WO2012002083A1 - コンデンサ及びその製造方法 - Google Patents
コンデンサ及びその製造方法 Download PDFInfo
- Publication number
- WO2012002083A1 WO2012002083A1 PCT/JP2011/062048 JP2011062048W WO2012002083A1 WO 2012002083 A1 WO2012002083 A1 WO 2012002083A1 JP 2011062048 W JP2011062048 W JP 2011062048W WO 2012002083 A1 WO2012002083 A1 WO 2012002083A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- capacitor
- electrode
- electrodes
- external
- dielectric layer
- Prior art date
Links
- 239000003990 capacitor Substances 0.000 title claims abstract description 134
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 27
- 229910052751 metal Inorganic materials 0.000 claims abstract description 20
- 239000002184 metal Substances 0.000 claims abstract description 20
- 238000007743 anodising Methods 0.000 claims description 28
- 239000000463 material Substances 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 19
- 239000004020 conductor Substances 0.000 claims description 17
- 239000000758 substrate Substances 0.000 claims description 9
- 230000015556 catabolic process Effects 0.000 abstract description 23
- 230000003647 oxidation Effects 0.000 abstract description 16
- 238000007254 oxidation reaction Methods 0.000 abstract description 16
- 239000010410 layer Substances 0.000 description 46
- 230000000052 comparative effect Effects 0.000 description 26
- 238000000605 extraction Methods 0.000 description 13
- 238000002048 anodisation reaction Methods 0.000 description 10
- 230000008569 process Effects 0.000 description 8
- 239000000919 ceramic Substances 0.000 description 7
- 239000003985 ceramic capacitor Substances 0.000 description 6
- 239000011241 protective layer Substances 0.000 description 6
- 238000004070 electrodeposition Methods 0.000 description 5
- 229910052782 aluminium Inorganic materials 0.000 description 4
- 229910044991 metal oxide Inorganic materials 0.000 description 4
- 150000004706 metal oxides Chemical class 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- 229910052787 antimony Inorganic materials 0.000 description 3
- 229910052735 hafnium Inorganic materials 0.000 description 3
- 150000002739 metals Chemical class 0.000 description 3
- 229910052758 niobium Inorganic materials 0.000 description 3
- 229910052715 tantalum Inorganic materials 0.000 description 3
- 229910052719 titanium Inorganic materials 0.000 description 3
- 229910052721 tungsten Inorganic materials 0.000 description 3
- 229910052725 zinc Inorganic materials 0.000 description 3
- 229910052726 zirconium Inorganic materials 0.000 description 3
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 229910052745 lead Inorganic materials 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 229910052763 palladium Inorganic materials 0.000 description 2
- 229910052697 platinum Inorganic materials 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- 229910000679 solder Inorganic materials 0.000 description 2
- 229910052718 tin Inorganic materials 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- 239000004642 Polyimide Substances 0.000 description 1
- 229910010413 TiO 2 Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000008151 electrolyte solution Substances 0.000 description 1
- 229910052741 iridium Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 229910052703 rhodium Inorganic materials 0.000 description 1
- 229910052707 ruthenium Inorganic materials 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/002—Details
- H01G4/005—Electrodes
- H01G4/01—Form of self-supporting electrodes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/002—Details
- H01G4/005—Electrodes
- H01G4/012—Form of non-self-supporting electrodes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/002—Details
- H01G4/228—Terminals
- H01G4/232—Terminals electrically connecting two or more layers of a stacked or rolled capacitor
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/30—Stacked capacitors
- H01G4/302—Stacked capacitors obtained by injection of metal in cavities formed in a ceramic body
Definitions
- the present invention relates to a capacitor and a manufacturing method thereof, and more specifically, to a capacitor with improved capacity and breakdown voltage resistance and a manufacturing method thereof.
- the ceramic laminate 900 includes an extraction electrode 910 connected to the external electrode 920 and an extraction electrode 912 formed in the same layer as the extraction electrode 910 and connected to the external electrode 920. In other layers, extraction electrodes similar to the extraction electrodes 910 and 912 are formed.
- a floating electrode 930 is formed between the layer on which the extraction electrodes 910 and 912 are formed and the layer located below the layer.
- a unit capacitor unit 940 is formed by the floating electrode 930 and the extraction electrode 910
- a unit capacitor unit 942 is formed by the floating electrode 930 and the extraction electrode 912.
- the unit capacitor unit 940 and the unit capacitor unit 942 are connected in series between the external electrode 920 and the external electrode 922.
- a floating electrode similar to the floating electrode 930 is also formed between the other layers.
- multilayer capacitors formed by a plurality of extraction electrodes and a plurality of floating electrodes are connected in series between the external electrodes.
- the ceramic laminate 900 is said to be able to improve pressure resistance while suppressing the occurrence of surface leakage.
- the ceramic laminated body 900 described in Patent Document 1 there are portions where the number of stacked electrodes is different when viewed in the electrode stacking direction (vertical direction in FIG. 4). For example, in the center of the element, there are only five layers of floating electrodes 930 and no extraction electrodes. In the vicinity of the external electrodes 920 and 922, there are only four layers of extraction electrodes. In regions other than these, there are both four layers of extraction electrodes and five layers of floating electrodes 930. For this reason, the thickness of the ceramic laminated body 900 changes with parts, and, thereby, the distribution of the stress which generate
- Al electrolytic capacitors and multilayer ceramic capacitors are widely used.
- an Al electrolytic capacitor there is a problem of liquid leakage because an electrolytic solution is used.
- firing is required, and there is a problem that heat shrinkage occurs between the electrode and the dielectric in the firing process.
- a capacitor using porous Al 2 O 3 has been proposed as a technique for dealing with these problems (see, for example, Japanese Patent Application Laid-Open No. 2009-88034).
- the present inventors have found that by using such a porous type capacitor, there is a possibility that problems such as the occurrence of cracks in the multilayer type capacitor described above may be improved.
- a capacitor capable of improving the capacitance value without sacrificing the breakdown voltage, a manufacturing method thereof, and the breakdown voltage can be improved without sacrificing the capacitance value. Possible capacitors and methods of manufacturing the same are provided.
- a capacitor according to an embodiment of the present invention has a first main surface and a second main surface formed substantially parallel to each other, and is formed so as to be substantially orthogonal to the first and second main surfaces.
- a dielectric layer having a plurality of holes, a plurality of columnar electrodes formed by filling the plurality of holes with a conductor, and a plurality of columnar electrodes on the first main surface of the dielectric layer.
- a first external electrode formed to be electrically connected to a part of the columnar electrodes, and the second external surface of the dielectric layer are electrically connected to the first external electrode among the plurality of columnar electrodes.
- a second external electrode formed so as to be electrically connected to a non-conductive one, and at least one of the first or second external electrodes is composed of a plurality of conductor units electrically isolated from each other.
- a capacitor manufacturing method includes a step of preparing a valve metal base material having a first main surface and a second main surface formed substantially parallel to each other, and the base material as an anode. Oxidizing and forming a dielectric layer having a plurality of holes substantially orthogonal to the first and second main surfaces; filling the plurality of holes in the dielectric layer with a conductor; Forming a columnar electrode; forming a first external electrode in conduction with a part of the plurality of columnar electrodes on the first main surface; and forming the first main electrode on the second main surface, Forming a second external electrode that is electrically connected to the first external electrode and the non-conductive columnar electrode among a plurality of columnar electrodes, and at least one of the first or second external electrode, They are formed so as to be electrically isolated from each other.
- a capacitor capable of improving a capacitance value while maintaining a necessary breakdown voltage, a manufacturing method thereof, and a dielectric breakdown voltage can be improved while maintaining a necessary capacitance value. Possible capacitors and methods of manufacturing the same are provided.
- FIG. 1 shows a capacitor according to an embodiment of the present invention
- FIG. 1 (A) is a cross-sectional view showing a multilayer structure of the capacitor according to an embodiment of the present invention
- FIG. 1 (B) is FIG. 1 (A).
- FIG. 1C is a schematic view of a section of FIG. 1B cut along the line # A- # A as seen from the direction of the arrow.
- FIG. 2 shows a capacitor according to another embodiment of the present invention.
- 2A is a cross-sectional view showing a multilayer structure of the capacitor
- FIG. 2B is an enlarged perspective view of a part of FIG. 2A
- FIG. FIG. 6 is a schematic view of a cross section cut along a line B- # B as seen from the direction of an arrow.
- FIG. 1 shows a capacitor according to an embodiment of the present invention
- FIG. 1 (A) is a cross-sectional view showing a multilayer structure of the capacitor according to an embodiment of the present invention
- FIG. 3 is a diagram illustrating a capacitor of a comparative example.
- 3A is a cross-sectional view showing a laminated structure of a capacitor of a comparative example
- FIG. 3B is an enlarged perspective view of a part of FIG. 3A
- FIG. 3C is FIG. ) Is a schematic view of a cross section taken along line # C- # C as seen from the direction of the arrow.
- It is sectional drawing which shows an example of background art.
- FIG. 1A is a cross-sectional view showing a multilayer structure of a capacitor according to an embodiment of the present invention
- FIG. 1B is an enlarged perspective view of a part of FIG. 1A
- FIG. FIG. 2 is a schematic diagram showing a cross section of FIG. 1B cut along the line # A- # A as seen from the direction of the arrow.
- a capacitor 10 according to an embodiment of the present invention includes a capacitor element 12 as shown in FIG.
- the capacitor element 12 includes a dielectric layer 14 made of a substantially rectangular parallelepiped or substantially sheet-like porous body in which a large number of holes are formed substantially in parallel by metal anodic oxidation. As shown in FIG.
- the dielectric layer 14 has a large number of cells formed by anodizing a base material such as a valve metal.
- Each cell has a bottomed cylindrical shape, a hole extending in the thickness direction of the base material, a side wall made of an oxide of the base material surrounding the hole, and a bottom portion made of the oxide of the base material ( Also called a barrier layer).
- the surface of the base material is selectively dissolved by the action of an acid, and the holes grow in the thickness direction of the base material by the action of an applied voltage.
- the oxide film according to an applied voltage is formed in a bottom part. In this way, a plurality of cells made of valve metal oxide and having a bottomed cylindrical shape are formed on the substrate.
- Each cell has a substantially hexagonal shape in plan view, but in FIG. 1C, the shape of each cell in plan view is shown in a substantially circular shape in order to simply illustrate the size and arrangement of the cells.
- a large number of holes formed in the dielectric layer 14 are filled with a conductor, and a large number of columnar electrodes 16 are formed by the conductor.
- the columnar electrodes 16 are randomly assigned to a positive electrode and a negative electrode, as described in Japanese Patent Application Laid-Open No. 2009-88034 described above. The contents described in JP 2009-88034 A are incorporated herein by reference in their entirety.
- the columnar electrode 16 is formed so as to be substantially orthogonal to one main surface 14A of the dielectric layer 14.
- a first external electrode 18 is formed on the main surface 14A.
- the first external electrode 18 is electrically connected to some of the many columnar electrodes 16.
- the columnar electrode 16 that is electrically connected to the first external electrode 18 functions as a negative electrode.
- Second external electrodes 20A and 20B are formed on the other main surface 14B of the dielectric layer 14.
- the second external electrodes 20 ⁇ / b> A and 20 ⁇ / b> B are electrically connected to the non-conducting one of the columnar electrodes 16 with the first external electrode 18.
- the columnar electrode 16 that is electrically connected to the second external electrodes 20A and 20B functions as a positive electrode.
- the columnar electrode 16 and the second external electrodes 20A, 20B are insulated by an insulating cap 24, and the remaining columnar electrode 16 (for example, one that functions as a positive electrode).
- the first external electrode 18 is insulated by an insulating cap 22.
- the second external electrodes 20A and 20B are formed on the dielectric layer main surface 14B so as to be electrically isolated from each other. As a result, the capacitor 10 has a capacitance generating portion 2 in an equivalent circuit manner.
- the structure is connected in series to the stage.
- the second external electrodes 20A and 20B are connected to the external terminals 26 and 28, respectively.
- the first external electrode 18 is covered with a protective layer 30, and the second external electrodes 20A and 20B are covered with a protective layer 32 except for portions where the external terminals 26 and 28 are provided.
- an oxide of valve metal Al, Ta, Nb, Ti, Zr, Hf, Zn, W, Sb, etc.
- the external electrodes 18, 20A, 20B and the external terminals 26, 28 are made of, for example, metals such as Cu, Ni, Cr, Ag, Au, Pd, Fe, Sn, Pb, Pt, Ir, Rh, Ru, Al, solder, And / or a laminate of these metals and solder.
- a metal that can be plated such as Cu, Ni, Co, Cr, Ag, Au, Pd, Fe, Sn, Pb, and Pt, and / or an alloy thereof is used.
- the insulating caps 22 and 24 are, for example, valve metal oxides such as Al, Ta, Nb, Ti, Zr, Hf, Zn, W, and Sb, air gaps, electrodeposition resins such as polyimide, epoxy, and acrylic, and electrodeposition. It consists of TiO 2 or electrodeposited SiO 2 .
- the protective layers 30 and 32 are made of, for example, SiO 2 , SiN, resin, or metal oxide.
- the distance between the first external electrode 18 and the second external electrodes 20A, 20B is, for example, several hundred nm to several hundred ⁇ m, and the first external electrode 18 and the second external electrode 20A. 20B is, for example, several tens of nm to several ⁇ m.
- the columnar electrodes 16 are formed so that the diameter thereof is, for example, several tens nm to several hundreds nm, the length thereof is, for example, several hundreds nm to several hundreds of ⁇ m, and the interval between adjacent columnar electrodes 16 is, for example, about several tens nm to several hundreds nm.
- the insulating caps 22 and 24 are formed to have a thickness of, for example, several tens of nanometers to several tens of micrometers, and the protective layers 30 and 32 are formed to have a thickness of, for example, several tens of nanometers to several tens of micrometers.
- a base material 50 made of a valve metal such as Al, Ta, Nb, Ti, Zr, Hf, Zn, W, Sb is prepared.
- the first hole 52 having a desired depth (length) is formed into the metal substrate.
- a plurality are formed in the thickness direction of 50.
- a part of the first hole 52 is formed by subjecting the equipment 50 to an anodic oxidation treatment using a larger applied voltage than when the first hole 52 is formed.
- a second hole 56 is formed on the bottom surface of the substrate, and the base material 50 is oxidized except for a part of the region near the bottom surface. Since the pitch of holes (interval between holes) generated by anodization is proportional to the voltage, the second hole 56 is formed not in all of the first holes 52 but in a part thereof.
- the dielectric layer 14 is composed of an oxide of the valve metal obtained by the first stage and second stage anodization.
- the first-stage anodizing treatment shown in FIG. 5B is performed under the conditions that, in one embodiment, the applied voltage is several volts to several hundred volts and the treatment time is several minutes to several days.
- the second stage anodizing treatment shown in FIG. 5C is performed under the condition that the voltage value is several times that of the first stage and the treatment time is several minutes to several tens of minutes. For example, if the applied voltage at the first stage is 20 V, the pitch of the first holes 52 is about 50 nm, and if the applied voltage at the second stage is 40 V, the pitch of the second holes 56 is 100 nm.
- the number of the first holes 52 in which the second holes 56 are formed and the number of the first holes 52 in which the second holes 56 are not formed are approximately. It can be the same number. Further, since the processing time for the second stage anodization is about several minutes to several tens of minutes, the thickness of the oxide base 54 formed in the second stage can be reduced. Since the oxide base 54 formed in the second stage is removed in a later process described later, it is desirable that the oxide base 54 be as thin as possible.
- the metal base portion 50 (the portion that has not been oxidized by the anodizing process) of the metal base material 50 is removed, and then the oxide base material 54 (dielectric layer 14) is removed.
- the second hole 56 is opened from one main surface 14A of the dielectric layer 14, as shown in FIG.
- a seed layer 58 made of a conductor is formed on the other main surface 14B of the dielectric layer 14 by the PVD method or the like.
- a plated conductor is embedded inside the first hole 52 connected to the second hole 56 using the seed layer 58 as a seed to form the columnar electrode 16.
- the plated conductor is not embedded in the hole.
- the plated conductor is embedded so that the end 16A of the columnar electrode 16 does not reach the second hole 56.
- this gap is used as the insulating cap 22.
- anodization, oxide electrodeposition, resin electrodeposition, etc. By this method, an insulating cap made of a material other than air may be formed.
- the seed layer 58 is removed, and the dielectric layer 14 is cut off at the position of the dotted line (near the upper end of the second hole 56). As shown, the end of the first hole 52 where the columnar electrode 16 is not formed is opened.
- the first external electrode 18 is formed on the dielectric layer main surface 14A by the PVD method or the like. Then, as shown in FIG. 6E, with the first external electrode 18 as a seed, a plated conductor is embedded inside the first hole 52 where the columnar electrode 16 is not formed, and the remaining columnar electrode 16 is formed.
- the plating conductor is embedded so that the end portion 16B of the columnar electrode does not reach the dielectric main surface 14B, whereby the end portion 16B of the columnar electrode 16 and the opening end portion of the first hole 52 are formed.
- a gap is formed between the two.
- This gap air gap
- an insulation made of a material other than air is formed between the end 16B of the columnar electrode 16 and the open end of the first hole 52 by a method such as anodization, an oxide electrode, or resin electrodeposition.
- a cap may be formed.
- the capacitor element 12 is obtained in which the other columnar electrode 16 is electrically connected to the second external electrode 20A.
- the second external electrode 20B electrically isolated from the second external electrode 20A is formed on the dielectric main surface 14B. It is formed.
- the external terminals 26 and 28 shown in FIG. 1A are formed on the second external electrodes 20A and 20B, respectively, and portions other than the external terminals 26 and 28 of the capacitor element 12 are covered with protective layers 30 and 32.
- the capacitor 10 in which the capacitance generating units are connected in two stages in series is obtained.
- the porous dielectric layer 14 made of porous Al 2 O 3 is obtained by anodizing Al.
- the porous dielectric layer 14 includes a large number of cells having a substantially hexagonal shape in cross section (in FIG. 1C, circular cells are indicated by dotted lines for convenience of illustration).
- the size of this cell is known to be proportional to the anodization voltage, and its diameter is about 2.5 nm / V. That is, when the voltage used for the anodizing treatment is 1 V, the cell diameter is about 2.5 nm.
- the dielectric thickness T1 (distance between the surfaces of the adjacent columnar electrodes 16) of the capacitor generating portion in the capacitor structure is approximately 2/3 of the cell size D1. Become. For example, when anodizing at 20 V is performed, the cell size D1 is about 50 nm and the dielectric thickness T1 is about 33 nm.
- 3A is a cross-sectional view showing a laminated structure of the capacitor 100 of the comparative example
- FIG. 3B is an enlarged perspective view of a part of FIG. 3A
- FIG. 3C is FIG.
- FIG. 5B is a schematic cross-sectional view taken along line # C- # C and viewed from the direction of the arrow.
- the capacitor 100 has the same structure as the capacitor 10 except that the second external electrode 20 is made of a single conductor and the external electrode 28 is connected to the first external electrode 18.
- the capacitor 10 is formed by the same process. In the manufacturing process of the capacitor 100, for example, the first stage anodizing voltage is set to 40V.
- the cell size D3 is 100 nm and the dielectric thickness T3 is about 66 nm.
- the second stage anodizing treatment is performed using a voltage higher than the voltage used in the first stage anodizing treatment.
- the first external electrode 18 is connected to a connection land 104 formed on the dielectric layer main surface 14 ⁇ / b> B by a connection conductor 106 that penetrates the dielectric layer 14, and is connected to an external terminal 28 provided on the connection land 104. , Drawn from the same surface as the second external electrode 20.
- the capacitance and dielectric breakdown voltage of the capacitor according to one embodiment of the present invention will be described.
- the unit capacitor (columnar electrode-dielectric layer--) that constitutes the capacitor according to the anodizing voltage used in the first stage anodizing process. Since the thickness of the dielectric layer (consisting of columnar electrodes) changes, the capacitance and breakdown voltage of the capacitor depend on the anodization voltage used for the first stage anodization. For example, the dielectric thickness (columnar electrode 16) of the capacitor manufactured by performing the first-stage anodizing process using an anodizing voltage that is 1/2 times the anodizing voltage used for manufacturing the capacitor 100 of the comparative example.
- the capacitance of the capacitor is doubled and the dielectric breakdown voltage is 1 ⁇ 2. Double. Further, since the cell size (indicating the size of the cell in plan view, D1 in FIG. 1 is an example) changes according to the anodizing voltage, the number of cells per unit area is also changed to the anodizing voltage. Will change accordingly. As a result, the capacitance per unit area can be changed even when the thickness of the element (corresponding to the distance between the first external electrode 18 and the second external electrode 20) is constant.
- a capacitor manufactured by setting the anodizing voltage to 1 ⁇ 2 times the voltage used to manufacture the capacitor 100 of the comparative example has a cell size 1 ⁇ 2 times that of the capacitor 100 of the comparative example, The number of cells becomes four times, and as a result, the capacity per unit area becomes four times that of the capacitor 100 of the comparative example.
- the dielectric thickness of the capacitor and the number of cells per unit area can be adjusted by the anodic oxidation voltage. For example, when the thickness of the element is specified to be constant by setting the anodic oxidation voltage to 1 ⁇ 2 times that of the capacitor 100 of the comparative example, the capacitance per unit area is 8 times and the dielectric breakdown voltage is 1 / Double the capacitor.
- a capacitor manufactured by using an anodic oxidation voltage that is 1/2 of the anodic oxidation voltage used in the manufacture of the capacitor 100 of the comparative example (sometimes referred to as an “element capacitor” in this specification) has two stages.
- the combined capacity of the capacitors connected in series is four times (8 times ⁇ 1/2) that of the capacitor 100 of the comparative example, and the total volume is twice that of the capacitor 100 of the comparative example. It becomes.
- the volume of the element capacitor to be connected may be 1 ⁇ 2 times that of the capacitor 100 of the comparative example.
- the capacitance of the element capacitor is proportional to the volume
- the capacitance of the capacitor obtained by connecting two element capacitors having a volume half that of the capacitor 100 of the comparative example in series is 2 of that of the capacitor 100 of the comparative example. Doubled (4 times x 1/2).
- the capacitor of the comparative example is connected by connecting the element capacitors manufactured using the anodic oxidation voltage that is 1 ⁇ 2 times the anodic oxidation voltage used in the manufacture of the capacitor 100 of the comparative example in series.
- a capacitor having the same volume as 100 and twice the capacity can be obtained.
- the capacitor having the element capacitors connected in series has the same dielectric breakdown resistance as the capacitor 100 of the comparative example.
- the capacitor 100 of the comparative example is connected in series by two stages of the element capacitors manufactured using the anodic oxidation voltage that is 1 ⁇ 2 times the anodic oxidation voltage used to manufacture the capacitor 100 of the comparative example.
- FIG. 2 shows a capacitor 10A according to another embodiment of the present invention.
- the capacitor 10 ⁇ / b> A has the same volume (element volume) as the capacitor 10.
- 2A is a cross-sectional view showing a laminated structure of a capacitor 10A according to another embodiment of the present invention
- FIG. 2B is a perspective view showing an enlarged part of FIG. 2A
- FIG. 2C is a schematic cross-sectional view of the cross section of FIG. 2B cut along the line # B- # B as seen from the direction of the arrow.
- the capacitor 10A is formed on one main surface 14A of the element and is electrically isolated from each other first external electrodes 18A to 18D, and the other main surface 14B is formed on the other main surface 14B and is electrically isolated from each other.
- External electrodes 20A to 20E and has an eight-stage serial structure. That is, the columnar electrode 16 and the dielectric layer 14 existing in the region between the first external electrode 18A and the second external electrode 20A constitute a first element capacitor, and the second external electrode 20A and the first external electrode The columnar electrode 16 and the dielectric layer 14 existing in the region between the external electrodes 18B constitute a second element capacitor.
- Capacitor 10A is manufactured through substantially the same process as capacitor 10 except for the value of the voltage used for the anodizing treatment. In the manufacturing process of the capacitor 10A, for example, the first stage anodization is performed using a voltage of 10 V (corresponding to 1 ⁇ 4 of the voltage in the manufacturing process of the capacitor 100).
- the anodizing process is performed at a voltage that is 1/4 times the anodizing voltage used in the manufacturing process of the capacitor 100, and the number of stages in series is set to 8 so that the volume of the element remains unchanged.
- the dielectric breakdown voltage can be doubled (1/4 times ⁇ 8 times) while maintaining the capacity (64 times ⁇ 1/64 times).
- the effect of the present invention was verified with reference to the capacitor 100 of the comparative example.
- the capacitor 100 of the comparative example was formed so that the anodizing voltage used for the first stage anodizing treatment was 40 V and the size was 1 mm ⁇ 0.5 mm ⁇ 0.1 mm.
- the capacitance value of this capacitor 100 was 0.5 ⁇ F, and the dielectric breakdown voltage was 10V.
- the capacitor 10 according to one embodiment of the present invention configured by connecting the element capacitors formed with the first stage anodizing voltage of 20 V in series in two stages, the capacitance value is 1 ⁇ F, The dielectric breakdown voltage was 10V.
- the capacitor 10 according to an embodiment of the present invention has twice the capacity while maintaining the same volume and the same dielectric breakdown resistance as the capacitor 100 of the comparative example.
- the capacitance value is 0.5 ⁇ F, insulation
- the breakdown voltage was 20V.
- the capacitor 10A according to another embodiment of the present invention has twice the breakdown voltage while maintaining the same volume and the same capacity as the capacitor 100 of the comparative example.
- the two-pole external terminals 26 and 28 can be formed on the same surface by using an even number of stages connected in series.
- an element structure having external terminals 26 and 28 each having one pole on each of the front and rear surfaces can be easily achieved by using an odd number of stages in series.
- the mounting area can be reduced as compared with the multilayer ceramic capacitor in which the external terminals need to be provided on the side surfaces.
- the capacitance value of the capacitor can be improved without sacrificing the dielectric breakdown resistance, or the dielectric breakdown resistance can be achieved without sacrificing the capacitance value. It becomes possible to improve.
- the capacitance value and the rated voltage can be easily adjusted by adjusting the anodic oxidation voltage and / or the number of stages of series connection. For example, by adjusting the anodic oxidation voltage and / or the number of stages of series connection, in the capacitors according to various embodiments of the present invention, the capacitance value is increased to reduce the rated voltage, or the capacitance value is decreased to be rated. The voltage can be increased.
- two external terminals can be provided on the front surface, or one on the front surface and the back surface, depending on the mounting form.
- the generation of cracks is suppressed by a columnar electrode structure obtained by anodizing a valve metal compared to a planar electrode structure such as a conventional multilayer ceramic capacitor. Can be manufactured easily.
- the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present invention.
- the shapes and dimensions shown in the present specification are examples, and can be appropriately changed as necessary.
- the materials shown in this specification are also examples, and various known materials can be used.
- the metal substrate 50 for forming the dielectric layer 14 various known metals that can be anodized can be used in addition to Al.
- the anodic oxidation voltage and the number of element capacitors connected in series (number of stages) shown in this specification are examples, and the anodic oxidation voltage and the number of stages can be adjusted to satisfy the requirements of capacity and rated voltage. is there.
- the electrode lead-out structure shown in this specification is also an example, and the design can be changed as appropriate.
- the manufacturing process shown in this specification is also an example, and can be changed as appropriate.
- any of the first external electrode 18 and the second external electrodes 20A and 20B may be formed first.
- Capacitors capable of improving the capacitance value without sacrificing the dielectric breakdown voltage by the capacitors according to various embodiments of the present invention and the manufacturing method thereof, or the dielectric breakdown voltage without sacrificing the capacitance value A capacitor that can be improved and a method for manufacturing the same are provided.
Abstract
Description
12、12A:コンデンサ素子
14:誘電体層
14A、14B:主面
16:柱状電極
16A、16B:端部
18、18A~18D:第1の外部電極
20、20A~20E:第2の外部電極
22、24:絶縁キャップ
26、28:外部端子
30、32:保護層
50:金属基材
52:第1の孔
54:酸化物基材
56:第2の孔
58:シード層
100:コンデンサ
102:コンデンサ素子
104:接続ランド
106:接続導体
900:セラミック積層体
910、912:引出電極
920、922:外部電極
930:浮き電極
940、942:単位コンデンサユニット
Claims (2)
- 互いに略平行に形成された第1の主面及び第2の主面を有するとともに、前記第1及び第2の主面に略直交するように形成された複数の孔を有する誘電体層と、
前記複数の孔に導電体を充填して形成された複数の柱状電極と、
前記誘電体層の前記第1の主面に、前記複数の柱状電極の一部の柱状電極と導通するように形成された第1の外部電極と、
前記誘電体層の前記第2の主面に、前記複数の柱状電極のうち、前記第1の外部電極と導通していないものと導通するように形成された第2の外部電極と、を備え、
前記第1又は第2の外部電極の少なくとも一方が、互いに電気的に隔離された複数の導電体ユニットからなるコンデンサ。 - 互いに略平行に形成された第1の主面及び第2の主面を有する弁金属の基材を準備する工程と、
前記基材を陽極酸化し、前記第1及び第2の主面に略直交する複数の孔が形成された誘電体層を形成する工程と、
前記誘電体層の前記複数の孔に導電体を充填して複数の柱状電極を形成する工程と、
前記第1の主面に、前記複数の柱状電極の一部の柱状電極と導通する第1の外部電極を形成する工程と、
前記第2の主面に、前記複数の柱状電極のうち、前記第1の外部電極と非導通の柱状電極と導通する第2の外部電極を形成する工程と、
を含み、
前記第1又は第2の外部電極の少なくとも一方を、互いに電気的に隔離されるように形成するコンデンサの製造方法。
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/807,273 US20130148259A1 (en) | 2010-06-30 | 2011-05-26 | Capacitor and method of manufacturing same |
JP2012522524A JP5416840B2 (ja) | 2010-06-30 | 2011-05-26 | コンデンサ及びその製造方法 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2010150018 | 2010-06-30 | ||
JP2010-150018 | 2010-06-30 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2012002083A1 true WO2012002083A1 (ja) | 2012-01-05 |
Family
ID=45401815
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2011/062048 WO2012002083A1 (ja) | 2010-06-30 | 2011-05-26 | コンデンサ及びその製造方法 |
Country Status (3)
Country | Link |
---|---|
US (1) | US20130148259A1 (ja) |
JP (1) | JP5416840B2 (ja) |
WO (1) | WO2012002083A1 (ja) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2013201318A (ja) * | 2012-03-26 | 2013-10-03 | Taiyo Yuden Co Ltd | ポーラスコンデンサ |
US20140153157A1 (en) * | 2012-12-05 | 2014-06-05 | Taiyo Yuden Co., Ltd. | Capacitor |
WO2015064200A1 (ja) * | 2013-10-30 | 2015-05-07 | 太陽誘電株式会社 | コンデンサ |
JP2016004827A (ja) * | 2014-06-13 | 2016-01-12 | 太陽誘電株式会社 | コンデンサ、回路モジュール及び移動体通信機器 |
JP2016058618A (ja) * | 2014-09-11 | 2016-04-21 | 太陽誘電株式会社 | 電子部品、回路モジュール及び電子機器 |
JP2016058528A (ja) * | 2014-09-09 | 2016-04-21 | 太陽誘電株式会社 | 電子部品、回路モジュール及び電子機器 |
US20160233026A1 (en) * | 2014-03-28 | 2016-08-11 | Taiyo Yuden Co., Ltd. | Capacitor |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105321886B (zh) * | 2014-05-29 | 2019-07-05 | 联华电子股份有限公司 | 电容器结构及其制造方法 |
CN111033656A (zh) | 2017-11-30 | 2020-04-17 | 株式会社村田制作所 | 电容器 |
US20230074009A1 (en) * | 2020-03-12 | 2023-03-09 | Rohm Co., Ltd. | Capacitor and method for producing capacitor |
KR20230089157A (ko) * | 2021-12-13 | 2023-06-20 | 삼성전기주식회사 | 적층형 커패시터 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009049212A (ja) * | 2007-08-20 | 2009-03-05 | Taiyo Yuden Co Ltd | コンデンサ及びその製造方法 |
WO2009051133A1 (ja) * | 2007-10-17 | 2009-04-23 | Showa Denko K.K. | コンデンサの製造方法、コンデンサ、配線板、電子機器及びicカード |
JP2011023439A (ja) * | 2009-07-14 | 2011-02-03 | Shinko Electric Ind Co Ltd | キャパシタ及びその製造方法 |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1255597A (en) * | 1916-10-16 | 1918-02-05 | Georges Giles | Industrial electrical capacity-battery. |
US4419713A (en) * | 1981-07-06 | 1983-12-06 | Centre Engineering, Inc. | Multiple electrode series capacitor |
US4985926A (en) * | 1988-02-29 | 1991-01-15 | Motorola, Inc. | High impedance piezoelectric transducer |
JPH10241993A (ja) * | 1997-02-27 | 1998-09-11 | Tokin Corp | 積層セラミック電子部品 |
JPH10261546A (ja) * | 1997-03-19 | 1998-09-29 | Murata Mfg Co Ltd | 積層コンデンサ |
KR20000047400A (ko) * | 1998-12-19 | 2000-07-25 | 이형도 | 고주파형 공진자 및 그 제조방법 |
US6760215B2 (en) * | 2001-05-25 | 2004-07-06 | Daniel F. Devoe | Capacitor with high voltage breakdown threshold |
JP4013734B2 (ja) * | 2002-11-06 | 2007-11-28 | 松下電器産業株式会社 | Mim容量 |
US7009276B2 (en) * | 2003-09-26 | 2006-03-07 | Kyocera Corporation | Thin film capacitor, thin film capacitor array and electronic component |
US7133274B2 (en) * | 2005-01-20 | 2006-11-07 | Matsushita Electric Industrial Co., Ltd. | Multilayer capacitor and mold capacitor |
JP4357577B2 (ja) * | 2007-06-14 | 2009-11-04 | 太陽誘電株式会社 | コンデンサ及びその製造方法 |
US8027145B2 (en) * | 2007-07-30 | 2011-09-27 | Taiyo Yuden Co., Ltd | Capacitor element and method of manufacturing capacitor element |
-
2011
- 2011-05-26 US US13/807,273 patent/US20130148259A1/en not_active Abandoned
- 2011-05-26 JP JP2012522524A patent/JP5416840B2/ja active Active
- 2011-05-26 WO PCT/JP2011/062048 patent/WO2012002083A1/ja active Application Filing
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009049212A (ja) * | 2007-08-20 | 2009-03-05 | Taiyo Yuden Co Ltd | コンデンサ及びその製造方法 |
WO2009051133A1 (ja) * | 2007-10-17 | 2009-04-23 | Showa Denko K.K. | コンデンサの製造方法、コンデンサ、配線板、電子機器及びicカード |
JP2011023439A (ja) * | 2009-07-14 | 2011-02-03 | Shinko Electric Ind Co Ltd | キャパシタ及びその製造方法 |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2013201318A (ja) * | 2012-03-26 | 2013-10-03 | Taiyo Yuden Co Ltd | ポーラスコンデンサ |
US20140153157A1 (en) * | 2012-12-05 | 2014-06-05 | Taiyo Yuden Co., Ltd. | Capacitor |
US9299495B2 (en) * | 2012-12-05 | 2016-03-29 | Taiyo Yuden Co., Ltd. | Capacitor |
WO2015064200A1 (ja) * | 2013-10-30 | 2015-05-07 | 太陽誘電株式会社 | コンデンサ |
US9818537B2 (en) | 2013-10-30 | 2017-11-14 | Taiyo Yuden Co., Ltd. | Capacitor |
US20160233026A1 (en) * | 2014-03-28 | 2016-08-11 | Taiyo Yuden Co., Ltd. | Capacitor |
JP2016004827A (ja) * | 2014-06-13 | 2016-01-12 | 太陽誘電株式会社 | コンデンサ、回路モジュール及び移動体通信機器 |
JP2016058528A (ja) * | 2014-09-09 | 2016-04-21 | 太陽誘電株式会社 | 電子部品、回路モジュール及び電子機器 |
JP2016058618A (ja) * | 2014-09-11 | 2016-04-21 | 太陽誘電株式会社 | 電子部品、回路モジュール及び電子機器 |
Also Published As
Publication number | Publication date |
---|---|
JPWO2012002083A1 (ja) | 2013-08-22 |
US20130148259A1 (en) | 2013-06-13 |
JP5416840B2 (ja) | 2014-02-12 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP5416840B2 (ja) | コンデンサ及びその製造方法 | |
US8134826B2 (en) | Capacitor and method of manufacturing the same | |
US8023249B2 (en) | Capacitor and method of manufacturing the same | |
US10658111B2 (en) | Capacitor | |
US8064189B2 (en) | Capacitor structure to enhance capacitive density and reduce equivalent series inductance | |
CN109585163B (zh) | 电容器及其制造方法 | |
US8767374B2 (en) | Capacitors and method for manufacturing the same | |
JP2012124458A (ja) | 積層セラミックコンデンサ及びその製造方法 | |
US9299495B2 (en) | Capacitor | |
KR20160104693A (ko) | 콘덴서 | |
US8917491B2 (en) | Porous capacitor | |
JP6043548B2 (ja) | コンデンサ | |
WO2016181865A1 (ja) | コンデンサおよびその製造方法 | |
JP2018063989A (ja) | 薄膜キャパシタ | |
US20160233026A1 (en) | Capacitor | |
WO2017026294A1 (ja) | コンデンサ、及び該コンデンサの製造方法 | |
JP5429392B2 (ja) | 固体電解コンデンサ及びその製造方法 | |
WO2018174132A1 (ja) | コンデンサ | |
KR100958460B1 (ko) | 금속 커패시터 및 그의 제조방법 | |
WO2018021115A1 (ja) | コンデンサ、及び該コンデンサの製造方法 | |
KR100958458B1 (ko) | 금속 커패시터 및 그의 제조방법 | |
JP2010182745A (ja) | 固体電解コンデンサの製造方法 | |
KR20240024628A (ko) | 커패시터 부품 | |
JP2016004827A (ja) | コンデンサ、回路モジュール及び移動体通信機器 | |
JP2011176219A (ja) | 固体電解コンデンサおよびその製造方法 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 11800552 Country of ref document: EP Kind code of ref document: A1 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2012522524 Country of ref document: JP |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
WWE | Wipo information: entry into national phase |
Ref document number: 13807273 Country of ref document: US |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 11800552 Country of ref document: EP Kind code of ref document: A1 |