WO2017164432A1

WO2017164432A1 - Lens driving device

Info

Publication number: WO2017164432A1
Application number: PCT/KR2016/002890
Authority: WO
Inventors: 윤금영; 정해남
Original assignee: (주)파트론
Priority date: 2016-03-22
Filing date: 2016-03-23
Publication date: 2017-09-28
Also published as: KR102595275B1; KR20170109764A

Abstract

Disclosed is a lens driving device. A lens driving device, which has a lens barrel accommodating a lens, comprises: a base; an autofocus carrier disposed on the base; an autofocus driving unit for moving the autofocus carrier in the optical axis direction; a stabilizing carrier positioned on the upper part of the autofocus carrier; a stabilizing driving unit for moving the stabilizing carrier in the direction meeting the optical axis at a right angle; one or more springs supporting so as to enable the autofocus carrier to move with respect to the base in the optical axis direction; and one or more ball bearings positioned between the autofocus carrier and the stabilizing carrier.

Description

Lens drive

The present invention relates to a lens driving device mounted on a camera module to move the lens barrel in at least one direction.

With the development of electronic communication technology, camera modules mounted in mobile electronic devices such as smart phones, tablet computers, and laptop computers are being advanced. The advancement of the camera module is realized by the auto focus function, the high pixel function, and the zoom function.

In addition, an optical image stabilizing device (OIS, Optical Image Stabilizer) capable of compensating for hand shake has recently been installed. The optical image stabilizer is a device for compensating for vibration by moving a lens barrel relative to a sensor. For such optical image stabilizer, Korean Patent Registration No. 10-1518825 (registered on May 4, 2015) and Japanese Patent Application Laid-Open Publication No. 2013-024944 (published February 4, 2013) and the like.

Recently, the mobile electronic device in which the camera module is mounted has been miniaturized. In addition, the pixels of the camera module tend to rise. Therefore, there is a demand for a lens driving device that can be miniaturized more precisely and capable of accurate vibration correction.

An object of the present invention is to provide a lens driving apparatus that can be miniaturized.

Another object of the present invention is to provide a lens driving apparatus capable of correcting the shake of a precise lens barrel.

Another object of the present invention is to provide a lens driving apparatus having a structure in which the overall assembly process can be simplified by separating the assembly process of the autofocus carrier and the autofocus driving unit and the assembly process of the shake compensation carrier and the shake correction driving unit. It is.

The lens drive device of the present invention for solving the above problems, the lens drive device comprising a lens barrel containing a lens, the base, the autofocus carrier disposed on the base, the autofocus carrier for moving in the optical axis direction An autofocus driving unit, a shake compensation carrier positioned above the autofocus carrier, a shake compensation driving unit for moving the shake compensation carrier in a direction orthogonal to the optical axis, and supporting the autofocus carrier to be movable in the optical axis direction with respect to the base At least one spring and at least one ball bearing positioned 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 below the upper spring.

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

In one embodiment of the present invention, the spring extends inward from the outer peripheral portion and the outer peripheral portion, and includes an inner peripheral portion that can be elastically deformed in the optical axis direction with respect to the outer peripheral portion, the outer peripheral portion is coupled to the base, An inner circumference may be coupled to the autofocus carrier.

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

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

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

In an embodiment of the present invention, the flexible circuit board may further include a position sensing sensor coupled to face the autofocus magnet so as to sense a movement in the optical axis direction of the autofocus carrier.

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

In one embodiment of the present invention, the shake compensation coil may be wound around an axis in a direction orthogonal to the optical axis.

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

In an exemplary embodiment of the present invention, the flexible circuit board may further include a position sensing sensor coupled to the vibration correction magnet so as to sense a movement in an optical axis direction or a direction orthogonal to the optical axis of the vibration correction carrier. have.

In one embodiment of the present invention, the autofocus driving unit, at least one autofocus magnet coupled to the autofocus carrier and the base, and at least one opposing at least a portion of the autofocus magnet And an autofocus coil, wherein the shake compensation driving unit is coupled to at least one shake correction magnet and the base coupled to the shake correction carrier, and at least one shake correction coil coupled to the base and at least partially opposed to the shake correction magnet. Includes, the autofocus magnet and the shake compensation magnet may be disposed so that at least a portion of the magnets for opposing.

In one embodiment of the present invention, the attraction force may act between the autofocus magnet and the shake compensation magnet opposing each other.

In one embodiment of the present invention, the opposing autofocus magnet and the shake compensation magnet may have different polarities in opposing parts.

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

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

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

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

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

In one embodiment of the present invention, the lens barrel is moved in the optical axis direction in accordance with the movement of the optical axis direction of the autofocus carrier, the direction orthogonal to the optical axis in accordance with the movement in the direction orthogonal to the optical axis of the shake compensation carrier Can be moved.

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

The lens driving apparatus according to the embodiment of the present invention can be miniaturized, and the shake compensation of the lens barrel can be precisely performed.

In addition, the lens driving apparatus according to an embodiment of the present invention may simplify the overall assembly process by separating the assembly process of the autofocus carrier and the autofocus driver and the assembly process of the shake compensation carrier and the shake compensation driver.

1 is a perspective view illustrating an appearance of a lens driving apparatus according to an exemplary embodiment of the present invention.

FIG. 2 is a cross-sectional view of the lens driving apparatus according to the exemplary embodiment of the present invention, taken along line AA ′ of FIG. 1.

3 is a cross-sectional view of the lens driving apparatus according to the exemplary embodiment of the present invention, taken along the line BB ′ of FIG. 1.

4 is an exploded perspective view of a lens driving apparatus according to an embodiment of the present invention.

5 is an exploded perspective view illustrating a portion corresponding to the base portion of the lens driving apparatus of the present invention.

6 is a cross-sectional view of a portion corresponding to the base portion of the lens driving apparatus of the present invention.

7 is a perspective view showing a part corresponding to the lens barrel, the autofocus carrier, the stabilizer carrier, the ball bearing and the magnet of the lens driving device of the present invention.

8 is an exploded perspective view illustrating parts corresponding to the lens barrel, the autofocus carrier, the stabilizer carrier, the ball bearing, and the magnet of the lens driving apparatus of the present invention.

FIG. 9 is a cross-sectional view of a portion of a lens driving apparatus according to an exemplary embodiment of the present invention, taken along line CC ′ of FIG. 7.

FIG. 10 is a cross-sectional view of a part of the lens driving apparatus according to the exemplary embodiment of the present invention, cut along the line DD ′ of FIG. 7.

FIG. 11 is a perspective view illustrating a lens barrel, an autofocus carrier, a stabilizer carrier, a ball bearing, and a magnet coupled to a coil holder for autofocus among bases through a spring of the lens driving apparatus of the present invention.

12 is an exploded perspective view illustrating a lens barrel, an autofocus carrier, a stabilizer carrier, a ball bearing, and a magnet coupled to a coil holder for autofocus through a spring.

FIG. 13 is a cross-sectional view of a part of a lens driving apparatus according to an exemplary embodiment of the present invention, cut along the line EE ′ of FIG. 11.

14 is a cross-sectional view of a part of the lens driving apparatus according to the exemplary embodiment of the present invention, taken along the line FF ′ of FIG. 11.

FIG. 15 is a perspective view showing a lens barrel, an autofocus carrier, a shake compensation carrier, a ball bearing, and a magnet disposed opposite to a shake compensation coil of the lens driving device of the present invention.

FIG. 16 is a cross-sectional view of a portion of the lens driving apparatus according to the exemplary embodiment of the present invention, cut along the line GG ′ of FIG. 15.

FIG. 17 is a cross-sectional view of a portion of the lens driving apparatus according to the exemplary embodiment of the present invention, cut along the line HH ′ of FIG. 15.

Hereinafter, with reference to the accompanying drawings will be described embodiments of the present invention; In describing the present invention, if it is determined that adding specific descriptions of techniques or configurations already known in the art may make the gist of the present invention unclear, some of them will be omitted from the detailed description. In addition, terms used in the present specification are terms used to properly express the embodiments of the present invention, which may vary according to related persons or customs in the art. Therefore, the definitions of the terms should be made based on the contents throughout the specification.

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

1 is a perspective view illustrating an external appearance of a lens driving apparatus according to an exemplary embodiment of the present invention. FIG. 1 illustrates a three-axis coordinate system composed of an x-axis, a y-axis, and a z-axis. In the lens driving apparatus of the present invention, the lens is disposed with the z-axis as the optical axis. The optical axis of the lens means a 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 upward, and the negative direction of the z-axis is defined downward. In addition, the x- and y-axis directions will be defined laterally to be described.

Referring to FIG. 1, the lens driving device is shielded by the shield case 210 so that only a part of the internal structure thereof is visible. The shield case 210 may typically be formed in a polyhedron shape. Specifically, the shield case 210 may be formed in a hexahedron shape. The shield case 210 may form a part of the base 200 of the lens driving apparatus to be described later, and accommodate various components of the lens driving apparatus therein. The shield case 210 may be formed of a hard material to protect various components accommodated therein. In addition, the shield case 210 may be formed of a metal material to perform a function of shielding electromagnetic noise (EMI) noise flowing in from the outside or generated inside the outflow.

The shield case 210 has an opening 211 through which an upper surface of the lens barrel 100 may be exposed. And although not shown, the lower surface of the shield case 210 is also formed in an open form. The open path of the light traveling along the optical axis is secured by the open portions of the upper surface opening 211 and the lower surface of the shield case 210.

The top surface of the lens barrel 100 is exposed through the top opening 211 of the shield case 210. Specifically, the lens accommodated by the lens barrel 100 is positioned to be exposed through the opening 211. 100 may be moved by the autofocus driver 600 and the shake compensation driver 700, which will be described later, and the opening 211 of the shield case 210 may be configured in consideration of the movement of the lens barrel 100. It may be formed larger than the upper surface of 100).

FIG. 2 is a cross-sectional view of the lens driving apparatus according to the exemplary embodiment of the present invention, taken along line AA ′ of FIG. 1. 3 is a cross-sectional view of the lens driving apparatus according to the exemplary embodiment of the present invention, taken along the line BB ′ of FIG. 1. 4 is an exploded perspective view of a lens driving apparatus according to an embodiment of the present invention.

2 to 4, the lens driving apparatus of the present invention includes a base 200, an autofocus carrier 300, an autofocus driving unit 600, an oscillation correction carrier 400, an oscillation correction driving unit 700, and a spring. 800, a ball bearing 500, a flexible circuit board 240, and a position detection sensor 900.

Although not shown in the drawings, the image sensor unit may be coupled to the lower portion of the lens driving apparatus of the present invention. The image sensor unit may include an image sensor, a circuit board on which the image sensor is mounted, an optical filter covering the image sensor, and the like. The image sensor unit is coupled to cover the lower surface of the shield case 210 is positioned below the lens barrel 100.

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

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

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

The base 200 is positioned relatively fixed to the lens barrel 100 in the lens driving apparatus. In detail, the lens barrel 100 is accommodated in the base 200 to move in the optical axis direction together with the autofocus carrier 300 and moves in the direction orthogonal to the optical axis together with the shake compensation carrier 400. Specifically, the movement in the optical axis direction may be the movement in the z-axis direction, and the movement in the direction orthogonal to the optical axis may be the movement in the x-axis or y-axis direction. Here, the movement of the lens barrel 100 corresponds to the 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 an autofocus coil holder 220 and a shake compensation coil holder 230. Specifically, the autofocus coil holder 220 and the shake compensation coil holder 230 may be used. ) May be coupled to the inside of the shield case 210. The autofocus coil holder 220 may be located below the vibration compensation coil holder 230.

Coupling

holders

220 and 230 may be formed with coupling portions so that the autofocus coil 620 and the vibration compensation coil 720 may be coupled, respectively. The coupling portion may have a shape of an opening 231 into which the coil is inserted and coupled. The coil may be formed in the form of a bobbin 221 which can be wound and wound.

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

The flexible circuit board 240 may be coupled to the

coil holders

220 and 230. In detail, 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 have protrusions 233 for fixing and coupling the flexible circuit board 240, and the holes 243 into which the protrusions 233 may be inserted into the flexible circuit board 240. It may be formed.

7 is a perspective view showing a part corresponding to the lens barrel, the autofocus carrier, the stabilizer carrier, the ball bearing and the magnet of the lens driving device of the present invention. 8 is an exploded perspective view illustrating parts corresponding to the lens barrel, the autofocus carrier, the stabilizer carrier, the ball bearing, and the magnet of the lens driving apparatus of the present invention. FIG. 9 is a cross-sectional view of a portion of a lens driving apparatus according to an exemplary embodiment of the present invention, taken along line CC ′ of FIG. 7. FIG. 10 is a cross-sectional view of a part of the lens driving apparatus according to the exemplary embodiment of the present invention, cut along the line DD ′ of FIG. 7.

The lens barrel 100 may be formed in a cylindrical shape. The lens barrel 100 is formed to have an open top and bottom surfaces so that light may pass through the top and bottom surfaces. At least one lens is accommodated in the lens barrel 100. The lens moves with the lens barrel 100 as it moves.

The shake compensation carrier 400 may be formed to have a hollow portion 401 therein. The hollow part 401 is open in the optical axis direction. The 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, such that the lens barrel 100 and the shake compensation carrier 400 are integrally moved.

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

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

The shake compensation carrier 400 may function as a holder for the shake compensation magnet 710. The vibration compensation carrier 400 is preferably formed of a resin material such as plastic so that the magnetic force of the magnet can pass therethrough. Specifically, the shaking compensation carrier 400 may include a coupling part 402 to which the shaking compensation magnet 710 may be coupled. The vibration compensation magnet coupling part 402 may be formed in the shape of a groove so that the vibration compensation magnet 710 may be inserted into and coupled to the groove. The shaking compensation magnet 710 is integrally coupled to the shaking compensation carrier 400 to move together.

One or more tremor correction magnets 710 may be formed. Accordingly, the tremor correction magnet coupling portion 402 may be formed in the same number. When the tremor correction magnet coupling portion 402 is formed, The shake compensation magnet coupling part 402 is formed on a plurality of side surfaces of the shake compensation carrier 400, and is preferably formed at a position symmetrical to the optical axis.

The autofocus carrier 300 is positioned below the shake compensation carrier 400. Autofocus carrier 300 may also be formed to have a hollow portion 301 in the central portion. The hollow part 301 is open in the optical axis direction. A part of the lens barrel 100 may be inserted into the hollow part 301 of the autofocus carrier 300. In detail, 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 and remain separated from each other. Specifically, the lens barrel 100 is hollow of the autofocus carrier 300. It can be moved in the direction orthogonal to the optical axis alone in the state inserted into the portion 301. Therefore, the hollow portion 301 of the autofocus carrier 300 is larger than the lens barrel 100 to provide a displacement in which the lens barrel 100 can move in a direction orthogonal to the optical axis. When the lens barrel 100 is positioned at the center of the hollow portion 301 of the autofocus carrier 300 without an external force applied in a direction perpendicular to the optical axis, the outer circumferential surface of the lens barrel 100 is an autofocus carrier ( Maintaining a state spaced apart from the inner peripheral surface of the hollow portion 301 of 300.

When the outer surface of the upper portion and the lower portion of the lens barrel 100 is formed in a cylindrical shape extending with the same cross-sectional size, the hollow portion of the autofocus carrier 300 than the hollow portion 401 of the shake compensation carrier 400 301 becomes larger.

The autofocus carrier 300 may be formed in the shape of a polygonal column having an outer surface with a plurality of surfaces. For example, the autofocus carrier 300 may be formed in the shape of a square pillar or an octagonal pillar having four sides or eight sides. The autofocus carrier 300 is preferably formed to be symmetrical about the optical axis for 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 formed of a resin material such as plastic so that the magnetic force of the magnet can pass therethrough. In detail, the autofocus carrier 300 may include a coupling part 302 to which the autofocus magnet 610 may be coupled. The autofocus magnet coupling portion 302 may be formed in the shape of a groove so that the autofocus magnet 610 may be inserted into and coupled to the groove. The autofocus magnet 610 is integrally coupled to the autofocus carrier 300 to move together.

One or more autofocus magnets 610 may be formed, and accordingly, the same number of autofocus magnet coupling portions 302 may be formed. A plurality of autofocus magnet coupling portions 302 are formed. In this case, the autofocus magnet coupling portion 302 is formed on a plurality of side surfaces of the autofocus carrier 300, but 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. In detail, the shake compensation carrier 400 may be positioned above the autofocus carrier 300.

The ball bearing 500 may be positioned between the autofocus carrier 300 and the shake compensation carrier 400. The ball bearing 500 may have the shake compensation carrier 400 orthogonal to the optical axis on the autofocus carrier 300. In moving in the direction, it performs a function of reducing friction. At least three ball bearings 500 may be formed to evenly support the lower surface of the shake 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. Plate 510 may also be formed to have a hollow portion 501 in the central portion. The hollow part 501 is open in the optical axis direction. A part of the lens barrel 100 may be inserted into the hollow part of the plate 510.

The plate 510 may be fixedly coupled to one of the top surface of the autofocus carrier 300 or the bottom surface of the shake compensation carrier 400. In the accompanying drawings, the plate 510 is fixedly coupled to the top surface of the autofocus carrier 300, but may be fixedly coupled to the bottom surface of the vibration compensation carrier 400. For fixed engagement, grooves and protrusions may be formed. Specifically, as shown in the figure, the projection 303 is formed on the upper surface of the autofocus carrier 300, the projection 303 may be inserted into the groove 513 formed in the plate 510 may be coupled.

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 to function as a bearing. Therefore, the diameter of the hole 511 is larger than the diameter of the ball 520, the ball 520 is formed to be able to move or roll inside. A plurality of holes 511 are formed in a position symmetrical to the optical axis As a result, the ball 520 can stably support the shake 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 positioned between the upper surface of the autofocus carrier 300 and the lower surface of the shake compensation carrier 400, and the upper and lower ends of the ball 520 in the state where the ball 520 is accommodated in the hole of the plate 510. The lower surface of each of the shake compensation carriers 400 is in contact with the upper surface of the autofocus carrier 300. In addition, only one surface of the upper surface and the lower surface 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 may be formed in a spherical shape to support movement in a direction orthogonal to the optical axis in a state in which the position in the optical axis direction of the shake compensation carrier 400 is not changed. Friction can be suppressed around the ball 520. Grease may be applied.

The upper surface of the autofocus carrier 300 and the lower surface of the shake compensation carrier 400 are preferably formed in a planar shape. However, in some cases, a groove is formed in a portion 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 portion of the ball 520 may be formed in a shape in which the groove is accommodated. have.

The autofocus magnet 610 and the shake compensation magnet 710 may be coupled to the autofocus magnet coupling part 302 and the shake compensation magnet coupling part 402, respectively. The autofocus magnet 610 is part of the autofocus driver 600. The shake compensation magnet 710 is a part of the shake compensation driver 700.

The autofocus magnet 610 and the shake compensation magnet 710 may be formed of a hexahedron. The hexahedral shape autofocus magnet 610 and the shake compensation magnet 710 have one side and a side opposite thereto. It may be formed in a plate shape larger than the other surface. In detail, a surface corresponding to a large side surface may be coupled to face the outer side of the carrier for autofocus and the shake compensation carrier 400.

The autofocus magnet 610 and the shake compensation magnet 710 are formed in the same number, and when the autofocus carrier 300 and the shake compensation carrier 400 are arranged in a stacked form, they are positioned to overlap each other. Can be. In detail, the shake compensation magnet 710 may be positioned on the autofocus magnet 610. Accordingly, the upper surface of the autofocus magnet 610 and the lower surface of the shake compensation magnet 710 are opposed to each other.

The attraction force is applied between the autofocus magnet 610 and the vibration compensation magnet 710 facing each other. In detail, the top surface of the autofocus magnet 610 and the bottom surface of the shake compensation magnet 710 may be formed to have different polarities, thereby causing attraction by a magnetic field. Accordingly, the shake compensation carrier 400 may be automatically 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 therebetween.

In addition, after the shake compensation carrier 400 moves in the direction orthogonal to the optical axis by the shake compensation driver 700, when the external force is removed, the attraction force between the autofocus magnet 610 and the shake compensation magnet 710 is reduced. It will return to the initial position.

FIG. 11 is a perspective view illustrating that a lens barrel, an autofocus carrier, an anti-shake carrier, a ball bearing, and a magnet are coupled to an autofocus coil holder of a base through a spring of the lens driving apparatus of the present invention. FIG. A perspective view of the lens barrel, the autofocus carrier, the stabilizer carrier, the ball bearing, and the magnet of the lens driving device, in which the base is coupled to the coil holder for autofocus through a spring. 11 is a cross-sectional view of a part of the lens driving apparatus according to the exemplary embodiment of the present invention, which is cut away.

The autofocus driver 600 is coupled to the at least one autofocus magnet 610 and the base 200 coupled to the autofocus carrier 300 and at least one of which faces at least a portion of the autofocus magnet 610. Autofocus coil 620 is included.

The autofocus coil 620 is coupled to the autofocus coil holder 220. The autofocus coil 620 is formed to be wound around an optical axis. Specifically, the autofocus coil 620 is wound in a spiral or concentric shape around the optical axis using the autofocus coil holder 220 as a bobbin. Therefore, the inner circumferential surface of the autofocus coil 620 is for autofocus. It may be disposed to face the outer surface of the magnet 610. Here, a part of the autofocus carrier 300 may be located between the inner circumferential surface of the autofocus coil 620 and the outer surface of the autofocus magnet 610.

Both ends of the autofocus coil 620 may be connected to the coil connection terminal 242 of the flexible circuit board 240 to receive an electric signal from the outside.

The autofocus driver 600 drives the autofocus carrier 300 by an 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. In this case, moving in the optical axis direction means moving in the optical axis direction with respect to the base 200. 8 and 9 illustrate only the autofocus coil holder 220 which is a part of the base 200, and the autofocus carrier 300 may 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 positioned above the autofocus carrier 300 also moves in the optical axis direction. In addition, the lens barrel 100 fixedly coupled to the shake compensation carrier 400 also moves in the optical axis direction.

The spring 800 supports the autofocus carrier 300 to be movable in the optical axis direction with respect to the base 200. Specifically, one end of the spring 800 is coupled to the base 200 portion and the other end is the autofocus carrier. It is coupled to the portion 300, and elastically deformed in the optical axis direction to support the movement of the autofocus carrier 300 in the optical axis direction.

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

The outer circumference 801 of the leaf spring 800 is a portion fixedly coupled to the moving part 803. The outer circumference 801 of the leaf spring 800 is coupled to the base 200. In detail, the outer circumferential portion 801 of the leaf spring 800 may be coupled to the autofocus coil holder 220 of the base 200. In addition, the moving part 803 of the inner circumferential 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 portion of the autofocus carrier 300 than the lower spring 820. Specifically, the upper spring 810 may be coupled to the vicinity of the upper surface of the autofocus carrier 300, the lower spring 820 may be coupled to the vicinity of 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. When the external force of the autofocus driver 600 is removed from the autofocus carrier 300, the autofocus carrier 300 returns to the initial position by the restoring force of the spring 800.

FIG. 15 is a perspective view showing a lens barrel, an autofocus carrier, a shake compensation carrier, a ball bearing, and a magnet disposed opposite to a shake compensation coil of the lens driving device of the present invention. FIG. 16 is a cross-sectional view of a portion of the lens driving apparatus according to the exemplary embodiment of the present invention, cut along the line GG ′ of FIG. 15. FIG. 17 is a cross-sectional view of a portion of the lens driving apparatus according to the exemplary embodiment of the present invention, cut along the line HH ′ of FIG. 15.

The vibration correction driver 700 is coupled to the at least one vibration correction magnet 710 and the base 200 coupled to the vibration correction carrier 400, and at least one vibration that at least partially faces the vibration correction magnet 710. The correction coil 720 is included.

The vibration correction coil 720 is coupled to the vibration correction coil holder 230. The vibration compensation coil 720 is formed in a wound form about an axis in a direction orthogonal to the optical axis. The vibration compensation coil 720 may be oriented in a direction orthogonal to each other with the autofocus coil 620. The wound surface of the shake compensation coil 720 is disposed to face the side of the shake compensation magnet 710. A plurality of vibration correction coils 720 may be formed to face the plurality of vibration correction magnets 710.

Both ends of the vibration correction coil 720 may be connected to the coil connection terminal 242 of the flexible circuit board 240 to receive an electric signal from the outside.

The shake compensation driver 700 drives the shake compensation carrier 400 by an interaction between the shake compensation magnet 710 and the shake compensation coil 720. In detail, the shake compensation driving unit 700 may include a first shake correction driving unit and a second shake correction driving unit. The first shake correction driving unit may be orthogonal to the second shake correction driving unit in a direction perpendicular to each other. Drive. For example, the first shake compensation driving unit may move the shake compensation carrier 400 in the x-axis direction, and the second shake compensation driving unit may move the shake compensation carrier 400 in the y-axis direction. The first and second shake compensation driver 700 may include a shake correction magnet 710 and a shake correction coil 720, respectively. The magnet, the coil, and the magnet and the coil of the second shake compensation driver of the first shake compensation driver may be oriented to be orthogonal to each other.

Movement of the shake compensation carrier 400 in the direction orthogonal to the optical axis by the shake compensation driver 700 is performed in a state in which the shake compensation carrier 400 is supported by the ball bearing 500 on the autofocus carrier 300. It means to move.

The movement of the vibration correction carrier 400 by the vibration compensation driver 700 may be to compensate for the shaking of the camera module itself on which the lens driving apparatus is mounted due to hand shaking. Therefore, even if the camera module itself is shaken, a clear image can be obtained.

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

When the position detection sensor 900 is coupled to face the autofocus magnet 610, the position detection sensor 900 may detect a movement in the optical axis direction of the autofocus carrier 300. The position sensor 900 may be a hall sensor that detects a change in magnetic force. As the distance between the position 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 detecting sensor 900 is coupled to face the anti-shake correction magnet 710, the position detecting sensor 900 may detect a movement in the optical axis direction or a direction orthogonal to the optical axis of the shake compensation carrier 400. Here too, the position sensor 900 may be a hall sensor. When the position detection sensor 900 is arranged to detect a change in the magnetic force in accordance with the movement of the optical axis direction of the shake compensation carrier 400, the position detection sensor 900 may detect the movement of the optical axis direction of the shake compensation carrier 400. Can be. In addition, when the position detection sensor 900 is arranged to detect a change in the magnetic force in accordance with the movement in the direction orthogonal to the optical axis of the shake compensation carrier 400, the position detection sensor 900 to the optical axis of the shake compensation carrier 400 The movement in the orthogonal direction can be detected.

In the lens driving apparatus of the present invention, since the autofocus carrier 300 is supported by the spring 800, the autofocus carrier 300 may be stably driven. In addition, when the carrier is driven for the shake compensation, since the shake compensation carrier 400 is driven independently of the autofocus carrier 300, precise driving is possible. In addition, 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 may be separated. This can simplify the process and increase the efficiency.

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

Claims

A lens driving apparatus comprising a lens barrel in which a lens is accommodated,

Base;

An autofocus carrier disposed on the base;

An autofocus driver for moving the autofocus carrier in an optical axis direction;

An anti-shake carrier positioned on an upper portion of the autofocus carrier;

A shake correction driver for moving the shake correction carrier in a direction orthogonal to the optical axis;

At least one spring supporting the autofocus carrier to be movable in an optical axis direction with respect to the base; And

And at least one ball bearing positioned between the autofocus carrier and the shake compensation carrier.
According to claim 1,

The singer spring includes a top spring and a bottom spring positioned below the top spring.
According to claim 1,

The spring is a lens driving device formed of a leaf spring.
According to claim 1,

The spring includes an outer circumference portion and an inner circumference portion extending inwardly from the outer circumference portion and elastically deformable in the optical axis direction with respect to the outer circumference portion.

The outer circumferential portion is coupled to the base, and the inner circumference portion is coupled to the autofocus carrier.
According to claim 1,

The autofocus drive unit,

At least one autofocus magnet coupled to the autofocus carrier; And

And at least one autofocus coil coupled to the base and facing at least a portion of the autofocus magnet.
The method of claim 5,

The autofocus coil is a lens driving device that is wound around the optical axis.
The method of claim 5,

Further comprising a flexible circuit board coupled to the base,

The autofocus coil is coupled to the flexible circuit board to receive an electric signal from a circuit formed on the flexible circuit board.
The method of claim 7, wherein

Coupled to the flexible circuit board so as to face the autofocus magnet,

The lens driving device further comprises a position sensor for detecting the movement of the autofocus carrier in the optical axis direction.
According to claim 1,

The shake compensation driving unit,

At least one shake correction magnet coupled to the shake correction carrier; And

And at least one shake correction coil coupled to the base and facing at least a portion of the shake correction magnet.
The method of claim 9,

The vibration correction coil is a lens driving apparatus having a shape wound around an axis in a direction perpendicular to the optical axis.
The method of claim 9,

Further comprising a flexible circuit board coupled to the base,

The vibration compensating coil is coupled to the flexible circuit board to receive an electrical signal from a circuit formed on the flexible circuit board.
The method of claim 11, wherein

It is coupled to the flexible circuit board so as to face the shake compensation magnet,

The lens driving device further comprises a position sensor for detecting the movement in the optical axis direction or the direction orthogonal to the optical axis of the shake compensation carrier.
According to claim 1,

The autofocus drive unit,

At least one autofocus magnet coupled to the autofocus carrier; And

At least one autofocus coil coupled to the base, the at least one opposing the autofocus magnet;

The shake compensation driving unit,

At least one shake correction magnet coupled to the shake correction carrier; And

At least one vibration compensation coil coupled to the base and facing at least a portion of the vibration correction magnet;

And the autofocus magnet and the shake compensation magnet are arranged so that at least a portion thereof faces each other.
The method of claim 13,

An attraction force is applied between the opposing autofocus magnet and the shake compensation magnet.
The method of claim 13,

The lens driving apparatus of the autofocus magnet and the vibration correction magnet, which face each other, have polarities different from each other.
The method of claim 13,

And the autofocus magnet and the shake compensation magnet are formed in the same number.
The method of claim 13,

The autofocus coil and the shake correction coil are disposed to face the sides of the autofocus magnet and the shake correction magnet, respectively.

And a top surface of the autofocus magnet and a bottom surface of the shake compensation magnet to face each other.
According to claim 1,

And the shake compensation carrier is positioned in close contact with the autofocus carrier with the ball bearing therebetween.
According to claim 1,

And the shake compensation carrier moves in a direction orthogonal to the optical axis relative to the autofocus carrier.
According to claim 1,

And 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,

And the lens barrel moves in the optical axis direction according to the movement of the optical axis direction of the autofocus carrier, and moves in the direction orthogonal to the optical axis in accordance with the movement of the direction orthogonal to the optical axis of the shake compensation carrier.
According to claim 1,

And the autofocus carrier is spaced apart from the bottom surface of the base.