Coil electrode layer and laminated inductor element

Abstract

The invention relates to the technical field of inductance components, in particular to a coil electrode layer and a laminated inductance component. The coil electrode layer includes an insulating substrate having a first surface; the inner ring electrode is arranged on the first surface and is coiled along the rectangle; the outer-ring electrode is arranged on the first surface and is coiled along the rectangle, one end of the outer-ring electrode is connected with one end of the inner-ring electrode and is arranged around the inner-ring electrode, a distance W0 is formed between the outer-ring electrode and the inner-ring electrode in the first direction, and the first direction is parallel to the first edge of the outer-ring electrode; the inner ring electrode is provided with a first electric connection end far away from the outer ring electrode, and the outer ring electrode is provided with a second electric connection end far away from the inner ring electrode; the width of the inner ring electrode and the width of the outer ring electrode are both WC, the distance between the first electric connecting end and the second electric connecting end in the first direction is W1, and W1 is larger than or equal to WC + 2W0. Therefore, the load reliability of the product can be improved, the short circuit phenomenon after the product is loaded is prevented, and the inductance value can be increased.

Description

Technical Field

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

[0002] With the application of 5G and the development of 6G, the communications industry is constantly moving towards higher frequencies, and its application circuits are bound to put forward high-frequency reliability requirements for electronic components. In inductor components, the shape and size of the electrodes in the product have a direct impact on the reliability of the inductor components.

[0003] Generally speaking, the inner electrode single-layer coil of an inductor component is usually less than a full turn, which requires more layers to obtain multiple turns and large inductance values. However, due to product thickness limitations, there are certain requirements for the number of inner electrode layers, so it is necessary to increase the number of turns of the single-layer coil, but the single-layer multi-turn design often has the risk of short circuit.

[0004] Therefore, how to design an inductor component with small size, large inductance and high load reliability is a technical problem that needs to be solved urgently in this field. Summary of the invention

[0005] The embodiments of the present application disclose a coil electrode layer and a laminated inductor element, which can improve the load reliability of the product, prevent the product from short-circuiting after being loaded, and increase the inductance value.

[0006] In order to achieve the above objectives, in a first aspect, an embodiment of the present application discloses a coil electrode layer, which is applied to a laminated inductor component, comprising:

[0007] an insulating substrate having a first surface;

[0008] An inner ring electrode, the inner ring electrode is arranged on the first surface and coiled along a rectangular shape;

[0009] An outer ring electrode, the outer ring electrode is arranged 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 arranged around the inner ring electrode, along a first direction, there is a spacing W0 between the outer ring electrode and the inner ring electrode, and the first direction is parallel to a first side of the outer ring electrode;

[0010] The inner ring electrode has a first electrical connection end disposed away from the outer ring electrode, and the outer ring electrode has a second electrical connection end disposed away from the inner ring electrode;

[0011] The width of the inner electrode and the outer electrode is W C , the distance between the first electrical connection end and the second electrical connection end in the first direction is W1, W1≥W C +2W0.

[0012] In an optional embodiment, W1≥2W C +2W0.

[0013] In an optional embodiment, the inner contour of the inner ring electrode includes a first inner contour line and a second inner contour line, the first inner contour line and the second inner contour line are parallel and spaced apart along the first direction, and there is a spacing W2 between the first inner contour line and the second inner contour line, W1≤W2.

[0014] In an optional embodiment, W1≤W2-W C -W0.

[0015] In an optional embodiment, there is a distance W3 between the first electrical connection end and the first inner contour line, W3 ≥ 0.25W2;

[0016] There is a distance W4 between the first electrical connection end and the second inner contour line, where W4≥0.25W2.

[0017] In an optional embodiment, W0 is 0.02-0.04 mm, W C It is 0.02~0.04mm.

[0018] In an optional embodiment, the outer ring electrode is coiled along a rectangle, and the first side is the long side of the outer ring electrode.

[0019] In an optional embodiment, the first electrical connection end is located on the perpendicular midline of the first side.

[0020] In an optional embodiment, the outer ring electrode further has a second side, the second side is a short side of the outer ring electrode, and the first electrical connection end and the second electrical connection end are located on the same side of a perpendicular midline of the second side.

[0021] In an optional embodiment, the inner ring electrode includes a first outer contour line and a second outer contour line, the first outer contour line extends along the first direction and is connected to the first electrical connection end, and the second outer contour line is perpendicular to the first outer contour line and is located between the first electrical connection end and the second electrical connection end;

[0022] The outer ring electrode comprises a third outer contour line and a fourth outer contour line, the third outer contour line extends in a direction perpendicular to the first direction and is connected to the second electrical connection end, the fourth outer contour line extends in the first direction, and the fourth outer contour line and the second electrical connection end are located on the same side of the perpendicular midline of the second side;

[0023] The straight line where the first outer contour line is located, the straight line where the second outer contour line is located, the straight line where the third outer contour line is located, and the straight line where the fourth outer contour line is located together enclose a setting area, and at least a part of the second electrical connection end is located in the setting area.

[0024] In an optional embodiment, the second electrical connection end is located at the corner of the rectangle where the outer ring electrode is located, the outer ring electrode has a second side connected to the second electrical connection end, the second side is perpendicular to the first side, the diameter of the second electrical connection end is greater than the width of the second side, and the second electrical connection end is biased relative to the second side in a direction close to the inner ring electrode.

[0025] In an optional embodiment, the inner ring electrode includes a avoidance portion, the avoidance portion is arranged opposite to the second electrical connection end in the first direction, and the avoidance portion is inclined in a direction away from the second electrical connection end.

[0026] In an optional embodiment, the number of turns of the inner ring electrode is less than one turn.

[0027] In a second aspect, the present application provides a stacked inductor component, comprising:

[0028] A first lead-out layer, wherein the first lead-out layer is used to connect to a first wiring terminal;

[0029] A second lead-out layer, wherein the second lead-out layer is used to connect to a second wiring terminal;

[0030] an inner electrode assembly, the inner electrode assembly being disposed between the first lead-out layer and the second lead-out layer;

[0031] The internal electrode assembly comprises a plurality of internal electrode layers sequentially stacked and connected along the thickness direction of the internal electrode assembly;

[0032] At least one of the plurality of internal electrode layers is the coil electrode layer described in any one of the above embodiments, and / or at least one of the first lead-out layer and the second lead-out layer is the coil electrode layer described in any one of the above embodiments.

[0033] Compared with the related art, the beneficial effects of this application are:

[0034] The coil electrode layer of the present application includes an inner circle electrode and an outer circle electrode, that is, the number of winding turns of the single-layer electrode layer of the coil is greater than one circle, so that the number of electrode turns of the coil electrode layer can be increased under the same number of electrode layers, thereby increasing the inductance value of the inductor element using the coil electrode layer of the present application.

[0035] In the present invention, the distance between the first electrical connection end of the inner ring electrode and the second electrical connection end 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, W1≥W C +2W0, in this way, the first electrical connection end and the second electrical connection end can be separated by a larger distance in the first direction, so that the straight-line distance between the first electrical connection end and the second electrical connection end is larger. In this way, even if cracks are generated when a through hole is opened at a position corresponding to the first electrical connection end or the second electrical connection end on the insulating substrate to which the coil electrode layer is attached, the risk of the cracks extending to the position corresponding to the second electrical connection end or the first electrical connection end on the insulating substrate can be reduced, thereby preventing the second electrical connection end or the first electrical connection end from directly contacting the coil electrode layer located below the coil electrode layer, thereby reducing the risk of load short circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0037] Figure 1 The structure of the coil electrode layer disclosed in the embodiment of the present application is schematically shown in FIG. Figure 1 ;

[0038] Figure 2 The structure of the coil electrode layer disclosed in the embodiment of the present application is schematically shown in FIG. Figure 2 ;

[0039] Figure 3 An exploded schematic diagram of a stacked inductor element disclosed in an embodiment of the present application;

[0040] Figure 4 When the distance W1 between the first electrical connection terminal and the second electrical connection terminal in the first direction is less than W C Schematic diagram of the structure of the coil electrode layer at +2W0.

[0041] Description of reference numerals:

[0042] 100, insulating substrate; 200, inner circle 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, avoidance portion; 300, outer circle 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 layer; 600, second lead layer; 700, inner electrode assembly; 710, inner electrode layer. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] In the present invention, the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal" and the like are based on the directions or positional relationships shown in the drawings. These terms are mainly used to better describe the present invention and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific direction, or to be constructed and operated in a specific direction.

[0045] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those skilled in the art, the specific meanings of these terms in the present invention can be understood according to specific circumstances.

[0046] In addition, the terms "installed", "set", "provided with", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0048] In the related art, the composition of the multilayer inductor element is mainly divided into three parts: the frame body that acts as an insulator, the internal electrodes that act as an inductor, and the wiring terminals connected to the outside. The wiring terminals of the product need to be physically connected to the outside and form a loop conduction with the circuit.

[0049] The internal electrode includes an internal electrode assembly and a lead-out layer connected to the wiring terminal. The internal electrode assembly includes a plurality of internal electrode layers stacked in sequence from top to bottom. Each internal electrode layer includes an insulating substrate and a coil electrode. The coil electrode is stacked on the surface of the insulating substrate, and two adjacent coil electrodes are connected through vias. The lead-out layer also includes an insulating substrate and a coil electrode stacked on the insulating substrate. The coil electrode of the lead-out layer is also connected to the coil electrode of the internal electrode layer through vias.

[0050] The inventors have found that the current coil electrodes of the inner electrode layer and the lead-out layer both have two electrical connection terminals (such as Figure 4 The first electrical connection end 210 and the second electrical connection end 320 shown in the figure are connected to each other at the same time. Figure 4 The spacing W1 in the direction indicated by the x-arrow line is small, so that the straight-line distance between the two electrical connection ends is also small. Since the coil electrodes of the upper and lower layers are to be connected through vias, it is necessary to open a through hole on the insulating substrate between the two coil electrodes, and make the through hole correspond to one of the electrical connection ends (for example, the first electrical connection end 210) of the coil electrode located above the insulating substrate.

[0051] When a through hole is opened in the insulating substrate, the insulating substrate will generate greater stress, which will cause cracks on the insulating substrate. After the laminated inductor element has been running for a long time, the cracks will gradually expand. When the cracks expand to the position corresponding to the insulating substrate and the other electrical connection end of the two coil electrodes (for example, the second electrical connection end 320), it may cause the other electrical connection end to be short-circuited with the coil electrode of the lower layer, thereby causing a short circuit in the product.

[0052] The present application solves the problem of product short circuit by increasing the distance between the two electrical connection ends of the coil electrode. The coil electrode layer and the laminated inductor element provided in the embodiment of the present application are described in detail below through specific embodiments and their application scenarios in conjunction with the accompanying drawings.

[0053] like Figure 1 to Figure 2As shown, the embodiment of the present application discloses a coil electrode layer, which is applied to a laminated inductor component, including:

[0054] The insulating substrate 100 has a first surface, where the first surface 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 polyimide, polytetrafluoroethylene, and the like.

[0055] The inner ring electrode 200 is disposed on the first surface and coiled along a rectangle. For example, the inner ring electrode 200 can be coiled around a square or a rectangle.

[0056] Exemplarily, the number of windings of the inner circle electrode 200 can be greater than one circle or less than one circle. When the number of windings of the inner circle electrode 200 is greater than one circle, the coil electrode layer can generate a greater inductance value to optimize the performance of the coil electrode layer; when the number of windings of the inner circle electrode 200 is less than one circle, the outer dimensions of the inner circle electrode 200 are smaller, so that the outer dimensions of the outer circle electrode 300 can be correspondingly reduced, thereby reducing the outer dimensions of the coil electrode layer, which is conducive to the miniaturization of the laminated inductor component.

[0057] The outer ring electrode 300 is disposed on the first surface and is wound along a rectangle. For example, the outer ring electrode 300 can be wound around a square or 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. Figure 1 There is a spacing W0 between the outer ring electrode 300 and the inner ring electrode 200, and the first direction is parallel to the first side 310 of the outer ring electrode 300.

[0058] Exemplarily, the inner ring electrode 200 and the outer ring electrode 300 can be formed directly by printing conductive paste, or can be formed by coating conductive paste according to a preset electrode pattern and exposing and developing. Optionally, the conductive metal in the conductive paste can be made of at least one material selected from silver (Ag), palladium (Pd), aluminum (Al), nickel (Ni), titanium (Ti), gold (Au), copper (Cu) and platinum (Pt) or a mixture of at least two materials. For example, the conductive paste can be conductive silver paste, that is, a viscous paste of a mechanical mixture composed of high-purity metallic silver particles, adhesives, solvents, and additives.

[0059] The inner ring electrode 200 has a first electrical connection end 210 disposed away from the outer ring electrode 300, and the outer ring electrode 300 has a second electrical connection end 320 disposed away from the inner ring electrode 200. Specifically, the first electrical connection end 210 can be connected to the coil electrode layer located above or below itself, where the coil electrode layer can be the inner electrode layer 710 or the lead-out layer for connecting to the wiring terminal; the second electrical connection end 320 can be connected to the coil electrode layer located above or below itself, where the coil electrode layer can be the inner electrode layer 710 or the lead-out layer for connecting to the wiring terminal.

[0060] The width of 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, W1≥WC+2W0.

[0061] The coil electrode layer of the present application includes an inner ring electrode 200 and an outer ring electrode 300, that is, the number of winding turns of the coil electrode layer is greater than one turn, so that the number of coil turns of the coil electrode layer can be increased under the same number of electrode layers, thereby increasing the inductance of the inductor element using the coil electrode layer of the present application.

[0062] In the present application, the distance between the first electrical connection end 210 of the inner ring electrode 200 and the second electrical connection end 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, W1≥W C +2W0, in this way, the first electrical connection terminal 210 and the second electrical connection terminal 320 can be separated by a larger distance in the first direction, so that the straight-line distance between the first electrical connection terminal 210 and the second electrical connection terminal 320 is larger. In this way, even if cracks are generated when a through hole is opened at a position corresponding to the first electrical connection terminal 210 or the second electrical connection terminal 320 on the insulating substrate 100 to which the coil electrode layer is attached, the risk of the cracks extending to the position corresponding to the second electrical connection terminal 320 or the first electrical connection terminal 210 on the insulating substrate 100 can be reduced, 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, thereby reducing the risk of load short circuit.

[0063] It should be noted that the outer ring electrode 300 of the present application is the part located at the outermost circle of the coil electrode, and the part located inside the outermost circle is the inner ring electrode 200. For example, when the number of turns of the coil electrode is between two and three, the outermost circle of the coil electrode is the outer ring electrode 300, and the part located inside the outermost circle belongs to the inner ring electrode 200. At this time, the number of turns of the inner ring electrode 200 is greater than one. For example, when the number of turns of the coil electrode is between one and two, please refer to Figure 1 ,lie in Figure 1 The dotted line on the upper left is the dividing line between the inner circle electrode 200 and the outer circle electrode 300. At this time, the number of windings of the inner circle electrode 200 is less than one circle. For example, the number of windings of the inner circle electrode 200 can be three quarters of a circle, two thirds of a circle, etc.

[0064] Since W1 determines the distance between the first electrical connection end 210 and the second electrical connection end 320 along the first direction, please refer to Figure 1 , if the first electrical connection end 210 is relatively fixed, for example, if the distance is too large, the distance between the inner electrode 200 and the outer electrode 300 will increase, thereby increasing the size of the multilayer inductor component, which is not conducive to the miniaturization of the multilayer inductor component. If the second electrical connection end 320 is relatively fixed, for example, if the distance is too large, the first electrical connection end 210 will be farther away from the second electrical connection end 320 (such as Figure 1 The first electrical connection end 210 in the circuit is too far to the right), thereby reducing the winding length of the inner electrode 200, thereby reducing the inductance of the stacked inductor element, thereby weakening the performance of the stacked inductor element.

[0065] In an optional embodiment, W1≥2W C +2W0, so that the straight-line distance between the first electrical connection terminal and the second electrical connection terminal can be further increased to further reduce the risk of load short circuit.

[0066] Therefore, in an 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, and the first inner contour line 201 and the second inner contour line 202 are parallel and spaced apart along the 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 spacing W2 between the first inner contour line 201 and the second inner contour line 202, W1≤W2.

[0067] Take the first inner contour line 201 located between the first electrical connection end 210 and the second electrical connection end 320 as an example. Figure 1 Taking the perspective shown as an example, the first inner contour line 201 is located on the left side of the second inner contour line 202. The present application makes W1≤W2 so that the first electrical connection end 210 can be away from the second inner contour line 202 by a preset distance, so that W1 is within a suitable range, so that the spacing 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 improving the inductance value of the laminated inductor element.

[0068] In an optional embodiment, W1≤W2-W C -W0, so that the inner electrode 200 has a larger winding length, further improving the inductance value of the stacked inductor element.

[0069] In an alternative embodiment, see Figure 1 There is a spacing W3 between the first electrical connection end and the first inner contour line, W3≥0.25W2; there is a spacing W4 between the first electrical connection end and the second inner contour line, W4≥0.25W2, so that the first electrical connection end 210 can be located in the middle area of ​​the rectangle where the inner ring electrode 200 is located, so that the symmetry of the coil electrode layer is better, so that the magnetic field is distributed more evenly, so as to reduce the inductance deviation caused by winding asymmetry, improve the consistency and stability of the inductance, and ensure the stability of the inductance value under different working conditions.

[0070] For further examples, see Figure 2 The first electrical connection end 210 is located on the perpendicular midline of the first side 310. The perpendicular midline of the first side 310 is Figure 2 The n dot-dashed lines are shown in FIG.

[0071] In this embodiment, the first electrical connection end 210 is located on the mid-perpendicular line of the first side 310, which can make the symmetry of the coil electrode layer better, so that the magnetic field distribution is more uniform, so as to reduce the inductance deviation caused by asymmetric winding, improve the consistency and stability of the inductance, and ensure the stability of the inductance value under different working conditions; and the uniform magnetic field distribution can make the mutual inductance between the coil electrode layer and the surrounding conductors or other components more stable, reduce the electric field distortion caused by the uneven magnetic field, and thus reduce the generation of mutual inductance parasitic capacitance. Of course, the first electrical connection end 210 can also be located on one side of the mid-perpendicular line of the first side 310, so as to reduce the inductance deviation caused by the uneven magnetic field. Figure 2 Taking the perspective shown as an example, the first electrical connection end 210 may also be located on the left or right side of the perpendicular midline of the first side 310 , and the present application is not limited to this.

[0072] In an optional embodiment, W0 is 0.02-0.04 mm, W C For example, W0 can be 0.02 mm, 0.025 mm, 0.03 mm, 0.038 mm, 0.04 mm, etc. The present application does not limit the specific value of W0; W C It can be 0.02mm, 0.024mm, 0.029mm, 0.036mm, 0.04mm, etc. This application does not apply to W C The specific value of W0 is limited. C Taking 0.024 mm as an example, W1 is greater than or equal to 0.084 mm.

[0073] In this embodiment, W0 is set to 0.02-0.04 mm, W CBy setting it to 0.02-0.04 mm, W1 can be made larger than the preset value, thereby preventing the second electrical connection end 320 or the first electrical connection end 210 from directly contacting the coil electrode layer located below the coil electrode layer, thereby reducing the risk of short circuit of the inductor element. C The value of needs to be flexibly selected according to the specific product, that is, in some products, W0 can also be less than 0.02mm or greater than 0.04mm, which is not limited in this application; W C Similarly, it can be smaller than 0.02 mm or larger than 0.04 mm.

[0074] In an optional embodiment, the outer ring electrode 300 is coiled along a rectangle, and the first side 310 is the long side of the outer ring electrode 300. In this embodiment, the outer ring electrode 300 is coiled along a rectangle. Compared with coiling along a square, this embodiment can make the first side 310 have a longer length, thereby increasing the number of coil turns of the coil electrode layer to increase the inductance of the laminated inductor element. In addition, the inner ring electrode 200 can also be coiled along a rectangle, which can also increase the number of coil turns of the coil electrode layer and increase the inductance of the laminated inductor element. Of course, in other embodiments, the outer ring electrode 300 is coiled along a rectangle, but the first side 310 is the short side of the outer ring electrode 300.

[0075] In an optional embodiment, the outer ring electrode 300 further has a second side 330, the second side 330 is a short side of the outer ring electrode 300, the first electrical connection end 210 and the second electrical connection end 320 are located on the same side of the perpendicular midline of the second side 330, and the perpendicular midline of the second side 330 is Figure 2 The m is shown by the dot-dash line.

[0076] by Figure 2 Taking the perspective shown as an example, based on the unchanged position of the first electrical connection end 210, if the first electrical connection end 210 and the second electrical connection end 320 are respectively located on both sides of the mid-perpendicular line of the second side 330, the second electrical connection end 320 needs to extend downward, which will shorten the length of the portion where the outer ring electrode 300 is connected to the second electrical connection end 320, thereby reducing the number of coil turns of the outer ring electrode 300 and causing the inductance value of the stacked inductor element to decrease; based on the unchanged position of the second electrical connection end 320, if the first electrical connection end 210 and the second electrical connection end 320 are respectively located on both sides of the mid-perpendicular line of the second side 330, the first electrical connection end 210 cannot extend above the mid-perpendicular line of the second side 330, which will shorten the length of the inner ring electrode 200, thereby reducing the number of coil turns of the inner ring electrode 200 and causing the inductance value of the stacked inductor element to decrease.

[0077] In an alternative embodiment, see Figure 2The inner circle 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 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.

[0078] The outer ring 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.

[0079] The straight line where the first outer contour line 203 , the straight line where the second outer contour line 204 , the straight line where the third outer contour line 301 and the straight line where the fourth outer contour line 302 are located together enclose a setting area 410 , and at least a portion of the second electrical connection terminal 320 is located in the setting area 410 .

[0080] In this embodiment, the straight line where the first outer contour line 203, the straight line where the second outer contour line 204, the straight line where the third outer contour line 301 and the straight line where the fourth outer contour line 302 are located together enclose the setting area 410, which will be located at the corner of the rectangle where the outer ring electrode 300 is located, so that at least part of the second electrical connection end 320 extends to the setting area 410, so that the outer ring electrode 300 can be coiled around the rectangular contour for a full circle, thereby increasing the number of coils of the outer ring electrode 300 to increase the inductance value of the laminated inductor element. Of course, the second electrical connection end 320 may not be located in the setting area 410, and this application does not limit this.

[0081] In an optional embodiment, the second electrical connection end 320 is located at the corner of the rectangle where the outer ring electrode 300 is located, and the outer ring electrode 300 has a second side 330 connected to the second electrical connection end 320, the second side 330 is perpendicular to the first side 310, and the diameter of the second electrical connection end 320 is greater than the width of the second side 330, that is, the cross section of the second electrical connection end 320 is circular. Of course, the cross section of the second electrical connection end 320 can also be a polygon, an ellipse, etc., and this application is not limited to this.

[0082] Here, the diameter of the second electrical connection end 320 is greater than the width of the second side 330, so that the second electrical connection end 320 can protrude radially from 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, due to the larger diameter of the second electrical connection end 320, the electrical connection ends of the upper and lower coil electrode layers can correspond to each other, so that the upper and lower coil electrode layers can be smoothly connected through the vias.

[0083] The second electrical connection end 320 is biased relative to the second side 330 toward the direction close to the inner circle electrode 200 .

[0084] The coil electrodes made by printing, exposure and development are stacked on the insulating substrate, and a plurality of inner circle electrodes 200 and a plurality of outer circle electrodes 300 are arranged on the insulating substrate. Therefore, the insulating substrate needs to be cut into a plurality of insulating substrates 100, and each insulating substrate 100 is provided with an inner circle electrode 200 and an outer circle electrode 300. If the second electrical connection end 320 is offset in a direction away from the inner circle electrode 200 relative to the second edge 330, the margin distance between the second electrical connection end 320 and the edge of the insulating substrate 100 is small. When cutting the insulating substrate, if the cutting is skewed, the second electrical connection end 320 will be cut, that is, the outer dimensions of the insulating substrate 100 will be cut too small, which will obviously cause the second electrical connection end 320 to radially extend beyond the insulating substrate 100, thereby causing the coil electrode to short-circuit with the external element; and cutting the second electrical connection end 320 may also cause the second electrical connection end 320 to be cut. Therefore, in this embodiment, the second electrical connection end 320 is biased relative to the second edge 330 in the direction close to the inner circle electrode 200, thereby increasing the margin distance between the second electrical connection end 320 and the edge of the insulating base 100. In this way, when cutting the insulating substrate, even if the cutting is oblique, the risk of cutting the second electrical connection end 320 can be reduced, thereby reducing the risk of the second electrical connection end 320 being exposed to the outside of the insulating base 100 or even being cut during cutting.

[0085] After the second electrical connection end 320 is biased toward the direction close to the inner circle electrode 200, the distance between the second electrical connection end 320 and the inner circle electrode 200 will be reduced. After the distance between the second electrical connection end 320 and the inner circle electrode 200 is reduced, the electric field coupling between the inner circle electrode 200 and the outer circle electrode 300 will be enhanced, resulting in an increase in parasitic capacitance, and reducing the filtering effect of the stacked inductor element on high-frequency signals. In an optional embodiment, the inner circle electrode 200 includes a avoidance portion 220, the avoidance portion 220 and the second electrical connection end 320 are arranged opposite to each other in the first direction, and the avoidance portion 220 is inclined in the direction away from the second electrical connection end 320. Exemplarily, the avoidance portion 220 here can be in the shape of a plate.

[0086] In this embodiment, the inner circle electrode 200 includes a relief portion 220 opposite to the second electrical connection end 320 in the first direction, and the relief portion 220 is inclined in a direction away from the second electrical connection end 320, which can increase the distance between the second electrical connection end 320 and the inner circle electrode 200, thereby reducing the electric field coupling between the inner circle electrode 200 and the outer circle electrode 300, so as to reduce the parasitic capacitance. In addition, since the second electrical connection end 320 of this embodiment is located at the corner of the rectangle where the outer circle electrode 300 is located, the relief portion 220 is also located at the corner of the inner circle electrode 200. Compared with setting the relief portion 220 in the middle of the rectangular side of the inner circle electrode 200, it is easier to set the relief portion 220 at the corner, thereby simplifying the difficulty of winding the inner circle electrode 200.

[0087] In addition, arranging the avoidance portion 220 at the corner will not significantly change the shape of the inner ring electrode 200, and can make the shape of the inner ring electrode 200 more regular, so that the magnetic field generated by the inner ring electrode 200 is more evenly distributed, thereby improving the consistency and stability of the inductance and ensuring the stability of the inductance value under different working conditions.

[0088] In an optional embodiment, the inner ring electrode 200 has a third side, the third side extends along the first direction and is connected to the first electrical connection end 210, the diameter of the first electrical connection end 210 is greater than the width of the third side, and the first electrical connection end 210 is biased relative to the third side in a direction away from the outer ring electrode 300.

[0089] In this embodiment, the first electrical connection end 210 is biased relative to the third side in a direction away from the outer ring electrode 300, so that a larger distance is provided 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 to reduce parasitic capacitance.

[0090] like Figure 3 As shown, the embodiment of the present application also discloses a laminated inductor component, including:

[0091] A first lead layer 500, the first lead layer 500 is used to connect to a first terminal, a second lead layer 600, the second lead layer 600 is used to connect to a second terminal, an internal electrode assembly 700, the internal electrode assembly 700 is arranged between the first lead layer 500 and the second lead layer 600, and the internal electrode assembly 700 includes a plurality of internal electrode layers 710 which are sequentially stacked and connected along the thickness direction thereof.

[0092] At least one of the multiple internal electrode layers 710 is the coil electrode layer 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 the coil electrode layer described in any of the above embodiments. In this way, the laminated inductor element can have the beneficial effects of the above-mentioned coil electrode layer, which will not be repeated here.

[0093] The above embodiments of the present application focus on the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. Considering the simplicity of the text, they will not be repeated here. The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the enlightenment of the present application, ordinary technicians in this field can also make many forms without departing from the scope of protection of the purpose of the present application and the claims, all of which are within the protection of the present application.

Claims

1. A coil electrode layer, applied to a laminated inductor element, characterized in that: include: An insulating substrate (100), wherein the insulating substrate (100) has a first surface; An inner ring electrode (200), the inner ring electrode (200) being arranged on the first surface and winding along a rectangle; an outer ring electrode (300), the outer ring electrode (300) being arranged on the first surface and coiled along a rectangle, one end of the outer ring electrode (300) being connected to one end of the inner ring electrode (200) and being arranged around the inner ring electrode (200), and a spacing W0 being provided between the outer ring electrode (300) and the inner ring electrode (200) along a first direction, and the first direction being parallel to a first side (310) of the outer ring electrode (300); The inner ring electrode (200) has a first electrical connection end (210) disposed away from the outer ring electrode (300), and the outer ring electrode (300) has a second electrical connection end (320) disposed away from the inner ring electrode (200); The width of the inner electrode (200) and the outer electrode (300) are both W C , the distance between the first electrical connection end (210) and the second electrical connection end (320) in the first direction is W1, 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 ring electrode (200) comprises a first inner contour line (201) and a second inner contour line (202), wherein the first inner contour line (201) and the second inner contour line (202) are parallel and spaced apart along the first direction, and there is a spacing W2 between the first inner contour line (201) and the second inner contour line (202), 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: There is a distance W3 between the first electrical connection end (210) and the first inner contour line (201), W3≥0.25W2; There is a distance W4 between the first electrical connection end (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 0.02~0.04mm.

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

8. The coil electrode layer according to claim 7, characterized in that: The outer ring electrode (300) also has a second side (330), the second side (330) is a short side of the outer ring 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 midline of the second side (330).

9. The coil electrode layer according to claim 8, characterized in that: The inner ring electrode (200) comprises a first outer contour line (203) and a second outer contour line (204), the first outer contour line (203) extending along the first direction and connected to the first electrical connection end (210), and the second outer contour line (204) being perpendicular to the first outer contour line (203) and located between the first electrical connection end (210) and the second electrical connection end (320); The outer ring electrode (300) comprises 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 midline of the second side (330); The straight line on which the first outer contour line (203) is located, the straight line on which the second outer contour line (204) is located, the straight line on which the third outer contour line (301) is located, and the straight line on which the fourth outer contour line (302) is located jointly 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 end (320) is located at the corner of the rectangle where the outer ring electrode (300) is located, and the outer ring electrode (300) has a second side (330) connected to the second electrical connection end (320), the second side (330) is perpendicular to the first side (310), the diameter of the second electrical connection end (320) is greater than the width of the second side (330), and the second electrical connection end (320) is biased relative to the second side (330) in a direction close to the inner ring electrode (200).

11. The coil electrode layer according to claim 10, characterized in that: The inner ring electrode (200) comprises a relief portion (220), the relief portion (220) and the second electrical connection end (320) being arranged opposite to each other in the first direction, and the relief portion (220) being 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 number of turns of the inner ring electrode (200) is less than one turn.

13. A multilayer inductor component, characterized in that: include: A first lead-out layer (500), the first lead-out layer (500) being used to be connected to a first wiring terminal; A second lead-out layer (600), the second lead-out layer (600) being used to be connected to a second wiring terminal; An inner electrode assembly (700), wherein the inner electrode assembly (700) is disposed between the first lead-out layer (500) and the second lead-out layer (600); The internal electrode assembly (700) comprises a plurality of internal electrode layers (710) which are sequentially stacked and connected along the thickness direction of the internal electrode assembly; At least one of the plurality of internal electrode layers (710) is a coil electrode layer as described 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 described in any one of claims 1 to 12.

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