Magnet assembly and manufacturing method therefor

Abstract

The present invention relates to a magnet assembly and a manufacturing method therefor. A magnet assembly according to the present invention comprises: a magnet unit in which three magnets are formed in a Halbach array; and a yoke in contact with the lower surface and at least a part of the left and right surfaces of the magnet unit. The left and right surfaces of the magnet unit may be attached with a double-sided tape, and the lower surface may be fixed with an adhesive.

Description

Magnet assembly and method of manufacturing the same

[0001] The present invention relates to a magnet assembly and a method for manufacturing the same.

[0002] When using multiple magnets, the strength of the magnetic field varies depending on the arrangement of the magnets.

[0003] Figure 1 is a drawing showing a magnet section arranged in a Halbach array.

[0004] Referring to FIG. 1, a plurality of magnets (1401, 1402, 1403) are arranged with magnetic fluxes in different directions to form a magnet section (1400) arranged in a Halbach array.

[0005] A Halbach arrangement is a plurality of magnets (1401, 1402, 1403) arranged in a horizontal direction so as to be in contact with each other, but arranged by rotating the magnets (1401, 1402, 1403) along the horizontal direction in a counterclockwise (or clockwise) direction. At this time, the upper surface of each magnet (1401, 1402, 1403) is arranged so that its polarity (N, S) is the same as the upper surface of any one of the magnets (1401, 1402, 1403) adjacent in the horizontal direction.

[0006] A magnet section (1400) in which multiple magnets are arranged in a Halbach array as in (a) of Fig. 1 exhibits a magnetic flux distribution as in (b).

[0007] In this way, the magnet section (1400) arranged in a Halbach array has a larger magnetic field at the top and a smaller magnetic field at the bottom compared to when arranged in the same direction. As the magnetic field at the bottom decreases, the magnetic field at the top increases. Theoretically, the magnetic field at the top can increase by up to twice. In this way, the magnet section arranged in a Halbach array can arrange multiple magnets in a specific direction to concentrate the magnetic force in the direction where magnetic force is needed and reduce the magnetic force in the direction where magnetic force is not needed. However, when magnets are joined, the magnetization directions are different, so a repulsive force is generated, causing them to be pushed upward in the vertical direction.

[0008] Although magnets arranged in a Halbach array can dramatically improve magnetic performance, there is a problem with low productivity and high manufacturing costs.

[0009] It is necessary to develop technology that can improve these problems and increase the productivity of magnet assemblies.

[0010] The technical problem that the present invention aims to solve is to provide a new manufacturing method that enables easy assembly of a magnet assembly such that a yoke and a plurality of magnets coupled to the yoke satisfy a Halbach arrangement, and to provide a magnet assembly with increased productivity using this method. Furthermore, the invention provides a camera actuator capable of moving a lens module with a strong driving force using such a magnet assembly.

[0011] The technical problems of the present invention are not limited to those mentioned above, and other unmentioned technical problems will be clearly understood by those skilled in the art from the description below.

[0012] The magnet assembly of the present invention for solving the above technical problem comprises a magnet portion in which three magnets are formed in a Halbach arrangement, and a yoke that contacts at least a portion of the lower surface, left side, and right side of the magnet portion, wherein the left side and right side of the magnet portion are attached with double-sided tape and the lower surface can be fixed with an adhesive.

[0013] In some embodiments of the present invention, one or more of the magnets may be characterized by having polarity divided diagonally.

[0014] In some embodiments of the present invention, the yoke may include a flat plate in contact with the lower surface of the magnet part and a side reinforcing part in contact with the side of the magnet part, and the upper end of the reinforcing part may be characterized by being aligned with the upper surface of the magnet part.

[0015] In some embodiments of the present invention, the area of ​​the side reinforcement may be 45% or more of the area of ​​the side of the magnet part.

[0016] In some embodiments of the present invention, the yoke may further include additional reinforcing members that contact the front and back surfaces of the magnet part.

[0017] In some embodiments of the present invention, the adhesive area of ​​the double-sided tape may be 85% or more of the area of ​​the side reinforcement.

[0018] In some embodiments of the present invention, the width of the adhesive area of ​​the double-sided tape may be equal to the width of the side reinforcement.

[0019] In some embodiments of the present invention, the amount of adhesive applied can cover 70 to 90% of the area of ​​the lower surface of the magnet part with a thickness of 8 to 10 μm.

[0020] The method for manufacturing a magnet assembly according to the present invention for solving the above technical problem may include the step of attaching double-sided tape of a predetermined size to a side reinforcement portion of a yoke (S10), the step of applying a certain amount of adhesive to a flat plate of the yoke (S20), the step of attaching left and right magnets (S30), and the step of attaching a center magnet (S40).

[0021] The actuator for a camera according to the present invention for solving the above technical problem may include the magnet assembly or be assembled by the above manufacturing method.

[0022] According to the magnet assembly and the method for manufacturing the same of the present invention, by enabling a plurality of magnets to be easily attached to the yoke of the magnet assembly in a Halbach arrangement, the productivity of the assembly process of the magnet assembly arranged in the yoke and the Halbach arrangement can be increased. Accordingly, the competitiveness of the magnet assembly can be enhanced by strengthening the magnetic force in the required direction and reducing the magnetic force in the unnecessary direction. In addition, a camera actuator employing the same can drive the lens module of a camera with a stronger driving force using the same driving current.

[0023] Figure 1 is a drawing showing a magnet section arranged in a Halbach array.

[0024] FIG. 2 is a cross-sectional view of a magnet assembly according to one embodiment of the present invention.

[0025] FIG. 3 is a perspective view of a magnet assembly according to one embodiment of the present invention.

[0026] FIG. 4 is an exploded perspective view of a magnet assembly according to one embodiment of the present invention.

[0027] Figure 5 is an enlarged view of part A of Figure 4.

[0028] FIG. 6 is a drawing showing a method for manufacturing a magnet assembly according to one embodiment of the present invention.

[0029] FIG. 7 is a perspective view of a camera actuator according to one embodiment of the present invention.

[0030] Figure 8 is a cross-sectional view cut along BB' in Figure 7.

[0031] FIG. 9 is a perspective view showing the driving-related parts of the actuator according to FIG. 7.

[0032] The advantages and features of the present invention and the methods for achieving them will become clear by referring to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below but may be implemented in various different forms. These embodiments are provided merely to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention, and the present invention is defined only by the scope of the claims. Throughout the specification, the same reference numerals refer to the same components.

[0033] "And / or" includes each of the mentioned items and all combinations of one or more.

[0034] The terms used herein are for describing embodiments and are not intended to limit the invention. In this specification, the singular form includes the plural form unless specifically stated otherwise in the text. As used herein, "comprising" and / or "comprising" does not exclude the presence or addition of one or more other components, steps, actions, and / or elements to the mentioned components, steps, actions, and / or elements.

[0035] Furthermore, throughout the specification, when a part is described as being "connected" to another part, this includes not only cases where they are "directly connected," but also cases where they are "indirectly" or "electrically connected" with other members or elements interposed between them.

[0036] Additionally, throughout the specification, the description that each layer (film), region, pattern, or structure is formed "on" or "under" the substrate, each layer (film), region, pad, or pattern includes both direct formation and formation through another layer. The criteria for "on" or "under" each layer are described based on the drawings.

[0037] Furthermore, expressions such as 'first, second,' etc., are used solely to distinguish multiple compositions and do not limit the order or other characteristics between the compositions.

[0038] Unless otherwise defined, all terms used in this specification (including technical and scientific terms) may be used in a meaning commonly understood by those skilled in the art to which the present invention pertains. Additionally, terms defined in commonly used dictionaries are not to be interpreted ideally or excessively unless explicitly and specifically defined otherwise.

[0039] In FIGS. 2 to 5, the positive direction of the Z-axis is set to upward and the negative direction to downward, the positive direction of the X-axis to the right and the negative direction to the left, and the negative direction of the Y-axis to the front and the positive direction to the rear.

[0040] FIG. 2 is a cross-sectional view of a magnet assembly according to one embodiment of the present invention, FIG. 3 is a perspective view, FIG. 4 is an exploded perspective view, and FIG. 5 is an enlarged view of part A of FIG. 4.

[0041] Referring to FIGS. 2 to 5, the magnet assembly (100) comprises a magnet part (1400) formed with three magnets (1401, 1402, 1403) arranged in a Halbach array, and a yoke (1800) that contacts at least a portion of the lower surface, left side, and right side of the magnet part (1400). The left and right sides of the magnet part (1400) may be attached with double-sided adhesive tape (Tp), and the lower surface may be fixed with adhesive (Ad).

[0042] Referring to FIG. 2, a plurality of magnets (1401, 1402, 1403) may be arranged in a first direction (e.g., the x-axis of FIG. 2) so as to be in contact with each other, and the magnets (1401, 1402, 1403) may be rotated counterclockwise (or clockwise) along the first direction to form a Halbach arrangement. Additionally, the upper surface of each magnet (1401, 1402, 1403) may be arranged such that the polarity (N, S) is the same as the upper surface of any one of the magnets (1401, 1402, 1403) adjacent in the first direction. And each bottom surface of the magnet (1401, 1402, 1403) is characterized by having polarities (N, S) arranged differently from the bottom surface of the adjacent magnet (1401, 1402, 1403) in the first direction. In this case, if the top surface or bottom surface includes two polarities, the top surface or bottom surface may refer to a portion of the area that contacts another magnet in the first direction.

[0043] According to the embodiment, the second magnet (1402) has an N pole located on its upper surface, and the area of ​​the upper surface of the first magnet (1401) adjacent to one side of the second magnet (1402) that contacts the upper surface of the second magnet (1402) has an N pole located in the same manner. At the same time, the area of ​​the upper surface of the third magnet (1403) adjacent to the other side of the second magnet (1402) that contacts the upper surface of the second magnet (1402) has an N pole located in the same manner. Therefore, the first to third magnets (1401, 1402, 1403) can be formed in a shape in which N poles are gathered on their upper surfaces and arranged in a Halbach arrangement.

[0044] In the case of FIG. 2(a), the first magnet (1401) is magnetized in the direction of the -x axis, the second magnet (1402) in the direction of the -z axis (rotated 90 degrees from the direction of the first magnet (1401)), and the third magnet (1403) in the direction of the +x axis (rotated 90 degrees from the direction of the second magnet (1402)), so that the first to third magnets (1401, 1402, 1403) can be arranged in a Halbach arrangement in which polarity is divided in the horizontal or vertical direction.

[0045] In the case of FIG. 2(b), the first magnet (1401) is magnetized in a direction that divides the -x-axis and +z-axis in half at 45 degrees, the second magnet (1402) is magnetized in a direction that divides the +z-axis and +z-axis in half at 45 degrees, and the third magnet (1403) is magnetized in a direction that divides the +x-axis and +z-axis in half at 45 degrees, so that the first magnet (1401) and the third magnet (1403) can be arranged in a Halbach arrangement in which polarity is divided diagonally.

[0046] In the case of a magnet section (1400) including magnets (1401, 1403) in which polarity is divided diagonally in this way, the maximum amplification of magnetic flux density is lowered in the direction where the same polarity converges, and instead, the difference between the maximum amplification and the minimum amplification is reduced, so that a flat amplification can be achieved. Such a flat amplification is advantageous for driving with a constant thrust during the operating range when applied to a driving part such as an electronic device.

[0047] The magnet section arranged in a Halbach array can concentrate magnetic force in the direction where it is needed and reduce magnetic force in the direction where it is not needed by arranging multiple magnets in a specific direction.

[0048] Referring to FIGS. 3 and 4, the yoke (1800) may include a flat plate (1801) that contacts the lower surface of the magnet part (1400) and side reinforcing parts (1803) that contact the left and right sides of the magnet part (1400).

[0049] The side reinforcement (1803) can be formed by wrapping the left and right sides of the magnet part (1400) in the longitudinal direction (X-axis direction) and bending upward (Z-axis direction), and the height of the side reinforcement (1803) can be formed to be equal to the height of the magnet part (1400).

[0050] Additionally, the yoke (1800) may further include additional reinforcing members (1805) that contact the front and back surfaces.

[0051] The additional reinforcing member (1805) can be formed by wrapping the front and back sides of the magnet part (1400) in the width direction (Y-axis direction) and bending upward (Z-axis direction), and the height of the additional reinforcing member (1805) can be formed to be equal to the height of the magnet part (1400).

[0052] Therefore, the yoke (1800) may be a hollow cuboid shape that opens the upper part of the magnet part (1400) and contacts the remaining five sides. Thus, the magnets (1401, 1402, 1403) inserted into the yoke (1800) can be restrained from being pushed out in all directions except the upward direction.

[0053] The yoke (1800) can shield by amplifying the magnetic flux density in the direction toward the open side and reducing the magnetic flux density in the direction toward the contact side.

[0054] When a yoke (1800) formed of a magnetic material is brought into contact with the magnet part (1400), the yoke (1800) absorbs magnetic field lines, thereby shielding the magnetic force in the direction to which the yoke (1800) is attached and amplifying the magnetic force in the direction not to which the yoke (1800) is attached. Accordingly, the magnetic flux density in the direction not to which the yoke (1800) is attached increases, and the magnetic flux density in the direction to which the yoke (1800) is attached decreases.

[0055] In this way, the magnet assembly (100) according to the embodiment can concentrate magnetic force in the direction where magnetic force is needed and double the effect of reducing magnetic force in the direction where magnetic force is not needed by forming a yoke (1800) in accordance with the Halbach arrangement.

[0056] Referring to FIG. 4, the left side of the first magnet (1401) and the right side of the third magnet (1403) can be attached to the inner surface of the left side reinforcement (1803) and the inner surface of the right side reinforcement (1803) of the yoke (1800), respectively, with double-sided tape (Tp).

[0057] When the first magnet (1401) and the third magnet (1403) are attached with double-sided tape (Tp), it is possible to prevent the magnets (1401, 1402, 1403) from being separated due to repulsion when the second magnet (1402) is inserted. However, if the magnets (1401, 1402, 1403) are to be attached to the flat plate (1801) of the yoke (1800) with adhesive (Ad) without the fixation of double-sided tape (Tp), the first magnet (1401) and the second magnet (1402) must be attached to the flat plate (1801) first, and the third magnet (1403) must be fixed after waiting for the adhesive (Ad) to cure, which takes a long time in the manufacturing process.

[0058] The adhesive force of the double-sided tape (Tp) must be greater than the repulsive force between the magnets (1401, 1402, 1403) to prevent pushing up caused by the repulsive force between the magnets. The length of each side of the magnets (1401, 1402, 1403) according to the embodiment is about 1 to 3 mm, and in this case, an adhesive force of the double-sided tape (Tp) of about 2 gf or more is required.

[0059] Therefore, the area of ​​the side reinforcement part (1803) must be at least 45% of the side area of ​​the magnet part (1400), and the adhesive area of ​​the double-sided tape (Tp) must be at least 85% of the area of ​​the side reinforcement part (1803) to secure the adhesive strength.

[0060] In the example, the side length (y3) of the magnet part (1400) is 2.2 mm and the vertical length (z2) is 0.8 mm, so the area is 1.76 mm². The side length (y2) of the reinforcing part (1803) of the yoke (1800) is 1.25 mm and the vertical length (z2) is 0.8 mm, so the area is 0.84 mm². Therefore, the area of ​​the reinforcing part satisfies the above condition as 48% of the side area of ​​the magnet part (1400).

[0061] The area of ​​the side reinforcement (1803) of the yoke (1800) is 0.84 mm², and the horizontal length (y1) of the adhesive area of ​​the double-sided tape (Tp) is 1.25 mm, and the vertical length (z1) is 0.6 mm, so the area is 0.756 mm². Therefore, the adhesive area of ​​the double-sided tape (Tp) satisfies the above condition as 88% of the area of ​​the side reinforcement (1803) of the yoke (1800).

[0062] At this time, it is preferable to set the horizontal length (y1) of the adhesive area of ​​the double-sided tape (Tp) to be equal to the horizontal length (y2) of the side reinforcement part (1803) of the yoke (1800). This is because it improves the adhesive strength and simultaneously enables the ends of both sides to be aligned during the adhesive process.

[0063] Before attaching the first magnet (1401) and the second magnet (1402) to the side of the yoke (1800) with double-sided tape (Tp), adhesive (Ad) can be applied to the flat plate (1801) of the yoke (1800) to attach the magnets (1401, 1402, 1403) to the flat plate (1801) of the yoke (1800). After applying the adhesive (Ad) to the flat plate (1801) of the yoke (1800), the first magnet (1401) and the second magnet (1402) can be attached to the flat plate (1801) first, and the third magnet (1403) can be attached immediately without waiting for the curing time.

[0064] Finally, the adhesive (Ad) can be cured to permanently fix each magnet (1401, 1402, 1403) to the yoke (1800).

[0065] To apply adhesive (Ad) to the flat plate (1801) of the yoke (1800), an injection device for applying adhesive (Ad) can be used.

[0066] In the adhesive application process, a predetermined amount of adhesive (Ad) can be injected into the flat plate (1801) of the yoke (1800) through an injection device.

[0067] Since the adhesive (Ad) is applied in an amount that can cover at least 70% of the minimum plate (1801) area without overflowing, a corresponding amount can be supplied using a device such as an injection needle (not shown).

[0068] The amount of adhesive (Ad) added can be determined to cover 70 to 90% of the surface area of ​​the lower surface of the magnet (1401, 1402, 1403) with a thickness of 8 to 10 μm. This is because it is possible to maximize adhesive strength with an appropriate thickness and area while simultaneously preventing the adhesive (Ad) from overflowing to the outside of the assembly.

[0069] Accordingly, in the magnet assembly (100) according to the present invention, an adhesive (Ad) layer covering 70 to 90% of the area with a thickness of 8 to 10 μm can be disposed between the lower surface of the magnet (1401, 1402, 1403) and the flat plate (1801) of the yoke (1800).

[0070] The adhesive (Ad) used in the present invention is not particularly limited as long as it can secure the adhesive strength of the finished assembly.

[0071] However, to reduce the processing time required for the curing process, it is desirable that the curing be completed to a level of 70% or more within 20 minutes and that the liquid flow be controlled due to viscosity. For example, 3M’s DP420 Epoxy Adhesive can be used.

[0072] FIG. 5 is a drawing showing a method for manufacturing a magnet assembly according to one embodiment of the present invention.

[0073] Referring to FIG. 6, the method for manufacturing a magnet assembly according to the present invention may include the step (S10) of attaching double-sided tape of a predetermined size to a side reinforcing portion (1803) of a yoke (1800), the step (S20) of applying a certain amount of adhesive to a flat plate (1801) of the yoke (1800), the step (S30) of attaching left and right magnets, and the step (S40) of attaching a center magnet.

[0074] Referring to FIG. 6(a), a double-sided tape (Tp) of a predetermined size can be attached to the inner surface of the side reinforcement (1803) of the yoke (1800). At this time, the predetermined size secures at least 85% of the area of ​​the side reinforcement (1803).

[0075] Referring to FIG. 6(b), a certain amount of adhesive (Ad) can be applied to the flat plate (1801) of the yoke (1800). At this time, the amount of adhesive (Ad) can be determined to be an amount that can cover 70 to 90% of the surface area of ​​the lower surface of the magnets (1401, 1402, 1403) with a thickness of 8 to 10 μm.

[0076] Referring to Fig. 6 (c), the first magnet (1401) and the third magnet (1403) can be attached.

[0077] Referring to (d) of Fig. 6, a second magnet (1402) can be attached.

[0078] Finally, the adhesive (Ad) can be cured to permanently fix each magnet (1401, 1402, 1403) to the yoke (1800).

[0079] In this way, by making it easy to arrange and attach magnets in a Halbach arrangement on the yoke, the magnet attachment process can be easily carried out, thereby increasing the productivity of the magnet assembly process.

[0080] Next, an embodiment of a camera actuator to which a magnet assembly according to the present invention is applied will be described with reference to the drawings.

[0081] FIG. 7 is a perspective view of a camera actuator according to one embodiment of the present invention, FIG. 8 is a cross-sectional view cut along BB' in FIG. 7, and FIG. 9 is a perspective view showing a driving-related component of the actuator according to FIG. 7.

[0082] In FIGS. 7 to 9, the first direction is the X-axis direction in the drawing, and the second direction is the Y-axis direction in the drawing. The second direction is perpendicular to the first direction. Also, the third direction is the Z-axis direction in the drawing. It is a direction perpendicular to both the first direction and the second direction. Here, the third direction (Z-axis direction) corresponds to the direction of the optical axis, and the first direction (X-axis direction) and the second direction (Y-axis direction) are directions perpendicular to the optical axis. Additionally, in the description of the camera actuator (1000) below, the optical axis direction corresponds to the optical path and is the third direction (Z-axis direction).

[0083] Referring to FIGS. 7 to 9, the actuator for a camera according to the present invention comprises a housing (1100), a first lens assembly (1200) and a second lens assembly (1300) that move along the optical axis direction within the housing (1100), a first magnet assembly (100a) and a second magnet assembly (100b) disposed on the first lens assembly (1200) and the second lens assembly (1300), and a coil portion (1700) that drives the magnet assembly (100). The magnet assembly (100) may include a magnet portion (1400) formed by arranging a plurality of magnets in a Halbach arrangement, and a yoke (1800) that contacts the lower surface and side of the magnet portion (1400).

[0084] A first magnet assembly (100a) disposed on the first lens assembly (1200) may be formed by combining a first magnet part (1410) and a first yoke (1810), and a second magnet assembly (100b) disposed on the second lens assembly (1300) may be formed by combining a second magnet part (1420) and a second yoke (1820).

[0085] A camera actuator (1000) according to an embodiment may include a housing (1100), a first lens assembly (1200), a second lens assembly (1300), a magnet part (1400), a substrate (1500), a housing cover (1600), a coil part (1700), a yoke (1800), and a stopper part (S).

[0086] The housing (1100) may form the outer wall of the camera actuator (1000). A housing cover (1600) may be placed on one side of the housing (1100). Inside the housing (1100), a first lens assembly (1200), a second lens assembly (1300), a magnet part (1400), a coil part (1700), a yoke (1800), and a stopper part (S) may be included.

[0087] A magnet portion (1400), a coil portion (1700), and a yoke (1800) may be disposed on a side parallel to the optical axis direction of the housing (1100). A surface perpendicular to the optical axis direction of the housing (1100) may include an opening. A substrate (1500) may be disposed on the outside of the housing (1100).

[0088] A camera actuator (1000) according to an embodiment may include a first lens assembly (1200) and a second lens assembly (1300).

[0089] The first lens assembly (1200) and the second lens assembly (1300) may be moving lenses that move through a coil, a magnet, and a guide pin.

[0090] The second lens assembly (1300) can perform the function of a variantr that re-forms the image formed by focusing light into another location. Meanwhile, the distance to the subject or the image distance may change significantly in the second lens assembly (1300), resulting in a large change in magnification, and the second lens assembly (1300), as a variantr, can play an important role in the change in focal length or magnification of the optical system.

[0091] Meanwhile, the image formed by the second lens assembly (1300), which is a variable, may differ slightly depending on the position. Accordingly, the first lens assembly (1200) can perform a position compensation function for the image formed by the variable. For example, the first lens assembly (1200) can perform a compensator function that accurately forms the image formed by the second lens assembly (1300), which is a variable, at the actual image sensor position. For example, the first lens assembly (1200) and the second lens assembly (1300) can be driven by electromagnetic force resulting from the interaction between a coil and a magnet.

[0092] The first lens assembly (1200) and the second lens assembly (1300) can be placed inside the housing (1100).

[0093] The first lens assembly (1200) and the second lens assembly (1300) can move along the optical axis direction inside the housing (1100) by means of the magnet part (1400), the yoke (1800), and the coil part (1700).

[0094] The first lens assembly (1200) and the second lens assembly (1300) may be spaced apart from each other along the optical axis direction. The first lens assembly (1200) and the second lens assembly (1300) may partially overlap with the stopper portion (S) in the optical axis direction. The first lens assembly (1200) and the second lens assembly (1300) may partially overlap with the housing cover (1600) in the optical axis direction.

[0095] The first lens assembly (1200) can be driven by a first magnet assembly (100a) in which a first magnet part (1410) and a first yoke (1810) are combined. The first lens assembly (1200) can be coupled to the first yoke (1810). The first lens assembly (1200) is coupled to the first yoke (1810), and the first magnet part (1410) is coupled to the first yoke (1810), so that the first magnet part (1410) can be fixed to the first lens assembly (1200). The first lens assembly (1200) can be superimposed with the coil part (1700) in a first direction perpendicular to the optical axis direction. The first lens assembly (1200) can be overlapped in the optical axis direction with the first stopper (S1), the third stopper (S3), and the fifth stopper (S5).

[0096] The second lens assembly (1300) can be driven by a second magnet assembly (100b) in which the second magnet part (1420) and the second yoke (1820) are combined. The second lens assembly (1300) can be coupled with the second yoke (1820). The second lens assembly (1300) is coupled with the second yoke (1820), and the second magnet part (1420) is coupled to the second yoke (1820), so that the second magnet part (1420) can be fixed to the second lens assembly (1300). The second lens assembly (1300) can be overlapped with the coil part (1700) in a first direction perpendicular to the optical axis direction. The second lens assembly (1300) can be overlapped with the second stopper (S2) and the fourth stopper (S4) in the optical axis direction.

[0097] The camera actuator (1000) according to the embodiment may include a substrate (1500).

[0098] A substrate (1500) may be placed in a housing (1100). A substrate (1500) may be placed on the outside of the housing (1100). A driver IC (not shown) and a coil section (1700) may be placed on the substrate (1500). A driver IC and a coil section (1700) may be placed on the inside of the substrate (1500). The substrate (1500) may fix the driver IC and the coil section (1700). The substrate (1500) may transmit information of an optical signal from the driver IC to the coil section (1700).

[0099] The substrate (1500) may include a first sub-substrate (1510), a second sub-substrate (1520), and a third sub-substrate (1530).

[0100] A first sub-substrate (1510) may be placed on the side of the housing (1100). The first sub-substrate (1510) may be placed in the optical axis direction and a second direction. A second sub-substrate (1520) may be placed on the upper surface of the housing. The second sub-substrate (1520) may be placed in the optical axis direction and a first direction. A third sub-substrate (1530) may be placed on the side of the housing (1100). The third sub-substrate (1530) may be placed in the optical axis direction and a second direction. The first sub-substrate (1510) and the third sub-substrate (1530) may be placed parallel to each other. The first sub-substrate (1510) and the third sub-substrate (1530) may be placed perpendicular to the second sub-substrate (1520). A coil portion (1700) may be placed on the first sub-substrate (1510) and the third sub-substrate (1530).

[0101] The camera actuator (1000) according to the embodiment may include a housing cover (1600).

[0102] The housing cover (1600) may be fixedly positioned on one side of the housing (1100). The housing cover (1600) may overlap with the housing (1100) in the direction of the optical axis. A first stopper part (Sa) may be positioned on the housing cover (1600).

[0103] The housing cover (1600) may partially overlap with the first lens assembly (1200) and the second lens assembly (1300) in the direction of the optical axis.

[0104] The camera actuator (1000) according to the embodiment may include a stopper part (S).

[0105] The stopper part (S) may be disposed inside the housing (1100). The stopper part (S) may be disposed inside the housing (1100) to prevent the first lens assembly (1200) and the second lens assembly (1300) from colliding inside the housing (1100). The stopper part (S) may absorb impact by contacting the first lens assembly (1200) and the second lens assembly (1300). The stopper part (S) may include a Poron. The shape of the stopper part (S) is not limited. For example, the stopper part (S) may include a rectangular shape.

[0106] The stopper portion (S) may include a first stopper portion (Sa) and a second stopper portion (Sb). The first stopper portion (Sa) may be disposed on the housing cover (1600). The first stopper portion (Sa) may be disposed on one side of the housing cover (1600) facing the interior of the housing (1100). The first stopper portion (Sa) may be disposed on the housing cover (1600) so as to overlap with the first lens assembly (1200) or the second lens assembly (1300). The second stopper portion (Sb) may be disposed on one side of the interior of the housing (1100). The second stopper portion (Sb) may be disposed on one side of the interior of the housing (1100) so as to overlap with the first lens assembly (1200) or the second lens assembly (1300) in the direction of the optical axis. The first stopper part and the second stopper part may be spaced apart from each other in opposite directions in the optical axis direction with respect to the first lens assembly (1200) and the second lens assembly (1300).

[0107] The first stopper part (Sa) may include a first stopper (S1) and a second stopper (S2). The first stopper (S1) and the second stopper (S2) may be spaced apart from each other in a first direction.

[0108] The first stopper (S1) can overlap with the first lens assembly (1200) in the direction of the optical axis.

[0109] The second stopper (S2) can overlap with the second lens assembly (1300) in the direction of the optical axis.

[0110] The first stopper (S1) can come into contact with the bottom of the first lens assembly (1200).

[0111] The second stopper (S2) can come into contact with the bottom of the second lens assembly (1300).

[0112] The second stopper portion (Sb) may include a third stopper (S3), a fourth stopper (S4), and a fifth stopper (S5). The third stopper (S3), the fourth stopper (S4), and the fifth stopper (S5) may be spaced apart from each other in a first direction. The third stopper (S3) and the fifth stopper (S5) may overlap with the first lens assembly (1200) in the optical axis direction. The fourth stopper (S4) may overlap with the second lens assembly (1300) in the optical axis direction. The third stopper (S3), the fourth stopper (S4), and the fifth stopper (S5) may be placed at different heights inside the housing (1100) in the optical axis direction. The fifth stopper (S5) may be placed between the third stopper (S3) and the fourth stopper (S4) in the first direction. The third stopper (S3) can contact the top of the first lens assembly (1200). The fourth stopper (S4) can contact the top of the second lens assembly (1300).

[0113] The first to fourth stoppers (S1, S2, S3, S4) may not overlap with the second magnet part (1420) in the first direction. When the second lens assembly (1300) moves to the top of the housing (1100) and comes into contact with the fourth stopper (S4), the second magnet part (1420) may not overlap with the third stopper (S3) and the fourth stopper (S4) in the first direction. Additionally, when the second lens assembly (1300) moves to the bottom of the housing (1100) and comes into contact with the second stopper (S2), the second magnet part (1420) may not overlap with the first stopper (S1) and the second stopper (S2) in the first direction.

[0114] The fifth stopper (S5) may overlap with the magnet part (1420) in the first direction. When the first lens assembly (1200) and the second lens assembly (1300) move to the top of the housing (1100) and come into contact with the third stopper (S3) and the fourth stopper (S4), the first magnet part (1410) and the second magnet part (1420) may overlap with the fifth stopper (S5) in the first direction.

[0115] The camera actuator (1000) according to the embodiment may include a magnet part (1400).

[0116] The magnet portion (1400) may be placed on the first lens assembly (1200) and the second lens assembly (1300). The magnet portion (1400) may be placed on the first lens assembly (1200) and the second lens assembly (1300) to move the first lens assembly (1200) and the second lens assembly (1300).

[0117] The magnet part (1400) can move the first lens assembly (1200) and the second lens assembly (1300) by receiving magnetic force from the coil part (1700).

[0118] The magnet portion (1400) can be positioned in a first direction on the side of the first lens assembly (1200) and the second lens assembly (1300).

[0119] The magnet portion (1400) can be placed between the first lens assembly (1200) and the second lens assembly (1300) and the coil portion (1700).

[0120] The magnet portion (1400) can be overlapped with the coil portion (1700) in the first direction.

[0121] The magnet portion (1400) can be fixed to the first lens assembly (1200) and the second lens assembly (1300) by the yoke (1800).

[0122] A yoke (1800) is disposed between the magnet part (1400), the first lens assembly (1200), and the second lens assembly (1300), so that the yoke (1800) can fix the magnet part (1400) onto the first lens assembly (1200) and the second lens assembly (1300).

[0123] The magnet portion (1400) may include a first magnet portion (1410) disposed on a first lens assembly (1200) and a second magnet portion (1420) disposed on a second lens assembly (1300).

[0124] The first magnet part (1410) may be placed on the first lens assembly (1200). The first magnet part (1410) may move the first lens assembly (1200). The first magnet part (1410) may be placed on a side perpendicular to the first direction of the first lens assembly (1200). The first magnet part (1410) may be placed between the first lens assembly (1200) and the coil part (1700). The first magnet part (1410) may be fixed on the first lens assembly (1200) by the first yoke (1810). A first yoke (1810) is positioned between the first magnet part (1410) and the first lens assembly (1200) so that the first yoke (1810) can fix the first magnet part (1410) on the first lens assembly (1200). The first magnet part (1410) may not overlap with the first to third stoppers (S1, S2, S3) in the first direction.

[0125] The second magnet part (1420) may be placed on the second lens assembly (1300). The second magnet part (1420) may move the second lens assembly (1300). The second magnet part (1420) may be placed on a side perpendicular to the first direction of the second lens assembly (1300). The second magnet part (1420) may be placed between the second lens assembly (1300) and the coil part (1700). The second magnet part (1420) may be fixed on the second lens assembly (1300) by the second yoke (1820). A second yoke (1820) is positioned between the second magnet part (1420) and the second lens assembly (1300) so that the second yoke (1820) can fix the second magnet part (1420) onto the second lens assembly (1300). The second magnet part (1400) may not overlap with the first to fourth stoppers (S1, S2, S3, S4) in the first direction.

[0126] In one embodiment, the first magnet section (1410) and / or the second magnet section (1420) may be the magnet section (1400) of FIG. 2. The first magnet section (1410) and / or the second magnet section (1420) may include a plurality of magnets arranged in a Halbach array. For example, the first magnet section (1410) and / or the second magnet section (1420) may include a first magnet (1401), a second magnet (1402), and a third magnet (1403). The plurality of magnets included in the first magnet section (1410) and / or the second magnet section (1420) may be arranged sequentially side by side along the optical axis direction. For example, the first magnet (1411), the second magnet (1412), and the third magnet (1413) may be arranged sequentially side by side along the optical axis direction. Additionally, the upper surface of the first magnet part (1410) may be arranged in one direction of the x-axis direction, and the upper surface of the second magnet part (1410) may be arranged facing the other direction of the x-axis direction.

[0127] Referring to FIGS. 7 to 9, the camera actuator (1000) according to the embodiment may further include a yoke (1800) disposed between the first lens assembly (1200) and the second lens assembly (1300) and the magnet part (1400).

[0128] The yoke (1800) is positioned between the first and second lens assemblies (1200, 1300) and the magnet portion (1400) to fix the magnet portion (1400) onto the first and second lens assemblies (1200, 1300). The yoke (1800) may be positioned in a first direction on the side of the first and second lens assemblies (1200, 1300).

[0129] The yoke (1800) may include a first yoke (1810) disposed between the first lens assembly (1200) and the first magnet part (1410), and a second yoke (1820) disposed between the second lens assembly (1300) and the second magnet part (1420).

[0130] The first yoke (1810) may be positioned between the first lens assembly (1200) and the first magnet part (1410). The first yoke (1810) may be positioned on the side of the first lens assembly (1200) to secure the first magnet part (1410) onto the first lens assembly (1200).

[0131] The second yoke (1820) may be positioned between the second lens assembly (1300) and the second magnet part (1420). The second yoke (1820) may be positioned on the side of the second lens assembly (1300) to secure the second magnet part (1420) onto the second lens assembly (1300).

[0132] When current flows through the coil portion (1700) located within the magnetic field formed by the magnet assembly (100), a Lorentz force is generated, and the magnet assembly (100) is driven.

[0133] As the magnitude of the magnetic field radiated in the direction of the coil portion (1700) increases, the driving force of the magnet assembly (100) increases, and thus the driving force of the lens assembly (200) fixed to the magnet assembly (100) also increases. At this time, the magnetic field radiated in the opposite direction to the direction of the coil portion (1700) may cause interference with the operation of other magnets or other electronic components.

[0134] As such, appropriate amplification or shielding according to the radiation direction of the magnetic field of the magnet assembly (100) is important for the performance of the actuator.

[0135] The driving force (F) applied to the magnet assembly (100) is obtained according to the following.

[0136] F (driving force) = B (magnetic force) × I (current) × L (coil length)

[0137] That is, the driving force (F) is proportional to the magnitude (I) of the current applied to the coil section (1700), the length (L) of the coil section (1700), and the magnetic force (B) of the magnet assembly (100).

[0138] By using the magnet assembly according to the present invention, the magnetic flux in the region requiring strong magnetic flux can be amplified further, and the magnetic flux in the region not requiring strong magnetic flux can be shielded to a lower level; therefore, the camera actuator of the present invention employing this assembly can drive the lens module with a stronger driving force using the same current and coil.

[0139] Although the present invention has been described above, those skilled in the art will recognize that the invention may be implemented in other forms while maintaining the technical concept and essential features of the invention.

[0140] The scope of the present invention shall be defined by the claims, but all modifications or variations derived from configurations directly derived from the descriptions in the claims, as well as configurations equivalent thereto, shall be interpreted as being included within the scope of the present invention.

Claims

1. A magnet section in which three magnets are formed in a Halbach arrangement; and It includes a yoke that contacts at least a portion of the lower surface, left side, and right side of the magnet part, and A magnet assembly in which the left and right sides of the magnet part are attached with double-sided tape and the bottom surface is fixed with adhesive.

2. In Paragraph 1, A magnet assembly characterized in that at least one of the above magnets has polarity divided diagonally.

3. In Paragraph 1, A magnet assembly characterized in that the yoke comprises a flat plate in contact with the lower surface of the magnet part and a side reinforcing part in contact with the side of the magnet part, wherein the upper end of the side reinforcing part coincides with the upper surface of the magnet part.

4. In Paragraph 3, A magnet assembly in which the area of ​​the side reinforcement part is 45% or more of the side area of ​​the magnet part.

5. In Paragraph 3, The above yoke is a magnet assembly further comprising additional reinforcing members that contact the front and back surfaces of the magnet part.

6. In Paragraph 3, A magnet assembly in which the adhesive area of ​​the above-mentioned double-sided tape is 85% or more of the area of ​​the above-mentioned side reinforcement.

7. In Paragraph 3, A magnet assembly in which the horizontal length of the adhesive area of ​​the above-mentioned double-sided tape is the same as the horizontal length of the above-mentioned side reinforcement.

8. In Paragraph 1, A magnet assembly in which the amount of adhesive applied is such that it can cover 70 to 90% of the area of ​​the lower surface of the magnet part with a thickness of 8 to 10 μm.

9. A step of attaching double-sided tape of a predetermined size to the inner surface of the side reinforcement of the yoke (S10); Step (S20) of applying a certain amount of adhesive to the flat plate of the yoke; Step of attaching left and right magnets (S30); A method for manufacturing a magnet assembly, comprising the step (S40) of attaching a center magnet.

10. An actuator for a camera comprising a magnet assembly of any one of claims 1 to 8 or assembled by the manufacturing method of claim 9.

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