JP2013045809A - Coil component - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coil component for removing noises in plural frequency bandwidths with one component.SOLUTION: A laminate coil component 1 comprises: an element assembly 3 formed by laminating plural insulator layers 30-41; terminal electrodes 5, 7 arranged at both ends of the element assembly 3; a first coil 10 arranged inside the element assembly 3 and connected to the terminal electrodes 5, 7; and a second coil 10 arranged inside the element assembly 3, connected only to the terminal electrode 5, and not connected to the terminal electrode 7. The first and second coils 10, 20 are arranged in a vertical direction to be opposed to each other in a lamination direction of the insulator layers 30-41, and the second coil 20 forms a stray capacitance Cs in the second coil 20.

Description

  The present invention relates to a coil component.

  As a LC composite component used for a high frequency filter circuit or the like, a three-terminal LC composite component including a capacitor portion and an inductor portion is known (see, for example, Patent Document 1). In order to obtain a noise reduction effect, a two-terminal coil component including a coil and a conductor portion facing the coil is known (see, for example, Patent Document 2).

JP-A-11-026294 Japanese Patent Laid-Open No. 06-061053

  By the way, since the components described above have a single resonance point, only one frequency band of noise to be removed can be selected, and a plurality of components are necessary when noise in a plurality of frequency bands is to be removed. Met. Therefore, a configuration in which the three-terminal LC composite component described in Patent Document 1 can have a plurality of resonance points has been studied.

  However, in a three-terminal LC composite component, a connection terminal for the ground terminal is separately required on the circuit board side. Therefore, when the noise countermeasure is required in the actual circuit design, the connection terminal for the ground terminal is connected to the circuit. When a new circuit board is provided, there is a problem that the circuit board must be redesigned in some cases. Therefore, a two-terminal component that does not require such a connection terminal and a component that can remove noise in a plurality of frequency bands is desired.

  An object of this invention is to provide the coil components which can remove the noise in a several frequency band by one component.

  The coil component according to the present invention includes an element body formed by laminating a plurality of insulator layers, first and second terminal electrodes respectively disposed at both ends of the element body, and is disposed inside the element body. A first coil connected to the first and second terminal electrodes, and a second coil disposed inside the element body and connected to the first terminal electrode and not connected to the second terminal electrode, And the second coil forms a stray capacitance in the second coil.

  In the coil component according to the present invention, the second coil having one open end forms a stray capacitance in the second coil. It is difficult to form two LC resonance circuits in one component simply by providing a second coil that is open at one end. However, by adopting such a configuration, the LC resonance circuit is formed in two components in one component. Can be formed. As a result, according to the coil component according to the present invention, two resonance points can be provided, and noise in two frequency bands can be removed by one component. That is, a bipolar trap can be easily formed with a two-terminal coil component.

  In the coil component described above, the first and second coils are preferably arranged vertically so as to face each other in the stacking direction of the insulator layers. In this case, the second coil can be easily formed.

  In the coil component described above, the number of turns of the second coil may be larger than the number of turns of the first coil. In this case, since the attenuation on the high frequency side can be deepened, the second resonance point can be easily provided.

  In the coil component described above, each of the lead portions of the first and second coils to the first terminal electrode may overlap at least partially when viewed from the stacking direction. In this case, the stray capacitance between the first coil and the second coil can be increased.

  In the above coil component, the lead portions of the first and second coils to the first terminal electrode may not overlap each other when viewed from the stacking direction. In this case, the stray capacitance between the first coil and the second coil can be reduced.

  In the above-described coil component, the lead portions to the first terminal electrodes of the first and second coils may be common. In this case, since the layer forming the lead portion can be shared, the number of turns of the first or second coil can be increased correspondingly, and the height of the coil component can be reduced.

  In the above-described coil component, the first and second coils may have different winding directions when viewed from the stacking direction. In this case, the two resonance points can be more clearly separated compared to the coil component having the same winding direction, and a clear two-pole trap configuration can be obtained.

  The coil component further includes a third coil disposed inside the element body and connected to the first terminal electrode and not connected to the second terminal electrode, wherein the second and third coils are stacked in the stacking direction. In this case, the first coil may be disposed so as to sandwich the first coil. In this case, three LC resonance circuits can be formed in one component, and noise in three frequency bands can be removed by one component.

  In the coil component described above, the second coil may be arranged inside the first coil. In this case, it is possible to reduce the height of the coil component.

  According to the present invention, it is possible to provide a coil component that removes noise in a plurality of frequency bands with a single component.

It is a perspective view of the multilayer coil component which concerns on 1st Embodiment. It is the II-II sectional view taken on the line of the laminated coil component shown in FIG. FIG. 2 is a developed perspective view of an element body included in the laminated coil component shown in FIG. 1. It is a perspective view which shows the 1st and 2nd coil comprised by the coil conductor etc. which were shown in FIG. It is a figure which shows the stray capacitance which generate | occur | produces in the laminated coil components shown in FIG. It is a figure which shows the equivalent circuit of the laminated coil component shown in FIG. 5 is a cross-sectional view of a laminated coil component that is Comparative Example 1. It is a perspective view which shows the 1st and 2nd coil comprised by the coil conductor etc. which were shown in FIG. It is a figure which shows the difference in the attenuation | damping characteristic of the multilayer coil component which concerns on 1st Embodiment, and the multilayer coil component of the comparative example 1. FIG. It is sectional drawing of the laminated coil component which concerns on 2nd Embodiment. It is a perspective view which shows the 1st and 2nd coil comprised by the coil conductor etc. which were shown in FIG. It is sectional drawing of the multilayer coil component which concerns on 3rd Embodiment. It is a perspective view which shows the 1st and 2nd coil comprised by the coil conductor etc. which were shown in FIG. It is sectional drawing of the laminated coil component which concerns on 4th Embodiment. It is a perspective view which shows the 1st and 2nd coil comprised by the coil conductor etc. which were shown in FIG. It is a typical perspective view of the laminated coil component for a comparative test. It is a figure which shows the difference in the attenuation | damping characteristic of each laminated coil component shown in FIG. It is a perspective view which shows the laminated coil component which concerns on 5th Embodiment. It is a figure which shows the difference in the attenuation | damping characteristic of the laminated coil components which concern on 1st and 5th embodiment. It is sectional drawing of the laminated coil components in which winding frequency was varied. It is a figure which shows the difference in the attenuation | damping characteristic of each laminated coil component shown in FIG. It is a typical top view which shows the modification of laminated coil components. It is a figure which shows the difference in the attenuation | damping characteristic of the laminated coil components shown in FIG. It is a perspective view which shows another modification of laminated coil components.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description, the same reference numerals are used for the same elements or elements having the same function, and redundant description is omitted.

[First Embodiment]
First, with reference to FIGS. 1-3, the structure of the laminated coil component 1 which concerns on 1st Embodiment is demonstrated. The laminated coil component 1 is a laminated chip bead mounted on the surface of a circuit board (not shown). The element body 3, the terminal electrodes 5 and 7, the first coil 10, the second coil 20, It is configured with. The first and second coils 10 and 20 are disposed in the element body 3.

  As shown in FIG. 1, the element body 3 includes a pair of end faces 3a and 3b facing in the longitudinal direction and parallel to each other, and a pair of main faces extending to connect the pair of end faces 3a and 3b and facing each other. It has surfaces 3c, 3d and a pair of side surfaces 3e, 3f extending so as to connect the pair of main surfaces 3c, 3d and facing each other. One of the main surfaces 3c and 3d becomes a mounting surface corresponding to the circuit board when the laminated coil component 1 is mounted on the circuit board.

  The terminal electrode 5 is formed so as to cover one end surface 3 a and part of each edge of the main surfaces 3 c and 3 d and the side surfaces 3 e and 3 f orthogonal to the end surface 3 a, and is disposed at one end of the element body 3. The terminal electrode 7 is formed so as to cover a part of each edge of the main surface 3c, 3d and the side surfaces 3e, 3f orthogonal to the other end surface 3b and the end surface 3b, and is disposed at the other end of the element body 3. . The terminal electrodes 5 and 7 are multi-layered. For example, Cu, Ni, Ag—Pd or the like is used for the inner layer in contact with the element body 3, and plating such as Ni—Sn is used for the outer layer. Is given.

  As shown in FIGS. 2 and 3, the element body 3 is a laminated body configured by laminating a plurality of insulator layers 30 to 41. In the element body 3, there are a first coil 10 composed of lead portions 11 and 15, coil conductors 12 to 14 and through-hole conductors 16 to 19, a lead portion 21, coil conductors 22 to 24, and through-hole conductors 25 to 25. A second coil 20 comprising 27 is disposed. The element body 3 is formed by firing the insulator layers 30 to 41 in which the coil conductors 12 to 14 and 22 to 24 are formed. In the actual laminated coil component 1, the layers of the insulator layers 30 to 41 are It is integrated to the extent that it cannot be seen.

  The insulator layers 30 to 41 are insulators having electrical insulation, and are made of a fired product of an insulator green sheet. The insulator layers 30 to 41 are made of, for example, a glass-based ceramic made of glass and alumina made of strontium, calcium, alumina, and silicon oxide. The insulator layers 30 to 41 may be made of ferrite (for example, Ni—Cu—Zn based ferrite, Ni—Cu—Zn—Mg based ferrite, Cu—Zn based ferrite, or Ni—Cu based ferrite). . The thickness of the insulator layers 30 to 41 is, for example, about 5 μm to 30 μm.

  The lead portion 11 is a portion for leading the first coil 10 to the terminal electrode 5, and is formed on the first end face 3 a side on the insulator layer 36. One end of the lead portion 11 is drawn to the edge of the insulator layer 36 and exposed to the first end face 3 a of the element body 3. The other end of the lead portion 11 is electrically connected to the through-hole conductor 16 formed so as to penetrate the insulator layer 36 in the thickness direction. The lead portion 11 is electrically connected to the terminal electrode 5 at a portion exposed at the first end surface 3a. In addition, the lead portion 11 is electrically connected to one end of the adjacent coil conductor 12 through the through-hole conductor 16 in a stacked state.

  The coil conductor 12 corresponds to approximately 1/2 turn of the first coil 10 and is formed in a substantially C shape on the insulator layer 37. One end of the coil conductor 12 includes a region electrically connected to the through-hole conductor 16 in a stacked state. The other end of the coil conductor 12 is electrically connected to a through-hole conductor 17 formed through the insulator layer 37 in the thickness direction. The coil conductor 12 is electrically connected to the other end of the adjacent coil conductor 13 through the through-hole conductor 17 in a stacked state.

  The coil conductor 13 corresponds to approximately ½ turn of the first coil 10 and is formed in a substantially inverted C shape on the insulator layer 38. The other end of the coil conductor 13 includes a region electrically connected to the through-hole conductor 17 in a stacked state. One end of the coil conductor 13 is electrically connected to the through-hole conductor 18 formed through the insulator layer 38 in the thickness direction. The coil conductor 13 is electrically connected to one end of the adjacent coil conductor 14 through the through-hole conductor 18 in a stacked state.

  The coil conductor 14 corresponds to approximately ½ turn of the first coil 10, and is formed in a substantially C shape on the insulator layer 39. One end of the coil conductor 14 includes a region electrically connected to the through-hole conductor 18 in a stacked state. The other end of the coil conductor 14 is electrically connected to a through-hole conductor 19 formed through the insulator layer 39 in the thickness direction. The coil conductor 14 is electrically connected to one end of the adjacent lead portion 15 through the through-hole conductor 19 in a stacked state.

  The lead portion 15 is a portion for leading the first coil 10 to the terminal electrode 7, and is formed on the second end face 3 b side on the insulator layer 40. One end of the lead portion 15 includes a region electrically connected to the through-hole conductor 19 in a stacked state. The other end of the lead portion 15 is drawn to the edge of the insulator layer 40 and exposed to the second end face 3 b of the element body 3. The lead portion 15 is electrically connected to the terminal electrode 7 at a portion exposed at the second end surface 3b.

  Thus, each insulator layer 36-41 is laminated | stacked, and each drawer | drawing-out part 11 and 15 and each coil conductor 12-14 are connected via each through-hole conductors 16-19, and are shown by FIG. Thus, the 1st coil 10 whose number of turns (number of turns) is 1.5 turns is constituted. The first coil 10 is connected to the terminal electrodes 5 and 7. Each of the lead portions 11 and 15, each of the coil conductors 12 to 14 and each of the through-hole conductors 16 to 19 is formed of a conductive paste whose main component is Ag, Cu, Ni, or the like. The same applies to the main components of each component of the second coil 20 described below.

  The lead portion 21 is a portion for leading the second coil 20 to the terminal electrode 5, and is formed on the first end face 3 a side on the insulator layer 31. One end of the lead portion 21 is drawn to the edge of the insulator layer 31 and exposed to the first end face 3 a of the element body 3. The other end of the lead portion 21 is electrically connected to a through-hole conductor 25 formed through the insulator layer 31 in the thickness direction. The lead portion 21 is electrically connected to the terminal electrode 5 at a portion exposed at the first end surface 3a. In addition, the lead portion 21 is electrically connected to one end of the adjacent coil conductor 22 through the through-hole conductor 25 in a stacked state.

  The coil conductor 22 corresponds to approximately ½ turn of the second coil 20 and is formed in a substantially C shape on the insulator layer 32. One end of the coil conductor 22 includes a region that is electrically connected to the through-hole conductor 25 in a stacked state. The other end of the coil conductor 22 is electrically connected to a through-hole conductor 26 formed through the insulator layer 32 in the thickness direction. The coil conductor 22 is electrically connected to the other end of the adjacent coil conductor 23 through the through-hole conductor 26 in a stacked state.

  The coil conductor 23 corresponds to approximately ½ turn of the second coil 20 and is formed in a substantially inverted C shape on the insulator layer 33. The other end of the coil conductor 23 includes a region electrically connected to the through-hole conductor 26 in a stacked state. One end of the coil conductor 23 is electrically connected to a through-hole conductor 27 formed through the insulator layer 33 in the thickness direction. The coil conductor 23 is electrically connected to one end of the adjacent coil conductor 24 through the through-hole conductor 27 in a stacked state.

  The coil conductor 24 corresponds to approximately ½ turn of the second coil 20, and is formed in a substantially C shape on the insulator layer 34. One end of the coil conductor 24 includes a region electrically connected to the through-hole conductor 27 in a stacked state. On the other hand, the other end of the coil conductor 24 (the open end of the second coil 20) is not directly connected to any through-hole conductor or lead portion. Thereby, the second coil 20 is configured not to be connected to the terminal electrode 7.

  Thus, each insulator layer 30-35 is laminated | stacked, and the drawer | drawing-out part 21 and each coil conductor 22-24 are connected via each through-hole conductor 25-27, As shown in FIG. A second coil 20 having 1.5 turns is configured. The second coil 20 is connected to the terminal electrode 5 but is open at one end not connected to the terminal electrode 7. As shown in FIGS. 2 and 4, the first and second coils 10 and 20 are arranged so as to be up and down in the stacking direction of the insulator layers 30 to 41, and face each other in the stacking direction. Is arranged. Note that the lead-out portion 11 of the first coil 10 and the lead-out portion 21 of the second coil 20 are substantially overlapped when viewed from the stacking direction.

  Then, the manufacturing method of the laminated coil component 1 is demonstrated.

  First, an insulator green sheet for forming the insulator layers 30 to 41 is prepared. The insulator green sheet constitutes the insulator layers 30 to 41 of the laminated coil component 1 by being fired. The insulating green sheet is formed by applying a coating material for an insulating green sheet on a substrate such as a PET (polyethylene terephthalate) film by a doctor blade method or the like and then drying it. The insulating green sheet paint contains the above-mentioned glass-based ceramic powder, a binder resin, and a binder resin solvent.

  Next, a through hole is formed in the insulator green sheet. A through hole is formed by irradiating a predetermined position of the insulator green sheet, that is, a position where the above-described through-hole conductors 16 to 19 and 25 to 27 are to be formed, with laser light. As the laser, for example, a carbon dioxide laser or a YAG laser can be used.

  Next, a conductive paste is applied to the insulator green sheet, and conductor patterns constituting the lead portions 11, 15, 21 and the coil conductors 12-14, 22-24 are formed on the insulator green sheet after firing. In the application of the conductive paste, the conductive paste is filled into the through holes formed in the insulator green sheet together with the formation of the conductor pattern. As the conductive paste, for example, a metal powder containing the above-described metal as a main component and glass frit and an organic vehicle mixed can be used.

  Formation of the conductor pattern and filling of the through hole with the conductive paste is performed by screen printing or the like. The degree of filling of the conductive paste into the through hole can be controlled by adjusting the paste viscosity, the squeegee pressure during printing, and the like. The conductor pattern formed on the insulator green sheet and the conductive paste filled in the through hole are integrated. For this reason, the drawer | drawing-out part 11,15,21 and the coil conductors 12-14,22-24 and the through-hole conductors 16-19,25-27 will be integrally formed simultaneously by baking mentioned later.

  Next, the insulator green sheet on which the conductor pattern is formed is peeled off from the base material and laminated so as to be in the lamination order shown in FIG. After laminating the insulator green sheets, pressure is applied from the laminating direction to obtain a green laminate. Thereafter, the green laminate is cut into chips of a predetermined size with a cutting machine to obtain green chips. The obtained green chip may be barrel-polished to round the ridge of the green chip.

  Next, after removing the binder resin contained in each part from the green chip, the green chip is fired. By this firing, the insulator layers 30 to 41 from the insulator green sheet, and the lead portions 11, 15, and 21 and the coil conductors 12 to 14, 22 to 24 from the conductor pattern were filled in the through holes. The element body 3 in which the through-hole conductors 16 to 19 and 25 to 27 are respectively formed is obtained from the conductor paste. The obtained element body 3 may be barrel-polished to reliably expose the lead portions 11, 15, and 21 on the outer surface.

  Next, a conductive paste is applied to the outer surface of the element body 3, and the conductive paste is baked on the element body 3 by performing heat treatment to form the terminal electrodes 5 and 7. As the conductive paste, for example, a metal powder mainly composed of Cu mixed with glass frit and an organic vehicle can be used. The metal powder may contain Ni, Ag—Pd or Ag as a main component. Plating may be performed on the electrode formed by baking the conductive paste. For the plating, metal plating such as Ni, Sn, Ni—Sn alloy, Sn—Ag alloy, Sn—Bi alloy or the like can be performed. For example, the metal plating may have a multilayer structure in which two or more layers of Ni and Sn are formed.

  Through the above steps, the laminated coil component 1 shown in FIGS. 1 to 4 is obtained.

  Here, the effect in the laminated coil component 1 is demonstrated.

  First, as a comparative example for explaining the operation effect of the multilayer coil component 1, the multilayer coil component 1a of the comparative example 1 in which both the first and second coils 10 and 20a are connected to the terminal electrodes 5 and 7 is prepared. To do. In the laminated coil component 1a of the comparative example 1, as shown in FIGS. 7 and 8, the second coil 20a is added to the lead portion 21, the coil conductors 22 to 24, and the through-hole conductors 25 to 27, and further. The through-hole conductor 28 and the lead-out portion 29 are provided, whereby the second coil 20 a is also connected to the terminal electrodes 5 and 7.

  And when the attenuation characteristic of the laminated coil component 1a of this comparative example 1 and the laminated coil component 1 mentioned above was calculated by simulation, the result as shown in FIG. 9 was obtained. That is, in the laminated coil component 1a in which both the coils 10 and 20a are connected to the terminal electrodes 5 and 7, although two coils are provided, there is only an effect of removing noise in one frequency band as in the conventional case. On the other hand, in the laminated coil component 1 in which one coil 20 is open at one end, unlike the conventional case, the effect is obtained that noise in two frequency bands can be removed.

  As described above, in the laminated coil component 1, the second coil 20 having one open end is arranged vertically so as to face the first coil 10, thereby removing noise in two frequency bands by one component. It is possible to do. That is, according to the present embodiment, a two-pole trap can be easily formed with a two-terminal coil component. Note that the noise in the two frequency bands can be removed by the configuration in which one coil 20 is open at one end and faces the first coil 10 as described above, as shown in FIG. This is probably because the stray capacitance Cs is formed between the coil conductors 22 to 24 of the second coil 20.

By forming the stray capacitance Cs as described above, the multilayer coil component 1 realizes a configuration in which two parallel resonant circuits as shown in the equivalent circuit diagram of FIG. 6A are arranged in series. Is able to. More precisely, as shown in FIG. 6 (b), in the laminated coil component 1, a first coil 10 arranged in parallel with the capacitive component C _1, the are arranged in parallel with the capacitance component C ₂ The second coil 20 is coupled, and a capacitance component C ₃ is formed between the open one end of the second coil 20 and the end of the terminal electrode 7 or the first coil 10 on the terminal electrode 7 side. It is comprised so that.

  In the laminated coil component 1, the first and second coils 10 and 20 are arranged so as to face each other in the lamination direction of the insulator layers 30 to 41. For this reason, it is possible to easily form the second coil in order to achieve a noise removal effect in two frequency bands.

  Further, in the laminated coil component 1, each of the lead portions 11 and 21 to the terminal electrode 5 of the first and second coils 10 and 20 is substantially overlapped when viewed from the lamination direction. . For this reason, the stray capacitance between the first coil 10 and the second coil 20 can be increased.

[Second Embodiment]
Next, with reference to FIG.10 and FIG.11, the laminated coil component 1b which concerns on 2nd Embodiment is demonstrated. In the laminated coil component 1b according to the present embodiment, the arrangement order of the constituent members of the second coil 20b in the lamination direction is different from that of the coil 20 of the first embodiment, and the lead portion 21b is arranged in the lamination direction. It is located on the side (downward in FIG. 10). Hereinafter, a description will be given focusing on differences from the first embodiment.

  The laminated coil component 1b includes an element body 3, terminal electrodes 5 and 7, a first coil 10, and a second coil 20b. Inside the element body 3, a first coil 10 made of coil conductors 12 to 14 and the like, and a second coil 20b made of lead portions 21b, coil conductors 22b to 24b and through-hole conductors 25b to 27b are arranged. ing.

  The lead portion 21 b is a portion for leading the second coil 20 b to the terminal electrode 5, and one end thereof is exposed on the first end face 3 a of the element body 3. The other end of the lead portion 21b is electrically connected to a through-hole conductor 25b formed through the insulator layer disposed above in the thickness direction. The lead portion 21b is electrically connected to one end of the adjacent coil conductor 22b through the through-hole conductor 25b.

  The coil conductor 22b corresponds to approximately ½ turn of the second coil 20b and is formed in a substantially C shape. One end of the coil conductor 22b is electrically connected to the through-hole conductor 25b, and the other end is electrically connected to a through-hole conductor 26b formed through the insulator layer in the thickness direction. The coil conductor 22b is electrically connected to the other end of the adjacent coil conductor 23b through the through-hole conductor 26b.

  The coil conductor 23b corresponds to approximately ½ turn of the second coil 20b and is formed in a substantially inverted C shape. The other end of the coil conductor 23b is electrically connected to the through-hole conductor 26b, and one end is electrically connected to a through-hole conductor 27b formed through the insulator layer in the thickness direction. The coil conductor 23b is electrically connected to one end of the adjacent coil conductor 24b through the through-hole conductor 27b.

  The coil conductor 24b corresponds to approximately 1/2 turn of the second coil 20b and is formed in a substantially C shape. One end of the coil conductor 24b is electrically connected to the through-hole conductor 27b, and the other end is not directly connected to any through-hole conductor or lead portion. Thereby, the 2nd coil 20b becomes a structure which is not connected to the terminal electrode 7 similarly to 1st Embodiment.

  Thus, in the laminated coil component 1b, similarly to the first embodiment, the second coil 20b whose one end is open is arranged up and down so as to face the first coil 10, so that by one component, Noise in two frequency bands can be removed. In the laminated coil component 1b, the lead portions 11 and 21b of the first and second coils 10 and 20b to the terminal electrode 5 are arranged closer to each other in the lamination direction than in the first embodiment. Yes. With such an arrangement, the stray capacitance between the first coil 10 and the second coil 20b can be made different from that of the first embodiment.

[Third Embodiment]
Next, with reference to FIG.12 and FIG.13, the laminated coil component 1c which concerns on 3rd Embodiment is demonstrated. In the laminated coil component 1c according to the present embodiment, the end face from which the second coil 20c is drawn is different from the coil 20 of the first embodiment, and is drawn out to the second end face 3b. Hereinafter, a description will be given focusing on differences from the first embodiment.

  The laminated coil component 1c includes an element body 3, terminal electrodes 5 and 7, a first coil 10, and a second coil 20c. Inside the element body 3, a first coil 10 and a second coil 20c including a lead portion 21c, coil conductors 22c to 24c, and through-hole conductors 25c to 27c are arranged.

  The lead portion 21 c is a portion for leading the second coil 20 c to the terminal electrode 7, and the other end is exposed at the second end face 3 b of the element body 3. One end of the lead portion 21c is electrically connected to a through-hole conductor 25c formed through the insulator layer in the thickness direction. The lead portion 21c is electrically connected to the other end of the adjacent coil conductor 22c through the through-hole conductor 25c.

  The coil conductor 22c corresponds to approximately 1/2 turn of the second coil 20c and is formed in a substantially C shape. The other end of the coil conductor 22c is electrically connected to the through-hole conductor 25c, and one end is electrically connected to a through-hole conductor 26c formed through the insulator layer in the thickness direction. The coil conductor 22c is electrically connected to one end of the adjacent coil conductor 23c through the through-hole conductor 26c.

  The coil conductor 23c corresponds to approximately ½ turn of the second coil 20c, and is formed in a substantially inverted C shape. One end of the coil conductor 23c is electrically connected to the through-hole conductor 26c, and the other end is electrically connected to a through-hole conductor 27c formed through the insulator layer in the thickness direction. The coil conductor 23c is electrically connected to the other end of the adjacent coil conductor 24c through the through-hole conductor 27c.

  The coil conductor 24c corresponds to approximately ½ turn of the second coil 20c, and is formed in a substantially C shape. The other end of the coil conductor 24c is electrically connected to the through-hole conductor 27c, and one end is not directly connected to any through-hole conductor or lead portion. Thereby, the second coil 20 c is not connected to the terminal electrode 5.

  Thus, in the laminated coil component 1c, as in the first embodiment and the like, the second coil 20c with one end open is arranged vertically so as to face the first coil 10, so that one component Noise in two frequency bands can be removed. In the laminated coil component 1c, the lead portions 15 and 21c of the first and second coils 10 and 20 to the terminal electrode 7 are disposed so as to be farther in the lamination direction than in the first embodiment. . Further, since the second coil 20c is not drawn out to the first end face 3a, the lead-out portions of the first and second coils 10 and 20c to the terminal electrode 5 do not overlap each other. For this reason, in the laminated coil component 1c, the stray capacitance between the first and second coils 10 and 20 can be reduced as compared with the first embodiment.

[Fourth Embodiment]
Next, with reference to FIG.14 and FIG.15, the laminated coil component 1d which concerns on 4th Embodiment is demonstrated. In the laminated coil component 1d according to the present embodiment, the first and second coils of the first embodiment are common in that the lead portion 11d that pulls out the first and second coils 10d and 20d to the terminal electrode 7 is common. 10 and 20 are different. Hereinafter, a description will be given focusing on differences from the first embodiment.

  The laminated coil component 1d includes an element body 3, terminal electrodes 5 and 7, a first coil 10d, and a second coil 20d. Inside the element body 3 are a first coil 10d composed of lead portions 11d and 15d, coil conductors 12d to 14d and through-hole conductors 16d to 19d, and lead portion 11d, coil conductors 22d to 24d and through-hole conductors 25d to 25d. A second coil 20d made of 27d is arranged.

  The lead portion 11 d is a common portion for drawing the first and second coils 10 d and 20 d to the terminal electrode 7. The other end of the lead portion 11 d is exposed to the second end surface 3 b of the element body 3 and is electrically connected to the terminal electrode 7. One end of the lead portion 11d is electrically connected to through-hole conductors 16d and 25d formed through the insulating layers positioned above and below in the thickness direction. The lead portion 11d is electrically connected to the other end of the lower coil conductor 12d via the through-hole conductor 16d, and the other end of the coil conductor 22d adjacent to the upper side through the through-hole conductor 25d. And electrically connected.

  The coil conductor 12d corresponds to approximately ½ turn of the first coil 10d, and is formed in a substantially C shape. The other end of the coil conductor 12d is electrically connected to the through-hole conductor 16d, and one end is electrically connected to a through-hole conductor 17d formed through the insulator layer in the thickness direction. The coil conductor 12d is electrically connected to one end of the adjacent coil conductor 13d through the through-hole conductor 17d.

  The coil conductor 13d corresponds to approximately 1/2 turn of the first coil 10d and is formed in a substantially inverted C shape. One end of the coil conductor 13d is electrically connected to the through-hole conductor 17d, and the other end is electrically connected to a through-hole conductor 18d formed through the insulator layer in the thickness direction. The coil conductor 13d is electrically connected to the other end of the adjacent coil conductor 14d through the through-hole conductor 18d.

  The coil conductor 14d corresponds to approximately ½ turn of the first coil 10d and is formed in a substantially C shape. The other end of the coil conductor 14d is electrically connected to the through-hole conductor 18d, and one end is electrically connected to a through-hole conductor 19d formed through the insulator layer in the thickness direction. The coil conductor 14d is electrically connected to the other end of the adjacent lead portion 15d through the through-hole conductor 19d.

  The lead portion 15 d is a portion for pulling out the first coil 10 d to the terminal electrode 5. The other end of the lead portion 15 d is electrically connected to the through-hole conductor 19, and one end is exposed to the first end surface 3 a of the element body 3 and is electrically connected to the terminal electrode 5.

  The coil conductor 22d corresponds to approximately ½ turn of the second coil 20d and is formed in a substantially C shape. The other end of the coil conductor 22d is electrically connected to the through-hole conductor 25d, and one end is electrically connected to a through-hole conductor 26d formed through the insulator layer in the thickness direction. The coil conductor 22d is electrically connected to one end of the adjacent coil conductor 23d through the through-hole conductor 26d.

  The coil conductor 23d corresponds to approximately ½ turn of the second coil 20d and is formed in a substantially inverted C shape. One end of the coil conductor 23d is electrically connected to the through-hole conductor 26d, and the other end is electrically connected to a through-hole conductor 27d formed through the insulator layer in the thickness direction. The coil conductor 23d is electrically connected to one end of the adjacent coil conductor 24d through the through-hole conductor 27d.

  The coil conductor 24d corresponds to approximately ½ turn of the second coil 20d and is formed in a substantially C shape. The other end of the coil conductor 24d is electrically connected to the through-hole conductor 27d, and one end is not directly connected to any through-hole conductor or lead-out portion. As a result, the second coil 20 d is not connected to the terminal electrode 5.

  As described above, in the laminated coil component 1d, as in the first embodiment, the second coil 20d having one open end is arranged up and down so as to face the first coil 10d. Noise in two frequency bands can be removed.

  Further, the laminated coil component 1d has a configuration in which the lead portion 11d to the terminal electrode 7 of the first and second coils 10d and 20d is common. For this reason, since the layer forming the lead portion 11d can be shared, the number of turns of the first or second coil 10d, 20d can be increased by that amount, or the thickness of the laminated coil component 1d can be reduced. .

  Here, as shown in FIG. 16, a conventional laminated coil component 1e composed of one coil 10 (conventional example 1), a laminated coil component 1a in which two coils are connected to both terminal electrodes (comparative example 1), FIG. 17 shows the result of a simulation of the difference in action and effect by comparing the attenuation characteristics of the multilayer coil component 1 according to the first embodiment and the multilayer coil component 1d according to the fourth embodiment. As is clear from the simulation results shown in FIG. 17, the conventional multilayer coil component 1e and the multilayer coil component 1a of Comparative Example 1 can remove only noise in one frequency band, whereas the first and fourth implementations. In the laminated coil components 1 and 1d according to the embodiment, it is possible to obtain an operational effect that noises in two frequency bands can be removed.

[Fifth Embodiment]
Next, with reference to FIG. 18, the laminated coil component 1f according to the fifth embodiment will be described. In the laminated coil component 1f according to this embodiment, the winding direction of the second coil 20f is opposite to that of the coil 20 of the first embodiment, and the first and second coils 10 are viewed from the lamination direction. , 20f are different in winding direction. Hereinafter, a description will be given focusing on differences from the first embodiment.

  The laminated coil component 1f includes an element body 3, terminal electrodes 5 and 7, a first coil 10, and a second coil 20f. Inside the element body 3, a first coil 10 and a second coil 20 f including a lead portion 21, coil conductors 22 f to 24 f and through-hole conductors 25 f to 27 f are arranged.

  The coil conductor 22f corresponds to approximately ½ turn of the second coil 20f, and is formed in a substantially inverted C shape. One end of the coil conductor 22f is electrically connected to the through-hole conductor 25f, and the other end is electrically connected to the through-hole conductor 26f. The coil conductor 22f is electrically connected to the other end of the adjacent coil conductor 23f through the through-hole conductor 26f.

  The coil conductor 23f corresponds to approximately ½ turn of the second coil 20f, and is formed in a substantially C shape. The other end of the coil conductor 23f is electrically connected to the through-hole conductor 26f, and one end is electrically connected to the through-hole conductor 27f. The coil conductor 23f is electrically connected to one end of the adjacent coil conductor 24f through the through-hole conductor 27f.

  The coil conductor 24f corresponds to approximately ½ turn of the second coil 20f and is formed in a substantially inverted C shape. One end of the coil conductor 24f is electrically connected to the through-hole conductor 27f, and the other end is not directly connected to any through-hole conductor or lead portion. As a result, the second coil 20 f is not connected to the terminal electrode 7.

  As described above, in the laminated coil component 1f, as in the first embodiment and the like, the second coil 20f having one open end is arranged up and down so as to face the first coil 10. Noise in two frequency bands can be removed.

  In the laminated coil component 1f according to the present embodiment, the winding directions of the first and second coils 10 and 20f are different from each other. Thus, by making the winding direction different, as shown in FIG. 19, the laminated coil component 1 f (the winding direction is different) as compared with the laminated coil component 1 according to the first embodiment (the winding direction is the same). Then, the two resonance points can be clearly separated, and a clear two-trap configuration can be obtained.

  The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the above-described embodiments, and various modifications are possible. For example, in the above-described embodiment, the number of turns of the first and second coils 10 and 20 is 1.5 as an example, but the number of turns is not limited to this, and the number of turns is not limited to this. Of course you can do more. Moreover, in the said embodiment, although the number of turns of the 1st and 2nd coils 10 and 20 etc. was made the same, the number of turns may differ between coils.

  For example, in the configuration of the laminated coil component 1 according to the first embodiment, the number of turns may be changed as shown in FIG. That is, as in the laminated coil component 1g shown in FIG. 20A, the number of turns of the first coil 10g connected at both ends is 3.5, and the number of turns of the second coil 20g open at one end is 4.5. It is good. 20B, the number of turns of the first coil 10h connected at both ends is 4.5, and the number of turns of the second coil 20h open at one end is 3.5, as in the laminated coil component 1h shown in FIG. It is good.

  If the number of turns is changed between the first and second coils while keeping the total number of turns in this way, for example, as shown in FIG. 21, the laminated coil shown in FIG. The component 1g (coil 3.5Ts) can also exhibit an effect that the attenuation on the high frequency side can be deeper than the laminated coil component 1h (dummy 3.5Ts) shown in FIG. 20B. That is, by increasing the number of turns of the second coil 20g as compared with the first coil 10g, the attenuation on the high frequency side can be deepened.

  In addition, the width of the coil conductors 22 to 24 in the above embodiment may be increased as shown in FIG. 22B so as to be thicker than the width of the coil conductor 12 of the first coil 10. Thus, by increasing the widths of the coil conductors 22 to 24 to form the coil conductors 22j to 24j, for example, the stray capacitance is increased or the resonance point is moved to the low frequency side as shown in FIG. It can also be shifted. Further, the width of the coil conductors 22 to 24 may be narrower than the width of the coil conductor 12 of the first coil 10.

  Moreover, in the said embodiment, although the 1st and 2nd coils 10 and 20 showed the example arrange | positioned facing each other so that it might become up and down in the lamination direction, as FIG. 24 shows, the 1st coil It is good also as a structure which provides the 2nd coil 20k inside 10k. Even in this case, the stray capacitance can be formed in the second coil 20k by arranging the second coil 20k, which is open at one end, at a location different from the first coil 10k. One component can remove noise in two frequency bands. In this case, the laminated coil component can be reduced in height.

  Moreover, in the said implementation mobile phone, it was set as the structure which provided the 2nd coil 20 with one end open, However, The 3rd coil with one end open of the structure similar to the 2nd coil 20 is further provided, 2nd and 2nd The three coils may be arranged so as to sandwich the first coil 10 in the stacking direction. With such a configuration, three LC resonance circuits can be formed in one component, and noise in three frequency bands can be removed by one component.

  1, 1b to 1d, 1f to 1h, 1k ... laminated coil parts, 3 ... element body, 5, 7 ... terminal electrode, 10, 10d, 10k ... first coil, 20, 20b-20d, 20f-20h, 20k ... second coil.

Claims (9)

An element body formed by laminating a plurality of insulator layers;
First and second terminal electrodes respectively disposed at both ends of the element body;
A first coil disposed inside the element body and connected to the first and second terminal electrodes;
A second coil disposed inside the element body, connected to the first terminal electrode and not connected to the second terminal electrode, and
The coil component, wherein the second coil forms a stray capacitance in the second coil.   2. The coil component according to claim 1, wherein the first and second coils are arranged vertically so as to face each other in the stacking direction of the insulator layers.   The coil component according to claim 1 or 2, wherein the number of turns of the second coil is greater than the number of turns of the first coil.   Each of the lead portions of the first and second coils to the first terminal electrode overlaps at least partially when viewed from the stacking direction of the insulator layer. The coil component according to any one of the above.   4. The lead portion of each of the first and second coils to the first terminal electrode does not overlap each other when viewed from the stacking direction of the insulator layer. The coil component according to claim 1.   The coil component according to any one of claims 1 to 3, wherein a lead-out portion of the first and second coils to the first terminal electrode is common.   The coil component according to any one of claims 1 to 6, wherein the first and second coils have different winding directions when viewed from the stacking direction of the insulator layers. . A third coil disposed inside the element body, connected to the first terminal electrode and not connected to the second terminal electrode;
The coil component according to any one of claims 1 to 7, wherein the second and third coils are arranged so as to sandwich the first coil in the stacking direction. The coil component according to claim 1, wherein the second coil is disposed inside the first coil.

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