KR20160112489A - Lens driving device, camera module and optical apparatus - Google Patents

Abstract

The present invention relates to a lens driving device comprising: a base which has a support part protruding upwards; and a driving unit separated from the support part and located on a top of the base to be moved. A damper is spread between the support part and the driving unit. As such, the present invention prevents the support part from oscillating by improving a gain value of the support part in resonant frequencies, and improves a performance of an optical image stabilization (OIS) function.

Description

[0001] LENS DRIVING DEVICE, CAMERA MODULE, AND OPTICAL APPARATUS [0002]

An embodiment of the present invention relates to a lens driving device, a camera module, and an optical device.

As the spread of various portable terminals is widely popularized and the wireless Internet service is commercialized, the demands of consumers related to portable terminals are diversified, and various kinds of additional devices are installed in portable terminals.

Among them, a camera module is typically used for photographing a subject as a photograph or moving image, storing the image data, and editing and transmitting the image data as required.

Meanwhile, in recent years, a camera module having an optical image stabilization (OIS) function has been used, and feedback control needs to be used for more precise control.

However, when the feedback control is applied to the conventional camera module, when an external force corresponding to the resonance frequency of the elastic member of the lens driving device is applied, the elastic member oscillates, which may cause a problem.

An object of the present invention is to provide a lens driving apparatus in which a gain value at a resonance frequency of a support member is improved in order to solve the above problems. Furthermore, it is intended to provide a lens driving apparatus in which the performance of the camera-shake correction function (OIS) is improved.

Also, a camera module and an optical apparatus including the lens driving apparatus are provided.

According to an aspect of the present invention, there is provided a lens driving apparatus including: a base including a support portion protruded upward; And a drive unit spaced apart from the support unit and movably positioned above the base, and a damper may be applied between the support unit and the drive unit.

The driving unit may further include a step portion located on an outer circumferential surface of the driving unit and having a shape corresponding to the supporting portion, and the damper may be applied between the supporting portion and the step portion.

Wherein the step portion includes a protruding portion protruding outward from an outer circumferential surface of the drive unit and a depressed portion located at a lower portion of the protruding portion, the side surface of the support portion being opposed to the depressed portion and the upper surface of the support portion being opposed to the protruding portion .

The driving unit includes: a first mover including a first movable portion coupled to a lens portion; And a second mover positioned on the outer side of the first movable portion and including a second movable portion opposed to the first movable portion, wherein the first mover has an electromagnetic relationship between the first movable portion and the second movable portion It is possible to flow to the second mover.

The drive unit includes a support member elastically coupled with the first mover and the second mover, and the damper can improve the gain value of the resonance frequency of the support member.

Wherein the drive unit includes a second movable part located on the upper side of the base and including a second movable part, and a third movable part located between the second movable part and the base and opposed to the second movable part, And the second mover may be movable relative to the stator by electromagnetic interaction between the second movable portion and the third movable portion.

The support portion overlaps at least a part with the step portion in a vertical direction, and the height of the support portion is set such that when the second mover moves in the horizontal direction with respect to the stator to perform an optical image stabilization (OIS) So that the amount of tilt can be minimized.

Wherein the second movable part includes a magnet, and the second mover further includes a housing fixed to the inner upper part in such a manner that the magnet is adhered to an inner upper part of the housing, wherein the stepped part is located on the outer side of the housing at a position corresponding to the magnet .

The support portion may overlap at least a part of the step portion in the vertical direction, and the end portion of the support portion may be positioned at the same or higher than the center of gravity of the magnet.

The supporting portion overlaps at least a part of the step portion in the vertical direction and the height of the supporting portion is formed so that the magnet does not fall off even when the supporting portion tilts the step portion when the second mover is moved or tilted in the horizontal direction .

A sensor unit for sensing the second mover; And a control unit for performing shake compensation function feedback of the second mover using a sensing value sensed by the sensor unit.

And a side support member coupled to the base and the drive unit to elastically support the drive unit with respect to the base, wherein the damper can improve the gain value of the resonance frequency of the side support member.

A camera module according to an embodiment of the present invention includes a printed circuit board on which an image sensor is mounted; A base disposed on the printed circuit board and including a hollow hole formed at a position corresponding to the image sensor; A support formed on the base and protruding upward from the outside of the hollow hole; A housing spaced apart from the support and movably positioned above the base; A supporting member elastically coupled to the base and the housing; And a step portion located on an outer circumferential surface of the housing and having a shape corresponding to the support portion. A damper for improving a gain value of the resonant frequency of the support member may be applied between the support portion and the step portion.

An optical apparatus according to an embodiment of the present invention includes a main body, a display unit disposed on one side of the main body to display information, and a camera module mounted on the main body to photograph an image or a photograph, A printed circuit board; A base disposed on the printed circuit board and including a support protruding upward; A drive unit spaced apart from the support unit and movably positioned above the base; A step portion formed on an outer circumferential surface of the drive unit and having a shape corresponding to the support portion; And a damper applied between the supporting portion and the step portion.

Through the present invention, the gain value at the resonance frequency of the support member can be improved to prevent oscillation of the support member. In addition, the performance of the camera shake correction function (OIS) can be improved.

1 is a perspective view of a lens driving apparatus according to an embodiment of the present invention.
2 is an exploded perspective view of a lens driving apparatus according to an embodiment of the present invention.
3 is a cross-sectional view illustrating some components of a lens driving apparatus according to an embodiment of the present invention, as viewed from X-X 'of FIG.
4 is a cross-sectional view illustrating the operation of some components of the lens driving apparatus according to one embodiment of the present invention.
5 is a cross-sectional view illustrating some components of a lens driving apparatus according to an embodiment of the present invention.
6 to 7 are graphs of frequency characteristics for explaining the effects of the lens driving apparatus according to an embodiment of the present invention.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference numerals whenever possible, even if they are shown in different drawings. In the following description of the embodiments of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the difference that the embodiments of the present invention are not conclusive.

In describing the components of the embodiment of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected or connected to the other component, Quot; may be "connected," "coupled," or "connected. &Quot;

As used herein, the term "PCB" refers to a printed circuit board as an abbreviation of a printed circuit board. In the following description, "FPCB" refers to a flexible printed circuit board as an abbreviation of a flexible printed circuit board.

Hereinafter, the configuration of an optical apparatus according to an embodiment of the present invention will be described in detail.

The optical apparatus according to an exemplary embodiment of the present invention may be applied to a mobile phone, a mobile phone, a smart phone, a portable smart device, a digital camera, a laptop computer, a digital broadcasting terminal, a PDA (Personal Digital Assistants) Portable Multimedia Player), navigation, and the like, but is not limited thereto, and any device for capturing images or photographs is possible.

An optical apparatus according to an embodiment of the present invention includes a main body (not shown), a display unit (not shown) disposed on one side of the main body to display information, And a camera having a module.

Hereinafter, the configuration of the camera module will be described.

The camera module may further include a lens driving device 10, a printed circuit board (not shown), and an image sensor (not shown).

The lens driving device 10 can be coupled to the upper side of the printed circuit board. On the other hand, a separate holder member can be positioned between the lens driving device 10 and the printed circuit board. Further, the image sensor can be mounted on the top of the printed circuit board. That is, the printed circuit board may form the bottom surface of the camera module.

In addition, the camera module may further include an infrared cut filter (not shown). The infrared cutoff filter can block the light of the infrared region from entering the image sensor. The infrared cut filter may be installed in the base 500, which will be described later, or may be combined with a holder member (not shown). The infrared filter may be mounted in a hollow hole 510 formed at the center of the base 500. The infrared filter may be formed of a film material or a glass material as one embodiment. On the other hand, the infrared filter may be in the form of an infrared ray blocking coating material disposed on a plate-shaped optical filter such as a cover glass for protecting an image pickup surface or a cover glass.

The camera module may further include a lens module coupled to the lens driving device 10. [ With this structure, light passing through the lens module mounted on the lens driving apparatus 10 can be irradiated to the image sensor. The lens module may include one or more lenses (not shown) and a lens barrel for accommodating the one or more lenses. However, one configuration of the lens module is not limited to the lens barrel, and any structure can be used as long as it can support one or more lenses.

Hereinafter, the configuration of the lens driving apparatus 10 will be described in detail with reference to the drawings.

FIG. 1 is a perspective view of a lens driving apparatus according to an embodiment of the present invention, and FIG. 2 is an exploded perspective view of a lens driving apparatus according to an embodiment of the present invention.

1, a lens driving apparatus 10 according to an embodiment of the present invention includes a cover 100, a first mover 200, a second mover 300, a stator 400, a base 500 A support member 600, a sensor unit 700, and a damper 800. In the lens driving apparatus 10 according to an embodiment of the present invention, the cover 100, the first mover 200, the second mover 300, the stator 400, the base 500, At least one of the sensor unit 600, the sensor unit 700, and the damper 800 may be omitted. The first mover 200 and the second mover 300 of the lens driving apparatus 10 according to an embodiment of the present invention may be collectively referred to as a drive unit 20.

The cover 100 can form an appearance of the lens driving apparatus 10. [ The cover 100 may be in the form of a hexahedron having an open bottom, but is not limited thereto. On the other hand, the cover 100 can be mounted on the upper portion of the base 500. The first mover 200, the second mover 300, the stator 400, and the support member 600 may be positioned in the inner space formed by the cover 100 and the base 500. [ The cover 100 may be mounted on the base 500 in close contact with a part or all of the side surface of the base 500 to be described later. With such a structure, the cover 100 protects the internal components from external impacts and has a function of preventing foreign contaminants from penetrating.

 The cover 100 is made of a metal material, for example, and can serve as a shield can. In this case, the cover 100 can protect the components of the lens driving apparatus 10 from external radio wave interference generated by a cellular phone or the like. However, the material of the cover 100 is not limited thereto.

The cover 100 may include an opening 110 formed on an upper surface thereof and exposing a lens module which is a component of the camera module. That is, the light introduced through the opening 110 can be transmitted to the image sensor through the lens module. Further, although the lens driving apparatus 10 as one embodiment does not include a lens module, the lens driving apparatus 10 as another embodiment may include a lens module.

The first movable element 200 may be located outside the lens module. That is, the lens module may be located inside the first mover 200. In other words, the outer peripheral surface of the lens module can be coupled to the inner peripheral surface of the first movable element 200. Meanwhile, the first mover 200 can flow integrally with the lens module through interaction with the second mover 300 or the stator 400. That is, the first movable element 200 can move the lens module.

The first movable element 200 may include a bobbin 210. The first movable part 200 may include a first movable part 220 coupled with the bobbin 210.

The bobbin 210 may be coupled to a lens module. More specifically, the outer circumferential surface of the lens module may be coupled to the inner circumferential surface of the bobbin 210. The first movable part 220 may be coupled to the bobbin 210. Further, an upper portion of the bobbin 210 may be engaged with the upper support member 610. [ The bobbin 210 may flow relative to the housing 310.

The bobbin 210 may include a first guide portion 211 for guiding the first movable portion 220 to be wound or mounted. The first guide portion 211 may be formed integrally with the outer surface of the bobbin 210. The first guide part 211 may be continuously formed along the outer surface of the bobbin 210 or spaced apart from the bobbin 210 by a predetermined distance.

The bobbin 210 may include a coupling protrusion 213 to be coupled with the upper support member 610. The engaging projections 213 can be inserted into and engaged with the first engaging recesses 617 of the upper support member 610. On the other hand, protrusions are provided on the upper support member 610, and grooves are provided on the bobbin 210 so that both are coupled. As shown in FIG. 2, the bobbin 210 is provided with a total of eight coupling protrusions 213 and may be coupled to each of the upper support members 610 on which the coupling protrusions 213 are separated .

The first movable part 220 may be positioned opposite to the second movable part 320 of the second mover 300. The first movable part 220 can move the bobbin 210 with respect to the housing 310 through electromagnetic interaction with the second movable part 320. The first movable part 220 may include a coil. The coil may be wound on the outer surface of the bobbin 210 by being guided by the first guide portion 211. In addition, the coil may be disposed on the outer surface of the bobbin 210 such that four coils are independently provided and two adjacent coils are 90 ° apart from each other. When the first movable part 220 includes a coil, the power supplied to the coil may be supplied through the upper support member 610. [ On the other hand, when power is supplied to the coil, an electromagnetic field may be formed around the coil. Further, as another embodiment, the first movable part 220 may include a magnet. In this case, the second movable element 320 may include a coil.

The second mover 300 may be located outside the first mover 200 and opposed to the first mover 200.

The second mover 300 may include a housing 310 located outside the bobbin 210. The second mover 300 may include a second movable part 320 positioned opposite to the first movable part 220 and fixed to the housing 310.

The housing 310 may be formed in a shape corresponding to the inner surface of the cover 100 forming the outer appearance of the lens driving apparatus 10. [ In addition, the housing 310 is formed of an insulating material, and may be formed as an injection molded article in consideration of productivity. The housing 310 may be disposed at a distance from the cover 100 as a moving part for OIS (Optical Image Stabilization) driving.

The upper and lower sides of the housing 310 are opened to accommodate the first mover 200 so as to be movable up and down. The housing 310 may include a movable portion accommodating portion 311 formed on the side surface thereof to correspond to the second movable portion 320 and accommodating the second movable portion 320. That is, the movable portion accommodating portion 311 can receive and fix the second movable portion 320. Meanwhile, the movable portion accommodating portion 311 may be located on the inner circumferential surface or the outer circumferential surface of the housing 310.

The housing 310 may include a stopper 312 that protrudes upward and absorbs the impact by contacting the underside of the upper surface of the cover 100 during an external impact. The stopper 312 may be formed in plural. The stopper 312 may be provided at each of the four corners or the corner side as shown in FIG. 2 as an example, but the present invention is not limited thereto. Meanwhile, the stopper 312 may be formed integrally with the housing 310.

An upper support member 610 may be coupled to the upper portion of the housing 310. The housing 310 may include a coupling protrusion 323 coupled with the upper support member 610. The engaging projection 323 can be inserted and engaged with the second engaging groove 618 of the upper support member 610. Meanwhile, protrusions may be provided on the upper support member 610, and grooves may be formed on the housing 310 so that both are coupled. The housing 310 may have a plurality of coupling protrusions 313. As shown in FIG. 2, the housing 310 may be provided with a total of eight engagement protrusions 313. However, the present invention is not limited thereto.

The housing 310 may include a step portion 315 formed on the outer circumferential surface. That is, the step portion 315 can be formed on the outer circumferential surface of the housing 310. As an example, the step portion 315 may be provided with four portions at the corners where the adjacent side surfaces of the housing 310 meet each other. The step portion 315 can be described as being depressed on the lower side compared with the upper side. Further, the step portion 315 can be described as being projected upward from the lower side. That is, the step portion 315 may be formed such that the projected portion and the recessed portion meet each other. A support portion 520 of the base 500 may be positioned below the step portion 315. A damper 800 may be applied between the step portion 315 and the support portion 520. The damper 800 can improve the resonance frequency gain value of the support member 600 as will be described later. Also, the damper 800 can minimize the oscillation of the support member 600 at the resonance frequency, and can minimize the oscillation of the housing 310 at the resonance frequency of the second or higher order.

The second movable portion 320 may be positioned opposite to the first movable portion 220 of the first movable element 200. [ The second movable part 320 can move the first movable part 220 through the electromagnetic interaction with the first movable part 220. The second movable portion 320 may include a magnet. The magnet may be fixed to the movable portion accommodating portion 311 of the housing 310. The magnet may be, for example, four as shown in FIG. The four magnets may be independently provided, and the two adjacent magnets may be disposed on the housing 310 so as to form 90 degrees with respect to each other. That is, the second movable part 320 may be equidistantly mounted on the corner where the adjacent side surfaces of the housing 310 meet each other. That is, the second movable part 320 may be mounted on the inner side of the corner where the adjacent side surfaces of the housing 310 meet each other, and the stepped part 315 may be located on the outer side. The second movable part 320 may be adhered to the housing 310 with an adhesive or the like, but is not limited thereto. Meanwhile, the first movable part 220 may include a magnet, and the second movable part 320 may include a coil.

The stator 400 may be positioned opposite to the lower side of the second mover 300. Meanwhile, the stator 400 can move the second mover 300 in a fixed state. In addition, the through holes 411 and 421 corresponding to the lens module may be located at the center of the stator 400. [

The stator 400 may include a third movable part 410 positioned to face the lower side of the second movable part 320. The stator 400 may include an FPCB (Flexible Printed Circuit Board) 420 positioned between the third movable portion 410 and the base 500.

The third movable portion 410 may include a coil. In this case, when power is applied to the coil of the third movable part 410, the housing 310 in which the second movable part 320 is fixed can flow due to the interaction with the second movable part 320. The third movable portion 410 may be mounted on or electrically connected to the FPCB 420. Meanwhile, the third movable part 410 may have a through hole 411 at the center thereof to pass the optical signal of the lens module. In consideration of the downsizing of the lens driving apparatus 10 (the height in the z axis direction in the optical axis direction), the third movable portion 410 is formed of an FP coil, which is a patterned coil, 420). The third movable part 410 includes a coil disposed at a predetermined distance below the second movable part 320, and the coil may be arranged to correspond to the number of the second movable parts 320. That is, in the case where the number of the second movable parts 320 is four as in the embodiment, four coils may be disposed and the coils may be mounted on the FPCB 420 or may be formed on the FPCB 420 by being formed of FP coils.

The FPCB 420 may be positioned between the third movable portion 410 and the base 500. On the other hand, the FPCB 420 can supply power to the third movable unit 410. The FPCB 420 can supply power to the first movable unit 220 through the side support member 630 and the upper side support member 610. [

The FPCB 420 may have a through hole 421 at a position corresponding to the through hole 411 of the third movable part 410. In addition, the FPCB 420 may include a terminal portion 422 bent and exposed to the outside. The terminal portion 422 may be connected to an external power source, through which power may be supplied to the FPCB 420.

The base 500 can support the stator 400. Further, the base 500 can support the second mover 300. A printed circuit board (not shown) may be positioned below the base 500. The base 500 may include a hollow hole 510 formed at a position corresponding to the through holes 411 and 421 of the stator 400. In this case, the base 500 may perform a sensor holder function for protecting the image sensor (not shown). The base 500 may have a protruding portion extending downward along a side surface thereof. In addition, a separate sensor holder (not shown) may be disposed under the base 500. In this case, a sensor holder is disposed under the base 500, and the sensor holder can be coupled to the printed circuit board. Meanwhile, the base 500 may be provided to position an Infrared Ray Filter (not shown) as described above. That is, the infrared filter may be coupled to the hollow hole 510 of the base 500.

The base 500 may further include a foreign matter collecting unit (not shown) for collecting foreign matter introduced into the cover 100 as an embodiment. The base 500 may further include a sensor seating groove 530 on which the sensor unit 700 is mounted. The base 500 may include two independent sensor seating grooves 530 to seat the first sensor 710 and the second sensor 720, respectively, for example. The sensor seating groove 530 may be formed in a shape corresponding to the first sensor 710 or the second sensor 720 of the sensor unit 700. The plurality of sensor seating grooves 530 can accommodate a plurality of sensors. The sensor seating groove 530 can be positioned to sense both the x and y axis movements of the second mover 300 through the first sensor 710 and the second sensor 720. In one embodiment, the sensor seating groove 530 may be formed at the edge of the base 500. In addition, the two sensor seating grooves 530 can form an angle of 90 degrees with respect to the optical axis.

The terminal 500 may be provided with a terminal member, and the terminal may be integrally formed using a surface electrode or the like as an example.

The support member 600 can connect the first mover 200 and the second mover 300 to each other. The support member 600 is configured to elastically connect the first mover 200 and the second mover 300 so that the first mover 200 can move relative to the second mover 300 can do. That is, the support member 600 may be provided as an elastic member. The support member 600 may include an upper support member 610 and a side support member 630 as shown in FIG. 2 as an example. Further, the support member 600 may further include a lower support member (not shown). The lower support member may be coupled to a lower portion of the bobbin 210 and a lower portion of the housing 310. The lower support member may be a leaf spring.

The upper support member 610 may be connected to the upper portion of the first mover 200 and the upper portion of the second mover 300. More specifically, the upper support member 610 may be coupled to the upper portion of the bobbin 210 and the upper portion of the housing 310. The coupling protrusion 213 of the bobbin 210 is coupled to the first coupling groove 617 of the upper support member 610 and the coupling protrusion 213 of the coupling of the housing 310 is coupled to the second coupling groove 618 of the upper support member 610, The protrusion 313 can be engaged. The upper support member 610 may be, for example, a leaf spring. Meanwhile, the first coupling groove 617 and the second coupling groove 618 may be formed as a single hole. In this case, the coupling protrusion 213 of the bobbin 210 and the coupling protrusion 313 of the housing 310 may be coupled to the hole.

The upper support member 610 includes an inner portion 611 connected to the bobbin 210 as an example, an outer portion 612 connected to the housing 310, and a connection portion 612 connecting the inner portion 611 and the outer portion 612. [ (613). That is, the inner side portion 611 can be engaged with the bobbin 210. The inner side portion 611 is provided with the first engagement groove 617 and the bobbin 210 is provided with the engagement protrusion 213 so that the engagement protrusion 213 is inserted into the first engagement groove 617, . The outer portion 612 can be engaged with the housing 310. A second engaging groove 618 is provided in the outer side portion 612 and an engaging projection 313 is provided in the housing 310 so that the engaging projection 313 is inserted into the second engaging groove 618, . The connecting portion 613 can resiliently connect the inner portion 611 and the outer portion 612. The inner side portion 611, the outer side portion 612, and the connecting portion 613 may be integrally formed, and may be bent at least twice. However, the present invention is not limited thereto.

The upper support members 610 may be separately provided as two, for example. Each of the separated upper supporting members 610 may be connected to the first movable unit 220 to supply power to the first movable unit 220. [ The upper support member 610 may be connected to the side support member 630 to receive power from the side support member 630 and transmit the power to the first movable unit 220.

The upper support member 610 resiliently supports the bobbin 210 and the housing 310 so that the bobbin 210 can move up and down with respect to the housing 310. That is, the autofocus function of the lens driving apparatus 10 can be realized by the elastic support of the upper support member 610 and the electromagnetic interaction of the first movable portion 220 and the second movable portion 320.

One end of the side support member 630 may be fixed to the stator 400 or the base 500 and the other end may be coupled to the second mover 300. Further, one end may be fixed to the stator 400 or the base 500, and the other end may be coupled to the upper support member 610. The side support member 630 elastically supports the second mover 300 so that the second mover 300 can be moved in a horizontal direction or tilted.

Further, the side support member 630 may be combined with the upper support member 610 as an example and further include a structure for shock absorption. The shock absorbing structure may be provided on at least one of the side support member 630 and the upper side support member 610. [ The configuration for shock absorption may include an elastic deformation portion (not shown). The configuration for shock absorption may be realized by changing the shape of any one of the side support member 630 and the upper side support member 610. [ The side support members 630 may be provided in a total of four as one embodiment. However, the present invention is not limited thereto. The side support member 630 may be energized with the upper support member 610 to receive power from the FPCB 420 and transmit the power to the upper support member 610. In other words, the side support members 630 can supply power supplied from the stator 400 to the upper side support members 610, respectively. The number of the side support members 630 can be determined in consideration of symmetry as one embodiment. As shown in FIG. 2, the side support members 630 may be provided at a total of four sides, one for each side of the housing 310.

The side support member 630 may include, for example, a lower portion 631, an upper portion 632, and a connection portion 633. More specifically, the lateral support member 630 may include a lower portion 631 coupled with the stator 400 or the base 500. The side support member 630 may include an upper side portion 632 coupled with the second mover 300 or the upper support member 610. [ The side support member 630 may include a connection portion 633 for elastically connecting the lower portion 631 and the upper portion 632. [ The side support member 630 may be, for example, a leaf spring. Further, the side support member 630 may be a wire as an example. However, the present invention is not limited thereto.

The sensor unit 700 may be used for AF (Auto Focus) feedback and / or Optical Image Stabilization (OIS) feedback. That is, the sensor unit 700 can sense the position and / or the movement of the first mover 200 and / or the second mover 300. The sensor unit 700 may be located in the stator 400. The sensor unit 700 is located on the upper surface or the lower surface of the FPCB 420 of the stator 400 and can receive power from the FPCB 420 and transmit the sensing value. The sensor unit 700 may be located in the sensor seating groove 530 formed in the base 500 as an embodiment. The sensor unit 700 may include a Hall sensor as one embodiment. In this case, the relative movement of the second mover 300 with respect to the stator 400 can be sensed by sensing the magnetic field of the second movable part 320 of the second mover 300. That is, the sensor unit 720 senses the horizontal movement or tilt of the second mover 300 and can provide information for OIS feedback.

The sensor unit 700 may include a first sensor 710 and a second sensor 720 as one embodiment. The first sensor 710 can sense the movement of the second mover 300 in the x-axis direction. Meanwhile, the second sensor 720 can sense the movement of the second mover 300 in the y-axis direction. Also, the first sensor 710 senses the y-axis movement of the second mover 300 and the second sensor 720 senses the movement of the second mover 300 in the x-axis direction. That is, the movement and / or tilt amount of the second mover 300 in the x and y directions can be sensed through the first sensor 710 and the second sensor 720. Furthermore, a third sensor (not shown) may be further provided to sense movement in the z-axis direction through the first sensor 710 and the second sensor 720. The third sensor may be disposed on either the second mover 300 or the first mover 200 to sense the movement of the first mover 200 in the z-axis direction.

Hereinafter, some configurations of the lens driving apparatus 10 will be described in more detail with reference to the drawings.

3 is a cross-sectional view illustrating some components of a lens driving apparatus according to an embodiment of the present invention, as viewed from X-X 'of FIG.

Referring to FIG. 3, the lens driving apparatus 10 according to an embodiment of the present invention may include a driving unit 20, a base 500, and a damper 800. Here, the drive unit 20 may include a first mover 200, a second mover 300, and an upper support member 610 as an example.

The drive unit 20 can be movably positioned on the upper side of the base 500. More specifically, the drive unit 20 can be supported apart from the base 500 via the side support members 630. [ The camera shake correction function (OIS) can be performed on the image sensor positioned at the lower portion of the base 500 as the drive unit 20 is laterally moved or tilted relative to the base 500.

The drive unit 20 may be spaced apart from the support 520. The drive unit 20 may be located inside the support 520 located at four corners, edges or edges of the base 500 having a rectangular cross section as an example. That is, the lateral movement of the drive unit 20 can be limited by the support portion 520. At least a part of the driving unit 20 in the horizontal direction may overlap with the supporting portion 520. Further, at least a part of the driving unit 20 in the vertical direction may overlap with the supporting portion 520.

The description of the first mover 200 and the second mover 300 of the drive unit 20 can be applied to the above description. That is, the driving unit 20 can perform an auto focus (AF) function and / or an image stabilization function as power is supplied.

The drive unit 20 may include a step portion 315 having a shape corresponding to the shape of the support portion 520 on the outer circumferential surface. The step portion 315 may include, for example, a depression 315a which is recessed from the periphery and a protrusion 315b which protrudes from the periphery. That is, the step portion 315 can be formed by the projecting portion 315b located on the upper side and the depressed portion 315a located on the lower side. Meanwhile, the supporting portion 520 may be spaced apart from both the depressed portion 315a and the protruding portion 315b. A damper 800 may be applied to the spacing space between the support 520 and the protrusion 315b. That is, the damper 800 may be positioned between the upper surface of the support 520 and the lower surface of the protrusion 315b. In addition, the spacing space between the support portion 520 and the depression 315a can form a horizontal movement space of the drive unit 20. [ That is, the space for moving the driving unit 20 in the horizontal direction is also restricted by the spacing space between the supporting portion 520 and the depression 315a.

The support portion 520 may protrude upward from the base 500. The support portion 520, in one embodiment, may be formed at a total of four edges or corners. However, the present invention is not limited thereto. The support portion 520 may be formed so as to correspond to the shape of the step portion 315. A damper 800 may be positioned between the support 520 and the stepped portion 315.

The damper 800 may be positioned between the support portion 520 and the step portion 315. The damper 800 is, for example, for absorbing vibration energy and may include a buffer material. The damper 800 may be applied to the support portion 520 and the step portion 315 to change the frequency characteristics of the support member 600. [ The damper 800 can improve the gain value of the secondary resonance frequency of the support member 600 as an example. This will be described below.

Hereinafter, the operation of a part of the configuration of the lens driving apparatus 10 will be described in more detail with reference to the drawings.

4 is a cross-sectional view illustrating the operation of some components of the lens driving apparatus according to one embodiment of the present invention. More specifically, FIG. 4A shows a case where the drive unit 20 moves to the right (A), and FIG. 4B shows a case where the drive unit 20 moves to the left (C) Respectively.

4 (a), when the driving unit 20 is moved to the right in the horizontal direction (A) for OIS control, the support portion 520 of the base 500 and the step portion 315 of the driving unit 20, It can be confirmed that the tilter (B) is generated in the right direction (the direction in which the left side is heard upward) by the damper 800 applied between the two sides. 4 (b), when the driving unit 20 is moved to the left in the horizontal direction (C) for OIS control, the supporting portion 520 of the base 500 and the step portion of the driving unit 20 (D) in the left direction (the direction in which the right side is heard upward) is generated by the damper 800 applied between the upper and lower tie bars 315 and 315. On the other hand, the tilt (B, D) in FIGS. 4 (a) and 4 (b) is a factor that degrades the OIS function, and the amount thereof needs to be minimized.

5 is a cross-sectional view illustrating some components of a lens driving apparatus according to an embodiment of the present invention.

5, a lens driving apparatus 10 according to an embodiment of the present invention includes a driving unit 20, a base 500, and a damper (not shown) applied between the driving unit 20 and the base 500 800). Here, the driving unit 20 may include a bobbin 210 located inside and a housing 310 located outside. That is, the damper 800 may be positioned between the housing 310 and the base 500. Meanwhile, as shown in FIG. 4, it is necessary to minimize the amount of unexpected tilt occurring during the OIS control (movement or tilting in the horizontal direction) of the drive unit 20. Therefore, the lens driving apparatus 10 according to the embodiment of the present invention minimizes the amount of unexpected tilt by adjusting the height of the support portion 520 of the base 500. Meanwhile, the lens driving apparatus 10 according to an embodiment of the present invention can be described as minimizing the amount of unexpected tilt by adjusting the distance between the upper surface of the base 500 and the housing 310.

The height of the support portion 520 (see H1 in FIG. 5) may be set to a minimum value when the second mover 300 moves in the horizontal direction with respect to the stator 400 in order to perform the image stabilization function (OIS) . That is, the height H1 of the support 520 may be lower than the height of the support 520 of FIG. 3 (see FIG. 5A). In this case, as the height H1 of the support portion 520 is lowered, the tilt center (rotation center) of the drive unit 20 is lowered, and the amount of tilt can also be reduced. That is, consideration of the improvement of the OIS function can determine the upper limit of the height of the supporter 520.

The height H1 of the support 520 may be equal to or greater than the height of the second mover 300 when the second mover 300 moves or tilts in the horizontal direction, So that the movable part 320 is not dropped. That is, at least a part of the support part 520 overlaps with the step part 315 in the vertical direction, and the end part of the support part 520 may be positioned at the same or higher than the center of gravity of the second movable part 320 provided by the magnet . If the height of the supporter 520 is low, the supporter 520 will lower the lower end of the housing 310 and there is a risk that the magnets adhered to the inner upper portion of the housing 310 with an adhesive or the like may fall off. In other words, consideration of prevention of magnet dropout can determine the lower limit of the height of the support portion 520.

That is, the height H1 of the supporter 520 is set such that the magnets adhered to the inner upper portion of the housing 310, even when the housing 310 is priced while minimizing the amount of unexpected tilt during the OIS control of the drive unit 20 It can be formed so as not to fall off.

The distance H2 between the upper surface of the base 500 and the housing 310 may be set to a value that minimizes the amount of unexpected tilt during the OIS control of the drive unit 20 when the support 520 charges the housing 310 The magnet bonded to the inner upper portion of the housing 310 may not be detached. The distance H2 between the upper surface of the base 500 and the housing 310 may be defined as the distance H2 between the upper surface of the base 500 and the step portion 315 of the housing 310. [

That is, the lens driving apparatus 10 according to an embodiment of the present invention adjusts the height H1 of the support portion 520 and / or the distance H2 between the upper surface of the base 500 and the housing 310 It is possible to minimize the occurrence of unexpected tilt during OIS control. 5, when the height H1 of the supporter 520 is increased to the height of the damper 800, the distance between the upper surface of the base 500 and the housing 310 H2, the height H1 of the supporting part 520 and the distance H2 between the upper surface of the base 500 and the housing 310 are determined, and the other one can be determined together.

5, the tiltable space of the drive unit 20 may be reduced by reducing the space between the bobbin 210 and the support 520 of the base 500. [

Hereinafter, the operation of the lens driving apparatus according to an example of the present invention will be described in detail with reference to the drawings.

FIG. 2 is an exploded perspective view of a lens driving apparatus according to an embodiment of the present invention, and FIGS. 6 and 7 are graphs of frequency characteristics for explaining effects of a lens driving apparatus according to an embodiment of the present invention. 6 and 7 show the frequency characteristics of the support member 600 according to the input frequency in terms of the gain value G and the phase P and FIG. 6 shows the frequency characteristics of the damper 800 not applied FIG. 7 shows frequency characteristics of the support member 600 at the time of application of the damper 800. FIG.

The lens driving apparatus 10 according to an example of the present invention can be supplied with power from the outside through the terminal 422 of the FPCB 420 of the stator 400. [ On the other hand, the FPCB 420 can supply the supplied power to the third movable part 410 provided as an FP coil. The FPCB 420 can supply power to the first movable part 220 provided as a coil through the side support member 630 and the upper side support member 610. [

When power is supplied to the first movable part 220, the first movable part 200 moves in the vertical direction with respect to the second movable part 300 by electromagnetic interaction with the second movable part 320 provided as a magnet . That is, as the first movable part 220 is supplied with power, the bobbin 210 moves in the direction of the optical axis with respect to the housing 320 to perform an autofocus function.

The first mover 200 or the second mover 300 may be provided with a sensor unit (not shown) for sensing the movement of the first mover 200. The sensor unit may sense a movement of the first mover 200 to provide a sensing value to a controller (not shown) so that autofocus feedback can be performed.

When power is supplied to the third movable part 410, the second movable part 300 moves in the horizontal direction with respect to the stator 400 by electromagnetic interaction with the second movable part 320 provided as a magnet. That is, as the power is supplied to the third movable unit 410, the drive unit 20 moves in the horizontal direction with respect to the base 500 to perform the image stabilization function. However, the present invention is not limited to this, and the second mover 300 may be tilted with respect to the stator 400 for the purpose of correcting the shaking motion.

Meanwhile, the movement of the second mover 300 may be sensed through the sensor unit 700, which is supplied with power through the FPCB 420. As an example, the first sensor 710 senses the movement of the second mover 300 in the x-axis direction, and the second sensor 720 senses the movement of the second mover 300 in the y-axis direction . That is, the sensor unit 700 can sense the movement of the second mover 300 in the horizontal direction. Further, the sensor unit 700 may be provided to detect a tilt amount of the second mover 300.

The movement amount or position of the second mover 300 sensed by the sensor unit 700 may be provided to the control unit. The positional information on the second mover 300 provided in the control section can be used for the shake correction function feedback. That is, the control unit can perform the camera shake correction function feedback using the positional information of the second mover 300 transmitted by the sensor unit 700.

6, when the damper 800 is not applied between the drive unit 20 and the support part 520 of the base 500 when the camera shake correction function feedback is performed, It can be confirmed that oscillation may occur at the primary resonance frequency (E in FIG. 6) and the secondary resonance frequency (F in FIG. 6) of the support member 600. 7, the damper 800 is applied between the supporting portions 520 of the base 500, so that the oscillation of the supporting member 600 Minimizing the phenomenon. 6 and 7, at the primary resonance frequency of the support member 600 shown by E in Fig. 6 and the secondary resonance frequency of the support member 600 shown by F in Fig. 6, It can be confirmed that the rate of change is lower than that of the first embodiment.

Further, the damper 800 between the drive unit 20 and the base 500 may cause degradation of the image stabilization function. This is because an unexpected tilt may be generated in the drive unit 20 by the damper 800 when the drive unit 20 is horizontally controlled. Therefore, the lens driving apparatus according to the embodiment of the present invention minimizes the degradation of the image stabilization function by limiting the height of the support portion 520 of the base 500. [ Here, the height of the support portion 520 (see H in FIG. 5) is set such that, even when the housing 310 is priced while the amount of unexpected tilt is minimized during the OIS control of the drive unit 20, The magnet can be formed so as not to fall off.

Accordingly, the lens driving apparatus 10 according to the embodiment of the present invention can prevent the degradation of the image stabilization function while minimizing the oscillation of the support member that may be generated at the resonance frequency.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments. That is, within the scope of the present invention, all of the components may be selectively coupled to one or more of them. Furthermore, the terms "comprises", "comprising", or "having" described above mean that a component can be implanted unless otherwise specifically stated, But should be construed as including other elements. All terms, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. Commonly used terms, such as predefined terms, should be interpreted to be consistent with the contextual meanings of the related art, and are not to be construed as ideal or overly formal, unless expressly defined to the contrary.

The foregoing description is merely illustrative of the technical idea of the present invention and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

100: cover
200: first mover
300: second mover
400: stator
500: Base
600: support member
700:
800: Damper

Claims (14)

A base including a support portion protruding upward; And
And a drive unit spaced apart from the support unit and positioned movably above the base,
And a damper is applied between the supporting portion and the driving unit.
The method according to claim 1,
Further comprising a step portion located on an outer circumferential surface of the drive unit and having a shape corresponding to the support portion,
Wherein the damper is applied between the supporting portion and the step portion.
The method according to claim 1,
Wherein the step portion includes a protrusion protruding outward from an outer circumferential surface of the drive unit and a depressed portion located under the protrusion,
Wherein a side surface of the support portion is opposed to the depression and an upper surface of the support portion is opposed to the projecting portion.
The method according to claim 1,
The driving unit includes:
A first mover including a first movable portion coupled to a lens portion; And
And a second movable part located on the outer side of the first movable part and including a second movable part facing the first movable part,
Wherein the first mover is capable of flowing to the second mover by electromagnetic interaction between the first movable part and the second mover.
5. The method of claim 4,
The driving unit includes:
And a support member elastically supporting the first mover and the second mover,
Wherein the damper improves the gain value of the resonance frequency of the support member.
3. The method of claim 2,
Wherein the drive unit includes a second mover located on the upper side of the base and including a second movable portion,
And a third movable part located between the second movable part and the base and facing the second movable part,
And the second mover is capable of flowing to the stator by electromagnetic interaction between the second movable portion and the third movable portion.
The method according to claim 6,
Wherein the support portion overlaps with the step portion at least in a vertical direction,
Wherein the height of the support portion is formed such that the tilt amount is minimized when the second mover moves in the horizontal direction with respect to the stator so as to perform an optical image stabilization (OIS) function.
The method according to claim 6,
The second movable portion includes a magnet,
The second mover further comprises a housing fixed in such a manner that the magnet is adhered to the inner upper portion,
And the step portion is located outside the housing at a position corresponding to the magnet.
9. The method of claim 8,
Wherein the support portion overlaps with the step portion at least in a vertical direction,
And an end of the support portion is positioned at the same or higher than the center of gravity of the magnet.
9. The method of claim 8,
Wherein the support portion overlaps with the step portion at least in a vertical direction,
Wherein the height of the support portion is formed so that the magnet does not fall off even if the support portion charges the step portion when the second mover is moved or tilted in the horizontal direction.
The method according to claim 6,
A sensor unit for sensing the second mover; And
And a controller for performing shake compensation function feedback of the second mover via a sensing value sensed by the sensor unit.
The method according to claim 1,
And a side support member coupled to the base and the drive unit to elastically support the drive unit with respect to the base,
Wherein the damper improves the gain value of the resonance frequency of the side support member.
A printed circuit board on which an image sensor is mounted;
A base disposed on the printed circuit board and including a hollow hole formed at a position corresponding to the image sensor;
A support formed on the base and protruding upward from the outside of the hollow hole;
A housing spaced apart from the support and movably positioned above the base;
A supporting member elastically coupled to the base and the housing; And
And a step portion located on an outer circumferential surface of the housing and having a shape corresponding to the support portion,
And a damper for improving a gain value of the resonance frequency of the supporting member is applied between the supporting portion and the step portion.
A display unit disposed on one side of the main body to display information; and a camera module mounted on the main body and configured to photograph an image or a photograph,
The camera module includes:
Printed circuit board;
A base disposed on the printed circuit board and including a support protruding upward;
A drive unit spaced apart from the support unit and movably positioned above the base;
A step portion formed on an outer circumferential surface of the drive unit and having a shape corresponding to the support portion; And
And a damper applied between the supporting portion and the step portion.

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