KR102376814B1 - Lens moving unit and camera module having the same - Google Patents

Abstract

The lens driving device according to this embodiment includes a bobbin in which at least one lens is installed and a coil unit is disposed on an outer circumferential surface; a cover member on which a magnet is installed at a position corresponding to the coil unit; upper and lower elastic members each having one end coupled to an upper surface and a lower surface of the bobbin to elastically support movement of the bobbin in a direction parallel to the lens optical axis direction; and a sensing unit for detecting a movement in a direction parallel to the optical axis of the bobbin, wherein the sensing unit includes: a sensing magnet installed on an outer circumferential surface of the bobbin; and a position sensing sensor installed on the side wall of the cover member and facing the sensing magnet, wherein the bobbin includes a correction magnet installed opposite to the position where the sensing magnet is installed; may further include.

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.

Recently, in order to shorten the auto-focusing time of the camera module, there is a demand for the development of a lens driving device that receives feedback on the position information of the bobbin in which the lens is installed and quickly grasps the optimal focusing position. The performance of the lens driving device may deteriorate, such as the eccentricity of the barrel.

The present embodiment provides a lens driving device capable of receiving feedback on position information of a bobbin and a camera module having the same.

The lens driving device according to this embodiment includes a bobbin in which at least one lens is installed and a coil unit is disposed on an outer circumferential surface; a cover member on which a magnet is installed at a position corresponding to the coil unit; upper and lower elastic members each having one end coupled to an upper surface and a lower surface of the bobbin to support movement of the bobbin in a lens optical axis direction; and a sensing unit for sensing a movement in a direction parallel to the optical axis of the bobbin, wherein the sensing unit includes: a sensing magnet installed on an outer circumferential surface of the bobbin; and a position sensing sensor disposed on the side wall of the cover member and facing the sensing magnet, wherein the bobbin includes a correction magnet installed on the opposite side of the position where the sensing magnet is installed; may further include .

The cover member may be formed of a ferromagnetic material.

The bobbin may be disposed at a position where the sensing magnet does not interfere with the coil unit.

The sensing magnet may be disposed below the coil unit.

An imaginary line connecting the centers of the first and correction magnets may pass through the center of the bobbin.

The first and correction magnets may be disposed so as not to face the magnets.

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 camera module according to the present embodiment includes an image sensor; a printed circuit board on which the image sensor is mounted; and a lens driving device configured as described above.

By installing a sensing magnet on the outer surface of the bobbin, the position of the sensing magnet can be detected with a position sensor such as a hall sensor, so that the position of the bobbin during autofocusing operation can be accurately identified.

In addition, since the attractive force formed between the sensing magnet attached to the bobbin and the metal cover member is offset by the attractive force formed between the sensing magnet and the compensation magnet installed on the opposite side of the cover member, it is possible to prevent the bobbin from being biased toward the cover member. can

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 and 4 are enlarged perspective views of the bobbin of FIG. 2;
Figure 5 is a front view of Figure 1;
Fig. 6 is a sectional view II of Fig. 5;
7 is a schematic cross-sectional view of a lens driving device according to another embodiment;
Fig. 8 is a schematic II-II cross-sectional view of Fig. 7;
9 is a schematic diagram of a unidirectional control lens driving device, and
10 is a schematic diagram of a bidirectional control lens driving device.

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, Figures 3 and 4 are an enlarged perspective view of the bobbin of Figure 2, Figure 5 is a front view of Figure 1, 6 is a cross-sectional view II of FIG. 5, FIG. 7 is a schematic cross-sectional view of a lens driving device according to another embodiment, FIG. 8 is a schematic II-II cross-sectional view of FIG. 7, FIG. 9 is a schematic view of a unidirectional control lens driving device, and , Fig. 10 is a schematic diagram of a bidirectional control lens driving device.

1 and 2 , the lens driving apparatus according to the present embodiment may include a base 20 , a bobbin 30 , and a cover member 60 . Although the cover member 60 may form the outside of the camera module, as shown, a housing member 40 supporting a magnet 41 to be described later may be further disposed inside the cover member 60 . .

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 coil unit 31 installed on its 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. The upper elastic member 51 has one end connected to the bobbin 30 , and the other end may be coupled to the cover member 60 or the housing member 40 , and when coupled to the housing member 40 , the upper portion of the housing member It may be coupled to the surface or the lower surface. 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 housing 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 The lower elastic member 52 may be fixed by coupling, and rotation may be prevented. In addition, an adhesive or the like may be added for firm fixation.

On the other hand, the upper elastic member 51 is composed of a single body as shown in FIG. 2, and the lower elastic member 52 is provided with two springs in a two-division structure, and can serve as a terminal to receive current. there is. That is, a current applied through a terminal (not shown) is transmitted through two springs of the lower elastic member 52 , and this current may be applied to the coil unit 31 wound around the bobbin 30 . To this end, the lower elastic member 52 and the coil unit 31 may be electrically connected to each other by soldering or the like. That is, the two springs and both ends of the coil unit 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 on the contrary, the upper elastic member 51 is formed in a two-part structure, and it is also possible that the lower elastic member 52 is integrally configured.

Bidirectional movement of the bobbin 30 in the optical axis direction may be supported by the upper and lower elastic members 51 and 52 . That is, since the bobbin 30 is spaced apart from the base 20 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, since the initial position of the bobbin 30 becomes the upper surface of the base 20 , the movement may be controlled only upward based on the initial position of the bobbin 30 .

Meanwhile, the coil unit 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. 3 , the coil unit 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 according to the shape of the bobbin 30 . .

Alternatively, the coil unit 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 coil unit 31 is flat. However, the present invention is not limited thereto, and the surface of the magnet 41 and the surface of the coil unit 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 second rounded surface formed on a surface corresponding to the curved surface so that the coil unit 31 can be coupled to the outer peripheral surface. It may include a surface, but the second surface may be a flat surface. At this time, a recess 33 corresponding to the inner yoke 61 to be described later may be formed on the upper side of the second surface, and the coil unit 31 may be disposed below the recess 33, but the coil unit 31 ) may be disposed up to a portion of the groove (33) in the vicinity. However, the present invention is not limited thereto, and a separate yoke may be installed instead of the inner yoke 61 .

The housing 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 to the upper and lower surfaces of the housing member 40 may be provided, and a magnet 41 may be installed on the side surface. At this time, as shown in FIG. 2, a mounting hole 42a in which the magnet 41 is installed may be formed, and the magnet 41 may be disposed in the mounting hole 42a and fixed to the cover member 60, The present invention is not limited thereto, and the magnet 41 may be directly adhesively fixed to the inner circumferential surface of the housing member 40 without the mounting hole 42a. As such, when the magnet 41 is directly fixed to the housing member 40 , the magnet 41 may be directly bonded and fixed to a side surface or a corner of the housing member 40 .

In addition, the housing member 40 may be additionally provided with a through hole (42b) in addition to the mounting hole (42a), the through hole (42b) may be formed to face each other as a pair as shown, but is not limited thereto. . That is, a through hole 42b larger than the size of the sensing magnet 100 may be formed in a wall surface of the housing member 40 facing the sensing magnet 100 to be described later. At this time, the through hole (42b) may be a square, it may be provided in a circular or polygonal shape. Alternatively, by using the existing housing member 40 having four mounting holes 42a as it is, the magnet 41 may be installed in the two mounting holes 42a, and the remaining two may be used as the through holes 42b. .

In addition, unlike the embodiment, there may be only the cover member 60 without a separate housing 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 . In this case, the cover member 60 may have a rectangular shape as shown in FIG. 1 , or may be provided in an octagonal shape although not shown. In addition, when the cover member 60 has an octagonal shape when viewed from the top, if the shape of the magnet 41 disposed at the edge of the housing member 40 is trapezoidal when viewed from the top, the magnetic field emitted from the edge of the housing member can be minimized

The cover member 60 may be integrally formed with an inner yoke 61 at a position corresponding to the receiving groove. According to this embodiment, the inner yoke 61 has one side of the coil unit 31 . It may be spaced apart from the bobbin by a certain distance, and the other side may be disposed to be spaced apart from the bobbin 30 by a certain distance. Also, the inner yoke 61 may be formed at four corners of the housing member 40 . The inner yoke 61 may be bent inward from the upper surface of the cover member 60 in a direction parallel to the optical axis. Although not shown, an escape groove may be formed in the inner yoke 61 at a position close to the bent portion. These escape grooves may be formed as a pair or symmetrically, and the bent portion where the escape groove is formed forms a bottleneck section. Due to this escape groove forming section, when the bobbin 30 moves up and down, the inner yoke 61 and the bobbin ( 30) can be minimized. That is, it is possible to prevent the bobbin 30 from being partially damaged due to the interference of the edge of the inner yoke when the bobbin 30 moves upward. The end of the inner yoke 61 needs to be spaced apart from the bottom surface of the groove 33 at a reference position by a certain distance, which is the highest position when the bobbin 30 reciprocates. This is to prevent contact or interference between the end of the groove and the bottom surface of the groove 33 . In addition, the end of the inner yoke 61 may serve as a stopper for regulating the movement of the bobbin 30 to a section other than the design specification. In addition, when there is no separate housing member 40 , the magnet 41 may be directly bonded and fixed to the side or corner of the cover member 60 . Also, the magnetization direction of the magnet 41 may be a side facing the bobbin 30 and a side facing the cover member 60 . However, the present invention is not limited thereto, and the magnetization direction may be changed according to design.

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 position sensing sensor 110 . Here, the position sensor 110 may be installed on the circuit board 111 .

The sensing magnet 100 may be configured to be smaller and thinner than the magnet 41, and may be provided in a square shape as shown. However, the present invention is not limited thereto, and various configurations such as a rectangle, 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 the present embodiment, it may be fixed to the sensing magnet mounting part 35 provided on the bobbin 30 with an adhesive or the like. At this time, the sensing magnet mounting part 35 may include a rib-shaped guide protruding from the outer circumferential surface of the bobbin 30 , but is not limited thereto, and a groove in which the sensing magnet 100 can be disposed is formed. may be The rib-shaped guide may have an opening at the lower side as shown in FIG. 3 , and may be provided to surround at least three surfaces of the sensing magnet 100 . In this case, the protrusion height of the guide of the sensing magnet mounting part 35 may correspond to the thickness of the sensing magnet 100 , or may be formed to be lower or higher. Therefore, when the sensing magnet 100 is fixed to the sensing magnet mounting part 35 with an adhesive or the like, the sensing magnet 100 may or may not protrude out of the guide.

The sensing magnet 100 may be disposed at a position that does not interfere with the coil unit 31 . That is, when the coil unit 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 coil unit 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 coil unit 31 and the bobbin 30 , or on the upper surface of the coil unit 31 opposite to the cover member 60 or the housing member 40 . may be placed.

As shown in FIG. 2 , the sensing magnet 100 may be disposed so as not to face the magnet 41 . That is, two magnets 41 are provided as a pair, and are arranged to face each other while being parallel to each other. In this case, when the housing member 40 is provided in a rectangular shape, the sensing magnet 100 may not be installed at a position facing the two surfaces on which the magnet 41 is installed. 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, and the position detection sensor 110 This is so that the movement of the bobbin 30 can be accurately fed back. 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 position detecting sensor 110 detects the vertical movement of the sensing magnet 100 , thereby accurately measuring the vertical movement of the bobbin 30 . can figure out

As shown in FIG. 2 , the circuit board 111 may be disposed to correspond to each sidewall of the bobbin 30 , the housing member 40 and/or the cover member 60 . In the present embodiment, a cover member 60 serving as a shield can may be provided, and the circuit board 111 may be in contact with or disposed on a sidewall of the cover member 60 . In addition, as shown in FIGS. 7 and 8 , the circuit board 111 may be in contact with or fixed to the outer or inner surface of the cover member 60 or the housing member 40 .

On the other hand, when disposed outside the cover member 60 of the circuit board 111 , it is formed to be larger than the window 62 formed in the cover member 60 to cover the window 62 . In addition, the circuit board 111 may include a terminal 112 at one end so as to be electrically connected to the printed circuit board 10 on which the image sensor 11 to be described later is mounted. In addition, in order to apply a current to the coil unit 31 through the circuit board 111, the coil unit 31 is directly electrically connected to the circuit board 111, or the coil unit 31 is divided into two. After being connected to the lower spring, the two lower springs may be electrically connected to the circuit board 111 to be electrically connected to the printed circuit board 100 . Various methods such as soldering, conductive epoxy, Ag epoxy, etc. are possible for the electrical connection method. In addition, the circuit board 111 may be electrically connected to the printed circuit board (!0), which is a component of the camera module, to receive external power.

At this time, since the position sensing sensor 110 such as a Hall sensor is disposed on the inner surface of the circuit board 111 , the position sensing sensor 110 is not exposed to the outside. In addition, a window 62 may be provided on the sidewall of the cover member 60 corresponding to the position sensing sensor 110, and a through hole 42b is also formed in the housing member 40, so that the position sensing sensor ( 110 , passing through the window 62 , may be disposed to be spaced apart from the sensing magnet 100 by a predetermined distance. At this time, the through hole 42b formed in the housing member 40 may be provided in a shape corresponding to the mounting portion 42a for installing the magnet 41 , and a through hole having a width and a height greater than that of the sensing magnet 100 . may be provided as In addition, the circuit board 111 on which the position sensor 110 is disposed may be fixed to the inner surface of the cover member 60 , and in this case, a window may not be formed in the cover member 60 . there is. In addition, the housing member 40 may be absent, and the center of the position detection sensor 110 and the center of the sensing magnet 100 may coincide.

In addition, a plurality of terminals 112 may be provided on the circuit board 111 . This terminal 112 may be for outputting a detection signal of the position detection sensor 110 or for applying a current to the coil unit 31 .

According to the present embodiment as described above, since the movement of the bobbin 30 in the optical axis direction can be fed back using the sensing magnet 100 , the time required for the auto-focusing operation can be shortened.

In addition, the coil unit 31 operates in a wound state on the bobbin 30, attaches a sensing magnet 100 smaller than the magnet for autofocusing to the bobbin 30, and detects the magnetic force of the sensing magnet 100. Since the possible position sensor 110 is arranged in close contact with the wall of one side of the lens driving device, it is possible to perform the auto-focusing function more precisely and quickly without fear of deterioration of the response characteristic.

In addition, the center of the position detecting sensor 110 and the center of the sensing magnet 100 may coincide, and the center of the vertical length (the two magnetized parts) of the sensing magnet 100 is the center of the position detecting sensor 110 . can be placed in line with In addition, the sensing magnet 100 may have a surface opposite to the position sensing sensor 110 magnetized into two parts, so that position sensing may be possible.

In addition, the vertical length of the through hole 42b and/or the window 62 may be formed to be larger than the space of the sensing magnet 100 and/or the size of the position sensing sensor 110 moving in the vertical direction of the bobbin 30. can

The position sensor 110 may be any sensor capable of detecting a position, such as a gyro sensor, an angular velocity sensor, an acceleration sensor, or a photo reflector.

In addition, as shown in FIGS. 2 to 4 and 6 , a correction magnet 200 may be installed on a surface of the bobbin 30 opposite to the surface on which the sensing magnet 100 is installed.

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 the correction magnet mounting part 36 provided on the bobbin 30 with an adhesive or the like. At this time, the correction magnet mounting part 36 may include a rib-shaped guide protruding from the outer circumferential surface of the bobbin 30, but is not limited thereto, and a groove in which the correction magnet 200 can be disposed is formed. may be The rib-shaped guide may have an opening at the lower side as shown in FIG. 4 , and may be provided to surround at least three surfaces of the correction magnet 200 . In this case, the protrusion height of the guide of the correction magnet mounting part 36 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 36 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 forces (arrows A and B) (refer to FIG. 8) formed between the sensing magnet 100, the correction magnet 200, and the cover member 60 are offset from each other, and the center of the bobbin 30 is It is not biased toward the cover member 60 side. That is, as shown in FIG. 8, the attractive force formed by the magnetic force formed between the sensing magnet 100 and the cover member 60 is 'A', and the attractive force between the correction magnet 200 and the cover member 60 is 'B'. ', because it is formed so that A = B. 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 position sensor 110 may be disposed on the edge of the cover member 60 corresponding to the sensing magnet 100 .

Meanwhile, the position sensor 110 may be installed alone, or as shown in FIGS. 1 to 6 , a predetermined circuit board 111 may be provided and mounted therein. At this time, the circuit board 111 may be exposed to the outside of the cover member 60 as shown in FIGS. 1 to 6 , and is embedded inside the cover member 60 as shown in FIGS. 7 and 8 . The furnace position sensor 110 may be installed. Alternatively, although not shown, the circuit board 111 may be installed on the inner surface or corner of the cover member 60 . In addition, it is also possible to supply current to the coil unit 22 wound on the bobbin 30 through the circuit board 111 .

As described above, the sensing magnet 100 is attached to the outer wall of the bobbin 30 , and a position sensing sensor 110 capable of detecting the magnetic force of the sensing magnet 100 is disposed on one wall of the cover member 60 . Thus, the position of the bobbin 30 can be fed back in real time, so that it is possible to perform an auto-focusing function more quickly and accurately than a conventional lens driving device.

In particular, correction having the same size and magnetic force as the sensing magnet 100 so that the bobbin 30 is not eccentric toward the cover member 60 due to the generation of attractive force between the sensing magnet 100 and the magnetic cover member 60 . Since the magnet 200 is installed on the opposite side of the bobbin 30 in a center-aligned state, the bobbin 30 can always maintain a constant position with respect to the center of the cover member 60 .

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 8 can perform unidirectional control as shown in FIG. 9 and bidirectional control as shown in FIG. Do.

That is, as shown in FIG. 9 , the base 20 and the bobbin 30 may be closely disposed at an initial position. For example, the stopper 25 may protrude from the side of the base 20 to form an initial position in contact with the bottom surface of the bobbin 30 , and conversely, although not shown, the bottom surface of the bobbin 30 . It is also possible to protrude a stopper to the side, so that the stopper is disposed in contact with the upper surface of the base 20 . In this 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, so that power is applied In this case, the bobbin 30 rises in the direction of arrow C by electromagnetic interaction, and when the power is cut off, it can return to its initial position by the restoring force of the upper and lower elastic members 51 and 52 . .

Alternatively, as shown in FIG. 10 , the base 20 and the bobbin 30 may be spaced apart from the initial position by a predetermined distance g. 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 (g), when power is applied, depending on the polarity of the applied current, for example, when a constant current is applied, based on the initial position It may rise in the direction of arrow C, or when reverse current is applied, it may descend in the direction of arrow D based on the initial position.

In this way, in performing the auto-focusing function by moving the bobbin 30 in the direction of the arrow C or D, the present embodiment can use the sensing magnet 100 to confirm a more accurate position of the bobbin 30, The time required for the focusing operation may 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 32 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 32 in which at least one lens 32a is installed. It may be formed so as to be screw-coupled to the. However, this is not limited, and although not shown, the lens barrel 32 is directly fixed to the inside of the bobbin 30 by a method other than screwing, or the one or more lenses 32a without the lens barrel 32 are It is also possible to be formed integrally with the bobbin. The lens 32a may be configured as one sheet, or two or more lenses may be configured to form an optical system.

In the base 20 , an infrared cut filter 21 (see FIG. 7 ) may be additionally installed at a position corresponding to the image sensor 11 , and may be coupled to the housing member 40 . In addition, the lower side of the housing 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 30; bobbin
31; coil unit 32; lens barrel
40; housing members 51, 52; Upper and lower elastic members
60; cover member 100; sensing magnet
110; position sensor 111; circuit board
112; terminal 200; Calibration Magnet

Claims (21)

cover member;
a bobbin disposed to move in the optical axis direction within the cover member;
a driving magnet disposed on the cover member;
a coil disposed on the bobbin and facing the driving magnet;
a base disposed under the bobbin and coupled to the cover member;
a sensing magnet disposed on the bobbin;
a sensor for detecting the sensing magnet;
a correction magnet disposed on the bobbin opposite to the sensing magnet;
a circuit board including a plurality of terminals; and
It includes a lower elastic member coupled to the lower portion of the bobbin,
The sensor is disposed on the circuit board,
The lower elastic member includes a first spring and a second spring spaced apart from each other,
The first spring is electrically connected to one end of the coil and the second spring is electrically connected to the other end of the coil;
The first and second springs are electrically connected to the circuit board. According to claim 1,
The cover member includes an upper plate and a side plate extending from the upper plate,
The side plate of the cover member includes a first side plate and a second side plate disposed opposite to each other, and a third side plate and a fourth side plate disposed opposite to each other,
The driving magnet includes a first magnet disposed on the first side plate of the cover member, and a second magnet disposed on the second side plate of the cover member,
The driving magnet is not disposed on the third side plate and the fourth side plate of the cover member. 3. The method of claim 2,
The sensing magnet is disposed on the first surface of the bobbin corresponding to the third side plate of the cover member,
The correction magnet is disposed on a second surface of the bobbin corresponding to the fourth side plate of the cover member. According to claim 1,
The driving magnet includes a pair of magnets,
The pair of magnets are arranged parallel to each other,
The plurality of terminals are disposed at the lower end of the circuit board. According to claim 1,
The sensing magnet and the correction magnet are disposed at positions that do not face the driving magnet,
The sensing magnet and the correction magnet are smaller than the driving magnet. 4. The method of claim 3,
In a direction perpendicular to the third side plate, the sensing magnet does not overlap the third side plate of the cover member. According to claim 1,
The cover member is formed of a metal,
The cover member includes an inner yoke integrally formed,
The inner yoke includes four inner yokes,
The four inner yokes are respectively disposed at positions corresponding to the four corners of the cover member,
The bobbin includes a groove disposed at a position corresponding to the inner yoke,
One side of the inner yoke is spaced apart from the coil and the other side of the inner yoke is spaced apart from the bobbin. 8. The method of claim 7,
The cover member includes an upper plate and a side plate extending from the upper plate,
The inner yoke is bent from the upper plate of the cover member,
The inner yoke is a lens driving device including an escape groove formed adjacent to the bent portion of the inner yoke. 4. The method of claim 3,
The circuit board is a lens driving device disposed on an outer surface of the third side plate of the cover member. According to claim 1,
At least a portion of the circuit board is disposed on a side surface of the base. According to claim 1,
The sensing magnet may include a surface facing the coil in the optical axis direction or may be in contact with the coil. According to claim 1,
The sensing magnet is a lens driving device disposed above or below the coil. According to claim 1,
In a direction in which the sensing magnet faces the correction magnet, the sensing magnet and the correction magnet do not overlap the driving magnet. According to claim 1,
The sensor includes a Hall sensor,
The bobbin includes a sensing magnet mounting portion formed on the outer peripheral surface of the bobbin,
The sensing magnet is disposed in the sensing magnet mounting unit such that at least three surfaces of the sensing magnet are surrounded by the sensing magnet mounting unit,
The sensing magnet is fixed to the sensing magnet mounting part by an adhesive,
The sensing magnet does not protrude from the outer peripheral surface of the bobbin. a cover member including an upper plate and a side plate extending from the upper plate;
a bobbin disposed in the cover member;
a driving magnet disposed on the cover member;
a coil wound along an outer circumferential surface of the bobbin and facing the driving magnet;
a base disposed under the bobbin and coupled to the cover member;
a lower elastic member connecting the bobbin and the base;
a sensing magnet and a correction magnet disposed on the bobbin and disposed opposite to each other;
a circuit board including a plurality of terminals; and
and a sensor disposed on the circuit board and detecting the sensing magnet,
The lower elastic member includes a first spring and a second spring spaced apart from each other,
The first spring is connected to one end of the coil and the circuit board,
The second spring is connected to the other end of the coil and the circuit board,
The driving magnet is disposed on two side plates facing each other of the cover member,
The two side plates do not overlap an imaginary straight line connecting the sensing magnet and the correction magnet. 16. The method of claim 15,
The sensing magnet and the correction magnet are disposed at positions that do not face the driving magnet,
The sensing magnet and the correction magnet are smaller than the driving magnet. 16. The method of claim 15,
The cover member is formed of a metal,
The cover member includes an inner yoke integrally formed,
The inner yoke includes four inner yokes,
The bobbin includes a groove disposed at a position corresponding to the inner yoke,
One side of the inner yoke is spaced apart from the coil and the other side of the inner yoke is spaced apart from the bobbin. 16. The method of claim 15,
The cover member includes first to fourth corners,
The driving magnet includes a first magnet disposed between the first corner and the second corner, and a second magnet disposed between the third corner and the fourth corner,
The driving magnet is not disposed between the second corner and the third corner and between the fourth corner and the first corner,
The sensing magnet and the correction magnet are disposed so as not to overlap the driving magnet in a direction in which the sensing magnet faces the correction magnet. 16. The method of claim 15,
The circuit board is a lens driving device disposed on the side plate of the cover member. cover member;
a bobbin disposed in the cover member;
a driving magnet disposed on the cover member;
a coil wound along an outer circumferential surface of the bobbin and facing the driving magnet;
a lower elastic member coupled to a lower surface of the bobbin;
a sensing magnet and a correction magnet disposed on the bobbin and disposed opposite to each other;
a circuit board including a plurality of terminals; and
and a sensor disposed on the circuit board and detecting the sensing magnet,
The lower elastic member includes a first spring and a second spring spaced apart from each other,
The first spring is coupled to one end of the coil and is electrically connected to the circuit board,
The second spring is coupled to the other end of the coil and is electrically connected to the circuit board,
wherein the driving magnet meets the correction magnet in a direction parallel to the optical axis and the optical axis and does not overlap in a direction perpendicular to the optical axis. printed circuit board;
an image sensor disposed on the printed circuit board;
The lens driving device of any one of claims 1 to 20 disposed on the printed circuit board; and
and a lens coupled to the bobbin of the lens driving device,
The plurality of terminals of the circuit board are electrically connected to the printed circuit board.

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