KR20210036763A - Lens driving device - Google Patents

Abstract

The present invention relates to a lens driving device. The lens driving device includes: a base; a housing; a bobbin; a magnet; a first coil; and a second coil. The bobbin includes a protruding part. The first coil includes: a first part placed on the protruding part of the bobbin; a second part placed under the protruding part of the bobbin; and a third part connecting the first and second parts. The inner surface of the magnet includes: a first area having a first polarity and opposed to the first part of the first coil on an initial position where a current is not applied to the first coil; a second area having a second polarity opposite to the first polarity and opposed to the second part of the first coil; and a third area placed between the first and second areas. The extent of the first area of the magnet is different from the extent of the second area of the magnet. Therefore, the present invention is capable of maintaining the linearity of lens driving and increasing the stroke range.

Description

Lens driving device

This embodiment relates to a lens driving device.

With the widespread use of various portable terminals and the commercialization of wireless Internet services, consumer demands related to portable terminals are diversifying, and various types of additional devices are being installed on portable terminals.

Among them, there is a camera module that takes a subject as a picture or video. Meanwhile, an auto focus function that automatically adjusts the focus according to the distance of the subject is applied to the camera module.

However, as the size and weight of the lenses have recently increased and the stroke range of lens movement has also increased, the electromagnetic force for driving the autofocus is insufficient during design, and the driving linearity is collapsed.

The present embodiment is to provide a lens driving device including an electromagnetic force securing structure for minimizing the size of the entire module in the situation of increasing the size and weight of the lens, maintaining linearity of lens driving and increasing the stroke range.

The lens driving apparatus according to the present embodiment includes a base; A housing spaced apart from the base; A bobbin disposed in the housing; A magnet disposed in the housing; A first coil disposed on the bobbin and facing the magnet; And a second coil disposed on the base and facing the magnet, wherein the magnet includes an inner surface facing the first coil, and the inner surface of the magnet has a first region having a first polarity, and the A second region spaced apart from the first region and disposed below the first region and having a second polarity opposite to the first polarity, and a third region disposed between the first region and the second region. And an area of the first area of the magnet may be different from an area of the second area of the magnet.

The bobbin includes a protrusion protruding from a side surface of the bobbin, and the first coil includes a first part disposed above the protrusion of the bobbin, a second part disposed below the protrusion of the bobbin, and the And a third portion connecting the first portion and the second portion, and the first region of the inner surface of the magnet is the first portion of the first coil at an initial position where no current is applied to the first coil. The second region may face a portion, and the second region may face the second portion of the first coil.

An area of the first area of the magnet may be smaller than an area of the second area of the magnet.

In the initial position, the distance in the optical axis direction between the upper end of the first portion of the first coil and the lower end of the first region of the first region of the magnet is the upper end of the first portion of the first coil And 80% or more of the distance in the optical axis direction between the lower end of the first portion of the first coil.

In the initial position, the first portion of the first coil may overlap the first region and the third region of the magnet in a direction perpendicular to an optical axis.

In the initial position, the second portion of the first coil may overlap the second region of the magnet in a direction perpendicular to the optical axis.

In the initial position, the third portion of the first coil may overlap the second and third regions of the magnet in a direction perpendicular to an optical axis.

The magnet includes a first magnet, and second and third magnets disposed opposite to each other, and the first coil includes a first-first coil facing the second magnet, and a third magnet facing the third magnet. Including 1-2 coils, wherein the second coil includes a second coil 2-1 facing the first magnet, a 2-2 coil facing the second magnet, and a second coil facing the third magnet. -It can contain 3 coils.

The lens driving device may include a dummy member disposed on the housing opposite to the third magnet.

The first magnet may be a two-pole magnetized magnet, and the second and third magnets may be four-pole magnetized magnets.

The lens driving device may include a fourth magnet disposed on the bobbin; A substrate disposed on the base; And a sensor disposed on the substrate and sensing the fourth magnet, and the second coil may be disposed on the substrate.

The length in the long side direction of the inner surface of the magnet is longer than the length in the corresponding direction of the first coil, and the length in the short side direction of the inner surface of the magnet is less than the length in the corresponding direction of the first coil It can be long.

A length of the magnet in a direction of a long side of the inner surface may correspond to a length of the second coil in a corresponding direction.

The camera module according to the present embodiment includes a printed circuit board; An image sensor disposed on the printed circuit board; A lens driving device disposed on the printed circuit board; And a lens coupled to the bobbin of the lens driving device.

When a driving current in a first direction is applied to the first coil, the bobbin moves in a first stroke in a direction away from the image sensor, and drives the first coil in a second direction opposite to the first direction. When a current is applied, the bobbin moves within a second stroke in a direction closer to the image sensor, and the first stroke may be longer than the second stroke.

The lens driving apparatus according to the present embodiment includes a housing; A bobbin disposed in the housing; A magnet disposed in the housing; A first coil disposed on the bobbin and facing the magnet; And a second coil disposed below the magnet and facing the magnet, wherein the bobbin includes a protrusion protruding from a side surface of the bobbin, and the first coil is a second coil disposed above the protrusion of the bobbin. A first portion, a second portion disposed under the protruding portion of the bobbin, and a third portion connecting the first portion and the second portion, and the magnet includes an N-pole and an S-pole. And a second magnet portion disposed below the first magnet portion and including an N-pole and an S-pole, and a neutral portion disposed between the first magnet portion and the second magnet portion, and the second magnet portion The first portion of one coil may overlap the first magnet portion and the neutral portion in a direction perpendicular to the optical axis at an initial position where no current is applied to the first coil.

Through this embodiment, the linearity of lens driving is maintained and the stroke range can be increased.

In addition, the size of the camera module including the lens driving device can be minimized.

1 is a perspective view of a lens driving apparatus according to the present embodiment.
FIG. 2 is a cross-sectional view taken along AA of FIG. 1.
3 is a cross-sectional view taken along BB of FIG. 1.
4 is a cross-sectional view as viewed from CC of FIG. 1.
5 is a bottom view of the lens driving apparatus according to the present embodiment.
6 is a perspective view illustrating a state in which a cover is removed from the lens driving apparatus of FIG. 1.
7 is an exploded perspective view of the lens driving apparatus according to the present embodiment.
8 to 10 are exploded perspective views of some configurations of the lens driving apparatus according to the present embodiment.
11 is a perspective view showing an arrangement structure of a coil, a magnet, and a dummy member according to the present embodiment.
12 is a side view of the configuration of FIG. 11 viewed from the side.
13 is a side view of a coil and a magnet of the lens driving apparatus according to the present embodiment.
14 is a graph for comparing the driving linearity of Comparative Example (a) and this Example (b).
15 is an exploded perspective view of the camera module according to the present embodiment.
16 is a perspective view of an optical device according to the present embodiment.
17 is a configuration diagram of an optical device according to the present embodiment.

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

However, the technical idea of the present invention is not limited to some embodiments to be described, but may be implemented in various different forms, and within the scope of the technical idea of the present invention, one or more of the constituent elements may be selectively selected between the embodiments. It can be used by combining or replacing with.

In addition, terms (including technical and scientific terms) used in the embodiments of the present invention are generally understood by those of ordinary skill in the art, unless explicitly defined and described. It can be interpreted as a meaning, and terms generally used, such as terms defined in a dictionary, may be interpreted in consideration of the meaning in the context of the related technology.

In addition, terms used in the embodiments of the present invention are for describing the embodiments and are not intended to limit the present invention.

In the present specification, the singular form may also include the plural form unless specifically stated in the phrase, and when described as "at least one (or more than one) of A and (and) B and C", it is combined with A, B, and C. It may contain one or more of all possible combinations.

In addition, in describing the constituent elements of the exemplary embodiment of the present invention, terms such as first, second, A, B, (a), (b) may be used. These terms are only for distinguishing the constituent element from other constituent elements, and are not limited to the nature, order, or order of the constituent element by the term.

And, when a component is described as being'connected','coupled', or'connected' to another component, the component is directly'connected','coupled', or'connected' to the other component. In addition to the case, it may include a case in which the component is'connected','coupled', or'connected' due to another component between the component and the other component.

In addition, when described as being formed or disposed in the "top (top)" or "bottom (bottom)" of each component, "top (top)" or "bottom (bottom)" means that the two components are directly It includes not only the case of contact, but also the case where one or more other components are formed or disposed between the two components. In addition, when expressed as "upper (upper)" or "lower (lower)", the meaning of not only an upward direction but also a downward direction based on one component may be included.

The'optical axis (refer to OA of FIG. 6) direction' used hereinafter is defined as the optical axis direction of the lens and/or image sensor coupled to the lens driving device.

The'vertical direction' used below may be a direction parallel to the optical axis direction. The vertical direction may correspond to the'z-axis direction (see FIG. 6)'. The'horizontal direction' used below may be a direction perpendicular to the vertical direction. That is, the horizontal direction may be a direction perpendicular to the optical axis. Accordingly, the horizontal direction may include the'x-axis direction' and the'y-axis direction' (see FIG. 6).

The'auto focus function' used below automatically adjusts the distance to the image sensor by moving the lens in the optical axis direction according to the distance of the subject so that a clear image of the subject can be obtained by the image sensor. Defined by function. On the other hand,'auto focus' may correspond to'AF (auto focus)'. In addition,'closed-loop auto focus (CLAF) control' detects the distance between the image sensor and the lens and controls the position of the lens in real time to improve the accuracy of focus adjustment. It is defined as

The'image stabilization function' used below is defined as a function of moving the lens to compensate for external force, for example, lens movement and vibration caused by the user's hand shake so that a clear image of the subject can be obtained by the image sensor. . On the other hand, the'handshake correction function' may correspond to'Optical Image Stabilization (OIS)'.

Hereinafter, a configuration of a lens driving apparatus according to the present embodiment will be described with reference to the drawings.

1 is a perspective view of a lens driving apparatus according to the present embodiment, FIG. 2 is a cross-sectional view from AA of FIG. 1, FIG. 3 is a cross-sectional view of BB of FIG. 1, and FIG. 4 is a cross-sectional view of CC of FIG. 5 is a bottom view of the lens driving apparatus according to the present embodiment, FIG. 6 is a perspective view of a state in which a cover is removed from the lens driving apparatus of FIG. 1, and FIG. 7 is an exploded perspective view of the lens driving apparatus according to the present embodiment. 8 to 10 are exploded perspective views of some configurations of the lens driving apparatus according to the present embodiment, FIG. 11 is a perspective view showing an arrangement structure of a coil, a magnet, and a dummy member according to the present embodiment, and FIG. 12 is 11 is a side view as viewed from the side, and FIG. 13 is a side view of a coil and a magnet of the lens driving apparatus according to the present embodiment.

The lens driving device 10 may be a voice coil motor (VCM). The lens driving device 10 may be a lens driving motor. The lens driving device 10 may be a lens driving motor. The lens driving device 10 may be a lens driving actuator. In this embodiment, the lens driving apparatus 10 may include a CLAF OIS actuator or a CLAF OIS module. For example, a state in which a lens, an image sensor, and a printed circuit board are assembled to the lens driving device 10 may be understood as a camera module.

The lens driving device 10 may include a cover 100. The cover 100 may cover the housing 310. The cover 100 may be coupled to the base 410. The cover 100 may form an internal space between the base 410 and the base 410. The cover 100 may accommodate the housing 310 therein. The cover 100 may accommodate the bobbin 210 therein. The cover 100 may form the exterior of the first camera module. The cover 100 may have a hexahedral shape with an open bottom surface. The cover 100 may be a non-magnetic material. The cover 100 may be formed of a metal material. The cover 100 may be formed of a metal plate. The cover 100 may be connected to a ground portion of a printed circuit board. Through this, the cover 100 may be grounded. The cover 100 may block electromagnetic interference (EMI). In this case, the cover 100 may be referred to as'shield can' or'EMI shield can'.

The cover 100 may include an upper plate 110. The cover 100 may include a side plate 120. The cover 100 may include an upper plate 110 and a side plate 120 extending downward from an outer periphery or edge of the upper plate 110. The lower end of the side plate 120 of the cover 100 may be disposed at the step 412 of the base 410. The inner surface of the side plate 120 of the cover 100 may be fixed to the base 410 by an adhesive.

The cover 100 may include a plurality of side plates. The cover 100 may include a plurality of side plates and a plurality of corners formed by the plurality of side plates. The cover 100 may include four side plates and four corners formed between the four side plates. The cover 100 may include a first side plate, a second side plate disposed opposite the first side plate, and a third side plate and a fourth side plate disposed opposite each other between the first side plate and the second side plate. The cover 100 may include first to fourth corners. The cover 100 may include a first corner, a second corner disposed opposite the first corner, and a third corner and a fourth corner disposed opposite each other.

The lens driving device 10 may include a first mover 200. The first mover 200 may be coupled to the lens. The first mover 200 may be connected to the second mover 300 through the first elastic member 500. The first mover 200 may move through interaction with the second mover 300. In this case, the first mover 200 may move integrally with the lens. Meanwhile, the first mover 200 may move when driving the AF. In this case, the first mover 200 may be referred to as an'AF mover'. Meanwhile, the first mover 200 may move together with the second mover 300 when the OIS is driven. The first mover 200 may include a bobbin 210 and a first coil 220.

The first mover 200 may include a bobbin 210. The bobbin 210 may be disposed within the housing 310. The bobbin 210 may be movably coupled to the housing 310. The bobbin 210 may move in the optical axis direction with respect to the housing 310.

The bobbin 210 may include a protrusion 211. The protrusion 211 may protrude from the side of the bobbin 210. The first coil 220 may be fixed to the protrusion 211. The protrusion 211 may be inserted into the hollow of the ring-shaped first coil 220. The first coil 220 may be wound around the protrusion 211. The protrusion 211 may be formed on a first side of the bobbin 210 and a second side of the bobbin 210 opposite to the first side. The protrusion 211 may include a plurality of protrusions. The protrusion 211 may include two protrusions.

The bobbin 210 may include a hole 212. The hole 212 may be a hollow hole. A lens may be coupled to the hole 212. A thread may be formed on the inner circumferential surface of the hole 212 of the bobbin 210. Alternatively, the inner circumferential surface of the hole 212 of the bobbin 210 may be formed in a curved surface without a thread. The bobbin 210 may include a first protrusion coupled to the first elastic member 500. The first protrusion of the bobbin 210 may be inserted into and coupled to a corresponding hole of the first elastic member 500. The bobbin 210 may include a groove in which the fourth magnet 230 is disposed. The fourth magnet 230 may be inserted and coupled to the groove of the bobbin 210 from the lower side.

The bobbin 210 may include a stopper 213. The stopper 213 may be formed on the side of the bobbin 210. The stopper 213 may protrude toward the side of the bobbin 210. The stopper 213 may be disposed in the second groove 313 of the housing 310. The stopper 213 may be formed in a shape corresponding to the second groove 313 of the housing 310. The stopper 213 may be caught by the housing 310 to prevent movement and rotation of the bobbin 210 downward.

The bobbin 210 may be coupled to one or more of the first elastic member 500, the first coil 220, and the fourth magnet 230 by an adhesive. In this case, the adhesive may be an epoxy cured by at least one of heat, laser, and ultraviolet (UV) light.

The first mover 200 may include a first coil 220. The first coil 220 may be an'AF coil'. The first coil 220 may be disposed on the bobbin 210. The first coil 220 may be disposed in contact with the bobbin 210. The first coil 220 may be disposed between the bobbin 210 and the housing 310. The first coil 220 may be disposed on the outer circumference of the bobbin 210. The first coil 220 may be directly wound on the bobbin 210. The first coil 220 may face the magnet 320. The first coil 220 may electromagnetically interact with the magnet 320. When an electric current is supplied to the first coil 220 and an electromagnetic field is formed around the first coil 220, the first coil 220 is caused by an electromagnetic interaction between the first coil 220 and the magnet 320. It can move with respect to the magnet 320.

The first coil 220 may include a plurality of coils. The first coil 220 may include two coils. The first coil 220 may include a 1-1 coil 220-1 and a 1-2 coil 220-2. The 1-1th coil 220-1 may face the second magnet 320-2. The 1-2 coil 220-2 may face the third magnet 320-3. The 1-1 coil 220-1 is disposed on the first side of the bobbin 210, and the 1-2 coil 220-2 is disposed on the second side opposite to the first side of the bobbin 210. I can. Each of the 1-1 coil 220-1 and the 1-2 coil 220-2 may be formed in a ring shape, a donut shape, or an oval shape. At this time, each of the 1-1 coil 220-1 and the 1-2 coil 220-2 may be referred to as a'glass coil'.

The first coil 220 may include first to third portions 221, 222, and 223. The first part 221 of the first coil 220 may be disposed on the protrusion 211 of the bobbin 210. The second portion 222 of the first coil 220 may be disposed under the protrusion 211 of the bobbin 210. The third portion 223 of the first coil 220 may connect the first portion 221 and the second portion 222.

The first mover 200 may include a fourth magnet 230. The fourth magnet 230 may be a'sensing magnet'. The fourth magnet 230 may be disposed on the bobbin 210. The fourth magnet 230 may be disposed adjacent to the first sensor 440. The fourth magnet 230 may be disposed to face the first sensor 440. The fourth magnet 230 may be inserted into the groove of the bobbin 210 from below. The fourth magnet 230 may be a two-pole magnetized magnet or a four-pole magnetized magnet. The fourth magnet 230 may be disposed at a corner of the bobbin 210. As the fourth magnet 230 is disposed at the corner of the bobbin 210, magnetic field interference between the magnet 320 and the fourth magnet 230 disposed to face the side surface of the bobbin 210 may be minimized.

The first mover 200 may include a compensation magnet as a modification. The compensation magnet may be provided for magnetic field balance with the fourth magnet 230. The compensation magnet may be disposed on the bobbin 210. The compensation magnet may be disposed on the opposite side of the fourth magnet 230 with respect to the optical axis.

The lens driving device 10 may include a second actuator 300. The second movable member 300 may be movably coupled to the stator 400 through the second elastic member 600. The second mover 300 may support the first mover 200 through an elastic member. The second mover 300 may move the first mover 200 or may move together with the first mover 200. The second movable member 300 may move through interaction with the stator 400. The second operator 300 can move when the OIS is driven. At this time, the second mover 300 may be referred to as an'OIS mover'.

The second mover 300 may include a housing 310. The housing 310 may be spaced apart from the base 410. The housing 310 may be disposed within the cover 100. The housing 310 may be disposed between the cover 100 and the bobbin 210. The housing 310 may be disposed outside the bobbin 210. The housing 310 may accommodate at least a part of the bobbin 210. The housing 310 may be formed of a material different from that of the cover 100. The housing 310 may be formed of an insulating material. The housing 310 may be formed of an injection product. The housing 310 may be spaced apart from the side plate 120 of the cover 100.

The housing 310 may include a hole 311. The hole 311 may be a hollow hole. The hole 311 may be formed vertically through the center of the housing 310. The bobbin 210 may be disposed in the hole 311 of the housing 310. The housing 310 may include a first protrusion coupled to the first elastic member 500. The first protrusion of the housing 310 may be inserted into and coupled to a corresponding hole of the first elastic member 500. The housing 310 may include a second hole through which the second elastic member 600 passes.

The housing 310 may include a first groove 312. The first groove 312 may be a'magnet receiving groove' and/or a'dummy member receiving groove'. The housing 310 may include a first groove 312 in which the magnet 320 and the dummy member 330 are disposed. The first groove 312 of the housing 310 may be a groove recessed from the lower surface of the housing 310.

The housing 310 may include a second groove 313. The second groove 313 may be a stopper receiving groove. The second groove 313 may be formed on the upper surface of the housing 310. The second groove 313 accommodates at least a part of the stopper 213 of the bobbin 210 so that when the bobbin 210 rotates, the stopper 213 of the bobbin 210 is caught on the inner surface of the second groove 313 It can be formed to be. In addition, the second groove 313 may include a bottom surface facing the bottom surface of the stopper 213 of the bobbin 210 and overlapping in the optical axis direction. When the bobbin 210 moves downward, the stopper 213 may be caught on the bottom surface of the second groove 313 and the lower stroke of the bobbin 210 may be limited.

The housing 310 may be coupled to one or more of the first elastic member 500, the magnet 320, and the dummy member 330 by an adhesive. In this case, the adhesive may be an epoxy cured by at least one of heat, laser, and ultraviolet (UV) light.

The housing 310 may include four sides and four corner portions disposed between the four sides. The housing 310 includes a first side portion disposed corresponding to the first side plate of the side plate 120 of the cover 100, a second side portion disposed corresponding to the second side plate, and a third side plate disposed corresponding to the third side plate. It may include a third side portion and a fourth side portion disposed to correspond to the fourth side plate.

The second mover 300 may include a magnet 320. The magnet 320 may be a'driving magnet'. The magnet 320 may be disposed in the housing 310. The magnet 320 may be disposed between the bobbin 210 and the housing 310. The magnet 320 may face the first coil 220. The magnet 320 may electromagnetically interact with the first coil 220. The magnet 320 may face the second coil 430. The magnet 320 may electromagnetically interact with the second coil 430. The magnet 320 may be commonly used for AF driving and OIS driving. The magnet 320 may be disposed at a corner of the housing 310. In this case, the magnet 320 may be a corner magnet whose inner surface is larger than the outer surface of the opposite side. The magnet 320 may be disposed in each of the remaining three corners of the cover 100 except for the first corner of the four corners.

The magnet 320 may include a plurality of magnets. The magnet 320 may include three magnets. The magnet 320 may include four magnets. The magnet 320 may include a first magnet 320-1, a second magnet 320-2 and a third magnet 320-3. The first magnet 320-1 and the dummy member 330 may be disposed opposite to each other. The second and third magnets 320-2 and 320-3 may be disposed opposite to each other.

The first magnet 320-1 may be used for driving the OIS in the X direction. The second magnet 320-2 and the third magnet 320-3 may be used for driving the AF and OIS in the Y direction. The first magnet 320-1 may face the 2-1 coil 430-1 of the second coil 430. The second magnet 320-2 may face the 1-1 coil 220-1 of the first coil 220 and the 2-2 coil 430-2 of the second coil 430. have. The third magnet 320-3 may face the 1-2 coil 220-2 of the first coil 220 and face the 2-3 coil 430-3 of the second coil 430. have.

The first magnet 320-1 may be a two-pole magnetized magnet. The first magnet 320-1 may be a two-pole magnet. The first magnet 320-1 may be a two-pole magnet having different inner and outer polarities. For example, the inner surface of the first magnet 320-1 may be an N-pole, and the outer surface of the first magnet 320-1 may be an S-pole. Conversely, the inner surface of the first magnet 320-1 may be an S pole, and the outer surface of the first magnet 320-1 may be an N pole. However, as a modified example, the first magnet 320-1 may be a 4-pole magnet. The first magnet 320-1 may be formed larger than each of the second magnet 320-2 and the third magnet 320-3.

The second magnet 320-2 and the third magnet 320-3 may be 4-pole magnetized magnets. The second magnet 320-2 and the third magnet 320-3 may be 4-pole magnets. The four-pole magnetized magnet may include a neutral portion disposed in a horizontal direction in the center. Here, the neutral portion may be a void. The second magnet 320-2 and the third magnet 320-3 may be positively magnetized. As the second magnet 320-2 and the third magnet 320-3 are positively magnetized, the AF electromagnetic force may be maximized. Each of the second magnet 320-2 and the third magnet 320-3 may be a four-pole magnet having an upper portion of the inner surface having a different polarity from a lower portion of the inner surface and an upper portion of the outer surface, and the same polarity as the lower portion of the outer surface. An upper portion of the inner surface and a lower portion of the outer surface of the second magnet 320-2 may be an N-pole, and a lower portion of the inner surface and an upper portion of the outer surface of the second magnet 320-2 may be an S-pole. Conversely, an upper portion of the inner surface and a lower portion of the outer surface of the second magnet 320-2 may be an S-pole, and a lower portion of the inner surface and an upper portion of the outer surface of the second magnet 320-2 may be an N-pole. An upper portion of the inner surface and a lower portion of the outer surface of the third magnet 320-3 may be an N-pole, and a lower portion of the inner surface and an upper portion of the outer surface of the third magnet 320-3 may be an S-pole. Conversely, an upper portion of an inner surface and a lower portion of an outer surface of the third magnet 320-3 may be an S-pole, and a lower portion of the inner surface and an upper portion of the outer surface of the third magnet 320-3 may be an N-pole.

The magnet 320 may include an inner surface facing the first coil 220. The inner surface of the magnet 320 may include first to third regions 321, 322, and 323. At an initial position where no current is applied to the first coil 220, the first region 321 may face the first portion 221 of the first coil 220. The second region 322 may face the second portion 222 of the first coil 220. The first region 321 may have a first polarity, and the second region 322 may have a second polarity opposite to the first polarity. The third region 323 may be disposed between the first region 321 and the second region 322.

In this embodiment, in the AF driving magnet of the 4-pole method, the position of the air gap is not located in the center, but the position of the air gap is adjusted according to the driving range of the forward and reverse strokes. It can include a method. Since the size of the actuator is constantly getting smaller, it is difficult to control the size of the magnet or the coil, so this embodiment may be more effective.

For example, when optimizing the position of the air gap in the driving condition of a forward stroke of 320 μm and a reverse stroke of -30 μm, the height of the first region 321 is increased from 1.7 mm to 0.55 mm. In addition, the height of the third region 323 may be set to 0.3 mm, and the height of the second region 322 may be set to 0.85 mm.

The area of the first area 321 of the magnet 320 may be different from the area of the second area 322 of the magnet 320. The area of the first area 321 of the magnet 320 may be smaller than the area of the second area 322 of the magnet 320. As a modification, the area of the first area 321 of the magnet 320 may be larger than the area of the second area 322 of the magnet 320.

In the initial position, the distance in the optical axis direction between the upper end of the first portion 221 of the first coil 220 and the lower end of the first region 321 of the first region 321 of the magnet 320 (Fig. 13 L1 of) is the distance in the optical axis direction between the upper end of the first part 221 of the first coil 220 and the lower end of the first part 221 of the first coil 220 (see L2 in FIG. 13) It may be more than 80% of the In this embodiment, the area where the first portion 221 of the first coil 220 and the first region 321 of the magnet 320 overlap in a direction perpendicular to the optical axis is the first portion of the first coil 220 ( The electromagnetic force is lost to around 10% only when the area of 221) is at least 60%. Since the position of the first coil 220 is not fixed due to the posture difference due to the weight and gravity of the AF driving unit, L1 / L2 is At least 80% needs to be secured.

In the initial position, the first portion 221 of the first coil 220 may overlap the first region 321 and the third region 323 of the magnet 320 in a direction perpendicular to the optical axis. In the initial position, the second portion 222 of the first coil 220 may overlap the second region 322 of the magnet 320 in a direction perpendicular to the optical axis. In the initial position, the third portion 223 of the first coil 220 may overlap the second region 322 and the third region 323 of the magnet 320 in a direction perpendicular to the optical axis.

The length in the long side direction of the inner surface of the magnet 320 is longer than the length in the corresponding direction of the first coil 220, and the length in the short side direction of the inner surface of the magnet 320 corresponds to the first coil 220 It can be longer than the length in the direction you want. The length of the inner surface of the magnet 320 in the long side direction may correspond to the length of the second coil 430 in a corresponding direction.

The magnet 320 may include a first magnet part 326, a second magnet part 327, and a neutral part 327. The first magnet part 326 may include an N pole and an S pole. The second magnet part 327 is disposed under the first magnet part 326 and may include an N pole and an S pole. The neutral part 328 may be disposed between the first magnet part 326 and the second magnet part 327. The first part 221 of the first coil 220 overlaps the first magnet part 326 and the neutral part 328 in a direction perpendicular to the optical axis at an initial position where no current is applied to the first coil 220 Can be. The length of the first magnet portion 326 in the optical axis direction may be shorter than the length of the second magnet portion 327 in the optical axis direction.

14 is a graph shown to compare the driving linearity of Comparative Example (a) and this Example (b). The comparative example is an embodiment in which the height of the first region 321 and/or the first magnet part 326 and the height of the second region 322 and/or the second magnet part 327 are the same, and this embodiment Is an embodiment in which the height of the first region 321 and/or the first magnet part 326 is formed to be shorter than the height of the second region 322 and/or the second magnet part 327. When comparing (a) and (b) of FIG. 17, it can be seen that the linearity is increased in (b), which is the present embodiment.

The second mover 300 may include a dummy member 330. The dummy member 330 may be disposed in the housing 310 on the opposite side of the third magnet 320-3. The weight of the dummy member 330 may correspond to the weight of the first magnet 320-1. However, the dummy member 330 may have a weight less than that of the first magnet 320-1. Alternatively, the dummy member 330 may have a weight greater than that of the first magnet 320-1. The dummy member 330 may be within 80% of the weight of the first magnet 320-1 to 120% of the weight of the first magnet 320-1. If the weight of the dummy member 330 is less than the lower limit or exceeds the upper limit of the aforementioned value, the weight balancing of the OIS driving unit may be broken.

The dummy member 330 may be a non-magnetic material. The dummy member 330 may include a non-magnetic material. The magnetic strength of the dummy member 330 may be weaker than that of the first magnet 320-1. The dummy member 330 may be disposed to align the center of gravity on the opposite side of the first magnet 320-1. The dummy member 330 may be made of 95% or more tungsten as a material. That is, the dummy member 330 may be a tungsten alloy. For example, the specific gravity of the dummy member 330 may be 18000 or more. The dummy member 330 may be disposed at a position symmetrical to the first magnet 320-1 with respect to the central axis of the housing 310. In this case, the central axis of the housing 310 may correspond to the optical axis. The dummy member 330 may have a thickness corresponding to the first magnet 320-1 in a direction perpendicular to the optical axis.

The lens driving device 10 may include a stator 400. The stator 400 may be disposed under the first and second movable members 200 and 300. The stator 400 may support the second movable member 300 to be movable. The stator 400 may move the second movable member 300. In this case, the first mover 200 may also move together with the second mover 300.

The stator 400 may include a base 410. The base 410 may be disposed under the housing 310. The base 410 may be disposed under the bobbin 210. The base 410 may be spaced apart from the housing 310 and the bobbin 210. The base 410 may be disposed under the first substrate 420. The base 410 may be coupled to the cover 100. The base 410 may be disposed on a printed circuit board. The base 410 may be disposed between the housing 310 and the printed circuit board.

The base 410 may include a hole 411. The hole 411 may be a sensor accommodation hole. The hole 411 may penetrate the base 410 in the optical axis direction. The first sensor 440 and the second sensor 450 may be disposed in the hole 411. The holes 411 may be formed in a size and number corresponding to the first sensor 440 and the second sensor 450. As a variant, the hole 411 may be formed as a groove. In this case, the groove may be formed on the upper surface of the base 410.

The base 410 may include a step 412. The step 412 may be formed on the side of the base 410. The step 412 may be formed on the outer peripheral surface of the base 410. The step 412 may be formed by protruding a lower portion of the side surface of the base 410. The lower end of the side plate 120 of the cover 100 may be disposed at the step 412.

The base 410 may include a first groove 413. The first groove 413 may be a terminal receiving groove. The first groove 413 may be formed on a side surface of the base 410. The terminal portion 422 of the first substrate 420 may be disposed in the first groove 413. The first groove 413 may be formed to have a width corresponding to the width of the first substrate 420. The first groove 413 may be formed on two side surfaces of the base 410 that are disposed on opposite sides of the plurality of side surfaces, respectively.

The base 410 may include a second groove 414. The second groove 414 may be formed on the lower surface of the base 410. The second groove 414 may provide a space for a sensor base or an image sensor.

The base 410 may include a hollow hole. The hollow hole may have a base 410 formed in the center. The hollow hole may penetrate the base 410 in the optical axis direction. The hollow hole may be formed between the lens and the image sensor.

The stator 400 may include a substrate 420. The first substrate 420 may be disposed on the base 410. The first substrate 420 may be disposed on the upper surface of the base 410. The first substrate 420 may be disposed between the housing 310 and the base 410. A second elastic member 600 may be coupled to the first substrate 420. The first substrate 420 may supply power to the second coil 430. The first substrate 420 may be coupled to the substrate portion 435. The first substrate 420 may be coupled to the second coil 430. The first substrate 420 may be coupled to a printed circuit board disposed under the base 410. The first substrate 420 may include a flexible printed circuit board (FPCB). The first substrate 420 may be partially bent.

The substrate 420 may include a body portion 421. The body portion 421 may be disposed on the upper surface of the base 410. The first substrate 420 may include a first hole formed in the center of the body portion 421. The first hole may be formed between the lens and the image sensor. The first substrate 420 may include a second hole. The second hole may penetrate the first substrate 420 in a vertical direction. The wire of the second elastic member 600 may pass through the second hole of the first substrate 420. The first substrate 420 may include a ground portion. The ground portion may extend from the side surface of the body portion 421 to be bent. The ground portion may be disposed on the side of the base 410 to contact the inner surface of the side plate 120 of the cover 100. Through this, the cover 100 may be electrically connected to and grounded with the first substrate 420.

The substrate 420 may include a terminal portion 422. The terminal portion 422 may be bent downward from the body portion 421 to extend. The terminal portion 422 may be disposed on two side surfaces of the first substrate 420 that are opposite to each other. A terminal may be disposed on the outer surface of the terminal portion 422. The terminal may include a plurality of terminals. The terminals of the first substrate 420 may be coupled to the terminals of the printed circuit board by soldering.

The stator 400 may include a second coil 430. The second coil 430 may be an'OIS coil'. The second coil 430 may be disposed on the base 410. The second coil 430 may be formed on the substrate portion 435. The second coil 430 may be disposed on the first substrate 420. The second coil 430 may face the magnet 320. The second coil 430 may electromagnetically interact with the magnet 320. In this case, when current is supplied to the second coil 430 and a magnetic field is formed around the second coil 430, the magnet 320 due to electromagnetic interaction between the second coil 430 and the magnet 320 May move with respect to the second coil 430. The second coil 430 may move the housing 310 and the bobbin 210 with respect to the base 410 in a direction perpendicular to the optical axis through electromagnetic interaction with the magnet 320. The second coil 430 may be a fine pattern coil (FP coil) integrally formed on the substrate portion 435.

The first substrate 420 may include a second coil 430. That is, the second coil 430 may be a component of the first substrate 420. However, the second coil 430 may be disposed on a substrate portion 435 separate from the first substrate 420.

The second coil 430 may include a plurality of coils. The second coil 430 may include a number of coils corresponding to the magnet 320. The second coil 430 may include three coils. The second coil 430 may include four coils. The second coil 430 may include a 2-1 coil 430-1, a 2-2 coil 430-2, and a 2-3 coil 430-3. The 2-1 coil 430-1 may face the first magnet 320-1. The 2-2 coil 430-2 may face the second magnet 320-2. The 2-3rd coil 430-3 may face the third magnet 320-3.

The number of windings of the 2-1 coil 430-1 may be greater than the number of windings of the 2-2 coil 430-2 and the 2-3rd coil 430-3. The number of windings of the 2-2 coil 430-2 may correspond to the number of windings of the 2-3rd coil 430-3. In this embodiment, when the OIS is driven, the X-axis direction movement is performed through the 2-1 coil 430-1, and the Y-axis direction movement is performed by the 2-2 coil 430-2 and the 2-3 coil 430. It can be done through -3). Accordingly, in the present embodiment, the number of turns of the 2-1 coil 430-1 is the 2-2 coil 430-2 and the 2-3 coil ( It can be higher than the number of turns in 430-3). For example, the ratio of the number of turns of the 2-1 coil 430-1 to the number of turns of the 2-2 and 2-3 coils 430-2 and 430-3 is 1.5: 2.0 to 1: 1 day I can. Ideally, the ratio of the number of turns of the 2-1 coil 430-1 to the number of turns of the 2-2 and 2-3 coils 430-2 and 430-3 is 1: 1, but due to space constraints. 1.5: can be deployed up to 2.0.

The second coil 430 may include a substrate portion 435. The substrate portion 435 may be disposed on the base 410. The substrate portion 435 may be disposed on the first substrate 420. The substrate portion 435 may be disposed between the magnet 320 and the base 410. Here, although the substrate portion 435 is described as a configuration separate from the first substrate 420, the substrate portion 435 may be understood as a configuration included in the first substrate 420.

The substrate portion 435 may be a circuit board. The substrate portion 435 may be an FPCB. The second coil 430 may be integrally formed on the substrate 435 as a fine pattern coil (FP coil). A first hole penetrating the substrate portion 435 in the optical axis direction may be formed in the center of the substrate portion 435. A second hole through which the second elastic member 600 passes may be formed in the substrate portion 435.

The stator 400 may include a first sensor 440. The first sensor 440 may be disposed on the base 410. The first sensor 440 may detect the fourth magnet 230. The first sensor 440 may be disposed on the first substrate 420. The first sensor 440 may be coupled to the lower surface of the first substrate 420. The first sensor 440 may be disposed in the hole 411 of the base 410. The first sensor 440 may be spaced apart from the housing 310. The first sensor 440 may be spaced apart from the bobbin 210. The first sensor 440 may overlap the fourth magnet 230 in the optical axis direction. The first sensor 440 may detect the position of the fourth magnet 230 for AF feedback control. The first sensor 440 may be a Hall IC, a Hall element, or a Hall sensor. The first sensor 440 may sense the magnetic force of the fourth magnet 230.

The stator 400 may include a second sensor 450. The second sensor 450 may be disposed between the base 410 and the first substrate 420. The second sensor 450 may detect the movement of the second mover 300. The second sensor 450 may sense the magnetic force of the magnet 320 to detect movement of the housing 310 and the magnet 320. The detection value sensed by the second sensor 450 may be used for OIS feedback control. The second sensor 450 may include a plurality of Hall sensors. The second sensor 450 may include two Hall sensors. The second sensor 450 may include a first Hall sensor sensing movement in the x-axis direction in the horizontal direction and a second Hall sensor sensing movement in the y-axis direction in the horizontal direction.

The stator 400 may include a terminal 460. The terminal 460 may be disposed on the lower surface of the base 410. The terminal 460 may be electrically connected to the first substrate 420. The length of the wire of the second elastic member 600 may be secured through the terminal 460.

The lens driving device 10 may include a first elastic member 500. The first elastic member 500 may connect the housing 310 and the bobbin 210. The first elastic member 500 may be coupled to the bobbin 210 and the housing 310. The first elastic member 500 may elastically connect the bobbin 210 and the housing 310. The first elastic member 500 may have elasticity at least in part. The first elastic member 500 may elastically support the movement of the bobbin 210 when driving the AF.

The first elastic member 500 may include an upper elastic member. The first elastic member 500 may connect the upper portion of the housing 310 and the upper portion of the bobbin 210. The first elastic member 500 may be coupled to an upper surface of the bobbin 210 and an upper surface of the housing 310. The first elastic member 500 may be formed of a leaf spring. The first elastic member 500 may include a lower elastic member.

The first elastic member 500 may electrically connect the first coil 220 and the first substrate 420. The first elastic member 500 may include a plurality of upper elastic units. The first elastic member 500 may include three upper elastic units. The first elastic member 500 may include a first upper elastic unit 501, a second upper elastic unit 502, and a third upper elastic unit 503. The first upper elastic unit 501 may connect one of the plurality of wires to the 1-1th coil 220-1. The second upper elastic unit 502 may connect the 1-1 coil 220-1 and the 1-2 coil 220-2. The third upper elastic unit 503 may connect the 1-2 coil 220-2 to the other wire among the plurality of wires.

The first elastic member 500 may include an inner portion 510. The inner portion 510 may be coupled to the upper portion of the bobbin 210. The inner part 510 may include a hole inserted into the first protrusion of the bobbin 210.

The first elastic member 500 may include an outer portion 520. The outer portion 520 may be coupled to the upper portion of the housing 310. The outer portion 520 may include a hole inserted into the first protrusion of the housing 310.

The first elastic member 500 may include a connection part 530. The connection part 530 may connect the inner part 510 and the outer part 520. The connection part 530 may have elasticity.

The first elastic member 500 may include a coupling portion 540. The coupling portion 540 extends from the outer portion 520 and may be coupled to the second elastic member 600. The coupling part 540 may include a hole through which the wire of the second elastic member 600 passes. A solder ball connecting the coupling portion 540 and the wire may be disposed on the upper surface of the coupling portion 540.

The lens driving device 10 may include a second elastic member 600. The second elastic member 600 may be an'OIS support member'. The second elastic member 600 may connect the first elastic member 500 to the first substrate 420, the substrate portion 435, or the terminal 460. The second elastic member 600 may be coupled to the upper surface of the first elastic member 500 and the terminal 460. The second elastic member 600 may support the housing 310 to be movable. The second elastic member 600 may elastically support the housing 310. The second elastic member 600 may have elasticity at least in part. The second elastic member 600 may elastically support the movement of the housing 310 and the bobbin 210 when the OIS is driven. The second elastic member 600 may connect the first substrate 420 and the first elastic member 500. One end of the second elastic member 600 may be coupled to the first elastic member 500 by solder. The other end of the second elastic member 600 may be coupled to the terminal 460 by solder.

The second elastic member 600 may include a plurality of wires. The second elastic member 600 may include four wires. The plurality of wires may include four wires connecting the three upper elastic units 501, 502, 503 and the first substrate 420. As a variant, the second elastic member 600 may be formed of a leaf spring.

The lens driving device 10 may include a damper. The damper may be disposed on the second elastic member 600. The damper may be disposed on the second elastic member 600 and the housing 310. The damper may be disposed on the elastic member. The damper may be disposed on the elastic member and/or the second elastic member 600 to prevent a resonance phenomenon occurring in the elastic member and/or the second elastic member 600.

Hereinafter, a camera module according to the present embodiment will be described with reference to the drawings.

15 is an exploded perspective view of the camera device according to the present embodiment.

The camera device 10A may include a camera module.

The camera device 10A may include a lens module 20. The lens module 20 may include at least one lens. The lens may be disposed at a position corresponding to the image sensor 60. The lens module 20 may include a lens and a barrel. The lens module 20 may be coupled to the bobbin 210 of the lens driving device 10. The lens module 20 may be coupled to the bobbin 210 by screwing and/or an adhesive. The lens module 20 may move integrally with the bobbin 210.

The camera device 10A may include a filter 30. The filter 30 may serve to block light of a specific frequency band from entering the image sensor 60 from the light passing through the lens module 20. The filter 30 may be disposed parallel to the x-y plane. The filter 30 may be disposed between the lens module 20 and the image sensor 60. The filter 30 may be disposed on the sensor base 40. As a variant, the filter 30 may be disposed on the base 410. The filter 30 may include an infrared filter. The infrared filter may block the incident of light in the infrared region to the image sensor 60.

The camera device 10A may include a sensor base 40. The sensor base 40 may be disposed between the lens driving device 10 and the printed circuit board 50. The sensor base 40 may include a protrusion 41 on which the filter 30 is disposed. An opening may be formed in a portion of the sensor base 40 on which the filter 30 is disposed so that the light passing through the filter 30 can enter the image sensor 60. The adhesive member 45 may couple or adhere the base 410 of the lens driving device 10 to the sensor base 40. The adhesive member 45 may additionally serve to prevent foreign substances from flowing into the lens driving device 10. The adhesive member 45 may include any one or more of an epoxy, a thermosetting adhesive, and an ultraviolet curable adhesive.

The camera device 10A may include a printed circuit board 50 (PCB, Printed Circuit Board). The printed circuit board 50 may be a substrate or a circuit board. A lens driving device 10 may be disposed on the printed circuit board 50. A sensor base 40 may be disposed between the printed circuit board 50 and the lens driving device 10. The printed circuit board 50 may be electrically connected to the lens driving device 10. An image sensor 60 may be disposed on the printed circuit board 50. The printed circuit board 50 may be provided with various circuits, elements, control units, etc. in order to convert an image formed by the image sensor 60 into an electrical signal and transmit it to an external device.

The camera device 10A may include an image sensor 60. The image sensor 60 may have a configuration in which light passing through the lens and filter 30 is incident to form an image. The image sensor 60 may be mounted on the printed circuit board 50. The image sensor 60 may be electrically connected to the printed circuit board 50. For example, the image sensor 60 may be coupled to the printed circuit board 50 by a surface mounting technology (SMT). As another example, the image sensor 60 may be coupled to the printed circuit board 50 by flip chip technology. The image sensor 60 may be disposed so that the lens and the optical axis coincide. That is, the optical axis of the image sensor 60 and the optical axis of the lens may be aligned. The image sensor 60 may convert light irradiated to the effective image area of the image sensor 60 into an electrical signal. The image sensor 60 may be any one of a charge coupled device (CCD), a metal oxide semi-conductor (MOS), a CPD, and a CID.

The camera device 10A may include a motion sensor 70. The motion sensor 70 may be mounted on the printed circuit board 50. The motion sensor 70 may be electrically connected to the controller 80 through a circuit pattern provided on the printed circuit board 50. The motion sensor 70 may output rotational angular velocity information due to the movement of the camera device 10A. The motion sensor 70 may include a 2-axis or 3-axis gyro sensor, or an angular velocity sensor.

The camera device 10A may include a control unit 80. The control unit 80 may be disposed on the printed circuit board 50. The controller 80 may be electrically connected to the first and second coils 220 and 430 of the lens driving device 10. The controller 80 may individually control the direction, intensity, and amplitude of the current supplied to the first and second coils 220 and 430. The controller 80 may control the lens driving device 10 to perform an auto focus function and/or a camera shake correction function. Furthermore, the controller 80 may perform auto focus feedback control and/or camera shake correction feedback control for the lens driving device 10.

The camera device 10A may include a connector 90. The connector 90 may be electrically connected to the printed circuit board 50. The connector 90 may include a port for electrically connecting to an external device.

In the camera module according to the present embodiment, when a driving current in the first direction is applied to the first coil 220, the bobbin 210 moves in the first stroke in a direction away from the image sensor, and the first coil 220 When a driving current in a second direction opposite to the first direction is applied to the bobbin 210, the bobbin 210 may move within the second stroke in a direction closer to the image sensor. In this case, the first stroke may be longer than the second stroke.

Hereinafter, an optical device according to the present embodiment will be described with reference to the drawings.

16 is a perspective view showing an optical device according to the present embodiment, and FIG. 17 is a configuration diagram of the optical device according to the present embodiment.

Optical devices 10B include mobile phones, mobile phones, smart phones, portable smart devices, digital cameras, laptop computers, digital broadcasting terminals, personal digital assistants (PDAs), portable multimedia players (PMPs), and navigation. It can be any one of. However, the type of the optical device 10B is not limited thereto, and any device for photographing an image or photograph may be included in the optical device 10B.

The optical device 10B may include a body 850. The body 850 may have a bar shape. Alternatively, the main body 850 may have various structures such as a slide type, a folder type, a swing type, and a swivel type in which two or more sub-bodies are relatively movably coupled. The body 850 may include a case (casing, housing, and cover) forming an exterior. For example, the main body 850 may include a front case 851 and a rear case 852. Various electronic components of the optical device 10B may be embedded in a space formed between the front case 851 and the rear case 852. A display module 753 may be disposed on one surface of the main body 850. The camera 721 may be disposed on one or more of the surfaces of the body 850 and the other surface disposed on the opposite side of the body 850.

The optical device 10B may include a wireless communication unit 710. The wireless communication unit 710 may include one or more modules that enable wireless communication between the optical device 10B and the wireless communication system or between the optical device 10B and a network in which the optical device 10B is located. For example, the wireless communication unit 710 includes one or more of a broadcast reception module 711, a mobile communication module 712, a wireless Internet module 713, a short-range communication module 714, and a location information module 715. can do.

The optical device 10B may include an A/V input unit 720. The A/V (Audio/Video) input unit 720 is for inputting an audio signal or a video signal, and may include at least one of a camera 721 and a microphone 722. In this case, the camera 721 may include the camera device 10A according to the present embodiment.

The optical device 10B may include a sensing unit 740. The sensing unit 740 includes an optical device 10B such as an open/closed state of the optical device 10B, a position of the optical device 10B, whether a user is in contact, an orientation of the optical device 10B, and acceleration/deceleration of the optical device 10B. ) May be detected to generate a sensing signal for controlling the operation of the optical device 10B. For example, when the optical device 10B is in the form of a slide phone, whether or not the slide phone is opened or closed may be sensed. In addition, a sensing function related to whether the power supply unit 790 supplies power and whether the interface unit 770 is coupled to an external device may be performed.

The optical device 10B may include an input/output unit 750. The input/output unit 750 may be a component for generating input or output related to visual, auditory, or tactile sense. The input/output unit 750 may generate input data for controlling the operation of the optical device 10B, and may also output information processed by the optical device 10B.

The input/output unit 750 may include one or more of a keypad unit 751, a touch screen panel 752, a display module 753, and an audio output module 754. The keypad unit 751 may generate input data by inputting a keypad. The touch screen panel 752 may convert a change in capacitance generated due to a user's touch to a specific area of the touch screen into an electrical input signal. The display module 753 may output an image captured by the camera 721. The display module 753 may include a plurality of pixels whose color changes according to an electrical signal. For example, the display module 753 includes a liquid crystal display, a thin film transistor-liquid crystal display, an organic light-emitting diode, a flexible display, and a three-dimensional display. It may include at least one of 3D displays. The sound output module 754 outputs audio data received from the wireless communication unit 710 in a call signal reception, a call mode, a recording mode, a voice recognition mode, or a broadcast reception mode, or stored in the memory unit 760. Audio data can be output.

The optical device 10B may include a memory unit 760. A program for processing and controlling the controller 780 may be stored in the memory unit 760. In addition, the memory unit 760 may store one or more of input/output data, for example, a phone book, a message, an audio, a still image, a photo, and a video. The memory unit 760 may store an image captured by the camera 721, for example, a photo or a video.

The optical device 10B may include an interface unit 770. The interface unit 770 serves as a path for connecting to external devices connected to the optical device 10B. The interface unit 770 may receive data from an external device, receive power and transmit it to each component inside the optical device 10B, or transmit data inside the optical device 10B to an external device. The interface unit 770 includes a wired/wireless headset port, an external charger port, a wired/wireless data port, a memory card port, a port for connecting a device equipped with an identification module, and an audio input/output (I/O). It may include any one or more of a port, a video input/output (I/O) port, and an earphone port.

The optical device 10B may include a control unit 780. The controller 780 may control the overall operation of the optical device 10B. The controller 780 may perform related control and processing for voice calls, data communication, and video calls. The controller 780 may include a display controller 781 that controls the display module 753, which is a display of the optical device 10B. The controller 780 may include a camera controller 782 that controls the camera device 10A. The controller 780 may include a multimedia module 783 for playing multimedia. The multimedia module 783 may be provided in the controller 180 or may be provided separately from the controller 780. The controller 780 may perform a pattern recognition process capable of recognizing a handwriting input or a drawing input performed on the touch screen as characters and images, respectively.

The optical device 10B may include a power supply unit 790. The power supply unit 790 may receive external power or internal power under the control of the controller 780 to supply power required for operation of each component.

Although the embodiments of the present invention have been described with reference to the accompanying drawings, those of ordinary skill in the art to which the present invention pertains can be implemented in other specific forms without changing the technical spirit or essential features. You will be able to understand. Therefore, it should be understood that the embodiments described above are illustrative in all respects and are not limiting.

Claims (17)

Base;
A housing spaced apart from the base;
A bobbin disposed in the housing;
A magnet disposed in the housing;
A first coil disposed on the bobbin and facing the magnet; And
And a second coil disposed on the base and facing the magnet,
The magnet includes an inner surface facing the first coil,
The inner surface of the magnet includes a first region having a first polarity, a second region spaced apart from the first region and disposed below the first region and having a second polarity opposite to the first polarity, and the Including a third region disposed between the first region and the second region,
An area of the first area of the magnet is different from an area of the second area of the magnet. The method of claim 1,
The bobbin includes a protrusion protruding from a side surface of the bobbin,
The first coil includes a first portion disposed above the protruding portion of the bobbin, a second portion disposed below the protruding portion of the bobbin, and a third portion connecting the first portion and the second portion. Including,
The first area on the inner surface of the magnet faces the first part of the first coil at an initial position where no current is applied to the first coil, and the second area is the second area of the first coil. Lens drive device facing the part. The method of claim 1,
An area of the first area of the magnet is smaller than an area of the second area of the magnet. The method of claim 2,
In the initial position, the distance in the optical axis direction between the upper end of the first portion of the first coil and the lower end of the first region of the first region of the magnet is the upper end of the first portion of the first coil And 80% or more of the distance in the optical axis direction between the lower end of the first portion of the first coil. The method of claim 2,
At the initial position, the first portion of the first coil overlaps the first and third regions of the magnet in a direction perpendicular to an optical axis. The method of claim 2,
In the initial position, the second portion of the first coil overlaps the second region of the magnet in a direction perpendicular to an optical axis. The method of claim 2,
In the initial position, the third portion of the first coil overlaps the second and third regions of the magnet in a direction perpendicular to an optical axis. The method of claim 1,
The magnet includes a first magnet, and second and third magnets disposed opposite to each other,
The first coil includes a 1-1 coil facing the second magnet, and a 1-2 coil facing the third magnet,
The second coil drives a lens including a 2-1 coil facing the first magnet, a 2-2 coil facing the second magnet, and a 2-3 coil facing the third magnet Device. The method of claim 8,
Lens driving apparatus comprising a dummy member disposed on the housing opposite to the third magnet. The method of claim 8,
The first magnet is a two-pole magnetized magnet, and the second and third magnets are four-pole magnetized magnets. The method of claim 1,
A fourth magnet disposed on the bobbin;
A substrate disposed on the base; And
And a sensor disposed on the substrate and sensing the fourth magnet,
The second coil is a lens driving device disposed on the substrate. The method of claim 1,
The length in the long side direction of the inner surface of the magnet is longer than the length in the corresponding direction of the first coil, and the length in the short side direction of the inner surface of the magnet is less than the length in the corresponding direction of the first coil Long lens drive. The method of claim 1,
A lens driving device in which a length of the magnet in a long-side direction of the inner surface corresponds to a length in a corresponding direction of the second coil. Printed circuit board;
An image sensor disposed on the printed circuit board;
The lens driving device of claim 1 disposed on the printed circuit board; And
A camera module including a lens coupled to the bobbin of the lens driving device. The method of claim 14,
When a driving current in a first direction is applied to the first coil, the bobbin moves in a first stroke in a direction away from the image sensor, and drives the first coil in a second direction opposite to the first direction. When current is applied, the bobbin moves within the second stroke in a direction closer to the image sensor,
The first stroke is longer than the second stroke. housing;
A bobbin disposed in the housing;
A magnet disposed in the housing;
A first coil disposed on the bobbin and facing the magnet; And
And a second coil disposed under the magnet and facing the magnet,
The bobbin includes a protrusion protruding from a side surface of the bobbin,
The first coil includes a first portion disposed above the protruding portion of the bobbin, a second portion disposed below the protruding portion of the bobbin, and a third portion connecting the first portion and the second portion. Including,
The magnet includes a first magnet part including an N pole and an S pole, a second magnet part disposed below the first magnet part and including an N and S pole, and the first magnet part and the second magnet. Including a neutral portion disposed between the portions,
The first portion of the first coil overlaps the first magnet portion and the neutral portion in a direction perpendicular to an optical axis at an initial position where no current is applied to the first coil. housing;
A bobbin disposed in the housing;
A magnet disposed in the housing;
A first coil disposed on the bobbin and facing the magnet; And
And a second coil disposed under the magnet and facing the magnet,
The magnet includes a first magnet part including an N pole and an S pole, a second magnet part spaced apart from the first magnet part and disposed below the first magnet part and including an N pole and an S pole, and the first magnet part. And a neutral portion disposed between the first magnet portion and the second magnet portion,
A lens driving device having a length in the optical axis direction of the first magnet portion shorter than a length in the optical axis direction of the second magnet portion.

Images