Inductive element and electronic device

Abstract

The application relates to the technical field of inductance elements, in particular to an inductance element and an electronic device. The inductance element comprises a main body, two external terminals and a coil. The main body has a top surface and a bottom surface arranged oppositely and two side surfaces arranged oppositely, the opposite direction of the top surface and the bottom surface is a first direction, and the opposite direction of the two side surfaces is a second direction; the two external terminals are arranged on the side of the bottom surface away from the top surface along the second direction; the height of the external terminal along the first direction is H1, the width of the external terminal along the second direction is W1, and 0.1<=H1 / W1<=0.35. The coil is arranged in the main body and is electrically connected with the external terminal; the coil comprises at least one layer of internal electrodes, and the internal electrodes at least partially extend between the external terminal and the top surface. The inductance element has the advantages of large inductance and high Q value, and good installation stability.

Description

Technical Field

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

[0002] Within an inductor, the internal electrodes within the main body need to be spaced a certain distance from the external terminals, making the routing of the internal electrodes near the external terminals tortuous and difficult. This forces the internal electrode size to shrink, making it difficult to further increase the area within the internal electrode coil, thus limiting the inductance and quality factor (Q value) of the inductor. Utility Model Content

[0003] This application discloses an inductor and an electronic device that can have both a large inductance and a high Q value, and has good installation stability.

[0004] To achieve the above objectives, in a first aspect, embodiments of this application disclose an inductor element, comprising: The main body has a top surface and a bottom surface that are arranged opposite to each other, and two side surfaces that are arranged opposite to each other. The relative direction of the top surface and the bottom surface is a first direction, and the relative direction of the two side surfaces is a second direction. The first direction and the second direction intersect. Two external terminals are spaced apart along the second direction on the side of the bottom surface opposite to the top surface, and the ends of the two external terminals away from each other extend to the nearest side surface, and extend along the side surface in a direction close to the top surface; the height of the external terminals along the first direction is H1, and the width of the external terminals along the second direction is W1, wherein 0.1 ≤ H1 / W1 ≤ 0.35; and A coil is disposed within the main body and electrically connected to the external terminal; the coil includes at least one inner electrode, the plane of which is parallel to the plane formed by the first direction and the second direction; at least a portion of the inner electrode extends between the external terminal and the top surface.

[0005] In a possible implementation of the first aspect, on the side surface, the orthographic projection of the inner electrode partially overlaps with the orthographic projection of the outer terminal, and the overlapping portion is an overlapping region. The orthographic projection area of ​​a single inner electrode on the side surface is S1, and the area of ​​the overlapping region of a single inner electrode is S2, wherein S2 / S1 < 5%.

[0006] In one possible implementation of the first aspect, the total number of internal electrodes is n, where n×S2 < 700 square micrometers.

[0007] In a possible implementation of the first aspect, on the side surface, the orthographic projection of the inner electrode partially overlaps with the orthographic projection of the outer terminal, and the overlapping portion is an overlapping region. The length of each overlapping region along the first direction is L1, and the linewidth of the inner electrode is W2, wherein L1 < W2.

[0008] In one possible implementation of the first aspect, the body is a hexahedron, and the body also has a front and a back side disposed opposite to each other, and the orthographic projection shape of the external terminal on the front side is L-shaped.

[0009] In a possible implementation of the first aspect, the inductor element further includes: Two internal terminals are spaced apart along the second direction on the side of the bottom surface facing the top surface, and each external terminal is correspondingly disposed on the outside of each internal terminal.

[0010] In a possible implementation of the first aspect, the internal electrode includes: Two side conductors are provided at intervals along the second direction, and each side conductor extends between the internal terminal and the top surface; An upper conductor, the upper conductor extending along the second direction, and one end of each of the side conductors near the top surface respectively connected to one end of the upper conductor along the second direction; and A lower side conductor is connected to one end of at least one of the side conductors near the external terminal. The lower side conductor extends at least partially along the upper profile of the internal terminal, the upper profile being the side profile of the internal terminal facing the top surface.

[0011] In a possible implementation of the first aspect, the lower conductor includes: At least one first conductor segment, each first conductor segment being connected to one end of each of the side conductors near the bottom surface and extending along the second direction near the center of the body; At least one second conductor segment, each second conductor segment being connected to one end of the first conductor segment near the center of the body, and the second conductor segment also being bent relative to the first conductor segment and close to the bottom surface; A third conductor segment is connected to at least one end of the second conductor segment near the bottom surface and extends along the second direction between the two internal terminals.

[0012] In a possible implementation of the first aspect, the distance between the third conductor segment and the bottom surface is D1, satisfying the following relationship: 0.6 ≤ D1 / H1 ≤ 1.6; and / or, The two internal terminals are spaced apart along the second direction with a spacing of D2; along the second direction, the narrowest distance between the third conductor segment and the internal terminals is D3, satisfying the following relationship: 0.05 ≤ D3 / D2 ≤ 0.1; and / or, The included angle α between the first conductor segment and the second conductor segment is greater than 180°; and / or, The inner electrode has an electrical connection portion, which is located at the corner of the lower conductor; and / or, The side guide wire extends along the first direction; wherein, along the first direction, the length of the side guide wire is L2, and the height of the main body is H2, satisfying the following relationship: 0.7 ≤ L2 / H2 ≤ 0.85; and / or, Along the second direction, the distance between each of the side conductors and the nearest side is D0, where 3 micrometers ≤ D0 ≤ 15 micrometers.

[0013] In a possible implementation of the first aspect, the external terminal comprises a nickel layer and a tin layer from the inside out, the nickel layer being connected between the tin layer and the internal terminal; The nickel layer has a thickness of 1 micrometer to 5 micrometers, and the tin layer has a thickness of 3 micrometers to 5 micrometers.

[0014] Secondly, embodiments of this application disclose an electronic device including an inductor as described in the first aspect.

[0015] Compared with the prior art, the beneficial effects of this application are: In this application, on the plane where the inner electrode is located, the two external terminals are located on the bottom side. In this way, in order to reduce parasitic capacitance, only the bottom section of the inner electrode needs to avoid the external terminals, and the rest of the inner electrode can be as close as possible to the body outline, thereby increasing the inner area.

[0016] When the height H1 of the external terminal along the first direction satisfies H1 / W1≤0.35, the height H1 of the external terminal along the first direction is sufficiently small, providing a large space between the external terminal and the top surface for the extension of the inner electrode, which is beneficial for increasing the in-circle area of ​​the inner electrode. Since the inductance is proportional to the in-circle area of ​​the inner electrode, a larger in-circle area of ​​the inner electrode is beneficial for increasing the contribution of a single inner electrode to the inductance. In this way, this application can easily achieve the expected inductance even without using a single-layer multi-turn wire group, thereby avoiding the Q-value degradation caused by proximity effect, so that the inductor element has both a large inductance and a high Q value.

[0017] Building upon this, the ends of the two external terminals furthest from each other extend to the nearest side surface, and then extend along the side surface towards the top, allowing the main body to connect with the outside world (e.g., a circuit board) via the external terminals, bottom surface, and sides, thereby further enhancing the installation stability of the inductor 1. Furthermore, the height H1 of the external terminals along the first direction must satisfy 0.1 ≤ H1 / W1. At this point, the height H1 of the external terminals on the side surface along the first direction is still sufficiently large to ensure a strong connection force during installation, preventing them from easily falling off.

[0018] In summary, when the height H1 of the external terminal along the first direction satisfies 0.1≤H1 / W1≤0.35, the inductor has both a large inductance and a high Q value, and its installation stability is good. 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 projection of the coil of an inductor disclosed in an embodiment of this application onto the front of the main body; Figure 2 This is a graph showing the relationship between the Q value and H1 / W1 as disclosed in the embodiments of this application; Figure 3 This is a side view of an inductor element disclosed in an embodiment of this application; Figure 4 This is another projected schematic diagram of the coil of an inductor element disclosed in an embodiment of this application on the front side of the main body; Figure 5 This is a graph showing the relationship between the Q value and L1 / W2 as disclosed in the embodiments of this application; Figure 6 This is a schematic diagram of a deformed coil structure disclosed in an embodiment of this application; Figure 7 This is an exploded view of an inductor element disclosed in an embodiment of this application; Figure 8 This is a schematic diagram of the structure of an electronic device disclosed in an embodiment of this application.

[0021] Explanation of reference numerals in the attached figures: 1. Inductor element; 11. Body; 111. Top surface; 112. Bottom surface; 113. Side surface; 114. Front surface; 115. Back surface; 12. Internal terminal; 121. Upper contour; 122. Chamfered contour; M13. Coil; 13. Inner electrode; 131. Side conductor; 132. Lower conductor; 1321. First conductor segment; 1322. Second conductor segment; 1323. Third conductor segment; 133. Electrical connection part; 134. Upper conductor; 14. Insulating layer; 15. External terminal; 151. Nickel layer; 152. Tin layer; A. Overlapping area; Z. First direction; X. Second direction; Y. Third direction; 100. Electronic devices. 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 skilled in the art without creative effort are within the scope of protection of this application.

[0023] In this application, the terms "top," "bottom," "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 devices, elements, or components to having a specific orientation, or to be constructed and operated in a specific orientation.

[0024] 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.

[0025] 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.

[0026] For inductive components, inductance and Q value are two parameters that are difficult to balance simultaneously. The analysis is as follows: To conduct the internal electrodes, external terminals need to be placed on the outer surface of the inductor body. However, both the internal coil and the external terminals are conductors, and if they are too close together, excessive parasitic capacitance can easily be generated.

[0027] Therefore, the coil needs to be spaced a certain distance from the external terminals, making the coil routing near the external terminals difficult and tortuous. For example, in some parts of the coil, the coil area is passively reduced to avoid external terminals and requires a bend. Since the inductance is directly proportional to the coil area, the contribution of the single-layer inner electrode in the coil to the inductance decreases as the coil area decreases.

[0028] Although an inductor can achieve the desired inductance through a single-layer multi-turn coil, which refers to a coil structure formed by winding multiple turns of wire in the same plane (or single-layer space), the Q value of the inductor will deteriorate rapidly due to the proximity effect.

[0029] In general, it is difficult for inductors to simultaneously have a large inductance and a high quality factor.

[0030] Based on the above analysis, this application provides an inductor element in which the height H1 of the external terminal along the first direction satisfies 0.1≤H1 / W1≤0.35. The inductor element has both a large inductance and a high Q value, and the installation stability is good.

[0031] The technical solution of this utility model will be described below with reference to the embodiments and accompanying drawings.

[0032] Reference Figure 1 This application discloses an inductor 1, which includes a body 11, two external terminals 15 and a coil M13.

[0033] The main body 11 has a top surface 111 and a bottom surface 112 that are arranged opposite to each other, and two side surfaces 113 that are arranged opposite to each other. The relative direction of the top surface 111 and the bottom surface 112 is a first direction Z, and the relative direction of the two side surfaces 113 is a second direction X. The first direction Z and the second direction X intersect.

[0034] Two external terminals 15 are positioned along the second direction X, and are spaced apart on the side of the bottom surface 112 away from the top surface 111. The ends of the two external terminals 15 that are away from each other also extend to the nearest side surface 113, and extend on the side surface 113 in a direction close to the top surface 111.

[0035] The height of the external terminal 15 along the first direction Z is H1, and the width of the external terminal 15 along the second direction X is W1, wherein 0.1≤H1 / W1≤0.35, for example H1 / W1=0.1, 0.15, 0.2, 0.25, 0.3 or 0.35.

[0036] The coil M13 is disposed within the body 11 and electrically connected to the external terminal 15. The coil M13 includes at least one inner electrode 13, the plane of which is parallel to the plane formed by the first direction Z and the second direction X. At least a portion of the inner electrode 13 extends between the external terminal 15 and the top surface 111.

[0037] In this application, on the plane where the inner electrode 13 is located, the two external terminals 15 are located on the bottom side. In this way, in order to reduce parasitic capacitance, only the bottom part of the inner electrode 13 needs to avoid the external terminals 15, and the rest of the inner electrode 13 can be as close as possible to the outline of the main body 11, thereby increasing the inner area.

[0038] Please combine Figure 2 , Figure 2 The horizontal axis represents the H1 / W1 ratio, and the vertical axis represents the Q value of the inductor at 0.5 GHz. It can be seen that when 0.1 ≤ H1 / W1 ≤ 0.35, the Q value is at a relatively high level. This is because: When the height H1 of the external terminal 15 along the first direction Z satisfies H1 / W1≤0.35, the height H1 of the external terminal 15 along the first direction Z is sufficiently small, providing a large space between the external terminal 15 and the top surface 111 for the inner electrode 13 to extend, which is beneficial for increasing the in-circuit area of ​​the inner electrode 13. Since the inductance is proportional to the in-circuit area of ​​the inner electrode 13, a larger in-circuit area of ​​the inner electrode 13 is beneficial for increasing the contribution of a single inner electrode 13 to the inductance. In this way, even without using a single-layer multi-turn wire group, the expected inductance can be easily achieved, thereby avoiding the Q-value degradation caused by proximity effect, so that the inductor element 1 has both a large inductance and a high Q-value.

[0039] Based on this, the ends of the two external terminals 15 furthest from each other extend to the nearest side 113, and extend along the direction close to the top surface 111 on the side 113, so that the main body 11 can be connected to the outside world (e.g., a circuit board) through the external terminals 15, the bottom surface 112, and the side 113, thereby further improving the installation stability of the inductor 1. Furthermore, the height H1 of the external terminals 15 along the first direction Z must satisfy 0.1 ≤ H1 / W1. At this time, the height H1 of the external terminals 15 on the side 113 along the first direction Z is still large enough to ensure a strong bonding force during installation of the external terminals 15, making them less likely to fall off.

[0040] In summary, when the height H1 of the external terminal 15 along the first direction Z satisfies 0.1≤H1 / W1≤0.35, the inductor 1 has both a large inductance and a high Q value, and the installation stability is good.

[0041] More specifically, the main body 11 is a hexahedron, and the main body 11 also has a front side 114 and a back side 115 arranged opposite to each other. The external terminal 15 has an L-shaped orthographic projection on the front side 114 of the main body 11.

[0042] In some embodiments, refer to Figure 3 On the side 113, the orthographic projection of the inner electrode 13 and the orthographic projection of the outer terminal 15 partially overlap, and the overlapping part is the overlapping region A.

[0043] The orthographic projection area of ​​a single inner electrode 13 on the side 113 is S1, and the area of ​​the overlapping region A of the single inner electrode 13 is S2, where S2 / S1 < 5.

[0044] When S2 / S1 < 5%, it indicates that when viewed from the side 113, the overlapping area A between the inner electrode 13 and the outer terminal 15 is small, which is beneficial for the inner electrode 13 to avoid the outer terminal 15. The non-overlapping part of the inner electrode 13 can be as close as possible to the outline of the main body 11, so that the inner electrode 13 can more easily obtain a larger inner area, thereby further improving the contribution of a single inner electrode 13 to the inductance, which is beneficial to improving the Q value.

[0045] Furthermore, the total number of internal electrodes 13 is n, where n×S2 < 700 square micrometers. n×S2 is, for example, 650 square micrometers, 550 square micrometers, or 450 square micrometers.

[0046] When n×S2<700 square micrometers, it indicates that when viewed from the side 113, the overlapping area A between the coil M13 and the external terminal 15 is small, and the non-overlapping part of the coil M13 can be as close as possible to the outline of the main body 11, so that the total area of ​​the coil M13 is larger, thereby further improving the inductance and Q value.

[0047] It should be noted that n is any positive integer, meaning the total number of inner electrodes 13 can be one or more layers. When there are multiple layers of inner electrodes 13, the stacking direction of the multiple inner electrodes 13 is the third direction Y, and the first direction Z, the second direction X, and the third direction Y are perpendicular to each other. Along the third direction Y, multiple inner electrodes 13 are sequentially connected to form a coil M13. Furthermore, the first and last layers of inner electrodes 13 are electrically connected to two external terminals 15, respectively.

[0048] Furthermore, please refer to the following: Figure 3 , Figure 4 and Figure 5The length of each overlapping region A along the first direction Z is L1, and the line width of the inner electrode 13 is W2, where L1 < W2.

[0049] When L1 < W2, it indicates that when viewed from the side 113, the length of the overlapping area A between the inner electrode 13 and the outer terminal 15 is relatively short, which is beneficial for the inner electrode 13 to avoid the outer terminal 15. The non-overlapping part of the inner electrode 13 can be as close as possible to the outline of the main body 11, so that the inner electrode 13 can more easily obtain a larger inner area, thereby further improving the contribution of a single inner electrode 13 to the inductance, which is beneficial to improving the Q value.

[0050] Figure 5 The horizontal axis represents the value of L1 / W2, and the vertical axis represents the Q value of the inductor at 0.5 GHz. It can be seen that when L1 / W2 is less than 1, that is, when L1 < W2, the Q value is at a relatively high level.

[0051] In some embodiments, referencing the back Figure 1 The inductor 1 also includes two internal terminals 12, which are spaced apart along the second direction X on the side of the bottom surface 112 facing the top surface 111, and each external terminal 15 is correspondingly disposed on the outside of each internal terminal 12.

[0052] Both the internal terminal 12 and the internal electrode 13 are disposed within the main body 11, allowing the internal terminal 12 to be printed together with the internal electrode 13. The internal terminal 12 and the internal electrode 13 are essentially integrally formed, ensuring good connection reliability between them. The external terminal 15 can be formed on the outside of the internal terminal 12 through electroplating. The internal electrode 13 connects to the external terminal 15 through the internal terminal 12, thereby improving the connection reliability between the external terminal 15 and the internal electrode 13.

[0053] See Figure 2 For the inductor to achieve a high Q value, the height H1 of the external terminal 15 along the first direction Z must also satisfy 0.1 ≤ H1 / W1. This is because the external terminal 15 is electroplated onto the body 11 based on the internal terminal 12. The height of the external terminal 15 is positively correlated with the height of the internal terminal 12. When the height H1 of the external terminal 15 along the first direction Z satisfies 0.1 ≤ H1 / W1, the height H1 of the external terminal 15 along the first direction Z is still relatively large, indicating that the height of the internal terminal 12 along the first direction Z is also relatively large. This means that the cross-sectional area of ​​the internal terminal 12 is larger, and the resistance of the internal terminal 12 is smaller, which helps to reduce the current transmission loss of the internal terminal 12 and thus achieve a higher Q value for the inductor 1.

[0054] Specifically, please refer to the following: Figure 1 and Figure 7When the inner electrode 13 is multi-layered, the multiple inner electrodes 13 are stacked and connected sequentially to form the coil M13. Along the stacking direction of the inner electrodes 13, the first inner electrode 13 is connected to one of the inner terminals 12, and the last inner electrode 13 is connected to another inner terminal 12. Current flows into the coil M13 sequentially through the outer terminal 15 and the inner terminal 12, and then flows out from the other inner terminal 12 and the other outer terminal 15, thus enabling the coil M13 to conduct.

[0055] More specifically, the inner electrode 13 is disposed on the insulating layer 14, which serves to separate adjacent inner electrode layers 13. Furthermore, the inner electrode 13 has an electrical connection portion 133, and the electrical connection portions 133 of two connected inner electrode layers 13 are electrically connected along the stacking direction of the inner electrode 13. Specifically, the insulating layer 14 has a conductive material below the electrical connection portion 133 to achieve electrical connection between the electrical connection portions 133 of the separated inner electrode layers 13.

[0056] Optionally, refer to Figure 1 The external terminal 15 comprises a nickel layer 151 and a tin layer 152 from the inside out, with the nickel layer 151 connecting the tin layer 152 and the internal terminal 12. The nickel, tin, and the material of the internal terminal 12 (e.g., silver or copper) all exhibit good adhesion, thereby enhancing the bonding strength between the tin layer 152 and the internal terminal 12 and reducing the risk of delamination. Furthermore, the tin layer 152 has good solderability, improving the bonding strength of the inductor element 1 after soldering.

[0057] The nickel layer 151 has a thickness of 1 micrometer to 5 micrometers, for example, 1 micrometer, 3 micrometers, or 5 micrometers. This thickness range effectively enhances the bonding force between the tin layer 152 and the internal terminal 12. The tin layer 152 has a thickness of 3 micrometers to 5 micrometers, for example, 3 micrometers, 4 micrometers, or 5 micrometers. This thickness range is sufficient to ensure strong bonding force after soldering the inductor element 1, but it is not too thick to avoid affecting the performance of the inductor element 1.

[0058] In some embodiments, refer to Figure 1 The inner electrode 13 includes side conductors 131. Each side conductor 131 extends between the inner terminal 12 and the top surface 111.

[0059] The side conductor 131 is the portion of the inner electrode 13 that extends between the outer terminal 15 and the top surface 111. Since the height H1 of the outer terminal 15 along the first direction Z is controlled to be H1 / W1≤0.35, the space between the outer terminal 15 and the top surface 111 is relatively large, providing ample space for the side conductor 131 to extend. The side conductor 131 will be relatively long along the first direction Z, resulting in a larger inner area of ​​the inner electrode 13 and thus increasing the contribution of a single inner electrode 13 to the inductance.

[0060] Furthermore, the external terminal 15 of this application does not extend to the top surface 111, so that the side wire 131 can be as close as possible to the top surface 111, which is beneficial to expanding the inner area of ​​the inner electrode 13.

[0061] Optionally, the side wire 131 extends along the first direction Z. In this case, the side wire 131 is in the shape of a straight strip to better fit the contour of the hexahedral body 11 and improve space utilization so that the coil M13 of the inner electrode 13 has a larger area.

[0062] Of course, the side guide 131 can also be a non-linear extension, for example, refer to Figure 6 (A) The side conductor 131 can also be a broken line. See reference. Figure 6 (B) The side conductor 131 may also include an arc-shaped portion.

[0063] Optionally, refer to Figure 1 Along the first direction Z, the length of the side conductor 131 is L2, and the height of the main body 11 is H2, satisfying the following relationship: 0.7 ≤ L2 / H2 ≤ 0.85. In this way, the length of the side conductor 131 is sufficiently long to effectively increase the in-circle area of ​​the inner electrode 13, thereby effectively improving the contribution of a single inner electrode 13 to the inductance. Furthermore, the length of the side conductor 131 is not excessive, thus leaving sufficient gap between the side conductor 131 and the external terminal 15, reducing parasitic capacitance, and thus reducing the impact of parasitic capacitance on the Q value, which is beneficial for improving the Q value of the inductor element 1.

[0064] Optionally, along the second direction X, the distance between each side conductor 131 and the nearest side 113 is D0, where 3 micrometers ≤ D0 ≤ 15 micrometers. D0 is, for example, 3 micrometers, 6 micrometers, 9 micrometers, 12 micrometers, or 15 micrometers.

[0065] When the condition 3 micrometers ≤ D0 ≤ 15 micrometers is met, each side conductor 131 is sufficiently close to the side surface 113 to maximize the inner area of ​​the inner electrode 13, thereby increasing the contribution of a single inner electrode 13 to the inductance. However, each side conductor 131 is still a certain distance from the side surface 113 to effectively avoid the inner electrode 13 being exposed due to cutting misalignment or damage to the main body 11, thereby reducing the risk of short circuit of the inner electrode 13.

[0066] Furthermore, referring to Figure 1 The inner electrode 13 also includes a lower side wire 132. The lower side wire 132 is connected to at least one side wire 131 near one end of the outer terminal 15. The lower side wire 132 extends at least partially along the upper profile 121 of the inner terminal 12, which is the profile of the inner terminal 12 facing the top surface 111.

[0067] In this way, the lower conductor 132 can maintain a suitable distance from the internal terminal 12 at each position, so as to improve the space utilization of the inner electrode 13, making the inner area of ​​the inner electrode 13 larger, and thus making the inductance of the inductor 1 larger and the Q value higher.

[0068] Furthermore, referring to Figure 1 The lower conductor 132 includes at least one first conductor segment 1321 and at least one second conductor segment 1322. Each first conductor segment 1321 is connected to one end of each side conductor 131 near the bottom surface 112 and extends along the second direction X near the center of the main body 11. Each second conductor segment 1322 is connected to one end of the first conductor segment 1321 near the center of the main body 11, and the second conductor segment 1322 is also bent relative to the first conductor segment 1321 and close to the bottom surface 112.

[0069] The first conductor segment 1321 extends approximately along the upper contour 121 of the internal terminal 12, while the second conductor segment 1322 extends toward the gap between the two internal terminals 12. This allows the lower conductor 132 to extend as close as possible along the upper contour 121 and to the bottom surface 112 between the two internal terminals 12, resulting in a larger inner area of ​​the inner electrode 13. This further enhances the contribution of a single inner electrode 13 to the inductance, and also reduces the parasitic capacitance between the inner electrode 13 and the internal terminal 12. Consequently, the inductance of the inductor element 1 is larger and the Q value is higher.

[0070] Optionally, the included angle α between the first conductor segment 1321 and the second conductor segment 1322 is greater than 180°, indicating that the second conductor segment 1322 turns downward and approaches the bottom surface 112 between the two internal terminals 12, so as to maximize the inner area of ​​the inner electrode 13, thereby increasing the contribution of the single inner electrode 13 to the inductance.

[0071] In this embodiment, along the second direction X, the ends of the two internal terminals 12 that are close to each other both have a chamfered profile 122.

[0072] The chamfered profile 122 can reduce the accumulation of tip charge. The included angle α between the first conductor segment 1321 and the second conductor segment 1322 is greater than 180°, which makes the second conductor segment 1322 set along the chamfered profile 122. This also helps to further expand the inner area of ​​the inner electrode 13, so as to further enhance the contribution of the single inner electrode 13 to the inductance.

[0073] Optionally, the radius of the chamfer profile 122 is r, where 10 micrometers ≤ r ≤ H1, to effectively reduce tip charge accumulation and effectively increase the in-circle area of ​​the inner electrode 13. Preferably, r = H1.

[0074] Furthermore, the electrical connection portion 133 is provided at the corner of the lower conductor 132 to ensure that the number of turns of the single-layer inner electrode 13 is sufficient. The corner of the lower conductor 132 is, for example, the connection point of the first conductor segment 1321 and the second conductor segment 1322, or the connection point of the second conductor segment 1322 and the third conductor segment 1323.

[0075] Furthermore, referring to Figure 1 The lower conductor 132 also includes a third conductor segment 1323, which is connected to at least one end of the second conductor segment 1322 near the bottom surface 112 and extends in the second direction X between the two internal terminals 12.

[0076] As analyzed above, since the second conductor segment 1322 bends downwards, the third conductor segment 1323 can just utilize the space between the two internal terminals 12. Since there is no conductor below the third conductor segment 1323, the third conductor segment 1323 can be as close as possible to the bottom surface 112, so that the lower wire 132 extends between the two internal terminals 12, which is beneficial to further increase the inner area of ​​the inner electrode 13, thereby further enhancing the contribution of the single inner electrode 13 to the inductance.

[0077] It is understood that the third conductor segment 1323 is the part of the inner electrode 13 that extends between the two internal terminals 12. Therefore, the orthographic projection of the third conductor segment 1323 and the orthographic projection of the internal terminal 12 partially overlap, and the overlapping part is the aforementioned overlapping area A.

[0078] Optionally, the distance between the third conductor segment 1323 and the bottom surface 112 is D1, satisfying the following relationship: 0.6 ≤ D1 / H1 ≤ 1.6. D1 / H1 can be, for example, 0.6, 0.8, 1, 1.2, 1.4, or 1.6. When the above relationship is satisfied, the in-circuit area of ​​the inner electrode 13 reaches a critical value, giving the inductor 1 a high Q value. Furthermore, a certain distance remains between the third conductor segment 1323 and the bottom surface 112 to effectively avoid exposure of the inner electrode 13 due to cutting misalignment or damage to the main body 11, thereby reducing the short-circuit risk of the inner electrode 13.

[0079] Optionally, the two internal terminals 12 are spaced apart along the second direction X with a spacing of D2. Along the second direction X, the narrowest distance between the third conductor segment 1323 and the internal terminals 12 is D3, satisfying the following relationship: 0.05 ≤ D3 / D2 ≤ 0.1, where D3 / D2 is, for example, 0.05, 0.06, 0.07, 0.08, 0.09, or 0.1. When the above relationship is satisfied, the parasitic capacitance between the internal terminals 12 and the internal electrode 13, as well as the in-circle area of ​​the internal electrode 13, reach a critical optimal value, giving the inductor element 1 a high Q value.

[0080] Furthermore, referring to Figure 1The inner electrode 13 also includes an upper side wire 134. Two side wires 131 are spaced apart along the second direction X, the upper side wire 134 extends along the second direction X, and the end of each side wire 131 near the top surface 111 is respectively connected to the end of the upper side wire 134 along the second direction X.

[0081] The upper conductor 134 and the two side conductors 131 on both sides form a shape similar to an unclosed square. The outline of the main body 11 is also square. The upper conductor 134 and the side conductors 131 extend along the outline of the main body 11 to improve the space utilization of the inner electrode 13, making the inner area of ​​the inner electrode 13 larger, thereby making the inductance of the inductor element 1 larger and the Q value higher.

[0082] It should be noted that since the inner electrode 13 is not a closed pattern (otherwise the inner electrode 13 would be short-circuited), the inner electrode 13 having an upper conductor 134, a side conductor 131, and a lower conductor 132 means that the projections of all inner electrodes 13 along the stacking direction of the inner electrodes 13 onto the insulating layer 14 will form as follows: Figure 1 The upper conductor 134, side conductor 131, and lower conductor 132 shown can each inner electrode 13 be selected from any part of the complete pattern composed of the upper conductor 134, side conductor 131, and lower conductor 132. For example, the inner electrode 13 may include the upper conductor 134, side conductor 131, and a portion of the lower conductor 132. The portion of the lower conductor 132 may refer to a lower conductor 132 lacking a third conductor segment 1323, a lower conductor 132 lacking a second conductor segment 1322, or a lower conductor 132 lacking a first conductor segment 1321.

[0083] Reference Figure 8 This application discloses an electronic device 100, which includes the inductor 1 in any of the above embodiments.

[0084] For example, electronic device 100 may be a mobile phone, pager, locator, wireless router, or Bluetooth headset. Inductor 1 may be disposed on a circuit board of electronic device 100.

[0085] 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 element, characterized in that, include: The main body has a top surface and a bottom surface that are arranged opposite to each other, and two side surfaces that are arranged opposite to each other. The relative direction of the top surface and the bottom surface is a first direction, and the relative direction of the two side surfaces is a second direction. The first direction and the second direction intersect. Two external terminals are spaced apart along the second direction on the side of the bottom surface opposite to the top surface, and the ends of the two external terminals away from each other extend to the nearest side surface, and extend along the side surface in a direction close to the top surface; the height of the external terminals along the first direction is H1, and the width of the external terminals along the second direction is W1, wherein 0.1 ≤ H1 / W1 ≤ 0.35; and A coil is disposed within the main body and electrically connected to the external terminal; the coil includes at least one inner electrode, the plane of which is parallel to the plane formed by the first direction and the second direction; at least a portion of the inner electrode extends between the external terminal and the top surface.

2. The inductor element according to claim 1, characterized in that, On the side surface, the orthographic projection of the inner electrode and the orthographic projection of the outer terminal partially overlap, and the overlapping part is the overlapping area. The orthographic projection area of ​​a single inner electrode on the side surface is S1, and the area of ​​the overlapping region of a single inner electrode is S2, wherein S2 / S1 < 5%.

3. The inductor element according to claim 2, characterized in that, The total number of internal electrodes is n, where n×S2 < 700 square micrometers.

4. The inductor element according to claim 1, characterized in that, On the side surface, the orthographic projection of the inner electrode and the orthographic projection of the outer terminal partially overlap, and the overlapping part is the overlapping area. The length of each overlapping region along the first direction is L1, and the linewidth of the inner electrode is W2, wherein L1 < W2.

5. The inductor element according to any one of claims 1 to 4, characterized in that, The inductor element also includes: Two internal terminals are spaced apart along the second direction on the side of the bottom surface facing the top surface, and each external terminal is correspondingly disposed on the outside of each internal terminal.

6. The inductor element according to claim 5, characterized in that, The internal electrode includes: Two side conductors are provided at intervals along the second direction, and each side conductor extends between the internal terminal and the top surface; An upper conductor, the upper conductor extending along the second direction, and one end of each of the side conductors near the top surface respectively connected to one end of the upper conductor along the second direction; and A lower side conductor is connected to one end of at least one of the side conductors near the external terminal. The lower side conductor extends at least partially along the upper profile of the internal terminal, the upper profile being the side profile of the internal terminal facing the top surface.

7. The inductor element according to claim 6, characterized in that, The lower conductor includes: At least one first conductor segment, each first conductor segment being connected to one end of each of the side conductors near the bottom surface and extending along the second direction near the center of the body; At least one second conductor segment, each second conductor segment being connected to one end of the first conductor segment near the center of the body, and the second conductor segment also being bent relative to the first conductor segment and close to the bottom surface; A third conductor segment is connected to at least one end of the second conductor segment near the bottom surface and extends along the second direction between the two internal terminals.

8. The inductor element according to claim 7, characterized in that, The distance between the third conductor segment and the bottom surface is D1, satisfying the following relationship: 0.6 ≤ D1 / H1 ≤ 1.6; and / or, The two internal terminals are spaced apart along the second direction with a spacing of D2; along the second direction, the narrowest distance between the third conductor segment and the internal terminals is D3, satisfying the following relationship: 0.05 ≤ D3 / D2 ≤ 0.1; and / or, The included angle α between the first conductor segment and the second conductor segment is greater than 180°; and / or, The inner electrode has an electrical connection portion, which is located at the corner of the lower conductor; and / or, The side guide wire extends along the first direction; wherein, along the first direction, the length of the side guide wire is L2, and the height of the main body is H2, satisfying the following relationship: 0.7 ≤ L2 / H2 ≤ 0.85; and / or, Along the second direction, the distance between each of the side conductors and the nearest side is D0, where 3 micrometers ≤ D0 ≤ 15 micrometers.

9. The inductor element according to claim 5, characterized in that, The external terminal comprises a nickel layer and a tin layer from the inside out, with the nickel layer connecting the tin layer and the internal terminal; The nickel layer has a thickness of 1 micrometer to 5 micrometers, and the tin layer has a thickness of 3 micrometers to 5 micrometers.

10. An electronic device, characterized in that, Including the inductor element as described in any one of claims 1 to 9.

Images