KR20220058866A - Lens moving unit and camera module having the same - Google Patents

Abstract

A lens driving device according to the present embodiment comprises: a first lens driving unit; a second lens driving unit that moves the entire first lens driving unit in second and third directions perpendicular to an optical axis and different from each other; a sensing unit sensing movement of a bobbin in a direction parallel to the optical axis; upper and lower elastic members having one end connected to the bobbin and the other end coupled to a 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 a disposition of the damping member. The present embodiment provides the lens driving device having an auto-focusing and hand-shake correction function capable of accurately receiving feedback on positional information of the bobbin and the holder member, and a camera module having the same.

Description

A lens driving device and a camera module having the same {Lens moving unit and camera module having the same}

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

The camera module includes an image sensor and a printed circuit board on which an image sensor that transmits electrical signals is mounted, an infrared cut-off filter that blocks light in an infrared region to the image sensor, and at least one or more lenses that transmit an image to the image sensor It may include an optical system consisting of. In this case, 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 a lot. The voice coil unit motor operates by electromagnetic interaction of the coil unit wound on the outer circumferential surface of the bobbin in which the magnet fixed to the housing and the lens barrel are coupled to perform the auto-focusing function. Such an actuator module of the voice coil motor type may reciprocate 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.

During auto-focusing and hand-shake correction of the camera module, a problem may occur in the control of the lens driving device depending on the vibration frequency of the elastic member.

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

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

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

The lens driving device according to the present embodiment includes a bobbin having at least one lens installed inside, a first coil installed on an outer circumferential surface, and a holder member supporting a magnet disposed around the bobbin, the magnet a first lens driving unit for moving the bobbin and the first coil in a first direction parallel to an optical axis by a first coil interaction with each other; and a base disposed to be spaced apart from the bobbin and the first lens driving unit by a predetermined distance, and movably supporting the first lens driving unit in second and third directions with respect to the base, and supplying power to the first coil. a support member capable of being capable of, and a second coil disposed to face the magnet of the first lens driving unit, and a detection sensor for detecting positions in the second and third directions of the second lens driving unit with respect to the base a second lens driving unit having a circuit board and configured to move the entire first lens driving unit including the bobbin in second and third directions that are perpendicular to the optical axis and are different from each other by the interaction between the magnet and the second coil; a sensing unit for detecting a movement in a direction parallel to the optical axis of the bobbin; upper and lower elastic members having one end connected to the bobbin and the other end coupled to the holder member to elastically support the ascending and descending operation of the bobbin; a damping member disposed on the upper surface of the bobbin; and a first support unit provided on each of the bobbin and the upper elastic member to maintain the disposition position of the damping member.

The first support unit may include a first support portion formed on an upper side of the bobbin; and a second support part formed at a position corresponding to the first support part of the upper elastic member so as not to interfere with the first support part and to surround the circumference of the first support part.

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

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

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

Alternatively, the first support unit is formed on the upper side of the bobbin, the first support portion provided with a pair of different members spaced apart from each other by a predetermined distance; and a second support part formed at a position corresponding to the first support part of the upper elastic member to pass through a gap formed between the first support parts without interfering with the first support part; may be formed by bending at least twice.

The sensing unit may include a second magnet installed on an outer peripheral surface of the bobbin; and a position sensor disposed on the side wall of the cover member and disposed 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 disposed to be spaced apart from a coupling portion of the upper elastic member and the bobbin by a predetermined distance.

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

In this case, the second support unit may include a third support portion formed on an upper side of the holder member; and a fourth support part formed at a position corresponding to the third support part of the upper elastic member so as not to interfere with the third support part and to surround the circumference of the third support part, wherein the damping member includes the first And it may be applied to both the second support unit.

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 is provided on each of the bobbin and the upper elastic member to maintain the arrangement position of the damping member, wherein the third support unit includes a fifth support part formed on the upper side of the bobbin. ; and a sixth support part formed at a position corresponding to the fifth support part of the upper elastic member so as not to interfere with the fifth support part and to surround the circumference of the fifth support part; 5 It may be formed to be bent so as to wrap 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, product dispersion and workability can be improved by applying the damper between the fixing part of the elastic member and 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. .

In addition, since the gain is suppressed through the addition of a damping member or the Q value is lowered so that the phase change is gentle, when the gain change is abrupt at the resonant frequency, the phase change also occurs abruptly, which increases the instability of the feedback control. It can be improved, and the peak (peak) of the resonant frequency can be reduced and the second, third, and fourth resonant frequencies can be suppressed.

In addition, by applying a damping member between a part of the connection part of the elastic member and the holder member or the fixing part of the elastic member, it is possible to gently bend the connection part of the elastic member at least once to soften the change in frequency.

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 the coupling state of 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 the coupling state of the upper elastic member and the bobbin and the shape of the damping member according to the second embodiment;
7 is a plan view showing the coupling state of the upper elastic member and the bobbin and the shape of the damping member according to the third embodiment;
8 to 11 schematically show possible configurations of the damping element and the support unit according to
12 is a graph illustrating a resonant frequency gain change rate before and after applying the damping member according to the present embodiment.

Hereinafter, any one of the "magnet 41", the "sensing magnet 100" and the "correction magnet 200" is referred to as a "first magnet", the other is referred to as a "second magnet", and the other one is referred to as a "second magnet". 3 magnets". Hereinafter, "first support 1100", "second support 1200", "third support 2100", "fourth support 2200", "fifth support 3100", and "sixth support part 2100" One of the support parts 3200 is called a "first support part", the other one is called a "second support part", the other one is called a "third support part", the other is called a "fourth support part", and the other is called a "fourth support part". The fifth support part" and the other one may be called a "sixth support part".

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

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

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 . In this case, the first lens driving unit 1 is a lens driving unit for autofocus, and the second lens driving unit 2 is a lens driving unit for correcting hand shake.

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

The base 20 may be coupled to 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 a first coil 31 installed on a coil receiving part 30a formed on an outer circumferential surface.

The bobbin 30 may have the upper and lower elastic members 51 and 52 installed at the upper and lower portions, respectively. 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, the present invention 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 surface or the 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, 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 is formed at a corresponding position of the lower elastic member 52 , so that their By coupling, the lower elastic member 52 may be fixed, and rotation may be prevented. In addition, an adhesive may be added for firm fixation, and the protrusion and the elastic member may be coupled by thermal fusion or the like.

Meanwhile, 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. 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 may 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, the inner portion of the first coil 31 . It can be electrically connected to both ends through soldering or the like. That is, the two springs and both ends of the first coil 31 may be electrically connected to each other by soldering, Ag epoxy, welding, conductive epoxy, or the like. However, the present invention is not limited thereto, and conversely, the lower elastic member 52 is formed in a two-part structure, and it is also possible that the upper elastic member 51 is integrally configured. Alternatively, the upper elastic member 51 may be formed to be divided into four or more.

Bidirectional movement of the bobbin 30 in the optical axis direction may be elastically supported by the upper and lower elastic members 51 and 52 . That is, since the bobbin 30 is spaced apart from the holder member 40 by a predetermined distance, the movement of the bobbin 30 in the upper and lower directions can be controlled based on the initial position of the bobbin 30 . In addition, the initial position of the bobbin 30 is brought into contact with the lower portion of the holder member 40 , so that movement can be controlled only upward based on the initial position of the bobbin 30 .

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, the present invention is not limited thereto, 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 in 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 . there is.

Alternatively, the first coil 31 formed of the coil block may have an angular shape or an octagonal shape. That is, all of the straight surfaces may be formed without a curved surface. This is in consideration of the electromagnetic action with the magnet 41 disposed to face each other. 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, the present invention is not limited thereto, and the surface of the magnet 41 and the surface of the first coil 31 may be all curved, all flat, or one curved surface and the other flat surface according to design specifications.

In addition, the bobbin 30 has a first surface formed flat on a surface corresponding to the straight surface and a first surface formed to be rounded on a surface corresponding to the curved surface so that the first coil 31 can be coupled to the outer peripheral surface. It may include two surfaces, but the second surface may be a flat surface.

The holder member 40 may be configured as a frame having a substantially hexahedral shape. 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, respectively, and the magnets 41 are installed on the four corners or the four sides. can At this time, as shown in FIG. 2 , a seating portion (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 adhesively fixed to the inner circumferential surface of the holder member 40 without a seating portion. As such, when the magnet 41 is directly fixed to the holder member 40 , the magnet 41 may be directly bonded and fixed to a side surface or a corner of the holder member 40 .

Also, unlike the embodiment, when the lens driving device is configured only with the auto focusing unit instead of the hand shake correcting device, only the cover member 60 may be provided 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 a angular shape when viewed from the upper side so as to cover all of the bobbin 30 . At this time, the cover member 60 may have a rectangular shape as shown in FIGS. 1 and 2 , or may be provided in an octagonal shape although not shown. In addition, when the cover member 60 when viewed from the top has an octagonal shape, if the shape of the magnet 41 disposed at the edge of the holder member 40 is a trapezoid shape when viewed from the top, discharge from the edge of the holder member 40 The magnetic field can be minimized.

On the other hand, the lens driving device according to the present embodiment may be provided with a sensing unit for detecting 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 sensor 300 may be installed on the holder member 40 .

The sensing magnet 100 may be configured to be smaller and thinner than the magnet 41 , and may be provided in a vertical polarized rectangle as shown. However, the present invention 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 peripheral surface of the bobbin 30 , and according to this embodiment, it may be fixed to the sensing magnet mounting part 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 from the outer circumferential surface of the bobbin 30, but is not limited thereto. may be formed.

The concave depth of the sensing magnet mounting portion 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 part 30b with an adhesive or the like, the sensing magnet 100 may not protrude out of the guide.

In addition, the sensing magnet 100 may be disposed at a position that 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 of the first coil 31 facing the cover member 60 or the holder member 40 . It may be disposed on the upper surface.

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 in the inner corner of the holder member 40, respectively, the sensing magnet 100 is the holder member 40 so as not to face the magnets 41. It may be arranged so as to face the side wall of the The reason for disposing the sensing magnet 100 so as not to face the magnet 41 as described above is to prevent a change in the magnetic force of the sensing magnet 100 from interfering with the magnetic force of the magnet 41, so that the first position detection sensor ( This is to allow the 300) to accurately feed back 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 vertically polarized. Accordingly, the first position detection sensor 300 detects the vertical movement of the sensing magnet 100 , and the bobbin 30 moves vertically. can be accurately identified.

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

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

In addition, as shown in FIG. 2 , a correction magnet 200 may be additionally installed on the surface of the bobbin 30 opposite to the surface 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 this embodiment, it may be fixed to a correction magnet mounting part (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 groove formed concavely from the outer peripheral surface of the bobbin 30, but is not limited thereto, and the seating portion in which the correction magnet 200 can be disposed may be formed in a rib shape, etc. there is. The correction magnet mounting part may be provided in the same shape as the sensing magnet mounting part, and the depth of the concave groove may correspond to the thickness of the correction magnet 200 , or may be formed to be lower or higher. Therefore, when the correction magnet 200 is fixed to the correction magnet mounting part with an adhesive or the like, the correction magnet 200 may or may not protrude out of the guide.

The sensing magnet 100 and the correction magnet 200 may be provided to have 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, an imaginary extension line connecting the centers of the sensing magnet 100 and the correction magnet 200 may be disposed to pass through the center of the bobbin 30 . Due to this configuration, the attractive force formed between the sensing magnet 100 , the correction magnet 200 , and the cover member 60 is offset from each other, and the center of the bobbin 30 is not drawn toward the cover member 60 . Therefore, the bobbin 30 is not biased toward the cover member 60, and may 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. It is possible to move in a state in which the center of the bobbin 30 and the optical axis are aligned in the direction.

Meanwhile, in the above embodiment, the sensing magnet 100 and the correction magnet 200 are disposed to face the flat straight surface of the cover member 60 as an example, but the present invention is not limited thereto. For example, the sensing magnet 100 and the correction magnet 200 may be disposed to face the edge of the cover member 60 . In this case, the first position sensor 300 may be disposed on the edge 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 another embodiment, the first position sensor 300 is disposed on a bobbin, and the sensing magnet 100 is disposed on the holder member 40, or the magnet 41 and the sensing magnet 100 are shared. Therefore, the sensing magnet 100 may be omitted.

The support member 42 supports the movement of the holder member 40 to compensate for hand shake, and may be formed of a leaf spring or a suspension wire. In addition, when the magnet 41 is disposed at the edge of the holder member 40, the support member 42 may be disposed on the side 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 that implements another type of auto-focusing function in addition to the above-described configuration. That is, it is also possible to configure an optical module using a single-lens moving actuator or a refractive index variable actuator instead of using a voice coil motor-type auto-focusing actuator. That is, the first lens driving unit 1 may be any optical actuator capable of performing an auto-focusing function.

Meanwhile, as shown in FIGS. 2 and 5, the second lens driving unit 2 is a lens driving unit for image stabilization, and includes a first lens driving unit 1, a base 20, a support member 42, and a second lens driving unit. It may include a first circuit board 21 , a second coil 23 , and a second position detection sensor 21a. In another embodiment, the second coil 23 may be disposed on the second circuit board 22 by further including the second circuit board 22 .

In an embodiment, a control element for driving a lens driving device may be installed on the first circuit board 21 , and a second coil 23 having a pattern shape 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 only the first circuit board 21 is configured, 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 provided as 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 may be disposed in close contact with the first circuit board 21 as shown in FIG. 6 .

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 has a position corresponding to the bottom surface of the magnet 41 , and is a second circuit board. (22) may be disposed on each corner portion.

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 the second circuit board 22 ) may be placed on the side. At this time, the second position detection sensor 21a may detect the magnetic field of the magnet 41 to detect a movement in a direction perpendicular to the optical axis of the holder member 40 in which the magnet 41 is installed.

On the other hand, as in the present embodiment, in the lens driving device capable of simultaneously performing handshake correction and auto-focusing, the second, third, and fourth orders of the control unit are operated during the operation of the bobbin 30 and the holder member 40, which are movable parts for auto-focusing. A damping member 400 may be installed to adjust a gain and/or a phase with respect to a frequency. At this time, the 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 . there is. 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 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 handshake correction. more can be installed.

The first support 1100 may be integrally formed on the upper side of the bobbin 30 and may be provided in a protrusion shape. In addition, 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 1200 may be formed in a portion of the connection portion of the upper elastic member (51).

The shapes of the first and second support units 1100 and 1200 may be variously configured. In addition to the embodiments shown in FIGS. 8 to 11 , the present invention is not limited thereto, and the periphery of the first support unit 1100 is not limited thereto. Any configuration is applicable as long as the second support 1200 surrounds the .

For example, as shown in FIG. 8 , the first support part 1100 is disposed protruding from the center, and the second support part 1200 is the first support part 1100 so that the first support part 1100 can be disposed in the center. and may be spaced apart from each other by a certain distance. In this case, the second support 1200 may be provided in a ring shape. In addition, the first and second support parts 1100 and 1200 are coaxially disposed, and the damping member 400 may be applied to the center or between them.

Alternatively, unlike the above embodiment, the second support 1200 may have an opening at one side. That is, as shown in FIG. 9, the second support 1200 may be formed integrally with the upper elastic member 51, and may be provided in an arc shape that does not interfere with the first support 1100, It is the same that the damping member 400 is applied in a state in which they are disposed correspondingly.

Alternatively, as shown in FIG. 10 , the first support part 1100 is formed of a pair of protruding protrusion members, and they are spaced apart from each other by a predetermined distance to form a groove. In addition, the second support 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 be in contact with 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 protrusion members, which are spaced apart from each other by a certain distance, and are alternately arranged so as not to face each other to form an L-shaped gap. there is. In addition, the second support part 1200 may be provided to be bent at least twice, and may be disposed to pass through the gap. In addition, the damping member 400 may be applied to be in contact with both the first and second support parts 1100 and 1200 .

On the other hand, as shown in FIG. 5 , the first support unit 1000 configured as described above is formed to protrude from the bobbin 30 , and the fixing protrusion 33 is fixed to one end of the upper elastic member 51 . and may be spaced apart from each other by a certain distance. That is, the position at which the upper elastic member 51 is fixed and the position at which 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 as a whole including eight faces, the fixing protrusions 33 and the first support unit 1000 may be respectively disposed on the side walls forming the four faces, and each one They may be arranged to form a pair each.

Meanwhile, as shown in FIG. 6 , the second support unit 2000 may be further included in addition to the first support unit 1000 , or the second support unit 2000 is configured without the first support unit 1000 . You may. 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 , the upper part of the holder member 40 . It can be placed on the surface. Also, the first support unit 1000 and the second support unit 2000 may be disposed to 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 protrusion 33 , and the second support unit 2000 may One support unit 1000 may be disposed in a total of four places on the other surfaces not 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 part 2100 and a fourth support part 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, the upper elastic A role of fixing the member 51 to the side of the holder member 40 may also be performed.

The fourth support part 2200 may be integrally formed with the upper elastic member 51 , and may be configured to surround the third support part 2100 as shown. The fourth support 2200 may be configured in various shapes. For example, although the third support 2100 may be wrapped around the third support 2100 in an arc shape as shown in FIG. 6 , the present invention is not limited thereto, and FIG. 8 . It is also possible to have various configurations like the second support 1200 shown in FIGS.

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 thereto. It can be placed between governments. However, when the bobbin 30 moves up and down, it may be disposed to be spaced apart from the outer peripheral surface of the bobbin 30 by a predetermined distance 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 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 may be coated with the damping member 400 , thereby improving product reliability and simplifying the shape of the upper elastic member 51 .

On the other hand, as shown in FIG. 7 , the third support unit 3000 may be selectively installed at the position of the first support unit 1000 or the position of the second support unit, alternatively or in parallel. That is, it may consist of only the third support unit 3000 without the first and second support units 1000 and 2000, or any one of the first, second, and third support units 1000, 2000, and 3000 or It may consist of a combination of the two or both. The third support unit 3000 may include a fifth support part 3100 and a sixth support part 3200 .

The fifth support part 3100 is formed to protrude from the upper surface of the bobbin 30 or the upper surface of the holder member 40 , and may have the same configuration as the above-described first support part 1100 (refer to FIG. 5 ). The fifth support part 3100 may be formed to protrude from the upper surface of the upper surface of the bobbin 30 or the upper surface of the holder member 40 in a protrusion shape, and to be connected with the upper elastic member 51 and the damping member 400 interposed therebetween. can

The sixth support part 3200 is integrally formed with the upper elastic member 51 and may be formed to wrap the fifth support part 3100 at least twice as shown in FIG. 7 . 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 is fixed to the holder member 40 side. At this time, the upper portion connected to both ends The elastic member 51 may overlap the configuration of the sixth support part 3200 bent in an arc shape. For example, the fixing protrusions 33 are formed in a total of four places, and when the shape of the bobbin 30 is octagonal, two protruding from each end of a pair of facing each other, the fifth support part 3100 A total of four fifth support parts 3100 may be formed to protrude from the surface on which is formed, two on one surface. However, the present invention is not limited thereto, and may be used together with the first support unit 1000 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 support units 1000 to 3000, the amount of the damping member 400 stretched compared to the existing lens driving distance is reduced by more than half, so the damping member Damage to 400 can be minimized.

In addition, since the damping member 400 is applied to the connection 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 is applied during the application process, It is possible to prevent the damping member 400 from permeating into other parts such as the inside of the bobbin 30 .

In addition, since the heights of the first, third, and fifth support parts 1100 , 2100 , 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 damping member applied The flow and driving distance of 400 can be minimized.

In addition, the spring leg of the upper elastic member 51 can be thickened in the width direction and formed to be long in the longitudinal direction, so that the primary frequency is maintained similar to the existing one, while the secondary frequency in the left and right width direction is increased. It can move after 300Hz, making it easier to control.

In addition, by applying the damping member 400 between the fixed portion of the upper elastic member 51 and the holder member 40 or between the fixed positions of the bobbin 30 and the upper elastic member 51 , the damper of the damping member 400 is Since the amount can be easily adjusted, product dispersion and workability can be improved.

In addition, by adding the damping member 400, the gain is suppressed or the Q value is lowered so that the phase change becomes gentle. It is possible to improve the point of increasing the instability, and it is possible to reduce the peak (peak) of the resonant frequency and suppress the 2nd, 3rd, and 4th resonant frequencies.

In addition, by applying 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 one or more times. Changes in frequency can be smoothed out.

On the other hand, the lens driving device having the sensing magnet 100 and the correction magnet 200 configured as shown in FIGS. 1 to 4 can perform unidirectional control or bidirectional control. That is, the base 20 and the bobbin 30 may be closely disposed at an initial position. For example, a stopper may be formed on the side of the holder member 40 to form an initial position in contact with the bottom surface of the bobbin 30 . Conversely, although not shown, the stopper is located on the bottom surface of the bobbin 30 It is also possible to form a protrusion so that the stopper is disposed in contact with the upper surface of the base 20 . In addition, in the unidirectional case, 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 with a predetermined amount of preload applied, When power is applied, the bobbin 30 rises by electromagnetic interaction, and when power is cut off, the bobbin 30 may 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 disposed to be spaced apart from each other by 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 no preload is applied, or may be formed in a state in which a predetermined preload is applied. In this case, in an initial state in which 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. Also, when a reverse current is applied, it may descend based on the initial position.

In this way, in performing the auto-focusing function by controlling the lifting of the bobbin 30, in the present embodiment, the position of the bobbin 30 can be more accurately confirmed by using the sensing magnet 100, which is required for the auto-focusing operation. time can be minimized. In particular, since the sensing magnet 100 and the correction magnet 200 installed at the opposite position offset the attractive force between the sensing magnet 100 and the cover member 60, the bobbin 30 is coaxial with the cover member 60 as much as possible. You can make it move while maintaining a 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 . In this case, the printed circuit board 10 may have the image sensor 11 mounted thereon, 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 screw-coupled to the inside of the bobbin 30 . However, the present invention is not limited thereto, and although not shown, the lens barrel may be directly fixed to the inside of the bobbin 30 by a method other than screwing, or the one or more lenses may be integrally formed with the bobbin without a lens barrel. . The lens may be configured as a single sheet, or two or more lenses may be configured to form an optical system.

In the base 20 , an infrared cut filter may be additionally installed at a position corresponding to the image sensor 11 , and may be coupled to the holder member 40 . In addition, the lower side of the holder member 40 may be supported. A separate terminal member may be installed on the base 20 to conduct electricity with the printed circuit board 10 , and it is also 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 in a downward direction along the side surface of the base 20 . However, this is not an essential configuration, and although not shown, a separate sensor holder may be disposed under the base 20 to perform its role.

Although the embodiments according to the present embodiment have been described above, it will be understood that this is merely an example, and a person skilled in the art will understand that various modifications and equivalent ranges of the embodiments are possible therefrom. Accordingly, 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; first 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; compensating magnet 300; first position sensor
400; damping member 1000; first support unit
1100; a first support 1200; second support
2000; a second support unit 2100; third support
2200; the fourth support 3000; 3rd support unit
3100; a fifth support 3200; 6th support

Claims (15)

holder member;
a bobbin disposed in the holder member;
a first coil disposed on the bobbin;
a first magnet disposed on the holder member;
a first elastic member coupled to the bobbin and the holder member; and
a first damping member disposed on the first elastic member;
The first elastic member includes an outer portion coupled to the holder member, an inner portion coupled to the bobbin, and a connecting portion connecting the outer portion and the inner portion,
The holder member includes a first support portion formed between the outer portion of the first elastic member and the inner portion of the first elastic member,
The first damping member overlaps the first elastic member in an optical axis direction and is in contact with the first support part of the holder member and the connection part of the first elastic member. holder member;
a bobbin disposed in the holder member;
a first coil disposed on the bobbin;
a first magnet disposed on the holder member;
a first elastic member coupled to the bobbin and the holder member; and
a first damping member disposed on the first elastic member;
The first elastic member includes an outer portion coupled to the holder member, an inner portion coupled to the bobbin, and a connecting portion connecting the outer portion and the inner portion,
The holder member includes a first surface and a protrusion protruding from the first surface,
The first damping member is in contact with the protrusion of the holder member and the connecting portion of the first elastic member. Base;
a holder member disposed on the base;
a bobbin disposed in the holder member;
a first coil disposed on the bobbin;
a first magnet disposed to overlap the first coil in a first direction perpendicular to the optical axis direction;
a second coil disposed to overlap the first magnet in the optical axis direction;
a first elastic member connected to the holder member and the bobbin; and
a first damping member in contact with the first elastic member;
The first elastic member includes an outer portion coupled to the holder member, an inner portion coupled to the bobbin, and a connecting portion connecting the outer portion and the inner portion,
The holder member includes an upper surface and a first support portion formed on the upper surface,
the first damping member is in contact with the first supporting part of the holder member and the connecting part of the first elastic member;
The first support portion of the holder member is disposed between the outer portion of the first elastic member and the inner portion of the first elastic member. 4. The method according to any one of claims 1 to 3,
The first damping member is a lens driving device spaced apart from the outer portion of the first elastic member. 4. The method according to any one of claims 1 to 3,
The first damping member is a lens driving device spaced apart from the inner portion of the first elastic member. 4. The method of claim 1 or 3,
The lens driving device including a shape corresponding to the upper shape of the first support part of the connecting portion of the first elastic member. 4. The method of claim 1 or 3,
A portion of the first damping member is disposed between the connection part of the first elastic member and the first support part. 4. The method of claim 1 or 3,
and a second magnet disposed on the bobbin. 9. The method of claim 8,
and a third magnet disposed on the bobbin and overlapping the second magnet in a direction perpendicular to the optical axis direction. 4. The method of claim 1 or 3,
The first support portion is disposed closer to the inner surface of the holder member than to the outer surface of the holder member. 4. The method of claim 1 or 3,
The first support portion is a lens driving device including a curved shape. 4. The method according to any one of claims 1 to 3,
and a second elastic member connecting the lower portion of the holder member and the lower portion of the bobbin,
The first elastic member connects the upper portion of the holder member and the upper portion of the bobbin,
The first damping member is spaced apart from the second elastic member. 4. The method according to any one of claims 1 to 3,
The first damping member is a lens driving device spaced apart from the bobbin. 3. The method of claim 1 or 2,
Base; and
a second coil disposed on the base and interacting with the first magnet;
The holder member is a lens driving device disposed on the base. 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 3.

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