Coil electrode layer and laminated inductor element

Abstract

The present application relates to the technical field of inductor components, and in particular to a coil electrode layer and a laminated inductor element. The coil electrode layer comprises: an insulating substrate, having a first surface; an inner coil electrode, arranged on the first surface and wound in a rectangular pattern; and an outer coil electrode, arranged on the first surface and wound in a rectangular pattern, wherein one end of the outer coil electrode is connected to one end of the inner coil electrode, and the outer coil electrode is arranged around the inner coil electrode; in a first direction, a spacing W0 is provided between the outer coil electrode and the inner coil electrode, and the first direction is parallel to a first side of the outer coil electrode; the inner coil electrode has a first electrical connection end arranged away from the outer coil electrode, and the outer coil electrode has a second electrical connection end arranged away from the inner coil electrode; and the widths of the inner coil electrode and the outer coil electrode are both WC, and the spacing between the first electrical connection end and the second electrical connection end in the first direction is W1, wherein W1≥WC+2W0. In this way, the load reliability of a product can be improved, the occurrence of short circuit when the product is loaded can be prevented, and an inductance value can be increased.

Description

Coil electrode layer and multilayer inductor

[0001] Cross-reference to related applications

[0002] This application claims priority to Chinese Patent Application No. 2024118875726, filed on December 20, 2024, entitled “Coil Electrode Layer and Multilayer Inductor Element”, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of inductor technology, and in particular to a coil electrode layer and a multilayer inductor element. Background Technology

[0004] With the application of 5G and the research and development of 6G, the communications industry is constantly moving towards higher frequencies, which inevitably places higher demands on the reliability of electronic components at high frequencies. In inductor components, the shape and size design of the internal electrodes have a direct impact on their reliability.

[0005] Generally speaking, the single-layer coil of the internal electrode of an inductor is usually less than a full turn. This requires a large number of layers to obtain a large inductance value with multiple turns. However, due to the product thickness limitation, there are certain requirements for the number of internal electrode layers. Therefore, it is necessary to increase the number of turns of the single-layer coil. However, the single-layer multi-turn design often has the risk of short circuit.

[0006] Therefore, how to design inductor components that are small in size, have high inductance, and have high load reliability is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0007] This application discloses a coil electrode layer and a multilayer inductor element, which can improve the load reliability of the product, prevent short circuits after the product is loaded, and increase the inductance value.

[0008] To achieve the above objectives, in a first aspect, embodiments of this application disclose a coil electrode layer applied to a multilayer inductor element, comprising:

[0009] An insulating substrate having a first surface;

[0010] Inner ring electrode, the inner ring electrode is disposed on the first surface and coiled along a rectangle;

[0011] An outer ring electrode is disposed on the first surface and coiled along a rectangle. One end of the outer ring electrode is connected to one end of the inner ring electrode and is disposed around the inner ring electrode. Along a first direction, there is a distance W0 between the outer ring electrode and the inner ring electrode. The first direction is parallel to the first side of the outer ring electrode.

[0012] The inner ring electrode has a first electrical connection terminal located away from the outer ring electrode, and the outer ring electrode has a second electrical connection terminal located away from the inner ring electrode.

[0013] The width of both the inner and outer electrodes is W. C The distance between the first electrical connection terminal and the second electrical connection terminal in the first direction is W1, where W1 ≥ W C +2W0.

[0014] In one alternative embodiment, W1 ≥ 2W C +2W0.

[0015] Secondly, this application provides a multilayer inductor element, comprising:

[0016] The first lead-out layer is used to connect to the first terminal block;

[0017] The second lead-out layer is used to connect to the second terminal block;

[0018] An internal electrode assembly is disposed between the first lead-out layer and the second lead-out layer;

[0019] The internal electrode assembly includes multiple internal electrode layers that are stacked and connected sequentially along its own thickness direction.

[0020] At least one of the plurality of inner electrode layers is the aforementioned coil electrode layer, and / or at least one of the first lead-out layer and the second lead-out layer is the aforementioned coil electrode layer.

[0021] Compared with related technologies, the beneficial effects of this application are:

[0022] The coil electrode layer of this application includes an inner coil electrode and an outer coil electrode. That is, the number of turns of a single layer of the coil electrode is greater than one turn. Thus, with the same number of electrode layers, the number of electrode turns of the coil electrode layer can be increased, thereby increasing the inductance of the inductor using the coil electrode layer of this application.

[0023] Furthermore, the distance between the first electrical connection terminal of the inner ring electrode and the second electrical connection terminal of the outer ring electrode in the first direction is W1, and the width of the coil electrode layer is W. C The distance between the inner and outer electrodes is W0, and W1 ≥ W C+2W0, which allows the first electrical connection terminal and the second electrical connection terminal to be separated by a large distance in the first direction, thus making the straight-line distance between the first electrical connection terminal and the second electrical connection terminal larger. In this way, even if a crack occurs when a through hole is opened on the insulating substrate to which the coil electrode layer is attached, corresponding to the position of the first electrical connection terminal or the second electrical connection terminal, the risk of the crack extending to the position on the insulating substrate corresponding to the second electrical connection terminal or the first electrical connection terminal can be reduced. This prevents the second electrical connection terminal or the first electrical connection terminal from directly contacting the coil electrode layer located below the coil electrode layer, thereby reducing the risk of load short circuit. Attached Figure Description

[0024] Figure 1 is a schematic diagram of the structure of the coil electrode layer disclosed in an embodiment of this application;

[0025] Figure 2 is a schematic diagram of the structure of the coil electrode layer disclosed in an embodiment of this application;

[0026] Figure 3 is an exploded view of the multilayer inductor element disclosed in the embodiments of this application;

[0027] Figure 4 is a schematic diagram of the coil electrode layer when the distance W1 between the first electrical connection terminal and the second electrical connection terminal in the first direction is less than WC+2W0.

[0028] Explanation of reference numerals in the attached drawings: 100, insulating substrate; 200, inner ring electrode; 201, first inner contour line; 202, second inner contour line; 203, first outer contour line; 204, second outer contour line; 210, first electrical connection terminal; 220, clearance portion; 300, outer ring electrode; 301, third outer contour line; 302, fourth outer contour line; 310, first side; 320, second electrical connection terminal; 330, second side; 410, setting area; 500, first lead-out layer; 600, second lead-out layer; 700, inner electrode assembly; 710, inner electrode layer. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] In this invention, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "vertical," "horizontal," "lateral," and "longitudinal" 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 the invention 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.

[0031] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in certain situations to indicate a dependency or connection. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0032] 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 invention based on the specific circumstances.

[0033] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, elements, or components (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, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0034] In related technologies, multilayer inductors are mainly composed of three parts: an insulating frame, internal electrodes that provide inductance, and terminals for external connection. The terminals of the product need to provide physical connection to the outside and form a circuit for conduction.

[0035] The internal electrode includes an internal electrode assembly and a lead-out layer connected to a terminal block. The internal electrode assembly includes multiple internal electrode layers stacked sequentially from top to bottom. Each internal electrode layer includes an insulating substrate and a coil electrode. The coil electrodes are stacked on the surface of the insulating substrate, and adjacent coil electrodes are connected through vias. The lead-out layer also includes an insulating substrate and coil electrodes stacked on the insulating substrate. The coil electrodes of the lead-out layer are also connected to the coil electrodes of the internal electrode layer through vias.

[0036] The inventors discovered that the coil electrodes of the current inner electrode layer and lead-out layer both have two electrical connection terminals (the first electrical connection terminal 210 and the second electrical connection terminal 320 as shown in Figure 4). When using a single-layer multi-turn design, the distance W1 between the first electrical connection terminal 210 and the second electrical connection terminal 320 in the direction indicated by the x-arrow line in Figure 4 is small, which makes the straight-line distance between the two electrical connection terminals also small. Since the upper and lower coil electrodes need to be connected through vias, it is necessary to open through holes in the insulating substrate between the two coil electrodes and make the through holes correspond to one of the electrical connection terminals (e.g., the first electrical connection terminal 210) of the coil electrode located above the insulating substrate.

[0037] When through-holes are made in the insulating substrate, the insulating substrate will generate large stress, which will cause cracks to form on the insulating substrate. After the multilayer inductor has been running for a long time, the cracks will gradually expand. When the cracks expand to the position corresponding to the other electrical connection terminal (e.g., the second electrical connection terminal 320) of the two coil electrodes on the insulating substrate, it may cause the other electrical connection terminal to short-circuit with the lower coil electrode, resulting in a short circuit in the product.

[0038] This application solves the problem of product short circuit by increasing the distance between the two electrical connection terminals of the coil electrode. The coil electrode layer and the stacked inductor element provided in this application will be described in detail below with reference to the accompanying drawings and through specific embodiments and application scenarios.

[0039] As shown in Figures 1 and 2, this application discloses a coil electrode layer applied to a multilayer inductor element, comprising:

[0040] An insulating substrate 100 has a first surface, which may be one of the surfaces of the insulating substrate 100 along its thickness direction. For example, the insulating substrate 100 may be made of materials such as polyimide and polytetrafluoroethylene.

[0041] The inner electrode 200 is disposed on the first surface and coiled along a rectangle. For example, the inner electrode 200 can be coiled around a square or around a rectangle.

[0042] For example, the number of turns of the inner electrode 200 can be greater than one turn or less than one turn. When the number of turns of the inner electrode 200 is greater than one turn, the coil electrode layer can generate a larger inductance value, thereby optimizing the performance of the coil electrode layer; when the number of turns of the inner electrode 200 is less than one turn, the outer size of the inner electrode 200 is smaller, thereby allowing the outer size of the outer electrode 300 to be correspondingly smaller, and thus reducing the outer size of the coil electrode layer, which is beneficial for the miniaturization of the multilayer inductor.

[0043] The outer electrode 300 is disposed on the first surface and coiled along a rectangle. For example, the outer electrode 300 can be coiled around a square or a rectangle. One end of the outer electrode 300 is connected to one end of the inner electrode 200 and is disposed around the inner electrode 200. Along the first direction (the direction shown by the x-arrow line in Figure 1), there is a distance W0 between the outer electrode 300 and the inner electrode 200. The first direction is parallel to the first side 310 of the outer electrode 300.

[0044] For example, both the inner electrode 200 and the outer electrode 300 can be formed directly by printing conductive paste, or they can be formed by coating conductive paste according to a preset electrode pattern and then exposing and developing it. Optionally, the conductive metal in the conductive paste can be made of at least one material or a mixture of at least two materials selected from silver (Ag), palladium (Pd), aluminum (Al), nickel (Ni), titanium (Ti), gold (Au), copper (Cu), and platinum (Pt). For example, the conductive paste can be conductive silver paste, which is a viscous paste composed of high-purity metallic silver particles, binders, solvents, and additives in a mechanical mixture.

[0045] The inner electrode 200 has a first electrical connection terminal 210 located away from the outer electrode 300, and the outer electrode 300 has a second electrical connection terminal 320 located away from the inner electrode 200. Specifically, the first electrical connection terminal 210 can be connected to a coil electrode layer located above or below itself, where the coil electrode layer can be an inner electrode layer 710 or a lead-out layer for connection to a terminal block; the second electrical connection terminal 320 can be connected to a coil electrode layer located above or below itself, where the coil electrode layer can be an inner electrode layer 710 or a lead-out layer for connection to a terminal block.

[0046] The width of both the inner electrode 200 and the outer electrode 300 is W. C The distance between the first electrical connection terminal 210 and the second electrical connection terminal 320 in the first direction is W1, where W1 ≥ WC + 2W0.

[0047] The coil electrode layer of this application includes an inner coil electrode 200 and an outer coil electrode 300. That is, the number of turns of the coil electrode layer is greater than one, so that the number of coil turns of the coil electrode layer can be increased with the same number of electrode layers, thereby increasing the inductance of the inductor using the coil electrode layer of this application.

[0048] Furthermore, the distance between the first electrical connection terminal 210 of the inner ring electrode 200 and the second electrical connection terminal 320 of the outer ring electrode 300 in the first direction is W1, and the width of the coil electrode layer is W. C The distance between the inner electrode 200 and the outer electrode 300 is W0, and W1 ≥ W C+2W0, which allows the first electrical connection terminal 210 and the second electrical connection terminal 320 to be separated by a large distance in the first direction, thereby making the straight-line distance between the first electrical connection terminal 210 and the second electrical connection terminal 320 larger. Thus, even if cracks occur when through holes are opened on the insulating substrate 100 to which the coil electrode layer is attached, corresponding to the positions of the first electrical connection terminal 210 or the second electrical connection terminal 320, the risk of cracks extending to the positions on the insulating substrate 100 corresponding to the second electrical connection terminal 320 or the first electrical connection terminal 210 can be reduced. This prevents the second electrical connection terminal 320 or the first electrical connection terminal 210 from directly contacting the coil electrode layer located below the coil electrode layer, thereby reducing the risk of load short circuit.

[0049] It should be noted that the outermost electrode 300 in this application refers to the portion located on the outermost loop of the coil electrode, while the portion located inside the outermost loop is the inner electrode 200. For example, when the number of coil turns of the coil electrode is between two and three, the outermost portion of the coil electrode is the outer electrode 300, and the portion located inside the outermost loop belongs to the inner electrode 200. In this case, the number of turns of the inner electrode 200 is greater than one. Taking the number of coil turns of the coil electrode as an example, please refer to Figure 1. The dotted line in the upper left corner of Figure 1 is the dividing line between the inner electrode 200 and the outer electrode 300. In this case, the number of turns of the inner electrode 200 is less than one. For example, the number of turns of the inner electrode 200 can be three-quarters of a turn, two-thirds of a turn, etc.

[0050] Since W1 determines the distance along the first direction between the first electrical connection terminal 210 and the second electrical connection terminal 320, as shown in Figure 1, if the first electrical connection terminal 210 is relatively fixed, an excessively large distance will increase the spacing between the inner electrode 200 and the outer electrode 300, thereby increasing the overall size of the multilayer inductor and hindering its miniaturization. If the second electrical connection terminal 320 is relatively fixed, an excessively large distance will cause the first electrical connection terminal 210 to be further away from the second electrical connection terminal 320 (as shown in Figure 1, the first electrical connection terminal 210 is too far to the right), thereby reducing the winding length of the inner electrode 200 and thus reducing the inductance of the multilayer inductor, weakening its performance.

[0051] In one alternative embodiment, W1 ≥ 2W C +2W0, which can further increase the straight-line distance between the first electrical connection terminal and the second electrical connection terminal, thereby further reducing the risk of load short circuit.

[0052] Therefore, in one optional embodiment, the inner contour of the inner ring electrode 200 includes a first inner contour line 201 and a second inner contour line 202. The first inner contour line 201 and the second inner contour line 202 are parallel and spaced apart along a first direction. That is, the first inner contour line 201 and the second inner contour line 202 are both perpendicular to the first direction, and there is a distance W2 between the first inner contour line 201 and the second inner contour line 202, where W1≤W2.

[0053] Taking the first inner contour line 201 located between the first electrical connection terminal 210 and the second electrical connection terminal 320 as an example, i.e., taking the perspective shown in Figure 1 as an example, the first inner contour line 201 is located to the left of the second inner contour line 202. This application makes W1≤W2 so that the first electrical connection terminal 210 is far away from the second inner contour line 202 by a preset distance, so that W1 is within a suitable range, so that the distance between the inner ring electrode 200 and the outer ring electrode 300 is within a suitable range, and the inner ring electrode 200 has a relatively large winding length, thereby increasing the inductance value of the multilayer inductor element.

[0054] In one alternative embodiment, W1 ≤ W2 - W C -W0, thereby giving the inner electrode 200 a larger winding length, further increasing the inductance value of the multilayer inductor.

[0055] In an optional embodiment, referring to Figure 1, there is a spacing W3 between the first electrical connection terminal and the first inner contour line, where W3 ≥ 0.25W2; and a spacing W4 between the first electrical connection terminal and the second inner contour line, where W4 ≥ 0.25W2. This allows the first electrical connection terminal 210 to be located in the middle region of the rectangle containing the inner electrode 200, resulting in better symmetry of the coil electrode layer and a more uniform magnetic field distribution. This reduces inductance deviation caused by winding asymmetry, improves the consistency and stability of the inductance, and ensures the stability of the inductance value under different operating conditions.

[0056] In a further embodiment, please refer to FIG2, the first electrical connection terminal 210 is located on the perpendicular bisector of the first side 310, which is indicated by the n-dot dashed line in FIG2.

[0057] In this embodiment, the first electrical connection terminal 210 being located on the perpendicular bisector of the first side 310 improves the symmetry of the coil electrode layer, resulting in a more uniform magnetic field distribution. This reduces inductance deviation caused by winding asymmetry, improves inductance consistency and stability, and ensures stable inductance values ​​under different operating conditions. Furthermore, a uniform magnetic field distribution stabilizes the mutual inductance between the coil electrode layer and surrounding conductors or other components, reducing electric field distortion caused by uneven magnetic field and thus lowering the generation of parasitic mutual inductance capacitance. Of course, the first electrical connection terminal 210 can also be located on one side of the perpendicular bisector of the first side 310. Taking the perspective shown in Figure 2 as an example, the first electrical connection terminal 210 can also be located on the left or right side of the perpendicular bisector of the first side 310; this application does not impose any limitations on this.

[0058] In one optional embodiment, W0 is 0.02–0.04 mm, W C The value is 0.02–0.04 mm. For example, W0 can be 0.02 mm, 0.025 mm, 0.03 mm, 0.038 mm, 0.04 mm, etc., and this application does not limit the specific value of W0; C The thickness can be 0.02mm, 0.024mm, 0.029mm, 0.036mm, 0.04mm, etc. This application does not cover W. C The specific value is limited. With W0 equal to 0.03 mm, W... C Taking 0.024mm as an example, W1 is greater than or equal to 0.084mm.

[0059] In this embodiment, W0 is set to 0.02~0.04mm, W C Setting it to 0.02–0.04 mm allows W1 to be greater than a preset value, thereby preventing the second electrical connection terminal 320 or the first electrical connection terminal 210 from directly contacting the coil electrode layer located below the coil electrode layer, thus reducing the risk of short circuit in the inductor. Of course, W0 and W... C The value of W0 needs to be flexibly selected based on the specific product. That is to say, in some products, W0 can be less than 0.02mm or greater than 0.04mm, and this application does not impose any restrictions on this. C Similarly, it can be less than 0.02mm or greater than 0.04mm.

[0060] In one alternative embodiment, the outer electrode 300 is coiled along a rectangle, with the first side 310 being the longer side of the outer electrode 300. This embodiment allows the outer electrode 300 to be coiled along a rectangle, which, compared to coiling along a square, allows the first side 310 to have a greater length, thereby increasing the number of turns in the coil electrode layer and thus increasing the inductance of the multilayer inductor. Alternatively, the inner electrode 200 can also be coiled along a rectangle, which also increases the number of turns in the coil electrode layer and increases the inductance of the multilayer inductor. Of course, in other embodiments, the outer electrode 300 is coiled along a rectangle, but the first side 310 is the shorter side of the outer electrode 300.

[0061] In an alternative embodiment, the outer ring electrode 300 further has a second side 330, which is the short side of the outer ring electrode 300. The first electrical connection terminal 210 and the second electrical connection terminal 320 are located on the same side of the perpendicular bisector of the second side 330, which is shown by the dotted line in FIG2.

[0062] Taking the perspective shown in Figure 2 as an example, assuming the position of the first electrical connection terminal 210 remains unchanged, if the first electrical connection terminal 210 and the second electrical connection terminal 320 are located on both sides of the vertical line of the second side 330, the second electrical connection terminal 320 needs to extend downwards. This will shorten the length of the part connecting the outer electrode 300 and the second electrical connection terminal 320, thereby reducing the number of coil turns of the outer electrode 300 and reducing the inductance of the multilayer inductor. If the position of the second electrical connection terminal 320 remains unchanged, and the first electrical connection terminal 210 and the second electrical connection terminal 320 are located on both sides of the vertical line of the second side 330, the first electrical connection terminal 210 cannot extend above the vertical line of the second side 330. This will shorten the length of the inner electrode 200, thereby reducing the number of coil turns of the inner electrode 200 and reducing the inductance of the multilayer inductor.

[0063] In an optional embodiment, referring to FIG2, the inner ring electrode 200 includes a first outer contour line 203 and a second outer contour line 204. The first outer contour line 203 extends along a first direction and is connected to the first electrical connection terminal 210. The second outer contour line 204 is perpendicular to the first outer contour line 203 and is located between the first electrical connection terminal 210 and the second electrical connection terminal 320.

[0064] The outer electrode 300 includes a third outer contour line 301 and a fourth outer contour line 302. The third outer contour line 301 extends in a direction perpendicular to the first direction and is connected to the second electrical connection terminal 320. The fourth outer contour line 302 extends in the first direction, and the fourth outer contour line 302 and the second electrical connection terminal 320 are located on the same side of the perpendicular bisector of the second side 330.

[0065] The straight line containing the first outer contour line 203, the straight line containing the second outer contour line 204, the straight line containing the third outer contour line 301, and the straight line containing the fourth outer contour line 302 together enclose the setting area 410, and at least a portion of the second electrical connection terminal 320 is located within the setting area 410.

[0066] In this embodiment, the straight lines containing the first outer contour line 203, the second outer contour line 204, the third outer contour line 301, and the fourth outer contour line 302 together enclose the setting area 410, which is located at the corner of the rectangle containing the outer electrode 300. This allows at least a portion of the second electrical connection terminal 320 to extend into the setting area 410, enabling the outer electrode 300 to coil around the rectangular contour completely, thereby increasing the number of coil turns of the outer electrode 300 and increasing the inductance of the multilayer inductor. Of course, the second electrical connection terminal 320 may not be located within the setting area 410, and this application does not impose any restrictions on this.

[0067] In one optional embodiment, the second electrical connection terminal 320 is located at the corner of the rectangle containing the outer ring electrode 300. The outer ring electrode 300 has a second side 330 connected to the second electrical connection terminal 320, and the second side 330 is perpendicular to the first side 310. The diameter of the second electrical connection terminal 320 is greater than the width of the second side 330, that is, the cross-section of the second electrical connection terminal 320 is circular. Of course, the cross-section of the second electrical connection terminal 320 can also be polygonal, elliptical, or other shapes, and this application is not limited to this.

[0068] The diameter of the second electrical connection terminal 320 is larger than the width of the second side 330, which allows the second electrical connection terminal 320 to protrude radially out of the second side 330. When the upper and lower coil electrode layers are stacked, even if the upper and lower coil electrode layers are misaligned, the larger diameter of the second electrical connection terminal 320 ensures that the electrical connection terminals of the upper and lower coil electrode layers correspond, so that the upper and lower coil electrode layers can be smoothly connected through the via.

[0069] The second electrical connection terminal 320 is biased relative to the second side 330 towards the inner electrode 200.

[0070] The coil electrodes, manufactured through printing, exposure, and development, are stacked on an insulating substrate. The insulating substrate has several inner ring electrodes 200 and several outer ring electrodes 300 arranged on it. Therefore, the insulating substrate needs to be cut into multiple insulating bases 100, each with one inner ring electrode 200 and one outer ring electrode 300. If the second electrical connection terminal 320 is offset away from the inner ring electrode 200 relative to the second side 330, the margin between the second electrical connection terminal 320 and the edge of the insulating base 100 is small. If the cutting is skewed during the cutting of the insulating substrate, it will result in cutting the second electrical connection terminal 320, that is, cutting the outer dimensions of the insulating base 100 too small. Obviously, this will cause the second electrical connection terminal 320 to extend radially beyond the insulating base 100, leading to a short circuit between the coil electrode and external components. Furthermore, cutting the second electrical connection terminal 320 may also damage it. Therefore, in this embodiment, the second electrical connection terminal 320 is offset relative to the second side 330 towards the inner circle electrode 200, thereby increasing the margin distance between the second electrical connection terminal 320 and the edge of the insulating substrate 100. In this way, even if the cutting is skewed when cutting the insulating substrate, the risk of cutting the second electrical connection terminal 320 can be reduced, thereby reducing the risk that the second electrical connection terminal 320 will be exposed to the outside of the insulating substrate 100 or even be cut off during cutting.

[0071] After the second electrical connection terminal 320 is biased towards the inner ring electrode 200, the distance between the second electrical connection terminal 320 and the inner ring electrode 200 is reduced. This reduced distance strengthens the electric field coupling between the inner ring electrode 200 and the outer ring electrode 300, leading to increased parasitic capacitance and reduced filtering effect of the multilayer inductor on high-frequency signals. In an optional embodiment, the inner ring electrode 200 includes a clearance portion 220, which is disposed opposite to the second electrical connection terminal 320 in a first direction and is inclined away from the second electrical connection terminal 320. For example, the clearance portion 220 may be flat.

[0072] In this embodiment, the inner electrode 200 includes a clearance portion 220 opposite to the second electrical connection end 320 in a first direction. The clearance portion 220 is inclined away from the second electrical connection end 320, which increases the distance between the second electrical connection end 320 and the inner electrode 200, thereby reducing the electric field coupling between the inner electrode 200 and the outer electrode 300 and reducing parasitic capacitance. Furthermore, since the second electrical connection end 320 in this embodiment is located at the corner of the rectangle containing the outer electrode 300, the clearance portion 220 is also located at the corner of the inner electrode 200. Compared to placing the clearance portion 220 in the middle of the rectangular side of the inner electrode 200, it is easier to place the clearance portion 220 at the corner, thereby simplifying the winding difficulty of the inner electrode 200.

[0073] Furthermore, placing the clearance portion 220 at the corner will not significantly alter the shape of the inner electrode 200, and will allow the inner electrode 200 to have a more regular shape, resulting in a more uniform distribution of the magnetic field generated by the inner electrode 200, improving the consistency and stability of the inductance, and ensuring the stability of the inductance value under different operating conditions.

[0074] In one alternative embodiment, the inner electrode 200 has a third side that extends along a first direction and is connected to a first electrical connection terminal 210. The diameter of the first electrical connection terminal 210 is greater than the width of the third side, and the first electrical connection terminal 210 is biased relative to the third side in a direction away from the outer electrode 300.

[0075] In this embodiment, the first electrical connection terminal 210 is biased away from the outer ring electrode 300 relative to the third side. This allows for a larger gap between the inner ring electrode 200 and the outer ring electrode 300, thereby reducing the electric field coupling between the inner ring electrode 200 and the outer ring electrode 300 and reducing parasitic capacitance.

[0076] As shown in Figure 3, this application embodiment also discloses a multilayer inductor element, including:

[0077] A first lead-out layer 500 is used to connect to a first terminal block; a second lead-out layer 600 is used to connect to a second terminal block; and an inner electrode assembly 700 is disposed between the first lead-out layer 500 and the second lead-out layer 600. The inner electrode assembly 700 includes a plurality of inner electrode layers 710 that are stacked and connected sequentially along their own thickness direction.

[0078] At least one of the multiple inner electrode layers 710 is a coil electrode layer as described in any of the above embodiments, and / or at least one of the first lead layer 500 and the second lead layer 600 is a coil electrode layer as described in any of the above embodiments. This enables the stacked inductor to have the beneficial effects of the coil electrode layer described above, which will not be elaborated here.

[0079] The foregoing embodiments of this application focus on describing the differences between various embodiments. As long as the different optimization features between embodiments are not contradictory, they can be combined to form better embodiments. For the sake of brevity, these differences will not be elaborated upon here. The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art, under the guidance of this application, can make many modifications without departing from the spirit and scope of the claims, all of which fall within the protection scope of this application.

Claims

1. A coil electrode layer, applied to a multilayer inductor, characterized in that, include: An insulating substrate (100) having a first surface; Inner ring electrode (200), the inner ring electrode (200) is disposed on the first surface and coiled along a rectangle; An outer ring electrode (300) is disposed on the first surface and coiled along a rectangle. One end of the outer ring electrode (300) is connected to one end of the inner ring electrode (200) and is disposed around the inner ring electrode (200). Along a first direction, there is a distance W0 between the outer ring electrode (300) and the inner ring electrode (200). The first direction is parallel to the first side (310) of the outer ring electrode (300). The inner electrode (200) has a first electrical connection terminal (210) disposed away from the outer electrode (300), and the outer electrode (300) has a second electrical connection terminal (320) disposed away from the inner electrode (200); The width of both the inner electrode (200) and the outer electrode (300) is W. C The distance between the first electrical connection terminal (210) and the second electrical connection terminal (320) in the first direction is W1, where W1 ≥ W C +2W0.

2. The coil electrode layer according to claim 1, characterized in that, W1≥2W C +2W0.

3. The coil electrode layer according to claim 1, characterized in that, The inner contour of the inner electrode (200) includes a first inner contour line (201) and a second inner contour line (202). The first inner contour line (201) and the second inner contour line (202) are parallel and spaced apart along the first direction. There is a distance W2 between the first inner contour line (201) and the second inner contour line (202), where W1≤W2.

4. The coil electrode layer according to claim 3, characterized in that, W1≤W2-W C -W0。 5. The coil electrode layer according to claim 3, characterized in that, The first electrical connection terminal (210) and the first inner contour line (201) have a distance W3, where W3 ≥ 0.25W2; There is a gap W4 between the first electrical connection terminal (210) and the second inner contour line (202), where W4 ≥ 0.25W2.

6. The coil electrode layer according to claim 1, characterized in that, W0 is 0.02~0.04mm, W C It is 0.02 to 0.04 mm.

7. The coil electrode layer according to claim 1, characterized in that, The outer electrode (300) is coiled along a rectangle, and the first side (310) is the long side of the outer electrode (300).

8. The coil electrode layer according to claim 7, characterized in that, The outer electrode (300) also has a second side (330), which is the short side of the outer electrode (300), and the first electrical connection end (210) and the second electrical connection end (320) are located on the same side of the perpendicular bisector of the second side (330).

9. The coil electrode layer according to claim 8, characterized in that, The inner electrode (200) includes a first outer contour line (203) and a second outer contour line (204). The first outer contour line (203) extends along the first direction and connects to the first electrical connection end (210). The second outer contour line (204) is perpendicular to the first outer contour line (203) and is located between the first electrical connection end (210) and the second electrical connection end (320). The outer electrode (300) includes a third outer contour line (301) and a fourth outer contour line (302). The third outer contour line (301) extends in a direction perpendicular to the first direction and is connected to the second electrical connection end (320). The fourth outer contour line (302) extends in the first direction, and the fourth outer contour line (302) and the second electrical connection end (320) are located on the same side of the perpendicular bisector of the second side (330). The straight line containing the first outer contour line (203), the straight line containing the second outer contour line (204), the straight line containing the third outer contour line (301), and the straight line containing the fourth outer contour line (302) together enclose a setting area (410), and at least a portion of the second electrical connection terminal (320) is located within the setting area (410).

10. The coil electrode layer according to claim 1, characterized in that, The second electrical connection terminal (320) is located at the corner of the rectangle containing the outer ring electrode (300). The outer ring electrode (300) has a second side (330) that is connected to the second electrical connection terminal (320). The second side (330) is perpendicular to the first side (310). The diameter of the second electrical connection terminal (320) is greater than the width of the second side (330). The second electrical connection terminal (320) is offset relative to the second side (330) towards the inner ring electrode (200).

11. The coil electrode layer according to claim 10, characterized in that, The inner electrode (200) includes a clearance portion (220), which is disposed opposite to the second electrical connection end (320) in the first direction, and the clearance portion (220) is inclined in a direction away from the second electrical connection end (320).

12. The coil electrode layer according to claim 1, characterized in that, The inner electrode (200) has less than one winding.

13. A multilayer inductor element, characterized in that, include: A first lead-out layer (500) is used to connect to a first terminal block; The second lead-out layer (600) is used to connect to the second terminal block; An internal electrode assembly (700) is disposed between the first lead-out layer (500) and the second lead-out layer (600); The internal electrode assembly (700) includes a plurality of internal electrode layers (710) that are stacked and connected sequentially along its own thickness direction; At least one of the plurality of inner electrode layers (710) is a coil electrode layer as claimed in any one of claims 1 to 12, and / or at least one of the first lead-out layer (500) and the second lead-out layer (600) is a coil electrode layer as claimed in any one of claims 1 to 12.

Images