KR102396356B1 - 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 part protruding upward, and a driving unit spaced apart from the support part and movably located on the upper side of the base, wherein a damper is applied between the support part and the driving unit. will be.
Through the present invention, it is possible to prevent the oscillation of the support member by improving the gain value at the resonant frequency of the support member, and to improve the performance of the hand shake correction function (OIS).

Description

Lens driving device, camera module and optical apparatus

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

As various types of portable terminals are widely distributed and wireless Internet services are commercialized, the demands of consumers related to portable terminals are also diversifying, so that various types of additional devices are being installed in the portable terminals.

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

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, a phenomenon in which the elastic member oscillates may occur, which may cause a problem.

In order to solve the above problem, an object of the present invention is to provide a lens driving device in which a gain value at a resonant frequency of a support member is improved. Furthermore, an object of the present invention is to provide a lens driving device with improved performance of an image stabilization function (OIS).

Another object of the present invention is to provide a camera module and an optical device including the lens driving device.

In order to solve the above problems, a lens driving device according to an embodiment of the present invention includes: a base including a support portion protruding upwardly; and a driving unit spaced apart from the support and movably positioned above the base, wherein a damper may be applied between the support and the driving unit.

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

The step portion may include a protrusion protruding outward from the outer circumferential surface of the driving unit and a depression positioned below the protrusion, wherein a side surface of the support part faces the depression part and an upper surface of the support part faces the protrusion part. can

The driving unit may include: a first movable member to which a lens unit is coupled and including a first movable unit; and a second movable member positioned outside the first movable part and including a second movable part opposite to the first movable part, wherein the first movable part includes an electromagnetic interaction between the first movable part and the second movable part. It may be movable relative to the second mover by action.

The driving unit may include a support member coupled to the first mover and the second mover to elastically support the support member, and the damper may improve a gain value of the resonant frequency of the support member.

The driving unit may include a second movable member positioned above the base and including a second movable part, and a stator positioned between the second movable part and the base and including a third movable part opposite to the second movable part. It further includes, wherein the second movable part may be movable with respect to the stator by electromagnetic interaction of the second movable part and the third movable part.

At least a portion of the support portion overlaps the stepped portion in a vertical direction, and the height of the support portion is determined when the second mover moves in a horizontal direction with respect to the stator in order to perform an optical image stabilization (OIS) function. It may be formed so that the amount of tilt is minimized.

The second movable part includes a magnet, and the second movable part further includes a housing fixed in such a way that the magnet is attached to the inner upper part, and the stepped part is located on the outside of the housing at a position corresponding to the magnet. can

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

At least a portion of the support portion overlaps the step portion in a vertical direction, and the height of the support portion is formed so that the magnet does not fall off even when the support portion strikes the step portion when the second mover moves or tilts in the horizontal direction. can be

a sensor unit sensing the second mover; and a control unit configured to perform a handshake correction function feedback of the second operator through the sensed value sensed by the sensor unit.

A lateral support member coupled to the base and the driving unit to elastically support the driving unit with respect to the base, the damper may 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 positioned on the printed circuit board and including a hollow hole formed in a position corresponding to the image sensor; a support portion formed on the base and protruding upwardly outside the hollow hole; a housing spaced apart from the support and movably positioned above the base; a support member coupled to the base and the housing to elastically support it; and a stepped portion positioned on the outer circumferential surface of the housing and having a shape corresponding to the support portion, wherein a damper for improving the gain value of the resonant frequency of the support member may be applied between the support portion and the stepped portion.

An optical device according to an embodiment of the present invention includes a main body, a display unit disposed on one surface of the main body to display information, and a camera module installed in the main body to take an image or a photo, the camera module silver, printed circuit board; a base positioned on the printed circuit board and including a support portion protruding upward; a driving unit spaced apart from the support and movably positioned above the base; a stepped portion formed on an outer circumferential surface of the driving unit and having a shape corresponding to the support portion; and a damper applied between the support part and the stepped part.

Through the present invention, the oscillation phenomenon of the support member can be prevented by improving the gain value at the resonant frequency of the support member. In addition, the performance of the image stabilization function (OIS) may be improved.

1 is a perspective view of a lens driving device according to an embodiment of the present invention.
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 illustrating some components of the lens driving device according to an embodiment of the present invention as viewed from X-X' of FIG. 2 .
4 is a cross-sectional view illustrating the operation of some components of the lens driving device according to an embodiment of the present invention.
5 is a cross-sectional view illustrating 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 with reference to exemplary drawings. In adding reference numerals to the components of each drawing, it should be noted that the same components are given the same reference numerals as much as possible even though they are indicated on different drawings. In addition, in describing the embodiment of the present invention, if it is determined that a detailed description of a related known configuration or function interferes with the understanding of the embodiment of the present invention, the detailed description thereof will be omitted.

In addition, in describing the components of the embodiment of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are only for distinguishing the elements from other elements, and the essence, order, or order of the elements are not limited by the terms. When it is described that a component is "connected", "coupled" or "connected" to another component, the component may be directly connected or connected to the other component, but another component is between each component. It will be understood that may also be "connected", "coupled" or "connected".

"PCB" used below is an abbreviation of Printed Circuit Board and means a printed circuit board. In addition, "FPCB" used hereinafter is an abbreviation of Flexible Printed Circuit Board and means a flexible printed circuit board.

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

An optical device according to an embodiment of the present invention is 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), a PMP (Personal Digital Assistant) Portable Multimedia Player), navigation, etc., but is not limited thereto, and any device for taking an image or picture is possible.

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 surface of the main body to display information, and a camera installed in the main body to take images or photos It may include 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 may be coupled to the upper side of the printed circuit board. Meanwhile, a separate holder member may be positioned between the lens driving device 10 and the printed circuit board. Also, the image sensor may be mounted on 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 cut filter may block light in the infrared region from being incident on the image sensor. The infrared cut filter may be installed on the base 500 to 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 in the center of the base 500 . In an embodiment, the infrared filter may be formed of a film material or a glass material. Meanwhile, the infrared filter may have a form in which an infrared blocking coating material is disposed on a flat optical filter such as a cover glass for protecting an imaging surface or a cover glass.

In addition, the camera module may further include a lens module coupled to the lens driving device 10 . Through this structure, the light passing through the lens module mounted on the lens driving device 10 may be irradiated to the image sensor. The lens module may include one or more lenses (not shown) and a lens barrel accommodating the one or more lenses. However, one configuration of the lens module is not limited to the lens barrel, and any holder structure capable of supporting one or more lenses may be used.

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

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.

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

The cover 100 may form the exterior of the lens driving device 10 . The cover 100 may have a hexahedral shape with an open lower portion as an embodiment, but is not limited thereto. Meanwhile, the cover 100 may be mounted on 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 . In addition, the cover 100 may be mounted on the base 500 in close contact with some or all of the side surface of the base 500 to be described later. Through such a structure, the cover 100 has a function of preventing the penetration of external contaminants while protecting the internal components from external impact.

The cover 100 may, for example, be made of a metal material to serve as a shield can. In this case, the cover 100 may protect the components of the lens driving device 10 from external interference caused by a mobile 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 the upper surface to expose the lens module, which is a component of the camera module. That is, the light introduced through the opening 110 may be transmitted to the image sensor through the lens module. In addition, although the lens driving device 10 according to an embodiment does not include a lens module, the lens driving device 10 according to another embodiment may include a lens module.

The first mover 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 circumferential surface of the lens module may be coupled to the inner circumferential surface of the first mover 200 . Meanwhile, the first mover 200 may flow integrally with the lens module through interaction with the second mover 300 or the stator 400 . That is, the first mover 200 may move the lens module.

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

The bobbin 210 may be coupled to the 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 . Also, the upper portion 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 for guiding the winding or mounting of the first movable part 220 . The first guide part 211 may be integrally formed with the outer surface of the bobbin 210 . In addition, the first guide part 211 may be formed continuously along the outer surface of the bobbin 210 or may be formed to be spaced apart from each other by a predetermined interval.

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 . On the other hand, protrusions are provided on the upper support member 610 and grooves are provided on the bobbin 210 , so that both may be coupled. The bobbin 210 is provided with a total of eight coupling protrusions 213 as shown in FIG. 2 as an embodiment, and each of the coupling protrusions 213 may be coupled to each of the upper support members 610 separately provided. .

The first movable part 220 may be positioned to face the second movable part 320 of the second movable member 300 . The first movable part 220 may move the bobbin 210 with respect to the housing 310 through electromagnetic interaction with the second movable part 320 . The first movable unit 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, the coil may be disposed on the outer surface of the bobbin 210 so that, for example, four coils are independently provided so that two adjacent coils form 90° with each other. When the first movable unit 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. In addition, as another embodiment, the first movable unit 220 may include a magnet. In this case, the second mover 320 may include a coil.

The second mover 300 may be positioned outside the first mover 200 to face the first mover 200 .

The second mover 300 may include a housing 310 positioned outside the bobbin 210 . In addition, the second movable member 300 may include a second movable part 320 positioned to face 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 exterior of the lens driving device 10 . In addition, the housing 310 may be formed of an insulating material, and may be formed as an injection molding product in consideration of productivity. The housing 310 is a moving part for optical image stabilization (OIS) driving and may be disposed to be spaced apart from the cover 100 by a predetermined distance.

The housing 310 has upper and lower sides open to accommodate the first mover 200 to be movable in the vertical direction. In addition, 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 to accommodate the second movable part 320 . That is, the movable part accommodating part 311 may receive and fix the second movable part 320 . Meanwhile, the movable part accommodating part 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 is formed to protrude upward and absorbs an impact by contacting the lower side of the upper surface of the cover 100 in case of an external impact. The stoppers 312 may be formed in plurality. The stopper 312 may be provided at each of the four corners or corners as shown in FIG. 2 as an embodiment, but is not limited thereto. Meanwhile, the stopper 312 may be integrally formed 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 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, a protrusion is provided on the upper support member 610 and a groove is provided on the housing 310 so that both may be coupled. A plurality of coupling protrusions 313 may be provided in the housing 310 . A total of eight coupling protrusions 313 may be provided in the housing 310 as shown in FIG. 2 as an embodiment. However, the present invention is not limited thereto.

The housing 310 may include a stepped portion 315 formed on the outer circumferential 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 stepped portions 315 may be provided at corners where adjacent sides of the housing 310 meet each other. The stepped portion 315 may be described as being recessed at the lower side compared to the upper side. In addition, the stepped portion 315 may be described as protruding at the upper side compared to the lower side. That is, the stepped portion 315 may be formed such that the protruding portion and the depressed portion meet to be stepped. A support part 520 of the base 500 may be positioned below the stepped part 315 . A damper 800 may be applied between the stepped portion 315 and the support portion 520 . The damper 800 may improve the gain value of the resonance frequency of the support member 600 , which will be described later. In addition, the damper 800 may minimize the phenomenon that the support member 600 oscillates at the resonant frequency, and may minimize the phenomenon that the housing 310 oscillates at the second or higher resonant frequency.

The second movable part 320 may be positioned to face the first movable part 220 of the first movable member 200 . The second movable part 320 may move the first movable part 220 through electromagnetic interaction with the first movable part 220 . The second movable unit 320 may include a magnet. The magnet may be fixed to the movable part receiving part 311 of the housing 310 . The magnet may be provided with four as shown in FIG. 2 as an embodiment. The four magnets may be independently provided and disposed in the housing 310 such that two adjacent magnets form a 90° angle with each other. That is, the second movable part 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 the edge where the adjacent side surfaces of the housing 310 meet each other, and the stepped part 315 may be positioned on the outside. In addition, the second movable part 320 may be adhered to the housing 310 by 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 mover 300 . Meanwhile, the stator 400 may move the second mover 300 in a fixed state. In addition, through holes 411 and 421 corresponding to the lens module may be positioned in the center of the stator 400 .

The stator 400 may include a third movable part 410 opposite to the lower side of the second movable part 320 . In addition, the stator 400 may include a flexible printed circuit board (FPCB) 420 positioned between the third movable part 410 and the base 500 . Meanwhile, although the base 500 and the stator 400 have been described as separate configurations, the stator 400 may include the base 500 . Like the third movable unit 410 and the FPCB 420 , the base 500 is also a fixed part when the first movable member 200 and the second movable member 300 move, and thus may be included in the stator 400 .

The third movable unit 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 flow by interaction with the second movable part 320 . The third movable unit 410 may be mounted on or electrically connected to the FPCB 420 . Meanwhile, the third movable unit 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 movable part 410 is formed of an FP coil, which is a patterned coil, so that the FPCB ( 420). In addition, the third movable unit 410 may include a coil disposed at a predetermined distance from the lower portion of the second movable unit 320 , and the coil may be disposed to correspond to the number of the second movable unit 320 . That is, when the number of the second movable parts 320 is four as in the embodiment, four coils are disposed, and the coil may be mounted on the FPCB 420 or formed as an FP coil and disposed on the FPCB 420 .

The FPCB 420 may be positioned between the third movable part 410 and the base 500 . Meanwhile, the FPCB 420 may supply power to the third movable unit 410 . In addition, the FPCB 420 may supply power to the first movable unit 220 through the side support member 630 and the upper support member 610 .

The FPCB 420 may include 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 that is bent and exposed to the outside. The terminal unit 422 may be connected to an external power source, through which power may be supplied to the FPCB 420 .

The base 500 may support the stator 400 . Also, the base 500 may support the second mover 300 . A printed circuit board (not shown) may be positioned under the base 500 . The base 500 may include hollow holes 510 formed at positions 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 a side surface. In addition, a separate sensor holder (not shown) may be disposed under the base 500 . In this case, the sensor holder is disposed under the base 500, and the sensor holder may be coupled to the printed circuit board. On the other hand, the base 500 may be provided to position an infrared filter (Infrared Ray Filter) (not shown) as mentioned 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 material collecting unit (not shown) for collecting foreign materials introduced into the cover 100 as an embodiment. Meanwhile, the base 500 may further include a sensor seating groove 530 in which the sensor unit 700 is seated. The base 500 may include, for example, two independent sensor seating grooves 530 so that each of the first sensor 710 and the second sensor 720 is seated therein. 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 . A plurality of sensor seating grooves 530 may be provided to accommodate a plurality of sensors, respectively. The sensor seating groove 530 may be positioned to sense both the movement of the second mover 300 in the x-axis and y-axis directions through the first sensor 710 and the second sensor 720 . As an embodiment, a sensor seating groove 530 may be formed in a corner of the base 500 . In addition, the two sensor seating grooves 530 may form an angle of 90 degrees with respect to the optical axis.

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

The support member 600 may connect the first mover 200 and the second mover 300 . The support member 600 elastically connects the first mover 200 and the second mover 300 to allow the first mover 200 to 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 embodiment. In addition, 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 an upper portion of the first mover 200 and an upper portion of the second mover 300 . In more detail, 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 housing 310 is coupled to the second coupling recess 618 of the upper support member 610 . The protrusion 313 may be coupled. The upper support member 610 may be, for example, a leaf spring. On the other hand, the first coupling groove 617 and the second coupling groove 618 may be provided 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, an outer portion 612 connected to the housing 310, and a connection portion connecting the inner portion 611 and the outer portion 612 as an embodiment. (613) may be included. That is, the inner part 611 may be coupled to the bobbin 210 . A first coupling groove 617 is provided on the inner side 611 , and a coupling protrusion 213 is provided on the bobbin 210 so that the coupling protrusion 213 is inserted into the first coupling groove 617 . can be The outer part 612 may be coupled to the housing 310 . The outer part 612 is provided with a second coupling groove 618 , and the housing 310 is provided with a coupling protrusion 313 , so that the coupling protrusion 313 is inserted into the second coupling groove 618 . can be The connecting portion 613 may 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 integrally formed, and may be formed by bending at least twice or more. However, the present invention is not limited thereto.

The upper support member 610 may be provided separately in two, for example. Each of the separated upper support members 610 may be connected to the first movable part 220 to supply power to the first movable part 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 it to the first movable unit 220 .

Since the upper support member 610 elastically supports the bobbin 210 and the housing 310 , the bobbin 210 can vertically flow with respect to the housing 310 . That is, the autofocus function of the lens driving device 10 may be realized by elastic support of the upper support member 610 and electromagnetic interaction between 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 . In addition, 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 a horizontal direction.

In addition, the side support member 630 is coupled to the upper support member 610 as an example and may further include a configuration for absorbing shock. The configuration for absorbing the shock may be provided on any one or more of the side support member 630 and the upper support member 610 . The configuration for absorbing the shock may include an elastically deformable part (not shown). In addition, the configuration for absorbing the shock may be realized by changing the shape of any one of the side support member 630 and the upper support member 610 . A total of four side support members 630 may be provided as an embodiment. However, the present invention is not limited thereto. The lateral support member 630 may be energized with the upper support member 610 to receive power from the FPCB 420 and transmit it to the upper support member 610 . In other words, the side support member 630 may supply power supplied from the stator 400 to each of the upper support members 610 . The number of the lateral support members 630 may be determined in consideration of symmetry as an embodiment. As one embodiment, as shown in FIG. 2 , a total of four side support members 630 may be provided, one on each side of the housing 310 .

The lateral support member 630 may include, for example, a lower portion 631 , an upper portion 632 , and a connection portion 633 . In more detail, the side support member 630 may include a lower portion 631 coupled to the stator 400 or the base 500 . The side support member 630 may include an upper portion 632 coupled to the second movable member 300 or the upper support member 610 . The lateral support member 630 may include a connection part 633 elastically connecting the lower part 631 and the upper part 632 . The lateral support member 630 may be, for example, a leaf spring. In addition, the side support member 630 may be, for example, a wire. However, the present invention is not limited thereto.

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 may detect the position and/or 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 may be located on the upper surface or the lower surface of the FPCB 420 of the stator 400 to receive power from the FPCB 420 and transmit a sensed value. The sensor unit 700 may be located in a sensor seating groove 530 formed in the base 500 as an embodiment. The sensor unit 700 may include a Hall sensor as an embodiment. In this case, the relative flow of the second mover 300 with respect to the stator 400 may be sensed by sensing the magnetic field of the second mover 320 of the second mover 300 . That is, the sensor unit 720 may provide information for OIS feedback by detecting horizontal movement or tilt of the second mover 300 .

The sensor unit 700 may include a first sensor 710 and a second sensor 720 as an embodiment. The first sensor 710 may sense the movement of the second mover 300 in the x-axis direction. Meanwhile, the second sensor 720 may sense the movement of the second mover 300 in the y-axis direction. Also, the first sensor 710 may sense the movement of the second mover 300 in the y-axis direction and the second sensor 720 may sense the movement of the second mover 300 in the x-axis direction. That is, both the x-axis and y-axis movement and/or the tilt amount of the second mover 300 may be sensed through the first sensor 710 and the second sensor 720 . Furthermore, a third sensor (not shown) may be further included to sense a 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 device 10 will be described in more detail with reference to the drawings.

FIG. 3 is a cross-sectional view illustrating some components of the lens driving device according to an embodiment of the present invention as viewed from X-X' 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 mover 200 , a second mover 300 , and an upper support member 610 .

The driving unit 20 may be movably located above the base 500 . In more detail, the driving unit 20 may be supported while being spaced apart 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 positioned under the base 500 .

The driving unit 20 may be positioned to be spaced apart from the support 520 . The driving unit 20, for example, may be located inside the support 520 positioned at four corners, corners or edges of the base 500 having a rectangular cross section. That is, the flow of the driving unit 20 to the side may be restricted by the support 520 . At least a portion of the driving unit 20 may overlap the support part 520 in the horizontal direction. In addition, at least a portion of the driving unit 20 may overlap the support part 520 in the vertical direction.

As for the description of the first mover 200 and the second mover 300 of the driving unit 20 , the above description may be applied by analogy. That is, the driving unit 20 may perform an auto focus function (AF) and/or a hand shake correction function as power is applied.

The driving unit 20 may include a stepped portion 315 having a shape corresponding to the shape of the support portion 520 on the outer circumferential surface. The stepped portion 315 may include, for example, a recessed portion 315a that is recessed from the periphery and a protrusion 315b that protrudes from the periphery. That is, the stepped portion 315 may be formed by a protruding portion 315b positioned on the upper side and a depressed portion 315a positioned on the lower side. Meanwhile, the support part 520 may be positioned to be spaced apart from both the depression part 315a and the protrusion part 315b. The damper 800 may be applied to the space between the support part 520 and the protrusion part 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. In addition, a space between the support part 520 and the recessed part 315a may form a horizontal movement space of the driving unit 20 . That is, the horizontal movement space of the driving unit 20 is also limited by the space between the support part 520 and the recessed part 315a.

The support part 520 may be formed to protrude upward from the base 500 . A total of four support units 520 may be formed on edges or corners as an embodiment. However, the present invention is not limited thereto. The support part 520 may be formed to correspond to the shape of the stepped part 315 . A damper 800 may be positioned between the support part 520 and the stepped part 315 .

The damper 800 may be positioned between the support part 520 and the stepped part 315 . The damper 800 is for absorbing vibration energy, for example, and may include a cushioning material. The damper 800 may be applied to the support part 520 and the stepped part 315 to change the frequency characteristic of the support member 600 . The damper 800 may improve the gain value of the secondary resonant frequency of the support member 600 as an example. This will be described below.

Hereinafter, the operation of some components of the lens driving device 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 device according to an embodiment of the present invention. In more detail, Fig. 4 (a) shows a case in which the driving unit 20 moves to the right (A), and Fig. 4 (b) shows a case in which the driving unit 20 moves to the left (C). show

Referring to (a) of FIG. 4 , when the driving unit 20 is moved horizontally to the right (A) for OIS control, the support part 520 of the base 500 and the stepped part 315 of the driving 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 by the damper 800 applied between them. On the other hand, referring to FIG. 4(b), when the driving unit 20 is moved horizontally to the left for OIS control (C), the support part 520 of the base 500 and the stepped part of the driving unit 20 (C) 315), it can be seen that the tilt (D) in the left direction (the direction in which the right side is lifted upward) occurs by the damper 800 applied between them. On the other hand, the tilt (B, D) of Fig. 4 (a), (b) is a factor that degrades the OIS function, and it is necessary to minimize the amount.

5 is a cross-sectional view illustrating 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) may be included. 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 . On the other hand, it is necessary to minimize the amount of unexpected tilt occurring during OIS control (moving or tilting in the horizontal direction) of the driving unit 20 as previously salpinned through FIG. 4 . Accordingly, in the lens driving device 10 according to an embodiment of the present invention, an unexpected tilt amount is minimized by adjusting the height of the support part 520 of the base 500 . Meanwhile, the lens driving device 10 according to an embodiment of the present invention may be described as minimizing an unexpected tilt amount by adjusting the distance between the upper surface of the base 500 and the housing 310 .

The height of the support 520 (refer to H1 of FIG. 5 ) is, for example, minimized when the second mover 300 moves in a horizontal direction with respect to the stator 400 to perform an image stabilization function (OIS). It can be formed to be That is, the height H1 of the support part 520 may be lower than that of the support part 520 of FIG. 3 (refer to A of FIG. 5 ). In this case, as the height H1 of the support part 520 is lowered, the tilt center (rotation center) of the driving unit 20 may also be lowered, so that the tilt amount may also be reduced. That is, consideration of the improvement of the OIS function may determine the upper limit of the height of the support unit 520 .

On the other hand, the height H1 of the support part 520 is the second movable member 300 provided with a magnet even when the support part 520 strikes the stepped part 315 when the second movable member 300 is moved or tilted in the horizontal direction. It may be formed so that the movable part 320 does not fall off. That is, the support part 520 overlaps the stepped part 315 at least partially in the vertical direction, and the end of the support part 520 may be positioned equal to or higher than the center of gravity of the second movable part 320 provided with a magnet. . If the height of the support part 520 is low, the support part 520 hits the lower end of the housing 310 , and there is a risk that the magnet attached to the inner upper portion of the housing 310 with an adhesive or the like may fall off. That is, considering the magnet drop-off prevention, the lower limit of the height of the support part 520 may be determined.

That is, the height H1 of the support part 520 is, even when hitting the housing 310 while minimizing an unexpected tilt amount during OIS control of the driving unit 20, the magnet attached to the inner upper portion of the housing 310 is It can be formed so as not to fall off.

In addition, the distance H2 between the upper surface of the base 500 and the housing 310 also minimizes the unexpected tilt amount during OIS control of the driving unit 20 when the support 520 hits the housing 310 Even the magnet attached to the inner upper portion 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 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. Meanwhile, in one embodiment of the present invention, when the height of the damper 800 is added to the height H1 of the support 520 as shown in FIG. 5, the distance between the upper surface of the base 500 and the housing 310 ( H2), if any one of the height H1 of the support 520 and the distance H2 between the upper surface of the base 500 and the housing 310 is determined, the other may also be determined.

Meanwhile, as shown in FIG. 5B , the tiltable space of the driving unit 20 may be reduced by reducing the separation space between the bobbin 210 and the support part 520 of the base 500 .
As shown in FIG. 3 , the support part 520 of the base 500 includes a first area in contact with the damper 800 , and the first area of the support part 520 of the base 500 is the housing 310 . It can be arranged lower than the center of As shown in FIG. 3 , the protrusion 315b of the housing 310 includes a second region in contact with the damper 800 , and the second region of the protrusion 315b of the housing 310 is the housing 310 . It can be arranged lower than the center of As shown in FIG. 3 , the housing 310 may include an additional depression that is depressed from the upper surface of the housing 310 . 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 part 520 of the base 500 may include a portion overlapping 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.

2 is an exploded perspective view of a lens driving device according to an embodiment of the present invention, and FIGS. 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 of FIGS. 6 and 7 show the frequency characteristics of the support member 600 according to the input frequency as a gain value (G) and a phase (P), and FIG. 6 shows the damper 800 not applied. The frequency characteristic of the support member 600 at the time of application is shown, and FIG. 7 shows the frequency characteristic of the support member 600 when the damper 800 is applied.

The lens driving device 10 according to an example of the present invention may receive power from the outside through the terminal 422 of the FPCB 420 of the stator 400 . Meanwhile, the FPCB 420 may supply the supplied power to the third movable unit 410 provided with the FP coil. In addition, the FPCB 420 may supply power to the first movable unit 220 provided as a coil through the side 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 up and down based on the second movable part 300 by electromagnetic interaction with the second movable part 320 provided with a magnet. will do That is, as power is supplied to the first movable unit 220 , the bobbin 210 may move in the optical axis direction with respect to the housing 320 to perform an autofocus function.

On the other hand, 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 the movement of the first mover 200 so that auto-focus feedback may be performed and provide a sensed value to a control unit (not shown).

When power is supplied to the third movable part 410 , the second movable part 300 moves in a horizontal direction with respect to the stator 400 by electromagnetic interaction with the second movable part 320 provided with a magnet. That is, as power is supplied to the third movable unit 410 , the driving unit 20 may move in a horizontal direction with respect to the base 500 to perform a handshake correction function. However, the present invention is not limited thereto, 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 mover 300 may be sensed through the sensor unit 700 receiving 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. can That is, the sensor unit 700 may sense the horizontal movement of the second mover 300 . Furthermore, the sensor unit 700 may be provided to also detect the 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 location information on the second mover 300 provided to the control unit may be used for a handshake correction function feedback. That is, the control unit may perform the handshake correction function feedback using the position information on the second mover 300 transmitted by the sensor unit 700 .

Meanwhile, referring to FIG. 6 , when the handshake correction function feedback is performed, when the damper 800 is not applied between the driving unit 20 and the support part 520 of the base 500 , the support member 600 is It can be seen that oscillation may occur at the primary resonant frequency (E of FIG. 6 ) and the secondary resonant frequency (F of FIG. 6 ) of the support member 600 . Accordingly, in the lens driving device 10 according to an embodiment of the present invention, as shown in FIG. 7 , the damper 800 is applied between the support parts 520 of the base 500 to oscillate the support member 600 . phenomenon is minimized. 6 and 7, at the primary resonant frequency of the support member 600 shown as E of FIG. 6 and the secondary resonance frequency of the support member 600 shown as F of FIG. 6, FIG. It can be seen that the rate of change is lower than that.

In addition, deterioration of the hand-shake correction function may be caused by the damper 800 between the driving unit 20 and the base 500 . This is because an unexpected tilt of the driving unit 20 may occur due to the damper 800 during horizontal direction control of the driving unit 20 . Accordingly, in the lens driving apparatus according to an embodiment of the present invention, the deterioration of the handshake correction function is minimized by limiting the height of the support part 520 of the base 500 . Here, the height of the support part 520 (refer to H of FIG. 5 ) is adhered to the inner upper part even when hitting the housing 310 while minimizing the unexpected tilt amount during OIS control of the driving unit 20 as previously salpinned. The magnet may be formed so as not to fall off.

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

In the above, even though it has been described that all the components constituting the embodiment of the present invention operate by being combined or combined into one, the present invention is not necessarily limited to this embodiment. That is, within the scope of the object of the present invention, all the components may operate by selectively combining one or more. In addition, terms such as "comprises", "comprises" or "have" described above mean that the corresponding component may be inherent, unless otherwise specified, excluding other components. Rather, it should be construed as being able to further include other components. All terms, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs, unless otherwise defined. Terms commonly used, such as those defined in the dictionary, should be construed as being consistent with the contextual meaning of the related art, and should not be construed in an ideal or excessively formal sense unless explicitly defined in the present invention.

The above description is merely illustrative of the technical spirit of the present invention, and various modifications and variations will be possible without departing from the essential characteristics of the present invention by those skilled in the art to which the present invention pertains. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention, but to explain, and the scope of the technical spirit of the present invention is not limited by these embodiments. The protection scope of the present invention should be construed by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

100: cover
200: first operator
300: second operator
400: stator
500: base
600: support member
700: sensor unit
800: damper

Claims (20)

stator;
a housing disposed on the stator;
a bobbin disposed within the housing;
a first coil disposed on the bobbin;
a magnet disposed in the housing and facing the first coil;
an upper support member connecting the bobbin and the housing;
a side support member connecting the stator and the upper support member; and
including a damper;
The stator includes a base and a substrate including a second coil facing the magnet and disposed on the base,
The base includes an upper surface on which the substrate is disposed, and a support portion protruding from the upper surface,
The damper connects the housing and the support of the base,
The support portion of the base includes a first region in contact with the damper,
The first region of the support portion of the base is disposed lower than the center of the housing,
The housing includes a protrusion formed to protrude from the outer surface of the housing,
The protrusion of the housing includes a second region in contact with the damper,
The second region of the protrusion of the housing is disposed lower than a center of the housing. delete According to claim 1,
The housing includes a depression that is depressed from the lower surface of the housing,
At least a portion of the damper is disposed in the recessed portion of the housing. 4. The method of claim 3,
The housing is a lens driving device including a write-off depression that is depressed from the upper surface of the housing. According to claim 1,
The damper is a lens driving device for preventing oscillation at a resonant frequency by improving a resonant frequency gain value of at least one of the upper support member and the side support member. According to claim 1,
The damper is a lens driving device having viscosity and fluidity so that the housing is movable with respect to the stator while the damper connects the stator and the housing. According to claim 1,
The damper is a lens driving device overlapping the bobbin in a direction perpendicular to the optical axis direction. According to claim 1,
The support portion of the base includes a portion overlapping the bobbin in a direction perpendicular to the optical axis direction. According to claim 1,
The damper includes a first damper and a second damper disposed opposite to the first damper with respect to an optical axis. According to claim 1,
the stator comprises a plurality of sides and a plurality of corner areas between the plurality of sides;
and the damper is disposed in the plurality of corner regions of the stator. According to claim 1,
The board includes a flexible printed circuit board (FPCB) disposed on the base,
The second coil is formed as a pattern coil and is disposed on the FPCB. According to claim 1,
The damper is a lens driving device including a cushioning material. According to claim 1,
The substrate, the side support member, and the upper support member are electrically connected to the first coil. printed circuit board;
an image sensor disposed on the printed circuit board;
The lens driving device of any one of claims 1 and 3 to 13, which is 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 14 disposed on the body; and
and a display disposed on the main body and outputting an image captured by the camera module. delete delete delete delete delete

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