KR101173111B1 - Focal length control module for lens - Google Patents

Abstract

The present invention relates to a focal length control module of a lens having improved durability, and more particularly, at least one mover installed in the stator moves along the optical axis through thrust generated by the actuator, and is fixed to one point of the optical axis. The focal length adjustment of the durable lens is realized by implementing the stop motion, and implementing the auto focusing (AF) function by adjusting the distance between the image sensor and the lens, or the zoom function by adjusting the distance between the lens and the lens. It is about a module.

Description

Focal length control module for lens with improved durability {Focal length control module for lens}

The present invention relates to a focal length control module of a lens having improved durability, and more particularly, at least one movable member installed in the stator moves along the optical axis through thrust generated by the actuator, and is fixed to one point of the optical axis. The focal point of the durable lens that implements the focusing (AF) function through the focal length control between the image sensor and the lens or the zoom function through the focal length control between the lens and the lens by implementing each stop motion. It relates to a distance control module.

In general, various optical devices, including a camera, a camcorder, and a mobile phone having a built-in camera module, are provided with a focal length adjusting module of an improved lens for obtaining a clear image according to a distance of a subject.

In the focal length control module of the lens, a mover provided with a lens is installed, and the mover receives a thrust through an actuator to implement a focusing function.

In the current optical device, the magnetic coupling force formed between the permanent magnet and the coil is applied to the elastic modulus of the plate spring by using the correlation between the restoring force according to the elastic modulus of the leaf spring and the magnetic coupling force generated between the permanent magnet and the coil. If the restoring force is higher than that, the mover installed with the lens moves between two vertices on the optical axis while pressing the leaf spring, and if the two forces are parallel to each other, the mover installed with the lens on the optical axis stops focusing. Distance control module is installed.

However, the focal length control module of the lens has a disadvantage that the thickness is thick as the leaf spring is accommodated in the thickness direction, and the reaction speed is slow because it takes time until the stable position is fixed by the residual vibration of the spring when the moving momentum is applied. On the other hand, it is difficult to implement the focal length adjusting module of the lens having a zoom function requiring a long moving section because the plate spring operating range is narrow.

On the other hand, the present inventors do not adopt the plate spring of the mover through a plurality of applications and registration rights, such as Korean Patent Registration No. 719799, 944158, 953750, and Korean Patent Application No. 2010-19601, Alternatively, a stopper and a coil made of a magnetic material forming a permanent magnetic force and a metal magnetic coupling force of the permanent magnet and the permanent magnet of the mover are disposed on the movable or stator so that the electric current cannot be generated because the electric current is not supplied to the coil and the stopper and It is proposed a technical idea that the movable element is fixed by the magnetic coupling force formed between the permanent magnets and the movable element is moved when the current is supplied to the coil.

If the stopper is configured to fix the position of the mover, the size of the mover can be reduced by eliminating the leaf spring, and the wide operating range of the mover is secured by securing a wide accommodation space. It is possible to implement the focal length control module of the lens having a zoom function to adjust the distance between them by installing the mover of the.

However, as a result of the inventors implementing the above-described inventions, some problems described below have been found, and the present invention proposes a technical idea that can easily improve these problems.

These problems include stress concentration at the end of the extension line of the coil connected to the terminal portion fixed to the stator as the mover repeatedly moves the focus, and the extension line end of the coil is repeatedly bent due to this stress concentration, thereby causing disconnection at the terminal portion. It has been pointed out that the problem of the problem is that the fixture may be damaged due to an external impact through dropping, and that the mover and the actuator part accommodated in the fixture are damaged.

In addition, when the mover interferes with the cover formed on the fixed body to limit the moving distance, it is pointed out that the noise is generated by the impact caused by the interference.

An object of the present invention devised to solve the above problems is to prevent the repetitive bending of the extension line formed between the coil and the terminal piece according to the movement of the mover to prevent the disconnection of the terminal portion and the coil, and the stator and the By preventing damage to the mover and actuator part accommodated in the stator to have improved durability, while providing a shock absorbing structure in the cover to limit the moving distance of the mover to suppress the impact and noise caused by limiting the moving distance of the mover through the cover It is to propose a focal length control module of the lens with improved durability.

The above object is achieved by the following configuration provided in the present invention.

The focal length control module of the lens having improved durability according to the present invention,

A stator having a receiving space; A mover accommodated in the receiving space of the stator; And an actuator part disposed on the inner wall of the stator to generate permanent magnetism, and an actuator part including a coil disposed on the outer wall of the mover facing the stator and receiving an electric current through an extension line to generate an electromagnetic force, and a stopper that is a magnetic body. In the focal length control module of,

The stator has a terminal portion connected to the end of the driving circuit portion, the coil disposed on the mover is connected to the terminal portion through the extension line, the extension line is drawn out of the coil and connected to the terminal portion is formed with an annular winding portion, The extension line is elastically twisted through the winding part during the movement of the mover along the optical axis to exhaust the stress of the extension line according to the change of the distance between the terminal part and the coil.

Preferably, the movable rod is formed so that a fixed rod protrudes, and the fixed rod is configured to be wound around a winding portion of an extension line to fix the position.

More preferably, a cover is provided at an upper portion or a lower portion of the accommodating space formed in the stator, or both thereof, and an elastic layer of elastic material is formed on one surface of the cover facing the mover to move along the optical axis. The impact caused by the interference between the ruler and the cover is configured to be exhausted by the burnt layer.

The stator is configured to include a tubular body of multiple angles, and the inner side of each corner of the tubular body is formed so that the buffer hole penetrates up and down, and the external shock is buffered through the buffer hole formed at each corner.

In addition, a lubricating film made of lubricating oil is formed between the guide and the comb surface of the surface on which the actuators disposed in the accommodating space of the stator are located, so that friction between them is suppressed.

As described above, in the present invention, in the proposal of the focal length adjusting module of the lens to adjust the focal length of the lens through the movement and stop movement of the mover fixed to the lens through the actuator portion, the buffer inside each corner of the stator By forming a ball, the external shock provided to the mover and the actuator portion having the ultra-precision, and the stator accommodating the same are alleviated and exhausted through the buffer hole, thereby improving durability.

And, in the present invention is installed on the upper and lower portions of the open receiving space to form a carbon layer on the cover of the moving distance of the mover through the interference, the impact of the interference with the mover by the expansion and contraction of the finger layer The noise is suppressed, and a lubrication film is formed between the guide and the inclined surface of the surface on which the actuator portion is located to ensure a more stable lubrication state therebetween, and accordingly, the present invention has improved operational stability.

Particularly, in the present invention, a winding portion in which an extension line is wound in an annular shape is formed on an extension line drawn out from the coil and connected to the terminal piece, so that the stress is dissipated and dissipated through the twisting of the winding portion during the movement of the mover.

As a result, stress is concentrated at the end of the coil extension line connected to the terminal portion, and the phenomenon in which the end portion of the extension line is repeatedly bent by the concentration of such stress is prevented from disconnection at the terminal portion, and thus the present invention can have improved durability.

1 is an exploded state diagram showing the overall configuration of the focal length control module of the lens having improved durability proposed as a preferred embodiment in the present invention,
FIG. 2 is an exploded state diagram illustrating an overall configuration in which a plurality of movers of a focal length adjusting module of the lens having improved durability proposed in another embodiment of the present invention are installed.
3 is a view illustrating an operation state of a buffer hole in a focal length control module of an improved lens proposed as a preferred embodiment of the present invention;
4 to 6 is a focal length control module of a lens having improved durability proposed as a preferred embodiment of the present invention, the movement and stop operation state of the mover through the actuator portion, and the winding portion formed according to the coil extension line It shows the state of elastic twisting.

Hereinafter, with reference to the accompanying drawings will be described in detail the focal length control module of the improved lens proposed as a preferred embodiment in the present invention.

1 is an exploded state view showing the overall configuration of the focal length control module of the lens having improved durability proposed as a preferred embodiment in the present invention, Figure 2 is a lens of the improved durability proposed as another embodiment in the present invention 3 is an exploded state diagram showing an overall configuration of a plurality of movers of a focal length adjusting module, and FIG. 3 illustrates an operation state of a buffer hole in a focal length adjusting module of an improved lens proposed as a preferred embodiment of the present invention. 4 to 6 is a focal length control module of the lens having improved durability proposed as a preferred embodiment of the present invention, the movement and stop operation state of the mover through the actuator, and thus the winding formed on the coil extension line It shows the elastic twisting condition of the mounting.

The focal length adjusting module (1, 1) of the lens according to the present invention, the movable operation of the mover 20 is installed along the optical axis (CL) is moved by the actuator 20, the lens 22 is installed through the drive of the actuator 30 It is configured to perform a stop motion that is fixed to a point.

In addition, a focusing function by adjusting a focal length between the image sensor (not shown) and the lens 22 disposed below by moving and stopping the mover 20, or the lens 22 and the lens 22. The zoom function is realized by adjusting the focal length between them.

The focal length adjusting module (1, 1 ') of the lens, as shown in Figure 1 to 2 and the stator 10 is formed with a receiving space 12; One or more movers 20 accommodated in the receiving space 12 of the stator 10; And a thrust for the movement of the mover 20 and a stopping force for the stop operation of the mover 20, disposed between the inner wall of the accommodating space 12 of the stator 10 and the mover 20. It is configured to include an actuator unit 30 for generating and providing.

The stator 10 and the mover 20 are generally composed of a plastic injection molding, and the stator 10 has a tubular body 11 having a polygonal tubular body 11 having a plurality of accommodating spaces 12 which are vertically opened therein. It is configured to include.

And, in the receiving space 12 of the stator 10 and at least one movable body 20, the lens 22 is mounted; The actuator part 30 which generates the thrust and the stopping force for the movement operation | movement and the stop operation | movement of this movable body 20 is each installed so that it may be accommodated.

Here, the thrust generated by the actuator unit 30 means a magnetic flux density coupling force including the attractive force and the repulsive force generated between the permanent magnetic force generated in the permanent magnet and the electromagnetic force generated in the coil, the stop force is a stopper and a magnetic body Metal magnetic coupling force, which is an attractive force generated between permanent magnets generated in permanent magnets.

In addition, in the present embodiment, the buffer hole 11a is formed to penetrate up and down inside each corner of each of the tubular bodies 11 constituting the stator 10 so as to be transmitted from the outside as shown in FIG. 3. ) Is configured to be exhausted by dispersing through the buffer hole (11a) formed in each corner, to have improved impact resistance to the stator 10 and the mover 20 and the actuator portion 30 accommodated in the stator 10 and have.

In addition, plate-shaped covers 13 and 14 having light source holes 13a or focal light source holes 14a are provided at open upper and lower portions of the receiving space 12 formed in the stator 10. Through the shielding action of 13 and 14, light is blocked from reaching the image sensor (not shown) in addition to the light source hole 13a through the other path and reaching the image sensor (not shown). While preventing the contamination caused by foreign matters, the cover 13 and 14 interfere with the mover 20 moving forward or backward along the optical axis CL to limit the moving distance of the mover 20.

In the present embodiment, the cover 13, 14 is made of a stretchable material such as silicon or rubber to form the carbon layer 13b, 14b, or by forming a layer of elastic material on the surface facing the mover. Doing.

Accordingly, the cover 13, 14 is movable in limiting the moving distance of the mover 20 through interference with the mover 20 moving forward or backward along the optical axis CL in the receiving space 12. The impact due to the interference with the ruler 20 is quickly alleviated or exhausted through the expansion and contraction of the carbon layer 13b, 14b.

As such, when the impact due to the interference of the mover 20 is exhausted through the expansion and contraction of the tungsten layers 13b and 14b formed on the covers 13 and 14, the noise due to the interference with the mover 20 is reduced. It can combine operation stability.

Referring to the drawings, the cover (13, 14) is formed to protrude a plurality of indentation projections (13c, 14c) inserted into the buffer hole (11a) formed in the lower edge or the upper edge of the opposing stator (10), The covers 13 and 14 are press-fitted in the indentation protrusions 13c and 14c into the buffer holes 11a of the stator 10, respectively, and are fixed to the upper or lower portion of the stator 10.

At this time, bonding between the indentation protrusions 13c and 14c and the buffer hole 11a through an adhesive (not shown) may form a more stable coupling state between the covers 13 and 14 and the stator 10. It is also possible to further secure the waterproof state by further fusion to the contact surface between them.

In the accommodating space 12 of the stator 10, a movable element 20 composed of a plurality of plate-shaped bodies is installed to be accommodated, and the movable element 12 is provided with a thrust and a stop provided through the actuator part 30. The lens adjusts the focal length of the lens by implementing movement and stop motion respectively.

In the present embodiment, the guide 15 parallel to the optical axis is formed by injection molding on the two side edges in a non-gradient manner on the surface on which the actuator part 30 is installed among the inner wall surface of the accommodation space 12, the guide 15 The edge parallel to the optical axis of the mover 15 is inscribed and supported on the surface.

Accordingly, the mover 20 moves and stops along the optical axis in a state in which two side edges of the surface on which the actuator part 30 is attached are supported by the guide 15 parallel to the optical axis CL. The distortion of the operation process can be suppressed.

According to the present embodiment, the arc-shaped abutment portion of the guide and the corners of the movable member 20 which are circumscribed by the guide are injection-molded to the straight inclined plane 21 parallel to the optical axis, and the movable member 20 is a straight oblique surface. An inner contact with the guide 15 in which the arc-shaped contact portion 15a is formed through 21 is to be accommodated in the accommodation space 12 of the stator 10 in a line contact state.

As shown in the drawing, the receiving space formed in the fixing body is a 'b' shaped body bent at an angle of 70 ° to 130 °, and a guide having an arcuate contact portion 15a having a radius of 0.001 mm to 0.5 mm at the corner ( 15) is arranged.

Therefore, the straight oblique surface of the movable member 20 moves along the optical axis CL or is fixed to one point of the optical axis while forming a linear contact state with the guide 15 having the arcuate contact portion 15a. In addition, the distortion can be suppressed in the stop operation process, and the phenomenon that the thrust for the movement operation is lost due to excessive friction with the inner wall of the accommodation space 12 can be suppressed.

For reference, in the focal length control module of the lens, the optical axis and the central axis of the lens coincide with each other, and the central axis of the lens should be placed at the center point of the image sense so that the occurrence of eccentricity can be suppressed.

For this purpose, the guide of the two axes located on the surface on which the actuator portion is accommodated or on the surface where the metal magnetic coupling force is relatively high in the actuator portion is guided on the opposite side of the actuator portion or on the surface where the metal magnetic coupling force is relatively small, or no guide. By setting the optical axis and the center axis of the lens coincide with each other in the direction of the contrast optical axis, the center axis of the lens is positioned at the IR filter of the lower cover and the image sense position recess groove (not shown), so that the coordinate is fixed to the center point of the image sense. By matching, eccentricity can be suppressed.

In addition, the two-axis guide of the stator and the two-axis inclined plane of the mover of the actuator portion, or the portion of the actuator having the large relative magnetic magnetic coupling force, adhere to the metal magnetic coupling force during the stop operation, and the opposite side or the surface of the relatively small magnetic magnetic coupling force is Since it is separated by an air gap, an eccentric phenomenon can be suppressed by matching an optical axis, a lens center axis, and a center point of an image sense based on the coordinates at which the guide and the inclined surface are attached.

On the other hand, the actuator unit 30 is disposed between the stator 10 and the mover 20 to generate a thrust for the movement of the mover 20, the lens 22 is installed, and a stop force for the stop operation. The permanent magnet 31 is disposed on the inner wall of the receiving space 12 of the stator 10 and generates a permanent magnetic force; A coil 32 disposed on the sidewall of the mover 20 facing the same and generating an electromagnetic force by receiving a current from a driving circuit unit (not shown) through a coil extension line 32a; And a stopper 33 made of a magnetic material that generates a stopping force through the permanent magnetic force generated by the permanent magnets 31 facing and disposed on the mover 20.

Here, the stopper 33 may be formed of a metal piece of magnetic material as in the present embodiment, or may be formed by depositing magnetic powder on the mover as necessary.

In addition, the actuator part 30 is disposed to correspond to each inner wall of each of the stator 10 facing each other and each side of the movable part 20, and provides a thrust required for the movement of one mover through a plurality of actuator parts. You may.

However, in the preferred embodiment of the present invention, the permanent magnet 31 and the coil (on one side of the inner wall of the stator 10 and the movable member 20 facing each other for reducing the weight of the device and the associated cost according to production) 32) and the actuator unit 30 in which the stopper 33 constitutes a pair is disposed, the actuator 20 is provided with thrust through one actuator 30 to move along the optical axis CL, or The position is fixed at one point of the optical axis.

Of course, as shown in FIG. 2, which shows another embodiment, a pair of movers 20 having a lens 22 formed on the stator 10 is disposed between the movers 20 and the movers to achieve a zoom function. When configured to perform the zoom function by adjusting the focal length of the 20, the actuator unit which the permanent magnet 31, the coil 32, and the stopper in a pair between each mover 20 and the stator 10 ( 30 are individually disposed, and are individually disposed between each mover 20 and the stator 10, and each mover 20 is individually moved along the optical axis CL through the individual drive of each actuator unit 30. Moreover, it is comprised so that a position may be fixed to one point of an optical axis.

At this time, the actuator for generating and providing the thrust and the stopping force for the movement and the stop motion of the mover disposed in the lower portion is arranged on one side, and generates the thrust and the stopping force for the movement and stop motion of the mover disposed in the upper portion And it is preferable that the actuator to be provided on the other side, to suppress the magnetic interference between the actuators.

Referring to the drawings, in the present embodiment, the coil 32 and the stopper 33 are disposed on one side of the mover 20 disposed below and the permanent magnet is disposed on one side wall of the receiving space 12 of the stator 10 facing the coil 32 and the stopper 33. A single actuator portion 30 is formed on one side that arranges 31 to provide thrust and stop force to the mover 20 disposed below.

Then, the coil 32 and the stopper 33 are disposed on the other side of the mover 20 disposed above, and the permanent magnet 31 is disposed on the other side wall of the receiving space 12 of the stator 10 facing the coil 32 and the stopper 33. One actuator portion 30 is provided on the other side to provide the thrust and the stopping force to the mover 20 disposed above.

In addition, in the present embodiment, a guide for forming a line contact state between the permanent magnet 31 disposed in the receiving space 12 of the stator 10 and the coil 32 installed on the movable member 20 facing the stator 10. A lubricating film G made of lubricating oil is formed between each of the corners of the movable member 20 formed of the straight inclined surface 21 circumscribed therewith to form a lubricating film G. Doing.

Therefore, when a current is not applied to the coil 32 of the actuator unit 30, as shown in FIG. 4, the mover 20 stops the permanent magnet of the permanent magnet 31 facing through the stopper 33 and stops. It forms a magnetic coupling force of the metal force is fixed to a position of the optical axis (CL).

When a current is applied to the coil 32 of each actuator unit 30 through the driving circuit unit, the coil 32 generates an electromagnetic force, and accordingly, each mover 20 fixing the coil 32 is a coil 32. When the magnetic flux density coupling force, which is the thrust formed between the permanent magnetic force generated in the permanent magnet 31 facing the electromagnetic force generated in the above, is greater than the metal magnetic coupling force, the focal length of the lens 22 moves along the optical axis CL. Will be adjusted.

That is, as shown in FIG. 5A, when the driving circuit unit applies current in the forward direction to the coil 32 disposed on the mover 20, one surface of the coil 32 facing the permanent magnet 31 installed on the inner wall of the stator 10 is provided. Since the electromagnetic force of the N pole is generated, the mover 20 holding the coil 32 moves forward in the S pole direction (upward direction) of the permanent magnet.

On the contrary, as shown in FIG. 6A, when the driving circuit unit applies a reverse current to the coil 32 installed in the mover 20, an S-pole electromagnetic force is generated on one surface of the coil 32 facing the permanent magnet 31. The mover 20 fixed to the coil 32 is gradually moved backward in the N-pole direction (downward direction) of the permanent magnet 31, and the description of the technology and the configuration of the driving circuit portion are similar to those described in the applicant's prior application. It's so cute.

On the other hand, the coil 32 of the actuator unit 30 generates an electromagnetic force by receiving a current from the end 110 of the driving circuit unit through the extension line 32a, in this embodiment the extension line 32a of the coil 32 ) And the terminal portions 16A and 16B connected to the end portion 110 of the driving circuit portion are formed on the stator 10 without directly connecting the end portion 110 of the driving circuit portion. The extension line 32a of the coil 32 arrange | positioned at 20 is connected.

As shown in the drawing, an installation groove 12a for inserting and fixing the terminal portions 16A and 16B is formed in the stator 10 so that the terminal portions 16A and 16B are fixed to the stator 10 through the installation groove 12a. have.

As the terminal portion connecting the end portion 110 of the driving circuit portion and the extension line 32a of the coil 32 to each other and conducting the conductive portion, one or more circuit terminals 16A-a may be formed on the insulating body 16A-b as shown in FIG. 1. Exposed F-PCB or PCB may be employed, or a terminal piece 16B of conductive material may be adopted as shown in FIG. 2.

And, when configuring the terminal portion of the F-PCB or PCB as shown in Figure 1, the number of circuits corresponding to the extension line 32a of the coil 32 on one surface of the insulating body (16A-b) of the F-PCB or PCB By forming the terminals 16A-a, the ends of each extension line 32a drawn out from each coil 32 are soldered with the circuit terminals 16A-a disposed on the single insulating body 16A-b to drive the circuit portion. It is desirable to be in electrical contact with the end 110 of.

In addition, as shown in FIG. 2, when the terminal portion is constituted by the terminal pieces 16B, a plurality of terminal pieces 16B are formed to connect the end portions 102 of the driving circuit portion and the extension lines 32a of the coils 32, respectively. In this case, it is preferable that the end portion 110 of the driving circuit portion be conductive.

On the other hand, if the mover 20 fixed to the coil 32 through the thrust provided from the actuator unit 30 repeatedly moves along the optical axis, the extension line 32a of the coil 32 connected to the terminal piece 16 at this time The stress is concentrated at the ends of the c) and repeatedly bent, and this phenomenon may cause a phenomenon in which the disconnection between the extension line 32a of the coil 32 and the terminal piece 16 occurs.

In particular, the end of the extension line 32a of the coil 32 having a diameter of 0.01 mm to 0.1 mm is connected to the terminal piece 16 fixed to the stator 10 by soldering or the like. At the end of the extension line 32a, the enamel coating is erased, only copper (copper) wire is exposed, and deformation is applied, thereby further increasing the possibility of disconnection.

In order to solve this problem, in this embodiment, the winding part 32b which wound the extension line 32a in an annular shape is formed on the extension line 32a which is pulled out from the said coil 32 and connected to the terminal piece 16. As shown in FIG. .

As shown in the drawing, the winding portion 32b wound around the extension line 32a in a ring shape is wound around a fixed rod 23 formed to protrude from the mover 20, and is always in the correct position by the fixed rod 23. It is fixed.

In this configuration, as shown in FIGS. 5B and 6B, the stress is dispersed and exhausted through the twisting of the winding part 32b during the movement of the mover 20.

Thus, in the focal length adjusting module 1, 1 'of the lens according to the present invention, even if the movable member 20 repeatedly moves the optical axis repeatedly, the extension line 32a of the coil 32 is wound around the winding part 32b. By suppressing the repetitive bending of the end of the extension line 32a connected to the terminal piece 16 through torsion through itself, the end of the extension line 32a of the coil 32 is repeatedly bent to the terminal piece 16. Since disconnection is prevented, it can have improved durability.

The upper end of the extension line 32a of the coil 32 and the stator 10 or the terminal portions 16A and 16B of the extension line 32a of the coil 32 and the soldering positions of the terminal portions 16A and 16B. By bonding the adhesive to the adhesive to prevent disconnection can have a more improved durability.

1. Lens focal length adjustment module.
10. Stator 11. Tubular body
11a. Buffer hole 12. Storage space
12a. Home
13. Cover 13a. Light source
13b. Coal strata 13c. Indentation protrusion
14. Cover 14a. Focus light source
14b. Tangier 14.Indentation
15. Guide 15a. Arc-shaped abutment
16A. PCB or F-PCB 16A-a. Circuit terminal
16A-b. Insulation body 16B. Terminal piece
20. Movable 21. Straight slant
22. Lens 23. Fixing rod
30. Actuator 31. Permanent Magnet
32. Coil 32a. extension
32b. Round winding 33. Stopper
110. End of driving circuit
F. Shock G. Lubrication Film

Claims (6)

A stator having a receiving space; A mover accommodated in the receiving space of the stator; And an actuator part disposed on the inner wall of the stator to generate permanent magnetism, and an actuator part including a coil disposed on the outer wall of the mover facing the stator and receiving an electric current through an extension line to generate an electromagnetic force, and a stopper that is a magnetic body. In the focal length control module of,
The stator has a terminal portion connected to the end of the driving circuit portion, the coil disposed on the mover is connected to the terminal portion through the extension line, the extension line is drawn out of the coil and connected to the terminal portion is formed with an annular winding portion,
The extension line during the process of moving the move along the optical axis, the focal length control module of the lens with improved durability, characterized in that it is configured to dissipate the stress of the extension line according to the change in the distance between the terminal portion and the coil by elastically twisting through the winding portion . 2. The focal length control module of claim 1, wherein a fixed rod is formed to protrude from the movable member, and the fixed rod is configured to be wound around a winding portion of an extension line. According to claim 1, The upper or lower portion of the receiving space formed in the stator, or both, a cover made of an elastic material is provided, the impact due to the interference with the mover moving along the optical axis, the tangy layer Durable lens focal length adjustment module, characterized in that configured to be exhausted through. 2. The shock absorber according to claim 1, wherein a cover having an elastic layer of elastic material is provided on the upper or lower portion of the accommodating space of the stator, or both of the stator layers are impacted by the interference with the mover moving along the optical axis. Durable lens focal length adjustment module, characterized in that configured to be exhausted through. According to claim 1, wherein the stator is configured to include a tubular body of various angles, the focal length adjustment of the lens with improved durability, characterized in that the inner side of each corner of the tubular body, the buffer hole for buffering the external shock is formed to penetrate up and down module. The method according to claim 5, wherein a cover is provided at an upper portion or a lower portion of the tubular body in which the buffer holes are formed inside the corners, and the cover is formed with a press-fitting protrusion inserted into the buffer hole formed in the tubular body.
The cover is a focal length control module of a lens having improved durability, characterized in that the press-fitting projection to the buffer hole formed in the tubular body, it is configured to be fixed to the upper or lower portion of the tubular body.

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