideration of the configuration and operation of the embodiment are only for describing the embodiment, and do not limit the scope of the embodiment.

In the description of the embodiment, in the case of being described as being formed on the "top (top)" or "bottom (on or under)" of each element, the top (top) or bottom (bottom) (on or under) ) Includes both elements in which two elements are in direct contact with each other or in which one or more other elements are indirectly formed between the two elements. In addition, when expressed as “up (up)” or “on or under”, the meaning of not only an upward direction but also a downward direction based on one element may be included.

In addition, relational terms such as "top/top/top" and "bottom/bottom/bottom" used below do not necessarily require or imply any physical or logical relationship or order between such entities or elements, It may be used to distinguish one entity or element from another entity or element.

1 illustrates an example of a camera device. As shown, the camera module may include a lens assembly 22 and an image sensor. At least one solid lens may be disposed above or below the lens assembly. The lens assembly 22 may include a liquid lens whose focal length is adjusted in response to an applied voltage. The camera module includes a lens assembly 22 including a first lens whose focal length is adjusted in response to a driving voltage applied between a common terminal and a plurality of individual terminals, and a control circuit for supplying a driving voltage to the first lens ( 24), and an image sensor 26 that is aligned with the lens assembly 22 and converts light transmitted through the lens assembly 22 into an electrical signal and is disposed under the lens assembly.

Referring to FIG. 1, the camera module may include circuits 24 and 26 formed on one printed circuit board (PCB) and a lens assembly 22 including a plurality of lenses, but this will be only an example. However, it does not limit the scope of the invention. The configuration of the control circuit 24 may be designed differently according to specifications required for the camera module. In particular, when the magnitude of the voltage applied to the liquid lens 28 is reduced, the control circuit 24 can be implemented as a single chip. Through this, the size of the camera module mounted on the portable device can be further reduced.

2, as shown, the lens assembly 22 includes a first lens unit 100, a second lens unit 200, a liquid lens unit 300, a lens holder 400, and a connection unit 500. It may include. The connection part 500 electrically connects the image sensor and the liquid lens, and may include a substrate, a wire, or a wire to be described later. The structure of the illustrated lens assembly 22 is only an example, and the structure of the lens assembly 22 may vary according to specifications required for the camera module. For example, in the illustrated example, the liquid lens unit 300 is located between the first lens unit 100 and the second lens unit 200, but in another example, the liquid lens unit 300 is the first lens unit ( It may be positioned above (front) than 100, and one of the first lens unit 100 or the second lens unit 200 may be omitted. The configuration of the control circuit 24 may be designed differently according to specifications required for the camera device. In particular, when the magnitude of the operating voltage applied to the lens assembly 22 is reduced, the control circuit 24 may be implemented as a single chip. Through this, the size of the camera device mounted on the portable device can be further reduced.

2 illustrates an example of the lens assembly 22 included in the camera device.

As shown, the lens assembly 22 may include a first lens unit 100, a second lens unit 200, a liquid lens unit 300, a lens holder 400, and a connection unit 500. The connection part 500 electrically connects the image sensor and the liquid lens, and may include a substrate, a wire, or a wire to be described later. The structure of the illustrated lens assembly 22 is only an example, and the structure of the lens assembly 22 may vary according to specifications required for the camera module. For example, in the illustrated example, the liquid lens unit 300 is located between the first lens unit 100 and the second lens unit 200, but in another example, the liquid lens unit 300 is the first lens unit ( It may be positioned above (front) than 100, and one of the first lens unit 100 or the second lens unit 200 may be omitted.

Referring to FIG. 2, the first lens unit 100 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 100 may be provided with at least one lens, or two or more lenses may be aligned with respect to the central axis PL to form an optical system.

The first lens unit 100 and the second lens unit 200 may be mounted on the lens holder 400. In this case, a through hole may be formed in the lens holder 400, and the first lens unit 100 and the second lens unit 200 may be disposed in the through hole. In addition, the liquid lens unit 300 may be inserted in a space between the first lens unit 100 and the second lens unit 200 in the lens holder 400.

Meanwhile, the first lens unit 100 may include a solid lens 110. The solid lens 110 may protrude outside the lens holder 400 and be exposed to the outside. When the solid lens is exposed, 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 may be deteriorated. In order to prevent or suppress surface damage of the solid lens 110, a method of disposing a cover glass, forming a coating layer, or configuring the solid lens 100 with a wear-resistant material for preventing surface damage may be applied.

The second lens unit 200 is disposed behind the first lens unit 100 and the liquid lens unit 300, and light incident from the outside to the first lens unit 100 passes through the liquid lens unit 300 Thus, it may enter the second lens unit 200. The second lens unit 200 may be spaced apart from the first lens unit 100 and may be disposed in a through hole formed in the lens holder 400.

Meanwhile, the second lens unit 200 may be provided as at least one lens, and when two or more lenses are included, the second lens unit 200 may be aligned with respect to the central axis PL to form an optical system.

The liquid lens unit 300 is disposed between the first lens unit 100 and the second lens unit 200, and may be inserted into the insertion hole 410 of the lens holder 400. The insertion hole 410 may be formed by opening a portion of the side surface of the lens holder. That is, the liquid lens may be inserted and disposed through the insertion hole 410 on the side of the holder. Like the first lens unit 100 and the second lens unit 200, the liquid lens unit 300 may also be aligned with respect to the central axis PL.

The liquid lens unit 300 may include a lens area 310. The lens area 310 is a portion through which light that has passed through the first lens unit 100 passes, and may contain a liquid at least in part. For example, the lens region 310 may contain two types, that is, a conductive liquid and a non-conductive liquid, and the conductive liquid and the non-conductive liquid may form an interface without being mixed with each other. The interface between the conductive liquid and the non-conductive liquid is deformed by the driving voltage applied through the connection part 500, so that the curvature of the interface of the liquid lens 28 or the focal length of the liquid lens may be changed. When such boundary surface deformation or curvature change is controlled, the liquid lens unit 300 and a camera module including the same may perform an autofocusing function, a camera shake correction function, and the like.

3 illustrates a liquid lens whose focal length is adjusted in response to a driving voltage. Specifically, (a) describes the first lens 28 included in the lens assembly 22 (refer to FIG. 2), and (b) describes the equivalent circuit of the lens 28.

First, referring to (a), the lens 28 whose focal length is adjusted in response to the driving voltage has the same angular distance and voltage through individual terminals (L1, L2, L3, L4) arranged in four different directions. Can be licensed. Individual terminals may be arranged with the same angular distance based on the central axis of the liquid lens, and may include four individual terminals. The four individual terminals can be arranged at each of the four corners of the liquid lens. When a voltage is applied through individual terminals (L1, L2, L3, L4), the applied voltage is placed in the lens region 310 by a driving voltage formed by interaction with a voltage applied to a common terminal (C0) to be described later. The interface between the conductive liquid and the non-conductive liquid may be deformed.

Further, referring to (b), the lens 28 receives an operating voltage from different individual terminals L1, L2, L3, L4 on one side, and a plurality of capacitors connected to the common terminal C0 on the other side ( 30). Here, the plurality of capacitors 30 included in the equivalent circuit may have a small capacitance of about tens to 200 picofarads (pF) or less. The above-described terminal of the liquid lens of the liquid lens may be referred to as an electrode sector or a sub electrode in this specification.

4 illustrates an embodiment of a liquid lens. Specifically, (a) of FIG. 4 is a top view of an embodiment of a liquid lens, and (b) of FIG. 4 is a cross-sectional view of an embodiment of a liquid lens.

Referring to FIG. 4, the liquid lens 28 may include two different liquids 122 and 124, a first plate 114, and an electrode. The two liquids 122 and 124 included in the liquid lens may include a conductive liquid and a non-conductive liquid. The first plate 114 may include a cavity 150 in which a conductive liquid and a non-conductive liquid are disposed. The sidewall surface of the cavity 150 may include an inclined surface.

In this case, the cavity 150 may be divided into a plurality of parts. Preferably, the cavity 150 includes a first cavity 151 (see FIG. 6) disposed in an area aligned with the image sensor to pass light, and a first cavity 150 disposed in an area spaced apart from the first cavity 151 by a predetermined distance. It may include two cavities (153, 155, see FIG. 6). In this case, the first and second cavities 151 and 153 and 155 may be interconnected through communication units 152 and 154 (refer to FIG. 6 ). In other words, the first cavity 151 and the second cavity 153 and 155 are not physically directly connected to each other. That is, the first cavity 151 and the second cavity 153 and 155 may be disposed to be spaced apart from each other by a predetermined interval. In addition, the first cavity 151 and the second cavity 153 and 155 may be connected to each other by the communication units 152 and 154.

At this time, the two different liquids 122 and 124 may be disposed in the first cavity 151, the second cavity 153 and 155 and the communication parts 152 and 154 constituting the cavity 150.

In this case, a part of the two liquids 122 and 124 may be disposed in the first cavity 151 to control the transmission path of light through a change in the curvature of the interface.

In addition, the second cavity (153, 155) minimizes the pressure difference generated when the curvature of the interface between the two liquids (122, 124) disposed in the first cavity (151) is changed, thereby improving the driving speed of the liquid lens. A portion of the two liquids 122 and 124 serving as may be disposed. In addition, the communication parts 152 and 154 connect the first cavity 151 and the second cavity 153 and 155 to each other, so that a portion of the two liquids 122 and 124 disposed in the first cavity 151 , It may serve to secure the fluidity of some of the two liquids 122 and 124 disposed in the second cavity 153 and 155.

The specific structure and shape of the cavity 150 will be described in more detail below.

Meanwhile, the electrode may be disposed on the first plate 114, and may be disposed above the first plate 114 or below the first plate 114. The liquid lens 28 may further include a second plate 112 that may be disposed above (lower) the electrode. In addition, the liquid lens may further include a third plate 116 that may be disposed under (upper) the electrode. As shown, an embodiment of the liquid lens 28 may include an interface formed by two different liquids 122 and 124. In addition, it may include at least one substrate 142 and 144 supplying voltage to the liquid lens 28. Here, the substrates 142 and 144 may mean a common electrode connection substrate 142 and an individual electrode connection substrate 144, respectively. The edge or corner portion of the liquid lens 28 may be thinner than the central portion of the liquid lens 28. A part of the corner of the second plate or the third plate may be escaped to expose a part of the electrode disposed on the first plate.

The liquid lens 28 includes two different liquids, for example, a conductive liquid 124 and a non-conductive liquid 122, and the curvature and shape of the interface formed by the two liquids are driven to be supplied to the liquid lens 28 Can be adjusted by voltage. The driving voltage supplied to the liquid lens 28 may be transmitted through the first substrate 144 and the second substrate 142. The first substrate 144 may transmit four distinct driving voltages, and the second substrate 142 may transmit one common voltage. The common voltage may include a DC voltage or an AC voltage. When the common voltage is applied in the form of a pulse, the pulse width or duty cycle may be constant. The voltage supplied through the second substrate 142 and the first substrate 144 may be applied to the plurality of electrodes 132 and 134 exposed at each corner of the liquid lens 28. A conductive epoxy may be disposed between the electrode and the substrate, and the electrode and the substrate may be bonded and energized through the conductive epoxy.

In addition, the liquid lens 28 includes a first plate 114 including a cavity 150 in an opening region having a predetermined inclined surface between the third plate 116 and the second plate 112 made of a transparent material. Is placed.

The second plate 112 may have a rectangular shape having a first width D1. The second plate 112 abuts and adheres to the first plate 114 in a bonding area around the top edge, and the first plate 114 has an inclined surface and has a diameter of a wide opening area 48 (D3 It may include a diameter D2 of the peripheral area 46 greater than ). The peripheral area 46 may be an area overlapping the upper surface of the first plate 114 and the liquid in the vertical direction or in a direction parallel to the optical axis.

A portion of the first electrode 132 disposed on the first plate 114 may be exposed so that a portion of the electrode pattern formed on the first plate 114 may be exposed to the conductive liquid. According to an embodiment, the second plate 112 may have a diameter D2 larger than the diameter D3 of the wide opening area of the first plate 114.

In this case, the opening area may function as a communication part 152 connecting the first cavity 151 and the second cavity 153 and 155 to each other.

Likewise, the third plate 116 may have a rectangular shape having the same first width D1 as the second plate 112. In this case, although it is illustrated as having the same width as the second plate 112 and the third plate 116, the present invention is not limited thereto.

The third plate 116 abuts and adheres to the first plate 114 in a bonding area around a lower surface edge, and the first plate 114 has an inclined surface and a narrow opening area (lower part of the first part) It may include a diameter (D2) of the surrounding area greater than the diameter of. That is, the second plate 114 and the third plate 116 may have the same shape, and may be bonded to the upper and lower portions of the first plate 112, respectively. Preferably, the second plate 114 and the third plate 116 may have a symmetrical shape with respect to the first plate 112, but are not limited thereto. In this case, the peripheral area of the third plate 116 may also be an area overlapping the upper surface of the first plate 114 and the liquid in the vertical direction or in a direction parallel to the optical axis. According to an embodiment, the third plate 116 may have a diameter D2 larger than the diameter D3 of the wide opening area of the first plate 114.

In this case, the opening area of the third plate 116 may function as a communication part 154 connecting the first and second cavities 153 and 155 to each other.

That is, the first communication part 152 of the second plate 112 is an upper portion of the first cavity 151 of the cavity 150 (preferably, a region in which the conductive liquid is disposed) and a portion 153 of the second cavity Can be connected to each other.

In addition, the second communication portion 154 of the third plate 116 is a lower portion of the first cavity 151 of the cavity 150 (preferably, a region in which the non-conductive liquid is disposed) and a portion 155 of the second cavity. ) Can be connected to each other.

Specific structures and shapes of the first cavity 151, second cavities 153 and 155 and communication parts 152 and 154 constituting the cavity 150 will be described in more detail below.

In addition, as described above, the liquid lens 28 may include a cavity 150 determined by an opening area of the third plate 116, the second plate 112, and the first plate 114. Here, the cavity 150 may be filled with two liquids 122 and 124 having different properties (eg, a conductive liquid and a non-conductive liquid), and an interface is formed between the two liquids 122 and 124 having different properties. Can be.

In addition, at least one of the two liquids 122 and 124 included in the liquid lens 28 has conductivity, and the liquid lens 28 has two electrodes 142 and 144 disposed above and below the first plate 114 And an insulating layer 118 disposed on an inclined surface through which a liquid having conductivity may contact. The insulating layer 118 may be disposed between the inner inclined surface of the first plate 114 and the liquids 122 and 124. Here, the insulating layer 118 covers one of the two electrodes 132 and 134 (eg, the second electrode 134) and exposes a portion of the other electrode (eg, the first electrode 132). So that electrical energy is applied to the conductive liquid (eg, 124). Here, the first electrode 132 may include at least one electrode sector, and the second electrode 134 may include two or more electrode sectors. For example, the second electrode 134 may include a plurality of electrode sectors sequentially disposed in a clockwise direction around an optical axis.

One or two or more substrates 142 and 144 for transmitting a driving voltage to the two electrodes 132 and 134 included in the liquid lens 28 may be connected. The focal length of the liquid lens 28 may be adjusted while the curvature and inclination of the interface 84 formed in the liquid lens 28 are changed in response to the driving voltage.

Meanwhile, the first plate 114 includes a first cavity 151 of the cavity 150, and the first cavity 151 has a wide opening area and a narrow opening area by an inner inclined surface of the first plate 114. Can include. In this case, the diameter D3 of the wide opening area of the first cavity 151 may vary according to the FOV required for the liquid lens or the role of the liquid lens in the camera device. The opening area may be a hole having a circular cross section. The interface formed by the two liquids can move along the inclined surface of the opening area by the driving voltage.

Meanwhile, the two liquids 122 and 124 include a first liquid 122 and a second liquid 124. In addition, as described above, the first liquid 122 may be a conductive liquid. In addition, the second liquid 124 may be a non-conductive liquid.

That is, the plurality of first and second liquids 122 and 124 are accommodated in the cavity, and include a first liquid 122 having conductivity and a second liquid (or insulating liquid) 124 having conductivity. I can. The first liquid 122 and the second liquid 124 are not mixed with each other, and an interface may be formed in a contact portion between the first and second liquids 122 and 124. For example, the second liquid 124 may be disposed under the first liquid 122, but the embodiment is not limited thereto. For example, the first liquid 122 may be disposed under the second liquid 124 differently from that shown.

One or more substrates 142 and 144 for transmitting voltage to the two electrodes 132 and 134 included in the liquid lens 28 may be connected. The focal length of the liquid lens 28 may be adjusted while the curvature, curvature or inclination of the interface 130 formed in the liquid lens 28 is changed in response to the driving voltage.

5 illustrates a change in the interface within the liquid lens. Specifically, (a) to (c) describe the movement of the interfaces 30a, 30b, 30c that may occur when a voltage is applied to the individual electrodes L1, L2, L3, and L4 of the liquid lens 28. .

First, referring to (a), when substantially the same voltage is applied to the individual electrodes L1, L2, L3, and L4 of the liquid lens 28, the interface 30a may maintain a shape close to a circular shape. When viewed from the top, the horizontal distance LH of the interface and the vertical distance LV of the interface are substantially the same, and the movement (eg, inclination angle) of the interface 30a may have a balance. In this case, the capacitance values of the interface 30a measured through four different individual electrodes L1, L2, L3, and L4 may be measured substantially the same.

Also, referring to (b), the voltage applied to the first individual electrode L1 and the third individual electrode L3 of the liquid lens 28 is applied to the second individual electrode L2 and the fourth individual electrode L4. A case that is higher than the applied voltage will be described. In this case, since the force to pull or push the interface 30b is different horizontally or vertically, the horizontal distance (LH) of the interface when viewed from the top surface) may be shorter than the vertical distance (LV) of the interface when viewed from the top surface. . When the voltage applied to the second individual electrode L2 and the fourth individual electrode L4 is lower than that of the first individual electrode L1 and the third individual electrode L3, the second individual electrode L2 and the fourth The inclination angle of the interface 30b of the liquid lens 28 at the individual electrode L4 is greater than the inclination angle of the interface 30b of the liquid lens 28 at the first and third individual electrodes L1 and L3. Because it is small, it looks the same on the plane, but in three dimensions, the vertical distance (LV) is longer than the horizontal distance (LH). In this case, the capacitance values of the interface 30a measured through the four different individual electrodes L1, L2, L3, and L4 may be different from each other. Meanwhile, since the interface 30b has a symmetrical change in the interface 30b, the capacitance value of the interface 30a measured through four different individual electrodes L1, L2, L3, and L4 may be symmetric. In this case, the capacitance values of L1 and L3 may be the same, and the capacitance values of L2 and L4 may be the same.

Further, referring to (c), the voltage applied to the first and third individual electrodes L1 and L3 of the liquid lens 28, and the second and fourth individual electrodes L2 and L4. Since the voltage applied to the interface varies, the vertical distance (LV) of the interface of the interface may be shorter than the horizontal distance (LH) when viewed from the top. As in the case of (b), the capacitance of the interface 30c measured through four different individual electrodes L1, L2, L3, and L4 of the interface 30c may be different. Meanwhile, since the interface 30c and the interface 30b are symmetrically changed, the capacitance value of the interface 30a measured through the four different individual electrodes L1, L2, L3, and L4 may be symmetric. In this case, the capacitance values of L1 and L3 may be the same, and the capacitance values of L2 and L4 may be the same.

In addition, there is a difference in capacitance measured at the interfaces 30a, 30b, and 30c shown in (a), (b) and (c), and the first individual electrode (L1) to the fourth individual electrode through the difference in capacitance According to the voltage applied to the electrode L4, it is possible to more directly and accurately measure how the interfaces 30a, 30b, and 30c moved differently from before.

Meanwhile, in the above-described example, a structure in which the liquid lens 28 includes four individual electrodes has been described, but the liquid lens 28 has more individual electrodes such as 8, 12, 16, etc. When the feedback electrode is included, the movement of the liquid lens 28 can be more precisely controlled, and the corresponding movement can be measured more accurately.

6 is a diagram illustrating a cavity according to an exemplary embodiment.

Referring to FIG. 6, the first plate 114 may include a cavity 150 in which the first liquid 152 and the second liquid 154 are disposed. In this case, the cavity 150 may include a first cavity 151 disposed on the lens area 310 and second cavities 153 and 155 disposed in an area other than the lens area 310.

At this time, the second cavities 153 and 155 include a 2-1 part 153 disposed above the first plate 114 at a position spaced apart from the first cavity 151 by a predetermined interval in the horizontal direction, A 2-2 part 155 disposed under the first plate 114 at a position spaced apart from the first cavity 151 by a predetermined interval in the horizontal direction may be included. In this case, the 2-1 part 153 may be spaced apart from the 2-2 part 155. Preferably, the 2-1 part 153 and the 2-2 part 155 are not physically directly connected. However, the 2-1 part 153 and the 2-2 part 155 may be connected to each other through the communication parts 152 and 154 and the first cavity 151. That is, the 2-1 part 153 may constitute an upper area of the second cavity, and the 2-2 part 155 may constitute a lower area of the second cavity. The 2-1 part 153 may be disposed surrounding the upper area of the first cavity, and the 2-2 part 155 may be disposed surrounding the lower area of the second cavity. Meanwhile, the first part 153 may be disposed surrounding the lower area of the second cavity. A first liquid and a second liquid that are not mixed with each other are disposed in the first cavity 151. In addition, the first liquid 122 may be disposed on the second liquid 124.

Accordingly, the first liquid 122 is included in the upper region of the first cavity 151 (upper side with respect to the interface), the first communication part 152 connected to the upper region, and the 2-1 part 153 Can be placed.

In addition, a second liquid 124 is contained in the lower region of the first cavity 151 (lower side with respect to the interface), the second communication part 154 connected to the lower region, and the second part 155 Can be placed.

According to an embodiment, in addition to the first cavity 151 in which liquids that change the transmission path of light passing through the lens area are disposed, the 2-1 part 153 and the second part 153 connected through the communication parts 152 and 154 A second part 155 is additionally formed, and liquids are disposed in the additionally formed second cavity.

Further, the fluidity of the first liquid and the second liquid in the first cavity 151 may be secured by the liquids disposed in the additionally formed cavity, and thus, the reaction speed of the liquid lens may be improved.

That is, in the liquid lens of the comparative example, the cavity includes only the first part and/or the communication part, and is disposed in a state in which two different types of liquids are completely confined in the first cavity and the communication part. At this time, when a movement for changing the interface between two different liquids occurs, there is a problem that the flow is not free because the movement must be made only in the space confined as described above.

For example, when a convex curvature is to be implemented in a state in which the curvature of the interface has a horizontal straight line, a movement of the interface of the first liquid moving downward occurs. In such a situation, a strong positive (+) pressure that tries to go down is applied to the lower part based on the first liquid, and a strong negative (-) pressure is required because the upper part has to fill it as much as the lower part goes down. This comes into play. That is, when it is necessary to change the curvature of the interface as described above, strong positive and negative pressures are applied to the lower and upper portions based on the first liquid, thereby reducing the moving speed of the liquid. In addition, when the moving speed of the liquid decreases, the response speed of the liquid lens is slowed, and accordingly, there is a problem (a problem of slowing the response speed) in which a considerable amount of time is required to create an interface curvature with a target curvature.

In contrast, in the embodiment, in the above situation, the first liquid filled in the 2-1 part 153 fills the upper part of the first cavity 151, and accordingly, the upper part of the first liquid is lowered. It is possible to reduce the pressure difference occurring in the part.

Meanwhile, as described above, the second plate 112 abuts and adheres to the first plate 114 in a bonding area around the top edge, and the first plate 114 has an inclined surface and has a wide opening area. The diameter D2 of the peripheral area 46 may be larger than the diameter D3 of 48. Here, the opening area corresponding to the peripheral area 46 is the lower surface 112A of the second plate 112 in FIG. 6, which is a second plate 112 bonded to the first plate 114. In this state, it functions as a first communication unit 152 connecting the first cavity 151 and the 2-1 part 153 to each other.

That is, the second plate 112 may have a first opening region 112A recessed inward on a lower surface thereof, and one end of the first opening region 112A is connected to the first cavity 151 and the other end May be connected to the 2-1 part 153.

Similarly, the third plate 116 abuts and adheres to the first plate 114 in a bonding area around the lower surface edge, and the first plate 114 has an inclined surface and a narrow opening area (the first part It may include a diameter (D2) of the peripheral area larger than the diameter of the lower portion).

Here, the opening area of the third plate 116 is the lower surface 116A of the third plate 116 in FIG. 6, which is a state in which the third plate 116 is bonded onto the first plate 114 The second communication unit 154 connecting the lower portion of the first cavity 151 and the 2-2 part 155 to each other may function.

That is, the third plate 116 may have a second opening region 116A recessed inward on the upper surface, and one end of the second opening region 116A is connected to the first cavity 151 and the other end May be connected to the 2-2 part 155.

In other words, the first communication part 152 of the second plate 112 has a lower portion of the first cavity 151 of the cavity 150 (preferably, a region in which the first liquid is disposed) and a part 2-1 ( 153) can be connected to each other.

In addition, the second communication part 154 of the third plate 116 includes a lower portion of the first cavity 151 of the cavity 150 (preferably, an area in which the second liquid is disposed) and the second part 155 ) Can be connected to each other.

7 is a top view of the first plate of FIG. 6 according to an embodiment, and FIG. 8 is a top view of the first plate of FIG. 6 according to another embodiment.

6 and 7, a first cavity 151 of a cavity 150 may be formed in the first plate 114.

In addition, a 2-1 part 153 may be formed at a position spaced apart from the first cavity 151 by a predetermined distance. In this case, the 2-1 part 153 may be divided into an upper region having a first width and a lower region having a second width. That is, the 2-1 part 153 may have a bottleneck shape. This is because the common electrode is disposed on the first plate 114, and the larger the width of the upper area of the 2-1 part 153 is, the smaller the area in which the common electrode is disposed. Accordingly, the upper area of the 2-1 part 153 may include a hole H connecting the lower area of the 2-1 part 153 and the first communication part 152.

In this case, the hole H may be disposed surrounding the first cavity 151 at a position spaced apart from the first cavity 151 by a predetermined distance. That is, the hole H may have a closed loop shape and may be disposed at a position spaced apart from the first cavity 151 by a predetermined distance. In addition, the depth of the hole H1 may be smaller than the depth of the first cavity 151.

Meanwhile, in the drawing, the hole H1 has a circular shape and is shown to be disposed surrounding the first cavity 151, but this is only an example, and the shape of the hole may be variously modified. will be. For example, the hole H may have various closed loop shapes such as a square, a triangle, an oval, and a polygon.

Meanwhile, the lower region of the 2-1 part 153 may be connected to the hole H, and accordingly, may be connected to the first communication part 152 through the hole H.

In addition, the hole H may be selectively formed in a region of the upper surface of the first plate 114 in which the common electrode is not disposed. For example, the hole H may be formed to partition a region between a common electrode and an individual electrode on the upper surface of the first plate 114.

In addition, differently, the hole H may be disposed so as to overlap a region of the upper surface of the first plate 114 on which the common electrode is disposed in a vertical direction. In this case, the hole H1 may be formed on the first plate 114 while penetrating the common electrode.

In addition, the lower region of the 2-1 part 153 may have a larger plan area than the upper region corresponding to the hole H. The 2-1 part 153 may be disposed to overlap with the hole H1 in a vertical direction. That is, the inner wall 153A of the lower region of the 2-1 part 153 may be located closer to the outer wall of the first cavity 151 than the hole H, and the outer wall 153B is the hole. It may be located farther away from the outer wall of the first cavity 151 than (H).

Meanwhile, referring to FIG. 8, a plurality of holes H1, H2, H3, and H4 disposed around the first cavity 151 and spaced apart from each other at a predetermined interval may be included. For example, the plurality of holes may be four as shown in the drawing.

Each of the plurality of holes H1, H2, H3, and H4 may be disposed to face the first cavity 151 and may have a shape corresponding to the facing portion. For example, each of the plurality of holes H1, H2, H3, and H4 may have a horseshoe shape protruding in a direction opposite to a direction toward the center of the first cavity 151, but is not limited thereto.

Meanwhile, the 2-1 part 153 may have a trapezoidal shape whose width gradually increases from top to bottom.

9 is a bottom view of the first plate of FIG. 6 according to an embodiment, FIG. 10 is a bottom view of the first plate of FIG. 6 according to another embodiment, and FIG. 11 is a further embodiment. This is a bottom view of the first plate of FIG. 6.

6 and 10, a first cavity 151 of a cavity 150 may be formed in the first plate 114.

In addition, a 2-2 part 155 may be formed at a position spaced apart from the first cavity 151 by a predetermined distance. In this case, the 2-2 part 155 may be divided into a lower area having a first width and an upper area having a second width. That is, the 2-2 part 155 may have a bottleneck shape opposite to the 2-1 part 153.

This is because a plurality of individual electrodes are disposed on the lower surface of the first plate 114. As the width of the lower area of the 2-2 part 155 increases, the area in which the common electrode is disposed decreases. Accordingly, the lower region of the 2-2 part 155 includes holes H5, H6, H7, and H8 connecting the lower region of the 2-2 part 155 and the second communication part 154. Can include.

The holes H5, H6, H7, and H8 may be formed while passing through a plurality of individual electrodes disposed on the lower surface of the first plate 114. That is, the plurality of individual electrodes have a plate-shaped electrode structure. Accordingly, the holes H5, H6, H7, and H8 may be formed through the plate-shaped individual electrodes.

At this time, the individual electrode should not be in contact with the second liquid. In this case, when an insulating layer is not formed around the holes H5, H6, H7, H8, the second liquid disposed in the hole and the individual electrodes may contact each other. Accordingly, an insulating layer 118 may be disposed around the holes H5, H6, H7, and H8.

Meanwhile, in the drawings, the holes H5, H6, H7, and H8 are shown to have a circular shape, but are not limited thereto. In addition, although the drawing shows that one hole is formed on one individual electrode through which it is formed, this is only an example, and a plurality of holes through the same may be formed on one individual electrode.

That is, the 2-2 part 155 is disposed to surround the first cavity 151 at a location spaced apart from the second communication part 154 and the first cavity 151. In addition, the holes H5, H6, H7, H8 may be formed by opening a part of the individual electrode and the first plate 114, and based on this, the 2-2 part 155 and the second The communication parts 154 may be interconnected.

Accordingly, the plan area of the 2-2 part 155 may be larger than the plan area of the holes H5, H6, H7, and H8. The 2-2 part 155 may be disposed to overlap with the holes H5, H6, H7, and H8 in a vertical direction. That is, the inner wall 153A of the part 2-2 may be positioned closer to the outer wall of the first cavity 151 than the holes H5, H6, H7, H8, and the outer wall 153B May be located farther away from the outer wall of the first cavity 151 than the holes H5, H6, H7, and H8.

Meanwhile, referring to FIG. 10, a 2-2 part 155 may include a plurality of holes H9, H10, H11, and H12 disposed around the first cavity 151 and spaced apart from each other by a predetermined interval. I can. For example, the plurality of holes may be four as shown in the drawing.

Each of the holes H9, H10, H11, and H12 may be disposed to face the first cavity 151 and may have a shape corresponding to the facing portion. For example, each of the plurality of holes H9, H10, H11, and H12 may have a horseshoe shape protruding in a direction opposite to a direction toward the center of the first cavity 151, but is not limited thereto.

Referring to FIG. 11, the 2-2 part 155 may be divided into a plurality of sub-parts. That is, in FIGS. 9 and 10, the 2-2 part 155 surrounds the first cavity 151 and is integrally connected to each other.

On the other hand, the 2-2 part 155 in FIG. 11 is disposed on the first individual electrode L1 and connected to the fifth hole H5 penetrating the first individual electrode L1 ( 1551) may be included. In addition, the 2-2 part 155 includes a second sub-part 1552 disposed on the second individual electrode L2 and connected to a sixth hole H6 penetrating the second individual electrode L2. can do. The 2-2 part 155 may include a third sub-part 1553 disposed on the third individual electrode L3 and connected to the seventh hole H7 penetrating the third individual electrode L3. have. The 2-2 part 155 may include a fourth sub-part 1554 disposed on the fourth individual electrode L4 and connected to the eighth hole H8 penetrating the fourth individual electrode L4. have. In addition, the first to fourth sub-parts 1551, 1552, 1553, and 1554 may be arranged to be spaced apart from each other by a predetermined interval. That is, the first to fourth sub-parts 1551, 1552, 1553, and 1554 are not directly connected to each other, but may be connected to the second communication unit 154 through the holes H5, H6, H7, H8. have.

12 is a cross-sectional view of another embodiment of a liquid lens.

The liquid lens shown in FIG. 12 is substantially the same as the liquid lens shown in FIG. 6 except for the shapes of the 2-1 part 153 and the 2-2 part 155, so the same reference numerals are used and overlapping Omit the explanation.

In FIG. 6, the 2-1 part 153 and the 2-2 part 155 are not directly connected to each other, but are connected to the first cavity 151 through the first communication part and the second communication part.

Alternatively, according to FIG. 12, the liquid lens 28A includes a 2-1 part 151 and a 2-2 part 155, and at this time, the 2-1 part 151 and the 2-2 The parts 155 may be directly connected to each other. Accordingly, as the 2-1 part 151 and the 2-2 part 155 are connected to each other, one second cavity may be formed.

In this case, a first liquid 122 and a second liquid 124 may be disposed in the one second cavity, respectively. And, like the first liquid 122 and the second liquid 124 disposed in the first cavity 151, the first liquid 122 and the second liquid 124 are located above the second cavity. It is divided into a region and a lower region to form an interface.

13 is a cross-sectional view of another embodiment of a liquid lens.

Since the liquid lens shown in FIG. 13 is substantially the same as the liquid lens shown in FIG. 6 except for the shape of the first cavity 151, the same reference numerals are used, and redundant descriptions are omitted.

In FIG. 6, the sidewall of the first cavity 151 is formed as a whole to have one inclined surface. That is, the first cavity 151 has a shape whose width gradually decreases from top to bottom.

Alternatively, according to FIG. 13, the liquid lens 28B includes a first cavity 151, and the first cavity 151 is a 1-1 part 151A and a 1-2 part based on an inflection point. It can be classified as (151B).

The 1-1 part 151A is a lower area of the first cavity 151, and the 1-2 part 151B is an area of the first cavity 151 disposed above the 1-1 part 151A. It may be an upper area.

The first-first part 151A may have a lower width and an upper width equal to each other. That is, the 1-1th part 151A may have a rectangular or square shape in a vertical cross section. Preferably, the sidewall of the 1-1 part 151A may be perpendicular to the lower surface of the first plate 114. An interior angle between the sidewall of the first-first part 151A and the lower surface of the first plate 114 may be 90 degrees.

The first-2 part 151B may have a lower width and an upper width different from each other. That is, the first-2 part 151B may have a parallelogram in a vertical cross-sectional shape. The first-2 part 151B may gradually decrease in width from top to bottom. The sidewall of the 1-2 part 151B may have an inclined surface. An inner angle between the sidewall of the 1-2 part 151B and the lower surface of the first plate 114 may be less than 90 degrees.

That is, the inner angle between the sidewall of the first-first part 151A and the lower surface of the first plate 114 is between the sidewall of the first-second part 151B and the lower surface of the first plate 114 May be larger than the cabinet.

The part 151A and the 1-2th part 151B may be divided based on the inflection point. The inflection point may be determined based on an interface between the first liquid 122 and the second liquid 124. Preferably, the inflection point may be determined based on the lowest point at which the interface between the first liquid 122 and the second liquid 124 can be located. That is, in the liquid lens, the focal length of the liquid lens 28 may be adjusted while the curvature, curvature, or inclination of the interface 130 is changed. At this time, in order to speed up the reaction rate of the interface, it is preferable that the sidewall has an inclined surface. Accordingly, in an embodiment, an inclined surface is formed up to the lowest point where the interface can be located, and the lower portion of the lowest point has a vertical surface rather than an inclined surface, so that the amount of liquid that can be filled in the interior is increased. In addition, as the amount of the liquid increases, a pressure difference in a situation in which the interface changes may be minimized, and a response speed may be improved based on this.

14 is a diagram illustrating a pressure difference occurring when an interface changes in a liquid lens according to Comparative Examples and Examples.

FIG. 14A shows the pressure difference when the interface of the liquid lens changes according to the comparative example, and FIG. 14B shows the cavity 150 including the second cavities 152 and 154 according to the embodiment. It shows the pressure difference when the interface changes in the structure.

In the comparative example, it was confirmed that a pressure difference of about 350Pa occurred when the interface of the liquid lens was changed.

On the other hand, in the case of the interface change in the structure of the cavity 150 including the second cavities 152 and 154 according to the embodiment, it was confirmed that a pressure difference of about 90Pa occurs, and the pressure difference decreases compared to the comparative example. I could confirm. According to the structure according to this embodiment, the reaction speed of the liquid lens can be improved by at least 10% or more compared to the comparative example.

According to the embodiment, a reservoir in which the first liquid and the second liquid are disposed is formed around a cavity formed in a region through which light passes. Accordingly, in the embodiment, the first liquid and the second liquid are disposed not only in the cavity but also in the reservoir. Accordingly, it is possible to increase the area of the area in which the first and second liquids are disposed, and to minimize a change in pressure difference occurring when the curvature of the interface is changed.

In addition, according to the embodiment, it is possible to secure the fluidity of the first and second liquids by securing an additional reservoir in which the first and second liquids are disposed, thereby improving the driving speed and response speed of the liquid lens. have. Accordingly, more efficient optical stabilization can be performed on an image or image obtained by converting an optical signal transmitted through the liquid lens.

As described above with respect to the embodiment, only a few are described, but other various types of implementation are possible. The technical contents of the above-described embodiments may be combined in various forms unless they are technologies incompatible with each other, and may be implemented as a new embodiment through this.

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

In addition, the optical device may be implemented as a portable device such as a smart phone, a notebook computer, or a tablet computer. Such an optical device may include a display unit (not shown) that outputs a camera module image, a battery (not shown) that supplies power to the camera module, and a camera module, a display unit, and a main body housing on which the battery is mounted. 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.

It is obvious to those skilled in the art that the present invention can be embodied in other specific forms without departing from the spirit and essential features of the present invention. Therefore, the detailed description above should not be construed as restrictive in all respects and should be considered as illustrative. The scope of the present invention should be determined by rational interpretation of the appended claims, and all changes within the equivalent scope of the present invention are included in the scope of the present invention.

Claims (12)

1. A first plate including a cavity in which a conductive liquid and a non-conductive liquid are disposed;

   A first electrode disposed on the first plate; And

   Including; a second electrode disposed on the first plate,

   The cavity includes a first cavity in which the conductive liquid and the non-conductive liquid are disposed and has an inclined surface; And

   And a second cavity in which the conductive liquid and the non-conductive liquid are disposed and disposed to surround the first cavity,

   The second electrode is a liquid lens disposed on the first cavity.
2. The method of claim 1,

   A second plate disposed on the first electrode;

   A third plate disposed on the second electrode; And

   And a communication part connecting the first cavity and the second cavity,

   The first cavity corresponds to a lens area through which light is transmitted,

   The second cavity is disposed outside the lens area

   Liquid lens.
3. The method of claim 2,

   The second cavity,

   A 2-1 part disposed in the upper area of the second cavity; And

   Including a 2-2 part disposed in the lower area of the second cavity

   Liquid lens.
4. The method of claim 3,

   The communication part,

   A first communication part formed between the first plate and the second plate and connecting the part 2-1 and an upper region of the first cavity; And

   And a second communication part formed on the first plate and the third plate and connecting the part 2-2 and the lower region of the first cavity

   Liquid lens.
5. The method of claim 3,

   The 2-1 part and the 2-2 part

   Spaced apart from each other

   Liquid lens.
6. The method of claim 3,

   Part 2-1 above,

   Physically directly connected to part 2-2 above

   Liquid lens.
7. The method of claim 4,

   It is formed while penetrating the first electrode and including at least one first hole connecting the first communication part and the 2-1 part to each other.

   Liquid lens.
8. The method of claim 4,

   And a plurality of second holes formed passing through the plurality of second electrodes and connecting the second communication part and the 2-2 part to each other

   Liquid lens.
9. The method of claim 8,

   An insulating layer disposed on the plurality of second electrodes and blocking contact between the plurality of second electrodes and the first liquid or the second liquid,

   The insulating layer,

   Also disposed on the inner wall of the plurality of second holes

   Liquid lens.
10. The method of claim 7,

    Part 2-2 above,

    And a plurality of sub-parts disposed to overlap each of the plurality of second electrodes in a vertical direction and spaced apart from each other

    Liquid lens.
11. The method of claim 1,

    The first cavity,

    Part 1-1; And

    Including the 1-2 part above the 1-1 part,

    Part 1-1 above,

    The lower width and upper width are equal to each other,

    Part 1-2 above,

    The width increases from bottom to top

    Liquid lens.
12. A holder including a solid lens;

    A liquid lens coupled to the holder;

    A first substrate connected to the liquid lens;

    A second substrate connected to the first substrate; And

    And an image sensor disposed on the second substrate at a position corresponding to the liquid lens,

    The liquid lens,

    A first plate including a cavity in which first and second liquids are disposed;

    A first electrode disposed on the first surface of the first plate;

    A plurality of second electrodes disposed on the second surface of the first plate;

    A second plate disposed on the first electrode; And

    Comprising a third plate disposed on the plurality of second electrodes,

    The cavity,

    A first cavity disposed in a first area corresponding to the center of the image sensor,

    And a second cavity disposed in a second area other than the first area overlapping the first cavity in a horizontal direction,

    The second cavity,

    A 2-1 part disposed in an upper area of the second area; And

    It includes a 2-2 part disposed in the lower area of the second area,

    The second plate,

    A first communication part connecting the part 2-1 and an upper region of the first cavity,

    The third plate,

    Including a second communication part connecting the part 2-2 and the lower region of the first cavity

    Camera module.

Images