KR102457819B1 - Lens driving device and camera module having the same - Google Patents

Abstract

A lens driving device according to an embodiment of the present invention is provided. A lens driving device according to an embodiment of the present invention includes a housing, a bobbin disposed in the housing, a magnet disposed in the housing, a coil disposed in the bobbin and facing the magnet, and an elastic coupling to the housing and the bobbin a member, wherein the elastic member includes an outer portion coupled to the housing, an inner portion coupled to the bobbin, and a first connection portion connecting the outer portion and the inner portion, wherein the first connection portion is from the outer portion to the inner portion A first extension portion extending toward, a second extension portion bent or curved from the first extension portion, and a coupling portion connecting the second extension portion and the inner portion, any one of the upper surface and the lower surface of the bobbin A first groove overlapping the first connection part in a direction parallel to a central axis or an optical axis of the bobbin is formed on at least one surface, and the first groove has a direction parallel to the central axis or the optical axis of the bobbin As a result, a second groove overlapping the second extension portion is additionally formed.

Description

A lens driving device and a camera module including the same

The present invention relates to a lens driving device and a camera module including the same, and more particularly, to a lens driving device having an improved bobbin structure and a camera module including the same.

Recently, a portable electronic device such as a mobile phone having a built-in miniature digital camera has been developed.

A miniature digital camera mounted on a mobile phone mainly includes an image sensor that converts external light into an image, and an optical lens facing the image sensor, and is a lens driving device for adjusting the distance between the image sensor and the optical lens. A coil motor was developed.

The voice coil motor includes a mover including a bobbin on which a lens is mounted, a stator for driving the mover, an elastic member elastically connecting the mover and the stator, and a base to which the stator is fixed. And the mover moves toward a certain direction from the stator through an electromagnetic reaction with the stator.

However, when the movable member moves or receives an impact from the outside, the elastic member included in the conventional voice coil motor tilts the movable member, so that a part of the elastic member collides or interferes with the movable member.

In addition, the conventional voice coil motor has a problem in that the elastic member is easily damaged by collision or interference between the mover and the elastic member.

In order to solve the above problems, the present invention provides a voice coil motor with an improved structure of the bobbin in order to prevent the impact of the bobbin included in the elastic member and the mover.

In order to achieve the above object, the present invention provides a housing, a bobbin disposed in the housing, a magnet disposed in the housing, a coil disposed on the bobbin and facing the magnet, and an elastic member coupled to the housing and the bobbin. Including, wherein the elastic member includes an outer portion coupled to the housing, an inner portion coupled to the bobbin, and a first connection portion connecting the outer portion and the inner portion, the first connection portion toward the inner portion from the outer portion a first extension portion extending from the first extension portion, a second extension portion bent or curved from the first extension portion, and a coupling portion connecting the second extension portion and the inner portion, wherein any one of an upper surface and a lower surface of the bobbin A first groove overlapping the first connection part in a direction parallel to a central axis or an optical axis of the bobbin is formed on the surface of the first groove, and the first groove is formed in a direction parallel to the central axis or the optical axis of the bobbin. There is provided a lens driving device in which a second groove overlapping with the second extension is additionally formed.

The first groove may include a groove formed on the upper surface of the bobbin, and the second groove may include a groove c formed on the upper surface of the bobbin.

The first groove may further include a b groove formed on a lower surface of the bobbin to overlap a position where the a groove is formed, and the second groove may overlap the position where the c groove is formed. It may further include a d groove formed on the lower surface of the.

A distance from a bottom surface of the a groove to an upper surface of the bobbin may be the same as a distance from a bottom surface of the b groove to a lower surface of the bobbin.

A distance from a bottom surface of the b groove to a lower surface of the bobbin may be shorter than a distance from a bottom surface of the a groove to an upper surface of the bobbin.

A distance from the bottom surface of the c groove to an upper surface of the bobbin may be the same as a distance from the bottom surface of the d groove to a lower surface of the bobbin.

A distance from the bottom surface of the c groove to the uppermost surface of the bobbin may be different from a distance from the bottom surface of the d groove to the lowest surface of the bobbin.

The first extension portion extends in a straight line from the outer portion toward the inner portion while forming a right angle with the outer portion, and the second extension portion is formed from the first extension portion from the first extension portion based on a position at which the first extension portion is disposed. It may be formed to extend in a direction opposite to the direction in which the coupling part is disposed.

The bottom surface of the second groove may further include a cover part so as not to be connected to the coil winding part of the bobbin on which the coil is wound.

A surface connecting the first groove and the second groove may include an inclined surface.

At least two or more side surfaces of the side surfaces forming the second groove may be formed as curved surfaces.

In addition, in order to achieve the above object, the present invention provides a printed circuit board, an image sensor disposed on the printed circuit board, a housing disposed on the printed circuit board, a bobbin disposed in the housing, coupled to the bobbin, and the a lens module overlapping the image sensor in the optical axis direction, a magnet disposed on the housing, a coil disposed on the bobbin and facing the magnet, and an elastic member coupled to the housing and the bobbin, wherein the elastic member includes the housing an outer portion coupled to the bobbin, an inner portion coupled to the bobbin, and a first connection portion connecting the outer portion and the inner portion, wherein the first connection portion includes a first extension portion extending from the outer portion toward the inner portion; A second extension portion bent or curved from the first extension portion, and a coupling portion connecting the second extension portion and the inner portion, and on at least one of the upper surface and the lower surface of the bobbin, the central axis of the bobbin Alternatively, a first groove overlapping the first connection part is formed in a direction parallel to the optical axis, and a second groove overlapping the second extension part in a direction parallel to the central axis or the optical axis of the bobbin is formed in the first groove. It provides a camera module in which a groove is additionally formed.

The lens driving device and the camera module including the same according to the present invention do not cause damage to the elastic member because the bobbin and the elastic member do not collide with each other even if the bobbin is tilted according to the driving of the bobbin or an external impact, and the bobbin and the elastic member Durability lasts a little longer.

In addition, in the lens driving device and the camera module including the same according to the present invention, since the bobbin and the elastic member do not collide with each other, foreign substances generated as the bobbin and the elastic member collide with each other do not occur in the prior art.

1 is a perspective view of a lens driving device according to an embodiment of the present invention.
2 is an exploded perspective view illustrating components of a lens driving device according to an embodiment of the present invention.
3A and 3B are views showing upper and lower elastic members according to an embodiment of the present invention, respectively.
4A and 4B are respectively a perspective view showing an upper surface of a bobbin and an upper elastic member separated and a perspective view showing that an upper elastic member and a substrate are coupled to the upper surface of the bobbin according to an embodiment of the present invention.
5A and 5B are respectively a perspective view showing the lower surface of the bobbin and the lower elastic member separated and a perspective view showing that the lower elastic member and the substrate are coupled to the lower surface of the bobbin according to an embodiment of the present invention.
6 is a front view of a bobbin according to an embodiment of the present invention, taken along line VI of FIG. 4A .
7 is a front view of a bobbin according to another embodiment of the present invention.
8 is a front view of a bobbin according to another embodiment of the present invention.
9 is a perspective view of a bobbin in which a shape of a second groove is modified as a modified example of an embodiment of the present invention.

If it is determined that it is possible to do so, a detailed description thereof will be omitted.

The accompanying drawings are not drawn to scale in order to help the understanding of the invention, but the dimensions of some components may be exaggerated. Even though they are indicated in , they are indicated with the same symbols as possible.

The term or word used in the present specification and claims should not be limited to its ordinary or dictionary meaning, and the principle that the inventor may appropriately define the concept of the term in order to best describe his invention It should be interpreted as meaning and concept consistent with the technical idea of the present invention based on the In addition, in describing the components of the embodiment of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are only for distinguishing the elements from other elements, and the essence, order, or order of the elements are not limited by the terms. When it is described that a component is 'connected' or 'coupled' to another component, the component may be directly connected or coupled to the other component, but another component is between the component and the other component. It should be understood that elements may be 'connected' or 'coupled'.

Therefore, since the embodiments described in this specification and the configurations shown in the drawings are only the most preferred embodiments of the present invention and do not represent all the technical spirit of the present invention, there may be various modified embodiments of the present invention. .

First, the 'optical axis direction' used below is defined as the 'optical axis direction of a lens coupled to the lens driving device'. Meanwhile, the 'optical axis direction' may correspond to the 'vertical direction' and the 'z-axis direction'.

In addition, the 'autofocus function' used below automatically adjusts the distance to the image sensor by moving the lens in the optical axis direction according to the distance of the subject so that a clear image of the subject can be obtained on the image sensor. It is defined as a function that matches Also, 'auto focus' may be referred to as 'auto focus' or 'AF'.

Hereinafter, a lens driving device 10 according to an embodiment of the present invention will be described with reference to FIGS. 1 to 6 .

1 is a perspective view of a lens driving device according to an embodiment of the present invention, FIG. 2 is an exploded perspective view showing the components of the lens driving device according to an embodiment of the present invention, and FIGS. 3A and 3B are views, respectively It is a view showing the upper and lower elastic members according to an embodiment of the present invention. In addition, FIGS. 4A and 4B are respectively a perspective view showing the upper surface of the bobbin and the upper elastic member separated according to an embodiment of the present invention, and a perspective view showing that the upper elastic member and the substrate are coupled to the upper surface of the bobbin, respectively, FIGS. 5A and 5B is a perspective view showing the lower surface and the lower elastic member of the bobbin separated from each other according to an embodiment of the present invention, and a perspective view showing that the lower elastic member and the substrate are coupled to the lower surface of the bobbin. And, FIG. 6 is a front view of the bobbin according to an embodiment of the present invention, taken along line VI of FIG. 4A.

1 and 2, the lens driving device 10 according to an embodiment of the present invention is a voice coil motor (VCM: Voice Coil Motor), the cover 100, the base 110, the housing 120, It includes a bobbin 130 , upper and lower elastic members 140 , 150 , and a substrate 160 .

The cover 100 may have a hexahedral shape with an open lower surface, and the base 110 is coupled to the lower surface. In addition, the substrate 160 is connected to one side of the base 110 .

The housing 120 and the bobbin 130 are disposed on the upper side of the base 110 , and these housing 120 and the bobbin 130 are accommodated in the cover 100 . Accordingly, the cover 100 may form the exterior of the lens driving device 10 .

A coil winding part 136 is disposed on the outer peripheral surface of the bobbin 130 , and a bobbin hole 130 ′ is formed in the center of the bobbin. The AF driving coil 124 may be coupled to the coil winding unit 136 , and a lens (not shown) may be coupled to the bobbin hole 130 ′. In addition, the sensing magnet 123 is also coupled to the bobbin 130 .

The AF driving coil 124 may be a single coil formed integrally, and the bobbin 130 and the lens may be coupled by screws and/or adhesives.

A plurality of magnets 121 and the AF feedback sensor 122 are coupled to the housing 120 and are generally coupled by an adhesive. The plurality of magnets 121 are generally disposed to face the AF driving coil 124 . In addition, the AF feedback sensor 122 may include a Hall sensor (not shown), and is a position detection sensor.

The bobbin 130 is movably coupled from the housing 120 by the upper and lower elastic members 140 and 150 . Specifically, the bobbin 130 is disposed in the through hole 120 ′ formed inside the housing 120 , and both are connected by the upper and lower elastic members 140 and 150 .

The upper elastic member 140 may be coupled to the upper surface 120a of the housing and the upper surface 130a of the bobbin, and the lower elastic member 150 may be coupled to the lower surface 120b of the housing and the lower surface 130b of the bobbin. have.

The bobbin 130 and the housing 120 may be coupled to the upper and lower elastic members 140 and 150 by heat sealing and/or adhesive, respectively.

In the AF driving coil 124 wound around the coil winding unit 136 of the bobbin 130 , when a current is supplied to the AF driving coil 124 to form an electromagnetic field around the AF driving coil 124 , the AF driving coil 124 . ) and the plurality of magnets 121 cause electromagnetic interaction with each other, and the bobbin 130 can move in the optical axis direction with respect to the housing 120 by the upper and lower elastic members 140 and 150, that is, in the vertical direction. have.

When the bobbin 130 moves from the housing 120, the sensing magnet 123 disposed in the bobbin 130 also moves along the bobbin 130, and at this time, the AF feedback sensor disposed in the housing 130 ( 122 detects a magnetic force according to the position of the sensing magnet 123 to detect the movement of the bobbin 130 and the lens.

The AF feedback sensor 122 is generally electrically connected to the substrate 160 , and the sensed value sensed by the AF feedback sensor 122 is sent to the control unit of the electronic device through the substrate 160 to be used for AF feedback control. do.

In the above, the operation of the bobbin 130 has been described by taking as an example that the AF feedback sensor 122 is disposed on the housing 120 and the sensing magnet 123 is disposed on the bobbin 130 , but as a modified example , the AF feedback sensor 122 may be disposed on the bobbin 130 , and the sensing magnet 123 may be disposed on the housing 120 .

Referring to FIGS. 3A and 3B , the upper and lower elastic members 140 and 150 connecting the bobbin 130 and the housing 120 have outer portions 142 and 152 coupled to the housing 120 , respectively, and the bobbin 130 . ) and the inner portion (143, 153) coupled to, and the outer portion (142, 152) and the first connecting portion (141, 151) for connecting the inner portion (143, 153) includes. The inner portions 143 and 153, the outer portions 142 and 152, and the first connecting portions 141 and 151 are all integrally formed.

As shown in FIGS. 3A and 3B , four first connecting portions 141 and 151 may be formed on the upper and lower elastic members 140 and 150, respectively. However, the number of the first connection parts 141 and 151 is not limited thereto, and may be variously changed.

The first connecting portions 141 and 151 have a length sufficient to be elastically deformable, and at the same time, to be disposed between the inner portions 143 and 153 and the outer portions 142 and 152, are formed to be serpentine, and thereby The bent portions 145 and 155 of the are formed. Also, the bent portion may be a bent portion and/or a curved portion.

Although the upper elastic member 140 shown in FIG. 3A and the lower elastic member 150 shown in FIG. 3B are depicted in slightly different shapes, this is a lens such as the bobbin 130 and the housing 120 and the base 110 . In order to facilitate structural coupling with the components included in the driving device 10, the upper elastic member 140 and the lower elastic member 150 have essentially the same configuration, except that they have different shapes from a structural point of view. can have The lower elastic member may include two lower elastic units, and each of the two lower elastic units may be respectively connected to both ends of the AF driving coil. can

For a detailed description of the elastic member, for convenience, the upper and lower elastic members 140 and 150 shown in FIGS. 3A and 3B are regarded as an example of the elastic member included in the lens driving device 10 . However, the upper and lower elastic members 140 and 150 are not limited to this example, and may be formed in the same shape or may be formed in different shapes.

The first connection parts 141 and 151 include first extension parts 141a and 151a, second extension parts 141b and 151b, and coupling parts 144 and 154, and the first extension parts 141a and 151a. , the second extension parts (141b, 151b) and the coupling parts (144, 154) are all integrally connected.

The second extension parts 141b and 151b are, at the positions of the bent parts 145 and 155 shown in FIGS. 3A and 3B, one end of which is connected to the coupling parts 144 and 154, and the second extension part 141b, The other end of 151b) is connected to the first extension parts 141a and 151a while forming a predetermined angle. In addition, the coupling portions 144 and 154 extend in a direction away from the second extension portions 141b and 151b, that is, in a direction opposite to the direction in which the second extension portions 141b and 151b extend to the inner portions 143 and 153. Connected.

The first extension portions 141a and 151a extend in a straight line from the outer portions 142 and 152 toward the inner portions 143 and 153 and are formed to form a right angle with the outer portions 142 and 152 . However, the first extension portions 141a and 151a may be formed to form various angles with the outer portions 142 and 152 , and in this case, the various angles include an acute angle smaller than a right angle or an obtuse angle greater than a right angle.

The second extensions 141b and 151b extend from the first extensions 141a and 151a, and are connected to one end of the first extensions 141a and 151a with respect to the first extensions 141a and 151a. The coupling portions 144 and 154 extend in a direction opposite to the arrangement direction.

That is, the second extension portions 141b and 151b are opposite to the direction in which the first extension portions 141a and 151a are connected to the first extension portions 141a and 151a and the coupling portions 144 and 154 with respect to the first extension portions 141a and 151a. direction, extending from the first extension portions 141a and 151a.

When the bobbin 130 moves from the housing 120 , the first extension portions 141a and 151a are connected to the outer portions 142 and 152 , so that the amount of elastic deformation is not large, but the second extension portions 141b and 151b. may be elastically deformed by a rotational moment or an elastic moment generated around the first extension parts 141a and 151a.

In this case, the second extension parts 141b and 151b may collide with the bobbin 130 depending on the moving distance of the bobbin 130 or whether the bobbin 130 is tilted, and may be damaged by impact.

In order to solve this problem, as shown in FIGS. 4A, 4B and 5A and 5B , a groove is included in at least one of the upper surface 130a and the lower surface 130b of the bobbin.

In the unidirectional driving type lens driving device in which the lower surface of the bobbin 130 and the housing 120 is in contact with the base 110 in the initial state before the lens driving device is driven, one of the upper surface 130a and the lower surface 130b of the bobbin A first groove 131 is formed in any one surface.

However, in an initial state before the lens driving device is driven, the bobbin 130 and the lower surface of the housing 120 do not contact the base 110. In the lens driving device of the bidirectional driving method of the bobbin, the upper surface 130a of the bobbin It is preferable that the first grooves 131 and 133 are formed in the and the lower surface 130b, respectively.

Hereinafter, for convenience of description, the lens driving device 10 that is driven in both directions will be described as an example with reference to the bobbins 130 illustrated in FIGS. 4A, 4B and 5A and 5B .

4A, 4B and 5A, 5B , the first grooves 131 and 133 are parallel to the central axis on which the bobbin hole 130 ′ is formed, that is, the central axis and/or the optical axis direction of the bobbin 130 . In the direction, the upper surface (130a) and the lower surface (130b) of the bobbin are partially cut out.

The plurality of first grooves 131 and 133 can be divided into a groove 131 formed in the upper surface 130a of the bobbin and a groove 133 formed in the lower surface 130b of the bobbin, and the groove a ( 131) and the b groove 133 may be formed in the same number as the number of the first connection parts 141 and 151 formed in the upper and lower elastic members 140 and 150, but the number of the first connection parts 141 and 151 There may be more.

The a groove 131 and the b groove 133 may be formed at positions overlapping each other on the upper and lower surfaces 130a and 130b of the bobbin. That is, the b groove 133 may be formed in the lower surface 130b of the bobbin overlapping the position where the a groove 131 is formed. This is because the positions where the first connecting portions 141 and 151 are formed on the upper and lower elastic members 140 and 150 correspond to each other. However, in another modified embodiment, the positions of the first connecting portions 141 and 151 formed on the upper and lower elastic members 140 and 150 are different from each other, so that the a groove 131 and the b groove 133 are mutually in the optical axis direction. It may not overlap. However, in the following description, the positions of the first connecting portions 141 and 151 formed on the upper and lower elastic members 140 and 150 will be described as an example corresponding to or the same as each other.

The first grooves 131 and 133 are formed to overlap the first connecting portions 141 and 151 of the upper and lower elastic members 140 and 150 respectively coupled to the upper and lower surfaces 130a and 130b of the bobbin. Accordingly, when the first connecting portions 141 and 151 are elastically deformed, they do not come into contact with the upper and lower surfaces 130a and 130b of the bobbin.

In addition, the first grooves 131 and 133 further include second grooves 132 and 134 . That is, the second grooves 132 and 134 are formed in a direction parallel to the central axis and/or the optical axis direction of the bobbin 130 , and the bottom surfaces 131a and 133a of the first groove are further cut.

The plurality of second grooves 132 and 134 can be divided into a c groove 132 additionally formed in the a groove 131 and a d groove 134 additionally formed in the b groove 133, and the c groove The number 132 and the d groove 134 are the same as the number of the second extension parts 141b and 151b formed in the upper and lower elastic members 140 and 150 .

The c-groove 132 and the d-groove 134 may be formed at positions overlapping each other on the bottom surfaces 131a and 133a of the first groove. That is, the d-groove 134 may be formed on the bottom surface 133a of the first groove overlapping the position where the c-groove 132 is formed. This is because the positions at which the second extension parts 141b and 151b are formed correspond to the upper and lower elastic members 140 and 150 . However, in another modified embodiment, the positions of the second extension portions 141b and 151b formed on the upper and lower elastic members 140 and 150 are different from each other, so that the c groove 132 and the d groove 134 are formed in the optical axis direction. They may not overlap each other. However, hereinafter, the positions of the second extension portions 141b and 151b formed on the upper and lower elastic members 140 and 150 will be described by taking as an example that they correspond to or are the same as each other.

4B and 5B , magnets 121 are coupled to the housing 120 , and a substrate 160 is connected to one side of the housing 120 . Also, the housing 120 is connected to the bobbin 130 by upper and lower elastic members 140 and 150 . In this way, the housing 120 connected to the bobbin 130 is inserted into the cover 100 .

At this time, as shown in FIGS. 4B and 5B , the first connecting portions 141 and 151 of the upper and lower elastic members 140 and 150 are positioned above the first grooves 131 and 133 , and the second When the first connecting portions 141 and 151 are elastically deformed, the first connecting portions 141 and 151 do not contact the bobbin 130 by the first grooves 131 and 133 .

In addition, the second extension portions 141b and 151b of the upper and lower elastic members 140 and 150 are positioned above the second grooves 132 and 134 , and the second extension portions 141b and 151b are elastically deformed. In this case, the second extension portions 141b and 151b do not contact the bobbin 130 by the second grooves 132 and 134 .

Accordingly, when the first connection parts 141 and 151 and the second extension parts 141b and 151b elastically deform, the first connection parts 141 and 151 and the second extension parts 141b and 151b form the first groove 131, 133) and the second grooves 132 and 134 do not collide with the bobbin 130.

Also, as shown in FIG. 5B , the lower elastic member 150 may be electrically connected to the substrate 160 . At this time, the lower elastic member 150 is fixed to the substrate 160 by heat sealing or soldering. At this time, as shown in FIG. 5B , at least one bonding portion 156 of the lower elastic member 150 is heat-sealed or soldered to the substrate 160 . In addition, the bonding method between the lower elastic member 150 and the substrate 160 may be equally applied to the upper elastic member 140 .

In addition, although not shown in FIGS. 4B and 5B , the upper elastic member 140 may also be electrically connected to the substrate 160 . In this case, the substrate 160 may be connected to the housing 120 so as to be in contact with the upper elastic member 140 at one side of the housing 120 .

For example, the substrate 160 shown in FIG. 4B may be connected to the housing 120 such that a portion or one side of the substrate 160 is exposed in the upper surface direction of the housing 120 to which the upper elastic member 140 is connected. . In this case, the upper elastic member 140 may be fixed to the substrate 160 by heat sealing or soldering, and may be electrically connected to the substrate 160 .

Meanwhile, referring to FIG. 6 , a sensing magnet coupling groove 123 ′ to which the sensing magnet 123 is coupled may be additionally formed in the coil winding unit 136 of the bobbin 130 . However, the sensing magnet coupling groove 123 ′ may be formed at a position other than the coil winding unit 136 .

Meanwhile, the surfaces connecting the first grooves 131 and 133 and the second grooves 132 and 134 may include inclined surfaces 135a and 135b, respectively. Although the second extension parts 141b and 151b are elastically deformed by the inclined surfaces 135a and 135b, they may not collide with the bobbin 130 .

In addition, the distance d1 from the bottom surface 131a of the a groove to the upper surface 130a of the bobbin and the distance d2 from the bottom surface 133a of the b groove to the lower surface 130b of the bobbin may be formed to be the same. have.

However, the relationship between the distance values d1 and d2 is not limited thereto, and the distance d1 from the bottom surface 131a of the a groove to the upper surface 130a of the bobbin is rather than the distance d1 from the bottom surface 133a of the b groove to the lower surface of the bobbin ( The distance d2 to 130b) may be formed to be shorter. This is in consideration of the fact that the maximum movement distance of the bobbin is greater than the maximum movement distance downward. As an example, d1 may be at least 2.5 μm, and d2 may be configured at least 2.0 μm. Further, the distance values d1 and d2 may become smaller as the lens driving device 10 is miniaturized. Also, if the maximum distance that the bobbin can move downward is greater than the maximum distance that the bobbin can move, the distance value d1 may be smaller than d2.

In addition, the distance d3 from the bottom surface 132a of the c groove 132 to the upper surface 130a of the bobbin, and the bottom surface 134a of the d groove 134 to the lower surface 130b of the bobbin The distance d4 may be formed in the same way.

However, the relationship between the distance values d3 and d4 is not limited thereto, and the distance d3 from the bottom surface 132a of the c groove 132 to the upper surface 130a of the bobbin and the bottom of the d groove 134 . The distance d4 from the surface 134a to the lower surface 130b of the bobbin may be formed differently.

As described above, since the bobbin 130 according to an embodiment of the present invention includes the first grooves 131 and 133 and the second grooves 132 and 134 , when the bobbin 130 is driven, the upper and lower Collision between the elastic members 140 and 150 and the bobbin 130 does not occur.

Accordingly, in the lens driving device 10 according to an embodiment of the present invention, the service life of the upper and lower elastic members 140 and 150 is longer, and the upper and lower elastic members 140 and 150 and the bobbin 130 are longer. There is no foreign matter caused by the collision of

In addition, in the bobbin 130 according to an embodiment of the present invention, the second grooves 132 and 134 have a sufficient depth in the direction of the upper surface 130a or the lower surface 130b of the bobbin on the first grooves 131 and 133. When the second grooves 132 and 134 are viewed from the upper surface 130a or the lower surface 130b of the bobbin, a part of the AF driving coil 124 wound on the coil winding unit 136 may be seen.

Hereinafter, a bobbin 230 according to another embodiment of the present invention will be described with reference to FIG. 7 . However, the same configuration as the bobbin 130 according to an embodiment of the present invention may be simplified or omitted. In addition, the same reference numerals may be used for the same components as in an embodiment of the present invention, and repeated components may be omitted from illustration.

7 is a front view of the bobbin 230 according to another embodiment of the present invention.

The bobbin 230 includes first grooves 231 and 233 and second grooves 232 and 234 . In addition, a sensing magnet coupling groove 223 ′ to which the sensing magnet 123 is coupled may be additionally formed in the coil winding unit 236 of the bobbin 230 . However, the sensing magnet coupling groove 223 ′ may be formed at a position other than the coil winding unit 236 . In addition, the surfaces connecting the first grooves 231 and 233 and the second grooves 232 and 234 may include inclined surfaces 235a and 235b, respectively.

The first grooves 231 and 233 can be divided into a groove 231 formed on the upper surface 230a of the bobbin and a groove b 233 formed on the lower surface 230b of the bobbin, and the second groove 232, 234 may be divided into a c-groove 232 additionally formed in the a-groove 231 and a d-groove 234 additionally formed in the b-groove 233 .

The c-groove 232 and the d-groove 234 formed in the bobbin 230 according to the present embodiment further include cover portions 236a and 236b, respectively.

The cover parts 236a and 236b are configured to cover the upper and lower surfaces of the coil winding part 236, and have a thickness d5 from the top surface of the coil winding part 236 to the bottom surface 232a of the c groove and coil winding. It is configured to have a thickness d6 from the lower surface of the portion 236 to the bottom surface 234a of the d groove.

In this case, the thickness values d5 and d6 may have the same value or different values.

The cover portions 236a and 236b are integrally formed with the bottom surface 232a of the c groove and the bottom surface 234a of the d groove, and may be viewed as a part of the bottom surfaces 232a and 234a of the c groove and the d groove.

When the second extension portions 141b and 151b elastically deform the cover portions 236a and 236b, the coil 124 wound on the coil winding portion 236 and the second extension portions 141b and 151b do not contact each other. and the coil 124 and the upper and lower elastic members 140 and 150 are insulated from each other.

Hereinafter, a bobbin 330 according to another embodiment of the present invention will be described with reference to FIG. 8 . However, the same configuration as the bobbin 130 according to an embodiment of the present invention may be simplified or omitted. In addition, the same reference numerals may be used for the same components as in an embodiment of the present invention, and repeated components may be omitted from illustration.

8 is a front view of the bobbin 330 according to another embodiment of the present invention.

The bobbin 330 includes first grooves 331 and 333 and second grooves 332 and 334 . In addition, a sensing magnet coupling groove 323 ′ to which the sensing magnet 123 is coupled may be additionally formed in the coil winding portion 336 of the bobbin 330 . However, the sensing magnet coupling groove 323 ′ may be formed at a position other than the coil winding unit 336 . In addition, the surfaces connecting the first grooves 331 and 233 and the second grooves 332 and 334 may include inclined surfaces 335a and 335b, respectively.

The first grooves 331 and 333 can be divided into a groove 331 formed on the upper surface 330a of the bobbin and a groove b 333 formed on the lower surface 330b of the bobbin, and the second groove 332, 334 may be divided into a c groove 332 additionally formed in the a groove 331 and a d groove 334 additionally formed in the b groove 333 .

The height difference between the bottom surface 331a of the a groove and the bottom surface 332a of the c groove is t1, and the height difference between the bottom surface 333a of the b groove and the bottom surface 334a of the d groove is t2.

In the bobbin 130 according to an embodiment of the present invention, the height difference between the bottom surfaces 131a and 132a of the a groove and the c groove is t'1, and the height difference between the bottom surfaces 133a and 134a of the b groove and the d groove is defined as t'1. Assuming t'2, a relationship such as t1 < t'1 and t2 < t'2 may be established. Through this, the bobbin 330 can be miniaturized, and the size and volume of the overall lens driving device can be reduced.

Also, in the present embodiment, the height values t1 and t2 may be the same. However, the height values t1 and t2 may be formed differently, and when the height values t1 and t2 are formed differently, it is preferable to have a relationship of t2 < t1. This is because, in a lens driving device driven in both directions, the upper elastic member 140 is deformed relatively larger than that of the lower elastic member 150 . This is in consideration of the fact that the maximum movement distance of the bobbin is larger than the maximum movement distance downward.

Hereinafter, a bobbin 430 according to a modified embodiment of the present invention will be described with reference to FIG. 9 . The bobbin 430 according to the modified embodiment is a modified form of only the second groove in the bobbin 130 according to the embodiment of the present invention, and the same configuration as the bobbin 130 according to the embodiment of the present invention is The description may be simplified or omitted. In addition, the same reference numerals may be used for the same components as in an embodiment of the present invention, and repeated components may be omitted from illustration.

9 is a perspective view of a bobbin in which a shape of a second groove is modified as a modified example of an embodiment of the present invention.

The bobbin 430 includes a first groove 431 and a second groove 432 . In addition, a surface connecting the first groove 431 and the second groove 432 may include an inclined surface 435a, respectively.

In this case, the inclined surface 435a may be formed as a curved surface as shown in FIG. 9 . In addition, one side surface 436 of the second groove formed near the boundary between the second groove 432 and the bobbin hole 430 ′ may also have a curved surface. This is because the second extension portion 141b may have various shapes, so that the second extension portion 141b having various shapes collides with the bobbin 430 by the second groove 432 having a curved side surface. to avoid doing so.

Accordingly, in the bobbin 430 according to another embodiment of the present invention, at least one or more side surfaces 435a and 436 of the side surfaces forming the second groove 432 may be formed as curved surfaces.

However, in this embodiment, an example of forming the two side surfaces 435a and 436 forming the second groove 432 as a curved surface has been described, but it is not necessary that the two side surfaces 435a and 436 are formed with a curved surface. No, as long as the second extension portion 141b is a second groove 432 having a shape to prevent it from colliding with the bobbin 430 , the two side surfaces 435a and 436 may be configured as surfaces other than curved surfaces.

Hereinafter, a camera module according to an embodiment of the present invention will be described. However, since the camera module according to the present embodiment includes the lens driving device 10 according to an embodiment of the present invention, the same configuration may be simplified or omitted. In addition, the same reference numerals may be used for the same components, and repeated components may be omitted from illustration.

The camera module according to an embodiment of the present invention includes a lens driving device 10 according to an embodiment of the present invention, a printed circuit board (not shown), and an image sensor (not shown) disposed on the printed circuit board.

In this case, the cover 100 , the base 110 , the housing 120 and the bobbin 130 are disposed on the printed circuit board, and the lens module is coupled to the bobbin hole 130 ′ of the bobbin.

The lens module overlaps the image sensor in the optical axis direction, and refracts light incident from the subject to the image sensor.

As described above, since the camera module according to an embodiment of the present invention includes the bobbin 130 in which the first grooves 131 and 133 and the second grooves 132 and 134 are formed, when the bobbin 130 is driven, or When the shock is received, the collision between the upper and lower elastic members 140 and 150 and the bobbin 130 does not occur.

Therefore, in the camera module according to the present embodiment, the service life of the upper and lower elastic members 140 and 150 is longer, and foreign substances are generated due to the collision between the upper and lower elastic members 140 and 150 and the bobbin 130 . I never do that.

Terms such as 'include' and 'comprise' described above, unless otherwise specifically stated, mean that the corresponding component may be inherent, so other components are not excluded. It should be construed as being able to include more. All terms, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs, unless otherwise defined. Terms commonly used, such as those defined in the dictionary, should be interpreted as being consistent with the contextual meaning of the related art, and are not interpreted in an ideal or excessively formal meaning unless explicitly defined in the present invention.

In addition, various embodiments and descriptions of the present invention are merely illustrative of the technical spirit of the present invention, and those of ordinary skill in the art to which the present invention pertains may vary within the scope not departing from the essential characteristics of the present invention. Modifications and variations will be possible. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention, but to explain, and the scope of the technical spirit of the present invention is not limited by these embodiments. The protection scope of the present invention should be construed by the following claims, and all technical ideas within the equivalent range should be construed as being included in the scope of the present invention.

10: lens drive unit
100: cover
110: base
120: housing
130: bobbin
140: upper elastic member
150: lower elastic member
160: substrate

Claims (24)

housing;
a bobbin disposed in the housing;
a magnet disposed on the housing;
a coil disposed on the bobbin and facing the magnet; and
and an elastic member coupled to the housing and the bobbin,
The bobbin includes a groove formed on one surface of the bobbin,
The elastic member includes an outer portion coupled to the housing, an inner portion coupled to the bobbin, and a connecting portion connecting the outer portion and the inner portion,
The connection part includes a shape bent roundly,
The groove includes a first groove overlapping the connection part in an optical axis direction, and a second groove formed in the first groove and formed to be more concave than the first groove,
The second groove overlaps at least a portion of the roundly bent shape of the connection part in the optical axis direction and is opened to the outside of the bobbin. According to claim 1,
The roundly bent shape of the connection part is
A lens driving device closer to the connection point of the connection part and the outer part than the connection point of the connection part and the inner part. According to claim 1,
The one surface of the bobbin includes an upper surface and a lower surface of the bobbin. 4. The method of claim 3,
A depth of the first groove formed on the upper surface of the bobbin and a depth of the first groove formed on the upper and lower surfaces of the bobbin are the same. 4. The method of claim 3,
The groove formed on the upper surface of the bobbin and the groove formed on the lower surface of the bobbin overlap each other in the optical axis direction. According to claim 1,
The one surface of the bobbin is a lens driving device including a lower surface of the bobbin. According to claim 1,
The second groove is a lens driving device formed in a corner region of the housing. According to claim 1,
The second groove is formed at a position adjacent to a corner of the housing.
According to claim 1,
The elastic member includes a plurality of connecting parts,
The groove is formed in plurality,
The number of the plurality of connection parts and the number of the plurality of grooves are the same. According to claim 1,
The groove includes an inclined surface connecting a bottom surface of the first groove and a bottom surface of the second groove. According to claim 1,
One side of the second groove is a lens driving device including a curved surface. According to claim 1,
The distance from the bottom surface of the first groove to the one surface of the bobbin is the same as the distance from the bottom surface of the second groove to the bottom surface of the first groove. According to claim 1,
The distance from the bottom surface of the first groove to the one surface of the bobbin is different from the distance from the bottom surface of the second groove to the bottom surface of the first groove. According to claim 1,
The distance from the bottom surface of the first groove to the one surface of the bobbin is shorter than the distance from the bottom surface of the second groove to the bottom surface of the first groove. According to claim 1,
The distance from the bottom surface of the first groove to the one surface of the bobbin is greater than the distance from the bottom surface of the second groove to the bottom surface of the first groove. According to claim 1,
The round bent shape is disposed between the outer portion and a bobbin hole disposed at the center of the bobbin. According to claim 1,
The connecting portion includes a bent portion bent at least once or more. According to claim 1,
The connecting portion includes an extension portion connected to the outer portion and having the rounded shape, and a coupling portion connected to the extension portion and connected to the inner portion. 19. The method of claim 18,
The extension portion includes a portion protruding in a vertical direction from one surface of the outer portion. 19. The method of claim 18,
The coupling portion is a lens driving device including a rounded shape. 19. The method of claim 18,
A distance from the extension part to the area overlapping the second groove and the bottom surface of the second groove is greater than the distance from the coupling part to the area overlapping the first groove and the bottom surface of the first groove. Device. According to claim 1,
The bobbin includes a coil winding portion disposed on the outside of the bobbin,
A lens driving device in which a sensing magnet coupling groove is formed in the coil winding portion. According to claim 1,
The housing includes a feedback sensor disposed in the housing. printed circuit board;
an image sensor disposed on the printed circuit board;
The lens driving device of any one of claims 1 to 19 disposed on the printed circuit board; and
A camera module including a lens coupled to the bobbin of the lens driving device.

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