Inductor component and electronic device

Abstract

An inductor component and an electronic device, the inductor component comprising a blank, a coil and two external electrodes, the coil comprising a winding portion and two lead-out portions, the width of the lead-out portions being greater than the width of the winding portion, the external electrodes being provided on the blank, in a projection plane along the thickness direction of the blank, the winding portion being spaced apart from the center line of the lead-out portions along the center line in the line width direction, the winding portion having two first side edges in the line width direction, the lead-out portions having two second side edges in the line width direction, wherein the distance between one first side edge and the opposite one second side edge is h1, the distance between the other first side edge and the other second side edge is h2, neither h1 nor h2 is 0, and h1 and h2 are not equal. This design can force the stress originally concentrated on one side of the connection between the winding portion and the lead-out portion to be dispersed, which is equivalent to adding a stress buffer zone between the winding portion and the widened lead-out portion, thereby inhibiting the initiation of fatigue cracks and effectively achieving full release of stress.

Description

Technical Field

[0001] This application relates to the field of electronic devices, and more particularly to an inductor component and an electronic device. Background Technology

[0002] Inductors are widely used in electronic devices such as mobile phones and tablets because they can perform inductive functions. An inductor mainly consists of a blank, a coil disposed within the blank, and external electrodes electrically connected to the coil. Typically, the coil includes a wound portion and a lead-out portion connecting the wound portion and the external electrodes.

[0003] In related technologies, in order to reduce the possibility of breakage due to shrinkage stress on the lead-out portion, the line width of the lead-out portion is usually set to be greater than that of the winding portion in the line width direction, so as to reduce the shrinkage stress of the lead-out portion.

[0004] However, in high-current scenarios, stress distribution is often too concentrated at the connection between the coil and the lead-out part, and long-term use can easily lead to open-circuit failure due to fatigue accumulation. Summary of the Invention

[0005] This application discloses an inductor component and electronic device that can effectively mitigate the difference in linewidth between the winding portion and the lead-out portion, thereby achieving full stress release.

[0006] To achieve the above objectives, in a first aspect, embodiments of this application disclose an inductor component, comprising: blank; A coil is disposed in the blank body. The coil includes a winding portion and two lead-out portions. Both lead-out portions are connected to the winding portion. Along the line width direction of the winding portion, the width of the lead-out portions is greater than the width of the winding portion. Two external electrodes are disposed on the blank, and the two external electrodes are respectively electrically connected to the corresponding lead-out portions; In the projection plane along the thickness direction of the blank, the center line of the winding portion along the line width direction and the center line of the lead-out portion along the line width direction are spaced apart in the line width direction, so that the lead-out portion is eccentrically positioned relative to the winding portion. Along the line width direction, the winding portion has two opposing first sides, and the lead-out portion has two opposing second sides. The two second sides are respectively positioned opposite the two first sides. The vertical distance from one first side to its opposing second side is h1, and the vertical distance from the other first side to its opposing second side is h2. In this case, h1 and h2 are both non-zero, and h1 and h2 are not equal.

[0007] Secondly, this application also discloses an electronic device including an inductor component as described in the first aspect above.

[0008] Compared with the prior art, the beneficial effects of this application are: In the inductor component and electronic device disclosed in this application, by setting the center line of the winding portion along the linewidth direction and the center line of the lead-out portion along the linewidth direction to be spaced apart, and simultaneously limiting the vertical distances on both sides of the winding portion and the lead-out portion to be non-zero and unequal, that is, by setting the lead-out portion eccentrically relative to the winding portion, both h1 and h2 are non-zero and unequal, thereby forcing the stress originally concentrated on one side of the connection between the winding portion and the lead-out portion to be dispersed. This is equivalent to adding a stress buffer zone between the winding portion and the widened lead-out portion, thereby suppressing the initiation of fatigue cracks and effectively achieving full stress release. Attached Figure Description

[0009] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0010] Figure 1 This is a schematic diagram of the structure of the inductor component disclosed in this application; Figure 2 This is an exploded view of the inductor component disclosed in this application; Figure 3 This is one of the schematic diagrams of the inductor component disclosed in this application, viewed along the thickness direction perpendicular to the blank. Figure 4 This is the second schematic diagram of the inductor component disclosed in this application, viewed along the thickness direction perpendicular to the blank. Figure 5 This is the third schematic diagram of the inductor component disclosed in this application, viewed along the thickness direction perpendicular to the blank. Figure 6 This is the fourth schematic diagram of the inductor component disclosed in this application, viewed along the thickness direction perpendicular to the blank. Figure 7 This is the fifth schematic diagram of the inductor component disclosed in this application, viewed along the thickness direction perpendicular to the blank. Figure 8 yes Figure 7 A magnified view of a portion of point M in the image; Figure 9 yes Figure 7Another magnified view of point M in the image; Figure 10 yes Figure 7 Another magnified view of point M in the image; Figure 11 This is the fifth schematic diagram of the inductor component disclosed in this application, viewed along the thickness direction perpendicular to the blank. Figure 12 yes Figure 11 A magnified view of a portion at point N; Figure 13 This is a thermal stress simulation diagram of the inductor component disclosed in this application; Figure 14 This is a thermal stress distribution diagram of the inductor component disclosed in this application; Figure 15 This is a schematic diagram of the structure of the electronic device disclosed in this application.

[0011] Explanation of reference numerals in the attached figures: Inductor component - 100; blank - 10; insulating layer - 10a; first side surface - 11; second side surface - 12; first end face - 13; second end face - 14; bottom surface - 15; top surface - 16; coil - 20; winding portion - 21; first side edge - 21a; first inner side edge - 210; first outer side edge - 211; lead-out portion - 22; transition portion - 22a; widened lead-out portion - 22b; contour edge - 220; first line segment - 220a; second line segment - 220b; third line segment - 220c; first contour edge - 220d; second contour edge - 220e; fourth line segment - 2201; fifth line segment - 2202; second side edge - 221; second inner side edge - 221c; second outer side edge - 221d; external electrode - 30; Electronic equipment - 200; Length direction - X; Width direction - Y; Height direction - Z. Detailed Implementation

[0012] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0013] In this application, the terms "upper," "left," "right," "front," "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0014] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0015] Furthermore, the terms "set up," "equipped with," and "connected" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0016] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, components, or parts (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, components, or parts. Unless otherwise stated, "a plurality of" means two or more.

[0017] As described in the background section of this application, when the line width of the lead-out portion is set to be greater than that of the winding portion to reduce the shrinkage stress of the lead-out portion, if the winding portion and the lead-out portion are symmetrically arranged in the width direction, the stress may be concentrated at the connection between the winding portion and the lead-out portion, which may lead to open circuit failure. Moreover, the symmetrical arrangement of the two is not conducive to the design freedom of the winding portion in the billet, and thus not conducive to optimizing the utilization rate of the internal space of the billet.

[0018] Based on this, this application discloses an inductor component and an electronic device. By designing the positions of the lead-out portion and the winding portion in the line width direction, the lead-out portion is eccentrically positioned relative to the winding portion. Furthermore, the vertical distances between the two first sides of the winding portion and the two second sides of the lead-out portion in the line width direction are unequal; that is, the lead-out portion is asymmetrically designed relative to the winding portion. This forces the stress originally concentrated at the connection between the winding portion and the widened lead-out portion to be dispersed, effectively adding a stress buffer zone between the winding portion and the lead-out portion. This suppresses the initiation of fatigue cracks and effectively achieves sufficient stress release.

[0019] Furthermore, the asymmetrical design of the lead-out section and the winding section provides greater design freedom for the winding section inside the billet, which is beneficial for optimizing the utilization of the internal space of the billet.

[0020] In addition, this application also designs the specific structure of the lead-out portion and the connection between the lead-out portion and the winding portion, thereby mitigating the difference in linewidth variation between the winding portion and the lead-out portion, ensuring sufficient stress release between the winding portion and the lead-out portion, and reducing the risk of cracks occurring at the winding portion or the lead-out portion.

[0021] The technical solution of this application will be further described below with reference to the embodiments and accompanying drawings.

[0022] Please refer to the following: Figures 1 to 3 , Figure 1 This is a schematic diagram of the structure of the inductor component disclosed in this application. Figure 2 This is an exploded view of the inductor component disclosed in this application. Figure 3 This is a front view of the inductor component disclosed in this application (viewing only the coil on a single insulating layer). This application discloses an inductor component 100, including a blank 10, a coil 20, and two external electrodes 30. The coil 20 is typically disposed within the blank 10, and includes a winding portion 21 and two lead-out portions 22, both of which are connected to the winding portion 21. The two external electrodes 30 are disposed in the blank 10 and are electrically connected to their respective lead-out portions 22.

[0023] It is understood that the inductor component 100 is electrically connected to the wiring of a circuit board (not shown) via the two external electrodes 30. The inductor component 100 is used, for example, as an impedance matching coil 20 (matching coil 20) in high-frequency circuits, in electronic devices 200 such as personal computers, DVD players, digital cameras, TVs, mobile phones, automotive electronics, and medical / industrial machinery. However, the application of the inductor component 100 is not limited to this; for example, it can also be used in tuning circuits, filtering circuits, rectifier smoothing circuits, etc.

[0024] like Figure 1 As shown, in some embodiments, the blank 10 is formed in a generally cuboid shape. The blank 10 includes: a first side surface 11 and a second side surface 12 opposite to each other; a first end surface 13 and a second end surface 14 opposite to each other; and two opposite first surfaces, a bottom surface 15 and a top surface 16, connecting the first side surface 11 and the second side surface 12 and the first end surface 13 and the second end surface 14. That is, the outer surface of the blank 10 is formed by the first side surface 11, the second side surface 12, the first end surface 13, the second end surface 14, the bottom surface 15, and the top surface 16. In addition, such as Figure 1As shown, the X direction is orthogonal to the first end face 13 and the second end face 14, and extends from the first end face 13 toward the second end face 14. The Y direction is orthogonal to the first side face 11 and the second side face 12, and extends from the second side face 12 toward the first side face 11. The Z direction is orthogonal to the bottom surface 15 and the top surface 16, and extends from the bottom surface 15 toward the top surface 16. The X direction is also called the length direction of the billet 10, the Y direction is also called the width direction of the billet 10, and the Z direction is also called the height direction of the billet 10. The X, Y, and Z directions are mutually orthogonal.

[0025] In some embodiments, a plurality of insulating layers 10a are stacked to form a blank 10. Specifically, a plurality of insulating layers 10a are stacked from the second side surface 12 toward the first side surface 11 to form the blank 10. Furthermore, the number of insulating layers 10a is not limited to... Figure 3 The quantity.

[0026] Furthermore, in this application, the stacking is not limited to the direction of stacking during manufacturing, but also includes the opposite direction.

[0027] In some embodiments, the insulating layer 10a is made of a magnetic material or a non-magnetic material. Examples of magnetic materials include ferrite, while examples of non-magnetic materials include glass such as borosilicate glass, alumina, and resin. Multiple insulating layers 10a are stacked in the Y direction. The insulating layer 10a is a layer extending in an XZ plane orthogonal to the stacking direction in the Y direction. The thickness of the insulating layer 10a is not particularly limited; for example, it may be the same thickness. Furthermore, due to firing processes, the interface between two adjacent insulating layers 10a may sometimes be unclear. Additionally, the thickness of the insulating layers 10a may vary. For example, the insulating layer 10a corresponding to the second side 12 and the insulating layer 10a corresponding to the first side 11 may be thicker or thinner than the other insulating layers 10a. Please see also Figure 1 and Figure 2 In some embodiments, of the two external electrodes 30, one electrode may be an L-shaped terminal extending from the first end face 13 to the bottom face 15, and the other may be an L-shaped terminal extending from the second end face 14 to the bottom face 15. Alternatively, one of the external electrodes 30 may also be a C-shaped terminal extending from the top face 16 along the first end face 13 to the bottom face 15, and the other external electrode 30 may also be a C-shaped terminal extending from the top face 16 along the second end face 14 to the bottom face 15.

[0028] Please see Figure 3In some embodiments, the coil 20 may include a plurality of wound portions 21 wound along a plane, and a through hole 20a connecting the plurality of wound portions 21. The number of wound portions 21 may be four, six, or more. It is understood that the wound portions 21 may be sandwiched by insulating layers 10a and stacked along one side of the thickness direction of the blank 10. The number of turns in each wound portion 21 may be less than one turn, but may also be more than one turn.

[0029] It is understandable that when the winding portion 21 is multi-layered, along the thickness direction of the blank 10, one lead-out portion 22 is connected to the winding portion 21 stacked on the first layer, and the other lead-out portion 22 is connected to the winding portion 21 stacked on the last layer, so as to be electrically connected to the two external electrodes 30 respectively.

[0030] In some embodiments, in the projection plane along the thickness direction of the blank 10, the center line O1 of the winding portion 21 along the line width direction and the center line O2 of the lead-out portion 22 along the line width direction are spaced apart in the line width direction. That is, the center line O2 of the lead-out portion 22 and the center line O1 of the winding portion 21 are not on the same straight line; in other words, the lead-out portion 22 is eccentrically positioned relative to the winding portion 21. This arrangement means that the center line O2 of the lead-out portion 22 does not need to be aligned with the center line O1 of the winding portion 21, thereby allowing the lead-out portion 22 to be flexibly positioned according to the position of the external electrode 30, and thus enabling the lead-out portion 22 to connect to the external electrode 30 better and more stably.

[0031] It is understood that the lead-out portion 22 is eccentrically positioned relative to the winding portion 21. This can include the centerline of the lead-out portion 22 being positioned close to the inner side of the winding portion 21 (the inner side that constitutes part of the graphic space enclosed by the winding portion 21 on the blank), or the centerline of the lead-out portion 22 being positioned close to the outer side of the winding portion 21. These two cases will be described in detail later.

[0032] The winding portion 21 includes two first side edges 21a opposite each other along the line width direction (i.e., the aforementioned height direction Z). The lead-out portion 22 includes two second side edges 221 along the line width direction. The two second side edges 221 are respectively disposed opposite to the two first side edges 21a. The vertical distance from one first side edge 21a to its opposite second side edge 221 is h1, and the vertical distance from the other first side edge 21a to its opposite second side edge 221 is h2. In this case, h1 and h2 are both non-zero, and h1 and h2 are not equal.

[0033] In other words, this application limits the vertical distances on both sides of the winding portion 21 and the lead-out portion 22 to be non-zero and unequal. That is, based on the eccentric setting of the lead-out portion 22 relative to the winding portion 21, the vertical distances on both sides of the two are further considered. As a result, the connection between the two sides of the winding portion 21 and the lead-out portion is asymmetrical, which forces the stress that might have been concentrated on one or both sides to be dispersed. This is equivalent to adding a stress buffer zone between the winding portion and the lead-out portion, reducing or suppressing the initiation of fatigue cracks.

[0034] Meanwhile, due to the asymmetrical design between the lead-out portion 22 and the winding portion 21, the design of the winding portion 21 inside the billet is given greater freedom, which is conducive to optimizing the utilization rate of the internal space of the billet.

[0035] like Figure 3 As shown, in some embodiments, the two first sides 21a of the winding portion 21 are a first inner side 210 and a first outer side 211, respectively. The first inner side 210 is configured to form part of the graphic space enclosed by the winding portion 21 on the blank 10. Along the linewidth direction of the winding portion 21, the center line O2 of the lead-out portion 22 is parallel to and close to the first inner side 210. In other words, the lead-out portion 22 is offset further inward of the winding portion 21 in the linewidth direction, thereby freeing up more area for the winding portion 21 above the inductor component 100 and reducing the area occupied by the winding portion 21. This allows for the design of maximizing the winding area of ​​the winding portion 21 while achieving sufficient stress release, which is beneficial to improving the electrical performance of the inductor component 100.

[0036] In these embodiments, h1 > h2. That is, when the centerline of the lead-out portion is closer to the first inner edge, the vertical distance from the first inner edge of the winding portion to the second inner edge of the lead-out portion is greater. This provides a longer stress relief path at the connection between the winding portion and the lead-out portion.

[0037] like Figure 4 As shown, in other embodiments, along the line width direction, the center line of the lead-out portion 22 is parallel to and close to the first outer side 211. That is, the lead-out portion 22 is offset more towards the outside of the winding portion 21. In this way, the lead-out portion 22 can be closer to the outer electrode 30, making the connection path between the lead-out portion 22 and the outer electrode 30 shorter and more direct. This helps to reduce the impedance of the line connection and also improves the stability and reliability of the connection between the two.

[0038] In these embodiments, h1 < h2. That is, when the centerline of the lead-out portion is closer to the first outer edge, the vertical distance from the first outer edge of the winding portion to the second outer edge of the lead-out portion is greater. This provides a longer stress relief path at the connection of the outer edges.

[0039] Combination Figures 3 to 5 As shown, in some embodiments, the two second sides 221 of the lead-out portion 22 are respectively positioned opposite the two first surfaces of the blank (e.g., the aforementioned top surface 16 and bottom surface 15, which will be used as an example below), and one of the two second sides 221 faces the bottom surface 15, while the other faces the top surface 16. Furthermore, the distance H1 from one second side 221 to the bottom surface 15 is not equal to the distance H2 from the other second side 221 to the top surface 16. That is, the lead-out portion 22 is also eccentrically positioned relative to the center of the blank 10.

[0040] Since the lead-out portion 22 is electrically connected to the external electrode 30, which is typically mounted on the blank 10, the lead-out portion 22 is also eccentrically positioned relative to the center of the blank 10 in the line width direction. Thus, when the lead-out portion 22 is connected to the external electrode 30, the volume of the solder joint and the solder climb height formed on both sides of the lead-out portion 22 are different. The narrower side (h1 or h2) can be cured first, thereby providing an anchoring effect. This helps guide and release welding thermal stress, reduces the risk of overall solder joint cracking, and improves the reliability of the inductor component under thermal cycling.

[0041] Furthermore, since the lead-out portion 22 is also eccentrically designed relative to the winding portion 21, and the vertical distance between any first side 21a of the winding portion 21 and the corresponding second side 221 of the lead-out portion 22 is not zero, the eccentric design of the lead-out portion 22 and the blank 10 can prevent the first side of the winding portion 21 from directly extending onto the lead-out portion 22. This allows the winding portion 21 to have a more optimized asymmetrical layout within the blank 10. By adjusting the eccentricity, the DC resistance, inductance, and other parameters of the inductor can be optimized without changing the external dimensions of the blank 10, thus meeting more diverse circuit design requirements.

[0042] In some embodiments, one of the second side edges 221 of the lead-out portion 22 can be located on the surface opposite it. For example, the second side edge 221 opposite to the top surface can be located on the top surface 16, or the second side edge 221 opposite to the bottom surface can be located on the bottom surface 15. In this way, on the one hand, it is convenient for the lead-out portion 22 to be directly connected to the external electrode 30, shortening the connection path between the two and thus helping to reduce the connection resistance. On the other hand, the lead-out portion 22 utilizes the space of the outer side of the winding portion 21, thereby increasing the width of the lead-out portion 22 while reducing the area occupied by the lead-out portion 22 on the winding area of ​​the coil.

[0043] In addition, this design also allows the connection between the lead-out portion 22 and the blank body 10 to be asymmetrical, thereby allowing the stress contraction on both sides of the lead-out portion 22 to be at different locations, alleviating the possible indentation problem of the lead-out portion 22, and facilitating the full release of stress in the lead-out portion 22.

[0044] like Figure 6 As shown, in some embodiments, when one of the second side edges 221 of the lead-out portion 22 is located on the surface opposite it, the following relationship is satisfied: the maximum length of the blank 10 along the first direction (length direction) is L0, and the length of the second side edge 221 located on the surface is La, satisfying 0.05L0≤La≤0.3L0. Thus, the lead-out portion 22 can be exposed on the corresponding surface with sufficient length, so that the lead-out portion 22 can have a sufficient and stable contact area with the external electrode on the corresponding surface, avoiding the problem of unstable and unreliable connection between the two due to the small contact area.

[0045] When the relationship exceeds the lower limit, the length of the lead-out portion 22 exposed on the corresponding surface is too short, which may result in too small a contact area with the external electrode 30, affecting the connection between the two.

[0046] When the relationship exceeds the upper limit, the length of the lead-out portion 22 exposed on the corresponding surface is too long. Given that the length of the blank 10 is constant, the extension length of the winding portion 21 is compressed, affecting the inductance of the inductor component.

[0047] It is understandable that La can be 0.05L0, 0.1L0, 0.15L0, 0.2L0, 0.25L0, 0.3L0, etc.

[0048] like Figures 3 to 4 , Figure 6As shown, in one example, the second side 221 may be located on the top surface 16. Since the top surface 16 is the surface of the blank 10 along the height direction, the length of the blank 10 along the length direction corresponds to the length of the long side of the top surface 16. In this case, the center line of the lead-out portion 22 is set closer to the outer side of the winding portion (the side closer to the top surface).

[0049] In another example, the second side 221 opposite to the bottom surface 15 may be located on the bottom surface 15. In this case, the center line of the lead-out portion 22 is set closer to the inner side of the winding portion 21 (the side closer to the bottom surface).

[0050] In some embodiments, when one of the second side edges 221 is located on the surface opposite it, there is a distance between the other second side edge 221 and the surface opposite it. That is, typically, only one second side edge 221 of the lead-out portion is located on the surface of the blank 10. Thus, the width of the lead-out portion 22 is appropriate, so that the lead-out portion 22 can both meet the connection with the external electrode 30 and provide more space for the pattern setting of the winding portion 21.

[0051] like Figure 3 , Figure 4 , Figure 6 As shown, in some embodiments, the lengths of the two second sides 221 of the lead-out portion 22 are unequal in the first direction. For example, if the length of the second side located on the blank 10 is La, then the length of the second side 221 opposite to the bottom surface 15 is Lb, satisfying that La > Lb. In other words, the length of the second side 221 located on the surface is greater. The greater length of the second side 221 located on the surface means that the lengths of the two second sides 221 of the lead-out portion 22 are also asymmetrically arranged. Thus, the second side 221 located on the surface has sufficient length to connect with the external electrode 30, while the second side 221 not located on the surface is shorter, which allows for more space for the winding portion 21, making the arrangement of the winding portion 21 more flexible and facilitating the maximization of its pattern space.

[0052] Of course, in other embodiments, the reverse can also be true, that is, the length of the second side on the surface is less than the length of the second side 221 not on the surface. Alternatively, the lengths of the two second sides 221 can also be equal.

[0053] In some embodiments, the maximum width of the blank 10 along the line width direction is W, and the maximum width of the lead-out portion 22 along the line width direction is H, satisfying H=0.3W~0.5W.

[0054] By limiting the width of the lead-out portion 22 and the maximum width of the inductor component to satisfy this relationship, it is possible to ensure that the lead-out portion 22 has sufficient width to handle large currents without excessively wasting space.

[0055] If H is less than 0.3W, the width and cross-sectional area of ​​the lead-out portion 22 will be too small, which may increase the DC resistance and make it unable to handle large currents. At the same time, the small cross-sectional area of ​​the lead-out portion 22 may result in insufficient mechanical strength, making it prone to breakage at this location.

[0056] If H is greater than 0.5W, the width of the lead-out portion 22 will be too large. An excessively large lead-out portion 22 may encroach on the space of the winding portion 21, which may reduce the number of coil turns under the same blank size, resulting in a decrease in inductance.

[0057] For example, the maximum width of the lead-out portion 22 along the line width direction can be 0.3W, 0.4W, 0.5W, etc.

[0058] In some embodiments, the width H of the lead-out portion 22 and the length of the second side of the lead-out portion 22 on the surface of the blank 10 satisfy: 0.4H ≤ La ≤ 1.5H. This balances stress relief of the lead-out portion 22 with minimizing encroachment on the coil winding area of ​​the winding portion 21. If the above relationship is below the lower limit, the DC resistance may increase, the skin effect may intensify, and the lead-out portion 22 may break due to excessive stress concentration. If the relationship exceeds the upper limit, the parasitic capacitance may increase, resulting in low space utilization.

[0059] It is understandable that La can take values ​​of 0.4H, 0.5H, 0.6H, 0.7H, 0.8H, 0.9H, 1.0H, 1.1H, 1.2H, 1.3H, 1.4H, 1.5H, etc.

[0060] In some embodiments, the distance between the center line O1 of the winding portion 21 along the line width direction and the center line O2 of the lead-out portion 22 along the line width direction is T, and the line width of the winding portion 21 is W0, satisfying: T=0.25W0~0.55W0.

[0061] T represents the degree of eccentricity between the lead-out portion 22 and the winding portion 21 in the line width direction. By limiting the relationship between the distance T between the center lines of the winding portion 21 and the lead-out portion 22 and the line width of the winding portion 21, it is possible to achieve stress relief while maximizing the winding area or product reliability.

[0062] If T is too small, the distance between the center lines of the winding portion 21 and the lead-out portion 22 will be too small, meaning the offset between their center lines will be too small. This may result in limited area freed up by the widened lead-out portion 22b in the inner winding space, leading to an insignificant improvement in the performance of the inductor component 100. If T is too large, the lead-out portion 22 may be too close to the edge of the blank 10, potentially posing a risk during manufacturing and affecting product reliability.

[0063] It is understandable that the value of T can be 0.25W0, 0.3W0, 0.35W0, 0.4W0, 0.45W0, 0.5W0, 0.55W0, etc.

[0064] In some embodiments, as described above, the two first side edges 21a can be a first inner side edge 210 and a first outer side edge 211, respectively. The first inner side edge 210 is part of the graphic space enclosed by the winding portion 21 on the blank. The two second side edges 221 can be a second inner side edge 221c and a second outer side edge 221d, respectively. Regarding the inequality of h1 and h2, there are two cases: In one example, when the center line of the lead-out portion 22 is parallel to and close to the first inner side 210 along the line width direction, h1 is greater than h2. Since the center line of the lead-out portion 22 is parallel to and close to the first inner side, the lead-out portion 22 is shifted as a whole towards the inside of the winding portion 21, thus freeing up more space for the winding portion 21 above the inductor component.

[0065] In another example, when the centerline of the lead-out portion 22 is parallel to and close to the first outer edge 211 along the line width direction, h2 > h1. That is, the lead-out portion 22 is offset outward from the winding portion 21 as a whole, and the widened lead-out portion 22b can be closer to the external electrode. As a result, the connection path between the lead-out portion 22 and the external electrode 30 is shorter and more direct, which helps to reduce the impedance of the line connection and also improves the stability and reliability of the connection between the two.

[0066] The following sections will explain these two scenarios in detail with specific solutions.

[0067] Please see also Figure 3 , Figure 7 In some embodiments, at least one lead-out portion 22 includes a transition portion 22a and a widened lead-out portion 22b, the transition portion 22a being configured to connect the winding portion 21 and the widened lead-out portion 22b such that the width of the coil 20 increases from the winding portion 21 toward the widened lead-out portion 22b.

[0068] This increase can be a continuous increase, for example, the width of coil 20 gradually increases from the winding portion 21 towards the widened lead portion 22b; or it can be an intermittent increase, for example, the width of coil 20 first increases and then remains constant from the winding portion 21 towards the widened lead portion 22b, or first increases, then remains constant, and then increases again. This embodiment will be described in detail below regarding this type of increase.

[0069] In the projection plane along the thickness direction of the blank 10, the transition portion 22a includes two contour edges 220, which are respectively connected to the corresponding first side edge 21a and second side edge 221.

[0070] In other words, when the transition portion 22a connects the winding portion 21 and the widened lead-out portion 22b, the two ends of one contour edge 220 are respectively connected to one of the first side edges 21a and one of the second side edges 221, and the two ends of the other contour edge 220 are respectively connected to the other first side edge 21a and the other second side edge 221. In other words, the orientation of the contour edge 220 directly affects the width variation of the line width from the winding portion 21 to the widened lead-out portion 22b. This will be discussed in detail below.

[0071] Please refer to the following: Figures 7 to 10 In some embodiments, the two contour edges 220 are respectively a first contour edge 220d and a second contour edge 220e. The first contour edge 220d is connected to one of the first side edges 21a and one of the second side edges 221. The second contour edge 220e is connected to another first side edge 21a and another second side edge 221. The first contour edge 220d has a first intersection point A with one of the first side edges 21a and a second intersection point B with one of the second side edges 221. The second contour edge 220e has a fourth intersection point D with another first side edge 21a and a third intersection point C with another second side edge 221. The perpendicular line passing through the second intersection point B and the third intersection point C and perpendicular to the first side 21a is the first perpendicular line. The perpendicular distance between the first intersection point A and the second intersection point B on the first perpendicular line is h1, and the perpendicular distance between the third intersection point C and the fourth intersection point D on the first perpendicular line is h2.

[0072] The fact that h1 and h2 are not equal means that the vertical distance from the inner side of the winding portion 21 to the inner side of the widened lead-out portion 22b is not equal to the vertical distance from the outer side of the winding portion 21 to the outer side of the widened lead-out portion 22b. This asymmetrical widening method means that the transition from the winding portion 21 to the widened lead-out portion 22b on the inner and outer sides is asynchronous and at different speeds. This allows for a longer transition path to be provided on the side with stress concentration, based on the stress conditions, so that stress release is more complete.

[0073] Furthermore, h1 and h2 are not both 0, meaning that the first intersection point A and the second intersection point B are not at the same point, or the third intersection point C and the fourth intersection point D are not at the same point. Thus, the sides of the winding portion 21 and the widened lead-out portion 22b are not on the same straight line. In other words, the width of the widened lead-out portion 22b extends both inside and outside the winding portion 21, thereby avoiding the problem of unilateral stress concentration caused by widening the widened lead-out portion 22b only on one side.

[0074] It is understandable that one of h1 and h2 is the vertical distance between the inner side of the winding portion 21 and the inner side of the widened lead-out portion 22b, and the other is the vertical distance between the outer side of the winding portion 21 and the outer side of the widened lead-out portion 22b, which will be explained later.

[0075] In some embodiments, as described above, the two first side edges 21a can be a first inner side edge 210 and a first outer side edge 211, respectively. The first inner side edge 210 is part of the graphic space enclosed by the winding portion 21 on the blank. The two second side edges 221 can be a second inner side edge 221c and a second outer side edge 221d, respectively. The first contour edge 220d can be connected to the first inner side edge 210 and the second inner side edge 221c, and the second contour edge 220e can be connected to the first outer side edge 211 and the second outer side edge 221d. In other words, the first contour edge 220d is closer to the graphic space of the winding portion 21 than the second contour edge 220e.

[0076] In some examples, when the centerline of the widened lead 22b is parallel to and close to the first inner side 210 along the linewidth direction, h1 > h2. When the centerline of the widened lead 22b is parallel to and close to the first inner side 210, that is, the widened lead 22b is offset towards the inside of the winding portion 21, thereby freeing up more area for the winding portion 21 above the inductor component and reducing the area occupied by the winding portion 21. This allows for the design of maximizing the winding area of ​​the winding portion 21 while achieving sufficient stress release, which is beneficial to improving the electrical performance of the inductor component.

[0077] In this case, h1 is greater than h2, corresponding to the first contour edge 220d connected to the inner side of the winding portion 21 as the main path for stress guidance and concentration. Thus, the width transition between the winding portion 21 and the widened lead-out portion 22b is longer and smoother on the inner side, providing sufficient stress relief path. The second contour edge 220e connected to the outer side of the winding portion 21 is a non-load-bearing path, and its transition on the outer side of the winding portion 21 is shorter and more abrupt, enabling rapid convergence of the transition and completion of the transition from point D to point C. This, in turn, helps to reduce the space occupied on the outer side of the winding portion 21.

[0078] In other examples, when the centerline of the widened lead 22b is parallel to and close to the first outer side 211 along the line width direction, h1 < h2. When the centerline of the widened lead 22b is parallel to and close to the first outer side 211, that is, when the widened lead 22b is offset outward from the winding portion 21, the widened lead 22b can be closer to the external electrode. Therefore, the connection path between the widened lead 22b and the external electrode is shorter and more direct, which helps to reduce the impedance of the line connection and also improves the stability and reliability of the connection.

[0079] In this case, h2 is greater than h1, corresponding to the second contour edge 220e connected to the outside of the winding portion 21 as the main path for stress guidance and concentration. Thus, the width transition between the winding portion 21 and the widened lead-out portion 22b is longer and smoother on the outside, providing sufficient stress relief path. Meanwhile, the first contour edge 220d connected to the inside of the winding portion 21 is a non-load-bearing path, with a shorter and more abrupt transition on the outside of the winding portion 21. This allows for rapid convergence of the transition, completing the transition from point A to point B, thereby reducing the space occupied on the inside of the winding portion 21. Therefore, under the same blank conditions, the coil has more turns, which helps improve the electrical performance of the inductor component.

[0080] In some embodiments, when the line width of the winding portion 21 is W0 and h1 > h2, the following conditions are met: h1 = W0 ~ 2W0, h2 = 0.5 W0 ~ 0.95W0.

[0081] When h1 satisfies this relationship, the direction of the first contour edge of the transition section 22a can be better controlled, making the transition of the first contour edge of the transition section 22a smoother and gentler, thereby allowing for sufficient stress release and reducing the area occupied by the winding of the coil 20.

[0082] If h1 is less than W0, that is, the ratio of h1 to W0 is too small and the preset distance is too small, it means that the transition part 22a is compressed and the line width changes very quickly from the winding part 21 to the widened lead-out part 22b, which is not conducive to the full release of stress.

[0083] If h1 > 2W0, that is, the ratio of h1 to W0 is too large and the preset distance is too large, it means that the transition part 22a is unnecessarily stretched, which may occupy the winding area of ​​the coil 20. This results in a reduction in the effective number of winding turns of the coil 20 under the same blank body 10 size, which is not conducive to the improvement of inductance.

[0084] When h2 satisfies this relationship, it can effectively limit the size of the transition portion 22a in the width direction of the winding portion 21, thereby enabling the transition to converge quickly and complete the transition from point D to point C. This makes the transition path from the winding portion 21 to the widened lead-out portion 22b shorter, which is beneficial to reduce the occupation of the outer space of the winding portion 21.

[0085] If h2 is less than 0.5W0, the width of the transition section 22a is too short. Although this is a non-load-bearing area, the transition path from the winding section 21 to the widened lead-out section 22b is insufficient, which may still lead to stress concentration and crack formation.

[0086] If h2 is greater than 0.95W0, the width of the transition section 22a will be too long, which may occupy the outer area of ​​the coil 20. It may also cause the widened lead-out section 22b to protrude from the surface of the blank 10, which is not conducive to the design of the structure.

[0087] Understandably, h1 can take values ​​such as W0, 1.1W0, 1.3W0, 1.5W0, 1.7W0, 1.9W0, 2W0, etc. Correspondingly, h2 can take values ​​such as 0.5W0, 0.6W0, 0.7W0, 0.8W0, 0.9W0, 0.95W0, etc.

[0088] Conversely, if h1 < h2, then h2 = W0 ~ 2W0 and h1 = 0.5 W0 ~ 0.95W0 should be satisfied.

[0089] In some embodiments, along the length of the winding portion 21, the distance from the first intersection point A to the second intersection point B is d1, and the distance from the third intersection point C to the fourth intersection point D is d2, satisfying d1 > d2. Thus, along the length of the winding portion 21, d1 has sufficient length to provide a longer stress relief path, ensuring adequate stress relief. Simultaneously, d2 is less than d1, shortening the distance from the winding portion 21 to the widened lead-out portion 22b, enabling a rapid transition. This reduces the space occupied by the widened lead-out portion 22b along the length of the winding portion 21, allowing the widened lead-out portion 22b to have sufficient extension length to effectively reduce its shrinkage stress, while also ensuring that the widened lead-out portion 22b has sufficient area to connect with the external electrode 30.

[0090] In some embodiments, the width of the winding portion 21 is W0, satisfying d1=1.5W0~2.2W0, d2=0.7W0~1.2W0.

[0091] When the relationship d1 = 1.5W0 ~ 2.2W0 is satisfied, the length of the transition region can be adapted to the width of the winding portion 21, thereby allowing sufficient space / path for stress to be fully released. This effectively reduces the area occupied by the winding of the coil 20 while satisfying stress release requirements. Furthermore, satisfying this relationship also ensures a smoother change in the width of the cross-sectional area of ​​the inductor component 100 from the winding portion 21 to the widened lead portion 22b. This avoids drastic fluctuations in current density caused by sudden changes in cross-sectional area when current flows through the relevant area, thus contributing to the stability of the electrical performance of the inductor component 100.

[0092] When d1 is less than 1.5W0, the value of d1 is too small, which means that the horizontal distance of the transition section 22a is short. The process of stress being transferred from the winding section 21 to the widened lead-out section 22b is too rapid, resulting in stress concentration. This is not conducive to the full release of stress, nor is it conducive to the smooth flow of current, which can easily lead to fluctuations in the electrical performance of the inductor component 100. When d1 is greater than 2.2W0, the value of d1 is too large, which means that the transition section 22a is stretched. Although this can help with stress release, it will occupy the winding area of ​​the winding section 21, which is not conducive to increasing the inductance of the inductor component 100.

[0093] When the relationship d2=0.7W0~1.2W0 is satisfied, the size of the transition section 22a in the length direction of the winding section 21 can be effectively limited, thereby enabling the transition to converge quickly and complete the transition from point D to point C. This makes the transition path from the winding section 21 to the widened lead-out section 22b shorter, leaving more length space for the widened lead-out section 22b.

[0094] If d2 is less than 0.7W0, the length of the transition section 22a is too short. Although this is a non-load-bearing area, the transition path from the winding section 21 to the widened lead-out section 22b is insufficient, which may still lead to stress concentration and crack formation. If d2 is greater than 1.2W0, the length of the transition section 22a is too long, occupying the length space of the widened lead-out section 22b. This may result in insufficient length of the widened lead-out section 22b, which is not conducive to reducing the shrinkage stress of the widened lead-out section 22b, and is also not conducive to the connection between the widened lead-out section 22b and the external electrode 30.

[0095] It is understandable that d1 can take values ​​of 1.5W0, 1.7W0, 1.9W0, 2.1W0, 2.2W0, etc., and d2 can take values ​​of 0.7W0, 0.8W0, 0.9W0, 1W0, 1.1W0, 1.2W0, etc.

[0096] In view of the relevant technology, in order to reduce the possibility of breakage caused by shrinkage stress on the lead-out portion 22, the line width of the lead-out portion 22 is usually set to be greater than the line width of the winding portion 21 in the line width direction of the winding portion 21, so as to reduce the shrinkage stress of the lead-out portion 22.

[0097] However, the inventors discovered through research that the variation in width between the winding portion 21 and the lead-out portion 22 actually affects the adequacy of stress release. For example, if the difference between the line width of the winding portion 21 and the line width of the lead-out portion 22 is very large, the problem of insufficient stress release still exists.

[0098] Based on this, this application also designs the structure of the transition portion 22a connecting the winding portion 21 and the lead-out portion 22. In particular, it controls the angle range of the included angle formed by the intersection of the outline edge 220 of the transition portion 22a with the winding portion 21 and the widened lead-out portion 22b, respectively. This allows for reasonable control of the direction of the outline edge 220 of the transition portion 22a, that is, to make the transition portion 22a have a sufficiently gentle slope. In this way, the outline edge 220 of the transition portion 22a is basically located within the included angle space formed by the included angle, and the direction of the outline edge 220 is gentle and smooth. This makes the width change from the winding portion 21 to the widened lead-out portion 22b gradual rather than abrupt. This can effectively reduce the difference in linewidth change between the winding portion 21 and the widened lead-out portion 22b, so that the stress between the winding portion 21 and the widened lead-out portion 22b is fully released, reducing the risk of cracks at the winding portion 21 or the lead-out portion 22.

[0099] In some embodiments, when the centerline of the widened lead-out portion 22b is parallel to and close to the first inner side 210, and h1 is greater than or equal to a preset distance, the line connecting the first intersection point A and the second intersection point B forms a first angle α with the first perpendicular line P.

[0100] In other embodiments, when the centerline of the widened lead-out portion 22b is parallel to and close to the first outer side 211, and h2 is greater than or equal to a preset distance, the line connecting the third intersection point C and the fourth intersection point D forms a first angle α with the first perpendicular line P.

[0101] It is understandable that the first perpendicular line P refers to the line that passes through the second intersection point B and is perpendicular to the first inner side 210.

[0102] The first included angle α satisfies 30°-60°.

[0103] Since the width of the winding portion 21 is smaller than that of the widened lead portion 22b, the transition portion 22a connects the winding portion 21 and the widened lead portion 22b of the coil 20, thus avoiding the problem of insufficient stress release caused by the abrupt change in width between the winding portion 21 and the widened lead portion 22b. Simultaneously, by controlling the angle range of the first included angle α formed by the intersection of the first or second contour edge 220 of the transition portion 22a with the winding portion 21 and the widened lead portion 22b, respectively, the first included angle α is controlled between 30° and 60°. This allows for reasonable control of the orientation of the contour edge 220 of the transition portion 22a, that is, giving the transition portion 22a a sufficiently gentle slope. This design ensures that the change in width and cross-sectional area of ​​the coil 20 from the winding portion 21 to the widened lead portion 22b is gradual, rather than abrupt. This allows the contour edge 220 within this angle range to effectively disperse and transfer the stress from the widened lead-out portion 22b and the outer electrode to the winding portion 21 along a longer, gentler path, avoiding stress accumulation in local areas and effectively satisfying the stress release effect.

[0104] It is understood that the contour edge 220 containing the first included angle α is approximately or at least partially located within the angular space formed by the first included angle α. The first included angle α can further be 30°-45°, or 30°-55°, etc. The first included angle α can be, for example, 30°, 32°, 35°, 40°, 45°, 50°, 52°, 55°, 58°, 60°, etc.

[0105] Taking the example of the centerline of the widened lead-out portion being parallel to and close to the first inner side, if the first included angle α is too small (e.g., less than 30°), it means that the line connecting the first intersection point A and the second intersection point B is close to being parallel to the first perpendicular line P. This will cause the contour edge 220 to be too steep, that is, a sharp corner with a very small radius of curvature will be formed at the first intersection point A (i.e., the connection point between the transition portion 22a and the winding portion 21), which may cause stress to be highly concentrated at this point, leading to crack generation and connection failure. On the other hand, if the first included angle α is too large (e.g., greater than 60°), although a smoother transition can be obtained, which is beneficial for stress release, this will cause the transition portion 22a to expand outward too early, which may encroach on the graphic space or outer space of the winding portion 21. The effective number of turns and cross-sectional area of ​​the winding portion 21 are key factors determining the inductance. The encroachment of the transition portion 22a on the pattern space means that, under the same blank body 10 size, the cross-sectional area of ​​the winding portion 21 of the coil 20 will be smaller, resulting in a decrease in inductance or an increase in DC resistance, affecting the electrical performance of the inductor component 100. Therefore, this application achieves stress relief while maximizing the effective area of ​​the winding portion 21 by ensuring that the first included angle α is between 30° and 60°.

[0106] In some embodiments, the line width of the winding portion 21 is W0, and the preset distance is h1, satisfying: h1=W0~2W0.

[0107] By limiting the ratio of the winding portion 21 to the preset distance, that is, by limiting the range of the preset distance, the direction of the outline edge 220 of the transition portion 22a can be better controlled, making the transition of the outline edge 220 of the transition portion 22a smoother and gentler, thereby allowing for sufficient stress release and reducing the area occupied by the winding of the coil 20.

[0108] If h1 is less than W0, that is, the ratio of h1 to W0 is too small and the preset distance is too small, it means that the transition part 22a is compressed and the line width changes very quickly from the winding part 21 to the widened lead-out part 22b, which is not conducive to the full release of stress.

[0109] If h1 > 2W0, that is, the ratio of h1 to W0 is too large and the preset distance is too large, it means that the transition part 22a is unnecessarily stretched, which may occupy the winding area of ​​the coil 20. This results in a reduction in the effective number of winding turns of the coil 20 under the same blank body 10 size, which is not conducive to the improvement of inductance.

[0110] It is understandable that h1 can take values ​​such as W0, 1.1W0, 1.3W0, 1.5W0, 1.7W0, 1.9W0, 2W0, etc.

[0111] In some embodiments, at least one of the first contour edge and the second contour edge may include at least one of an arc or a straight line. This allows for more flexible and free design of the transition section, and can be adjusted according to the width changes of the winding section and the widened lead-out section, avoiding stress concentration caused by abrupt changes, while also achieving full stress release.

[0112] Furthermore, when the first included angle α satisfies 30°-60°, the first or second contour edge is approximately or at least partially located within the included angle space formed by the first included angle α. This prevents the contour edge 220 from protruding beyond the space formed by the first included angle α, that is, it prevents the contour edge 220 from extending beyond the line connecting the first intersection point A and the second intersection point B and protruding towards the winding portion 21. On the one hand, it avoids the contour edge 220 protruding too much, which would cause a sudden change in the width from the winding portion 21 to the widened lead-out portion 22b, potentially leading to stress concentration and insufficient stress release. On the other hand, it also avoids the contour edge 220 protruding too much towards the winding portion 21 and occupying the graphic space of the winding portion 21, resulting in a reduction in the graphic space of the winding portion 21 and a reduction in the number of winding turns under the same blank body 10 size, which is not conducive to increasing the inductance.

[0113] Take the first contour edge as an example.

[0114] In one example, such as Figure 8 As shown, Figure 8 The diagram illustrates the case where the first contour edge 220d is a straight line. When the first contour edge 220d is a straight line segment, it can coincide with the line connecting the first intersection point A and the second intersection point B. In this case, the transition portion 22a acts as a connecting bridge between the winding portion 21 and the widened lead-out portion 22b, with a shorter and unique stress transmission path. Consequently, under the constraint of the first included angle α, the stress of the widened lead-out portion 22b can be guided to the winding portion 21 in a more direct and controllable manner, effectively achieving full stress release. Furthermore, when the first contour edge 220d is a straight line segment, the deformation and stress distribution of the transition portion 22a corresponding to the first contour edge 220d under stress are more predictable, thereby avoiding unpredictable local stress inflection points.

[0115] In another example, such as Figure 9 As shown, Figure 9 The diagram illustrates the case where the first profile edge 220d is an arc segment. When the first profile edge 220d is an arc, the arc essentially remains within the angular space formed by the first included angle α. Due to the continuous variation characteristics of the arc, the radius of curvature can remain approximately consistent, thereby avoiding stress inflection points and allowing stress to transition smoothly along the tangential direction, thus reducing the stress concentration factor.

[0116] In another example, such as Figure 10 As shown, Figure 10 The diagram illustrates the case where the first contour edge 220d comprises straight segments and curved segments. When the first contour edge 220d combines straight segments and curved segments—for example, a curved segment connecting a straight segment, or two curved segments connected by a straight segment—this combination not only satisfies the stress relief effect of the first included angle α but also provides greater flexibility in the design of the transition portion 22a. This allows the transition portion 22a to better adapt to the limited space inside the blank 10, thereby facilitating the structural design of the inductor component 100.

[0117] The following description will be based on the example that the first outline edge 220d and the first inner side edge 210 have the first intersection point A, the first outline edge 220d and the second inner side edge 221c have the second intersection point B, and the center line of the widened lead-out portion 22b is parallel to and close to the first inner side edge 210.

[0118] Please see also Figures 7 to 10In some embodiments, the first contour edge 220d includes a first line segment 220a and a second line segment 220b. The first line segment 220a is connected to the first side edge 21a and has the first intersection point A. The second line segment 220b is connected between the first line segment 220a and the second side edge 221a. The vertical distance L1 from the highest point of the first line segment 220a to the line connecting the first intersection point A and the second intersection point B is greater than the vertical distance L2 from the highest point of the second line segment 220b to the line connecting the first intersection point A and the second intersection point B.

[0119] Since the first segment 220a is connected to the winding portion 21, that is, the first segment 220a is the segment directly connected to the transition portion 22a from the winding portion 21, the area where the first segment 220a is located is a stress-sensitive and fragile area of ​​the transition portion 22a. That is, it is the starting point of the transition of the coil 20 from the small winding portion 21 to the thickened and widened lead portion 22b. The second segment 220b is connected to the widened lead portion 22b, that is, it is the segment connecting the transition portion 22a to the widened lead portion 22b. Therefore, by making the vertical distance from the highest point of the first line segment 220a to the line connecting the first intersection point A and the second intersection point B greater than the vertical distance from the highest point of the second line segment 220b to the line connecting the first intersection point A and the second intersection point B, the first line segment 220a can emerge from the winding portion 21 more smoothly. This provides a smooth transition in the stress-sensitive and fragile area of ​​the transition portion 22a, which helps to disperse and reduce stress concentration at this location, thereby preventing cracks from forming there. Once the stress has been effectively relieved by the first segment 220a, the transition can be accelerated as it approaches the wider lead-out portion 22b. This is because the wider lead-out portion 22b is wider and stronger, and its sensitivity to stress concentration is reduced. Therefore, it can withstand relatively rapid shape changes, thus enabling a quick transition. This minimizes the space occupied by the transition portion 22a on the winding portion 21 of the coil 20. Consequently, with the same blank body 10 size, more coil 20 turns or a wider line width can be accommodated, which is beneficial for increasing inductance or reducing DC resistance and optimizing electrical performance.

[0120] It is understandable that the first line segment 220a can be an arc segment that is concave relative to the line connecting the first intersection point A and the second intersection point B. Therefore, the maximum perpendicular distance L1 from the first line segment 220a to the line connecting the first intersection point A and the second intersection point B is located at the highest point of the arc of the first line segment 220a. That is, the first line segment 220a bulges out from the first intersection point A along the direction away from the line connecting the first intersection point A and the second intersection point B, and after reaching the highest point of the arc, its perpendicular distance from the first intersection point A and the second intersection point B gradually decreases. Since the second line segment 220b is a straight line segment, the maximum perpendicular distance L2 from the second line segment 220b to the line connecting the first intersection point A and the second intersection point B is actually located at the connection point between the second line segment 220b and the first line segment 220a.

[0121] In other embodiments, the radius of curvature of the first line segment 220a is greater than that of the second line segment 220b. That is, the direction of the first line segment 220a emerging from the winding portion 21 is gentler than that of the second line segment 220b near the widened lead-out portion 22b. In other words, the first line segment 220a is more concave in the direction away from the perpendicular line between the first intersection point A and the second intersection point B than the second line segment 220b. Therefore, in areas where stress is more sensitive and fragile (i.e., the initial portion where the coil 20 transitions from the narrower winding portion 21 to the wider lead-out portion 22b), the larger radius of curvature allows for a smoother transition of the first contour edge, effectively dispersing or reducing stress and preventing cracks from forming at this location. When approaching the robust, widened lead-out section 22b, a relatively small radius of curvature is allowed to accelerate the transition, thereby enabling a quick transition and minimizing the space occupied by the transition section 22a on the winding portion 21 of the coil 20. Consequently, with the same blank size 10, more coil 20 turns or a wider line width can be accommodated, which is beneficial for increasing inductance or reducing DC resistance and optimizing electrical performance.

[0122] Therefore, this application, by ensuring that the first included angle α is between 30° and 60°, further considers the relationship between the first line segment 220a and the second line segment 220b of the first contour edge (regardless of the change in vertical distance or radius of curvature). This non-uniform transition design achieves both stress relief and the maximum effective area of ​​the winding portion 21, which is beneficial for increasing inductance or reducing DC resistance and optimizing electrical performance.

[0123] In some embodiments, the first line segment 220a is constructed as an arc segment that is concave relative to the line connecting the first intersection point A and the second intersection point B, and the second line segment 220b is constructed as a straight line segment or an arc segment. Constructing the first line segment 220a as an arc segment that is concave relative to the line connecting the first intersection point A and the second intersection point B allows for a smoother overall transition of the transition portion 22a at the connection point with the winding portion 21, i.e., from the first intersection point A to the second intersection point B. This results in a smoother transition in the line width of the transition portion 22a, thereby avoiding sudden stress changes due to overly abrupt transitions, effectively dispersing or reducing the stress generated at this point, and allowing for more complete stress release.

[0124] The second line segment 220b is connected to the widened lead-out portion 22b. The line width of the widened lead-out portion 22b is relatively large. Therefore, the second line segment 220b is constructed as a straight line segment or an arc segment, which allows the line width of the transition portion 22a to transition faster here. This enables the transition from the winding portion 21 to the widened lead-out portion 22b to be completed quickly. This achieves effective stress release while reducing the encroachment of the transition portion 22a on the winding area of ​​the coil 20, thereby maximizing the area of ​​the winding portion 21 of the coil 20.

[0125] It is understandable that if the second line segment 220b is a straight line segment, the second line segment 220b can be located on the line connecting the first intersection point A and the second intersection point B, or the second line segment 220b can also be located on one side of the line connecting the first intersection point A and the second intersection point B, and located in the included angle space defined by the first included angle α.

[0126] It is understandable that if the second straight line is an arc segment, then the second line segment 220b can be an arc segment convex towards the line connecting the first intersection point A and the second intersection point B, and this arc segment is still located within the angular space defined by the first included angle α. Of course, as another example, the second intersection point B can be located on the tangent of this arc segment.

[0127] It can be seen that regardless of whether the second line segment 220b is a straight line segment or an arc segment, it is located in the included angle space defined by the first included angle α. This allows the direction of the contour edge 220 to be located in the included angle space defined by the first included angle α, thus making the direction of the contour edge 220 more controllable. While taking into account stress release, it can also effectively reduce the occupation of the winding area of ​​the coil 20, thereby maximizing the area of ​​the winding part 21 of the coil 20.

[0128] In some embodiments, the first contour edge 220d may further include a third line segment 220c, which connects the second line segment 220b and the second side edge 221. The third line segment 220c and the second side edge 221 have the second intersection point B, and the third line segment 220c is constructed as an arc segment protruding toward the line connecting the first intersection point A and the second intersection point B.

[0129] By defining the third segment 220c as an arc segment convex towards the line connecting the first intersection point A and the second intersection point B, combined with the aforementioned configuration of the first segment 220a and the second segment 220b—that is, the first segment 220a being an arc segment concave relative to the first intersection point A and the second intersection point B, and the second segment 220b being a straight line segment or an arc segment—the concave first arc segment allows stress to flow naturally along the first contour edge, thereby actively guiding stress away from more vulnerable and sensitive locations. In other words, the force transmitted from the winding portion 21 is not directly transmitted along the edge, but is guided to a region further inward in the transition portion 22a, thus protecting the starting end of the winding portion 21 and reducing the risk of stress concentration and fracture at that location. The widened lead-out portion 22b, due to its larger cross-sectional area and higher structural strength, does not require stress concentration prevention but rather a stable connection with the transition portion 22a. Therefore, the protruding third segment 220c (i.e., the protruding second arc segment) allows stress to smoothly extend to the widened lead-out portion 22b, preventing stress from being confined to a narrow area and enabling safer stress release. Furthermore, the protruding second arc segment ensures a reliable and stable connection with the widened lead-out portion 22b even if the transition is too rapid. The second segment 220b, whether a straight line or an arc segment, connects the first and second arc segments, allowing stress transmitted from the first arc segment to travel along a shorter path and accelerating the transition from the transition portion 22a to the widened lead-out portion 22b, thus reducing the area occupied by the transition portion 22a on the winding area of ​​the coil 20.

[0130] It is understandable that when the third line segment 220c is constructed as an arc segment protruding towards the line connecting the first intersection point A and the second intersection point B, the second line segment 220b can be a straight line segment. In this way, the contour edge 220 as a whole includes two arc segments and a straight line segment in the middle. This contour design allows the contour edge 220 to better connect the winding portion 21 and the widened lead-out portion 22b, thereby effectively realizing the transition from the winding portion 21 to the widened lead-out portion 22b. This allows for more sufficient stress release while maximizing the area of ​​the winding portion 21.

[0131] In some embodiments, when the third line segment 220c is constructed as an arc segment protruding towards the line connecting the first intersection point A and the second intersection point B, the second intersection point B may be located on the tangent of the third line segment 220c. This allows the third line segment 220c to have a smooth transition, avoiding the risk of stress concentration due to inflection points at the third line segment 220c. In other words, with the second intersection point B located on the tangent of the third line segment 220c, the third line segment 220c forms a smooth arc segment, allowing stress transmitted from the first line segment 220a and the second line segment 220b to flow smoothly along the third line segment 220c into the widened outlet portion 22b, further achieving sufficient stress release.

[0132] It is understandable that when the contour edge 220 also includes the third line segment 220c, the third line segment 220c and the second line segment 220b have an intersection point E (see...). Figure 12 ).

[0133] It is understandable that the third line segment 220c is a convex arc segment, which is basically outside the angle range determined by the first included angle α. In other words, the entire first line segment 220a and part of the second line segment 220b are within the angle range determined by the first included angle α, while the part where the second line segment 220b connects to the third line segment 220c, and the third line segment 220c itself, are outside the angle range determined by the first included angle α.

[0134] Please combine Figures 11 to 12 As shown, in some embodiments, since the first contour edge 220d is connected to the first inner side edge 210 and the second inner side edge 221c, and the center line of the widened lead-out portion 22b is closer to the first inner side edge 210, the first contour edge 220d includes a first line segment 220a, a second line segment 220b, and a third line segment 220c. The first line segment 220a is constructed as an arc segment that is concave relative to the line connecting the first intersection point A and the second intersection point B. The third line segment 220c is constructed as an arc segment that is convex relative to the first line segment 220a. The second line segment 220b is connected between the first line segment 220a and the third line segment 220c. The second line segment 220b can be a straight line segment, and the radius of curvature of the first line segment 220a is greater than the radius of curvature of the third line segment 220c. Correspondingly, the second contour edge 220e includes a fourth line segment 2201 and a fifth line segment 2202 connected to the fourth line segment 2201. The connection between the fourth line segment 2201 and the first outer edge 211 defines a fourth intersection point D. The connection between the fifth line segment 2202 and the second outer edge 221b defines a third intersection point C. The fourth line segment 2201 is constructed as an arc segment that is concave relative to the line connecting the third intersection point C and the fourth intersection point D. The fifth line segment 2202 is constructed as an arc segment that is convex relative to the fourth line segment 2201. The radius of curvature of the fourth line segment 2201 is greater than the radius of curvature of the fifth line segment 2202.

[0135] In other words, the first contour edge 220d uses a straight line connecting two arcs, while the second contour edge 220e uses two arcs directly connected. This is because the first contour edge 220d is the main path for stress guidance and concentration. Therefore, it adopts a three-segment design (including a recessed first line segment 220a, a convex third line segment 220c, and a second line segment 220b connecting the first line segment 220a and the third line segment 220c). This provides a gradual transition and release path for the stress from the winding portion 21 to the widened lead-out portion 22b. The second contour edge 220e, which is in the non-load-bearing path, adopts a two-segment design (including a recessed fourth segment 2201 and a convex fifth segment 2202). That is, a concave arc segment with a larger radius of curvature is used at the starting end connected to the winding part 21, which makes the line width transition smoother. At the end connected to the widened lead-out part 22b, a convex arc segment with a larger radius of curvature is used, which makes the transition converge quickly and completes the transition from point D to point C. This makes the transition path from the winding part 21 to the widened lead-out part 22b shorter, which helps to reduce the occupation of the outer space of the winding part 21.

[0136] Therefore, by adopting different designs for the inner and outer contour edges of the transition section 22a, the strain energy distribution on the inner and outer sides of the inductor component 100 can be made more reasonable, avoiding local transition deformation, while also maximizing space utilization.

[0137] Of course, in other embodiments, the second contour edge 220e may also adopt, for example, a three-segment design, which can be adjusted according to the actual situation. This embodiment does not make specific limitations on this.

[0138] In some embodiments, the line connecting the third intersection point C and the fourth intersection point D forms a second included angle β with the first perpendicular line P, and the second included angle β satisfies 90°-180°. Since the first contour edge 220d is connected to the first inner side edge 210 and the second inner side edge 221c, and the vertical distance between the first intersection point A and the second intersection point B is greater than or equal to a preset distance, the first included angle α is the stress transition part between the winding part 21 and the widened lead-out part 22b. That is, the position where the first included angle α is located is the position where the stress is most concentrated. Therefore, when the first included angle α is limited to 30°-60°, a relatively gentle stress flow channel can be provided between the winding part 21 and the widened lead-out part 22b, thereby guiding and dispersing the stress from the winding part 21 to the widened lead-out part 22b, and realizing effective stress release.

[0139] The second included angle β is located on the non-load-bearing side of the inductor component 100. When it is between 90° and 180°, it can shorten the transition path from the winding portion 21 to the widened lead portion 22b, so that the winding portion 21 can quickly transition to the widened lead portion 22b. This reduces the space occupied by the transition portion 22a around the winding portion 21, thereby improving the space utilization of the inductor component 100.

[0140] In some embodiments, as described above, the second outer edge 221d can be located on the top surface 16 of the blank 10, and therefore, the third intersection point C can be located on the top surface 16. The second intersection point B is located inside the blank 10. Thus, the outer edge of the widened lead-out portion 22b is located on the top surface 16 of the blank 10. This facilitates direct connection between the widened lead-out portion 22b and the external electrode 30, shortening the connection path and reducing connection resistance. Furthermore, the widened lead-out portion 22b utilizes the space of the outer edge of the winding portion 21, thereby increasing the width of the widened lead-out portion 22b while reducing its occupation of the winding area of ​​the coil 20. Of course, in other embodiments, the third intersection point C may not be located on the top surface 16, but may be recessed towards the bottom surface 15.

[0141] The following is a simulation of the thermal stress distribution of the inductor component 100 using this application.

[0142] Please refer to Table 1 below, which shows the maximum values ​​of the thermal stress distribution under different values ​​of the first included angle.

[0143] Table 1

[0144] Combination Figure 13 and Figure 14 As shown, when the first included angle α is within the range of 30°-60°, the maximum value of the thermal stress distribution of the inductor component 100 is less than 0.216 GPa, which is sufficient to achieve stress relief. If the first included angle α exceeds 60°, the maximum value of the thermal stress distribution increases linearly. Although stress relief can be achieved, the larger the angle, the larger the effective pattern area of ​​the winding portion 21 occupied by the transition portion 22a, which is not conducive to maximizing the area of ​​the winding portion 21 and improving the inductance performance of the inductor component 100.

[0145] Please see Figure 15 This application also discloses an electronic device 200, including the inductor component 100 as described above. It is understood that the electronic device 200 may include, but is not limited to, mobile phones, laptops, tablets, handheld game consoles, etc.

[0146] The inductor components and electronic devices disclosed in the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the inductor components and electronic devices of this application and their core ideas. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. An inductor component, characterized in that, include: blank; A coil is disposed in the blank body. The coil includes a winding portion and two lead-out portions, both of which are connected to the winding portion. Along the linewidth direction of the winding portion, the width of the lead-out portions is greater than the width of the winding portion. The blank body has two first surfaces along the linewidth direction. Two external electrodes are disposed on the blank, and the two external electrodes are respectively electrically connected to the corresponding lead-out portions; In the projection plane along the thickness direction of the blank, the center line of the winding portion along the line width direction and the center line of the lead-out portion along the line width direction are spaced apart in the line width direction, so that the lead-out portion is eccentrically positioned relative to the winding portion. Along the line width direction, the winding portion has two opposing first sides, and the lead-out portion has two opposing second sides. The two second sides are respectively positioned opposite the two first sides. The vertical distance from one first side to its opposing second side is h1, and the vertical distance from the other first side to its opposing second side is h2. Where h1 and h2 are both non-zero, and h1 and h2 are not equal; One of the second sides of the lead-out portion is located on the first surface opposite to it. The length of one of the second sides on the first surface is La. The other second side has a distance from the first surface opposite to it. Along the first direction, the length of the second side is Lb, where Lb is less than La. The first direction is a direction perpendicular to the line width direction.

2. The inductor component according to claim 1, characterized in that, The blank also has two end faces along the first direction, the two external electrodes are respectively disposed on the two end faces, the two second sides are respectively disposed opposite to the two first surfaces, and the distance from one of the second sides to the first surface opposite to it is not equal to the distance from the other second side to the first surface opposite to it.

3. The inductor component according to claim 2, characterized in that, The maximum width of the blank along the linewidth direction is W, and the maximum width of the lead-out portion along the linewidth direction is H, satisfying: H = 0.3W~0.5W, and / or, The length of the blank along the first direction is L0, and the length of the second side on the first surface is La, where 0.05L0≤La≤0.3L0.

4. The inductor component according to any one of claims 1-3, characterized in that, The two first sides are respectively a first inner side and a first outer side, and the two second sides are respectively a second inner side and a second outer side. The first inner side is configured to form part of the graphic space enclosed by the winding portion on the blank. Along the line width direction, when the center line of the lead-out portion is parallel to and close to the first inner side, h1 is greater than h2; When the centerline of the lead-out portion is parallel to and close to the first outer side along the line width direction, h2 > h1.

5. The inductor component according to claim 4, characterized in that, The line width of the wound portion is W0. When h1 > h2, the following conditions must be met: h1 = W0 ~ 2W0, h2 = 0.5 W0 ~ 0.95W0; When h2 > h1, the following conditions must be met: h2 = W0 ~ 2W0, h1 = 0.5 W0 ~ 0.95W0.

6. The inductor component according to claim 4, characterized in that, At least one of the lead-out portions includes a transition portion and a widened lead-out portion, the transition portion being configured to connect the winding portion and the widened lead-out portion such that the width of the coil increases from the winding portion toward the widened lead-out portion; In the projection plane along the thickness direction of the blank, the transition portion includes a first profile edge and a second profile edge along the line width direction, the widened lead-out portion has a second side edge, the first profile edge is connected to one of the first side edges and one of the second side edges, and the second profile edge is connected to another first side edge and another second side edge. The first contour edge has a first intersection point with one of the first side edges and a second intersection point with one of the second side edges; the second contour edge has a fourth intersection point with the other first side edge and a third intersection point with the other second side edge. The first perpendicular line is a line passing through the second intersection point and the third intersection point and perpendicular to the first side. The vertical distance between the first intersection point and the second intersection point on the first perpendicular line is h1, and the vertical distance between the third intersection point and the fourth intersection point on the first perpendicular line is h2.

7. The inductor component according to claim 6, characterized in that, Along the length of the wound portion, the distance from the first intersection point to the second intersection point is d1, and the distance from the third intersection point to the fourth intersection point is d2, where d1 > d2.

8. The inductor component according to claim 7, characterized in that, The width of the wound portion is W0, satisfying: d1=1.5W0~2.2W0, d2=0.7W0~1.2W0.

9. The inductor component according to claim 6, characterized in that, When the centerline of the widened lead-out portion is parallel to and close to the first inner side, and h1 is greater than or equal to a preset distance, the line connecting the first intersection point and the second intersection point forms a first angle α with the first perpendicular line. When the centerline of the widened lead-out portion is parallel to and close to the first outer side and h2 is greater than or equal to a preset distance, the line connecting the third intersection point and the fourth intersection point forms a first angle α with the first perpendicular line; Wherein, the first included angle α satisfies 30°-60°.

10. The inductor component according to claim 6, characterized in that, The distance between the centerline of the wound portion along the line width direction and the centerline of the widened lead-out portion along the line width direction is T, and the line width of the wound portion is W0, satisfying: T = 0.25W0 ~ 0.55W0.

11. An electronic device, characterized in that, Includes the inductor component as described in any one of claims 1-10.

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