KR20160089703A - Lens moving unit and camera module having the same - Google Patents

Abstract

According to an embodiment of the present invention, a lens driver comprises: a first lens driving unit; a second lens driving unit moving the first lens driving unit in second and third directions orthogonal to an optical axis and different from each other; a sensing unit sensing the movement of a bobbin in a direction of the bobbin parallel to the optical axis; upper and lower elastic members elastically supporting the raising and lowering operations of the bobbin; a damping member disposed on an upper surface of the bobbin; and first support units respectively provided on the bobbin and the upper elastic member to maintain a disposition of the damping member.

Description

[0001] The present invention relates to a lens driving apparatus and a camera module having the lens driving unit.

The present embodiment relates to a lens driving apparatus and a camera module having the lens driving apparatus.

The camera module includes a printed circuit board on which an image sensor for transmitting electrical signals to the image sensor is mounted, an infrared cut filter for blocking light in the infrared region of the image sensor, and at least one or more lenses As shown in FIG. At this time, the optical system may be provided with a lens driving device capable of performing auto focus function and camera shake correction function.

The lens driving device can be variously configured, and a voice coil unit motor is generally used. The voice coil unit motor can operate by the electromagnetic interaction of the coil unit wound on the outer circumferential surface of the bobbin to which the magnet fixed to the housing and the lens barrel are coupled to perform the auto focusing function. The voice coil motor type actuator module can be reciprocated in a direction parallel to the optical axis while the bobbin moving up and down is elastically supported by the lower and upper elastic members.

When the auto focus of the camera module and the camera shake correction are performed, a problem may arise in controlling the lens driving device according to the vibration frequency of the elastic member.

In this way, the lens driving device needs a means for controlling the oscillation of the driver, and if it is excessive, the setting time becomes slow, and the auto focusing speed may be lowered.

The present embodiment provides a lens driving apparatus having an auto focusing and camera shake correcting function capable of accurately receiving position information of a bobbin and a holder member, and a camera module having the lens driving apparatus.

The lens driving apparatus according to the present embodiment includes a bobbin having at least one lens disposed on the inner side and an outer circumferential surface provided with a first coil and a holder member for supporting a magnet disposed around the bobbin, A first lens driving unit for moving the bobbin and the first coil in a first direction parallel to the optical axis by a first coil interaction; And a base which is spaced apart from the bobbin and the first lens driving unit by a predetermined distance, and a second lens driving unit which supports the first lens driving unit movably in the second and third directions with respect to the base, A second coil disposed opposite to the magnet of the first lens driving unit and a detection sensor for detecting a position of the second lens driving unit in the second and third directions with respect to the base, A second lens driving unit having a circuit board and moving the entire first lens driving unit including the bobbin by a mutual action of the magnet and the second coil, in a second and third directions orthogonal to the optical axis and in different second and third directions; A sensing unit for sensing movement in a direction parallel to an optical axis of the bobbin; An upper and a lower elastic member having one end connected to the bobbin and the other end coupled to the holder member to elastically support the upward and downward movement of the bobbin; A damping member disposed on an upper surface of the bobbin; And a first support unit provided on each of the bobbin and the upper elastic member so as to maintain an arrangement position of the damping member.

The first support unit may include a first support unit formed on the bobbin. And a second support portion which is not in interference with the first support portion and is formed at a position corresponding to the first support portion of the upper elastic member so as to surround the periphery of the first support portion.

The first support portion may be disposed at the center of the second support portion, and the damping member may be disposed to be concentric with the first and second support portions.

The first support portion may be disposed at the center of the second support portion, the second support portion may be provided in an arc shape having one side opened, and the damping member may be disposed concentrically with the first and second support portions.

Alternatively, the first supporting unit may include a first supporting part formed on the upper side of the bobbin; And a second support portion which is not interfered with the first support portion and is formed at a position corresponding to the first support portion of the upper elastic member so as to pass through a groove formed at the center of the first support portion.

Alternatively, the first support unit may include a first support unit formed on the bobbin, the first support unit being spaced apart from the bobbin by a pair of different members. And a second support portion which is not in interference with the first support portion and is formed at a position corresponding to the first support portion of the upper elastic member so as to pass through a gap formed between the first support portions, Can be bent at least twice.

The sensing unit may include: a second magnet disposed on an outer circumferential surface of the bobbin; And a position sensor disposed on the side wall of the cover member and on an inner surface facing the second magnet.

The position sensor may be a hall sensor, and the circuit board may be provided with a plurality of terminals exposed to the outside.

The first supporting unit may be disposed at a distance from the joining portion of the upper elastic member and the bobbin.

According to another embodiment, the apparatus may further include a second support unit disposed at a predetermined distance from the first support unit and disposed on the bobbin.

Here, the second supporting unit may include a third supporting part formed on the upper side of the holder member; And a fourth support portion which is not interfered with the third support portion and is formed at a position corresponding to the third support portion of the upper elastic member so as to surround the periphery of the third support portion, And the second support unit.

The second support unit may be disposed between the first support unit, the upper elastic member, and the fixed portion of the holder member.

According to another embodiment of the present invention, there is provided a bobbin according to any one of the first to third aspects, wherein the third supporting unit is provided on each of the bobbin and the upper elastic member so as to maintain the position of the damping member, ; And a sixth support portion which is not interfered with the fifth support portion and is formed at a position corresponding to the fifth support portion of the upper elastic member so as to surround the periphery of the fifth support portion, 5 can be bent so as to cover the support at least twice.

The camera module according to the present embodiment includes an image sensor; A printed circuit board on which the image sensor is mounted; And at least one of the first and second lens driving devices configured as described above.

According to the present embodiment as described above, the damper can be applied between the elastic member and the fixed portion of the holder member or between the bobbin and the elastic member so that the amount of damper of the damping member can be easily adjusted, .

Further, since the gain is suppressed by the addition of the damping member or the Q value is lowered, the phase change becomes gentler, so that when the change of the gain at the resonance frequency is abrupt, the phase change also abruptly occurs and the instability of the feedback control is increased It is possible to reduce the peak of the resonance frequency and suppress the second, third and fourth resonance frequencies.

Further, by applying the damping member between a part of the connecting part of the elastic member and the fixed part of the holder member or the elastic member, the connection part of the elastic member can be bent more than once to moderate the change with respect to frequency.

1 is a schematic perspective view of a camera module according to the present embodiment,
Fig. 2 is an exploded perspective view of Fig. 1,
3 is an enlarged perspective view of the bobbin of FIG. 2,
Fig. 4 is an enlarged perspective view of the holder member of Fig. 2,
FIG. 5 is a plan view showing a state of engagement between the upper elastic member and the bobbin and the shape of the damping member according to the first embodiment,
6 is a plan view showing a state of engagement between the upper elastic member and the bobbin and the shape of the damping member according to the second embodiment,
FIG. 7 is a plan view showing a state of engagement between the upper elastic member and the bobbin and the shape of the damping member according to the third embodiment,
Figures 8-11 schematically illustrate possible configurations of the damping member and the support unit,
12 is a graph showing the rate of change of the resonance frequency gain before and after the application of the damping member according to the present embodiment.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

Fig. 1 is a perspective view schematically showing a camera module according to the embodiment, Fig. 2 is an exploded perspective view of Fig. 1, Fig. 3 is an enlarged perspective view of the bobbin of Fig. FIG. 5 is a plan view showing a state of engagement between the upper elastic member and the bobbin and a shape of the damping member according to the first embodiment, FIG. 6 is a plan view showing the state of engagement between the upper elastic member and the bobbin according to the second embodiment, Fig. 7 is a plan view showing the state of engagement of the upper elastic member and the bobbin and the shape of the damping member according to the third embodiment, Figs. 8 to 11 show possible configurations of the damping member and the support unit And FIG. 12 is a graph showing the rate of change of the resonance frequency gain before and after the application of the damping member according to the present embodiment.

As shown in FIGS. 1 and 2, the lens driving apparatus according to the present embodiment may include a first lens driving unit 1 and a second lens driving unit 2. At this time, the first lens driving unit 1 is an autofocus lens driving unit and the second lens driving unit 2 is a shake correction lens driving unit.

The first lens driving unit 1 may include a base 20, a bobbin 30, and a holder member 40. The cover member 60 may further include a holder member 40 for forming an outer frame of the camera module and supporting a magnet 41 to be described later.

The base 20 can be engaged with the cover member 60.

The bobbin (30) can be installed in the inner space of the cover member (60) so as to reciprocate in the optical axis direction. The bobbin (30) may be provided with a first coil (31) on a coil receiving portion (30a) formed on the outer circumferential surface.

The upper and lower elastic members 51 and 52 may be installed on the upper and lower bobbins 30, respectively. The upper elastic member 51 may be connected at one end to the bobbin 30 and at the other end to the holder member 40. However, it is not limited thereto and may be coupled to the cover member 60 if necessary. And may be coupled to the upper or lower surface of the holder member 40 when coupled to the holder member 40. The lower elastic member 52 may be connected at one end to the bobbin 30 and at the other end to the upper surface of the base 20 or the lower surface of the holder member 40. A protrusion for coupling the lower elastic member 52 may be formed on the lower side of the base 20 and a hole or a recess may be formed at a corresponding position of the lower elastic member 52, The lower elastic member 52 can be fixed by the coupling and the rotation can be prevented. Further, an adhesive or the like may be added for firm fixing, or the protrusion and the elastic member may be joined by heat welding or the like.

2, the upper elastic member 51 is formed of two leaf springs in a two-divided structure, and the lower elastic member 52 is formed as a single body, serving as a terminal for receiving a current can do. That is, the current applied through the terminal 21b is transmitted through the two springs of the upper elastic member 52, and this current can be applied to the first coil 31 wound on the bobbin 30. For this purpose, the upper elastic member 51 and the first coil 31 may be connected to each other by soldering or the like. The upper elastic member 51 includes an outer portion coupled with the holder member 40, a medial portion coupled with the bobbin 30, and a connection portion connecting the medial portion and the outer portion. And may be electrically connected to both ends through soldering or the like. That is, both ends of the two springs and the first coil 31 may be electrically connected to each other by soldering, Ag epoxy, welding, conductive epoxy, or the like. However, it is not limited thereto, and conversely, the lower elastic member 52 may be formed in this divided structure, and the upper elastic member 51 may be integrally formed. Alternatively, the upper elastic member 51 may be divided into four or more parts.

By the upper and lower elastic members 51 and 52, the bobbin 30 can be flexibly supported in both directions in the direction of the optical axis. That is, the bobbin 30 is separated from the holder member 40 by a predetermined distance, and can be controlled to move upward and downward about the initial position of the bobbin 30. The initial position of the bobbin 30 may be contacted at the lower portion of the holder member 40 so that the bobbin 30 may be controlled to move upward only about the initial position of the bobbin 30. [

The first coil 31 may be a ring-shaped coil block coupled to an outer circumferential surface of the bobbin 30. However, the present invention is not limited thereto, and the coil may be directly wound on the outer peripheral surface of the bobbin 30. 2, the first coil 31 may be installed at a position close to the lower surface of the bobbin 30 and may include a straight surface and a curved surface depending on the shape of the bobbin 30. [ have.

Or the first coil 31 formed of a coil block may have various shapes and may have an octagonal shape. That is, all of them can be formed as straight lines without curved surfaces. This is because the electromagnetic action with the magnet 41 disposed to face each other is considered. This is because when the corresponding surface of the magnet 41 is flat, the electromagnetic force can be maximized when the surface of the first coil 31 facing the surface is flat. However, the present invention is not limited to this, and the surface of the magnet 41 and the surface of the first coil 31 may be all curved surfaces, all flat, or one curved surface and one flat surface according to design specifications.

The bobbin 30 has a first surface formed to be flat on a surface corresponding to the straight surface and a second surface formed on the surface corresponding to the curved surface so as to be rounded to be coupled to the outer circumferential surface of the first coil 31. [ The second surface may also be a flat surface.

The holder member 40 may be formed of a substantially hexahedral frame. The upper and lower surfaces of the holder member 40 may be provided with coupling structures for coupling the upper and lower elastic members 51 and 52, respectively, and a magnet 41 may be installed at four corners or four sides . At this time, as shown in FIG. 2, a seating part (not shown) may be formed at a position where the magnet 41 is installed. However, the present invention is not limited thereto, and the magnet 41 may be directly bonded and fixed to the inner circumferential surface of the holder member 40 without the seating portion. When the magnet 41 is directly fixed to the holder member 40 as described above, the magnet 41 may be directly bonded and fixed to the side or edge of the holder member 40.

Further, unlike the embodiment, when the lens driving device is constituted by only the auto focusing unit other than the camera shake correcting unit, there can be only the cover member 60 without the separate holder member 40. [ The cover member 60 may be formed of a metal material, which is a ferromagnetic material such as iron. In addition, the cover member 60 may be formed in an angular shape as viewed from above so as to cover the bobbin 30 in its entirety. At this time, the cover member 60 may have a rectangular shape as shown in FIGS. 1 and 2, or may have an octagonal shape, though not shown. When the shape of the magnet 41 disposed at the edge of the holder member 40 is trapezoidal as viewed from above when the cover member 60 is viewed from above and the shape of the holder member 40 is trapezoidal, The magnetic field can be minimized.

Meanwhile, the lens driving apparatus according to the present embodiment may be provided with a sensing unit for sensing the movement of the bobbin 30.

The sensing unit may include a sensing magnet (100) and a first position sensing sensor (300). Here, the first position detecting sensor 300 may be installed in the holder member 40.

The sensing magnet 100 may be smaller and thinner than the magnet 41, and may be formed as a vertically polarized rectangle as shown in FIG. However, the present invention is not limited thereto, and it may be configured in various shapes such as a square, a triangle, a polygon, and a circle.

The sensing magnet 100 may be installed on the outer circumferential surface of the bobbin 30. According to the present embodiment, the sensing magnet 100 may be fixed to the sensing magnet mounting portion 30b provided on the bobbin 30 with an adhesive or the like. At this time, the sensing magnet mounting portion 30b may be formed as a groove formed concavely from the outer circumferential surface of the bobbin 30, but the present invention is not limited thereto, .

The concave depth of the sensing magnet mounting portion 30b may correspond to the thickness of the sensing magnet 100, or may be set to be low or high. In addition, when the sensing magnet 100 is fixed to the sensing magnet mounting portion 30b with an adhesive or the like, the sensing magnet 100 may not protrude from the outside of the guide.

Also, the sensing magnet 100 may be disposed at a position not interfering with the first coil 31. That is, when the first coil 31 is provided below the bobbin 30 as shown in FIG. 3, the sensing magnet 100 may be disposed above the bobbin 30, or vice versa. This is to prevent the first coil 31 from affecting the upward / downward movement of the bobbin 30 in the optical axis direction. However, the sensing magnet 100 may be disposed between the first coil 31 and the bobbin 30 or may be disposed between the first coil 31 and the cover member 60 or the holder member 40, Or may be disposed on the upper surface.

The sensing magnet 100 may be disposed so as not to face the magnet 41, as shown in FIGS. That is, if two or four magnets 41 are installed in the inner corner of the holder member 40, the sensing magnet 100 is not moved in the direction of the magnet 41, As shown in FIG. The reason why the sensing magnet 100 is disposed so as not to face the magnet 41 is to prevent the change in the magnetic force of the sensing magnet 100 from interfering with the magnetic force of the magnet 41, 300 can accurately feed back the motion of the bobbin 30. In addition, the sensing magnet 100 may be disposed on the upper or lower surface of the magnet 41 without facing the magnet 41. [

The sensing magnet 100 may be vertically polarized so that the first sensing sensor 300 senses the upward and downward movement of the sensing magnet 100 and moves the bobbin 30 up and down Can be grasped accurately.

The first position detection sensor 300 is connected to the circuit board 21 so as to be energized to output a position detection signal of the bobbin 30. However, the present invention is not limited thereto, and it is also possible to dispose another substrate or the like on the side wall of the holder member 40 so as to be energized.

As shown in FIG. 4, the first position detecting sensor 300 may be inserted into a position detecting sensor seating part 45 formed on the outer circumferential surface of the holder member 40. At this time, the inside of the side wall on which the seating portion 45 is formed is formed with a recess so that the thickness of the holder member 40 can be minimized at the seating portion 45. Accordingly, the distance between the first position sensing sensor 300 and the sensing magnet 100 can be minimized, and the movement of the bobbin 30 can be detected more accurately.

2, a correction magnet 200 may be additionally provided on the opposite side of the surface of the bobbin 30 on which the sensing magnet 100 is installed, but this is optional.

The correction magnet 200 may be provided on the outer circumferential surface of the bobbin 30 and may be fixed to a correction magnet mounting portion (not shown) provided on the bobbin 30 with an adhesive or the like. In this case, the correction magnet mounting portion may be formed as a groove formed concavely from the outer circumferential surface of the bobbin 30, but the present invention is not limited thereto, and the seating portion in which the correction magnet 200 can be disposed may be formed in a rib shape or the like have. The correction magnet mounting portion may have the same shape as that of the sensing magnet mounting portion, and the depth of the concave groove may correspond to the thickness of the correction magnet 200, or may be formed to be low or high. Therefore, when the correction magnet 200 is fixed to the correction magnet mounting portion with an adhesive or the like, the correction magnet 200 may not protrude or protrude outside the guide.

The sensing magnets 100 and the correction magnets 200 may be provided in the same size. In addition, the centers of the sensing magnet 100 and the correction magnet 200 may be aligned with each other. That is, a virtual extension line connecting the center of the sensing magnet 100 and the center of the correction magnet 200 may be arranged to pass through the center of the bobbin 30. The attraction force generated between the sensing magnet 100 and the correction magnet 200 and the cover member 60 is canceled each other so that the center of the bobbin 30 is not pulled toward the cover member 60. Therefore, the bobbin 30 can be disposed near the center where the attracting force between the sensing magnet 100 and the correction magnet 200 and the cover member 60 is balanced, without being shifted toward the cover member 60, It is possible to move the center of the bobbin 30 and the optical axis in alignment.

Although the sensing magnet 100 and the correction magnet 200 are disposed so as to face the flat straight surface side of the cover member 60, the sensing magnet 100 and the correction magnet 200 are not limited thereto. For example, the sensing magnet 100 and the correction magnet 200 may be arranged so as to face the corner side of the cover member 60. In this case, the first position detecting sensor 300 may be disposed at a corner of the cover member 60 corresponding to the sensing magnet 100. In this case, the magnet 41 may be disposed on the side surface of the holder member 40.

In another embodiment, the first position detecting sensor 300 is disposed on the bobbin, the sensing magnet 100 is disposed on the holder member 40, or the magnet 41 and the sensing magnet 100 are shared The sensing magnet 100 may be omitted.

The support member 42 supports the movement of the holder member 40 for correcting the shaking motion and may be formed of a leaf spring or a suspension wire or the like. Further, when the magnet 41 is disposed at the edge of the holder member 40, the support member 42 can be disposed on the side of the holder member 40, or vice versa.

The first lens driving unit 1 may be configured as described above, and may be replaced with an optical system that implements another type of auto focusing function in addition to the above configuration. That is, instead of using an auto focusing actuator of the voice coil motor type, it is also possible to use an optical module using a single lens moving actuator or an actuator of a variable index type. That is, the first lens driving unit 1 can be any optical actuator capable of performing the auto focusing function.

2 and 5, the second lens driving unit 2 includes a first lens driving unit 1, a base 20, a supporting member 42, 1 circuit board 21, a second coil 23, and a second position sensing sensor 21a. In another embodiment, the second circuit board 22 may be further included so that the second coil 23 is disposed on the second circuit board 22. [

In the embodiment, the first circuit board 21 may be provided with a control element for driving the lens driving device, and the patterned second coil 23 may be formed on the second circuit board 22. The first and second circuit boards 21 and 22 may be electrically connected to each other and the second circuit board 22 may be stacked on the first circuit board 21. However, the present invention is not limited thereto, and the first circuit board 21 and the second circuit board 22 may be omitted. In this case, the second coil 23 may be assembled to the first circuit board 21 as an individual component. The first circuit board 21 may be an FPCB as shown in FIG. 2, and may be installed on the upper surface of the base 20.

The second circuit board 22 may be stacked on the upper surface of the first circuit board 21 and closely contacted with the first circuit board 21 as shown in FIG.

The second coil 23 can move the entire first lens driving unit 1 in the plane direction perpendicular to the optical axis through the interaction with the magnet 41. [ The second coil 23 may be formed on the second circuit board 22 in a pattern coil manner as shown in FIG. 2. The second coil 23 is a position corresponding to the bottom surface of the magnet 41, (22).

The second position sensor 21a may be installed on the first circuit board 21 as shown in FIG. 2, but not limited thereto. The second position sensor 21a may be disposed as a separate component, As shown in Fig. The second position sensing sensor 21a detects the magnetic field of the magnet 41 and senses the movement of the holder member 40 in the direction perpendicular to the optical axis.

As in the present embodiment, a lens driving device capable of simultaneously performing camera shake correction and autofocusing is provided with a bobbin 30 and a holder member 40, which are movable parts for autofocusing, A damping member 400 may be provided for gain and / or phase adjustment to the frequency. The damping member 400 may be disposed on the upper surface of the bobbin 30 according to the present embodiment. have. To this end, the first support unit 1000 may include a first support portion 1100 and a second support portion 1200, as shown in FIG. A separate damping member 400 is provided between the support member 42 and the holder member 40 for adjusting the gain and / or phase of the control unit during operation of the support member 42 and the holder member 40 for the purpose of camera- Can be installed.

The first support part 1100 may be integrally formed on the upper side of the bobbin 30 and may be formed in a protruding shape. The second support portion 1200 may be formed at a position corresponding to the first support portion 1100 of the upper elastic member 51 so as to surround the first support portion 1100. The second support portion 1200 may be formed at a part of the connection portion of the upper elastic member 51.

The first and second supporting portions 1100 and 1200 may be formed in various shapes, but the present invention is not limited to the embodiments shown in Figs. 8 to 11, The second support portion 1200 can be applied to any structure.

8, the first supporting part 1100 is protruded from the center, and the second supporting part 1200 includes the first supporting part 1100 so that the first supporting part 1100 can be disposed at the center, As shown in FIG. At this time, the second support part 1200 may be provided in a ring shape. The first and second supporting portions 1100 and 1200 may be coaxially disposed, and the damping member 400 may be applied to the center of the first and second supporting portions 1100 and 1200, respectively.

Alternatively, unlike the above embodiment, the second support part 1200 may have an opening at one side. 9, the second support part 1200 may be integrally formed with the upper elastic member 51 and may be formed in an arc shape not interfering with the first support part 1100, It is the same that the damping member 400 is applied in a correspondingly arranged state.

Alternatively, as shown in FIG. 10, the first support part 1100 may be formed as a pair of protruding protruding members, and they may be spaced apart to form a groove. The second support part 1200 may be provided in a straight line and may be arranged to pass through the groove. The damping member 400 may be applied to contact both the first and second supports 1100 and 1200.

Alternatively, as shown in FIG. 11, the first support part 1100 may be formed of a pair of protruding protrusions, and they may be spaced apart from each other by a predetermined distance, but may be staggered so as not to face each other to form a L- have. The second support part 1200 is provided at least twice in a bent shape and can be arranged to pass through the gap. The damping member 400 may be applied to contact both the first and second supports 1100 and 1200.

5, the first support unit 1000 configured as described above includes a fixing protrusion 33 protruding from the bobbin 30 and fixed to one end of the upper elastic member 51, As shown in FIG. That is, the position where the upper elastic member 51 is fixed and the position where the damping member 400 is applied / arranged may be different from each other. The first support unit 1000 and the fixing protrusions 33 may be disposed on the same surface of the bobbin 30. For example, when the bobbin 30 is an octagonal overall including eight surfaces, the fixing protrusions 33 and the first supporting unit 1000 may be disposed on the side walls forming the four surfaces, respectively, As shown in FIG.

6, a second support unit 2000 may be further included in addition to the first support unit 1000 or may be configured as a second support unit 2000 without the first support unit 1000. [ You may. At this time, the second support unit 2000 is disposed between the fixing part fixing the upper elastic member 51 to the holder member 40 side and the fixing protrusion 33, and the upper part of the holder member 40 Plane. ≪ / RTI > Also, the first support unit 1000 and the second support unit 2000 may be spaced apart from each other by a predetermined distance. For example, when the bobbin 30 is provided in an octagonal shape, the first supporting unit 1000 may be disposed on four wall surfaces together with the fixing protrusions 33, 1 support unit 1000 may not be disposed. At this time, the damping member 400 applied to the first and second support units 1000 and 2000 may be configured in the same manner.

According to the present embodiment, the second support unit 2000 may include a third support portion 2100 and a fourth support portion 2200.

The third support portion 2100 may protrude from the upper side of the holder member 40 and may be disposed at a position spaced apart from the first support portion 1100 (see FIG. 5) . The third support portion 2100 guides the arrangement position of the damping member 400 together with the first support portion 1100 and is connected to the fourth support portion 2200 by the applied damping member 400, And also to fix the member 51 to the holder member 40 side.

The fourth support portion 2200 may be integrally formed with the upper elastic member 51 and may be configured to surround the third support portion 2100 as shown in FIG. The fourth support portion 2200 may have various shapes. For example, as shown in FIG. 6, the third support portion 2100 may be wound in an arc shape. However, the fourth support portion 2100 is not limited thereto, And the second support portion 1200 shown in FIG. 11, as shown in FIG.

The second support unit 2000 configured as described above is provided on the upper side of the holder member 40 and is fixed to the first support unit 1000 and the upper elastic member 51 and the holder member 40 And can be placed between the governments. However, the bobbin 30 may be spaced apart from the outer circumferential surface of the bobbin 30 by a predetermined distance so as to prevent interference with the bobbin 30 when the bobbin 30 moves up and down.

According to this configuration, since the damping member 400 is disposed on the bobbin 30 side via the first support unit 1000 and / or on the holder member 40 side via the second support unit 2000 At least one or both of the bobbin 30 and the holder member 40 can be coated with the damping member 400 so that the product reliability can be improved and the shape of the upper elastic member 51 can be simplified.

On the other hand, as shown in FIG. 7, the third support unit 3000 may be alternatively or parallelly installed at the position of the first support unit 1000 or the position of the second support unit. That is, only the third support unit 3000 may be configured without the first and second support units 1000 and 2000, or only one of the first, second, and third support units 1000, 2000, Two, or a combination of both. The third support unit 3000 may include a fifth support portion 3100 and a sixth support portion 3200.

The fifth support portion 3100 protrudes from the upper surface of the bobbin 30 or the upper surface of the holder member 40 and may be constructed in the same manner as the first support portion 1100 (see FIG. 5). The fifth support portion 3100 may protrude from the upper surface of the bobbin 30 or the upper surface of the holder member 40 in a protruding shape and may be connected to the upper elastic member 51 through the damping member 400 .

The sixth support portion 3200 is integrally formed with the upper elastic member 51 and may be formed so as to cover the fifth support portion 3100 at least twice as shown in FIG. That is, one end of the upper elastic member 51 is fixed to the fixing protrusion 33 integrally protruded from the bobbin 30, and the other end is fixed to the holder member 40 side. At this time, The elastic member 51 can arrange the configuration of the sixth support portion 3200 bent in an arc shape in a superposed manner. For example, when the bobbin 30 has an octagonal shape, two fixing protrusions 33 protrude from opposite ends of the bobbin 30, and the fifth supporting portion 3100, A total of four fifth support portions 3100 may be formed to protrude from the surface on which the first support portion 3100 is formed. However, it is not limited thereto, and it may be used together with the first support unit 1000 described above, or may be used together with both the first and second support units 1000 and 2000.

As described above, when the damping member 400 is applied through the first to third supporting units 1000 to 3000, the amount by which the damping member 400 is extended compared with the conventional lens driving distance is reduced by half or more, Thereby minimizing the damage of the semiconductor device 400.

Since the damping member 400 is applied to the connecting portion of the bobbin 30 and the upper elastic member 51 through the first supporting unit 1000 instead of applying the gap therebetween during the application process of the damping member 400, It is possible to prevent the damping member 400 from penetrating into other parts such as the inside of the bobbin 30. [

The height of the first, third and fifth support portions 1100, 2100 and 3100 formed in the bobbin 30 is equal to or higher than the height of the upper elastic member 51, It is possible to minimize the flow and the driving distance of the light source 400.

In addition, the spring leg of the upper elastic member 51 can be formed to be thick in the width direction and to be long in the longitudinal direction, so that the primary frequency is kept similar to the conventional case, It can move after 300Hz to make control more easily.

The damping member 400 is applied between the fixed portion of the upper elastic member 51 and the fixed portion of the holder member 40 or between the fixed position of the bobbin 30 and the upper elastic member 51, The amount of the product can be easily adjusted, and the productivity and workability of the product can be improved.

Further, since the gain is suppressed or the Q value is lowered through the addition of the damping member 400, the phase change becomes gentle, so that when the change of the gain at the resonance frequency is abrupt, It is possible to reduce the peak of the resonance frequency and to suppress the second, third and fourth resonance frequencies.

The connecting portion 51 of the upper elastic member is bent at least once through application of the damping member 400 between a part of the connecting portion of the upper elastic member 51 and the fixing portion of the holder member or the upper elastic member 51 The change to the frequency can be made gentle.

Meanwhile, the lens driving apparatus having the sensing magnet 100 and the correction magnet 200 constructed as shown in FIGS. 1 to 4 can perform unidirectional control and bidirectional control. That is, the base 20 and the bobbin 30 can be closely arranged in the initial position. For example, a stopper may be formed on the holder member 40 side to form an initial position in contact with the bottom surface of the bobbin 30, and on the contrary, It is possible that the stopper is disposed in contact with the upper surface of the base 20. The upper and lower elastic members 51 and 52 may be formed such that the initial position of the bobbin 30 is in close contact with the base 20 in a state where a preload of a predetermined size is added, When the power is applied, the bobbin 30 is raised by electromagnetic interaction, and when the power is cut off, the upper and lower elastic members 51 and 52 can return to the initial position by the restoring force of the upper and lower elastic members 51 and 52.

Alternatively, the base 20 and the bobbin 30 may be disposed at a predetermined distance from the initial position. In this case, the upper and lower elastic members 51 and 52 may be formed in a flat state in which a preload is not applied, but may be formed in a state in which a predetermined preload is applied. In this case, if the bobbin 30 is separated from the base 20 in an initial state, when the power is applied, depending on the polarity of the applied current, for example, when the constant current is applied, If the reverse current is applied, it may be lowered based on the initial position.

In this way, the position of the bobbin 30 can be confirmed more accurately by using the sensing magnet 100 in the present embodiment to carry out the autofocusing function by controlling the bobbin 30 to be elevated, Can be minimized. Particularly, since the calibrating magnet 200 disposed at the position opposite to the sensing magnet 100 cancels the attractive force between the sensing magnet 100 and the cover member 60, the bobbin 30 is maximally coaxial with the cover member 60 So that it can be moved while maintaining the state.

The camera module may include a lens driving device configured as described above, a lens barrel coupled to the bobbin 30, an image sensor 11, and a printed circuit board 10. At this time, the printed circuit board 10 is mounted on the image sensor 11 and can form the bottom surface of the camera module.

The bobbin 30 may include a lens barrel in which at least one lens is installed. The lens barrel may be screwed into the bobbin 30. However, the present invention is not limited thereto, and although not shown, it is also possible that the lens barrel is directly fixed to the inside of the bobbin 30 by a method other than screwing, or the one or more lenses are formed integrally with the bobbin . The lens may be composed of a single sheet, or two or more lenses may be configured to form an optical system

The base 20 may further include an infrared cut filter at a position corresponding to the image sensor 11 and may be coupled to the holder member 40. Further, the lower side of the holder member 40 can be supported. The base 20 may be provided with a separate terminal member for powering the printed circuit board 10, or may be formed integrally with a surface electrode or the like. The base 20 may function as a sensor holder for protecting the image sensor 11. In this case, a protrusion may be formed downward along the side surface of the base 20. [ However, this is not essential, and although not shown, a separate sensor holder may be disposed below the base 20 to perform its role.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. Therefore, the true scope of protection of the present embodiment should be defined by the following claims.

10; A printed circuit board 11; Image sensor
20; Base 21; The first circuit board
22; A second circuit board 30; Bobbin
31; A coil unit 40; The holder member
51; A top elastic member 52; The lower elastic member
60; A cover member 100; Sensing magnet
200; Correction magnet 300; The first position detection sensor
400; Damping member 1000; The first support unit
1100; A first support portion 1200; The second support
2000; A second support unit 2100; The third support
2200; A fourth support portion 3000; The third support unit
3100; Fifth support portion 3200; The sixth support

Claims (14)

A bobbin having at least one or more lenses disposed on the inner side thereof and having a first coil disposed on an outer circumferential surface thereof and a holder member for supporting a magnet disposed around the bobbin, A first lens driving unit for moving the bobbin and the first coil in a first direction parallel to the optical axis; And
A first lens driving unit for supporting the first lens driving unit movably in the second and third directions with respect to the base, and a second lens driving unit for supplying power to the first coil driving unit And a sensing circuit for sensing a position of the second lens driving unit relative to the base in the second and third directions, wherein the second coil is disposed on a side opposite to the magnet of the first lens driving unit, A second lens driving unit having a substrate and moving the entire first lens driving unit including the bobbin by the interaction of the magnet and the second coil, in a second and third directions perpendicular to the optical axis and in different second and third directions;
A sensing unit for sensing movement in a direction parallel to an optical axis of the bobbin;
An upper and a lower elastic member having one end connected to the bobbin and the other end coupled to the holder member to elastically support the upward and downward movement of the bobbin;
A damping member disposed on an upper surface of the bobbin; And
And a first support unit provided on each of the bobbin and the upper elastic member so as to maintain an arrangement position of the damping member.
The apparatus of claim 1, wherein the first support unit comprises:
A first support formed on the bobbin; And
And a second support portion which is not interfered with the first support portion and is formed at a position corresponding to the first support portion of the upper elastic member so as to surround the periphery of the first support portion.
3. The method of claim 2,
The first support portion is disposed at the center of the second support portion,
Wherein the damping member is disposed so as to be concentric with the first and second support portions.
3. The method of claim 2,
The first support portion is disposed at the center of the second support portion,
The second support portion is provided in an arc shape having one side opened,
Wherein the damping member is disposed so as to be concentric with the first and second support portions.
The apparatus of claim 1, wherein the first support unit comprises:
A first support formed on the bobbin; And
And a second support portion which is not in interference with the first support portion and is formed at a position corresponding to the first support portion of the upper elastic member so as to pass through a groove formed at the center of the first support portion.
The apparatus of claim 1, wherein the first support unit comprises:
A first supporter formed on the bobbin and spaced apart from the bobbin by a pair of different members; And
And a second support portion which is not in interference with the first support portion and is formed at a position corresponding to the first support portion of the upper elastic member so as to pass through a gap formed between the first support portions,
And the second support portion is bent at least twice.
The apparatus of claim 1,
A second magnet installed on an outer circumferential surface of the bobbin; And
And a position sensing sensor disposed on the side wall of the cover member and on an inner surface facing the second magnet.
8. The method of claim 7,
Wherein the position sensor is a hall sensor,
Wherein the circuit board is provided with a plurality of terminals exposed to the outside.
The apparatus of claim 1, wherein the first support unit comprises:
And the upper elastic member and the bobbin are spaced apart from each other by a predetermined distance.
The method according to claim 1,
And a second support unit disposed at a predetermined distance from the first support unit and disposed on the bobbin.
11. The image forming apparatus according to claim 10,
A third support formed on the holder member; And
And a fourth support portion which is not interfered with the third support portion and is formed at a position corresponding to the third support portion of the upper elastic member so as to surround the periphery of the third support portion,
Wherein the damping member is applied to both the first and second support units.
11. The image forming apparatus according to claim 10,
And the second elastic member is disposed between the first support unit, the upper elastic member, and the fixed portion of the holder member.
11. The method of claim 10,
And a third support unit provided on each of the bobbin and the upper elastic member so as to maintain an arrangement position of the damping member,
The third support unit includes:
A fifth supporter formed on the bobbin; And
And a sixth support portion which is not interfered with the fifth support portion and is formed at a position corresponding to the fifth support portion of the upper elastic member so as to surround the periphery of the fifth support portion,
And the sixth support portion is bent so as to surround the fifth support portion at least twice.
Image sensor;
A printed circuit board on which the image sensor is mounted; And
A camera module comprising at least one of the first and second lens driving devices according to any one of claims 1 to 13.

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