KR20190118018A - Lens assembly - Google Patents

Abstract

The present invention relates to a micro lens assembly comprising: a base; a support inserted into the base to be moved in an optic axis direction; a driving part for automatic focus adjustment to move the support in the optic axis direction; a lens unit inserted into the support to be moved in a direction perpendicular to the optic axis direction, and provided with a lens barrel to which a lens part is coupled; a driving part for image stabilization to move the lens unit in a direction perpendicular to the optic axis direction; a first guide member arranged between the support and the base to allow the support to be moved with respect to the base in the optic axis direction; a second guide member arranged between the lens unit and the support to allow the lens unit to be moved with respect to the support in a direction perpendicular to the optic axis direction; and an aperture unit wherein a portion thereof is arranged to penetrate the lens barrel in a direction perpendicular to the optic axis direction to adjust a light quantity passing through the lens part.

Description

Lens assembly {LENS ASSEMBLY}

The present invention relates to a lens assembly, and more particularly to a micro lens assembly having an auto focus function and a camera shake correction function.

In general, the lens assembly is gradually miniaturized according to the development of the technology, and is manufactured to perform the auto focus function or the auto focus function and the image stabilization function together to obtain a high quality shot image.

The auto focus is a function of automatically focusing on a specific subject by moving the lens forward or backward. In addition, optical image stabilizer (OIS) detects the shake of an electronic device (for example, a smartphone or a small mobile device) with a gyro sensor to finely move the lens in the opposite direction to which the mobile device moves. It is a function to correct. The lens movement during image stabilization is perpendicular to the direction of lens movement during autofocus.

Such a conventional lens assembly is manufactured in a small size for application to a small mobile device such as a smart phone. This requires a precise structure that can accurately move the lens within the micro lens assembly.

An object of the present invention is to provide a compact lens assembly capable of precisely moving the lens in order to improve the auto focus and image stabilization function, and having an aperture to control the amount of light.

In order to achieve the above object, the present invention is a base; A support movably inserted into the base in the optical axis direction; An auto focus driver for moving the support in the optical axis direction; A lens unit inserted into the support to be movable in a direction perpendicular to the optical axis direction and having a lens barrel having a lens unit coupled thereto; Image stabilization driving unit for moving the lens unit in a direction perpendicular to the optical axis direction; A first guide member disposed between the support and the base such that the support is movable in the optical axis direction with respect to the base; A second guide member disposed between the lens unit and the support such that the lens unit is movable in a direction perpendicular to the optical axis direction with respect to the support; And an aperture unit partially disposed to penetrate the lens barrel in a direction perpendicular to the optical axis direction to adjust an amount of light passing through the lens unit.

The aperture unit may include: first and second blades passing through the lens barrel and stacked on each other; A rotary arm connected to the first and second blades and rotatably coupled to a portion of the lens unit; And a magnet coupled to one surface of the rotary arm, and a driving unit including a coil disposed to face the magnet at intervals.

It may further include a shielding member provided in the lens unit to surround a portion of the rotary arm.

The lens unit, the body having the coupling portion; And it may include a moving member coupled to the coupling portion.

The lens unit may include a guide pin penetrating the coupling part; A plurality of ball bearings in slidable contact along the guide pin; And a pair of retainers surrounding the guide pins and the plurality of ball bearings rotatably coupled to each other, wherein the body is guided to the guide pins to move in a first direction, by the plurality of ball bearings. The movable member may move together in a second direction perpendicular to the first direction.

The movable member may have a pair of insertion grooves in which both ends of the guide pin protruding from both sides of the coupling part are inserted and fixed.

The coupling portion of the body may be formed with a length shorter than the interval between the pair of extension portions to be movable in the first direction between the pair of extension portions formed on both sides of the moving member.

As described above, an embodiment of the present invention has the advantage that the lens unit is supported by the guide pin unit and the plurality of ball bearings so that it can be stably moved and precise control is possible.

In addition, according to an embodiment of the present invention, the diaphragm penetrates through the lens barrel and is disposed between the lenses to provide a diaphragm while maintaining a compact size, and has an advantage of controlling the amount of light by the diaphragm.

1 is a perspective view showing a micro lens assembly according to an embodiment of the present invention.
2 and 3 are exploded perspective views showing a micro lens assembly according to an embodiment of the present invention.
4 is a perspective view illustrating a state in which a support and a lens unit are coupled together to a base.
5 is a perspective view showing the support.
6 is an exploded perspective view showing a lens unit.
7 is a plan view showing a state in which the support unit is coupled to the lens unit.
FIG. 8 is a cross-sectional view taken along the line VII-VII shown in FIG. 7.
9 is an exploded perspective view illustrating an aperture structure provided in the lens unit.
10 is a perspective view illustrating the aperture driving unit.
11 is a plan sectional view showing an example in which the aperture is set to a small diameter mode.
12 is a plan sectional view showing an example in which the aperture is set to the large-diameter mode.

Hereinafter, various embodiments will be described in more detail with reference to the accompanying drawings. Embodiments described herein may be variously modified. Specific embodiments are depicted in the drawings and may be described in detail in the detailed description. However, the specific embodiments disclosed in the accompanying drawings are only for easily understanding the various embodiments. Therefore, the technical spirit is not limited by the specific embodiments disclosed in the accompanying drawings, and it should be understood to include all equivalents or substitutes included in the spirit and scope of the invention.

Terms including ordinal numbers such as first and second may be used to describe various components, but these components are not limited by the terms described above. The terms described above are used only for the purpose of distinguishing one component from another.

In this specification, the terms "comprises" or "having" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof. When a component is referred to as being "connected" or "connected" to another component, it may be directly connected to or connected to that other component, but it may be understood that other components may be present in between. Should be. On the other hand, when a component is said to be "directly connected" or "directly connected" to another component, it should be understood that there is no other component in between.

In addition, in describing the present invention, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be abbreviated or omitted.

The micro lens assembly according to an embodiment of the present invention may be installed in a small electronic device such as a smart phone and used to photograph an image.

1 is an exploded perspective view showing a micro lens assembly according to an embodiment of the present invention, Figures 2 and 3 is an exploded perspective view showing a micro lens assembly according to an embodiment of the present invention.

1 to 3, the subminiature lens assembly 10 according to an embodiment of the present invention includes a base 100, a support 300 for moving the lens along the Z-axis direction for auto focus, and hand shaking. A lens unit 500, an aperture unit 600, and a cover 700 that move the lens along the XY plane for correction may be included.

The base 100 may be installed at a portion of a small electronic device (not shown), and an image sensor (not shown) may be disposed below the base 100. The base 100 has a predetermined space in which the support 300 moves along the Z-axis direction, and a light passing hole 101 is formed on the bottom surface of the base 100 so that light can be irradiated with the image sensor.

The base 100 may have a substantially rectangular parallelepiped shape, and the first to fourth coils 211, 221, 231, and 241 may be disposed on four side surfaces thereof. Here, the first coil 211 is part of the auto focus driver, the second and third coils 221 and 231 are part of the camera shake correction driver, and the fourth coil 241 is used as part of the aperture driver.

The first coil 211 together with the first magnet 213 forms a drive for autofocus control for moving the support 300 along the Z-axis direction for autofocus. The autofocus driving unit moves the support 300 in the + Z axis direction or the -Z axis direction through interaction with the first magnet 213 according to the direction (one direction and the opposite direction) of the current applied by the first coil 211. Move to. The first magnet 213 is disposed on one side of the support 300, and when the support 300 is disposed in the inner space of the base 100, the first magnet 213 is disposed at regular intervals facing the first coil 211.

In addition, the first coil 211 may be electrically connected to the first printed circuit board 217 installed in the base 100. The first printed circuit board 217 is provided with a plurality of terminals 219 for receiving power and control signals from the outside. The Hall sensor 215 may be mounted on the first printed circuit board 217. The hall sensor 215 may be located inside the closed first coil 211 to detect the movement of the first magnet 213 and transmit a detection signal to a controller (not shown) of the small electronic device. The control unit performs the Z-axis direction control of the support 300 through the Hall sensor and the autofocus control unit.

The second coil 221 may be disposed on an inner surface facing the inner surface of the base where the first coil 211 is disposed. The second coil 221 together with the second magnet 223 forms a first image stabilization driving unit for moving the body 550 of the lens unit 500 along the X-axis direction for image stabilization. The first image stabilization driving unit moves the body 550 of the lens unit 500 in the + X-axis direction or the -X-axis through interaction with the second magnet 223 according to the direction of the current applied by the second coil 221. To move in the direction of

In addition, the second coil 221 may be electrically connected to the second printed circuit board 227 installed in the base 100. The second magnet 223 is disposed on one side of the lens unit 500, and the lens unit 500 faces the second coil 221 when the lens unit 500 is disposed in the inner space of the base 100 together with the support 300. Are placed at regular intervals.

The second printed circuit board 227 is provided with a plurality of terminals 229 for receiving power and control signals from the outside. The hall sensor 225 may be mounted on the second printed circuit board 227. The hall sensor may be positioned inside the closed second coil 221 to detect the movement of the second magnet 223 and transmit a detection signal to the controller of the small electronic device. The controller performs the X-axis direction control of the body 550 of the lens unit 500 through the hall sensor of the second printed circuit board and the first camera shake correction driver.

 The third coil 231 may be disposed in a substantially perpendicular direction with respect to the second coil 221. The third coil 231 together with the third magnet 233 forms a second camera shake correction driving unit for moving the lens unit 500 along the Y-axis direction for camera shake correction. The second image stabilizer driver moves the lens unit 500 in the + Y axis direction or the −Y axis direction through interaction with the third magnet 233 according to the direction of the current applied by the third coil 231. .

In addition, the third coil 231 may be electrically connected to the third printed circuit board 237 installed on the base 100, respectively. When the lens unit 500 is disposed in the inner space of the base 100 together with the support 300, the third magnets 233 are disposed at regular intervals while facing the third coils 231, respectively.

In addition, the third printed circuit board 237 is provided with a plurality of terminals 239 for receiving power and control signals from the outside. The hall sensors 235 may be mounted on the third printed circuit board 237, respectively. Each hall sensor may be positioned inside the closed third coil 231 to detect movement of the third magnet 233 and transmit a detection signal to a controller of the small electronic device. The controller controls the Y-axis direction of the support 300 through the hall sensor of the third printed circuit board and the second camera shake correction driver.

As described above, the body 550 of the lens unit 500 is moved in the X-axis direction by the first camera shake correction driver (the second coil 221 and the second magnet 223), and the lens unit 500 The whole is moved to the Y-axis direction by the 1st image stabilizer drive part (3rd coil 231 and the 3rd magnet 233). Accordingly, the lens unit 510 coupled to the body 550 may move in the X-axis and Y-axis directions for the camera shake correction by the first and second camera shake correction drivers.

The fourth coil 241 forms an aperture driving unit, and may be electrically connected to the fourth printed circuit board 247 installed in the base 100. The fourth magnets 243 form an aperture driving unit, and are arranged at intervals facing the fourth coils 241.

In addition, the fourth printed circuit board 247 is provided with a plurality of terminals 249 for receiving power and control signals from the outside. The controller of the small electronic device controls the driving of the aperture by applying a current to the fourth coil 241 in one direction and the opposite direction to rotate the fourth magnet 243 in a clockwise or counterclockwise direction.

4 is a perspective view illustrating a state in which a support and a lens unit are coupled to a base.

3 and 4, the base 100 may include a receiving groove 130 in which a plurality of ball bearings 131 are disposed to guide the support 300 in the Z-axis direction. The receiving groove 130 may be formed inside the base 100, and preferably, may be formed at a position adjacent to one side of the first coil 211. The receiving groove 130 is formed to have a predetermined length along the Z-axis direction.

As shown in Figure 4, when the support 300 is inserted into the inner space of the base 100, the support protrusion 330 formed in a straight line along the Z-axis direction on the outer surface of the support is inserted into the receiving groove 130, the receiving groove ( 130 is divided into two spaces along the Z-axis direction. In this case, the plurality of ball bearings 131 is in contact with the receiving groove 130 and the support protrusion 330 at the same time. Accordingly, the plurality of ball bearings 131 slidably supports the support 300 along the Z-axis direction with respect to the base 100.

In addition, the base 100 may be disposed a plurality of ball bearing 135 in the corner groove 133 of the position adjacent to the other side of the first coil (211). The plurality of ball bearings 135 disposed in the corner grooves 133 contact the corner grooves 331 of the support. The corner groove 331 of the support has a predetermined length in a straight line along the Z-axis direction.

As described above, the plurality of ball bearings 131 and 133 respectively disposed in the receiving groove 130 and the corner groove 331 of the base are disposed between the inner side of the base 100 and the outer side of the support 300 to support the base and the support. The support 300 may be guided in the Z-axis direction while minimizing frictional force between the liver. In this case, since attraction force is generated between the first magnet 213 disposed on the support 300 and the yoke 150 coupled to the base 100, when the support 300 is disposed in the inner space of the base 100, One side of the support 300 provided with the first magnet 213 is pulled into the base 100 provided with the yoke 150 (see FIG. 2). In this state, when the autofocus driving unit is operated, the support 300 moves in the Z-axis direction.

FIG. 5 is a perspective view showing a support, FIG. 6 is an exploded perspective view showing a lens unit, FIG. 7 is a plan view showing a state in which the support is coupled to the lens unit, and FIG. It is a cross section.

Referring to FIG. 5, the support 300 may include a plurality of ball bearings 402, 403, 404, 405 supporting the lens unit 500 such that the lens unit 500 may move along the XY plane.

Specifically, the ball bearings 402 and 403 disposed on both sides of the third magnetic body 235 are disposed in the first and second seating grooves 302 and 303 of the support 300, respectively, and the other bottom surfaces 557 and 558 of the lens unit 500. 6).

Ball bearings 404 and 405 disposed on both sides of the first magnet 213 are disposed in the third and fourth seating grooves 304 and 305 of the support 300, respectively, and support one side of the lens unit 500. In this case, a plurality of third seating grooves 304 are formed, and a plurality of ball bearings 404 are seated one by one in each seating groove 304. Accordingly, when the lens unit 500 is coupled to the inner space of the support 300, the support protrusion 563 formed on the moving member 560 coupled to one side of the body 550 of the lens unit 500 is slidably supported. .

In addition, in the support 300, the second and third magnetic bodies 225 and 235 are disposed at positions corresponding to the second and third magnets 223 and 233, respectively. An attractive force acts between the second and third magnetic bodies 225 and 235 and the second and third magnets 223 and 233 corresponding to the magnetic bodies to pull the lens unit 500 to the bottom side of the support 300. Accordingly, the lens unit 500 may move along the Z-axis direction together with the support 300 while being inserted in the inner space of the support 300, and may not be separated from the support 300, but may be XY relative to the support 300. Movement along the plane is possible.

The lens unit 500 serves to move the lens unit 510 in the XY plane for camera shake correction. The lens unit 500 may be coupled to the lens barrel 530, and the lens unit 510 may be disposed in the lens barrel 530 along the optical axis direction. The lens unit 510 may include a plurality of lenses disposed at intervals along the optical axis direction.

The lens unit 500 has a protrusion 553 that is supported by the guide pin 411 on one side of the lens barrel 530 in the Y-axis direction, and the third magnet 233 is disposed on the other side thereof. In addition, the lens unit 500 includes a second magnet 223 disposed on one side of the lens barrel 530 along the X-axis direction, and a fourth magnet 243 that is a part of the aperture driving unit disposed on the other side of the lens unit 530.

Referring to FIG. 6, the moving member 560 is coupled to a coupling part 590 protruding integrally on one side of the body 550. The moving member 560 has a support protrusion 563 formed in the Y-axis direction on one side of the bottom surface. Accordingly, when the first image stabilization driving unit is operated, the support protrusion 563 is supported by the plurality of ball bearings 404 and the body 550 and the moving member 560 move together in the Y-axis direction.

Referring to FIG. 8, when the second image stabilization driving unit is operated, the body 550 is moved along the guide pin 411 in the X-axis direction by a plurality of ball bearings 414 and 416 disposed in the coupling unit 590. In this case, the moving member 560 does not move in the X-axis direction but only in the Y-axis direction due to the support protrusion 563. Inside the coupling part 590, a pair of retainers 413 and 415 are provided to arrange the ball bearings 414 and 416 at intervals along the circumferential direction of the guide pin 411. The pair of retainers 413 and 415 may be disposed at both inner ends of the coupling part 590.

Coupling portion 590 of the body 550 is shorter than the distance between the pair of extension portions 561a, 561b extending in the X-axis direction perpendicular to the lower portion of the moving member 560. Accordingly, predetermined gaps 567a and 567b are provided between both ends of the coupling part 590 and the respective extension parts 561a and 561b. The body 550 may move a predetermined distance along the guide pin 411 by the gaps 567a and 567b in the X-axis direction.

Both ends of the guide pins 411 protruding to both sides of the coupling portion 590 are inserted and fixed in the insertion grooves 562a and 562b respectively formed in the pair of extension portions 561a and 561b of the movable member 560.

Accordingly, when the lens unit 500 moves along the Y axis direction, the guide pin 411 moves along the Y axis direction together with the moving member 560. Accordingly, the lens unit 510 moving together with the body 550 may move along the Y-axis direction. In addition, the guide pin 411 guides the body 550 to move along the X-axis direction. As a result, the lens unit 510 moving together with the body 550 may move along the X-axis direction.

Hereinafter, the structure and operation of the aperture unit 600 will be described in sequence with reference to FIGS. 9 to 12.

FIG. 9 is an exploded perspective view illustrating an aperture structure provided in a lens unit, FIG. 10 is a perspective view illustrating an aperture driving unit, FIG. 11 is a planar cross-sectional view illustrating an example in which an aperture is set to a small diameter mode, and FIG. 12 is a large aperture. It is a cross-sectional view which shows the example set to the mode.

9 and 10, the aperture unit 600 may include first and second blades 610 and 620, a rotation arm 630, and an aperture driving unit.

The first blade 610 is slidably disposed on one surface of the support plate 650. The first blade 610 is formed with a first light passing hole 611 corresponding to the optical axis, the first coupling hole 613 is connected to the rotary arm 630 at one end. Accordingly, the first blade 610 reciprocates in the X-axis direction as the rotary arm 630 rotates clockwise or counterclockwise.

The second blade 620 is slidably disposed on one surface of the first blade 610. The second blade 620 is formed with a second light passing hole 621 corresponding to the optical axis, the second coupling hole 623 connected to the rotary arm 630 is formed at one end. Accordingly, the second blade 620 reciprocates in the X-axis direction as the rotary arm 630 rotates clockwise or counterclockwise, but moves in the opposite direction to the first blade 610.

The first and second blades 610 and 620 are moved in opposite directions by the rotation arm 630 to change the positions of the first and second light passing holes 611 and 621 so that the small diameter mode (see FIG. 11) and the large diameter mode are changed. The amount of light is adjusted in two steps (see Fig. 12). In addition, the first and second blades 610 and 620 are disposed to penetrate the lens unit 530 in a direction substantially perpendicular to the optical axis. Accordingly, the first and second blades 610 and 620 may have lenses disposed at the front and the rear of the optical axis.

The rotary arm 630 is disposed in a rotatable state on one side of the body 550. In this case, the rotation arm 630 has first and second rotation protrusions 631 and 633 formed at the lower end and the upper end, respectively, in the Z-axis direction. The first rotation protrusion 631 is rotatably inserted into the first insertion hole 503 of the support portion 501 formed in the body 550, the second rotation protrusion 633 is inserted into the second insertion of the support plate 650. It is rotatably inserted into the ball 651.

In addition, as shown in FIG. 10, the rotary arm 630 is provided with a coupling groove 639 to which the fourth magnet 243 is coupled such that the fourth magnet 243 faces the fourth coil 241. The fourth magnet 243 is magnetized into four poles as shown in FIG. 9, and is clockwise or counterclockwise about the first and second rotating protrusions 631 and 633 according to the direction of the current applied to the fourth coil 241. Rotate

In addition, the rotary arm 630 is disposed to be partially surrounded by the shielding member 601, and is not affected by the magnetic field generated by the first to third coils 211, 221, and 231.

The support plate 650 is disposed to penetrate the lens barrel 530 along the X-axis direction perpendicular to the optical axis. The support plate 650 is formed with a light passing hole 653 (see Fig. 11) at a position corresponding to the optical axis.

Hereinafter, a process of setting the small diameter mode and the large diameter mode according to the operation of the aperture unit 600 will be described with reference to FIGS. 11 and 12.

Referring to FIG. 11, in the case of setting the small-diameter mode through the aperture unit 600, when a current is applied to the fourth coil 241 in one direction, a magnetic field is formed, one side of the fourth magnet 243 and the fourth An attraction force is generated between the coils 241, and at the same time, a repulsive force is generated between the other side of the fourth magnet 243 and the fourth coil 241.

Accordingly, the first blade 610 moves toward the fourth coil 241, and at the same time, the second blade 620 moves in a direction opposite to the moving direction of the first blade. In this case, the first light through hole 611 of the first blade and the second light through hole 621 of the second blade may be set to a small diameter mode while minimizing an overlapping area with each other.

Referring to FIG. 12, in the case of setting the large diameter mode through the aperture unit 600, when a current is applied to the fourth coil 241 in a reverse direction, a magnetic field is formed, one side of the fourth magnet 243 and the fourth coil are formed. Repulsive force is generated between the 241 and at the same time an attractive force is generated between the other side of the fourth magnet 243 and the fourth coil 241.

Accordingly, the first blade 610 moves in a direction away from the fourth coil 241 side, and at the same time, the second blade 620 moves in a direction opposite to the moving direction of the first blade. In this case, the first light through hole 611 of the first blade and the second light through hole 621 of the second blade may be set to a large diameter mode while maximizing the overlapping area.

The cover 700 is coupled to the base 100 as shown in FIG. 1, and a light passing hole 701 through which the upper portion of the lens barrel 530 is exposed is formed. In this case, the cover 700 may be made of a metal material capable of shielding electromagnetic waves.

As described above, in the present invention, the lens unit is supported by the guide pin unit and the plurality of ball bearings so that the lens unit can be stably moved, thereby enabling precise control. In addition, the present invention can implement a light amount control function while maintaining a compact size, it is possible to provide a rich expressive power through the depth control of the captured image can improve the image quality.

While the above has been shown and described with respect to preferred embodiments of the invention, the invention is not limited to the specific embodiments described above, it is usually in the technical field to which the invention belongs without departing from the spirit of the invention claimed in the claims. Various modifications can be made by those skilled in the art, and these modifications should not be individually understood from the technical spirit or prospect of the present invention.

100: base 131,133,402,403,404,405: ball bearing
300: support 411: guide pin
500: lens unit 510: lens unit
530: lens barrel 550: body
600: aperture unit 610: first blade
620: second blade 700: cover

Claims (7)

Base;
A support movably inserted into the base in the optical axis direction;
An auto focus driver for moving the support in the optical axis direction;
A lens unit inserted into the support to be movable in a direction perpendicular to the optical axis direction and having a lens barrel having a lens unit coupled thereto;
Image stabilization driving unit for moving the lens unit in a direction perpendicular to the optical axis direction;
A first guide member disposed between the support and the base such that the support is movable in the optical axis direction with respect to the base;
A second guide member disposed between the lens unit and the support such that the lens unit is movable in a direction perpendicular to the optical axis direction with respect to the support; And
And an aperture unit partially disposed to penetrate the lens barrel in a direction perpendicular to the optical axis direction to adjust an amount of light passing through the lens unit. The method of claim 1,
The aperture unit,
First and second blades penetrating the lens barrel and laminated to each other;
A rotary arm connected to the first and second blades and rotatably coupled to a portion of the lens unit; And
And a drive unit for an aperture including a magnet coupled to one surface of the rotary arm and a coil disposed to face the magnet at intervals. The method of claim 2,
The lens assembly further comprises a shielding member provided on the lens unit to surround a portion of the rotary arm. The method of claim 1,
The lens unit,
A body having the coupling portion; And
And a moving member coupled to the coupling part. The method of claim 4, wherein
The lens unit,
A guide pin penetrating the coupling part;
A plurality of ball bearings in slidable contact along the guide pin; And
And a pair of retainers surrounding the guide pin and the plurality of ball bearings rotatably coupled thereto.
The body is guided by the guide pin to move in a first direction, the lens assembly, characterized in that for moving with the moving member in a second direction perpendicular to the first direction by the plurality of ball bearings. The method of claim 5,
The moving member is a lens assembly, characterized in that a pair of insertion grooves are formed in which both ends of the guide pin protruding to both sides of the coupling portion is fixed. The method of claim 6,
The coupling portion of the body is characterized in that the lens assembly is formed with a length shorter than the interval between the pair of extensions to be movable in the first direction between the pair of extensions formed on both sides of the moving member.

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