KR102404860B1 - Camera module and manufacturing method thereof - Google Patents

Abstract

A camera module and a manufacturing method thereof are disclosed. The camera module includes: a body in which one or more lenses are accommodated and a movable lens unit is movably mounted in an optical axis direction; and a fixed lens unit including a flat plate portion having a flat plate shape, and a holding portion formed in a body of the flat plate portion to form a light transmitting hole and accommodate one or more lenses.

Description

Camera module and manufacturing method thereof

The present invention relates to a camera module, and more particularly, to a camera module to which a foreign object prevention structure is applied and an aperture is provided, and to a method of manufacturing the same. The camera module of the present invention may be provided with an AF driver for moving the lens in the optical axis direction for autofocusing, and an OIS driver for moving the lens in a direction perpendicular to the optical axis for image stabilization processing.

Mobile devices such as smart phones are equipped with a camera module for the purpose of shooting and video calls, and the camera module is equipped with an AF actuator (AF Actuator or VCM) for realizing an auto-focusing function.

1 is an exploded perspective view of a camera module according to the prior art, and FIG. 2 is a cross-sectional view showing a possible foreign material inflow path in a camera module to which an AF driver according to the prior art is applied.

Referring to FIG. 1 , the camera module includes a lens unit 10 , a body unit 20 , an infrared cut filter 30 , an image sensor 40 , a printed circuit board 50 , and a connector 60 . include

The lens unit 10 may be a lens barrel having a holder structure for accommodating one or more lenses, and is installed at a position corresponding to the image sensor 40 installed below.

The body part 20 may include an actuator part and a base part.

The actuator unit fixes the lens unit 10 so as to be positioned therein, and moves the lens unit 10 in the optical axis direction to adjust the focus of the image. As illustrated in FIG. 2 , the actuator unit may include a lens carrier 21 and an AF driver coupled to the outer surface of the lens unit 10 to fix the lens unit 10 . The AF driver may include a coil 22 mounted on the outer circumferential surface of the lens carrier 21 and a magnet 23 mounted at a position corresponding to the outer surface of the coil 22, and the magnet 23 is a yoke unit. position can be fixed by

An infrared cut filter 30 is mounted on the base portion in the form of closing the hollow formed in the center of the base portion in the optical axis direction. The base part is coupled to the main area of the printed circuit board 50 in a shape to accommodate the image sensor 40 in the internal space. In this case, the image sensor 40 is located below the infrared cut filter 30 .

The image sensor 40 is mounted on the upper surface of the main area of the printed circuit board 50 so as to be aligned with one or more lenses accommodated in the lens unit 10 along the optical axis direction. The image sensor 40 converts the optical signal of the subject incident through the lens into an electrical signal.

The printed circuit board 50 includes a main area in which the lens unit 10 , the body 20 and the image sensor 40 are positioned on the upper side, and a sub area electrically connected to the main area. A connector 60 for electrically connecting the camera module to the main board (not shown) may be provided in the sub region.

Referring to FIG. 2 , the AF driver provided in the actuator includes a coil 22 and a magnet 23 that are spaced apart to face each other. A current is applied to the coil 22 , and an autofocusing process is performed in which the lens carrier 21 on which the lens unit 10 is mounted is moved in the optical axis direction by electromagnetic force generated between the coil 22 and the magnet 23 .

As shown, there is a gap between the upper surface and the inner circumferential surface of the actuator part, and a foreign material can be introduced into the camera module through the gap and move to the upper part of the infrared cut-off filter 30 .

However, when a foreign material is introduced into the camera module, there is a problem that not only prevents precise driving of an AF driver such as a voice coil motor (VCM), but also impairs the quality of a captured image.

In addition, as the high-pixel processing is required, the size and weight of the lens unit 10 to be moved for the auto-focusing process are relatively large. However, due to the demand for miniaturization of the camera module, the size of the AF driver of the camera module is limited, and there is a problem in that the lens unit 10 cannot be effectively moved to a required position due to insufficient electromagnetic force generated by the AF driver.

Korean Patent Publication No. 10-2016-0068133 Korean Patent No. 10-2174068

An object of the present invention is to provide a camera module and a method for manufacturing the same, which prevent foreign substances from flowing into the interior of the body, thereby blocking the cause of defects in the camera module due to foreign substances.

The present invention divides the provided lenses into a fixed lens and a movable lens, and allows only the movable lenses to be moved by the electromagnetic force of the AF driver. it is for

An object of the present invention is to provide a camera module capable of minimizing an increase in weight due to installation of an iris for adjusting the amount of light, and maintaining a miniaturized size while having an iris, and a method for manufacturing the same.

Objects other than the present invention will be easily understood through the following description.

According to an aspect of the present invention, a body portion on which one or more lenses are accommodated in a movable lens portion movably mounted in the optical axis direction; and a fixed lens part including a flat plate part having a flat plate shape and a holding part formed in a body of the plate part to form a light transmitting hole and to accommodate one or more lenses, wherein the lens accommodated in the movable lens part and the holding part are accommodated in the holding part There is provided a camera module, characterized in that the fixed lens unit is fixedly attached to the upper surface of the body unit so that the optical axes of the lenses coincide.

The fixed lens unit may be sized to cover both the gap formed on the upper surface of the body and the light transmitting hole, and may be closely fixed to the upper surface of the body.

The body portion may include: a lens carrier to which the movable lens portion is fastened; and an AF driver for moving the lens carrier toward or away from the lens accommodated in the fixed lens unit in an optical axis direction to perform an autofocusing function.

The body portion may further include an OIS driver for moving the lens carrier in a direction perpendicular to the optical axis.

An iris may be mounted on the upper surface of the holding part so that the optical axes coincide.

The diaphragm includes a variable region having a circular penetrating region in a central region, and a supporting region formed to surround the periphery of the variable region, wherein the variable region and the supporting region are the same to form concentric circles sharing a central point of the penetrating region It may be formed by being combined on a plane.

The variable region may be formed of smart window glass whose transparency is adjusted by electrical stimulation, or may be formed by attaching a smart window film to the surface of a transparent object so that the size of the diameter of the light incident path of the aperture can be adjusted.

According to another aspect of the present invention, a moving lens unit in which one or more lenses are accommodated is mounted to the body to be movable in the optical axis direction; and a fixed lens unit fixedly attached to the upper surface of the body unit. Here, the fixed lens unit is formed to include a flat plate portion, a holding portion formed in a body of the flat portion to form a light transmitting hole and accommodate one or more lenses, and a circular penetration in the central region on the upper surface of the holding portion An diaphragm comprising a variable region having a region and a support region formed to surround the periphery of the variable region is mounted, the lens accommodated in the movable lens unit, the lens accommodated in the holding unit, and the diaphragm are installed so that optical axes coincide with each other, and The variable region may be formed of a material whose transparency is adjusted by electrical stimulation.

Other aspects, features and advantages other than those described above will become apparent from the following drawings, claims, and detailed description of the invention.

According to an exemplary embodiment of the present invention, there is an effect of blocking a cause of defects in the camera module due to foreign substances by preventing foreign substances from flowing into the interior of the body.

In addition, by dividing the provided lenses into a fixed lens and a moving lens, and allowing only the moving lenses to move by the electromagnetic force of the AF driver, there is an effect that precise autofocusing processing is possible even with a small AF driver.

In addition, there is an effect of minimizing an increase in weight due to the installation of the diaphragm for controlling the amount of light, and maintaining a miniaturized size while having the diaphragm.

1 is an exploded perspective view of a camera module according to the prior art.
Figure 2 is a cross-sectional view showing a foreign material inflow path in the camera module to which the AF driver according to the prior art is applied.
3 is an exploded perspective view of a camera module according to an embodiment of the present invention;
4 is a view showing a coupling form between the fixed lens unit and the body according to an embodiment of the present invention.
5 is a view for explaining the shape and operating state of the diaphragm according to an embodiment of the present invention.
6 is a view showing a method of manufacturing a camera module according to an embodiment of the present invention.

Since the present invention can have various changes and can have various embodiments, specific embodiments are illustrated in the drawings and described in detail. However, this is not intended to limit the present invention to specific embodiments, and it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

When an element is referred to as being “connected” or “connected” to another element, it is understood that it may be directly connected or connected to the other element, but other elements may exist in between. it should be On the other hand, when it is said that a certain element is "directly connected" or "directly connected" to another element, it should be understood that the other element does not exist in the middle.

The terminology used herein is used only to describe specific embodiments, and is not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise. In the present specification, terms such as “comprise” or “have” are intended to designate that a feature, number, step, operation, component, part, or combination thereof described in the specification exists, but one or more other features It should be understood that this does not preclude the existence or addition of numbers, steps, operations, components, parts, or combinations thereof.

In addition, in the description with reference to the accompanying drawings, the same components regardless of the reference numerals are given the same or related reference numerals, and the overlapping description thereof will be omitted. In describing the present invention, if it is determined that a detailed description of a related known technology may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted.

In addition, terms such as “…unit”, “…unit”, “…module”, “…group”, etc. described in the specification mean a unit that processes at least one function or operation, which is hardware or software or hardware and software It can be implemented as a combination of

3 is an exploded perspective view of a camera module according to an embodiment of the present invention, FIG. 4 is a view showing a coupling form between a fixed lens unit and a body according to an embodiment of the present invention, and FIG. 5 is an embodiment of the present invention It is a drawing for explaining the shape and operation state of the diaphragm part according to an embodiment.

Referring to FIG. 3 , the camera module includes a fixed lens unit 110 , a moving lens unit 120 , a body unit 20 , an aperture unit 140 , an infrared cut filter 30 , and an image sensor 40 . ), a printed circuit board 50 , and a connector 60 .

The fixed lens unit 110 includes a flat plate portion having a flat plate shape and a holding portion having a holder structure formed in the flat portion body to form a light passage hole.

The flat plate part and the holding part may be integrally formed, but may be formed by fastening the holding part of the holder structure to a hole formed in the body of the flat plate part.

At least one of a plurality of lenses to be provided in the camera module is accommodated in the holding unit. Hereinafter, for convenience of classification, the lens accommodated in the holding unit of the fixed lens unit 110 will be referred to as a fixed lens.

The fixed lens unit 110 in which the flat plate is formed to extend outward at a predetermined height (eg, the lower end region) of the peripheral surface of the holding unit is arranged such that the fixed lens accommodated in the holding unit is aligned with the image sensor 40 in the optical axis direction. When positioned so as to be possible, it may be formed in a size that covers both the light transmitting hole and the gap formed on the upper surface of the body 20 .

In addition, the shape of the circumferential surface of the flat portion may be formed to correspond to the shape of the circumferential surface of the upper surface of the body 20 .

3 to 5 illustrate a case in which the holding portion is formed to protrude from the flat portion because the height of the holding portion is relatively large compared to the thickness of the flat portion, but it is natural that the thickness of the flat portion may be formed to match the height of the holding portion.

The fixed lens unit 110 is fixedly disposed on the upper surface of the body 20 to cover the gap formed on the upper surface of the body 20, so as to prevent foreign matter from entering the camera module, as well as to protect against external shocks. It can also function as a protective cover to protect the camera module against

The movable lens unit 120 may be a lens barrel having a holder structure for accommodating the rest of the plurality of lenses to be provided in the camera module. Hereinafter, for convenience of classification, the lens accommodated in the lens barrel of the movable lens unit 120 will be referred to as a movable lens.

The moving lens unit 120 is installed in the body unit 20 such that the receiving moving lens is aligned along the optical axis direction with the image sensor 40 installed thereunder.

The body part 20 may include an actuator part and a base part. Here, the actuator part and the base part may be integrally formed or formed separately so that the base part may be fastened to the lower part of the actuator.

The actuator unit fixes the moving lens unit 120 to be positioned inside, and moves the moving lens unit 120 in the optical axis direction for autofocusing. As illustrated in FIG. 4 , the actuator unit may include a lens carrier 21 and an AF driver coupled to the outer surface of the moving lens unit 120 to fix the moving lens unit 120 .

The AF driver may include a coil 22 mounted on the outer circumferential surface of the lens carrier 21 and a magnet 23 mounted at a position corresponding to the outer surface of the coil 22, and the magnet 23 is a yoke unit. position can be fixed by Of course, if they can be mounted at positions corresponding to each other, the attachment positions of the coil 22 and the magnet 23 may be different.

The magnitude of the electromagnetic force generated by the coil 22 and the magnet 23, that is, the AF driver may be calculated by a well-known physical formula F=nBil. Here, n is the number of turns of the coil 22 , B is the magnetic flux density of the magnet 23 , i is the amount of current applied to the coil 22 , and l is the coil 22 positioned in the magnetic flux of the magnet 23 . ) is the length of

Recently, the need for high-pixel image processing is increasing, and accordingly, the number, size and weight of lenses, and the number of parts constituting the lens unit are increasing. For this reason, according to the structure of the camera module according to the prior art, the AF driver must generate a greater electromagnetic force to move the lens unit of increased weight.

However, in the technology development situation to improve the miniaturization and power saving ability of the camera module, increasing the number of turns of the coil 22 or increasing the magnetic flux density of the magnet 23 has a problem of increasing the size of the camera module. Not appropriate. Also, it is not appropriate to increase the amount of current applied to the coil 22 as it increases power consumption.

In order to solve this problem, in the camera module according to the present embodiment, some of the plurality of lenses to be provided for high-pixel image processing are arranged in the fixed lens unit 110 , and only the rest are arranged in the moving lens unit 120 . There is a characteristic.

Through this, by limiting the object that the AF driver provided in the actuator unit has to move in the optical axis direction for autofocusing to the moving lens unit 120, even if the AF driver generates a small electromagnetic force, it is possible to effectively perform precise autofocusing processing. There are advantages to doing so.

Although not shown, the lens carrier 21 of the actuator unit fixing the movable lens unit 120 may be moved in a direction perpendicular to the optical axis for an optical image stabilization (OIS) function. To this end, an OIS driver including a magnet and a coil may be further included in the actuator unit.

A fixed lens unit 110 is attached to the upper surface of the body unit 20 for accommodating the moving lens unit 120 .

In this case, the lenses provided in each of the fixed lens unit 110 and the movable lens unit 120 are positioned to align with the lower image sensor 40 in the optical axis direction.

In addition, the flat plate portion of the fixed lens unit 110 has an arrangement shape in which a gap existing on the upper surface of the body portion 20 is not exposed to the outside, and the lower surface of the flat portion and the upper surface of the body portion 20 are in contact with each other. (see "A" in FIG. 4). The fixed lens unit 110 and the flat plate unit may be fixedly attached to each other by, for example, bonding.

On the upper surface of the holding part of the fixed lens unit 110 , the lens accommodated in the fixed lens unit 110 and the movable lens unit 120 , respectively, and the aperture unit 140 are fixedly attached to the image sensor 40 so as to be aligned in the optical axis direction. can

As illustrated in FIGS. 4 and 5 , the diaphragm unit 140 includes a variable region 142 having a circular through region 141 in a central region, and a support region formed to surround the periphery of the variable region 142 . (143) may be formed to include.

That is, the diaphragm 140 is formed in a divided structure including a through region 141 , a variable region 142 , and a support region 143 , and the variable region 142 and the support region outside the through region 141 . 143 may be formed by being combined on the same plane while forming concentric circles sharing the center point of the through region 141 . Of course, the shape of the outer peripheral surface of the support region 143 may not be circular. Also, the shape of the outer circumferential surface of the support region 143 may be formed to correspond to the shape of the outer circumferential surface of the fixed lens unit 110 .

The through region 141 is a region that introduces light into the interior of the camera module without limitation, whereas the variable region 142 variably introduces or blocks light depending on whether power is applied. The support region 143 may be a region for the diaphragm unit 140 to attach to the upper surface of the holding unit of the fixed lens unit 110 .

The variable region 142 may be formed of, for example, an active smart window whose transparency is adjusted by electrical stimulation.

For the variable region 142 , for example, Polymer Dispersed Liquid Crystal (PDLC) may be applied, and micron-sized liquid crystal particles uniformly dispersed in a polymer matrix are arranged in a direction changed by an external voltage, so that the transparency is changed. may have a regulated structure. In addition, a structure in which transparency is adjusted according to a voltage applied to the variable region 142 may be varied.

The variable region 142 may be made of a smart window glass of a predetermined thickness so that the transparency is adjusted by electrical stimulation, but a film (eg, a smart window film) for performing the above-described operation is transparent with a predetermined thickness. It may be formed by being attached to the surface of an object.

In order to apply and control power for adjusting the transparency of the variable region 142 , the variable region 142 may be electrically connected to the printed circuit board 50 and the like.

As illustrated in (a) of FIG. 5 , when power is not applied to the variable region 142 and the variable region 142 remains in an opaque state, light enters the camera module only through the through region 141 . is brought in That is, when no power is applied to the variable region 142 , the diaphragm 140 forms a light incident path having a relatively small diameter.

On the other hand, as illustrated in FIG. 5B , when power is applied to the variable region 142 and the variable region 142 is converted to a transparent state, the through region 141 and the variable region 142 pass through the variable region 142 . Light is introduced into the camera module. That is, when power is applied to the variable region 142 , the diaphragm 140 forms a light incident path having a relatively large diameter.

As such, the diaphragm unit 140 may be controlled to form light incident paths of various sizes according to the photographing environment by whether or not power is applied.

By adjusting the diameter of the light incident path to adjust the amount of light, the aperture unit 140 has a simple structure that is controlled by whether or not power is applied. , there is an advantage of being able to maintain a miniaturized size while having an aperture.

Referring back to FIG. 3 , the infrared cut filter 30 is mounted on the base of the body 20 to close the hollow formed in the center of the base. The base part is coupled to the main area of the printed circuit board 50 in a shape to accommodate the image sensor 40 in the lower portion of the infrared cut-off filter 30, and to accommodate the image sensor in the internal space.

The image sensor 40 is mounted on the upper surface of the main area of the printed circuit board 50 so as to be aligned along the optical axis direction with the lenses accommodated in each of the fixed lens unit 110 and the moving lens unit 120 . The image sensor 40 converts the optical signal of the subject incident through the lens into an electrical signal.

The printed circuit board 50 includes a main region in which the fixed lens unit 110 , the movable lens unit 120 , the body unit 20 and the image sensor 40 are positioned on the upper side, and a sub region electrically connected to the main region. includes A connector 60 for electrically connecting the camera module to the main board (not shown) may be provided in the sub region.

6 is a view showing a method of manufacturing a camera module according to an embodiment of the present invention.

For the manufacture of the camera module, first, as illustrated in FIG. 6A , the moving lens unit 120 and the body unit 20 are fastened. Some of the lenses to be provided in the camera module may be accommodated in the movable lens unit 120 . The actuator part of the body part 20 is provided with an AF driver for moving the moving lens part 120 in the optical axis direction for autofocusing.

Next, as illustrated in (b) of FIG. 6 , an infrared cut filter 30 is mounted on the base to close the hollow formed in the center of the base of the body 20 in the optical axis direction.

Subsequently, as illustrated in (c) of FIG. 6 , the movable lens unit 120 is fastened, and the body unit 20 to which the infrared cut filter 30 is mounted is a printed circuit board on which the image sensor 40 is mounted. 50 is mounted on the main area. At this time, the image sensor 40 is located in the inner space of the base portion of the body portion (20).

Subsequently, as illustrated in (d) of FIG. 6 , the fixed lens unit 110 is fixedly attached to cover the upper surface of the body unit 20 .

The fixed lens unit 110 is manufactured in a shape in which a holding unit for accommodating one or more lenses and a flat surface to extend outward from a predetermined height of the peripheral surface of the holding unit is formed, and the fixed lens unit 110 includes the body unit 20 . It is arranged and fixed on the upper surface of the body part 20 in a shape that covers both the light transmission hole and the gap formed on the upper surface of the .

In this case, it is natural that the lens and the image sensor 40 accommodated in each of the fixed lens unit 110 and the movable lens unit 120 are arranged to be aligned in the optical axis direction.

The diaphragm unit 140 is fixedly disposed on the upper surface of the holding unit of the fixed lens unit 110 , and the diaphragm unit 140 has the upper surface of the holding unit before or after the fixed lens unit 110 is fixedly arranged on the body unit 20 . can be fixed to

So far, the manufacturing process of the camera module according to the present embodiment has been described with reference to FIG. 6 . However, it is natural that the manufacturing process of the camera module is not limited thereto.

For example, a process in which the movable lens unit 120 is fastened to the body 20 and the fixed lens unit 110 is fixedly disposed on the upper surface of the body 20 may be preceded. Thereafter, the infrared cut filter 30 may be mounted on the body 20 , and the body 20 may be mounted on the main area of the printed circuit board 50 on which the image sensor 40 is mounted.

According to the camera module and its manufacturing method according to the present embodiment, it is possible to eliminate the possibility of malfunction of the camera module due to the inflow of foreign substances, and only some of the provided lenses are moved so that even a small AF driver can provide precise auto Focusing processing is possible.

In addition, it is possible to minimize an increase in weight due to the installation of an iris for controlling the amount of light, and to maintain a miniaturized size while having the diaphragm.

Although the above has been described with reference to the embodiments of the present invention, those of ordinary skill in the art can variously modify the present invention within the scope without departing from the spirit and scope of the present invention described in the claims below. and may be changed.

10: lens unit 20: body unit
21: lens carrier 22: coil
23: magnet 30: infrared cut filter
40: image sensor 50: printed circuit board
60: connector 110: fixed lens unit
120: moving lens unit 140: aperture unit
141: through region 142: variable region
143: support area

Claims (8)

a body part on which a movable lens part accommodating m lenses, which is a part of n lenses provided in the camera module, is mounted movably in the optical axis direction; and
A fixed lens unit including a flat plate portion and a holding portion formed in the body of the flat plate portion to accommodate the remaining nm lenses among the n lenses provided in the camera module, the light transmitting hole being formed therein,
The body part,
a lens carrier to which the movable lens unit accommodating the m lenses is fastened;
AF driver for moving the lens carrier relatively approaching or away from the optical axis direction by using the electromagnetic force of a coil and a magnet with respect to the number of nm lenses accommodated in the fixed lens unit in order to perform the autofocusing function; and
and an OIS driver for moving the lens carrier in a direction perpendicular to the optical axis,
The fixed lens unit including the holding unit in which the number of nm lenses is accommodated is formed in a size to cover both the gap and the light transmission hole formed on the upper surface of the body, and is fixed in close contact with the upper surface of the body as a cover for preventing the inflow of foreign matter,
The m lenses accommodated in the moving lens unit and the nm lenses accommodated in the holding unit are positioned so that optical axes coincide with each other,
The camera module, characterized in that each of n and m is a predetermined natural number.
delete delete delete According to claim 1,
The camera module, characterized in that the aperture part is mounted on the upper surface of the holding part included in the fixed lens part closely fixed to the upper surface of the body part so that the optical axes coincide.
6. The method of claim 5,
The stop portion includes a variable region having a circular through region in a central region and a support region formed to surround the periphery of the variable region,
The variable region and the support region are formed by being coupled on the same plane to form a concentric circle sharing a central point of the through region.
7. The method of claim 6,
The variable region is formed of a smart window glass whose transparency is adjusted by electrical stimulation, or a smart window film is attached to the surface of a transparent object so that the size of the diameter of the light incident path of the aperture can be adjusted. camera module.
a step of mounting a moving lens unit accommodating m lenses, which are some of the n lenses provided in the camera module, to the body portion to be movable in the optical axis direction; and
Comprising the step of fixedly attaching a fixed lens unit to the upper surface of the body unit,
The fixed lens part is formed to include a flat plate part, a holding part formed in the body of the flat plate part to accommodate the remaining nm lenses among the n lenses provided in the camera module, the light transmitting hole being formed,
The body part,
a lens carrier to which the movable lens unit accommodating the m lenses is fastened;
AF driver for moving the lens carrier relatively approaching or away from the optical axis direction by using the electromagnetic force of a coil and a magnet with respect to the number of nm lenses accommodated in the fixed lens unit in order to perform the autofocusing function; and
It includes an OIS driver for moving the lens carrier in a direction perpendicular to the optical axis,
The fixed lens unit including the holding unit in which the number of nm lenses is accommodated is formed in a size to cover both the gap and the light transmission hole formed on the upper surface of the body, and is closely fixed to the upper surface of the body as a cover for preventing the inflow of foreign matter,
Each of n and m is a predetermined natural number,
On the upper surface of the holding part included in the fixed lens part closely fixed to the upper surface of the body part, an diaphragm comprising a variable region having a circular penetrating region in a central region and a support region formed to surround the periphery of the variable region is mounted, ,
The m lenses accommodated in the moving lens unit, the nm lenses accommodated in the holding unit, and the diaphragm unit are installed so that the optical axes coincide with each other,
The method of manufacturing a camera module, characterized in that the variable region is formed of a material whose transparency is adjusted by electrical stimulation.

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