Camera module

A camera module device is provided. The device includes a movable body configured to accommodate a lens barrel and configured to be moved in a direction of an optical axis and in a direction perpendicular to the optical axis, a housing configured to accommodate the movable body, a first driving unit, disposed on a first surface of the movable body, and configured to generate a first driving force to move the movable body in the direction of the optical axis, a second driving unit, disposed on a second surface and a third surface of the movable body, and configured to generate driving force to move the movable body in a direction perpendicular to the optical axis, and a first sensing unit, disposed on a fourth surface of the movable body, and configured to detect a position of the lens barrel moved in a direction perpendicular to the optical axis.

CROSS-REFERENCE TO RELATED APPLICATION(S)

This application claims the benefit under 35 USC 119(a) of Korean Patent Application No. 10-2020-0049021 filed on Apr. 23, 2020 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.

2. Description of Related Art

Camera modules may include lens modules. The lens module may be moved in an optical axis direction and in a direction perpendicular to the optical axis to enable focus adjustment and camera shake correction of the camera module. The camera module may include a plurality of driving units that enable movement of the lens module. The driving units include a coil and a magnet. The camera module may include a detection sensor that detects the position of the lens module. The detection sensor is configured to detect the position of the lens module through a change in the magnetic field according to the movement of the lens module. However, as described above, a plurality of driving units with magnets are disposed around the lens module, so that the detection reliability of the lens module by the detection sensor may be poor.

SUMMARY

In a general aspect, a camera module device includes a movable body configured to accommodate a lens barrel and configured to be moved in a direction of an optical axis and in a direction perpendicular to the optical axis; a housing configured to accommodate the movable body; a first driving unit, disposed on a first surface of the movable body, and configured to generate a first driving force to move the movable body in the direction of the optical axis; a second driving unit, disposed on a second surface and a third surface of the movable body, and configured to generate a second driving force to move the movable body in the direction perpendicular to the optical axis; and a first sensing unit, disposed on a fourth surface of the movable body, and configured to detect a position of the lens barrel when the lens barrel is moved in the direction perpendicular to the optical axis.

The movable body may include a first frame, configured to move in the direction of the optical axis; a second frame, disposed on the first frame, and configured to move in a first direction, perpendicular to the optical axis; and a third frame, disposed on the second frame, and configured to move in a second direction, perpendicular to the optical axis and the first direction.

The device may further include a cover member combined with the first frame when the second frame and the third frame are mounted to prevent the second frame and the third frame from deviating from the first frame.

The device may include ball bearings disposed between the first frame and the second frame, and between the second frame and the third frame.

A first driving magnet of the first driving unit may be disposed on a first surface of the first frame, and a second driving magnet of the second driving unit may be disposed on different second and third surfaces of the third frame, not facing the first surface.

A first sensing magnet of the first sensing unit may be disposed on a fourth surface of the third frame, not facing the first surface.

The first sensing unit may include a first sensing magnet disposed on the movable body; and a first detection sensor disposed on the housing.

The first detection sensor may be disposed at an interval in a direction perpendicular to the optical axis.

The first detection sensor may be disposed at an interval in the direction of the optical axis.

The first sensing magnet may be configured to have a first polarity and a second polarity formed in a direction perpendicular to the optical axis.

The first sensing magnet may be configured to have a neutral region disposed between the first polarity and the second polarity.

The first sensing magnet may be provided at an interval in a direction perpendicular to the optical axis.

In a general aspect, an electronic device includes a housing; and a camera module disposed in the housing, wherein the camera module comprises a moveable body, configured to accommodate a lens barrel, the movable body comprising a first frame, disposed in the housing, and configured to move the lens barrel in an optical axis direction; a second frame, disposed on the first frame, and configured to move the lens barrel in a first direction, perpendicular to the optical axis direction; a third frame, disposed on the second frame, and configured to move the lens barrel in a second direction perpendicular to the optical axis direction, and a first sensing unit, disposed on a surface of the movable body, and configured to detect a moving position of the movable body in the direction perpendicular to the optical axis direction.

The device may include a first driving unit, disposed on a first surface of the moveable body, and configured to move the first frame in the optical axis direction, and a second driving unit, disposed on a second surface and a third surface of the moveable body, and configured to move the second frame and the third frame in the direction perpendicular to the optical axis direction.

The first sensing unit is disposed on a fourth surface of the movable body, and is configured to detect a position of the lens barrel when the lens barrel is moved in the direction perpendicular to the optical axis.

The device may further include a second sensing unit configured to detect a moving position of the movable body in the optical axis direction.

DETAILED DESCRIPTION

Herein, it is noted that use of the term “may” with respect to an embodiment or example, e.g., as to what an embodiment or example may include or implement, means that at least one embodiment or example exists in which such a feature is included or implemented while all examples and examples are not limited thereto.

The drawings may not be to scale, and the relative sizes, proportions, and depiction of elements in the drawings may be exaggerated for clarity, illustration, and convenience.

A configuration of a camera module, in accordance with one or more embodiments, will be described with reference toFIGS. 1 and 2.

A camera module10, in accordance with one or more embodiments, may be mounted in a portable electronic product. In an example, the camera module10may be mounted on, as non-limiting examples, a mobile phone, laptop, or the like. However, the use range of the camera module10, in accordance with one or more embodiments, is not limited to the aforementioned electronic products. In an example, the camera module10may be mounted in an automated teller machine (ATM), a television for interactive broadcasting, and the like.

As illustrated inFIG. 2, the camera module10may include a housing100, a lens barrel160, a movable body200(210,220,230), a first driving unit300(310,320), a second driving unit400(410,412,420,422), and a first sensing unit500(510,520,530). However, the configuration of the camera module10is not limited to the aforementioned members. For example, the camera module10may further include a ball bearing600(610,620and630), a cover member700, a substrate800, and a shield can900.

The housing100may be formed in the form of a face body with open upper and lower surfaces. In an example, the housing100may be configured in a substantially hexahedral shape. Four sides of the housing100may be partially cutaway. The driving force of the first driving unit300and the second driving unit400may be transmitted to the movable body200through the cut side. A pair of first guide grooves102may be formed in an inner side of the housing100. The first guide groove102may be formed to be elongated in the height direction of the housing100. One or more first ball bearings610may be disposed in the first guide groove102.

The movable body200is disposed inside the housing100and may be configured to move in the direction of an optical axis and in a direction perpendicular to the optical axis within the housing100. The movable body200may be comprised of a plurality of members. For example, the movable body200may be comprised of a first frame210, a second frame220, and a third frame230.

The first frame210may have a shape which is open in the vertical direction and which has one closed side and three open sides. A pair of second guide grooves212may be formed in one closed side. One or more first ball bearings610may be disposed in the second guide groove212. The first frame210is disposed inside the housing100. The first frame210may be configured to move in the optical axis direction with respect to the housing100. For example, the first frame210may move in the optical axis direction by the first ball bearing610disposed in the guide grooves102and212. The driving force necessary to drive the first frame210may be provided by the first driving unit300.

The second frame220may have a substantially thin plate shape in which upper and lower portions in the vertical direction are open. The second frame220may be configured to be disposed on the first frame210, and to move in a first direction, perpendicular to the optical axis. In an example, the second frame220may move in the first direction, perpendicular to the optical axis, by second ball bearing620disposed between the first frame210and the second frame220. The driving force necessary to drive the second frame220may be provided by the second driving unit400.

The third frame230may have a shape, of which upper and lower portions in the vertical direction are open and which has a predetermined height. The third frame230may be configured to be disposed on the second frame220and to move in a second direction, perpendicular to the optical axis. In an example, the third frame230may move in the second direction, perpendicular to the optical axis, by third ball bearing630disposed between the second frame220and the third frame230. The driving force required for driving the third frame230may be provided by the second driving unit400.

The lens barrel160may be combined with the third frame230. The lens barrel160may be moved by the movable body200in an optical axis direction and a direction, perpendicular to the optical axis. For example, the lens barrel160may move in the optical axis direction based on a movement by the first frame210. In another example, the lens barrel160may move in a direction, perpendicular to the optical axis, based on movements by the second frame220and the third frame230. The movement of the lens barrel160in the direction of the optical axis may enable focus adjustment of the camera module10, and the movement of the lens barrel160in a direction, perpendicular to the optical axis may enable camera shake correction function of the camera module10.

The first driving unit300may be configured to move the movable body200in the optical axis direction. For example, the first driving unit300may provide driving force required to move the first frame210in the optical axis direction. The first driving unit300may include a first driving magnet310and a first driving coil320. The first driving unit300may be configured to generate a driving force to move the movable body200in the optical axis direction, on a first surface of the movable body200. In an example, the first driving magnet310may be disposed on a first surface of the first frame210, and the first driving coil320may be disposed on a first surface of the housing100.

The camera module10may include a second sensing unit to detect the moving position of the movable body200in the optical axis direction. In an example, the camera module10may include a hall sensor330. In a non-limiting example, the hall sensor330may be disposed in the center of the winding of the first driving coil320.

The second driving unit400may be configured to move the movable body200in a direction, perpendicular to the optical axis. For example, the second driving unit400may provide a driving force that is necessary for the movement of the second frame220and the third frame230. The second driving unit400may include second driving coils410and412and second driving magnets420and422. The second driving unit400may be configured to generate a driving force to move the movable body200in a direction, perpendicular to the optical axis, on the second and third surfaces of the movable body200. For example, the second driving magnets420and422may be disposed on the second and third surfaces of the third frame230, respectively, and the second driving coils410and412may be disposed on the second and third surfaces of the housing100, respectively. In an example, the second surface of the third frame230may be a surface intersecting the first surface of the first frame210, and the third surface of the third frame230may be a surface intersecting the second surface of the third frame230while not intersecting the first surface of the first frame210.

The first sensing unit500may be configured to detect a moving position of the movable body200in a direction, perpendicular to the optical axis. In an example, the first sensing unit500may be configured to detect the moving position of the third frame230. The first sensing unit500may include a first sensing magnet510and first detection sensors520and530. The first sensing unit500may be configured to sense the displacement of the movable body200moving in a direction, perpendicular to the optical axis, on the fourth surface of the movable body200. For example, the first sensing magnet510may be disposed in the center of the fourth surface of the third frame230, and the first detection sensors520and530may be disposed on the fourth surface of the housing100. The first detection sensors520and530may be disposed at an interval therebetween in a direction, perpendicular to the optical axis. For example, the first detection sensor520may be disposed to face one end of the first sensing magnet510, and the first detection sensor530may be disposed to face the other end of the first sensing magnet510.

The camera module10may include a unit that binds the first frame210to the third frame230. For example, the camera module10may include a cover member700for binding the second frame220and the third frame230to the first frame210. The cover member700is coupled to the first frame210in a state in which the first frame210to the third frame230are stacked, to prevent the separation of the second frame220and the third frame230from the first frame210.

The camera module10may include a unit that supplies current to the driving units300and400. In an example, the camera module10may include a first substrate800. The first substrate800may be configured to supply current necessary to drive the first driving unit300and the second driving unit400. in an example, the first substrate800may supply current to the first driving coil320and the second driving coil410and412. The first substrate800may be configured to provide a space in which the first driving coil320and the second driving coils410and412may be disposed. In an example, the first substrate800may be disposed to surround the first surface, the second surface and the third surface of the housing100, to provide a space in which the first driving coil320and the second driving coils410and412may be disposed in the housing100.

The camera module10may include a unit that electrically connects the first detection sensors520and530. For example, the camera module10may include a second substrate810. The second substrate810may be configured to transmit a detection signal received from the first detection sensors520and530to a control unit. For example, the second substrate810may be electrically connected to a main circuit board of the camera module10together with the first substrate800. The second substrate810may be integrally formed with the first substrate800. For example, one end of the first substrate800and one end of the second substrate810may be configured to be connected to each other. Additionally, the first substrate800and the second substrate810may be manufactured in the form of a flexible printed circuit board to facilitate thinning of the camera module10.

The camera module10may include a unit for shielding electromagnetic waves. For example, the camera module10may include a shield can900. The shield can900may be formed in a shape surrounding the housing100, the movable body200, and the cover member700. Accordingly, intrusion or emission of harmful electromagnetic waves generated inside or outside the camera module10may be blocked by the shield can900.

The moving structure of the movable body200will be described with reference toFIGS. 3 to 5.

The first frame210, the second frame220and the third frame230constituting the movable body200may be stacked and coupled in the optical axis direction as illustrated inFIG. 3. The first frame210may be configured to accommodate the second frame220and the third frame230. In an example, the second frame220and the third frame230may be configured to move in a direction, perpendicular to the optical axis, while being accommodated inside the first frame210.

The ball bearings610and620may be disposed between the first frame210and the third frame230. In an example, the second ball bearing620may be disposed between the first frame210and the second frame220, and the third ball bearing630may be disposed between the second frame220and the third frame230.

A space for the ball bearing to be disposed may be formed in the first frame210to the third frame230. For example, a first groove214is formed in the upper portion of the first frame210, second grooves224and226are formed in the upper and lower portions of the second frame220, and a third groove234may be formed in the lower portion of the third frame230.

The lengths of the grooves224and234formed below the second frame220and the third frame230may be formed differently depending on the moving directions of the second frame220and the third frame230. In an example, a length WY2of the groove224in the first direction may be greater than a length WX1in the second direction, and a length WX2of the groove234in the second direction may be greater than a length WY1of the groove234in the first direction. Additionally, a length WY2of the groove224in the first direction may be greater than the length WY1of the grooves214,226and234in the first direction, and the length WX2of the groove234in the second direction may be greater than the length WX1of the grooves214,224and226in the second direction.

In the example of the second frame220configured as described above, since the length of the groove224in the first direction may be greater than the length of the groove214in the first direction, relative movement thereof relative to the first frame210may be enabled. Additionally, in the example of the third frame230, since the length of the groove234in the second direction may be greater than the length of the groove226of the second frame220in the second direction, relative movement of the third frame230relative to the second frame220may be enabled.

The arrangement form of the first sensing unit will be described with reference toFIG. 6.

The first sensing unit500may be disposed on a portion that does not overlap with the first driving unit300and the second driving unit400as illustrated inFIG. 6. For example, the first driving unit300may be disposed on the first surfaces of the housing100and the first frame210, the second driving unit400may be disposed on the second surface and the third surface of the housing100and the third frame230, and the first sensing unit500may be disposed on the fourth surface of the housing100and the third frame230.

The first sensing unit500may include a first sensing magnet510and first detection sensors520and530. The first sensing magnet510may be disposed on one surface of the third frame230to significantly reduce the influence of the driving magnets310,420and422, as illustrated inFIG. 6. The first detection sensors520and530may be disposed on one surface of the housing100to significantly reduce the influence of the driving magnets310,420and422while sensing the magnetic field of the first sensing magnet510.

The first sensing unit500configured as described above may detect a position of the third frame230through the magnetic field of the first sensing magnet510, in a state in which the first sensing unit500is hardly affected by the magnetic field generated from the driving units300and400. Therefore, according to this example, not only image stabilization through the first sensing unit500may be quickly performed, but also the reliability of the image stabilization may be improved.

Next, a method of detecting the position of the third frame230through the first sensing unit500will be described with reference toFIGS. 7A to 9B.

The first sensing unit500may detect the position of the third frame230moving in the direction, perpendicular to the optical axis, through the first sensing magnet510and the first detection sensors520and530. As an example, the first sensing unit500may calculate a movement amount y and a movement amount x of the third frame230in the first direction (the Y-axis direction based onFIGS. 7A and 7B) and the second direction (the X-axis direction based onFIGS. 7A and 7B), through a change h1 in magnetic field obtained from the first detection sensor520and a change h2 in magnetic field obtained from the first detection sensor530. The calculation formula for calculating the movement amount y and the movement amount x is as follows.
y=(h2−h1)/(h1+h2)
x=h1+h2

The first sensing unit500may include a plurality of first detection sensors520and530as illustrated inFIGS. 8A and 8B. In an example, the first detection sensors520,522,530and532may be disposed at an interval therebetween along the optical axis and in the optical axis direction. In this example, the movement amount of the third frame230may be calculated through the following calculation formula. For reference, h3 is a magnetic field change amount acquired from the first detection sensor522, and h4 is a magnetic field change amount acquired from the first detection sensor532.
y=h2−h1
x=h3+h4

As illustrated inFIGS. 9A and 9B, the first sensing unit500may include a plurality of first sensing magnets510and512. In an example, the first sensing magnets510and512may be disposed at an interval G1therebetween in a direction, perpendicular to the optical axis. However, the first sensing magnets510and512are not configured to be separated. For example, the first sensing magnets510and512may be integrally formed (in this form, G1may be a neutral region). In this form, the movement amount of the third frame230may be calculated through the following calculation formula.
y=h1+h2
x=h2−h1

A camera module, in accordance with one or more embodiments, will be described with reference toFIGS. 10 and 11.

A camera module10, in accordance with one or more embodiments, may be mounted in a portable electronic product. As non-limiting examples, the camera module10may be mounted on a mobile phone, laptop, or the like. However, the usage range of the camera module10according to this example is not limited to the aforementioned electronic products. In an example, the camera module10may be mounted in an automated teller machine (ATM), a television for interactive broadcasting, and the like.

Referring toFIG. 11, the camera module10includes a housing100, a lens barrel160, a movable body200(210,220,230), a first driving unit300(310,320), a second driving unit400(410,412,420,422), and a first sensing unit500(510,520,530). However, the configuration of the camera module10is not limited to the aforementioned members. For example, the camera module10may further include one or more ball bearings600(610,620and630), a cover member700, a substrate800, and a shield can900.

The housing100may be formed in the form of a face body with open upper and lower portions. For example, the housing100may be configured in a substantially hexahedral shape. Four sides of the housing100may be partially cutaway. The driving force of the first driving unit300and the second driving unit400may be transmitted to the movable body200through the cut side. A pair of first guide grooves102may be formed in an inner side of the housing100. The first guide groove102may be formed to be elongated in the height direction of the housing100. A first ball bearing610may be disposed in the first guide groove102.

The movable body200is disposed inside the housing100and may be configured to move in an optical axis direction and a direction, perpendicular to the optical axis within the housing100. The movable body200may be comprised of a plurality of members. For example, the movable body200may be comprised of a first frame210, a second frame220, and a third frame230.

The first frame210may have a shape, of which upper and lower portions in the vertical direction are open, and which has one closed side and three open sides. A pair of second guide grooves212may be formed on one closed side. At least one first ball bearing610may be disposed in the second guide groove212. The first frame210is disposed inside the housing100. The first frame210may be configured to move in the optical axis direction with respect to the housing100. For example, the first frame210may move in the optical axis direction by the first ball bearing610disposed in the guide grooves102and212. The driving force necessary to drive the first frame210may be provided by the first driving unit300.

The second frame220may have a substantially thin plate shape of which upper and lower portions in the vertical direction are open. The second frame220may be disposed on the first frame210and may be configured to move in a first direction, perpendicular to the optical axis. In an example, the second frame220may move in the first direction, perpendicular to the optical axis, based on the second ball bearing620disposed between the first frame210and the second frame220. The driving force necessary to drive the second frame220may be provided by the second driving unit400.

The third frame230may have a shape, of which upper and lower portions in the vertical direction are open and which has a predetermined height. The third frame230is disposed on the second frame220and may be configured to move in a second direction, perpendicular to the optical axis. In an example, the third frame230may move in the second direction, perpendicular to the optical axis, based on a third ball bearing630disposed between the second frame220and the third frame230. The driving force necessary to drive the third frame230may be provided by the second driving unit400.

The lens barrel160may be combined with the third frame230. The lens barrel160may be moved by the movable body200in the optical axis direction and a direction, perpendicular to the optical axis. In an example, the lens barrel160may move in the optical axis direction based on a movement of the first frame210. In another example, the lens barrel160may move in a direction, perpendicular to the optical axis, by the second frame220and the third frame230. The movement of the lens barrel160in the direction of the optical axis may enable focus adjustment of the camera module10, and the movement of the lens barrel160in a direction, perpendicular to the optical axis, may enable a camera shake correction function of the camera module10.

The first driving unit300may be configured to move the movable body200in the optical axis direction. In an example, the first driving unit300may provide a driving force necessary to move the first frame210in the optical axis direction. The first driving unit300may include a first driving magnet310and a first driving coil320. The first driving magnet310may be disposed on the first surface of the first frame210, and the first driving coil320may be disposed on the housing100.

The camera module10may include a second sensing unit to detect the moving position of the movable body200in the optical axis direction. In an example, the camera module10may include a hall sensor330. In a non-limiting example, the hall sensor330may be disposed in the center of winding of the first driving coil320.

The second driving unit400may be configured to move the movable body200in a direction, perpendicular to the optical axis. In an example, the second driving unit400may provide a driving force necessary for the movement of the second frame220and the third frame230. The second driving unit400may include second driving coils410and412and second driving magnets420and422. The second driving magnets420and422may be disposed on the second and third surfaces of the third frame230, respectively, and the second driving coils410and412may be disposed on the housing100. In an example, the second surface of the third frame230is a surface intersecting the first surface of the first frame210, and the third surface of the third frame230is a surface intersecting the second surface of the third frame230while not intersecting the first surface of the first frame210.

The first sensing unit500may be configured to detect a moving position of the movable body200in a direction, perpendicular to the optical axis. In an example, the first sensing unit500may be configured to detect the moving positions of the second frame220and the third frame230. The first sensing unit500may include a first sensing magnet510, a first detection sensor520and a second detection sensor540. The first sensing magnet510may be disposed in a position having a relatively longest distance from the first driving magnet310and the second driving magnets420and422. In an example, the first sensing magnet510may be disposed in the center of the fourth surface of the third frame230. The first sensing magnet510may form a first polarity and a second polarity in a direction, perpendicular to the optical axis. In an example, the N-pole and the S-pole of the first sensing magnet510may be formed in the same direction as the arrangement direction of the second detection sensor540. A neutral region may be formed between the first polarity (N pole) and the second polarity (S pole) of the first sensing magnet510.

In a non-limiting example, the first detection sensor520may be disposed on the housing100. In an example, the first detection sensor520may be disposed on one surface of the housing100facing the first sensing magnet510. The first detection sensor520may be disposed in a position having a longest distance from the first driving magnet310and the second driving magnets420and422. In an example, the first detection sensor520may be disposed in the center of the fourth surface of the housing100. The second detection sensor540may be disposed at an interval therebetween in a direction, perpendicular to the optical axis, with the first detection sensor520therebetween. In an example, the second detection sensor540may be disposed to respectively face both ends of the first sensing magnet510.

The camera module10may include a unit that binds the first frame210to the third frame230. In an example, the camera module10may include a cover member700that binds the second frame220and the third frame230to the first frame210. The cover member700is coupled to the first frame210in a state in which the first frame210to the third frame230are stacked, thereby preventing the separation of the second frame220and the three frame230from the first frame210.

The camera module10may include a unit for supplying current to the driving units300and400. For example, the camera module10may include a first substrate800. The first substrate800may be configured to supply current required for driving the first driving unit300and the second driving unit400. In an example, the first substrate800may supply current to the first driving coil320and the second driving coils410and412. The first substrate800may be configured to provide a space in which the first driving coil320and the second driving coils410and412may be disposed. In an example, the first substrate800may be disposed to surround the first surface, the second surface, and the third surface of the housing100, to provide a space in which the first driving coil320and the second driving coils410and412may be disposed in the housing100.

The camera module10may include a unit that is electrically connected to the detection sensors520and540. In an example, the camera module10may include a second substrate810. The second substrate810may be configured to transmit a detection signal received from the detection sensors520and540to a control unit. In an example, the second substrate810may be electrically connected to a main circuit board of the camera module10together with the first substrate800. The second substrate810may be integrally formed with the first substrate800. In an example, one end of the first substrate800and one end of the second substrate810may be configured to be connected to each other. Additionally, the first substrate800and the second substrate810may be manufactured in the form of a flexible printed circuit board to facilitate thinning of the camera module10.

The camera module10may include a unit that shields electromagnetic waves. In an example, the camera module10may include a shield can900. The shield can900may be formed in a shape surrounding the housing100, the movable body200, and the cover member700. Accordingly, intrusion or emission of harmful electromagnetic waves generated inside or outside the camera module10may be blocked by the shield can900.

The moving structure of the movable body200will be described with reference toFIGS. 12 to 14.

The first frame210, the second frame220and the third frame230constituting the movable body200may be stacked and coupled in the optical axis direction as illustrated inFIG. 3. The first frame210may be configured to accommodate the second frame220and the third frame230. For example, the second frame220and the third frame230may be configured to move in a direction, perpendicular to the optical axis, while being accommodated inside the first frame210.

Ball bearings610and620may be disposed between the first to third frames210to230. For example, a second ball bearing620may be disposed between the first frame210and the second frame220, and a third ball bearing630may be disposed between the second frame220and the third frame230.

A space for the ball bearing to be disposed in may be formed in the first frame210to the third frame230. In an example, the first groove214may be formed in an upper portion of the first frame210, the second grooves224and226are formed in upper and lower portions of the second frame220, and the third groove234may be formed in a lower portion of the third frame230.

The lengths of the grooves224and234formed in the lower portions of the second frame220and the third frame230may be formed differently depending on the moving directions of the second frame220and the third frame230. In example, a length WY2of the groove224in the first direction may be greater than a length WX1in the second direction, and a length WX2of the groove234in the second direction may be greater than a length WY1of the groove234in the first direction. Additionally, the length WY2of the groove224in the first direction may be greater than the length WY1of the grooves214,226and234in the first direction, and the length WX2of the groove234in the second direction may be greater than the length WX1of the grooves214,224and226in the second direction.

In the example of the second frame220configured as described above, since the length of the groove224in the first direction may be greater than the length of the groove214of the first frame210in the first direction, relative movement thereof with respect to the first frame210may be ensured. Additionally, in the example of the third frame230, since the length of the grooves234in the second direction is greater than the length of the groove226of the second frame220in the second direction, relative movement of the third frame230relative to the second frame220may be enabled.

The disposition of the first sensing unit will be described with reference toFIG. 15.

Referring toFIG. 15, the first sensing unit500may be disposed in a portion of the module that does not overlap with the first driving unit300and the second driving unit400as illustrated inFIG. 6. In an example, the first driving unit300may be disposed on the first surfaces of the housing100and the first frame210, the second driving unit400may be disposed on the second surface and the third surface of the housing100and the third frame230, and the first sensing unit500may be disposed on the fourth surface of the housing100and the third frame230.

The first sensing unit500may include a first sensing magnet510, a first detection sensor520and a second detection sensor540. The first sensing magnet510may be disposed on one surface of the third frame230to significantly reduce the influence of the driving magnets310,420and422, as illustrated inFIG. 6. The first detection sensor520and the second detection sensor540may be disposed on one surface of the housing100, to significantly reduce influence of the driving magnets310,420and422while detecting the magnetic field of the first sensing magnet510.

The first sensing unit500configured as described above may detect a position of the third frame230through the magnetic field of the first sensing magnet510, in a state in which the first sensing unit500is hardly affected by the magnetic fields generated from the driving unit300and400. Therefore, according to this example, not only image stabilization may be quickly performed through the first sensing unit500, but also reliability of hand shake correction may be improved.

Next, a method of detecting the position of the third frame230based on the first sensing unit500will be described with reference toFIGS. 16 and 17.

The first sensing unit500may detect the position of the third frame230moving in the direction, perpendicular to the optical axis, through the first sensing magnet510, the first detection sensor520and the second detection sensor540. In an example, the first sensing unit500may calculate a movement amount y and a movement amount x of the third frame230in the first direction (the Y-axis direction based onFIGS. 16A and 16B) and the second direction (the X-axis direction based onFIGS. 16A and 16B), through a deviation h5 and a sum h6 of a value h1 obtained from the first detection sensor520and a value obtained from two second detection sensors540. The calculation formula for calculating the movement amount y and the movement amount x is as follows.
y=h5/h1
x=h1 orh6

The first sensing unit500may include a plurality of first sensing magnets510and512as illustrated inFIGS. 17A and 17B. For example, the first sensing magnets510and512may be disposed at an interval therebetween in a direction, perpendicular to the optical axis. In this form, the movement amount of the third frame230may be calculated through the following calculation formula.
y=h1 orh6
x=h5/h1

As set forth above, according to examples, the position correction of the lens module depending on a position change of the lens module may be performed quickly and accurately. Therefore, according to examples, the phenomenon of resolution deterioration due to the position change of the lens module may be reduced.