KR102595275B1 - Lens driving device - Google Patents

Abstract

A lens driving device is disclosed. The lens driving device of the present invention includes a lens barrel in which a lens is accommodated, a base, an autofocus carrier disposed on the base, an autofocus driver that moves the autofocus carrier in the optical axis direction, and the autofocus A shake compensation carrier located at the top of the carrier, a shake compensation driver that moves the shake compensation carrier in a direction perpendicular to the optical axis, at least one spring that supports the autofocus carrier so that it can move in the optical axis direction with respect to the base, and It includes at least one ball bearing located between the autofocus carrier and the shake compensation carrier.

Description

Lens driving device {LENS DRIVING DEVICE}

The present invention relates to a lens driving device that is mounted on a camera module and moves a lens barrel in at least one direction.

As electronic communication technology develops, camera modules installed in mobile electronic devices such as smartphones, tablet computers, and laptop computers are becoming more advanced. The advancement of camera modules is realized through the installation of autofocus functions, high-pixel functions, and zoom functions.

In addition, an optical image stabilization device (OIS, Optical Image Stabilizer) that can correct hand shake has recently been installed. An optical shake correction device is a device that corrects shake by moving the lens barrel relative to the sensor. This optical shake correction device is disclosed in Korean Patent No. 10-1518825 (registered on May 4, 2015) and Japanese Patent Publication No. 2013-024944 (published on February 4, 2013).

Recently, mobile electronic devices equipped with camera modules are trending towards miniaturization. Additionally, the number of pixels in camera modules tends to increase. Therefore, there is a need for a lens driving device that can be more compact than before and can provide precise shake correction.

The problem to be solved by the present invention is to provide a lens driving device that can be miniaturized.

Another problem that the present invention seeks to solve is to provide a lens driving device capable of precisely compensating for vibration of the lens barrel.

Another problem that the present invention seeks to solve is to provide a lens driving device having a structure in which the overall assembly process can be simplified by separating the assembly process of the autofocus carrier and autofocus drive unit from the assembly process of the shake compensation carrier and shake compensation drive unit. It is done.

The lens driving device of the present invention for solving the above problem is a lens driving device including a lens barrel in which a lens is accommodated, a base, an autofocus carrier disposed on the base, and moving the autofocus carrier in the optical axis direction. An autofocus driver, a shake compensation carrier located on top of the autofocus carrier, a shake compensation driver that moves the shake compensation carrier in a direction perpendicular to the optical axis, and a support for enabling the autofocus carrier to move in the optical axis direction with respect to the base. It includes at least one spring and at least one ball bearing located between the autofocus carrier and the shake compensation carrier.

In one embodiment of the present invention, the spring may include an upper spring and a lower spring located lower than the upper spring.

In one embodiment of the present invention, the spring may be formed as a leaf spring.

In one embodiment of the present invention, the spring includes an outer peripheral portion and an inner peripheral portion extending inward from the outer peripheral portion and elastically deformable in the optical axis direction with respect to the outer peripheral portion, the outer peripheral portion is coupled to the base, and The inner peripheral portion may be coupled to the autofocus carrier.

In one embodiment of the present invention, the autofocus driving unit is coupled to at least one autofocus magnet coupled to the autofocus carrier and the base, and at least a portion of the autofocus magnet is opposed to the autofocus magnet. It may include a coil for autofocus.

In one embodiment of the present invention, the autofocus coil may be wound around the optical axis.

In one embodiment of the present invention, it further includes a flexible printed circuit board coupled to the base, and the autofocus coil is coupled to the flexible printed circuit board to receive an electrical signal from a circuit formed on the flexible printed circuit board. .

In one embodiment of the present invention, the flexible circuit board may further include a position detection sensor that is coupled to the flexible circuit board to face the autofocus magnet and detects movement of the autofocus carrier in the optical axis direction.

In one embodiment of the present invention, the shake correction driving unit is coupled to at least one shake correction magnet coupled to the shake correction carrier and the base, and at least a portion of the shake correction magnet is opposite to the shake correction magnet. It may include a coil.

In one embodiment of the present invention, the vibration correction coil may be wound around an axis in a direction perpendicular to the optical axis.

In one embodiment of the present invention, it further includes a flexible circuit board coupled to the base, and the vibration correction coil is coupled to the flexible circuit board to receive an electrical signal from a circuit formed on the flexible circuit board.

In one embodiment of the present invention, a position detection sensor is coupled to the flexible circuit board to face the vibration correction magnet and detects movement of the vibration correction carrier in the optical axis direction or in a direction perpendicular to the optical axis. there is.

In one embodiment of the present invention, the autofocus driving unit is coupled to at least one autofocus magnet coupled to the autofocus carrier and the base, and at least a portion of the autofocus magnet is opposed to the autofocus magnet. It includes an autofocus coil, and the shake correction driving unit includes at least one shake correction magnet coupled to the shake correction carrier and at least one shake correction coil coupled to the base and at least a portion of the shake correction magnet is opposed to the shake correction magnet. It includes, and the autofocus magnet and the shake correction magnet may be arranged so that at least some of them face each other.

In one embodiment of the present invention, an attractive force may act between the opposing autofocus magnets and the vibration correction magnets.

In one embodiment of the present invention, the opposing portions of the autofocus magnet and the vibration correction magnet may have different polarities.

In one embodiment of the present invention, the autofocus magnet and the shake correction magnet may be formed in the same number.

In one embodiment of the present invention, the autofocus coil and the shake correction coil are disposed to face the side surfaces of the autofocus magnet and the shake correction magnet, respectively, and the upper surface of the autofocus magnet and the shake correction coil are respectively disposed so as to face each other. The lower surfaces of the magnets may be arranged to face each other.

In one embodiment of the present invention, the shake correction carrier may be positioned in close contact with the autofocus carrier with the ball bearing interposed therebetween.

In one embodiment of the present invention, the shake correction carrier may move in a direction perpendicular to the optical axis relative to the autofocus carrier.

In one embodiment of the present invention, when the autofocus carrier moves in the direction of the optical axis, the shake compensation carrier may move in the direction of the optical axis together with the autofocus carrier.

In one embodiment of the present invention, the lens barrel moves in the optical axis direction according to the movement of the autofocus carrier in the optical axis direction, and in the direction orthogonal to the optical axis according to the movement in the direction orthogonal to the optical axis of the shake compensation carrier. You can move to .

In one embodiment of the present invention, the autofocus carrier may be positioned spaced apart from the lower surface of the base.

The lens driving device according to an embodiment of the present invention can be miniaturized and can precisely compensate for vibration of the lens barrel.

Additionally, in the lens driving device according to an embodiment of the present invention, the overall assembly process can be simplified by separating the assembly process of the autofocus carrier and the autofocus driver from the assembly process of the shake compensation carrier and the shake compensation driver.

1 is a perspective view showing the appearance of a lens driving device according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view of a lens driving device according to an embodiment of the present invention taken along line AA' of FIG. 1.
Figure 3 is a cross-sectional view of a lens driving device according to an embodiment of the present invention taken along line BB' in Figure 1.
Figure 4 is an exploded perspective view of a lens driving device according to an embodiment of the present invention.
Figure 5 is an exploded perspective view of a portion corresponding to the base of the lens driving device of the present invention.
Figure 6 is a cross-sectional view of a portion corresponding to the base portion of the lens driving device of the present invention.
Figure 7 is a perspective view showing parts corresponding to the lens barrel, autofocus carrier, shake compensation carrier, ball bearing, and magnet of the lens driving device of the present invention.
Figure 8 is an exploded perspective view of parts corresponding to the lens barrel, autofocus carrier, shake compensation carrier, ball bearing, and magnet of the lens driving device of the present invention.
FIG. 9 is a cross-sectional view of a portion of the lens driving device according to an embodiment of the present invention taken along line CC' of FIG. 7.
Figure 10 is a cross-sectional view of a portion of the lens driving device according to an embodiment of the present invention taken along line DD' in Figure 7.
Figure 11 is a perspective view showing the lens barrel, autofocus carrier, shake compensation carrier, ball bearing, and magnet of the lens driving device of the present invention coupled to the autofocus coil holder in the base through a spring.
Figure 12 is an exploded perspective view showing the lens barrel, autofocus carrier, shake compensation carrier, ball bearing, and magnet of the lens driving device of the present invention coupled to the autofocus coil holder in the base through a spring.
FIG. 13 is a cross-sectional view of a portion of the lens driving device according to an embodiment of the present invention taken along line EE' of FIG. 11.
FIG. 14 is a cross-sectional view of a portion of the lens driving device according to an embodiment of the present invention taken along line FF' of FIG. 11.
Figure 15 is a perspective view showing the lens barrel, autofocus carrier, shake correction carrier, ball bearing, and magnet of the lens driving device of the present invention arranged opposite to the shake correction coil.
Figure 16 is a cross-sectional view of a portion of the lens driving device according to an embodiment of the present invention taken along line GG' in Figure 15.
FIG. 17 is a cross-sectional view of a portion of the lens driving device according to an embodiment of the present invention taken along line HH' in FIG. 15.

Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings. In explaining the present invention, if it is determined that adding a detailed description of a technology or configuration already known in the relevant field may obscure the gist of the present invention, some of it will be omitted from the detailed description. Additionally, the terms used in this specification are terms used to appropriately express the embodiments of the present invention, and may vary depending on the people or customs involved in the field. Therefore, definitions of these terms should be made based on the content throughout this specification.

Hereinafter, with reference to the attached FIGS. 1 to 17, a lens driving device according to an embodiment of the present invention will be described.

Figure 1 is a perspective view showing the appearance of a lens driving device according to an embodiment of the present invention. Figure 1 shows a three-axis coordinate system consisting of an x-axis, a y-axis, and a z-axis. In the lens driving device of the present invention, the lens is arranged with the z-axis as the optical axis. The optical axis of a lens refers to the direction in which light passing through the center of the lens travels.

In the present invention, the positive (+) direction of the z-axis is defined as upward, and the negative (-) direction of the z-axis is defined as downward. Additionally, the x-axis and y-axis directions will be defined and explained laterally.

Referring to FIG. 1, the outside of the lens driving device is shielded by a shield case 210, so only a portion of the internal structure is visible. The shield case 210 may typically be formed in a polyhedral shape. Specifically, the shield case 210 may be formed in a hexahedral shape. The shield case 210 forms part of the base 200 of the lens driving device, which will be described later, and can accommodate various configurations of the lens driving device therein. The shield case 210 is made of a hard material and can protect various components housed therein. In addition, the shield case 210 is made of a metal material, etc., and can function to shield electromagnetic wave (EMI) noise coming in from the outside or occurring inside and leaking out to the outside.

The shield case 210 has an opening 211 formed on its upper surface through which the upper surface of the lens barrel 100 can be exposed. Although not shown, the lower surface of the shield case 210 is also formed in an open form. In the shield case 210, an open path for light traveling along the optical axis is secured by the upper opening 211 and the open portion of the lower surface.

The upper surface of the lens barrel 100 is exposed through the upper surface opening 211 of the shield case 210. Specifically, the lens accommodated in the lens barrel 100 is positioned to be exposed through the opening 211. The lens barrel 100 can be moved by the autofocus driver 600 and the shake correction driver 700, which will be described later, and the opening 211 of the shield case 210 is opened to take into account the movement of the lens barrel 100. It may be formed larger than the upper surface of the barrel 100.

FIG. 2 is a cross-sectional view of a lens driving device according to an embodiment of the present invention taken along line AA' of FIG. 1. FIG. 3 is a cross-sectional view of a lens driving device according to an embodiment of the present invention taken along line BB' of FIG. 1. It is a cross-sectional view. Figure 4 is an exploded perspective view of a lens driving device according to an embodiment of the present invention.

2 to 4, the lens driving device of the present invention includes a base 200, an autofocus carrier 300, an autofocus driver 600, a shake compensation carrier 400, a shake compensation driver 700, and a spring. It includes (800), a ball bearing (500), a flexible circuit board (240), and a position sensor (900).

Although not shown in the drawing, an image sensor unit may be coupled to the lower part of the lens driving device of the present invention. The image sensor unit may include an image sensor, a circuit board on which the image sensor is mounted, and an optical filter covering the image sensor. This image sensor unit is combined in a form that covers the lower surface of the shield case 210 and is located at the lower part of the lens barrel 100.

Light traveling in the optical axis direction passes through the lens barrel 100 and forms an image on the image sensor. The image sensor converts the irradiated optical signal into an electrical signal and outputs it.

5 to 17 are exploded views of part or all of the lens driving device of the present invention. Hereinafter, each part of the lens driving device of the present invention will be described in detail with reference to FIGS. 5 to 17 along with FIGS. 2 to 4.

Figure 5 is an exploded perspective view of a portion corresponding to the base portion of the lens driving device of the present invention. Figure 6 is a cross-sectional view of a portion corresponding to the base portion of the lens driving device of the present invention.

The base 200 is fixedly positioned relative to the lens barrel 100 in the lens driving device. Specifically, the lens barrel 100 is accommodated inside the base 200 and moves in the direction of the optical axis together with the autofocus carrier 300, and moves in a direction perpendicular to the optical axis together with the shake compensation carrier 400. Specifically, movement in the optical axis direction may be movement in the z-axis direction, and movement in the direction perpendicular to the optical axis may be movement in the x-axis or y-axis direction. Here, the movement of the lens barrel 100 corresponds to relative movement with respect to the base 200.

The base 200 may include a shield case 210 and coil holders 220 and 230. Here, the coil holders 220 and 230 may include a coil holder 220 for autofocus and a coil holder 230 for shake correction. Specifically, the coil holder 220 for autofocus and a coil holder 230 for shake correction. ) can be coupled to the inside of the shield case 210. The coil holder 220 for autofocus may be located lower than the coil holder 230 for vibration correction.

A coupling portion may be formed in the coil holders 220 and 230 so that the autofocus coil 620 and the vibration compensation coil 720 can be coupled to each other. The coupling portion may be formed in the form of an opening 231 into which the coil is inserted and coupled, or in the form of a bobbin 221 through which the coil can be wound.

A flexible circuit board 240 may be coupled to the base 200. The flexible circuit board 240 has an external connection terminal 241 formed on one side, and the external connection terminal 241 is connected to the outside of the base 200. It can be formed to be exposed. In addition, a plurality of coil connection terminals 242 are formed on the flexible circuit board 240, so that the autofocus coil 620 and the shake correction coil 720 can be electrically connected.

The flexible circuit board 240 may be coupled to the coil holders 220 and 230. Specifically, the flexible circuit board 240 may be positioned between the shield case 210 and the coil holders 220 and 230. The coil holders 220 and 230 may be formed with protrusions 233 for fixing and coupling the flexible circuit board 240, and the flexible circuit board 240 may have a hole 243 into which the protrusions 233 can be inserted. This may be formed.

Figure 7 is a perspective view showing parts corresponding to the lens barrel, autofocus carrier, shake compensation carrier, ball bearing and magnet of the lens driving device of the present invention. Figure 8 is a lens barrel and autofocus of the lens driving device of the present invention. It is an exploded perspective view showing the parts corresponding to the carrier, shake compensation carrier, ball bearing, and magnet. FIG. 9 is a cross-sectional view of a portion of the lens driving device according to an embodiment of the present invention taken along line CC' of FIG. 7. Figure 10 is a cross-sectional view of a portion of the lens driving device according to an embodiment of the present invention taken along line DD' in Figure 7.

The lens barrel 100 may be formed in a cylindrical shape. The lens barrel 100 is formed with its upper and lower surfaces open so that light can pass through the upper and lower surfaces. At least one lens is accommodated inside the lens barrel 100. The lens moves together as the lens barrel 100 moves.

The vibration compensation carrier 400 may be formed to have a hollow portion 401 therein. The hollow portion 401 is open in the optical axis direction. A lens barrel 100 may be coupled to the hollow portion 401. The lens barrel 100 is fixedly coupled to the hollow portion 401 of the shake compensation carrier 400, and the lens barrel 100 and the shake compensation carrier 400 are formed to move as one body.

Specifically, the outer surface of the lens barrel 100 may be coupled to the inner peripheral surface of the hollow portion 401 of the shake compensation carrier 400. Here, the upper part of the outer surface of the lens barrel 100 is coupled to the inner peripheral surface of the hollow part 401 of the shake compensation carrier 400, and the lower part of the lens barrel 100 is connected to the lower part of the shake compensation carrier 400. It may protrude.

The vibration compensation carrier 400 may be formed in the form of a polygonal pillar having a plurality of outer surfaces. For example, the vibration compensation carrier 400 may be formed in the form of a square or octagonal pillar with four sides or eight sides. The shake compensation carrier 400 is preferably formed in a symmetrical form about the optical axis for accuracy of control while moving for shake compensation.

The shake correction carrier 400 may function as a holder for the shake correction magnet 710. The vibration compensation carrier 400 is preferably made of a resin material such as plastic so that the magnetic force of the magnet can penetrate it. Specifically, the shake correction carrier 400 may include a coupling portion 402 to which the shake correction magnet 710 can be coupled. The vibration correction magnet coupling portion 402 is formed in the shape of a groove, so that the vibration correction magnet 710 can be inserted into the groove and coupled thereto. The vibration correction magnet 710 is integrally coupled to the vibration correction carrier 400 and moves together.

One or more vibration correction magnets 710 may be formed, and accordingly, the same number of vibration correction magnet coupling portions 402 may be formed. When a plurality of magnetic coupling units 402 for vibration correction are formed, the magnetic coupling units 402 for vibration compensation are formed on a plurality of sides of the vibration compensation carrier 400, and are preferably formed at positions symmetrical to the optical axis.

The autofocus carrier 300 is located below the shake compensation carrier 400. The autofocus carrier 300 may also be formed to have a hollow portion 301 in the center. The hollow portion 301 is open in the optical axis direction. A portion of the lens barrel 100 may be inserted into the hollow portion 301 of the autofocus carrier 300. Specifically, the lower portion of the lens barrel 100 may be inserted into the hollow portion 301 of the autofocus carrier 300. However, the hollow portion 301 of the autofocus carrier 300 and the lens barrel 100 are not fixedly coupled to each other and remain separated from each other. Specifically, the lens barrel 100 is connected to the hollow portion 301 of the autofocus carrier 300. While inserted into the unit 301, it can move alone in a direction perpendicular to the optical axis. Accordingly, the hollow portion 301 of the autofocus carrier 300 is formed to be larger than the lens barrel 100, providing displacement within which the lens barrel 100 can move in a direction perpendicular to the optical axis. When the lens barrel 100 is located in the center of the hollow part 301 of the autofocus carrier 300 without applying an external force in the direction perpendicular to the optical axis, the outer peripheral surface of the lens barrel 100 is the autofocus carrier ( It remains spaced apart from the inner peripheral surface of the hollow portion 301 of 300).

When the outer surfaces of the upper and lower portions of the lens barrel 100 are formed in an extending cylindrical shape with the same cross-sectional size, the hollow part of the autofocus carrier 300 is larger than the hollow part 401 of the shake compensation carrier 400. (301) becomes larger.

The autofocus carrier 300 may be formed in the form of a polygonal pillar having a plurality of outer surfaces. For example, the autofocus carrier 300 may be formed in the shape of a square or octagonal pillar with four sides or eight sides. The autofocus carrier 300 is preferably formed in a symmetrical shape about the optical axis to ensure accuracy of control while moving for autofocus.

The autofocus carrier 300 may function as a holder for the magnet 610 for autofocus. The autofocus carrier 300 is preferably made of a resin material such as plastic so that the magnetic force of the magnet can penetrate. Specifically, the autofocus carrier 300 may include a coupling portion 302 to which the autofocus magnet 610 can be coupled. The autofocus magnet coupling portion 302 is formed in the shape of a groove so that the autofocus magnet 610 can be inserted into the groove and coupled thereto. The autofocus magnet 610 is integrally coupled to the autofocus carrier 300 and moves together.

One or more magnets 610 for autofocus may be formed, and accordingly, the same number of magnet coupling portions 302 for autofocus may be formed. A plurality of magnet coupling portions 302 for autofocus may be formed. In this case, the autofocus magnetic coupling portion 302 is formed on a plurality of side surfaces of the autofocus carrier 300, and is preferably formed at a position symmetrical to the optical axis.

The autofocus carrier 300 and the shake compensation carrier 400 may be arranged to be stacked up and down. Specifically, the shake compensation carrier 400 may be located on top of the autofocus carrier 300.

A ball bearing 500 may be located between the autofocus carrier 300 and the shake compensation carrier 400. The ball bearing 500 is positioned orthogonal to the optical axis on the autofocus carrier 300. When moving in one direction, it performs the function of reducing friction. At least three ball bearings 500 are formed to evenly support the lower surface of the vibration compensation carrier 400.

The ball bearing 500 may include a plate 510 and a ball 520.

The plate 510 may be located between the upper surface of the autofocus carrier 300 and the lower surface of the shake compensation carrier 400. The plate 510 may also be formed to have a hollow portion 501 in the center. The hollow portion 501 is open in the optical axis direction. A portion of the lens barrel 100 may be inserted into the hollow portion of the plate 510.

The plate 510 may be fixedly coupled to either the upper surface of the autofocus carrier 300 or the lower surface of the shake compensation carrier 400. In the attached drawing, the plate 510 is shown to be fixedly coupled to the upper surface of the autofocus carrier 300, but it is also possible to be fixedly coupled to the lower surface of the shake compensation carrier 400. For fixed coupling, grooves and protrusions may be formed. Specifically, as shown in the drawing, a protrusion 303 is formed on the upper surface of the autofocus carrier 300, and the protrusion 303 can be inserted and coupled to the groove 513 formed in the plate 510.

At least one hole 511 into which the ball 520 is inserted may be formed in the plate 510. The hole 511 is formed to penetrate the upper and lower surfaces of the plate 510. The ball 520 is accommodated in the hole 511, and the ball 520 rolls inside the hole 511 and functions as a bearing. Accordingly, the diameter of the hole 511 is formed to be larger than the diameter of the ball 520, so that the ball 520 can move or roll inside. A plurality of holes 511 are formed at positions symmetrical to the optical axis. This allows the ball 520 to stably support the vibration compensation carrier 400.

The plate 510 is formed to have a thickness smaller than the height of the ball 520. Therefore, the plate 510 is located between the upper surface of the autofocus carrier 300 and the lower surface of the shake compensation carrier 400, and with the ball 520 accommodated in the hole of the plate 510, the top and bottom of the ball 520 These contact the lower surface of the shake compensation carrier 400 and the upper surface of the autofocus carrier 300, respectively. And only one of the upper and lower surfaces of the plate 510 is in contact with the lower surface of the shake compensation carrier 400 and the upper surface of the autofocus carrier 300.

The ball 520 is formed in a spherical shape and can support movement in a direction perpendicular to the optical axis while the position of the vibration compensation carrier 400 in the optical axis direction does not change. Friction can be suppressed around the ball 520. Grease may be applied.

It is preferable that the upper surface of the autofocus carrier 300 and the lower surface of the shake compensation carrier 400 are formed in a generally flat shape. However, in some cases, a groove is formed in the area where the ball 520 is in contact with the upper surface of the autofocus carrier 300 and the lower surface of the shake compensation carrier 400, so that a part of the ball 520 may be formed to accommodate the groove. there is.

The autofocus magnet 610 and the shake correction magnet 710 may be coupled to the autofocus magnet coupling portion 302 and the shake correction magnet coupling portion 402, respectively. The autofocus magnet 610 is a part of the autofocus driving unit 600. The vibration correction magnet 710 is a part of the vibration correction driving unit 700.

The autofocus magnet 610 and the shake correction magnet 710 may be formed in a hexahedron. The hexahedral autofocus magnet 610 and the shake correction magnet 710 have one side and the opposite side relative to each other. It can be formed into a plate shape that is larger than the other side. Specifically, the side corresponding to the large side may be combined to face the outside of the autofocus carrier and the shake compensation carrier 400.

The autofocus magnet 610 and the shake correction magnet 710 are formed in the same number, and when the autofocus carrier 300 and the shake correction carrier 400 are arranged in a stacked form, they are positioned in a vertically overlapping form. You can. Specifically, the vibration correction magnet 710 may be located on the autofocus magnet 610. Accordingly, the upper surface of the autofocus magnet 610 and the lower surface of the shake correction magnet 710 face each other.

An attractive force is exerted between the opposing autofocus magnets 610 and the shake correction magnets 710. Specifically, the upper surface of the autofocus magnet 610 and the lower surface of the shake correction magnet 710 are formed to have different polarities, so that attraction due to a magnetic field may occur. Accordingly, the shake correction carrier 400 is It may be in close contact with the focus carrier 300 side. Specifically, the lower surface of the shake compensation carrier 400 is in close contact with the upper surface of the autofocus carrier 300 with the ball bearing 500 interposed therebetween.

In addition, after the shake compensation carrier 400 moves in a direction perpendicular to the optical axis by the shake compensation driver 700, when the external force is removed, the vibration compensation carrier 400 is moved by the attractive force between the autofocus magnet 610 and the shake compensation magnet 710. It returns to the initial position.

Figure 11 is a perspective view showing the lens barrel, autofocus carrier, shake compensation carrier, ball bearing, and magnet of the lens driving device of the present invention coupled to the coil holder for autofocus in the base through a spring. Figure 12 of the present invention It is an exploded perspective view showing the lens barrel, autofocus carrier, shake compensation carrier, ball bearing, and magnet of the lens driving device coupled to the autofocus coil holder in the base through a spring. FIG. 13 is line EE' in FIG. 11. This is a cross-sectional view of a part of a lens driving device according to an embodiment of the present invention, cut along line FF' in FIG. 11.

The autofocus driver 600 is coupled to at least one autofocus magnet 610 coupled to the autofocus carrier 300 and the base 200, and at least one autofocus magnet 610 is at least partially opposed to the autofocus magnet 610. It includes a coil 620 for autofocus.

An autofocus coil 620 is coupled to the autofocus coil holder 220. The autofocus coil 620 is formed in a wound form centered on the optical axis. Specifically, the autofocus coil 620 is wound in a spiral or concentric circle around the optical axis using the autofocus coil holder 220 as a bobbin. Therefore, the inner peripheral surface of the autofocus coil 620 is used for autofocus. It may be arranged to face the outer surface of the magnet 610. Here, a portion of the autofocus carrier 300 may be located between the inner peripheral surface of the autofocus coil 620 and the outer surface of the autofocus magnet 610.

Both ends of the autofocus coil 620 are connected to the coil connection terminal 242 of the flexible printed circuit board 240 so that it can receive an electrical signal from the outside.

The autofocus driver 600 drives the autofocus carrier 300 by interaction between the autofocus magnet 610 and the autofocus coil 620. Specifically, a force in the optical axis direction is applied to the autofocus carrier 300 according to the magnetized polarity of the autofocus magnet 610 and the direction of the current applied to the autofocus coil 620.

The autofocus carrier 300 is moved in the optical axis direction by the autofocus driver 600. At this time, moving in the optical axis direction means moving in the optical axis direction based on the base 200. 8 and 9 show only the autofocus coil holder 220, which is part of the base 200, and the autofocus carrier 300 can move in the optical axis direction with respect to the autofocus coil holder 220.

As the autofocus carrier 300 moves in the optical axis direction, the shake compensation carrier 400 located on top of the autofocus carrier 300 also moves in the optical axis direction. And the lens barrel 100, which is fixedly coupled to the shake compensation carrier 400, also moves in the direction of the optical axis.

The spring 800 supports the autofocus carrier 300 so that it can move in the optical axis direction with respect to the base 200. Specifically, one end of the spring 800 is coupled to the base 200 and the other end is coupled to the autofocus carrier 300, and is elastically deformed in the optical axis direction to prevent the autofocus carrier 300 from moving in the optical axis direction. I will support it.

Specifically, the spring 800 may be formed in the form of a leaf spring. The leaf spring 800 may include an outer peripheral portion 801 and an inner peripheral portion 802. The inner peripheral part 802 may include a moving part 803 coupled to the autofocus carrier 300 and a connecting part 804 connecting the outer peripheral part 801 and the moving part 803. The leaf spring 800 may have an opening formed inside the inner peripheral portion 802. The moving part 803 of the leaf spring 800 can move in the optical axis direction with respect to the outer peripheral part 801. In this process, the shape of the connection portion 804 may be elastically deformed.

The outer peripheral portion 801 of the leaf spring 800 is a part that is relatively fixed and coupled to the moving part 803. The outer peripheral portion 801 of the leaf spring 800 is coupled to the base 200. Specifically, the outer peripheral portion 801 of the leaf spring 800 may be coupled to the coil holder 220 for autofocus in the base 200. Additionally, the moving part 803 of the inner peripheral part 802 of the leaf spring 800 may be coupled to the autofocus carrier 300.

One or more springs 800 may be formed. For example, the spring 800 may be composed of an upper spring 810 and a lower spring 820. The upper spring 810 may be coupled to an upper part of the autofocus carrier 300 than the lower spring 820. Specifically, the upper spring 810 may be coupled near the upper surface of the autofocus carrier 300, and the lower spring 820 may be coupled near the lower surface of the autofocus carrier 300.

When the autofocus carrier 300 moves in the optical axis direction by the autofocus driver 600, the spring 800 is elastically deformed to support the movement. And when the external force caused by the autofocus driving unit 600 is removed from the autofocus carrier 300, the autofocus carrier 300 returns to its initial position by the restoring force of the spring 800.

Figure 15 is a perspective view showing the lens barrel, autofocus carrier, shake correction carrier, ball bearing, and magnet of the lens driving device of the present invention arranged opposite to the shake correction coil. Figure 16 is taken along line GG' in Figure 15. This is a cross-sectional view of a part of a lens driving device according to an embodiment of the present invention. FIG. 17 is a cross-sectional view of a part of a lens driving device according to an embodiment of the present invention taken along line HH' of FIG. 15.

The vibration correction driving unit 700 is coupled to at least one vibration correction magnet 710 and the base 200 coupled to the vibration correction carrier 400, and has at least one vibration correction magnet 710 that is at least partially opposed to the vibration correction magnet 710. Includes a correction coil 720.

A vibration correction coil 720 is coupled to the vibration correction coil holder 230. The vibration correction coil 720 is formed in a wound form centered on an axis in a direction perpendicular to the optical axis. The vibration correction coil 720 may be oriented in a direction perpendicular to the autofocus coil 620. The wound side of the vibration correction coil 720 is disposed to face the side of the vibration correction magnet 710. A plurality of vibration correction coils 720 may be formed to face a plurality of vibration correction magnets 710.

Both ends of the vibration compensation coil 720 are connected to the coil connection terminal 242 of the flexible printed circuit board 240 so that an electrical signal can be supplied from the outside.

The shake correction driver 700 drives the shake correction carrier 400 through interaction between the shake correction magnet 710 and the shake correction coil 720. Specifically, the shake compensation driver 700 may include a first shake compensation driver and a second shake compensation driver. The first shake compensation driver 700 moves the shake compensation carrier 400 in a direction perpendicular to the second shake compensation driver. Runs . For example, the first shake compensation driver may move the shake compensation carrier 400 in the x-axis direction, and the second shake compensation driver may move the shake compensation carrier 400 in the y-axis direction. The first and second vibration correction driving units 700 may include a vibration correction magnet 710 and a vibration correction coil 720, respectively. The magnet and coil of the first vibration correction driving unit and the magnet and coil of the second vibration compensation driving unit may be oriented to be perpendicular to each other.

The vibration compensation carrier 400 is moved in a direction perpendicular to the optical axis by the shake compensation driver 700 in a state in which the shake compensation carrier 400 is supported by the ball bearing 500 on the autofocus carrier 300. It means moving.

The movement of the shake compensation carrier 400 by the shake compensation driver 700 may compensate for the shaking of the camera module itself, on which the lens drive device is mounted, due to hand tremor, etc. Therefore, clear quality images can be obtained even if the camera module itself shakes.

Referring again to FIGS. 2 to 4, the position sensor 900 is coupled to the flexible circuit board 240. The position detection sensor 900 is coupled to face the autofocus magnet 610 and/or the shake correction magnet 710.

When the position sensor 900 is combined with the autofocus magnet 610 to face each other, the position sensor 900 can detect movement of the autofocus carrier 300 in the optical axis direction. The position sensor 900 may be a Hall sensor that detects changes in magnetic force. As the distance between the position detection sensor 900 and the autofocus magnet 610 changes, the movement of the autofocus carrier 300 in the optical axis direction is detected.

When the position sensor 900 is coupled to the vibration correction magnet 710 so as to face each other, the position detection sensor 900 can detect movement of the vibration correction carrier 400 in the direction of the optical axis or in a direction perpendicular to the optical axis. Here too, the position detection sensor 900 may be a Hall sensor. When the position detection sensor 900 is arranged to detect a change in magnetic force according to the movement of the vibration compensation carrier 400 in the optical axis direction, the position detection sensor 900 can detect the movement of the vibration compensation carrier 400 in the optical axis direction. You can. In addition, when the position detection sensor 900 is arranged to detect a change in magnetic force according to movement in a direction orthogonal to the optical axis of the vibration compensation carrier 400, the position detection sensor 900 is positioned on the optical axis of the vibration compensation carrier 400. Movement in orthogonal directions can be detected.

In the lens driving device of the present invention, the autofocus carrier 300 can be stably driven because the autofocus carrier 300 is supported by the spring 800. Additionally, when driving the carrier for shake compensation, precise driving is possible because only the shake compensation carrier 400 is driven separately from the autofocus carrier 300. Additionally, after assembling the autofocus carrier 300 and the autofocus driver 600, it is possible to assemble the shake compensation carrier 400 and the shake compensation driver 700, so that the two processes can be separated. This can help simplify the process and increase efficiency.

Above, embodiments of the lens driving device of the present invention have been described. The present invention is not limited to the above-described embodiments and the accompanying drawings, and various modifications and variations will be possible from the perspective of those skilled in the art to which the present invention pertains. Therefore, the scope of the present invention should be determined not only by the claims of this specification but also by equivalents to the claims.

100: Lens barrel
200: Base 210: Shield Case
220: Coil holder for autofocus 230: Coil holder for shake correction
240: Flexible circuit board 241: External connection terminal
242: Coil connection terminal
300: Autofocus carrier 400: Shake correction carrier
500: ball bearing 510: plate
520: ball
600: Autofocus driving unit 610: Magnet for autofocus
620: Coil for autofocus
700: Vibration correction driving unit 710: Vibration correction magnet
720: Coil for vibration correction
800: Spring 801: Outer periphery
802: inner peripheral part 803: moving part
804: Connection
810: upper spring 820: lower spring
900: Position detection sensor

Claims (22)

In a lens driving device including a lens barrel in which a lens is accommodated,
Base;
an autofocus carrier disposed on the base;
an autofocus driver that moves the autofocus carrier in the optical axis direction;
A vibration compensation carrier located on top of the autofocus carrier;
a shake compensation driving unit that moves the shake compensation carrier in a direction perpendicular to the optical axis;
at least one spring supporting the autofocus carrier to be movable in the optical axis direction with respect to the base; and
Comprising at least one ball bearing located between the autofocus carrier and the shake compensation carrier,
The autofocus driver,
At least one autofocus magnet coupled to the autofocus carrier; and
It is coupled to the base and includes at least one autofocus coil that is at least partially opposed to the autofocus magnet,
The vibration compensation driving unit,
At least one vibration correction magnet coupled to the vibration correction carrier; and
It is coupled to the base and includes at least one vibration correction coil that is at least partially opposed to the vibration correction magnet,
The autofocus magnet and the shake correction magnet are arranged so that at least part of them faces each other,
The autofocus coil and the shake correction coil are arranged to face the sides of the autofocus magnet and the shake correction magnet, respectively,
A lens driving device in which the upper surface of the autofocus magnet and the lower surface of the shake correction magnet are arranged to face each other.
According to claim 1,
The spring is a lens driving device including an upper spring and a lower spring located lower than the upper spring.
According to claim 1,
A lens driving device in which the spring is formed of a leaf spring.
According to claim 1,
The spring includes an outer peripheral portion and an inner peripheral portion extending inward from the outer peripheral portion and elastically deformable in the optical axis direction with respect to the outer peripheral portion,
A lens driving device wherein the outer peripheral portion is coupled to the base, and the inner peripheral portion is coupled to the autofocus carrier.
According to claim 1,
The autofocus driver,
At least one autofocus magnet coupled to the autofocus carrier; and
A lens driving device comprising at least one autofocus coil coupled to the base and at least partially facing the autofocus magnet.
According to clause 5,
A lens driving device in which the autofocus coil is wound around the optical axis.
According to clause 5,
Further comprising a flexible circuit board coupled to the base,
A lens driving device wherein the autofocus coil is coupled to the flexible printed circuit board and receives an electrical signal from a circuit formed on the flexible printed circuit board.
According to clause 7,
Coupled to the flexible circuit board so as to face the autofocus magnet,
A lens driving device further comprising a position detection sensor that detects movement of the autofocus carrier in the optical axis direction.
According to claim 1,
The vibration compensation driving unit,
At least one vibration correction magnet coupled to the vibration correction carrier; and
A lens driving device coupled to the base and including at least one vibration correction coil that is at least partially opposed to the vibration correction magnet.
According to clause 9,
A lens driving device in which the shake correction coil is wound around an axis in a direction perpendicular to the optical axis.
According to clause 9,
Further comprising a flexible circuit board coupled to the base,
A lens driving device wherein the vibration correction coil is coupled to the flexible circuit board and receives an electrical signal from a circuit formed on the flexible circuit board.
According to claim 11,
It is coupled to the flexible circuit board so as to face the vibration correction magnet,
A lens driving device further comprising a position detection sensor that detects movement of the shake compensation carrier in the optical axis direction or in a direction perpendicular to the optical axis.
delete According to claim 1,
A lens driving device in which an attractive force acts between the opposing autofocus magnets and the shake correction magnets.
According to claim 1,
A lens driving device wherein opposing parts of the autofocus magnet and the shake correction magnet have different polarities.
According to claim 1,
A lens driving device in which the autofocus magnet and the shake correction magnet are formed in equal numbers.
delete According to claim 1,
A lens driving device wherein the shake compensation carrier is positioned in close contact with the autofocus carrier with the ball bearing interposed therebetween.
According to claim 1,
A lens driving device in which the shake compensation carrier moves in a direction perpendicular to the optical axis relative to the autofocus carrier.
According to claim 1,
When the autofocus carrier moves in the optical axis direction, the shake compensation carrier moves in the optical axis direction together with the autofocus carrier.
According to claim 1,
The lens barrel moves in the direction of the optical axis as the autofocus carrier moves in the optical axis direction, and moves in a direction perpendicular to the optical axis as the shake compensation carrier moves in the direction perpendicular to the optical axis.
According to claim 1,
The autofocus carrier is a lens driving device positioned spaced apart from the lower surface of the base.

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