KR20230112595A - Lens moving unit and camera module having the same - Google Patents

Abstract

A lens driving device according to the present embodiment includes a first lens driving unit; and a second lens driving unit for moving the entire first lens driving unit in second and third directions orthogonal to the optical axis and different from each other. a sensing unit sensing movement of the bobbin in a direction parallel to an optical axis; upper and lower elastic members having one end connected to the bobbin and the other end coupled to the holder member to elastically support lifting and lowering 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 to maintain the arrangement position of the damping member.

Description

Lens driving unit and camera module having the same {Lens moving unit and camera module having the same}

This embodiment relates to a lens driving device and a camera module having the same.

The camera module may include an optical system composed of a printed circuit board on which an image sensor and an image sensor for transmitting electrical signals are mounted, an infrared cut-off filter for blocking light in the infrared region to the image sensor, and at least one lens for transmitting an image to the image sensor. At this time, a lens driving device capable of performing an auto focusing function and a hand shake correction function may be installed in the optical system.

The lens driving device can be configured in various ways, and a voice coil unit motor is generally used. The voice coil unit motor may perform an auto-focusing function by operating by electromagnetic interaction between a magnet fixed to the housing and a coil unit wound on an outer circumferential surface of a bobbin coupled with a lens barrel. In such a voice coil motor type actuator module, a bobbin that moves up and down can be reciprocally moved in a direction parallel to an optical axis while being elastically supported by lower and upper elastic members.

When auto-focusing and hand-shake correction of the camera module, a problem may occur in controlling the lens driving device according to the vibration frequency of the elastic member.

As such, the lens driving device requires a means for controlling the oscillation of the driver, and if excessive, the setting time becomes slow, which may cause a problem of lowering the auto focusing speed.

(Patent Document 1) KR 10-2014-0140329 A

The present embodiment provides a lens driving device having an auto-focusing and hand-shake correction function capable of accurately receiving feedback on positional information of a bobbin and a holder member, and a camera module having the same.

A lens driving device according to the present embodiment includes a bobbin on which at least one lens is installed on an inner side and a first coil is installed on an outer circumferential surface of the bobbin, and a holder member supporting a magnet disposed around the bobbin, wherein the first lens driving unit moves the bobbin and the first coil in a first direction parallel to an optical axis by interaction between the magnet and the first coil; and a base spaced apart from the bobbin and the first lens driving unit by a predetermined distance, a supporting member capable of supporting the first lens driving unit movably in second and third directions with respect to the base and supplying power to the first coil, a second coil disposed to face the magnet of the first lens driving unit, and a sensor detecting positions of the second lens driving unit relative to the base in second and third directions. a second lens driving unit having a substrate and moving the entire first lens driving unit including the bobbin in second and third directions perpendicular to the optical axis and different from each other by interaction between the magnet and the second coil; a sensing unit sensing movement of the bobbin in a direction parallel to an optical axis; upper and lower elastic members having one end connected to the bobbin and the other end coupled to the holder member to elastically support lifting and lowering 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 to maintain the arrangement position of the damping member.

The first support unit includes a first support part formed on an upper side of the bobbin; and a second support portion that does not interfere 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 circumference of the first support portion.

The first support part may be disposed at the center of the second support part, and the damping member may be disposed concentrically with the first and second support parts.

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

Alternatively, the first support unit may include a first support part formed on an upper side of the bobbin; and a second support portion that does not interfere 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 is formed on the upper side of the bobbin, the first support portion provided as a pair of different members and spaced apart from each other by a predetermined distance; And a second support portion that does not interfere 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. The second support portion may be bent at least twice.

The sensing unit includes a second magnet installed on an outer circumferential surface of the bobbin; and a position sensor disposed on a sidewall of the cover member and on an inner surface facing the second magnet.

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

The first support unit may be spaced apart from a coupling portion between the upper elastic member and the bobbin by a predetermined distance.

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

At this time, the second support unit includes a third support formed on the upper side of the holder member; And a fourth support portion formed at a position corresponding to the third support portion of the upper elastic member so as to surround the circumference of the third support portion and not interfere with the third support portion. The damping member may be applied to both the first and second support units.

Also, the second support unit may be disposed between the first support unit, the upper elastic member, and the fixing part of the holder member.

According to another embodiment, a third support unit provided on each of the bobbin and the upper elastic member to maintain the disposition position of the damping member, wherein the third support unit includes a fifth support formed on an upper side of the bobbin; And a sixth support that does not interfere with the fifth support and is formed at a position corresponding to the fifth support of the upper elastic member so as to surround the circumference of the fifth support. The sixth support may be bent to surround the fifth 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 constructed as described above.

According to the present embodiment as described above, a damper is applied between the fixing part of the elastic member and the holder member or between the bobbin and the elastic member so that the damper amount of the damping member can be easily adjusted, thereby improving product distribution and workability.

In addition, since the gain is suppressed through the addition of a damping member or the Q value is lowered, the phase change is gradual, so that when the gain change is rapid at the resonance frequency, the phase change also occurs rapidly, which can improve the instability of feedback control, reduce the peak of the resonance frequency, and suppress the 2nd, 3rd, and 4th order resonance frequencies.

In addition, by applying a damping member between a portion of the connection portion of the elastic member and the holder member or the fixing portion of the elastic member, the change in frequency can be moderated by bending the connection portion of the elastic member more than once.

1 is a schematic perspective view of a camera module according to this embodiment;
Figure 2 is an exploded perspective view of Figure 1;
3 is an enlarged perspective view of the bobbin of FIG. 2;
4 is an enlarged perspective view of the holder member of FIG. 2;
5 is a plan view showing a coupled state of an upper elastic member and a bobbin and a shape of a damping member according to a first embodiment;
6 is a plan view showing a coupled state of an upper elastic member and a bobbin and a shape of a damping member according to a second embodiment;
7 is a plan view showing a coupled state of an upper elastic member and a bobbin and a shape of a damping member according to a third embodiment;
Figures 8 to 11 are views schematically showing possible configurations of the damping member and the support unit according to, and,
12 is a graph showing the resonant frequency gain change rate before and after applying the damping member according to the present embodiment.

Hereinafter, any one of the “magnet 41”, “sensing magnet 100”, and “calibration magnet 200” may be referred to as a “first magnet,” the other referred to as a “second magnet,” and the other referred to as a “third magnet.” Hereinafter, one of the “first support 1100”, “second support 1200”, “third support 2100”, “fourth support 2200”, “5th support 3100” and “6th support 3200” is referred to as “first support”, the other is referred to as “second support”, and the other is referred to as “third support”. One may be referred to as a “fourth support”, another “fifth support”, and the other “sixth support”.

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

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, FIG. 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. 7 is a plan view showing the coupled state of the bobbin and the shape of the damping member, FIG. 7 is a plan view showing the coupled state of the upper elastic member and the bobbin and the shape of the damping member according to the third embodiment, FIGS. 8 to 11 are views schematically showing possible configurations of the damping member and the support unit according to the third embodiment, and FIG.

As shown in FIGS. 1 and 2 , the lens driving device 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 a lens driving unit for auto focus, and the second lens driving unit 2 is a lens driving unit for hand shake correction.

The first lens driving unit 1 may include a base 20 , a bobbin 30 , and a holder member 40 . In addition, a cover member 60 may be further included so that a holder member 40 that forms an outer periphery of the camera module and supports a magnet 41 to be described later may be disposed inside.

The base 20 may be combined with the cover member 60 .

The bobbin 30 may be installed in the inner space of the cover member 60 to be reciprocally movable in the optical axis direction. The bobbin 30 may have the first coil 31 installed on the coil mounting portion 30a formed on the outer circumferential surface.

The bobbin 30 may have upper and lower elastic members 51 and 52 respectively installed at upper and lower portions. One end of the upper elastic member 51 may be connected to the bobbin 30 and the other end may be coupled to the holder member 40 . However, it is not limited thereto, and may be coupled to the cover member 60 if necessary. When coupled to the holder member 40, it may be coupled to the upper or lower surface of the holder member 40. One end of the lower elastic member 52 may be connected to the bobbin 30 and the other end may be coupled to the upper surface of the base 20 or the lower surface of the holder member 40 . In addition, protrusions for coupling the lower elastic member 52 may be formed on the lower side of the base 20, and holes or recesses may be formed at corresponding positions of the lower elastic member 52 so that the lower elastic member 52 may be fixed and rotation may be prevented. In addition, an adhesive or the like may be added for firm fixation, or the protrusion and the elastic member may be coupled by heat fusion.

On the other hand, the upper elastic member 51 is provided with two leaf springs in a two-part structure as shown in FIG. 2, and the lower elastic member 52 is composed of one body and serves as a terminal to receive current. That is, the current applied through the terminal 21b is transferred through the two springs of the upper elastic member 52, and this current can be applied to the first coil 31 wound around the bobbin 30. To this end, the upper elastic member 51 and the first coil 31 may be electrically connected to each other by soldering or the like. Here, the upper elastic member 51 includes an outer portion coupled to the holder member 40, an inner portion coupled to the bobbin 30, and a connection portion connecting the inner portion and the outer portion, and the inner portion may be electrically connected to both ends of the first coil 31 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, it is also possible that the lower elastic member 52 is formed in a bipartite structure and the upper elastic member 51 is integrally configured. Alternatively, the upper elastic member 51 may be formed separately into 4 divisions or more.

By the upper and lower elastic members 51 and 52, the bobbin 30 can be elastically supported in both directions in the optical axis direction. That is, since the bobbin 30 is spaced apart from the holder member 40 by a predetermined distance, the bobbin 30 can be controlled to move upward and downward around the initial position of the bobbin 30 . In addition, the initial position of the bobbin 30 may come into contact with the lower part of the holder member 40, so that the bobbin 30 may be moved only upward with the initial position as the center.

Meanwhile, the first coil 31 may be provided as a ring-shaped coil block coupled to the outer circumferential surface of the bobbin 30 . However, this is not limited, and the coil may be directly wound on the outer circumferential surface of the bobbin 30. As shown in FIG. 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.

Alternatively, the first coil 31 formed of a coil block may have an angular shape or an octagonal shape. That is, all of them may be formed as straight surfaces without curved surfaces. This is in consideration of the electromagnetic action with the magnets 41 disposed oppositely, and if the corresponding surface of the magnet 41 is flat, the electromagnetic force can be maximized when the face of the facing first coil 31 is flat. However, it is not limited thereto, and the surface of the magnet 41 and the surface of the first coil 31 may all be curved, both flat, or one curved surface and the other flat surface according to design specifications.

In addition, the bobbin 30 may include a first surface formed flat on a surface corresponding to the straight surface and a second surface formed round on a surface corresponding to the curved surface so that the first coil 31 may be coupled to the outer circumferential surface. However, the second surface may also be formed flat.

The holder member 40 may be composed of a substantially hexahedral frame. A coupling structure for coupling the upper and lower elastic members 51 and 52 may be provided on the upper and lower surfaces of the holder member 40, and magnets 41 may be installed on four corners or four sides. At this time, as shown in FIG. 2, a seating portion (not shown) may be formed at a location where the magnet 41 is installed. However, it is not limited thereto, and the magnet 41 may be directly adhesively fixed to the inner circumferential surface of the holder member 40 without a mounting portion. In this way, when the magnet 41 is directly fixed to the holder member 40, the magnet 41 may be directly bonded and fixed to the side surface or corner of the holder member 40.

Also, unlike the embodiment, when the lens driving device is configured only with an auto focusing unit instead of an image stabilization device, there may be only the cover member 60 without a separate holder member 40 . The cover member 60 may be formed of a ferromagnetic metal material such as iron. In addition, the cover member 60 may be provided in an angular shape when viewed from above so as to cover all of the bobbin 30 . At this time, the cover member 60 may have a quadrangular shape as shown in FIGS. 1 and 2, or may be provided in an octagonal shape (not shown). In addition, if the cover member 60 has an octagonal shape when viewed from above, and the shape of the magnet 41 disposed at the corner of the holder member 40 is trapezoidal when viewed from above, the magnetic field emitted from the corner of the holder member 40 can be minimized.

On the other hand, the lens driving device according to the present embodiment may be provided with a sensing unit for sensing the motion of the bobbin 30 .

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

The sensing magnet 100 may be smaller and thinner than the magnet 41, and may be provided in a rectangular shape polarized up and down as shown. However, it is not limited thereto, and various configurations such as a square, a triangle, a polygon, and a circle are possible.

The sensing magnet 100 may be installed on the outer circumferential surface of the bobbin 30, and according to the present embodiment, it 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 concave groove formed concavely from the outer circumferential surface of the bobbin 30, but is not limited thereto, and a rib or the like may be formed as a seating portion in a portion where the sensing magnet 100 can be disposed.

The concave depth of the sensing magnet mounting part 30b may correspond to the thickness of the sensing magnet 100 or may be formed to be lower or higher. 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 outside the guide.

Also, the sensing magnet 100 may be disposed at a position where it does not interfere with the first coil 31 . That is, when the first coil 31 is installed on the lower side of the bobbin 30 as shown in FIG. 3 , the sensing magnet 100 may be disposed on the upper side of the bobbin 30 or vice versa. This is to prevent the first coil 31 from affecting the lifting operation 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 on the upper surface of the first coil 31 opposite to the cover member 60 or the holder member 40.

As shown in FIGS. 2 and 3 , the sensing magnet 100 may be disposed so as not to face the magnet 41 . That is, if two or four magnets 41 are installed at the inner corners of the holder member 40, respectively, the sensing magnet 100 may face the holder member 40 so as not to face the magnets 41. The reason for arranging the sensing magnet 100 so as not to face the magnet 41 is to prevent the change in magnetic force of the sensing magnet 100 from interfering with the magnetic force of the magnet 41, so that the first position sensor 300 can accurately feedback the movement of the bobbin 30. Also, the sensing magnet 100 may be disposed above or below the magnet 41 without facing the magnet 41 .

In addition, the sensing magnet 100 may be formed to be polarized up and down. Accordingly, the first position sensor 300 senses the up and down movement of the sensing magnet 100, so that the up and down movement of the bobbin 30 can be accurately identified.

The first position sensor 300 is electrically connected to the circuit board 21 and can output a position detection signal of the bobbin 30 . However, it is not limited thereto, and it is also possible to place a separate board or the like on the sidewall of the holder member 40 to connect the current.

In addition, as shown in FIG. 4 , the first position sensor 300 may be inserted into the position sensor seating part 45 formed on the outer circumferential surface of the holder member 40 . At this time, the inside of the side wall where the seating portion 45 is formed forms a concave portion, so that the thickness of the holder member 40 can be minimized in the seating portion 45 . According to this, since the distance between the first position sensor 300 and the sensing magnet 100 can be minimized, the movement of the bobbin 30 can be detected more accurately.

In addition, as shown in FIG. 2, a correction magnet 200 may be additionally installed on the surface opposite to the surface of the bobbin 30 on which the sensing magnet 100 is installed, but this is optional.

The correction magnet 200 may be installed on the outer circumferential surface of the bobbin 30, and according to the present embodiment, may be fixed to a correction magnet mounting portion (not shown) provided on the bobbin 30 with an adhesive or the like. At this time, the correction magnet mounting portion may be configured as a concave groove formed from the outer circumferential surface of the bobbin 30, but is not limited thereto, and the seating portion on which the correction magnet 200 may be disposed may be formed in a rib shape. The correction magnet mounting portion may be provided in the same shape as the sensing magnet mounting portion, and the depth of the concave groove may be corresponding to, lower, or higher than the thickness of the correction magnet 200 . 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 or may not protrude outside the guide.

The sensing magnet 100 and the correction magnet 200 may have the same size as each other. 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 centers of the sensing magnet 100 and the correction magnet 200 may pass through the center of the bobbin 30 . With this configuration, the attractive forces formed between the sensing magnet 100, the correction magnet 200, and the cover member 60 cancel each other out, so that the center of the bobbin 30 is not biased towards the cover member 60. Therefore, the bobbin 30 is not biased toward the cover member 60, but can be disposed near the center where the attractive force between the sensing magnet 100, the correction magnet 200, and the cover member 60 is balanced, so that it can move in the optical axis direction with the center of the bobbin 30 aligned with the optical axis.

Meanwhile, in the above embodiment, the sensing magnet 100 and the correction magnet 200 are arranged to face the flat straight surface of the cover member 60 as an example, but this is not limited thereto. For example, the sensing magnet 100 and the correction magnet 200 may be disposed so that the corners of the cover member 60 face each other. In this case, the first position sensor 300 may be disposed at a corner side of the cover member 60 corresponding to the sensing magnet 100 . In this case, the magnet 41 may be disposed on the side of the holder member 40 .

In addition, in another embodiment, the first position sensor 300 is disposed on the bobbin, and the sensing magnet 100 is disposed on the holder member 40, or the magnet 41 and the sensing magnet 100 are used in common, and the sensing magnet 100 may be omitted.

The support member 42 supports the movement of the holder member 40 for hand shake correction, and may be formed of a leaf spring or suspension wire. In addition, when the magnet 41 is disposed at the corner of the holder member 40, the support member 42 may be disposed at a side surface of the holder member 40, or may be disposed opposite to each other.

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

On the other hand, as shown in FIGS. 2 and 5, the second lens driving unit 2 is a lens driving unit for hand shake correction, and may include a first lens driving unit 1, a base 20, a support member 42, a first circuit board 21, a second coil 23, and a second position 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 an embodiment, the first circuit board 21 may have a control device for driving the lens driving device installed, and a 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 top of the first circuit board 21 . However, it is not limited thereto, and it is composed only of the first circuit board 21 and the second circuit board 22 can be omitted. In this case, the second coil 23 may be assembled to the first circuit board 21 as an individual component. As shown in FIG. 2 , the first circuit board 21 may be provided as an FPCB 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, as shown in FIG. 6 , may be placed in close contact with the first circuit board 21 .

The second coil 23 may move the entire first lens driving unit 1 in a plane direction perpendicular to the optical axis through interaction with the magnet 41 . As shown in FIG. 2, the second coil 23 may be formed in a patterned coil method on the second circuit board 22, and may be disposed at each corner of the second circuit board 22 at a position corresponding to the bottom surface of the magnet 41.

The second position sensor 21a may be installed on the first circuit board 21 as shown in FIG. 2, but is not limited thereto, and may be separately disposed as a separate component or may be disposed on the side of the second circuit board 22. At this time, the second position sensor 21a may detect a magnetic field of the magnet 41 and detect movement in a direction perpendicular to the optical axis of the holder member 40 on which the magnet 41 is installed.

On the other hand, in the lens driving device capable of simultaneously performing hand shake correction and auto focusing as in the present embodiment, a damping member 400 may be installed to adjust the gain and/or phase of the second, third, and fourth frequencies of the control unit during the operation of the bobbin 30 and the holder member 40, which are movable parts for auto focusing. At this time, the arrangement position of the damping member 400 may be set by the first support unit 1000. According to the present embodiment, the damping member 400 may be disposed on the upper surface of the bobbin 30. To this end, the first support unit 1000 may include a first support part 1100 and a second support part 1200 as shown in FIG. 5 . In addition, a separate damping member 400 may be further installed between the support member 42 and the holder member 40 to adjust the gain and / or phase of the control unit during the operation of the support member 42 and the holder member 40 for hand shake correction.

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

The shapes of the first and second supports 1100 and 1200 may be configured in various ways, but are not limited thereto other than the embodiments shown in FIGS.

For example, as shown in FIG. 8, the first support part 1100 protrudes from the center, and the second support part 1200 can be disposed at a predetermined distance from the first support part 1100 so that the first support part 1100 can be disposed at the center. In this case, the second support part 1200 may be provided in a ring shape. In addition, the first and second support parts 1100 and 1200 are arranged coaxially, and the damping member 400 may be applied at the center or between them.

Alternatively, unlike the above-described embodiment, the second support part 1200 may have an opening on one side. That is, as shown in FIG. 9, the second support part 1200 is integrally formed with the upper elastic member 51, but may be provided in an arc shape that does not interfere 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 of a pair of protruding protruding members, spaced apart from each other by a predetermined distance to form a groove. In addition, the second support part 1200 may be provided in a straight shape and disposed to pass through the groove. In addition, the damping member 400 may be applied to contact both the first and second support parts 1100 and 1200 .

Alternatively, as shown in FIG. 11, the first support part 1100 is formed of a pair of protruding protruding members, and they are spaced apart from each other by a certain distance, but are staggered so as not to face each other to form an L-shaped gap. Also, the second support part 1200 may be provided in a shape bent at least twice and disposed to pass through the gap. In addition, the damping member 400 may be applied to contact both the first and second support parts 1100 and 1200 .

On the other hand, the first support unit 1000 configured as described above protrudes from the bobbin 30 and is 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/disposed may be configured differently. Also, the first support unit 1000 and the fixing protrusion 33 may be disposed on the same surface of the bobbin 30 . For example, when the bobbin 30 has an octagonal shape including eight faces, the fixing protrusions 33 and the first support unit 1000 may be disposed on the sidewalls forming the four faces, respectively, and may be arranged to form a pair.

Meanwhile, as shown in FIG. 6, a second support unit 2000 may be further included in addition to the first support unit 1000, or the second support unit 2000 may be configured without the first support unit 1000. At this time, the second support unit 2000 is disposed between the fixing part for fixing the upper elastic member 51 to the holder member 40 side and the fixing protrusion 33, and the holder member 40. It can be disposed on the upper surface. In addition, 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 support unit 1000 may be disposed on four wall surfaces together with the fixing protrusions 33, and the second support unit 2000 may be disposed at a total of four locations on the other surfaces on which the first support unit 1000 is not disposed. At this time, the damping member 400 applied to the first and second support units 1000 and 2000 may be configured identically.

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

The third support part 2100 may protrude from the upper side of the holder member 40, and as shown, may be disposed at a position spaced apart from the first support part 1100 (see FIG. 5) by a predetermined distance. The third support part 2100, together with the first support part 1100, guides the disposition position of the damping member 400, and is connected to the fourth support part 2200 by the applied damping member 400, and can also perform a role of fixing the upper elastic member 51 to the holder member 40 side.

The fourth support part 2200 may be integrally formed with the upper elastic member 51, and may be configured in a form surrounding the third support part 2100 as shown. The fourth support part 2200 may be configured in various forms. For example, as shown in FIG. 6, the third support part 2100 may be wrapped in an arc shape, but is not limited thereto.

On the other hand, the second support unit 2000 configured as described above is an upper side of the holder member 40, and the first support unit 1000, the upper elastic member 51, and the holder member 40 are fixed. It can be disposed between the fixing part. However, when the bobbin 30 moves up and down, it may be disposed at a predetermined distance from the outer circumferential surface of the bobbin 30 to prevent interference.

According to this configuration, since the damping member 400 is disposed on the side of the bobbin 30 through the first support unit 1000 and/or disposed on the side of the holder member 40 through 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, thereby improving product reliability, and of the upper elastic member 51 The shape can be simplified.

Meanwhile, as shown in FIG. 7 , a third support unit 3000 may be selectively installed instead of or in parallel with the first support unit 1000 or the second support unit. That is, it may be composed of only the third support unit 3000 without the first and second support units 1000 and 2000, or only one of the first, second and third support units 1000, 2000 and 3000, or a combination of two or all of them. The third support unit 3000 may include a fifth support part 3100 and a sixth support part 3200 .

The fifth support part 3100 protrudes from the upper surface of the bobbin 30 or the upper surface of the holder member 40, and may be configured in the same way as the above-described first support part 1100 (see FIG. 5). The fifth support part 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 and the damping member 400 through the interposition.

The sixth support part 3200 is integrally formed with the upper elastic member 51 and, as shown in FIG. 7 , may be formed to cover the fifth support part 3100 at least twice. That is, one end of the upper elastic member 51 is fixed to the fixing protrusion 33 integrally protruding from the bobbin 30, and the other end thereof is fixed to the holder member 40 side. For example, the fixing protrusions 33 are formed at a total of four locations, and when the shape of the bobbin 30 is an octagon, two protrudes from each end of a pair facing each other, and the fifth support portion 3100 is formed. A total of four fifth support portions 3100, two per side, may be protruded. However, it is not limited thereto, and may be used together with the above-described first support unit 1000, and 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 support units 1000 to 3000, the amount of extension of the damping member 400 compared to the existing lens driving distance is reduced by more than half, so damage to the damping member 400 can be minimized.

In addition, since the damping member 400 is applied to the connecting portion between the bobbin 30 and the upper elastic member 51 through the first support unit 1000 instead of applying the gap, the damping member 400 can be prevented from permeating into other parts such as the inside of the bobbin 30 during the application process of the damping member 400.

In addition, since the heights of the first, third and fifth supports 1100, 2100 and 3100 in the form of protrusions formed on the bobbin 30 are equal to or higher than the height of the upper elastic member 51, the flow and driving distance of the applied damping member 400 can be minimized.

In addition, the spring leg of the upper elastic member 51 can be made thick in the width direction and long in the length direction, so that the secondary frequency in the left and right width directions can be moved to 300 Hz or later while maintaining the primary frequency similar to the conventional one, making it easier to control.

In addition, by applying the damping member 400 between the fixing parts of the upper elastic member 51 and the holder member 40 or between the fixing positions of the bobbin 30 and the upper elastic member 51, the damping amount of the damping member 400 can be easily adjusted, thereby improving product distribution and workability.

In addition, since the gain is suppressed through the addition of the damping member 400 or the Q value is lowered so that the phase change is gentle, when the gain change is rapid at the resonance frequency, the phase change also occurs rapidly, which can improve the instability of feedback control, reduce the peak of the resonance frequency, and suppress the second, third, and fourth resonance frequencies.

In addition, through the application of the damping member 400 between a part of the connection part of the upper elastic member 51 and the holder member or the fixing part of the upper elastic member 51, the connection part 51 of the upper elastic member is bent more than once. It is possible to smooth the change in frequency.

Meanwhile, the lens driving device having the sensing magnet 100 and the correction magnet 200 configured as shown in FIGS. 1 to 4 is capable of unidirectional control and bidirectional control. That is, the base 20 and the bobbin 30 may be placed in close contact at their initial positions. For example, a stopper may be formed on the side of the holder member 40 to form an initial position by contacting the bottom surface of the bobbin 30, or conversely, although not shown, a stopper may be protruded from the bottom surface of the bobbin 30, and the stopper may be placed in contact with the upper surface of the base 20. In addition, in the case of a single direction, the upper and lower elastic members 51 and 52 may be formed so that the initial position of the bobbin 30 is in close contact with the base 20 in a state in which a predetermined amount of preload is added, so that when power is applied, the bobbin 30 rises by electromagnetic interaction, and when power is cut off, the bobbin 30 can return to its 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 spaced apart from each other by a predetermined distance from their initial positions. In this case, the upper and lower elastic members 51 and 52 may be formed in a flat state without preload or in a state where a certain preload is applied. In this case, in the initial state where the bobbin 30 is spaced apart from the base 20 by a predetermined distance, when power is applied, depending on the polarity of the applied current, for example, when a constant current is applied, the bobbin 30 may rise based on the initial position, or may descend based on the initial position when reverse current is applied.

In this way, in performing the auto focusing function by controlling the elevation of the bobbin 30, the present embodiment can check the more accurate position of the bobbin 30 using the sensing magnet 100, thereby minimizing the time required for the auto focusing operation. In particular, since the correction magnet 200 installed at a position opposite to the sensing magnet 100 cancels the attractive force between the sensing magnet 100 and the cover member 60, the bobbin 30 can move while maintaining a coaxial state with the cover member 60 as much as possible.

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 image sensor 11 is mounted on the printed circuit board 10 and may form a bottom surface of the camera module.

The bobbin 30 may include a lens barrel in which at least one lens is installed, and the lens barrel may be formed to be screwed into the bobbin 30 . However, this is not limited, and although not shown, the lens barrel may be directly fixed to the inside of the bobbin 30 by a method other than screw coupling, or the one or more lenses may be integrally formed with the bobbin without the lens barrel. The lens may be composed of one sheet, or two or more lenses may form an optical system.

An infrared cut filter may be additionally installed on the base 20 at a position corresponding to the image sensor 11 and may be combined with the holder member 40 . In addition, the lower side of the holder member 40 can be supported. A separate terminal member may be installed on the base 20 to conduct electricity with the printed circuit board 10, or it is possible to integrally form the terminal using a surface electrode or the like. Meanwhile, the base 20 may function as a sensor holder to protect the image sensor 11, and in this case, a protrusion may be formed downward along a side surface of the base 20. However, this is not an essential configuration, and although not shown, a separate sensor holder may be disposed below the base 20 to perform its role.

Although the embodiments according to the present embodiment have been described above, this is only exemplary, and those skilled in the art will understand that various modifications and embodiments of equivalent scope are possible therefrom. Therefore, the true technical protection scope of this embodiment should be defined by the following claims.

10; Printed circuit board 11; image sensor
20; base 21; 1st circuit board
22; a second circuit board 30; bobbin
31; coil unit 40; holder member
51; Upper elastic member 52; lower elastic member
60; cover member 100; sensing magnet
200; correction magnet 300; 1st position detection sensor
400; Damping member 1000; 1st support unit
1100; first support 1200; 2nd support
2000; a second support unit 2100; 3rd support
2200; a fourth support 3000; 3rd support unit
3100; a fifth support 3200; 6th support

Claims (20)

Base;
a holder member disposed on the base;
a bobbin disposed within the holder member;
a first magnet and a first coil for moving the bobbin in an optical axis direction;
a second coil disposed on the base;
an upper elastic member coupled to an upper surface of the holder member and the bobbin; and
And a first damping member disposed on the upper elastic member,
The upper elastic member includes an outer portion coupled to the upper surface of the holder member, an inner portion coupled to the bobbin, and a connection portion connecting the outer portion and the inner portion,
The first damping member overlaps the connection portion of the upper elastic member and the holder member in the optical axis direction. According to claim 1,
The first damping member does not overlap with the bobbin in the optical axis direction. According to claim 1,
a support member supporting movement of the holder member; and
A lens driving device comprising a second damping member disposed between the support member and the holder member. According to claim 3,
The first damping member is a lens driving device spaced apart from the support member. According to claim 1,
When viewed from above, a distance between the first damping member and the outer portion of the upper elastic member is shorter than a distance between the first damping member and the inner portion of the upper elastic member. According to claim 1,
When viewed from above, the holder member includes a first support portion formed between the outer portion of the upper elastic member and the bobbin,
The first damping member contacts the first support portion of the holder member and the connection portion of the upper elastic member. According to claim 6,
The lens driving device of claim 1 , wherein the first support portion of the holder member includes a portion having a curvature when viewed from above. According to claim 7,
The first damping member contacts the curved portion of the first support part. According to claim 6,
The lens driving device of claim 1 , wherein the first support portion of the holder member protrudes from the upper surface of the holder member. According to claim 6,
At least a portion of the first damping member is disposed between the connection portion of the upper elastic member and the first support portion of the holder member. According to claim 6,
The lens driving device of claim 1 , wherein the first support portion of the holder member is disposed closer to an inner surface of the holder member than to an outer surface of the holder member. According to claim 1,
The first damping member is spaced apart from the outer portion of the upper elastic member. According to claim 1,
The first damping member is spaced apart from the inner portion of the upper elastic member. According to claim 1,
A lens driving device including a second magnet disposed on the bobbin. According to claim 14,
and a third magnet disposed on the bobbin and overlapping the second magnet in a direction perpendicular to the optical axis direction. According to claim 1,
And a lower elastic member coupled to the lower surface of the holder member and the bobbin,
The first damping member is a lens driving device spaced apart from the lower elastic member. Base;
a holder member disposed on the base;
a bobbin disposed within the holder member;
a first magnet and a first coil for moving the bobbin in an optical axis direction;
a second coil disposed on the base;
an upper elastic member coupled to an upper surface of the holder member and the bobbin; and
And a first damping member disposed on the upper elastic member,
The upper elastic member includes an outer portion coupled to the upper surface of the holder member, an inner portion coupled to the bobbin, and a connection portion connecting the outer portion and the inner portion,
The first damping member directly connects the connection portion of the upper elastic member and the holder member. According to claim 17,
The first damping member does not overlap the bobbin and the outer portion of the upper elastic member in the optical axis direction. printed circuit board;
an image sensor disposed on the printed circuit board; and
A camera module comprising the lens driving device of any one of claims 1 to 18. Base;
a holder member disposed on the base;
a bobbin disposed within the holder member;
a first magnet and a first coil for moving the bobbin in an optical axis direction;
a second coil disposed on the base; and and
A lens driving device comprising an upper surface of the holder member and an upper elastic member coupled to the bobbin.