Inductor and electronic device

Abstract

The application discloses an inductor and an electronic device, the inductor comprising a substrate, an internal conductor and two external electrodes, the internal conductor being arranged in the substrate, the two external electrodes being arranged on two sides of the substrate in the length direction, each of the two external electrodes comprising a first part and a second part connected with each other, each of the first parts extending in the height direction and being electrically connected with the internal conductor, and each of the second parts extending in the length direction; the internal conductor having two first circumferential sides opposite in the length direction and a second circumferential side connected between the two first circumferential sides, the second circumferential side being arranged towards the second part, an inclined surface being formed at the connection between the second circumferential side and the first circumferential side, the distance between the first circumferential side and the first part in the length direction being e, the distance between the second circumferential side and the second part in the height direction being e, and 10 mu m <= e <= 25 mu m. By adopting the scheme, the self-resonant frequency of the inductor can be improved, and the Q value of the inductor can be improved.

Description

Technical Field

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

[0002] An inductor is an electronic component primarily used to store and release magnetic energy. It is widely used in various fields, such as communications, computers, and automobiles. A typical inductor usually consists of a frame, an internal coil, and two external terminals. The internal coil is housed within the frame and connected to the two external terminals. Both external terminals are mounted on the frame and at least partially exposed outside the frame. Both external terminals need to be soldered to external circuitry to serve as the connection points for the electrical connection between the internal coil and the external circuitry.

[0003] While increasing the inner diameter of the internal coil can result in a higher Q value (the ratio of inductive reactance to equivalent loss resistance when the inductor operates at an AC voltage at a certain frequency), it also presents other problems. For example, it can lead to an excessively small gap between the external terminals and the internal coil, resulting in a large parasitic capacitance between them. This can lead to a lower self-resonant frequency of the inductor, and may even cause the internal coil to come into contact with the external terminals at locations other than the connection point, potentially causing a short circuit in the inductor. Summary of the Invention

[0004] This invention discloses an inductor and an electronic device that can improve the self-resonant frequency and Q value of the inductor, thereby optimizing the product performance of the inductor.

[0005] To achieve the above objectives, in a first aspect, the present invention discloses an inductor comprising:

[0006] The substrate has a length direction, a width direction, and a height direction;

[0007] An inner conductor, the inner conductor being embedded within the substrate, the inner conductor being a wound conductor extending helically along the width direction; and

[0008] Two external electrodes are respectively disposed on both sides of the substrate in the length direction. Each external electrode includes a first part and a second part that are connected to each other. Each first part extends along the height direction and is electrically connected to a connection end. Each second part extends along the length direction.

[0009] The inner conductor has two first circumferential sides opposite each other along the length direction and a second circumferential side connected between the two first circumferential sides. The second circumferential side is disposed facing the second part, and an inclined surface is formed at the connection between the second circumferential side and the first circumferential side. The distance between the first circumferential side and the first part is e in the length direction, and the distance between the second circumferential side and the second part is e in the height direction, where 10μm≤e≤25μm.

[0010] As an optional implementation, in an embodiment of the first aspect of the invention, the first portion has a first end in the height direction and away from the second portion, and the projection of the first end on the inner conductor is located within the first circumferential side surface.

[0011] The second portion has a second end in the length direction and away from the first portion, and the projection of the second end on the inner conductor is located within the second circumferential side.

[0012] As an optional implementation, in an embodiment of the first aspect of the present invention, the inclined surface and the first peripheral surface intersect to form a first intersecting line, the first portion having a first side facing the inner conductor and a first end face facing away from the second portion, the distance between the first side and the first intersecting line in the length direction is e, and the distance between the first end face and the first intersecting line in the height direction is k, 0 μm < k ≤ 25 μm.

[0013] As an optional implementation, in an embodiment of the first aspect of the present invention, the inclined surface and the second peripheral side intersect to form a second intersecting line, the second portion has a second side facing the inner conductor and a second end face facing away from the first portion, the distance between the second side and the second intersecting line in the height direction is e, and the second end face and the second side intersect to form a third intersecting line, the third intersecting line being located in the extended surface of the inclined surface.

[0014] As an alternative implementation, in an embodiment of the first aspect of the invention, each of the connection ends extends to be electrically connected to a first side.

[0015] As an optional implementation, in an embodiment of the first aspect of the present invention, the length of the substrate in the length direction is L, the width of the substrate in the width direction is W, and the height of the substrate in the height direction is T, where 0.2mm≤L≤0.4mm, 0.05mm≤W≤0.2mm, and 0.1mm≤T≤0.3mm.

[0016] As an optional implementation, in an embodiment of the first aspect of the invention, the inner conductor further has a third circumferential side opposite to the second circumferential side, the third circumferential side being connected between the two first circumferential sides, and the connection between the third circumferential side and the first circumferential side forming a smooth transition.

[0017] As an optional implementation, in an embodiment of the first aspect of the present invention, the internal conductor includes multiple layers of electrode layers stacked at intervals along the width direction, each electrode layer being shaped as an open ring, and any two adjacent electrode layers being electrically connected to each other and connected in series to form a spirally extending wound conductor.

[0018] The electrode layers located at both ends of the inner conductor along the width direction each have a connection end. The multiple electrode layers form one first circumferential side surface on one side of the length direction, the multiple electrode layers form another first circumferential side surface on the other side of the length direction, and the multiple electrode layers form a second circumferential side surface on the side of the multiple electrode layers facing the second portion in the height direction.

[0019] As an optional implementation, in an embodiment of the first aspect of the present invention, each of the electrode layers includes multiple sub-electrode layers stacked at intervals along the width direction, each of the sub-electrode layers is in the shape of an open ring, and each of the sub-electrode layers has two sub-ends.

[0020] In the electrode layer located at the middle of the inner conductor in the width direction, the sub-ends of the multiple sub-electrode layers are sequentially electrically connected in the width direction;

[0021] In the electrode layers located at both ends of the inner conductor in the width direction, one of the sub-ends of the multiple sub-electrode layers constitutes the connection end, and the other sub-ends of the multiple sub-electrode layers are sequentially electrically connected in the width direction.

[0022] In a second aspect, the present invention discloses an electronic device having an inductor as described in the first aspect above.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0024] The inductor and electronic device provided in this invention, by forming an inclined surface on the inner conductor near the outer electrode, compared to a right angle design, increases the distance between the inner conductor and the outer electrode. This distance is controlled within the range of 10μm-25μm, preventing the spacing from becoming too small. This effectively suppresses parasitic capacitance between the inner and outer electrodes, reducing it and thus increasing the inductor's self-resonant frequency and Q-value, optimizing its performance. Furthermore, it prevents short circuits caused by electrical contact between the inner conductor and the outer electrode at locations other than the connection point, improving the inductor's safety and ensuring normal operation. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the structure of the inductor disclosed in an embodiment of the present invention;

[0027] Figure 2 yes Figure 1 A cross-sectional view of the inductor along the AA direction;

[0028] Figure 3 This is a linear curve of the Q value of the inductor disclosed in the embodiments of the present invention as a function of the distance between the internal conductor and the external electrode;

[0029] Figure 4 This is a linear curve showing the change of the self-resonant frequency of the inductor disclosed in the embodiments of the present invention as a function of the distance between the internal conductor and the external electrode;

[0030] Figure 5 This is a schematic diagram of the structure of an inductor disclosed in an embodiment of the present invention when the substrate is not shown;

[0031] Figure 6 This is a three-dimensional structural diagram of an inductor without a substrate, as disclosed in an embodiment of the present invention.

[0032] Figure 7 This is a three-dimensional structural schematic diagram of the inductor disclosed in the embodiments of the present invention when the substrate is not shown;

[0033] Figure 8This is a schematic diagram of the structure of the electronic device disclosed in the embodiments of the present invention.

[0034] Explanation of main figure symbols

[0035] 100-Inductor; 11-Substrate; 12-Internal conductor; 12a-Electrode layer; 12a1-Sub-electrode layer; 121-Connection terminal; 121a-Sub-end terminal; 122-First peripheral side; 123-Second peripheral side; 124-Inclined surface; 125-First intersection line; 126-Second intersection line; 127-Third peripheral side; 13-External electrode; 131-First part; 131a-First end; 1311-First side; 1312-First end face; 132-Second part; 132a-Second end; 1321-Second side; 1322-Second end face; 1323-Third intersection line;

[0036] f1 - Length direction; f2 - Width direction; f3 - Height direction;

[0037] 200 - Electronic devices. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0040] It is understood that the term "connection" in the following embodiments should be understood as "electrical connection," "communication connection," etc., if the connected circuits, modules, units, etc., have electrical signal or data transmission with each other.

[0041] When used herein, the singular forms of “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising / including” or “having,” etc., specify the presence of the stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. Meanwhile, the term “and / or” as used in this specification includes any and all combinations of the associated listed items.

[0042] Please see Figure 1 and Figure 2This invention discloses an inductor 100, which includes a substrate 11, an internal conductor 12, and two external electrodes 13. The internal conductor 12 is embedded in the substrate 11 and is a spirally wound conductor extending along the width direction f2. The internal conductor 12 has two connection ends 121. The two external electrodes 13 are respectively disposed on both sides of the substrate 11 in the length direction f1. Each external electrode 13 is electrically connected to one connection end 121 of the internal conductor 12, and each external electrode 13 is partially exposed outside the substrate 11 for electrical connection with an external circuit, thereby facilitating the electrical connection between the internal conductor 12 and the external circuit. That is, the external electrode 13 is an electrode that realizes the lead-out function. For example, each external electrode 13 may include a first portion 131 and a second portion 132 that are interconnected, each first portion 131 extending along the height direction f3 and each first portion 131 being electrically connected to a connection end 121 of the internal conductor 12, and each second portion 132 extending along the length direction f1.

[0043] In this application, the substrate 11 surrounds the inner conductor 12 to isolate it from the external environment, primarily serving an insulating function. Furthermore, the substrate 11 can be formed from an insulating material, such as ceramic or resin, providing mechanical and insulating properties to the inductor 100. The substrate 11 has a length direction f1, a width direction f2, and a height direction f3, such as... Figure 1 and Figure 2 As shown, the length direction f1 can be the x-axis direction in a rectangular coordinate system; the width direction f2 can be the y-axis direction in a rectangular coordinate system; and the height direction f3 can be the z-axis direction in a rectangular coordinate system. At this time, the length direction f1, the width direction f2, and the height direction f3 are perpendicular to each other, and the first part 131 and the second part 132 are perpendicularly connected, so the external electrode 13 can be roughly L-shaped.

[0044] In this application, for ease of description, such as Figure 1 As shown, the length of the substrate 11 in the length direction f1 is set to L, the width of the substrate 11 in the width direction f2 is set to W, and the height of the substrate 11 in the height direction f3 is set to T, where 0.2mm≤L≤0.4mm, 0.05mm≤W≤0.2mm, and 0.1mm≤T≤0.3mm. In other words, according to... Figure 1When the dimensions L, W, and T are represented by L×W×T, the inductor 100 in this application can take the form of 0.4mm×0.2mm×0.2mm, 0.4mm×0.2mm×0.3mm, 0.4mm×0.2mm×0.3mm, 0.4mm×0.2mm×0.25mm, 0.4mm×0.2mm×0.15mm, 0.4mm×0.2mm×0.1mm, 0.25mm×0.125mm×0.2mm, etc. That is, the inductor 100 in this application can be an inductor product of metric 0402 size and below, for example, the inductor 100 in this application can be an inductor product of metric 0402 size or metric 0201 size.

[0045] Because the inductor 100 in this application is a metric 0402 size or smaller inductor product, its volume is relatively small. After increasing the inner diameter of the internal coil, other problems are likely to be encountered. For example, it may cause the distance between the external electrode 13 and the internal conductor 12 to be too small, which will result in a relatively large parasitic capacitance between the external electrode 13 and the internal conductor 12. This will lead to a low self-resonant frequency of the inductor 100, and may even cause the internal conductor 12 to contact the external terminal except for the connection terminal 121 connected to the external electrode 13, which may lead to a short circuit in the inductor 100.

[0046] In view of this, this application forms an inclined surface 124 near the external electrode 13 on the internal conductor 12. Compared to a design where the internal conductor 12 is at a right angle near the external electrode 13, this increases the distance between the internal conductor 12 and the external electrode 13, while controlling the distance between them within the range of 10μm-25μm. This avoids the spacing between the internal conductor 12 and the external electrode 13 being too small, thus effectively suppressing the parasitic capacitance generated between them. This reduces the parasitic capacitance, thereby increasing the self-resonant frequency and Q value of the inductor 100, and optimizing its performance. Furthermore, it avoids short circuits caused by electrical contact between the internal conductor 12 and the external electrode 13 at locations other than the connection terminal 121, which connects to the external electrode 13. This improves the safety of the inductor 100 and ensures its normal operation.

[0047] Specifically, such as Figure 1 and Figure 2As shown, in this embodiment of the application, the internal conductor 12 has two opposing first peripheral side surfaces 122 along the length direction f1 and a second peripheral side surface 123 connected between the two first peripheral side surfaces 122. The second peripheral side surface 123 is disposed facing the second portion 132, and an inclined surface 124 is formed at the connection between the second peripheral side surface 123 and the first peripheral side surface 122. That is, the inclined surface 124 is formed at the position of the internal conductor 12 near the external electrode 13. Compared with the design of forming a right angle at the position of the internal conductor 12 near the external electrode 13, this can increase the distance between the internal conductor 12 and the external electrode 13.

[0048] Meanwhile, in this application, the distance between the first circumferential side 122 and the first part 131 in the length direction f1 is e, and the distance between the second circumferential side 123 and the second part 132 in the height direction f3 is e, 10μm≤e≤25μm, preferably 15μm≤e≤20μm, for example e=15μm, 16μm, 17μm, 18μm, 19μm or 20μm, etc. In other words, by controlling the distance between the internal conductor 12 and the external electrode 13 within the range of 10μm-25μm, the gap between the internal conductor 12 and the external electrode 13 is avoided from being too small. This effectively suppresses the parasitic capacitance generated between the internal conductor 12 and the external electrode 13, reduces the parasitic capacitance generated between the internal conductor 12 and the external electrode 13, thereby increasing the self-resonant frequency of the inductor 100 and improving the Q value (quality factor) of the inductor 100, thus optimizing the product performance of the inductor 100. In addition, it also avoids short circuits caused by contact electrical connection between the internal conductor 12 and the external electrode 13 at locations other than the connection terminal 121 connected to the external electrode 13, thereby improving the safety of the inductor 100 and ensuring its normal operation.

[0049] To verify that when an inclined surface 124 is formed near the external electrode 13 on the internal conductor 12, and e is within the aforementioned range, both the Q value and self-resonant frequency of the inductor 100 can be simultaneously improved, this application conducted simulation verification of the inductor 100 with different values ​​for the distance (i.e., e) between the internal conductor 12 and the external electrode 13. The test results are as follows: Figure 3 and Figure 4 As shown. From Figure 3 As can be seen from this, the larger the distance e between the internal conductor 12 and the external electrode 13, the lower the Q value of the inductor 100; and from Figure 4As can be seen, the greater the distance e between the internal conductor 12 and the external electrode 13, the higher the self-resonant frequency of the inductor 100. When e is in the range of 10μm-25μm, the Q value of the inductor 100 can be stabilized above 19GHz, and the self-resonant frequency of the inductor 100 can be stabilized above 9.3GHz. It can be seen that the inductor 100 provided in this application embodiment can simultaneously take into account the characteristics of high Q value and high self-resonant frequency.

[0050] Among them, the Q value of inductor 100 is the quality factor of inductor 100. It is the main parameter used to measure inductor 100. It refers to the ratio of inductive reactance to equivalent loss resistance when inductor 100 is working with AC voltage at a certain frequency. The higher the Q value of inductor 100, the lower its loss and the higher its efficiency.

[0051] The internal conductor 12 in this application can be made of conductive materials, such as silver (Ag), copper (Cu), gold (Au), etc. The internal conductor 12 mainly serves to conduct electricity for the inductor 100. The external electrode 13 in this application can also be made of conductive materials, and can generally be composed of three materials: the innermost layer is made of the same material as the internal conductor 12, which is located inside the substrate 11; nickel (Ni) is used as the middle layer; and tin (Sn) is used as the outermost layer, which is located outside the substrate 11. The external electrode 13 mainly serves to weld to the external circuit.

[0052] In some embodiments, such as Figure 5 As shown, the first portion 131 has a first end 131a in the height direction f3 and away from the second portion 132. The projection of this first end 131a onto the inner conductor 12 is located within the first peripheral side surface 122. This allows at least a portion of the first peripheral side surface 122 of the inner conductor 12 to correspond to the first portion 131 of the outer electrode 13, thereby enabling the inner conductor 12 to use the first portion 131 of the outer electrode 13 as a reference to correct its shape. This, in turn, ensures that the inner conductor 12 is less prone to reliability failure, thus achieving excellent quality and performance.

[0053] Similarly, the second portion 132 has a second end 132a in the length direction f1 and away from the first portion 131. The projection of this second end 132a onto the inner conductor 12 is located within the second peripheral side surface 123. This allows at least a portion of the second peripheral side surface 123 of the inner conductor 12 to correspond to the second portion 132 of the outer electrode 13, thereby enabling the inner conductor 12 to use the second portion 132 of the outer electrode 13 as a reference to correct its shape. This, in turn, ensures that the inner conductor 12 is less prone to reliability failure, thus achieving excellent quality and performance.

[0054] In some embodiments, such as Figure 5 As shown, the inclined surface 124 and the first peripheral side surface 122 intersect to form a first intersecting line 125. The first part 131 has a first side surface 1311 facing the inner conductor 12 and a first end surface 1312 facing away from the second part 132. In the length direction f1, the distance between the first side surface 1311 and the first intersecting line 125 is e, that is, the distance between the first side surface 1311 and the first intersecting line 125 in the length direction f1 is in the range of 15μm-20μm. Furthermore, in the height direction f3, the distance between the first end face 1312 and the first intersecting line 125 is k, where 0μm < k ≤ 25μm, preferably 0μm < k ≤ 20μm, for example, k = 1μm, 2μm, 3μm, 4μm, 5μm, 6μm, 7μm, 8μm, 9μm, 10μm, 11μm, 12μm, 13μm, 14μm, 15μm, 16μm, 17μm, 18μm, 19μm or 20μm, etc. By using the above-mentioned distance design, it is possible to avoid the spacing between the inner conductor 12 and the outer electrode 13 being too small, thereby improving the self-resonant frequency and Q value of the inductor 100. At the same time, it is possible to ensure that at least a portion of the first peripheral side 122 of the inner conductor 12 can correspond to the first portion 131 of the outer electrode 13. This allows the inner conductor 12 to use the first portion 131 of the outer electrode 13 as a reference to correct the shape of the inner conductor 12, thereby improving the yield of the inner conductor 12.

[0055] In some embodiments, such as Figure 5 As shown, the inclined surface 124 and the second peripheral side surface 123 intersect to form a second intersecting line 126. The second part 132 has a second side surface 1321 facing the inner conductor 12 and a second end surface 1322 facing away from the first part 131. In the height direction f3, the distance between the second side surface 1321 and the second intersecting line 126 is e, that is, the distance between the second side surface 1321 and the second intersecting line 126 in the height direction f3 is in the range of 15μm-20μm. Moreover, the second end surface 1322 and the second side surface 1321 intersect to form a third intersecting line 1323. The third intersecting line 1323 is located in the extended surface of the inclined surface 124, that is, the extended surface of the inclined surface 124 passes through the third intersecting line 1323. Through the above design, it is possible to avoid the spacing between the internal conductor 12 and the external electrode 13 being too small, thereby improving the self-resonant frequency and Q value of the inductor 100. At the same time, it is possible to ensure that at least a portion of the second peripheral side 123 of the internal conductor 12 corresponds to the second portion 132 of the external electrode 13. This allows the internal conductor 12 to use the second portion 132 of the external electrode 13 as a reference to correct the shape of the internal conductor 12, thereby improving the yield of the internal conductor 12.

[0056] In some embodiments, such as Figure 5As shown, the inner conductor 12 also has a third circumferential side 127 opposite to the second circumferential side 123. The third circumferential side 127 is connected between the two first circumferential side 122, and the connection between the third circumferential side 127 and the first circumferential side 122 forms a smooth transition. For example, a rounded corner or chamfer is provided at the connection between the third circumferential side 127 and the first circumferential side 122. This can avoid the formation of sharp corners at the connection between the third circumferential side 127 and the first circumferential side 122, and avoid stress concentration at the connection (corner) of the third circumferential side 127 and the first circumferential side 122. The stress can be mitigated, and cracks or fissures are suppressed at the corners of the inner conductor 12. This can prevent the stress from being too concentrated at the connection between the third circumferential side 127 and the first circumferential side 122, which could lead to cracks or fissures, thereby improving the reliability of the inner conductor 12.

[0057] In some embodiments, such as Figure 6 and Figure 7 As shown, each connection end 121 of the internal conductor 12 extends to be electrically connected to a first side 1311. In practical design, the first end face 1312 is generally a surface parallel to the thickness direction of the first part 131, while the first side face 1311 is generally a surface perpendicular to the thickness direction of the first part 131. Therefore, the area of ​​the first end face 1312 is generally smaller than the area of ​​the first side face 1311. If each connection end 121 of the internal conductor 12 extends to be electrically connected to a first end face 1312, the connection area between the internal conductor 12 and the external electrode 13 will be small due to the relatively small area of ​​the first end face 1312, affecting the connection strength between the internal conductor 12 and the external electrode 13. Therefore, in this application, each connection end 121 of the internal conductor 12 extends to be electrically connected to a first side face 1311. Since the area of ​​the first side face 1311 is relatively large, it can provide a relatively wide connection position for the connection end 121, thereby increasing the connection area between the connection end 121 and the first part 131, and thus improving the connection strength between the internal conductor 12 and the external electrode 13.

[0058] In this application, the inner conductor 12 is annular and symmetrically arranged about the length direction f1 of the substrate 11 when viewed from the width direction f2 of the substrate 11.

[0059] Optionally, combined Figure 6 and Figure 7As shown, the internal conductor 12 in this application may include multiple electrode layers 12a stacked at intervals along the width direction f2, such as two electrode layers 12a, three electrode layers 12a, four electrode layers 12a, five electrode layers 12a, or more electrode layers 12a. Each electrode layer 12a is shaped as an open ring, and any two adjacent electrode layers 12a are electrically connected to each other to form a spirally extending wound conductor. The electrode layers 12a at both ends along the width direction f2 of the internal conductor 12 each have a connection end 121 provided in the aforementioned embodiment to be electrically connected to the first side surface 1311 of the first part 131. One side surface of the multiple electrode layers 12a in the length direction f1 constitutes one of the first peripheral side surfaces 122 provided in the aforementioned embodiment, and the other side surface of the multiple electrode layers in the length direction f1 constitutes another first peripheral side surface 122 provided in the aforementioned embodiment. The side surface of the multiple electrode layers in the height direction f3 facing the second part constitutes the second peripheral side surface 123 provided in the aforementioned embodiment. The internal conductor 12 adopts the above-described structural design, which facilitates the formation of a spiral conductor extending in a spiral shape along the width direction f2, and makes the processing and manufacturing of the internal conductor 12 convenient.

[0060] In some embodiments, combined with Figure 6 and Figure 7As shown, each electrode layer 12a may include multiple sub-electrode layers 12a1 stacked at intervals along the width direction f2, such as two sub-electrode layers 12a1, three sub-electrode layers 12a1, four sub-electrode layers 12a1, five sub-electrode layers 12a1, or more sub-electrode layers 12a1. Each sub-electrode layer 12a1 is shaped like an open ring, and each sub-electrode layer 12a1 has two sub-ends 121a located in the inner conductor 12 along the width direction f2. In the middle electrode layer 12a of the upper part, the sub-ends 121a of the multiple sub-electrode layers 12a1 are sequentially electrically connected in the width direction f2. That is, in the electrode layer 12a located in the middle part of the inner conductor 12 in the width direction f2, one sub-end 121a of the multiple sub-electrode layers 12a1 in each electrode layer 12a is sequentially electrically connected in the width direction f2, and the other sub-end 121a of the multiple sub-electrode layers 12a1 in each electrode layer 12a is also in the width direction f2. 2. The electrodes 12a at both ends of the inner conductor 12 along the width direction f2 are electrically connected in sequence. In the electrode layers 12a at both ends of the inner conductor 12 along the width direction f2, one of the sub-ends 121a of the multi-layer sub-electrode layer 12a1 constitutes the connection end 121 provided in the aforementioned embodiment, and the other sub-ends 121a of the multi-layer sub-electrode layer 12a1 are electrically connected in sequence along the width direction f2. That is, in the electrode layer 12a at one end of the inner conductor 12 along the width direction f2, one of the sub-ends 121a of the multi-layer sub-electrode layer 12a1 constitutes a connection end 121 provided in the aforementioned embodiment, and the other sub-ends 121a of the multi-layer sub-electrode layer 12a1 are electrically connected in sequence along the width direction f2. In the electrode layer 12a at the other end of the inner conductor 12 along the width direction f2, one of the sub-ends 121a of the multi-layer sub-electrode layer 12a1 constitutes another connection end 121 provided in the aforementioned embodiment, and the other sub-ends 121a of the multi-layer sub-electrode layer 12a1 are electrically connected in sequence along the width direction f2.

[0061] By making each electrode layer 12a include multiple sub-electrode layers 12a1 stacked at intervals along the width direction f2, the resistance value (RDC) of the inductor 100 under DC can be reduced, and more inductance can be obtained with fewer electrode layers 12a, thus reducing the production cost of the inductor 100.

[0062] In this embodiment, one side of the multilayer sub-electrode layer 12a1 in the multilayer electrode layer 12a along the length direction f1 constitutes one of the first peripheral side surfaces 122 provided by the aforementioned embodiment, the other side of the multilayer sub-electrode layer 12a1 in the multilayer electrode layer 12a along the length direction f1 constitutes another first peripheral side surface 122 provided by the aforementioned embodiment, and the side of the multilayer sub-electrode layer 12a1 in the multilayer electrode layer 12a along the height direction f3 and facing the second portion 132 constitutes the second peripheral side surface 123 provided by the aforementioned embodiment.

[0063] Please see Figure 8 This invention also discloses an electronic device having an inductor 100 as provided in any of the foregoing embodiments of this application. It is understood that since the electronic device 200 provided in this application includes the inductor 100 of the above embodiments, the electronic device 200 provided in this application has all the beneficial effects of the inductor 100. For details, please refer to the description of the inductor 100 in the above embodiments, which will not be repeated here.

[0064] Optionally, the electronic device 200 may be, but is not limited to, a mobile phone, tablet computer, laptop computer, desktop computer, smart TV, wearable device (such as smartwatch or smart bracelet), etc. The embodiments of this application do not limit the type of electronic device 200.

[0065] 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.

[0066] Furthermore, the embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the content of this specification should not be construed as a limitation of this application, and the protection scope of this application should be determined by the appended claims.

Claims

1. An inductor, characterized in that, include: The substrate has a length direction, a width direction, and a height direction; An inner conductor, embedded within the substrate, wherein the inner conductor is a spirally wound conductor extending along the width direction, and having two connecting ends; and Two external electrodes are respectively disposed on both sides of the substrate in the length direction. Each external electrode includes a first part and a second part that are connected to each other. Each first part extends along the height direction and is electrically connected to a connection end. Each second part extends along the length direction. The inner conductor has two first circumferential sides opposite each other along the length direction and a second circumferential side connected between the two first circumferential sides. The second circumferential side is disposed facing the second part, and an inclined surface is formed at the connection between the second circumferential side and the first circumferential side. In the length direction, the distance between the first circumferential side and the first part is e, and in the height direction, the distance between the second circumferential side and the second part is e, where 10μm≤e≤25μm. The inclined surface and the second peripheral side intersect to form a second intersecting line. The second part has a second side facing the inner conductor and a second end face facing away from the first part. In the height direction, the distance between the second side and the second intersecting line is e. In the length direction, the distance between the two second intersecting lines is greater than the distance between the two second end faces, and both second end faces are located between the two second intersecting lines.

2. The inductor according to claim 1, characterized in that, The first portion has a first end in the height direction and away from the second portion, the projection of the first end on the inner conductor being located within the first circumferential side surface; The second portion has a second end in the length direction and away from the first portion, and the projection of the second end on the inner conductor is located within the second circumferential side.

3. The inductor according to claim 2, characterized in that, The inclined surface and the first peripheral side intersect to form a first intersecting line. The first portion has a first side facing the inner conductor and a first end face facing away from the second portion. In the length direction, the distance between the first side and the first intersecting line is e. In the height direction, the distance between the first end face and the first intersecting line is k, where 0 μm < k ≤ 25 μm.

4. The inductor according to claim 2, characterized in that, The second end face and the second side face intersect to form a third intersection line, which is located within the extended surface of the inclined surface.

5. The inductor according to claim 2, characterized in that, Each of the connection terminals extends to be electrically connected to one of the first sides.

6. The inductor according to claim 1, characterized in that, The length of the substrate in the length direction is L, the width of the substrate in the width direction is W, and the height of the substrate in the height direction is T, where 0.2mm≤L≤0.4mm, 0.05mm≤W≤0.2mm, and 0.1mm≤T≤0.3mm.

7. The inductor according to any one of claims 1-6, characterized in that, The inner conductor also has a third circumferential side opposite to the second circumferential side, the third circumferential side being connected between the two first circumferential sides, and the connection between the third circumferential side and the first circumferential side forming a smooth transition.

8. The inductor according to any one of claims 1-6, characterized in that, The internal conductor includes multiple electrode layers stacked at intervals along the width direction. Each electrode layer is shaped as an open ring, and any two adjacent electrode layers are electrically connected to each other to form a spirally extending wound conductor in series. The electrode layers located at both ends of the inner conductor along the width direction each have a connection end. The multiple electrode layers form one first circumferential side surface on one side of the length direction, the multiple electrode layers form another first circumferential side surface on the other side of the length direction, and the multiple electrode layers form a second circumferential side surface on the side of the multiple electrode layers facing the second portion in the height direction.

9. The inductor according to claim 8, characterized in that, Each of the electrode layers includes multiple sub-electrode layers stacked at intervals along the width direction, each of the sub-electrode layers is in the shape of an open ring, and each of the sub-electrode layers has two sub-ends; In the electrode layer located at the middle of the inner conductor in the width direction, the sub-ends of the multiple sub-electrode layers are sequentially electrically connected in the width direction; In the electrode layers located at both ends of the inner conductor in the width direction, one of the sub-ends of the multiple sub-electrode layers constitutes the connection end, and the other sub-ends of the multiple sub-electrode layers are sequentially electrically connected in the width direction.

10. An electronic device, characterized in that, The electronic device has an inductor as described in any one of claims 1-9.

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