KR20160009389A - Lens moving apparatus - Google Patents

Abstract

According to an embodiment of a lens driving device, the lens driving device can comprise: a hollow cover member; a bobbin provided inside the cover member to be movable in a first direction by an electromagnetic interaction; a first magnet provided in the cover member to move the bobbin; and a flexible circuit board provided at the lower side of the bobbin and electrically connected to a coil coupled to the bobbin.

Description

[0001] LENS MOVING APPARATUS [0002]

Embodiments relate to a lens driving apparatus capable of reducing noise, reducing mechanical resonance phenomenon, simplifying the structure, and reducing manufacturing costs.

The contents described in this section merely provide background information on the embodiment and do not constitute the prior art.

In recent years, IT products such as mobile phones, smart phones, tablet PCs, and notebooks, which incorporate ultra-compact digital cameras, are actively under development.

2. Description of the Related Art In general, an IT product incorporating an ultra-small digital camera includes an image sensor for converting external light into a digital image or a digital image, and a lens driving unit for adjusting the distance between the lenses and aligning the focal distance of the lens.

In general, a micro-digital camera performs a control process of finding a point at which a clearest image is generated on the basis of the sharpness of a digital image formed on an image sensor according to the distance between the lens and the image sensor in order to perform auto focusing Consists of. When the auto focusing is performed, the bobbin on which the lens is mounted moves in the optical axis direction by the first magnet, and the elastic member provided on the upper side and / or the lower side of the bobbin elastically supports the movement of the bobbin.

 However, when the bobbin moves in the direction of the optical axis, vibration in the direction of the optical axis occurs in the bobbin. As a result, the elastic member vibrates, noise due to the vibration of the elastic member occurs, and mechanical resonance may occur.

Therefore, it is an object of the present invention to provide a lens driving apparatus capable of reducing noise, reducing mechanical resonance phenomenon, simplifying the structure, and reducing manufacturing cost.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed.

One embodiment of the lens driving device includes a hollow cover member; A bobbin provided in the cover member and movable in a first direction by an electromagnetic interaction; A first magnet disposed on the cover member and moving the bobbin; And a flexible circuit board provided below the bobbin and electrically connected to the coil coupled to the bobbin.

Wherein the bobbin is provided with at least one lens therein, a winding ring is coupled to an outer circumferential surface of the bobbin, the coil is wound on an outer circumferential surface of the winding ring, and the first and second magnets are electromagnetically interacted with each other, Or in one direction.

One embodiment of the lens driving device may further include a base coupled to a lower end of the cover member, wherein the flexible printed circuit board is one in which one side is coupled to a lower portion of the bobbin, have.

One embodiment of the lens driving device may further include a second circuit board attached to one side of the base and / or the cover member, and electrically connected to the flexible circuit board.

The flexible printed circuit board may be configured such that one end of the flexible circuit board is coupled to a first protrusion formed at a lower end of the bobbin and the other end is coupled to a second protrusion formed at the base.

The coil may be coupled to the winding ring by bonding or insert injection.

One embodiment of the lens driving device may further include a displacement sensing unit for determining a displacement value of the bobbin moved in the first direction, wherein the displacement sensing unit includes: a second magnet coupled to the bobbin; And a position sensor disposed inside the cover member and having a predetermined distance from the second magnet at a position corresponding to the second magnet.

The first magnet may be provided at least one distance apart from the second magnet in the circumferential direction of the winding ring.

The cover member is formed in a rectangular shape in side view in the first direction, and the position detecting sensor is provided at an edge of the cover member, and the first magnet has a corner where the position detecting sensor is provided, At least one of which is provided inside the cover member at an edge other than the opposite corner.

The first magnet may be provided in a pair, and each of the first magnets may be provided inside the edge of the cover member facing each other.

The winding ring may be coupled to the bobbin so as to surround at least a part of the bobbin, and the coil may surround the outer circumferential surface of the winding ring.

The winding ring may be provided with a rotation preventing portion for preventing rotation of the winding ring at an upper end thereof.

The rotation preventing portion may be formed such that at least one end of the rotation ring is bent at the upper end of the winding ring, and the end portion is linearly formed so as to correspond to the inner side surface of the cover member at least partially formed in a plane.

The rotation preventing portions are provided symmetrically or radially with respect to the upper end of the winding ring so as to correspond to the respective inner side surfaces of the cover member provided at least in a pair and facing each other at least partially in a plane .

The flexible printed circuit board may be arranged in a second direction and / or a third direction in which the longitudinal direction thereof is perpendicular to the first direction.

Wherein the cover member is formed with a hollow yoke for restricting leakage of a magnetic field on an upper inner circumferential surface thereof, and the yoke is formed in a circular or polygonal cross-section as viewed in the first direction, And may have a circular or polygonal cross-section.

A receiving portion may be formed between the yoke and the cover member so that the outer surface of the yoke and the inner surface of the cover member are spaced apart from each other by a predetermined distance.

The receiving portion may be formed in a shape in which an upper end is closed and a lower end is opened, and is formed in a circumferential direction of the yoke.

The receiving portion may be configured such that at least a part of the winding ring and / or the coil is accommodated, and the outer surface of the yoke and the inner surface of the winding ring are provided so as to correspond to each other with a predetermined distance.

In the embodiment, the configuration of the lens driving apparatus can be simplified.

Further, in the embodiment, the upper and lower elastic members are replaced by the flexible circuit board, so that the vibrations inevitably caused by the elastic members and the mechanical resonance phenomena caused thereby can be avoided and the noise generated by the elastic members and the like can be remarkably reduced There is an effect that can be.

In addition, according to the embodiment, the upper and lower elastic members, the housing, and the first magnet used in the general lens driving apparatus can be eliminated, thereby reducing cost and simplifying the process in the lens driving apparatus. It is effective.

Further, in the embodiment, the outer surface of the yoke and the inner surface of the winding ring are provided so as to correspond to each other with a constant distance from each other. The spacing distance effectively corresponds to the tilt generated when the bobbin moves in the first direction.

In addition, since the embodiment has a structure in which the winding ring is coupled to the bobbin and the coil is wound on the winding ring, the deformation of the bobbin due to heat or tension generated when the coil is wound can be remarkably reduced, Can be reduced.

Further, in the embodiment, when using the integral type yoke having the above-described structure, the amount of foreign matter introduced into the upper end of the lens driving apparatus can be remarkably reduced.

In addition, in the embodiment, when the lens barrel is rotated to fasten the lens barrel or the like to the screw thread in the assembling process of the lens driving device, the rotation preventing portion is in contact with at least a part of the inner surface of the cover member, It is possible to remarkably reduce the number of objects.

1 is an exploded perspective view showing a lens driving apparatus according to an embodiment.
2 is a cross-sectional view illustrating a portion of a lens driving apparatus according to an embodiment.
Figures 3A-3D show cross-sectional views of embodiments of the bobbin illustrated in Figures 1 and 2, respectively.
Figures 4A-4D show perspective views of embodiments of the winding ring illustrated in Figure 2;
Figures 5A-5E show a perspective view of a modified embodiment of the winding ring illustrated in Figure 4D.
Figs. 6A to 6D show a state in which the winding ring illustrated in Figs. 4A to 4D is combined with the coil.
7 shows a perspective view in which a winding ring and a coil are combined.
FIG. 8 is a cross-sectional view showing a combination of a bobbin and a winding ring according to another embodiment.
9A and 9B show cross-sectional views of the lens driving apparatus of the conventional and the embodiments, respectively.
10 is a view showing the inside of a lens driving apparatus according to an embodiment.
11A is a cross-sectional view of a lens driving apparatus according to an embodiment.
11B is an enlarged view showing a part of FIG.
12A and 12B are a perspective view and a bottom perspective view showing the cover member of the embodiment.
13 is a perspective view showing a modified embodiment of the winding ring of the embodiment.
14 is a schematic view showing embodiments of the flexible circuit board of the embodiment.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. The embodiments are to be considered in all aspects as illustrative and not restrictive, and the invention is not limited thereto. It is to be understood, however, that the embodiments are not intended to be limited to the particular forms disclosed, but are to include all modifications, equivalents, and alternatives falling within the spirit and scope of the embodiments. The sizes and shapes of the components shown in the drawings may be exaggerated for clarity and convenience.

The terms "first "," second ", and the like can be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. In addition, terms specifically defined in consideration of the constitution and operation of the embodiment are only intended to illustrate the embodiments and do not limit the scope of the embodiments.

In the description of the embodiments, when it is described as being formed on the "upper" or "on or under" of each element, the upper or lower (on or under Quot; includes both that the two elements are in direct contact with each other or that one or more other elements are indirectly formed between the two elements. Also, when expressed as "on" or "on or under", it may include not only an upward direction but also a downward direction with respect to one element.

It is also to be understood that the terms "top / top / top" and "bottom / bottom / bottom", as used below, do not necessarily imply nor imply any physical or logical relationship or order between such entities or elements, But may be used only to distinguish one entity or element from another entity or element.

Further, in the drawings, an orthogonal coordinate system (x, y, z) can be used. In the drawing, the x axis and y axis mean a plane perpendicular to the optical axis. For convenience, the optical axis direction (z axis direction) can be referred to as a first direction, the x axis direction as a second direction, and the y axis direction as a third direction .

1 is an exploded perspective view of a lens driving apparatus according to an embodiment. FIG. 2 is a partial cross-sectional view showing a portion of the lens driving apparatus illustrated in FIG. 1; FIG.

The lens driving apparatus illustrated in FIGS. 1 and 2 may include a mover 100, a cover member 200, a first magnet 500, and a base 700.

First, the cover member 200 can be coupled to the base 700, and the underside of the cover member 200 can be supported by the base 700.

In addition, the cover member 200 is formed in a hollow shape, and the yoke 210 that shields the magnetic field can be integrally formed. The specific structure of the yoke 210 will be described later.

The cover member 200 may be formed of a ferromagnetic material such as iron. In addition, the cover member 200 may have an outer shape when viewed from above, and may have a circular inner shape so as to cover the bobbin 150, but the embodiments are not limited thereto. At this time, the cover member 200 may be formed in an octagonal shape as shown in FIG. 1, or may be provided in a quadrangular shape, as shown in FIG. If the first magnet 500 disposed at the corner of the cover member 200 has a trapezoidal shape when viewed from above, the magnetic field leaking from the corner of the cover member 200 to the outside can be minimized.

The first magnet 500 is provided on the cover member and serves to drive the mover 100. When the first magnet 500 is directly fixed to the cover member 200, the first magnet 500 may be fixed to the cover member 200. In this case, when the first magnet 500 is directly fixed to the cover member 200, 200). ≪ / RTI >

When the cover member 200 is made of metal, it is effective to shield the magnetic field if the surface of the cover member 200 that is in contact with the first magnet 500 is large. In addition, at least two faces of the first magnet 500 can contact the cover member 200. For example, when the first magnet 500 has a trapezoidal shape when viewed in a plane on the Z axis, the first magnet 500 may contact the inner surface of the cover member 200 by at least three sides. In addition, in the embodiment, the first magnet 500 is disposed at two corners of the cover member 200. And may be disposed on four inner sides of the cover member 200. [

Meanwhile, the mover 100 may include a bobbin 150, a winding ring 180, and a coil 190.

The bobbin 150 may be installed in the inner space of the cover member 200 so as to be reciprocally movable in the Z-axis direction. The bobbin 150 can be coupled with the winding ring 180 on the outer circumferential surface of the bobbin 150 so that the bobbin 150 can be electromagnetically interacted with the first magnet 500. The coil 190 is wound on the outer circumferential surface of the winding ring, Or combined.

The bobbin 150 may be coupled with a lens barrel (not shown) in which at least one lens is installed, and the lens barrel may be formed to be screwable inside the bobbin 150. Although not shown, it is also possible that the lens barrel is directly fixed to the inside of the bobbin 150 by a method other than screwing, or one or more lenses may be integrally formed with the bobbin 150 without a lens barrel . The lens may be composed of a single sheet, or two or more lenses may be configured to form an optical system.

Meanwhile, as shown in FIG. 2, the first magnet 500 and the winding ring 180 may be spaced apart by a certain distance g. 2, it is possible to prevent the upper elastic member 410 from contacting or interfering with the first magnet 500 even when the bobbin 150 moves up and down in the Z-axis direction So that the bobbin 150 can smoothly move. Such a separation distance g may be formed in the horizontal direction, the circular direction or the vertical direction as shown, or may be formed in a direction satisfying the combination thereof. That is, even when the bobbin 150 moves, the winding ring 180 always needs to be separated from the first magnet 500 by a predetermined distance or more.

The winding ring 180 may be coupled to the bobbin 150 and the coil 190 may be wound on the outer circumferential surface 184 of the winding ring 180 to have a ring shape.

Hereinafter, embodiments of the bobbin 150, the winding ring 180, and the coil 190 in the above-described moving part 100 will be described in detail with reference to the accompanying drawings. The bobbin 150 and the winding ring 180 may be integrally formed by insert injection or the like and the bobbin 150 may be integrally formed with the winding ring 180. [ 180 may be removably attached to the bobbin 150.

The bobbin 150 may include a first body portion B1 and a support portion B1S.

The first body part B1 may serve to house at least one lens on the inner side. The first body part B1 may be formed into a hollow cylindrical shape. The bobbin 150 having a cylindrical shape may include a top end 152 and a bottom end 154 opposite the top end 152.

A female screw portion is formed on the inner circumferential surface of the bobbin 150 to accommodate the lens therein, and the lens barrel can be fastened to the female screw portion.

The support portion B1S of the bobbin 150 may protrude outward from the outer circumferential surface 156 of the first body portion B1.

The support portion BIS may be integral with the first body portion B1 as illustrated in Figs. 1 and 2, but the embodiments are not limited thereto. That is, according to another embodiment, the support part BIS and the first body part B1 may be formed separately from each other, and the support part BIS may be attached to the first body part B1.

Further, although the support portion BIS is shown protruding from the lower end of the first body portion B1, the embodiment is not limited to this. That is, according to another embodiment, not only the lower end of the first body part B1 but also the upper end of the first body part B1 may protrude from the upper end or the upper end as long as the support part BIS can support the winding ring 180 described later.

FIGS. 3A-3D illustrate cross-sectional views of embodiments 150A, 150B, 150C, and 150D of the bobbin 150 illustrated in FIGS. 1 and 2, respectively.

As illustrated in Figs. 3A to 3D, the support portion B1S may include a first groove (or recess) H1. Here, the first groove H1 may extend in the first direction of the lens. In this case, as illustrated in FIG. 2, the winding ring 180 may have a shape that can be accommodated in the first groove H1.

Further, as illustrated in Figs. 3B and 3D, the support portion B1S may further include a second groove H2. The second groove H2 may communicate with the first groove H1 and extend in a second direction different from the first direction (e.g., the Y-axis direction). In this case, as illustrated in FIG. 2, the winding ring 180 extends from the first groove H1 to the second groove H2 and has a shape that is receivable, so that the coil ring 180 is firmly supported by the support portion B1S .

Also, as illustrated in FIGS. 3A to 3D, the first groove H1 may be disposed apart from the outer circumferential surface 156 of the first body portion B1.

Further, as illustrated in Figs. 3C and 3D, the support portion B1S may further include a third groove H3. The third groove H3 may extend in the Z axis direction which is the first direction between the first groove H1 and the outer peripheral surface 156 of the first body B1.

The embodiment is not limited to the depths of the first to third grooves H1 to H3 described above. For example, the first groove H1 may have a depth suitable to receive and support the winding ring 180.

In addition, although the winding ring 180 according to the above-described embodiment may include a material having magnetism, the embodiment is not limited to the kind of the material of the winding ring 180. That is, according to another embodiment, the winding ring 180 may be made of a non-magnetic material.

Again, referring to Figures 1 and 2, the winding ring 180 having a shape that can be supported by the bobbin 150 may include a second body portion. The second body portion may include at least one second body B2, a guide portion B2S1, and a hooking portion B2S2.

Here, the coil 190 may be wound on the outer peripheral surface 184 of at least one second body B2. The coil 190 may be disposed at a position corresponding to the first magnet 500. Although the coil 190 is shown as having a circular planar shape in the embodiment, the coil 190 may have an angular shape other than circular, according to another embodiment, and may have an octagonal shape. That is, since the coil 190 is wound on the winding ring 180, the plane shape of the winding ring 180 and the plane shape of the coil 190 can be the same.

For example, the coil 190 may be a circular-shaped wire / square-shaped wire-wound coil, and the material may be a copper wire or aluminum or a composite wire of copper and aluminum, but the embodiment is not limited thereto. Further, the outer surface of the coil may be formed of an insulating material.

The coil 190 and the first magnet 500 may have the same curvatures on opposite surfaces, but the embodiments are not limited thereto. This is in consideration of the electromagnetic action with the first magnet 500 arranged opposite to the first magnet 500. Since the electromagnetic force can be maximized when the corresponding surface of the first magnet 500 is flat and the surface of the coil 190 facing the first magnet 500 is flat to be.

However, the present invention is not limited thereto. Depending on design specifications, the surfaces of the first magnet 500 and the coil 190 may be curved surfaces, all planar, or one curved surface and one planar surface.

The second body B2 of the second body part can be supported by the support part B1S of the bobbin 150. [ The inner circumferential surface 182 of the second body B2 may be opposed to the outer circumferential surface 156 of the bobbin 150. [

According to the embodiment, the winding ring 180 may have the same planar shape as the bobbin 150. As illustrated in FIG. 1, each of the winding ring 180 and the bobbin 150 is shown as having an annular planar shape, although the embodiment is not limited in this respect.

That is, each of the bobbin 150 and the winding ring 180 may have various planar shapes, for example, a polygonal planar shape. Alternatively, the planar shape of the bobbin 150 and the planar shape of the winding ring 180 may be different from each other. The shape of the winding ring 180 in which the coil 190 is wound can be changed so that the surface of the coil 190 facing the first magnet 500 has a desired curvature.

The second body B2 of the winding ring 180 may be spaced apart from the first body B1 of the bobbin 150 in the second direction. Here, the second direction may be a Y-axis direction different from the first direction.

Hereinafter, various embodiments of the above-described winding ring 180 will be described with reference to FIGS. 4A to 4D and 5A to 5E.

Figs. 4A-4D are perspective views of embodiments of winding ring 180 (180A, 180B, 180C, 180D) illustrated in Fig.

As illustrated in Figs. 4B and 4D, the winding rings 180B and 180D may include a guide portion B2S1. The guide portion B2S1 may define a winding area CA which protrudes outward from the upper end of the second body B2 of the winding rings 180B and 180D and in which the coil 190 is wound. That is, as illustrated in FIG. 2, the coil 190 can be wound up to just under the guide portion B2S1.

In some cases, as illustrated in Figs. 4A and 4C, the guide portion B2S1 in the winding rings 180A and 180C may be omitted.

Further, as illustrated in Figs. 4C and 4D, the winding rings 180C and 180D may further include a latching jaw B2S2. The engaging jaw B2S2 protrudes inward from the lower end of the inner circumferential surface 182 of the second body B2 and protrudes inward from the second groove B2S2 of the support portion B1S of the bobbin 150B and 150D illustrated in Fig. H2. ≪ / RTI > In some cases, the engagement jaws B2S2 may be omitted in the winding rings 180A, 180B, as illustrated in Figs. 4A and 4B.

The coupling force between the bobbins 150B and 150D and the winding rings 180C and 180D is increased so that the bobbins 150B and 150D and the windings 180C and 180D, The rings 180C and 180D can be prevented from being separated. Here, although the engagement step B2S2 is shown as having a saw tooth shape, the embodiment is not limited to the shape of the engagement step B2S2.

Figures 5A-5E show a perspective view of a modified embodiment 180D-1, 180D-2, 180D-3, 180D-4, 180D-5 of the winding ring 180D illustrated in Figure 4D.

The winding ring 180D illustrated in Fig. 4D has the guide portion B2S1 and the engagement jaw B2S2. This winding ring 180D can be deformed into various shapes as illustrated in Figs. 5A to 5E.

4D, the inner circumferential surface 182 of the second body B2 may have a shape that opposes the entire outer circumferential surface 156 of the bobbin 150. In the case of the winding ring 180D illustrated in FIG.

5A to 5E, the inner circumferential surface 182 of the second body B2 may have a shape that opposes a part of the outer circumferential surface 156 of the bobbin 150 other than the entirety.

Also, as illustrated in Figs. 5A to 5C, a plurality of second bodies 182 may be provided. In this case, each of the plurality of second bodies 182 may have a columnar shape, but the embodiment is not limited thereto.

Referring to FIG. 5A, the plurality of second bodies B21-1, B22-1, B23-1 and B24-1 in the winding ring 180D-1 may be spaced apart from each other. At this time, the plurality of second bodies B21-1, B22-1, B23-1, and B24-1 may be spaced apart from each other at regular intervals or at different intervals.

The first distance D1 between the second bodies B21-1, B22-1, B23-1 and B24-1 is larger than the distance between the second bodies B21-1, B22-1, B23-1, B24-1, respectively, but the embodiment is not limited to this. That is, according to another embodiment, the first distance D1 may be equal to or less than the first width W1.

Similarly, referring to FIG. 5B, in the winding ring 180D-2, the plurality of second bodies B21-2, B22-2, B23-2, and B24-2 may be spaced apart from each other. At this time, the plurality of second bodies B21-2, B22-2, B23-2, and B24-2 may be spaced from each other at regular intervals or may be spaced apart from each other.

The second distance D2 between the second bodies B21-2, B22-2, B23-2 and B24-2 is larger than the distance between the second bodies B21-2, B22-2, B23-2, B24-2, respectively, but the embodiment is not limited to this. That is, according to another embodiment, the second distance D2 may be equal to or less than the second width W2.

5C, the plurality of second bodies B21-3, B22-3, B23-3, and B24-3 in the winding ring 180D-3 are spaced apart from each other . At this time, the plurality of second bodies B21-3, B22-3, B23-3, and B24-3 may be spaced from each other at regular intervals or may be spaced apart from each other.

However, unlike the example illustrated in FIGS. 5A and 5B, the third distance D3, in which the plurality of second bodies B21-3, B22-3, B23-3, and B24-3 illustrated in FIG. 5C are spaced apart, May be smaller than the third width (W3) of each of the second bodies (B21-3, B22-3, B23-3, B24-3), but the embodiment is not limited thereto. That is, according to another embodiment, the third distance D2 may be equal to or greater than the third width W3.

Also, as illustrated in FIG. 5A, the plurality of second bodies B21-1, B22-1, B23-1, and B24-1 may not be connected to each other. On the other hand, the lower ends of the plurality of second bodies B21-2, B22-2, B23-2, and B24-2 illustrated in FIG. 5B may be connected to each other by a first lower end connecting portion 186. [ In addition, the lower ends of the plurality of second bodies B21-3, B22-3, B23-3, and B24-3 illustrated in FIG. 5C may be connected to each other by a second lower end connection portion 188.

In addition, the above-described latching bosses B2S2 may be part of the first and second lower connection portions 186 and 188. [

5D and 5E, the upper portion of the second body B2 in the winding rings 180D-4 and 180D-5 may be formed in a concavo-convex shape.

On the other hand, the coil 190 may be wound on the outer peripheral surface 184 of the second body B2 of the winding ring 180.

Figs. 6A to 6D show a state in which the winding rings 180A to 180D illustrated in Figs. 4A to 4D are combined with the coil 190. Fig.

The winding rings 180A, 180B, 180C and 180D illustrated in Figs. 6A to 6D may correspond to the sectional views of the winding rings 180A, 180B, 180C and 180D illustrated in Figs. 4A to 4D, respectively. 6A to 6D, the coil 190 may be wound on the winding area CA. Here, as illustrated in Fig. 6B or 6D, the winding area CA can be defined by the guide part B2S1.

7 shows a perspective view in which the winding rings 180B and 180D and the coil 190 are combined. Referring to FIG. 7, it can be seen that the coil 190 can be wound on the outer circumferential surface 184 of the winding rings 180B and 180D illustrated in FIG. 6B or 6D.

The winding ring 180 and the coil 190 described above may be coupled to each other by an adhesive or may be coupled to each other by insert injection, Lt; / RTI >

Fig. 8 is a cross-sectional view showing a combination of the bobbin 150E and the winding ring 180E according to another embodiment.

As illustrated in FIG. 8, according to another embodiment, the outer peripheral surface 156 of the bobbin 150E may be coated with a winding ring 180E. In this case, the winding ring 180E coated on the outer peripheral surface 156 of the bobbin 150E may further include the guide portion B2S1. The guide portion B2S1 protrudes outward from the upper end of the second body B2 of the winding ring 180E to define a winding region in which the coil 190 is wound.

1 and 2, the first magnet 500 may be disposed opposite the coil 190 to interact with the coil 190 to move the bobbin 150 in a first direction . That is, the bobbin 150 can be moved upward in the Z-axis direction by the force generated by the Fleming's left-hand rule by the magnetic field generated from each first magnet 500 and the current flowing through the coil 190.

At this time, the bobbin 150 can be elastically supported by the upper and lower elastic members 410 and 420 as described above. At this time, the moving distance of the bobbin 150 in the first direction (e.g., the Z-axis direction) can be precisely controlled by precisely adjusting the amount of current applied to the coil 190. [

9A and 9B show cross-sectional views of the lens driving apparatus of the conventional and the embodiments, respectively. 9A, in the case of the conventional lens driving apparatus, the coil 90 is directly wound on the outer circumferential surface 56 of the bobbin 50, or the coil 90 is wound on the outer peripheral surface 56 of the bobbin 50 (Not shown). Thus, when the coil 90 is directly wound on the bobbin 50, after the winding of the coil 90, a change in the lens assembly torque may occur.

9B, in the case of the lens driving apparatus according to the embodiment, since the coil 190 is wound on the outer circumferential surface 184 of the winding ring 180, the heat or tension generated at the time of winding It is possible to prevent deformation of the bobbin 150 due to the rotation of the bobbin 150, thereby preventing changes in the lens assembly torque.

9A, since the coil 90 is directly wound on the outer circumferential surface 56 of the bobbin 50 in the conventional lens driving apparatus, the foreign matter 12 is supplied from the outside to the coil 90 and the first magnet (500).

9B, in the case of the lens driving apparatus according to the embodiment, the inner circumferential surface 182 of the winding ring 180 and the outer circumferential surface 156 of the bobbin 150 may be spaced apart by a constant distance d . A part 14 of the foreign matter 12 can be introduced into the space in which the constant distance d is formed and only the remainder 16 of the foreign matter 12 can flow into the coil 190 And the first magnet 500. In this case,

9A, the amount of the foreign matter 16 flowing into the void space between the coil 190 and the first magnet 500 can be significantly reduced. As a result, the magnetic field between the coil 190 and the first magnet 500 is less affected by the foreign matter 12, so that the rise and fall of the bobbin 150 can be controlled more accurately than before. For this, for example, the first distance d may be between 0.05 mm and 0.5 mm, but the embodiment is not limited to this.

10 is a view showing the inside of a lens driving apparatus according to an embodiment. 11A is a cross-sectional view of a lens driving apparatus according to an embodiment. 11B is an enlarged view showing a part of FIG.

In the embodiment, the yoke 210, which shields the magnetic field and limits external leakage of the magnetic field, is integrally formed with the cover member on the upper inner circumferential surface of the cover member. At this time, the cover member 200 mainly shields the magnetic field leaking from the upper surface and the outer surface of the cover member 200, and the yoke 210 can mainly shield the magnetic field leaking toward the inner circumferential surface.

In the embodiment, the yoke 210 is circular in cross section in the first direction, but may be formed in a polygonal shape. The winding ring 180 and the coil may be circular or polygonal in cross section corresponding to the circular or polygonal shape of the yoke 210.

At this time, since the outer surface of the yoke 210 and the inner surface of the cover member 200 are spaced apart from each other by a predetermined distance, a receiving portion 220 is formed therebetween. That is, the accommodating portion 220 is a space formed between the yoke 210 and the cover member 200. The accommodating portion 220 is formed in a shape in which the upper end is closed and the lower end is opened, and is formed in the circumferential direction of the yoke 210. Further, unlike the embodiment, there may be only a cover member without a separate yoke 210. [

The receiving portion 220 may receive the winding ring 180 and / or at least a portion of the coil. A second magnet 310 coupled to the bobbin 150 and a position sensing sensor disposed at a position facing the second magnet 310 are installed in the accommodating portion 220 at least partially .

The first magnet 500 may be provided at least one distance apart from the second magnet 310 in the circumferential direction of the winding ring 180. The first magnet 500 is provided in a pair such that the second magnet 310 and the position sensing sensor 320 are opposed to each other at the corners located on the corners of the accommodating portion 220 .

At this time, the first magnet 500 may be formed in a trapezoidal shape corresponding to the corners of the receiving portion 220, but not limited thereto, and may be formed in a polygonal shape such as a triangular shape. This trapezoidal shape may also minimize magnetic field leakage from the corners of the cover member 200 to the outside.

The arrangement structure of the first magnet 500, the second magnet 310 and the position sensing sensor 320 in the accommodating portion 220 is an optimized arrangement structure considering the shape of the accommodating portion 220 of the embodiment. However, the first magnet 500, the second magnet 310, the position sensing sensor 320, and the like may be disposed in the accommodating portion 220 in a different manner, not limited to the above arrangement.

For example, the first magnet 500 may be arranged in a total of four or eight such that the first magnet 500 is opposed to the corner portion of the receiving portion 220, and the shape of the first magnet 500 is not a trapezoid, Or may have a cubic shape. This arrangement structure may also vary depending on the shapes of the cover member 200 and the yoke 210. [

In the embodiment, when the integral type yoke 210 having the above-described structure is used, the amount of foreign matter introduced into the upper end of the lens driving apparatus can be significantly reduced. That is, since the yoke 210 closes at least a part of the space formed between the upper portion of the bobbin 150 and the winding ring 180, the path through which foreign substances are introduced becomes complicated, The amount can be significantly reduced.

In the embodiment, the outer surface of the yoke 210 and the inner surface of the winding ring 180 are provided at the accommodating portion 220 so as to correspond to each other at a constant distance l. The spacing distance l effectively corresponds to the tilt generated when the bobbin 150 moves in the first direction.

This tilting phenomenon is caused by the fact that the electromagnetic force applied to the bobbin 150 is biased or the bobbin 150 is not moved in the first direction and is inclined in the second and / In the direction of movement.

Even if a tilting phenomenon occurs, the movement of the bobbin 150 in the first direction is limited or unnatural due to the friction generated due to excessive contact between the winding ring 180 and the yoke 210 Can be prevented. In addition, wear or breakage of the bobbin 150 and / or the winding ring 180 due to such friction can be significantly reduced.

The flexible printed circuit board 600 will be described in detail with reference to FIGS. 1, 10, and the like. The flexible circuit board 600 is provided below the mover 100 and is electrically connected to the coil 190. The flexible circuit board 600 is deformed in the first direction corresponding to the first direction movement of the mover 100, Is formed of a flexible material.

Also, unlike the embodiment, the lens driving device is electrically connected to the coil 190 to supply electric power to the coil 190 and to support the bobbin 150 in the first direction in a resilient or elastic manner And an elastic member provided on the upper and lower portions of the bobbin 150.

The displacement of the bobbin 150 in the first direction may be detected by the displacement detecting unit 300 and the first and second displacement detecting units 300 and 300. [ Controlled by an external control driver (not shown).

Therefore, in the embodiment, since the elastic member used in a general lens driving apparatus is not used, the structure of the lens driving apparatus can be simplified.

11A, the flexible printed circuit board 600 has one side coupled to the lower portion of the bobbin 150 and the other side coupled to the upper portion of the base 700. As shown in FIG. The flexible printed circuit board 600 has a first protrusion 151 formed on the lower end of the bobbin 150 and a second protrusion 710 formed on the base 700 on the other side. Lt; / RTI >

A protrusion may be formed on both sides of the flexible printed circuit board 600 and recessed grooves or holes may be formed in the lower end of the bobbin 150 and the base 700 so that the flexible printed circuit board 600 is fixed to the bobbin 150 and the base 700, respectively. As another example, the flexible printed circuit board 600 may be bonded to the bobbin 150 and the base 700 by a conductive adhesive or a general epoxy.

The flexible circuit board 600 may be disposed between the bobbin 150 and the base 700 in a second direction and / or a third direction perpendicular to the first direction. When the bobbin 150 is moved in the first direction, for example, the flexible printed circuit board 600 is lifted up to the bobbin 150, And the area joined with it also falls.

On the other hand, in the embodiment, the vibration generated by the elastic member and the mechanical resonance phenomenon caused thereby can be avoided by replacing the upper and lower elastic members with the flexible circuit board 600, and the noise generated by the elastic members and the like can be remarkably There is an effect that can be reduced.

In addition, according to the embodiment, the upper and lower elastic members, the housing, and the first magnet used in the general lens driving apparatus can be eliminated, thereby reducing cost and simplifying the process in the lens driving apparatus. It is effective. Also, the first magnet may be composed of four.

The flexible circuit board 600 may further include a second circuit board 610 attached to one side of the base 700 and / or the cover member 200 and electrically connected to the flexible circuit board 600. The second circuit board 610 electrically connects the flexible circuit board 600 to the external control driver.

At this time, the second circuit board 610 may be formed of a flexible material similar to the flexible circuit board 600, but may be formed of a rigid material. The second circuit board 610 may be formed of a flexible material or a solid material in consideration of the structure of the entire lens driving apparatus, the easiness of manufacturing the second circuit board 610, the manufacturing cost, and the like.

12A and 12B are a perspective view and a bottom perspective view showing the cover member 200 of the embodiment. The cover member 200 of the embodiment is formed in a hollow shape, and the outer shape of the cover member 200 is formed into a substantially rectangular shape. Specifically, the corner portion is formed in a rounded shape. However, the corner portion of the cover member 200 may be formed in a straight line, and may have an octagonal shape as a whole.

A hollow yoke 210 for limiting leakage of a magnetic field is formed integrally with the cover member 200 on the upper inner circumferential surface of the cover member 200 and the outer surface of the yoke 210 and the outer surface of the cover member 200 The inner side surface is spaced a certain distance to form the receiving portion 220.

As described above, at least a portion of the winding ring 180 and / or the coil 190 may be received in the receiving portion 220. The housing 220 includes a first magnet 500 coupled to the bobbin 150 and a second magnet 310 coupled to the bobbin 150 and a position sensor 320 disposed at a position opposite the second magnet 310 At least in part.

The second magnet 310 and the position sensing sensor 320 are disposed at positions opposite to each other in the vicinity of the corner of the accommodating portion 220. In this embodiment, May be provided at corner portions.

The configuration of the accommodating portion 220 is optimized to the shape of the cover member 200 of the embodiment, but the present invention is not limited thereto. The shape and the number of the first magnet 500, the shape of the cover member 200, In other embodiments in which the shapes of the yoke 210 and the like are changed, various modifications may be applied.

13 is a perspective view showing a modified embodiment of the winding ring 180 of the embodiment. In the embodiment, the rotation preventing portion 181 for preventing the rotation of the winding ring 180 may be provided at the upper end of the winding ring 180. 4 to 8, the rotation preventing portion 181 may be provided in each of the embodiments of the winding ring 180 described above.

The rotation preventing portion 181 may have at least one bent portion at the upper end of the winding ring 180 and an end portion linearly corresponding to the inner side surface of the cover member 200 at least partially formed in a plane.

Specifically, the rotation preventing portions 181 are provided in at least one pair, and are provided at positions facing each other. The rotation preventing portions 181 are formed in the inner surface of the cover member 200, May be provided symmetrically or radially at the top of the ring 180.

In the embodiment, four rotation preventing portions 181 are formed at the upper end of the winding ring 180 so as to be radially bent, but two anti-rotation portions 181 facing each other may be formed. Further, when the cover member 200 is formed into an octagonal shape, the rotation preventing portions 181 may be formed symmetrically or two, four, or eight in a radial direction. In addition, the number of rotation preventing portions 181 may be an odd number. In addition, a plurality of rotation preventing portions 181 corresponding to one portion of the inner side surface of the cover member 200 may be provided.

When the lens barrel is rotated to fasten the lens barrel or the like to the thread in the assembling process of the lens driving device, the rotation preventing portion 181 contacts at least a part of the inner surface of the cover member 200, So that it is possible to remarkably reduce the occurrence of an assembling failure.

14 is a schematic view showing embodiments of the flexible printed circuit board 600 of the embodiment. The flexible printed circuit board 600 can be formed in various shapes as long as one side of the flexible circuit board 600 is coupled to the lower portion of the bobbin 150 and the other side thereof is coupled to the upper portion of the base 700 to supply power to the coil 190 . However, the flexible printed circuit board 600 is preferably positioned at the edges of the bobbin 150 and the base 700 so as not to block the field of view of an image sensor (not shown) provided below the lens driving device.

As an embodiment of the flexible circuit board 600, a crescent shape may be provided, one side of which is coupled to the bobbin 150 and the other side of which is coupled to the base 700 (a). As another embodiment of the flexible circuit board 600, an opening may be formed in a horseshoe shape (b). As another embodiment of the flexible printed circuit board 600, the flexible circuit board 600 may be provided with a closed curve formed with a hollow (c). As another embodiment of the flexible printed circuit board 600, a plurality of the crescent-shaped flexible printed circuit boards 600 may be provided on the lower side of the mover 100 so as to be symmetrical with respect to each other in the first direction (d).

The flexible printed circuit board 600 and the bobbin 150 and the base 700 are formed with the coupling holes 610 for coupling with the bobbin 150 or the base 700. However, There may be no coupling hole 610 or a protruding portion or a recessed groove instead of the coupling hole 610 depending on the coupling method with the base 700. [

The displacement sensing unit 300 will be described in detail with reference to FIGS. 1, 10, and the like.

The displacement sensing unit 300 may determine a displacement value of the bobbin 150 in the first direction and may include a second magnet 310 and a position sensing sensor 320.

The second magnet 310 is installed in the bobbin 150 of the mover 100 and the position sensing sensor 320 is provided in the cover member 200 and at a position corresponding to the second magnet 310, And the second magnet 310 are spaced apart from each other by a predetermined distance.

The position sensing sensor 320 may be a displacement sensing unit 300 for determining a displacement value of the bobbin 150 in the first direction together with a second magnet 310 installed on the bobbin 150 . For this, the position sensing sensor 320 is disposed at a position corresponding to the position of the second magnet 310.

The position sensing sensor 320 may be a sensor for sensing a change in magnetic force emitted from the second magnet 310 of the bobbin 150. Also, the position sensor 320 may be a Hall sensor. However, the present embodiment is not limited to the Hall sensor, and any sensor that can detect a change in magnetic force can be used, and a sensor capable of detecting a position in addition to the magnetic force is also possible. For example, It is also possible to use a reflector or the like.

A second circuit board 610 electrically connected to the coil 190 through the flexible printed circuit board 600 and an image sensor are electrically connected to the control driver provided outside the lens driving device, Lt; / RTI > According to this connection method, the movement of the bobbin 150 in the first direction is controlled by the control driver in a feedback or closed loop manner.

The movement of the bobbin 150 in the first direction is for auto focusing, that is, for automatically focusing the image of the object on the image sensor surface. The feedback control by the control driver for autofocusing is performed as follows.

The control driver receives the first displacement value of the bobbin 150 measured by the displacement detector 300 and the image of the object imaged on the image sensor and determines whether the focus of the object is appropriate. When the focus of the subject is not appropriate, the amount of current supplied to the bobbin 150 is changed to move the bobbin 150 in the first direction, and the control driver receives the first direction displacement value and the image of the subject again, It is judged to be inappropriate.

By repeating this process, the control driver finds the proper focus of the subject. As a result, the control driver repeatedly adjusts the first direction displacement value of the bobbin 150 to perform autofocusing, and this process proceeds in a feedback control manner as described above.

Meanwhile, the camera module including the lens driving device may include a cover member 200, a bobbin 150, a lens barrel, a flexible circuit board 600, an image sensor, and a printed circuit board.

The cover member 200 is formed in a hollow shape, and as described above, the yoke 210 that shields the magnetic field can be integrally formed. The bobbin 150 may be provided inside the cover member and movable in a first direction by an electromagnetic interaction. The lens barrel may be coupled to the inside of the bobbin, and the coupling method may be threaded or other various combinations as described above. The flexible circuit board 600 is provided below the bobbin 150 and is electrically connected to the coil 190 coupled to the bobbin 150 as described above. The image sensor is provided at a lower portion of the base 700, and an image of an object incident through the lens barrel is imaged. The printed circuit board is electrically connected to the image sensor, and image information of the object acquired from the image sensor can be received.

The embodiment uses a closed loop control method instead of the open loop control using the upper and lower elastic members in a general lens driving apparatus, so that the auto focusing can be performed accurately and quickly.

In addition, since the upper side spring is not used in the embodiment, the height adjustment of the upper surface of the bobbin 150 is relatively free, so that the bonding operation is facilitated when the lens or the lens barrel is assembled to the bobbin 150.

Since the coil 190 is wound around the bobbin 150 and the bobbin 150 by the heat or tension generated during the winding of the coil 190, Can be remarkably reduced, and the change of the lens assembly torque can be remarkably reduced.

Meanwhile, the lens driving apparatus according to the above-described embodiments can be used in various fields, for example, a camera module. For example, the camera module can be applied to a mobile device such as a mobile phone.

The camera module according to the embodiment may include a lens barrel coupled to the bobbin 150, an image sensor (not shown), a printed circuit board (not shown), and an optical system.

The lens barrel is as described above, and the printed circuit board can form the bottom surface of the camera module from the portion where the image sensor is mounted.

Further, the optical system may include at least one or more lenses that transmit images to the image sensor. At this time, the optical system may be provided with an actuator module capable of performing autofocusing function and camera-shake correction function. Actuator modules that perform autofocusing can be configured in various ways, and a voice coil unit motor is generally used. The lens driving apparatus according to the above-described embodiment can perform the role of an actuator module that performs both the auto focusing function and the camera shake correction function.

In addition, the camera module may further include an infrared cut filter (not shown). The infrared cut filter serves to block the infrared light from entering the image sensor. In this case, in the base 700 illustrated in FIG. 1, an infrared cutoff filter may be installed at a position corresponding to the image sensor, and may be combined with a holder member (not shown). Further, the base 700 can support the lower side of the holder member.

A separate terminal member may be provided in the base 700 for energizing the printed circuit board, or a terminal may be integrally formed using a surface electrode or the like. Meanwhile, the base 700 may function as a sensor holder for protecting the image sensor. In this case, a protrusion may be formed downward along the side surface of the base 700. However, this is not essential, and although not shown, a separate sensor holder may be disposed below the base 700 to perform its role.

While only a few have been described above with respect to the embodiments, various other forms of implementation are possible. The technical contents of the embodiments described above may be combined in various forms other than mutually incompatible technologies, and may be implemented in a new embodiment through the same.

100: mover
150: Bobbin
151: first protrusion
180: winding ring
181:
190: Coil
200: cover member
210: York
220:
300: Displacement sensing unit
310: second magnet
320: Position sensor
500: first magnet
600: Flexible circuit board
610: Coupling hole
610: second circuit board
700: Base
710: second protrusion

Claims (20)

A hollow cover member;
A bobbin provided in the cover member and movable in a first direction by an electromagnetic interaction;
A first magnet disposed on the cover member and moving the bobbin;
And a flexible circuit board provided below the bobbin and electrically connected to a coil coupled to the bobbin. The method according to claim 1,
Wherein the bobbin is provided with at least one lens therein, a winding ring is coupled to an outer circumferential surface of the bobbin, the coil is wound on an outer circumferential surface of the winding ring, and the first and second magnets are electromagnetically interacted with each other, And the second lens unit is moved in one direction. 3. The method of claim 2,
And a base coupled to a lower end of the cover member,
The flexible printed circuit board,
Wherein one side is coupled to a lower portion of the bobbin, and the other side is coupled to an upper portion of the base. The method of claim 3,
Further comprising a second circuit board attached to one side of the base and / or the cover member and electrically connected to the flexible circuit board. The method of claim 3,
The flexible printed circuit board,
Wherein one side is coupled to a first projection formed on a lower end of the bobbin and the other side is coupled to a second projection formed on the base. 3. The method of claim 2,
And the coil is coupled to the winding ring by bonding or insert injection. 3. The method of claim 2,
And a displacement detection unit for determining a displacement value of the bobbin moving in the first direction,
The displacement sensing unit may include:
A second magnet coupled to the bobbin; And
And a position sensor disposed inside the cover member and having a predetermined distance from the second magnet at a position corresponding to the second magnet. 8. The method of claim 7,
The first magnet may include:
Wherein at least one of the first and second magnets is spaced apart from the second magnet by a predetermined distance in the circumferential direction of the winding ring. 8. The method of claim 7,
The cover member is formed in a rectangular shape in side view in the first direction, and the position detecting sensor is provided at an edge of the cover member, and the first magnet has a corner where the position detecting sensor is provided, Wherein at least one lens unit is provided in the cover member at an edge other than an opposite corner. 10. The method of claim 9,
The first magnet may include:
Wherein the cover member is provided inside a corner of the cover member facing each other. 10. The method of claim 9,
Wherein the winding ring is coupled with the bobbin so as to surround at least a part of the bobbin, and the coil is provided so as to surround the outer circumferential surface of the winding ring. 10. The method of claim 9,
The winding ring
And a rotation preventing portion for preventing the rotation of the winding ring is provided at an upper end of the rotation preventing portion. 13. The method of claim 12,
The rotation-
Wherein at least one end portion of the cover ring is linearly bent so as to correspond to an inner side surface of the cover member at least partially bent at an upper end portion of the winding ring and provided at least partially in a plane. 14. The method of claim 13,
The rotation-
Characterized in that at least one pair of the lens driving means is provided symmetrically or radially with respect to the upper end of the winding ring so as to correspond to each of the inner side surfaces of the cover member, Device. The method according to claim 1,
The flexible printed circuit board,
And the second lens group is arranged in a second direction and / or a third direction whose longitudinal direction is perpendicular to the first direction. 3. The method of claim 2,
The cover member is formed with a hollow yoke for restricting leakage of a magnetic field to an upper inner circumferential surface thereof,
Wherein the yoke has a circular or polygonal cross-section as viewed in the first direction, and the winding ring and the coil are formed to have a circular or polygonal cross-section corresponding to the shape of the yoke. 17. The method of claim 16,
And a receiving portion formed between the yoke and the cover member such that an outer surface of the yoke and an inner surface of the cover member are spaced apart from each other by a predetermined distance. 18. The method of claim 17,
The receiving portion includes:
Wherein the upper end of the yoke is closed and the lower end thereof is opened, and is formed in the circumferential direction of the yoke. 18. The method of claim 17,
The receiving portion includes:
Wherein at least a part of the winding ring and / or the coil is accommodated, and the outer surface of the yoke and the inner surface of the winding ring correspond to each other with a constant separation distance. Image sensor;
A printed circuit board on which the image sensor is mounted; And
A camera module comprising the lens driving device according to any one of claims 1 to 19.

Images