KR20220037429A - Lens moving unit and camera module having the same - Google Patents

Abstract

According to an embodiment of the present invention, a lens driving device having a first lens driving unit for auto-focusing and a second lens driving unit for image stabilization comprises: a base; a holder member, where a magnet is installed, spaced from an upper side of the base at a predetermined interval; a plurality of support members elastically supporting the holder member with respect to the base; a first stopper protruding from an upper surface of the holder member; and a second stopper protruding from a lower surface of the holder member to form an impact point between the base and the holder member when a collision occurs.

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 may be configured in various ways, and a first lens driving device using a voice coil unit motor and a second lens driving device for correcting hand shake may be simultaneously provided.

The first lens driving device may perform an auto-focusing function by operating by electromagnetic interaction of a coil unit wound on an outer circumferential surface of a bobbin to which a magnet fixed to the holder member and a lens barrel are coupled. 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.

The second lens driving device is for correcting hand shake, and may be configured to shift the entire first lens driving device in a direction perpendicular to the optical axis. In this case, the second lens driving device may be elastically supported by a plurality of elastically deformable support members, and the support member is formed of a plurality of wires to form a corner or a side wall of a holder member constituting the second lens driving device. The support member may be connected to the back.

However, in the lens driving device having the camera shake correction function having such a configuration, when an external impact occurs, the holder member may collide with the cover member or the base. In general, the impact applied to the lens driving device is concentrated on either edge or side of the asymmetrically applied impact, such as a fall, so when an impact applied to a specific location occurs, the holder member moves beyond the design value, It may cause deformation of the support member composed of a wire or the like. If the support member is deformed in this way, the hand shake correction control may not be normally performed, and the optical system may not be properly aligned with the optical axis, and thus a correct image may not be obtained.

The present embodiment provides a lens driving device having an improved structure so as to minimize the occurrence of deformation of the support member even in an external impact, and a camera module having the same.

A lens driving device according to the present embodiment is a lens driving unit including a first lens driving unit for auto-focusing and a second lens driving unit for hand-shake correction, the lens driving unit comprising: a base; a holder member disposed on the upper side of the base at regular intervals and having a magnet installed therein; a plurality of support members elastically supporting the holder member with respect to the base; a first stopper protruding from the upper surface of the holder member; and a second stopper protruding from the lower surface of the holder member to form an impact point between the base and the holder member when an impact occurs.

Further comprising a circuit board on which a pattern coil unit is disposed at a position corresponding to the magnet, wherein the circuit board includes a first circuit board made of an FPCB and a second circuit board including a pattern coil unit made of an FP coil. may include

The distance between the second stopper and the base may be equal to or smaller than an air gap between the pattern coil unit and the magnet.

At the impact point formed between the second stopper and the base, an impact modifier including any one of a poron and a damper may be interposed.

At least one third stopper protruding from the upper edge of the holder member may be further included.

The second stopper may be disposed adjacent to the support member.

In addition, the second stopper may be formed to protrude at a position that does not interfere with the pattern coil unit.

Also, the second stopper may be disposed so as not to overlap an imaginary line passing through the first stopper.

In this case, the first stopper may protrude from an upper surface of each wall surface of the holder member, and the second stopper may protrude toward the base on a lower surface of a corner portion of the holder member.

The first stopper may be spaced apart from the cover member coupled to the base to have the same size as the movement amount of the second lens driving device.

At least one support member may be installed at each corner of the circuit board and the holder member.

In addition, the support member is composed of a wire member, and may be installed two at each corner of the circuit board and the holder member.

In addition, the support member and the second stopper may be disposed so as not to interfere with each other.

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 lens driving device configured as described above.

According to the present embodiment as described above, at least one first stopper and a second stopper capable of regulating a movement path are protrudingly formed on the upper and lower surfaces of the holder member surrounding the bobbin in which the plurality of lenses are installed, Even when a sudden external shock occurs, since the holder member is prevented from moving over a certain distance, deformation of the support member supporting the holder member can be minimized.

In addition, even if it receives an impact from either side or corner of the holder member, it is possible to prevent the deformation of the support member of either edge because the first and second stoppers block the inclined movement to the impacted part. .

1 is a perspective view of a lens driving device according to the present embodiment;
Figure 2 is a side view of Figure 1, and,
3 is a graph showing the frequency response characteristics of the lens driving device according to the present embodiment and the conventional lens driving device.

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

1 is a perspective view of a lens driving device according to this embodiment, FIG. 2 is a side view of FIG. 1, and FIG. 3 is a graph showing frequency response characteristics of the lens driving device according to the present embodiment and the conventional lens driving device.

1 and 2 , the lens driving device according to the present embodiment may include first and second lens driving units, the first lens driving unit being a lens driving unit for autofocus, and the second The lens driving unit may be a lens driving unit for image stabilization.

The first lens driving unit may include a base 10 , a bobbin 30 , and a holder member 40 .

At least one circuit board may be installed on an upper side of the base 10, and a pattern coil for operating the second lens driving unit may be installed on the circuit board. In addition, it may further include a cover member 60 to form the outer periphery of the camera module and, as shown, the holder member 40 for supporting a plurality of magnets can be disposed inside.

The base 10 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 coil unit installed in a coil seating portion formed on an outer peripheral surface thereof, and the coil unit elevates the bobbin 30 in a direction parallel to the optical axis by electromagnetic interaction with the plurality of magnets. can be lowered

The bobbin 30 may be provided with the upper and lower elastic members at upper and lower portions, respectively. One end of the upper elastic member 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 may be connected to the bobbin 30 , and the other end may be coupled to the upper surface of the base 10 or the lower surface of the holder member 40 . In addition, a protrusion for coupling the lower elastic member may be formed on the lower side of the base 10, and a hole or a recess is formed at a position corresponding to the lower elastic member, so that the lower elastic member is formed by combining them. It may be fixed, and rotation may be prevented. In addition, an adhesive or the like may be added for rigid fixation, and the projection and the elastic member may be combined by heat sealing or the like.

On the other hand, the upper elastic member is provided with two leaf springs in a two-part structure, and the lower elastic member is composed of one body, and may serve as a terminal to receive current. That is, the current applied through the terminal 21a is transmitted through the two springs of the upper elastic member, and this current may be applied to the coil unit wound on the bobbin 30 . To this end, the upper elastic member and the coil unit may be connected to each other so as to be energized by soldering or the like. Here, the upper elastic member includes an outer portion coupled to the holder member, an inner portion coupled to the bobbin, and a connecting portion connecting the inner portion and the outer portion, and the inner portion may be electrically connected to both ends of the first coil through soldering, etc. . That is, the two springs and both ends of the coil unit 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. Conversely, it is also possible that the lower elastic member is formed in a two-division structure, and the upper elastic member is integrally configured. Alternatively, the upper elastic member 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. 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, so that the movement can be controlled only upwards based on the initial position of the bobbin 30 .

Meanwhile, the coil unit 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 coil unit may be installed in a position close to the lower surface of the bobbin 30 , and may include a straight surface or a curved surface according to the shape of the bobbin 30 .

Alternatively, the coil unit 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 magnets disposed to face each other. If the corresponding surface of the magnet is flat, the electromagnetic force can be maximized when the face of the facing coil unit is flat. However, the present invention is not limited thereto, and the surface of the magnet and the surface of the coil unit may be all curved, all flat, or one curved surface and the other flat surface according to design specifications.

In addition, the bobbin 30 includes a first surface formed flat on a surface corresponding to the straight surface and a second surface formed to be rounded on a surface corresponding to the curved surface so that the coil unit can be coupled to the outer peripheral surface. However, 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 may be provided on the upper surface and the lower surface of the holder member 40, respectively, and magnets may be installed on the four corners or the four side surfaces. In this case, a seating portion (not shown) may be formed at a position where the magnet is installed. However, the present invention is not limited thereto, and the magnet may be directly adhesively fixed to the inner circumferential surface of the holder member 40 without a seating portion. As such, when the magnet is directly fixed to the holder member 40 , the magnet may be directly bonded and fixed to the side or corner of the holder member 40 . In addition, unlike the embodiment, in the case of an auto focusing unit rather than a hand shake correction unit, 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 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 FIG. 2 , or may be provided in an octagonal shape although not shown. In addition, when the cover member 60 is octagonal when viewed from the top, if the shape of the magnet disposed at the edge of the holder member 40 is trapezoidal when viewed from the top, the magnetic field emitted from the edge of the holder member 40 is can be minimized

The first lens driving unit may be configured as described above, and may be replaced with an optical system that implements other types of auto-focusing functions 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, any optical actuator capable of performing an auto-focusing function may be used as the first lens driving unit.

On the other hand, the second lens driving unit is a lens driving unit for hand-shake correction, and may include a first lens driving unit, a base 10, a support member 50, a circuit board 20, and a position detection sensor not shown. there is.

The circuit board 20 may include a first circuit board on which a position detection sensor is installed, and a pattern coil unit 21 . However, the present invention is not limited thereto, and the first circuit board and the pattern coil may be formed of a single circuit board. In this embodiment, it is composed of first and second circuit boards separated from each other, the second circuit board is formed of an FP coil that is a pattern coil, and the second circuit board is laminated on the upper surface of the first circuit board, It can be electrically connected. Meanwhile, the pattern coil unit 21 may be assembled to the circuit board 20 as individual parts. In this case, the circuit board may be provided as an FPCB, and may be installed on the upper surface of the base 10 . The pattern coil unit 21 may move the entire first lens driving unit in a plane direction perpendicular to the optical axis through interaction with the magnet. The pattern coil unit 21 is disposed on the circuit board 20 at a position corresponding to the bottom surface of the magnet in a patterned coil manner. For example, when the magnet is installed on each wall portion of the holder member 40, the pattern coil The unit 21 may be disposed on each side of the circuit board 20 corresponding to each other.

The position sensor may be installed on the circuit board 20 , but is not limited thereto, and may be separately disposed as a separate component, or may be integrally configured on the circuit board 20 . The position sensor detects the magnetic field of the magnet, and may detect a movement in a direction perpendicular to the optical axis of the holder member 40 in which the magnet is installed.

On the other hand, the lens driving device according to the present embodiment has the first and/or second surfaces on the upper and lower surfaces of the holder member 40 so as to minimize damage to the support member 50 when a sudden external shock occurs. Stoppers 100 and 200 may be disposed, and a third stopper 300 may be further provided.

A plurality of first stoppers 100 may protrude from the upper surface of the holder member 40 as shown in FIGS. 1 and 2 . According to the present embodiment, the first stopper 100 may be disposed approximately in the vicinity of the center of each surface of the holder member 40 . However, this is not limited thereto, and if necessary, it is possible to arrange two on each side. The first stopper 100 may be provided in a hexahedral shape, and the upper surface may be configured to be flat. As shown in FIG. 2 , the first stopper 100 may be disposed to be spaced apart from the cover member 60 by a predetermined distance g2 . In addition, the first stopper 100 may be configured to have the same size as the movement amount of the second lens driving device and to be spaced apart from the cover member (not shown).

As shown in FIGS. 1 and 2 , a plurality of second stoppers 200 may protrude from the lower surface of the holder member 40 . According to the present embodiment, the second stopper 200 may be disposed to be alternated with the first stopper 100 . For example, as shown in FIGS. 1 and 2 , an imaginary line passing through the center of the first stopper 100 and the second stopper 200 may be disposed so as not to overlap, the first stopper 100 is the holder When the member 40 is formed to protrude from the upper surface of each sidewall, the second stopper 200 may be formed to protrude one by one from each corner of the holder member 40 . However, the present invention is not limited thereto, and it can be formed anywhere as long as it is a configuration in which interference with surrounding components can be arranged. In the embodiment, the magnet may be disposed on each side portion of the inner surface of the holder member, and the second stopper 200 may be disposed at the corner.

According to this embodiment, the second stopper 200 is disposed at a corner portion that does not interfere with the pattern coil unit 21, and when the support member 50 is provided in a wire shape and disposed at each corner portion, It may be disposed at a position close to the wire-shaped support member 50 . That is, when the support member 50 for correcting hand shake is positioned in the diagonal direction, the second stopper 200 may be disposed at the edge of the holder member 40, and the support member 50 is positioned on each side. If arranged, it may be arranged at the corresponding position. However, the present invention is not limited thereto, and if it is a position where interference with the pattern coil unit 21 is excluded, it may be installed at any position. In addition, the support member 50 composed of a wire may be soldered through the hole of the circuit board as shown in FIG. 1 , but is not limited thereto, and may be connected to the upper surface of the first circuit board or the second circuit board by soldering. can

In addition, as shown in FIG. 2 , the second stopper 200 may be disposed to be spaced apart from the base 10 by a certain distance g1 , and the second stopper 200 has a point that becomes an impact point when impacting the lower side of the base. It may be configured to be the upper surface of (10) or the first circuit board or the second circuit board. At this time, the distance between the second stopper 200 and the impact point formed on the upper surface of the base 10 or the first circuit board or the second circuit board is equal to the distance between the pattern coil unit 21 and the magnet compared to the gap It is effective to prevent impact if it is formed to be smaller or smaller. Alternatively, a separate metal member disposed on the upper portion of the base may be an impact point. The metal member may be a yoke for concentrating magnetic flux, and in this case, the base, the metal member, and the circuit board may be sequentially disposed in the order. In this case, the second circuit board at the portion colliding with the second stopper 200 may escape, so that the second stopper 200 and the base 10 may be directly impacted. In this case, the pattern coil unit 21 or the circuit board including the second circuit board may be configured not to directly impact the second stopper 200 . In addition, an impact mitigating means such as a poron or a damper may be additionally interposed between the second stopper 200 and the impact point.

In addition, according to the present embodiment, the third stopper 300 may be further provided at the edge of the upper surface of the holder member 40 .

At least one third stopper 300 may be formed to protrude from the edge of the upper surface of the holder member 40 . According to this embodiment, as shown in FIG. 1 , the third stopper 3000 may be formed to protrude upward and sideways, respectively, on the upper surface of the edge portion of the holder member 40 . According to this embodiment, the third stopper 300 is disposed to be symmetrical, and may be installed in a total of four places at each corner. However, the present invention is not limited thereto, and two may be symmetrically disposed in a diagonal direction with respect to the center of the holder member 40 to form a pair.

According to the present embodiment, the third stopper 300 may serve as a stopper when the holder member 40 tilts or rotates during the hand shake correction process of the holder member 40 . . That is, in performing hand shake correction, when the holder member 40 is shifted in a direction perpendicular to the optical axis, the best image quality can be provided. When the 40) performs a tilting or rotating motion, since image quality may be rather deteriorated, the holder member 40 needs to regulate the tilting or rotating motion as much as possible. The third stopper 300 is disposed at the edge of the holder member 40 for this purpose, and through the interference between the upper side and the side wall of the inner surface of the cover member 60 shown in FIG. It is possible to prevent performing the same tilting and rotating behaviors. When the third stopper 300 is provided in this way, since the peak value in the frequency response characteristic for the rotation mode of the holder member 40 can be reduced, the Q value can also be reduced.

When the third stopper 300 is used together with the first stopper 100, it may be configured to be equal to or slightly smaller than the height of the first stopper, and is formed to protrude more than a certain size to the side of the holder member 40. , it may be provided so as to interfere with and collide with the inner peripheral surface of the side wall of the cover member 60 before the holder member 40 .

In addition, the third stopper 300 may also perform the function of the first stopper 100 described above. In this case, the first stopper 100 may be omitted. In this case, the height of the third stopper 300 may be equal to or higher than the height of the first stopper 100 .

As described above, when the first to third stoppers 100, 200, and 300 are provided on each or any one of the upper and lower surfaces of the holder member 40, the first and second stoppers ( 100 and 200 are in contact with the inner surface and/or the base of the cover member 60, since the holder member 40 is excessively repositioned because it serves as a stopper, it is possible to reduce the deformation of the support member 50 as much as possible. and the third stopper 300 may regulate the tilting and rotation of the holder member 40 .

3 is a graph showing the frequency response characteristics when the first and second stoppers 100 and 200 according to the present embodiment are applied. It is a graph, and (b) of FIG. 3 is a frequency response characteristic graph of the lens driving device according to the present embodiment.

As shown, according to this embodiment, the first to third stoppers 100, 200, and 300 of the holder member 40 perform upper stopping, tilting stopping, and rotation stopping, so hand shake correction is performed. It can be seen that the peak value is decreased in the frequency response characteristic for the rotation mode for the rotation mode, and through this, the Q value can be reduced.

Meanwhile, in the first lens driving device configured as described above, the base 10 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 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 10 by a predetermined distance, when power is applied, it may rise based on the initial position depending on the direction of the applied current, for example, when a constant current is applied. Also, when a reverse current is applied, it may descend based on the initial position.

The camera module may include a lens driving device configured as described above, a lens barrel coupled to the bobbin 30 , an image sensor, and a printed circuit board. In this case, the printed circuit board may have an image sensor mounted thereon and 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 inside 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 one sheet, or two or more lenses may be configured to form an optical system.

In the base 10 , an infrared cut-off 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 10 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 10 may function as a sensor holder to protect the image sensor, and in this case, a protrusion may be formed in a downward direction along the side surface of the base 10 . However, this is not an essential configuration, and although not shown, a separate sensor holder may be disposed under the base 10 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; base 20; circuit board
30; bobbin 40; holder member
50; support member 60; cover member
100; a first stopper 200; 2nd stopper
300; 3rd stopper

Claims (12)

a cover including an upper plate and a side plate extending from the upper plate;
a base coupled to the side plate of the cover;
a circuit board disposed on the base;
a holder member spaced apart from the base;
a bobbin disposed in the holder member;
an upper elastic member coupled to a protrusion protruding from an upper portion of the holder member;
a lower elastic member coupled to a protrusion protruding from a lower portion of the holder member; and
and a support member coupled to the upper elastic member and the circuit board,
The holder member includes a first stopper protruding from the upper surface and a second stopper protruding from the lower surface,
The holder member includes first and third sides opposite to each other, second and fourth sides opposite to each other, and a first edge formed by the first side and the second side,
The holder member includes a third stopper protruding from the first and second sides and the first corner,
The third stopper of the holder member prevents tilting of the holder member through interference with the inner surface of the upper plate of the cover and the inner surface of the side plate,
The second stopper is disposed inside the support member,
The first stopper extends from the first to fourth side surfaces of the holder member and is formed to protrude toward the upper surface,
The respective virtual lines passing through the first to third stoppers do not overlap each other. According to claim 1,
The holder member is provided with a magnet,
The circuit board is a lens driving device including a pattern coil unit at a position corresponding to the magnet. 3. The method of claim 2,
A distance between the second stopper and the base is equal to an air gap between the pattern coil unit and the magnet. 4. The method of claim 3,
A distance between the second stopper and the base is smaller than an air gap between the pattern coil unit and the magnet. According to claim 1,
A lens driving device in which any one of a poron and a damper is disposed at an impact point formed between the second stopper and the base. According to claim 1,
The second stopper is a lens driving device that is formed to protrude at a position that does not interfere with the pattern coil unit. According to claim 1,
The first stopper is a lens driving device that is formed to protrude from the upper surface of each side of the holder member. According to claim 1,
The support member is a lens driving device in which at least one is disposed at each corner of the circuit board and the holder member. 9. The method of claim 8,
The support member is composed of a wire member, and two lens driving devices are disposed at each corner of the circuit board and the holder member. 9. The method of claim 8,
The support member and the second stopper are disposed so as not to interfere with each other. According to claim 1,
The holder member includes a second corner formed by the first side and the fourth side, a third corner formed by the second side and the third side, and a fourth formed by the third side and the fourth side including edges;
The third stopper includes a 3-1 stopper protruding from the first and second sides and the first corner, and a 3-2 stopper protruding from the first and fourth sides and the second corner; , a lens driving including a 3-3 stopper protruding from the second and third sides and the third corner, and a 3-4 stopper protruding from the third and fourth sides and the fourth corner Device. The lens driving device according to claim 1; and
A camera module including an image sensor mounted on the circuit board.

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