Inductance device and electronic equipment

Abstract

The invention relates to an inductance device and electronic equipment. The inductance device comprises a main body which comprises a plurality of dielectric layers which are mutually stacked; and at least one first inner electrode layer, wherein the at least one first inner electrode layer is arranged on the corresponding dielectric layer. The first inner electrode layer comprises a coil and a connecting conductor, the coil is arranged on one surface, in the thickness direction, of the corresponding dielectric layer, the coil is coiled into a spiral structure, the coil comprises a circumferential extension section and an avoiding coil section, and the avoiding coil section and the connecting conductor are adjacent and arranged at intervals; the avoiding coil section is positioned between the connecting conductor and the center of the spiral structure of the coil; at least part of the first inner edge face, facing the radial inner side of the coil, of the avoiding coil section and the second inner edge face, facing the radial inner side of the coil, of the connecting conductor have the contour shape matched with each other. According to the inductance device and the electronic equipment, the inductance value and the quality factor of the inductance device can be improved.

Description

Technical Field

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

[0002] In related technologies, multilayer inductors typically include an insulating frame, an internal electrode layer for inductance, and terminals for external connection. The internal electrode layer is located within the frame and is electrically connected to the terminals. The terminals are responsible for the physical connection to the external circuitry and form a conductive loop with the external circuitry. To achieve greater inductance, the single-layer internal electrode layer in related technologies often employs a multi-turn inductor shape design. Specifically, the single-layer internal electrode layer typically includes an outer conductive coil and an inner conductive coil wound around the inner coil. The end of the outer conductive coil also has a locally enlarged connecting conductor. In this design, the local area of ​​the inner conductive coil corresponding to the connecting conductor is usually contracted inward to ensure a sufficient safety distance from the connecting conductor. This results in a reduction in the overall in-coil area of ​​the internal electrode layer, leading to a loss of some inductance. Summary of the Invention

[0003] The purpose of this application is to provide an inductor and electronic device that can improve the inductance and quality factor of the inductor.

[0004] To achieve the above objectives, in a first aspect, this application provides an inductor device, comprising: The main body comprises multiple stacked dielectric layers; and At least one first inner electrode layer is disposed on a corresponding dielectric layer; the first inner electrode layer includes a coil and a connecting conductor, the coil is disposed on a surface of the corresponding dielectric layer along the thickness direction, and the coil is wound into a spiral structure, and the connecting conductor is connected to the outermost end of the coil; The coil includes a circumferential extension section and a coil avoidance section. The circumferential extension section extends along the circumference of the coil, and the coil avoidance section is adjacent to and spaced apart from the connecting conductor. The coil avoidance section is located between the center of the spiral structure connecting the conductor and the coil. At least a portion of the first inner edge surface of the avoidance coil segment facing the radially inner side of the coil has a matching profile shape with the second inner edge surface of the connecting conductor facing the radially inner side of the coil.

[0005] As an alternative implementation, the first outer edge surface of the bypass coil segment facing the radially outer side of the coil has a matching profile shape with the second inner edge surface of the connecting conductor.

[0006] As an optional implementation, the first inner edge surface and the second inner edge surface have the same outline shape; and / or the first outer edge surface and the second inner edge surface have the same outline shape. As an alternative implementation, the profile of at least one of the first inner edge surface and the first outer edge surface is formed by enlarging the profile of the second inner edge surface radially inward toward the coil, with the center of the connecting conductor as a reference.

[0007] As an optional implementation, the portion of the coil segment connected to the connecting conductor is offset radially inward relative to the coil. At least a portion of the structure of the coil segment is arranged relative to the center of the circumferential concave spiral structure of the coil to avoid the connecting conductor.

[0008] As an optional implementation, the circumferential extension segment includes a first coil segment and a second coil segment; The first coil segment is located on the outermost ring, the second coil segment is located inside the first coil segment, and the two ends of the avoidance coil segment are connected to the first coil segment and the second coil segment respectively. The end of the first coil segment that connects to the avoidance coil segment is positioned adjacent to the connecting conductor.

[0009] As an alternative implementation, the second inner edge surface, the first outer edge surface that avoids the coil segment and faces the radially outer side of the coil, and the first inner edge surface are sequentially located on three coaxial cylindrical surfaces with different radii.

[0010] As an alternative implementation, the coil has the same width dimension at all points along its extension direction; the spacing between different radially adjacent coil segments in the coil is a; The radius of the cylindrical surface containing the second inner edge surface is R; The radius of the cylindrical surface containing the first outer edge is R+a.

[0011] As an alternative implementation, the second inner edge surface, the first outer edge surface that avoids the coil segment and faces the radially outer side of the coil, and the first inner edge surface are parallel to each other and are all constructed as planes.

[0012] As an optional implementation, the second inner edge surface includes at least two connecting conductor sub-surfaces, adjacent connecting conductor sub-surfaces extending in different directions, and the at least two connecting conductor sub-surfaces are connected to each other as a whole; The first outer edge surface of the avoidance coil segment facing the radially outer side of the coil is provided with a first sub-surface corresponding to the connecting conductor sub-surface, and the first inner edge surface is provided with a second sub-surface corresponding to the connecting conductor sub-surface. The first sub-surfaces corresponding to each other and the connecting conductor sub-surfaces are parallel; The corresponding second sub-surfaces and the connecting conductor sub-surfaces are parallel to each other.

[0013] As an optional implementation, the number of connecting conductor sub-surfaces is two, the two connecting conductor sub-surfaces are perpendicular to the dielectric layer, and the extension directions of the two connecting conductor sub-surfaces are perpendicular.

[0014] As an optional implementation, the inductor further includes a first external electrode, a second external electrode, and two second internal electrode layers. The first and second external electrodes are disposed on the outer surface of the main body. One of the second internal electrode layers has a first transition electrode, which is electrically connected to the first external electrode and the connecting conductor. The other second internal electrode layer has a second transition electrode, which is electrically connected to the second external electrode and the innermost end of the coil.

[0015] Secondly, this application also discloses an electronic device, including the inductor device described above.

[0016] Compared with the prior art, the beneficial effects of this application are: In this application, the coil is placed on one surface of the corresponding dielectric layer along the thickness direction, and the coil is wound into a spiral structure. With this arrangement, the coil is formed into a single-layer spiral structure, that is, the coil is a multi-turn coil. Compared with the case where the coil in the single-layer inner electrode layer is a single-turn coil, the inductance can be improved.

[0017] Further, please refer to Figure 1 The outer contour surface of the clearance section of the inner conductive coil needs to be on the center-facing side of the first contour surface, and the inner contour surface of the clearance section needs to be on the center-facing side of the second contour surface. Figure 1 As shown, if the shape of the inner contour surface of the clearance section does not match the shape of the outer contour surface of the connecting conductor, then most points on the inner contour surface of the clearance section will be at a distance greater than a+w from the outer contour surface of the connecting conductor. In other words, the inner contour surface of the clearance section will be offset relative to the outer contour surface of the connecting conductor in the direction of the center, which will cause the inner area of ​​the inner conductive coil to become smaller.

[0018] In this application, at least a portion of the first inner edge surface of the bypass coil segment facing the radially inner side of the coil has a matching profile shape with the second inner edge surface of the connecting conductor facing the radially inner side of the coil. That is, compared with the related technology, more points on the first inner edge surface can be located on the second profile surface. In this way, the distance between more or even all positions on the first inner edge surface and the second inner edge surface of the connecting conductor can be set to be smaller (for example, it can be a minimum safety distance a). In other words, compared with the related technology, when the second inner edge surface of the connecting conductor is in the same position, the solution of this application allows the first inner edge surface of the bypass coil segment to expand outward as much as possible. This can increase the inner area of ​​the coil, thereby improving the inductance and the quality factor Q value. Attached Figure Description

[0019] 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.

[0020] Figure 1 This is a schematic diagram of the structure of an inductor in related technologies; Figure 2 This is a schematic diagram of the layered structure of the inductor device provided in the embodiments of this application; Figure 3 This is a schematic diagram of the structure of the first inner electrode layer in the inductor device provided in the embodiments of this application; Figure 4 This is a schematic diagram of another structure of the first inner electrode layer in the inductor device provided in the embodiments of this application; Figure 5 This is a schematic diagram of another structure of the first inner electrode layer in the inductor device provided in the embodiments of this application; Figure 6 This is a schematic diagram of another structure of the first inner electrode layer in the inductor device provided in the embodiments of this application; Figure 7 This is a schematic diagram of another structure of the first inner electrode layer in the inductor device provided in the embodiments of this application; Figure 8 This is a schematic diagram of the external appearance of the inductor device provided in the embodiments of this application; Figure 9 This is a side sectional view of the inductor device provided in the embodiments of this application; Figure 10 This is a schematic diagram of another structure of the inductor device provided in the embodiments of this application.

[0021] Explanation of reference numerals in the attached figures: 100. Inductive devices; 10. Main body; 20. Dielectric layer; 30. First inner electrode layer; 31. Coil; 300. Circumferential extension; 310. First coil segment; 311. First end; 3110. Transition surface; 320. Second coil segment; 321. Second end; 330. Coil clearance segment; 331. First inner edge surface; 3310. Second sub-surface; 332. First outer edge surface; 3320. First sub-surface; 36. Connecting conductor; 361. Second inner edge surface; 3610. Connecting conductor sub-surface; 3600. Outer contour surface; 3601. First contour surface; 3602. Second contour surface; 360. Inner ring connecting conductor; 41. First external electrode; 42. Second external electrode; 50. Second inner electrode layer; 51. First transition electrode; 52. Second transition electrode; 70. Conductive pillar; 80. Third inner electrode layer; 200, Internal electrode layer; 201, External conductive coil; 202, Internal conductive coil; 2020, Clearance section; 2021, Outer contour surface of the clearance section; 2022, Inner contour surface of the clearance section; F, first direction; S, second direction. Detailed Implementation

[0022] 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 of ordinary skill in the art without creative effort are within the scope of protection of this application. When the following description refers to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0023] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "inner," and "outer," 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.

[0024] 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.

[0025] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" 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.

[0026] 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.

[0027] An inductor is a common electronic component whose main function is to store and release magnetic energy. In modern electronics, inductors are widely used in various fields, such as communications, computers, and automotive electronics. The shape and size of the internal electrodes in inductor components directly affect their key performance characteristics, such as inductance and quality factor (Q).

[0028] Commonly used inductor devices include: an insulating frame body, an internal electrode layer that provides inductance, and terminals that connect to the outside. The internal electrode layer is located inside the frame body and is electrically connected to the terminals. The terminals are required to provide physical connection to the outside and form a conductive loop with the external circuit.

[0029] To achieve greater inductance, the internal electrode layer typically employs a multi-turn inductor shape design, such as... Figure 1 As shown, this is a common multi-turn inductor structure design in related technologies. The single-layer internal electrode layer 200 typically includes an outer conductive coil 201 and an inner conductive coil 202 wound around the inner coil. The end of the outer conductive coil 201 also has a connecting conductor 36 with a locally enlarged profile. In this design, the local area of ​​the inner conductive coil 202 corresponding to the connecting conductor 36 is easily affected by the connecting conductor 36. This is because, in a multi-turn inductor structure, it is necessary to ensure that the minimum distance between the outer conductive coil 201 and the inner conductive coil 202, or between the connecting conductor 36 and the inner conductive coil 202, is not less than a predetermined value 'a'. When the profile of the connecting conductor 36 is locally enlarged relative to the profile of the outer conductive coil 201, the position of the inner conductive coil 202 corresponding to the connecting conductor 36 will partially shrink inward, forming a clearance section 2020. This will cause the overall inner area of ​​the multi-turn inductor to decrease, resulting in a loss of inductance.

[0030] In detail, refer to Figure 1The relevant technology is illustrated by taking the outer contour surface 3600 of the connecting conductor 36 located on a cylindrical surface with radius R as an example. Taking the center of the connecting conductor 36 as a reference, the outer contour surface 3600 of the connecting conductor 36 is enlarged by different proportions towards the center O side of the inner conductive coil 202 to obtain the first contour surface 3601 and the second contour surface 3602. The distance between the first contour surface 3601 and the outer contour surface 3600 of the connecting conductor 36 is a, and the distance between the second contour surface 3602 and the outer contour surface 3600 of the connecting conductor 36 is a+w, where a is the minimum safe distance between adjacent coil segments, and w is the width of the outer conductive coil 201 and the inner conductive coil 202.

[0031] To ensure sufficient safety distance between the inner conductive coil 202 and the connecting conductor 36, the outer contour surface 2022 of the clearance section of the inner conductive coil 202 needs to be on the side of the first contour surface 3601 facing the center O, and the inner contour surface 2021 of the clearance section needs to be on the side of the second contour surface 3602 facing the center O. This results in a smaller inner coil area within the inner conductive coil 202.

[0032] In view of this, this application provides an inductor and an electronic device, in which at least a portion of the first inner edge surface of the coil segment facing the radially inner side of the coil has a matching profile shape with the second inner edge surface of the connecting conductor facing the radially inner side of the coil. In this way, the distance between more or even all positions on the first inner edge surface and the second inner edge surface can be set to be small (e.g., a minimum safety distance a). Compared with related technologies, when the second inner edge surface of the connecting conductor is in the same position, the solution of this application allows the first inner edge surface of the coil segment to expand outward as much as possible, which can increase the inner area of ​​the coil, thereby improving the inductance and the quality factor Q value.

[0033] The following will describe the scheme of this application in detail with reference to the accompanying drawings.

[0034] Please see Figure 2 and Figure 3 , Figure 2 This is a schematic diagram of the layered structure of the inductor device 100 provided in the embodiments of this application. Figure 3 This is a schematic diagram of the structure of the first inner electrode layer 30 in the inductor device 100 provided in this application embodiment. It should be noted that... Figure 2 In the diagram, for easier observation, the first inner electrode layer 30 is enlarged. Figure 2 On the right side of the image. Figure 3 In the diagram, for easier observation, the structure surrounding conductor 36 is enlarged. Figure 3 The bottom of the image.

[0035] The inductor device 100 provided in this application includes a body 10 and at least one first inner electrode layer 30. The body 10 includes a plurality of dielectric layers 20 stacked on top of each other. At least one first inner electrode layer 30 is disposed on a corresponding dielectric layer 20. The first inner electrode layer 30 includes a coil 31 and a connecting conductor 36. The coil 31 is disposed on a surface of the corresponding dielectric layer 20 along the thickness direction, and the coil 31 is wound into a spiral structure. The connecting conductor 36 is connected to the outermost end of the coil 31. The coil 31 includes a circumferential extension section 300 and a coil-avoiding section 330. The circumferential extension section 300 extends circumferentially along the coil 31. The coil-avoiding section 330 is adjacent to and spaced apart from the connecting conductor 36, and is located between the center of the spiral structure of the connecting conductor 36 and the coil 31.

[0036] At least a portion of the first inner edge surface 331 of the avoidance coil segment 330 facing the radially inner side of the coil 31 has a matching profile shape with the second inner edge surface 361 of the connecting conductor 36 facing the radially inner side of the coil 31.

[0037] In this application, the coil 31 is disposed on one surface of the corresponding dielectric layer 20 along the thickness direction, and the coil 31 is wound into a spiral structure. With this configuration, the coil 31 is formed into a single-layer spiral structure, that is, the coil 31 is a multi-turn coil 31. Compared with the case where the coil is wound into a single turn in a single-layer inner electrode layer, the inductance can be improved.

[0038] Furthermore, based on the aforementioned... Figure 1 As can be seen from the description, the outer contour surface 2022 of the clearance section of the inner conductive coil 202 needs to be on the side of the first contour surface 3601 facing the center O, and the inner contour surface 2021 of the clearance section needs to be on the side of the second contour surface 3602 facing the center. Figure 1 As shown, if the shape of the inner contour surface 2021 of the clearance segment does not match the shape of the outer contour surface 3600 of the connecting conductor 36, then most points on the inner contour surface 2021 of the clearance segment will be at a distance greater than a+w from the outer contour surface 3600 of the connecting conductor. That is to say, at least most of the positions on the inner contour surface 2021 of the clearance segment will be offset relative to the outer contour surface 3600 of the connecting conductor 36 towards the center O, which will cause the inner area of ​​the inner conductive coil 202 to become smaller.

[0039] Please see Figure 3 The solution in this application differs from the previous one in that at least a portion of the first inner edge surface 331 of the avoidance coil segment 330 facing the radially inner side of the coil 31 has a matching profile shape with the second inner edge surface 361 of the connecting conductor 36 facing the radially inner side of the coil 31. That is to say, it is consistent with... Figure 1Compared to the previous scheme, more points on the first inner edge surface 331 can be located on the second contour surface 3602. This allows for a smaller distance (e.g., a minimum safety distance a) between more, or even all, positions on the first inner edge surface 331 and the second inner edge surface 3602. In other words, compared to related technologies, when the second inner edge surface 361 of the connecting conductor 36 is in the same position, the scheme of this application allows the first inner edge surface 331 of the coil segment 330 to expand outwards as much as possible in the radial direction of the coil 31. This increases the inner area of ​​the coil 31, thereby improving the inductance and the quality factor Q. It should be noted that the above description uses a cylindrical outer contour surface 3600 of the connecting conductor 36 as an example. The same principle applies to other shapes of the outer contour surface 3600 of the connecting conductor 36, and will not be repeated here.

[0040] In this embodiment, the main body 10 can be configured as an insulating component. For example, the main body 10 can be a ceramic main body 10, in which case the dielectric layer 20 can be a ceramic dielectric layer. The first inner electrode layers 30 are respectively disposed on the corresponding dielectric layers 20, so that the dielectric layers 20 can be sandwiched between each of the first inner electrode layers 30, thereby providing insulation between each of the first inner electrode layers 30. It can be understood that one or more dielectric layers 20 can be sandwiched between two adjacent first inner electrode layers 30. In addition, the coil 31 is wound into a spiral structure. Here, the spiral structure means that the winding trend of the coil 31 is roughly spiral. The specific implementation method is not limited. For example, it can be as follows: Figure 3 As shown, each coil segment is approximately rectangular, or each coil segment can be approximately circular. In other embodiments, the spiral shape can also be an Archimedean spiral. The spiral direction can be counterclockwise or clockwise.

[0041] In this application, the connecting conductor 36 can be a through-hole metal, for example, a through-hole can be formed in the dielectric layer 20, and the connecting conductor 36 can be a metal pillar formed in the through-hole. The coil 31 can be printed on a surface of the corresponding dielectric layer 20 along the thickness direction and electrically connected to the connecting conductor 36. An inner coil connecting conductor 360 can also be connected to the end of the inner coil of the coil 31 to electrically connect the coil 31 to other inner electrode layers. In addition, the circumferential extension 300 extending circumferentially along the coil 31 means, for example, that the extension direction of the circumferential extension 300 is along the circumference of the coil 31. The avoidance coil segment 330 is located between the center O1 of the spiral structure of the connecting conductor 36 and the coil 31, meaning that the avoidance coil segment 330 is located radially inside the coil 31 of the connecting conductor 36.

[0042] At least a portion of the first inner edge surface 331 of the bypass coil segment 330 facing the radially inner side of the coil 31 has a matching profile shape with the second inner edge surface 361 of the connecting conductor 36 facing the radially inner side of the coil 31. For example, a portion of the first inner edge surface 331 of the bypass coil segment 330 facing the radially inner side of the coil 31 may have a matching profile shape with the second inner edge surface 361 of the connecting conductor 36 facing the radially inner side of the coil 31. Alternatively, the entire first inner edge surface 331 of the bypass coil segment 330 facing the radially inner side of the coil 31 may have a matching profile shape with the second inner edge surface 361 of the connecting conductor 36 facing the radially inner side of the coil 31.

[0043] Please refer to the embodiments in this application. Figure 3 The connecting conductor 36 is offset radially inward from the portion of the coil segment connected to the connecting conductor 36 relative to the coil 31. This avoids at least a portion of the structure of the coil segment 330 relative to the center O1 of the circumferentially concave spiral structure of the coil 31, thus avoiding the connecting conductor 36. With this arrangement, while maintaining the overall layout space of the first inner electrode layer 30, offsetting the connecting conductor 36 towards the center O1 increases the radial dimension of the outermost coil segment of the coil 31, thereby increasing the length of the outermost coil segment and improving the inductance.

[0044] In this embodiment, the first inner edge surface 331 and the second inner edge surface 361 can have the same outline shape. This ensures that the entire first inner edge surface 331 is located on the second outline surface 3602, and that the distance between the entire first inner edge surface 331 and the second inner edge surface 361 (which is the part of the outer outline surface 3600 of the conductor 36 that faces the radially inward side of the coil 31) can be minimized.

[0045] Furthermore, the first outer edge surface 332 of the bypass coil segment 330, facing radially outward towards the coil 31, can have a matching profile shape with the second inner edge surface 361 of the connecting conductor 36. This allows the first outer edge surface 332 to be located on the first profile surface 3601, and also allows the distance between the first outer edge surface 332 and the second inner edge surface 361 to be relatively small. Preferably, the first outer edge surface 332 can have the same profile shape as the second inner edge surface 361.

[0046] In a specific implementation, the contour of at least one of the first inner edge surface 331 and the first outer edge surface 332 can be enlarged from the contour of the second inner edge surface 361, with the center of the connecting conductor 36 as a reference, towards the radially inward side of the coil 31. It is understood that the enlargement ratio of the first inner edge surface 331 can be greater than the enlargement ratio of the first outer edge surface 332. When the first inner edge surface 331 is enlarged, all parts on the first inner edge surface 331 are enlarged proportionally; similarly, when the first outer edge surface 332 is enlarged, all parts on the first outer edge surface 332 are enlarged proportionally.

[0047] In this embodiment, the coil 31 can be constructed as a strip, with the same width dimension at all points along its extension direction. This maximizes the inductance within a limited layout space while preventing short circuits and contact between radially adjacent coil segments on the coil 31.

[0048] Figure 4 This is a schematic diagram of another structure of the first inner electrode layer 30 in the inductor device 100 provided in the embodiments of this application.

[0049] In the embodiments of this application, please refer to Figure 3 and Figure 4 Referring to the reference, the circumferential extension 300 may include a first coil segment 310 and a second coil segment 320. The first coil segment 310 is located on the outermost ring, and the second coil segment 320 is located inside the first coil segment 310. The two ends of the avoidance coil segment 330 are respectively connected to the first coil segment 310 and the second coil segment 320. The end of the first coil segment 310 connected to the avoidance coil segment 330 is disposed adjacent to the connecting conductor 36. Thus, the first coil segment 310 is the outermost coil segment, and the second coil segment 320 is the innermost coil segment. The first coil segment 310 is actually arranged approximately around the entire circumference, and the extension length of the second coil segment 320 along the circumference of the coil 310 can be, for example, as shown in the figure. Figure 3 As shown, roughly three-quarters of the way around the circumference, or as... Figure 4 As shown, it covers approximately half of the circumference of the coil 31.

[0050] exist Figure 3 and Figure 4 In the example, coil 31 is roughly rectangular and spiral-shaped. The connecting conductor 36 can be located at the corner of this rectangular shape.

[0051] In this embodiment, the connecting conductor 36 can be a through-hole metal, i.e., a cylindrical metal. In this case, the second inner edge surface 361, the first outer edge surface 332 (which avoids the coil segment 330 and faces the coil 31 radially outward), and the first inner edge surface 331 are sequentially located on three coaxial cylindrical surfaces with different radii. That is to say, the second inner edge surface 361, the first outer edge surface 332, and the first inner edge surface 331 are all part of a cylindrical surface. Figure 3 In the example, the central angle α corresponding to the first inner edge surface 331 is approximately 50°, and the central angle β corresponding to the first outer edge surface 332 is approximately 63°. Figure 3 In the example, the first end 311 of the first coil segment 310 connected to the avoidance coil segment 330 can extend along the first direction F, and the second end 321 of the second coil segment 320 connected to the avoidance coil segment 330 can extend along the second direction S, wherein the first direction F and the second direction S are perpendicular to the thickness direction of the dielectric layer 20. The first end 311 may include a transition surface 3110 that connects to the first outer edge surface 332. The transition surface 3110 is planar and perpendicular to the first direction F.

[0052] In this embodiment, as described above, the coil 31 has the same width dimension w at all points along its extension direction. The distance between adjacent coil segments in the coil 31 along the radial direction is a, that is, the corresponding portions of the first coil segment 310 and the second coil segment 320 have the same distance a at all points along the extension direction of the first coil segment 310. Thus, the radius of the cylindrical surface where the second inner edge surface 361 is located is R. The radius of the cylindrical surface where the first outer edge surface 332 is located is R+a. The radius of the cylindrical surface where the first inner edge surface 331 is located is R+a+w. Wherein, a≥15 micrometers, 12 micrometers≤R≤30 micrometers, and w≥11.5 micrometers.

[0053] Figure 5 , Figure 6 , Figure 7 This is a schematic diagram of another structure of the first inner electrode layer in the inductor device provided in the embodiments of this application.

[0054] Please see Figure 5 In another possible implementation, the second inner edge surface 361, the first outer edge surface 332 of the coil segment 330 facing radially outward toward the coil 31, and the first inner edge surface 331 are parallel to each other and are all constructed as planes. In this case, the connecting conductor 36 can be part of a cylinder, that is, equivalent to forming it by cutting away a portion of the structure along the height direction of a cylinder. This embodiment is similar to... Figure 3 Compared to the example in the example, coil 31 will have a larger in-coil area.

[0055] In the foregoing embodiments, the second inner edge surface 361 of the connecting conductor 36 is formed from a single surface. In other embodiments, the second inner edge surface 361 may include multiple sub-surfaces. Further, please refer to... Figure 6 , Figure 7 In other possible embodiments, the second inner edge surface 361 includes at least two connecting conductor sub-surfaces 3610, adjacent connecting conductor sub-surfaces 3610 extending in different directions, and these connecting conductor sub-surfaces 3610 are connected to each other as a whole. The first outer edge surface 332 of the coil segment 330, facing radially outward from the coil 31, has the same number of first sub-surfaces 3320 corresponding to the connecting conductor sub-surfaces 3610, and the first inner edge surface 331 has the same number of second sub-surfaces 3310 corresponding to the connecting conductor surface 3610. The corresponding first sub-surfaces 3320 and connecting conductor sub-surfaces 3610 are parallel. The corresponding second sub-surfaces 3310 and connecting conductor surface 3610 are parallel. This arrangement ensures that the second inner edge surface 361, the first outer edge surface 332, and the first inner edge surface 331 can have the same profile shape.

[0056] exist Figure 6 In the example, the second inner edge surface 361 is formed by three connecting conductor sub-surfaces 3610 connected together. The three connecting conductor sub-surfaces 3610 are arranged around the circumference of the connecting conductor 36. The connecting conductor sub-surface 3610 in the middle is formed as an arc surface, and the two connecting conductor sub-surfaces 3610 at the edges are formed as planes. The arrangement of the first sub-surface 3320 and the second sub-surface 3310 is similar, and will not be described again here.

[0057] exist Figure 7 In the example, the second inner edge surface 361 is formed by two mutually perpendicular connecting conductor sub-surfaces 3610, that is, the extending directions of the two connecting conductor sub-surfaces 3610 are perpendicular. The two connecting conductor sub-surfaces 3610 are arranged around the circumference of the connecting conductor 36, and both connecting conductor sub-surfaces 3610 are formed as planes. The two connecting conductor sub-surfaces 3610 can extend along the first direction F and the second direction S respectively, and are perpendicular to the dielectric layer 20. Furthermore, the arrangement of the first sub-surface 3320 and the second sub-surface 3310 is similar, and will not be described again here.

[0058] Figure 8 This is a schematic diagram of the exterior of the inductor 100 provided in an embodiment of this application. Figure 9 This is a side sectional view of the inductor 100 provided in an embodiment of this application. Figure 10 This is a schematic diagram of another structure of the inductor device 100 provided in the embodiments of this application.

[0059] In the embodiments of this application, please refer to Figure 2, Figure 7 and Figure 8 The inductor 100 also includes a first external electrode 41, a second external electrode 42, and two second inner electrode layers 50. The first external electrode 41 and the second external electrode 42 are disposed on the outer surface of the main body 10. One of the second inner electrode layers 50 has a first transition electrode 51, which is electrically connected to the connecting conductor 36 at the outer end of the first external electrode 41 and the outermost coil of the coil 31. The other second inner electrode layer 50 has a second transition electrode 52, which is electrically connected to the connecting conductor 360 at the innermost coil of the second external electrode 42 and the innermost coil of the coil 31. The first external electrode 41 and the second external electrode 42 generally include three layers of material. From the inside out, the innermost layer is generally the same as the coil 31 material, the second layer is nickel, and the outermost layer is tin. Figure 8 In the example, the inductor 100 of the present application embodiment has a generally cuboid shape and may include three pairs of parallel sides.

[0060] Furthermore, there are multiple first inner electrode layers 30, and the coils 31 on the multiple first inner electrode layers 30 are connected in series through conductive posts 70 passing through the dielectric layer 20.

[0061] Specifically, in Figure 2 The example shows two first inner electrode layers 30 where the winding directions of the coils 31 are exactly opposite, located in... Figure 2 The coil 31 (hereinafter also referred to as the upper coil 31) of the first inner electrode layer 30 on the upper side of the figure rotates counterclockwise from the outside to the inside, located at... Figure 2 The coil 31 of the first inner electrode layer 30 on the lower side of the figure (hereinafter also referred to as the lower coil 31) rotates clockwise from the outside to the inside.

[0062] The connecting conductor 36 at the outer end of the upper coil 31 is electrically connected to the first transition electrode 51 through a conductive post 70. The inner connecting conductor 360 at the inner end of the upper coil 31 is electrically connected to the inner connecting conductor 360 at the inner end of the lower coil 31 through a conductive post 70. The connecting conductor 36 at the outer end of the lower coil 31 is electrically connected to the second transition electrode 52 through a conductive post 70. The first transition electrode 51 is electrically connected to the first outer electrode 41, and the second transition electrode 52 is electrically connected to the second transition electrode 52.

[0063] In some embodiments, it may also be as follows Figure 10 As shown, in Figure 2 Based on the inductor device 100 shown, one of the first inner electrode layers 30 is replaced with a third inner electrode layer 80. The inductor coil disposed on the third inner electrode layer 80 can be an inductor coil from related technologies. After replacing the electrode layer, the remaining structure of the inductor device 100 is the same as... Figure 2The situation is similar, so I will not go into details here.

[0064] The following describes the fabrication method of the inductor 100 of this application: Raw materials are coated onto a carrier plate using a doctor blade to form a substrate, which serves as the dielectric layer 20. A conductive paste is printed on the substrate, and a coil 31 is formed by exposure and development. Then, through-holes are made on the dielectric, and metal paste is formed in the through-holes to form connecting conductors 36.

[0065] Repeat the above steps until the preset number of layers is obtained, cut them with a cutter and monolithize them, thereby obtaining the shape of the inductor device.

[0066] The above-mentioned shape is placed in a firing furnace and subjected to debinding treatment at 465°C in an atmospheric environment, followed by sintering at 900°C, thereby obtaining a structure with electrical properties.

[0067] By means of silvering, electroplating, etc., an Ag layer, a Ni plating layer and a Sn plating layer are sequentially formed on the two end surfaces of the above structure to form the first external electrode 41 and the second external electrode 42, and finally to form the inductor device 100.

[0068] The present invention does not require changing the layout and structure of the coil 31 in the inner electrode layer. The inductance can be improved by optimizing the local shape of the second coil segment 320. The structure is simple and feasible, and it is easy to achieve miniaturization design. It overcomes the disadvantage of increasing the product thickness due to increasing the number of turns of the coil 31 in the traditional way.

[0069] To verify the performance improvement effect of the inductor device 100 of this application embodiment compared with the inductor devices of related technologies, the inventors of this application tested the inductance value and quality factor of the inductor device using the first inner electrode layer 30 of this application embodiment and the inductor devices of related technologies. The results are recorded in Table 1 below. In addition, Table 1 shows two sizes of inductor devices, namely, inductor devices with a length * width * height of 0.6mm * 0.3mm * 0.3mm and a length * width * height of 0.4mm * 0.2mm * 0.2mm.

[0070] Among them, the following will be adopted Figure 3 The inductor in the first inner electrode layer 30 of the structure shown is denoted as inductor A1, and will employ... Figure 5 The inductor in the first inner electrode layer 30 of the structure shown is denoted as inductor A2, and will employ... Figure 6 The inductor in the first inner electrode layer 30 of the structure shown is denoted as inductor A3, and the inductor in the inner electrode layer using conventional technology is denoted as inductor B1. The improvement rates of the inductance value L and quality factor Q of inductors A1, A2, and A3 relative to inductor B1 are also recorded in Table 1.

[0071] Table 1:

[0072] As can be seen from Table 1, the following methods were adopted: Figure 3 Compared to conventional inductor devices B1, the inductor device A1 of the first inner electrode layer 30 of the structure shown has a 5.59% increase in inductance and a 2.67% increase in quality factor for a 0.6mm*0.3mm*0.3mm model, and a 3.90% increase in inductance and a 2.88% increase in quality factor for a 0.4mm*0.2mm*0.2mm model.

[0073] Adopted Figure 5 Compared to conventional inductor devices B1, the inductor device A2 in the first inner electrode layer 30 of the structure shown has a 6.52% higher inductance value and a 2.50% higher quality factor for a 0.6mm*0.3mm*0.3mm model, and a 4.76% higher inductance value and a 1.85% higher quality factor for a 0.4mm*0.2mm*0.2mm model.

[0074] Adopted Figure 6 Compared to conventional inductor devices B1, the inductor device A3 of the first inner electrode layer 30 in the structure shown has a 7.14% increase in inductance and a 2.16% increase in quality factor for a 0.6mm*0.3mm*0.3mm model, and a 5.63% increase in inductance and a 1.51% increase in quality factor for a 0.4mm*0.2mm*0.2mm model.

[0075] Therefore, it can be seen that the inductor device provided in this application embodiment has a significantly improved inductance value and quality factor compared with traditional inductor devices.

[0076] In addition, this application also discloses an electronic device including the aforementioned inductor 100.

[0077] It is understood that electronic devices having the inductor as described above can bring the same or similar beneficial effects as the inductor, as can be seen from the description of the foregoing embodiments, which will not be repeated here.

[0078] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0079] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. An inductor device, characterized in that, include: The main body (10) includes multiple stacked dielectric layers (20). as well as At least one first inner electrode layer (30) is disposed on the corresponding dielectric layer (20); the first inner electrode layer (30) includes a coil (31) and a connecting conductor (36), the coil (31) is disposed on a surface of the corresponding dielectric layer (20) along the thickness direction, and the coil (31) is wound into a spiral structure, and the connecting conductor (36) is connected to the outermost end of the coil (31); The coil (31) includes a circumferential extension section (300) and a clearance coil section (330). The circumferential extension section (300) extends circumferentially along the coil (31). The clearance coil section (330) is adjacent to and spaced apart from the connecting conductor (36). The clearance coil section (330) is located between the center of the spiral structure of the connecting conductor (36) and the coil (31). At least a portion of the first inner edge surface (331) of the avoidance coil segment (330) facing the radially inner side of the coil (31) has a matching profile shape with the second inner edge surface (361) of the connecting conductor (36) facing the radially inner side of the coil (31).

2. The inductor device according to claim 1, characterized in that, The first outer edge surface (332) of the avoidance coil segment (330) facing the radially outer side of the coil (31) has a matching profile shape with the second inner edge surface (361) of the connecting conductor (36).

3. The inductor device according to claim 2, characterized in that, The first inner edge surface (331) has the same contour shape as the second inner edge surface (361); and / or The first outer edge surface (332) has the same outline shape as the second inner edge surface (361).

4. The inductor device according to claim 3, characterized in that, The profile of at least one of the first inner edge surface (331) and the first outer edge surface (332) is formed by enlarging the profile of the second inner edge surface (361) radially inward toward the coil (31) with reference to the center of the connecting conductor (36).

5. The inductor device according to claim 1, characterized in that, The portion of the coil segment connected to the connecting conductor (36) relative to the coil (31) is offset radially inward from the coil (31); At least a portion of the structure of the avoidance coil segment (330) is circumferentially concave toward the center of the spiral structure relative to the coil (31) to avoid the connecting conductor (36).

6. The inductor device according to any one of claims 1-5, characterized in that, The circumferential extension segment (300) includes a first coil segment (310) and a second coil segment (320); The first coil segment (310) is located on the outermost ring, the second coil segment (320) is located on the inner side of the first coil segment (310), and the two ends of the avoidance coil segment (330) are respectively connected to the first coil segment (310) and the second coil segment (320). The end of the first coil segment (310) that connects to the avoidance coil segment (330) is disposed adjacent to the connecting conductor (36).

7. The inductor device according to any one of claims 1-5, characterized in that, The second inner edge surface (361), the first outer edge surface (332) of the avoidance coil segment (330) facing the outer radial direction of the coil (31), and the first inner edge surface (331) are located on three coaxial cylindrical surfaces with different radii.

8. The inductor device according to claim 7, characterized in that, The coil (31) has the same width dimension (w) at all points along its own extension direction; the spacing between different adjacent coil segments in the coil (31) along the radial direction is (a); The radius of the cylindrical surface on which the second inner edge surface (361) is located is R; The radius of the cylindrical surface on which the first outer edge surface (332) is located is R+a.

9. The inductor device according to any one of claims 1-5, characterized in that, The second inner edge surface (361), the first outer edge surface (332) of the avoidance coil segment (330) facing the radially outer side of the coil (31), and the first inner edge surface (331) are parallel to each other and are all constructed as planes.

10. The inductor according to any one of claims 1-5, characterized in that, The second inner edge surface (361) includes at least two connecting conductor sub-surfaces (3610), adjacent connecting conductor sub-surfaces (3610) extending in different directions, and the at least two connecting conductor sub-surfaces (3610) are connected to each other as a whole; The first outer edge surface (332) of the avoidance coil segment (330) facing the radially outer side of the coil (31) is provided with a first sub-surface (3320) corresponding to the connecting conductor sub-surface (3610), and the first inner edge surface (331) is provided with a second sub-surface (3310) corresponding to the connecting conductor sub-surface (3610). The first sub-surface (3320) and the connecting conductor sub-surface (3610) that correspond to each other are parallel; The second sub-surface (3310) and the connecting conductor sub-surface (3610) that correspond to each other are parallel.

11. The inductor according to claim 10, characterized in that, The number of the connecting conductor sub-surfaces (3610) is two, and the two connecting conductor sub-surfaces (3610) are perpendicular to the dielectric layer (20), and the extension directions of the two connecting conductor sub-surfaces (3610) are perpendicular.

12. The inductor device according to any one of claims 1-5, characterized in that, The inductor (100) further includes a first external electrode (41), a second external electrode (42), and two second inner electrode layers (50). The first external electrode (41) and the second external electrode (42) are disposed on the outer surface of the main body (10). One of the second inner electrode layers (50) is provided with a first transition electrode (51), which is electrically connected to the first external electrode (41) and the connecting conductor (36). The other second inner electrode layer (50) is provided with a second transition electrode (52), which is electrically connected to the second external electrode (42) and the innermost end of the coil (31).

13. An electronic device, characterized in that, Including the inductor as described in any one of claims 1-12.

Images