KR102349228B1 - Camera module - Google Patents

Abstract

An embodiment includes a holder having a through hole in the optical axis direction; a liquid lens disposed on the holder; a solid lens unit disposed under the liquid lens; an aperture disposed between the liquid lens and the solid lens unit; a sensor substrate electrically connected to the liquid lens; and an image sensor disposed on the optical axis direction of the liquid lens and mounted on the sensor substrate, wherein the liquid lens includes a conductive liquid and a non-conductive liquid, and the cavity has a first opening in an object-side direction and an image sensor in an image-side direction. and a second opening, wherein the size of the first opening is larger than the size of the second opening.

Description

Camera Module {CAMERA MODULE}

The embodiment relates to a camera module and an optical device including the same, and more particularly, to a camera module including a liquid lens and an optical device including the same.

A user of a portable device wants an optical device having a high resolution, small size, and various shooting functions, for example, an auto-focusing (AF) function, or an optical image stabilizer (OIS) function. are doing 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 the optical device may increase.

Autofocus and image stabilization are performed by moving or tilting multiple lens modules fixed to the lens holder and aligned with the optical axis in the vertical direction of the optical axis or optical axis, and driving a separate lens to drive the lens module device is used. However, the lens driving device consumes high power, and requires driving members such as magnets and coils to drive the lens module, and requires free space for driving the lens module in response to the driving range of the lens module. is thicker.

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.

Japanese Patent Laid-Open No. 2013-24938 (published date: February 4, 2013)

An embodiment is to provide a camera module and an optical device capable of performing AF or OIS using a liquid lens.

An embodiment includes a holder having a through hole in the optical axis direction; a liquid lens disposed on the holder; a solid lens unit disposed under the liquid lens; an aperture disposed between the liquid lens and the solid lens unit; a sensor substrate electrically connected to the liquid lens; and an image sensor disposed on the optical axis direction of the liquid lens and mounted on the sensor substrate, wherein the liquid lens includes a conductive liquid and a non-conductive liquid, and the cavity has a first opening in an object-side direction and an image sensor in an image-side direction. and a second opening, wherein the size of the first opening is larger than the size of the second opening.

D3/2=D2/2+T2×Tan(FOV/2), D3 is the size of the first opening, D2 is the size of the second opening, T2 is the thickness of the liquid lens, and FOV is the angle of view of the optical system can be

D2/2=D1/2+T1×Tan(FOV/2), D2 is the size of the second opening, D1 is the diameter of the diaphragm, and T1 is the distance from the rear surface of the liquid lens to the solid lens part , and the FOV may be an angle of view of the optical system.

D3/2=D1/2+(T1+T2)×Tan(FOV/2), D3 is the size of the first opening, D1 is the diameter of the diaphragm, T1 is the solid lens from the back of the liquid lens A distance to negative, T2 may be the thickness of the liquid lens, and FOV may be an angle of view of the optical system.

The solid lens unit may include first to fifth lenses disposed in the direction of the sensor substrate from the direction of the liquid lens.

0.75<f1/F<1.1, f1 may be an effective focal length of the first lens, and F may be an effective focal length of the optical system.

the first lens has a positive refractive power, the second lens has a negative refractive power, the third lens has a positive refractive power, the fourth lens has a positive refractive power, and the fifth lens has a positive refractive power. The lens may have negative refractive power.

1.3<TTL/F<1.6, TTL is a distance from the first surface in the object-side direction of the first lens to an image, and F may be an effective focal length of the optical system.

20<v3d<30, and v3d may be an Abbe's number in the d-line of the third lens.

The diameter of the first opening may be greater than 2.36 millimeters and less than 5.1 millimeters.

A diameter of the second opening may be greater than 2.3 millimeters and less than 5.1 millimeters.

The diameter of the aperture may be greater than 1.1 millimeters and less than 2.5 millimeters.

The angle of view of the optical system may be 70 degrees to 90 degrees.

The thickness of the liquid lens may be between 0.6 millimeters and 0.8 millimeters.

The distance from the rear surface of the liquid lens to the solid lens unit may be greater than 0.3 millimeters and less than 0.5 millimeters.

The liquid lens includes: a first plate having a cavity for accommodating a conductive first liquid and a non-conductive second liquid; a first electrode disposed on the first plate; a second electrode disposed under the first plate; a second plate disposed on the first electrode; and a third plate disposed under the second electrode.

Another embodiment is a holder having a through hole in the optical axis direction; a liquid lens disposed on the holder; a solid lens unit disposed under the liquid lens; an aperture disposed between the liquid lens and the solid lens unit; a sensor substrate electrically connected to the liquid lens; and an image sensor disposed on the optical axis direction of the liquid lens and mounted on the sensor substrate, wherein the liquid lens includes a conductive liquid and a non-conductive liquid, and the cavity has a first opening in an object-side direction and an upper side a camera module including a second opening in the direction, wherein the size of the first opening is larger than the size of the second opening; a filter that selectively transmits light that has passed through the camera module according to a wavelength; and

It provides an optical device including an image sensor that converts an image incident through the camera module into an electrical signal.

In the camera module including the liquid lens and the display device including the same according to the embodiment, the distance from the front surface of the liquid lens to the rear surface of the sixth lens is fixed, and the focal length and diopter of the liquid lens inside can be varied, , AF may be possible without moving the lenses in the lens assembly.

1 and 2 are a perspective view and a side view of an embodiment of a camera module,
3 is a view showing a liquid lens of the camera module,
Figure 4 is a view showing the arrangement of the lens assembly in the camera module of Figure 1,
5 is a view showing the relationship between the thickness and distance of the lens assembly in the camera module of FIG. 4;
6 is a view showing the relationship between the focal length of the camera module and the distance to the object according to the embodiment;
7 is a diagram illustrating a relationship between a focal length and a diopter of a liquid lens in a camera module according to an embodiment.

An embodiment of the present invention that can specifically realize the above object will be described with reference to the accompanying drawings.

In the description of the embodiment according to the present invention, in the case where it is described as being formed on "on or under" of each element, on (above) or below (on) or under) includes both elements in which two elements are in direct contact with each other or one or more other elements are disposed between the two elements indirectly. In addition, when expressed as "up (up) or down (on or under)", the meaning of not only the upward direction but also the downward direction with respect to one element may be included.

1 is a perspective view of an embodiment of a camera module, and FIG. 2 is a side view of an embodiment of the camera module.

The camera module is configured to supply a driving voltage to a liquid lens and a lens assembly 1000 including a plurality of lenses including a liquid lens part whose focal length is adjusted in response to a driving voltage applied between a common terminal and a plurality of individual terminals. A control circuit 2000 may be included.

The configuration of the control circuit 2000 may be designed differently according to specifications required for the imaging device. In particular, in order to reduce the level of the operating voltage applied to the lens assembly 1000 , the control circuit 2000 may be implemented as a single chip. Accordingly, the size of the camera device mounted on the portable device can be further reduced.

In the lens assembly 1000 , a base 700 and a holder (not shown) are disposed on a sensor substrate 800 , and a liquid lens 300 and a solid lens unit (not shown) are disposed inside the holder. The liquid lens 300 may be exposed through an opening formed in the front surface of the holder.

The cover 600 may be disposed to surround the upper surface and the side surface of the structure in which the above-described base 700, the holder, the liquid lens 300, and the solid lens unit are combined. An opening may be provided on the front surface of the cover 600 , and the opening on the front surface of the cover 600 may be disposed to face the opening on the front surface of the holder.

The illustrated structure of the lens assembly 1000 is only an example, and the structure of the lens assembly 1000 may vary according to specifications required for a camera device.

The liquid lens 300 may be disposed in front of the lens assembly 1000 , and may be a region into which light is incident from the outside of the lens assembly 1000 .

An exposure lens (not shown) may be provided in front of the liquid lens 300 , and a cover glass may be disposed in front of the exposure lens. The exposure lens may protrude to the outside of the cover and be exposed to the outside, thereby damaging the surface.

If the surface of the lens is damaged, the image quality of the image captured by the camera module may be deteriorated. Accordingly, in order to prevent or suppress surface damage of the exposure lens, a method of disposing a cover glass or forming a coating layer or configuring the exposure lens with a wear-resistant material to prevent surface damage may be applied.

A through hole may be provided in the holder in a direction parallel to the optical axis of the liquid lens 300 , and the liquid lens 300 and the solid lens unit may be disposed in the through hole.

The solid lens unit may include a plurality of plastic or glass lenses. The liquid lens 300 and a plurality of lenses constituting the solid lens unit may be aligned with respect to a central axis to form an optical system. Here, the central axis may be the same as the optical axis of the optical system.

The cover and structures provided inside the cover may be disposed on the base 700 . The base 700 may be provided integrally with the holder, or may be omitted.

A sensor substrate 800 including a light receiving element (not shown) may be disposed under the solid lens unit, and the light receiving element may be, for example, an image sensor. A horizontal and/or vertical length of a unit pixel of the image sensor may be, for example, 2 um (micrometer) or less.

As shown, an open region from which a partial region of one side of the cover 600 is removed is formed, and the first and second connection substrates 380 and 390 respectively connected to the first electrode and the second electrode of the liquid lens are formed above. It can be exposed and extended to the outside in the open area of

The first and second connection boards 380 and 390 may be, for example, a flexible circuit board (FPCB), and the terminals 356 of the first and second connection boards 380 and 390 are connected to the plurality of sensor boards 800 . It may be electrically connected to the terminal 810 .

When the first and second connection boards 380 and 390 are provided together on one side of the lens assembly 1000 from which the cover 600 is removed, regions in contact with the terminals 810 of the circuit board 800 are They may be disposed adjacent to each other.

The liquid lens and the camera module including the same according to the embodiment can reduce the size of the camera module by changing the surface tension of the first and second liquids with electricity, and mechanically move the lens by performing AF or OIS with electricity less power consumption.

FIG. 3 is a view showing a liquid lens of the camera module of FIG. 1 .

The liquid lens 300 may include a liquid, a first plate, and an electrode. The liquid may include a non-conductive first liquid 340 and a conductive second liquid 350 . The first plate 310 may include a cavity in which a liquid is disposed.

An electrode may be disposed above or below the first plate 310 . For example, the first electrode 345 may be disposed below the first plate 310 , and the second electrode 355 may be disposed above the first plate. A second plate or a third plate may be disposed above or below the first plate. For example, a third plate may be disposed under the first electrode, a second plate may be disposed above the second electrode, and at least one of the second plate or the third plate may be omitted.

The first plate 310 is disposed between the second plate 320 and the third plate 330, and has a preset inclined surface (for example, an inclined surface having an angle of about 55 to 65 degrees or 50 to 70 degrees). The branch may include upper and lower openings. A region surrounded by the above-described inclined surface and the first opening in contact with the second plate 320 and the second opening in contact with the third plate 330 may be referred to as a 'cavity'.

In an embodiment, the _{size O 2} of the second opening may be smaller _{than the size O 1 of the first opening.} Here, the size of the openings may mean a cross-sectional area in a horizontal direction, or a radius if the cross-section of the opening is circular, and a diagonal length if a square.

The first plate 310 is a structure for accommodating the first and second liquids 340 and 350 . The second plate 320 and the third plate 330 include a region through which light passes, and thus may be made of a light-transmitting material, for example, glass, and for convenience of the process, the second plate 320 . and the third plate 330 may be formed of the same material.

In addition, the first plate 310 may be made of a transparent material, or may contain impurities to prevent light from being easily transmitted.

The second plate 320 is configured to be incident when the light incident from the first lens unit 100 travels into the cavity, and the third plate 330 is configured such that the light passing through the cavity is transmitted to the second lens unit. It is a configuration that passes when proceeding to (400).

The above-described cavity may be filled with the first liquid 340 and the second liquid 350 having different properties, and an interface may be formed between the first liquid 340 and the second liquid 350 . The interface between the first liquid 340 and the second liquid 350 may have a curved, inclination, or the like change.

The first liquid 340 may be oil, for example, a phenyl-based silicone oil.

The second liquid 350 may be formed by mixing, for example, ethylene glycol and sodium bromide (NaBr).

At least one of a sterilizing agent and an antioxidant may be included in the first liquid 340 and the second liquid 350 , respectively. The disinfectant may be a phenyl-based antioxidant or a phosphorus (P)-based antioxidant. And, the disinfectant may be any one of alcohol-based, aldate-based, and phenol-based disinfectant.

The first electrode 345 may be disposed on a partial region of the lower surface of the first plate 310 and may be in direct contact with the first liquid 340 . The second electrode 355 may be disposed to be spaced apart from the first electrode 345 , and may be disposed on the upper surface, the side surface, and the lower surface of the first plate 310 .

The inner surface of the first plate 310 may form a sidewall i of the cavity. An insulating layer 360 may be disposed between the first liquid 340 or the second liquid 350 and the first electrode 345 . A portion of the second liquid 350 and a portion of the second electrode 355 may contact each other. The first electrode 345 and the second electrode 355 may apply an electrical signal received from an external circuit board to control the interface between the first liquid 340 and the second liquid 350 .

The first electrode 345 and the second electrode 355 may be made of a conductive material, for example, may be made of a metal, and specifically may include chromium (Cr). Chromium or Chrom is a hard transition metal with a silvery luster, which is brittle, does not discolor easily, and has a high melting point.

And, since the alloy containing chromium is strong and hard against corrosion, it can be used in the form of an alloy with other metals. In particular, since chromium (Cr) has little corrosion and discoloration, it has strong characteristics in the conductive liquid filling the cavity.

The insulating layer 360 may be disposed in the upper region of the cavity to cover a portion of the upper surface of the third plate 330 and a portion of the first electrode 345 forming the sidewall of the cavity. Also, the insulating layer 360 may be disposed on the upper surface of the first plate 310 to cover a portion of the second electrode 355 and the first plate 310 and the first electrode 345 . The insulating layer 360 may be implemented with, for example, a parylene C (parylene C) coating material, and may further include a white dye. The white dye may increase the frequency at which light is reflected from the insulating layer 360 forming the sidewall i of the cavity.

As illustrated, an insulating layer 360 may be disposed between the first liquid 340 and the third plate 330 . The second liquid 350 may be in direct contact with the second plate 320 .

The edges of the second plate 320 and the third plate 330 may have a rectangular shape, but are not limited thereto.

The second electrode 355 may be exposed in at least one area outside the second plate 320 , and the first electrode 345 may be exposed in at least one area at the edge of the third plate 330 . .

In addition, the second connection substrate 390 is disposed on the second electrode 355 in the area outside the second plate 320 , and the first connection board 390 is disposed on the first electrode 345 in the area outside the third plate 300 . A substrate 380 may be disposed.

Although not shown, a conductive epoxy may be disposed between the second electrode 355 and the second connection substrate 390 , and a conductive epoxy may also be disposed between the first electrode 345 and the first connection substrate 380 . can be In addition, the second connecting substrate 390 and the first connecting substrate 380 may be provided integrally with the second electrode 355 and the first electrode 345 , respectively.

4 is a view illustrating an arrangement of a lens assembly in the camera module of FIG. 1 . Hereinafter, the arrangement of the lens assembly in the camera module will be described with reference to FIG. 3 .

The solid lens unit may include first to fifth lens units 110 , 120 , 410 , 420 , 430 , and a stop is disposed between the liquid lens 300 and the first lens unit 110 . can be

Hereinafter, the 'object side' refers to the surface of the lens in the direction of the object or the subject with respect to the optical axis, and the 'image side' refers to the direction of the sensor in which the image is formed based on the optical axis. of the lens surface.

Also, in the present invention, "+ power" of a lens indicates a converging lens that converges parallel light, and "-power" of a lens indicates a diverging lens that diverges parallel light.

The lens assembly includes first to fifth lenses 110 , 120 , 410 , 420 , 430 disposed from the object side to the image side, and includes a filter 450 , a cover glass (not shown) and a light receiving element 480 . may be further included.

In the filter 450, a flat optical member such as an infrared cut filter is disposed, the cover glass may be an optical member, for example, a cover glass for protecting an imaging surface, and the light receiving element 480 is a printed circuit. It may be an image sensor stacked on a substrate (not shown).

The light receiving element 480 may be an image sensor, and a horizontal and/or vertical length of a unit pixel of the image sensor may be 2um (micrometer) or less. The above-described embodiment and the embodiments described below may provide an imaging lens that can be applied to a camera module with a high pixel and/or pixel number, and the above-described camera module includes an image sensor or a light receiving element with a high pixel and/or pixel number. In this case, the horizontal and/or vertical length of the unit pixel may be 2 μm or less.

'S02' is an object side surface of the liquid lens 300, 'S01' is an image side surface of the liquid lens 300, 'S11' is an object side surface of the first lens 110, and 'S12' is the first lens 110 ), 'S21' is the object side of the second lens 120, 'S22' is the image side of the second lens 120, 'S41' is the object side of the third lens 410, ' S42' is the image side of the third lens 410, 'S51' is the object side of the fourth lens 420, 'S52' is the image side of the fourth lens 420, and 'S61' is the fifth lens The object side of 430 , 'S62', may be the image side of the fifth lens 430 .

Although not shown, a spacer may be disposed between each of the solid lenses. At least one of the spacers may serve as an diaphragm. In addition, a holder may be disposed at the edge of the first to fifth lenses 110 to 430, and the holder may accommodate both the liquid lens and the solid lens unit.

The first lens 110 has positive refractive power, the second lens 120 has negative refractive power, the third lens 410 has positive refractive power, and the fourth lens 420 has positive refractive power. and the fifth lens 430 may have negative refractive power.

The lens assembly may satisfy Equation 1 below.

<Equation 1>

0.75<f1/F<1.1

Here, f1 may be an effective focal length of the first lens 110, and F may be an effective focal length of the optical system, that is, the liquid lens and the entire first to fifth lenses. The focal length refers to the distance from the lens to the point where the image is formed after the collimated light is incident on the optical system such as the lens from the object side.

The lens assembly may satisfy Equation 2 below.

<Equation 2>

1.3<TTL/F<1.6,

Here, TTL may be the distance from the first surface S11 of the first lens 110 in the object-side direction to the image.

The lens assembly may satisfy Equation 3 below.

<Equation 3>

20<v3d<30

Here, v3d may be an Abbe number in the d-line (587.6 nm) of the third lens 410 . The Abbe number at the d-line can be expressed as (nd-1)/(nF-nC), where nF is the refractive index of the medium at 486.1 nanometers, nC is the refractive index of the medium at 656.3 nanometers, and nd is 587.6 The refractive index of the medium in nanometers, where the medium refers to the material of the third lens 410 .

Table 1 shows the characteristics of each lens constituting the lens assembly 1000 .

TTL 4.6 F 3.16 f1 2.53 f2 -4.87 f3 17.46 f4 3.27 f5 -2.17

f1 to f5 may be focal lengths of the first to fifth lenses 110 to 430 . The first to fifth lenses 110 to 430 may be made of plastic.

5 is a view illustrating a relationship between a thickness and a distance of a lens assembly in the camera module of FIG. 4 .

In FIG. 5 , the angle of view of the lens assembly is referred to as FOV, the size of the first opening of the liquid lens 300 is referred to as D3, the size of the second opening is referred to as D2, the size of the stop is referred to as D1, and the size of the liquid lens is referred to as D1. When the thickness of 300 is T2 and the distance between the liquid lens 300 and the first lens 110 is T1, D3 and D2 may satisfy Equation 4 below.

<Equation 4>

D3/2=D2/2+T2×Tan(FOV/2)

And, D2 and D1 may satisfy Equation 5 below.

<Equation 5>

D2/2=D1/2+T1×Tan(FOV/2)

And, D3 and D1 may satisfy Equation 6 below.

<Equation 6>

D3/2=D1/2+(T1+T2)×Tan(FOV/2)

In FIG. 5 , the liquid lens 300 and the first lens 110 may be spaced apart by at least 0.3 millimeters (mm) in consideration of a mechanism for fixing the edge of the lens.

Table 2 shows the change of focal length according to the distance from the object in the liquid lens module.

distance from object
(mm)
liquid lens module Focal length of camera module (mm)

radius(mm) diopter Focal length (mm) 10000 10000 0.01 100000.0 3.169 80000 5000 0.02 50000.0 3.169 5000 1000 0.11 9090.91 3.168 2000 280 0.40 2500.00 3.164 1000 118 0.94 1063.83 3.156 800 95 1.17 854.70 3.153 500 60 1.85 540.54 3.143 300 35 3.18 314.47 3.124 200 23 4.83 207.04 3.101 150 17.2 6.46 154.80 3.078 120 13.7 8.11 123.30 3.056 100 11.4 9.75 102.56 3.034

The distance to the object may be the shortest distance from the front surface S01 of the liquid lens 300 to the object, and the curvature is the curvature of the interface between the first and second liquids in the liquid lens 300, diopter and focus The distance may be the diopter and focal length of the liquid lens.

When the F number of the camera module is limited to 1.6 to 3, the values of D1 and D3, FOV, and T1 and T2 are as follows. Tables 3 to 6 show the relationship between the values of D1 and D3, FOV, and T1 and T2 when the size of the second opening of the liquid lens 300 is 2.3 millimeters to 5.1 millimeters, and each numerical value is in millimeters (mm). ) may be a unit.

D1 1.1 1.8 1.9 2 2.1 2.2 2.5 FOV 80 80 80 80 80 80 80 T2 0.6 0.8 0.8 One One One One T1 0.5 0.5 0.5 0.5 0.5 0.5 0.5 D3 2.95 3.98 4.08 4.52 4.62 4.72 5.02

D1 1.8 1.8 1.8 1.8 1.8 1.8 1.8 FOV 70 73 77 80 83 86 90 T2 0.6 0.8 0.8 One One One One T1 0.5 0.5 0.5 0.5 0.5 0.5 0.5 D3 3.34 3.72 3.87 4.32 4.45 4.60 4.80

D1 1.8 1.8 1.8 1.8 1.8 1.8 1.8 FOV 80 80 80 80 80 80 80 T2 0.4 0.5 0.6 0.7 0.8 0.9 One T1 0.5 0.5 0.5 0.5 0.5 0.5 0.5 D3 3.31 3.48 3.65 3.81 3.98 4.15 4.32

D1 1.8 1.8 1.8 1.8 1.8 1.8 1.8 FOV 80 80 80 80 80 80 80 T2 0.8 0.8 0.8 0.8 0.8 0.8 0.8 T1 0.3 0.33 0.37 0.4 0.43 0.47 0.5 D3 3.65 3.70 3.81 3.86 3.86 3.93 3.98

In Tables 3 to 6, D1 has a value of 1.1 to 2.5 millimeters, FOV has a value of 70 degrees to 90 degrees, T2 has a value of 0.6 to 0.8 millimeters, T1 has a value of 0.3 to 0.5 millimeters , D3 may have a value of 2.36 to 5.10 millimeters.

6 is a diagram illustrating a relationship between a focal length of a camera module and a distance between an object according to an embodiment, and FIG. 7 is a diagram illustrating a relationship between a focal length and a diopter of a liquid lens in a camera module according to an embodiment.

In the lens assembly including the liquid lens according to the embodiment, the distance from the front surface S01 of the liquid lens to the rear surface S62 of the sixth lens is fixed, and the focal length and diopter of the liquid lens inside may be varied. Thus, AF may be possible without moving the lenses in the lens assembly.

The camera module including the above-described imaging lens may be embedded in various digital devices such as digital cameras, smartphones, notebook computers, and tablet PCs, and in particular, it is embedded in mobile devices to provide high-performance, ultra-thin A zoom lens can be implemented.

In the above, the embodiment has been mainly described, but this is only an example and does not limit the present invention, and those of ordinary skill in the art to which the present invention pertains are not exemplified above in the range that does not depart from the essential characteristics of the present embodiment. It can be seen that various modifications and applications are possible. For example, each component specifically shown in the embodiment can be implemented by modification. And differences related to such modifications and applications should be construed as being included in the scope of the present invention defined in the appended claims.

Claims (11)

a holder having a through hole in the optical axis direction;
a liquid lens disposed on the holder;
a solid lens unit disposed under the liquid lens;
an aperture disposed between the liquid lens and the solid lens unit;
a sensor substrate electrically connected to the liquid lens;
and an image sensor disposed on the optical axis direction of the liquid lens and mounted on the sensor substrate,
The liquid lens includes a conductive liquid and a non-conductive liquid accommodated in a cavity, wherein the cavity includes a first opening in an object-side direction and a second opening in an upward direction, and the size of the first opening is that of the second opening. larger than the size,
The solid lens unit includes first to fifth lenses disposed in the direction of the sensor substrate from the direction of the liquid lens,
A camera module where 0.75<f1/F<1.1, f1 is the effective focal length of the first lens, and F is the effective focal length of the optical system. According to claim 1,
D3/2=D2/2+T2×Tan(FOV/2), D3 is the size of the first opening, D2 is the size of the second opening, T2 is the thickness of the liquid lens, and FOV is the angle of view of the optical system in-camera module. According to claim 1,
D2/2=D1/2+T1×Tan(FOV/2), D2 is the size of the second opening, D1 is the diameter of the diaphragm, and T1 is the distance from the rear surface of the liquid lens to the solid lens part , and FOV is the angle of view of the optical system, the camera module. According to claim 1,
D3/2=D1/2+(T1+T2)×Tan(FOV/2), D3 is the size of the first opening, D1 is the diameter of the diaphragm, T1 is the solid lens from the back of the liquid lens The camera module is the distance to negative, T2 is the thickness of the liquid lens, and FOV is the angle of view of the optical system. delete delete According to claim 1,
The first lens has a positive refractive power, the second lens has a negative refractive power, the third lens has a positive refractive power, the fourth lens has a positive refractive power, and the second lens has a negative refractive power. 5 The lens is a camera module with negative refractive power. According to claim 1,
1.3<TTL/F<1.6, TTL is the distance from the first surface of the first lens in the object-side direction to the image, and F is the effective focal length of the optical system. According to claim 1,
20<v3d<30, and v3d is the Abbe's number at the d-line of the third lens. According to claim 1,
The liquid lens has a thickness of 0.6 millimeters to 0.8 millimeters,
A distance from the rear surface of the liquid lens to the solid lens unit is greater than 0.3 millimeters and less than 0.5 millimeters. According to claim 1,
The liquid lens,
a first plate having a cavity for accommodating the first conductive liquid and the second non-conductive liquid;
a first electrode disposed on the first plate;
a second electrode disposed under the first plate;
a second plate disposed on the first electrode; and
A camera module comprising a; a third plate disposed under the second electrode.

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