Camera module with sensor shifting module

A sensor shifting module includes a fixed body; a first movable body, movably disposed in the fixed body, comprising an image sensor having an imaging plane opposite to a first direction; and a driver, configured to move the first movable body in a direction orthogonal to the first direction with respect to the fixed body, comprising a driving coil coupled to one of the fixed body and the first movable body, and a driving yoke coupled to another of the fixed body and the first movable body. The driving yoke is disposed to oppose the driving coil in the direction orthogonal to the first direction. When current is applied to the driving coil, the first movable body is configured to move in the direction orthogonal to the first direction by electromagnetic interaction between the driving coil and the driving yoke.

CROSS-REFERENCE TO RELATED APPLICATION(S)

This application claims the benefit under 35 USC 119(a) of Korean Patent Application No. 10-2021-0156565 filed on Nov. 15, 2021 in the Korean Intellectual Property Office, the entire disclosure of which is incorporated herein by reference for all purposes.

BACKGROUND

The following description relates to a camera module with sensor shifting module.

2. Description of Related Art

With the development of communications technology, mobile devices, such as smartphones, have been widely distributed. Accordingly, the demand for the functions of a camera included in mobile devices has also increased. For example, a camera included in a mobile device may be designed to provide advanced imaging functions (e.g., an autofocus function, an anti-shake function, and the like) implemented in a general DSLR camera despite the small size thereof.

The optical image stabilization function, that is, an optical image stabilization (OIS) function, may be provided to prevent image blur from occurring when a camera is shaken during the exposure time, and the OIS function may be desired when imaging in a low-light environment in which a camera is shaken and the exposure time is long. The OIS may include digital IS (DIS), electronic IS (EIS), and optical IS (OIS). Among these functions, optical IS (OIS) may fundamentally prevent image deterioration caused by shaking by correcting an optical path by moving a lens or image sensor in a direction orthogonal to the optical axis. Since a mechanical actuator may be desired, it may be complicated to implement as a device, and although relatively expensive, excellent compensation performance may be obtained.

A lens barrel may include an optical system therein, such that a relatively large amount of force may be required to drive the lens barrel. On the other hand, an image sensor may be relatively light and advantageous to implement an excellent OIS function even with a small force. However, when an actuator for driving the image sensor includes a permanent magnet, the magnetic field of the permanent magnet may affect neighboring electronic components. Also, when a mobile device includes a plurality of cameras disposed adjacently to each other, a permanent magnet in each camera may negatively affect the operation of the neighboring cameras, making it functionally difficult to dispose the cameras adjacent to each other or other electronic components in the camera.

SUMMARY

In one general aspect, a sensor shifting module includes a fixed body; a first movable body, movably disposed in the fixed body, comprising an image sensor having an imaging plane opposite to a first direction; and a driver, configured to move the first movable body in a direction orthogonal to the first direction with respect to the fixed body, comprising a driving coil coupled to one of the fixed body and the first movable body, and a driving yoke coupled to another of the fixed body and the first movable body. The driving yoke is disposed to oppose the driving coil in the direction orthogonal to the first direction. When current is applied to the driving coil, the first movable body is configured to move in the direction orthogonal to the first direction by electromagnetic interaction between the driving coil and the driving yoke.

The driving yoke may be a soft magnetic material.

When no current flows in the driving coil, a magnetic field due to the driving yoke may be zero.

The driving coil and the driving yoke may oppose each other in a second direction orthogonal to the first direction, and electromagnetic interaction between the driving coil and the driving yoke may be configured to move the movable body in the second direction.

The driving coil and the driving yoke may oppose each other in a second direction orthogonal to the first direction. The driving coil may include a first driving coil and a second driving coil disposed on both sides of the first movable body in the second direction, respectively. The driving yoke may include a first driving yoke and a second driving yoke opposing the first driving coil and the second driving coil in the second direction, respectively.

The driver may further include a yoke disposed on one side of the driving coil, and the driving coil may be disposed between the driving yoke and the yoke.

The driving coil and the driving yoke may oppose each other in a diagonal direction of the image sensor.

The sensor shifting module may further include an elastic member, disposed between the first movable body and the fixed body, configured to deform based on a movement of the first movable body with respect to the fixed body.

The elastic member may be a leaf spring.

The sensor shifting module may further include a second movable body disposed between the first movable body and the fixed body; a first ball member disposed between the fixed body and the second movable body; and a second ball member disposed between the second movable body and the first movable body.

The fixed body and the second movable body may include a first groove configured to accommodate, at least, a portion of the first ball member, and the second movable body and the first movable body may include a second groove configured to accommodate, at least, a portion of the second ball member.

The first groove may extend in a second direction orthogonal to the first direction, and the second groove may extend in a third direction orthogonal to each of the first direction and the second direction.

The driver may further include a first magnetic body, coupled to the second movable body, and a second magnetic body, coupled to each of the first movable body and the fixed body, opposing the first magnetic body.

The second magnetic body may include a through-portion, and the driver further may include a position sensor disposed in the through-portion.

In another general aspect, a camera module includes a lens module including a lens, and a sensor shifting module. The sensor shifting module includes a fixed body; a first movable body, movably disposed in the fixed body, comprising an image sensor opposing a first direction; and a driver, configured to move the first movable body in a direction orthogonal to the first direction with respect to the fixed body, comprising a driving coil, coupled to one of the fixed body and the first movable body, and a driving yoke coupled to another of the fixed body and the first movable body. The driving yoke is disposed to oppose the driving coil in the direction orthogonal to the first direction, and a space between the driving yoke and the driving coil is an air gap.

The driving yoke may be a soft magnetic material.

The camera module may further include an elastic member, disposed between the first movable body and the fixed body, configured to deform based on a movement of the first movable body with respect to the fixed body.

Throughout the drawings and the detailed description, the same reference numerals refer to the same or like elements. The drawings may not be to scale, and the relative size, proportions, and depiction of elements in the drawings may be exaggerated for clarity, illustration, and convenience.

DETAILED DESCRIPTION

In the example embodiments, the X-direction, the Y-direction, and the Z-direction may refer to a direction parallel to the X axis, a direction parallel to the Y axis, and a direction parallel to the Z axis, respectively, in the drawings. Also, unless otherwise indicated, the X-direction may include both the +X-axis direction and the −X-axis direction, which may also apply to the Y-direction and the Z-direction.

In the example embodiments, two directions (or axes) parallel or orthogonal to each other may also include the examples in which the two directions (or axes) are substantially parallel to or substantially side by side to each other. For example, the configuration in which the first axis and the second axis are orthogonal to each other may indicate that the first axis and the second axis may form an angle of 90 degrees or an angle approximated to 90 degrees.

“An example embodiment” does not necessarily indicate the same example embodiments. The particular features, structures, or characteristics may be combined in any suitable manner consistent with the example embodiments.

In the example embodiments, “configured to” may indicate that a component may include a structure desired to implement a function.

FIG.1is a diagram illustrating components included in a camera module1according to an example embodiment.

In an example embodiment, the camera module1may include a lens module20, including at least one lens21, a lens barrel22, accommodating at least one lens21, and an image sensor11. Light L may pass through the lens module20and may reach an imaging plane of the image sensor11. The camera module1may include an AF driver23, which may move the lens module20in an optical axis direction to adjust a focal length. The AF driver23may include, for example, a coil and a magnet opposing each other. The coil may be fixedly coupled to the lens module20, the magnet may be coupled to a fixed body such as a housing, and electromagnetic interaction between the coil and the magnet may allow the lens module20to move in the optical axis direction.

In an example embodiment, the camera module1may provide an optical image stabilization (hereinafter, “OIS”) function. The camera module1may provide an OIS function by driving the image sensor11. For example, the camera module1may include an OIS driver12configured to move the image sensor11in a direction orthogonal to the optical axis or to allow the image sensor11to rotate about an axis parallel to the optical axis or to rotate about an axis orthogonal to the optical axis.

In an example embodiment, the camera module1may include a sensor shifting module10. The sensor shifting module10may include components desired to implement the OIS function by driving the image sensor11. For example, the sensor shifting module10may include an image sensor11and an OIS driver12for driving the image sensor11. As another example, the sensor shifting module10may refer to only the OIS driver12, excluding the image sensor11.

In an example embodiment, the camera module1may further include an optical element in addition to the lens module20and the image sensor11. In an example embodiment, the camera module1may include two or more lens modules. For example, the first optical element30and/or the second optical element40may be a lens module distinct from the lens module20.

In an example embodiment, the camera module1may include an optical path changing element disposed in front of the lens module20. For example, the first optical element30may be implemented as a prism or a mirror. In another example embodiment, the optical path changing element may be disposed between the image sensor11and the lens module20. For example, the second optical element40may be implemented as a prism or a mirror.

Hereinafter, the sensor shifting module100or the OIS driver120described inFIGS.2to8may be applied to the camera module1inFIG.1.

FIG.2illustrates a sensor shifting module100according to an example embodiment. The sensor shifting module100may include an OIS driver120for driving the image sensor111. In an example embodiment, the OIS driver120may include a first movable body110, including an image sensor111and a fixed body130. The first movable body110may be movably disposed in the fixed body130. The first movable body110may be configured to move together with the image sensor111. For example, the first movable body110may include a sensor substrate112on which the image sensor111is mounted and a sensor holder113coupled to the sensor substrate112. A signal from the image sensor111may be transmitted to another electronic component (e.g., an image signal processor (ISP)) through the sensor substrate112and the connector150.

The fixed body130may include a base131and components fixedly coupled to the base131. For example, the fixed body130may include a driving coil122and a yoke123to be described later.

The first movable body110may, through the OIS driver120, move in a direction orthogonal to a direction in which the imaging plane111aof the image sensor111is directed. In an example embodiment, the OIS driver120may compensate for the shaking of the camera module1or the electronic device on which the image sensor111is mounted in a direction orthogonal to the optical axis O. The OIS driver120may move the image sensor111in a first direction and a second direction orthogonal to the optical axis O. As illustrated in FIG. The first direction and the second direction may intersect each other. For example, the OIS driver120may move the first movable body110in the X-direction and/or the Y-direction orthogonal to the Z axis, such that the shaking in the X-direction and/or the Y-direction may be corrected.

In the example embodiments, the direction in which the imaging plane111aof the image sensor111is directed may be referred to as an optical axis O direction. That is, the first movable body110may move in a direction orthogonal to the optical axis O with respect to the fixed body130. In the drawings, the optical axis O may be parallel to the Z axis; accordingly, the Z-direction may refer to the direction parallel to the optical axis O. Also, the X-direction or Y-direction may refer to a direction orthogonal to the optical axis O. For example, in the example embodiments, the configuration in which the first movable body110may in the X-direction may indicate that the first movable body110may move in a direction orthogonal to the optical axis O. For another example, the configuration in which the driving yoke121and the driving coil122oppose each other in the X-direction may indicate that the driving yoke121and the driving coil122may oppose each other in a direction orthogonal to the optical axis O. Also, the X-direction or the Y-direction may be an example of two directions orthogonal to the optical axis and intersecting each other, and in the example embodiments, the X-direction and the Y-direction may be two directions orthogonal to the optical axis O and intersecting each other.

In an example embodiment, the OIS driver120may include a second movable body140disposed between the first movable body110and the fixed body130. The second movable body140may include a ball guide141and a component (e.g., a first magnetic body124) fixedly coupled to the ball guide141.

In an example embodiment, the first ball member B1may be disposed between the fixed body130and the second movable body140, and the second ball member B2may be disposed between the second movable body140and the first movable body110.

Each of the fixed body130and the second movable body140may include a first groove G1for accommodating at least a portion of the first ball member B1. Each of the second movable body140and the first movable body110may include a second groove G2for accommodating at least a portion of the second ball member B2.

In the example embodiment, the number of each of the first ball member B1, the second ball member B2, the first groove G1, and the second groove G2may be described as one, but a plurality of each component may be provided.

The first groove G1and the second groove G2may extend in two directions orthogonal to the optical axis O, respectively, and intersecting each other. For example, when the optical axis O is parallel to the Z axis, the first groove G1may extend in the Y-direction, and the second groove G2may extend in the X-direction. The first ball member B1and the second ball member B2move along the first groove G1and the second groove G2, respectively. Accordingly, the movement direction of the second movable body140with respect to the fixed body130may be limited to the Y-direction, and the movement direction of the first movable body110with respect to the second movable body140may be limited to the Y-direction.

InFIG.2, the first groove G1and the second groove G2may be formed only in the second movable body140and the first movable body110, respectively, but an example embodiment thereof is not limited thereto. For example, the first groove G1may be formed in both the base131and the ball guide141. Also, the second groove G2may be formed in both the ball guide141and the sensor holder113.

The second movable body140or the ball guide141may not be essential components, and the first movable body110may move directly on the base131. For example, inFIG.2, the second movable body140may not be provided, a ball member may be disposed between the sensor holder113and the base131, and the sensor holder113and/or the base131may include a groove to accommodate the ball member.

FIG.3illustrates a pulling means and a position sensor according to an example embodiment.

The first movable body110may need to move only in a direction orthogonal to the optical axis O, and may not move in a direction parallel to the optical axis O. To this end, the OIS driver120may include a pulling means. The pulling means may include the second magnetic bodies125and126and the first magnetic body124disposed to oppose each other in the optical axis O direction. A magnetic attraction may act between the first magnetic body124and the second magnetic body125and126. For example, the first magnetic body124may be a permanent magnet, and the second magnetic body125and126may be a yoke. As another example, the first magnetic body124and the second magnetic body125and126may be permanent magnets.

In an example embodiment, the first magnetic body124may be coupled to the ball guide141, and a 2-1 magnetic material125and a 2-2 magnetic material126opposing the first magnetic body124in the Z-direction may be disposed in the sensor holder113and the base131, respectively.

Referring toFIGS.2and3, the first movable body110may be pulled toward the base131by magnetic force arising between the second magnetic bodies125and126and the first magnetic body124, and the first ball member B1and the second ball member B2may roll while being in close contact with the first groove G1and the second groove G2, respectively. When the second movable body140may not be provided, the magnet and the yoke may be mounted on the sensor holder113or the base131, respectively, such that the magnetic force between the components may pull the sensor holder113toward the base131(that is, −Z-direction)

Referring toFIG.3, in an example embodiment, the OIS driver120may include a position sensor127and128which may measure how much the first movable body110moves in a direction orthogonal to the optical axis O. The position sensors127and128may be configured as Hall sensors or magnetoresistance sensors.

The position sensors127and128may be disposed to oppose the first magnetic body124. For example, the position sensors127and128may be disposed on the sensor holder113and/or the base131to oppose the first magnetic body124. In an example embodiment, the position sensors127and128may be disposed in the second magnetic bodies125and126. In an example embodiment, the second magnetic bodies125and126may include through-portions125aand126a, and the position sensors127and128may be disposed in the through-portions125aand126a.

The first movable body110may move in the X-direction with respect to the second movable body140, and the first position sensor127disposed in the 2-1 magnetic body125may measure a displacement in the X-direction between110and the second movable body140. The second movable body140may move in the Y-direction with respect to the fixed body130, and the second position sensor128disposed in the 2-2 magnetic body126may measure a displacement in the Y-direction between the fixed body130and the second movable body130.

The first position sensor127coupled to the first movable body110may be electrically connected to the other electronic components through a flexible substrate. For example, a signal generated by the first position sensor127may be electrically connected to a connector150through an electrical wiring provided on the sensor substrate112.

Referring toFIG.2, in an example embodiment, the OIS driver120may include a driving coil122coupled to one of a first movable body110and a fixed body130, and a driving yoke121coupled to the other of the first movable body110and the fixed body130. For example, referring toFIG.2, in an example embodiment, the driving coil122and the driving yoke121may be coupled to the base131and the sensor holder113, respectively. The driving yoke121and the driving coil122may oppose each other in a direction orthogonal to the optical axis O. Electromagnetic interaction between the driving yoke121and the driving coil122may allow the first movable body110to move in a direction orthogonal to the optical axis O with respect to the fixed body130.

In an example embodiment, the OIS driver120may further include a yoke123disposed on one side of the coil. The yoke123may allow the magnetic field generated in the coil to be concentrated only in a direction toward the driving yoke121. Since the yoke123is disposed on one side of the driving coil121, the magnetic field generated by the driving coil121may be prevented from affecting the other electronic components or the effect of the magnetic field on the other electronic components may be reduced.

In the example embodiments, the driving coil122and the driving yoke121may be coupled to the fixed body130and the first movable body110, respectively, but an example embodiment thereof is not limited thereto. In another example embodiment, the driving coil122and the driving yoke121may be coupled to the first movable body110and the fixed body130, respectively. For example, the driving coil122and the driving yoke121may be coupled to the sensor holder113and the base131, respectively.

An air gap may be formed between the driving coil122and the driving yoke121. Alternatively, a space between the driving coil122and the driving coil121may be an air gap. That is, no other member (e.g., a magnet) may be present between the driving coil122and the driving yoke121. The driving coil122and the driving yoke121may directly oppose each other with an air gap therebetween.

FIG.2illustrates components of the OIS driver120, and the example embodiment thereof is not limited to the structure inFIG.2.

In an example embodiment, the OIS driver120may not include a permanent magnet. In an example embodiment, when no current flows in the driving coil122, the magnetic field caused by the driving yoke121may be zero or at a very small level. Accordingly, the magnetic field caused by the OIS driver120may be prevented from affecting the other electronic components (e.g., the other electronic components in the camera module1, or the other electronic components in the camera module1) or the effect of the magnetic field on the other electronic components may be reduced.

In an example embodiment, the driving yoke121may be a soft magnetic material. A soft magnetic material may have a small coercive force and may be magnetized when exposed to a magnetic field, but when the magnetic field disappears, the driving yoke121may have a relatively low level of magnetism or may lose magnetism.

When a current is applied to the driving coil122, the driving yoke121may be magnetized, such that reluctance force may arise between the driving coil122and the driving yoke121. Attractive force may arise in a direction in which the driving yoke121and the driving coil122oppose each other, and the attractive force may move the first movable body110in the corresponding direction with respect to the fixed body130. For example, referring toFIG.4A, when a current is applied to the first driving coil122, an attractive force may arise between the first driving coil122and the first driving yoke121, and may move the first movable body110in the −X-direction. When a current is applied to the second driving coil122, an attractive force may arise between the second driving coil122and the second driving yoke121, moving the first movable body110in the +X-direction.

FIGS.4A to4Care diagrams illustrating an OIS driver120according to an example embodiment, illustrating a ball member and a groove arranged differently from the examples inFIG.4B, and the descriptions of the other components may be the same as the descriptions described with reference toFIG.4A.

The OIS driver120may include a plurality of unit drivers120a,120b,120c, and120d. The unit drivers120a,120b,120c, and120dmay include a driving yoke121and a driving coil122opposing each other. The unit drivers120a,120b,120c, and120dmay further include a yoke123disposed on one side of the driving coil122. For example, the first unit driver120amay include a first driving yoke121a, a first driving coil122a, and a first yoke123a.

Since only attractive force arises between the driving coil122and the driving yoke121, at least two unit drivers may be required to move back and forth the first movable body110in one direction.

Referring toFIG.4A, the OIS driver120may include a first unit driver120adisposed in the −X-direction of the first movable body110and a second unit driver120bdisposed in the +X-direction of110to compensate for shaking in the X-direction. The first unit driver120amay include a first driving yoke121acoupled to the first movable body110, and a first driving coil122acoupled to the base131. The first unit driver120amay further include a first yoke123adisposed on one side of the first driving coil122a. The second unit driver120bmay include a second driving yoke121bcoupled to the first movable body110and a second driving coil122bcoupled to the base131. The second unit driver120bmay further include a second yoke123bdisposed on one side of the second driving coil122b.

Referring toFIG.4A, the OIS driver120may include a third unit driver120cdisposed in the +Y-direction of the first movable body110, and a fourth unit driver120ddisposed in the −Y-direction of the first movable body110to compensate for the shaking in Y-direction. The third unit driver120cmay include a third driving yoke121ccoupled to the first movable body110, and a third driving coil122ccoupled to the base131. The third unit driver120cmay further include a third yoke123cdisposed on one side of the third driving coil122c. The fourth unit driver120dmay include a fourth driving yoke121dcoupled to the first movable body110, and a fourth driving coil122dcoupled to the base131. The fourth unit driver120dmay further include a fourth yoke123ddisposed on one side of the fourth driving coil122d.

Referring toFIG.4a, the grooves G1and G2for guiding the ball member B1and B2and the ball member B1and B2may be disposed adjacently to the corner113aof the sensor holder113. The first groove G1for accommodating the first ball member B1and the first ball member B1may be disposed adjacently to the corner113aof the sensor holder113, and the second groove G2for accommodating the ball member B2and the second ball member B2may also be disposed adjacently to the corner113aof the sensor holder113. Referring toFIG.4A, the first groove G1and the second groove G2may overlap each other in the optical axis O direction.

Referring toFIG.4b, the ball member B1and B2and the groove G1and G2may be disposed between the two neighboring corners113a. The ball members B1and B2and the grooves G1and G2may be disposed adjacently to the center of the side surface113bconnecting the two neighboring corners113ato each other. For example, the second ball member B2and the second groove G2partially accommodating the second ball member B2may be disposed adjacently to the center of the side surface113bof the sensor holder113. The first ball member B1and the first groove G1may be disposed adjacently to both ends of the side surface113bof the sensor holder113as inFIG.4A. InFIG.4B, the first groove G1and the second groove G2may not overlap in the optical axis O direction. Accordingly, rigidity of the ball guide141, including both the first groove G1and the second groove G2may improve.

Referring toFIG.4c, three first ball members B1-1, B1-2, and B1-3may be disposed between the second movable body140and the fixed body130. Two first ball members B1-1and B1-2among the three first ball members B1-1, B1-2, and B1-3may be disposed adjacently to both ends of one side surface113b-1(e.g., the side surface oriented in the −X-direction) of the sensor holder113, and the other B1-3may be disposed adjacently to the center of the other side surface113b-2(e.g., the side surface oriented in the +X-direction). Accordingly, the second movable body140may be supported at three points by the first ball members B1-1, B1-2, and B1-3.

Referring toFIG.4c, three second ball members B2-1, B2-2, and B2-3may be disposed between the first movable body110and the second movable body140. Two second ball members B2-1and B2-2among the three second ball members B2-1, B2-2, and B2-3may be disposed adjacently to both ends of one side surface113b-2(e.g., the side surface oriented in the −X-direction) of the sensor holder113, and the other B2-3may be adjacent to the center of the other side surface113b-1(e.g., the side surface oriented in the +X-direction). Accordingly, the first movable body110may be supported at three points by the second ball members B2-1, B2-2, and B2-3.

FIGS.5A to5Dare diagrams illustrating the movement of a first movable body due to an OIS driver inFIG.4A.

Referring toFIG.5A, a current may be applied to the first driving coil122asuch that the first driving coil122amay pull the first driving yoke121ain the direction of an arrow, and accordingly, the first movable body110may move in the −X-direction. Referring toFIG.5B, a current may be applied to the second driving coil122bsuch that the second driving coil122bmay pull the second driving yoke121bin the direction of an arrow, and accordingly, the first movable body110may move in the +X-direction. Referring toFIG.5C, a current may be applied to the third driving coil122csuch that the third driving coil122cmay pull the third driving yoke121cin the direction of the arrow, and accordingly, the first movable body may move in the +Y-direction. Referring toFIG.5D, a current may be applied to the fourth driving coil122dsuch that the fourth driving coil122dmay pull the fourth driving yoke121din the direction of the arrow, and accordingly, the first movable body110may move in the −Y-direction.

FIG.6is a diagram illustrating an example in which unit drivers120a,120b,120c, and120dare disposed in a diagonal direction of a driving direction of an image sensor according to an example embodiment.

In an example embodiment, the first movable body110may move in two directions orthogonal to the optical axis and orthogonal to each other. For example, the first movable body110may move in the X-direction and the Y-direction. The OIS driver120may allow the first movable body110to move in a first direction OIS-X parallel to the horizontal side111cof the image sensor111and in a second direction OIS-Y parallel to the vertical side111dof the image sensor111. For example, referring toFIG.6, the image sensor111may include a horizontal side111bextending in the X-direction and a vertical side111cextending in the Y-direction, and a first groove G1and a second groove G1may extend in the Y-direction and the X-direction, respectively.

Referring toFIG.6, the unit drivers120a,120b,120c, and120dmay be disposed orthogonal to the optical axis O the two movement directions OIS-X and OIS-Y orthogonal to the optical axis O and orthogonal to each other. For example, the first unit driver120aand the second unit driver120bmay be disposed on both sides of the image sensor111in the first diagonal direction D1. The third unit driver120cand the fourth unit driver120dmay be disposed on both sides of the image sensor111in the second diagonal direction D2.

In an example embodiment, when the OIS driver120is configured to move the first movable body110in a first direction OIS-X and the second direction OIS-Y, the driving coil122and the driving yoke121may oppose each other in a direction between the first direction OIS-X and the second direction OIS-Y. For example, when the OIS driver120is configured to move the first movable body110in the X-direction and the Y-direction, the driving coil122and the driving yoke121may oppose each other in the angular directions D1and D2, forming 45 degrees to the X-axis or the Y-axis.

Even when the unit drivers120a,120b,120c, and120dare disposed as illustrated inFIG.6, the grooves G1and G2for guiding the ball members B1and B2and the ball members B1and B2may be disposed as inFIG.4B or4C.

FIGS.7A to7Dare diagrams illustrating the movement of a first movable body due to an OIS driver inFIG.6.

Referring toFIG.7A, a current may be applied to the first driving coil122aand the fourth driving coil122dsuch that the first driving coil122aand the fourth driving coil122dmay pull the first driving yoke121aand the second driving yoke121bin the direction of the arrow, and accordingly, the first movable body110may move in the −X-direction. Referring toFIG.7B, a current may be applied to the second driving coil122band the third driving coil122csuch that the second driving coil122band the third driving coil122cmay pull the second driving yoke121band the third driving yoke121cin the direction of the arrow, and accordingly, the first movable body110may move in the +X-direction. Referring toFIG.7C, a current may be applied to the first driving coil122aand the third driving coil122csuch that the first driving coil122aand the third driving coil122cmay pull the first driving yoke121aand the third driving yoke121cin the direction of the arrow, and accordingly, the first movable body110may move in the +Y-direction. Referring toFIG.7D, a current may be applied to the second driving coil122band the fourth driving coil122dsuch that the second driving coil122band the fourth driving coil122dmay pull the second driving yoke121band the fourth driving yoke121din the direction of the arrow, and accordingly, the first movable body110may move in the −Y-direction.

FIG.8is a diagram illustrating an elastic member providing restoring force to a first moveable body according to an example embodiment.

Referring toFIG.8, the OIS driver120may include an elastic member160providing a restoring force to the first movable body110. The elastic member160may be disposed between the first movable body110and the fixed body130, and when the first movable body110moves in one direction, the elastic member160may be deformed and may prove a restoring force to the first movable body110.

In an example embodiment, the elastic member160may be a leaf spring. In this case, both ends of the elastic member160may be fixed to the fixed body130, and may have a curved shape, curved toward the first movable body110.

In an example embodiment, four elastic members161,162,163, and164may be disposed to oppose each of the four side surfaces of the first movable body110. For example, when the first movable body110moves in the −X-direction, the first elastic member161is compressed and pushes the first movable body110in the +X-direction. When the first movable body110moves in the +X-direction, the second elastic member162may be compressed and may push the first movable body110in the −X-direction. When the first movable body110moves in the +Y-direction, the third elastic member163may be compressed and may push the first movable body110in the −X-direction. When the first movable body110moves in the −Y-direction, the fourth elastic member164may be compressed and may push the first movable body110in the +Y-direction.

According to the aforementioned example embodiments, the camera may provide effective optical image stabilization with low power. Alternatively, according to an example embodiment, the effect of the magnetic field of the actuator driving the image sensor affecting the electronic component disposed outside the camera may be eliminated or reduced.