KR102572853B1 - Lens driving apparatus, and camera module and mobile device including the same - Google Patents

Abstract

One embodiment of the lens driving device, the bobbin is moved in a first direction, the lens barrel is screwed to the inner circumferential surface is formed with a screw thread; a first coil installed on an outer circumferential surface of the bobbin; a housing in which the bobbin is installed; a first magnet coupled to the housing; an upper elastic member provided on an upper side of the bobbin and coupled to the bobbin and the housing; a circuit member including a second coil disposed under the housing to face the first magnet; a printed circuit board disposed below the circuit member and electrically connected to the circuit member; and a plurality of support members connected to the upper elastic member, and at least two grooves may be formed on an upper surface of the bobbin.

Description

Lens driving apparatus, camera module and portable device including the same {Lens driving apparatus, and camera module and mobile device including the same}

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

The contents described in this part merely provide background information on the embodiments and do not constitute prior art.

A cell phone or smart phone equipped with a camera module that performs a function of capturing a subject and storing it as an image or video is being developed. In general, a camera module may include a lens, an image sensor module, and a lens driving device for adjusting a distance between the lens and the image sensor module.

Portable devices such as mobile phones, smart phones, tablet PCs, and laptops have built-in micro-camera modules. The lens driving device may perform auto focusing in which focal distances of the lenses are aligned by adjusting a distance between an image sensor (not shown) and the lens.

At this time, the image sensor, for example, may be mounted on a substrate disposed below the lens driving device to be opposite to the lens in the optical axis direction.

In addition, the camera module may shake slightly depending on the user's hand shake while shooting the subject. A lens with an Optical Image Stabilizer (OIS) function added to compensate for image or video distortion caused by the user's hand shake. Drives are being developed.

Accordingly, the embodiment relates to a lens driving device having a structure capable of suppressing deformation or breakage of parts during assembly, a camera module including the same, and a portable device.

The technical problem to be achieved by the embodiment is not limited to the technical problem mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art from the description below.

One embodiment of the lens driving device, the bobbin is moved in a first direction, the lens barrel is screwed to the inner circumferential surface is formed with a screw thread; a first coil installed on an outer circumferential surface of the bobbin; a housing in which the bobbin is installed; a first magnet coupled to the housing; an upper elastic member provided on an upper side of the bobbin and coupled to the bobbin and the housing; a circuit member including a second coil disposed under the housing to face the first magnet; a printed circuit board disposed below the circuit member and electrically connected to the circuit member; and a plurality of support members connected to the upper elastic member, and at least two grooves may be formed on an upper surface of the bobbin.

An embodiment of the lens driving device may suppress rotation of the bobbin when the lens barrel is coupled to the bobbin using the groove.

The groove may be formed by being depressed from an upper surface of the bobbin toward the inside of the bobbin.

The grooves may be provided in plurality and may be arranged symmetrically with respect to the center of the bobbin.

Two grooves may be formed on the upper surface of the bobbin, and may be disposed symmetrically with respect to the center of the bobbin.

The groove may be disposed at a position corresponding to a corner portion of the housing where the support member is disposed.

The groove may be disposed on a diagonal line connecting each corner portion of the housing.

An embodiment of the lens driving device may further include a cover member accommodating the bobbin, and the cover member may have an escape groove formed at a portion corresponding to the groove.

The cover member may have a through portion corresponding to an inner circumference of the bobbin, and the escape groove may be formed by recessing the through portion.

One embodiment of the lens driving device may further include a lower elastic member provided below the bobbin and coupled to the bobbin and the housing.

One embodiment of the lens driving device may further include a base disposed below the printed circuit board.

The support member may be disposed at a corner portion of the housing to elastically support the housing.

Another embodiment of the lens driving device is a bobbin that moves in a first direction and is formed with a thread to which the lens barrel is screwed to the inner circumferential surface; a first coil installed on an outer circumferential surface of the bobbin; a housing in which the bobbin is installed; a first magnet coupled to the housing; an upper elastic member provided on an upper side of the bobbin and coupled to the bobbin and the housing; a lower elastic member provided below the bobbin and coupled to the bobbin and the housing; a circuit member including a second coil disposed under the housing to face the first magnet; a printed circuit board disposed under the circuit member and electrically connected to the circuit member; a base disposed below the printed circuit board; and a plurality of support members connected to the upper elastic member, and at least two grooves may be formed on an upper surface of the bobbin.

One embodiment of the camera module may include the lens driving device.

One embodiment of a portable device includes a display module including a plurality of pixels whose color is changed by an electrical signal; The camera module converts the image incident through the lens into an electrical signal; and a control unit controlling operations of the display module and the camera module.

In the embodiment, when a groove is formed in the bobbin and a rotation restraining means is coupled to the groove to rotate the lens barrel to couple the lens barrel to the bobbin, rotation of the bobbin due to friction between the lens barrel and the bobbin is prevented. can be effectively suppressed.

Since the rotation of the bobbin is suppressed, it is possible to significantly reduce the occurrence of grinding and breakage of the bobbin and the housing due to friction between the bobbin and the housing at the contact portion between the bobbin and the housing.

Since rotation of the bobbin is suppressed, deformation of the upper elastic member, the lower elastic member, and the support member coupled to the bobbin and the housing can be effectively suppressed.

1 is a perspective view schematically 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 perspective view showing a bobbin of one embodiment.
4 is a perspective view showing a housing according to one embodiment.
5 is a cross-sectional perspective view showing a lens driving device according to an embodiment.
Figure 6 is a front view of Figure 5;
7 is a cross-sectional perspective view showing a part of the configuration of FIG. 5;
Figure 8 is a front view of Figure 7;
9 is a plan view illustrating a lens driving device according to an exemplary embodiment.
10 is a perspective view of a portable device in one embodiment.
FIG. 11 shows a configuration diagram of the portable device shown in FIG. 10 .

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. Embodiments can apply various changes and can have various forms, and specific embodiments will be illustrated in the drawings and described in detail in the text. However, this is not intended to limit the embodiments to a specific form disclosed, and should be understood to include all modifications, equivalents, or substitutes included in the spirit and technical scope of the embodiments.

Terms such as "first" and "second" may be used to describe various components, but the components should not be limited by the terms. These terms are used 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 on "upper (above)" or "lower (on or under)" of each element, on or under (on or under) ) includes both elements formed by directly contacting each other or by indirectly placing one or more other elements between the two elements. In addition, when expressed as “up (up)” or “down (down) (on or under)”, it may include the meaning of not only the upward direction but also the downward direction based on one element.

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

In addition, an orthogonal coordinate system (x, y, z) can be used in the drawing. In the drawing, the x-axis and the y-axis mean planes perpendicular to the optical axis, and for convenience, the optical axis direction (z-axis direction) can be referred to as a first direction, an x-axis direction as a second direction, and a y-axis direction as a third direction. .

1 is a perspective view schematically 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 auto focusing device applied to a small camera module of a mobile device such as a smart phone or a tablet PC is a device that automatically focuses an image of a subject on an image sensor (not shown) surface. Such an auto focusing device may be configured in various ways. In the case of an embodiment, an auto focusing operation may be performed by moving an optical module composed of a plurality of lenses in a first direction.

As shown in FIG. 2 , the lens driving device according to the embodiment may include a movable part and a fixed part. At this time, the movable unit may perform an auto focusing function of the lens. The movable part may include the bobbin 110 and the first coil 120, and the fixed part may include the first magnet 130, the housing 140, the upper elastic member 150, and the lower elastic member 160. there is.

The bobbin 110 is installed inside the housing 140 to move in a first direction, and has a first coil 120 disposed inside the first magnet 130 on an outer circumferential surface thereof, and the first magnet ( 130) and the first coil 120 may be reciprocally installed in the inner space of the housing 140 in a first direction by electromagnetic interaction. A first coil 120 is installed on the outer circumferential 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 moves in a first direction to perform an auto focusing function.

The bobbin 110 may include a lens barrel LB (see FIG. 8) in which at least one lens is installed. The lens barrel LB can be coupled to the inside of the bobbin 110 in various ways.

For example, a female screw thread is formed on the inner circumferential surface of the bobbin 110, and a male screw thread corresponding to the screw thread is formed on the outer circumferential surface of the lens barrel LB, and the lens barrel LB is formed on the bobbin ( 110) can be combined.

However, this is not limited thereto, and the lens barrel LB may be directly fixed to the inside of the bobbin 110 by a method 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 the lens barrel LB. However, in the embodiment, a case in which the bobbin 110 and the lens barrel LB are coupled by the screw coupling method described above will be described. Accordingly, a screw thread to which the lens barrel LB is screwed may be formed on the inner circumferential surface of the bobbin of the embodiment.

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

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

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 be combined with and fixed to the upper elastic member 150 by guiding the upper elastic member 150 .

The lower support protrusion may be provided in a cylindrical shape or a prismatic shape like the upper support protrusion, and may be combined with and fixed to the lower elastic member 160 by guiding the lower elastic member 160 .

The upper elastic member 150 is provided on the upper side of the bobbin 110, and the lower elastic member 160 is provided on the lower side of the bobbin 110, and may be coupled to the bobbin 110 and the housing 140, respectively. In this case, a through hole and/or a groove corresponding to the upper support protrusion may be formed in the upper elastic member 150, and a through hole and/or groove corresponding to the lower support protrusion may be formed in the lower elastic member 160.

Each of the support protrusions and through-holes and/or grooves may be fixedly coupled by thermal fusion or an adhesive such as epoxy.

The housing 140 has a hollow pillar shape supporting the first magnet 130, is formed in a substantially rectangular shape, and may be disposed inside the cover member 300. The first magnet 130 may be coupled to and disposed on the side surface of the housing 140 .

In addition, as described above, the bobbin 110 may be installed inside the housing 140 to be guided by the upper and lower elastic members 150 and 160 and move in the first direction.

In the embodiment, the first magnet 130 has a rod shape and may be coupled to or disposed on the side of the housing 140 . In another embodiment, the first magnet 130 may have a trapezoidal shape and be coupled to or disposed at a corner of the housing 140 .

Meanwhile, one or more first magnets 130 may be provided. In addition, the first magnet may be provided in a multi-layered structure in which a plurality of magnets are arranged in a first direction.

The upper elastic member 150 and the lower elastic member 160 may elastically support the upward and/or downward movement of the bobbin 110 in the first direction. The upper elastic member 150 and the lower elastic member 160 may be provided as plate springs, for example.

As shown in FIG. 2 , the upper elastic member 150 may be provided in two pieces separated from each other. Through this two-part structure, each divided part of the upper elastic member 150 can receive currents of different polarities or different power sources or can serve as a current transmission path.

Also, as a modified embodiment, the lower elastic member 160 may have a two-part structure and the upper elastic member 150 may have an integral structure.

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. At this time, for example, the fixing operation may be completed by bonding using an adhesive after heat fusion fixation.

The base 210 is disposed below the bobbin 110 and the printed circuit board 250, may be provided in a substantially rectangular shape, and the printed circuit board 250 may be seated. A support groove having a corresponding size may be formed on a surface of the base 210 facing the portion where the terminal surface 253 of the printed circuit board 250 is formed. In addition, the base 210 may be disposed below the housing 140 and coupled with the cover member 300 .

This support groove is formed concavely inward from the outer circumferential surface of the base 210 to a certain depth, so that the portion where the terminal surface 253 is formed does not protrude outward or the amount of protrusion can be adjusted.

The support member 220 is disposed at the corner of the housing 140, has an upper side coupled to and connected to the upper elastic member 150, and a lower side connected to the base 210, the printed circuit board 250 and the circuit member 231. coupled to a substrate including a, the bobbin 110 and the housing 140 can be supported so as to be movable in a second direction and/or a third direction perpendicular to the first direction, and also the first coil (120) and can be electrically connected.

The support member 220 is disposed at a corner portion of the housing 140 to elastically support the housing 140 . A plurality of support members 220 may be provided. Since each support member 220 according to the embodiment is disposed at a corner, that is, a corner portion of the housing 140, a total of four may be installed. The support member 200 may be made of an elastically deformable material so that the bobbin 110 and the housing 140 can move on the x-y plane.

Alternatively, in the case of another embodiment, a total of six may be arranged, with two at each of the two corners and one at each of the remaining two corners. Alternatively, in some cases, a total of 7 or more may be arranged.

Also, 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 of the upper elastic member 150 where the through hole 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 through conductive adhesive, soldering, or welding. can Accordingly, the upper elastic member 150 may apply current to the first coil 120 through the electrically connected support member 220 .

The lower portion of the support member may be inserted into a through hole formed in a substrate including the circuit member 231 and the printed circuit board 250, and may be coupled to the substrate by soldering. That is, the support member 220 may be electrically connected to the board by being soldered by inserting a lower portion into a through hole formed in the circuit member 231 and/or the printed circuit board 250 .

Alternatively, the support member 220 may be electrically soldered to a corresponding portion of the circuit member 231 without forming a through hole in the circuit member 231 and/or the printed circuit board 250 .

Meanwhile, in FIG. 2 , the linear support member 220 is illustrated as an embodiment, but 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 moves the housing 140 in the second and/or third directions through electromagnetic interaction with the first magnet 130, and the support member 220 elastically deforms, resulting in hand shaking. correction can be made.

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

Therefore, 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 one embodiment, the second coil 230 may be disposed outside the first magnet 130 . Alternatively, the second coil 230 may be installed on the lower side of the first magnet 130 at a predetermined distance apart. Alternatively, the second coil 230 may be disposed below the housing 140 to face the first magnet 130 .

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

Alternatively, 1 on the 1st side for the 2nd direction, 2 on the 2nd side for the 2nd direction, 1 on the 3rd side for the 3rd direction, and 2 on the 4th side for the 3rd direction, for a total of 6 It could be. Alternatively, in this case, the first side and the fourth side may be adjacent to each other, and the second side and the third side may be adjacent to each other.

In the embodiment, a circuit pattern may be formed on the circuit member 231 in the shape of the second coil 230, or a separate second coil may be disposed on the circuit member 231, but is not limited thereto, and the circuit pattern is not limited thereto. A circuit pattern may be formed directly on the member 231 in the shape of the second coil 230 .

Alternatively, it is also possible to configure the second coil 230 by winding a wire in a donut shape or to form the second coil 230 in an FP coil shape and electrically connect it to the printed circuit board 250.

The circuit member 231 including the second coil 230 may be installed or disposed on an upper surface of the printed circuit board 250 disposed above the base 210 . However, it is not limited thereto, and the second coil 230 may be disposed in close contact with the base 210 or may be disposed apart from each other by a certain distance, and may be formed on a separate substrate to attach the substrate to the printed circuit board 250. Stacked connections are also possible.

The substrate is disposed between the housing 140 and the base 210 and may include a circuit member 231 and a printed circuit board 250 . At this time, the circuit member 231 and the printed circuit board 250 may be electrically connected to each other.

The circuit member 231 may include a second coil 230 disposed to face the first magnet 130 and may be disposed above the printed circuit board 250 .

The printed circuit board 250 is disposed below the circuit member 231, is electrically connected to at least one of the upper elastic member 150 and the lower elastic member 160, and is formed on the upper surface of the base 210. It is coupled, and a through hole into which the support member 220 is inserted may be formed at a position corresponding to an end of the support member 220 . Alternatively, the through hole may not be formed and may be electrically connected to or bonded to the support member.

In another embodiment, when the support member 220 is coupled to the circuit member 231, the support member 220 and the circuit member ( 231) may be formed to facilitate a bonding operation such as soldering between them.

The printed circuit board 250 may be coupled to the upper surface of the base 210, disposed below the circuit member 231, and electrically connected to the circuit member 231. A terminal surface 253 disposed on a side surface of the base 210 and in which a terminal 251 is installed may be formed on the printed circuit board 250 . In the embodiment, a printed circuit board 250 having two bent terminal faces 253 is shown.

A plurality of terminals 251 are disposed on the terminal surface 253 to receive current from an external power source and supply current to the first coil 120 and the second coil 230 . The number of terminals 251 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 more terminal surfaces 253 .

The cover member 300 may be provided in the form of a box having corners, accommodate part or all of the movable part, the second coil 230, and the printed circuit board 250, and combine with the base 210. can The cover member 300 can protect the movable part, the second coil 230, the printed circuit board 250, etc. accommodated therein from being damaged.

In addition, the cover member 300 additionally restricts leakage of the electromagnetic field generated by the first magnet 130, the first coil 120, the second coil 230, etc. accommodated therein to the outside so that the electromagnetic field is focused. may make it so.

Hereinafter, structures of the bobbin 110 and the housing 140 will be described in more detail with reference to FIGS. 3 and 4 . 3 is a perspective view showing the bobbin 110 of one embodiment.

The bobbin 110 may include a first upper support protrusion 113 and a third protrusion 111 . The first upper support protrusion 113 is a portion to which a through hole formed in the upper elastic member 150 is coupled. The first upper support protrusion 113 may be formed in a cylindrical shape or various other shapes, and may couple the upper elastic member 150 to the bobbin 110 by guiding the upper elastic member 150 .

The third protrusion 111 may protrude from the upper surface of the bobbin 110 . When an external impact occurs, the upper surface of the third protrusion 111 collides with the lower surface of the cover member 300, thereby preventing plastic deformation exceeding the elastic limit of the spring.

When the initial position of the bobbin 110 is set to a position where the bobbin 110 cannot descend any further, auto focusing of the bobbin 110 may be implemented as one-way control. That is, when the amount of current supplied to the first coil 120 increases, the bobbin 110 rises, and when the amount of current supplied decreases, the bobbin 110 gradually descends and returns to the initial position. can be implemented

However, when the initial position of the bobbin 110 is set to have a separation distance through which the bobbin 110 can descend, auto focusing of the bobbin 110 can be implemented with bi-directional control. That is, the auto focusing function may be implemented through an operation of moving the bobbin 110 upward or downward in the first direction.

For example, when a forward current is applied, the bobbin 110 may move upward, and when a reverse current is applied, the bobbin 110 may move downward.

4 is a perspective view showing a housing 140 according to one embodiment. The housing 140 may support the magnet 130 and accommodate the bobbin 110 moving in the first direction therein.

The housing 140 may have a hollow column shape as a whole. For example, the housing 140 may have a polygonal (eg, quadrangular or octagonal) or circular hollow.

The housing 140 may include a second upper support protrusion 143 and a fourth protrusion 144 . The second upper support protrusion 143 is a portion to which the through hole formed in the upper elastic member 150 is coupled.

The second upper support protrusion 143 may be formed in a cylindrical shape or other various shapes, and may couple the upper elastic member 150 to the housing 140 by guiding the upper elastic member 150 .

The fourth protrusion 144 may protrude from the upper surface of the housing 140 . The fourth protrusion 144 may serve to stop the cover member 300 and the body of the housing 140 from each other. That is, when an external shock occurs, the upper surface of the fourth protrusion 144 collides with the lower surface of the cover member 300, thereby preventing the cover member 300 from directly colliding with the body of the housing 140. .

The housing 140 may have a third recessed portion 148 at a position corresponding to a portion where the first width W1 (see FIG. 3 ) of the bobbin 110 is formed.

A surface of the third concave portion 148 of the housing 140 facing the bobbin 110 may have a shape matching the first width W1 , which is a portion protruding from the bobbin 110 . At this time, the first width W1 of the bobbin 110 shown in FIG. 3 and the second width W2 of the third recessed portion 148 of the housing 140 shown in FIG. 4 may have a certain tolerance. .

The rotation of the bobbin 110 with respect to the housing 140 may be suppressed as the third concave portion 148 is arranged to match the first width W1 of the bobbin 110 . Accordingly, even when the bobbin 110 is forced to rotate around the optical axis or an axis parallel to the optical axis, the third recessed portion 148 of the housing 140 can suppress rotation of the bobbin 110 .

In addition, a second through hole 147 may be formed at a corner of the housing 140 . The support member 220 may pass through the second through hole 147 in a first direction and be connected to the upper elastic member 150 .

In the embodiment, since a total of four support members 220 are disposed, one for each corner of the housing 140, the second through hole 147 is also supported at a position corresponding to the support member 220 in the embodiment. A total of four, which is the same number as the number of members 220, may be provided. Of course, if the number of support members 220 changes, the number of second through holes 147 may also change accordingly.

In another embodiment, a recessed portion through which the support member 220 passes may be formed instead of the second through hole 147 at a corner portion of the housing 140 . As described above, the number of recesses may vary according to the number of support members 220 .

On the other hand, the housing 140 may be provided with a lower support protrusion (not shown) on the lower surface of the corner portion of the housing 140 for coupling with the lower elastic member 160 . The lower support protrusion may have a shape corresponding to a position corresponding to the upper support protrusion, but is not limited thereto.

The housing 140 may include a plurality of third stoppers 149 protruding from the side of each side. The third stopper 149 may serve to prevent collision with the cover member 300 when the housing 140 moves in the second and third directions.

5 is a cross-sectional perspective view showing a lens driving device according to an embodiment. Figure 6 is a front view of Figure 5; As shown in FIGS. 5 and 6 , in the embodiment, a groove 700 may be formed in the bobbin 110 .

When the lens barrel LB is coupled to the bobbin 110, a rotation restraining means 10 for suppressing rotation of the bobbin 110 of the lens barrel LB may be coupled to the groove 700. In the lens driving device of the embodiment, the lens barrel LB may be coupled to the bobbin 110 by screwing.

That is, the bobbin 110 has a screw thread SC screwed to the lens barrel LB on an inner circumferential surface, and an outer circumferential surface of the lens barrel LB is formed to match the screw thread SC formed on the bobbin 110. Threads may be formed.

In order to couple the lens barrel LB to the screw thread SC of the bobbin 110, the lens barrel LB is rotated. At this time, the bobbin ( 110) can rotate.

When the bobbin 110 rotates, a pressing force may be applied to a portion where the bobbin 110 and the housing 140 where the bobbin 110 is installed come into contact. This pressing force may cause a grinding phenomenon due to friction between the bobbin 110 and the housing 140 at the contact portion between the bobbin 110 and the housing 140, and in severe cases, breakage of the bobbin 110 and the housing 140.

In addition, when the bobbin 110 rotates, the housing 140 can also rotate, and when the bobbin 110 and the housing 140 rotate, the upper elastic member 150 and the lower elastic member 160 coupled to them , The support member 220, etc. are deformed, and they may be damaged or plastic deformation may occur, resulting in defects in the lens driving device.

Therefore, when the lens barrel LB is rotated to screw the lens barrel LB into the bobbin 110, rotation of the bobbin 110 is suppressed so that the bobbin 110, the housing 140, and the upper elastic member 150, the lower elastic member 160, the support member 220, etc. need to be prevented from cracking, damage, deformation, and the like.

In order to suppress the rotation of the bobbin 110 during the lens barrel (LB) coupling operation, a rotation restraining means 10 may be used. The rotation control means 10 may be, for example, a jig provided in an external lens driving device assembling device.

When the lens barrel LB is coupled to the bobbin 110 in a state where the rotation restraining means 10 holds the bobbin 110, the rotation restraining means 10 causes the bobbin 110 to rotate. Therefore, rotation of the bobbin 110 can be suppressed even when the lens barrel LB is rotated to be screwed to the bobbin 110.

Therefore, the rotation restraining means 10 is coupled to the bobbin 110 to hold the bobbin 110, and when the coupling operation of the lens barrel LB is completed, the rotation restraining means 10 moves the bobbin 110 to the bobbin 110. A structure that can be easily detached from is required.

A structure that allows the rotation restraining means 10 to be easily attached to and detached from the bobbin 110 is a defect groove formed in the bobbin 110. That is, as the groove 700 is formed in the bobbin 110, when the lens barrel LB rotates to be coupled to the bobbin 110, the rotation restraining means 10 moves through the groove 700. It is possible to suppress the rotation of the bobbin 110 by combining with.

As shown in FIGS. 5 and 6 , the groove 700 may be formed, for example, by being recessed into the bobbin 110 from the upper surface of the bobbin 110 . Meanwhile, it may be appropriate that the groove 700 is provided in a plurality of two or more.

If the groove 700 is provided as one and the lens barrel (LB) coupling operation is performed in a state in which one rotation restraining means 10 is coupled to the groove 700, the groove 700 is the center As the bobbin 110 can be rotated.

Therefore, in order to more stably and reliably suppress the rotation of the bobbin 110, the grooves 700 are provided in a plurality of two or more, and two or more plurality of rotation restraining means 10 are provided in the grooves 700. It is necessary to engage and hold the bobbin 110.

Meanwhile, each of the plurality of grooves 700 may be arranged symmetrically with respect to the center of the bobbin 110 . In order to most certainly and stably suppress the rotation of the bobbin 110, it is appropriate to hold the bobbin 110 at symmetrical positions around the bobbin 110.

Therefore, in order for the rotation restraining means 10 to hold the bobbin 110 at a position symmetrical to each other around the bobbin 110, the plurality of grooves 700 are positioned at corresponding positions, that is, the bobbin 110 ), it is appropriate to arrange them so that they are symmetrical to each other with respect to the center of .

In addition, it may be appropriate that two grooves 700 are formed on the upper surface of the bobbin 110 and arranged symmetrically with respect to the center of the bobbin 110 .

When three or more of the grooves 700 are formed, the number of grooves 700 that become empty spaces in the bobbin 110 increases, so that the mechanical strength of the bobbin 110 is lowered, so that the bobbin 110 may be easily damaged by external impact. there is

In addition, since the lens driving device of the embodiment is a subminiature device, it may be difficult to secure a space for forming a large number of grooves 700 on the bobbin 110 .

In addition, when the lens barrel LB is coupled after assembling the cover member 300 in the lens driving device of the embodiment, the rotation restraining means 10 is provided at a portion corresponding to the groove 700 in the cover member 300. It should form a through hole or escape.

In this case, the portion exposed to the outside may increase due to the formation of the through hole or the relief portion in the cover member 300 .

External foreign substances may flow into the lens driving device through such an exposed portion, and the introduced external foreign substances may deteriorate the performance of the lens driving device. Therefore, it may be appropriate to minimize the formation of the through hole or relief in the cover member 300 .

For the above reasons, it is necessary to reliably and stably suppress the rotation of the bobbin 110 and minimize the number of grooves 700. In the case where this is satisfied, the number of grooves 700 is formed as two. it may be

For the same reason as described above, it may be appropriate to arrange the two grooves 700 symmetrically with respect to the center of the bobbin 110 .

In the embodiment, a groove 700 is formed in the bobbin 110, and the rotation restraining means 10 is coupled to the groove 700, thereby coupling the lens barrel LB to the bobbin 110. When LB is rotated, rotation of the bobbin 110 due to friction between the lens barrel LB and the bobbin 110 can be effectively suppressed.

As the rotation of the bobbin 110 is suppressed, grinding occurs due to friction between the bobbin 110 and the housing 140 at the contact area between the bobbin 110 and the housing 140, and damage to the bobbin 110 and the housing 140 occurs. incidence can be significantly reduced.

By suppressing the rotation of the bobbin 110, deformation of the upper elastic member 150, the lower elastic member 160, the support member 220, etc. coupled to the bobbin 110 and the housing 140 can be effectively suppressed. there is.

7 is a cross-sectional perspective view showing a part of the configuration of FIG. 5; Figure 8 is a front view of Figure 7; As shown in FIGS. 7 and 8 , a plurality of grooves 700 are provided, and each groove 700 has a position corresponding to a corner portion of the housing 140 where the support member 220 is disposed. can be placed in

When the bobbin 110 and the housing 140 rotate, the support member 220 disposed at the corner of the housing 140 is highly likely to undergo plastic deformation.

Accordingly, when an operation of screwing the lens barrel LB to the bobbin 110 is performed, it is necessary to more reliably suppress plastic deformation of the supporting member 220 due to rotation of the bobbin 110 .

When the bobbin 110 and the housing 140 rotate, the part having the smallest rotation angle is the groove 700 to which the rotation restraining means 10 is coupled.

Therefore, by disposing the groove 700 adjacent to the support member 220, even if the bobbin 110 and the housing 140 rotate, the rotation angle is small, so that the plastic deformation of the support member 220 can be effectively suppressed. can

Therefore, in order to effectively suppress the plastic deformation of the support member 220, it may be appropriate to place the groove 700 at a position corresponding to the corner portion of the housing 140.

In other words, it may be appropriate that the housing 140 has a substantially rectangular shape, and the groove 700 is arranged on a diagonal line connecting each corner of the housing 140, that is, each corner.

Due to this structure, the support member 220 and the rotation restraining means 10 are disposed adjacent to each other, and rotation of the bobbin 110 and the housing 140 is minimized by the rotation restraining means 10, Plastic deformation of the support member 220 can be effectively suppressed.

Referring to FIG. 8, a coupling operation of the lens barrel LB is as follows. First, the housing 140 in which the bobbin 110 is installed is disposed on a work table of a lens driving device assembly device (not shown).

At this time, after assembling the cover member 300, the lens barrel LB may be coupled, or after completing the lens barrel LB, the cover member 300 may be assembled.

Next, the bobbin 110 is held by inserting the end of the rotation restraining means 10 into the groove 700 . Of course, the rotation restraining means 10 serves to suppress rotation of the bobbin 110 .

Next, the lens barrel LB is coupled to the screw thread SC formed on the inner circumferential surface of the bobbin 110 . At this time, the lens barrel LB is rotated to be coupled to the screw thread SC of the bobbin 110.

At this time, the rotation restraining means 10 can suppress rotation of the bobbin 110 due to friction between the lens barrel LB and the bobbin 110 .

Next, when screwing of the lens barrel LB to the bobbin 110 is completed, the rotation restraining means 10 is separated from the groove 700 and the bobbin 110 . Therefore, as shown in Figure 8, the rotation restraining means 10 may be provided to be movable up and down.

9 is a plan view illustrating a lens driving device according to an exemplary embodiment. The cover member 300 covers the bobbin 110 and can accommodate the bobbin 110, and as shown in FIG. 9, an escape groove 340 is formed in a portion corresponding to the groove 700. can

Specifically, the cover member 300 may have a through portion 330 corresponding to an inner circumference of the bobbin 110, and the escape groove 340 may be formed by recessing the through portion 330.

Referring to FIG. 7 , since the bobbin 110 is provided to move in a first direction with respect to the housing 140, it may be appropriate to reduce its cross-sectional area as much as possible when viewed in the first direction for smooth movement in the first direction.

Therefore, as shown in FIG. 9, the depression groove may be disposed adjacent to the through portion 330 formed in the central portion of the cover member 300, and the escape groove through which the rotation control means 10 passes. 340 may be formed by recessing the through portion 330 on the x-y plane at a portion corresponding to the groove 700 .

Meanwhile, foreign substances may flow into the lens driving device through the through portion 330 including the recessed groove. To suppress the inflow of foreign substances, for example, the through portion 330 It can be applied with an adhesive.

In another embodiment, a cover (not shown) capable of suppressing the inflow of foreign substances may be disposed on the front portion of the lens driving device.

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

The camera module according to the embodiment may include a lens barrel LB coupled to the bobbin 110 and an image sensor (not shown). At this time, the lens barrel LB may include at least one lens that transmits an image to the image sensor.

In addition, the camera module may further include an infrared cut filter (not shown). 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). Also, the holder member may support the lower side of the base 210 .

A separate terminal member may be installed on the base 210 to conduct electricity with the printed circuit board 250, or the terminal may be integrally formed using a surface electrode or the like. In addition, if the lens driving device includes a separate substrate, there may be no separate terminal member.

Meanwhile, the base 210 may function as a sensor holder to protect the image sensor, and in this case, a protrusion may be formed downward along a side surface of the base 210 . However, this is not an essential configuration, and although not shown, a separate sensor holder may be disposed below the base 210 to perform its role.

10 is a perspective view of a portable device 200A in one embodiment. FIG. 11 shows a configuration diagram of the portable device 200A shown in FIG. 10 .

10 and 11, a portable device (200A, hereinafter referred to as “device”) includes a body 850, a wireless communication unit 710, an A/V input unit 720, a sensing unit 740, an input/output unit, It may include an output unit 750, a memory unit 760, an interface unit 770, a control unit 780, and a power supply unit 790.

Various electronic components of the device may be embedded in the space formed between the front case 851 and the rear case 852 of the body 850 .

The wireless communication unit 710 may include, for example, a broadcast reception module 711, a mobile communication module 712, a wireless Internet module 713, a short-distance communication module 714, and a location information module 715. there is.

An audio/video (A/V) input unit 720 is for inputting an audio signal or a video signal, and may include a camera 721 and a microphone 722.

The camera 721 may be a camera including the lens driving device 100 according to the embodiment.

The sensing unit 740 detects the current state of the device 200A, such as the open/closed state of the device 200A, the location of the device 200A, whether or not there is a user contact, the direction of the device 200A, and the acceleration/deceleration of the device 200A. By sensing, a sensing signal for controlling the operation of the device 200A may be generated. In addition, it is responsible for sensing functions related to whether or not the power supply unit 790 supplies power and whether or not the interface unit 770 is connected to an external device.

The input/output unit 750 is for generating input or output related to sight, hearing, or touch. The input/output unit 750 may generate input data for controlling the operation of the device 200A, and may also display information processed by the device 200A.

The input/output unit 750 may include a keypad unit 730, a display module 751, a sound output module 752, and a touch screen panel 753. The keypad unit 730 may generate input data by keypad input.

The display module 751 may include a plurality of pixels whose colors change according to electrical signals.

The audio output module 752 outputs audio data received from the wireless communication unit 710 in a call signal reception mode, a call mode, a recording mode, a voice recognition mode, or a broadcast reception mode, or stored in the memory unit 760. Audio data can be output.

The touch screen panel 753 may convert a change in capacitance caused by a user's touch to a specific area of the touch screen into an electrical input signal.

The memory unit 760 may store programs for processing and control of the control unit 780, input/output data, images captured by the camera 721, and the like.

The interface unit 770 receives data from an external device or receives power and transmits it to each component inside the device 200A, or transmits data inside the device 200A to an external device. The controller 780 may control overall operations of the device 200A. The controller 780 may include the panel controller 144 of the touch screen panel driving unit shown in FIG. 1 or may perform the function of the panel controller 144 .

The controller 780 may include a multimedia module 781 for playing multimedia. The controller 780 may perform a pattern recognition process capable of recognizing handwriting input or drawing input performed on the touch screen as characters and images, respectively.

The power supply unit 790 may receive external power or internal power under the control of the control unit 780 to supply power necessary for the operation of each component.

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 through this, may be implemented in a new embodiment.

10: rotation restraint means
110: bobbin
120: first coil
130: first magnet
140: housing
150: upper elastic member
160: lower elastic member
210: base
220: support member
230: second coil
231: circuit member
250: printed circuit board
300: cover member

Claims (15)

a cover member including a top plate and a through portion formed in the top plate;
a bobbin disposed within the cover member;
A first coil and a first magnet disposed between the bobbin and the cover member to move the bobbin in an optical axis direction,
The bobbin,
an upper surface of the cover member facing the top plate; and
Including a groove formed on the upper surface of the bobbin,
The cover member includes an escape groove formed in the upper plate and facing the groove of the bobbin in the optical axis direction;
The escape groove of the cover member is recessed from the inner circumferential surface of the upper plate formed by the through portion and exposes the groove of the bobbin. According to claim 1,
a housing disposed within the cover member;
the bobbin is disposed within the housing;
The bobbin includes a protrusion protruding from an outer surface of the bobbin,
The housing includes a third recessed groove in which the protruding part of the bobbin is disposed. According to claim 2,
The lens driving device of claim 1 , wherein the groove of the bobbin is disposed on an upper surface of the protrusion of the bobbin. According to claim 1,
The groove of the bobbin includes a first groove and a second groove spaced apart from each other,
The escape groove of the cover member includes a first escape groove corresponding to the first groove of the bobbin and a second escape groove corresponding to the second groove of the bobbin. According to claim 2,
The protrusion includes a first protrusion and a second protrusion spaced apart from each other,
The third recessed groove is formed in the housing to correspond to each of the first protrusion and the second protrusion of the bobbin. According to claim 5,
The groove of the bobbin includes a first groove and a second groove,
At least a portion of the first groove is disposed on an upper surface of the first protrusion,
At least a portion of the second groove is disposed on an upper surface of the second protrusion,
The escape groove of the cover member includes a first escape groove corresponding to the first groove of the bobbin and a second escape groove corresponding to the second groove of the bobbin. According to claim 2,
The first coil is disposed on the bobbin, and the first magnet is disposed on the housing. According to claim 2,
an upper elastic member disposed above the bobbin and coupled to the bobbin and the housing;
a second coil disposed under the housing to face the first magnet;
a circuit board disposed below the housing and electrically connected to the second coil; and
a support member electrically connecting the upper elastic member and the circuit board; and
A lens driving device including a base disposed below the circuit board. According to claim 8,
The bobbin includes a first upper support protrusion disposed on the upper surface of the bobbin and coupled to the upper elastic member;
A diameter of the groove of the bobbin is greater than a diameter of the first upper support protrusion. According to claim 1,
A screw thread is formed on the inner circumferential surface of the bobbin,
When the bobbin and the lens barrel are coupled, the groove of the bobbin is combined with a jig for suppressing rotation of the bobbin. According to claim 1,
The escape groove of the cover member overlaps with the groove of the bobbin in the optical axis direction, and does not overlap with the groove of the bobbin in a direction perpendicular to the optical axis direction. a cover member including a top plate and a through portion formed in the top plate;
a housing disposed within the cover member;
a bobbin disposed within the housing;
a first magnet disposed in the housing;
a first coil disposed on the bobbin;
an upper elastic member coupled to an upper portion of the bobbin and an upper portion of the housing;
a second coil facing the first magnet in an optical axis direction;
a circuit board electrically connected to the second coil; and
A support member coupled to the upper elastic member and electrically connected to the circuit board;
The bobbin,
an upper surface of the cover member facing the top plate;
a groove formed on the upper surface of the bobbin; and
A first upper support protrusion disposed on the upper surface of the bobbin and coupled to the upper elastic member;
The cover member includes an escape groove formed on the top plate to overlap with the groove of the bobbin in the optical axis direction, the escape groove is recessed from an inner circumferential surface of the top plate formed by the through portion,
A diameter of the groove of the bobbin is greater than a diameter of the first upper support protrusion. According to claim 12,
The bobbin includes a protrusion protruding from an outer surface of the bobbin,
The housing includes a third recessed groove in which at least a part of the protrusion of the bobbin is disposed,
At least a part of the groove of the bobbin is disposed on an upper surface of the protrusion of the bobbin. According to claim 12,
The groove of the bobbin includes a first groove and a second groove spaced apart from each other,
The escape groove of the cover member includes a first escape groove corresponding to the first groove of the bobbin and a second escape groove corresponding to the second groove of the bobbin. a lens driving device according to any one of claims 1 to 14;
a lens coupled to the bobbin; and
A camera module including an image sensor.

Images