WO2022220031A1 - 積層セラミックコンデンサ - Google Patents
積層セラミックコンデンサ Download PDFInfo
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- WO2022220031A1 WO2022220031A1 PCT/JP2022/013409 JP2022013409W WO2022220031A1 WO 2022220031 A1 WO2022220031 A1 WO 2022220031A1 JP 2022013409 W JP2022013409 W JP 2022013409W WO 2022220031 A1 WO2022220031 A1 WO 2022220031A1
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- H01G4/00—Fixed capacitors; Processes of their manufacture
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- H—ELECTRICITY
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- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
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- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
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- H—ELECTRICITY
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- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
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- H01G4/1209—Ceramic dielectrics characterised by the ceramic dielectric material
- H01G4/1218—Ceramic dielectrics characterised by the ceramic dielectric material based on titanium oxides or titanates
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- H—ELECTRICITY
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- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/002—Details
- H01G4/018—Dielectrics
- H01G4/06—Solid dielectrics
- H01G4/08—Inorganic dielectrics
- H01G4/12—Ceramic dielectrics
- H01G4/1209—Ceramic dielectrics characterised by the ceramic dielectric material
- H01G4/1218—Ceramic dielectrics characterised by the ceramic dielectric material based on titanium oxides or titanates
- H01G4/1227—Ceramic dielectrics characterised by the ceramic dielectric material based on titanium oxides or titanates based on alkaline earth titanates
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
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- H—ELECTRICITY
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- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
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- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/30—Stacked capacitors
Definitions
- the present invention relates to a multilayer ceramic capacitor.
- Multilayer capacitors are known in which the ESL (equivalent series inductance) is reduced by widening the current flow route, shortening the current flow route, and canceling out the magnetic fields generated by currents of different polarities.
- Patent Document 1 discloses an example of a multilayer capacitor with a reduced ESL.
- the multilayer capacitor disclosed in Patent Document 1 includes a capacitor body in which a plurality of dielectric layers, a plurality of first internal electrodes, and a plurality of second internal electrodes are laminated.
- the capacitor body is electrically connected to the plurality of first internal electrodes and electrically connected to the plurality of first via conductors extending to one main surface of the capacitor body and the plurality of second internal electrodes. and a plurality of second via conductors connected to and extending to one main surface of the capacitor body.
- a plurality of first external electrodes electrically connected to the plurality of first via conductors and a plurality of electrodes electrically connected to the plurality of second via conductors are formed on one main surface of the capacitor body. and second external electrodes are formed.
- the first external electrode is formed at a position where the first via conductor is exposed on one main surface of the capacitor body, and the second via conductor is formed on the capacitor body. Since the second external electrode is formed at a position exposed on one of the main surfaces, the first external electrode and the second external electrode are formed at arbitrary positions on the main surface, respectively. I had a problem that I could't.
- An object of the present invention is to solve the above problems, and to provide a multilayer ceramic capacitor capable of forming a first external electrode and a second external electrode at arbitrary positions.
- the multilayer ceramic capacitor of the present invention is a capacitor body in which a plurality of dielectric layers, a plurality of first internal electrodes, and a plurality of second internal electrodes are laminated; a first via conductor provided inside the capacitor body and electrically connected to the plurality of first internal electrodes; a second via conductor provided inside the capacitor body and electrically connected to the plurality of second internal electrodes; A first via conductor electrically connected to the first via conductor and extending to a position different from a position connected to the first via conductor on the outer surface of the capacitor body. an extraction electrode section; A second via conductor electrically connected to the second via conductor and extending to a position different from a position connected to the second via conductor on the outer surface of the capacitor body.
- an extraction electrode section a first external electrode electrically connected to the first extraction electrode portion; a second external electrode electrically connected to the second extraction electrode portion; an insulating resin that insulates between the first lead-out electrode portion and the second lead-out electrode portion and between the first external electrode and the second external electrode; characterized by comprising
- the first external electrode is provided on the outer surface of the capacitor body so as to extend to a position different from the position where it is connected to the first via conductor.
- the second external electrode is electrically connected to the lead-out electrode portion and is provided in such a manner that the second external electrode extends to a position different from the position where it is connected to the second via conductor on the outer surface of the capacitor body. It is electrically connected to the extraction electrode section. Therefore, the first external electrode can be provided at a position different from the position where the first via conductor is exposed on the outer surface of the capacitor body, and the second via conductor is exposed on the outer surface of the capacitor body. It becomes possible to provide the second external electrode at a position different from the position where the second external electrode is provided.
- FIG. 1 is a plan view of a laminated ceramic capacitor in one embodiment of the present invention
- FIG. 2 is a cross-sectional view of the multilayer ceramic capacitor shown in FIG. 1 taken along line II-II.
- FIG. 3 is an enlarged sectional view of a part of the multilayer ceramic capacitor shown in FIG. 2
- FIG. 10 is a diagram showing an example of wiring patterns of the first lead-out electrode portion and the second lead-out electrode portion when the number of external electrodes is 36
- FIG. 10 is a diagram showing another example of wiring patterns of the first lead-out electrode portion and the second lead-out electrode portion when the number of external electrodes is 36
- FIG. 10 is a diagram showing an example of wiring patterns of a first lead-out electrode portion and a second lead-out electrode portion when the number of external electrodes is 100;
- FIG. 10 is a diagram showing another example of wiring patterns of the first lead-out electrode portion and the second lead-out electrode portion when the number of external electrodes is 100;
- FIG. 10 is a diagram showing still another example of wiring patterns of the first lead-out electrode portion and the second lead-out electrode portion when the number of external electrodes is 100;
- FIG. 1 is a diagram for explaining that a multilayer ceramic capacitor in one embodiment can suppress a decrease in capacitance even when the number of external electrodes is increased, and FIG.
- FIG. 2B is a cross-sectional view schematically showing the structure of FIG. 1B
- FIG. BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing which shows typically the structure of a laminated ceramic capacitor, (c) is sectional drawing which shows typically the structure of the laminated ceramic capacitor in one Embodiment. It is a figure for demonstrating the manufacturing method of the laminated ceramic capacitor in one Embodiment.
- FIG. 1 is a plan view of a multilayer ceramic capacitor 100 according to one embodiment of the present invention.
- FIG. 2 is a cross-sectional view of the multilayer ceramic capacitor 100 shown in FIG. 1 along line II-II.
- FIG. 3 is a partially enlarged sectional view of the multilayer ceramic capacitor 100 shown in FIG.
- the multilayer ceramic capacitor 100 includes a capacitor body 1, a first via conductor 5, a second via conductor 6, a first extraction electrode portion 11, a second extraction electrode portion 12, and a first external electrode. 21 , a second external electrode 22 and an insulating resin 30 .
- the capacitor body 1 has a structure in which a plurality of dielectric layers 2, a plurality of first internal electrodes 3, and a plurality of second internal electrodes 4 are laminated. More specifically, capacitor body 1 has a structure in which a plurality of first internal electrodes 3 and second internal electrodes 4 are alternately laminated with dielectric layers 2 interposed therebetween.
- the material of the dielectric layer 2 is arbitrary, and is made of, for example, a ceramic material containing BaTiO 3 , CaTiO 3 , SrTiO 3 , SrZrO 3 , or CaZrO 3 as a main component.
- These main components may contain subcomponents such as Mn compounds, Fe compounds, Cr compounds, Co compounds, and Ni compounds whose content is less than that of the main components.
- the shape of the capacitor body 1 is arbitrary, and can be, for example, a rectangular parallelepiped shape as a whole.
- the shape of a rectangular parallelepiped as a whole is not a perfect rectangular parallelepiped shape, for example, a rectangular parallelepiped with rounded corners and ridges, or a rectangular parallelepiped with unevenness on its surface, but with six A shape that has an outer surface and can be regarded as a rectangular parallelepiped as a whole.
- the dimensions of the capacitor body 1 are also arbitrary.
- the dimensions of the internal electrodes 3 and the second internal electrodes 4 in the stacking direction T (hereinafter simply referred to as the stacking direction T) can be set to 50 ⁇ m or more and 200 ⁇ m or less.
- the material of the first internal electrode 3 and the second internal electrode 4 is arbitrary. It contains alloys containing The first internal electrode 3 and the second internal electrode 4 may contain the same ceramic material as the dielectric ceramic contained in the dielectric layer 2 as a common material. In that case, the ratio of the common material contained in the first internal electrode 3 and the second internal electrode 4 is, for example, 20 vol % or less.
- the thickness of the first internal electrode 3 and the second internal electrode 4 is arbitrary, but can be, for example, about 0.3 ⁇ m or more and 1.0 ⁇ m or less. Although the number of layers of the first internal electrode 3 and the second internal electrode 4 is arbitrary, the total number of both can be, for example, approximately 10 layers or more and 150 layers or less. Note that capacitor body 1 may include internal electrodes that are not electrically connected to first external electrode 21 and second external electrode 22 .
- a plurality of first through holes 3a are formed in the first internal electrode 3 for inserting second via conductors 6, which will be described later.
- a plurality of second through holes 4a are formed in the second internal electrode 4 for inserting the first via conductors 5, which will be described later.
- capacitance is formed by the first internal electrode 3 and the second internal electrode 4 facing each other with the dielectric layer 2 interposed therebetween.
- the first via conductors 5 are provided inside the capacitor body 1 so as to extend in the stacking direction T, and are electrically connected to the plurality of first internal electrodes 3 .
- the first via conductors 5 are inserted through the second through holes 4 a formed in the second internal electrodes 4 and are insulated from the second internal electrodes 4 .
- the second via conductors 6 are provided inside the capacitor body 1 so as to extend in the stacking direction T, and are electrically connected to the plurality of second internal electrodes 4 .
- the second via conductors 6 are inserted through the first through holes 3 a formed in the first internal electrodes 3 and are insulated from the first internal electrodes 3 .
- the plurality of first via conductors 5 and the plurality of second via conductors 6 can be provided at arbitrary positions inside the capacitor body 1 .
- a plurality of first via conductors 5 and a plurality of second via conductors 6 are provided in a matrix.
- first via conductors 5 and the second via conductors 6 are exposed on the first outer surface 1 a of the six outer surfaces of the capacitor body 1 .
- First outer surface 1a is one of two main surfaces facing in lamination direction T among six outer surfaces of capacitor body 1 .
- any material can be used for the first via conductor 5 and the second via conductor 6.
- metals such as Ni, Cu, Ag, Pd, Pt, Fe, Ti, Cr, Sn and Au, or those metals are It contains alloys containing
- first via conductor 5 and the second via conductor 6 can be cylindrical, for example.
- the diameters of the first via conductor 5 and the second via conductor 6 can be, for example, about 30 ⁇ m or more and 150 ⁇ m or less.
- the distance between adjacent first via conductors 5 and second via conductors 6, more specifically, distance L1 between the center of first via conductor 5 and the center of second via conductor 6 can be, for example, about 50 ⁇ m or more and 500 ⁇ m or less.
- the first extraction electrode portion 11 is electrically connected to the first via conductor 5 and extends to a position different from the position connected to the first via conductor 5 on the outer surface of the capacitor body 1 . It is provided in a manner to In this embodiment, the first extraction electrode portion 11 is provided on the first outer surface 1a of the capacitor body 1, and is directly connected to the first via conductor 5 exposed on the first outer surface 1a. It is connected.
- the second extraction electrode portion 12 is electrically connected to the second via conductor 6 and extends to a position different from the position connected to the second via conductor 6 on the outer surface of the capacitor body 1 . It is provided in a manner to In this embodiment, the second extraction electrode portion 12 is provided on the first outer surface 1a of the capacitor body 1, and is directly connected to the second via conductor 6 exposed on the first outer surface 1a. It is connected
- first lead electrode portion 11 and the second lead electrode portion 12 can be any material used for the first lead electrode portion 11 and the second lead electrode portion 12, and for example, Cu can be used. However, instead of Cu, metals such as Ni, Ag, Pd, Pt, Fe, Ti, Cr, Sn or Au, or alloys containing these metals may be used.
- the first lead-out electrode portion 11 and the second lead-out electrode portion 12 can be formed as thin film layers, and the thickness thereof can be, for example, about 50 nm or more and 3 ⁇ m or less.
- the first external electrode 21 is provided outside the capacitor body 1 and electrically connected to the first extraction electrode portion 11 . Since the first extraction electrode portion 11 is electrically connected to the first via conductor 5 and the first via conductor 5 is electrically connected to the plurality of first internal electrodes 3, the first The external electrodes 21 are electrically connected to the plurality of first internal electrodes 3 .
- the second external electrode 22 is provided outside the capacitor body 1 and electrically connected to the second lead electrode portion 12 .
- the second lead-out electrode portion 12 is electrically connected to the second via conductor 6
- the second via conductor 6 is electrically connected to the plurality of second internal electrodes 4 .
- the external electrodes 22 are electrically connected to the plurality of second internal electrodes 4 .
- the first lead-out electrode portion 11 and the second lead-out electrode portion 12 are provided on the first outer surface 1a of the capacitor body 1, respectively, and the first outer electrode 21 and the second outer electrode 21 are provided.
- the electrode 22 is also provided on the first outer surface 1a side of the capacitor body 1 .
- a plurality of first external electrodes 21 and a plurality of second external electrodes 22 are provided in a matrix.
- the number and arrangement of the first external electrodes 21 and the second external electrodes 22 are arbitrary, and are not limited to the number and arrangement shown in FIG.
- the number of the first external electrodes 21 and the number of the second external electrodes 22 are preferably the same, they may be different.
- any material can be used for the first external electrode 21 and the second external electrode 22, and for example, Cu can be used.
- metals such as Ni, Ag, Pd, Pt, Fe, Ti, Cr, Sn or Au, or alloys containing these metals may be used.
- the surfaces of the first external electrode 21 and the second external electrode 22 may be plated. Plating can be performed using metals such as Cu, Ni, Ag, Pd, Pt, Fe, Ti, Cr, Sn or Au, or alloys containing these metals. Plating may be a single layer or multiple layers.
- the insulating resin 30 is provided on the outside of the capacitor main body 1, between the first lead electrode portion 11 and the second lead electrode portion 12, and between the first external electrode 21 and the second external electrode 22. insulate between In this embodiment, the insulating resin 30 is provided so as to cover the first lead electrode portion 11 and the second lead electrode portion 12 provided on the first outer surface 1 a of the capacitor body 1 . More specifically, the insulating resin 30 covers the entire first outer surface 1a of the outer surface of the capacitor body 1 on which the first lead-out electrode portion 11 and the second lead-out electrode portion 12 are provided. is provided in a manner to cover the
- the insulating resin 30 is made of polyimide resin, for example. However, the insulating resin 30 is not limited to the polyimide resin, and other insulating resins having photosensitivity may be used.
- the thickness of the insulating resin 30 can be, for example, about 1 ⁇ m or more and 10 ⁇ m or less.
- the first external electrode 21 described above is provided on the insulating resin 30 and is connected to the first extraction electrode section 11 through the insulating resin 30 .
- the second external electrode 22 is provided on the insulating resin 30 and is connected to the second extraction electrode section 12 through the insulating resin 30 . Note that “above the insulating resin 30 ” means above the insulating resin 30 when the side where the capacitor body 1 is positioned is taken as the bottom.
- the shape of the first external electrode 21 and the second external electrode 22 when viewed from the direction perpendicular to the first outer surface 1a of the capacitor body 1 is arbitrary, and for example, as shown in FIG. can do.
- the diameter R1 (see FIG. 3) of the first external electrode 21 and the second external electrode 22 can be, for example, about 10 ⁇ m or more and 150 ⁇ m or less.
- the shape of the portion of the first external electrode 21 and the second external electrode 22 penetrating through the insulating resin 30 is also arbitrary, and can be, for example, a cylindrical shape.
- the diameter R2 (see FIG. 3) is, for example, about 5 ⁇ m or more and 100 ⁇ m or less. can be
- the number of first external electrodes 21 is greater than the number of first via conductors 5, and the number of second external electrodes 22 is greater than the number of second via conductors 6. more than That is, at least one of the plurality of first via conductors 5 is electrically connected to the plurality of first external electrodes 21 . At least one second via conductor 6 among the plurality of second via conductors 6 is electrically connected to the plurality of second external electrodes 22 . With such a configuration, the number of first external electrodes 21 and second external electrodes 22 can be increased without increasing the number of first via conductors 5 and second via conductors 6 . In this embodiment, each of the plurality of first via conductors 5 is electrically connected to the plurality of first external electrodes 21, and each of the plurality of second via conductors 6 is connected to the plurality of second external electrodes 22. is electrically connected to
- the number of first external electrodes 21 is at least four times the number of first via conductors 5, and the number of second external electrodes 22 is at least four times the number of second via conductors 6. is preferred. With such a configuration, more first external electrodes 21 and second external electrodes 22 can be arranged without increasing the number of first via conductors 5 and second via conductors 6. .
- a current flow route is composed of a large number of first via conductors 5 connected in parallel and a large number of second via conductors 6 connected in parallel. , and the shortest length, the ESL is low.
- the multilayer ceramic capacitor 100 is configured such that the magnetic field generated by the current flowing through the first via conductor 5 and the magnetic field generated by the current flowing through the second via conductor 6 cancel each other, the magnetic field is low. It is ESL.
- FIG. 4 is a diagram showing an example of wiring patterns of the first lead electrode portion 11 and the second lead electrode portion 12.
- FIG. 4 18 first external electrodes 21 and 18 second external electrodes 22 are also shown.
- the first lead electrode portion 11 and the second lead electrode portion 12 are each provided as a wiring pattern extending linearly.
- the first lead-out electrode portion 11 as a wiring pattern extending linearly, it can be formed into an arbitrary shape, so that it becomes easy to dispose the first external electrode 21 at an arbitrary position.
- the second lead-out electrode portion 12 as a wiring pattern extending linearly, it is possible to make it into an arbitrary shape, so that it becomes easy to dispose the second external electrode 22 at an arbitrary position.
- the widths of the first lead-out electrode portion 11 and the second lead-out electrode portion 12 extending linearly can be, for example, about 5 ⁇ m or more and 100 ⁇ m or less.
- first extraction electrode portions 11 and four second extraction electrode portions 12 are provided.
- five first via conductors 5 are provided, which is the same number as the first lead-out electrode portions 11
- second via conductors 6 are provided in the same number as the second lead-out electrode portions 12 .
- one first extraction electrode portion 11 is electrically connected to three or four first external electrodes 21, and one second extraction electrode portion 12 is electrically connected to four Alternatively, it is electrically connected to five second external electrodes 22 .
- FIG. 5 is a diagram showing another example of wiring patterns of the first lead electrode portion 11 and the second lead electrode portion 12.
- FIG. FIG. 5 also shows 18 first external electrodes 21 and 18 second external electrodes 22 together.
- three first extraction electrode portions 11 and two second extraction electrode portions 12 are provided.
- one first extraction electrode portion 11 is electrically connected to two or fourteen first external electrodes 21, and one second extraction electrode portion 12 is electrically connected to nine electrodes. is electrically connected to the second external electrode 22 of the .
- the number of first via conductors 5 electrically connected to one first lead-out electrode portion 11 is one
- the number of the second via conductors electrically connected to one second lead-out electrode portion 12 is one.
- the number of via conductors 6 is one
- the number of first via conductors 5 and second via conductors 6 can be reduced by reducing the number of first lead electrode portions 11 and second lead electrode portions 12. can be reduced, thereby increasing the capacitance, as described below.
- the wiring pattern shown in FIG. 5 has fewer first lead-out electrode portions 11 and second lead-out electrode portions 12 than the wiring pattern shown in FIG.
- the number of conductors 5 and second via conductors 6 can be reduced, and the capacitance can be increased.
- FIGS. 6-8. 6 to 8 show the first external electrode 21 and the second external electrode 22 together. Although not shown, 13 first via conductors 5 and 12 second via conductors 6 are provided.
- first lead-out electrode portions 11 and 12 second lead-out electrode portions 12 are provided in the wiring pattern shown in FIG. 6, 13 first lead-out electrode portions 11 and 12 second lead-out electrode portions 12 are provided. As shown in FIG. 6, one first extraction electrode portion 11 is electrically connected to three or four first external electrodes 21, and one second extraction electrode portion 12 is electrically connected to four Alternatively, it is electrically connected to five second external electrodes 22 .
- first extraction electrode portions 11 and 12 second extraction electrode portions 12 are provided in the wiring pattern shown in FIG. 7, 13 first extraction electrode portions 11 and 12 second extraction electrode portions 12 are provided. As shown in FIG. 7, one first extraction electrode portion 11 is electrically connected to three or four first external electrodes 21, and one second extraction electrode portion 12 is electrically connected to four Alternatively, it is electrically connected to five second external electrodes 22 .
- first extraction electrode portions 11 and one second extraction electrode portion 12 are provided. As shown in FIG. 8, one first extraction electrode portion 11 is electrically connected to two, ten or twenty-six first external electrodes 21, and one second extraction electrode portion 12 is , are electrically connected to the fifty second external electrodes 22 .
- the wiring pattern shown in FIG. 8 has the smallest number of first lead-out electrode portions 11 and second lead-out electrode portions 12. Therefore, the number of first via conductors 5 electrically connected to one first lead-out electrode portion 11 is one, and the number of the second via conductors electrically connected to one second lead-out electrode portion 12 is one.
- the number of via conductors 6 is one, the number of first via conductors 5 and second via conductors 6 can be minimized in the wiring pattern shown in FIG. can be done.
- the wiring patterns of the first lead electrode portion 11 and the second lead electrode portion 12 are not limited to the wiring patterns shown in FIGS.
- the first external electrodes 21 are arranged at arbitrary positions other than the position where the first via conductors 5 are exposed on the outer surface of the capacitor body 1
- Second external electrode 22 can be arranged at any position other than the position where second via conductor 6 is exposed on the outer surface of capacitor body 1 . That is, even if the structure of the capacitor body 1 is uniformly the same, on the outer surface of the capacitor body 1, the first via conductors 5 are formed to extend to the desired position where the first external electrodes 21 are formed.
- the first external electrode 21 and the second external electrode 22 can be formed at desired positions. Therefore, it is possible to provide a multilayer ceramic capacitor 100 having a desired number of first external electrodes 21 and second external electrodes 22 arranged at desired positions according to the specifications of the board on which the multilayer ceramic capacitor 100 is mounted. It becomes possible.
- the multilayer ceramic capacitor 100 of the present embodiment for example, even if it is necessary to increase the number of the first external electrodes 21 and the second external electrodes 22 depending on the specifications of the substrate to be mounted, the multilayer ceramic capacitor A decrease in capacitance of 100 can be suppressed. This will be explained using FIG.
- FIG. 9A a first external electrode 21s is provided at a position where the first via conductor 5s is exposed on the outer surface of the capacitor body 1s, and a second via conductor 6s is exposed on the outer surface of the capacitor body 1s.
- FIG. 10 is a cross-sectional view schematically showing the structure of a conventional laminated ceramic capacitor 100s in which second external electrodes 22s are provided at positions where the second external electrodes 22s are located.
- the capacitor body 1s has a structure in which a plurality of dielectric layers 2s, a plurality of first internal electrodes 3s, and a plurality of second internal electrodes 4s are laminated.
- FIG. 9(b) shows a conventional laminated ceramic capacitor 100t in which the numbers of the first external electrodes 21s and the second external electrodes 22s are each doubled with respect to the laminated ceramic capacitor 100s shown in FIG. 9(a). It is a sectional view showing a structure typically.
- first via conductors 5s and second via conductors 6s are also doubled.
- the capacitance becomes smaller.
- FIG. 9(c) is a cross-sectional view schematically showing the structure of the laminated ceramic capacitor 100 in this embodiment.
- the numbers of the first external electrodes 21 and the second external electrodes 22 are Although doubled, the number of first via conductors 5 and second via conductors 6 can be the same. Therefore, even when the numbers of the first external electrodes 21 and the second external electrodes 22 are increased, the decrease in capacitance can be suppressed.
- the insulating resin is applied to cover the entire surface of the outer surface of the capacitor body 1 on which the first lead-out electrode portion 11 and the second lead-out electrode portion 12 are provided. Since 30 is provided, it is possible to suppress cracking when an external force is applied. That is, since the insulating resin 30 has a lower Young's modulus than the ceramic forming the capacitor main body 1, the insulating resin 30 provided on the outside of the capacitor main body 1 is elastically deformed when an external force is applied to the laminated ceramic capacitor 100. cracking can be suppressed.
- a known ceramic green sheet can be used. For example, it can be obtained by coating a substrate with a ceramic slurry containing ceramic powder, a resin component, and a solvent and drying the slurry. .
- the conductive paste for internal electrodes contains particles made of a metal such as Ni, Cu, Ag, Pd, Pt, Fe, Ti, Cr, Sn or Au or a precursor thereof, and a solvent.
- the conductive paste for internal electrodes may further contain a resin component that serves as a dispersant and a binder.
- an internal electrode pattern is formed by printing a conductive paste for internal electrodes on the ceramic green sheets.
- a predetermined number of ceramic green sheets on which internal electrode patterns are not formed are stacked, and ceramic green sheets on which internal electrode patterns are formed are successively stacked thereon, and internal electrode patterns are formed thereon.
- a predetermined number of ceramic green sheets are laminated to produce a mother laminate.
- a mother laminate is a laminate for manufacturing a plurality of laminated ceramic capacitors 100 at once. The produced mother laminate is pressed by a method such as rigid press or hydrostatic press.
- through holes for forming the first via conductors 5 and through holes for forming the second via conductors 6 are formed in the mother laminate.
- the through holes are formed by, for example, irradiating with a laser beam.
- the conductive paste contains particles of a metal such as Ni, Cu, Ag, Pd, Pt, Fe, Ti, Cr, Sn or Au or a precursor thereof, and a solvent.
- the conductive paste may further contain a resin component that serves as a dispersant and a binder.
- the mother laminate is cut into a predetermined size by a cutting method such as dicing, laser, or the like, to obtain a laminated chip.
- the capacitor body 1 is obtained by firing the obtained laminated chip with a predetermined profile.
- first lead electrode portion 11 and a second lead electrode portion 12 are formed on the first outer surface 1a of the capacitor body 1 (FIG. 10(a)).
- the first extraction electrode portion 11 and the second extraction electrode portion 12 can be formed by sputtering, for example. Specifically, an electrode film for forming the first lead electrode portion 11 and the second lead electrode portion 12 is formed on the first outer surface 1a of the capacitor body 1 by sputtering, followed by ashing and film resist. formation, exposure, development, etching, and resist stripping, the first lead electrode portion 11 electrically connected to the first via conductor 5 and the second via conductor A second extraction electrode portion 12 electrically connected to 6 is formed.
- Cu is used for the first lead electrode portion 11 and the second lead electrode portion 12, for example, sputtering using Ti is performed to form an adhesion layer, and then sputtering using Cu is performed. good too.
- the insulating resin 30 is arranged so as to cover the first lead-out electrode portion 11 and the second lead-out electrode portion 12, and the first external electrode 21 and the second external electrode 22 are formed in the insulating resin 30.
- a hole 31 for forming is provided (FIG. 10(b)).
- the hole 31 for forming the first external electrode 21 is provided at a position at least partially overlapping the first extraction electrode portion 11 when viewed from the direction orthogonal to the first external surface 1a of the capacitor body 1,
- a hole 31 for forming the second external electrode 22 is provided at a position where at least a portion thereof overlaps with the second extraction electrode portion 12 .
- the insulating resin 30 After applying the insulating resin 30 so as to cover the first lead-out electrode portion 11 and the second lead-out electrode portion 12, exposure, development, and curing for hardening the resin are performed.
- the insulating resin 30 provided with the holes 31 is arranged through the steps.
- the first external electrode 21 and the second external electrode 22 are formed (FIG. 10(c)).
- the first external electrode 21 and the second external electrode 22 can be formed by sputtering, for example. Specifically, an electrode film for forming the first external electrode 21 and the second external electrode 22 is formed on the insulating resin 30 by sputtering. formation, exposure, development, etching, and resist stripping, the first external electrode 21 and the second external electrode 22 are formed.
- sputtering using Ti may be performed to form an adhesion layer, and then sputtering using Cu may be performed. .
- the first lead-out electrode portion 11 and the second lead-out electrode portion 12 are provided on the outer surface of the capacitor body 1 .
- a layer may be provided, and the first extraction electrode section 11 and the second extraction electrode section 12 may be provided on the resin layer.
- capacitor body 1a first outer surface of capacitor body 2 dielectric layer 3 first internal electrode 3a first through hole 4 second internal electrode 4a second through hole 5 first via conductor 6 second through hole Via conductor 11
- First extraction electrode portion 12 Second extraction electrode portion 21
- First external electrode 22 Second external electrode 30
- Insulating resin 31 Hole 100 Multilayer ceramic capacitor
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Abstract
Description
複数の誘電体層と、複数の第1の内部電極と、複数の第2の内部電極とが積層されたコンデンサ本体と、
前記コンデンサ本体の内部に設けられ、複数の前記第1の内部電極と電気的に接続された第1のビア導体と、
前記コンデンサ本体の内部に設けられ、複数の前記第2の内部電極と電気的に接続された第2のビア導体と、
前記第1のビア導体と電気的に接続されており、前記コンデンサ本体の外表面において、前記第1のビア導体と接続される位置とは別の位置に延伸する態様で設けられた第1の引き出し電極部と、
前記第2のビア導体と電気的に接続されており、前記コンデンサ本体の外表面において、前記第2のビア導体と接続される位置とは別の位置に延伸する態様で設けられた第2の引き出し電極部と、
前記第1の引き出し電極部と電気的に接続された第1の外部電極と、
前記第2の引き出し電極部と電気的に接続された第2の外部電極と、
前記第1の引き出し電極部と前記第2の引き出し電極部との間、および、前記第1の外部電極と前記第2の外部電極との間を絶縁する絶縁樹脂と、
を備えることを特徴とする。
上述した積層セラミックコンデンサ100の製造方法の一例について説明する。
1a コンデンサ本体の第1の外表面
2 誘電体層
3 第1の内部電極
3a 第1の貫通孔
4 第2の内部電極
4a 第2の貫通孔
5 第1のビア導体
6 第2のビア導体
11 第1の引き出し電極部
12 第2の引き出し電極部
21 第1の外部電極
22 第2の外部電極
30 絶縁樹脂
31 孔
100 積層セラミックコンデンサ
Claims (8)
- 複数の誘電体層と、複数の第1の内部電極と、複数の第2の内部電極とが積層されたコンデンサ本体と、
前記コンデンサ本体の内部に設けられ、複数の前記第1の内部電極と電気的に接続された第1のビア導体と、
前記コンデンサ本体の内部に設けられ、複数の前記第2の内部電極と電気的に接続された第2のビア導体と、
前記第1のビア導体と電気的に接続されており、前記コンデンサ本体の外表面において、前記第1のビア導体と接続される位置とは別の位置に延伸する態様で設けられた第1の引き出し電極部と、
前記第2のビア導体と電気的に接続されており、前記コンデンサ本体の外表面において、前記第2のビア導体と接続される位置とは別の位置に延伸する態様で設けられた第2の引き出し電極部と、
前記第1の引き出し電極部と電気的に接続された第1の外部電極と、
前記第2の引き出し電極部と電気的に接続された第2の外部電極と、
前記第1の引き出し電極部と前記第2の引き出し電極部との間、および、前記第1の外部電極と前記第2の外部電極との間を絶縁する絶縁樹脂と、
を備えることを特徴とする積層セラミックコンデンサ。 - 前記絶縁樹脂は、前記第1の引き出し電極部および前記第2の引き出し電極部を覆って設けられており、
前記第1の外部電極は、前記絶縁樹脂の上に設けられ、かつ、前記絶縁樹脂を貫通して前記第1の引き出し電極部と接続されており、
前記第2の外部電極は、前記絶縁樹脂の上に設けられ、かつ、前記絶縁樹脂を貫通して前記第2の引き出し電極部と接続されていることを特徴とする請求項1に記載の積層セラミックコンデンサ。 - 前記絶縁樹脂は、前記コンデンサ本体の外表面のうち、前記第1の引き出し電極部および前記第2の引き出し電極部が設けられている面の全体を覆う態様で設けられていることを特徴とする請求項1または2に記載の積層セラミックコンデンサ。
- 前記第1の引き出し電極部および前記第2の引き出し電極部はそれぞれ、線状に伸びる配線パターンとして設けられていることを特徴とする請求項1~3のいずれか一項に記載の積層セラミックコンデンサ。
- 前記第1の外部電極の数は、前記第1のビア導体の数よりも多く、
前記第2の外部電極の数は、前記第2のビア導体の数よりも多いことを特徴とする請求項1~4のいずれか一項に記載の積層セラミックコンデンサ。 - 1つの前記第1の引き出し電極部は、複数の前記第1の外部電極と電気的に接続されており、
1つの前記第2の引き出し電極部は、複数の前記第2の外部電極と電気的に接続されていることを特徴とする請求項1~5のいずれか一項に記載の積層セラミックコンデンサ。 - 前記第1の外部電極の数は、前記第1のビア導体の数の4倍以上であり、
前記第2の外部電極の数は、前記第2のビア導体の数の4倍以上であることを特徴とする請求項1~6のいずれか一項に記載の積層セラミックコンデンサ。 - 前記絶縁樹脂は、ポリイミド樹脂であることを特徴とする請求項1~7のいずれか一項に記載の積層セラミックコンデンサ。
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