Actuator and camera device including same

Abstract

The embodiment includes a lens barrel, a magnet arranged in the lens barrel, and a coil that moves the lens barrel in a first direction by interacting with the magnet, wherein the coil includes a first coil unit, a second coil unit, and a third coil unit arranged in the first direction, the magnet overlaps with the first to third coil units in a second direction perpendicular to the first direction, and the length of the magnet in the first direction is smaller than the sum of the lengths of the first to third coil units in the first direction.

Description

[Technical Field]

[0001] The embodiments relate to an actuator and a camera device including the same. [Background technology]

[0002] A camera device is a device that captures a subject as a photograph or video, and is attached to a portable device, drone, vehicle, etc. To improve the quality of the image, the camera device may have an image stabilization (IS) function, such as an optical image stabilizer (OIS), which corrects or prevents image shake caused by the user's movement, an autofocusing (AF) function, and / or a zooming function. Summary of the Invention [Problem to be solved by the invention]

[0003] The embodiments provide an actuator and a camera device including the same that can ensure a uniform and stable driving force for movement of the moving part in the optical axis direction and increase the stroke range of the moving part. [Means for solving the problem]

[0004] An actuator according to an embodiment includes a lens barrel, a magnet arranged in the lens barrel, and a coil that moves the lens barrel in a first direction by interacting with the magnet, wherein the coil includes a first coil unit, a second coil unit, and a third coil unit arranged in the first direction, the magnet overlaps with the first to third coil units in a second direction perpendicular to the first direction, and the length of the magnet in the first direction is smaller than the sum of the lengths of the first to third coil units in the first direction.

[0005] The length of the magnet in the first direction may be greater than the sum of the lengths in the first direction of two of the first to third coil units.

[0006] Signals having different phases may be supplied to the first to third coil units, respectively. AC signals having different phases may be supplied to the first to third coil units, respectively. Signals having a phase difference of 120 degrees may be supplied to the first to third coil units, respectively. AC currents having a phase difference of 120 degrees may be supplied to the first to third coil units, respectively.

[0007] The magnet may include a first magnet portion including an N pole and an S pole facing in a second direction, a second magnet portion including an N pole and an S pole facing in the second direction, and a partition wall disposed between the first magnet portion and the second magnet portion, and the first magnet portion and the second magnet portion may be disposed in the first direction with the partition wall sandwiched therebetween.

[0008] The length of the first magnet portion in the first direction may be greater than the length of each of the first to third coil units in the first direction, and the length of the second magnet portion in the first direction may be greater than the length of each of the first to third coil units in the first direction.

[0009] The length of the first magnet portion in the first direction may be greater than the length of the first coil unit in the first direction. The length of the second magnet portion in the first direction may be greater than the length of the first coil unit in the first direction.

[0010] Each of the first to third coil units may have a ring shape including a hollow, and the length of the partition wall in the first direction may be greater than the length of the hollow in the first direction.

[0011] The first coil unit may have a ring shape including a hollow, and the length of the partition wall in the first direction may be greater than the length of the hollow of the first coil unit in the first direction.

[0012] The first pitch between the first magnet portion and the second magnet portion is larger than the second pitch between two adjacent coil units among the first to third coil units, and the first pitch may be the distance between the center of the first magnet portion and the center of the second magnet portion, and the second pitch may be the distance between the center of the hollow of any one of the two adjacent coil units and the center of the hollow of the remaining one.

[0013] The length of the magnet in the third direction may be smaller than the length of the magnet in the first direction, and the third direction may be perpendicular to both the first direction and the second direction. The length of the magnet in the third direction may be smaller than the lengths of each of the first to third coil units in the third direction.

[0014] The actuator may include a first sensor disposed within the hollow of the first coil unit, and a second sensor disposed within the hollow of the third coil unit.

[0015] According to another embodiment, the actuator includes a first lens barrel, a first magnet arranged in the first lens barrel, and a first coil that moves the first lens barrel in a first direction by interacting with the first magnet, wherein the first coil includes six coil units arranged in the first direction, the first magnet includes a first magnet portion including an N pole and an S pole, a second magnet portion including an S pole and an N pole, and a partition arranged between the first magnet portion and the second magnet portion, and the length of the first magnet portion in the first direction is greater than the length of each of the six coil units of the first coil in the first direction.

[0016] The length of the second magnet portion in the first direction may be greater than the length of each of the six coil units of the first coil. The first magnet may overlap three adjacent coil units of the six coil units of the first coil in a second direction perpendicular to the first direction. The length of the first magnet in the first direction may be greater than the sum of the lengths of two adjacent coil units of the six coil units. The length of the first magnet in the first direction may be less than the sum of the lengths of three adjacent coil units of the six coil units. Signals having a phase difference of 120 degrees may be supplied to each of the three adjacent coil units of the six coil units of the first coil.

[0017] An alternating current having a phase difference of 120 degrees may be supplied to each of the three adjacent coil units among the six coil units of the first coil.

[0018] According to another embodiment, the actuator includes a second lens barrel, a second magnet arranged in the second lens barrel, and a second coil that moves the second lens barrel in the first direction by interacting with the second magnet, wherein the second coil includes six coil units arranged in the first direction, and the second magnet includes a third magnet portion including an N pole and an S pole, a fourth magnet portion including an S pole and an N pole, and a partition wall arranged between the third magnet portion and the fourth magnet portion, and the length of the third magnet portion in the first direction may be greater than the length of each of the six coil units of the second coil in the first direction. [Effects of the Invention]

[0019] In this embodiment, due to the size and positional relationship between the magnet and the three coil units to which three-phase drive current is supplied, it is possible to obtain a uniform drive force in the optical axis direction without large fluctuations in the drive force in the optical axis direction, thereby improving the zooming operation and autofocusing accuracy of the lens assembly.

[0020] In addition, in this embodiment, by arranging six coil units sequentially in the optical axis direction, the travel distance of the magnet can be increased, thereby increasing the stroke range of the lens assembly. [Brief explanation of the drawings]

[0021] [Figure 1] FIG. 1 is a perspective view of an actuator according to an embodiment.

[0022] [Figure 2] FIG. 2 is an exploded perspective view of the actuator of FIG. 1.

[0023] [Figure 3a] 2 is a cross-sectional view of the actuator of FIG. 1 taken along the line AB.

[0024] [Figure 3b] FIG. 2 is a cross-sectional view of the actuator of FIG. 1 taken along the CD direction.

[0025] [Figure 4a] FIG. 2 is a first perspective view of a housing.

[0026] [Figure 4b] FIG. 2 is a second perspective view of the housing.

[0027] [Figure 5a] FIG. 2 is a first exploded perspective view of a lens unit and a driving unit.

[0028] [Figure 5b] FIG. 2 is a second exploded perspective view of the lens unit and the drive unit.

[0029] [Figure 6a] FIG. 2 is a plan view of a first magnet, a coil unit of a first coil, and a position sensor.

[0030] [Figure 6b] FIG. 3 is a schematic cross-sectional view of a coil unit including a first magnet and a first coil.

[0031] [Figure 7] FIG. 10 is a diagram showing a drive signal supplied to a coil unit of a first coil.

[0032] [Figure 8] FIG. 4 is a diagram showing first to third drive signals supplied to first to third coil units.

[0033] [Figure 9] FIG. 10 is a diagram showing electromagnetic forces between the first magnet and the first to third coil units to which the first to third drive signals are supplied.

[0034] [Figure 10] FIG. 10 is a diagram showing magnetic forces generated from the first to sixth coil units to which the first to third drive signals are supplied, and a magnetic force generated from the first magneto.

[0035] [Figure 11] FIG. 10 is a diagram showing the arrangement of two coil units and magnets according to a comparative example.

[0036] [Figure 12] 12 is a diagram showing the Lorentz force due to the interaction between the coil unit and the magnet in FIG. 11. FIG.

[0037] [Figure 13] 1 is a schematic diagram of a camera device according to an embodiment;

[0038] [Figure 14] 1 is a perspective view of an optical apparatus according to an embodiment;

[0039] [Figure 15] FIG. 15 is a configuration diagram of the optical device shown in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0040] Hereinafter, an embodiment of the present invention that can specifically achieve the above object will be described with reference to the accompanying drawings.

[0041] In the description of the embodiments, when an element is described as being "on or under" an element, "on or under" includes two elements that are in direct contact with each other or one or more other elements that are indirectly disposed between the two elements. Also, when "on or under" is used, it can mean not only above but also below an element.

[0042] Additionally, relational terms such as "first" and "second," "top / upper / upper" and "bottom / lower / lower" used hereinafter do not necessarily require or imply a certain physical or logical relationship or sequence between such entities or elements, but may be used only to distinguish one entity or element from another. Additionally, the same reference numerals refer to the same elements throughout the description of the figures.

[0043] Furthermore, unless otherwise specified, the terms "comprise," "constitute," or "have" used below mean that the corresponding element may be present, and should be interpreted as not excluding other elements but as including other elements. Furthermore, the terms "corresponding" used below may include at least one of the meanings of "opposite" or "overlapping."

[0044] Hereinafter, a camera device and an optical apparatus including the same according to an embodiment will be described with reference to the accompanying drawings. For convenience of explanation, the camera device according to the embodiment will be described using a Cartesian coordinate system (x, y, z). However, other coordinate systems may be used for explanation, and the embodiment is not limited thereto. In each drawing, the X-axis and Y-axis may refer to directions perpendicular to the Z-axis in the direction of the optical axis OA.

[0045] Furthermore, the Z-axis direction, which is the direction of the optical axis OA, is referred to as one of the "first direction," the second direction, and the third direction; the X-axis direction is referred to as the other one of the "first direction," the second direction, and the third direction; and the Y-axis direction is referred to as the remaining one of the "first direction," the second direction, and the third direction. Furthermore, the Y-axis is referred to as the "first axis," the Y-axis direction is referred to as the "first axis direction," the X-axis is referred to as the "second axis," and the X-axis direction is referred to as the "second axis direction." For example, the optical axis direction may be the optical axis OA of the lens unit 620 or a direction parallel to the optical axis.

[0046] The actuator according to the embodiment may perform an autofocusing function and a zoom function. The "autofocusing function" may be a function of automatically focusing on a subject by moving a lens in the optical axis direction according to the distance of the subject in order to obtain a clear image of the subject on the image sensor. The "zooming function" may be a function of increasing or decreasing the magnification of a distant subject through a zoom lens to capture the subject.

[0047] The camera device according to the embodiment can perform an image stabilization function. The image stabilization function can be a function of moving the lens in a direction perpendicular to the optical axis or tilting the lens with respect to the optical axis so as to offset vibrations (or movements) caused by the user's hand movement.

[0048] Hereinafter, the term "actuator" may be substituted with a lens moving device, a lens driving device, or a motor. Also, hereinafter, the term "camera device" may be substituted with a "camera," a "camera module," an "imaging device," or a "photographing device."

[0049] Fig. 1 is a perspective view of actuator 100 according to an embodiment, Fig. 2 is an exploded perspective view of actuator 100 of Fig. 1, Fig. 3a is a cross-sectional view of actuator 100 of Fig. 1 in the AB direction, Fig. 3b is a cross-sectional view of actuator 100 of Fig. 1 in the CD direction, Fig. 4a is a first perspective view of housing 610, Fig. 4b is a second perspective view of housing 610, Fig. 5a is a first exploded perspective view of lens unit 620 and drive unit 630, Fig. 5b is a second exploded perspective view of lens unit 620 and drive unit 630. In Fig. 1, covers 614, 615 and yokes 614, 615 shown in Figs. 2 and 5b are omitted.

[0050] The actuator 100 can move the lens assemblies 622, 624 in the optical axis direction, thereby performing autofocus and / or zoom functions, and can be alternatively referred to as the "first driving unit" or the "AF and zoom driving unit."

[0051] 1 to 5b, the actuator 100 may include a lens unit 620 and a driving unit 630 that moves the lens unit 620 in a first direction (for example, the optical axis direction or the Z axis direction).

[0052] The actuator 100 may include a housing 610 that houses or supports a lens unit 620 and a driving unit 630. For example, the lens unit 620 may be disposed within the housing 610. The lens unit 620 may be a "moving unit" that is movable in a first direction relative to a fixed unit. For example, the fixed unit may include the housing 610 and at least one of components coupled to the housing 610, such as the coil 120, the position sensor unit 170, the circuit board 190, the yokes 48 and 49, and the covers 48 and 49.

[0053] The lens unit 620 may alternatively be expressed as a “lens assembly.” For example, the lens unit 620 may include multiple lens assemblies.

[0054] 2, the lens unit 620 may include two lens assemblies 622 and 624. In other embodiments, the lens unit 630 may include three or more lens assemblies. For example, the lens assembly 622 and the lens assembly 624 may be arranged to correspond to, face each other, or overlap each other in the first direction.

[0055] The actuator 100 may further include a lens assembly 640 disposed in front of the lens unit 620. For example, the lens assembly 640 may be disposed on the opposite side of the lens assembly 624 with respect to the lens assembly 622. For example, the lens assembly 640 may be a fixed lens assembly whose position is fixed and does not move in the optical axis direction.

[0056] The lens assembly 640 may include a first lens array 642 (or a first lens group). For example, the lens assembly 640 may further include a lens barrel 641 coupled to the first lens array 642. The lens assembly 640 may further include a housing 643 coupled to the lens barrel 641. The housing 643 may be disposed in front of the housing 610. The housing 643 may be coupled to the housing 610.

[0057] Although lens assembly 640 is depicted as being included in actuator 100, in other embodiments, it may be a separate component not included in actuator 100. In still other embodiments, lens assembly 640 may be omitted.

[0058] In still other embodiments, any one of 640, 622, and 624 may be referred to as a “first lens assembly,” another one of 640, 622, and 624 may be referred to as a “second lens assembly,” and the remaining one of 640, 622, and 624 may be referred to as a “third lens assembly.” For example, in some embodiments, first lens assembly 640 may be a fixed lens group, and second lens assembly 622 and third lens assembly 624 may each include a moving lens group or lens groups.

[0059] For example, the first lens assembly 640 may function as a condenser that focuses parallel light at a specific position, and the second lens assembly 622 may function as a variator that refocuses the image focused by the first lens assembly 640, which is a condenser, at another position.

[0060] Meanwhile, the magnification of the second lens assembly 622 can change significantly as the distance to the object or the image distance changes significantly, and the second lens assembly 622, which is a magnification changer, can play an important role in changing the focal length or magnification of the optical system. Meanwhile, the image point formed by the second lens assembly 6220, which is a magnification changer, may have slight differences depending on the position.

[0061] In addition, the third lens assembly 624 may perform a position compensation function for the image formed by the magnification variable element. For example, the third lens assembly 624 may perform a compensator function that accurately focuses the image point formed by the second lens assembly 622, which is a magnification variable element, onto the pixel of the image sensor 540.

[0062] For example, the second lens assembly 622 may be a zoom lens assembly that performs a zooming function, and the third lens assembly 624 may be a focus lens assembly that performs a focusing function.

[0063] The housing 610 may alternatively be referred to as a "base," a "holder," or a case.

[0064] The housing 610 may have a polyhedron (for example, a rectangular parallelepiped) shape with an internal space to accommodate or support the lens unit 620 and the drive unit 630 .

[0065] For example, the housing 610 may include a body 612 including an upper portion (or upper plate) 142A, a lower portion (or lower plate) 142B, and a plurality of side portions 141-1 to 141-4 disposed between the upper portion 142A and the lower portion 142B.

[0066] The side portions 141-1 to 141-4 may alternatively be expressed as "side plates" or "side walls." For example, the first side portion 141-1 and the second side portion 141-2 may face each other or be located opposite each other in the second direction (e.g., the Y-axis direction), and the third side portion 141-3 and the fourth side portion 141-4 may face each other or be located opposite each other in the first direction.

[0067] A first opening (or first hole) 41A for exposing one end of the lens portion 620 may be formed on the side 141-3 of the housing 610, and a second opening (or second hole) 41B for exposing the other end of the lens portion 620 may be formed on the side 141-4 of the housing 610.

[0068] Additionally, an opening (or third hole) 41C for disposing or seating the first coil 120A may be formed in the side 141-1 of the housing 610, and an opening (or fourth hole) 41D for disposing or seating the second coil 120B may be formed in the side 141-4 of the housing 610. Each of the openings 41C and 41D is in the form of a through-hole, but in other embodiments, they may be in the form of a recess. For example, each of the openings 41C and 41D may include two or more openings. In other embodiments, each of the openings 41C and 41D may be a single opening.

[0069] The housing 610 may include at least one guide portion 43 formed on the inner surface of the housing 610 to guide the movement of the lens portion 620 in the optical axis direction.

[0070] For example, at least one guide portion 43 may include at least one protrusion 44A-44D formed on at least one of upper portion 142A or lower portion 142B of housing 610. In addition, guide portion 43 may include at least one groove 43A-43D formed between at least one protrusion 44A-44D and a side portion of housing 610.

[0071] For example, the first protrusion 44A may be disposed on the inner surface of the lower portion 142B of the housing 610, and the second protrusion 44B may be formed on the inner surface of the upper portion 142A of the housing 610 so as to correspond to, face, or overlap with the first protrusion 44A in the third direction (e.g., the X-axis direction). The first and second protrusions 44A and 44B may be disposed on the inner surface of the side portion 141-1 of the housing 610, spaced apart by a predetermined distance.

[0072] For example, the first groove 43A may be formed on the inner surface of the lower portion 142B of the housing 610. The first groove 43A may be disposed adjacent to the lower portion of the inner surface of the side portion 141-1 of the housing 610. For example, the first groove 43A may be formed between the first protrusion 44A and the inner surface of the side portion 141-1 of the housing 610.

[0073] For example, the second groove 43B may be formed on the inner surface of the top portion 142A of the housing 610. The second groove 43B may be disposed adjacent to an upper portion of the inner surface of the side portion 141-1 of the housing 610. For example, the second groove 43B may be formed between the second protrusion 44B and the inner surface of the side portion 141-1 of the housing 610.

[0074] For example, the third protrusion 44C may be disposed on the inner surface of the lower portion 142B of the housing 610, and the fourth protrusion 44D may be formed on the inner surface of the upper portion 142A of the housing 610 so as to correspond to, face, or overlap with the third protrusion 44C in the third direction (X-axis direction). The third and fourth protrusions 44C and 44D may be disposed on the inner surface of the side portion 141-2 of the housing 610, spaced apart by a predetermined distance.

[0075] For example, the third groove 43C may be formed on the inner surface of the lower portion 142B of the housing 610. The third groove 43C may be disposed adjacent to the lower portion of the inner surface of the side portion 141-2 of the housing 610. For example, the third groove 43C may be formed between the third protrusion 44C and the inner surface of the side portion 141-2 of the housing 610.

[0076] For example, the fourth groove 43D may be formed on the inner surface of the upper portion 142A of the housing 610.

[0077] For example, the fourth groove 43D may be disposed adjacent to an upper portion of the inner surface of the side portion 141-2 of the housing 610. For example, the fourth groove 43D may be formed between the fourth protrusion 44D and the inner surface of the side portion 141-2 of the housing 610.

[0078] For example, grooves 42A and 42B for receiving or arranging at least a portion of rolling members B1 to B8 may be formed on the inner surface of at least one of side portions 141-1 and 141-2 of housing 610. For example, grooves (e.g., 42A and 42B) may be formed on the inner surface of side portions 141-1 and 141-2 of housing 610 adjacent to at least one of first to fourth grooves 43A to 43D. Although two grooves (e.g., 42A and 42B) are formed in FIG. 4a, in other embodiments, grooves corresponding to the first to fourth grooves 43A to 43D may be formed.

[0079] The support portion 29B of the lens assembly 622 is disposed in the first and second grooves 43A and 43B, and the first and second protrusions 44A and 44B can guide the movement of the support portion 29B of the lens assembly 622.

[0080] Furthermore, the support portion 39B of the lens assembly 624 is disposed in the third and fourth grooves 43C and 43D, and the third and fourth protrusions 44C and 44D can guide the movement of the support portion 39B of the lens assembly 624.

[0081] The first to fourth protrusions 44A to 44D and the first to fourth grooves 43A to 43D can stably guide the movement of the lens assemblies 622, 624, and can prevent the support parts 29B, 39B from falling out of the grooves 43A to 43D or colliding with the lens part 620 due to an impact or the like.

[0082] The housing 610 may include an opening 621 formed in the upper portion 142A and exposing a portion of the lens portion 620. The housing 610 may further include a cover 614 that covers the opening 621. For example, the housing 610 may include an opening 622 formed in the lower portion and exposing another portion of the lens portion 620. The housing 610 may further include a cover 615 that covers the opening 622. In other embodiments, at least one of the openings 621 and 622 may not be formed, and the covers 614 and 615 may be omitted.

[0083] For example, the housing 610 may be formed by injection molding. For example, at least one groove 28 may be formed on the outer surface of the upper portion 142A of the housing 610 to correspond to, face, or overlap with the protrusions 44B and 44D. Here, if the thickness of the injection molding material is large, it is difficult to injection mold the desired shape, so grooves are formed to correspond to the protrusions. Also, for example, at least one groove (not shown) may be formed on the outer surface of the lower portion 142B of the housing 610 to correspond to, face, or overlap with the protrusions 44A and 44C.

[0084] The lens unit 620 may include a second lens assembly 622 and a third lens assembly 624 spaced apart from each other.

[0085] 5a and 5b, the second lens assembly 622 may include a first lens holder 29. The second lens assembly 622 may also include a second lens array (or second lens group) 49 disposed in or coupled to the first lens holder 29. The lens holder may be alternatively expressed as a "bobbin." For example, the second lens array 49 may include a single lens or multiple lenses.

[0086] For example, the first lens holder 29 may include a first lens barrel 29A on which the second lens array 49 is disposed or coupled. For example, the first lens barrel 29A may be moved in a first direction by interaction between the first magnet 130A and the first coil 120A.

[0087] In addition, the first lens holder 29 may include a first support part 29B connected or coupled to the first lens barrel 29A. For example, the first lens barrel 29A may have a barrel shape and may include an opening (or hole) 29C to which the second lens array 49 is coupled.

[0088] A first side surface (or a first face) of the first support portion 29B may be connected or coupled to the first lens barrel 29A. The first support portion 29B may correspond to, face, or overlap with the side portion 141-1 of the housing 610 in the second direction (e.g., the Y-axis direction). For example, the first support portion 29B may protrude in the first direction from the front surface of the first lens barrel 29A.

[0089] The first support portion 29B may include at least one first groove (or first guide groove) 13A, 13B for accommodating at least a portion of the rolling members B1 to B4. For example, the at least one first groove 13A, 13B may be formed on a second side surface (or second face) of the first support portion 29B. For example, the second side surface (or second face) of the first support portion 29B may be the face opposite to the first side surface (or first face) of the first support portion 29B.

[0090] For example, at least one first groove 13A, 13B of the first support portion 29B may correspond to, face, or overlap with the side 141-1 of the housing 610. For example, at least one first groove 13A of the first support portion 29B may correspond to, face, or overlap with the groove 42A formed in the side 141-1 of the housing 610.

[0091] For example, at least one groove 13A may be formed on the lower side of the second side surface of the first support portion 29B, and at least one groove 13B may be formed on the upper side of the second side surface of the first support portion 29B.

[0092] The third lens assembly 624 may include the second lens holder 39. The third lens assembly 624 may also include a third lens array (or a third lens group) 59 disposed on or coupled to the second lens holder 39. For example, the third lens array 59 may include a single lens or multiple lenses.

[0093] For example, the second lens holder 39 may include a second lens barrel 39A on which the third lens array 59 is disposed or coupled. For example, the second lens barrel 39A may be moved in a first direction by an interaction between the second magnet 130B and the second coil 120B.

[0094] In addition, the second lens holder 39 may include a second support portion 39B connected or coupled to the second lens barrel 39A. For example, the second lens barrel 39A may have a barrel shape and may include an opening (or hole) 39C to which the third lens array 59 is coupled.

[0095] A first side surface (or a first face) of the second support portion 39B may be connected or coupled to the second lens barrel 39A. The second support portion 39B may correspond to, face, or overlap with the side portion 141-2 of the housing 610 in the second direction (e.g., the Y-axis direction). For example, the second support portion 39B may protrude in the first direction from the rear surface of the second lens barrel 39A. For example, the second support portion 39B may protrude in the opposite direction from the first support portion 29B.

[0096] The second support portion 39B may include at least one second groove (or second guide groove) 13C, 13D for accommodating at least a portion of the rolling members B5 to B8. For example, the at least one second groove 13C, 13D may be formed on a second side surface (or second face) of the second support portion 39B. For example, the second side surface (or second face) of the second support portion 39B may be the face opposite to the first side surface (or first face) of the second support portion 39B.

[0097] For example, at least one second groove 13C, 13D of the second support portion 39B may correspond to, face, or overlap with the side 141-2 of the housing 610. For example, at least one second groove 13D of the second support portion 39B may correspond to, face, or overlap with the groove 42B formed in the side 141-2 of the housing 610.

[0098] For example, at least one groove 13C may be formed on the lower side of the second side surface of the second support portion 39B, and at least one groove 13D may be formed on the upper side of the second side surface of the second support portion 39B.

[0099] The lenses included in each of the second and third lens arrays 49 and 59 may be sequentially arranged or aligned in the first direction. For example, each of the second and third lens arrays 49 and 59 may include optical lenses of various shapes. For example, each of the second and third lens arrays 49 and 59 may include at least one of a front lens having positive power and a rear lens having negative power.

[0100] The distance between the second lens assembly 622 and the third lens assembly 624 in the optical axis direction can be changed by the driver 630 .

[0101] Each of the grooves 42A, 42B and the first and second support grooves 13A-13D of the housing 610 may have a shape that allows contact with the rolling members B1-B8 at two or more points. For example, each of the grooves 42A, 42B and the first and second support grooves 13A-13D of the housing 610 may be polygonal (e.g., rectangular), V-shaped, or U-shaped.

[0102] The protrusions 44A-44D of the housing 610, the grooves 42A and 42B of the housing 610, and / or the grooves 13A-13D of the first and second support portions 29B and 39B can prevent decentering and tilting when the second and third lens assemblies 622 and 624 move. Therefore, by ensuring good alignment between the plurality of lens arrays 49 and 59, changes in the angle of view or defocusing can be prevented, and the image quality and resolution of the camera device 100 can be significantly improved.

[0103] The actuator 100 may include rolling members B1 to B8 arranged between the housing 610 and the lens unit 620. The rolling members B1 to B8 may be in contact with the housing 610 and the lens unit 620. For example, the rolling members B1 to B8 may be arranged between the side portions 141-1 and 141-2 of the housing 610 and the support portions 29B and 39B of the lens unit 620. The rolling members B1 to B8 may be in contact with the side portions 141-1 and 141-2 of the housing 610 and the support portions 29B and 39B of the lens unit 620.

[0104] For example, the rolling members B1 to B8 can be disposed between the inner surfaces (or grooves) 42A and 42B of the side portions 141-1 and 141-2 of the housing 610 and the grooves 13A to 13D of the support portions 29B and 39B. The rolling members B1 to B8 can contact the inner surfaces (or grooves) 42A and 42B of the side portions 141-1 and 141-2 of the housing 610 and the grooves 13A to 13D of the support portions 29B and 39B.

[0105] The rolling members B1 to B8 may alternatively be referred to as "ball members," "balls," or "ball bearings." For example, the rolling members B1 to B8 may include at least one ball. Each of the balls B1 to B8 may have a circular shape and a diameter large enough to support the movement of the lens unit 620. In another embodiment, the rolling members may be in the form of rollers. For example, the rolling members B1 to B8 may be made of a metal material, a plastic material, or a resin material.

[0106] The rolling members B1 to B8 can support the lens unit 620. When the lens unit 620 moves in the first direction, the rolling members B1 to B8 roll between the lens unit 620 and the housing 610, thereby reducing friction between the lens unit 620 and the housing 610. That is, as the rolling members B1 to B8 roll, the lens unit 620 comes into contact with the rolling members B1 to B8, and can be moved in a sliding manner in the first direction by the guide unit 43 of the housing 610.

[0107] For example, the rolling members may include first rolling members B1-B4 and second rolling members B5-B8. The first rolling members B1-B4 may be disposed between the guide portion 43 of the housing 610 and the second lens assembly 622 (e.g., the first support portion 29B). The second rolling members B5-B8 may be disposed between the guide portion 43 of the housing 610 and the third lens assembly 624 (e.g., the second support portion 39B).

[0108] Next, the driving unit 630 will be described.

[0109] The driver 630 can move the second lens assembly 622 in a first direction and the third lens assembly 624 in a first direction. For example, the driver 630 can move at least one lens group, for example, the second lens group or the third lens group, in the first direction or along the optical axis.

[0110] The driving unit 630 may include a magnet 130 disposed in the lens unit 620 and a coil 120 disposed in the housing 610. In another embodiment, the magnet may be disposed in the housing and the coil may be disposed in the lens unit.

[0111] The coil 120 may include a first coil 120A disposed on a first side 141-1 of the housing 610 and a second coil 120B disposed on a second side 141-2 of the housing 610.

[0112] The first coil 120A may include multiple coil units. For example, the multiple coil units of the first coil 120A may be sequentially arranged or aligned in a first direction. For example, the multiple coil units of the first coil 120A may be spaced apart or aligned at equal intervals. In other embodiments, the multiple coil units of the first coil may be sequentially or continuously arranged or aligned so as to be in contact with each other.

[0113] 5a and 5b, the first coil 120A can include six coil units 31 to 36. In other embodiments, the first coil 120A can include three coil units 31 to 33. Alternatively, in other embodiments, the first coil can include four or more coil units.

[0114] The second coil 120B may include multiple coil units. For example, the multiple coil units of the second coil 120B may be sequentially arranged or aligned in a first direction. For example, the multiple coil units of the second coil 120B may be spaced apart or aligned at equal intervals. In other embodiments, the multiple coil units of the second coil may be sequentially or continuously arranged or aligned so as to be in contact with each other.

[0115] 5a and 5b, the second coil 120B can include six coil units 41 to 46. In other embodiments, the second coil 120B can include three coil units 41 to 43. Alternatively, in other embodiments, the second coil can include four or more coil units.

[0116] 6a, each of the coil units of the first coil 120A and the second coil 120B may have a closed curve shape or a ring shape having a hollow (or hole) 201. For example, each of the coil units of the first coil 120A and the second coil 120B may have a coil ring shape wound in a clockwise or counterclockwise direction based on (or centered on) a third axis parallel to a second direction (e.g., the Y-axis direction). For example, the hollow or hole of the coil unit of the first coil 120A may face the first magnet 130A in the second direction (e.g., the Y-axis direction). Alternatively, for example, the hollow or hole of the coil unit of the second coil 120B may face the second magnet 130B in the second direction (e.g., the Y-axis direction).

[0117] A first drive signal (eg, a first current or a first voltage) may be applied to the first coil 120A, and a second drive signal (eg, a second current or a second voltage) may be applied to the second coil 120B.

[0118] The magnet 130 may include a first magnet 130A disposed on or coupled to the second lens assembly 622 and a second magnet 130B disposed on or coupled to the third lens assembly 624 .

[0119] For example, the first magnet 130A may be disposed on or coupled to the first lens holder 29 of the second lens assembly 622, and the second magnet 130B may be disposed on or coupled to the second lens holder 39 of the third lens assembly 624.

[0120] For example, the first magnet 130A may be disposed on or coupled to the first support portion 29B of the first lens holder 29. The second magnet 130B may be disposed on or coupled to the second support portion 39B of the second lens holder 39.

[0121] For example, each of the first and second magnets 130A, 130B may be a bipolar magnet including two north poles and two south poles, or in other embodiments, each of the first and second magnets may be a monopolar magnet including one north pole and one south pole.

[0122] For example, in the second direction (e.g., the Y-axis direction), first magnet 130A may correspond to, face, or overlap at least three of the coil units of first coil 120A. Also, for example, second magnet 130B may correspond to, face, or overlap at least three of the coil units of second coil 120B in the second direction (e.g., the Y-axis direction).

[0123] The second lens assembly 622 can move in the first direction due to the electromagnetic force generated by the interaction between the first coil 120A and the first magnet 130A, and the third lens assembly 624 can move in the first direction due to the electromagnetic force generated by the interaction between the second coil 120B and the second magnet 130B.

[0124] Controlling the first drive signal and the second drive signal can control the movement of each of the second lens assembly 622 and the third lens assembly 624. Controlling the movement of each of the second lens assembly 622 and the third lens assembly 624 can control the position (or displacement) of each of the second lens assembly 622 and the third lens assembly 624, thereby enabling zooming and autofocusing of the camera device 200.

[0125] The driving unit 630 may further include a first yoke 19A disposed on the first lens holder 29 and a second yoke 19B disposed on the second lens holder 39. The first yoke 19A may increase the electromagnetic force generated by the interaction between the first magnet 130A and the first coil 120A, and the second yoke 19B may increase the electromagnetic force generated by the interaction between the second magnet 130B and the second coil 120B. The first and second yokes 19A and 19B may increase the driving force for moving the lens unit 620, thereby reducing power consumption for autofocusing or zoom driving.

[0126] For example, the first yoke 19A may be disposed between the first magnet 130A and the first lens holder 29, and the second yoke 19B may be disposed between the second magnet 130B and the second lens holder 39. For example, the first yoke 19A may be disposed on the first support portion 29B, and the second yoke 19B may be disposed on the second support portion 39B.

[0127] For example, the first yoke 19A may include a body (or "first portion") that faces the first magnet 130A in the second direction (e.g., the Y-axis direction) and is coupled to the first lens holder 29, and an extension (or "second portion") that extends from the body and is positioned on one or more sides of the first magnet 130A.

[0128] The driver 630 may include a circuit board (or board) 190 electrically connected to the coil 120. For example, the circuit board 190 may be a printed circuit board.

[0129] The circuit board 190 may be disposed in the housing 610. The circuit board 190 may include a first board 192 disposed on or coupled to a first side 141-1 of the housing 610 and a second board 194 disposed on or coupled to a second side 141-2 of the housing 610.

[0130] The first coil 120A may be disposed or mounted on a first surface of the first substrate 192. Here, the first surface of the first substrate 192 may be a surface facing the first side 141-1 of the housing 610 in the second direction (e.g., the Y-axis direction). The second coil 120B may be disposed or mounted on a first surface of the second substrate 194. Here, the first surface of the second substrate 194 may be a surface facing the second side 141-2 of the housing 610 in the second direction (e.g., the Y-axis direction).

[0131] The first substrate 192 may be electrically connected to the first coil 120A. The first substrate 192 may also include a plurality of terminals (not shown). For example, the plurality of terminals of the first substrate 192 may be formed on a second surface of the first substrate 192. For example, the second surface of the first substrate 192 may be the surface opposite to the first surface of the first substrate 192.

[0132] The second substrate 194 may be electrically connected to the second coil 120B. For example, the second substrate 194 may include a plurality of terminals (not shown). For example, the plurality of terminals of the second substrate 194 may be formed on a second surface of the second substrate 194. For example, the second surface of the second substrate 194 may be the surface opposite to the first surface of the second substrate 194.

[0133] The actuator 630 may further include a third yoke 48 (see FIG. 5a) disposed on the second surface of the first substrate 192 and a fourth yoke 49 disposed on the second surface of the second substrate 194. The fourth yoke may have the same shape as the third yoke. The third yoke 48 and the fourth yoke 49 may increase the electromagnetic force due to the interaction between the magnet 130 and the coil 120.

[0134] The driving unit 630 may include a position sensor unit 170 for performing feedback driving for accurate zooming and AF operation.

[0135] The position sensor unit 170 may include a first position sensor unit 170A for sensing the position or displacement of the second lens assembly 622 and a second position sensor unit 170B for sensing the position or displacement of the third lens assembly 624.

[0136] For example, the first position sensor unit 170A may be disposed or mounted on the first substrate 192 and electrically connected to the first substrate 192. The second position sensor unit 170B may be disposed or mounted on the second substrate 194 and electrically connected to the second substrate 194.

[0137] For example, the first position sensor unit 170A may be disposed, coupled, or mounted on a first surface of the first substrate 192, and the second position sensor unit 170B may be disposed, coupled, or mounted on a first surface of the second substrate 194.

[0138] The first position sensor unit 170A may include a first sensor 71A and a second sensor 71B. For example, the first sensor 71A and the second sensor 71B may be arranged spaced apart from each other in the first direction. For example, the first sensor 71A may be disposed within the hollow of one of the first to third coil units 31 to 33 (e.g., 31). For example, the second sensor 71B may be disposed within the hollow of another of the first to third coil units 31 to 33 (e.g., 33). In another embodiment, each of the two sensors 71A and 71B may be disposed within a corresponding one of two adjacent coil units among the first to third coil units 31 to 33.

[0139] The first position sensor unit 170A may also include a third sensor 71C and a fourth sensor 71D. For example, the third sensor 71C and the fourth sensor 71D may be arranged spaced apart from each other in the first direction. For example, the third sensor 71C may be disposed within the hollow of one of the fourth to sixth coil units 34 to 36 (e.g., 34). For example, the fourth sensor 71D may be disposed within the hollow of another of the fourth to sixth coil units 34 to 36 (e.g., 36). In another embodiment, each of the two sensors 71C and 71D may be disposed within a corresponding one of two adjacent coil units among the fourth to sixth coil units 34 to 36.

[0140] The second position sensor unit 170B may include a first sensor 72A and a second sensor 72B. For example, the first sensor 72A and the second sensor 72B may be arranged spaced apart from each other in the first direction. For example, the first sensor 72A may be disposed within the hollow of one of the first to third coil units 41 to 43 (e.g., 41). For example, the second sensor 72B may be disposed within the hollow of another of the first to third coil units 41 to 43 (e.g., 43). In another embodiment, each of the two sensors 72A and 72B may be disposed within a corresponding one of two adjacent coil units among the first to third coil units 41 to 43.

[0141] The second position sensor unit 170B may also include a third sensor 72C and a fourth sensor 72D. For example, the third sensor 72C and the fourth sensor 72D may be arranged spaced apart from each other in the first direction. For example, the third sensor 72C may be disposed within the hollow of one of the fourth to sixth coil units 44 to 46 (e.g., 44). For example, the fourth sensor 72D may be disposed within the hollow of another of the fourth to sixth coil units 44 to 46 (e.g., 46). In another embodiment, each of the two sensors 72C and 72D may be disposed within a corresponding one of two adjacent coil units among the fourth to sixth coil units 44 to 46.

[0142] For example, the first to fourth sensors 71A to 71D of the first position sensor unit 170A may be hall sensors or TMR (Tunnel MagnetoResistance) sensors, respectively. Also, the first to fourth sensors 72A to 72D of the second position sensor unit 170B may be hall sensors or TMR sensors, respectively. For example, the TMR sensors may be TMR linear magnetic field sensors.

[0143] In another embodiment, at least one of the first to fourth sensors may be a driver IC including a Hall sensor.

[0144] For example, each of the first to fourth sensors 71A to 71D may include two input terminals to which a drive signal (or drive current) is supplied and two output terminals for outputting an output signal (for example, an output voltage).

[0145] For example, the two output terminals of the first sensor 71A and the two output terminals of the second sensor 71B may be connected in parallel, and the two output terminals of the third sensor 71C and the two output terminals of the fourth sensor 71D may be connected in parallel.

[0146] For example, the parallel-connected output terminals of the first and second sensors 71A and 71B and the parallel-connected output terminals of the third and fourth sensors 71C and 71D may be connected in series. That is, the output voltages of the parallel-connected first and second sensors 71A and 71B and the output voltages of the parallel-connected third and fourth sensors 71C and 71D may be summed. The summed voltage (or "final output voltage") may be used to sense the displacement or position of the first magnet 130A or the second lens assembly 622.

[0147] In other embodiments, each of the first to fourth sensors 71A to 71D can output an output signal (or an output voltage), and one or more of the output signals output from the first to fourth sensors 71A to 71D can be used to sense the displacement or position of the first magnet 130A or the second lens assembly 622.

[0148] The description of the output signals and the connection relationships of the output terminals of the first to fourth sensors 71A to 71D can be applied or analogously applied to the first to fourth sensors 72A to 72D of the second position sensor unit 170B.

[0149] For example, within the stroke range of the second lens assembly 622 (or the first lens holder 29) in the first direction, the first position sensor unit 170A may face or overlap the first magnet 130A in the second direction (eg, the Y-axis direction).

[0150] For example, within the stroke range of the third lens assembly 624 (or the second lens holder 39) in the first direction, the second position sensor unit 170B may face or overlap the second magnet 130B in the second direction (eg, the Y-axis direction).

[0151] The first position sensor unit 170A can sense the strength of the magnetic field of the first magnet 130A. For example, the first position sensor unit 170A can sense the movement of the first magnet 130A (or the second lens assembly 622) in the optical axis direction. For example, the displacement or position of the first magnet 130A or the second lens assembly 622 can be sensed using the final output voltage of the first position sensor unit 170A. Alternatively, the displacement or position of the first magnet 130A or the second lens assembly 622 can be sensed using one or more of the output signals output from the first to fourth sensors 71A to 71D.

[0152] The second position sensor unit 170B can sense the strength of the magnetic field of the second magnet 130B. For example, the second position sensor unit 170B can sense the movement of the second magnet 130B (or the third lens assembly 624) in the optical axis direction. For example, the displacement or position of the second magnet 130B or the third lens assembly 624 can be sensed using the final output voltage of the second position sensor unit 170B. Alternatively, the displacement or position of the second magnet 130B or the third lens assembly 624 can be sensed using one or more of the output signals output from the first to fourth sensors 72A to 72D.

[0153] In Figures 5a and 5b, the first position sensor unit 170A and the second position sensor unit 170B each include four sensors, but in other embodiments, the first position sensing unit and the second position sensing unit may each include one or more sensors.

[0154] Figure 6a is a plan view of the first magnet 130A, coil units 31 to 33 of the first coil 120A, and position sensors 71; 71A to 71D, Figure 6b is a schematic cross-sectional view of the first magnet 130A and coil units 31 to 36 of the first coil 120A, Figure 7 shows the drive signals supplied to the coil units 31 to 33 of the first coil 120A, Figure 8 shows the first to third drive signals supplied to the first to third coil units 31 to 33, Figure 9 shows the electromagnetic forces between the first magnet 130A and the first to third coil units 31 to 33 to which the first to third drive signals have been supplied, and Figure 10 shows the magnetic forces generated from the first to sixth coil units 31 to 36 to which the first to third drive signals have been supplied, and the magnetic forces generated from the first magnet 130A.

[0155] 6a and 6b, the first magnet 130A may be a bipolar magnetized magnet including two north poles and two south poles or a four-pole magnet. For example, the first magnet 130A may include a first magnet portion 401, a second magnet portion 402, and a partition wall 403 disposed between the first magnet portion 401 and the second magnet portion 402. Here, the magnet portion may be referred to as a "magnet unit," and the partition wall 403 may be referred to as a "non-magnetic partition wall."

[0156] The first magnet part 401 may include a first polarity region 41A and a second polarity region 41B. For example, the first polarity region 41A may be an S pole (or an N pole), and the second polarity region 41B may be an N pole (or an S pole). The first magnet part 401 may also include a first boundary between the first polarity region 41A and the second polarity region 41B. The first boundary may be a portion that is substantially non-magnetic and may include a section with almost no polarity, and may be a naturally occurring portion that forms a magnet consisting of one N pole and one S pole.

[0157] The second magnet part 402 may include a third polarity region 42A and a fourth polarity region 42B. For example, the third polarity region 42A may be a north pole (or a south pole), and the fourth polarity region 42B may be a south pole (or a north pole). The second magnet part 402 may also include a second boundary between the third polarity region 42A and the fourth polarity region 42B. The second boundary may include a section that is substantially non-magnetic and has almost no polarity, and may be a naturally occurring portion that forms a magnet consisting of one north pole and one south pole.

[0158] The partition 403 separates or isolates the first magnet part 401 and the second magnet part 402, and may be a part that is substantially non-magnetic and has almost no polarity. For example, the partition may be a non-magnetic material, a gap, or air. For example, the partition may be expressed as a "neutral zone" or a "neutral region."

[0159] The partition wall 403 is a portion that is artificially formed when the first magnet portion 401 and the second magnet portion 402 are magnetized, and the width of the partition wall 403 may be greater than the width of the first boundary portion (or the width of the second boundary portion). Here, the width of the partition wall 403 may be the length in the direction from the first magnet portion 401 toward the second magnet portion 402. The width of the first boundary portion (or the second boundary portion) may be the length of the first boundary portion (or the second boundary portion) in the direction from the north pole to the south pole of each of the first and second magnet portions 401, 402.

[0160] The first magnet part 401 and the second magnet part 402 may be arranged in the first direction with the partition wall 403 interposed therebetween. For example, the first magnet part 401 and the second magnet part 402 may be arranged facing each other in the first direction with the partition wall 403 interposed therebetween.

[0161] The first magnet portion 401 and the second magnet portion 402 may be arranged so that their opposite polarities face each other in the optical axis direction. For example, the first magnet portion 401 and the second magnet portion 402 may be arranged so that they face or oppose each other in the optical axis direction. Furthermore, for example, the north pole and south pole of the first magnet portion 401 and the second magnet portion 402 may be arranged so that they face or oppose each other in a second direction (e.g., the Y-axis direction).

[0162] For example, the north pole of the first magnet part 401 may be positioned closer to the coil units 31 to 36 of the first coil 120A than the south pole, and the south pole of the second magnet part 402 may be positioned closer to the coil units 31 to 36 of the first coil 120A than the north pole, but in other embodiments, the positions of the north pole and south pole may be reversed.

[0163] In other embodiments, the first magnet portion and the second magnet portion of the first magnet may be arranged to face each other in the second direction (eg, the Y-axis direction) or the third direction (eg, the X-axis direction).

[0164] In another embodiment, the first magnet may be a two-pole magnet including one north pole and one south pole. For example, the one north pole and one south pole of the first magnet may be arranged to face each other in the optical axis direction. In yet another embodiment, the one north pole and one south pole of the first magnet may be arranged to face each other in a second direction (e.g., the Y-axis direction).

[0165] The description of the first magnet 130A applies or can be applied by analogy to the second magnet 130B.

[0166] In the second direction (e.g., the Y-axis direction), the first magnet 130A can overlap with three adjacent coil units among the coil units 31 to 36 of the first coil 120A.

[0167] For example, the length L11 of the first magnet 130A in the first direction may be smaller than the total length L4 of three adjacent coil units (e.g., 31 to 33) in the first direction (L11 < L4). For example, the total length L4 may be the sum of the lengths L21, L22, and L23 of the respective optical axis directions of the three coil units and the separation distance d1 between the coil units.

[0168] For example, L11 may be smaller than the sum of the lengths of three adjacent coil units (e.g., 31 to 33) in the first direction.

[0169] For example, the length L11 of the first magnet 130A in the first direction may be larger than the total length of two adjacent coil units (e.g., 31 and 32) among the plurality of coil units 31 to 36 in the first direction. For example, the total length of two adjacent coil units (e.g., 31 to 32) in the first direction may be the sum of the lengths of the respective optical axis directions of the two adjacent coil units and the separation distance between the adjacent coil units. For example, L11 may also be larger than the sum of the lengths of two adjacent coil units (e.g., 31 and 32) in the first direction.

[0170] In another embodiment, the length L11 of the first magnet 130A in the first direction may be the same as the total length L4 of three adjacent coil units (e.g., 31 to 33) in the first direction.

[0171] [[ID=!9]] For example, the length L11 of the first magnet 130A in the first direction may be smaller than the value obtained by adding the lengths (e.g., L21, L22, L23) of three adjacent coil units in the first direction. In another embodiment, the length L11 of the first magnet 130A in the first direction may be the same as the value obtained by adding the lengths (e.g., L21, L22, L23) of three adjacent coil units in the first direction.

[0172] The length L11 of the first magnet 130A in the first direction may be greater than the sum of the lengths in the first direction of two of the three adjacent coil units.

[0173] For example, the length L11 of the first magnet 130A in the first direction may be greater than the length L12 of the first magnet 130A in the third direction (for example, the X-axis direction) (L11 > L12).

[0174] For example, the length L12 of the first magnet 130A in the third direction (for example, the X-axis direction) may be smaller than the length L31 of the coil unit of the first coil 120A in the third direction (for example, the X-axis direction) (L12 < L31). In other embodiments, the length L12 of the first magnet 130A in the third direction (for example, the X-axis direction) may be the same as or greater than the length L31 of the coil unit of the first coil 120A in the third direction (for example, the X-axis direction).

[0175] For example, each of the coil units 31 - 36 of the first coil 120A may have the same shape. Also, for example, each of the coil units of the first coil 120A may have the same number of turns (or rotations). For example, the lengths L21, L22, L23 of each of the coil units 31 - 36 of the first coil 120A in the first direction may be the same. Also, for example, the length H2 of each of the coil units 31 - 33 of the first coil 120A in the second direction (for example, the Y-axis direction) may be the same. In other embodiments, at least one of the number of turns, the length in the first direction, or the length in the second direction of the coil units of the first coil may be different.

[0176] For example, the length L31 of each coil unit of the first coil 120A in the third direction (for example, the X-axis direction) may be greater than the length L21 in the first direction (L31 > L21). In other embodiments, the length of each coil unit in the third direction (for example, the X-axis direction) may be the same as or smaller than the length in the first direction.

[0177] For example, the length L2 in the first direction of any one polar region of the first magnet 130A may be greater than the lengths L21, L22, or L23 in the first direction of the coil units (for example, 31) of the first coil 120A (L2 > L21, L2 > L22, L2 > L23).

[0178] For example, the length L2 in the first direction of the first magnet portion 401 may be greater than the lengths L21, L22, or L23 in the first direction of the coil units (for example, 31) of the first coil 120A. For example, the length L2 in the first direction of the first magnet portion 401 may be greater than the respective lengths L21, L22, or L23 in the first direction of the coil units (for example, 31 to 36) of the first coil 120A.

[0179] Also, for example, the length L2 in the first direction of the second magnet portion 402 may be greater than the lengths L21, L22, or L23 in the first direction of the coil units (for example, 31) of the first coil 120A. For example, the length L2 in the first direction of the second magnet portion 402 may be greater than the respective lengths L21, L22, or L23 in the first direction of the coil units (for example, 31 to 36) of the first coil 120A.

[0180] For example, the length H1 of the first magnet 130A in the second direction (for example, the Y-axis direction) may be smaller than the length H2 of the coil unit of the first coil 120A in the second direction (H1 < H2). In other embodiments, the length H1 of the first magnet 130A in the second direction (for example, the Y-axis direction) may be the same as or greater than the length H2 of the coil unit of the first coil 120A in the second direction (for example, the Y-axis direction).

[0181] For example, the length L3 of the partition wall 403 of the first magnet 130A in the first direction may be smaller than the length L5 of the hollow 20I of the coil unit of the first coil 120A in the first direction. In other embodiments, the length L3 of the partition wall 403 in the first direction may be the same as or greater than the length L5 of the hollow 20I of the coil unit of the first coil 120A in the first direction.

[0182] For example, the length L3 of the partition 403 in the first direction may be greater than the separation distance d1 between two adjacent coil units. In other embodiments, the length L3 of the partition 403 in the first direction may be equal to or less than the separation distance d1 between two adjacent coil units.

[0183] For example, a first pitch P1 between the first magnet portion 401 and the second magnet portion 402 may be larger than a second pitch P2 between two adjacent coil units (P1>P2). For example, the first pitch P1 may be the distance between the center of the first magnet portion 401 and the center of the second magnet portion 402. Also, the second pitch P2 may be the distance between the center of the hollow 201 of one of the two adjacent coil units and the center of the hollow 201 of the other of the two adjacent coil units. In other embodiments, the first pitch may be the same as or smaller than the second pitch.

[0184] 6a and 6b, for example, sensors 71A and 71B of the first position sensor unit 170A may be disposed in the hollow of the first coil unit 31 and the third coil unit 33 among the three adjacent coil units 31 to 33.

[0185] 6b, a section in which the first magnet 130A and the coil units 31-36 can overlap each other in the second direction (e.g., the Y-axis direction) can be set as the stroke section 801 of the first magnet 130A. When a sensor is disposed within the hollow of the second coil unit 32, if the first magnet 130A is positioned near one side of the stroke section, the sensor will overlap with the partition wall 403 of the first magnet 130A in the second direction (e.g., the Y-axis direction), which may degrade the linearity of the sensor output and thus degrade the position detection performance of the first position sensor. For the same reasons as described above, when the first magnet 130A is positioned near the other side of the stroke section, sensors 71C and 71D may be disposed within the hollows of the fourth coil unit 34 and the sixth coil unit 36 ​​among the multiple coil units 31-36.

[0186] For example, the distance D11 in the first direction between the first sensor 71A and the second sensor 71B may be different from the distance D12 in the first direction between the second sensor 71B and the third sensor 71C.

[0187] For example, D11 may be greater than D12. D11 and D12 may be the separation distance between two sensors or the distance between the centers of two sensors. By making D12 smaller than D11, when first magnet 130A is located near one end of the six-coil unit, second sensor 71B can be located near the center of first magnet portion 401 of first magnet 130A, thereby improving the sensitivity of second sensor 71B and the linearity of the output of second sensor 71B.

[0188] 6a, each of the coil units 31-36 may include a first straight portion 3a, a second straight portion 3b, a first curved portion 3c, and a second curved portion 3d. For example, the first straight portion 3a and the second straight portion 3b may face each other or be located on opposite sides in a first direction (e.g., the Z-axis direction). For example, the first curved portion 3c and the second curved portion 3d may face each other or be located on opposite sides in a third direction (e.g., the X-axis direction).

[0189] For example, the first curved portion 3c can connect one side of the first straight portion 3a to one side of the second straight portion 3b, and the second curved portion 3d can connect the other side of the first straight portion 3a to the other side of the second straight portion 3b.

[0190] 6b, for example, the first sensor 71A may be positioned closer to the second coil unit 32 or to the right of the center or central axis of the hollow 201 of the first coil unit 31. For example, the first sensor 71A may be positioned closer to the first straight portion 3a of the first coil unit 31 than to the second straight portion 3b of the first coil unit 31. For example, the second coil unit 32 may be positioned closer to the first straight portion 3a of the first coil unit 31 than to the second straight portion 3b of the first coil unit 31.

[0191] For example, the second sensor 71B may be disposed biased toward the second coil unit 32 with respect to the center of the hollow 201 of the third coil unit 33. For example, the second sensor 71B may be disposed closer to the second coil unit 32 than to the fourth coil unit 34.

[0192] For example, the second sensor 71B may be located closer to the second straight portion 3b of the third coil unit 33 than to the first straight portion 3a of the third coil unit 33. For example, the second coil unit 32 may be located closer to the second straight portion 3b of the third coil unit 33 than to the first straight portion 3a of the third coil unit 33.

[0193] For example, the third sensor 71C may be arranged biased toward the fifth coil unit 35 with respect to the center of the hollow 201 of the fourth coil unit 34. For example, the third sensor 71C may be arranged closer to the fifth coil unit 35 than to the third coil unit 33.

[0194] For example, the third sensor 71C may be located closer to the first linear portion 3a of the fourth coil unit 34 than to the second linear portion 3b of the fourth coil unit 34. For example, the fifth coil unit 35 may be located closer to the first linear portion 3a of the fourth coil unit 34 than to the second linear portion 3b of the fourth coil unit 34.

[0195] For example, the fourth sensor 71D may be positioned biased toward the fifth coil unit 35 with respect to the center of the hollow 201 of the sixth coil unit 36. For example, the fourth sensor 71D may be positioned closer to the second straight portion 3b of the sixth coil unit 36 ​​than to the first straight portion 3a of the sixth coil unit 36. For example, the fifth coil unit 35 may be positioned closer to the second straight portion 3b of the sixth coil unit 36 ​​than to the first straight portion 3a of the sixth coil unit 36.

[0196] For example, the distance in the first direction between the third sensor 71C and the fourth sensor 71D may be the same as the distance D11 in the first direction between the first sensor 71A and the second sensor 71B.

[0197] In another embodiment, each of the first to fourth sensors 71A to 71D may be disposed in the center or centre of the hollow 201 of the corresponding coil unit among the coil units 31 to .

[0198] Another embodiment of the camera device may include a sensor located within the hollow of each of the six coils.

[0199] 6a and 6b, the sensor is disposed within the hollow of the coil unit, but in other embodiments, the sensor may be disposed outside the hollow of the coil unit. Even if the sensor is disposed outside the hollow of the coil unit, at least a portion of the sensor may overlap with at least a portion of the first magnet 130A in the second direction (e.g., the Y-axis direction) within the stroke section of the first magnet 130A in the first direction.

[0200] Referring to Figures 7 and 8, a first drive signal I1 can be supplied to any one (e.g., 31) of the three adjacent coil units (e.g., 31 to 33) of the first coil 120A, a second drive signal I2 can be supplied to any other one (e.g., 32) of the three adjacent coil units (e.g., 31 to 33) of the first coil 120A, and a third drive signal I3 can be supplied to the remaining one (e.g., 33) of the three adjacent coil units (e.g., 31 to 33) of the first coil 120A.

[0201] The first to third drive signals I1 to I3 may be signals with different phases.

[0202] For example, AC signals having different phases can be supplied to the first to third coil units 31 to 33. For example, AC currents having a phase difference of 120 degrees can be supplied to the first to third coil units 31 to 33.

[0203] The first to third drive signals I1 to I3 may be signals having a predetermined phase difference. For example, the predetermined phase difference may be 120 degrees. For example, the first drive signal may be a U-phase drive current, the second drive signal may be a V-phase drive current, and the third drive signal may be a W-phase drive current.

[0204] For example, three adjacent coil units (e.g., 31 to 33) may be supplied with three-phase drive signals. For example, the drive signals may be AC ​​currents. In other embodiments, the drive signals may be AC ​​voltages. For example, the first to third drive signals may be three-phase sinusoidal signals. For example, the sinusoidal signals may be sine waves or cosine waves.

[0205] In other embodiments, the first to third drive signals may be PWM (Pulse Width Modulation) signals, or, for example, each of the first to third drive signals may be a sinusoidal PWM signal.

[0206] Referring to Figures 6a and 9, for example, the direction of the current of the drive signals I1 to I3 flowing through each of the first to third coil units 31 to 33 may be clockwise (or counterclockwise) in the section having a positive (+) current value, and counterclockwise (or clockwise) in the section having a negative (-) current value.

[0207] In addition, a fourth drive signal I4 can be supplied to any one (e.g., 34) of the remaining three adjacent coil units (e.g., 34 to 36) of the first coil 120A, a fifth drive signal I5 can be supplied to another one (e.g., 35) of the three coil units (e.g., 34 to 36) of the first coil 120A, and a sixth drive signal I6 can be supplied to the remaining one 36 of the three coil units (e.g., 34 to 36) of the first coil 120A.

[0208] The fourth to sixth drive signals I4 to I6 can be supplied with three-phase drive currents, and the above description of the first to third drive signals I1 to I3 can be applied or can be applied by analogy. For example, the fourth drive signal I4 can be the same as the first drive signal I1, the fifth drive signal I5 can be the same as the second drive signal I2, and the sixth drive signal I6 can be the same as the third drive signal I3.

[0209] 9, when three-phase driving currents I1 to I3 as shown in Fig. 9 are supplied to the first to third coil units 31 to 33, a first driving force (or first force) Fz in the first direction and a second driving force (or second force) Fy in the second direction (e.g., the Y-axis direction) can be generated by interaction with the first magnet 130A. Also, a driving force Fx or force in the third direction (e.g., the X-axis direction) may not be generated.

[0210] When three-phase drive currents I1 to I3 are supplied to the first to third coil units 31 to 33, magnetic fields are formed in the coil units 31 to 33, and the first magnet 130A is positioned so that the formed magnetic fields of the coil units 31 to 33 and the first magnet 130A are synchronized. Because the drive currents I1 to I3 are AC signals with different phases, the magnetic fields of the coil units 31 to 33 change. In other words, the position where the magnetic field strength of the coil units 31 to 33 is strongest changes, and the first magnet 130A can move in synchronization with this position change.

[0211] 10, waveform 301 indicates the sum of the intensities of the magnetic fields generated by the first to third coil units 31 to 33 when three-phase driving currents I1 to I3 are supplied to the first to third coil units 31 to 33. Waveform 301 may be the sum of the intensities of the magnetic fields generated by the first to third coil units 31 to 33 corresponding to any one point in the stroke of the first magnet 130A.

[0212] As the current values ​​of the drive currents I1 to I3 change, the waveform 301 also changes. For example, as the current values ​​of the drive currents I1 to I3 change, the waveform 301 can shift in a first direction (306A). Waveform 302 in FIG. 10 represents the strength of the magnetic field of the first magnet 130A, and waveforms 301 and 302 can match or be synchronized with each other. As waveform 301 shifts in the first direction (306A), waveform 302 can shift in the first direction in synchronization with waveform 301 (306B).

[0213] When a line 601 that passes through the centers of the three coil units 31 to 33 and is parallel to the second direction (for example, the Y-axis direction) is aligned with the center of the first magnet 130A, the distance L31 in the first direction between the end 33A1 or 33A2 of the first magnet 130A and the end 33B1 or 33B2 of the three coil units 31 to 33 can be half the length in the first direction of the partition wall 403 of the first magnet 130A. This is to synchronize the waveforms 301 and 302 with each other.

[0214] For example, the centers of the three coil units 31 to 33 may be the center of the hollow 201 of the second coil unit 32 disposed between the first coil unit 31 and the third coil unit 33.

[0215] For example, the center of the first magnet 130A may be the center of the partition wall 403.

[0216] The first magnet 130A can be moved in the first direction by the first driving force Fz, but as shown in Fig. 9, the fluctuation of the first driving force Fz is not large over the entire range (0 to 9 mm) of the stroke section of the first magnet 130A. By synchronizing the waveforms 301 and 302 with each other, it is possible to obtain a uniform first driving force with no large fluctuation in the first driving force Fz.

[0217] Fig. 11 shows the arrangement between two coil units 20A, 20B and magnet 25 according to a comparative example, and Fig. 12 shows the Lorentz force due to the interaction between coil units 20A, 20B and magnet 25 in Fig. 11. Currents (e.g., direct currents) in opposite directions can be supplied to the two coil units 20A, 20B.

[0218] 11(a) may be the case where the center of magnet 25 is located between two coil units 20A and 20B or near the center of two coil units 20A and 20B. That is, FIG. 11(a) may be the case where magnet 25 is located in the middle of the stroke section of magnet 25 (St1 [mm] in FIG. 12).

[0219] 11(b) may be a case where the magnet 25 is located near the end of one of the two coil units 20A and 20B, or a case where the magnet 25 is located at one end of the stroke section of the magnet 25 (Stroke 1 or Stroke 2 in FIG. 12).

[0220] 11(a), the region 501 where the force is actually generated may be a part of the magnet 25 and the first coil unit 20A and a part of the magnet 25 and the second coil unit 20B. In FIG. 11(a), the force generated by the magnet 25 and the first coil unit 20A and the force generated by the magnet 25 and the second coil unit 20B are combined to reinforce each other, so that the driving force can be maximized.

[0221] 11(b), the regions 502 and 503 where force is actually generated may be a portion of the magnet 25 and the second coil unit 20B and another portion of the magnet 25 and the second coil unit 20B. Because the current direction in the portion of the second coil unit 20B and the current direction in the other portion of the second coil unit 20B are opposite to each other, the force generated by the portion 502 of the magnet 25 and the second coil unit 20B and the force generated by the portion 503 of the magnet 25 and the second coil unit 20B are matched to cancel each other out, thereby reducing the driving force.

[0222] 12, there is a large difference between the Lorentz force LF1 when the magnet 25 is located in the middle of the stroke section (St1 [mm]) and the Lorentz force LF2 when the magnet 25 is located at one end of the stroke section (e.g., Stroke 1 or Stroke 2). That is, the force between the magnet 25 and the coil units 20A and 20B is small at one end of the stroke section (e.g., Stroke 1 or Stroke 2), which may reduce the safety and reliability of control over the movement of the moving part in the first direction.

[0223] In this embodiment, the movement of the second lens assembly 622 can be controlled with the same or uniform driving force within the stroke section of the first magnet 130A or the stroke section of the second lens assembly 622.

[0224] 9, in this embodiment, there is a very small deviation between the first driving force Fz generated by the first magnet 130A and the coil units 31 to 33 at the center St2 of the stroke section of the first magnet 130A and the first driving force Fz at both ends of the stroke section (Stroke 11 or Stroke 12). Therefore, in this embodiment, a uniform driving force for moving the second lens assembly 622 in the optical axis direction can be obtained, and the accuracy of the movement control of the second lens assembly 622 in the optical axis direction can be improved.

[0225] As described above with reference to Figures 6 to 9, in this embodiment, due to the size and positional relationship between the first magnet 130A and the three coil units 31 to 33 to which three-phase driving currents I1 to I3 are supplied, it is possible to obtain a uniform first driving force Fz without large fluctuations, thereby improving the accuracy of the zooming operation of the second lens assembly 622.

[0226] In addition, in the embodiment, by arranging the six coil units 31 to 36 sequentially in the first direction, the travel distance that the first magnet 130A can move can be increased, thereby increasing the stroke range of the second lens assembly 622 for zooming operation.

[0227] The description of the first coil 120A and the first magnet 130A can be applied to the second coil 120B and the second magnet 130B or can be applied by analogy. Therefore, in this embodiment, the movement of the third lens assembly 624 can be controlled with the same or uniform driving force within the stroke range of the second magnet 130B or the stroke range of the third lens assembly 624. In this embodiment, there is a very small deviation between the first driving force Fz generated by the second magnet 130B and the coil units 41-43 at the center of the stroke range of the second magnet 130B and the first driving force Fz at both ends of the stroke range. Therefore, in this embodiment, a uniform driving force for moving the third lens assembly 624 in the optical axis direction can be obtained, thereby improving the accuracy of the movement control of the third lens assembly 624 in the optical axis direction.

[0228] When applying the embodiment by analogy with what has been described above in Figures 6 to 9, the size and positional relationship between the second magnet 130B and the three coil units 41 to 43 to which three-phase driving current is supplied makes it possible to obtain a uniform first driving force Fz without large fluctuations, thereby improving the accuracy of the focusing operation of the third lens assembly 624.

[0229] In addition, in the embodiment, by arranging the six coil units 41 to 46 of the second coil 120B sequentially in the first direction, the travel distance that the second magnet 130B can move can be increased, thereby increasing the stroke range of the third lens assembly 624 for focusing operation.

[0230] FIG. 13 is a schematic diagram of a camera device 200 according to an embodiment.

[0231] Referring to FIG. 13, a camera device 200 may include an actuator 100 and an image sensor 810 according to the embodiment.

[0232] The image sensor 810 may receive and sense light passing through the lens unit 620 and convert the sensed light into an electrical signal. For example, the image sensor 810 may include an imaging area for sensing light. Here, the imaging area may be referred to as an effective area, a light-receiving area, or an active area. For example, the imaging area may include a number of pixels on which an image is formed.

[0233] The image sensor 810 may be located behind the third lens assembly 624. For example, the image sensor 810 may be disposed to face the third lens array 59 of the third lens assembly 624 in the first direction.

[0234] The camera device 200 may further include a filter 560 disposed between the image sensor and the lens unit 620 and facing the image sensor in the first direction.

[0235] The filter 560 may serve to block light of a specific frequency band from passing through the lens unit 620 from entering the image sensor 810. For example, the filter 560 may be, but is not limited to, an infrared blocking filter. For example, the filter 560 may be disposed parallel to an xy plane perpendicular to the first direction.

[0236] The camera device 200 may further include a circuit board 800 on which an image sensor 810 is disposed or mounted. The image sensor 810 may be electrically connected to the circuit board 800.

[0237] The camera device 200 may further include an actuator 310 for driving the OIS.

[0238] The actuator 310 may be disposed in front of the actuator 100. The actuator 310 may change the path of light. For example, the actuator 310 may include an optical element that changes the path of light. The optical element may include a reflector that changes the direction of light. For example, the optical element may be a prism that reflects light, but is not limited thereto. In other embodiments, the optical element may be a mirror. The optical element may change the path of incident light to an optical axis parallel to the central axis Z of the lens unit 620, thereby changing the incident light into parallel light. The parallel light may pass through the first lens assembly 640, the second lens assembly 622, and the third lens assembly 624 and reach the image sensor 810.

[0239] For example, the actuator 310 can move an optical member, thereby performing an OIS (Optical Image Stabilizer) operation for image stabilization. For example, the actuator 310 can rotate the optical member about the X axis or about the Y axis, thereby moving the image formed on the image sensor 810 in the X axis or Y axis direction. The actuator 310 can include a coil and a magnet for moving the optical member.

[0240] Furthermore, the camera device 200 according to the embodiment may be included in an optical instrument that forms an image of an object in space using the properties of light, such as reflection, refraction, absorption, interference, and diffraction, and aims to enhance the visual acuity of the eye, record and reproduce an image using a lens, or optically measure, propagate, or transmit an image, etc. For example, the optical instrument according to the embodiment may be a mobile phone, a cellular phone, a smartphone, a portable smart device, a digital camera, a laptop computer, a digital terminal, a PDA (Personal Digital Assistant), a PMP (Portable Multimedia Player), a navigation system, etc., but is not limited thereto, and may be any device for taking videos or photographs.

[0241] FIG. 14 is a perspective view of a terminal 200A according to an embodiment, and FIG. 15 is a configuration diagram of the terminal 200A shown in FIG.

[0242] Referring to Figures 14 and 15, the terminal 200A (hereinafter referred to as a portable "terminal") may include a body 850, a wireless communication unit 710, an A / V input unit 720, a sensing unit 740, an input / output unit 750, a memory unit 760, an interface unit 770, a control unit 780, and a power supply unit 790.

[0243] The body 850 shown in FIG. 14 has a bar shape, but is not limited thereto, and may have various structures such as a slide type, folder type, swing type, swivel type, etc., in which two or more sub-bodies are connected to be able to move relative to each other.

[0244] The body 850 may include a case (such as a casing, housing, or cover) that forms the exterior. For example, the body 850 may be divided into a front case 851 and a rear case 852. Various electronic components of the terminal may be housed in a space formed between the front case 851 and the rear case 852.

[0245] The wireless communication unit 710 may include one or more modules that enable wireless communication between the terminal 200A and a wireless communication system or between the terminal 200A and a network in which the terminal 200A is located. For example, the wireless communication unit 710 may include a broadcast receiving module 711, a mobile communication module 712, a wireless Internet module 713, a short-range communication module 714, and a location information module 715.

[0246] The A / v (Audio / video) input unit 720 is for inputting an audio signal or a video signal, and may include a camera 721, a microphone 722, and the like.

[0247] The camera 721 may include the camera device 200 according to an embodiment.

[0248] The sensing unit 740 can sense the current state of the terminal 200A, such as the open / closed state of the terminal 200A, the position of the terminal 200A, whether or not the user is touching the terminal 200A, the orientation of the terminal 200A, and the acceleration / deceleration of the terminal 200A, and can generate a sensing signal for controlling the operation of the terminal 200A. For example, if the terminal 200A is a slide phone, the sensing unit 740 can sense the open / closed state of the slide phone. The sensing unit 740 is also responsible for sensing functions related to the power supply state of the power supply unit 790, the connection state of the interface unit 770 with an external device, etc.

[0249] The input / output unit 750 generates input or output related to vision, hearing, touch, etc. The input / output unit 750 can generate input data for operational control of the terminal 200A and can display information processed by the terminal 200A.

[0250] The input / output unit 750 may include a keypad unit 730, a display module 751, an audio output module 752, and a touch screen panel 753. The keypad unit 730 may generate input data through input from the keypad.

[0251] The display module 751 may include a plurality of pixels that change color in response to an electrical signal. For example, the display module 751 may include at least one of a liquid crystal display, a thin film transistor-liquid crystal display, an organic light-emitting diode, a flexible display, and a 3D display.

[0252] The audio output module 752 can output audio data received from the wireless communication unit 710 in a call signal reception mode, a call mode, a recording mode, a voice recognition mode, or a broadcast reception mode, or can output audio data stored in the memory unit 760.

[0253] The touchscreen panel 753 can convert changes in capacitance caused by a user's touch on a particular area of ​​the touchscreen into electrical input signals.

[0254] The memory unit 760 can store programs for processing and controlling the control unit 780 and temporarily store input and output data (e.g., phonebook, messages, audio, still images, photos, videos, etc.) For example, the memory unit 760 can store images, such as photos or videos, captured by the camera 721.

[0255] The interface unit 770 serves as a passageway for connection with an external device connected to the terminal 200A. The interface unit 770 receives data or power from an external device and transmits it to each component inside the terminal 200A, or transmits data inside the terminal 200A to an external device. For example, the interface unit 770 may include a wired / wireless headset port, an external charger port, a wired / wireless data port, a memory card port, a port for connecting a device equipped with an identification module, an audio I / O (Input / Output) port, a video I / O (Input / Output) port, an earphone port, etc.

[0256] The controller 780 may control the overall operation of the terminal 200 A. For example, the controller 780 may perform related control and processing for voice communication, data communication, video communication, and the like.

[0257] The control unit 780 may include a multimedia module 781 for playing multimedia. The multimedia module 781 may be implemented within the control unit 180 or may be implemented separately from the control unit 780.

[0258] The control unit 780 can perform pattern recognition processing to recognize handwritten or drawn inputs made on the touch screen as characters and images, respectively.

[0259] The power supply unit 790 receives an external power source or an internal power source under the control of the control unit 780, and can supply power necessary for the operation of each component.

[0260] The features, structures, effects, etc. described in the above embodiments are included in at least one embodiment of the present invention and are not necessarily limited to one embodiment. Furthermore, the features, structures, effects, etc. exemplified in each embodiment can be combined or modified in other embodiments by a person skilled in the art to which the embodiment belongs. Therefore, content related to such combinations and modifications should be interpreted as being included in the scope of the present invention. [Industrial Applicability]

[0261] The embodiment can be used in an actuator and a camera device that can ensure a uniform and stable driving force for movement of the moving part in the optical axis direction and can increase the scroll range of the moving part.

Claims

1. Lens barrel and A magnet is placed in the lens barrel, The coil includes, which moves the lens barrel in a first direction through interaction with the magnet, The coil includes a first coil unit, a second coil unit, and a third coil unit arranged in the first direction. The magnet is superimposed on the first to third coil units in a second direction perpendicular to the first direction, The length of the magnet in the first direction is less than the sum of the lengths of the first to third coil units in the first direction. The magnet includes a first magnet section, a second magnet section, and a partition wall disposed between the first magnet section and the second magnet section. Each of the first to third coil units has a ring shape including a hollow formed inside, An actuator comprising a first sensor disposed within the hollow of the first coil unit and a second sensor disposed within the hollow of the third coil unit, wherein no sensor is disposed within the hollow of the second coil unit.

2. The actuator according to claim 1, wherein the length of the magnet in the first direction is greater than the sum of the lengths of two of the first to third coil units in the first direction.

3. The actuator according to claim 1, wherein each of the first to third coil units is supplied with signals having different phases from each other.

4. The actuator according to claim 1, wherein each of the first to third coil units is supplied with AC signals having different phases from each other.

5. The actuator according to claim 1, wherein each of the first to third coil units is supplied with a signal having a phase difference of 120 degrees.

6. The actuator according to claim 1, wherein each of the first to third coil units is supplied with an alternating current having a phase difference of 120 degrees.

7. The actuator according to claim 1, wherein the first magnet portion includes an N pole and a S pole facing the second direction, and the second magnet portion includes an S pole and an N pole facing the second direction.

8. The length of the first magnet portion in the first direction is greater than the lengths of the first to third coil units in the first direction. The actuator according to claim 7, wherein the length of the second magnet portion in the first direction is greater than the lengths of the first to third coil units in the first direction.

9. The actuator according to claim 7, wherein the length of the first magnet portion in the first direction is greater than the length of the first coil unit in the first direction.

10. The actuator according to claim 7, wherein the length of the second magnet portion in the first direction is greater than the length of the first coil unit in the first direction.

11. The actuator according to claim 7, wherein the length of the partition wall in the first direction is greater than the length of the hollow in the first direction.

12. The actuator according to claim 7, wherein the first coil unit has a ring shape including a hollow, and the length of the partition wall in the first direction is greater than the length of the hollow of the first coil unit in the first direction.

13. The actuator according to claim 7, wherein the first pitch between the first magnet portion and the second magnet portion is greater than the second pitch between two adjacent coil units among the first to third coil units, the first pitch is the distance between the center of the first magnet portion and the center of the second magnet portion, and the second pitch is the distance between the hollow center of one of the two adjacent coil units and the hollow center of the other.

14. The actuator according to claim 7, wherein the length of the magnet in the third direction is less than the length of the magnet in the first direction, and the third direction is perpendicular to the first and second directions, respectively.

15. The actuator according to claim 14, wherein the length of the magnet in the third direction is smaller than the respective lengths of the first to third coil units in the third direction.

Images