KR101421223B1 - A camera module having the AF and the OIS function - Google Patents

Abstract

The present invention relates to a camera module capable of correcting camera shake by moving a lens in an optical axis direction by an interaction between a coil and a magnet to adjust a focus of a subject and moving the lens in a horizontal direction, (OIS) by driving the lens on a plane (xy plane) perpendicular to the optical axis (z axis) by driving the lens with the lens A base having a fitting groove formed in each of the corner directions and each side surface being open; An OIS coil member inserted in the fitting groove of the base and wound on an x-y plane; A cover which is seated in the base and whose side is opened and in which a space is formed; A carrier wound around the outer circumferential surface of the AF coil member, the carrier being inserted in the lens module and movable in the optical axis direction; A magnet attached to the open side of the cover and magnetized to have different polarities from the inside and the outside of the cover; And a hook-shaped elastic member having one end inserted into the upper surface of the cover and the other end coupled to a bottom surface of the base to elastically support the cover to the base; Wherein the magnet and the OIS coil member are disposed adjacent to each other in the optical axis direction to drive the cover and the carrier on an xy plane by a magnetic force in the direction of the optical axis of the magnet to perform an anti- .

Description

[0001] The present invention relates to a camera module having an auto focus and an image stabilization function,

The present invention relates to a camera module capable of correcting camera shake by moving a lens in the direction of an optical axis by an interaction between a coil and a magnet to adjust a focus of the subject and moving the lens in a horizontal direction.

Typically, the camera module has an image sensor, which is widely used in mobile devices such as mobile phones, notebook computers, portable degassing assistance, cameras for inserting monitors, rear surveillance cameras of automobiles, or intercoms.

In addition, recent camera modules tend to be miniaturized and lightweight with very high pixels, resulting in image distortion due to the sensitivity of the photographed images to disturbance.

Recently, a camera module having an auto focus (AF) function and an optical image stabilization (OIS) function has been recently developed and commercialized in order to compensate for the distortion of such an image to obtain clear images.

Generally, the auto focus function is exerted by moving the lens barrel accommodating the lens in the direction of the optical axis, and the camera shake compensation function is exerted by horizontally moving and pressing the key on a plane perpendicular to the optical axis direction.

Particularly, with respect to the camera shake compensation function, there is a camera module which has a more accurate camera shake compensation function by applying a displacement in the optical axis direction (z axis) instead of a simple parallel movement on a plane (xy plane) perpendicular to the optical axis direction .

Among these, Patent Document 1 discloses a camera module that performs the above two functions by using the same magnet without separately providing a magnet related to the auto-focus function and a magnet associated with the camera-shake correction function.

In the camera module disclosed in Patent Document 1, as shown in Fig. 1, a second coil member for performing an auto-focus function is inserted into an insertion hole formed in a first coil member for performing an image stabilization function, However, since the polarity for forming the magnetic field in the first coil member and the polarity for forming the magnetic field in the second coil member must be separately provided, it is possible to reduce the number of components, And the magnetic field acting on the first coil member and the second coil member are overlapped or canceled with each other so that the movement of the lens in the vertical direction and the horizontal direction There is a problem in that the power required for the power source can be increased.

As shown in Fig. 2, Patent Document 2 discloses an autofocus coil block that faces two adjacent magnets in a mover including four magnets arranged on the outer circumferential surface of one bobbin, The coil block for autofocus causes the lens to move up and down due to the magnetic force of the magnet. The coil block for the shake correction causes the magnetic flux of the lens to move up and down due to the magnetic force of the magnet. However, since the coil blocks on the four sides are simply classified as auto focusing and shake correction, the driving force is small, and in order to give the required driving force You can use a coil or a magnet with a large magnetic force. There is no problem in.

- Patent Document 1: Korean Published Patent Application No. 10-2012-0097122 (published on Mar. 09, 2012) - Patent Document 2: Korean Patent Laid-Open Publication No. 10-2014-0003716 (published on Apr. 10, 2014)

SUMMARY OF THE INVENTION It is an object of the present invention to provide a camera module capable of smoothly performing an auto focus function and a camera shake correction function while reducing the number of magnets in order to solve the problems of the prior art as described above.

It is another object of the present invention to provide a camera module having a fine and accurate camera shake correcting function by guiding the lens movement in the horizontal direction on the x-y plane to a displacement in the z-axis direction with a simple mechanical structure.

The camera module according to the present invention having the above-described object is configured to drive the lens in the optical axis direction (z axis) to perform an autofocus function (AF), and to project the image on a plane (xy plane) perpendicular to the optical axis A camera module having a base on which a fitting groove is formed in each corner of the bottom surface and each side surface is opened; An OIS coil member inserted in the fitting groove of the base and wound on an x-y plane; A cover which is seated in the base and whose side is opened and in which a space is formed; A carrier wound around the outer circumferential surface of the AF coil member, the carrier being inserted in the lens module and movable in the optical axis direction; A magnet attached to the open side of the cover and magnetized to have different polarities from the inside and the outside of the cover; And a hook-shaped elastic member having one end inserted into the upper surface of the cover and the other end coupled to a bottom surface of the base to elastically support the cover to the base; Wherein the magnet and the OIS coil member are disposed adjacent to each other in the optical axis direction to drive the cover and the carrier on an xy plane by a magnetic force in the direction of the optical axis of the magnet to perform an anti- .

In addition, a plate-shaped upper spring is coupled to the upper surface of the cover, and a plate-shaped lower spring can be coupled to the lower surface of the carrier.

Preferably, the bottom surface of the magnet and the OIS coil member are separated by a predetermined gap by an IR cap interposed between the bottom spring and the OIS coil member.

Meanwhile, a support protrusion for securing the elasticity of the lower spring central portion by supporting the lower spring may be formed on the upper surface of the IR cap, and one end of the elastic member may include a first through hole formed in the upper spring Through the fourth through hole formed in the IR cap through a third through hole formed in the second spring formed on the upper surface of the cover, and the other end of the elastic member is connected to the bottom of the base And is fixed to the coupling hole formed on the surface.

In addition, a plurality of upper projections are formed on the upper surface of the carrier, and an upper coupling groove corresponding to the upper projection is formed on the upper spring, so that the upper projection is fitted into the upper coupling groove, It is preferable that elastic restoration can be carried out while moving together.

It is preferable that the magnet has the same polarity in the direction of the optical axis, and the inside of the cover is N-pole and the outside is magnetized to the S-pole so that the cover moves upward by the coil member for AF Do.

According to the camera module according to the present invention having the above-described configuration, since the automatic focusing function and the camera shake correction function can be performed simultaneously using the same magnet and the magnetic force in the z-axis direction is used from the magnet, And the movement of the lens in the horizontal direction on the xy plane is induced to the displacement in the z-axis direction due to the simple mechanical structure, so that the fine and accurate correction of the camera shake can be performed.

1 is a perspective view of a conventional camera module disclosed in Patent Document 1,
2 is a perspective view of another conventional camera module disclosed in Patent Document 2,
FIG. 3 is a perspective view showing an assembled state of the camera module according to the embodiment of the present invention, FIG.
4 is a sectional view taken along the line AA of Fig. 3,
5 is an exploded perspective view of FIG. 3,
6 is a perspective view showing a mechanism for performing an autofocus function,
Fig. 7 is a perspective view showing a mechanism for performing an image stabilization function,
8 is a perspective view showing an operation state in which the shaking motion correction function is performed.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings through preferred embodiments.

The embodiments of the present invention can be modified in various forms, and the scope of the present invention should not be construed as being limited to the embodiments described below. The embodiments are provided to explain the present invention to a person having ordinary skill in the art to which the present invention belongs. Accordingly, the shape of each element shown in the drawings may be exaggerated to emphasize a clearer description.

The terms first, second, etc. may be used to describe various elements, but the elements should not be limited by terms. Terms are used only for the purpose of distinguishing one component from another.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the technical scope of the present invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

FIG. 3 is a perspective view of a camera module according to an embodiment of the present invention, FIG. 4 is a cross-sectional view taken along the line A-A of FIG. 3, and FIG. 5 is an exploded perspective view of the camera module of FIG.

In order to avoid duplication of explanations, the coupling relationship between the configurations of the camera module according to the embodiment of the present invention will be described based on the exploded perspective view of FIG.

As shown in FIG. 5, the remaining structures are housed in an inner space formed by the base 100.

The OIS coil member 200 and the OIS coil member, which will be described later, are mounted on the base 100 in a rectangular shape in a plan view (xy plane) Grooves 110 are formed, and a support member capable of serving as a frame extends upwardly in the vicinity of each corner.

The height of the upper support is approximately the same as the overall height of the camera module according to the present embodiment.

The OIS coil member 200 is wound around a bar-shaped bobbin as a focusing member. The upper OIS coil member 200, which is a feature of the present invention, is arranged so that current flows in a loop existing on the x-y plane.

The IR cap 900 has a central portion and is plate-like. A supporting protrusion 910 is formed at each corner of the upper surface. Each of the vertexes protrudes slightly outward. A fourth through hole 950 is formed in the protruded portion. The elastic member 950 600 may penetrate through the fourth through hole 950 and may move in a horizontal direction together with the cover 300 to be described later.

The lower spring 800 is placed above the IR cap 900. The lower spring 800 is also a leaf spring and is supported by the support protrusions 910 formed on the upper IR cap 900 so that the lower spring 800 floats from the upper surface of the IR cap 900, So that the lower spring 800 can exert an elastic restoring force against the displacement in the optical axis direction even in the state in which the IR cap 900 is placed.

The bottom surface of the magnet 500 and the top surface of the upper OIS coil member 200, which will be described later, can maintain a constant gap from each other depending on the thickness of the upper IR cap. A third through hole 850 is formed at each corner of the lower spring 800 so that one end of the elastic member 600 to be described later is connected to the fourth through hole 950.

The carrier 400 is seated and fixed on the upper surface of the upper lower spring 800.

The carrier 400 has a lens module L inserted therein, and a coil member 450 for AF is wound around the center of the outer periphery of the carrier 400 in a strip shape.

5, the lens module L and the frame of the carrier are screwed together and move integrally, but are shown in a separated state for convenience of explanation.

The carrier 400 has four projections for coupling with the upper spring to be described later. The carrier 400, the upper spring 700 and the lower spring 800 are fixed to each other, .

The cover 300 has a substantially rectangular shape when viewed in a plan view and has four legs formed downward from the respective vertexes to open both the side and top surfaces, .

Four second through-holes 350 are formed through the legs of the cover so that one end of the elastic member 600, which will be described later, can be inserted in the vicinity of the vertex of the top surface of the cover 300.

A magnet 500 is attached to each of four open sides of the cover 300 and a plate yoke as a focusing element is attached to the outer surface of the magnet 500.

The upper spring 700 is placed on the upper surface of the cover 300 and the lower spring 800 is brought into contact with the lower surface of the cover 300. The upper spring 700 and the lower spring 800 Only the cover 300 is connected to the upper spring 700 and the lower spring 800 only by the elastic member 600. [

The magnet 500 is arranged to have different polarities only in the x-axis and y-axis directions. That is, the magnet 500 according to the present embodiment does not necessarily have to be one magnet when viewed from one side of the cover 300, but is arranged so as to always have the same polarity in the z-axis direction.

The magnet 500 is attached to and fixed to the leg of the cover 300 and the polarity of the magnetized magnet on the bottom surface of each magnet 500 is arranged to face each end face of the OIS coil member 200.

The upper spring 700 is formed integrally with the carrier 400 and has an upper engaging groove 710 corresponding to the upper protrusion 410 formed in the upper carrier 400 so as to be fitted therein, As shown in Fig.

Also, a first through hole 750 is formed in the vicinity of each vertex of the upper spring 700, and the first end of the elastic member 600, which will be described later, is first inserted.

Since the upper spring 700 is a plate-shaped spring that can exert an elastic force at the center portion like the lower spring 800, the upper spring 700 performs a function of returning due to its restoring force after the carrier 400 moves upward, And functions to limit the displacement width of the carrier 400 in the upward direction and the downward direction.

Next, as shown in Fig. 5, the elastic member 600 has a hook shape. One end of the elastic member 600 is connected to the first through hole 750 of the upper spring 700, the second through hole 350 of the cover 300, the third through hole 850 of the lower spring 800, The cover 300, the lower spring 800 and the IR cap 900 through the fourth through hole 950 of the cap 900 and the other end is directly connected to the base 100 through the fourth through- (Not shown).

Hereinafter, the operation between the respective components will be described.

1. The function of AF (Auto Focus function)

6 illustrates a process of performing an auto focus function of the camera module according to the present embodiment.

The magnet 500a of one of the four magnets 500 attached to the side surface of the cover 300 will be described.

The plane in which the upward direction in the direction of the optical axis is the positive direction of the z axis and the plane perpendicular to the optical axis is the xy plane and the left direction in the drawing is defined as the positive direction of the x axis and the positive direction of the y axis is defined as positive direction.

With the inside of the cover 300 as the center, the magnet 500a is magnetized to the N pole and the S pole in the positive y axis direction. Magnetic force lines are emitted from the N pole surface of the magnet 500a so that the direction of the magnetic force is directed toward the y axis negative direction and the AF coil member 450 wound around the outer circumferential surface of the carrier 400 is rotated in the x axis negative direction A force is generated in the z-axis positive direction due to the Fleming's left-hand rule, so that the carrier 400 moves upward and adjusts the focus.

2. The function of OIS (hand shake compensation function)

The most significant feature of the present invention is that an image stabilization function can be performed simultaneously with autofocus using the magnetic force generated from the same magnet, and the OIS function is performed using the magnetic force generated in the z axis direction of the magnetic force generated from the same magnet .

FIG. 7 is a diagram showing an operation of performing the OIS function.

For convenience of explanation, the magnet of FIG. 7 will be described with reference to a magnet 500b having a well-bottomed surface and an OIS coil member 200a disposed opposite to the magnet 500a, which are different from the magnet 500a shown in FIG.

The bottom surface of the magnet 500b is also magnetized to the N pole and the S pole in the y axis negative direction and the magnetic force lines appear in the direction perpendicular to the bottom surface of the magnet 500b, that is, the z axis negative direction.

At this time, the OIS coil member 200 of this embodiment is wound on the xy plane, and when power is applied from a control unit (not shown) so that current flows clockwise on the xy plane, A current flows in the x-axis positive direction through the first member 200a ', and a current flows in the negative direction of the x-axis in the outer member 200a ".

The upper surface of the inner member 200a 'of the OIS coil member 200a is opposed to the N pole of the magnet 500b and the upper surface of the outer member 200a "of the OIS coil member 200a is opposed to the upper surface of the magnet 500b S pole.

Then, a magnetic force is applied to the inner member 200a 'of the OIS coil member 200a in the negative direction of the z axis, and a magnetic flux directed toward the S pole, that is, z Since the magnetic force acts in the direction of the positive axis, the electromagnetic force acts in the y-axis positive direction by the Fleming's left-hand rule.

Accordingly, the camera shake correction function is performed by a mechanism in which the cover 300, including the magnet 500, in which the carrier 400 is housed is moved in the y-axis positive direction as a whole.

It can be seen that electromagnetic force can act in the direction of positive x-axis, positive y-axis direction, negative x-axis direction or y-axis negative direction depending on the direction of current and polarity, ) Are arranged in the same z-axis direction and the OIS coil member 200 is wound on the xy plane, it can move in a plane perpendicular to the optical axis (z axis).

At this time, one end of the elastic member 600 is connected to the first through hole 750 of the upper spring 700, the second through hole 350 of the cover 300, the third through hole 350 of the lower spring 800, The cover 300, the lower spring 800 and the IR cap 900 through the through hole 850 and the fourth through hole 950 of the IR cap 900, And the other end is directly inserted and fixed only to the coupling hole 150 formed on the bottom surface of the base 100. Thus, the base 100 is fixed to the cover 300, the carrier 400, the upper spring 700 ), The lower spring 800, and the IR cap 900 move in the horizontal direction, thereby correcting the shaking motion.

8 is a view showing the movement path of the camera module in this embodiment. That is, the camera module according to the present embodiment does not correct the camera-shake only by moving in the horizontal direction, but the base 100 is fixed by the elastic member 600, and all the remaining components mounted on the camera 100 move in the horizontal direction Therefore, hand movement can be prevented by the synthetic component of the motion component in the vertical direction rather than the linear motion on the simple xy plane.

While the present invention has been described in connection with certain preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

For example, although the polarity of the magnet 500 of the present invention is shown as N pole and S pole in the outward direction from the inside, the polarity may be changed unless the polarity in the z axis direction changes, The number of the magnets attached to each side of the magnet may also be one or more.

100: Base 200: OIS coil member
300: Cover 400: Carrier
500: Magnet 600: Elastic member
700: upper spring 800: lower spring
900: IR cap L: Lens module
110: fitting groove 150: engaging groove
750: first through hole 350: second through hole
850: Third through hole 950: Fourth through hole
450: AF coil member 710: upper coupling groove
410: Upper projection 910: Support projection

Claims (7)

A camera that performs the camera shake correction function (OIS) by driving the lens on the optical axis (z axis) and the lens on the plane (xy plane) perpendicular to the optical axis (z axis) In the module,
A base 100 formed with a fitting groove 110 in each corner of the bottom surface and having an open side;
An OIS coil member 200 inserted into the fitting groove 110 of the base 100 and wound on an xy plane;
A cover 300 which is placed in the base 100 and has a side surface opened and a space formed therein;
A carrier 400 wound around the outer circumferential surface of the AF coil member 450 and disposed in the space of the cover 300 so as to be movable in the optical axis direction with the lens module L inserted therein;
A magnet 500 attached to the open side surface of the cover 300 and magnetized to the inside and outside of the cover 300 with different polarities; And
A hook-shaped elastic member 600 having one end inserted into the upper surface of the cover 300 and the other end coupled to a bottom surface of the base 100 to elastically support the cover 300 to the base 100, ; And
A plate-shaped lower spring 800 coupled to a lower surface of the carrier 400; Including,
The magnet 500 and the OIS coil member 200 are disposed adjacent to each other in the optical axis direction so that the cover 300 and the carrier 400 are moved in the xy plane direction by the magnetic force in the direction of the optical axis of the magnet 500 To perform the camera shake correction function,
The lower surface of the magnet 500 and the upper surface of the OIS coil member 200 are spaced apart from each other by a predetermined gap by an IR cap 900 interposed between the lower spring 800 and the OIS coil member 200 Camera module with auto focus function and camera shake correction function. The method according to claim 1,
And a plate-shaped upper spring 700 is coupled to an upper surface of the cover. The camera module has an auto focus function and an image stabilization function. delete 3. The method of claim 2,
And a support protrusion 910 for securing the elasticity of the central portion of the lower spring 800 by supporting the lower spring 800 is formed on the upper surface of the IR cap 900. [ A camera module having a function. 5. The method of claim 4,
One end of the elastic member 600 is inserted into the second through hole 350 formed on the upper surface of the cover 300 through the first through hole 750 formed in the upper spring 700, The other end of the elastic member 600 is connected to the fourth through hole 950 of the IR cap 900 through the third through hole 850 formed in the base 100, And the camera module is fixed to the coupling hole (150) formed on the bottom surface. 3. The method according to claim 1 or 2,
A plurality of upper protrusions 410 are formed on the upper surface of the carrier 400 and an upper coupling groove 710 corresponding to the upper protrusions 410 is formed in the upper spring 700, Is fitted into the upper coupling groove (710). The method according to any one of claims 1, 2, 4, and 5,
Wherein the magnet 500 has the same polarity in the optical axis direction (z-axis direction), and the inside of the cover 300 is N-pole and the outside is magnetized S-pole. .

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