KR20220102502A - Actuator for driving zoom - Google Patents

Abstract

The present invention provides a zoom driving actuator, which comprises: a first carrier including a first mounter on which a first lens assembly is mounted, a first supporting unit on which a first magnet is mounted, and a first guider which is provided on the opposite side of the first supporting unit with respect to the first mounter, and moving in an optical axis direction; a second carrier including a second mounter on which a second lens assembly is mounted, a second supporting unit on which a second magnet is mounted, and a second guider which is provided on the opposite side of the second supporting unit based on the second mounter, and moving in the optical axis direction in an upper part and a lower part of the first carrier; a housing accommodating the first carrier and the second carrier and including a first damper and a second damper inside one side; a first coil unit facing the first magnet; and a second coil unit facing the second magnet. The first carrier includes a third damper facing the first damper and making point contact with the first damper, and a fourth damper facing the second damper and making point contact with the second damper. According to one embodiment of the present invention, the independent movement range of each lens (lens assembly) mounted on each carrier can be sufficiently secured by implementing the physical structure of a plurality of carriers to be symmetrical in directions opposite to each other.

Description

ZOOM DRIVE ACTUATOR {ACTUATOR FOR DRIVING ZOOM}

The present invention relates to a zoom driving actuator, and more particularly, to a zoom driving actuator capable of minimizing the amount of impact and noise that increases when a carrier and a housing come into contact with each other according to an extended moving distance of a lens assembly.

As hardware technology for image processing develops and user needs for image shooting increase, not only independent camera devices, but also camera modules installed in mobile terminals such as mobile phones and smart phones, etc. Functions such as correction (OIS, Optical Image Stabilization) are being implemented.

In addition, recently, an actuator for a zoom lens capable of variously varying the size of a subject by adjusting the focal length through zoom-in and zoom-out functions, etc. has been disclosed, and according to the embodiment, a plurality of actuators are also disclosed. An actuator that implements a zoom function more diversely by applying the mutual positional relationship of lenses (lens assembly) in combination is also disclosed.

In the case of such an actuator for a zoom lens, the movement distance (also referred to as a stroke) of the zoom lens moving in the optical axis direction is extended or extended than that of a general lens, and therefore, it should be designed to secure a driving force corresponding to that amount.

However, in the case of a conventional actuator, a physical structure for driving a carrier is simply implemented in a form in which a plurality of carriers are designed so that an independent movement space of each of a plurality of carriers is secured.

Therefore, in the case of a conventional actuator, since the size of the actuator itself becomes enlarged, it can be said that it is difficult to be applied to an application device such as a smartphone, where size or volume are important issues.

The present invention has been devised to solve the above-mentioned problems in the background as described above, and the purpose of the present invention is to provide a zoom driving actuator capable of more effectively implementing the spatial utilization of the actuator as well as maintaining the driving of each carrier more stably. have.

Another object of the present invention is to provide a zoom driving actuator capable of minimizing noise and impact due to impact when the carrier is moved and the carrier and the housing are in contact with each other.

Other objects and advantages of the present invention may be understood by the following description, and will be more clearly understood by the embodiments of the present invention. In addition, the objects and advantages of the present invention can be realized by the configuration shown in the claims and the combination of the configuration.

In order to achieve the above object, the present invention provides a first mounter on which a first lens assembly is mounted, a first support portion on which a first magnet is mounted, and a first guider provided opposite the first support portion with respect to the first mounter. comprising, a first carrier moving in the optical axis direction, a second mounter on which the second lens assembly is mounted, a second support on which a second magnet is mounted, and a second support on the opposite side of the second mount with respect to the second mounter A housing including a second guider, accommodating a second carrier moving in the optical axis direction from above or below the first carrier, and accommodating the first carrier and the second carrier, the housing including a first damper and a second damper inside one side and a first coil unit facing the first magnet, and a second coil unit facing the second magnet, wherein the first carrier faces the first damper and is in point contact with the first damper. and a fourth damper facing the second damper and making point contact with the second damper.

Here, any one of the first damper and the third damper has a flat front surface, the other one includes a plurality of protrusions on the front surface, and any one of the second damper and the fourth damper has a flat front surface. and the other one may include a plurality of protrusions on the front surface.

In addition, the housing includes a fifth damper and a sixth damper inside the other side, and the second carrier includes a seventh damper facing the fifth damper and point-contacting the fifth damper, and a sixth damper facing the sixth damper. It may include an eighth damper in point contact with the 6 damper.

In addition, any one of the fifth damper and the seventh damper has a flat front surface, the other one includes a plurality of protrusions on the front surface, and any one of the sixth damper and the eighth damper has a flat front surface, , the other one may include a plurality of protrusions on the front surface.

Further, the first carrier includes a ninth damper and a tenth damper opposite the third damper and the fourth damper, respectively, and the second carrier faces the ninth damper and an eleventh damper in point contact with the ninth damper; A twelfth damper facing the tenth damper and in point contact with the tenth damper may be included.

In addition, any one of the ninth damper and the eleventh damper has a flat front surface, the other one includes a plurality of protrusions on the front surface, and any one of the tenth damper and the twelfth damper has a flat front surface. and the other one may include a plurality of protrusions on the front surface.

In addition, the first damper and the second damper may include an elastic member and a fastening member coupled to the elastic member and having both ends fastened to the insertion groove of the housing.

In addition, the third damper and the fourth damper may include an elastic member and a fastening member coupled to the elastic member and having both ends fastened to the insertion groove of the first carrier.

According to an embodiment of the present invention, by implementing the physical structures of the plurality of carriers to be symmetrical in opposite directions to each other, it is possible to sufficiently secure the independent respective movement ranges of each lens (lens assembly) mounted on each carrier. have.

According to an embodiment of the present invention, by improving the physical structure in a form in which a portion of each carrier crosses or overlaps with each other, independent movement of each of a plurality of carriers can be effectively secured, as well as the overall structure of the device and Since the shape can be implemented in a more space-intensive form, it can be further optimized to minimize the overall space and miniaturize the mobile terminal.

According to an embodiment of the present invention, by providing a magnet mounting space to achieve mutual asymmetry for each carrier based on the space in which the lens is mounted, a magnet of sufficient size can be provided in each carrier to further increase the driving force of each carrier. can be effectively augmented.

According to an embodiment of the present invention, by dividing at least two rails of the carrier by forming a partition wall at the center line position of the magnet, the ball is constrained in each of the divided rails so that the carrier can be supported in a balanced manner. . Accordingly, even during long stroke driving, it is possible to prevent the balls from being biased to one side with respect to the center line of the magnet, and it is possible to prevent one side of the carrier from being inclined toward the guide rail and being adsorbed to the housing.

According to an embodiment of the present invention, when the carrier moves, since the respective dampers facing each other are in point contact, the contact area compared to the surface contact is reduced, so that noise and the amount of impact caused by the impact during contact can be minimized.

1 is a view showing the overall configuration of a zoom driving actuator and a camera module according to an embodiment of the present invention.
2 is a diagram illustrating the overall configuration of a zoom driving actuator according to an embodiment of the present invention.
3 to 6 are diagrams illustrating detailed configurations and interrelationships of a first carrier, a second carrier, and a housing of the zoom driving actuator according to an embodiment of the present invention.
7 is a cross-sectional view illustrating a detailed configuration of the present invention.
8 is a view showing the structure of the rail formed on the carrier and the guide rail formed on the housing in the zoom driving actuator according to the embodiment of the present invention.
9 is a view showing a comparative example of a zoom driving actuator according to an embodiment of the present invention, in which the rail of the carrier is continuously formed.
10 is a diagram illustrating a shape in which a rail of a carrier of a zoom driving actuator is divided according to an embodiment of the present invention.
11 is a view showing a comparative example of a zoom driving actuator according to an embodiment of the present invention, and is a view for explaining a driving operation when there is no initial alignment of balls.
12 is a view for explaining an initial alignment operation of a ball in the zoom driving actuator according to an embodiment of the present invention.
13 is a view illustrating a side cross-section of a damper included in a zoom driving actuator according to an embodiment of the present invention.
14 is a front view of a damper included in a zoom driving actuator according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, the terms or words used in the present specification and claims should not be construed as being limited to conventional or dictionary meanings, and the inventor should properly understand the concept of the term in order to best describe his invention. Based on the principle that it can be defined, it should be interpreted as meaning and concept consistent with the technical idea of the present invention.

Therefore, the configuration shown in the embodiments and drawings described in the present specification is merely the most preferred embodiment of the present invention and does not represent all of the technical spirit of the present invention, so at the time of the present application, various It should be understood that there may be equivalents and variations.

1 is a view showing the overall configuration of a zoom driving actuator and a camera module according to an embodiment of the present invention.

Of course, the zoom driving actuator 100 of the present invention may be implemented as a single device by itself, and may also be implemented as a camera module 1000 together with the reflectometer module 200 as shown in FIG. 1 .

The zoom driving actuator 100 of the present invention corresponds to an actuator that implements auto focus (AF) or zoom by linearly moving each of the plurality of carriers on which the lens assembly is mounted in the optical axis direction, as will be described later. .

The reflectometer module 200 may be provided in front or above the zoom driving actuator 100 (based on the optical axis direction), and reflects the light path (Z1) of the subject to the path (Z) in the lens direction. It performs the function of refraction. The light reflected or refracted in the optical axis direction is introduced into an image sensor such as CMOS or CCD through a lens assembly provided in the carrier.

As such, the reflectometer module 200 for changing the path of light may include a reflectometer 210 that may be formed of one selected from a mirror or a prism or a combination thereof. The reflectometer 210 may be implemented by various members that can change the light introduced from the outside in the optical axis direction, but is preferably implemented with a glass material in order to improve optical performance.

The camera module 1000 of the present invention including the reflectometer module 200 and the like is configured to refract the path of light so that the light flows in the lens direction, so the device itself is not installed in the thickness direction of the portable terminal in the longitudinal direction. Since it can be installed, the thickness of the portable terminal is not increased, and thus it can be optimized for miniaturization or slimming of the portable terminal.

Depending on the embodiment, the reflectometer 210 may be configured to be rotated by a driving means for generating a magnetic force such as a magnet or a coil. As such, when the reflectometer 210 moves or rotates, the light of the subject reflected (refracted) through the reflectometer 210 moves in the ±Y direction and/or the ±X direction and is incident on the lens and the imaging device. Correction of the X-axis and/or Y-axis direction by hand shake may be implemented.

The light of the subject reflected through the reflectometer module 200 is incident on the first lens assembly 60 and the second lens assembly 70 provided in the zoom driving actuator 100 , and in this process, the first A function such as zoom or AF is implemented by adjusting the positions (based on the optical axis direction) of the lens assembly 60 and the second lens assembly 70 in combination.

According to the embodiment, in order to improve optical performance such as zoom magnification of the actuator 100, a fixed lens assembly 50 is provided in front of the actuator 100 (based on the optical axis direction) as illustrated in FIG. 1 . may be

Hereinafter, in the description of the present invention, a direction axis corresponding to a path through which light is introduced into the first lens assembly 60 etc. is defined as an optical axis (Z axis), and two axes on a plane perpendicular to the optical axis (Z axis) are defined. It is defined by the X and Y axes.

The fixed lens assembly 50, the first lens assembly 60, and the second lens assembly 70 may consist of one or more lenses or an optical unit and a housing. This unmounted fixed lens assembly 50, first lens assembly 60 and second lens assembly 70 are shown.

2 is a diagram illustrating the overall configuration of a zoom driving actuator according to an embodiment of the present invention.

The zoom driving actuator 100 of the present invention corresponds to the basic frame structure of the actuator 100 and includes a housing 110 accommodating the internal configuration, a case 190 coupled to the housing 110 and capable of functioning as a shield can. ), and a first carrier 120 and a second carrier 130 .

The first carrier 120 on which the first lens assembly 60 is mounted and the second carrier 130 on which the second lens assembly 70 is mounted correspond to a movable body that moves linearly in the optical axis direction (Z-axis direction), respectively. , from a relative point of view corresponding thereto, the housing 110 corresponds to a fixed body.

Referring to FIG. 2 , the second lens assembly 70 is mounted on the second carrier 130 , and the second lens assembly 70 is positioned above or below the first lens assembly 60 with respect to the optical axis direction. It is mounted on the second carrier 130 so that, in this state, the second carrier 130 is linearly moved in the optical axis direction.

As will be described later, a first magnet M1 is provided on the first carrier 120 , and a first coil unit facing the first magnet M1 and providing a driving force to the first magnet M1 is provided on the housing 110 side. (C1) is provided.

When power of an appropriate magnitude and direction is applied to the first coil unit C1 under the control of a first driving driver (not shown), electromagnetic force is generated between the first coil unit C1 and the first magnet M1, and this The first carrier 120 moves forward and backward in the optical axis direction by the generated electromagnetic force. The first coil unit C1 and the like may be provided on the open surface of the housing 110 in the form of being mounted on the first circuit board 170-1.

From a similar point of view, when a second driving driver (not shown) controls so that power of an appropriate size and direction is applied to the second coil unit C2 , the second magnet M2 and the second magnet M2 provided in the second carrier 130 are The second carrier 130 is linearly moved in the optical axis direction by the electromagnetic force generated between the coil units C2. The second coil unit C2 and the like may be provided on the open surface of the housing 110 in the form of being mounted on the second circuit board 170 - 2 .

Although the drawing shows the first carrier 120 on which the first lens assembly 60 is mounted and the second carrier 130 on which the second lens assembly 70 is mounted, this is an example according to the embodiment. Of course, a larger number of lens assemblies and carriers may be provided.

In the following description, two carriers provided in the zoom driving actuator 100 are exemplified for efficiency of explanation, and the carrier located in the upper (front) position relative to the optical axis direction of FIG. 2 is the first carrier 120, and the lower ( A carrier located in the rear) is referred to as a second carrier 130 .

As described above, when the first carrier 120 and the second carrier 130 linearly move in the optical axis direction, respectively, the lens assembly mounted on each carrier also moves linearly in the optical axis direction. A zoom function is implemented.

As described above, the fixed lens assembly 50 may be provided in front of the first lens assembly 60 according to an embodiment to match the optical performance or specifications of the zoom driving actuator 100 .

On the other hand, the first carrier 120 and the second carrier 130, between the first carrier 120 and the housing 110, and the second carrier 130 and the housing (130) to move more flexibly linearly with minimized frictional force. 110) between the balls (B1 to B8, see FIG. 10) is preferably configured to be disposed.

A first magnet (M1) and a second magnet (M2) and an attractive force are generated on the lower surface (YZ plane) of the housing 110 , so that the first carrier 120 and the second carrier 130 are formed by the balls B1 to B8 ) is provided with a yoke 180 made of a metal material that leads to close contact in the direction of the housing 110 with the interposed therebetween.

3 to 6 are diagrams illustrating detailed configurations and interrelationships of a first carrier, a second carrier, and a housing of the zoom driving actuator according to an embodiment of the present invention.

As described above, the first carrier 120 on which the first lens assembly 60 is mounted is a movable body that linearly moves in the optical axis direction, and specifically, the first mounter 121 on which the first lens assembly 60 is mounted. ), and a first support 123 and a first guider 125 on which the first magnet M1 is mounted.

The first mounter 121 is provided with a space corresponding to the shape of the first lens assembly 60 so that the first lens assembly 60 is mounted as illustrated in the drawing, and according to the embodiment, the first lens assembly 60 ) may be provided on the upper portion of the first mounter 121 to prevent the case or stopper (not shown) from being separated in the X-axis direction.

The first support part 123 on which the first magnet M1 is mounted is provided on one side of the left or right side of the first mounter 121, and as shown in the figure, the It has a shape that is longer than the length in the optical axis direction.

The first support 123 may be integrally formed with the first mounter 121 , and in order to implement a physical structure symmetrical with the second support 135 of the second carrier 130 to be described later, the optical axis direction Z axial direction) is preferably configured to have a shape extending in any one direction.

As described above, since the first support part 123 of the present invention is configured to have a shape extending in the optical axis direction, the first magnet M1 having a size corresponding to the expanded area may be mounted, and thus the first carrier 120 ) can further enhance the driving force.

In addition, the first rail 128 facing the first guide rail 111 formed in the housing 110 may be formed on the first support part 123 . In this case, the first ball B1 and the fifth ball B5 are disposed between the first guide rail 111 and the first rail 128 so that a part thereof is accommodated.

The first guider 125 is provided on the opposite side where the first support part 123 is not provided among the left or right sides of the first mounter 121, and has a lower height (X) than the first support part 123 as illustrated in the drawing. axial reference) and may be formed in a bar shape that is longer than the length of the first mounter 121 in the optical axis direction.

A second rail 129 facing the second guide rail 112 formed in the housing 110 is formed on the first guider 125, and the second ball B2 and the sixth ball B6 of the present invention are formed. is disposed between the second guide rail 112 and the second rail 129 so that a part thereof is accommodated.

In this way, the first carrier 120 is positioned on the left and right sides with respect to the first mounter 121, respectively, and includes a first support part 123 and a first support part having a shape extending from the first mounter 121 in the optical axis direction. The movement of the first lens assembly 60 in the optical axis direction may be more stably supported by the first guider 125 .

As described above, the first magnet M1 provided on the first support part 123 of the first carrier 120 generates an attractive force with the yoke 180 provided on the housing 110 .

Therefore, the first carrier 120 of the present invention is in close contact in the direction of the housing 110 while maintaining the overall balance by the attractive force between the first magnet M1 and the yoke 180, the balls (B1, B2, B5, B6) Physical guiding can be implemented more stably.

It is preferable that the first coil unit C1 provided on the side of the housing 110 includes n (a natural number greater than or equal to 2) coils arranged vertically in the optical axis direction to enhance driving force.

The second carrier 130 has a physical structure corresponding to the above-described first carrier 120 , as shown in the drawings, has a structure that is symmetrical to the first carrier 120 in opposite directions.

Specifically, the second carrier 130 includes the second mounter 131 on which the second lens assembly 70 is mounted, the second support 133 on which the second magnet M2 is mounted, and the second guider 135 . include

The second support part 133 of the second carrier 130 is provided on one side of the left or right side of the second mounter 131 , the first support part 123 of the first carrier 120 described above is provided. It is provided in a direction opposite to the direction, has a shape that is longer than the length of the second mounter 131 in the optical axis direction, and is opposite to the direction in which the first support part 123 of the first carrier 120 extends. has an elongated shape.

As such, the first carrier 120 and the second carrier 130 have a similar physical structure as a whole, and the first mounter 121 and the second lens assembly 70 on which the first lens assembly 60 is mounted in the middle portion. ), a sufficient moving distance of the first and second lens assemblies 60 and 70 can be secured by positioning the second mounter 131 on which the mount is mounted.

At the same time, the first magnet M1 for driving the first carrier 120 and the second magnet M2 for driving the second carrier 130 are the first support part 123 and the second support part 133 . Since it can be installed in a relatively larger size through the

Furthermore, the first magnet M1 and the second magnet M2 are spaced apart from each other on the left and right sides (based on the Y-axis), respectively, and the first coil unit C1 and the second magnet facing the first magnet M1 to correspond thereto. The second coil unit C2 facing the second magnet M2 is also spaced apart.

As described above, since the first magnet M1 and the first coil unit C1, the second magnet M2 and the second coil unit C2 are far apart from each other, mutual interference or influence of electromagnetic force for driving each carrier can be minimized, so that independent driving of the first carrier 120 and the second carrier 130 can be more precisely implemented.

A third rail 138 facing the third guide rail 113 formed in the housing 110 may be formed on the second support 133 , and in this case, the third ball B3 and the seventh ball B7 . is disposed between the third guide rail 113 and the third rail 138 so that a part thereof is accommodated.

The second guider 135 is provided on the opposite side where the second support part 133 is not provided among the left or right sides of the second mounter 131, and has a lower height ( X-axis) and may be formed in a bar shape that is longer than the length of the second mounter 131 in the optical axis direction.

A fourth rail 139 facing the fourth guide rail 114 formed in the housing 110 is formed on the second guider 135, and the fourth ball B4 and the eighth ball B8 of the present invention are formed. is disposed between the fourth guide rail 114 and the fourth rail 139 so that a part thereof is accommodated.

As described above, the second carrier 130 is located on the left and right sides with respect to the second mounter 131 and has a second support part 133 having a shape that is longer than that of the second mounter 131 in the optical axis direction and The movement of the second lens assembly 70 in the optical axis direction may be more stably supported by the second guider 135 .

The second magnet M2 provided on the second support part 133 of the second carrier 130 generates an attractive force with the yoke 180 provided on the housing 110 .

Therefore, the second carrier 120 of the present invention is in close contact with the housing 110 while maintaining overall equilibrium by the attractive force between the second magnet M2 and the yoke 180, so that the balls B3, B4, B7, The physical guiding by B8) can be implemented more stably.

3 to 6 , the first carrier 120 has a first space 127 having a path extending in the optical axis direction so that the second guider 135 of the second carrier 130 is movable. includes

Correspondingly, the second carrier 130 includes a second space 137 having a path extending in the optical axis direction so that the first guider 125 of the first carrier 120 is movable.

Through the physical structure of the first space 127 of the first carrier 120 and the second space 137 of the second carrier 130, the first guider 125 of the first carrier 120 is the second The carrier 130 is introduced into the second space 137 , and the second guider 135 of the second carrier 130 is introduced into the first space 127 of the first carrier 120 .

Therefore, the first carrier 120 and the second carrier 130 of the present invention can move independently, as well as some components of each can be implemented as a physical structure in the form of intersecting or stacking each other, so space utilization is improved. can be raised even higher.

7 is a cross-sectional view illustrating a detailed configuration of the present invention, and FIG. 8 is a view showing the structure of a rail formed on a carrier and a guide rail formed on a housing in the zoom driving actuator according to an embodiment of the present invention.

7, the second guider 135 of the second carrier 130 is located in the first space 127 of the first carrier 120, and when the second carrier 130 moves, While receiving physical guiding of the fourth ball (B4) and the eighth ball (B8), it linearly moves in the optical axis direction.

In a corresponding view, the first guider 125 of the first carrier 120 is positioned in the second space 137 of the second carrier 130 , and when the first carrier 120 moves, the second space While receiving the guiding of the second ball (B2) and the sixth ball (B6) through (137), it moves linearly in the optical axis direction.

As described above, since the physical structure is implemented in such a way that a portion of each of the first carrier 120 and the second carrier 130 is stacked or overlapped with each other, independent driving of each is guaranteed and the overall size can be reduced at the same time to further improve spatial utilization. can be raised

In order to further increase the efficiency of this spatial design, the first space 127 is formed between the first mounter 121 and the first support part 123 , and the second space 137 is formed between the second mounter 131 and the second mounter 131 . It is preferable to be formed between the two support parts 133 .

As shown in FIG. 8 , first to fourth guide rails 111 , 112 , 113 , and 114 are formed on the bottom surface (based on the X-axis) of the housing 110 .

The first guide rail 111 and the second guide rail 112 are configured for guiding the balls B1, B2, B5, and B6 positioned between the first carrier 120 and the housing 110, One guide rail 111 faces the first rail 128 , and the second guide rail 112 faces the second rail 129 .

The third guide rail 113 faces the third rail 138 formed on the second support 133 of the second carrier 130 , and the fourth guide rail 114 is the second of the second carrier 130 . 2 faces the fourth rail 139 formed on the guider 135 .

As described above, in each of the first carrier 120 and the second carrier 130 of the present invention, the part on which the lens is mounted and the part on which the driving magnet is mounted are dualized, and the part on which the magnet is mounted extends in the optical axis direction. shape, and the first carrier 120 and the second carrier 130 themselves are configured to have a symmetrical physical structure based on different directions.

Therefore, as described above, the structure for the guide rail can be further extended in the optical axis direction, and based on this, the movement distance in the optical axis direction of the first carrier 120 and the second carrier 130 can be further increased without interference or physical interference due to movement. can be effectively expanded.

In order to implement effective guiding for linearity, the balls B1 to B8 are partially accommodated in one or more of the rails 128, 129, 138, 139 and/or the guide rails 111, 112, 113, and 114. It is preferable to be provided with

9 is a view showing a comparative example of a zoom driving actuator according to an embodiment of the present invention, in which the rail of the carrier is continuously formed, and FIG. 10 is the rail of the carrier of the zoom driving actuator according to the embodiment of the present invention. It is a drawing showing a partitioned shape.

Referring to FIG. 9 , when the first rail 128 of the first carrier 120 is continuously formed, when a long stroke is driven, the first carrier 120 moves to the guide rails 111 and 112 . In the process of moving along , the balls B1 , B2 , B5 , and B6 may be arranged to be biased to one side with respect to the center line MCL of the first magnet M1 .

At this time, in the first carrier 120 , the portion where the balls B1 , B2 , B5 , and B6 are not located is inclined toward the first guide rail 111 and is adsorbed to the housing 110 , the first carrier 120 . ), there is a problem that prevents the movement of

In order to prevent such a problem, the zoom driving actuator 100 according to the embodiment of the present invention divides at least two rails 128 , 129 , 138 , 139 of the carriers 120 , 130 , and the balls B1 ~B8) is prevented from being biased to one side with respect to the center line MCL of the magnets M1 and M2.

Specifically, referring to FIG. 10 , the first rail 128 formed on the first support portion 123 of the first carrier 120 faces the first guide rail 111 formed on the housing 110 , The first partition wall 128a is formed at a position of the center line MCL of the one magnet M1 and divided into at least two partitions.

Here, the first ball B1 and the fifth ball B5 are respectively disposed between the first guide rail 111 and the first rail 128 partitioned into at least two.

In addition, the second rail 129 formed on the first guider 125 of the first carrier 120 faces the second guide rail 112 formed on the housing 110 and faces the first partition wall 128a. The second partition wall 129a is formed at a position where it is divided into at least two partitions.

Here, the second ball B2 and the sixth ball B6 are disposed between the second guide rail 112 and the second rail 129 partitioned into at least two, respectively.

In addition, the third rail 138 formed on the second support 133 of the second carrier 130 faces the third guide rail 113 formed on the housing 110 , and the center line of the second magnet M2 . The third partition wall 138a is formed at the (MCL) position and divided into at least two partitions.

Here, the third ball B3 and the seventh ball B7 are respectively disposed between the third guide rail 113 and the third rail 138 divided into at least two.

In addition, the fourth rail 139 formed on the second guider 135 of the second carrier 130 faces the fourth guide rail 114 formed on the housing 110 and faces the third partition wall 138a. A fourth partition wall 139a is formed at a position where it is divided into at least two.

Here, a fourth ball (B4) and an eighth ball (B8) are respectively disposed between the fourth guide rail (114) and the fourth rail (139) divided into at least two.

In this way, the zoom driving actuator 100 according to the embodiment of the present invention forms the partition walls 128a, 129a, 138a, 139a at the center line MCL of the magnets M1 and M2 to form the rails 128, 129, By dividing at least two or more 138 and 139, the balls B1 to B8 are restrained in each of the divided rails 128, 129, 138, 139, so that the carriers 120 and 130 can be supported in a balanced way. . Accordingly, even during long stroke driving, it is possible to prevent the balls B1 to B8 from being arranged biased to one side with respect to the center line MCL of the magnets M1 and M2, and one side of the carriers 120 and 130 is It is possible to prevent adsorption to the housing 110 by inclining toward the guide rails 111 to 114 .

11 is a view showing a comparative example of a zoom driving actuator according to an embodiment of the present invention, and is a view for explaining a driving operation when there is no initial alignment of balls, and FIG. 12 is a zoom driving according to an embodiment of the present invention. It is a diagram for explaining the initial alignment operation of the ball in the actuator.

Referring to FIG. 11 , according to the use state, at least one of the balls B1 , B2 , B5 , B6 for moving the first carrier 120 is in a direction opposite to the moving direction of the first carrier 120 . It may come into contact with the end of the first rail 128 positioned. In this state, when the first carrier 120 moves in the moving direction along the first guide rail 111 , the ball in contact with the end of the first rail 128 performs a drag motion rather than a rolling motion, so that the first There is a problem that the carrier 120 cannot be moved smoothly.

In order to prevent such a problem, the zoom driving actuator 100 according to an embodiment of the present invention performs an initial alignment operation of the ball when the actuator is driven.

Specifically, by moving the first carrier 120 and the second carrier 130 to the origin during initial driving, the positions of the balls B1 to B8 are set in the moving direction of the first carrier 120 and the second carrier 130 . The first to fourth rails (128, 129, 138, 139) positioned at the ends are aligned.

For example, referring to FIG. 12 , when the first carrier 120 is initially driven, the first carrier 120 is moved to the origin in the opposite direction to the moving direction, and the positions of the balls B1, B2, B5, and B6 are changed to the first carrier 120. Align with the ends of the first and second rails (128, 129) located in the moving direction of the. In this state, when the first carrier 120 moves in the moving direction along the guide rails 111 and 112 , the ball in contact with the end of the first rail 128 performs a rolling motion rather than a dragging motion. It is possible to move the carrier 120 smoothly.

Here, the origin of the first carrier 120 and the second carrier 130 may be preset and stored.

On the other hand, the zoom driving actuator 100 according to the embodiment of the present invention increases the amount of impact and noise when the carriers 120 and 130 and the housing 110 come into contact with each other according to the extended movement distance of the lens assemblies 60 and 70 . There is a problem.

In order to prevent such a problem, the zoom driving actuator 100 according to an embodiment of the present invention, when the housing 110 and the first carrier 120 are in contact, the first carrier 120 and the second carrier 130 . ) includes a damper to alleviate the impact and reduce noise when in contact between the second carrier 130 and the housing 110 or in contact between the second carrier 130 and the housing 110 .

Specifically, referring to FIGS. 3 to 6 , the housing 110 includes a first damper 160a and a second damper 160b inside one side, and a fifth damper 160e and a sixth damper 160e inside the other side. and a damper 160f.

In addition, the first carrier 120 includes a third damper 160c facing the first damper 160a and a fourth damper 160d facing the second damper 160b. The second carrier 130 includes a seventh damper 160g facing the fifth damper 160e and an eighth damper 160h facing the sixth damper 160f.

In addition, the first carrier 120 includes a ninth damper 160i and a tenth damper 160j opposite the third damper 160c and the fourth damper 160d, respectively, and the second carrier 130 is , an eleventh damper 160k facing the ninth damper 160i and a twelfth damper 160m facing the tenth damper 160j.

Here, the zoom driving actuator 100 according to the embodiment of the present invention is characterized in that each damper facing each other is in point contact.

Specifically, any one of the first damper 160a and the third damper 160c has a flat front surface, the other one includes a plurality of protrusions on the front surface, and the second damper 160b and the fourth damper 160c Any one of (160d) has a flat front surface, and the other one includes a plurality of protrusions on the front surface.

In addition, any one of the fifth damper 160e and the seventh damper 160g has a flat front surface, and the other one includes a plurality of protrusions on the front surface, and the sixth damper 160f and the eighth damper (160g) ( 160h) has a flat front surface, and the other one includes a plurality of protrusions on the front surface.

In addition, any one of the ninth damper 160i and the eleventh damper 160k has a flat front surface, and the other one includes a plurality of protrusions on the front surface, and the tenth damper 160j and the twelfth damper (160j) 160m) has a flat front surface, and the other includes a plurality of protrusions on the front surface.

13 is a view showing a side cross-section of a damper included in a zoom driving actuator according to an embodiment of the present invention, and FIG. 14 is a front view of a damper included in a zoom driving actuator according to an embodiment of the present invention. .

Specifically, referring to FIGS. 13 and 14 , the first damper 160a provided inside one side of the housing 110 of the present invention includes an elastic member 161a made of a rubber material, etc., and an elastic member 161a and and a fastening member 162a coupled thereto. Here, the fastening member 162a is made of a bendable metal material, etc., and penetrates the elastic member 161a and may be coupled to the elastic member 161a in a state in which both ends thereof are exposed up and down.

In addition, insertion grooves 110a and 110b into which both ends of the fastening member 162a can be inserted are formed inside one side of the housing 110, and both ends of the fastening member 162a are bent in a state of insertion grooves 110a and 110b. can be contracted to Accordingly, in a state in which the front surface of the elastic member 161a is exposed to the outside, it may be fixed inside one side of the housing 110 .

Similarly, the third damper 160c provided on the outside of the first carrier 120 and facing the first damper 160a is coupled to the elastic member 161c made of a rubber material or the like, and the elastic member 161c is coupled to it. member 162c. Here, the fastening member 162c is made of a bendable metal material, etc., penetrates the elastic member 161c and may be coupled to the elastic member 161c with both ends thereof exposed up and down.

In addition, insertion grooves 120a and 120b into which both ends of the fastening member 162c can be inserted are formed on the outside of the first carrier 120 , and both ends of the fastening member 162c are bent while the insertion grooves 120a and 120b are bent. ) can be entered into. Accordingly, in a state in which the front surface of the elastic member 161c is exposed to the outside, it may be fixed to the outside of the first carrier 120 .

Here, the front surface of the first damper 160a may have a planar shape, and the third damper 160c facing the first damper 160a may include a plurality of protrusions 163c on the front surface. In addition, the end of the protrusion 160c may have a convex shape, but is not limited thereto, and any shape capable of making point contact with the first damper 160a is sufficient. In addition, although the plurality of protrusions 163c are arranged side by side in a vertical direction in the drawings, the present invention is not limited thereto, and may be arranged side by side or irregularly in a horizontal direction or in both vertical and horizontal directions.

Of course, on the contrary, the front surface of the third damper 160c may have a planar shape, and the first damper 160a facing the third damper 160c may include a plurality of protrusions 163c on the front surface.

On the other hand, although the plurality of protrusions 163c may be formed in both the first damper 160a and the third damper 160c, the point contact between the first damper 160a and the third damper 160c may occur due to a process error. It is not recommended because there is a fear that it will not happen.

In the same manner as described above, each of the dampers facing each other may be fastened to the respective carriers 120 and 130 or the housing 110 to be in point contact with each other.

As described above, in the zoom driving actuator 100 according to the embodiment of the present invention, when the first carrier 120 and the second carrier 130 move, each damper facing each other makes point contact, so the contact area compared to the surface contact. As this is reduced, it is possible to minimize the noise and the amount of impact caused by the impact upon contact. That is, in the above-described example, during the contact process between the first damper 160a and the third damper 160c, the protrusion 163c provided in the third damper 160c is deformed due to its elastic force and gradually absorbs the amount of impact. and, through this, it is possible to minimize the noise and the amount of impact caused by the impact.

In the above, although the present invention has been described with reference to limited embodiments and drawings, the present invention is not limited thereto and will be described below with the technical idea of the present invention by those of ordinary skill in the art to which the present invention pertains. Of course, various modifications and variations are possible within the scope of equivalents of the claims.

In the above description of the present invention, modifiers such as first and second are only instrumental terms used to relatively distinguish between components, so they are used to indicate a specific order, priority, etc. It should not be construed as a term that

The accompanying drawings for the purpose of explaining the present invention and illustrating examples thereof may be shown in a somewhat exaggerated form in order to emphasize or highlight the technical contents of the present invention, but the above-described contents and matters shown in the drawings, etc. It should be construed as apparent that various types of modification application examples may be possible at the level of those skilled in the art in consideration of this.

1000: camera module
50: fixed lens assembly 60: first lens assembly
70: second lens assembly 200: reflectometer module
100: actuator
110: housing 111 (112, 113, 114): guide rail
C1: first coil part C2: second coil part
120: first carrier 121: first mounter
123: first support 125: first guider
128: first rail 129: second rail
M1: first magnet
130: second carrier 131: second mounter
133: second support 135: second guider
138: third rail 139: fourth rail
160: damper
M2: first magnet
180: yoke 190: case

Claims (8)

A first mounter on which the first lens assembly is mounted, a first support portion on which the first magnet is mounted, and a first guider provided on the opposite side of the first support portion with respect to the first mounter, moving in the optical axis direction a first carrier;
a second mounter on which a second lens assembly is mounted, a second support portion on which a second magnet is mounted, and a second guider provided opposite the second support portion with respect to the second mounter, the upper portion of the first carrier Or a second carrier moving in the optical axis direction from the bottom;
a housing accommodating the first carrier and the second carrier, the housing including a first damper and a second damper inside one side;
a first coil unit facing the first magnet; and
and a second coil unit facing the second magnet,
The first carrier,
a third damper facing the first damper and in point contact with the first damper, and a fourth damper facing the second damper and point contacting the second damper
Zoom drive actuator.
The method of claim 1,
One of the first damper and the third damper has a flat front surface, and the other includes a plurality of protrusions on the front surface,
Any one of the second damper and the fourth damper has a flat front surface, and the other one includes a plurality of protrusions on the front surface.
Zoom drive actuator.
The method of claim 1,
The housing is
It includes a fifth damper and a sixth damper inside the other side,
The second carrier,
a seventh damper facing the fifth damper and in point contact with the fifth damper; and an eighth damper facing the sixth damper and point contacting the sixth damper;
Zoom drive actuator.
4. The method of claim 3,
Any one of the fifth damper and the seventh damper has a flat front surface, and the other one includes a plurality of protrusions on the front surface,
Any one of the sixth damper and the eighth damper has a flat front surface, and the other one includes a plurality of protrusions on the front surface.
Zoom drive actuator.
The method of claim 1,
The first carrier,
a ninth damper and a tenth damper opposite the third damper and the fourth damper, respectively;
The second carrier,
an eleventh damper facing the ninth damper and point-contacting the ninth damper, and a twelfth damper facing the tenth damper and point-contacting the tenth damper;
Zoom drive actuator.
6. The method of claim 5,
Any one of the ninth damper and the eleventh damper has a flat front surface, and the other includes a plurality of protrusions on the front surface,
One of the tenth damper and the twelfth damper has a flat front surface, and the other one includes a plurality of protrusions on the front surface.
Zoom drive actuator.
The method of claim 1,
The first damper and the second damper,
elastic member; and
and a fastening member coupled to the elastic member and having both ends fastened to the insertion groove of the housing.
Zoom drive actuator.
The method of claim 1,
the third damper and the fourth damper,
elastic member; and
It is coupled to the elastic member, both ends comprising a fastening member fastened to the insertion groove of the first carrier
Zoom drive actuator.

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