KR102467587B1 - Actuator for driving zoom - Google Patents

Abstract

The present invention includes a first mounter on which a first lens assembly is mounted, a first support on which a first magnet is mounted, and a first guider provided on the opposite side of the first support with respect to the first mounter, in the optical axis direction A moving first carrier, a second mounter on which a second lens assembly is mounted, a second supporter on which a second magnet is mounted, and a second guider provided on the opposite side of the second supporter based on the second mounter, A second carrier moving in the optical axis direction above or below the first carrier, a housing accommodating the first carrier and the second carrier, a first coil unit facing the first magnet, and a second carrier facing the second magnet. It includes two coil parts, the first support part faces the first guide rail formed in the housing, and includes a first rail divided into at least two parts by forming a first barrier rib at a center line position of the first magnet, The guider provides a zoom driving actuator including a second rail that faces the second guide rail formed in the housing and is divided into at least two parts by forming a second partition wall at a position opposite to the first partition wall.

Description

Zoom driving actuator {ACTUATOR FOR DRIVING ZOOM}

The present invention relates to a zoom driving actuator, and more particularly, to a zoom driving actuator capable of more stably improving driving performance according to an extended movement distance of a lens.

As hardware technology for image processing develops and user needs for image shooting increase, auto focus (AF), hand shake, etc. Functions such as optical image stabilization (OIS) are being implemented.

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

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

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

Therefore, in the case of a conventional actuator, since the size of the actuator itself becomes large, it can be said that it is difficult to apply to application devices such as smart phones in which size or volume is an important issue.

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 drive actuator that can more effectively implement the spatial utilization of the actuator as well as maintaining the drive of each carrier more stably. have.

In addition, the present invention can prevent the balls from being biased to one side with respect to the center line of the magnet even during long stroke driving, and prevent one side of the carrier from tilting toward the guide rail and being absorbed into the housing. Its purpose is to provide a driving actuator.

Other objects and advantages of the present invention can 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 on which a first magnet is mounted, and a first guider provided on the opposite side of the first support with respect to the first mounter Including, a first carrier moving in the optical axis direction, a second mounter on which the second lens assembly is mounted, a second supporter on which the second magnet is mounted, and a second mounter provided on the opposite side of the second supporter A second carrier including a second guider and moving in an optical axis direction from above or below the first carrier, a housing accommodating the first carrier and the second carrier, a first coil unit facing the first magnet, It includes a second coil part facing the second magnet, the first support part faces the first guide rail formed in the housing, and the first partition wall is formed at the center line position of the first magnet to divide the first part into at least two parts. A zoom drive actuator including a rail, the first guider facing the second guide rail formed in the housing, and including a second rail divided into at least two parts by forming a second partition wall at a position opposite to the first partition wall. to provide.

In addition, the zoom driving actuator of the present invention may further include balls disposed between the first guide rail and the first rail divided into at least two parts, and between the second guide rail and the second rail divided into at least two parts, respectively. have.

In addition, the second support part faces the third guide rail formed in the housing, and includes a third rail partitioned into at least two parts by forming a third barrier rib at the center line position of the second magnet, and the second guider is attached to the housing It faces the formed fourth guide rail and may include a fourth rail partitioned into at least two parts by forming a fourth partition wall at a position facing the third partition wall.

In addition, the zoom driving actuator of the present invention may further include balls disposed between the third guide rail and the third rail divided into at least two parts, and between the fourth guide rail and the fourth rail divided into at least two parts, respectively. have.

In addition, the first carrier may include a first space forming a passage through which the second guider is movable, and the second carrier may include a second space forming a passage through which the first guider is movable.

Here, the first space may be formed between the first mounter and the first support part, and the second space may be formed between the second mounter and the second support part.

In addition, the first support part and the first guider may have a shape extending from the first mounter based on the optical axis direction, and the first guider may have a height lower than that of the first support part.

In addition, the second support part and the second guider have a shape extending from the second mounter based on the optical axis direction, and have a shape extending in a direction opposite to the extending direction of the first support part and the first guider, and the second guider may have a height lower than that of the second support.

In addition, the zoom actuator according to the present invention may further include a yoke provided on the housing and generating an attractive force with the first magnet and the second magnet.

In addition, the zoom drive actuator of the present invention moves the first carrier and the second carrier to the origin during initial driving, so that the position of the ball is moved to the ends of the first to fourth rails located in the moving direction of the first carrier and the second carrier. can be sorted

According to an embodiment of the present invention, by implementing the physical structure of a plurality of carriers to be symmetrical in directions opposite to each other, the independent movement range of each lens (lens assembly) mounted on each carrier can be sufficiently secured. have.

According to an embodiment of the present invention, by improving the physical structure in a form in which a part of each carrier crosses or overlaps with each other, it is possible to effectively secure independent movement of each of a plurality of carriers, as well as to improve the overall structure and Since the shape can be implemented in a more space-intensive form, it can be further optimized for minimization of the overall space and miniaturization of the mobile terminal through this.

According to an embodiment of the present invention, by providing a magnet mounting space so that each carrier is asymmetric with respect to the space in which the lens is mounted, a magnet of sufficient size can be provided in each carrier, further increasing the driving force of each carrier. can be effectively augmented.

According to an embodiment of the present invention, by forming a barrier rib at the center line of the magnet to partition at least two or more rails of the carrier, the balls are constrained within each partitioned rail to support the carrier in a balanced manner. . Accordingly, even during long stroke driving, it is possible to prevent the balls from being skewed to one side with respect to the center line of the magnet, and preventing one side of the carrier from tilting toward the guide rail and being attracted to the housing.

1 is a diagram 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 showing 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 a zoom actuator according to an embodiment of the present invention.
7 is a cross-sectional view illustrating the detailed configuration of the present invention.
8 is a view showing structures of a rail formed in a carrier and a guide rail formed in a housing in a zoom driving actuator according to an 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 rails of a carrier are continuously formed.
10 is a diagram illustrating a divided shape of rails of a carrier of a zoom driving actuator according to an embodiment of the present invention.
11 is a diagram showing a comparative example of a zoom driving actuator according to an embodiment of the present invention, and is a diagram for explaining a driving operation when there is no initial alignment of balls.
12 is a diagram for explaining an initial alignment operation of balls 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 this specification and claims should not be construed as being limited to the usual or dictionary meaning, and the inventor appropriately uses the concept of the term in order to explain his/her invention in the best way. It should be interpreted as a meaning and concept consistent with the technical idea of the present invention based on the principle that it can be defined.

Therefore, since the embodiments described in this specification and the configurations shown in the drawings are only one of the most preferred embodiments of the present invention and do not represent all of the technical ideas of the present invention, various alternatives may be used at the time of this application. It should be understood that there may be equivalents and variations.

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

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

As will be described later, 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 a plurality of carriers equipped with a lens assembly in the direction of an optical axis. .

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

In this way, the reflectometer module 200 that changes the path of light may include a reflectometer 210 that may be formed of a selected one or a combination of mirrors and prisms. The reflector 210 may be implemented by various members capable of changing light introduced from the outside in the direction of an optical axis, but it is preferable to implement a glass material in order to improve optical performance.

The camera module 1000 of the present invention, which includes the reflectometer module 200 and the like, refracts the path of light so that the light flows in the direction of the lens, so that the device itself is not installed in the thickness direction of the mobile terminal, but in the longitudinal direction. Since it can be installed, it can be optimized for miniaturization or slimming of the portable terminal without increasing the thickness of the portable terminal.

Depending on the embodiment, the reflector 210 may be configured to be rotated and moved by a driving means that generates magnetic force, such as a magnet and a coil. When the reflectometer 210 moves or rotates in this way, the light of the subject reflected (refracted) through the reflectometer 210 moves in the ±Y direction and/or ±X direction and enters the lens and the imaging device. Correction of X-axis and/or Y-axis directions due to hand shake may be implemented.

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

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

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

The fixed lens assembly 50, the first lens assembly 60, and the second lens assembly 70 may be composed of one or more lenses or optical units and a housing, but in the drawings, the internal configuration is more clearly expressed, such as a lens, etc. The unmounted fixed lens assembly 50, first lens assembly 60 and second lens assembly 70 are shown.

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

The zoom drive actuator 100 of the present invention includes a housing 110 corresponding to the basic frame structure of the actuator 100 and accommodating internal components, and a case 190 coupled to the housing 110 and functioning as a shield can. ), the first carrier 120 and the second carrier 130 are included.

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 moving bodies that move linearly in the optical axis direction (Z-axis direction), respectively. , the housing 110 corresponds to a fixed body in a relative perspective corresponding to this.

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 based on the optical axis direction. In this state, the second carrier 130 linearly moves in the optical axis direction.

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

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

From a similar point of view, when a second driving driver (not shown) controls power to be applied to the second coil unit C2 in an appropriate size and direction, the second magnet M2 provided in the second carrier 130 and the second The second carrier 130 linearly moves in the optical axis direction by the electromagnetic force generated between the coil parts C2. The second coil part C2 and the like may be provided on the open surface of the housing 110 in a form 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 one embodiment and according to the embodiment Of course, a greater number of lens assemblies and carriers may be provided.

In the following description, for efficiency of description, two carriers are exemplified in the zoom actuator 100, and the carrier located at the top (front) with respect to the optical axis direction of FIG. 2 is the first carrier 120, and the bottom ( The carrier located at the rear) is referred to as the second carrier 130 .

In this way, when the first carrier 120 and the second carrier 130 are each linearly moved in the optical axis direction, the lens assembly mounted on each carrier is also linearly moved in the optical axis direction, and the relative positional relationship of these lenses determines whether the AF or 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 embodiments to meet the optical performance or specifications of the zoom actuator 100 .

On the other hand, between the first carrier 120 and the housing 110 and between the second carrier 130 and the housing so that the first carrier 120 and the second carrier 130 can more flexibly move linearly with minimized friction 110) between the balls (B1 ~ B8, see Fig. 10) is preferably configured to be disposed.

On the lower surface (YZ plane) of the housing 110, the first magnet M1 and the second magnet M2 generate an attractive force, so that the first carrier 120 and the second carrier 130 move the balls B1 to B8. ) is provided with a yoke 180 made of metal that guides the housing 110 to come into close contact 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 a zoom 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 moving body that moves linearly in the optical axis direction, and specifically, the first mounter 121 on which the first lens assembly 60 is mounted. ), a first support part 123 on which the first magnet M1 is mounted, and a first guider 125.

As illustrated in the drawing, 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 therein, and according to the embodiment, the first lens assembly 60 ) may be provided on the upper part of the first mounter 121 to prevent deviation in the X-axis direction, etc., or a stopper (not shown).

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

The first support part 123 may be integrally formed with the first mounter 121, and in order to realize a physical structure mutually symmetrical with the second support part 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 extended in the optical axis direction, the first magnet M1 having a size corresponding to the extended area can be mounted thereon, so that the first carrier 120 ) can further enhance the driving force.

In addition, a first rail 128 facing the first guide rail 111 formed on 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 in such a way that a portion thereof is accommodated.

The first guider 125 is provided on the opposite side of the left or right side of the first mounter 121 where the first support part 123 is not provided, and as illustrated in the drawing, the height lower than the first support part 123 (X axis) and may be formed in a bar shape extending 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 on the housing 110 is formed on the first guider 125, and the second ball B2 and the sixth ball B6 of the present invention is disposed between the second guide rail 112 and the second rail 129 in a form in which a part thereof is accommodated.

In this way, the first carrier 120 is located on the left and right sides of the first mounter 121 and has a shape extending from the first mounter 121 based on the optical axis direction, and the first support part 123 and Movement of the first lens assembly 60 in the optical axis direction can be more stably supported by the 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, since the first carrier 120 of the present invention maintains equilibrium as a whole by the attractive force between the first magnet M1 and the yoke 180 and adheres to the direction of the housing 110, the balls B1, B2, B5, and B6 Physical guiding by can be implemented more stably.

The first coil unit C1 provided on the side of the housing 110 is preferably composed of n (a natural number of 2 or more) coils arranged vertically in the optical axis direction to increase driving force.

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

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, and the first support part 123 of the first carrier 120 described above is provided. It is provided in a direction opposite to the direction, and has a shape extending longer than the length of the second mounter 131 in the direction of the optical axis, but in a direction opposite to the direction in which the first support part 123 of the first carrier 120 extends. has an elongated shape.

In this way, 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. Sufficient movement distances of the first and second lens assemblies 60 and 70 can be secured by positioning the second mounter 131 on which ) 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 connected to the first support part 123 and the second support part 133. Since it can be installed in a relatively larger size through, it is possible to effectively increase the driving force.

Furthermore, the first magnet M1 and the second magnet M2 are spaced apart from each other on the left and right sides (Y-axis reference), respectively, and the first coil unit C1 facing the first magnet M1 and the second magnet M1 are spaced apart from each other. The second coil part C2 facing the 2 magnets M2 is also spaced apart.

As described above, since the first magnet M1 and the first coil part C1 and the second magnet M2 and the second coil part C2 are spaced apart from each other at a long distance, mutual interference or influence of the electromagnetic force for driving each carrier Since it is possible to minimize the independent driving of the first carrier 120 and the second carrier 130 can be implemented more precisely.

A third rail 138 facing the third guide rail 113 formed in the housing 110 may be formed in the second support part 133, 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 in a form in which a portion thereof is accommodated.

The second guider 135 is provided on the opposite side of the left or right side of the second mounter 131 where the second support part 133 is not provided, and as illustrated in the drawing, a height lower than the second support part 133 ( X axis) and may be formed in a bar shape extending 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 on the housing 110 is formed on the second guider 135, and the fourth ball B4 and the eighth ball B8 of the present invention is disposed between the fourth guide rail 114 and the fourth rail 139 in such a way that a portion thereof is accommodated.

In this way, the second carrier 130 is located on the left and right sides of the second mounter 131 and has a shape extending from the second mounter 131 in the optical axis direction, and the second support part 133 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 maintains balance as a whole by the attractive force between the second magnet M2 and the yoke 180 and adheres to the direction of the housing 110, so that the balls B3, B4, B7, Physical guiding by B8) can be implemented more stably.

3 to 6, the first carrier 120 has a first space 127 having a passage extending in the optical axis direction so that the second guider 135 of the second carrier 130 can move includes

Correspondingly, the second carrier 130 includes a second space 137 having a passage 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 It flows into the second space 137 of the carrier 130, and the second guider 135 of the second carrier 130 flows 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, and each part can be implemented as a physical structure in the form of mutually crossing or stacking, thereby improving space utilization. can be raised further.

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

As shown in FIG. 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, It linearly moves in the direction of the optical axis while receiving the physical guiding of the fourth ball B4 and the eighth ball B8.

From a corresponding point of view, the first guider 125 of the first carrier 120 is located in the second space 137 of the second carrier 130, and when the first carrier 120 moves, the second space While being guided by the second ball B2 and the sixth ball B6 through 137, it linearly moves in the direction of the optical axis.

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

In order to further increase the efficiency of such 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 first support part 123. 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 (X-axis reference) of the housing 110 .

The first guide rail 111 and the second guide rail 112 are configured to guide the balls B1, B2, B5, and B6 located 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 carrier 130. It faces the fourth rail 139 formed on the two guiders 135.

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

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

A form in which a part of the balls B1 to B8 is accommodated in one or more of the rails 128, 129, 138, and 139 or/and the guide rails 111, 112, 113, and 114 so that effective guiding for linearity is implemented. It is preferable to be provided with.

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

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

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

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

Specifically, referring to FIG. 10, the first rail 128 formed on the first support part 123 of the first carrier 120 faces the first guide rail 111 formed on the housing 110, and A first barrier rib 128a is formed at a position of the center line MCL of one magnet M1 to divide it into at least two parts.

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

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. A second barrier rib 129a is formed at the location to divide it into at least two.

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

In addition, the third rail 138 formed on the second support part 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. A third partition wall 138a is formed at the (MCL) position and divided into at least two.

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 parts.

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 barrier rib 139a is formed at the location to divide it into at least two.

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

As described above, the zoom driving actuator 100 according to an embodiment of the present invention forms the partition walls 128a, 129a, 138a, and 139a at the center line MCL position of the magnets M1 and M2 to move the rails 128, 129, 138 and 139 are partitioned into at least two, so that the balls B1 to B8 are restrained within the partitioned rails 128, 129, 138, and 139 to support the carriers 120 and 130 in a balanced manner. . Accordingly, even when the long stroke is driven, it is possible to prevent the balls (B1 to B8) from being skewed to one side with respect to the center line (MCL) of the magnets (M1, M2), and one side of the carriers (120, 130) Adsorption to the housing 110 can be prevented by tilting toward the guide rails 111 to 114 .

11 is a diagram 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 actuator according to an embodiment of the present invention It is a drawing for explaining the initial alignment operation of the ball in the actuator.

Referring to FIG. 11, at least one of the balls B1, B2, B5, and B6 for moving the first carrier 120 according to the use state is in a direction opposite to the moving direction of the first carrier 120. It may contact the end of the first rail 128 located thereon. In this state, when the first carrier 120 moves in the moving direction along the first guide rail 111, the ball contacting 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.

To prevent this problem, the zoom driving actuator 100 according to an embodiment of the present invention performs an initial alignment operation of the balls 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 changed in the moving direction of the first carrier 120 and the second carrier 130. Align with the ends of the first to fourth rails (128, 129, 138, 139) located at

For example, referring to FIG. 12, during initial driving, the first carrier 120 is moved to the origin, which is opposite 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 and 129 located in the direction of movement of In this state, when the first carrier 120 moves in the moving direction along the guide rails 111 and 112, the ball contacting the end of the first rail 128 performs a rolling motion rather than a drag motion, The carrier 120 can be moved smoothly.

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

Although the present invention has been described above with limited examples and drawings, the present invention is not limited thereto and will be described below and the technical spirit of the present invention by those skilled in the art to which the present invention belongs. Of course, various modifications and variations are possible within the scope of the claims.

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

Although the accompanying drawings and the like for illustration of the description of the present invention and its embodiments may be shown in a slightly exaggerated form in order to emphasize or highlight the technical contents according to the present invention, the above-described contents and matters shown in the drawings Taking into account, it should be interpreted that it is obvious that various types of modifications can be applied at the level of those skilled in the art.

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: 1st magnet
130: second carrier 131: second mounter
133: second support 135: second guider
138: third rail 139: fourth rail
M2: 1st magnet
180: yoke 190: case

Claims (10)

A first mounter on which a first lens assembly is mounted, a first support on which a first magnet is mounted, and a first guider provided on the opposite side of the first support with respect to the first mounter, which moves in an optical axis direction. a first carrier;
A second mounter on which a second lens assembly is mounted, a second supporter on which a second magnet is mounted, and a second guider provided on the opposite side of the second supporter based on the second mounter, wherein the upper part 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;
a first coil unit facing the first magnet;
a second coil unit facing the second magnet; and
A ball disposed between the housing and the first support and between the housing and the first guider,
The first support part,
A first rail facing the first guide rail formed in the housing and divided into at least two parts with a first barrier rib formed at a center line position of the first magnet;
The first guider,
A second rail facing the second guide rail formed in the housing and having a second partition wall formed at a position facing the first partition wall to be partitioned into at least two parts;
the ball
It is disposed between the first guide rail and the first rail divided into at least two, and between the second guide rail and the second rail divided into at least two, and moves along the first rail and the second rail. felled
Zoom drive actuator.
delete According to claim 1,
The second support part,
A third rail facing the third guide rail formed in the housing, and having a third barrier rib formed at a center line position of the second magnet to be divided into at least two;
The second guider,
A fourth rail facing the fourth guide rail formed in the housing and having a fourth partition wall formed at a position facing the third partition wall to be partitioned into at least two parts;
Zoom drive actuator.
According to claim 3,
Balls disposed between the third guide rail and the third rail divided into at least two, and between the fourth guide rail and the fourth rail divided into at least two
A zoom drive actuator further comprising a.
According to claim 1,
The first carrier includes a first space forming a passage so that the second guider is movable, and the second carrier includes a second space forming a passage so that the first guider is movable.
Zoom drive actuator.
According to claim 5,
The first space is
It is formed between the first mounter and the first support,
the second space
formed between the second mounter and the second support
Zoom drive actuator.
According to claim 1,
The first support part and the first guider
It has a shape extending from the first mounter based on the optical axis direction,
The first guider
having a lower height than the first support
Zoom drive actuator.
According to claim 7,
The second support and the second guider
It has a shape extending from the second mounter based on the optical axis direction, and has a shape extending in a direction opposite to the extending direction of the first support part and the first guider,
The second guider
having a lower height than the second support
Zoom drive actuator.
According to claim 1,
A yoke provided in the housing and generating an attractive force with the first magnet and the second magnet
A zoom drive actuator further comprising a.
According to claim 1 or 4,
At the time of initial driving, the first carrier and the second carrier are moved to the origin, and the position of the ball is aligned with the ends of the first to fourth rails located in the moving direction of the first carrier and the second carrier
Zoom drive actuator.

Images