KR102596541B1 - Lens driving device, camera module and optical apparatus - Google Patents

Abstract

The present invention relates to a lens driving device comprising a base including a support portion protruding upward, and a drive unit spaced apart from the support portion and movably positioned above the base, wherein a damper is applied between the support portion and the drive unit. will be.
Through the present invention, oscillation of the support member can be prevented by improving the gain value at the resonance frequency of the support member, and the performance of the image stabilization function (OIS) can be improved.

Description

Lens driving device, camera module and optical apparatus}

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

As various types of portable terminals become widespread and wireless Internet services become commercialized, consumer demands related to portable terminals are also diversifying, and various types of additional devices are being installed on portable terminals.

Among them, a camera module is a representative example that can take a photo or video of a subject, store the image data, and then edit and transmit it as needed.

Meanwhile, camera modules equipped with optical image stabilization (OIS) are being used recently, and feedback control needs to be used for more precise control.

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

(Patent Document 1) KR 10-2014-0135154 A

In order to solve the above-mentioned problem, it is intended to provide a lens driving device with improved gain at the resonance frequency of the support member. Furthermore, the aim is to provide a lens driving device that improves the performance of the image stabilization function (OIS).

Additionally, it is intended to provide a camera module and optical device including the lens driving device.

In order to solve the above-described problem, a lens driving device according to an embodiment of the present invention includes a base including a support portion protruding toward the image side; and a driving unit spaced apart from the support part and movably positioned above the base, and a damper may be applied between the support part and the driving unit.

It is located on the outer peripheral surface of the driving unit and further includes a step portion having a shape corresponding to the support portion, and the damper may be applied between the support portion and the step portion.

The step portion includes a protrusion that protrudes outward from the outer peripheral surface of the drive unit and a depression located below the protrusion, a side surface of the support portion faces the depression portion and an upper surface of the support portion faces the protrusion. You can.

The driving unit includes a first movable unit to which a lens unit is coupled and which includes a first movable unit; and a second movable unit located outside the first movable unit and including a second movable unit facing the first movable unit, wherein the first movable unit detects electromagnetic interaction between the first movable unit and the second movable unit. By its action, it may be able to move with respect to the second movable member.

The driving unit includes a support member that is coupled to the first movable member and the second movable member to elastically support the first movable member, and the damper may improve a gain value of a resonance frequency of the support member.

The driving unit is located above the base and includes a second movable part, and a stator is located between the second movable part and the base and includes a third movable part facing the second movable part. It further includes, wherein the second movable member may be movable with respect to the stator by electromagnetic interaction between the second movable part and the third movable part.

The support part overlaps the step part in the vertical direction at least in part, and the height of the support part is adjusted when the second movable moves in the horizontal direction with respect to the stator to perform optical image stabilization (OIS). It can be formed so that the amount of tilt is minimized.

The second movable part includes a magnet, and the second movable further includes a housing to which the magnet is fixed by being glued to an inner upper part, and the stepped portion is positioned on the outside of the housing at a position corresponding to the magnet. You can.

The support portion overlaps at least a portion of the stepped portion in a vertical direction, and an end of the support portion may be located equal to or higher than the center of gravity of the magnet.

The support part overlaps the step part in the vertical direction at least in part, and the height of the support part is formed so that the magnet does not fall off even when the support part hits the step part when the second movable moves or tilts in the horizontal direction. It can be.

A sensor unit that senses the second movable device; And it may further include a control unit that performs feedback on the hand shake correction function of the second operator through the sensing value sensed by the sensor unit.

It further includes a lateral support member coupled to the base and the drive unit to elastically support the drive unit with respect to the base, and the damper can improve a gain value of the resonance frequency of the lateral 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 located on an upper part of the printed circuit board and including a hollow hole formed at a position corresponding to the image sensor; a support portion formed on the base and protruding upward outside the hollow hole; a housing spaced apart from the support portion and movably positioned on an upper side of the base; a support member coupled to the base and the housing to elastically support it; and a step portion located on the outer peripheral surface of the housing and having a shape corresponding to the support portion. A damper that improves the gain value of the resonance frequency of the support member may be applied between the support portion and the step portion.

An optical device 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 installed in the main body to capture images or photos, the camera module Silver, printed circuit board; a base located on top of the printed circuit board and including a support portion protruding upward; a driving unit spaced apart from the support unit and movably positioned on an upper side of the base; a stepped portion formed on the outer peripheral surface of the driving unit and having a shape corresponding to the support portion; And it may include a damper applied between the support portion and the step portion.

Through the present invention, it is possible to prevent oscillation of the support member by improving the gain value at the resonance frequency of the support member. Additionally, the performance of the image stabilization function (OIS) can be improved.

1 is a perspective view of a lens driving device according to an embodiment of the present invention.
Figure 2 is an exploded perspective view of a lens driving device according to an embodiment of the present invention.
FIG. 3 is a cross-sectional view showing some components of a lens driving device according to an embodiment of the present invention viewed along line XX' of FIG. 2.
Figure 4 is a cross-sectional view showing the operation of some components of a lens driving device according to an embodiment of the present invention.
Figure 5 is a cross-sectional view showing some components of a lens driving device according to an embodiment of the present invention.
6 to 7 are frequency characteristic graphs for explaining the effect of the lens driving device according to an embodiment of the present invention.

Hereinafter, some embodiments of the present invention will be described in detail through illustrative drawings. When adding reference numerals to components in each drawing, it should be noted that identical components are given the same reference numerals as much as possible even if they are shown in different drawings. Additionally, when describing embodiments of the present invention, if detailed descriptions of related known configurations or functions are judged to impede understanding of the embodiments of the present invention, the detailed descriptions will be omitted.

Additionally, when describing the components of an embodiment of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are only used to distinguish the component from other components, and the nature, sequence, or order of the component is not limited by the term. When a component is described as being "connected," "coupled," or "connected" to another component, that component may be directly connected or connected to that other component, but there is no need for another component between each component. It should be understood that may be “connected,” “combined,” or “connected.”

“PCB” used below is an abbreviation for Printed Circuit Board and refers to a printed circuit board. In addition, “FPCB” used below is an abbreviation for Flexible Printed Circuit Board and refers to a flexible printed circuit board.

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

Optical devices according to an embodiment of the present invention include mobile phones, mobile phones, smart phones, portable smart devices, digital cameras, laptop computers, digital broadcasting terminals, PDAs (Personal Digital Assistants), and PMPs (Personal Digital Assistants). Portable Multimedia Player), navigation, etc., but is not limited thereto, and any device for taking videos or photos can be used.

An optical device 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 installed in the main body to capture images or photos. It may include a camera having a module.

Below, 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 may be coupled to the upper side of the printed circuit board. Meanwhile, a separate holder member may be located between the lens driving device 10 and the printed circuit board. Additionally, the image sensor may be mounted on the top of the printed circuit board. That is, the printed circuit board can form the bottom surface of the camera module.

Additionally, the camera module may further include an infrared blocking filter (not shown). An infrared cut-off filter can block light in the infrared region from entering the image sensor. The infrared cut-off filter may be installed on 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 the hollow hole 510 formed in the center of the base 500. In one embodiment, the infrared filter may be made of a film material or a glass material. Meanwhile, the infrared filter may be in the form of an infrared blocking coating material, etc. placed on a flat optical filter such as a cover glass for protecting the imaging surface.

Additionally, the camera module may further include a lens module coupled to the lens driving device 10. Through this structure, light passing through the lens module mounted on the lens driving device 10 can be irradiated to the image sensor. The lens module may include one or more lenses (not shown) and a lens barrel that accommodates the one or more lenses. However, the configuration of the lens module is not limited to the lens barrel, and any holder structure that can support one or more lenses is possible.

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

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

Referring to FIG. 1, the lens driving device 10 according to an embodiment of the present invention includes a cover 100, a first movable member 200, a second movable member 300, a stator 400, and a base 500. ), a support member 600, a sensor unit 700, and a damper 800. However, the lens driving device 10 according to an embodiment of the present invention includes a cover 100, a first movable member 200, a second movable member 300, a stator 400, a base 500, and a support member. One or more of 600, sensor unit 700, and damper 800 may be omitted. Meanwhile, the first movable unit 200 and the second movable unit 300 of the lens driving device 10 according to an embodiment of the present invention may be collectively referred to as the driving unit 20.

The cover 100 may form the exterior of the lens driving device 10. As an example, the cover 100 may have a hexahedral shape with an open bottom, but is not limited thereto. Meanwhile, the cover 100 may be mounted on the top of the base 500. The first movable member 200, the second movable member 300, the stator 400, and the support member 600 may be located in the internal space formed by the cover 100 and the base 500. Additionally, the cover 100 may be mounted on the base 500 with its inner surface in close contact with some or all of the side surfaces of the base 500, which will be described later. Through this structure, the cover 100 protects internal components from external impact and has the function of preventing penetration of external contaminants.

The cover 100, as an example, is made of a metal material and can function as a shield can. In this case, the cover 100 can protect the components of the lens driving device 10 from external radio interference caused by a mobile phone, etc. However, the material of the cover 100 is not limited to this.

The cover 100 may include an opening 110 formed on the upper surface to expose the lens module, which is a component of the camera module. That is, light introduced through the opening 110 may be transmitted to the image sensor through the lens module. Additionally, the lens driving device 10 as one embodiment does not include a lens module, but the lens driving device 10 as another embodiment may include a lens module.

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

The first movable member 200 may include a bobbin 210. Additionally, the first movable member 200 may include a first movable part 220 coupled to the bobbin 210.

Bobbin 210 may be combined with a lens module. In more detail, the outer peripheral surface of the lens module may be coupled to the inner peripheral surface of the bobbin 210. Meanwhile, the first movable part 220 may be coupled to the bobbin 210. Additionally, the upper part of the bobbin 210 may be coupled to the upper support member 610. The bobbin 210 may move relative to the housing 310 .

The bobbin 210 may include a first guide part 211 that guides the first movable part 220 as it is wound or mounted. The first guide portion 211 may be formed integrally with the outer surface of the bobbin 210. Additionally, the first guide portion 211 may be formed continuously along the outer surface of the bobbin 210 or may be formed spaced apart at predetermined intervals.

The bobbin 210 may include a coupling protrusion 213 coupled to the upper support member 610. The coupling protrusion 213 may be inserted into and coupled to the first coupling groove 617 of the upper support member 610. Meanwhile, the upper support member 610 may be provided with a protrusion and the bobbin 210 may be provided with a groove so that the two may be combined. In one embodiment, the bobbin 210 is provided with a total of eight coupling protrusions 213 as shown in FIG. 2, and each of the coupling protrusions 213 can be coupled to each of the upper support members 610 that are provided separately. .

The first movable part 220 may be positioned opposite to the second movable part 320 of the second movable member 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 guided by the first guide part 211 and wound on the outer surface of the bobbin 210. In addition, as an example, the coil may be arranged on the outer surface of the bobbin 210 so that four coils are independently provided and two adjacent coils form an angle of 90° to each other. When the first movable part 220 includes a coil, power supplied to the coil may be supplied through the upper support member 610. Meanwhile, when power is supplied to the coil, an electromagnetic field may be formed around the coil. Additionally, 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 movable member 300 may be located on the outside of the first movable member 200, facing the first movable member 200.

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

The housing 310 may be formed in a shape corresponding to the inner surface of the cover 100 that forms the exterior of the lens driving device 10. Additionally, the housing 310 is made of an insulating material and may be made of an injection molded product considering productivity. The housing 310 is a movable part for OIS (Optical Image Stabilization) operation and may be placed at a certain distance from the cover 100.

The upper and lower sides of the housing 310 are open so that the first movable member 200 can be moved up and down. Additionally, the housing 310 may include a movable part accommodating part 311 formed on a side surface in a shape corresponding to the second movable part 320 and accommodating the second movable part 320. That is, the movable part accommodating part 311 can accommodate and fix the second movable part 320. Meanwhile, the movable part accommodating part 311 may be located on the inner peripheral surface or the outer peripheral surface of the housing 310.

The housing 310 may include a stopper 312 that protrudes upward and absorbs shock by contacting the lower side of the upper surface of the cover 100 when an external shock occurs. The stoppers 312 may be formed in plural numbers. As an example, the stopper 312 may be provided at each of the four corners or edges as shown in FIG. 2, but 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 part of the housing 310. The housing 310 may include a coupling protrusion 323 coupled to the upper support member 610. The coupling protrusion 323 may be inserted into and coupled to the second coupling groove 618 of the upper support member 610. Meanwhile, the upper support member 610 may be provided with a protrusion and the housing 310 may be provided with a groove so that the two may be combined. The housing 310 may be provided with a plurality of coupling protrusions 313. As an example, the housing 310 may be provided with a total of eight engaging protrusions 313 as shown in FIG. 2 . However, it is not limited to this.

The housing 310 may include a stepped portion 315 formed on the outer peripheral surface. That is, the stepped portion 315 may be formed on the outer peripheral surface of the housing 310. As an example, a total of four step portions 315 may be provided at corners where adjacent sides of the housing 310 meet each other. The stepped portion 315 can be described as having a depressed lower side compared to the upper side. Additionally, the stepped portion 315 may be described as having an upper side that protrudes compared to the lower side. That is, the stepped portion 315 may be formed so that a protruding portion and a recessed portion meet to form a stepped portion. The support portion 520 of the base 500 may be located on the lower side of the stepped portion 315. A damper 800 may be applied between the step portion 315 and the support portion 520. The damper 800, as will be described later, can improve the resonance frequency gain value of the support member 600. Additionally, the damper 800 can minimize the phenomenon in which the support member 600 oscillates at a resonance frequency and minimizes the phenomenon in which the housing 310 oscillates at a second or higher resonance frequency.

The second movable part 320 may be positioned opposite to the first movable part 220 of the first movable member 200. The second movable part 320 can move the first movable part 220 through electromagnetic interaction with the first movable part 220 . The second movable part 320 may include a magnet. The magnet may be fixed to the movable part receiving portion 311 of the housing 310. As an example, four magnets may be provided as shown in FIG. 2. The four magnets are provided independently and can be arranged in the housing 310 so that two adjacent magnets are angled at 90° with each other. That is, the second movable portion 320 may be mounted at equal intervals at corners where adjacent sides of the housing 310 meet each other. That is, the second movable part 320 may be mounted on the inside of a corner where adjacent sides of the housing 310 meet each other, and the step part 315 may be located on the outside. Additionally, the second movable part 320 may be attached to the housing 310 using 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 be provided as a coil.

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

The stator 400 may include a third movable part 410 positioned opposite to the lower side of the second movable part 320. Additionally, the stator 400 may include a flexible printed circuit board (FPCB) 420 located between the third movable part 410 and the base 500. Meanwhile, although the base 500 and the stator 400 are described as separate components, the stator 400 may include the base 500. Like the third movable part 410 and the FPCB 420, the base 500 is a part that is fixed when the first movable member 200 and the second movable member 300 move, so it may be included in the stator 400.

The third movable part 410 may include a coil. In this case, when power is applied to the coil of the third movable part 410, the housing 310 to which the second movable part 320 is fixed may move due to interaction with the second movable part 320. The third movable part 410 may be mounted on or electrically connected to the FPCB 420. Meanwhile, the third movable part 410 may have a through hole 411 in the center to pass the optical signal of the lens module. In addition, considering the miniaturization of the lens driving device 10 (lowering the height in the z-axis direction, which is the optical axis direction), the third moving part 410 is formed of an FP coil, which is a patterned coil, and forms an FPCB (FPCB). 420). Additionally, the third movable part 410 includes a coil disposed at a certain distance apart from the lower part of the second movable part 320, and the coils may be arranged to correspond to the number of second movable parts 320. That is, when the number of second movable parts 320 is four, as in one embodiment, four coils are arranged, and the coils may be mounted on the FPCB 420 or formed as FP coils and placed on the FPCB 420.

The FPCB 420 may be located between the third movable part 410 and the base 500. Meanwhile, the FPCB 420 can supply power to the third movable unit 410. Additionally, the FPCB 420 can supply power to the first movable unit 220 through the lateral support member 630 and the upper support member 610.

The FPCB 420 may be provided with a through hole 421 at a position corresponding to the through hole 411 of the third movable part 410. Additionally, the FPCB 420 may include a terminal portion 422 that is bent and exposed to the outside. The terminal unit 422 can be connected to an external power source, and power can be supplied to the FPCB (420) through this.

The base 500 may support the stator 400. Additionally, the base 500 may support the second movable member 300. A printed circuit board (not shown) may be located in the lower part of 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 to protect the image sensor (not shown). The base 500 may have a protrusion formed in a downward direction along the side surface. Additionally, a separate sensor holder (not shown) may be placed at the lower part of the base 500. In this case, a sensor holder is placed at the lower part of the base 500, and the sensor holder can be combined with a printed circuit board. Meanwhile, the base 500 may be provided to position an infrared ray filter (not shown), as mentioned above. That is, an infrared filter may be coupled to the hollow hole 510 of the base 500.

As an example, the base 500 may further include a foreign matter collection unit (not shown) that collects foreign matter flowing into the cover 100. Meanwhile, the base 500 may further include a sensor seating groove 530 in which the sensor unit 700 is seated. As an example, the base 500 may include two independent sensor seating grooves 530 so that each of the first sensor 710 and the second sensor 720 is seated. The sensor seating groove 530 may be provided in a shape corresponding to the first sensor 710 or the second sensor 720 of the sensor unit 700. The sensor seating groove 530 is provided in plurality and can each accommodate a plurality of sensors. The sensor seating groove 530 may be positioned to sense both the x-axis and y-axis movements of the second movable person 300 through the first sensor 710 and the second sensor 720. As an example, a sensor seating groove 530 may be formed at a corner of the base 500. Additionally, the two sensor mounting grooves 530 may form an angle of 90 degrees to each other around the optical axis.

A terminal member may be installed on the base 500, and as an example, the terminal may be formed integrally using a surface electrode.

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

The upper support member 610 may be connected to the upper part of the first movable member 200 and the upper part of the second movable member 300. In more detail, the upper support member 610 may be coupled to the upper part of the bobbin 210 and the upper part 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 housing 310 is coupled to the second coupling groove 618 of the upper support member 610. Protrusions 313 may be coupled. The upper support member 610 may be a leaf spring, as an example. Meanwhile, the first coupling groove 617 and the second coupling groove 618 may be provided alone. 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.

In one embodiment, the upper support member 610 includes an inner part 611 connected to the bobbin 210, an outer part 612 connected to the housing 310, and a connection part connecting the inner part 611 and the outer part 612. It may include (613). That is, the inner portion 611 may be combined with the bobbin 210. A first coupling groove 617 is provided on the inner part 611, and a coupling protrusion 213 is provided on the bobbin 210, and the two are coupled in such a way that the coupling protrusion 213 is inserted into the first coupling groove 617. It can be. The outer portion 612 may be combined with the housing 310. A second coupling groove 618 is provided on the outer part 612, and a coupling protrusion 313 is provided on the housing 310, so that the two are coupled in such a way that the coupling protrusion 313 is inserted into the second coupling groove 618. It can be. The connecting portion 613 can elastically connect the inner portion 611 and the outer portion 612. Meanwhile, the inner portion 611, the outer portion 612, and the connecting portion 613 may be formed as one body, and may be formed by bending at least twice. However, it is not limited to this.

As an example, the upper support member 610 may be provided separately into two pieces. Each of the separately provided upper support members 610 can be connected to the first movable part 220 to supply power to the first movable part 220. The upper support member 610 is connected to the lateral support member 630 and can receive power from the lateral support member 630 and transmit it to the first movable part 220.

Since the upper support member 610 elastically supports the bobbin 210 and the housing 310, the bobbin 210 can move up and down with respect to the housing 310. That is, the autofocus function of the lens driving device 10 can be realized by the elastic support of the upper support member 610 and the electromagnetic interaction of the first movable part 220 and the second movable part 320.

The lateral support member 630 may have one end fixed to the stator 400 or the base 500 and the other end coupled to the second movable member 300. Additionally, 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 lateral support member 630 elastically supports the second movable member 300 so that the second movable member 300 can move or tilt in the horizontal direction.

In addition, the lateral support member 630, as an example, is coupled to the upper support member 610 and may further include a structure for shock absorption. The structure for absorbing the shock may be provided in one or more of the lateral support member 630 and the upper support member 610. The component for absorbing shock may include an elastic deformation portion (not shown). In addition, the configuration for absorbing shock may be realized by changing the shape of one of the lateral support member 630 and the upper support member 610. In one embodiment, a total of four lateral support members 630 may be provided. However, it is not limited to this. The lateral support member 630 is connected to the upper support member 610 and can receive power from the FPCB 420 and transmit it to the upper support member 610. In other words, the side support member 630 can supply power supplied from the stator 400 to each of the upper support members 610. As an example, the number of lateral support members 630 may be determined by considering symmetry. In one embodiment, a total of four lateral support members 630 may be provided, one on each side of the housing 310, as shown in FIG. 2.

The lateral support member 630 may include, as an example, a lower part 631, an upper part 632, and a connection part 633. In more detail, the lateral support member 630 may include a lower portion 631 coupled to the stator 400 or the base 500. The lateral support member 630 may include an upper portion 632 that is coupled to the second movable member 300 or the upper support member 610. The lateral support member 630 may include a connection portion 633 that elastically connects the lower portion 631 and the upper portion 632. The lateral support member 630 may be a leaf spring, as an example. Additionally, the lateral support member 630 may be a wire, as an example. However, it is not limited to this.

The sensor unit 700 may be used for auto focus (AF) feedback and/or optical image stabilization (OIS) feedback. That is, the sensor unit 700 can detect the position and/or movement of the first movable member 200 and/or the second movable member 300. The sensor unit 700 may be located on the stator 400. The sensor unit 700 is located on the upper or lower surface of the FPCB 420 of the stator 400 and can receive power from the FPCB 420 and transmit sensing values. As an example, the sensor unit 700 may be located in the sensor seating groove 530 formed in the base 500. The sensor unit 700 may include a Hall sensor as an example. In this case, the relative movement of the second movable element 300 with respect to the stator 400 can be sensed by sensing the magnetic field of the second movable part 320 of the second movable element 300. That is, the sensor unit 720 can detect the horizontal movement or tilt of the second movable person 300 and provide information for OIS feedback.

The sensor unit 700 may include a first sensor 710 and a second sensor 720 as an example. The first sensor 710 can sense the movement of the second movable person 300 in the x-axis direction. Meanwhile, the second sensor 720 can sense the movement of the second movable person 300 in the y-axis direction. Additionally, the first sensor 710 may sense the movement of the second movable person 300 in the y-axis direction, and the second sensor 720 may sense the movement of the second movable person 300 in the x-axis direction. That is, the movement and/or tilt amount in the x- and y-axis directions of the second movable person 300 can be sensed through the first sensor 710 and the second sensor 720. Furthermore, a third sensor (not shown) may be further included 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 movable member 300 or the first movable member 200 to sense the z-axis movement of the first movable member 200.

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

FIG. 3 is a cross-sectional view showing some components of a lens driving device according to an embodiment of the present invention viewed along line XX' of FIG. 2.

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

The driving unit 20 may be movably positioned on the upper side of the base 500. In more detail, the driving unit 20 may be supported at a distance from the base 500 through the lateral support member 630. As the driving unit 20 moves or tilts laterally with respect to the base 500, an image stabilization function (OIS) may be performed on the image sensor located below the base 500.

The driving unit 20 may be positioned spaced apart from the support portion 520. As an example, the drive unit 20 may be located inside the support portion 520 located at four corners, corners, or edges of the base 500 having a square cross-section. That is, the drive unit 20 may have its lateral flow restricted by the support portion 520. At least a portion of the driving unit 20 may overlap the support portion 520 in the horizontal direction. Additionally, at least a portion of the driving unit 20 may overlap the support portion 520 in the vertical direction.

The previous description may be applied by analogy to the description of the first movable member 200 and the second movable member 300 of the driving unit 20. That is, the driving unit 20 can perform an auto focus function (AF) and/or an image stabilization correction function as power is applied.

The driving unit 20 may include a stepped portion 315 on the outer peripheral surface having a shape corresponding to the shape of the support portion 520. The stepped portion 315 may include, as an example, a recessed portion 315a that is more recessed than the surrounding portion and a protruding portion 315b that is provided that protrudes more than the surrounding portion. That is, the stepped portion 315 may be formed by a protrusion 315b located on the upper side and a recessed portion 315a located on the lower side. Meanwhile, the support portion 520 may be positioned spaced apart from both the recessed portion 315a and the protruding portion 315b. A damper 800 may be applied to the space between the support portion 520 and the protrusion 315b. That is, the damper 800 may be positioned between the upper surface of the support part 520 and the lower surface of the protrusion 315b. Additionally, the space between the support part 520 and the recessed part 315a may form a space for the drive unit 20 to move in the horizontal direction. That is, the horizontal movement space of the drive unit 20 is also restricted by the separation space between the support portion 520 and the recessed portion 315a.

The support portion 520 may be formed to protrude upward from the base 500 . In one embodiment, a total of four support portions 520 may be formed at edges or corners. However, it is not limited to this. The support portion 520 may be formed to correspond to the shape of the step portion 315. A damper 800 may be located between the support portion 520 and the step portion 315.

The damper 800 may be located between the support portion 520 and the step portion 315. As an example, the damper 800 may include a cushioning material to absorb vibration energy. 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. As an example, the damper 800 can improve the gain value of the secondary resonance frequency of the support member 600. This will be explained below.

Hereinafter, the operation of some components of the lens driving device 10 will be described in more detail with reference to the drawings.

Figure 4 is a cross-sectional view showing the operation of some components of a lens driving device according to an embodiment of the present invention. In more detail, Figure 4 (a) shows a case in which the driving unit 20 moves to the right (A), and Figure 4 (b) shows a case in which the driving unit 20 moves to the left (C). It shows.

Referring to (a) of FIG. 4, when the drive unit 20 is moved horizontally to the right for OIS control (A), the support portion 520 of the base 500 and the step portion 315 of the drive unit 20 It can be seen that the tilt (B) in the right direction (the direction in which the left side is lifted upward) occurs due to the damper 800 applied in between. Meanwhile, referring to (b) of FIG. 4, when the drive unit 20 is moved horizontally to the left for OIS control (C), the support portion 520 of the base 500 and the step portion of the drive unit 20 ( 315), it can be seen that a tilt (D) in the left direction (the direction in which the right side is lifted upward) occurs due to the damper 800 applied between the two sides. Meanwhile, the tilt (B, D) in Figures 4 (a) and (b) is a factor that degrades the OIS function, and its amount needs to be minimized.

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

Referring to FIG. 5, the lens driving device 10 according to an embodiment of the present invention includes a driving unit 20, a base 500, and a damper applied between the driving unit 20 and the base 500. 800). Here, the drive unit 20 may include a bobbin 210 located on the inside and a housing 310 located on the outside. That is, the damper 800 may be located between the housing 310 and the base 500. Meanwhile, as previously observed in FIG. 4, the amount of unexpected tilt that occurs during OIS control (movement or tilt in the horizontal direction) of the drive unit 20 needs to be minimized. Accordingly, the lens driving device 10 according to an embodiment of the present invention adjusts the height of the support portion 520 of the base 500 to minimize the amount of unexpected tilt. Meanwhile, the lens driving device 10 according to an embodiment of the present invention may 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 unit 520 (see H1 in FIG. 5) is such that, as an example, the amount of tilt is minimized when the second movable member 300 moves in a horizontal direction with respect to the stator 400 to perform an image stabilization function (OIS). It can be formed as much as possible. That is, the height H1 of the support part 520 may be lowered compared to the height of the support part 520 in FIG. 3 (see A in FIG. 5). In this case, as the height H1 of the support portion 520 decreases, the tilt center (center of rotation) of the driving unit 20 also decreases, thereby reducing the amount of tilt. That is, consideration of improving the OIS function may determine the upper limit of the height of the support portion 520.

Meanwhile, the height H1 of the support portion 520 is such that even when the second movable member 300 moves or tilts in the horizontal direction and the support portion 520 strikes the step portion 315, the second movable member 300 provided as a magnet The movable part 320 may be formed so as not to fall off. That is, the support portion 520 overlaps at least a portion of the step portion 315 in the vertical direction, and the end of the support portion 520 may be positioned equal to or higher than the center of gravity of the second movable portion 320 provided as a magnet. . If the height of the support part 520 is low, the support part 520 hits the bottom of the housing 310, and there is a risk that the magnet attached to the upper inner part of the housing 310 with adhesive or the like may fall off. That is, consideration of preventing the magnet from falling off may determine the lower limit of the height of the support portion 520.

That is, the height H1 of the support portion 520 is such that even when the unexpected tilt amount is minimized during OIS control of the drive unit 20 and the housing 310 is hit, the magnet bonded to the inner upper part of the housing 310 is It can be formed so that it does not fall off.

In addition, the distance H2 between the upper surface of the base 500 and the housing 310 is also adjusted to minimize the amount of unexpected tilt during OIS control of the drive unit 20 when the support portion 520 hits the housing 310. The magnet attached to the inner upper part of the housing 310 may be formed so as not to fall off. Here, the distance H2 between the upper surface of the base 500 and the housing 310 may be limited to the distance H2 between the upper surface of the base 500 and the stepped portion 315 of the housing 310.

That is, the lens driving device 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. Unexpected tilt can be minimized during OIS control. Meanwhile, in one embodiment of the present invention, as shown in FIG. 5, when the height of the damper 800 is added to the height H1 of the support portion 520, the distance between the upper surface of the base 500 and the housing 310 is ( H2), so when one of the height H1 of the support part 520 and the distance H2 between the upper surface of the base 500 and the housing 310 is determined, the other can also be determined.

Meanwhile, as shown in B of FIG. 5 , the tiltable space of the drive unit 20 may be reduced by reducing the separation space between the bobbin 210 and the support portion 520 of the base 500.

As shown in FIG. 3, the support portion 520 of the base 500 includes a first region in contact with the damper 800, and the first region of the support portion 520 of the base 500 includes the housing 310. It can be placed lower than the center of . As shown in FIG. 3, the protrusion 315b of the housing 310 includes a second area in contact with the damper 800, and the second area of the protrusion 315b of the housing 310 is in contact with the housing 310. It can be placed lower than the center of . As shown in FIG. 3 , the housing 310 may include an additional recessed portion that is recessed from the upper surface of the housing 310 . As shown in FIG. 5, the damper 800 may overlap the bobbin 210 in a direction perpendicular to the optical axis direction. As shown in FIG. 5, the support portion 520 of the base 500 may include a portion that overlaps the bobbin 210 in a direction perpendicular to the optical axis direction.

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

Figure 2 is an exploded perspective view of a lens driving device according to an embodiment of the present invention, and Figures 6 and 7 are frequency characteristic graphs for explaining the effect of the lens driving device according to an embodiment of the present invention. In more detail, both Figures 6 and 7 show the frequency characteristics of the support member 600 according to the input frequency (Frequency) in terms of gain value (G) and phase (P), and Figure 6 shows the damper 800 not applied. The frequency characteristics of the support member 600 when applied are shown, and FIG. 7 shows the frequency characteristics of the support member 600 when the damper 800 is applied.

The lens driving device 10 according to an example of the present invention can receive power from the outside through the terminal 422 of the FPCB 420 of the stator 400. Meanwhile, the FPCB 420 can supply the received power to the third movable unit 410 provided with an FP coil. Additionally, the FPCB 420 can supply power to the first movable part 220 provided as a coil through the lateral support member 630 and the upper 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. I do it. That is, as power is supplied to the first movable part 220, the bobbin 210 moves in the optical axis direction with respect to the housing 320 and can perform an autofocus function.

Meanwhile, the first movable member 200 or the second movable member 300 may be equipped with a sensor unit (not shown) that senses the movement of the first movable member 200. The sensor unit may sense the movement of the first movable person 200 and provide the sensing value to the control unit (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 due to electromagnetic interaction with the second movable part 320 provided as a magnet. That is, as power is supplied to the third movable unit 410, the driving unit 20 moves in the horizontal direction with respect to the base 500 and can perform an image stabilization function. However, it is not limited to this, and the second movable member 300 may be tilted with respect to the stator 400 for the hand shake correction function.

Meanwhile, the movement of the second movable person 300 can be sensed through the sensor unit 700 that receives power through the FPCB 420. As an example, the first sensor 710 senses the movement of the second movable person 300 in the x-axis direction, and the second sensor 720 senses the movement of the second movable person 300 in the y-axis direction. You can. That is, the sensor unit 700 can sense the horizontal movement of the second movable person 300. Furthermore, the sensor unit 700 may be provided to sense the tilt amount of the second movable member 300.

The movement amount or position of the second movable person 300 detected by the sensor unit 700 may be provided to the control unit. The location information about the second movable person 300 provided to the control unit may be used for hand shake correction function feedback. That is, the control unit may perform hand shake correction function feedback using the position information about the second movable person 300 transmitted by the sensor unit 700.

Meanwhile, referring to FIG. 6, when performing the hand shake correction function feedback, if the damper 800 is not applied between the drive unit 20 and the support part 520 of the base 500, the support member 600 It can be confirmed that oscillation can occur at the first resonance frequency (E in FIG. 6) and the second resonance frequency (F in FIG. 6) of the support member 600. Therefore, the lens driving device 10 according to an embodiment of the present invention applies a damper 800 between the support parts 520 of the base 500 to prevent the support member 600 from oscillating as shown in FIG. 7. This phenomenon is minimized. Comparing Figures 6 and 7, at the primary resonance frequency of the support member 600 shown as E in Figure 6 and the secondary resonance frequency of the support member 600 shown as F in Figure 6, Figure 7 is similar to Figure 6. It can be seen that the rate of change has become lower.

Additionally, the damper 800 between the driving unit 20 and the base 500 may cause deterioration of the hand shake correction function. This is because unexpected tilt of the drive unit 20 may occur due to the damper 800 when controlling the horizontal direction of the drive unit 20. Accordingly, the lens driving device according to an embodiment of the present invention minimizes deterioration of the camera shake correction 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 adhered to the inner upper part even when the housing 310 is struck while minimizing the unexpected tilt amount during OIS control of the drive unit 20, as observed previously. The magnet can be formed so that it does not fall off.

Through this, the lens driving device 10 according to an embodiment of the present invention can prevent deterioration of the camera shake correction function while minimizing the oscillation phenomenon of the support member that may occur at the resonance frequency.

In the above, just because all the components constituting the embodiment of the present invention have been described as being combined or operated in combination, the present invention is not necessarily limited to this embodiment. That is, as long as it is within the scope of the purpose of the present invention, all of the components may be operated by selectively combining one or more of them. In addition, terms such as “include,” “comprise,” or “have” described above mean that the corresponding component may be present, unless specifically stated to the contrary, and thus do not exclude other components. Rather, it should be interpreted as being able to include other components. All terms, including technical or scientific terms, unless otherwise defined, have the same meaning as generally understood by a person of ordinary skill in the technical field to which the present invention pertains. Commonly used terms, such as terms defined in a dictionary, should be interpreted as consistent with the contextual meaning of the related technology, and should not be interpreted in an idealized or overly formal sense unless explicitly defined in the present invention.

The above description is merely an illustrative explanation of the technical idea of the present invention, and various modifications and variations will be possible to those skilled in the art without departing from the essential characteristics of the present invention. Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but rather to explain it, 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 interpreted in accordance with the claims below, and all technical ideas within the equivalent scope should be construed as being included in the scope of rights of the present invention.

100: cover
200: First mover
300: Second mover
400: stator
500: Base
600: Support member
700: Sensor unit
800: Damper

Claims (17)

Base;
a housing disposed on the base;
a bobbin disposed within the housing;
a first coil disposed on the bobbin;
A magnet disposed in the housing;
an elastic member connected to the bobbin and the housing;
a second coil disposed on the base; and
Includes a damper disposed on the base
The magnet overlaps the second coil in the optical axis direction and overlaps the first coil in a first direction perpendicular to the optical axis direction,
The damper is disposed between the housing and the base,
The base includes an upper surface facing the housing and a support portion protruding from the upper surface,
The damper is in contact with a first area of the support portion of the base and a second area of the housing,
The first area of the support portion of the base is disposed lower than the center of the housing,
A lens driving device wherein the second area of the housing is disposed lower than the center of the housing. Base;
a cover disposed on the base;
a bobbin disposed within the cover;
a magnet disposed between the bobbin and the cover;
A first coil facing the magnet;
a second coil disposed on the base;
a housing disposed between the cover and the bobbin; and
Includes a damper disposed between the housing and the base,
The housing includes a depression formed in a corner area,
The base includes a support portion protruding at a position corresponding to the depression of the housing,
The damper is in contact with a first area of the support portion of the base and a second area of the housing,
The first area of the support portion of the base is disposed lower than the center of the housing,
A lens driving device wherein the second area of the housing is disposed lower than the center of the housing. Base;
a cover coupled to the base;
a housing disposed within the cover;
a bobbin disposed within the housing;
a magnet disposed between the bobbin and the cover;
a first coil disposed to face the magnet;
a second coil disposed on the base; and
Includes a damper disposed on the base,
The base includes an upper surface facing the housing and a support portion protruding from the upper surface,
The damper is in contact with a first area of the support portion of the base and a second area of the housing,
The first area of the support portion of the base is disposed lower than the center of the housing,
A lens driving device wherein the second area of the housing is disposed lower than the center of the housing. According to paragraph 2 or 3,
A lens driving device including an upper elastic member connected to an upper side of the bobbin and an upper side of the housing. According to any one of claims 1 to 3,
Includes a circuit board disposed on the base,
A lens driving device in which the corners of the base do not overlap the circuit board in the optical axis direction. According to any one of claims 1 to 3,
The housing includes a protrusion protruding from an outer surface of the housing,
A lens driving device wherein the protrusion of the housing includes the second area in contact with the damper. According to paragraph 2,
A lens driving device wherein the damper overlaps the depression of the housing in the optical axis direction. According to paragraph 3,
A lens driving device wherein the first coil is coupled to the bobbin, and the magnet is coupled to at least one of the housing and the cover. According to paragraph 4,
Including a support member,
A lens driving device wherein the support member is coupled to the upper elastic member and the base. According to any one of claims 1 to 3,
Includes a circuit board disposed on the base,
A lens driving device wherein the circuit board is disposed between the housing and the base. According to clause 10,
The second coil is a lens driving device coupled to the circuit board. According to clause 5,
A lens driving device wherein the circuit board includes a chamfer shape in a corner area. According to any one of claims 1 to 3,
A lens driving device wherein the dampers are disposed at each of four corner areas of the base. According to paragraph 2 or 3,
Includes a circuit board disposed on the base,
The circuit board includes a third area disposed on one side of the base, and a plurality of terminals formed in the third area. According to clause 14,
The third area of the circuit board is exposed to the outside of one side wall of the cover. printed circuit board;
an image sensor disposed on the printed circuit board;
The lens driving device of any one of claims 1 to 3 disposed on the printed circuit board; and
A camera module including a lens coupled to the bobbin of the lens driving device. main body;
The camera module of claim 16 disposed in the main body; and
An optical device including a display disposed on the main body and outputting images captured by the camera module.