KR102505840B1 - Lens moving apparatus and camera module including the lens moving apparatus - Google Patents

Abstract

Embodiments include a housing, a bobbin disposed in the housing and movable in a direction parallel to the optical axis, an elastic member coupled to the bobbin and the housing, and a damping unit coupled to the elastic member and the housing, wherein the elastic member engages with an upper portion of the bobbin. An inner frame, an outer frame coupled to the upper portion of the housing, a connection portion connecting the inner frame and the outer frame, and an extension portion protruding from the connection portion, wherein the connection portion includes a first end connected to the inner frame and a second end connected to the outer frame. It includes an end and an intermediate portion connecting the first and second ends, the extension portion extending from the intermediate portion, and the damping portion being adhered to the extension portion and the housing.

Description

Lens driving device and camera module including the same

The present embodiment relates to a lens driving device, and more particularly, to a lens driving device that prevents vibration of a bobbin in an optical axis direction by damping vibration of a bobbin in an optical axis direction during lens driving or auto focusing.

In recent years, the development of IT products such as mobile phones, smart phones, tablet PCs, and laptops with built-in micro digital cameras has been actively conducted.

In the case of an IT product in which a conventional subminiature digital camera is built-in, a lens driving device that aligns the focal length of the lens by adjusting the distance between an image sensor that converts external light into a digital image or a digital image and a lens is built-in.

However, in order to perform an autofocus function, a conventional compact digital camera has a control process of finding a point where the clearest image is created in the image sensor based on the sharpness of the digital image formed on the image sensor according to the distance between the lens and the image sensor. configured to run. When such an autofocus method is executed, the bobbin on which the lens is mounted moves in the optical axis direction, and when the bobbin moves in the optical axis direction, vibration in the optical axis direction may occur in the bobbin. When the frequency of the vibration of the bobbin in the optical axis direction approaches or coincides with the natural frequency of the bobbin and the housing, a resonance phenomenon occurs between the bobbin and the housing connected to each other by an elastic member.

Accordingly, an object of this embodiment is to provide a lens driving device that solves the problems of the prior art.

Specifically, an object of the present embodiment is to provide a lens driving device that eliminates a resonance phenomenon during lens driving or auto focusing.

In addition, another object of the present embodiment is to provide a lens driving device that more efficiently removes a resonance phenomenon during lens driving or auto focusing.

A lens driving device according to an embodiment includes a housing; a bobbin disposed within the housing and movable in a direction parallel to the optical axis; an elastic member coupled to the bobbin and the housing; and a damping part coupled to the elastic member and the housing, wherein the elastic member includes an inner frame coupled to an upper portion of the bobbin, an outer frame coupled to an upper portion of the housing, and a connection portion connecting the inner frame and the outer frame. , And an extension portion protruding from the connection portion, wherein the connection portion includes a first end connected to the inner frame, a second end connected to the outer frame, and an intermediate portion connecting the first end and the second end. The extension part extends from the middle part, and the damping part is attached to the extension part and the housing.

The damping unit may be disposed closer to the outer frame than to the inner frame.

The extension portion may extend from the middle portion toward the housing in a horizontal direction.

The damping part may overlap the extension part in a direction parallel to the optical axis and may not overlap the connection part in a direction parallel to the optical axis.

The extension portion may include a first end connected to the intermediate portion; and a second end disposed opposite to the second end, and the damping unit may be adhered to the second end of the extension and to the housing. The second end of the extension portion may be positioned closer to the outer frame than to the inner frame.

A length of the extension from the first end of the extension to the second end of the extension may be shorter than a length of the connection from the first end of the connection to the second end of the connection.

The connection part may have a shape that is bent at least once.

The extension part may be spaced apart from the inner frame and the outer frame.

The housing may include an accommodation groove corresponding to the extension part, and a portion of the damping part may be disposed between the extension part and the accommodation groove of the housing.

The second end of the extension portion may include a hole, and a portion of the damping portion may be disposed between the hole of the extension portion and the housing.

The housing may include an accommodating groove corresponding to the second end of the extension, and a portion of the damping part may be disposed between the second end of the extension and the accommodating groove of the housing.

The connection part may include four connection parts corresponding to the four corners of the housing and spaced apart from each other, the extension part may include four extension parts corresponding to the four connection parts, and the damping part may include It may include four damping parts corresponding to the four extension parts, and each of the four damping parts may be attached to a corresponding one of the four extension parts.

The lens driving device includes a magnet disposed in the housing; and a coil disposed on the bobbin and moving the bobbin in a direction parallel to the optical axis by interaction with the magnet, and the damping unit may absorb vibration generated by movement of the bobbin.

The lens driving device includes a sensing magnet disposed on the bobbin; and a position sensor corresponding to the sensing magnet and disposed in the housing.

A lens driving device according to another embodiment includes a housing; a bobbin disposed within the housing; a coil disposed on the bobbin; a magnet disposed on the housing to correspond to the coil; an elastic member coupled to the bobbin and the housing; and a damping part coupled to the elastic member and the housing, wherein the elastic member includes an inner frame coupled to an upper portion of the bobbin, an outer frame coupled to an upper portion of the housing, and a connection portion connecting the inner frame and the outer frame. , And an extension part protruding from the connection part, wherein the damping part is bonded to a part of the extension part and the housing, and when viewed from above, the extension part is disposed between the inner frame and the outer frame, and the inner frame and It may be spaced apart from the outer frame.

When viewed from above, the damping unit may be disposed closer to the outer frame than to the inner frame.

When viewed from above, the damping unit may be disposed between the connecting unit and the outer frame.

A camera module according to an embodiment includes a lens; A lens driving device according to an embodiment; and an image sensor.

According to the above-described problem solving means, the present embodiment includes a damping unit between at least one elastic member of the upper elastic member and the lower elastic member and the housing, thereby damping the vibration of the bobbin in the optical axis direction during lens driving or auto focusing. can Due to this, the present embodiment can remove a resonance phenomenon in the optical axis direction of the lens driving device during lens driving or auto focusing. As a result, the present embodiment can prevent damage or breakage of the upper elastic member and/or the lower elastic member connecting the bobbin and the housing.

In addition, the present embodiment can increase the damping area of the damping unit by providing a coupling part for damping that increases the attachment area of the damping unit between the bobbin and the housing, thereby reducing the resonance phenomenon during lens operation or auto focusing. It can be removed efficiently, and the attachment stability of the damping part between the bobbin and the housing can be improved.

1 is a schematic perspective view of a lens driving device according to an embodiment of the present invention;
2 is a schematic exploded perspective view of a lens driving device according to an embodiment of the present invention;
3 is a schematic perspective view of the lens driving device in FIG. 1 from which the cover member is removed;
Figure 4 is a schematic plan view of Figure 3,
5 is a schematic perspective view of a housing according to one embodiment of the present embodiment;
6 is a schematic perspective view of the housing viewed from an angle different from that of FIG. 5;
7 is a schematic bottom perspective view of a housing according to one embodiment of the present embodiment;
8 is a schematic exploded perspective view of a housing according to one embodiment of the present embodiment;
9 is a schematic plan view of an upper elastic member according to an embodiment of the present embodiment;
10 is a schematic plan view of a lower elastic member according to an embodiment of the present embodiment;
11 is a schematic perspective view of a bobbin according to one embodiment of the present embodiment,
12 is a schematic bottom perspective view of the bobbin according to one embodiment of the present embodiment,
13 is a schematic exploded perspective view of a bobbin according to an embodiment of the present embodiment;
14 is a partially enlarged perspective view of FIG. 13;
15 is a partially enlarged bottom view of FIG. 13;
16 is a schematic partially enlarged perspective view of a receiving groove according to an embodiment of the present embodiment;
17 is a schematic longitudinal cross-sectional view of a bobbin according to one embodiment of the present embodiment,
18 is a schematic partially enlarged perspective view of a damping unit and a damping connection unit according to an embodiment of the present invention;
19 is a schematic partially enlarged plan view of a damping unit and a damping connection unit according to an embodiment of the present invention;
20 is a schematic partially enlarged longitudinal cross-sectional view of a damping unit and a damping connection unit according to one embodiment of the present embodiment taken along line AA of FIG. 19;
21 is a schematic partially enlarged plan view of an extension for damping according to a first additional embodiment of the present embodiment;
22 is a schematic partially enlarged plan view of an extension for damping according to a second additional embodiment of the present embodiment;
23 is a schematic partially enlarged plan view of an extension for damping according to a third additional embodiment of the present embodiment;
24 is a schematic partially enlarged plan view of an extension for damping according to a fourth additional embodiment of the present embodiment;
25 is a schematic longitudinal cross-sectional view of a receiving groove for damping according to a further embodiment of the present embodiment;
26 is a schematic plan view and a partially enlarged view of a damping unit and a damping connection unit according to another embodiment of the present embodiment;
27A is a graph of vibration in the optical axis direction of a lens driving device according to the prior art without a damping unit, and FIG. 27B is a graph of vibration in the optical axis direction of the lens driving device according to the present embodiment.

Hereinafter, a preferred embodiment of the present embodiment may be described so that those skilled in the art can easily implement it with reference to the accompanying drawings. In the accompanying drawings, it may be noted that the same reference numbers are used as much as possible when indicating the same configuration in other drawings. In addition, in describing the present embodiment, if it is determined that a detailed description of a related known function or known configuration may unnecessarily obscure the gist of the present embodiment, the detailed description may be omitted. And certain features presented in the drawings are enlarged, reduced, or simplified for ease of explanation, and the drawings and their components are not necessarily drawn to scale. However, those skilled in the art will readily understand these details.

For reference, in FIGS. 1 to 26, an orthogonal coordinate system (x, y, z) may be used. 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. . And, hereinafter, the inner or inner direction or inner portion refers to a direction or portion relatively toward the center of the lens drive device based on the plan view of the lens drive device, and the outer or outer direction or outer portion refers to a plan view of the lens drive device. It may refer to a direction or part relatively away from the center of the lens driving device based on .

1 is a schematic perspective view of a lens driving device 100 according to an embodiment of the present invention, FIG. 2 is a schematic exploded perspective view of the lens driving device 100 according to an embodiment of the present embodiment, and FIG. 1 is a schematic perspective view of the lens driving device 100 with the cover member 300 removed, FIG. 4 is a schematic plan view of FIG. 3, and FIG. 5 is a schematic view of the housing 140 according to one embodiment of this embodiment. 6 is a schematic perspective view of the housing 140 viewed from an angle different from that of FIG. 5, FIG. 7 is a schematic bottom perspective view of the housing 140 according to one embodiment of the present embodiment, and FIG. A schematic exploded perspective view of the housing 140 according to one embodiment of the embodiment, Figure 9 is a schematic plan view of the upper elastic member 150 according to one embodiment of this embodiment, Figure 10 is one embodiment of this embodiment It is a schematic plan view of the lower elastic member 160 according to.

The lens driving device 100 according to the present embodiment is a device that adjusts a distance between a lens and an image sensor in a camera module so that the image sensor is positioned at a focal length of the lens. That is, the lens driving device 100 is a device that performs an auto focusing function.

As shown in FIGS. 1 to 4, the lens driving device 100 according to the present embodiment is provided in the cover member 300, the upper elastic member 150, the bobbin 110, and the bobbin 110. The coil 120, the housing 140, the driving magnet 130 and the printed circuit board 170 provided in the housing 140, the lower elastic member 160, the base 210, and the bobbin 110 It may include a displacement sensor that determines the amount of displacement in the optical axis direction (ie, the first direction) and a damping unit 410 that serves as an attenuator.

The cover member 300 may have a box shape as a whole and be coupled to the upper portion of the base 210 . The cover member 300 includes an upper elastic member 150, a bobbin 110, a coil 120 provided on the bobbin 110, a housing 140, and the housing in an accommodation space formed together with the base 210. The driving magnet 130 and the printed circuit board 170 provided in the 140 can be accommodated.

The cover member 300 may have an opening on an upper surface through which a lens coupled to the bobbin 110 may be exposed to external light. Further, additionally, a window made of a light-transmitting material may be provided in the opening, thereby preventing foreign matter such as dust or moisture from penetrating into the camera module.

The cover member 300 may include a first groove portion 310 at a lower portion. At this time, as will be described later, when the cover member 300 and the base are coupled, the base 210 is located at a portion in contact with the first groove portion 310 (ie, a position corresponding to the first groove portion 310). 2 grooves 211 may be provided. When the cover member 300 and the base are coupled, a concave portion having a predetermined area may be formed through the coupling of the first groove portion 310 and the second groove portion 211 . An adhesive member having a viscosity may be applied to the concave portion. That is, the adhesive member applied to the concave portion fills the gap between the surfaces of the cover member 300 and the base 210 facing each other through the concave portion, so that the cover member 300 is attached to the base 210 While being coupled with, it is possible to seal between the cover member 300 and the base 210, and also, as the cover member and the base are coupled, the side surface can be sealed.

In addition, a third groove 320 may be formed on a surface of the cover member 300 corresponding to the terminal surface of the printed circuit board 170 so as not to interfere with a plurality of terminals formed on the terminal surface. The third groove portion 320 may be concavely formed on the entire surface facing the terminal surface, and the adhesive member is applied to the inside of the third groove portion to form a cover member 300, a base 210, and a printed circuit board ( 170) can be sealed, and side surfaces can be sealed while the cover member and the base are coupled.

Meanwhile, the first groove portion 310 to the third groove portion 320 are formed on the base 210 and the cover member 300, respectively, but are not limited thereto, and are formed only on the base 210 in a similar shape or , It may be configured to be formed only on the cover member 300.

The base 210 may be provided in a rectangular shape as a whole, and may be combined with the cover member 300 to form an accommodation space for the bobbin 110 and the housing 140 .

A stepped portion protruding outward by a predetermined thickness may be provided to surround the lower rim of the base 210 . The predetermined thickness of the stepped portion is the same as the side thickness of the cover member 300, and when the cover member 300 is coupled to the base 210, the side surface of the cover member 300 is the upper portion of the stepped portion. Or it can be seated or contacted or placed or coupled to the side. Due to this, it is possible to guide the cover member 300 coupled to the upper side of the stepped part, and also, the end of the cover member 300 can be coupled so as to be in surface contact, and the end of the cover member faces the bottom or side surface. can include At this time, the stepped portion and the end of the cover member 300 may be adhesively fixed and sealed with an adhesive or the like.

A second groove part 211 may be formed at a position corresponding to the first groove part 310 of the cover member 300 in the stepped part. As described above, the second groove portion 211 may be combined with the first groove portion 310 of the cover member 300 to form a concave portion and form a space filled with an adhesive member.

The base 210 may have an opening near the center. The opening may be formed at a position corresponding to a position of an image sensor disposed in the camera module.

In addition, the base 210 may include four guide members 216 protruding at right angles to a predetermined height in an upward direction from four corner portions. The guide member may have a polygonal columnar shape. The guide member 216 may be inserted into, fastened to, or coupled to a lower guide groove 148 of the housing 140 to be described later. In this way, due to the guide member 216 and the lower guide groove 148, when the housing 140 is seated or placed on the upper part of the base 210, the housing 140 on the base 210 is coupled. The position can be guided, and at the same time, it is possible to prevent the housing 140 from being deviated from the reference position to be mounted due to vibration during the operation of the lens driving device 100 or due to a worker's mistake during the assembly process.

As shown in FIGS. 4 to 9 , the housing 140 may have a hollow column shape as a whole (for example, a hollow rectangular column shape as shown in the drawings). The housing 140 is configured to support at least two or more driving magnets 130 and the printed circuit board 170, and the bobbin 110 therein is movable in a first direction with respect to the housing 140. The bobbin 110 may be accommodated.

The housing 140 may have four flat sides. A side surface of the housing 140 may have an area corresponding to or larger than that of the driving magnet 130 .

As shown in FIG. 9, each of the opposite side surfaces of the four side surfaces 141 of the housing 140 is provided with a through hole 141a or a groove for a magnet in which the driving magnet 130 is seated, placed, or fixed. It can be. The magnet through hole 141a or groove may have a size and shape corresponding to that of the driving magnet 130, and may also have a shape capable of guiding. A first driving magnet 131 and a second driving magnet 132, that is, a total of two driving magnets 130 may be mounted in each of the magnet through holes 141a.

And, among the four side surfaces 141 of the housing 140, one side perpendicular to the both side surfaces or a side other than the both side side surfaces has a through-hole for a sensor into which a position sensor 180 to be described later is inserted or disposed or fixed or seated. (141b) may be provided. The sensor through hole 141b preferably has a size and shape corresponding to the position sensor 180 to be described later. In addition, on the one side, at least one mounting protrusion 149 may be provided to allow the printed circuit board 170 to be mounted or placed or temporarily fixed or fixed. The mounting protrusion 149 is inserted into a mounting through-hole 173 formed in a printed circuit board 170, which will be described later. At this time, the mounting through-hole 173 and the mounting protrusion 149 form a form-fit It may be desirable to be combined in a method or an interference fit method, but may also perform only a simple guide function.

Here, among the four side surfaces 141 of the housing 140, the other side facing the one side may be configured as a flat plane, but is not limited thereto.

As a further embodiment of the housing 140, each of the opposite side surfaces facing each other among the four side surfaces 141 of the housing 140 has through-holes for the first and second magnets in which the driving magnet 130 is seated, placed, or fixed. (141a) (141a') may be provided. In addition, among the four side surfaces 141 of the housing 140, one side perpendicular to the both side surfaces or a side other than the both side surfaces is a third magnet through-hole and a sensor formed by being spaced apart from the third magnet through-hole by a predetermined distance. A through hole 141b may be provided. In addition, among the four side surfaces 141 of the housing 140, a through hole for a fourth magnet may be provided on the other side facing the one side.

That is, four through-holes for magnets and one through-hole 141b for sensors may be provided on the four side surfaces 141 of the housing 140 .

At this time, the through-hole 141a for the first magnet and the through-hole 141a' for the second magnet have the same size and shape, and are (almost) identical over the entire lateral length of the side surface of the housing 140. It has a lateral length. On the other hand, the through-hole for the third magnet and the through-hole for the fourth magnet have the same size and shape, and are larger than the through-hole 141a for the first magnet and the through-hole 141a' for the second magnet. The lateral length may be formed small. This is to secure a space for the through-hole 141b for the sensor since the through-hole 141b for the sensor must be formed on one side where the through-hole for the third magnet is formed.

Naturally, each of the first driving magnets 131 to the fourth driving magnets may be seated, disposed, or fixed to each of the through holes for the first magnet through the through hole for the fourth magnet. At this time, similarly, the first driving magnet 131 and the second driving magnet 132 have the same size and shape, and have substantially the same lateral length over the entire lateral length of the side surface of the housing 140. have The third driving magnet and the fourth driving magnet have the same size and shape, and have a smaller lateral length than the first driving magnet 131 and the second driving magnet 132 . can be formed

Here, preferably, the third magnet through-hole and the fourth magnet through-hole may be disposed symmetrically on a straight line with respect to the center of the housing 140 . That is, the third driving magnet 130 and the fourth driving magnet 130 may be disposed symmetrically on a straight line with respect to the center of the housing 140 . If the third driving magnet 130 and the fourth driving magnet 130 are disposed facing each other while being biased to one side regardless of the center of the housing 140, the coil 120 of the bobbin 110 This is because there is a possibility that the bobbin 110 is tilted because the electromagnetic force acts biasedly on the one side. In other words, the third driving magnet 130 and the fourth driving magnet 130 are arranged symmetrically on a straight line with respect to the center of the housing 140, so that the bobbin 110 and the coil 120 ), it is possible to apply unbiased electromagnetic force to guide the movement of the bobbin 110 in the first direction easily and accurately.

In addition, as shown in FIGS. 3 to 6 and 8 , a plurality of first stoppers 143 may protrude from the upper surface of the housing 140 . The first stopper 143 is to prevent a collision between the cover member 300 and the body of the housing 140, and when an external impact occurs, the upper surface of the housing 140 is directly attached to the upper inner surface of the cover member 300. collision can be avoided. In addition, the first stopper 143 may also serve to guide the installation position of the upper elastic member 150. To this end, as shown in FIG. 9, the first stopper of the upper elastic member 150 A guide groove 155 having a corresponding shape may be formed at a position corresponding to the stopper 143 .

In addition, a plurality of upper frame support protrusions 144 coupled to the outer frame 152 of the upper elastic member 150 may protrude from the upper side of the housing 140 . Meanwhile, as will be described later, a first through hole 152a or a groove having a corresponding shape may be formed in the outer frame 152 of the upper elastic member 150 corresponding to the upper frame support protrusion 144, where It may be fixed with an adhesive or fusion, and the fusion may include thermal fusion or ultrasonic fusion.

In addition, as shown in FIG. 7 , a plurality of lower frame support protrusions 147 coupled to the outer frame 162 of the lower elastic member 160 may protrude from the lower side of the housing 140 . On the other hand, the outer frame 162 of the lower elastic member 160 corresponding to the lower frame support protrusion 147 may be formed with an insertion groove 162a or a hole having a corresponding shape, where adhesive or fusion is used. It may be fixed, and fusion may include thermal fusion or ultrasonic fusion.

The driving magnet 130 may be fixed to the magnet through hole 141a with an adhesive, but is not limited thereto, and an adhesive member such as double-sided tape may be used. Alternatively, as a modified embodiment, a concave-shaped magnet seat may be formed on the inner surface of the housing 140 instead of the through hole 141a for the magnet, and the magnet seat may be formed in a size and shape of the driving magnet 130. It may have a corresponding size and shape.

The driving magnet 130 may be installed at a position corresponding to the coil 120 provided on the bobbin 110 . In addition, the driving magnet 130 may be composed of one body, and in the case of the present embodiment, the side facing the coil 120 of the bobbin 110 may be arranged to have the N pole and the outer side to have the S pole. there is. However, it is not limited thereto, and a converse configuration is also possible. In addition, the driving magnet 130 may be divided into two planes perpendicular to the optical axis.

The driving magnet 130 is composed of a rectangular parallelepiped shape having a certain width, and is seated in the magnet through hole 141a or groove so that the wide surface of the driving magnet 130 is part of the side surface of the housing 140. can form At this time, driving magnets 130 facing each other may be installed parallel to each other. In addition, the driving magnet 130 may be disposed to face the coil 120 of the bobbin 110 . At this time, surfaces of the driving magnet 130 and the coil 120 of the bobbin 110 facing each other may be flatly arranged so as to be parallel to each other. However, it is not limited thereto, and depending on the design, only one of the driving magnet 130 and the coil 120 of the bobbin 110 may be a flat surface, and the other may be a curved surface. Alternatively, the facing surfaces of the coil 120 of the bobbin 110 and the driving magnet 130 may all be curved surfaces, and at this time, the facing surfaces of the coil 120 of the bobbin 110 and the driving magnet 130 The curvature of the surface may be formed to be the same.

As described above, one side of the housing 140 is provided with a through-hole 141b or a groove for a sensor, and a position sensor 180 is inserted, placed, or seated in the through-hole 141b for a sensor, The position detection sensor 180 is electrically coupled to one surface of the printed circuit board 170 by soldering or soldering. In other words, the printed circuit board 170 may be fixed, supported, or disposed on an outer surface of one of the four side surfaces 141 of the housing where the sensor through-hole 141b or groove is provided.

The position sensor 180 may be a displacement sensor that determines a first displacement value of the bobbin 110 in the first direction together with a sensing magnet 190 of the bobbin 110 to be described later. To this end, the position sensor 180 and the sensor through hole 141b or groove may be disposed at a position corresponding to the position of the sensing magnet 190 .

The position detection sensor 180 may be a sensor that detects a change in magnetic force emitted from the sensing magnet 190 of the bobbin 110 . Also, the position detection sensor 180 may be a Hall sensor. However, this is an example, and this embodiment is not limited to the Hall sensor, and any sensor capable of detecting a change in magnetic force can be used, and any sensor capable of detecting a position other than magnetic force can be used. For example, a method using a photo reflector or the like is also possible.

The printed circuit board 170 is coupled to or disposed on one side of the housing 140, and may have a mounting through hole 173 or a groove as described above. Due to this, the installation position of the printed circuit board 170 may be guided by the mounting protrusion 149 provided on one side of the housing 140 .

In addition, the printed circuit board 170 is provided with a plurality of terminals 171, and receives external power to supply current to the coil 120 and the position sensor 180 of the bobbin 110. The number of terminals 171 formed on the printed circuit board 170 may be increased or decreased according to the types of components requiring control. On the other hand, according to this embodiment, the printed circuit board 170 may be provided with FPCB.

The printed circuit board 170 may include a controller that readjusts the amount of current applied to the coil 120 based on the first displacement value sensed by the displacement sensor, that is, the controller controls the printed circuit board It is mounted on (170). In addition, in another embodiment, the control unit may be mounted on a separate board without mounting on the printed circuit board 170, which may be a board on which an image sensor of a camera module is mounted or may be a separate board. .

The actuator driving distance may be further calibrated based on the Hall voltage difference for the change in magnet flux (ie, magnetic flux density) detected by the Hall sensor.

The bobbin 110 may be configured to reciprocate in the first axial direction with respect to the housing 140 fixed in the first axial direction. An auto focusing function may be executed due to movement of the bobbin 110 in the first axial direction.

Regarding the bobbin 110, it may be described in more detail with reference to the drawings below.

Meanwhile, the upper elastic member 150 and the lower elastic member 160 may elastically support an upward and/or downward motion of the bobbin 110 in the optical axis direction. The upper elastic member 150 and the lower elastic member 160 may be provided as leaf springs.

2 to 4, 9 and 10, the upper elastic member 150 and the lower elastic member 160 are coupled to the bobbin 110, the inner frame 151, 161 and the housing 140 ) It may include an outer frame 152, 162 coupled with the inner frame 151, 161 and a connection portion 153, 163 connecting the outer frame 152, 162.

The connecting portions 153 and 163 may be bent at least once to form a pattern having a predetermined shape. The bobbin 110 may be elastically (or elastically) supported when it moves upward and/or downward in the first direction in the optical axis direction through the change in position and fine deformation of the connecting parts 153 and 163.

According to this embodiment, as shown in FIG. 9 , the upper elastic member 150 has a plurality of first through-holes 152a in the outer frame 152 and a plurality of second through-holes in the inner frame 151. (151a) may be provided.

The first through hole 152a is coupled to an upper frame support protrusion 144 provided on the upper surface of the housing 140, and the second through hole 151a or groove is formed on the upper surface of the bobbin 110 to be described later. It may be combined with the provided upper support protrusion. That is, the outer frame 152 is fixed and coupled to the housing 140 through the first through hole 152a, and the inner frame 151 is fixed to the bobbin 110 through the second through hole 151a or groove. and may be combined.

The connection part 153 may connect the inner frame 151 and the outer frame 152 such that the inner frame 151 is elastically deformable in a first direction within a predetermined range with respect to the outer frame 152. . That is, the connection part 153 elastically connects the inner frame 151 fixed or coupled to the upper surface of the bobbin 110 and the outer frame 152 fixed or coupled to the upper surface of the housing 140. , so that the bobbin 110 and the housing 140, which are separated as separate parts, can be elastically connected at the top by the upper elastic member 150.

At least one of the inner frame 151 and the outer frame 152 of the upper elastic member 150 has a terminal portion electrically connected to at least one of the coil 120 of the bobbin 110 and the printed circuit board 170. At least one may be provided.

As shown in FIG. 10, the lower elastic member 160 has a plurality of insertion grooves 162a or holes in the outer frame 162, and a plurality of third through holes 161a or grooves can be provided.

The insertion groove 162a or hole is coupled with the lower frame supporting protrusion 147 provided on the lower surface of the housing 140, and the third through hole 161a or groove is the lower surface of the bobbin 110 to be described later. It can be coupled with the lower support protrusion 114 provided in. That is, the outer frame 162 is fixed and coupled to the housing 140 through the insertion groove 162a or hole, and the inner frame 161 is attached to the bobbin 110 through the third through hole 161a or groove. Can be fixed and combined.

The connecting portion 163 may connect the inner frame 161 and the outer frame 162 such that the inner frame 161 is elastically deformable in a first direction within a predetermined range with respect to the outer frame 162. . That is, the connection part 163 elastically connects the inner frame 161 fixed or coupled to the lower surface of the bobbin 110 and the outer frame 162 fixed or coupled to the lower surface of the housing 140. , and thus, the bobbin 110 and the housing 140, which are separated as separate parts, can be elastically connected at the bottom by the lower elastic member 160.

As shown in FIG. 10 , the lower elastic member 160 may include a first lower elastic member 160a and a second lower elastic member 160b separated from each other. Through this two-part structure, the lower elastic member 160 can receive power of different polarity or different power from each other to the first lower elastic member 160a and the second lower elastic member 160b. That is, after the inner frame 161 and the outer frame 162 are coupled to the bobbin 110 and the housing 140, respectively, the inner frame corresponding to both end lines of the coil 120 disposed on the bobbin 110. By providing a solder part at the position of the solder part, it is possible to receive power of different polarities or different powers by performing a conductive connection such as soldering in the solder part. In addition, the first lower elastic member is electrically connected to one of both end lines of the coil, and the other of the both end lines of the coil and the second lower elastic member are electrically connected to apply current and/or voltage from the outside. can receive

Meanwhile, the upper elastic member 150 and 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, it is possible to finish the fixing work by bonding using an adhesive after fixing by thermal fusion according to the assembly sequence.

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

At least one of the inner frame 161 and the outer frame 162 of the lower elastic member 160 has a terminal portion electrically connected to at least one of the coil 120 of the bobbin 110 and the printed circuit board 170. At least one may be provided.

The damping unit 410 may serve as an attenuator for absorbing vibration in an optical axis direction generated during lens driving of the lens driving device 100 or auto focusing operation. The damping unit 410 is between a stationary body fixed in its original position without moving during the auto focusing operation of the lens driving device 100 and/or a moving body moving in the optical axis direction during the auto focusing operation of the lens driving device 100. can be provided in The fixed body may be, for example, the outer frame of the cover member 300, the housing 140, the base 210, or the upper elastic member 150 and/or the lower elastic member 160, etc., and the mobile body may be the bobbin 110, or a lens, or a coil, or an inner frame of the upper elastic member 150 and/or the lower elastic member 160.

Preferably, as will be described later, the damping unit 410 may be provided between the inner frame of the upper elastic member 150 and/or the lower elastic member 160 and the housing 140 .

At this time, the inner frame and the housing 140 may be provided with a damping connection part 420 to form an accommodation space for accommodating the damping part 410 and/or an attachment area to which the damping part 410 is attached. can That is, the damping connection part 420 is formed of a part of the upper elastic member 150 and/or the lower elastic member 160 and/or a part of the housing 140 .

The damping unit 410 and the damping connection unit 420 according to the present invention may be described in more detail with reference to the drawings below.

Figure 11 is a schematic perspective view of the bobbin 110 according to an embodiment of the present embodiment, Figure 12 is a schematic bottom perspective view of the bobbin 110 according to an embodiment of the present embodiment, Figure 13 is one of the present embodiment A schematic exploded perspective view of the bobbin 110 according to the embodiment, Figure 14 is a partially enlarged perspective view of Figure 13, Figure 15 is a partially enlarged bottom view of Figure 13, Figure 16 is an accommodation according to one embodiment of this embodiment It is a schematic partially enlarged perspective view of the groove 117, and FIG. 17 is a schematic longitudinal cross-sectional view of the bobbin 110 according to one embodiment of the present embodiment.

As shown in FIGS. 11 to 17 , the bobbin 110 may be installed in the inner space of the housing 140 to be reciprocally movable in the optical axis direction. A coil 120, which will be described later, is installed on the outer circumferential surface of the bobbin 110 to enable electromagnetic interaction with the driving magnet 130 of the housing 140, so that the electrons of the coil 120 and the driving magnet 130 The mechanical interaction may cause the bobbin 110 to reciprocate in the first direction. In addition, the bobbin 110 is elastically (or elastically) supported by the upper elastic member 150 and the lower elastic member 160, and moves in the first direction, which is the optical axis direction, to perform an auto focusing function. .

Although not shown, the bobbin 110 may include a lens barrel (not shown) in which at least one lens is installed, but the lens barrel is a component of a camera module to be described later and is an essential component of the lens driving device. may not be an element. The lens barrel can be coupled to the inside of the bobbin 110 in various ways. For example, a female screw thread may be formed on an inner circumferential surface of the bobbin 110 and a male screw thread corresponding to the screw thread may be formed on an outer circumferential surface of the lens barrel, and the lens barrel may be coupled to the bobbin 110 by screwing of the female screw thread. However, this is not limited thereto, and the lens barrel may be directly fixed to the inside of the bobbin 110 by a method other than screw coupling without forming a thread on the inner circumferential surface of the bobbin 110 . Alternatively, the one or more lenses may be integrally formed with the bobbin 110 without a lens barrel. The lens coupled to the lens barrel may be composed of one sheet, or two or more lenses may form an optical system.

In addition, a plurality of upper support protrusions 113 and a plurality of lower support protrusions 114 may protrude from the upper and lower surfaces of the bobbin 110 .

As shown in FIG. 11 , the upper support protrusion may be provided in a cylindrical shape or a prismatic shape, and may couple and fix the inner frame 151 of the upper elastic member 150 and the bobbin 110 . According to the present embodiment, a second through hole 151a or a groove may be formed at a position corresponding to the upper support protrusion of the inner frame 151 of the upper elastic member 150 . In this case, the upper support protrusion and the second through hole 151a or the groove may be fixed by thermal fusion or by an adhesive material such as epoxy. In addition, a plurality of upper support protrusions may be provided. At this time, the distance between each of the upper support protrusions may be appropriately arranged within a range in which interference with neighboring parts can be avoided. That is, each upper support protrusion may be arranged at regular intervals symmetrically with respect to the center of the bobbin 110, and their intervals are not constant, but are symmetrical with respect to a specific imaginary line passing through the center of the bobbin 110. may be formed.

As shown in FIG. 12, the lower support protrusion 114 may be provided in a cylindrical shape or a prismatic shape like the upper support protrusion, and the inner frame 161 and the bobbin 110 of the lower elastic member 160 are provided. Can be combined and fixed. According to this embodiment, a third through hole 161a or a groove may be formed at a position corresponding to the lower support protrusion 114 of the inner frame 161 of the lower elastic member 160 . At this time, the lower support protrusion 114 and the third through hole 161a or groove may be fixed by thermal fusion or by an adhesive material such as epoxy. In addition, a plurality of lower support protrusions 114 as shown in FIG. 12 may be provided. At this time, the distance between each of the lower support protrusions 114 may be appropriately arranged within a range in which interference with neighboring parts can be avoided. That is, each of the lower support protrusions 114 may be arranged at regular intervals symmetrically with respect to the center of the bobbin 110 .

And, on the upper and lower surfaces of the bobbin 110, upper escape grooves 112 and A lower escape groove 118 is formed.

Since the upper escape groove 112 and the lower escape groove 118 are provided, when the bobbin 110 moves in the first direction with respect to the housing 140, the connection parts 153 and 163 and the bobbin 110 The elastic deformation of the connecting parts 153 and 163 may be more easily performed by removing spatial interference. In addition, the location of the upper escape groove may be disposed at the corner of the housing as in the embodiment, but may also be disposed at the side depending on the shape and/or position of the connecting portion of the elastic member.

In addition, the outer circumferential surface of the bobbin 110 may be provided with a seating groove 116 for a coil in which the coil 120 is installed, but only a seating portion may be provided.

The coil 120 may be provided as a ring-shaped coil block inserted into and coupled to the outer circumferential surface of the bobbin 110 or the seating groove 116 for the coil or the seating portion, but is not limited thereto, and the coil 120 It is also possible to directly wind the outer circumferential surface of the bobbin 110 or the seating groove 116 for the coil or the seating portion.

According to this embodiment, the coil 120 may be formed in an approximately octagonal shape as shown in FIG. 13 . This corresponds to the shape of the outer circumferential surface of the bobbin 110, and the bobbin 110 may also be provided in an octagonal shape. In addition, at least four sides of the coil 120 may be provided in straight lines, and corner portions connecting these sides may be formed in round or straight lines. At this time, the portion formed as a straight line may be formed to be a surface corresponding to the driving magnet 130 . Also, a surface of the driving magnet 130 corresponding to the coil 120 may have the same curvature as that of the coil 120 . That is, if the coil 120 is straight, the corresponding side of the driving magnet 130 may be a straight line, and if the coil 120 is curved, the corresponding side of the driving magnet 130 may be curved. and may have the same curvature. Also, even if the coil 120 is curved, the corresponding side of the driving magnet 130 may be straight or vice versa.

The coil 120 is for moving the bobbin 110 in the direction of the optical axis to perform an autofocus function, and when current is supplied, it can form electromagnetic force through electromagnetic interaction with the driving magnet 130. The electromagnetic force may move the bobbin 110.

On the other hand, the coil 120 may be configured to correspond to the driving magnet 130. As shown, the driving magnet 130 is composed of a single body and the entire surface facing the coil 120 has the same polarity. , the coil 120 may also be configured such that a surface corresponding to the driving magnet 130 has the same polarity. On the other hand, although not shown, if the driving magnet 130 is divided into two on a plane perpendicular to the optical axis and the plane facing the coil 120 is divided into two or more, the coil 120 is also divided It is also possible to be divided into a number corresponding to the driving magnet 130 .

Also, the bobbin 110 may include a sensing magnet 190 included in a displacement sensor together with the position sensor 180 of the housing 140 described above. The magnet 190 for sensing may be fixed, arranged, or coupled to the bobbin 110 . Due to this, the sensing magnet 190 may move in the first direction by the same displacement as the bobbin 110 when the bobbin 110 moves in the first direction. In addition, the sensing magnet 190 may be configured as one body, and may be arranged so that the upper direction of the bobbin 110 is the N pole and the lower direction of the bobbin 110 is the S pole. However, it is not limited thereto, and a converse configuration is also possible. In addition, the sensing magnet 190 may be divided into two planes perpendicular to the optical axis.

Here, as shown in FIGS. 13 to 17 , the bobbin 110 may have an accommodation groove 117 for accommodating the sensing magnet 190 on an outer circumferential surface of the bobbin 110 .

The receiving groove 117 may be formed from an outer surface of the bobbin 110 to an inner direction of the bobbin 110 at a predetermined depth.

Specifically, the accommodating groove 117 may be formed on one side of the bobbin 110 such that at least a portion of the accommodating groove 117 is located inside the coil 120 . In addition, at least a portion of the accommodating groove 117 may be formed to be recessed to a predetermined depth in the inner direction of the bobbin 110 more than the seating groove 116 for the coil. In this way, by forming the accommodating groove 117 toward the inside of the bobbin 110, the sensing magnet 190 can be accommodated inside the bobbin 110, and as a result, a separate sensor for the sensing magnet 190 can be accommodated. Since there is no need to secure an installation space, space efficiency of the bobbin 110 can be improved.

In particular, the accommodation groove 117 may be disposed at a position corresponding to the position of the position detection sensor 180 of the housing 140 (or a position opposite to the position detection sensor 180). Due to this, the distance between the sensing magnet 190 and the position sensor 180 is the thickness of the coil 120 and the separation distance between the coil 120 and the position sensor 180, or here the coil and the position sensor Since the distance can be further included and minimized to the distance, the magnetic force detection accuracy of the position sensor 180 can be improved.

The accommodating groove 117 may have an opening 119 communicating with the accommodating groove 117 on one of the lower surface and the upper surface of the bobbin 110 . For example, as shown in FIG. 17, in the receiving groove 117, a part of the lower surface of the bobbin 110 is opened to form an opening 119, and the opening 119 is the receiving groove 117 can form the entrance of A magnet 190 for sensing may be inserted, disposed, or fixed through the opening 119 and separated through the opening 119 .

More specifically, as shown in FIGS. 15 to 17, the receiving groove 117 has an inner surface on which one surface of the sensing magnet 190 is supported, and a predetermined distance from the inner surface so that an adhesive can be injected. It may include an adhesive groove 117b concavely formed deeper inward.

The inner surface is one surface located in an inward direction toward the center of the bobbin 110, and when the sensing magnet 190 has a rectangular parallelepiped shape, the wide surface of the sensing magnet 190 is contacted or seated. am.

The bonding groove 117b may be a groove formed by deeply concave a portion of the inner surface in an inward direction toward the center of the bobbin 110 . Preferably, the bonding groove 117b may be formed from the opening 119 to an inner surface of the bobbin 110 on which one surface of the sensing magnet 190 is in contact with or seated on or disposed.

As shown in FIG. 17, the adhesive groove 117b may further include a first additional groove 117c formed longer than the length of the sensing magnet 190 in the vertical thickness direction of the bobbin 110. can That is, the first additional groove 117c is an extension of the adhesive groove 117b which is formed to be more deeply concave than the inner surface of the bobbin 110 on which the back surface of the sensing magnet 190 is contacted, seated or disposed. am. By providing the first additional groove 117c, when the adhesive is injected into the adhesive groove 117b through the opening 119, the adhesive is filled from the first additional groove 117c to cover the inside of the adhesive groove 117b. Since it is filled, it is possible to prevent the adhesive from overflowing in the bonding groove 117b and flowing to the coil 120 along the gap between the sensing magnet 190 and the receiving groove 117, so the sensing magnet 190 ) It is possible to reduce the defect rate of the lens driving device 100 during the coupling process.

In addition, the bonding groove 117b may further include a second additional groove 117a formed at a predetermined depth in an inward direction from the opening 119 toward the center of the bobbin 110 . That is, the second additional groove 117a may be formed deeper in an inward direction toward the center of the bobbin 110 than the inner surface in the vicinity of the opening 119 . The second additional groove 117a communicates with the bonding groove 117b. In other words, the second additional groove 117a is an extension of the bonding groove 117b. In this way, by providing the second additional groove 117a, since the adhesive can be injected into the bonding groove 117b through the second additional groove 117a, the adhesive overflows near the opening 119 to form a coil ( 120) and other elements of the bobbin 110 can be prevented from being adhered to, thus reducing the rate of defects in the lens driving device 100 during the coupling process of the sensing magnet 190.

Also, as a modified embodiment, the second additional groove 117a may be provided on the bobbin 110 alone without the adhesive groove 117b. In this case, the bobbin 110 and the sensing magnet 190 may be combined and fixed by injecting the adhesive into the second additional groove 117a.

Preferably, the bonding groove 117b may include at least one of the first additional groove 117c and the second additional groove 117a. That is, the bonding groove 117b may include only the first additional groove 117c or only the second additional groove 117a.

As a modified embodiment, in the receiving groove, the depth between the inner surface on which one surface (ie, wide surface) of the sensing magnet is supported and the outer circumferential surface (ie, the surface of the seating groove for coil) provided with the coil is It may be less than or equal to the thickness of the dragon magnet. Due to this, the magnet for sensing may be fixed in the receiving groove by the inner pressing force of the coil due to winding of the coil. In this case, there is no need to use adhesive.

As an additional embodiment, although not shown in the drawing, the bobbin 110 is symmetrical to the receiving groove 117 with respect to the center of the bobbin 110 on the outer circumferential surface facing the outer circumferential surface on which the receiving groove 117 is formed. It may further include an additional accommodation groove 117 formed on the outer circumferential surface of the bobbin 110 at the position, and a weight balance member accommodated in the additional accommodation groove 117.

That is, the additional receiving groove 117 is a bobbin with a predetermined depth at a position symmetrical to the receiving groove 117 in a straight line based on the center of the bobbin 110 on the outer circumferential surface facing the outer circumferential surface where the receiving groove 117 is formed. It may be formed in the inward direction of (110). And, the weight balance member is fixed and coupled in the additional receiving groove 117, and has the same weight as the magnetic force sensing member.

In this way, by providing the additional accommodating groove 117 and the weight balancing member, the weight imbalance in the horizontal direction of the bobbin 110 due to the provision of the accommodating groove 117 and the sensing magnet 190 is reduced by mounting the weight balancing member. can compensate

Preferably, the additional receiving groove 117 may include at least one of the bonding groove 117b, the first additional groove 117c, and the second additional groove 117a.

18 is a schematic partially enlarged perspective view of a damping unit 410 and a damping connection unit 420 according to an embodiment of the present embodiment, and FIG. 19 is a damping unit 410 and damping according to an embodiment of the present embodiment. 20 is a schematic partially enlarged plan view of the connecting portion 420, and FIG. 20 is a schematic partial enlarged view of the damping portion 410 and the connecting portion 420 for damping according to one embodiment of the present embodiment along the line A-A of FIG. It is a longitudinal section.

A plurality of damping units 410 may be provided between the inner frames 151 and 161 of at least one elastic member among the upper elastic member and the lower elastic member and the housing 140 .

That is, as shown in FIGS. 18 to 20 , a plurality of damping units 410 may be provided between the inner frame 151 of the upper elastic member and the housing 140 . Alternatively, although not shown in the drawings, a plurality of damping units 410 may be provided between the inner frame 161 of the lower elastic member and the housing 140 . Alternatively, a plurality of damping units 410 may be provided between the inner frame 151 of the upper elastic member and the housing 140 and in the inner frame 161 of the lower elastic member and the housing 140, respectively. there is.

Hereinafter, in order to avoid duplication of description, as shown in the drawing, the damping part 410 is provided between the inner frame 151 of the upper elastic member and the housing 140. Based on the case where a plurality of so that it can be described.

The damping unit 410 may serve to damp vibration in the first direction (ie, the optical axis direction) caused by electromagnetic interaction between the driving magnet 130 and the coil 120 .

The damping part 410 may be provided on the bobbin 110 and the housing 140 so that the bobbin 110 can move within a predetermined range in the first direction with respect to the housing 140 .

To this end, the damping part 410 may be made of a photocurable resin. Preferably, the damping part 410 may be made of UV curable resin, and more preferably, the damping part 410 may be made of UV curable silicone or damping silicone or a damping member.

In order to allow the bobbin 110 to flow in the optical axis direction within a predetermined range without being completely fixed with respect to the housing 140 by the damping part 410, the damping part 410 is a semi-cured gel ) may be provided.

Here, the semi-curing process of the damping unit 410 is performed by irradiating the space between the inner frame 151 and the housing 140 (that is, the space provided with the damping unit 410 and the damping unit 410) to light (or UV). ) or by exposure to heat for a period of time.

Also, a plurality of damping units 410 may be provided between the housing 140 and the inner frame 151 . In this case, preferably, the plurality of damping parts 410 may be spaced apart from each other at the same angle in the circumferential direction of the housing 140 and the inner frame 151 . This is because vibration in the optical axis direction generated by the movement of the bobbin 110 during the auto focusing operation of the lens driving device 100 is uniformly absorbed around the bobbin 110, so that the vibration in the optical axis direction of the bobbin 110 is moved in one direction. This is to avoid bias.

In addition, preferably, when the plurality of damping parts 410 are provided in an even number, the plurality of damping parts 410 are paired or paired with each other between the inner frame 151 and the housing 140. They may be placed oppositely.

The inner frame 151 and the housing 140 may include a connecting portion 420 for damping. In other words, the damping connection part 420 may be composed of a part of the inner frame 151 and a part of the housing 140 .

The damping connection part 420 may limit the accommodation space of the damping part 410 . In addition, the damping connection part 420 may be configured to increase the attachment area of the damping part 410 in order to increase the damping area of the damping part 410 .

In addition, the damping connection part 420 may be configured such that the damping part 410 can be safely accommodated and fixed between the inner frame 151 and the housing 140 . This is because the damping part 410 is in a liquid or semi-liquid state before going through a semi-curing process, so when the damping part 410 is injected between the inner frame 151 and the housing 140, the damping part 410 is in the inner frame ( 151) and the housing 140 because it is difficult to maintain in a certain position.

The damping connecting portion 420 may be configured such that a portion of the inner frame 151 and a portion of the housing 140 spatially overlap within a predetermined range based on a plan view of the lens driving device 100 .

Specifically, the damping connection part 420 may include a damping extension 421 provided on the inner frame 151 and a damping receiving groove 423 provided on the housing 140. .

The damping extension 421 and the damping receiving groove may be disposed to face each other between the inner frame 151 and the housing 140 .

A plurality of damping extensions 421 may be provided on opposite surfaces of the inner frame 151 where the inner frame 151 and the housing 140 face each other. Specifically, the inner frame 151 of the upper elastic member and the housing 140 have opposing surfaces facing each other, and the opposing surface belonging to the inner frame 151 is a first opposing surface, and the housing 140 When the opposing surface belonging to ) is referred to as the second opposing surface, the damping extension 421 extends from the first opposing surface in the outward direction (ie, the housing 140 as shown in FIGS. 18 to 21). ) towards the inner surface of) may extend in the horizontal direction by a predetermined length.

Preferably, the damping extension 421 may have a plate-like member shape as a whole.

The damping extension 421 may have a predetermined thickness. Preferably, the predetermined thickness of the damping extension 421 may be the same as that of the upper elastic member.

Also, the damping extension 421 may extend on the same horizontal plane as that of the upper elastic member.

In addition, a part of the damping extension 421 may be disposed in the damping receiving groove 423 . At this time, the extension part 421 for damping may have a lower surface of a part of the extension part 421 for damping disposed at a predetermined height from the bottom part 423a of the receiving groove 423 for damping.

In addition, according to this embodiment, the damping extension 421 may include at least one perforation 421a. The perforation part 421a may be formed to pass through the extension part 421 for damping in the thickness direction. Here, the perforation part 421a may serve to increase an exposure area for a part of the damping part 410 disposed under the extension part 421 for damping. In this way, by providing the perforation part 421a, the time required for the semi-curing process for making the damping part 410 into a semi-curing gel state can be significantly saved, and as a result, the overall manufacturing time of the lens driving device is reduced. can do.

At this time, according to the present embodiment, as shown in FIG. 18, the perforated part 421a may have a shape cut so that a part of the free end of the extension part 421 for damping is opened outward. . In this case, preferably, the incised shape may be semicircular. However, this is an example and the present embodiment is not limited to this shape.

In addition, according to the present embodiment, the extension for damping 421 may include lateral extensions 421b extending toward both sides of the free end of the extension for damping 421. The lateral extension part 421b may extend toward both side surfaces of the damping receiving groove 423 in a horizontal direction.

At this time, preferably, the lateral extension portion 421b has opposite surfaces in which both sides of the lateral extension portion 421b and the receiving groove 423 for damping or the side partition wall portion 430 to be described later face each other They may be arranged spaced apart at predetermined intervals.

Preferably, the outer frame 152 may have a bent part bent outward or a cutout part 425 cut outward at a position corresponding to the position of the damping accommodating groove 423 . This is because the damping extension 421 of the inner frame 151 and the outer frame 152 are located on the same horizontal plane, and a part of the damping extension 421 must be accommodated in the damping receiving groove 423. Therefore, this is to remove spatial interference between a part of the damping extension 421 and the outer frame 152.

The damping accommodating groove 423 may be provided in plurality at a position corresponding to the position of the damping extension 421 on the second opposite surface of the housing 140 .

The damping accommodating groove 423 may be concavely formed to accommodate a part of the damping extension 421 and the damping part 410 on the second facing surface. That is, the receiving groove 423 for damping may be concavely formed in an outward direction away from the center of the housing 140 on the second facing surface of the housing 140 .

In this way, by providing the receiving groove 423 for damping, when the damping part 410 in a liquid state before being semi-cured is filled between the inner frame 151 and the housing 140, the position of the damping part 410 can be adjusted. In addition to stabilization, the amount of material used as the damping part 410 can be adjusted and supplied to correspond to the volume of the receiving groove 423 for damping, thereby minimizing the amount of material used as the damping part 410 can do.

Also, the damping receiving groove 423 has a predetermined width (ie, left and right lengths in the horizontal direction) and a predetermined height or depth (ie, top and bottom lengths in the vertical direction). At this time, the damping accommodating groove 423 is such that the predetermined width of the damping accommodating groove 423 is greater than the width of the damping extension 421 and the damping accommodating groove 423 has a predetermined height. may be configured to be greater than a predetermined thickness of the damping extension 421 .

That is, the damping receiving groove 423 may be formed at a predetermined depth from the upper surface of the housing 140 at a position corresponding to the position of the damping extension 421 in the housing 140 .

In other words, the damping accommodating groove 423 and the damping extension 421 have a predetermined distance between the opposing surfaces where the damping accommodating groove 423 and the damping extension 421 face each other. It may be provided on the bobbin 110 and the housing 140 so as to be spaced apart from each other. In addition, the damping part 410 may be provided, attached, or filled in a receiving space in which the damping accommodating groove 423 and the damping extension 421 are separated from each other by a predetermined distance from each other.

The damping receiving groove 423 may have a bottom portion 423a limited to an inner surface of the housing 140 . For example, when the receiving groove 423 for damping is provided in the lower portion of the housing 140, the stepped portion 423a is formed on the lower surface of the housing 140 and among the inner surfaces of the housing 140. can be formed in parallel. To the same effect, when the receiving groove 423 for damping is provided on the upper part of the housing 140, the stepped part 423a is the upper surface of the housing 140 and the upper surface of the inner surface of the housing 140. can be formed in parallel. Due to the stepped portion 423a, the damping portion 410 before the semi-curing process can be maintained at a certain position within the receiving groove 423 for damping of the housing 140, thereby reducing the position of the damping portion 410 can be stably maintained at a desired position by the operator, thereby facilitating the final forming process (ie, semi-hardening process) of the damping part 410.

Here, according to the present embodiment, as shown in FIG. 18, the bottom portion 423a of the damping accommodating groove 423 may be inclined downward. In this case, preferably, the bottom portion 423a may be configured such that both sides of the bottom portion 423a are concavely inclined at a uniform angle with the center line of the bottom portion 423a as the lowest point. Due to this, when the damping part 410 is filled or injected into the damping receiving groove 423, the damping part has a sufficient amount at the lower part of the center of the damping extension part 421 where the damping action should be concentrated. 410 can be filled, and at the same time, the damping unit 410 can be more stably maintained in a certain position even before the semi-hardening process is performed. And, as described above, since the perforated part 421a is formed at the free end of the extension part 421 for damping, the lower part of the perforated part 421a (that is, the upper part of the center line of the receiving groove 423 for damping) Even if the amount of the damping part 410 is relatively large in ), since light is supplied through the perforation part 421a, the semi-hardening process can be uniformly performed over the entire damping part 410.

In addition, the damping part 410 may be attached to or accommodated in the damping receiving groove 423 so as to surround the entire outer surface of a part of the damping extension part 421 with a predetermined thickness. That is, the damping part 410 includes the upper and lower surfaces, the front surface, and both sides of a part of the extension part 421 for damping accommodated in the receiving groove 423 for damping, and the bottom part of the receiving groove 423 for damping. (423a) and both side surfaces and the opposite surface of the front surface of the damping extension 421 may be provided to surround all.

In addition, the housing 140 may include side partition wall portions 430 protruding in a right angle direction from the upper surface of the housing 140 on both sides of the damping receiving groove 423 . In this way, by providing the side bulkhead portion 430, when the damping portion 410 is injected or filled into the damping receiving groove 423, the damping portion 410 overlies both sides of the damping receiving groove 423. Flow (overflow) to other parts in the lens driving device can be prevented.

Hereinafter, additional embodiments of various shapes of the damping extension 421 may be described in detail.

21 is a schematic, partially enlarged plan view of the damping extension 421 according to the first additional embodiment of the present embodiment, and FIG. 22 is a damping extension 421 according to the second additional embodiment of the present embodiment. 23 is a schematic partially enlarged plan view of the damping extension 421 according to the third additional embodiment of the present embodiment, and FIG. 24 is a schematic partial enlarged plan view according to the fourth additional embodiment of the present embodiment. It is a schematic partial enlarged plan view of the extension part 421 for damping.

The foregoing perforations 421a and the lateral extensions 421b may be used in the same configuration with the same terminology below.

As shown in FIG. 21, according to the first additional embodiment of this embodiment, the extension for damping 421 extends in the direction of both sides of the free end of the extension for damping 421. It may include an extension part 421b and one perforation part 421a.

Here, the perforation part 421a may be provided in a closed shape in the extension part 421 for damping. For example, the perforated part 421a may be provided in a circular shape within the extension part 421 for damping.

As shown in FIG. 22, according to the second additional embodiment of this embodiment, the extension for damping 421 extends in the direction of both sides of the free end of the extension for damping 421. It may include an extension part 421b and a plurality of perforations 421a.

Here, the perforation part 421a may have a smaller diameter than the diameter of the perforation part 421a according to the first additional embodiment, and may be provided in plurality in the extension part 421 for damping. Also, the plurality of perforations 421a may be provided in a closed shape in the extension part 421 for damping. For example, the perforated part 421a may be provided in a circular shape within the extension part 421 for damping.

For this reason, according to the present embodiment, since the exposure area for a portion located under the damping extension 421 among the damping parts 410 can be increased, The time required for the exposure process can be considerably saved.

As a modified embodiment, a portion of the plurality of perforations 421a is provided in a circular shape within the damping extension 421, and a portion of the plurality of perforations 421a is the damping extension 421 ) It may be provided in a semicircular shape at the free end of.

In addition, the lateral extension part 421b may include at least one perforation part 421a. Due to this, the exposure area for a portion located under the damping extension 421 can be further increased.

Of course, at least one perforation 421a provided in the lateral extension 421b may be additionally provided in the lateral extension 421b of the damping extension 421 shown in FIGS. 18 and 19 there is.

As shown in FIGS. 23 and 24 , according to the third additional embodiment and the fourth additional embodiment of this embodiment, the damping extension 421 may include one perforated part 421a. At this time, in the present embodiments, the damping extension 421 does not include a lateral extension 421b.

Also, the perforated part 421a according to the third additional embodiment of this embodiment shown in FIG. 23 may be provided in the damping extension 421 in a closed shape. In this case, the closed shape may be circular.

In addition, the perforation part 421a according to the fourth additional embodiment of the present embodiment shown in FIG. 24 may have a cut shape such that a part of the free end of the extension part 421 for damping is opened outward. . At this time, the incised shape may be semicircular.

25 is a schematic longitudinal cross-sectional view of a receiving groove 423 for damping according to a further embodiment of the present embodiment.

The receiving groove 423 for damping according to an additional embodiment of the present embodiment shown in FIG. 25 may include all of the components and technical features of the receiving groove 423 for damping according to the present embodiment described above.

And, as shown in FIG. 25, the damping accommodating groove 423 according to the additional embodiment of the present embodiment has a predetermined vertical direction from the bottom portion 423a of the damping accommodating groove 423 on the second opposite surface side. An inner barrier rib portion 423c protruding high may be provided.

In this case, preferably, a predetermined height of the inner partition wall portion 423c may be smaller than a height between the lower surface of the extension portion 421 for damping and the bottom portion 423a. This is because the bobbin 110 elastically reciprocates in the first direction when the lens driving device performs an auto-focusing operation, so that the damping extension 421 and the inner This is to remove spatial interference with the partition wall portion 423c.

That is, the damping receiving groove 423 is limited by the bottom portion 423a, side partition walls 430 provided on both sides, the inner surface of the housing 140, and the inner partition wall portion 423c It can be.

By having the inner bulkhead portion 423c, when the damping portion 410 is injected or filled into the damping receiving groove 423, the damping portion 410 moves inward from the damping receiving groove 423 ( That is, overflow (in the direction toward the bobbin 110) can be prevented from flowing to other parts in the lens driving device, and the damping unit 410 can be more stably fixed and maintained in place.

26 is a schematic plan view and a partially enlarged view of a damping unit 410 and a damping connection unit 420 according to another embodiment of the present embodiment.

The damping unit 410 and the damping connection unit 420 according to another embodiment of the present embodiment of FIG. 26 have the configuration and All technical features are included, but the location may be different.

As shown in FIG. 26, the damping unit 410 according to another embodiment of the present embodiment is connected to at least one elastic member of the upper elastic member and the lower elastic member 153, 163 and the housing 140 ) may be provided between them.

Specifically, the connecting portion 153 (163) is formed by bending at least once between the inner frame 151 (161) and the outer frame 152 (162) so as to be elastically deformable in a first direction. A pattern of shapes may be provided. Preferably, the connecting portion may be configured to have an 'S' shape repeated at least once or more in outline or as a whole.

The damping connection part 420 according to this embodiment may be provided in plurality at a position corresponding to the position of the damping part 410 . The damping connection part 420 is made up of a part of the connection part of the upper elastic member and a part of the housing 140 .

Specifically, the extension part 421 for damping may extend toward the housing 140 from an outer surface of a pattern having a predetermined shape provided on the connection part 153 . That is, the extension part 421 for damping is bent at least once to form an outward direction from the outer surface of the outermost bent part of the pattern in the connection part 153 having a pattern of a certain shape (ie, the housing 140) towards) can be extended horizontally.

The receiving groove 423 for damping may be provided at a position corresponding to the extension for damping. That is, the damping receiving groove 423 may be disposed to face the damping extension 421 in the housing 140 .

Also, the damping extension 421 may be concave to accommodate a part of the damping extension 421 and the damping portion 410 .

The extension for damping 421 and the receiving groove 423 for damping according to this embodiment are the extension for damping 421 according to one embodiment of the present embodiment described above with reference to FIGS. 18 to 25 and for damping Components and technical features of the receiving groove 423 may be included as they are.

27A is a graph of vibration in the optical axis direction of the lens driving device according to the prior art without a damping unit 410, and FIG. 27B is a graph of vibration in the optical axis direction of the lens driving device according to the present embodiment.

When the damping unit 410 for the auto focusing operation of the lens driving device 100 is not provided as in the prior art, the result of the vibration experiment during the auto focusing operation of the lens driving device 100 shown in FIG. 27A is shown in the graph. As shown, it can be confirmed that a resonance point or a resonance section (refer to the red circular mark) where the amplitude is maximized occurs.

Unlike this, in the case of having the damping unit 410 for the auto focusing operation of the lens driving device 100 as in the present embodiment, the result of the vibration test during the auto focusing operation of the lens driving device 100 shown in FIG. 27B As shown in the graph, it can be confirmed that the resonance point or resonance section shown in the result graph is removed in the vibration test during the auto focusing operation of the lens driving device 100 shown in FIG. 27A.

As described above, in the present embodiment, vibration of the bobbin in the optical axis direction during auto focusing may be damped by including a damping unit between the housing and at least one of the upper elastic member and the lower elastic member. Due to this, the present embodiment can remove a resonance phenomenon in the optical axis direction of the lens driving device during auto focusing. As a result, the present embodiment can prevent damage or breakage of the upper elastic member and/or the lower elastic member connecting the bobbin and the housing.

In addition, the present embodiment can increase the damping area of the damping unit by providing a coupling part for damping that increases the attachment area of the damping unit between the bobbin and the housing, thereby more efficiently removing the resonance phenomenon during auto focusing. It is possible to improve the attachment stability of the damping unit between the bobbin and the housing.

In addition, the camera module may further include a camera module control unit, and the first displacement value calculated based on the current change value detected by the displacement detection unit is compared with the focal length of the lens according to the distance between the subject and the lens. can Thereafter, the camera module control unit readjusts the amount of current applied to the coil 120 of the bobbin 110 when the first displacement value or the current position of the lens and the focal length of the lens do not correspond to each other, so that the bobbin 110 may be moved by a second displacement amount in the first direction. In addition, the displacement detection unit is configured for the sensing according to the first direction movement of the sensing magnet 190 fixedly coupled to the bobbin 110, which is a movable position sensor 180 fixedly coupled to the housing 140, which is a fixed body. The current position of the bobbin 110 or the first displacement amount in a separate driver IC or the camera module control unit based on the current change amount output based on the detected change amount of magnetic force by detecting the change in magnetic force emitted from the magnet 190. can be calculated or judged. The current position or the first displacement amount of the bobbin 110 calculated or determined by the displacement sensor is transmitted to the control unit of the printed circuit board 170, and the control unit re-determines the position of the bobbin 110 for auto focusing to coil ( 120) can be adjusted.

Although illustrated and described as a specific embodiment to illustrate the technical idea of the present embodiment above, this embodiment is not limited to the same configuration and operation as the specific embodiment as described above, and various modifications do not deviate from the scope of the present embodiment. can be carried out within Accordingly, such modifications should be regarded as belonging to the scope of the present embodiment, and the scope of the present embodiment may be determined by the claims described later.

100: lens driving device
110: bobbin
120: coil
130: driving magnet
140: housing
150: upper elastic member
160: lower elastic member
170: printed circuit board
180: position detection sensor
190: magnet for sensing
210: base
300: cover member
410: damping unit
420: connection for damping
421: extension for damping
423: receiving groove for damping
430: side bulkhead

Claims (20)

housing;
a bobbin disposed within the housing and movable in a direction parallel to the optical axis;
an elastic member coupled to the bobbin and the housing; and
A damping unit coupled to the elastic member and the housing;
The elastic member includes an inner frame coupled to an upper portion of the bobbin, an outer frame coupled to an upper portion of the housing, a connecting portion connecting the inner frame and the outer frame, and an extension protruding from the connecting portion,
The connecting portion includes a first end connected to the inner frame, a second end connected to the outer frame, and an intermediate portion connecting the first end and the second end,
The extension part extends from the middle part, and the damping part contacts the extension part and the housing;
The damping part overlaps the extension part in a direction parallel to the optical axis and does not overlap the connection part. According to claim 1,
The damping unit is disposed closer to the outer frame than to the inner frame. According to claim 1,
The extension portion extends in a horizontal direction from the intermediate portion toward the housing. According to claim 1,
The bobbin includes a first support protrusion coupled to the inner frame,
The housing includes a second support protrusion coupled to the outer frame,
The damping unit is disposed closer to the second support protrusion than to the first support protrusion. According to claim 1,
the extension,
a third end connected to the intermediate portion; and
a fourth end opposite the third end;
The damping unit is bonded to the fourth end of the extension unit and the housing. According to claim 5,
The fourth end of the extension part is positioned closer to the outer frame than to the inner frame. According to claim 5,
A length of the extension from the third end of the extension to the fourth end of the extension is shorter than a length of the link from the first end to the second end of the link. According to claim 1,
The lens driving device having a shape in which the connecting portion is bent at least once. According to claim 1,
The extension part is spaced apart from the inner frame and the outer frame. According to claim 1,
The damping unit is a lens driving device formed of UV curable silicone. According to claim 5,
The fourth end of the extension includes a hole,
A part of the damping part is disposed between the hole of the extension part and the housing. According to claim 5,
The housing includes a receiving groove corresponding to the fourth end of the extension,
A part of the damping part is disposed between the fourth end of the extension part and the receiving groove of the housing. According to claim 1,
The connection part includes four connection parts corresponding to the four corners of the housing and spaced apart from each other,
The extension part includes four extension parts corresponding to the four connection parts,
The damping part includes four damping parts corresponding to the four extension parts,
Each of the four damping parts is bonded to a corresponding one of the four extension parts. According to claim 1,
a magnet disposed in the housing; and
A coil disposed on the bobbin and moving the bobbin in a direction parallel to the optical axis by interaction with the magnet,
The lens driving device of claim 1 , wherein the damping unit absorbs vibration generated by movement of the bobbin. According to claim 14,
a sensing magnet disposed on the bobbin; and
A lens driving device including a position sensor corresponding to the sensing magnet and disposed in the housing. housing;
a bobbin disposed within the housing;
a magnet disposed in the housing;
an elastic member coupled to the bobbin and the housing; and
A damping unit coupled to the elastic member and the housing;
The elastic member includes an inner frame coupled to an upper portion of the bobbin, an outer frame coupled to an upper portion of the housing, a connecting portion connecting the inner frame and the outer frame, and an extension protruding from the connecting portion,
The damping part is in contact with a part of the extension part and the housing,
When viewed from above, the extension is disposed between the inner frame and the outer frame and is spaced apart from the inner frame and the outer frame;
The damping part overlaps the extension part in a direction parallel to the optical axis and does not overlap the connection part. According to claim 16,
When viewed from above, the damping unit is disposed closer to the outer frame than to the inner frame. According to claim 16,
When viewed from above, the damping unit is disposed between the connection unit and the outer frame. housing;
a bobbin disposed within the housing and movable in a direction parallel to the optical axis;
an elastic member coupled to the bobbin and the housing; and
A damping unit coupled to the elastic member and the housing;
The elastic member includes an inner frame coupled to an upper portion of the bobbin, an outer frame coupled to an upper portion of the housing, a connecting portion connecting the inner frame and the outer frame, and an extension protruding from the connecting portion,
The damping portion overlaps the extension portion in a direction parallel to the optical axis and does not overlap the connection portion;
The lens driving apparatus of claim 1 , wherein the housing includes an accommodating groove corresponding to the extension part and in which a part of the damping part is disposed. lens;
a lens driving device according to any one of claims 1 to 19; and
A camera module including an image sensor.

Images