KR102220503B1 - Lens moving unit - Google Patents

Abstract

In an embodiment, a housing supporting a first magnet, a first coil is installed on an outer circumferential surface, and a bobbin moving in a direction parallel to the optical axis inside the housing due to electromagnetic interaction between the first magnet and the first coil , Upper and lower elastic members coupled to the bobbin and the housing, a first circuit board electrically connected to the upper elastic member, a second circuit board disposed under the housing, and disposed on the second circuit board A second coil, an elastic support member electrically connecting the first circuit board and the second circuit board, or electrically connecting the elastic member and the second circuit board, and the elastic support member and the first circuit board And a first damper provided in the electrically connected portion.

Description

Lens driving unit {LENS MOVING UNIT}

The embodiment relates to a lens driving device.

A mobile phone or smartphone equipped with a camera module that captures a subject and stores it as an image or video is being developed. In general, the camera module may include a lens, an image sensor module, and a voice coil motor (VCM) that adjusts a distance between the lens and the image sensor module.

While photographing a subject, the camera module may slightly shake due to the user's hand shake, and a desired image or video cannot be captured due to such hand shake.

In order to correct the distortion of an image or video caused by the user's hand shake, a voice coil motor to which an optical image stabilizer (OIS) function is added has been developed.

An embodiment provides a lens driving device capable of accurately grasping and controlling a position of a lens, and a camera module including the same.

A lens driving apparatus according to an embodiment includes a housing for supporting a first magnet; A bobbin having a first coil installed on an outer circumferential surface thereof and moving in a direction parallel to an optical axis in the housing by an electromagnetic interaction between the first magnet and the first coil; Upper and lower elastic members coupled to the bobbin and the housing; A first circuit board electrically connected to the upper elastic member; A second circuit board disposed under the housing; A second coil disposed on the second circuit board; An elastic support member electrically connecting the first circuit board and the second circuit board, or electrically connecting the elastic member and the second circuit board; And a first damper provided at a portion where the elastic support member and the first circuit board are electrically connected.

The embodiment may further include a second damper provided at a portion where the elastic support member and the second circuit board are electrically connected to each other.

The housing includes an upper end portion on which the first circuit board is disposed; A plurality of support portions connected to a lower surface of the upper end portion and supporting the first coil; And a through groove formed at a corner of the upper end, and the support member may pass through the through groove.

The embodiment may further include a third damper provided between the through hole of the housing and the elastic support member.

The upper elastic member includes a first inner frame connected to an upper portion of the bobbin; A first outer frame connected to an upper portion of the housing; And a first connection part connecting the first inner frame and the first outer frame, and the embodiment may further include a fourth damper provided between the first inner frame of the upper elastic member and the housing. .

The lower elastic member may include a second inner frame connected to a lower portion of the bobbin; A second outer frame connected to the lower portion of the housing; And a second connection part connecting the second inner frame and the second outer frame, and the embodiment may further include a fifth damper provided between the second inner frame of the lower elastic member and the housing. .

A lens driving device according to another exemplary embodiment includes a housing supporting a first magnet; At least one lens is mounted, a first coil is installed on an outer circumferential surface, and a bobbin moves in a direction parallel to the optical axis inside the housing by electromagnetic interaction between the first magnet and the first coil ; A second magnet disposed on the outer peripheral surface of the bobbin; A first position sensor configured to sense a change in magnetic force of the second magnet to detect a position of the bobbin in a direction parallel to the optical axis; Upper and lower elastic members coupled to the bobbin and the housing; A first circuit board electrically connected to the upper elastic member; A second circuit board disposed under the housing; A second coil disposed on the second circuit board; And an elastic support member electrically connecting the first circuit board and the second circuit board, or electrically connecting the elastic member and the second circuit board, wherein the second magnet is perpendicular to the optical axis direction. It has a magnetization direction in which opposite polarities are disposed based on a plane, and is an anode magnetized magnet disposed to face the first position sensor.

The second magnet may include a first side surface facing the first position sensor and having a first polarity; And a second side facing the first position sensor and spaced apart from the first side in a direction parallel to the direction of the optical axis, and having a second polarity opposite to the first side, and the first side The length in the optical axis direction of may be greater than or equal to the length of the second side surface in the optical axis direction.

The second magnet may include first and second sensing magnets disposed to be spaced apart from each other; And a non-magnetic barrier wall disposed between the first and the first sensing magnets.

The first and second sensing magnets may be disposed to be spaced apart from each other in a direction parallel to the optical axis direction.

The first and second sensing magnets may be disposed to be spaced apart from each other in the magnetization direction.

The first side may be located on the second side.

The second side may be located on the first side.

In the initial state before the lens is moved in the optical axis direction, the height of the middle of the first position sensor is equal to the height of the virtual horizontal plane extending in the magnetization direction from the upper end of the first side surface or the virtual horizontal plane Can be higher.

Initially before the lens is moved in the direction of the optical axis, the height of the middle of the first position sensor may coincide with the first point of the first side in the magnetization direction.

Initially before the lens is moved in the direction of the optical axis, the height of the middle of the first position sensor may coincide with the nonmagnetic barrier wall in the magnetization direction.

Initially before the lens is moved in the optical axis direction, a height of the middle of the first position sensor may coincide with a second point higher than the first point in the magnetization direction.

Initially before the lens is moved in the direction of the optical axis, a height of the middle of the first position sensor may coincide with the second side surface.

At a position where the lens is moved the highest in the optical axis direction, a height of the middle of the first position sensor may coincide with a point below the lower end of the second side surface.

The first point may correspond to an intermediate height of the first side.

The nonmagnetic partition wall may include a void or a nonmagnetic material.

The length of the nonmagnetic barrier rib may be 10% or more or 50% or less of the length of the second magnet in a direction parallel to the optical axis direction.

The length of the second magnet in a direction parallel to the direction of the optical axis may be at least 1.5 times the movable width of the bobbin.

The height of the middle of the first position sensor may be skewed toward one of the first and second side surfaces.

The first circuit board and the upper elastic member may be integrally formed.

The camera module according to the embodiment includes an image sensor; A circuit board on which the image sensor is mounted; And the lens driving device according to any one of claims 7 to 24.

The camera module includes a focus control unit configured to perform an autofocus function by controlling the interaction between the first coil and the first magnet based on subject information and moving the bobbin by a first movement amount in a direction parallel to the optical axis. It may contain more.

The subject information may include at least one of a distance between a subject and the lens, a location of the subject, and a phase of the subject.

The focus control unit includes an information acquisition unit that obtains the subject information; A bobbin position search unit for finding a position of the bobbin that is in focus corresponding to the acquired subject information; And a movement amount adjusting unit moving the bobbin to the found position by the first movement amount.

The bobbin position search unit may include a look-up table for mapping and storing the position of the bobbin that is in focus corresponding to the subject information; And a data extracting unit that extracts a location of the bobbin that is in focus corresponding to the acquired subject information from the look-up table.

The look-up table may be generated using the first position sensor before moving the bobbin by the first movement amount.

The focus control unit moves the bobbin by the first movement amount and then moves the bobbin within a range of a second movement amount smaller than the first movement amount to display the largest value among the frequency modulation transfer function values. You can find the location.

A direction in which the bobbin is moved by the second movement amount may be the same direction as a direction in which the bobbin is moved by the first movement amount.

A direction in which the bobbin is moved by the second movement amount may be a direction opposite to a direction in which the bobbin is moved by the first movement amount.

According to an embodiment, by disposing a displacement sensor and an anode magnetized magnet to detect a magnetic field having a linearly varying intensity, movement of the lens in the optical axis direction may be accurately detected.

1 is a schematic perspective view of a lens driving apparatus according to an embodiment.
2 is an exploded perspective view of the lens driving apparatus shown in FIG. 1.
3 is a perspective view illustrating a lens driving apparatus of FIG. 1 with a cover member removed.
4 shows a perspective view of the bobbin shown in FIG. 2.
5 shows a first perspective view of the housing shown in FIG. 2.
6 shows a second perspective view of the housing shown in FIG. 2.
7 is a rear perspective view of a housing in which a bobbin and a lower elastic member are combined
8 shows a plan view of the upper elastic member shown in FIG. 2.
9 is a perspective view of a first upper elastic member and a second upper elastic member mounted on the bobbin and the housing.
10 is an enlarged perspective view of portion A shown in FIG. 3.
FIG. 11 is a perspective view of a base, a circuit board, and a second coil shown in FIG. 2.
12 is an exploded perspective view of the base, the circuit board, and the second coil shown in FIG. 11.
13 is a plan view showing an electrical connection between a second coil and a circuit board.
14 is an exploded perspective view of the base, the second circuit board, and the second coil shown in FIG. 2.
15 shows a perspective view of the first circuit board shown in FIG. 2.
16 is an AB cross-sectional view of the lens driving apparatus shown in FIG. 3.
17 is a CD cross-sectional view of the lens driving apparatus shown in FIG. 3.
18 is a plan view of a lens driving apparatus according to another exemplary embodiment.
19 is a perspective view of the lens driving apparatus shown in FIG. 18.
20 is a plan view of a lens driving apparatus according to another embodiment.
21 is a perspective view of the lens driving device shown in FIG. 20.
22A is a perspective view of a lens driving apparatus according to another embodiment.
22B is a perspective view of a lens driving apparatus according to another embodiment.
23 is a conceptual diagram illustrating auto focusing and camera shake correction of a lens driving apparatus according to an embodiment.
24 shows the moving direction of the movable part according to the control of the second coils according to the first embodiment.
25 shows a moving direction of a movable unit according to control of second coils according to the second embodiment.
26 shows the position of the movable part according to the intensity of the current applied to the first coil.
FIG. 27A is a block diagram showing a configuration of a focus control unit 400 according to an embodiment, and FIG. 27B is a flowchart according to an embodiment of an auto focus control method performed by the focus control unit 400 shown in FIG. 27A.
28A and 28B are graphs for explaining an auto focus function according to a comparative example,
29A and 29B are graphs for explaining an autofocus function according to an embodiment
30A and 30B are graphs for explaining fine adjustment in an autofocus function according to an embodiment.
FIG. 31 is a flowchart according to another embodiment of an automatic focus control method performed by the focus controller illustrated in FIG. 27.
32 is a schematic cross-sectional view of a lens driving apparatus according to another embodiment.
33A and 33B are cross-sectional views of the anode magnetized magnet shown in FIG. 32 according to embodiments.
34 is a graph for explaining the operation of the lens driving apparatus shown in FIG. 32
FIG. 35 is a graph showing the movement of the lens driving apparatus shown in FIG. 32 in the optical axis direction, and FIG. 36 is a graph showing the displacement of the moving part according to the current supplied to the first coil in the lens driving apparatus according to the embodiment.
37 is a cross-sectional view of a lens driving apparatus according to another embodiment.
38 is a cross-sectional view of a lens driving apparatus according to another embodiment.
39A and 39B are cross-sectional views, respectively, according to embodiments of the anode magnetized magnet shown in FIG. 38.
40 is a cross-sectional view of a lens driving apparatus according to another embodiment.
41 is a cross-sectional view of a lens driving apparatus according to another embodiment.
42 is a cross-sectional view of a lens driving apparatus according to another embodiment.
43 is a graph showing displacement of a moving part according to a current supplied to a first coil in the lens driving apparatus illustrated in FIGS. 41 and 42.
44 is a graph showing the strength of a magnetic field (or output voltage) sensed by the first position sensor according to a moving distance in the direction of the optical axis of the moving unit, for each appearance of the first position sensor and the anode magnetized magnet facing each other.
45A and 45B are graphs showing displacement of a magnetic field by intensity detected by the first position sensor.
46 is a graph for explaining a change in intensity of a magnetic field according to a moving distance of a moving part of a lens driving apparatus according to a comparative example.
47 is a graph showing a change in a magnetic field detected by a position sensor according to a movement of a moving unit in a lens driving apparatus according to an embodiment.

Hereinafter, embodiments will be clearly revealed through the accompanying drawings and descriptions of the embodiments. In the description of the embodiment, each layer (film), region, pattern, or structure is "on" or "under" of the substrate, each layer (film), region, pad or patterns. In the case of being described as being formed in, "on" and "under" include both "directly" or "indirectly" formed do. In addition, the standards for the top/top or bottom/bottom of each layer will be described based on the drawings.

In the drawings, the sizes are exaggerated, omitted, or schematically illustrated for convenience and clarity of description. Also, the size of each component does not fully reflect the actual size. Also, the same reference numerals denote the same elements throughout the description of the drawings.

An image stabilization device applied to a small camera module of a mobile device such as a smartphone or tablet PC is designed to prevent the outlining of the captured image from being clearly formed due to vibration caused by the user's hand shake when shooting a still image. It means a configured device.

In addition, the auto-focusing device is a device that automatically images the focus of an image of a subject on an image sensor surface. Such an image stabilization device and an auto-focusing device can be configured in various ways.In the case of an embodiment, an optical module composed of a plurality of lenses is moved in the optical axis direction or in a direction parallel to the optical axis, or horizontally or vertically with respect to the optical axis. By moving with respect to the human face, such an auto-focusing operation and a camera shake correction operation may be performed.

1 is a schematic perspective view of a lens driving apparatus 10 according to an embodiment, FIG. 2 is an exploded perspective view of the lens driving apparatus 10 shown in FIG. 1, and FIG. 3 is a lens driving apparatus of FIG. 10) shows a perspective view with the cover member 300 removed, FIG. 4 is a plan view of the lens driving apparatus 10 shown in FIG. 3, and FIG. 16 is an AB cross-sectional view of the lens driving apparatus shown in FIG. 3, 17 is a CD cross-sectional view of the lens driving apparatus shown in FIG. 3.

In FIGS. 1 to 21, a Cartesian coordinate system (x, y, z) may be used. In the drawing, the xy plane consisting of the x-axis and y-axis means a plane perpendicular to the optical axis. For convenience, the optical axis direction (z-axis direction) is the first direction, the x-axis direction is the second direction, and the y-axis direction is the third direction. Can be defined as

1 to 3, and 16 and 17, the lens driving device 10 of the embodiment includes a cover member 300, an upper elastic member 150, a bobbin 110, a first coil 120, and The housing 140, the first magnet 130, the second magnet 185, the lower elastic member 160, the elastic support members 220a to 220d, the first position sensor 190, the second coil 230, A second circuit board 250, a base 210, and second and third position sensors 240a and 240b are included.

The bobbin 110, the first coil 120, the first magnet 130, the housing 140, the upper elastic member 150, and the lower elastic member 160 may form a first lens driving unit. A first position sensor 180 may be further included. The first lens driving unit may be for auto focus.

In addition, the first lens driving unit may form the second lens driving unit 200, the second coil 230, the second circuit board 250, the base 210, and the elastic support members 220a to 220d, In addition, it may further include second and third position sensors (240a, 240b). The second lens driving unit 200 may be for camera shake correction.

First, the cover member 300 will be described.

The cover member 300 includes an upper elastic member 150, a bobbin 110, a first coil 120, a housing 140, a first magnet 130, and a second in an accommodation space formed together with the base 210. The magnet 185, the lower elastic member 160, the elastic support members 220a to 220d, the second coil 230, and the second circuit board 250 are accommodated.

The cover member 300 may have a bottom open, a box shape including an upper end and sidewalls, and a lower portion of the cover member 330 may be coupled to an upper portion of the base 210. The shape of the upper end of the cover member 300 may be a polygon, for example, a square or an octagon.

The cover member 300 may have a hollow 310 at its upper end that exposes a lens (not shown) coupled to the bobbin 110 to external light. In addition, a window made of a light-transmitting material may be additionally provided in the hollow 310 of the cover member 300 to prevent foreign substances such as dust or moisture from penetrating into the camera module.

The material of the cover member 300 may be a non-magnetic material such as SUS to prevent sticking with the first magnet 130, but may be formed of a magnetic material to function as a yoke.

Next, the bobbin 110 will be described.

The bobbin 110 is disposed on the inside of the housing 140 to be described later, and the optical axis direction or a direction parallel to the optical axis by electromagnetic interaction between the first coil 120 and the first magnet 130, for example, a first Can be moved in any direction.

Although not shown, the bobbin 110 may include a lens barrel (not shown) in which at least one lens is installed, but the lens barrel may be a configuration of a camera module to be described later, and a lens driving device ( It may not be an essential component of 10). The lens barrel may be coupled to the inside of the bobbin 110 in various ways.

5 shows a first perspective view of the bobbin 110 shown in FIG. 2, FIG. 6 shows a second perspective view of the bobbin 110 shown in FIG. 2, and FIG. 9 is an upper elastic member shown in FIG. 150), and a perspective view of the lower elastic member 160, FIG. 10 is a perspective view showing a combination of the upper elastic member 150, the second magnet 185, and the bobbin 110, and FIG. 11 is a lower elastic member ( 160) and the bobbin 110 are combined perspective views.

5, 6, and 9 to 11, the bobbin 110 may have a structure having a hollow 101 for mounting a lens or a lens barrel. The shape of the hollow 101 may be determined by the shape of the lens or lens barrel. For example, the hollow 101 may be circular, elliptical, or polygonal.

For example, the lens barrel may be coupled to the bobbin 110 by coupling a female thread 119 formed on the inner peripheral surface of the bobbin 110 and a male thread formed on the outer peripheral surface of the lens barrel. However, this is not limited thereto, and the lens barrel may be directly fixed to the inside of the bobbin 110 by a method other than screwing. Alternatively, one or more lenses may be integrally formed with the bobbin 110 without a lens barrel.

The bobbin 110 may include at least one upper support protrusion 113 formed on an upper surface, and at least one lower support protrusion 114 (see FIG. 6) formed on a lower surface.

The upper support protrusion 113 of the bobbin 110 may be coupled to the inner frame 151 of the upper elastic member 150, and thereby the bobbin 110 may be coupled and fixed to the upper elastic member 150. .

The upper support protrusion 113 of the bobbin 110 may include a central protrusion 113a, a first upper protrusion 113b, and a second upper protrusion 113c.

The first upper protrusion 113b is disposed at one side of the central protrusion 113a and spaced apart by a first distance from the central protrusion 113a, and the second upper protrusion 113c is disposed at the other side of the central protrusion 113a. It may be disposed to be spaced apart from the protrusion 113a by a second distance.

For example, the first distance and the second distance may be the same, and the first upper protrusion 113b and the second upper protrusion 113c may be symmetrically disposed with respect to the central protrusion 113a, but is limited thereto. It is not, and the upper elastic member 150 may be left and right asymmetric according to the shape of the inner frame 151.

Each of the central protrusion 113a, the first upper protrusion 113b, and the second upper protrusion 113c may have a prismatic shape, but is not limited thereto, and may be cylindrical in another embodiment.

The inner frame 151 of the upper elastic member 150 to be described later may be fitted between the central protrusion 113a and the first upper protrusion 113b, and between the central protrusion 113a and the second upper protrusion 113c. , Accordingly, the inner frame 151 may be coupled to the upper portion of the bobbin. The upper support protrusion 113 and the inner frame 151 of the bobbin 110 may be fixed to each other by heat fusion bonding or an adhesive member such as epoxy.

Even if the bobbin 110 receives a force in the direction of rotation around the optical axis, the first upper protrusion 113b and the second upper protrusion 113c can serve as a stopper preventing the bobbin 110 from rotating. have.

The number of the upper support protrusions 113 of the bobbin 110 may be plural, and may be spaced apart from each other and disposed on the upper surface of the bobbin 110.

When there are a plurality of upper support protrusions 113 of the bobbin 110, the plurality of upper support protrusions 113 of the bobbin 110 may be disposed to be spaced apart from each other so as to avoid interference with surrounding components. For example, the upper support protrusions 113 may be symmetrically arranged with respect to the virtual line passing through the center of the bobbin 110 at regular intervals. Alternatively, although the interval between the adjacent upper support protrusions 113 is not constant, the upper support protrusions 113 may be disposed to be symmetric with respect to an imaginary line passing through the center of the bobbin 110.

The lower support protrusion 114 of the bobbin 110 may have a cylindrical shape or a prism shape, and may be one or more. The lower support protrusion 114 of the bobbin 110 may be coupled to the inner frame 161 of the lower elastic member 160, and thereby the bobbin 110 may be coupled and fixed to the lower elastic member 150. .

When there are a plurality of lower support protrusions 114 of the bobbin 110, the lower support protrusions 114 of the bobbin 110 are symmetrically spaced or irregular with respect to an imaginary line passing through the center of the bobbin 110. Can be placed at intervals.

A second magnet seating groove 116 having a size corresponding to the second magnet 185 may be provided on the outer circumferential surface of the bobbin 110.

The position of the second magnet seating groove 116 may be determined according to the arrangement position of the second magnet 185 and the arrangement position of the first coil 120.

For example, when the first coil 120 is located in the first area of the outer circumferential surface of the bobbin 110, the second magnet seating groove 116 may be located in the second area of the outer circumferential surface of the bobbin 110. On the other hand, when the first coil 120 is located in the second area of the outer circumferential surface of the bobbin 110, the second magnet seating groove 116 may be located in the first area of the outer circumferential surface of the bobbin 110.

Here, the first area of the outer peripheral surface of the bobbin 110 may be an area located below the reference line of the outer peripheral surface of the bobbin 110, and the second area of the outer peripheral surface of the bobbin 110 is above the reference line of the outer peripheral surface of the bobbin 110. It may be an area located. The reference line of the outer circumferential surface of the bobbin 110 may be a line separated by a reference distance from the lower end of the outer circumferential surface of the bobbin 110, and the reference distance may be a distance that is three minutes and two of the distance between the upper and lower ends of the outer circumferential surface of the bobbin 110 have.

In the case of another embodiment in which the first coil 120 is not wound around the outer circumferential surface of the bobbin 110 in the direction of rotation around the optical axis as shown in FIG. 10, the first coil is in the form of a plurality of coil blocks In the outer circumferential surface of the bobbin 110, a coil mounting groove corresponding to a plurality of coil blocks may be provided, and each of the plurality of coil blocks may be mounted in any one of the coil mounting grooves. At this time

The coil mounting groove may be formed of a bottom and a side wall, and a part of the side wall may be opened. For example, the coil mounting groove may be in the form of a groove in which the upper sidewall is opened so that the coil block can be inserted, but is not limited thereto. In another embodiment, the coil mounting groove has a concave groove structure in which a part of the sidewall is not opened. You can have it.

When the bobbin 110 moves in the first direction, the upper side to eliminate spatial interference between the connection part 153 of the upper elastic member 150 and the bobbin 110, and to facilitate elastic deformation of the connection part 153 The upper escape groove 112 may be provided on the outer peripheral surface 110a corresponding to the connection portion 153 of the elastic member 150.

The upper escape groove 112 may be formed on the outer circumferential surface 110a of the bobbin 110 positioned between two adjacent magnet seating grooves. For example, the bobbin 110 may include four upper escape grooves 112 formed to be spaced apart from each other on an upper portion of the outer circumferential surface 110a.

In addition, when the bobbin 110 moves in the first direction, in order to eliminate spatial interference between the connection portion 163 of the lower elastic member 160 and the bobbin 110, and to facilitate elastic deformation of the connection portion 163 A lower escape groove 118 may be provided under the outer circumferential surface corresponding to the connection portion 163 of the lower elastic member 160.

The lower escape groove 118 may be formed under the outer circumferential surface 110a of the bobbin 110 positioned between two adjacent magnet mounting grooves. For example, the bobbin 110 may include four lower escape grooves 118 formed to be spaced apart from each other under the outer circumferential surface 110a.

The outer circumferential surface of the bobbin 110 may include a plurality of surfaces 115a and 115b.

For example, the outer circumferential surface of the bobbin 110 may include a plurality of first surfaces 115a and a plurality of second surfaces 115b, and each of the first surfaces 115a is two adjacent second surfaces 115b. Can be placed between. The areas of the first surfaces 115a may be the same, the areas of the second surfaces 115b may be the same, and the areas of the first surface 115a and the second surface 115b may be different.

The first surfaces 115a may be flat, and the second surfaces 115b may be convex curved surfaces from the center of the hollow of the bobbin 110 toward the outer peripheral surface of the bobbin 110.

The second surfaces 115b may be surfaces corresponding to or facing the first magnets 130-1 to 130-4 to be described later, but are not limited thereto.

The second magnet seating groove 116 may be formed on any one of the first surfaces 115a, but is not limited thereto.

Next, the second magnet 185 will be described.

The second magnet 185 may sense or determine a displacement value (or position) of the bobbin 110 in the first direction together with the first position sensor 190 to be described later. The second magnet 185 may be divided into two to increase the strength of the magnetic field, but is not limited thereto.

In a vertical direction or a direction perpendicular to the optical axis, the second magnet 185 may be disposed on the outer peripheral surface of the bobbin 110 so as not to overlap with the first coil 120.

The second magnet 185 may be disposed in the second magnet seating groove 116 formed on the outer circumferential surface of the bobbin 110, and the position of the second magnet seating groove 116 is as described above, and the second magnet 185 may not overlap with the first coil 120.

The second magnet 185 may be fixed to the second magnet mounting groove 116 by an adhesive member such as epoxy, but is not limited thereto, and the second magnet 185 is in the second magnet mounting groove 116. It can also be fitted and fixed.

In the above-described embodiment, the second magnet 185 is installed on the outer circumferential surface of the bobbin 110, and the first position sensor 190 is installed on the outer circumferential surface of the housing 140, but in other embodiments, the opposite may be made.

For example, in another embodiment, the first position sensor 190 may be disposed on the bobbin 110, and the second magnet 185 may be disposed on the housing 140. In this case, the outer peripheral surface of the bobbin 110 A surface electrode (not shown) is formed on the surface, and the first position sensor 190 may receive current through the surface electrode (not shown).

Next, the first coil 120 will be described.

The first coil 120 is disposed on the outer peripheral surface of the bobbin 110.

As described above, the first coil 120 may be disposed in the first area of the outer peripheral surface of the bobbin 110 so as not to overlap with the second magnet 185.

As shown in FIG. 10, the first coil 120 may be wound around the outer circumferential surface of the bobbin 110 in a direction rotating around an optical axis.

In another embodiment, the first coil 120 may include a plurality of coil blocks, and each of the coil blocks may have a ring shape. In this case, each of the coil blocks may be disposed on any one of the first surfaces 115a, and may be polygonal, for example, octagonal or circular. For example, in the ring shape of each of the coil blocks, at least four faces may be straight, and a corner portion connecting the four faces may be round or straight.

As shown in FIG. 10, the first coil 120 is disposed under the second magnet 185 so that the first coil 120 and the second magnet 185 do not interfere with each other or overlap in the horizontal direction. I can.

Next, the housing 140 will be described.

The housing 140 supports the first magnet 130 and accommodates the bobbin 110 therein so as to move in a first direction parallel to the optical axis.

FIG. 7 is a first perspective view of the housing 140 shown in FIG. 2, and FIG. 8 is a second perspective view of the housing 140 shown in FIG. 2.

7 and 8, the housing 140 may have a hollow column shape as a whole. For example, the housing 140 may have a polygonal (eg, quadrangle or octagonal) or circular hollow 201.

The housing 140 may include an upper end 710 having a hollow 201 and a plurality of support portions 720-1 to 720-4 connected to a lower surface of the upper end 710.

The support portions 720-1 to 720-4 are spaced apart from each other, and an opening 701 exposing the first magnet 130 mounted on the outer circumferential surface of the bobbin 110 may be formed between two adjacent support portions. have.

The upper end 710 of the housing 140 may have a rectangular shape, and the plurality of support portions 720-1 to 720-4 may be disposed to be spaced apart from each other.

The support portions 720-1 to 720-4 of the housing 140 may have a prismatic shape, but are not limited thereto.

The housing 140 may include four support portions 720-1 to 720-4, and at least one pair of the support portions may be disposed to face each other.

For example, the support portions 720-1 to 720-4 of the housing 140 may be disposed to correspond to the escape grooves 112 and 118 of the bobbin 110.

Also, for example, the support portions 720-1 to 720-4 of the housing 140 may be disposed to correspond to the first surfaces 115b of the bobbin 110.

In addition, for example, the support portions 720-1 to 720-4 of the housing 140 may be arranged to correspond to or align with each of the four corners of the upper portion 710.

The outer circumferential surface 730 of each of the support portions 720-1 to 720-4 of the housing 140 has a first side surface 730-1 parallel to the second direction and a second side surface 730- parallel to the third direction. 2), and a third side surface 730-3 disposed between the first side surface and the second side surface. Each of the first to third side surfaces 720-1 to 720-3 may be flat.

The first angle formed by the third side surface 730-3 and the first side surface 730-1 of each of the support portions 720-1 to 720-4 of the housing 140, and the third side surface 730-3 The second angle formed by the and the second side surface 720-2 may be an obtuse angle, and the first angle and the second angle may be the same.

The area of the third side surface 730-3 of each of the support portions 720-1 to 720-4 of the housing 140 is larger than the area of each of the first and second side surfaces 730-1 and 730-2. However, it is not limited thereto.

The inner circumferential surface 740 of each of the support parts 720-1 to 720-4 of the housing 140 may be a convex curved surface from the center of the hollow 201 of the housing 140 toward the outer circumferential surface 730 of the housing 140. have.

In order to allow the bobbin 110 to easily move in the first direction within the housing 140 without interference of the housing 140, the inner peripheral surfaces 740 of each of the support portions 720-1 to 720-4 of the housing 140 ) May have a curved surface corresponding or coincident with the curved surface of the outer peripheral surface of the bobbin.

In order to support the first magnet 130 to be described later, the support portions 720-1 to 720-4 of the housing 140 are stepped protruding from the lower portions of the first and second side surfaces 720-1 and 720-2 ( 731, 732) may be provided.

The housing 140 may include at least one first stopper 143 protruding from an upper surface to prevent collision with the cover member 300. That is, the first stopper 143 of the housing 140 may prevent the upper end 710 of the housing 140 from directly colliding with the inner surface of the cover member 300 when an external impact occurs.

For example, the first stopper 143 may protrude from the upper surface of the upper end 710 of the housing 140, and may be disposed corresponding to or aligned with the support portions 720-1 to 720-4 of the housing 140. have.

The number of the first stoppers 143 may be plural, and the plurality of first stoppers may be disposed to be spaced apart from each other. For example, at least a pair of first stoppers may be disposed to face each other.

The first stopper 143 may have a cylindrical or polygonal column shape, and may be divided into two or more. For example, the first stopper 143 may be divided into two, and the divided two first stoppers 143a and 143b may be disposed spaced apart by a predetermined distance. In addition, the first stopper 143 of the housing 140 may serve to guide the installation position of the upper elastic member 150.

The housing 140 may include at least one second stopper 146 protruding from the side of the upper end 710 to prevent collision with the cover member 300. That is, the second stopper 146 of the housing 140 may prevent the side surface of the upper end 710 of the housing 140 from directly colliding with the inner surface of the cover member 300 when an external impact occurs.

The housing 140 may further include at least one upper frame support protrusion 144 protruding from the upper surface of the upper end 710 for coupling with the outer frame 152 of the upper elastic member 150.

The number of the upper frame support protrusions 144 of the housing 140 may be plural, and the plurality of upper frame support protrusions 144 of the housing 140 are mutually formed on the upper surface of the upper end 710 of the housing 140. Can be placed at a distance.

For example, the upper support protrusion 144 may be spaced apart from the first stopper 143 and may be disposed adjacent to the edge of the housing 140.

In addition, the housing 140 includes at least one lower frame support protrusion 145 protruding from the bottom surface of each of the support portions 720-1 to 720-4 for coupling with the outer frame 162 of the lower elastic member 160 It can be provided.

The lower frame support protrusion 145 may have a cylindrical or polygonal column shape, and may be aligned at the center of the lower surfaces of each of the support portions 720-1 to 720-4, but is not limited thereto. In another embodiment, the number of lower frame support protrusions 145 of the housing 140 may be plural.

The upper end 710 of the housing 140 may be in contact with the hollow 201 and may include a buffer support part 741 having an upper surface and a step d1. A damper to be described later may be disposed or applied to the buffer support portion 741.

For example, the upper surface 740 of the upper end 710 of the housing 140 may include a buffer support portion 741 and an outer support portion 742, and a step difference between the buffer support portion 741 and the outer support portion 742 (d1) may exist.

The outer support part 742 is in contact with the side surface of the housing 140 and may have a shape corresponding to or coincident with the outer frame 152 of the upper elastic member 150, and the outer frame 152 of the upper elastic member 150 I can support it.

The buffer support portion 741 may have a groove shape that is recessed downward from the outer support portion 742, and may have a step d1 with the outer support portion 742.

The buffer support portion 741 is positioned corresponding to the first portion S1 corresponding to each of the support portions 720-1 to 720-4 of the housing 140, and the bent portion 151a of the upper elastic member. It may include a second part S2.

The first part S1 of the buffer support part 741 may be vertically aligned with the connection part 153 of the upper elastic member 150 and the upper escape groove 112 of the bobbin 110.

A damper may be applied between the buffer support part 741 and the connection part 153 of the upper elastic member 150 to prevent oscillation when the bobbin 110 moves.

For example, a damper may be applied on the connection part 153 of the buffer support part 741 and the upper elastic member 150.

In addition, the damper may be provided between the inner frame 151 of the upper elastic member 150 and the housing 140. Also, the damper may be provided between the inner frame 161 and the housing 140 of the lower elastic member 160.

In another embodiment, a boss (not shown) or a protrusion may be provided on the outer circumferential surface of the bobbin 110, and a damper may be applied between the boss (or protrusion) and the upper and lower elastic members 150 and 160. . Here, the reason for installing the boss (or protrusion) on the bobbin 110 is to prevent the damper from falling off due to impact or the like.

The second portion S2 of the buffer support portion 741 may include an escape groove 750 for excluding spatial interference with the bent portion 151a of the inner frame 151 of the upper elastic member 150. In order to avoid spatial interference, the length of the escape groove 750 may be equal to or longer than the length of the bent portion 151a.

The housing 140 may include a through groove 751 through which the elastic support members 220a to 220d pass through the edge of the side surface of the upper end 710.

The through groove 751 may have a groove structure that is recessed from the side of the upper end 710 of the housing 140, but is not limited thereto. In another embodiment, the upper and lower surfaces of the upper end 710 of the housing 140 It may be a hole structure penetrating the surface.

The through groove 751 may have a depth such that portions of the elastic support members 220a to 220d inserted into the through groove 751 are not exposed outside the side surface of the housing 140. The through groove 751 may serve to guide or support the elastic support members 220a to 220d.

The housing 140 may include a groove 141b for a first position sensor on a side surface of the upper end 710. The first position sensor groove 141b may have a size and shape corresponding to the first position sensor 180.

The first position sensor groove 141b formed in the housing 140 overlaps at least part of the second magnet seating groove 116 formed in the bobbin 110 and the outer peripheral surface of the housing 140 in a direction perpendicular to, Or all may not overlap.

The positional relationship between the first position sensor groove 141b and the second magnet seating groove 116 is based on the positional relationship between the first position sensor 190 and the second magnet 185, and the first position sensor 190 The positional relationship between the and the second magnet 185 will be described with reference to FIGS. 32 to 47.

For example, the first position sensor groove 141b may be formed on a side surface of the upper end 710 positioned between the support parts 720-1 to 720-4 of the housing 140.

The first position sensor 190 may detect a displacement (value) (or position) of the bobbin 110 in the first direction together with the second magnet 185. The first position sensor 190 may be disposed on the outer peripheral surface of the housing 140 so as to face the second magnet 185.

The first position sensor 190 is disposed in the first position sensor groove 141b of the housing 140. The first position sensor 190 may be electrically connected to the first circuit board 170 by soldering or soldering.

For example, the first position sensor 190 may be electrically connected to the first terminal surface 170a of the first circuit board 170.

The first position sensor 190 may be a sensor that detects a change in magnetic force emitted from the second magnet 185, and may determine a first displacement value related to a change in the position of the bobbin 110 in the first direction. . The first position sensor 190 may be disposed to correspond to the second magnet 185.

For example, the first position sensor 190 may receive data from a Hall sensor and a Hall sensor, and perform data communication, for example, I2C communication using a protocol with an external controller. Alternatively, the first position sensor 190 may be implemented as a Hall sensor alone.

Next, the first magnet 130 will be described.

The first magnet 130 is disposed on the outer circumferential surface of the housing 140 to correspond to the first coil 120. For example, the first magnet 130 may be disposed on the support portions 720-1 to 720-4 of the housing 140. For example, the first magnet 130 may be disposed on the first and second side surfaces 720-1 and 720-2 of the support parts 720-1 to 720-4.

The first magnet 130 may be fixed to the support portions 720-1 to 720-4 of the housing 140 using an adhesive member such as an adhesive or double-sided tape.

The number of first magnets 130 may be one or more. For example, as shown in FIG. 2, the four first magnets 130-1 to 130-4 are spaced apart from each other so that the first and second magnets of the support parts 720-1 to 720-4 of the housing 140 are separated from each other. 2 It may be disposed on the side surfaces 720-1 and 720-2.

For example, each of the first magnets 130-1 to 130-4 may be arranged to be aligned with any one of the first side surfaces 115a of the bobbin 110, but is not limited thereto.

Each of the first magnets 130 may have a rectangular parallelepiped shape, but is not limited thereto, and may be a trapezoidal shape in another embodiment.

Each of the first magnets 130-1 to 130-4 may be disposed such that a wide surface faces the outer peripheral surface of the housing 140, and the first magnets 130-1 and 130-3 and 130 face each other. -2 and 130-4) can be placed in parallel.

In addition, the first magnet 130 may be disposed to face the first coil 120 to be described later.

Each of the first magnets 130-1 to 130-4 and surfaces facing each other of the first coil 120 may be disposed to be parallel to each other. However, this is not limited thereto, and only one of the faces of each of the first magnets 130-1 to 130-4 and the first coil 120 may be a flat surface, and the other may be formed of a curved surface. May be. Alternatively, the first coil 120 and the first magnets 130-1 to 130-4 may all have a curved surface, and in this case, the first coil 120 and the first magnets 130- 1 to 130-4) The curvature of each facing surface may be the same.

When each of the first magnets 130-1 to 130-4 is disposed so that the entire surface facing the first coil 120 has the same polarity, the first coil 120 is also the first magnets 130-1 To 130-4) may be configured such that the surfaces corresponding to each have the same polarity.

For example, each of the first magnets 130-1 to 130-4 may be arranged such that a surface facing the first coil 120 is an N pole, and a surface opposite to the N pole is an S pole. However, this is not limited thereto, and it is also possible to configure the polarities of each of the first magnets 130-1 to 130-4 in reverse.

In another embodiment, when each of the first magnets 130-1 to 130-4 is divided into two surfaces perpendicular to the optical axis, and the surface facing the first coil 120 is divided into two or more One coil 120 may also be dividedly configured to correspond to the divided number of each of the first magnets 130.

Next, the upper elastic member 150 and the lower elastic member 160 will be described.

The upper elastic member 150 and the lower elastic member 160 elastically support the bobbin 110 so as to perform ascending and descending operations in a first direction parallel to the optical axis.

As shown in Figure 9. The upper elastic member 150 includes an inner frame 151 coupled with the bobbin 110, an outer frame 152 coupled with the housing 140, and a connection part 153 connecting the inner frame 151 and the outer frame 152. ), and an elastic support member 220a to 220d connected to the outer frame 152.

The lower elastic member 160 includes an inner frame 161 coupled with the bobbin 110 and an outer frame 162 coupled with the housing 140, and a connection portion connecting the inner frame 161 and the outer frame 162 ( 163) may be included. The upper elastic member 150 and the lower elastic member 160 may have a leaf spring shape.

The connection portions 153 and 163 of each of the upper and lower elastic members 150 and 160 may be bent at least once to form a pattern having a predetermined shape.

The lifting and/or lowering motion of the bobbin 110 in the first direction parallel to the optical axis may be supported by the elastic force through position change and fine deformation of the connection portions 153 and 163. The connecting parts 153 and 163 may connect the inner frames 151 and 161 and the outer frames 152 and 162 so that the inner frames 151 and 161 can be elastically deformed in a predetermined range in the first direction with respect to the outer frames 152 and 162. .

The inner frame 151 of the upper elastic member 150 may include a hollow 101 of the bobbin 110, or/and a hollow corresponding to the hollow 201 of the housing 140. The outer frame 152 of the upper elastic member 150 may have a polygonal ring shape disposed around the inner frame 151.

The inner frame 151 of the upper elastic member 150 may have a bent portion 151a that is coupled to the upper support protrusion 113 of the bobbin 110.

The bent portion 151a may have a convex groove shape from the center of the inner frame 151 toward the outer peripheral surface of the inner frame 151.

The bent portion 151a may include a first portion 911, a second portion 912, and a third portion 913 positioned between the first portion 911 and the second portion 912.

The first and second portions 911 and 912 of the bent portion 151a are fitted between the central protrusion 113a and the first upper protrusion 113b, and between the central protrusion 113a and the second upper protrusion 113c. I can. The inner peripheral surface of the third portion 913 of the bent portion 151a may contact the outer peripheral surface of the central protrusion 113a of the bobbin 110.

The upper support protrusion 113 of the bobbin 110 and the bent portion 151a of the upper elastic member 150 may be fixed by heat fusion or an adhesive member such as epoxy.

The outer frame 152 of the upper elastic member 150 may be provided with a first through hole 152a that couples with the upper frame support protrusion 144 of the housing 140. The upper frame support protrusion 144 of the housing 140 and the first through hole 152a of the upper elastic member 150 may be fixed by thermal fusion or may be fixed with an adhesive member such as epoxy.

The outer frame 152 of the upper elastic member 150 may be provided with a first guide groove 155 coupled with the first stopper 143 of the housing 140.

The guide groove 155 of the upper elastic member 150 may be formed at a position corresponding to the first stopper 143 of the housing 140, for example, adjacent to the edge of the outer frame 152.

For example, first guide grooves 155a and 155b corresponding to each of the divided first stoppers 143a and 143b may be formed in the outer frame 152 of the upper elastic member 150, and the first guide grooves ( 155a, 155b) can be separated from each other.

The inner frame 161 of the lower elastic member 160 may have a hollow 101 of the bobbin 110, or/and a hollow corresponding to the hollow 201 of the housing 140.

The outer frame 162 of the lower elastic member 160 may have a polygonal ring shape disposed around the inner frame 161.

The lower elastic member 160 may be divided into two to receive power having different polarities. The lower elastic member 160 may include a first lower elastic member 150a and a second lower elastic member 150b that are electrically separated from each other.

Each of the inner frame 161 and the outer frame 162 of the lower elastic member 160 may be divided into two so as to be electrically separated.

For example, the first lower elastic member 160a may include any one of the two divided inner frames, any one of the two divided outer frames, and a connection part connecting both. The second lower elastic member 160b may include the other one of the two divided inner frames, the other of the two divided outer frames, and a connection part connecting the two.

The inner frame 161 of the lower elastic member 160 may be provided with a third through hole 161a that couples with the lower support protrusion 114 of the bobbin 110. The lower support protrusion 114 of the bobbin 110 and the third through-hole 161a of the lower elastic member 150 may be fixed by thermal fusion or may be fixed with an adhesive member such as epoxy.

The outer frame 162 of the lower elastic member 160 may be provided with an insertion groove 162a that couples with the lower frame support protrusion 145 of the support portions 720-1 to 720-4 of the housing 140. .

The lower frame support protrusion 145 of the housing 140 and the insertion groove 162a of the lower elastic member 160 may be fixed by thermal fusion or may be fixed with an adhesive member such as epoxy.

The lower elastic member 160 may be electrically connected to the first coil 120.

The line of sight of the first coil 120 may be electrically connected to the first lower elastic member 160a, and the vertical line of the first coil 120 may be electrically connected to the second lower elastic member 160b.

For example, at one end of the inner frame of the first lower elastic member 160a, a first bonding portion to which the eye of the first coil 120 is electrically connected by soldering or soldering may be provided. In addition, at one end of the inner frame of the second lower elastic member 160b, a second bonding portion to which the vertical line of the first coil 120 is electrically connected may be provided.

The lower elastic member 160 is electrically connected to the first circuit board 170 to be described later. For example, the outer frame 162 of each of the first and second lower elastic members 160a and 160b includes pad portions 165a and 165b that are electrically connected to the first circuit board 170 through soldering or soldering. Can be equipped.

The pad portions 165a and 165b of the lower elastic member 160 are the first terminals 175-1 to 175-n, n>1 formed on the first terminal surface 170a of the first circuit board 170. It may be electrically connected to a corresponding terminal among natural numbers).

The coupling between the first through hole 151a of the inner frame 151 of the upper elastic member 150 and the upper support protrusion 113 of the bobbin 110, and the first of the inner frame 161 of the lower elastic member 160 3 By coupling between the through hole 161a and the lower support protrusion 114 of the bobbin 110, the bobbin 110 may be fixed to the inner frames 151 and 161 of the upper and lower elastic members 150 and 160. have.

In addition, the coupling between the second through-hole 152a of the outer frame 152 of the upper elastic member 150 and the upper frame support protrusion 144 of the housing 140, and the outer frame 162 of the lower elastic member 160 By the coupling between the insertion groove 162a of the housing 140 and the lower frame support protrusion 145 of the housing 140, the housing 140 is the outer frames 152, 162 of the upper and lower elastic members 150, 160 Can be fixed to

In another embodiment, the upper elastic member 150 and the lower elastic member 160 may be electrically connected to the first circuit board 170 without dividing the lower elastic member 160 into two.

In the embodiment, the lower elastic member 160 is divided into two, and the upper elastic member 150 is not divided, but is not limited thereto. In another embodiment, the lower elastic member 160 is not divided, but the upper elastic member 150 is divided into two, and the upper elastic members divided into two are electrically connected to the first circuit board 170, so that the first coil ( 120) can be supplied with different polarities.

In another embodiment, the upper and lower elastic members 150 and 160 are not divided, the line of sight of the first coil 120 is connected to the upper elastic member 150, and the vertical line of the first coil 120 is lowered. By connecting the elastic member 160 and electrically connecting the upper and lower elastic members 150 to the first circuit board, power having a different polarity may be supplied to the first coil 120.

In another embodiment, the upper and lower elastic members 150 and 160 are not divided, the first circuit board 170 is not electrically connected, and the first circuit board 170 and the first coil 120 are electrically connected. By direct connection and electrically connecting the first circuit board 170 and the second circuit board 250 by the elastic support members 220a to 220d, power having different polarities can be supplied to the first coil 120. .

Next, the first circuit board 170 will be described.

The first circuit board 170 is disposed on the upper elastic member 150.

15 shows a perspective view of the first circuit board 170 shown in FIG. 2.

Referring to FIG. 15, the first circuit board 170 moves downward from the first upper surface part 170b and the first upper surface part 170b disposed on the outer frame 152 of the upper elastic member 150. It may include a first terminal surface 170a that is bent.

The first upper surface portion 170b of the first circuit board 170 may have a shape corresponding or coincident with the outer frame 152 of the upper elastic member 150. For example, the first upper surface portion 170b of the first circuit board 170 may have a ring shape having a hollow 710-1, and the outer peripheral surface of the upper surface portion 170b of the first circuit board 170 Can be square.

The first circuit board 170 may have a fourth through hole 171 coupled with the upper support protrusion 144 of the housing 140 on the first upper surface 170b. The upper support protrusion 144 of the housing 140 and the fourth through hole 171 of the first circuit board 170 may be fixed by heat fusion or an adhesive member such as epoxy.

The first circuit board 170 may include a second guide groove 172 coupled to the first stopper 143 of the housing 140. Here, the second guide groove 172 may be in the form of a through groove penetrating through the first circuit board 170.

The first stopper 143 of the housing 140 includes a first guide groove 155 of the outer frame 152 of the upper elastic member 150 and a second guide groove 172 of the first circuit board 170. Can be combined together.

The second guide groove 172 of the first circuit board 170 is at a position corresponding to the first stopper 143 of the housing 140, for example, of the first upper surface 170b of the first circuit board 170. It can be formed adjacent to the edge.

For example, second guide grooves 172a and 172b corresponding to the divided first stoppers 143a and 143b may be formed on the first upper surface 170b of the first circuit board 170, and the second guide The grooves 172a and 172b may be spaced apart from each other.

The first circuit board 170 may include first pads 174a to 174d to which one end of the elastic support members 220a to 220d is electrically connected to the first upper surface 170b.

For example, the first pads 174a to 174d of the first circuit board 170 may have through holes through which the elastic support members 220a to 220d are inserted.

Each of the first pads 174a to 174d of the first circuit board 170 by soldering or soldering may be electrically connected to one end corresponding to one of the elastic support members 220a to 220d.

Each of the first pads 174a to 174d of the first circuit board 170 corresponds to a corner of the first upper surface 170b of the first circuit board 170 and the second guide grooves 172a and 172b. Can be placed between one.

The first terminal surface 170a of the first circuit board 170 may be vertically bent downward from the first upper surface portion 170b, and a plurality of first terminals to which an electrical signal is input from the outside or It may include first pins (pins, 175-1 to 175-n, a natural number of n>1).

For example, in order to facilitate electrical connection with the first position sensor 190, the first terminal surface 170a of the first circuit board 170 is the housing 140 in which the first position sensor groove 141b is provided. It may be bent toward the side of the upper end 710 of. Accordingly, the first position sensor 190 disposed in the first position sensor groove 141b may be in close contact with the first terminal surface 170a of the first circuit board 170.

The plurality of terminals (175-1 to 175-n, a natural number of n>1) receives power from the outside and supplies power to the first position sensor 190, and outputs the output of the first position sensor 190. An output terminal or/and a terminal for testing the first position sensor 190 may be included. The number of terminals 175-1 to 175-n formed on the first circuit board 170, a natural number of n>1 may be increased or decreased according to the type of components requiring control.

The first position sensor 190 is a plurality of terminals (175-1 to 175-n, n>1, a natural number formed on the first terminal surface 170a of the first circuit board 170 by soldering or soldering) At least one of the terminals may be electrically connected, and the number of terminals electrically connected may be determined according to an implementation form of the first position sensor 190.

As shown in FIG. 22B, in another embodiment, the first circuit board 170 and the upper elastic member 150 may be integrally implemented. For example, the first circuit board 170 may be omitted, and the upper elastic member 150PA may include a structure in which a thin film having heat resistance, chemical resistance, and bending resistance, and a copper foil pattern for circuit wiring are stacked. .

In addition, in another embodiment, the first circuit board 170 and the lower elastic member 160 may be integrally implemented. For example, the first circuit board 170 may be omitted, and the lower elastic member 160 may include a structure in which a flexible film and a copper foil pattern are stacked.

Next, the base 210, the second circuit board 250, and the second coil 230 will be described.

The base 210 is connected to the cover member 300 described above, and the support portions 720-1 to 720-4 of the housing 140 may be fixed.

14 is an exploded perspective view of the base 210, the second circuit board 250, and the second coil 230 shown in FIG. 2.

Referring to FIG. 14, the base 210 has a hollow 101 of the bobbin 110 described above, or/and a hollow 301 (see FIG. 10) corresponding to the hollow 201 of the housing 140, It may have a shape that matches or corresponds to the cover member 300, for example, a square shape.

In addition, the base 210 is recessed from the upper surface (recessed), the mounting groove 213 for inserting or fixing the lower frame support protrusions 145 of the support portions 720-1 to 72-4 of the housing 140 It can be provided.

For example, the mounting groove 213 may be formed on the upper surface of the base 210 to correspond to the second sidewall 142 of the housing 140.

In order to facilitate the insertion of the lower frame support protrusion 145 of the housing 140, a part of the side surface of the mounting groove 213 may be opened through the hollow 301 of the base 210. That is, among the side surfaces of the mounting groove 213 of the base 210, a surface of the base 210 facing the hollow may be opened.

The lower frame support protrusion 145 of the housing 140 may be inserted into the seating groove 213 and may be fixed to the seating groove 213 by an adhesive member such as epoxy.

The base 210 is formed to be concave from the side to a certain depth inward, and has a size corresponding to the terminal surface 250a of the second circuit board 250 to support the terminal surface 250a of the second circuit board 250 It may be provided with a terminal surface support groove (210a) having.

The terminal surface support groove 210a may be formed on at least one of the side surfaces of the base 210 and does not protrude out of the outer circumferential surface of the base 210 or the second It may serve to seat the terminal surface 250a of the circuit board 250.

In addition, the base 210 is recessed from the upper surface, the second position sensor mounting groove 215a in which the second position sensor 240a is disposed, and the third position sensor mounting groove in which the third position sensor 240b is disposed (215b) may be provided.

An angle formed by the virtual lines connecting the center of the base 210 and the second and third position sensor mounting grooves 215a and 215b may be 90°.

The second and third position sensor seating grooves 215a and 215b may be opened out of the side of the base 210 and may be opened to the hollow 301 of the base 210, but are not limited thereto, and other implementations In an example, the second and third position sensor seating grooves may have a concave shape recessed from an upper surface.

The second and third position sensor mounting grooves 215a and 215b may be located at the center of the side of the upper surface of the base 210. For example, the first and second position sensor mounting grooves 215a and 215b may correspond to or be aligned with the center or the center of the second coil 230, and the center of the second coil 230 and the position sensor mounting groove The centers of the second and third position sensors 240a and 240b disposed on the fields 215a and 215b may be aligned with each other.

The upper surfaces of the second and third position sensors 240a and 240b disposed in the second and third position sensor mounting grooves 215a and 215b and the upper surface of the base 210 may be the same plane.

In addition, the base 210 may further include a stepped step 210b protruding from a lower outer circumferential surface. When the base 210 and the cover member 300 are coupled, the upper portion of the stepped portion 210b of the base 210 may guide the cover member 300 and may contact the lower portion of the cover member 300. Ends of the stepped portion 210b and the cover member 300 may be adhesively fixed and sealed with an adhesive or the like.

The base 210 may include a coupling protrusion 212a protruding from an upper surface to fix the second circuit board 250.

The coupling protrusion 212a may be disposed on an upper surface adjacent to the edge of the base 210. For example, the coupling protrusion 212a may be located between the edge of the base 210 and the seating groove 213. The number of the coupling protrusions 212a may be two or more, and may be arranged to face each other, but is not limited thereto.

The printed circuit board on which the image sensor is mounted may be combined with the lower surface of the base 210 to form a camera module.

Next, the second and third position sensors 240a and 240b will be described.

The second and third position sensors 240a and 240b are disposed under the second circuit board 250. For example, the second and third position sensors 240a and 240b may be disposed in the position sensor mounting grooves 215a and 215b of the base 210, and the housing 140 may be in the second direction or/and the third It detects moving in a direction.

The second and third position sensors 240a and 240b may detect a change in magnetic force emitted from the first magnet 130. For example, the second and third position sensors 240a and 240b may be Hall sensors, but are not limited thereto, and any sensor capable of detecting a change in magnetic force may be used.

The second and third position sensors 240a and 240b may be arranged to be aligned with the center of the second coil 230.

The second and third position sensors 240a and 240b may be electrically connected to the second circuit board 250 by soldering or soldering.

Next, the second circuit board 250 will be described.

Based on the second circuit board 250, a second coil 230 may be installed on an upper surface, and position sensors 240a and 240b may be installed on a lower surface. The first and second position sensors 240a and 240b, the second coil 230, and the first magnet 130 may be disposed on the same axis, but are not limited thereto.

The second circuit board 250 is disposed on the upper surface of the base 210, the hollow 101 of the bobbin 110, the hollow 201 of the housing 140, or/and the hollow of the base 210 ( It has a hollow 401 (see Fig. 14) corresponding to 301). The outer peripheral surface of the second circuit board 250 may have a shape that matches or corresponds to the upper surface of the base 210, for example, a square shape.

The second circuit board 250 is bent from an upper surface and includes a plurality of terminals receiving electrical signals from the outside, or at least one second terminal surface 250a on which pins are formed. I can.

For example, the second circuit board 250 may include second coil terminals, second and third position sensor terminals, and first circuit board terminals on the terminal surface 250a.

The second coil terminals may be terminals to which signals for driving the second coils 230a to 230d are input. For example, in order to independently drive each of the four second coils 230a to 230d, there may be a total of eight terminals for the second coil. Alternatively, in order to independently drive the second direction coils 230a and 230b and the third direction coils 230c and 230d, there may be a total of 4 terminals for the second coil.

The second coil terminals may be electrically connected to pads 253-1 to 253-8 of the second circuit board 250 to be described later through a wiring pattern of the second circuit board 250.

The second position sensor terminal may include two input terminals and two output terminals, and the third position sensor terminal may include two input terminals and two output terminals. However, since the second position sensor and the third position sensor may use two input terminals in common, there may be a total of six terminals for the second and third position sensors.

The terminals for the first circuit board may be terminals allocated to the first circuit board 170.

For example, in the case where the first position sensor 190 includes a Hall sensor and a driver for I2C communication, a first power supply (VCC), a second power supply (GND), a synchronization clock signal (SCL), and data Four terminals for bit information (SDA) may be required.

When the first position sensor 190 is an integrated Hall sensor and a driver, the first position sensor 190 may provide two power sources having different polarities provided to the first coil 120, and at this time, the first position sensor The 190 and the first coil 120 may be electrically connected through a wiring pattern of the first circuit board 170. Therefore, when the first position sensor 190 is an integrated Hall sensor and a driver, there may be a total of 4 terminals for the first circuit board.

In addition, for example, when the first position sensor 190 is implemented as a Hall sensor alone, four power terminals for the Hall sensor may be required. Therefore, when the first position sensor 190 is implemented as a Hall sensor alone, there may be a total of four terminals for the first circuit board.

The upper and lower elastic members 150 and 160 are not divided, and the first coil 120 is powered by the first circuit board 120, the second circuit board 250, and the elastic support members 220a to 220d. And, when the first position sensor 190 is implemented as a Hall sensor alone, there may be a total of six terminals for the first circuit board.

In order to reduce the number of terminals formed on the terminal surface 250a, two or more of the ground terminals may be electrically connected in common. For example, among the second and third position sensor terminals, the ground terminals may be electrically connected to each other in common. The ground terminal may be connected to the cover member, and the cover member may be electrically connected to the circuit board of the camera module.

Terminals for the first circuit board of the second circuit board 250 may be electrically connected to the first circuit board 170 by elastic support members 220a to 220d to be described later.

The second circuit board 250 may be a flexible printed circuit board (FPCB), but is not limited thereto, and a terminal of the circuit board may be formed on the surface of the base 210 by using a surface electrode method.

The second circuit board 250 may include at least one terminal or pad 253-1 to 253-8 to which a line of sight or a vertical line of the second coil 230 is electrically connected.

For example, the second circuit board 250 includes first terminals 253-1 and 253-3 to which the eyes of the second coils 230a and 230b for the second direction are electrically connected, and the second coil for the second direction ( The second terminals 253-2 and 253-4 to which the vertical lines of 230a and 230b are electrically connected, and the third terminal 253-5 to which the line of sight of the second coils 230c and 230d for the third direction is electrically connected , 253-7), and fourth terminals 253-6 and 253-8 to which vertical lines of the second coils 230c and 230d for the third direction are electrically connected.

The second circuit board 250 may include a fifth through hole 251 that couples with the coupling protrusion 212a of the base 210. The fifth through hole 251 of the circuit board 250 may be plural, and may be disposed to face each other.

For example, the fifth through hole 251 is between the first terminal 253-3 and the third terminal 253-7 of the second circuit board 250, and the second terminal 253-2 and the fourth terminal ( 253-6) can be placed between.

The second circuit board 250 may include second pads 252a to 252d to which the other ends of the elastic support members 220a to 220d are connected. For example, the second pads 252a to 252d may have grooves or through holes into which the other end of the elastic support members 220a to 220d can be inserted.

Each of the second pads 252a to 252d may be disposed adjacent to the edge of the second circuit board 250, but is not limited thereto.

The second pads 252a to 252d may be electrically connected to a plurality of pins provided on the terminal surfaces 251a and 251b by a wiring pattern formed on the second circuit board 250.

Next, the second coil 230 will be described.

The second coils 230a to 230d are disposed on the upper surface of the second circuit board 250 to correspond or face the first magnet 130.

The number of the second coils 230a to 230d may be one or more, and may be the same as the number of the first magnets 130, but is not limited thereto.

In FIG. 14, the second coils 230a to 230d are disposed to be spaced apart from each other on the upper surface of the second circuit board 250, but are not limited thereto, and in other embodiments, the second circuit board 250 A coil may be included in a separate circuit board, may be disposed in close contact with the base 210, or may be disposed spaced apart from the base 210 by a predetermined distance.

The second coils 230a to 230d may be aligned on the same axis as the first magnet 130, but are not limited thereto. In another embodiment, the second coils 230a to 230d have a separation distance greater than the separation distance between the first magnet 130 and the virtual central axis passing through the hollow 101 of the bobbin and the hollow 301 of the housing 140. It may be arranged to have or may be arranged to have the same separation distance.

A total of four second coils 230a to 230d may be spaced apart from each other on the upper surface of the second circuit board 250. For example, the second coils 230a to 230d may include second coils 230a and 230b for a second direction aligned parallel to the second direction, and second coils for a third direction aligned parallel to the third direction (230c, 230d) may be included.

Another embodiment may include a second coil including one second coil for the second direction and one second coil for the third direction, and another embodiment is a second coil for three or more second directions. It may include coils, and three or more second coils for the third direction.

In addition, the second coils 230a to 230d may be in the form of a donut-shaped wire wound, and may be electrically connected to the second circuit board 250.

For example, the second coils 230a to 230d may be electrically connected to the terminals 253-1 to 253-8 of the second circuit board 250.

Next, the elastic support members 220a to 220d will be described.

The elastic support members 220a to 220d electrically connect the first circuit board 170 and the second circuit board 250.

One end of the elastic support members 220a to 220d may be electrically connected to the first circuit board 170, and the other end of the elastic support members 220a to 220d may be electrically connected to the second circuit board 250.

For example, one end of the elastic support members 220a to 220d may be bonded to the first pads 174a to 174d of the first circuit board 170 to be electrically connected.

The other ends of the elastic support members 220a to 220d may be bonded to the second pads 252a to 252d of the second circuit board 250 to be electrically connected.

The first upper surface portion of the first circuit board 120 includes at least one first corner region, and the second upper surface portion of the second circuit board 250 includes at least one second corner region corresponding to the first corner region. Can include. At least one of the elastic support members 220a to 220d may be disposed between the first corner region and the second corner region.

The first corner region may be an area within a predetermined distance from the corner of the first upper surface of the first circuit board 120, and the second corner region is a predetermined distance from the second upper surface of the second circuit board 250. It may be an area within a distance.

For example, the first pads 174a to 174d may be provided in a first edge area of the first circuit board 170, and the second pads 252a to 252d may be formed of the second circuit board 250. It may be provided in the corner area.

For example, one end of the elastic support members 220a to 220d may be electrically connected to the first pads 174a to 174d of the first circuit board 170, and the other end of the second circuit board 250 2 The pads 252a to 252d may be electrically connected, and the second pads 252a to 252d may be electrically connected to the terminals for the first circuit board by a wiring pattern of the second circuit board 250 .

The lens driving apparatus of FIG. 2 may include elastic support members 220a to 220d facing each other. In FIG. 13, the number of elastic support members connecting the first edge region of each first circuit board 170 and the second edge region of the second circuit board 250 may be one.

The elastic support members 220a to 220d may be point symmetric in second and third directions perpendicular to the first direction based on the center of the housing 140.

The number of elastic support members 220a to 220d may be greater than or equal to the number of terminals for the first circuit board.

For example, when the first position sensor 190 is an integrated hall sensor and a driver, the number of elastic support members 220a to 220d may be 4 or more. In addition, when the first position sensor 190 is implemented as a Hall sensor alone, the number of elastic support members 220a to 220d may be six or more.

The second pads 252a to 252d of the second circuit board 250 may be electrically connected to terminals for a first circuit board formed on the second terminal surface 250a of the second circuit board 250.

The elastic support members 220a to 220d may serve as a path through which an electrical signal between the second circuit board 250 and the first circuit board 170 moves, and the housing 140 is elastic with respect to the base 210. Can be supported by

The elastic support members 220a to 220d may be formed as a separate member from the upper elastic member 150, and may be supported by elasticity, such as a leaf spring, a coil spring, It can be implemented with a suspension wire or the like. In addition, in another embodiment, the elastic support members 220a to 220d may be integrally formed with the upper elastic member.

18 is a plan view of a lens driving apparatus according to another exemplary embodiment, and FIG. 19 is a perspective view of the lens driving apparatus shown in FIG. 18. 18 and 19 are views in which the cover member 300 is omitted.

18 and 19, the lens driving apparatus 10 shown in FIG. 2 includes four elastic support members, but the elastic support members 220-1 to 220-6 shown in FIG. There can be six.

The elastic support members 220-1 to 220-6 may be point symmetric in second and third directions perpendicular to the first direction based on the center of the housing 140.

For example, the elastic support members 220-1 to 220-6 are first elastic support members 220-1 and 220 that are point symmetric in a second direction perpendicular to the first direction with respect to the center of the housing 140. -4), and second elastic support members 220-2, 220-3, 220-5, which are point symmetrical in a first direction and a third direction perpendicular to the second direction based on the center of the housing 140, 220-6).

The number of the first elastic support members 220-1 and 220-4 and the second elastic support members 220-2, 220-3, 220-5, and 220-6 may be different from each other. For example, the number of the second elastic support members 220-2, 220-3, 220-5, and 220-6 may be greater than the number of the first elastic support members 220-1 and 220-4.

First elastic support members for the bobbin 110 to symmetrically or equalize the elastic force in the second and third directions of the elastic support members 220-1 to 220-6 with respect to the bobbin 110 The sum of the elastic forces of (220-1, 220-4) and the sum of the elastic forces of the second elastic support members 220-2, 220-3, 220-5, 220-6 with respect to the bobbin 110 may be the same. I can.

For example, since the number of the second elastic support members 220-2, 220-3, 220-5, 220-6 is greater than the number of the first elastic support members 220-1, 220-4, the second The elastic modulus of the elastic support members 220-2, 220-3, 220-5, and 220-6 may be 1/2 of the elastic modulus of the first elastic support members 220-1 and 220-4. .

20 is a plan view of a lens driving apparatus according to another embodiment, and FIG. 21 is a perspective view of the lens driving apparatus shown in FIG. 20. In FIGS. 20 and 21, the cover member 300 is omitted.

Referring to FIGS. 20 and 21, the number of elastic support members 220-1 ′ to 220-8 ′ may be a total of eight. The elastic support members 220-1 ′ to 220-8 ′ are first elastic support members 220-1 and 220 point symmetric in a second direction perpendicular to the first direction with respect to the center of the housing 140. -2, 220-5', 220-6'), and second elastic support members 220- which are point symmetrical in a first direction and a third direction perpendicular to the second direction based on the center of the housing 140 3', 220-4', 220-7', 220-8').

The number of the first elastic support members 220-1', 220-4' and the second elastic support members 220-2', 220-3', 220-5', 220-6' is the same, and , At least one of the first and second elastic support members 220-1 ′ to 220-8 ′ may electrically connect the first circuit board 120 and the second circuit board 250. In addition, the elastic modulus of the first and second elastic support members 220-1 ′ to 220-8 ′ may be the same.

22A is a perspective view of a lens driving apparatus according to another embodiment. In FIG. 22A, the cover member 300 is omitted.

Compared with the embodiment shown in FIG. 3, the embodiment shown in FIG. 22 may further include a first damper DA1, a second damper DA2, and a third damper DA3. In addition, in another embodiment, any one of the first damper DA1, the second damper DA2, and the third damper DA3 may be included, or a combination of two or more may be included.

The first damper DA1 may be provided on a portion where one end of the elastic support members 220a to 220d and the first circuit board 170 are electrically connected. For example, the first damper DA1 may be applied on a portion to which one end of the elastic support members 220a to 220d and the first pads 174a to 174d (see FIG. 15) of the first circuit board 170 are bonded. .

The second damper DA2 may be provided on a portion where the other ends of the elastic support members 220a to 220d and the second circuit board 250 are electrically bonded. For example, the second damper DA2 may be applied on a portion to which the other ends of the elastic support members 220a to 220d and the second pads 252a to 252d (see FIG. 14) of the second circuit board 250 are bonded. .

The third damper DA3 may be provided between the through groove 751 of the housing 140 and the elastic support members 220a to 220d inserted into the through groove 751.

The dampers DA1 to DA3 may prevent oscillation when the bobbin 110 moves.

22B is a perspective view of a lens driving device according to another embodiment, and FIG. 22B is a view in which the cover member 300 is omitted. The same reference numerals as in FIG. 3 denote the same configuration, and description of the same configuration is omitted or simplified.

The upper elastic member 150P shown in FIG. 22B may be implemented by integrating the upper elastic member 150 shown in FIG. 1 and the first circuit board 170.

The upper elastic member 150P shown in FIG. 22B may include an inner frame 151, an outer frame 152, and a connection part 153 serving as an elastic support. The shape of the upper elastic member 150P may be similar to that described in FIG. 10.

The upper elastic member 150P shown in FIG. 22B may include a circuit pattern electrically connected to one end of the elastic support members 220a to 220d. For example, wires electrically connected to one end of each of the elastic support members 220a to 220d may be formed on the outer frame 152 of the upper elastic member 150P.

In addition, the upper elastic member 150P may include a terminal surface 150PA that is bent downward from one end of the outer frame 152. The terminal surface 150PA of the upper elastic member 150P may include a plurality of terminals or pins to which an electrical signal is input from the outside. The terminal surface of the upper elastic member 150P may play the same role as the terminal surface 170a of the first circuit board 170 described above.

23 is a conceptual diagram illustrating auto focusing and camera shake correction of the lens driving apparatus 10 according to an embodiment. Coil 1 may be the second coil 230a, coil 3 may be the second coil 230b, coil 2 may be the second coil 230c, and coil 4 may be the second coil 230d. have.

Referring to FIG. 23, the movable part 60 may be located above the second circuit board 250 and the base 210 at an initial position.

Here, the initial position may be a position at which the movable part 60 is placed as the upper and lower elastic members 150 and 160 are elastically deformed only by the weight of the movable part 60.

For example, it may be desirable to set the initial position to a moving distance that can compensate for about 0.5° to 1.5°, and converting this to the focal length of the lens, the movable part ( 50).

Here, in the case of auto focusing, the movable part 60 may include a first magnet 130, a bobbin 110, and a lens (not shown) mounted on the bobbin 110, and the fixing part is a housing 140, a cover The member 300, the base 210, the second coils 230a to 230d, and the second circuit board 250 may be included.

In addition, in the case of OIS for camera shake correction, the movable part 60 includes the first magnet 130, the bobbin 110, the upper and lower elastic members 150 and 160, the first circuit board 170, and the first position sensor ( 190) may be included. On the other hand, the fixing part may include the housing 140, the cover member 300, the base 210, and the second coils 230a to 230d.

Due to the electromagnetic force between the first magnet 130 and the first coil 120, the movable part 60 is in a first direction based on the initial position, for example, an upper direction (+Z axis direction) and a lower direction (-Z axis direction). Autofocusing can be performed by moving to. For example, by controlling the direction of the current flowing through the first coil 120, autofocusing may be performed. Accordingly, the embodiment may be miniaturized, and the movable part 60 may be moved to a desired location with less electromagnetic force.

For example, the bobbin 110 and the base 210 may be spaced apart from each other in order to perform auto-focusing in the upper and lower directions based on the initial position.

OIS operation is based on the value measured by the gyro sensor, the movable part 60 by the electromagnetic force generated between the first magnet 130 and the second coil (230a to 230d) -X axis direction, +X axis direction, It is to move in the -Y-axis direction or the +Y-axis direction.

Each of the four second coils 230a to 230d may be independently driven. For example, by independently controlling the direction of current flowing through each of the four second coils 230a to 230d, the movable part 60 can be moved in the X and Y axes. Accordingly, in the embodiment, image correction may be performed in a free direction.

24 shows the moving direction of the movable part 60 according to the control of the second coils 230a to 230d according to the first embodiment.

Referring to FIG. 24, in the table, 0 means not driven, 1 may mean driven, and may mean a difference in voltage input to the second coils 230a to 230d. For example, 0 may mean that no current is applied, and 1 may mean that a current is applied to the second coil so that the electromagnetic force acts in the direction of the second coil in the movable part 60.

Referring to FIG. 24, as the four second coils 230a to 230d are independently driven, the movable part 60 is in the +X direction, -X direction, +Y direction, -Y direction, X+Y+ direction, It may move in any one of the X-Y+ direction, X+Y- direction, and XY- direction, or may not move in the X-axis and Y-axis directions.

In addition, as the first coil 120 and the second coils 230a to 230d are simultaneously driven, autofocusing and OIS operations may be simultaneously performed. For example, by adjusting the level of signals provided to the first coil 120 and the second coils 230a to 230d, autofocusing and OIS operations may be performed simultaneously.

25 is a diagram illustrating a moving direction of the movable part 60 according to the control of the second coils 230a to 230d according to the second embodiment.

Referring to FIG. 25, two second coils 230a and 230b, 230c and 230d facing each other are electrically connected, and two pairs of second coils 230a and 230b, 230c and 230d electrically connected to each other. Can be driven independently. 0 is a case of not driving, and + and-may mean that the directions of driving currents are opposite to each other.

As compared with FIG. 24, since the two second coils are connected in FIG. 25, a greater force may be applied to the movable part 60. In addition, as the first coil 120 and the second coils 230a to 230d are simultaneously driven, autofocusing and OIS operations may be simultaneously performed. For example, by adjusting the level of signals provided to the first coil 120 and the second coils 230a to 230d, autofocusing and OIS operations may be performed simultaneously.

26 shows the position of the movable part 60 according to the intensity of the current applied to the first coil 120.

Referring to FIG. 26, by controlling the intensity and direction of the current applied to the first coil 120, the movable part 60 can be moved in an upward direction and a downward direction based on an initial position (0).

For example, a moving distance (eg, 200 μm) in the upward direction of the movable unit 60 based on the initial position 0 may be greater than a movement distance (eg, 100 μm) of the movable unit 60 in the downward direction. This is to minimize the consumption values of current and voltage in an area of 50 cm or more, which is the area most frequently used by users. Here, the moving distance in the upper direction may be a distance from the initial position (0) to the upper stopper of the movable part 60, and the moving distance in the lower direction may be a distance from the initial position (0) to the lower stopper of the movable part 60. .

The camera module may include a lens driving device configured as described above, a lens barrel coupled to the bobbin 110, an image sensor, and a printed circuit board. In this case, an image sensor may be mounted on the printed circuit board, and the printed circuit board may form a bottom surface of the camera module.

The bobbin 110 may include a lens barrel in which at least one lens is installed, and the lens barrel may be formed to be screw-coupled into the bobbin 110. However, this is not limited thereto, and although not shown, the lens barrel may be directly fixed to the inside of the bobbin 110 by a method other than screwing, or one or more lenses may be integrally formed with the bobbin without the lens barrel. The lens may be composed of one sheet, or two or more lenses may be configured to form an optical system.

An infrared cut filter may be additionally installed in a region of the base corresponding to the image sensor, and may be combined with the cover member 300. In addition, the lower side of the cover member 300 may be supported. A separate terminal member may be installed on the base 210 to energize the printed circuit board of the camera module, or a terminal may be integrally formed using a surface electrode or the like. Meanwhile, the base 210 may function as a sensor holder to protect the image sensor, and in this case, a protrusion may be formed in a downward direction along the side of the base 210. However, this is not an essential configuration, and although not shown, a separate sensor holder may be disposed under the base 210 to perform its role.

In addition, the camera module may further include a focus controller capable of controlling the focus of the lens. For convenience, the focus control unit will be described with reference to the lens driving apparatus described above, but the embodiment is not limited thereto.

That is, it goes without saying that the focus control unit according to the embodiment may be applied to a lens driving apparatus having a configuration different from that of the aforementioned lens driving apparatus to perform an auto focus function. That is, the focus control unit can be applied to a lens driving device having any configuration as long as it can move the bobbin in the optical axis direction by the interaction of the coil and the magnet.

FIG. 27A is a block diagram showing a configuration of a focus control unit 400 according to an embodiment, and FIG. 27B is a flowchart according to an embodiment of an auto focus control method performed by the focus control unit 400 shown in FIG. 27A.

Referring to FIGS. 27A and 27B, the focus controller 400 controls the interaction between the first coil 120 and the magnet 130 according to subject information, so that a first movement amount in a first direction parallel to the optical axis (or , By moving the bobbin 110 by the amount of the first displacement) to perform the auto focus function. To this end, the focus control unit 400 may include an information acquisition unit 410, a bobbin position search unit 420, and a movement amount adjustment unit 430.

The information acquisition unit 410 may acquire subject information (S210).

Here, the subject information may include at least one of a distance between a subject and at least one lens (not shown), a distance between the subject and an image sensor, a location of the subject, or a phase of the subject.

Subject information can be obtained in various ways.

According to an embodiment, subject information may be obtained using two cameras. According to another embodiment, subject information may be obtained using a laser. For example, in Korean Publication No. 1989-0008573, a method of measuring a distance of an object using a laser is disclosed.

According to another embodiment, subject information may be obtained using a sensor.

For example, a US Patent Publication (Publication No. US 2013/0033572) discloses a method of obtaining a distance between a camera and a subject using an image sensor.

The bobbin position search unit 420 may find a location of the bobbin 110 that is in focus corresponding to the subject information acquired by the information acquisition unit 410 (S220).

For example, the bobbin position search unit 420 may include a data extracting unit 422 and a look up table (LUT) 424.

The look-up table 424 may map and store the location of the bobbin 110 in focus for each subject information.

For example, the position of the bobbin 110 to have an optimal focus for each distance between a subject and a lens may be obtained in advance and stored in the form of a look-up table 424.

That is, the look-up table 424 may be generated using the first position sensor 190 before moving the bobbin 110 by the first movement amount in step S230.

For example, a displacement value calculated based on a current change value or a code value sensed by the first position sensor 190 corresponds to the position of the bobbin 110. Accordingly, the lookup table 424 may be generated by measuring the position of the bobbin 110 when focus is achieved for each subject information, which is a distance between the subject and the lens. In this case, the measured position of the bobbin 110 may be coded and stored in the lookup table 424.

The data extraction unit 422 receives the subject information obtained from the information acquisition unit 410, extracts the location of the bobbin 110 that is in focus corresponding to the subject information from the look-up table 424, and extracts the extracted bobbin ( The position of 110) may be output to the movement amount adjusting unit 430.

As described above, when the position of the bobbin 110 is coded and stored in the look-up table 424, the data extracting unit 422 may find the code value corresponding to the subject information in the look-up table 424. .

After step S220, the movement amount adjusting unit 430 may move the bobbin 110 to the position found by the bobbin position search unit 420 by a first movement amount (or a first displacement amount) (S230).

For example, the movement amount adjusting unit 330 may move the bobbin 110 by a first movement amount in the first direction by adjusting an amount of current or a code value applied to the first coil 120. To this end, the amount of current for each position of the bobbin 110 may be determined in advance.

For example, as the bobbin 110 moves in the first direction, the first position sensor 190 may detect a change in magnetic force emitted from the second magnet 185 coupled to the bobbin 110, The amount of change in the output current may be detected based on the amount of change in the detected magnetic force.

Further, the movement amount adjusting unit 430 may calculate or determine the current position of the bobbin 110 based on the amount of current change detected by the first position sensor 190, and the current position of the bobbin 110 calculated or determined in this way An amount of applied current for moving the bobbin 110 to a position in focus by the first movement amount may be determined with reference to the position.

28A and 28B are graphs for explaining the autofocus function according to the comparative example. In FIG. 28A, the horizontal axis represents a focus value and the vertical axis represents displacement, and in FIG. 28B, the horizontal axis represents current (or time), and the vertical axis Represents the displacement (or code).

29A and 29B are graphs for explaining an autofocus function according to an embodiment. In FIG. 29A, the horizontal axis represents a focus value and the vertical axis represents displacement, and in FIG. 29B, the horizontal axis represents current (or time), and the vertical axis Represents the displacement (or code).

Referring to FIGS. 28A and 28B, the bobbin 110 having the best focus while increasing the current applied to the first coil 120 from the first reference focal length (Infinity) to the second reference focal length (Macro). Find the location (or displacement) 400.

The first reference focal length may be a focal length when the lens and the image sensor are at the farthest position, and the second reference focal length may be a focal length at the closest position between the lens and the image sensor, but is not limited thereto. In another embodiment, the first reference focal length may be a focal length at a position closest to the lens and the image sensor, and the second reference focal length may be a focal length at a position farthest between the lens and the image sensor.

As current is applied to the first coil 120, the bobbin 110 may not be driven for an initial predetermined time (P). Thereafter, as the current 402 (or the code value 404 corresponding to the amount of change in the magnetic force sensed by the first position sensor 190) continues to increase, the displacement of the bobbin 110 may increase.

In the case of the comparative example shown in FIGS. 28A and 28B, after moving the bobbin 110 from the first reference focal length to the second reference focal length, the position 400 of the bobbin 110 with the best focus is found. , It can be time consuming.

On the other hand, in the case of the embodiment shown in FIGS. 29A and 29B, the code for the position of the bobbin 110 in which the lens is in focus is found in the look-up table 424 using subject information, and based on this, the bobbin 110 Can be immediately moved to the focus position (or displacement) 410 by the first movement amount. Accordingly, it can be seen that the time required to focus the lens is shortened as compared with the comparative example described above.

Meanwhile, after the lens is focused through the above-described steps S210 to S230, the lens may be finely focused (steps S240 to S260).

30A and 30B are graphs for explaining fine adjustment in the auto focus function according to an embodiment. In FIG. 30A, the horizontal axis represents the focus value, the vertical axis represents the displacement, and the horizontal axis in FIG. 30B represents the current (or time). And the vertical axis represents the displacement (or code).

30A and 30B, the focus control unit 400 performs step S230 in which the bobbin 110 is moved by the first movement amount, and then moves the bobbin 110 within a range of the second movement amount smaller than the first movement amount. The focal position of the bobbin 110 showing the largest value among the values of the frequency modulation transfer function (MTF) may be found by moving (S240). Here, the MTF value may be a value obtained by quantifying resolution.

After step S240, the focus control unit 400 determines whether the bobbin 110 has been moved for a predetermined period to find the largest MTF value (S250). Alternatively, in order to find the largest MTF value, the initial control unit 400 may determine whether the bobbin 110 has been moved a predetermined number of times (S250). Alternatively, the bobbin 110 may be continuously moved over a predetermined period or over a predetermined number of times until the largest MTF value is found.

If it is determined that the bobbin 110 has been moved for a predetermined period or a predetermined number of times, the position of the bobbin 110 showing the largest MTF value may be determined as a final focal position at which the lens is finally focused (S260).

By performing steps S240 to S260, the camera module according to the embodiment may improve the resolution by accurately focusing the lens.

FIG. 31 is a flowchart according to another embodiment of an automatic focus control method performed by the focus controller 400 shown in FIG. 27.

Referring to FIG. 31, steps S210 to S230 described in FIG. 28 are performed.

Next, the focus control unit 400 determines whether the direction in which the bobbin 110 is moved by the first movement amount is an upward direction or a downward direction based on the initial position of the bobbin 110 (S310). Here, the initial position of the bobbin 110 may be a position of the bobbin 110 just before the bobbin 110 moves by the first movement amount.

When moving in the upward direction based on the initial position of the bobbin 110, the bobbin 110 is moved by the second movement amount in the downward direction (S320). Here, since the second movement amount is smaller than the first movement amount, the focus control unit 400 may finely adjust the position of the bobbin and the focus of the lens may be finely adjusted. Here, the fine adjustment method in the downward direction may be the same as steps S240 to S260 described in FIG. 28.

When the bobbin 110 moves downward based on the initial position, the bobbin 110 is moved upward by the second movement amount (S330). Here, the fine adjustment method in the upward direction may be the same as steps S240 to S260 described in FIG. 28.

32 is a schematic cross-sectional view of a lens driving apparatus 1200A according to another embodiment.

The lens driving device 1200A shown in FIG. 32 includes a fixed part 1210, a moving part 1220, lower and upper springs 1230 and 1240, a positive magnetized magnet (or a two-pole magnetized magnet) 1250 and a position. A sensor 1260 may be included. For example, the position sensor 1260 may be a position detection sensor or a driver including a position detection sensor.

The fixing part 1210 may include a lower part 1212, a side part 1214, and an upper part 1216.

When the moving part 1220 of the lens driving device 1200A moves in one direction of the optical axis, the lower part 1212 of the fixing part 1210 may support the moving part 1220 in an initial stationary state, or The moving part 220 may be supported in an initial stationary state in a state spaced apart from the lower part 1210 of the fixed part 210 by a predetermined distance by the upper and/or lower springs 1230 and 1240.

In addition, the side portion 214 of the fixing portion 1210 may serve to support the lower spring 1230 and the upper spring 1240, but the lower portion 1212 and/or the upper portion 1216 of the fixing portion 1210 The lower and/or upper springs 1230 and 1240 may be supported.

For example, the fixing part 1210 may correspond to the housing 140 in the lens driving apparatus 100 described above, may correspond to the cover member 300, or may correspond to the base 210.

At least one lens (not shown) may be mounted on the moving part 1220. For example, the moving unit 1220 may correspond to the bobbin 110 in the lens driving apparatus 100 of FIG. 1 described above, but the embodiment is not limited thereto.

Although not shown, the lens driving apparatus 1200A may further include a first coil and a magnet. The first coil and the magnet included in the lens driving device 1200A may be disposed to face each other so as to move the moving part 1220 in the z-axis direction, which is the optical axis direction of the lens, so as to interact with each other.

For example, the first coil and the magnet may correspond to the first coil 120 and the first magnet 130 of the lens driving apparatus 100 described above, but the embodiment is not limited thereto.

The moving unit 1220 is shown to be movable in one direction of the optical axis (ie, the +z-axis direction), but as will be described later, the moving unit 1220 according to another embodiment may be used in both directions of the optical axis (ie, + It can move both in the z-axis direction or the -z-axis direction).

Meanwhile, the first position sensor 1260 may detect a first displacement value in the z-axis direction, which is the optical axis direction of the moving unit 1220. The first position sensor 1260 may sense a magnetic field of the anode magnetized magnet 1250 and may output a voltage having a level proportional to the strength of the sensed magnetic field.

In order for the first position sensor 1260 to detect a magnetic field of a linearly varying intensity, the anode magnetization magnet 1250 is in the y-axis direction, which is the magnetization direction in which opposite polarities are disposed with respect to a plane perpendicular to the optical axis direction. It may be disposed to face the first position sensor 1260.

For example, the first position sensor 1260 may correspond to the first position sensor 190 of the lens driving device 100 described above, and the anode magnetized magnet 1250 may be applied to the lens driving device 100 described above. It may correspond to the first magnet 130, but the embodiment is not limited thereto.

The types of the anode magnetized magnet 1250 can be broadly divided into ferrite, alnico, and rare earth magnets, and can be classified into Ptype and F-type according to the shape of the magnetic circuit. I can. The embodiment is not limited to the type of the anode magnetized magnet 1250.

The anode magnetized magnet 1250 may include a side surface facing the first position sensor 1260. Here, the side surface may include a first side 1252 and a second side 1254. The first side 1252 may be a surface having a first polarity, and the second side 1254 may be a surface having a second polarity opposite to the first polarity. The second side surface 1254 may be spaced apart from or in contact with the first side surface 1252 in a z-axis direction parallel to the optical axis direction. At this time, the first length L1 of the first side 1252 in the optical axis direction is equal to or greater than the second length L2 of the second side 1254 in the optical axis direction, or the second length of the second side 1254 in the optical axis direction May be greater than (L2).

In addition, in the anode magnetized magnet 1250, the first magnetic flux density of the first side 1252 having the first polarity may be greater than the second magnetic flux density of the second side 1254 having the second polarity.

The first polarity may be S-pole and the second polarity may be N-pole. Conversely, the first polarity may be N-pole and the second polarity may be S-pole.

33A and 33B are cross-sectional views according to embodiments 1250A and 1250B of the anode magnetized magnet 1250 shown in FIG. 32.

Referring to FIG. 33A, the anode magnetization magnet 1250A may include first and second sensing magnets 1250A-1 and 1250A-2, and may further include a non-magnetic barrier wall 1250A-3. have.

Referring to FIG. 33B, the anode magnetization magnet 1250B may include first and second sensing magnets 1250B-1 and 1250B-2, and may further include a nonmagnetic barrier wall 1250B-3. .

The first and second sensing magnets 1250A-1 and 1250A-2 shown in FIG. 33A may be disposed to be spaced apart or in contact with each other in a direction parallel to the optical axis direction (ie, the z axis direction).

On the other hand, the first and second sensing magnets 1250B-1 and 1250B-2 shown in FIG. 33B may be disposed to be spaced apart or in contact with each other in the magnetization direction (ie, the y-axis direction).

The anode magnetized magnet 1250 shown in FIG. 32 is shown to be a magnet having the structure shown in FIG. 33A, but may be replaced with a magnet having the structure shown in FIG. 33B.

In addition, the nonmagnetic barrier wall 1250A-3 shown in FIG. 33A may be disposed between the first and second sensing magnets 1250A-1 and 1250A-2, and the nonmagnetic barrier wall 1250B shown in FIG. 33B -3) may be disposed between the first and second sensing magnets 1250B-1 and 1250B-2.

The non-magnetic barrier ribs 1250A-3 and 1250B-3 may include a section having almost no polarity as a portion having substantially no magnetism, and may also be filled with air or a non-magnetic material.

In addition, the third length L3 of the nonmagnetic barrier ribs 1250A-3 and 1250B-3 is 5% or more of the total length LT in a direction parallel to the optical axis direction of the anode magnetized magnets 1250A, 1250B, or It may be less than 50%.

FIG. 34 is a graph for explaining the operation of the lens driving apparatus 1200A shown in FIG. 32, wherein the horizontal axis represents the distance traveled by the moving unit 1220 in the optical axis direction or the z-axis direction parallel to the optical axis direction. The vertical axis may represent a magnetic field sensed by the first position sensor 1260 or an output voltage output from the first position sensor 1260. The first position sensor 1260 may output a voltage having a level proportional to the strength of the magnetic field.

As shown in FIG. 32, in an initial state before moving the lens in the optical axis direction, that is, in an initial state in which the moving part 1220 on which the lens is mounted is fixed without moving, the first position sensor 1260 is The height of the center (z=zh) is the same as the height of the virtual horizontal plane HS1 extending from the upper end 1251 of the first side 1252 in the y-axis direction, which is the magnetization direction, or the virtual horizontal plane HS1 Can be higher than ).

In this case, referring to FIG. 34, the strength of the magnetic field that can be detected by the first position sensor 1260 may be close to “0”, but may be a value (BO) other than “0”. In this initial state, the moving part 1220, which is mounted with a lens and is movable only in a unidirectional +z-axis direction, is located at the lowest position.

FIG. 35 shows a state in which the lens driving apparatus 1200A shown in FIG. 32 moves in the optical axis direction, and FIG. 36 is a moving part according to a current supplied to the first coil from the lens driving apparatus 1200A according to the embodiment. 1220), in which the horizontal axis represents the current supplied to the first coil and the vertical axis represents the displacement.

Referring to the above drawing, as the intensity of the current supplied to the first coil is increased, the moving part 1220 moves up and down by a first distance (z=z1) in the +z-axis direction as shown in FIG. can do. In this case, referring to FIG. 34, the strength of the magnetic field that can be detected by the first position sensor 1260 may be B1.

Thereafter, when the intensity of the current provided to the first coil is reduced or the current supply to the first coil is cut off, the moving part 1220 may descend to the initial position as shown in FIG. 32.

In order for the moving part 1220 to move up and down from the position shown in FIG. 32 to the position shown in FIG. 35, the electric force of the moving part 1220 is applied to the spring force of the lower and upper springs 1230 and 1240. force).

In addition, in order to restore the moving part 1220 to the original initial position shown in FIG. 32 from the highest elevation point as shown in FIG. 35, the electric force is greater than the spring force of the lower and upper springs 1230 and 1240. Should be less than or equal to That is, after the moving part 1220 moves up and down in the +z-axis direction, it may return to its original position by the restoring force of the lower and upper springs 1230 and 1240.

Here, the lower spring 1230 may include first and second lower springs 1232 and 1234, and the upper spring 1240 may include first and second upper springs 1242 and 1244. Here, the lower spring 1230 is shown to be divided into two first and second lower springs 1232 and 1234, but the embodiment is not limited thereto. That is, the first and second lower springs 1232 and 1234 may be integrally formed.

Likewise, the upper spring 1240 is shown to be divided into two first and second upper springs 1242 and 1244, but the embodiment is not limited thereto, and as shown in FIG. 2, the upper spring 1240 ) Can be formed integrally without being divided.

For example, the lower spring 1230 and the upper spring 1240 may correspond to the lower and upper elastic members 160 and 150 of the lens driving device 100 described above, but the embodiment is not limited thereto.

As illustrated in FIGS. 32 and 35, when the height of the center of the first position sensor 1260 (z=zh) is offset to one of the first and second side surfaces 1252 and 1254, the first position The magnetic field sensed by the sensor 1260 has only one of the first and second polarities. Accordingly, when the strength of the magnetic field of the first or second polarity linearly changes, the first position sensor 1260 may sense the magnetic field having the first or second polarity that changes linearly.

Referring to FIG. 34, while the first moving part 1220 moves from the lowest point as shown in FIG. 32 to the highest position as shown in FIG. 35, the first position sensor 1260 detects It can be seen that the change in the intensity of the magnetic field is linear.

Referring to FIGS. 34 and 35, it can be seen that the maximum displacement D1 to which the moving part 1220 of the lens driving apparatus 1200A illustrated in FIG. 32 can move is z1.

37 is a cross-sectional view of a lens driving apparatus 1200B according to another embodiment.

Unlike the lens driving device 1200A illustrated in FIG. 32, in the case of the lens driving device 1200B illustrated in FIG. 37, the center of the first position sensor 1260 in the initial state before the lens is moved in the optical axis direction. The first point of the first side 1252 may be viewed in the y-axis direction in which the height of (z=zh) is the magnetization direction. Here, the first point may be a point between the upper end 1251 and the lower end of the first side 1252, for example, the height of the middle of the first side 1252.

In the state before the moving part 1220 moves, the anode magnetized magnet 1250 of the lens driving device 1200B shown in FIG. 37 is more than the anode magnetized magnet 1250 of the lens driving device 1200A shown in FIG. 32. It can be located a certain distance (z2-zh) higher. In this case, referring to FIG. 34, the lowest value of the magnetic field having the first polarity detected by the first position sensor 1260 may be B2 greater than B0.

As a current is applied to the first coil in the lens driving apparatus illustrated in FIG. 37, the moving unit 1220 may move up and down to the maximum height z1 like the lens driving apparatus 1200A illustrated in FIG. 35. In this case, the maximum lifting height of the moving part 1220 may be changed by adjusting the elastic modulus of the lower spring 1230 and the upper spring 1240.

In the case of the lens driving apparatus 1200B shown in FIG. 37, similar to the lens driving apparatus 1200A shown in FIGS. 32 and 35, the intensity of the magnetic field sensed by the first position sensor 1260 is linear from B2 to B1. It can be seen that the enemy changes.

Referring to FIG. 36, it can be seen that the maximum displacement D1 to which the moving part 1220 of the lens driving apparatus 1200B shown in FIG. 37 can move is z1-z2.

38 is a cross-sectional view of a lens driving apparatus 1200C according to another embodiment.

In the case of the lens driving devices 1200A and 1200B illustrated in FIGS. 32, 35, or 37, the first side 1252 is positioned on the second side 1254.

On the other hand, the second side surface 1254 of the lens driving apparatus 200C illustrated in FIG. 38 may be positioned on the first side surface 1252. As described above, the lens driving apparatus 1200C shown in FIG. 38 except that the long second side 1252 on the side surface of the anode magnetized magnet 1250 is disposed below the shorter first side 1254 Since is the same as the lens driving apparatuses 1200A and 1200B shown in FIG. 32 or 37, the same reference numerals are used, and descriptions of overlapping parts are omitted.

39A and 39B are cross-sectional views of the anode magnetized magnet 1250 shown in FIG. 38 according to embodiments 1250C and 1250D, respectively.

Referring to FIG. 39A, the anode magnetization magnet 1250C includes first and second sensing magnets 1250C-1 and 1250C-2, or may further include a non-magnetic barrier wall 1250C-3.

Referring to FIG. 39B, the anode magnetized magnet 1250D includes first and second sensing magnets 1250D-1 and 1250D-2, or may further include a non-magnetic barrier wall 1250D-3.

According to an embodiment, as shown in FIG. 39A, the first and second sensing magnets 1250C-1 and 1250C-2 are spaced apart or in contact with each other in a direction parallel to the optical axis direction (ie, the z axis direction). Can be.

As shown in FIG. 39B, the first and second sensing magnets 1250D-1 and 1250D-2 may be spaced apart or in contact with each other in a magnetization direction (ie, a y-axis direction).

The anode magnetized magnet 1250 shown in FIG. 38 is shown to be a magnet having the structure shown in FIG. 39A, but may be replaced with a magnet having the structure shown in FIG. 39B.

In addition, as shown in FIG. 39A, the non-magnetic barrier wall 1250C-3 may be disposed between the first and second sensing magnets 1250C-1 and 1250C-2, and as shown in FIG. 39B The adult partition wall 1250D-3 may be disposed between the first and second sensing magnets 1250D-1 and 1250D-2. The non-magnetic barrier ribs 1250C-3 and 1250D-3 may include a section having little polarity as a portion substantially not having magnetic properties, and may be filled with air or include a non-magnetic material.

In addition, the third length L3 of the nonmagnetic partition walls 1250C-3 and 1250C-3 is 5% or more of the total length LT in a direction parallel to the optical axis direction of the anode magnetized magnets 1250C, 1250C, or It may be less than 50%.

34 and 37, in the initial state before the lens is moved in the optical axis direction, the intermediate height (z=zh) of the first position sensor 1260 is the nonmagnetic partition wall in the y-axis direction ( 1250C-3) (or the space between the first side 1252 and the second side 1254) may face or coincide.

This is, the upper end portion 1253 of the first side 1252 is located on a virtual horizontal plane HS2 extending in the y-axis direction, which is the magnetization direction, from the middle height (z=zh) of the first position sensor 1260 Can mean Alternatively, an intermediate height (z=zh) of the first position sensor 1260 may be located at a point between the upper end 1253 and the second side 1254.

In this way, when the moving part 1220 is stationary without moving, as shown in FIG. 38, when the anode magnetized magnet 1250 and the first position sensor 1260 are disposed, the first position sensor 1260 The strength of the magnetic field having the first polarity detected at may be '0'.

As shown in each of FIGS. 33A and 39A, the first side 1252 may correspond to a side surface of the first sensing magnets 1250A-1 and 1250C-1 facing the first position sensor 1260. .

In addition, as shown in FIGS. 33A and 39A, the second side 1254 may correspond to the side of the second sensing magnets 1250A-2 and 1250C-2 facing the first position sensor 1260. have.

Alternatively, as shown in each of FIG. 33B or 39B, the first and second side surfaces 1252 and 1254 are the first sensing magnets 1250B-1 and 1250D-1 facing the first position sensor 1260. May correspond to the side of.

40 is a cross-sectional view of a lens driving apparatus 1200D according to another embodiment.

Referring to FIG. 40, in the initial state before the lens is moved in the optical axis direction, the intermediate height (z=zh) of the first position sensor 1260 is the first side surface 1252 in the y-axis direction, which is the magnetization direction. You can look at the first point. Here, the first point may be a point between the upper end and the lower end of the first side 1252, for example, the height of the middle of the first side 1252.

In the state before the moving part 1220 moves, the anode magnetized magnet 1250 of the lens driving device 1200D shown in FIG. 40 is more than the anode magnetized magnet 1250 of the lens driving device 1200C shown in FIG. It can be located higher by the distance (z2-zh). In this case, referring to FIG. 34, the lowest intensity of the magnetic field having the first polarity detected by the first position sensor 1260 may be B2.

As a current is applied to the first coil of the lens driving device 1200D illustrated in FIG. 40, the moving unit 1220 may rise to the maximum height z1 like the lens driving device 1200A. At this time, the maximum height of the moving part 1220 can be adjusted with a mechanical stopper. Alternatively, the maximum height of the moving part 1220 may be changed by adjusting the elastic modulus of the lower spring 1230 and the upper spring 1240.

In the case of the lens driving device 1200D illustrated in FIG. 40, the first polarity sensed by the first position sensor 1260 is changed in the intensity of the magnetic field, similarly to the lens driving device 1200A illustrated in FIGS. 32 and 35. It can be seen that is linear from B2 to B1.

Referring to FIG. 36, it can be seen that the maximum displacement D1 to which the moving part 1220 of the lens driving apparatus 1200D illustrated in FIG. 40 can move is z1-z2.

In the lens driving apparatuses 1200A, 1200B, 1200C, and 1200D shown in FIGS. 32, 35, 37, 38, and 40 described above, the moving part 1220 is in one direction of the optical axis, that is, the +z axis from the initial position. You can only move in the direction. However, the embodiment is not limited thereto. That is, according to another embodiment, the lens driving device may move in both directions of the optical axis, that is, in the +z axis direction or the -z axis direction from the initial position as current is applied to the first coil. A configuration and operation of the lens driving apparatus according to this embodiment will be described as follows.

41 is a cross-sectional view of a lens driving apparatus 1200E according to another embodiment.

Unlike the lens driving devices 1200A and 1200B described above, the lens driving device 1200E illustrated in FIG. 41 may move from an initial position in the +z-axis direction or the -z-axis direction. Accordingly, the moving part 1220 has a shape floating in the air by the lower and upper springs 1230 and 1240. Except for this, the constituent elements of the lens driving apparatus 1200E shown in FIG. 41 are the same as the constituent elements of each of the lens driving apparatuses 1200A and 1200B described above, and thus a detailed and redundant description of each constituent element will be omitted.

Referring to FIG. 41, in an initial state before moving the lens in the optical axis direction, that is, in a state in which the moving part 1220 is stopped without moving, the height of the middle of the first position sensor 1260 (z=zh) May look toward the first point of the first side 1252 in the magnetization direction. Here, the first point may be a point between the upper end and the lower end of the first side 1252, for example, the intermediate height of the first side 1252.

42 is a cross-sectional view of a lens driving apparatus 1200F according to another embodiment.

Unlike the aforementioned lens driving devices 1200C and 1200D illustrated in FIGS. 38 and 40, the lens driving device 1200F illustrated in FIG. 42 may move in the +z axis direction or the -z axis direction. Accordingly, the moving part 1220 has a shape floating in the air by the lower and upper springs 1230 and 1240. Except for this, the constituent elements of the lens driving apparatus 1200F shown in FIG. 42 are the same as the constituent elements of each of the lens driving apparatuses 1200C and 1200D described above, and thus a detailed and redundant description of each constituent element will be omitted.

Referring to FIG. 42, in the initial state before the lens is moved in the optical axis direction, the height of the middle of the first position sensor 1260 (z=zh) is the first point of the first side 1252 in the magnetization direction. I can look. Here, the first point may be a point between the upper end and the lower end of the first side 1252, for example, the height of the middle of the first side 1252.

In the lens driving apparatuses 1200E and 1200F illustrated in FIG. 41 or 42, the ascending and descending motions of the moving part 1220 may be the same as in FIG. 34. Accordingly, operations of the lens driving apparatuses 1200E and 2100F shown in FIGS. 41 and 42 will be described with reference to FIG. 34 as follows.

In the lens driving apparatuses 1200E and 1200F, in an initial state before moving the lens in the optical axis direction, that is, in a state in which the moving part 1220 is stopped without moving up or down or in an initial position, the first position sensor ( When 1260 and the anode magnetized magnet 1250 are disposed as shown in FIGS. 41 and 42, the magnetic field of the first polarity sensed by the first position sensor 1260 may be B3. The initial magnetic field value detected by the first position sensor 1260 in a state in which the moving part 1220 is stopped without moving up or down or at an initial position is the separation distance between the first position sensor 1260 and the anode magnetized magnet 1250 The lights may be changed or adjusted according to the design values of these 1260 and 1250.

43 is a graph showing the displacement of the moving part 1220 according to the current supplied to the first coil in the lens driving devices 1200E and 1200F shown in FIGS. 41 and 42, and the horizontal axis is a current supplied to the first coil And the vertical axis represents the displacement. In addition, with respect to the vertical axis, a right side of the horizontal axis may indicate a constant current or a forward current or a + current, and the left side of the horizontal axis may indicate a reverse current or a reverse current or-

As the moving unit 1220 increases the intensity of the constant current applied to the first coil in a state in which the moving unit 1220 stops moving without moving as shown in Figs. 41 or 42, or at the initial position, the moving unit 1220 moves the distance in the +z-axis direction. You can get up and down (z=z4). In this case, referring to FIG. 34, the intensity of the magnetic field detected by the first position sensor 1260 may increase from B3 to B4.

Alternatively, the moving part 1220 increases the intensity of the reverse current applied to the first coil or moves in the +z-axis direction in a stopped state or initial position without moving as in FIG. 1 When the constant current supplied to the coil is reduced, the moving part 1220 may move downward. In this case, referring to FIG. 34, the strength of the magnetic field detected by the first position sensor 1260 may decrease from B3 to B5 or from B4 to B3.

As described above, it can be seen that the intensity of the magnetic field having the first polarity detected by the first position sensor 1260 of the lens driving devices 1200E and 1200F illustrated in FIG. 41 or 42 changes linearly between B5 and B4. have.

Referring to FIG. 43, in a situation where the moving part 1200 can move in both directions as described above, the upper displacement width D3 and the lower displacement width D2 of the moving part 1220 may be the same, or the upper displacement The width D3 may be larger than the lower displacement width D2.

If the upper displacement width (D3) is the same as the lower displacement width (D2), in the initial state before the lens is moved in the optical axis direction, the intermediate height (z=zh) of the first position sensor 1260 is magnetized. The direction of the y-axis direction may coincide with the above-described first point.

However, if the upper displacement width D3 is larger than the lower displacement width D2, the intermediate height of the first position sensor 1260 (z=) at the initial state or initial position before the lens is moved in the optical axis direction. zh) may look at a second point higher than the aforementioned first point in the y-axis direction, which is the magnetization direction. That is, when the upper displacement width (D3) is greater than the lower displacement width (D2) than the case where the upper displacement width (D3) is the same as the lower displacement width (D2), the first position sensor 1260 for the anode magnetized magnet 1250 ) Can be relatively higher.

In this case, the difference between the second point and the first point may be as shown in Equation 1 below.

Here, H2 is the height of the second point, H1 is the height of the first point, ΔD is the value obtained by subtracting the lower displacement width (D2) from the upper displacement width (D3) of the moving part 1220, and D is the movement It may mean the displacement width (D2+D3) of the part 1220.

44 shows the strength of the magnetic field (or output voltage) detected by the first position sensor 1260 according to the moving distance of the moving part 1220 in the optical axis direction, the first position sensor 1260 and the anode magnetized magnet 1250. -1, 1250-2) of each opposing state, the vertical axis represents the strength of the magnetic field (or output voltage), and the horizontal axis represents the moving distance of the moving part 220 in the optical axis direction.

In the case of the graph shown in FIG. 44, the structure of the anode magnetized magnet 1250 facing the first position sensor 1260 is the first and second sensing magnets 1250A-1 and 1250A-2 shown in FIG. 33A. Corresponds to. However, instead of the first and second sensing magnets 1250A-1 and 1250A-2 shown in FIG. 33A, the first and second sensing magnets 1250B-1 and 1250B-2 shown in FIG. 33B or FIG. The first and second sensing magnets 1250C-1 and 1250C-2 shown in 39a or the first and second sensing magnets 1250D-1 and 1250D-2 shown in FIG. 39B are used as a first position sensor ( 1260), the following description of FIG. 44 may be applied.

Referring to FIG. 44, as described above, a magnetic field sensed by the first position sensor 1260 and having an intensity that changes linearly may be a magnetic field 1272 of a first polarity, for example, an S-pole. However, the embodiment is not limited thereto. That is, according to another embodiment, a magnetic field sensed by the first position sensor 1260 and having a linearly varying intensity may be a second polarity, for example, an N-pole magnetic field 1274.

If a magnetic field having a linearly varying intensity sensed by the first position sensor 1260 is an N-pole magnetic field 1274 that is a second polarity instead of the first polarity, referring to FIG. 44, the lens is moved in the optical axis direction. In the initial state or initial position before moving in the z-axis direction, the intermediate height (z=zh) of the first position sensor 1260 may look at the first point of the second side surface 1254.

Here, the first point may be a point between the upper end and the lower end of the second side 1254, for example, the height of the middle of the second side 1254. Thereafter, when the lens is moved the highest in the +z-axis direction, which is the optical axis direction, the middle height (z=zh) of the first position sensor 1260 may coincide with a point lower than the lower end of the second side surface 1254. have.

In addition, the first section BP1 in which the magnetic field 1272 of the S pole is linear is greater than the second section BP2 in which the magnetic field 1274 of the N pole is linear. This is because the first length L1 of the first side 1252 having S-polarity is longer than the second length L2 of the second side 1254 having N-polarity.

However, the first side 1252 having a first length L1 that is longer than the second length L2 has an N polarity, and a second length L2 having a second length L2 shorter than the first length L1 When the side surface 1254 has S polarity, reference numeral 1272 shown in FIG. 44 may correspond to an N-polar magnetic field, and 1274 may correspond to a S-polar magnetic field. Although not shown, when the pole is changed as described above, the polarity of the Y-axis may be reversed.

45A and 45B are graphs showing the displacement of the magnetic field detected by the first position sensor 1260 by intensity. In each graph, the horizontal axis represents the magnetic field and the vertical axis represents the displacement.

If, in order to detect the magnetic field of the first section (BP1) having a larger linear section than the second section (BP2) shown in FIG. 44, the first position sensor 1260 and the anode magnetized magnet 1250 may be arranged. In this case, as shown in FIG. 45A, even when the detected magnetic field change is small, the displacement can be recognized.

However, relatively, to detect the magnetic field of the second section (BP2) having a smaller linear section than the first section (BP1) shown in FIG. 44, the position sensor 1260 and the anode magnetized magnet 1250 In the case of arrangement, as shown in FIG. 45B, when the detected magnetic field has a small change, the degree of recognizing a minute displacement is smaller than that of FIG. 45A. That is, the slope of FIG. 45A and FIG. 45B may be different from each other.

Therefore, as shown in FIG. 45A, the position sensor 1260 and the quantum magnetized magnet 1250 are disposed so that the position sensor 1260 detects the magnetic field of the first section BP1 that is larger than the second section BP2. In this case, the displacement can be detected with a much higher resolution. That is, as the linear section in which the intensity of the magnetic field changes is wider, the change in displacement for the coded magnetic field can be accurately checked.

Further, according to an embodiment, the strength of a magnetic field sensed by the position sensor 1260 and having a magnitude that changes linearly may be coded in 7 bits to 12 bits. In this case, the control unit (not shown) may precisely control the displacement of the moving unit 1220 through the position sensor 1260 including a look-up table (not shown).

In the lookup table, code values for each strength of a magnetic field may be matched to displacement and stored. For example, referring to FIG. 34, the strength of the magnetic field from the minimum magnetic field B0 to the maximum magnetic field B1 is matched with the displacement z, and may be coded into 7 to 12 bits. Accordingly, in order to control the displacement of the moving unit 1220, a corresponding code value is found, and the control unit may move the moving unit 1220 in the optical axis direction to a position matching the found code value. Such a control unit may be disposed or included in the image sensor, or may be disposed or included in the first circuit board on which the image sensor is mounted.

In addition, the length LT in the z-axis direction parallel to the optical axis direction of the anode magnetizing magnet 250 in the lens driving apparatuses 1200A to 1200F described above is the movable width of the moving part 1220, that is, 1.5 of the maximum displacement. It can be more than double. For example, referring to FIGS. 32 and 35, since the maximum displacement that is the movable width of the moving part 1220 is z1, the length LT of the anode magnetized magnet 1250 may be 1.5*z1 or more.

In addition, in the lens driving apparatuses 1200A to 1200F described above, the position sensor 1260 is coupled, contacted, supported, temporarily fixed, inserted, or seated on the fixed portion 1210, and the positive magnetized magnet 1250 on the moving portion 1220 ) Is combined, contacted, supported, fixed, temporarily fixed, inserted or seated. However, the embodiment is not limited thereto.

That is, according to another embodiment, the position sensor 1260 is coupled, contacted, supported, temporarily fixed, inserted or seated on the moving portion 1220, and the positive magnetized magnet 1250 is coupled to the fixed portion 1210 , May be supported, fixed, temporarily fixed, inserted or seated, in which case the above description may be applied.

46 is a graph for explaining a change in the intensity of a magnetic field according to a moving distance of the moving part 1220 of the lens driving apparatus of the comparative example. The horizontal axis represents the moving distance, and the vertical axis represents the intensity of the magnetic field.

If the first and second side lengths L1 and L2 in the optical axis direction of the first and second side surfaces 1252 and 1254 of the anode magnetized magnet 1250 are the same, the moving part 1220 moves. Accordingly, a change in the magnetic field detected by the position sensor 1260 may be as illustrated in FIG. 46. In this case, referring to FIG. 46, the magnetic field sensed by the position sensor 1260 has an opposite polarity around a mutual zone (MZ).

In this case, the mutual region MZ is an area in which the strength of the magnetic field sensed by the position sensor 1260 is fixed to '0' despite the movement of the moving unit 1220. This mutual area MZ may not be processed by software. Therefore, the position sensor 1260 can only detect the strength of the magnetic field as '0' in the mutual region MZ, and thus accurately measure and control the moving distance of the moving part 1220 moving in this section MZ. Can not.

However, according to the embodiment, the first length (L1) of the anode magnetized magnet 1250 is formed to be longer than the second length (L2), and the position sensor 1260 generates a magnetic field of a first polarity of a linearly varying intensity. Because the detection is performed, the same problem as in the comparative example described above can be prevented in advance. Accordingly, the design margin and reliability of the lens driving apparatuses 1200A to 1200F may be improved.

47 is a graph showing a change in a magnetic field detected by the position sensor 1260 according to the movement of the moving part 1220 in the lens driving apparatus according to the embodiment, wherein the horizontal axis represents the moving distance and the vertical axis represents the magnetic field.

If the third length L3 of the nonmagnetic partition walls 1250A-1 and 1250C-1 described above is reduced to 50% or less of the total length LT of the anode magnetized magnet 1250, as shown in FIG. Likewise, the mutual region MZ can be almost eliminated. In this case, the height of the middle of the position sensor 1260 (z=zh) may correspond to the height of the middle of the anode magnetized magnet 1250.

In this case, the intensity change of the magnetic field 1282 of the first polarity and the intensity change of the magnetic field 1284 of the second polarity may change substantially linearly. Accordingly, since the position sensor 1260 can detect both the magnetic field 1282 of the first polarity and the magnetic field 1284 of the second polarity that linearly change in intensity according to the movement of the moving unit 1220, the first And a magnetic field having a linearly varying intensity having only one of the second polarities may have a relatively higher resolution than when the position sensor 1260 senses the magnetic field.

In addition, when the third length L3 of the nonmagnetic barrier ribs 1250A-1 and 1250C-1 is 10% or more of the total length LT of the anode magnetized magnet 1250, the mutual region MZ of the magnetic field and Since the linear section is clearly separated, the position sensor 1260 can detect only a magnetic field having one of the first and second polarities and having an intensity that changes linearly.

Meanwhile, the lens driving apparatuses 100, 1200A to 1200F according to the above-described embodiment may be used in various fields, for example, camera modules. For example, the camera module can be applied to mobile devices such as cell phones.

The camera module of the embodiment includes a lens mounted, inserted, seated, contacted, coupled, fixed, supported or disposed in the lens driving apparatus 100, 1200A to 1200F, and the lens driving apparatus 100, 1200A to 1200F, An image sensor (not shown), a second circuit board (not shown) (or a main circuit board) on which the image sensor is disposed, and an optical system may be included below. In this case, the camera module according to the embodiment may further include a lens barrel coupled to the bobbin 110.

The lens barrel is as described above, and the second circuit board may form a bottom surface of the camera module from a portion on which the image sensor is mounted. In addition, the optical system may include at least one or more lenses for transmitting an image to the image sensor.

In FIGS. 32 to 47, the lens driving apparatus according to the described embodiment has been described mainly with a positive magnetized magnet (or a two-pole magnetized magnet) 1250 and a position sensor 1260, but FIGS. 32 to 47 According to the lens driving apparatus, the cover member 300, the housing 140, the second coil 230, the second circuit board 250, the base 210, and the second and third described in FIGS. 1 to 22 It may further include position sensors 240a and 240b.

Features, structures, effects, etc. described in the embodiments above are included in at least one embodiment of the present invention, and are not necessarily limited to only one embodiment. Further, the features, structures, effects, etc. illustrated in each embodiment may be combined or modified for other embodiments by a person having ordinary knowledge in the field to which the embodiments belong. Accordingly, contents related to such combinations and modifications should be construed as being included in the scope of the present invention.

110: bobbin 120: first coil
130: magnet 140: housing
150: upper elastic member 160: lower elastic member
210: base 230: second coil
240a, 240b: first and second position sensors 250: circuit board
300: cover member.

Claims (34)

A housing;
A bobbin disposed in the housing;
A first magnet disposed in the housing;
A first coil disposed on the bobbin;
A second magnet disposed on the bobbin;
A first position sensor disposed in the housing and corresponding to the second magnet;
A lower elastic member coupled to a lower portion of the bobbin and a lower portion of the housing;
A first circuit board electrically connected to the first position sensor;
A second coil facing the first magnet;
A second circuit board separated from the first circuit board, disposed under the lower elastic member, and electrically connected to the second coil; And
And a support member electrically connecting the first circuit board and the second circuit board,
The lower elastic member includes a first lower elastic member and a second lower elastic member spaced apart from the first lower elastic member,
One end of the first lower elastic member is connected to the first coil, the other end of the first lower elastic member is electrically connected to the first circuit board, and one end of the second lower elastic member is connected to the first coil And the other end of the second lower elastic member is electrically connected to the first circuit board. The method of claim 1,
Including a cover comprising a side,
The first circuit board is disposed between the second magnet and the side surface of the cover,
The first position sensor is a lens driving device for sensing the position of the bobbin. The method of claim 1,
A part of the first circuit board is connected to the first position sensor,
Another part of the first circuit board is connected to the lower elastic member. The method of claim 2,
The first position sensor overlaps the second magnet, the first circuit board, and the side surface of the housing in a direction perpendicular to the optical axis and the side surface of the cover. The method of claim 1,
Including an upper elastic member coupled to the upper portion of the bobbin and the upper portion of the housing,
One surface of the first circuit board is connected to the upper elastic member. The method of claim 1,
The first position sensor is a hall sensor including a driver and a lens driving device in which a driver is integrated. The method of claim 5,
The first circuit board,
A first upper surface portion disposed on the upper elastic member;
A first terminal surface bent at the first upper surface portion and having a plurality of first terminals; And
And a first pad disposed on the first upper surface and electrically connected to one end of the support member. The method of claim 1,
The housing,
An upper end on which the first circuit board is disposed;
A plurality of support portions connected to a lower portion of the upper end portion and supporting the first coil; And
It includes a through groove formed in the corner of the upper end,
The support member is a lens driving device passing through the through groove. The method of claim 1,
The housing comprises at least four sides,
The first circuit board is disposed on any one of the at least four side portions of the housing,
The support member includes a plurality of support members,
The first circuit board is electrically connected to a corresponding one of the plurality of support members. The method of claim 9,
The second circuit board is electrically connected to the first circuit board through the plurality of support members. A housing;
A bobbin disposed in the housing;
A first coil disposed on the bobbin;
A magnet disposed in the housing;
An upper elastic member and a lower elastic member coupled to the bobbin and the housing;
A first position sensor disposed in the housing and sensing a position of the bobbin;
A first circuit board electrically connected to the first position sensor;
A second circuit board disposed under the housing;
A second coil disposed on the second circuit board;
A support member electrically connecting the first circuit board and the second circuit board; And
And a first damper disposed on a part of the support member,
The lower elastic member includes a first lower elastic member and a second lower elastic member spaced apart from the first lower elastic member. The method of claim 11,
A second damper provided at a portion where the support member and the second circuit board are electrically connected,
One end of the first coil is electrically connected to the first circuit board through the first lower elastic member, and the other end of the first coil is electrically connected to the first circuit board through the second lower elastic member. Lens driving device connected. The method of claim 11,
The housing,
An upper end on which the first circuit board is disposed;
A plurality of support portions connected to a lower portion of the upper end portion and supporting the first coil; And
It is formed at the edge of the upper end, and includes a through groove through which the support member passes,
A lens driving device including a third damper provided between the through groove of the housing and the support member. The method of claim 11,
Each of the upper elastic member and the lower elastic member,
An inner frame connected to the bobbin;
An outer frame connected to the housing; And
It includes a connection portion connecting the inner frame and the outer frame,
Lens driving device comprising a fourth damper provided between the inner frame and the housing. A housing;
A bobbin disposed in the housing;
A first coil disposed on the bobbin;
A first magnet disposed in the housing;
A second magnet disposed on the outer peripheral surface of the bobbin;
A first position sensor sensing the position of the bobbin;
An upper elastic member and a lower elastic member coupled to the bobbin and the housing;
A first circuit board electrically connected to the upper elastic member;
A second circuit board disposed under the housing;
A second coil disposed on the second circuit board; And
And a support member electrically connecting the first circuit board and the second circuit board,
The second magnet,
A lens driving device that is an anode magnetized magnet disposed to face the first position sensor. The method of claim 15,
The second magnet,
A first side surface facing the first position sensor and having a first polarity; And
And a second side facing the first position sensor and disposed to be spaced apart or in contact with the first side in the optical axis direction, and having a second polarity opposite to the first side,
A lens driving device in which a length of the first side surface in the optical axis direction is greater than or equal to a length of the second side surface in the optical axis direction. The method of claim 15 or 16,
The second magnet,
First and second sensing magnets disposed to be spaced apart from each other; And
Including a non-magnetic barrier wall disposed between the first and second sensing magnets,
The lower elastic member includes a first lower elastic member and a second lower elastic member spaced apart from the first lower elastic member,
One end of the first coil is electrically connected to the first circuit board through the first lower elastic member, and the other end of the first coil is electrically connected to the first circuit board through the second lower elastic member. Lens driving device connected. The method of claim 1 or 15,
The lens driving device of the bobbin ascending or descending from an initial position in a first direction parallel to an optical axis by an electromagnetic interaction between the first magnet and the first coil. The method of claim 15,
The first position sensor is disposed in the housing, and the lens driving device is electrically connected to the first circuit board.






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