KR20220059455A - Lens driving unit and camera module including the same - Google Patents

Abstract

One embodiment of a lens driving apparatus comprises: a bobbin which moves up and down in a first direction; a housing in which the bobbin is installed therein to be movable up and down in the first direction; a cover member in which the bobbin and the housing is accommodated; and a base coupled with the cover member under the cover member. The cover member is provided in a box shape with a hollow hole on an upper side, and a first stopper restricting an upward movement distance of the bobbin is formed on an edge of the hollow hole in the first direction. The lens driving apparatus appropriately restricts movement distances of a lens or lens barrel in the first direction, a second direction, and a third direction.

Description

Lens driving unit and camera module including the same}

The embodiment relates to a lens driving device and a camera module including the same.

The content described in this section merely provides background information for the embodiment and does not constitute the prior art.

Since it is difficult to apply the technology of a voice coil motor (VCM) used in an existing general camera module to a camera module for ultra-small size and low power consumption, research related thereto has been actively conducted.

In the case of a camera module mounted on a small electronic product such as a smartphone, an auto-focusing function that automatically finds an optimal lens focus for a subject may be built-in.

In addition, the camera module may be frequently impacted during use, and the camera module may be slightly shaken according to a user's hand shake while shooting. In consideration of such a point, the development of a technology for additionally installing a hand-shake correction function to a camera module is recently required.

In order to perform the auto-focusing and hand-shake correction functions of the lens, the camera module includes a lens driving device to vertically move the lens provided in the camera module in a first direction that is an optical axis direction, and a second direction perpendicular to the first direction. direction and in a third direction.

When the lens barrel in which a lens or a plurality of lenses can form an optical system is moved in the first direction, the second direction, or the third direction by the lens driving device, parts provided in the camera module may collide with each other, such collision There is a risk that each of the parts may be damaged or damaged by the

In addition, it is necessary to appropriately limit the movement distance of the lens or the lens barrel in the first direction, the second direction, or the third direction for precise and effective auto-focusing and hand-shake correction.

Accordingly, the embodiment relates to a lens driving device capable of appropriately limiting a movement distance of a lens or a lens barrel in the first direction, the second direction, or the third direction, and a camera module including the same.

The technical task to be achieved by the embodiment is not limited to the technical task mentioned above, and other technical tasks not mentioned will be clearly understood by those of ordinary skill in the art to which the embodiment belongs from the description below.

One embodiment of the lens driving device includes: a bobbin moving up and down in a first direction; a housing in which the bobbin is installed to be vertically movable in a first direction; a cover member in which the bobbin and the housing are accommodated; and a base coupled to the cover member at a lower portion of the cover member, wherein the cover member is provided in a box shape with a hollow formed on the upper side, and limits the upward movement distance of the bobbin at an edge of the hollow. One stopper may be formed in the first direction.

The first stopper may be provided in plurality, and each may be disposed at an edge of the hollow at regular intervals in the circumferential direction.

Each of the plurality of first stoppers may be provided to be symmetrical to each other with respect to the center of the hollow.

The first stopper may be provided such that an outer surface of an upper portion of the cover member is depressed downward, and an inner surface of an upper portion of the cover member protrudes downward.

The cover member may be provided with a second stopper adjacent to each side forming the box shape from the upper side to limit the upward movement distance of the housing.

The second stopper may be provided in plurality, and each may be arranged to be symmetrical with respect to the center of the hollow.

The second stopper may be provided such that an outer surface of an upper portion of the cover member is depressed downward, and an inner surface of an upper portion of the cover member protrudes downward.

The cover member may be provided with a third stopper limiting the movement distance of the housing in the second direction or the third direction from the side.

The housing may have a first protrusion formed on a side thereof, and the third stopper and the first protrusion may be provided to face each other.

The third stopper may be provided such that an outer surface of the side of the cover member is depressed inside the cover member, and an inner surface of the side of the cover member protrudes to the inside of the cover member.

The third stopper may be formed on a flat portion of the side of the cover member.

The third stopper may be provided in plurality, and each may be provided to be symmetrical with respect to the center of the hollow.

Another embodiment of the lens driving device includes: a bobbin moving up and down in a first direction; a housing in which the bobbin is installed to be vertically movable in a first direction; a cover member in which the bobbin and the housing are accommodated; and a base coupled to the cover member at a lower portion of the cover member, wherein the bobbin is formed to protrude from an outer surface, and a fourth stopper for limiting a downward movement distance of the bobbin may be provided.

The fourth stopper may include: a second protrusion formed on the housing so that a lower surface of the first step portion for limiting a downward movement distance of the bobbin and a lower surface are opposite to each other; and a third protrusion formed to protrude upward from the second protrusion, and a portion of which comes into contact with the inner surface of the housing and guides the bobbin to move in the first direction by the housing.

At least a portion of the second protrusion may be in contact with the inner surface of the housing to guide the bobbin to move in the first direction.

The second protrusion may be provided to have a larger area than the third protrusion when viewed in the first direction.

The fourth stopper may be provided in plurality, and each may be provided to be symmetrical with respect to the center of the bobbin.

Another embodiment of the lens driving device includes: a bobbin moving up and down in a first direction; a housing in which the bobbin is installed to be vertically movable in a first direction; a cover member in which the bobbin and the housing are accommodated; and a base coupled to the cover member at a lower portion of the cover member, the first protruding downwardly from the lower portion of the bobbin, and limiting the movement distance of the bobbin in the downward direction, the second direction, or the third direction. 5 stoppers may be provided.

The base includes a fourth protrusion protruding upward, and the fifth stopper is provided such that a portion of a lower surface of the fifth stopper faces the fourth protrusion, and the bobbin moves in a downward direction by contacting the upper surface of the fourth protrusion. a fifth protrusion limiting the distance; and a sixth protrusion that is formed to protrude downward from the fifth protrusion, and a portion of which contacts the inner surface of the fourth protrusion to limit the movement distance of the bobbin in the second or third direction.

The fifth protrusion may be provided to have a larger area than the sixth protrusion when viewed in the first direction.

Another embodiment of the lens driving device includes: a bobbin moving up and down in a first direction; a first coil disposed on an outer circumferential surface of the bobbin; a housing in which the bobbin is installed to be vertically movable in a first direction; a first magnet mounted to the housing to face the first coil; a cover member in which the bobbin and the housing are accommodated; a base coupled to the cover member under the cover member; and a second coil disposed on an upper side of the base to face the first magnet, and the housing may include a sixth stopper protruding downward from a lower surface of the housing.

The sixth stopper may be provided in plurality, and each may be provided to be symmetrical with respect to the center of the housing.

The sixth stopper may be provided at a corner portion of the housing.

The sixth stopper may limit contact between the lower surface of the first magnet and the upper surface of the second coil.

The lower surface of the first magnet and the upper surface of the second coil may be provided to be spaced apart from each other, and the lower end of the sixth stopper may be provided to be lower than the lower surface of the first magnet.

The separation distance between the lower surface of the first magnet and the upper surface of the second coil may be 0.08 mm to 0.13 mm.

One embodiment of the camera module, the lens driving device; and an image sensor mounted on the lens driving device.

In an embodiment, each stopper provided in the lens driving device can prevent damage or breakage due to deformation of the support member, and has an effect of preventing damage or breakage due to the impact of the second coil.

In addition, some of the stoppers have the effect of easily controlling the resonance frequency when mechanical resonance occurs in the support member or the like.

In addition, some of the stoppers have the effect of preventing damage due to the impact of the filter provided on the lower side of the base.

1 is a perspective view illustrating a lens driving device according to an exemplary embodiment.
2 is an exploded perspective view illustrating a lens driving device according to an exemplary embodiment.
3 is a cross-sectional view illustrating a part of a lens driving device according to an exemplary embodiment.
4 is a perspective view illustrating a bobbin according to an embodiment.
5 is a bottom perspective view illustrating a bobbin according to an embodiment.
6 is a view illustrating a part of a lens driving device according to an exemplary embodiment.
7 is a bottom perspective view illustrating a housing according to an exemplary embodiment.
8 is a perspective view illustrating a part of a lens driving device according to an exemplary embodiment.
9 is a plan view illustrating a part of a lens driving device according to an exemplary embodiment.
10 is an enlarged view showing a portion A of FIG. 9 .

Hereinafter, an embodiment will be described in detail with reference to the accompanying drawings. Since the embodiment may have various changes and may have various forms, specific embodiments will be illustrated in the drawings and described in detail in the text. However, this is not intended to limit the embodiment to a specific disclosed form, and it should be understood to include all changes, equivalents, and substitutes included in the spirit and scope of the embodiment. In this process, the size or shape of the components shown in the drawings may be exaggerated for clarity and convenience of explanation.

Terms such as “first” and “second” may be used to describe various elements, but the elements should not be limited by the terms. The above terms are used only for the purpose of distinguishing one component from another. In addition, terms specifically defined in consideration of the configuration and operation of the embodiment are only for describing the embodiment, and do not limit the scope of the embodiment.

In the description of the embodiment, in the case where it is described as being formed in "up (up)" or "below (on or under)" of each element, on (on or under) ) includes both elements in which two elements are in direct contact with each other or one or more other elements are disposed between the two elements indirectly. In addition, when expressed as “up (up)” or “down (on or under)”, the meaning of not only the upward direction but also the downward direction based on one element may be included.

Also, as used hereinafter, relational terms such as "upper/upper/above" and "lower/lower/below" etc. do not necessarily require or imply any physical or logical relationship or order between such entities or elements, It may be used only to distinguish one entity or element from another entity or element.

In addition, a Cartesian coordinate system (x, y, z) may be used in the drawings. In the drawings, the x-axis and the y-axis mean axes perpendicular to the optical axis. For convenience, the optical axis direction (z-axis direction) may be referred to as a first direction, the x-axis direction may be referred to as a second direction, and the y-axis direction may be referred to as a third direction.

1 is a perspective view illustrating a lens driving device according to an exemplary embodiment. 2 is an exploded perspective view illustrating a lens driving device according to an exemplary embodiment.

An image stabilization device applied to a small camera module of a mobile device such as a smartphone or tablet PC is designed to prevent the outline of the captured image from being clearly formed due to the vibration caused by the user's hand shake when shooting still images. means the device is configured. In addition, the auto-focusing device is a device for automatically focusing the image of the subject on the surface of the image sensor (not shown). Such a hand-shake compensating device and an auto-focusing device can be configured in various ways. In the embodiment, the optical module composed of a plurality of lenses is moved in the first direction or by moving with respect to a plane perpendicular to the first direction. A correction operation and/or an auto-focusing operation may be performed.

1 and 2 , the lens driving device according to the embodiment may include a movable part. In this case, the movable unit may perform the functions of auto-focusing the lens and correcting hand shake. The movable part may include a bobbin 110 , a first coil 120 , a first magnet 130 , a housing 140 , an upper elastic member 150 , and a lower elastic member 160 .

The bobbin 110 is provided inside the housing 300, and a first coil 120 disposed inside the first magnet 130 is provided on an outer circumferential surface, and the first magnet 130 and the first coil are provided. It may be installed to be reciprocally movable in the first direction in the inner space of the housing 140 by the electromagnetic interaction between the 120 . A first coil 120 may be installed on the outer peripheral surface of the bobbin 110 to enable electromagnetic interaction with the first magnet 130 .

In addition, the bobbin 110 is elastically supported by the upper and lower elastic members 150 and 160, and can perform an auto-focusing function by moving in the first direction.

The bobbin 110 may include a lens barrel (not shown) in which at least one lens is installed. The lens barrel may be coupled to the inside of the bobbin 110 in various ways.

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

The lens coupled to the lens barrel may be configured as one sheet, or two or more lenses may be configured to form an optical system.

The auto-focusing function is controlled according to the direction of the current, and the auto-focusing function may be implemented by moving the bobbin 110 in the first direction. For example, when a forward current is applied, the bobbin 110 may move upward from the initial position, and when a reverse current is applied, the bobbin 110 may move downward from the initial position. Alternatively, the movement distance in one direction from the initial position may be increased or decreased by adjusting the amount of current in one direction.

A plurality of upper support protrusions and lower support protrusions may protrude from the upper and lower surfaces of the bobbin 110 . The upper support protrusion may be provided in a cylindrical shape or a prismatic shape, and may couple and fix the upper elastic member 150 . The lower support protrusion may be provided in a cylindrical or prismatic shape like the upper support protrusion, and may couple and fix the lower elastic member 160 .

In this case, a through hole corresponding to the upper support protrusion may be formed in the upper elastic member 150 , and a through hole corresponding to the lower support protrusion may be formed in the lower elastic member 160 . Each of the support protrusions and the through holes may be fixedly coupled to each other by thermal fusion or an adhesive member such as epoxy.

The housing 140 has a hollow column shape supporting the first magnet 130 , and may be formed in a substantially rectangular shape. The first magnet 130 and the support member 220 may be respectively coupled to the side portion of the housing 140 to be disposed. In addition, as described above, the bobbin 110 guided by the housing 140 and moving in the first direction may be disposed on the inner circumferential surface of the housing 140 .

The upper elastic member 150 and the lower elastic member 160 are coupled to the housing 140 and the bobbin 110 , and the upper elastic member 150 and the lower elastic member 160 are the first elastic members of the bobbin 110 . The upward or downward movement in the direction can be elastically supported. The upper elastic member 150 and the lower elastic member 160 may be provided as leaf springs.

As shown in FIG. 2 , the upper elastic member 150 may be provided in plurality separated from each other. Through such a multi-division structure, each of the divided portions of the upper elastic member 150 may receive currents having different polarities or different power sources. In addition, the lower elastic member 160 may also have a multi-division structure and may be electrically connected to the upper elastic member 150 .

Meanwhile, the upper elastic member 150 , the lower elastic member 160 , the bobbin 110 , and the housing 140 may be assembled through thermal fusion and/or bonding using an adhesive or the like.

The base 210 is disposed under the bobbin 110 and may be provided in a substantially rectangular shape, and the printed circuit board 250 may be seated thereon.

A support groove having a corresponding size may be formed on a surface of the base 210 facing the portion on which the terminal surface 253 is formed of the printed circuit board 250 . The support groove is formed to be concave inward to a predetermined depth from the outer circumferential surface of the base 210 , so that the portion where the terminal surface 253 is formed does not protrude to the outside or the amount of protrusion can be adjusted.

The support member 220 is disposed on the side surface of the housing 140 , the upper side is coupled to the housing 140 , and the lower side is coupled to the base 210 , and the bobbin 110 and the housing 140 are the It may be supported to be movable in the second and third directions perpendicular to the first direction, and may be electrically connected to the first coil 120 .

Since the support members 220 according to the embodiment are respectively disposed on the outer surfaces of the corners of the housing 140, a total of four may be installed symmetrically. In addition, the support member 220 may be electrically connected to the upper elastic member 150 . That is, for example, the support member 220 may be electrically connected to a portion in which a through hole of the upper elastic member 150 is formed.

In addition, since the support member 220 is formed as a separate member from the upper elastic member 150 , the support member 220 and the upper elastic member 150 may be electrically connected to each other through a conductive adhesive, solder, or the like. Accordingly, the upper elastic member 150 may apply a current to the first coil 120 through the electrically connected support member 220 .

The support member 220 may be connected to the printed circuit board 250 through the through holes formed in the circuit member 231 and the printed circuit board 250 . Alternatively, the support member 220 may be electrically soldered to a portion of the circuit member 231 in which the hole is not formed in the circuit member 231 or the printed circuit board 250 , but in which the hole is formed in the circuit member 231 .

Meanwhile, although the linear support member 220 is illustrated in FIG. 2 as an embodiment, the present invention is not limited thereto. That is, the support member 220 may be provided in the form of a plate-shaped member or the like.

The second coil 230 may perform handshake correction by moving the housing 140 in the second and/or third directions through electromagnetic interaction with the first magnet 130 .

Here, the second and third directions may include directions substantially close to the x-axis and y-axis directions as well as the x-axis and y-axis directions. That is, from the driving side of the embodiment, the housing 140 may move in parallel to the x-axis and the y-axis, but also, when moving while being supported by the support member 220, it may move slightly inclined to the x-axis and the y-axis. there is.

Accordingly, the first magnet 130 needs to be installed at a position corresponding to the second coil 230 .

The second coil 230 may be disposed to face the first magnet 130 fixed to the housing 140 . In an embodiment, the second coil 230 may be disposed outside the first magnet 130 . Alternatively, the second coil 230 may be installed to be spaced apart from the lower side of the first magnet 130 by a predetermined distance.

According to an embodiment, a total of four second coils 230 may be installed on four sides of the circuit member 231 , but the present invention is not limited thereto. One for the second direction and one for the third direction. It is also possible that only two, such as a dog, may be installed, or four or more may be installed.

In the case of an embodiment, a circuit pattern is formed in the shape of the second coil 230 on the circuit member 231 , and an additionally separate second coil may be disposed on the circuit member 231 , but the present invention is not limited thereto. A separate second coil 230 may be disposed on the circuit member 231 without forming a circuit pattern in the shape of the second coil 230 on the member 231 .

Alternatively, the second coil 230 may be formed by winding a wire in a donut shape, or the second coil 230 may be formed in the form of an FP coil and electrically connected to the printed circuit board 250 .

The circuit member 231 including the second coil 230 may be installed on the upper surface of the printed circuit board 250 disposed above the base 210 . However, the present invention is not limited thereto, and the second coil 230 may be disposed in close contact with the base 210 , may be disposed spaced apart by a predetermined distance, and may be formed on a separate substrate to attach the second coil 230 to the printed circuit board 250 . It can also be laminated.

The printed circuit board 250 is electrically connected to at least one of the upper elastic member 150 and the lower elastic member 160, is coupled to the upper surface of the base 210, and as shown in FIG. 2 , the A through hole into which the support member 220 is inserted may be formed at a position corresponding to the end of the support member 220 .

A bent terminal surface 253 on which the terminal 251 is installed may be formed on the printed circuit board 250 . A plurality of terminals 251 are disposed on the terminal surface 253 to supply current to the first coil 120 and the second coil 230 by receiving external power. The number of terminals formed on the terminal surface 253 may be increased or decreased according to the types of components that need to be controlled. Also, the printed circuit board 250 may include one or three or more terminal surfaces 253 .

The cover member 300 may be provided in a substantially box shape, accommodate the above-described movable part, the second coil 230 , a part of the printed circuit board 250 , and the like, and may be coupled to the base 210 .

The cover member 300 protects the movable part, the second coil 230, the printed circuit board 250, etc. accommodated therein from being damaged, and in particular, the first magnet 130, the first magnet accommodated therein. The electromagnetic field generated by the first coil 120 , the second coil 230 , etc. may be restricted from leaking to the outside so that the electromagnetic field is focused.

1 is a perspective view illustrating a lens driving device according to an exemplary embodiment. 3 is a cross-sectional view illustrating a part of a lens driving device according to an exemplary embodiment.

The lens driving device of the embodiment may include a first stopper 410 . As shown in FIGS. 1 and 3 , the first stopper 410 may be formed on the cover member 300 in a first direction.

Specifically, the cover member 300 is provided in a box shape in which a hollow (S) is formed on the upper side, and the first stopper 410 is located at the edge of the hollow (S) in the upper direction of the bobbin 110. may be formed, and the first stopper 410 may limit the upward movement distance of the bobbin 110 .

In addition, the first stoppers 410 may be provided in plurality, and may be disposed at an edge of the hollow S at regular intervals in the circumferential direction, respectively. In this case, the plurality of first stoppers 410 may be provided to be symmetrical to each other with respect to the center of the hollow S, respectively.

In order for the bobbin 110 to limit the upward movement distance without being inclined in the second or third direction perpendicular to the first direction, it is appropriate that the plurality of first stoppers 410 are provided to be symmetrical as described above. can

The first stopper 410 may be provided such that the outer surface of the upper portion of the cover member 300 is depressed downward, and the inner surface of the upper portion of the cover member 300 protrudes downward. The shape of the first stopper 410 may be formed by injection molding, rolling processing, or the like.

The first stopper 410 may limit an upward movement distance of the bobbin 110 in the first direction. This is because when the lens driving device performs the auto-focusing function, if the bobbin 110 moves excessively in the upward direction, it is difficult to easily and effectively control the upward movement distance of the bobbin 110, and excessive movement of the bobbin 110 This may cause excessive deformation of the upper elastic member 150 and the lower elastic member 160 .

Therefore, in order to prevent deterioration of the driving characteristics and product reliability of the lens driving device due to this reason, the first stopper 410 is formed on the cover member 300 to appropriately limit the upward movement distance of the bobbin 110 . there is.

The lower end of the first stopper 410 may contact the upper end of the bobbin 110 to appropriately limit the upward movement distance of the bobbin 110 . The length of the first stopper 410 protruding downward in the first direction, the shape of the portion of the bobbin 110 in contact with the first stopper 410 , the height, etc. are appropriately designed so that the upper side of the bobbin 110 is The direction movement distance may be appropriately limited by the first stopper 410 .

The lens driving device of the embodiment may include a second stopper 420 . The second stopper 420 may be formed on the cover member 300 as shown in FIGS. 1 and 3 . Specifically, the second stopper 420 may be formed adjacent to each side forming a box shape on the upper side of the cover member 300 .

In this case, the second stopper 420 may be provided to face the upper end of the housing 140 to limit the upward movement distance of the housing 140 . The second stoppers 420 may be provided in plurality, and may be respectively disposed to be symmetrical with respect to the center of the hollow S.

In order for the housing 140 to limit the upward movement distance without being inclined in the second or third direction perpendicular to the first direction, it is appropriate that the plurality of second stoppers 420 are provided to be symmetrical as described above. can

The second stopper 420 may be provided such that the outer surface of the upper portion of the cover member 300 is depressed downward, and the inner surface of the upper portion of the cover member 300 protrudes downward. The shape of the second stopper 420 may be formed by injection molding, rolling processing, or the like.

The second stopper 420 may limit the upward movement distance of the housing 140 in the second direction. Unlike the bobbin 110 , the housing 140 may not actively move vertically in the first direction.

However, when the lens driving device performs the handshake correction function, the housing 140 may be inclined in the second direction or the third direction, and accordingly, the housing 140 may move upward among the first directions.

At this time, since the support member 220 receives a tensile force or a bending moment while the housing 140 moves in the upward direction and can stretch in the longitudinal direction thereof, if excessive movement in the upward direction of the housing 140 is repeated, If the support member 220 is stretched beyond the elastic limit and is damaged or severe, the support member 220 may be disconnected.

Therefore, the upward movement of the housing 140 needs to be limited in order to prevent damage, disconnection, etc. of the support member 220 , and the second stopper 420 is the upward movement distance of the housing 140 . By limiting the support member 220, damage, disconnection, etc. can be suppressed.

In addition, when mechanical resonance occurs in the support member 220 by limiting the upward movement distance of the housing 140 , the resonance frequency can be easily controlled.

The lower end of the second stopper 420 may contact the upper end of the housing 140 to appropriately limit the upward movement distance of the housing 140 . The length of the second stopper 420 protruding downward in the first direction, the shape of the portion of the housing 140 in contact with the second stopper 420 , the height, etc. are appropriately designed so that the upper side of the housing 140 is The direction movement distance may be appropriately limited by the second stopper 420 .

The lens driving device of the embodiment may include a third stopper 430 . The third stopper 430 may be formed on the cover member 300 as shown in FIGS. 1 and 3 . Specifically, the third stopper 430 may be formed on the side of the cover member 300 to limit the movement distance of the housing 140 in the second direction or the third direction.

Since the bobbin 110 is supported by the housing 140 and can move in the second direction or the third direction together with the housing 140 , the third stopper 430 is disposed in the second direction of the housing 140 . By limiting the movement distance in the direction or the third direction, the movement distance in the second direction or the third direction of the bobbin 110 may be reflectively limited.

In this case, the third stopper 430 may be provided to face the outer surface of the housing 140 to limit the movement distance of the housing 140 in the second or third direction. The third stoppers 430 may be provided in plurality, and may be respectively arranged to be symmetrical with respect to the center of the hollow S.

When the lens driving device performs the handshake correction function, the housing 140 moves in the second or third direction, and the third stopper 430 moves the housing 140 in the second or third direction. It may be appropriate to be provided symmetrically as described above in order to equalize.

In the third stopper 430 , the outer surface of the side of the cover member 300 is depressed inside the cover member 300 , and the inner surface of the side of the cover member 300 is the cover member 300 . It may be provided to protrude to the inside of the. The shape of the third stopper 430 may be formed by injection molding, rolling processing, or the like.

In addition, the third stopper 430 may be formed, for example, on a planar portion of the side of the cover member 300 . Considering the structure in which it is easy to form the third stopper 430 and the outer surface of the housing 140 and the third stopper 430 can contact each other while avoiding interference with other parts or structures, the cover This is because it may be appropriate to form the third stopper 430 on a planar portion of the side of the member 300 .

The third stopper 430 may be provided to face the first protrusion 141 formed on the side surface of the housing 140 as an embodiment. In the embodiment, since a total of eight first protrusions 141 are formed on a flat portion of the outer surface of the housing 140 by two pieces, the third stopper 430 is also two on a flat portion of the side of the cover member 300 , respectively. A total of 8 dogs can be formed.

Since the third stopper 430 is provided at a position opposite to the first protrusion 141 , the third stopper 430 is provided at a position corresponding to the formation position and number of the first protrusion 141 and the number of the third stopper 430 is the cover member 300 . ) may be formed.

When the third stopper 430 is disposed at a position opposite to the first protrusion 141 , the depression depth of the third stopper 430 may be reduced, and the third stopper 430 may be disposed on the first protrusion 141 . In the case of impact, the first protrusion 141 has an effect of buffering the shock received by the housing 140 and the resulting vibration.

However, the arrangement of the third stopper 430 is not limited thereto, and for example, the third stopper 430 may be in contact with the outer surface of the housing 140 on which the first protrusion 141 is not formed. A three stopper 430 may be disposed.

When the lens driving device performs the handshake correction function, the housing 140 may move in the second or third direction, and as the housing 140 moves, the support member 220 receives a tensile force or a bending moment and the It can be stretched in the longitudinal direction.

If excessive movement of the housing 140 in the second or third direction is repeated, the support member 220 may be stretched to an extent beyond the elastic limit, resulting in damage or fatigue failure.

Accordingly, in order to suppress damage or destruction of the support member 220 , the movement of the housing 140 in the second or third direction needs to be limited, and the third stopper 430 is installed in the housing 140 . Damage, destruction, etc. of the support member 220 can be suppressed by limiting the movement distance in the second direction or the third direction. In addition, when mechanical resonance occurs in the support member 220 by limiting the movement distance of the housing 140 in the second or third direction, the resonance frequency can be easily controlled.

The third stopper 430 may contact the outer surface or the first protrusion 141 of the housing 140 to appropriately limit the movement distance of the housing 140 in the second or third direction.

The length of the third stopper 430 protruding to the inside of the cover member 300 , the outer surface of the housing 140 in contact with the third stopper 430 or the shape of the first protrusion 141 , the protrusion By appropriately designing the length, etc., the moving distance in the second or third direction of the housing 140 may be appropriately limited by the third stopper 430 .

3 is a cross-sectional view illustrating a part of a lens driving device according to an exemplary embodiment. 4 is a perspective view showing the bobbin 110 according to an embodiment. The lens driving device of the embodiment may include a fourth stopper 440 .

The fourth stopper 440 may be formed on the bobbin 110 as shown in FIGS. 3 and 4 . Specifically, the fourth stopper 440 may protrude from the outer surface of the bobbin 110 and serve to limit the downward movement distance of the bobbin 110 . In this case, the fourth stopper 440 may include a second protrusion 441 and a third protrusion 442 .

The second protrusion 441 may be provided such that the lower surface faces the first step portion 142 formed on the housing 140 to limit the downward movement distance of the bobbin 110 . Accordingly, when the bobbin 110 moves in the lower direction among the first directions, the bobbin 110 moves downward as much as the distance between the second protrusion 441 and the first step 142 of the bobbin 110 in contact with each other. can move

The third protrusion 442 is formed to protrude upward from the second protrusion 441 , and a part of it comes into contact with the inner surface of the housing 140 so that the bobbin 110 is moved to the first by the housing 140 . It can serve as a guide to move in the direction.

Meanwhile, at least a portion of the second protrusion 441 may come into contact with the inner surface of the housing 140 to guide the bobbin 110 to move in the first direction. That is, the second protrusion 441 and the third protrusion 442 may perform a common role of guiding the bobbin 110 to move in the first direction.

In this case, the second protrusion 441 may be provided to have a larger area than the third protrusion 442 when viewed in the first direction. The second protrusion 441 may limit the downward movement distance of the bobbin 110 and simultaneously serve to guide the movement of the bobbin 110 in the first direction.

Accordingly, unlike the third protrusion 442 , both the lower surface and the side surface of the second protrusion 441 may contact the housing 140 . Accordingly, it may be appropriate for the second protrusion 441 to have a larger area than the third protrusion 442 to withstand the impact with the housing 140 and to be designed to withstand wear.

In addition, the fourth stopper 440 may be provided in plurality, and each may be provided to be symmetrical with respect to the center of the bobbin 110 . In order for the bobbin 110 to limit the downward movement distance without being inclined in the second or third direction perpendicular to the first direction, it is appropriate for the plurality of fourth stoppers 440 to be provided symmetrically as described above. can

The lower end of the second protrusion 441 of the fourth stopper 440 may contact the first stepped portion 142 of the housing 140 to appropriately limit the downward movement distance of the bobbin 110 . Accordingly, the fourth stopper 440 may limit excessive movement of the bobbin 110 in the downward direction so that the downward movement distance of the bobbin 110 is within a design range.

The position and shape of the second protrusion 441 of the fourth stopper 440 on the bobbin 110 are appropriately designed, and the downward movement distance of the bobbin 110 is appropriately limited by the fourth stopper 440 . can do.

5 is a bottom perspective view showing the bobbin 110 according to an embodiment. 6 is a view illustrating a part of a lens driving device according to an exemplary embodiment. The lens driving device of the embodiment may include a fifth stopper 450 .

The fifth stopper 450 may be formed on the bobbin 110 as shown in FIGS. 5 and 6 . Specifically, the fifth stopper 450 is formed to protrude downward from the lower portion of the bobbin 110 , and serves to limit the movement distance of the bobbin 110 in the lower direction, the second direction, or the third direction. can

The fifth stopper 450 may include a fifth protrusion 451 and a sixth protrusion 452 . The fifth protrusion 451 may be provided such that a portion of its lower surface faces the fourth protrusion 211 protruding upward of the base 210 . The fifth protrusion 451 may serve to limit the downward movement distance of the bobbin 110 in the first direction by making contact with the upper surface of the fourth protrusion 211 .

The sixth protrusion 452 is formed to protrude downward from the fifth protrusion 451 , and a part of the fourth protrusion 211 comes into contact with the inner surface of the bobbin 110 in the second or third direction. It can play a role in limiting the distance traveled.

The fourth protrusion 211 may be formed to protrude upward from the upper surface of the base 210 . In this case, the upper surface of the fourth protrusion 211 may contact the lower surface of the fifth protrusion 451 to limit the downward movement distance of the bobbin 110 . In addition, the inner surface of the fourth protrusion 211 may contact some of the side surfaces of the sixth protrusion 452 to limit the movement distance of the bobbin 110 in the second or third direction.

The fourth protrusion 211 may be formed in any shape or structure as long as it can implement the above function. For example, the fourth protrusion 211 may be provided in a closed curve shape as viewed in the first direction, or may be provided in a discontinuous shape protruding from a portion corresponding to the plurality of fifth stoppers 450 . there is.

The fifth protrusion 451 may be provided to have a larger area than the sixth protrusion 452 when viewed in the first direction. A portion of the lower surface of the fifth protrusion 451 excluding the portion at which the sixth protrusion 452 protrudes downward is in contact with the upper surface of the fourth protrusion 211 to limit the downward movement distance of the bobbin 110 can For this reason, it is appropriate that the fifth protrusion 451 has a larger area than the sixth protrusion 452 when viewed in the first direction.

When the bobbin 110 moves excessively in the downward direction, the lower end of the lens barrel coupled to the bobbin 110 impacts a filter (not shown) that may be disposed below the base 210 to damage the filter. can Therefore, it is necessary to limit the downward movement distance of the bobbin 110 in order to prevent the filter from being damaged, and this role can be performed by the fifth protrusion 451 of the fifth stopper 450 .

The bobbin 110 is coupled to the inside of the housing 140 and moved in the second or third direction integrally with the housing 140 may be ideal in terms of performing a handshake correction function. However, since the bobbin 110 moves in the first direction from the inside of the housing 140 , a separation distance w1 may be formed between the outside of the bobbin 110 and the inside of the housing 140 .

Since the above separation distance w1 exists, the bobbin 110 may move in the second or third direction from the inside of the housing 140, so that the handshake correction function of the lens driving device may not be accurately performed. there is.

Accordingly, the sixth protrusion 452 has the above-described structure and limits the distance the bobbin 110 moves in the second or third direction from the inside of the housing 140 so that the hand shake compensation function of the lens driving device is precise. can be made to be performed.

Meanwhile, a plurality of the fifth stoppers 450 may be provided, and each of the fifth stoppers 450 may be disposed to be symmetrical with respect to the center of the bobbin 110 .

When the lens driving device performs an auto-focusing or hand-shake correction function, the bobbin 110 moves in the first direction, the second direction, or the third direction, and the fifth stopper 450 causes the bobbin 110 to move the first It may be appropriate to be provided so as to be symmetrical as described above so that the moving distance in the direction, the second direction, or the third direction is equal.

7 is a bottom perspective view showing the housing 140 according to an embodiment. 8 is a perspective view illustrating a part of a lens driving device according to an exemplary embodiment. 9 is a plan view illustrating a part of a lens driving device according to an exemplary embodiment. FIG. 10 is an enlarged view showing part A of FIG. 9 .

The lens driving device of the embodiment may include a sixth stopper 460 . The sixth stopper 460 may be formed in the housing 140 as shown in FIGS. 7 to 10 . In this case, the sixth stopper 460 may be formed to protrude downward from the lower surface of the housing 140 .

In addition, the sixth stopper 460 may be provided at, for example, a corner portion of the housing 140 . In addition, the sixth stopper 460 may be provided in plurality, and may be provided to be symmetrical to each other with respect to the center of the housing 140 .

In order to limit the downward movement distance of the housing 140 without being inclined in the second or third direction, it may be appropriate for the plurality of sixth stoppers 460 to be symmetrically provided as described above.

When the sixth stopper 460 is provided at the edge of the housing 140 , the lower end of the sixth stopper 460 is in contact with a portion of the circuit member 231 where the second coil 230 is not formed. Accordingly, it is possible to prevent the sixth stopper 460 from impacting the second coil 230 from damage to the second coil 230 .

As described above, unlike the bobbin 110 , the housing 140 may not actively move vertically in the first direction. However, as shown in FIG. 10 , the lower end of the first magnet 130 and the upper end of the second coil 230 are provided to face each other with a separation distance w1, so that the support member 220 is an external shock. In the case of bending by , the portion corresponding to the separation distance w1 forms a space, so that the housing 140 can move downward among the first directions.

In addition, when the lens driving device performs the hand-shake correction function, the housing 140 may be inclined in the second direction or the third direction, and accordingly, the housing 140 may move downward among the first directions.

As the housing 140 moves in the downward direction, the support member 220 may receive a tensile force or a bending moment and stretch in its longitudinal direction. Therefore, if excessive movement in the downward direction of the housing 140 is repeated, the support member 220 The support member 220 may be disconnected if it is stretched beyond the elastic limit and is damaged or severe.

Accordingly, the downward movement of the housing 140 needs to be limited in order to prevent damage or disconnection of the support member 220 , and the sixth stopper 460 is the downward movement distance of the housing 140 . By limiting the support member 220, damage, disconnection, etc. can be suppressed.

On the other hand, when the housing 140 moves excessively in the downward direction, the bobbin 110 coupled to the inner side of the housing 140 may also move excessively in the downward direction. As described above, when the bobbin 110 moves excessively in the downward direction, the lower end of the lens barrel coupled to the bobbin 110 impacts the filter that may be disposed below the base 210 to damage the filter. can do it

Therefore, it is necessary to limit the downward movement distance of the housing 140 and the bobbin 110 in order to prevent the filter from being damaged, and this role is performed by the sixth stopper 460 together with the fifth stopper 450 . can

In addition, the sixth stopper 460 may serve to limit the contact between the lower surface of the first magnet 130 and the upper surface of the second coil 230 . 8 to 10 , in the lens driving device of the embodiment, the lower end of the first magnet 130 and the second coil 230 may be provided to face each other.

Accordingly, when the housing 140 excessively moves downward, the first magnet 130 may directly impact the second coil 230 to damage or destroy the second coil 230 . Accordingly, the sixth stopper 460 limits the downward movement distance of the housing 140 to prevent direct contact between the first magnet 130 and the second coil 230 by the impact of the first magnet 130 . It is possible to prevent damage or breakage of the second coil 230 .

To this end, the lower surface of the first magnet 130 and the upper surface of the second coil 230 are provided to be spaced apart from each other, and the lower end of the sixth stopper 460 is the first magnet 130 based on the first direction. ) may be provided to be placed on the lower side than the lower surface.

That is, the separation distance w1 between the lower surface of the first magnet 130 and the upper surface of the second coil 230 is from the upper surface of the second coil 230 to the lower end of the sixth stopper 460 in the first direction. It is appropriate to be provided longer than the measured second distance w2.

In other words, since the second distance w2 is designed to be shorter than the separation distance w1 , even when the housing 140 moves downward, the lower end of the sixth stopper 460 is the upper surface of the coil member 231 . It is possible to prevent the lower end of the first magnet 130 from directly contacting the second coil 230 and impacting the second coil 230 in contact with the .

Meanwhile, in the lens driving device of the embodiment, the separation distance w1 may be 0.04 mm to 0.26 mm in a normal state in which the support member 220 is not deformed by bending, tension, or compression. In addition, more suitably, the separation distance w1 may be provided in a range of 0.08 mm to 0.13 mm in a normal state.

Meanwhile, the first to sixth stoppers described in the above embodiment may be independently provided in the lens driving device. That is, the lens driving device of the embodiment may include at least one of the first to sixth stoppers.

In an embodiment, each stopper provided in the lens driving device can prevent damage or breakage due to deformation of the support member 220 , and can prevent damage and breakage due to impact of the second coil 230 . It works.

In addition, some of the stoppers have the effect of easily controlling the resonance frequency when mechanical resonance occurs in the support member 220 or the like.

In addition, some of the stoppers have an effect of preventing damage due to the impact of the filter provided on the lower side of the base 210 .

Meanwhile, the lens driving apparatus according to the above-described embodiment may be used in various fields, for example, a camera module. For example, the camera module may be applied to a mobile device such as a mobile phone.

The camera module according to the embodiment may include a lens barrel coupled to the bobbin 110 , an image sensor (not shown), a printed circuit board 250 , and an optical system.

The lens barrel is the same as described above, and the printed circuit board 250 may form the bottom surface of the camera module from the portion where the image sensor is mounted.

In addition, the optical system may include at least one lens that transmits an image to the image sensor. In this case, an actuator module capable of performing an auto-focusing function and a hand-shake correction function may be installed in the optical system. The actuator module performing the auto-focusing function may be configured in various ways, and a voice coil unit motor is generally used. The lens driving apparatus according to the above-described embodiment may serve as an actuator module that performs both an auto-focusing function and a hand-shake correction function.

In addition, although not shown, the camera module may further include the above-mentioned filter. In this case, the filter may be an infrared cut filter. The infrared cut filter serves to block light in the infrared region from being incident on the image sensor. In this case, in the base 210 illustrated in FIG. 2 , an infrared cut filter may be installed at a position corresponding to the image sensor, and may be coupled to a holder member (not shown). In addition, the base 210 may support the lower side of the holder member.

A separate terminal member may be installed on the base 210 to conduct electricity with the printed circuit board 250 , and it is also possible to integrally form the terminal using a surface electrode or the like. Meanwhile, the base 210 may function as a sensor holder to protect the image sensor, and in this case, a protrusion may be formed in a downward direction along the side surface of the base 210 . However, this is not an essential configuration, and although not shown, a separate sensor holder may be disposed under the base 210 to perform its role.

Although only a few have been described as described above in relation to the embodiments, various other forms of implementation are possible. The technical contents of the above-described embodiments may be combined in various forms unless they are incompatible with each other, and may be implemented in a new embodiment through this.

140: housing
141: first protrusion
142: first step part
150: upper elastic member
160: lower elastic member
210: base
211: fourth protrusion
220: support member
230: second coil
300: cover member
410: first stopper
420: second stopper
430: third stopper
440: fourth stopper
441: second protrusion
442: third protrusion
450: fifth stopper
451: fifth protrusion
452: sixth protrusion
460: sixth stopper

Claims (20)

Base;
a cover member coupled to the base;
a housing disposed within the cover member; and
a bobbin disposed within the housing;
The bobbin includes a stopper protruding from the outer surface of the bobbin,
The stopper may include a first protrusion protruding from an outer surface of the bobbin in a direction perpendicular to an optical axis direction and a second protrusion protruding from an end of the first protrusion in the optical axis direction. According to claim 1,
An upper surface of the second protrusion is lower than an upper surface of the bobbin. 3. The method of claim 2,
An upper surface of the second protrusion is lower than an upper surface of the housing. According to claim 1,
Further comprising a coil disposed in a recess formed on the outer peripheral surface of the bobbin,
The second protrusion is disposed between the recess and an upper surface of the bobbin. 5. The method of claim 4,
The second protrusion is disposed between the recess and the upper surface of the housing. According to claim 1,
The housing includes a step portion accommodating the stopper,
A side surface of the first protrusion is in contact with the step portion. According to claim 1,
The second protrusion part protrudes upwardly from the first protrusion part. housing;
a bobbin disposed within the housing;
a first coil disposed on an outer circumferential surface of the bobbin; and
It includes a magnet disposed on the housing,
The bobbin includes a first stopper protruding from the outer surface of the bobbin,
The first stopper includes a first protrusion protruding from the outer surface of the bobbin in a direction perpendicular to the optical axis direction and a second protrusion protruding upward from the end of the first protrusion furthest from the outer surface of the bobbin,
An upper surface of the second protrusion is positioned below an upper surface of the bobbin. 9. The method of claim 8,
The upper surface of the second protrusion is located below the upper surface of the housing. 9. The method of claim 8,
the first coil is disposed on a recess of the bobbin;
The second protrusion is disposed between the recess and the upper surface of the housing. 9. The method of claim 8,
wherein the bobbin includes a second stopper protruding from a lower surface of the bobbin. 12. The method of claim 11,
The second stopper includes a first area having a first width and a second area having a second width smaller than the first width. 9. The method of claim 8,
a base disposed under the housing; and
The lens driving device further comprising a second coil disposed on the base. 14. The method of claim 13,
The second coil is a lens driving device disposed to correspond to the magnet. 15. The method of claim 14,
The lens driving device further comprising an elastic member disposed on the housing and the bobbin and coupled to the housing and the bobbin. housing; and
a bobbin disposed within the housing;
The bobbin includes a stopper protruding from the outer surface of the bobbin,
The housing includes a step portion,
The stopper is in contact with the step portion and includes a first protrusion that protrudes from the outer surface of the bobbin in a direction perpendicular to the optical axis direction and a second protrusion that protrudes upward from the first protrusion,
A distance from the lower surface of the first protrusion to the upper surface of the second protrusion is smaller than a distance between the step and the upper surface of the housing. 17. The method of claim 16,
A distance from the lower surface of the first protrusion to the upper surface of the second protrusion is smaller than a distance between the step portion and the upper surface of the bobbin. 17. The method of claim 16,
Further comprising a coil disposed in a recess formed on the outer peripheral surface of the bobbin,
The second protrusion is disposed between the recess and an upper surface of the bobbin. 19. The method of claim 18,
The second protrusion is disposed between the recess and the upper surface of the housing. 17. The method of claim 16,
Further comprising a magnet disposed on the housing,
The stopper is a lens driving device overlapping the magnet in the optical axis direction.

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