Coil component and inductance element

Abstract

The inductance element comprises the coil assembly, the coil assembly comprises an insulating main body and a coil arranged in the insulating main body, a first conductive part and a second conductive part which are arranged in a spaced mode in the first direction are arranged in the insulating main body, and the overlook plane where the winding direction of the coil is located is perpendicular to the first direction; the orthographic projection of the coil on the overlook plane is roughly a rectangular ring, and the coil is arranged between the first conductive part and the second conductive part and electrically connected in sequence. Wherein the rectangular ring is provided with an inner contour line and an outer contour line which are opposite to each other, the orthographic projection of the first conductive part on the overlook plane is an inscribed circle tangent to any two adjacent edges of the outer contour line, and the orthographic projection of the second conductive part on the overlook plane is located in the inner contour line. The single-layer coil of the coil assembly has a large inductance value and a high quality factor, so that the inductance element has the large inductance value and the high quality factor at the same time.

Description

Technical Field

[0001] The present application relates to the technical field of inductor components, and in particular to a coil assembly and an inductor component. Background Art

[0002] An inductor element generally includes an insulating body, internal electrodes (such as coil electrodes and conductive portions electrically connecting different coil electrodes) disposed inside the insulating body, and external electrodes electrically connected to external devices.

[0003] As the integration of electronic devices becomes higher and higher, the size of inductance components is getting smaller and smaller, and the inductance of inductance components is also decreasing. Generally, in order to maintain or improve the performance of inductance components while reducing the size of inductance components, the number of coils of inductance components can be increased to increase the inductance, but this will lead to a decrease in the quality factor of the inductance component and increase the volume and weight of the inductance component. Although reducing the number of coils can effectively improve the quality factor of the inductance component, it will reduce the inductance of the inductance component. Therefore, there is an urgent need in the art for an inductance component with both a large inductance and a high quality factor. Summary of the invention

[0004] The present application discloses a coil assembly and an inductor element, which enable a single-layer coil to have a larger inductance value and a higher quality factor, and enable the inductor element to have both a larger inductance and a higher quality factor.

[0005] In a first aspect, the present application discloses a coil assembly, comprising:

[0006] An insulating body, wherein a first conductive part and a second conductive part are arranged at intervals along a first direction; a coil is arranged in the body, a top-view plane in which the winding direction of the coil is located is perpendicular to the first direction, and the orthographic projection of the coil on the top-view plane is roughly a rectangular ring; the coil is arranged between the first conductive part and the second conductive part and is electrically connected in sequence; wherein the rectangular ring has a relative inner contour line and an outer contour line, the orthographic projection of the first conductive part on the top-view plane is an inscribed circle tangent to any two adjacent sides of the outer contour line, and the orthographic projection of the second conductive part on the top-view plane is located inside the inner contour line.

[0007] In a possible implementation, the orthographic projection of the second conductive portion on the top-view plane is an offline circle with a radius of r, the inner contour line includes a preset area, the center of the offline circle is located in the preset area, and the minimum distance between the boundary of the offline circle and the inner contour line is a; the radius of the inscribed circle is r, and the minimum distance between the boundary of the inscribed circle and the boundary of the preset area is a+r.

[0008] In a possible implementation, the inner contour line has a first inner edge and a second inner edge that are arranged in parallel and extend along the second direction, and a third inner edge and a fourth inner edge that are arranged in parallel and extend along the third direction, and the first inner edge, the third inner edge, the second inner edge and the fourth inner edge are connected end to end in sequence; the preset area has a first boundary line and a second boundary line that are arranged in parallel and extend along the second direction, the first boundary line is located between the first inner edge and the second boundary line, the distance between the first boundary line and the first inner edge is a+r, and the distance between the second boundary line and the second inner edge is a+r; wherein the first direction, the second direction and the third direction are perpendicular to each other.

[0009] In a possible implementation, the outer contour line has a first outer edge and a second outer edge arranged in parallel and extending along the second direction, and a third outer edge and a fourth outer edge arranged in parallel and extending along the third direction, the first outer edge, the third outer edge, the second outer edge and the fourth outer edge are connected end to end in sequence; the inscribed circle is tangent to the first outer edge and the third outer edge; the preset area also has a second boundary line and a fourth boundary line arranged in parallel and extending along the third direction, the second boundary line is located between the second inner edge and the fourth boundary line, the distance between the second boundary line and the second inner edge is a+r, and the distance between the fourth boundary line and the second inner edge is 5a+r.

[0010] In a possible implementation, the straight line where the first boundary line, the straight line where the second boundary line, the straight line where the third boundary line and the straight line where the fourth boundary line are located define a rectangular area, and concentric circles with a radius a+2r and a center at the center of the inscribed circle intersect with the rectangular area, and the area outside the intersection of the rectangular area and the concentric circles is the preset area.

[0011] In a possible implementation manner, the distance between the third boundary line and the fourth boundary line is a to 4a.

[0012] In a possible implementation manner, the center of the inscribed circle is located at the intersection of the first inner edge and the second inner edge.

[0013] In a possible implementation manner, the minimum distance a between the boundary of the offline circle and the inner contour line satisfies: a≥12 μm, and the radius r of the inscribed circle satisfies: 12 μm≤r≤30 μm.

[0014] In a possible implementation, there are multiple first conductive parts and multiple second conductive parts, the coil includes multiple coil electrodes stacked along the first direction, and the coil electrodes are provided between the first conductive parts and the second conductive parts adjacent to each other along the first direction and are electrically connected in sequence.

[0015] In a second aspect, the present application discloses an inductor element, comprising two oppositely disposed external electrodes and any one of the above-mentioned coil assemblies, wherein the two external electrodes are disposed on the insulating body and are electrically connected to the two lead electrodes of the coil assembly in a one-to-one correspondence.

[0016] Compared with the prior art, this application has at least the following beneficial effects:

[0017] The coil assembly disclosed in the present application is configured by setting the position of the circle formed by the orthographic projection of the first conductive part in the coil winding direction on the orthographic projection of the coil, and inscribed with any two adjacent sides of the outer contour line of the rectangular ring formed by the orthographic projection of the coil, and setting the position of the orthographic projection of the second conductive part inside the inner contour line of the orthographic projection of the coil. Thus, the position of the coil relative to the first conductive part and the second conductive part can be reasonably set, and the shape of the coil can be appropriately specified. At the same time, the appropriate position between the first conductive part and the second conductive part can enable a single-layer coil to have a relatively large inductance value and a high quality factor. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solution in the application of the present invention, the drawings required for use in the application will be briefly introduced below. Obviously, the drawings described below are only some applications of the present invention. For ordinary technicians in this technical field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 is a schematic diagram of the three-dimensional structure of the coil assembly of an embodiment of the present application;

[0020] Figure 2 yes Figure 1 A schematic cross-sectional view of the coil assembly along line AA';

[0021] Figure 3 is a schematic diagram of the orthographic projection of the coil and the first and second conductive parts of the embodiment of the present application on a top-view plane;

[0022] Figure 4 It is a schematic diagram of the relative position of the preset area and the inner contour line of the coil orthographic projection of the embodiment of the present application;

[0023] Figure 5 is a schematic diagram of the relative positions of the coil and the first and second conductive parts of an embodiment of the present application;

[0024] Figure 6 is a schematic diagram of the layered structure of the coil assembly of an embodiment of the present application;

[0025] Figure 7 is a schematic diagram of the three-dimensional structure of the inductor element of the embodiment of the present application;

[0026] Figure 8 yes Figure 7 Schematic diagram of the cross section of the inductor element along line BB'. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0028] In this application, the directions or positional relationships indicated by the terms "upper", "inner", "outer", "middle", etc. are based on the directions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific direction, or to be constructed and operated in a specific direction.

[0029] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0030] In addition, the terms "provided with" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0031] In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0032] In small inductor components, since the size of the inductor components is already very small (millimeter level), the overall inductance value of the small inductor components is also very small. Therefore, a single small inductor component is usually difficult to meet actual usage requirements, and the inductance value needs to be increased by increasing the number of inductor components.

[0033] In order to solve the problem of small inductance of a single small inductor, it is generally achieved by increasing the number of turns of the coil inside the inductor. At the same time, in order to maintain the volume of the inductor or minimize the increase in volume, the wire diameter / width of the coil will be reduced to arrange more coils in a limited space, thereby increasing the inductance of a single-layer coil. However, reducing the wire diameter of the coil will lead to a decrease in the overcurrent value, which will limit the application scenarios of the inductor. In addition, when the number of turns of the coil increases, the quality factor of the coil decreases due to the influence of the coil density, which will also affect the performance of the inductor.

[0034] In order to obtain the best balance between the inductance and quality factor of the inductor, it is generally achieved by optimizing the number of turns and wire diameter of the coil. However, inductors have different shapes and sizes in different application scenarios. To meet these needs, the coils need to be properly optimized for different application scenarios. In addition, with the continuous evolution of electronic devices and electronic equipment, inductors also need to make adaptive adjustments. The existing solutions are not universal, and the optimization is difficult and the process is complicated, which cannot adapt to the current and future development needs.

[0035] In order to solve the above technical problems, the present application discloses a coil assembly, which enables a single-layer coil to have a larger effective inductance value and a higher quality factor, so that the inductor element having the coil assembly has a larger inductance and a higher quality factor.

[0036] Please also read Figures 1 to 5 ,in, Figure 1 is a schematic diagram of the three-dimensional structure of the coil assembly 100 in the embodiment of the present application, Figure 2 yes Figure 1 A schematic cross-sectional view of the coil assembly 100 along line AA', Figure 3 1 is a schematic diagram of the orthographic projection of the coil 120, the first conductive portion 111 and the second conductive portion 112 of the embodiment of the present application on the top view plane P. Figure 4 is a schematic diagram of the relative position of the preset area and the inner contour line of the coil orthographic projection in the embodiment of the present application, Figure 5 It is a schematic diagram of the relative positions of the coil 120, the first conductive portion 111 and the second conductive portion 112 in the embodiment of the present application.

[0037] In the first aspect, an embodiment of the present application provides a coil assembly 100, which can be applied to an inductor element. Specifically, the coil assembly 100 includes an insulating body 110 and a coil 120. Among them, a first conductive portion 111 and a second conductive portion 112 are arranged inside the insulating body 110 and are arranged at intervals along a first direction X. The coil 120 is arranged inside the insulating body 110, and the plane where the winding direction of the coil 120 is located is a top-view plane P. The orthographic projection of the coil 120 on the top-view plane P is roughly a rectangular ring L, and the top-view plane P is perpendicular to the first direction X. In addition, the coil 120 is arranged between the first conductive portion 111 and the second conductive portion 112, and the first conductive portion 111, the coil 120 and the second conductive portion 112 are electrically connected in sequence.

[0038] In some embodiments, the rectangular ring L has an inner contour line L1 and an outer contour line L2 that are relatively set, and the orthographic projection of the first conductive portion 111 on the top-view plane P is an inscribed circle O1 tangent to any two adjacent sides of the outer contour line L2, and the orthographic projection of the second conductive portion on the top-view plane P is located inside the inner contour line L1.

[0039] The above arrangement takes into account the design schemes of single-turn electrodes and multi-turn electrodes in the inductor element, can reasonably set the position of the coil 120 relative to the first conductive portion 111 and the second conductive portion 112, and appropriately stipulate the shape of the coil, and limit the relative position of the first conductive portion 111 and the second conductive portion 112 to a certain extent. Even if a single-layer coil is used, it can have a larger inductance value and a higher quality factor, thereby making the inductor element have both a larger inductance and a higher quality factor.

[0040] In some embodiments, the first conductive portion 111 and the second conductive portion 112 are conductive through holes disposed inside the insulating body 110, which are usually circular through holes, and conductive materials are deposited or plated on the inner wall of the circular through holes to achieve electrical connection with the coil 120. It is understood that the shape of the conductive through hole is not limited to a circle, and it can also be a polygon, an ellipse, an oval, etc., which can be selected according to actual needs.

[0041] In the present application, the coil 120 may be a single-turn coil, a multi-turn coil, or a setting between a single-turn coil and a two-turn coil. This embodiment is described using a single-turn coil as an example, but is not limited thereto.

[0042] In some embodiments, the insulating body 110 can be made of ceramic or other insulating materials that meet the requirements to provide the coil assembly 100 with appropriate mechanical properties and good insulation properties. At the same time, it can also be designed into a specific shape according to actual needs, such as a hexahedron, a cylinder, a prism or other shapes. This embodiment is illustrated using a hexahedron as an example, but is not limited to this.

[0043] In some embodiments, the first conductive portion 111, the second conductive portion 112 and the coil 120 are all made of conductive materials, such as gold, silver, copper and other materials with good conductivity, which can avoid the situation where the overall resistance value of the inductor element is too large and affects the performance of the inductor element.

[0044] It should be noted that in the present application, the meaning of "the orthographic projection of the coil 120 on the top-view plane P is roughly a rectangular ring" is: the orthographic projection of the coil 120 on the top-view plane P can be a strict rectangular ring, or it can be a shape close to or similar to a rectangular ring. For example, at least one of the four corners of the outer contour line of the rectangular ring, and / or at least one of the four corners of the inner contour line is set to a chamfer (such as an oblique chamfer or a rounded chamfer), or, any one or more sides of the rectangular ring are set to a shape that is appropriately bent / bent in the orthographic projection on the top-view plane.

[0045] See again Figure 3 In some embodiments, the orthographic projection of the second conductive portion 112 on the top view plane P is an offline circle O2, whose radius is r, and the offline circle O2 is located inside the inner contour line L1, that is, the offline circle O2 is located in the area defined by the inner contour line L1 and is separated from the inner contour line L1. It should be noted that the "offline circle" here means that the offline circle O2 and the inner contour line L1 are separated from each other, and there is no intersection between the two.

[0046] In some embodiments, the inner contour line L1 includes a preset area A, the center of the offline circle O2 is located in the preset area A, and the minimum distance between the boundary of the offline circle O2 and the inner contour line L1 is a. It can be understood that there are corresponding distances between the four sides of the offline circle O2 and the inner contour line L1, that is, there are four distance values, among which the smallest value is a.

[0047] In some embodiments, the radius of the inscribed circle O1 is the same as the radius of the offline circle O2, and the minimum distance between the boundary of the inscribed circle O1 and the boundary of the preset area A is a+r. It can be understood that the "distance between the boundary of the inscribed circle O1 and the boundary of the preset area A" here is the minimum distance between the two.

[0048] In this way, the distance between the first conductive portion 111 and the second conductive portion 112 is appropriately limited, which can avoid the situation where the capacitance formed between the first conductive portion 111 and the second conductive portion 112 is too large and affects the performance of the inductor element.

[0049] It should be noted that the inscribed circle O1 may also be set at other positions and be tangent to other adjacent sides of the outer contour line L2.

[0050] See again Figure 3 and Figure 4In some embodiments, the four sides of the inner contour line L1 include: a first inner side L11 and a third inner side L13 arranged in parallel and extending along the second direction Y, and a second inner side L12 and a fourth inner side L14 arranged in parallel and extending along the third direction Z. The first inner side L11, the second inner side L12, the third inner side L13 and the fourth inner side L14 are connected end to end in sequence to form a substantially rectangular contour line. The first direction X, the second direction Y and the third direction Z are perpendicular to each other.

[0051] Optionally, the distance between the boundary of the offline circle O2 and the third inner edge L13 is smaller than the distance between the boundary of the offline circle O2 and other inner edges, and therefore, the distance between the boundary of the offline circle O2 and the third inner edge L13 is the minimum distance a. Of course, in other examples, the distance between the offline circle O2 and the first inner edge L11 is the minimum distance a, or the distance between the offline circle O2 and the second inner edge L12 is the minimum distance a, or the distance between the offline circle O2 and the fourth inner edge L14 is the minimum distance a.

[0052] Correspondingly, the outer contour line L2 has a first outer edge L21 and a second outer edge L23 which are arranged in parallel and extend along the second direction Y, and a second outer edge L22 and a fourth outer edge L24 which are arranged in parallel and extend along the third direction Z. The first outer edge L21, the second outer edge L22, the third outer edge L23 and the fourth outer edge L24 are connected end to end in sequence to form a substantially rectangular contour line.

[0053] In an exemplary embodiment, the inscribed circle O1 is tangent to the first outer edge L21 and the second outer edge L22. Of course, as other examples, the inscribed circle O1 may also be tangent to other outer edges, for example, the inscribed circle O1 may also be tangent to the second outer edge L22 and the third outer edge L23, or to the third outer edge L23 and the fourth outer edge L24, or to the first outer edge L21 and the fourth outer edge L24.

[0054] Optionally, as can be seen from the foregoing, the radius of the inscribed circle O1 is r, and the distance between the center of the inscribed circle O1 and the preset area A is a+2r.

[0055] In some embodiments, the preset area A has a first boundary line A1 and a third boundary line A3 that are arranged in parallel and extend along the second direction Y. The distance between the first boundary line A1 and the first inner side L11 is a+r, and the distance between the third boundary line A3 and the third inner side L13 is a+r. In this way, the setting range of the preset area A in the second direction Y can be appropriately limited, and the distance between the first conductive part 111 and the second conductive part 112 can be avoided from being too large, thereby preventing the size / volume of the coil component 100 from being too large.

[0056] In other embodiments, when the inscribed circle O1 is tangent to other sides of the outer contour line L2, since the distance between the preset area A and the inscribed circle O1 is a+r, the position of the preset area A relative to the inner contour line L1 will also change. For example, when the inscribed circle O1 is tangent to the first outer edge L21 and the fourth outer edge L24, the position of the preset area A will adaptively shift toward the fourth outer edge L24 relative to the position when the inscribed circle O1 is tangent to the first outer edge L21 and the second outer edge L22.

[0057] In some embodiments, the preset area A also has a second boundary line A2 and a fourth boundary line A4 that are arranged in parallel and extend along the third direction Z, and the second boundary line A2 is located between the second inner side L12 and the fourth boundary line A4. Among them, the distance between the second boundary line A2 and the second inner side L12 is a+r, and the distance between the fourth boundary line A4 and the second inner side L14 is 5a+r. In this way, the setting range of the preset area A in the third direction Z can be appropriately limited, and the distance between the first conductive part 111 and the second conductive part 112 can be avoided to be too large, so as to prevent the size / volume of the coil component 100 from increasing. Secondly, according to the positional relationship between the first conductive part 111 and the second conductive part 112, the positions of the two connection points of the coil 120 can be appropriately designed. As long as the two connection points of the coil 120 can meet the above definition, it can ensure that the two connection points are effectively electrically connected to the first and second conductive parts respectively, and the shape of the coil 120 is preliminarily determined.

[0058] See again Figure 4 In some embodiments, the straight line where the first boundary line A1 is located, the straight line where the second boundary line A2 is located, the straight line where the third boundary line A3 is located, and the straight line where the fourth boundary line A4 is located define a rectangular area B, and the concentric circle O1' with the center of the inscribed circle O1 as the center and a radius of 2a+r intersects with the rectangular area B, and the intersection area is C, then, the area outside the intersection area of ​​the rectangular area B and the concentric circle O1' is the preset area A. In this way, the position of the orthographic projection of the second conductive part 112 on the top view plane P relative to the first conductive part 111 and the coil 120 can be reasonably defined, so that the single-layer coil 120 has a relatively large effective inductance value and a high quality factor. In addition, it can also avoid that the distance between the off-line circle O2 and the inscribed circle O1 is too close, resulting in excessive capacitance between the first conductive part 111 and the second conductive part 112, thereby affecting the performance of the inductor element.

[0059] In some embodiments, the distance between the third boundary line A3 and the fourth boundary line A4 is a-4a. In this way, the range of the preset area A in the second direction is more specifically defined, which is conducive to more specifically setting the position of the second conductive part 112 relative to the first conductive part 111 and the coil 120.

[0060] Exemplarily, when the distance between the third boundary line A3 and the fourth boundary line A4 is a, the setting range of the offline circle O2 is relatively determined, which is conducive to the targeted design and processing of the mask according to the position of the second conductive part 112. When the distance between the third boundary line A3 and the fourth boundary line A4 is greater than a and does not exceed 3a, the setting range of the second conductive part 112 is relatively large, and it is relatively flexible to determine the position of the second conductive part 112, and it can be appropriately adjusted according to actual conditions. When the distance between the third boundary line A3 and the fourth boundary line A4 is 4a, the specific position of the second conductive part 112 can be flexibly set.

[0061] In this embodiment, the center of the inscribed circle O1 is located at the intersection of the first inner side L11 and the second inner side L12. In this way, when manufacturing the coil assembly 120, if the first conductive part 111 and the second conductive part 112 are manufactured first, the position of the connection point of the coil 120 can be determined by the position of the first conductive part 111 and the second conductive part 112. In some cases, it can also be used to determine the shape of the coil 120, thereby reducing the difficulty of designing and manufacturing the coil assembly 120. Alternatively, in the case of manufacturing the coil 120 first, the position of the first conductive part 111 and the second conductive part 112 can also be determined by the coil 120, which can also reduce the difficulty of designing and manufacturing the coil assembly 120.

[0062] In some embodiments, the minimum distance a between the boundary of the offline circle O2 and the inner contour line L1 satisfies: a≥12 μm, and the radius r of the inscribed circle O1 satisfies: 12 μm≤r≤30 μm.

[0063] Exemplarily, the minimum distance a between the boundary of the offline circle O2 and the inner contour line L1 is 12 μm. At this time, the distance between the inscribed circle O1 and the offline circle O2 is small, that is, the distance between the first conductive part 111 and the second conductive part 112 is small, which is conducive to the miniaturization design of the coil component 100. When the minimum distance a between the boundary of the offline circle O2 and the inner contour line L1 is 14 μm-20 μm, for example, a is 14 μm, 16 μm, 18 μm or 20 μm, the distance between the first conductive part 111 and the second conductive part 112 can be appropriately increased, thereby reducing the capacitance value between the first conductive part 111 and the second conductive part 112, while meeting the requirements of the miniaturization design of the coil component 100. When the minimum distance a between the boundary of the offline circle O2 and the inner contour line L1 is greater than 20 μm, for example, a is 22 μm, 24 μm, 28 μm or other sizes, the capacitance value between the first conductive part 111 and the second conductive part 112 can be effectively reduced.

[0064] In some embodiments, the radius r of the inscribed circle O1 is 12 μm, and the radius of the first conductive part 111 and the second conductive part 112 is small, so that the distance between the two is large, which can meet the requirements of miniaturized design of the coil component 100 and ensure that the capacitance between the first conductive part 111 and the second conductive part 112 is small. When the radius of the inscribed circle O1 is 12 μm<r≤20 μm, for example, r is 14 μm, 16 μm, 18 μm or 20 μm, appropriately increasing the size of the first conductive part 111 and the second conductive part 112 is conducive to increasing the current that can pass through the coil component 100, improving the performance of the coil component 100, and balancing the requirements of miniaturized design and low capacitance. When the radius of the inscribed circle O1 is 20 μm<r≤30 μm, for example, r is 22 μm, 24 μm, 28 μm or other sizes, further increasing the size of the first conductive part 111 and the second conductive part 112 is conducive to increasing the current that can pass through the coil component 100.

[0065] In some embodiments, there are multiple first conductive parts 111 and second conductive parts 112, which are alternately arranged along the first direction X, and the coil 120 includes multiple coil electrodes 121 stacked along the first direction X, and any two adjacent coil electrodes 120 are separated by the insulating body 110. In the first direction X, a coil electrode 121 is arranged between adjacent first conductive parts 111 and second conductive parts 112, and the first conductive parts 111, the coil electrodes 121 and the second conductive parts 112 are electrically connected in sequence.

[0066] See again Figure 5 The coil electrode 121 may include a main body 121a and an extension 121b connected to each other. The orthographic projections of the main bodies 121a of the plurality of coil electrodes 121 on the top-view plane P form the rectangular ring L, and the orthographic projections of the extensions 121b on the top-view plane P protrude from the rectangular ring L. The main bodies 121a of any two adjacent coil electrodes 121 are electrically connected through the first conductive portion 111, and the extensions 121b of the two are electrically connected through the second conductive portion 112.

[0067] See again Figure 2 In some embodiments, the coil assembly 100 further includes two extraction electrodes 130 disposed inside the insulating body 110, and the two extraction electrodes 130 are respectively disposed on opposite sides of the coil 120 along the first direction X. The two extraction electrodes 130 each have an opposite first end and a second end, the first ends of the two extraction electrodes 130 are both electrically connected to the plurality of coil electrodes 121, and the second ends of the two extraction electrodes 130 each pass through the insulating body 110 and are respectively located on opposite sides of the insulating body 110. The two extraction electrodes 130 are used to electrically connect to external electrodes.

[0068] Specifically, a first end of one lead-out electrode 130 may be electrically connected to the coil electrode 121 via a first conductive portion 111 , and a first end of another lead-out electrode 130 may be electrically connected to the coil electrode 121 via a second conductive portion 112 .

[0069] In some embodiments, the outer surface of the insulating body 110 may be provided with a protective layer (not shown), which can prevent the insulating body 110 from being damaged by unexpected factors, further improving the stability of the coil assembly 100. It is understood that the protective layer is generally made of an insulating material, such as a polymer film.

[0070] See also Figure 6 , Figure 6 is a schematic diagram of the layered structure of the coil component 100 of the embodiment of the present application. The coil component 100 can be manufactured by photolithography, as follows:

[0071] First, a conductive coating is coated / printed on the substrate, and then a mask is used for exposure and development to obtain a coil electrode 121 that meets the above description.

[0072] Then, a layer of ceramic material is printed on the coil electrode 121, such as Figure 6 As shown in the dotted frame, a conductive through hole is obtained by exposure and development;

[0073] Repeat the above steps to obtain coil electrodes 121 with a preset number of layers, and then use a cutter to cut and separate them into pieces;

[0074] The singulated products are heated to 465°C in an air atmosphere to perform a debonding process;

[0075] Thereafter, the temperature is heated to 900° C. and sintered to obtain the coil assembly 100 .

[0076] It should be noted that, by using the above-mentioned manufacturing method, the insulating body 110 is formed layer by layer, and each insulating layer is provided with a first conductive portion 111 or a second conductive portion 112 .

[0077] It can be understood that, through the above arrangement, the two connection points of the coil 120 correspond to the first conductive part 111 and the second conductive part 112, ensuring that the coil 120 can be effectively electrically connected to the first conductive part 111 and the second conductive part 112. Therefore, when the coil 120 is configured to have multiple layers of coil electrodes 121, the shapes of the coil electrodes 121 of different layers can be configured to be the same, or two different shapes of coil electrodes 121 are alternately configured along the first direction X. In this way, when manufacturing the coil component 100 having multiple layers of coil electrodes 121, the mask plate used to form the coil electrode 121 can be reused, thereby improving the utilization rate of the mask plate, and there is no need to separately set different mask plates for different layers of coils, thereby reducing the mold opening cost, and effectively reducing the cost of manufacturing the coil component 100. Moreover, when the number of layers of the coil electrode 121 along the first direction X is more, the part of the reduction in its manufacturing cost will be more significant compared with the existing solution.

[0078] See also Figure 7 and Figure 8 ,in, Figure 7 is a schematic diagram of the three-dimensional structure of the inductor element 200 provided in an embodiment of the present application, Figure 8 yes Figure 7 The cross-sectional schematic diagram of the inductor element 200 along the BB' line is shown. In the second aspect, the embodiment of the present application provides an inductor element 200, the inductor element 200 includes two external electrodes 210 arranged opposite to each other, and the coil component 100 as described above, the two external electrodes 210 are arranged on the insulating body 110, and are electrically connected to the two lead-out electrodes 130 of the coil component 100. The two external electrodes 210 can be used to electrically connect external devices so that the inductor element 200 is applied to the circuit.

[0079] In this embodiment, the external electrode 210 is a composite electrode, including three different conductive layers: a silver metal layer, a nickel metal layer and a tin metal layer. Among them, the nickel metal layer can be a plating layer, which is arranged on the surface of the silver metal layer, and the tin metal layer can be a plating layer, which is arranged on the side of the nickel metal layer away from the silver metal layer. The silver metal layer is the innermost layer, which is used to be electrically connected to the lead-out electrode 130 to improve the conductive efficiency. The adhesion between the silver metal layer and the tin metal layer is insufficient, and the nickel metal layer can be used as an intermediate layer to improve the adhesion and avoid peeling between different metal layers. The tin metal layer is the outermost layer, which is used for welding with external circuits or external devices.

[0080] It is understandable that the silver metal layer can be replaced by a gold metal layer, a copper metal layer, etc. Generally speaking, the inner metal layer electrically connected to the lead-out electrode 130 will be set to the same metal material as the lead-out electrode 130.

[0081] Table 1 shows some test parameters of a conventional inductor element and a novel inductor element provided in this embodiment. Both the conventional inductor element and the novel inductor element provided in this embodiment are provided with multiple layers of coil electrodes along the first direction X.

[0082] Table 1

[0083]

[0084]

[0085] It should be noted that the conventional inductor components and the new inductor components are configured as metric 0402 chip inductors.

[0086] As can be seen from Table 1, the inductance and quality factor of the novel inductor element are improved compared to the conventional inductor element by adopting the design provided by the present application, while the self-resonant frequency remains basically unchanged. In addition, the number of masks used to make the novel inductor element is only half of the number of masks used to make the conventional inductor element, which can effectively reduce the production cost of the inductor element.

[0087] The above is a detailed introduction to a coil assembly and an inductor element disclosed in an embodiment of the present application. This article uses individual examples to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand a coil assembly and an inductor element of the present application and its core idea; at the same time, for general technicians in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A coil assembly, characterized in that: include: An insulating body, inside which a first conductive part and a second conductive part are arranged at intervals along a first direction; A coil is arranged in the main body, the top-view plane where the winding direction of the coil is located is perpendicular to the first direction, and the orthographic projection of the coil on the top-view plane is roughly a rectangular ring; the coil is arranged between the first conductive part and the second conductive part and is electrically connected in sequence; The rectangular ring has a relative inner contour line and outer contour line, the orthographic projection of the first conductive part on the top-view plane is an inscribed circle tangent to any two adjacent sides of the outer contour line, and the orthographic projection of the second conductive part on the top-view plane is located inside the inner contour line.

2. The coil assembly according to claim 1, characterized in that: The orthographic projection of the second conductive portion on the top-view plane is an offline circle with a radius of r, the inner contour line includes a preset area, the center of the offline circle is located in the preset area, and the minimum distance between the boundary of the offline circle and the inner contour line is a; The radius of the inscribed circle is r, and the minimum distance between the boundary of the inscribed circle and the boundary of the preset area is a+r.

3. The coil assembly according to claim 2, characterized in that: The inner contour line has a first inner edge and a third inner edge arranged in parallel and extending along the second direction, and a second inner edge and a fourth inner edge arranged in parallel and extending along the third direction, the first inner edge, the second inner edge, the third inner edge and the fourth inner edge are sequentially connected end to end; the preset area has a first boundary line and a third boundary line arranged in parallel and extending along the second direction, the first boundary line is located between the first inner edge and the third boundary line, the distance between the first boundary line and the first inner edge is a+r, and the distance between the third boundary line and the third inner edge is a+r; The first direction, the second direction and the third direction are perpendicular to each other.

4. The coil assembly according to claim 3, characterized in that: The outer contour line comprises a first outer edge and a third outer edge which are arranged in parallel and extend along the second direction, and a second outer edge and a fourth outer edge which are arranged in parallel and extend along the third direction, the first outer edge, the second outer edge, the third outer edge and the fourth outer edge being connected end to end in sequence; the inscribed circle is tangent to the first outer edge and the second outer edge; The preset area also has a second boundary line and a fourth boundary line arranged in parallel and extending along the third direction, the second boundary line is located between the second inner edge and the fourth boundary line, the distance between the second boundary line and the second inner edge is a+r, and the distance between the fourth boundary line and the second inner edge is 5a+r.

5. The coil assembly according to claim 4, characterized in that: The straight line where the first boundary line, the straight line where the second boundary line, the straight line where the third boundary line and the straight line where the fourth boundary line are located define a rectangular area, and concentric circles with a radius a+2r and a center at the center of the inscribed circle intersect with the rectangular area, and the area outside the intersection of the rectangular area and the concentric circles is the preset area.

6. The coil assembly according to claim 4, characterized in that: The distance between the third boundary line and the fourth boundary line is a to 4a.

7. The coil assembly according to claim 3, characterized in that: The center of the inscribed circle is located at the intersection of the first inner side and the second inner side.

8. The coil assembly according to any one of claims 3 to 7, characterized in that: The minimum distance a between the boundary of the offline circle and the inner contour line satisfies: a≥12 μm, and the radius r of the inscribed circle satisfies: 12 μm≤r≤30 μm.

9. The coil assembly according to any one of claims 1 to 8, characterized in that: There are multiple first conductive parts and multiple second conductive parts. The coil includes multiple coil electrodes stacked along the first direction. The coil electrodes are arranged between the first conductive parts and the second conductive parts adjacent to each other along the first direction and are electrically connected in sequence.

10. An inductor element, characterized in that: It comprises two oppositely arranged external electrodes and the coil assembly as claimed in any one of claims 1 to 9, wherein the two external electrodes are arranged on the insulating body and are electrically connected to the two lead-out electrodes of the coil assembly in a one-to-one correspondence.

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