CN117461104A - Thin film capacitor - Google Patents
Thin film capacitor Download PDFInfo
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- CN117461104A CN117461104A CN202280040136.8A CN202280040136A CN117461104A CN 117461104 A CN117461104 A CN 117461104A CN 202280040136 A CN202280040136 A CN 202280040136A CN 117461104 A CN117461104 A CN 117461104A
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- electrode
- short
- divided
- thin film
- divided electrode
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- 239000003990 capacitor Substances 0.000 title claims abstract description 174
- 239000010409 thin film Substances 0.000 title claims abstract description 140
- 239000010408 film Substances 0.000 claims abstract description 88
- 230000000694 effects Effects 0.000 description 19
- 238000010586 diagram Methods 0.000 description 8
- 238000004804 winding Methods 0.000 description 5
- 238000007740 vapor deposition Methods 0.000 description 3
- 239000004743 Polypropylene Substances 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 239000011888 foil Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 description 2
- 239000005020 polyethylene terephthalate Substances 0.000 description 2
- -1 polypropylene Polymers 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
Classifications
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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
- H01G2/00—Details of capacitors not covered by a single one of groups H01G4/00-H01G11/00
- H01G2/14—Protection against electric or thermal overload
- H01G2/16—Protection against electric or thermal overload with fusing elements
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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
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/32—Wound capacitors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- 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
- H01G4/40—Structural combinations of fixed capacitors with other electric elements, the structure mainly consisting of a capacitor, e.g. RC combinations
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Manufacturing & Machinery (AREA)
- Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
Abstract
The thin film capacitor includes a dielectric thin film, a first electrode disposed on the first surface, and a second electrode disposed on the second surface. The film capacitor includes three unit capacitors connected in series in a short side direction (S). The first electrode is separated into a first non-divided electrode and a first divided electrode. The first dividing electrode is divided into a plurality of first small electrode groups. The plurality of first microelectrode groups each include a plurality of first microelectrodes connected by first fuses. The second electrode is separated into a second non-divided electrode and a second divided electrode. The second divided electrode is divided into a plurality of second small electrode groups. The plurality of second microelectrode groups each include a plurality of second microelectrodes connected by a second fuse.
Description
Technical Field
The present disclosure relates generally to film capacitors, and more particularly, to film capacitors used in electronic devices, electrical devices, industrial devices, automobiles, and the like.
Background
Patent document 1 discloses a thin film capacitor. The film capacitor has a structure in which two capacitors are connected in series.
Specifically, the film capacitor of patent document 1 is a film capacitor having a structure in which two films are stacked and wound in a cylindrical shape.
Further, on one side of the two films, two common electrodes are vapor deposited, which are divided into two portions in the film width direction orthogonal to the winding direction and are continuous in the winding direction.
Further, vapor deposition is performed on the other surface of the one film or the other film, and the film is divided into two portions in the width direction of the film and into a plurality of partial electrodes in the winding direction.
Further, two partial electrodes of the plurality of groups of the divided partial electrodes arranged in the film width direction are connected to each other in each group via a safety mechanism located between the two partial electrodes.
Prior art literature
Patent literature
Patent document 1: japanese patent laid-open publication No. 2014-067793
Disclosure of Invention
Problems to be solved by the invention
The film capacitor of patent document 1 has a structure in which two capacitors are connected in series, thereby realizing a higher withstand voltage.
However, if the capacitor is used at a higher voltage, there is a problem that it is difficult to maintain the function as a whole of the thin film capacitor.
The purpose of the present disclosure is to provide a thin film capacitor that can maintain the function as a whole even when used at high voltages.
Means for solving the problems
A thin film capacitor according to one aspect of the present disclosure includes: a dielectric thin film having a first surface and a second surface opposite to the first surface, the dielectric thin film extending in a long-side direction orthogonal to a short-side direction; a first electrode disposed on the first surface; and a second electrode disposed on the second surface.
The film capacitor includes three unit capacitors connected in series in the short side direction by the first electrode and the second electrode facing each other with the dielectric film interposed therebetween.
The first electrode is separated into a first non-divided electrode and a first divided electrode extending in the longitudinal direction by a first edge portion extending in the longitudinal direction.
The first divided electrode is divided into a plurality of first small electrode groups arranged in the longitudinal direction by a first short-side direction slit portion extending in the short-side direction.
The plurality of first microelectrode groups each include a plurality of first microelectrodes connected by first fuses.
The second electrode is separated into a second non-divided electrode and a second divided electrode extending in the longitudinal direction by a second edge portion extending in the longitudinal direction.
The second dividing electrode is divided into a plurality of second small electrode groups arranged in the longitudinal direction by a second short-side direction slit portion extending in the short-side direction.
The plurality of second microelectrode groups each include a plurality of second microelectrodes connected by a second fuse.
Effects of the invention
According to the present disclosure, even when used at a high voltage, the function as a whole can be maintained.
Drawings
Fig. 1 is an explanatory diagram showing a thin film capacitor according to a first embodiment.
Fig. 2 a is an explanatory diagram showing a case where the first electrode and the second electrode of the thin film capacitor according to the first embodiment face each other. Fig. 2B is an explanatory diagram showing a case where the first electrode and the second electrode of the thin film capacitor according to the second embodiment face each other.
Fig. 3 is an explanatory diagram showing a thin film capacitor according to a third embodiment.
Fig. 4 is an explanatory view showing a case where the first electrode and the second electrode of the thin film capacitor are opposed to each other.
Fig. 5 is a schematic cross-sectional view showing a thin film capacitor according to a fourth embodiment.
Fig. 6 is an explanatory diagram showing the thin film capacitor.
Fig. 7 a is a schematic cross-sectional view showing a film capacitor including one unit capacitor in the short side direction. Fig. 7B is an explanatory diagram showing the thin film capacitor.
Fig. 8 a is a schematic cross-sectional view showing a film capacitor including two unit capacitors connected in series in the short side direction. Fig. 8B is an explanatory diagram showing the thin film capacitor.
Fig. 9 a is a schematic cross-sectional view showing a film capacitor including three unit capacitors connected in series in the short side direction. Fig. 9B is an explanatory diagram showing the thin film capacitor.
Fig. 10 is a schematic perspective view showing an example of a film capacitor.
Detailed Description
1. Summary of the inventionsummary
Fig. 10 shows an example of the film capacitor 1. The film capacitor 1 is cylindrical, for example. The film capacitor 1 is formed by, for example, overlapping and winding two elongated dielectric films 2 (a first dielectric film 21 and a second dielectric film 22).
Here, the first electrode 31 is disposed on one surface of the first dielectric film 21. The second electrode 32 is disposed on one surface of the second dielectric film 22. In the thin film capacitor 1, the first electrode 31 and the second electrode 32 face each other through the dielectric thin film 2. End face electrodes 30 (first end face electrode 310 and second end face electrode 320) are formed at both ends of the thin film capacitor 1. The first electrode 31 is connected to the first terminal electrode 310. The second electrode 32 is connected to the second end surface electrode 320. The thin film capacitor 1 can be charged by applying a voltage between the first end surface electrode 310 and the second end surface electrode 320.
The thin film capacitor 1 may include 1 to 3 unit capacitors 10 in the short side direction S (width direction) of the dielectric thin film 2 (see a of fig. 7, a of fig. 8, and a of fig. 9). This will be explained below. In addition, one side in the short side direction S is sometimes referred to as "left side", and the other side is sometimes referred to as "right side".
The film capacitor 1 shown in a of fig. 7 includes one unit capacitor 10 in the short side direction S of the dielectric film 2.
As shown in fig. 7B, a first end edge portion 241 is disposed at the right end of one surface of the first dielectric film 21. The first electrode 31 is disposed on the entire surface of the first dielectric film 21 except the first end edge portion 241. The first electrode 31 includes a left end portion of one surface of the first dielectric thin film 21, and is connected to the first terminal electrode 310 at this portion (see a in fig. 7). The first electrode 31 is separated from the second end surface electrode 320 by the presence of the first end edge portion 241.
On the other hand, a second end edge 242 is disposed at the left end of one surface of the second dielectric thin film 22. The second electrode 32 is disposed entirely on one surface of the second dielectric film 22 except the second end edge 242. The second electrode 32 includes a right end portion of one surface of the second dielectric thin film 22, and is connected to the second end surface electrode 320 at this portion (see a in fig. 7). The second electrode 32 is separated from the first end face electrode 310 by the presence of the second end edge portion 242.
As shown in a of fig. 7, one unit capacitor 10 is formed at a portion where the first electrode 31 and the second electrode 32 face each other with the dielectric thin film 2 (first dielectric thin film 21) interposed therebetween.
The film capacitor 1 shown in a of fig. 8 includes two unit capacitors 10 connected in series in the short side direction S of the dielectric film 2.
As shown in fig. 8B, the first electrode 31 is divided into left and right sides by the first edge 211. The left first electrode 31 includes a left end portion of one surface of the first dielectric film 21, and is connected to the first terminal electrode 310 at this portion. The right first electrode 31 includes a right end portion of one surface of the first dielectric thin film 21, and is connected to the second end surface electrode 320 at this portion (see a in fig. 8).
On the other hand, the second end edge 242 is disposed at the left and right ends of one surface of the second dielectric thin film 22. The second electrode 32 is disposed entirely between the second end edge portions 242 on both sides. The second electrode 32 is separated from the first end surface electrode 310 and the second end surface electrode 320 by the presence of the second end edge portions 242 on both sides.
As shown in a of fig. 8, two unit capacitors 10 are formed at the portion where the first electrode 31 and the second electrode 32 face each other with the dielectric thin film 2 (first dielectric thin film 21) interposed therebetween. These unit capacitors 10 are connected in series in the short-side direction S.
Therefore, when the voltages applied to the thin film capacitor 1 shown in a of fig. 7 and a of fig. 8 are the same, the voltage applied to the unit capacitor 10 by the thin film capacitor 1 shown in a of fig. 8 becomes small, and thus damage to the dielectric thin film 2 is easily suppressed.
The film capacitor 1 shown in a of fig. 9 includes three unit capacitors 10 connected in series in the short side direction S of the dielectric film 2.
As shown in fig. 9B, the first electrode 31 is divided into left and right sides by the first edge 211. The left first electrode 31 includes a left end portion of one surface of the first dielectric thin film 21, and is connected to the first terminal electrode 310 at this portion (see a in fig. 9). A first end edge portion 241 is disposed at the right end of one surface of the first dielectric film 21. The right first electrode 31 is disposed entirely between the first edge 211 and the first end edge 241. By the presence of the first end edge portion 241, the first electrode 31 on the right side is separated from the second end surface electrode 320.
On the other hand, the second electrode 32 is divided into left and right sides by the second edge portion 212. The right second electrode 32 includes a right end portion of one surface of the second dielectric film 22, and is connected to the second end surface electrode 320 at this portion (see a in fig. 9). A second end edge 242 is disposed at the left end of one surface of the second dielectric film 22. The left second electrode 32 is disposed entirely between the second end edge 242 and the second edge 212. The second electrode 32 on the left is separated from the first end face electrode 310 by the presence of the second end edge portion 242.
As shown in a of fig. 9, three unit capacitors 10 are formed at the portions of the first electrode 31 and the second electrode 32 facing each other with the dielectric thin film 2 (first dielectric thin film 21) interposed therebetween. These unit capacitors 10 are connected in series in the short-side direction S.
Therefore, in the case where the voltages applied to the thin film capacitors 1 shown in a of fig. 7, a of fig. 8, and a of fig. 9 are the same, among these thin film capacitors 1, the voltage applied to the unit capacitor 10 of the thin film capacitor 1 shown in a of fig. 9 becomes minimum, whereby damage to the dielectric thin film 2 is more easily suppressed.
The present inventors have further improved the thin film capacitor 1 shown in fig. 9 a and 9B and developed the thin film capacitor 1 described below.
That is, as shown in fig. 1, the first electrode 31 is separated into the first non-divided electrode 41 and the first divided electrode 51 by the first edge portion 211. The first divided electrode 51 is divided into a plurality of first small electrode groups 510 by the first short-side direction slit portion 221. The plurality of first small electrode groups 510 respectively include a plurality of first small electrodes 511. The plurality of first small electrodes 511 are connected through a first fuse 61.
On the other hand, the second electrode 32 is separated into the second non-divided electrode 42 and the second divided electrode 52 by the second edge portion 212. The second divided electrode 52 is divided into a plurality of second small electrode groups 520 by the second short-side direction slit portion 222. The plurality of second small electrode groups 520 respectively include a plurality of second small electrodes 521. The plurality of second small electrodes 521 are connected through the second fuse 62.
The first unit capacitor 10 is formed at a portion (Z1 portion in fig. 1) where the first non-divided electrode 41 and the left second small electrode 521 face each other with the dielectric thin film 2 interposed therebetween. The second unit capacitor 10 is formed at a portion (Z2 portion in fig. 1) where the first small electrode 511 on the left side and the second small electrode 521 on the right side face each other with the dielectric thin film 2 interposed therebetween. The third unit capacitor 10 is formed at a portion (Z3 portion in fig. 1) where the first small electrode 511 on the right side and the second non-divided electrode 42 face each other with the dielectric thin film 2 interposed therebetween. These three unit capacitors 10 are connected in series in the short-side direction S.
Further, since the plurality of first small electrodes 511 are connected by the first fuse 61 and the plurality of second small electrodes 521 are connected by the second fuse 62, at least one of the first fuse 61 and the second fuse 62 is cut even if a part between the first electrode 31 and the second electrode 32 is short-circuited.
Therefore, according to the present embodiment, even when used at a high voltage, the function as a whole can be maintained. However, the film capacitor 1 according to the present embodiment may be a roll type or a laminate type.
2. Detailed description
(1) First embodiment
Hereinafter, a thin film capacitor 1 according to a first embodiment will be described with reference to the drawings.
As shown in fig. 1, the film capacitor 1 includes a dielectric film 2, a first electrode 31, and a second electrode 32.
The film capacitor 1 includes three unit capacitors 10, and the three unit capacitors 10 are connected in series in the short side direction S by the first electrode 31 and the second electrode 32 facing each other through the dielectric film 2 (the first dielectric film 21 in the present embodiment) (see a in fig. 9).
The dielectric thin film 2, the first electrode 31, and the second electrode 32 will be described below.
< dielectric film >
The dielectric thin film 2 is a thin film made of a dielectric. The dielectric is not particularly limited, and examples thereof include polypropylene (PP), polyethylene terephthalate (PET), and the like.
The dielectric thin film 2 has a thin and long film shape. That is, the dielectric thin film 2 extends in the longitudinal direction L orthogonal to the short-side direction S.
The dielectric thin film 2 has a first surface 201 and a second surface 202 (see a of fig. 9). The first surface 201 faces one side in the thickness direction T of the dielectric thin film 2. The thickness direction T is a direction orthogonal to the short side direction S and the long side direction L. The second face 202 is the opposite side of the first face 201. That is, the second surface 202 is a surface facing the other side in the thickness direction T of the dielectric thin film 2.
In the present embodiment, the dielectric thin film 2 includes a first dielectric thin film 21 and a second dielectric thin film 22.
< first electrode >
The first electrode 31 may be any one of a vapor deposition electrode, a metal foil electrode, and a plating electrode. The material of the first electrode 31 is not particularly limited, and examples thereof include aluminum.
The first electrode 31 is disposed on the first surface 201 of the dielectric thin film 2 (in the present embodiment, the first dielectric thin film 21).
The first electrode 31 is separated into a first non-divided electrode 41 and a first divided electrode 51 by the first edge portion 211.
The first edge 211 is a portion where the first electrode 31 is not disposed on the first surface 201 of the first dielectric film 21. Thus, the dielectric thin film 2 is exposed at this portion. The first edge 211 extends in the longitudinal direction L with a fixed width.
The first non-divided electrode 41 is an electrode having a whole surface shape extending in the longitudinal direction L. That is, the first non-divided electrode 41 is disposed entirely between the first edge 211 and one (left) end of the first dielectric film 21 in the short side direction S. The left end of the first non-divided electrode 41 can be connected to a first terminal electrode 310 (not shown in fig. 1).
On the other hand, the first divided electrode 51 is disposed between the first edge 211 and the first end edge 241.
Here, the first end edge portion 241 is present at the other (right) end of the first dielectric film 21 in the short side direction S. The first end edge portion 241 is a portion where the first electrode 31 is not disposed, similarly to the first edge portion 211. Therefore, the dielectric thin film 2 is also exposed at this portion. The first end edge portion 241 extends in the longitudinal direction L with a fixed width. The first divided electrode 51 and the second end surface electrode 320 (not shown in fig. 1) can be separated by the presence of the first end edge portion 241. In the present embodiment, the width of the first end edge portion 241 is the same as the width of the first edge portion 211, but may be different within a range that does not impair the effect of the present embodiment.
Further, the first divided electrode 51 is divided into a plurality of first small electrode groups 510 by at least one or more first short-side slit portions 221.
The first short-side slit 221 is a portion where the first electrode 31 is not disposed on the first surface 201 of the first dielectric film 21. Therefore, the dielectric thin film 2 is exposed in this portion, similarly to the first edge 211 and the first end edge 241. The first short-side direction slit portion 221 extends in the short-side direction S with a fixed width. The first short-side slit 221 is connected to the first edge 211 and the first end edge 241. In the present embodiment, the width of the first short-side slit 221 is the same as the width of the first edge 211, but may be different within a range that does not impair the effect of the present embodiment.
The plurality of first small electrode groups 510 are arranged in the long-side direction L. The plurality of first microelectrode groups 510 each include a plurality (two in this embodiment) of first microelectrodes 511.
The plurality of first small electrodes 511 are arranged in the short-side direction S. In the present embodiment, the shape of the first small electrode 511 is rectangular, but is not particularly limited. In the present embodiment, the plurality of first small electrodes 511 have the same size, but may be different within a range that does not impair the effects of the present embodiment.
The plurality of first microelectrodes 511 included in each of the plurality of first microelectrode groups 510 are connected by the first fuse 61. The first fuse 61 is a portion that melts to cut off a circuit when an excessive current flows. The first fuses 61 connect the first small electrodes 511 adjacent to each other in the short-side direction S to each other. The width of the first fuse 61 is shorter than the length of the first small electrode 511 in the longitudinal direction L.
< second electrode >
The second electrode 32 may be any of a vapor deposition electrode, a metal foil electrode, and a plating electrode, similarly to the first electrode 31. The material of the second electrode 32 is also the same as that of the first electrode 31.
The second electrode 32 is disposed on the second surface 202 of the dielectric thin film 2 (the first dielectric thin film 21 in the present embodiment). In other words, in the present embodiment, the second electrode 32 is disposed on the first surface 201 of the second dielectric thin film 22.
The second electrode 32 is separated into the second non-divided electrode 42 and the second divided electrode 52 by the second edge portion 212.
The second edge 212 is a portion where the second electrode 32 is not disposed on the first surface 201 of the second dielectric film 22. Thus, the dielectric thin film 2 is exposed at this portion. The second edge portion 212 extends in the longitudinal direction L with a fixed width. In the present embodiment, the width of the second edge 212 is the same as the width of the first edge 211, but may be different within a range that does not impair the effect of the present embodiment.
The second non-divided electrode 42 is an electrode having a whole surface shape extending in the longitudinal direction L. That is, the second non-divided electrode 42 is disposed entirely between the second edge portion 212 and the end portion on the other side (right side) of the second dielectric thin film 22 in the short side direction S. The right end of the second non-divided electrode 42 can be connected to the second end surface electrode 320.
On the other hand, the second split electrode 52 is disposed between the second edge 212 and the second end edge 242.
Here, the second end edge 242 is present at one (left) end of the second dielectric film 22 in the short side direction S. The second end edge 242 is also a portion where the second electrode 32 is not disposed, similar to the second edge 212. Therefore, the dielectric thin film 2 is also exposed at this portion. The second end edge portion 242 extends in the longitudinal direction L with a fixed width. By the presence of the second end edge portion 242, the second split electrode 52 can be separated from the first end face electrode 310. In the present embodiment, the width of the second end edge 242 is the same as the width of the second edge 212, but may be different within a range that does not impair the effect of the present embodiment.
Further, the second divided electrode 52 is divided into a plurality of second small electrode groups 520 by at least one or more second short-side slit portions 222.
The second short-side slit 222 is a portion where the second electrode 32 is not disposed on the first surface 201 of the second dielectric film 22. Therefore, the dielectric thin film 2 is exposed in this portion as well, similarly to the second edge 212 and the second end edge 242. The second short-side direction slit portion 222 extends in the short-side direction S with a fixed width. The second short-side slit portion 222 is connected to the second edge portion 212 and the second end edge portion 242. In the present embodiment, the width of the second short-side slit portion 222 is the same as the width of the second edge portion 212, but may be different within a range that does not impair the effect of the present embodiment. Further, in the present embodiment, the width of the second short-side slit portion 222 is the same as the width of the first short-side slit portion 221, but may be different within a range that does not impair the effect of the present embodiment.
The plurality of second electrode groups 520 are arranged in the longitudinal direction L. The plurality of second small electrode groups 520 each include a plurality (two in the present embodiment) of second small electrodes 521.
The plurality of second small electrodes 521 are arranged in the short-side direction S. In the present embodiment, the shape of the second small electrode 521 is rectangular, but is not particularly limited. In the present embodiment, the plurality of second small electrodes 521 are the same in size, but may be different within a range that does not impair the effects of the present embodiment. Further, in the present embodiment, the shape and size of the second small electrode 521 are the same as those of the first small electrode 511, but may be different within a range that does not impair the effects of the present embodiment.
The plurality of second sub-electrodes 521 included in each of the plurality of second sub-electrode groups 520 are connected by the second fuse 62. The second fuse 62 is also a part that melts and cuts off a circuit when an excessive current flows, similarly to the first fuse 61. The second fuses 62 connect the second small electrodes 521 adjacent to each other in the short-side direction S to each other. The width of the second fuse 62 is shorter than the length of the second small electrode 521 in the longitudinal direction L.
The second electrode 32 described above is opposed to the first electrode 31 through the dielectric thin film 2 (the first dielectric thin film 21 in the present embodiment).
Specifically, the second divided electrode 52 of the second electrode 32 has a portion (Z1 portion in fig. 1) facing the first non-divided electrode 41 of the first electrode 31 through the dielectric thin film 2. More specifically, the second small electrode 521 on the left side of the second electrode 32 faces the first non-divided electrode 41 of the first electrode 31 through the dielectric thin film 2. A first unit capacitor 10 is formed at this portion.
The second divided electrode 52 of the second electrode 32 has a portion (Z2 portion in fig. 1) facing the first divided electrode 51 of the first electrode 31 through the dielectric thin film 2. More specifically, the second small electrode 521 on the right side of the second electrode 32 is opposed to the first small electrode 511 on the left side of the first electrode 31 via the dielectric thin film 2. A second unit capacitor 10 is formed at this portion.
The second non-divided electrode 42 of the second electrode 32 has a portion (portion Z3 in fig. 1) facing the first divided electrode 51 of the first electrode 31 through the dielectric thin film 2. More specifically, the second non-divided electrode 42 of the second electrode 32 is opposed to the first small electrode 511 on the right side of the first electrode 31 through the dielectric thin film 2. A third unit capacitor 10 is formed at this portion.
< Effect >
According to the present embodiment, even when the thin film capacitor 1 is used at a high voltage, the function as a whole can be maintained.
That is, the film capacitor 1 according to the present embodiment includes three unit capacitors 10 connected in series in the short side direction S of the dielectric film 2, like the film capacitor 1 shown in a of fig. 9. Therefore, when the voltage applied between the first end surface electrode 310 and the second end surface electrode 320 of the thin film capacitor 1 shown in a of fig. 7 and a of fig. 8 is the same as the voltage applied between the first end surface electrode 310 and the second end surface electrode 320 of the thin film capacitor 1 according to the present embodiment, the voltage applied to the unit capacitor 10 of the thin film capacitor 1 according to the present embodiment is smaller than the voltage applied to the unit capacitor 10 of the thin film capacitor 1 shown in a of fig. 7 and a of fig. 8, and thus damage to the dielectric thin film 2 is more easily suppressed.
Further, in the film capacitor 1 according to the present embodiment, as shown in fig. 1, the plurality of first small electrodes 511 are connected by the first fuse 61, and the plurality of second small electrodes 521 are connected by the second fuse 62. Therefore, even if a part between the first electrode 31 and the second electrode 32 is short-circuited, at least one of the first fuse 61 and the second fuse 62 is cut.
Therefore, according to the present embodiment, even when the thin film capacitor 1 is used at a high voltage, the function as a whole can be maintained.
(2) Second embodiment
Next, a thin film capacitor 1 according to a second embodiment will be described with reference to the drawings. In the second embodiment, the same reference numerals as those in the first embodiment may be given to the same components as those in the first embodiment, and detailed description thereof may be omitted.
In the thin film capacitor 1 according to the second embodiment shown in fig. 2B, there are a portion (Z1 portion) where the first non-divided electrode 41 and the second divided electrode 52 face each other with the dielectric thin film 2 interposed therebetween, a portion (Z2 portion) where the first divided electrode 51 and the second divided electrode 52 face each other, and a portion (Z3 portion) where the first divided electrode 51 and the second non-divided electrode 42 face each other, as in the thin film capacitor 1 according to the first embodiment shown in fig. 2 a.
First short-side slit part
The film capacitor 1 according to the present embodiment is different from the film capacitor 1 according to the first embodiment in that the width of the first short-side slit portion 221 is different depending on the location. This will be explained below.
As shown in a of fig. 2, in the thin film capacitor 1 according to the first embodiment, the width of the first short-side slit 221 at the portion (Z2 portion) where the first divided electrode 51 faces the second divided electrode 52 is the same as the width of the first short-side slit 221 at the portion (Z3 portion) where the first divided electrode 51 faces the second non-divided electrode 42.
However, the unit capacitor 10 is formed at a portion where the first electrode 31 and the second electrode 32 face each other, but is not formed at a portion where the first electrode 31 and the second electrode 32 do not face each other. For example, the unit capacitor 10 is not formed at a portion of the first electrode 31 facing the second short-side slit portion 222 (see the Xa portion surrounded by the one-dot chain line). Similarly, the unit capacitor 10 (see Xa) is not formed at a portion of the first short-side slit 221 facing the second electrode 32.
Therefore, in particular, in the portion (Z2 portion) where the first divided electrode 51 and the second divided electrode 52 face each other, these facing portions are preferable as compared with the case where the first short-side slit portion 221 and the second short-side slit portion 222 do not face each other. More specifically, it is preferable that the area of the first short-side slit 221 facing the second short-side slit 222 be larger. This is because, if the first short-side slit 221 and the second short-side slit 222 are not opposed to each other, the capacity of the unit capacitor 10 in the Z2 portion is reduced by an amount corresponding to these widths. Conversely, in the Z2 portion, the larger the area of the first short-side slit portion 221 facing the second short-side slit portion 222 is, the larger the electrode area (the area of the first electrode 31 facing the second electrode 32) of the unit capacitor 10 is relatively, and therefore, the reduction in the capacity of the unit capacitor 10 can be suppressed.
The above-described problem hardly occurs in the portion (Z1 portion) where the first non-divided electrode 41 and the second divided electrode 52 are opposed to each other and the portion (Z3 portion) where the first divided electrode 51 and the second non-divided electrode 42 are opposed to each other. This is because, in the Z1 portion, the first non-divided electrode 41 is an electrode having a planar shape, and therefore, even if the second short-side slit portion 222 facing the first non-divided electrode 41 is present at any position in the long-side direction L, the capacity of the unit capacitor 10 in the Z1 portion hardly changes. The same applies to the Z3 portion.
On the other hand, in the portion (Z2 portion) where the first divided electrode 51 and the second divided electrode 52 face each other, the first short-side slit portion 221 and the second short-side slit portion 222 are desirably opposed to each other, but in reality, the first short-side slit portion 221 and the second short-side slit portion 222 may not be opposed to each other. As one of the reasons for this, as shown in fig. 10, two dielectric films 2 (a first dielectric film 21 and a second dielectric film 22) are stacked and wound. In this case, since the first electrode 31 and the second electrode 32 are separated by the thickness of the dielectric thin film 2 in the thickness direction T, when the two dielectric thin films 2 are wound in a superimposed manner, the first electrode 31 and the second electrode 32 are offset little by little in the winding direction (longitudinal direction L). As a result, the first short-side slit 221 and the second short-side slit 222 may not face each other. Then, the capacity of the unit capacitor 10 in the Z2 portion is reduced by an amount (Xa portion) corresponding to the sum of the widths of the first short-side slit portion 221 and the second short-side slit portion 222 to the maximum, and a difference from the capacities of the unit capacitors 10 in the Z1 and Z3 portions can be obtained. Therefore, in the case where a voltage is applied between the first end surface electrode 310 and the second end surface electrode 320 of the film capacitor 1, the voltage applied to the three unit capacitors 10 connected in series in the short-side direction S may become uneven.
Therefore, in the thin film capacitor 1 according to the second embodiment shown in fig. 2B, the width Wa1 of the first short-side slit 221 at the portion (Z2 portion) where the first divided electrode 51 faces the second divided electrode 52 is smaller than the width Wb1 of the first short-side slit 221 at the portion (Z3 portion) where the first divided electrode 51 faces the second non-divided electrode 42 (Wa 1 < Wb 1). Accordingly, since the area of the first electrode 31 in the Z2 portion is relatively increased, even when the first short-side slit portion 221 and the second short-side slit portion 222 are not opposed to each other, a decrease in the capacity of the unit capacitor 10 in the Z2 portion can be suppressed.
Second short-side slit part
Further, the film capacitor 1 according to the present embodiment is different from the film capacitor 1 according to the first embodiment in that the width of the slit portion 222 in the second short-side direction is different depending on the location. In the following, the same idea as that of the first short-side slit portion 221 described above is applied to the second short-side slit portion 222.
That is, in the film capacitor 1 according to the second embodiment shown in fig. 2B, the width Wa2 of the second short-side slit portion 222 at the portion (Z2 portion) where the first divided electrode 51 and the second divided electrode 52 face each other is made smaller than the width Wb2 of the second short-side slit portion 222 at the portion (Z1 portion) where the first non-divided electrode 41 and the second divided electrode 52 face each other (Wa 2 < Wb 2). Accordingly, since the area of the second electrode 32 in the Z2 portion is relatively increased, even when the first short-side slit portion 221 and the second short-side slit portion 222 are not opposed to each other, a decrease in the capacity of the unit capacitor 10 in the Z2 portion can be further suppressed.
First short-side slit portion and second short-side slit portion)
In the present embodiment, the relationship between the first short-side slit 221 of the Z2 and Z3 portions and the second short-side slit 222 of the Z1 and Z2 portions is also defined.
That is, as shown in fig. 2B, the sum of the width Wa1 of the first short-side slit portion 221 and the width Wa2 of the second short-side slit portion 222 at the portion (Z2 portion) of the first divided electrode 51 opposed to the second divided electrode 52 is equal to at least one of the width Wb1 of the first short-side slit portion 221 and the width Wb2 of the second short-side slit portion 222 at the portion (Z1 portion) of the first non-divided electrode 41 opposed to the second divided electrode 52 at the portion (Z3 portion) of the first divided electrode 51 opposed to the second non-divided electrode 42.
The relationship between the first short-side slit 221 of the Z2 and Z3 portions and the second short-side slit 222 of the Z1 and Z2 portions is expressed by the following expression (1) to (3).
(1)Wa1+Wa2＝Wb1
(2)Wa1+Wa2＝Wb2
(3)Wa1+Wa2＝Wb1＝Wb2。
In the present embodiment, the width Wb1 of the first short-side slit 221 in the Z3 portion is equal to the width Wb2 of the second short-side slit 222 in the Z1 portion. Therefore, in the present embodiment, the above formula (3) is particularly suitable. In addition, if the effect of the present embodiment is not impaired, the sum of Wa1 and Wa2 may not be exactly equal to Wb1, or may not be exactly equal to Wb 2.
When the above formula (1) is satisfied, the voltage applied to the unit capacitor 10 is less likely to become uneven in at least the Z2 and Z3 portions. The maximum decrease in the capacity of the unit capacitor 10 in the Z2 portion is a case where the first short-side slit portion 221 and the second short-side slit portion 222 are not opposed to each other (see the Xb portion surrounded by the one-dot chain line). In this case, the capacity of the unit capacitor 10 in the Z2 portion is reduced by an amount corresponding to the sum (wa1+wa2) of the widths of the first short-side direction slit portion 221 and the second short-side direction slit portion 222. However, the sum of the widths (wa1+wa2) of the first short-side slit portion 221 and the second short-side slit portion 222 in the Z2 portion is equal to the width (Wb 1) of the first short-side slit portion 221 in the Z3 portion. The portion corresponding to the width (Wb 1) does not originally form the unit capacitor 10 at the Z3 portion. Therefore, the voltage applied to the unit capacitor 10 in at least the Z2 and Z3 portions is difficult to become uneven.
By the same idea as described above, when the above expression of (2) is established, the voltage applied to the unit capacitor 10 is less likely to become uneven at least in the Z1 and Z2 portions. Further, when the above formula (3) is satisfied, the voltages applied to the unit capacitors 10 in the Z1 to Z3 portions are less likely to become uneven.
< Effect >
According to the present embodiment, the following operational effects are provided in addition to the same operational effects as those of the first embodiment.
That is, in the present embodiment, the width Wa1 of the first short-side slit 221 in the Z2 portion is smaller than the width Wb1 of the first short-side slit 221 in the Z3 portion (Wa 1 < Wb 1), and the width Wa2 of the second short-side slit 222 in the Z2 portion is smaller than the width Wb2 of the second short-side slit 222 in the Z1 portion (Wa 2 < Wb 2).
Therefore, even if the first short-side slit 221 and the second short-side slit 222 are not opposed to each other in the thickness direction T and are offset in the long-side direction L in the Z2 portion, the electrode area of the unit capacitor 10 in the Z2 portion does not significantly deviate from the electrode areas of the unit capacitors 10 in the Z1 and Z3 portions.
Therefore, according to the present embodiment, when a voltage is applied between the first end surface electrode 310 and the second end surface electrode 320 of the film capacitor 1, the voltage applied to the three unit capacitors 10 connected in series in the short-side direction S is less likely to become uneven. In other words, it is possible to suppress the voltage applied to a specific unit capacitor from becoming extremely large.
(3) Third embodiment
Next, a thin film capacitor 1 according to a third embodiment will be described with reference to the drawings. In the third embodiment, the same reference numerals as those in the first to second embodiments may be given to the same constituent elements as those in the first to second embodiments, and detailed description thereof may be omitted.
In the thin film capacitor 1 according to the third embodiment shown in fig. 3 and 4, there are a portion (Z1 portion) where the first non-divided electrode 41 faces the second divided electrode 52 through the dielectric thin film 2, a portion (Z2 portion) where the first divided electrode 51 faces the second divided electrode 52, and a portion (Z3 portion) where the first divided electrode 51 faces the second non-divided electrode 42, as in the thin film capacitor 1 according to the first embodiment.
First short-side slit part
The film capacitor 1 according to the present embodiment is different from the film capacitor 1 according to the first embodiment in that the number of slit portions 221 in the first short-side direction is different depending on the location. In the present embodiment, the problems described in the second embodiment are solved by changing the number of the first short-side direction slit portions 221 according to the location. This will be explained below.
Specifically, in the present embodiment, the number of first short-side slit portions 221 in the portion (Z2 portion) of the first divided electrode 51 opposed to the second divided electrode 52 is smaller than the number of first short-side slit portions 221 in the portion (Z3 portion) of the first divided electrode 51 opposed to the second non-divided electrode 42.
That is, in the first embodiment, all of the first short-side slit portions 221 are connected to the first edge portion 211 and the first end edge portion 241 (see fig. 1), but in the present embodiment, at least one or more of the first short-side slit portions 221 are connected to the first end edge portion 241 and are not connected to the first edge portion 211 (see a portion Y1 surrounded by a one-dot chain line in fig. 4).
In the present embodiment, the shape and the size of the plurality of first microelectrodes 511 included in the first microelectrode group 510 are different. Although not particularly limited, as shown in fig. 3, the first small electrode 511a has a rectangular shape longer in the longitudinal direction L than the first small electrode 511 b.
The first small electrode 511a is disposed at the Z2 portion. The first small electrode 511b is disposed at the Z3 portion. The first small electrode 511a is connected to the plurality of first small electrodes 511b through the first fuse 61.
As described above, the number of the first short-side slit portions 221 in the Z2 portion is smaller than the number of the first short-side slit portions 221 in the Z3 portion, and the area of the first electrode 31 in the Z2 portion is relatively increased. Thus, even when the first short-side slit 221 and the second short-side slit 222 do not face each other in the Z2 portion, a decrease in the capacity of the unit capacitor 10 in the Z2 portion can be suppressed.
Second short-side slit part
Further, the film capacitor 1 according to the present embodiment is different from the film capacitor 1 according to the first embodiment in that the number of slit portions 222 in the second short-side direction is different depending on the location. In the following, the same idea as that of the first short-side slit portion 221 described above is applied to the second short-side slit portion 222.
Specifically, in the present embodiment, the number of second short-side slit portions 222 in the portion (Z2 portion) of the first divided electrode 51 opposed to the second divided electrode 52 is smaller than the number of second short-side slit portions 222 in the portion (Z1 portion) of the first non-divided electrode 41 opposed to the second divided electrode 52.
That is, in the first embodiment, all of the second short-side slit portions 222 are connected to the second edge portion 212 and the second end edge portion 242 (see fig. 1), but in the present embodiment, at least one or more of the second short-side slit portions 222 are connected to the second end edge portion 242 and are not connected to the second edge portion 212 (see a portion Y2 surrounded by a one-dot chain line in fig. 4).
In the present embodiment, the shape and the size of the plurality of second microelectrodes 521 included in the second microelectrode group 520 are different. Although not particularly limited, as shown in fig. 3, the second small electrode 521a has a rectangular shape longer in the longitudinal direction L than the second small electrode 521 b.
The second small electrode 521a is disposed on the Z2 portion. The second small electrode 521b is disposed on the Z1 portion. The second small electrode 521a and the plurality of second small electrodes 521b are connected through the second fuse 62, respectively.
As described above, the number of the second short-side slit portions 222 in the Z2 portion is made smaller than the number of the second short-side slit portions 222 in the Z1 portion, and the area of the second electrode 32 in the Z2 portion is relatively increased. Thus, even when the first short-side slit 221 and the second short-side slit 222 do not face each other in the Z2 portion, a decrease in the capacity of the unit capacitor 10 in the Z2 portion can be suppressed.
< Effect >
According to the present embodiment, the following operational effects are provided in addition to the same operational effects as those of the first embodiment.
That is, in the present embodiment, the number of the first short-side slit portions 221 in the Z2 portion is smaller than the number of the first short-side slit portions 221 in the Z3 portion, and the number of the second short-side slit portions 222 in the Z2 portion is smaller than the number of the second short-side slit portions 222 in the Z1 portion.
Therefore, even if the first short-side slit 221 and the second short-side slit 222 are not opposed to each other in the thickness direction T and are offset in the long-side direction L in the Z2 portion, the electrode area of the unit capacitor 10 in the Z2 portion does not significantly deviate from the electrode areas of the unit capacitors 10 in the Z1 and Z3 portions.
Therefore, according to the present embodiment, when a voltage is applied between the first end surface electrode 310 and the second end surface electrode 320 of the film capacitor 1, the voltage applied to the three unit capacitors 10 connected in series in the short-side direction S is less likely to become uneven. In other words, it is possible to suppress the voltage applied to a specific unit capacitor from becoming extremely large.
(4) Fourth embodiment
Next, a thin film capacitor 1 according to a fourth embodiment will be described with reference to the drawings. In the fourth embodiment, the same reference numerals as those in the first to third embodiments may be given to the same constituent elements as those in the first to third embodiments, and detailed description thereof may be omitted.
The film capacitor 1 according to the present embodiment is common to the film capacitors 1 according to the first to third embodiments in that it includes three unit capacitors 10 connected in series in the short-side direction S, but is different from the film capacitors 1 according to the first to third embodiments in that it can include four or more unit capacitors 10 connected in series in the short-side direction S.
In other words, the film capacitor 1 according to the present embodiment expands or generalizes the number of unit capacitors 10 connected in series in the short-side direction S to three or more. Hereinafter, the number of unit capacitors 10 connected in series in the short-side direction S is set to n (where n+.3).
Fig. 5 and 6 show an example of the thin film capacitor 1 in the case where n=4. In the thin film capacitor 1, there are portions (Z1 and Z4 portions) where the first non-divided electrode 41 and the second divided electrode 52 face each other and portions (Z2 and Z3 portions) where the first divided electrode 51 and the second divided electrode 52 face each other with the dielectric thin film 2 interposed therebetween.
< dielectric film >
The dielectric thin film 2 of the present embodiment is the same as the dielectric thin films 2 of the first to third embodiments.
< first electrode >
[ case where n is an odd number of 3 or more ]
The first electrode 31 is separated into at least one or more first non-divided electrodes 41 and at least one or more first divided electrodes 51 by at least one or more first edge portions 211. In particular, the first electrode 31 is separated into (n+1)/2. Specifically, in the case where n=3, the first electrode 31 is separated into two (see fig. 1). For example, the first electrode 31 is separated into one first non-divided electrode 41 and one first divided electrode 51 by one first edge portion 211.
Further, the first electrode 31 is connected to the first end surface electrode 310, but is not connected to the second end surface electrode 320. Specifically, in the case where n=3, the first non-split electrode 41 disposed on one side (left side) of the short side direction S of the dielectric thin film 2 is connected to the first end surface electrode 310, but the first split electrode 51 disposed on the other side (right side) of the short side direction S of the dielectric thin film 2 is not connected to the second end surface electrode 320.
[ case where n is an even number of 4 or more ]
The first electrode 31 is separated into at least one or more first non-divided electrodes 41 and at least one or more first divided electrodes 51 by at least one or more first edge portions 211. In particular, the first electrode 31 is separated into (n+2)/2. Specifically, in the case where n=4, the first electrode 31 is separated into three (see fig. 5 and 6). For example, the first electrode 31 is separated into two first non-divided electrodes 41 and one first divided electrode 51 by the two first edge portions 211.
The first electrode 31 is connected to the first end surface electrode 310 and the second end surface electrode 320. Specifically, when n=4, the first non-split electrode 41 disposed on one side (left side) of the short side direction S of the dielectric thin film 2 is connected to the first end surface electrode 310, and the first non-split electrode 41 disposed on the other side (right side) of the short side direction S of the dielectric thin film 2 is connected to the second end surface electrode 320.
[ case where n is an integer of 3 or more ]
The first non-divided electrode 41 is preferably connected to the end surface electrode 30.
< second electrode >
[ case where n is an odd number of 3 or more ]
The second electrode 32 is separated by at least one or more second edge portions 212 in a state of including at least one or more second divided electrodes 52. In particular, the second electrode 32 is separated into (n+1)/2. Specifically, in the case where n=3, the second electrode 32 is separated into two (see fig. 1). For example, the second electrode 32 is separated into a second divided electrode 52 and a second non-divided electrode 42 by a second edge portion 212. Thus, in the case where the second electrode 32 includes only one second divided electrode 52, the second electrode 32 also includes at least one or more second non-divided electrodes 42.
Further, the second electrode 32 is not connected to the first end surface electrode 310, but is connected to the second end surface electrode 320. Specifically, in the case where n=3, the second divided electrode 52 disposed on one side (left side) of the short side direction S of the dielectric thin film 2 is not connected to the first end surface electrode 310, but the second non-divided electrode 42 disposed on the other side (right side) of the short side direction S of the dielectric thin film 2 is connected to the second end surface electrode 320.
[ case where n is an even number of 4 or more ]
The second electrode 32 is separated by at least one or more second edge portions 212 in a state of including at least one or more second divided electrodes 52. In particular the second electrode 32 is separated into n/2. Specifically, in the case where n=4, the second electrode 32 is separated into two (see fig. 5 and 6). For example, the second electrode 32 is separated into two second divided electrodes 52 by one second edge portion 212. In this way, when the second electrode 32 includes two or more second divided electrodes 52, the second electrode groups 520 are arranged in the short-side direction S (see fig. 6). On the other hand, in the case where the second electrode 32 includes only one second divided electrode 52, the second electrode 32 also includes at least one or more second non-divided electrodes 42.
Further, the second electrode 32 is not connected to the first end surface electrode 310 and the second end surface electrode 320. Specifically, in the case where n=4, the second split electrode 52 disposed on one side (left side) of the short side direction S of the dielectric thin film 2 is not connected to the first end surface electrode 310, and the second split electrode 52 disposed on the other side (right side) of the short side direction S of the dielectric thin film 2 is not connected to the second end surface electrode 320.
[ case where n is an integer of 3 or more ]
In the case where the second electrode 32 includes the second non-divided electrode 42, the second non-divided electrode 42 is preferably connected to the end surface electrode 30.
< Effect >
According to the present embodiment, even when the thin film capacitor 1 is used at a high voltage, the function as a whole can be maintained.
That is, the film capacitor 1 according to the present embodiment includes three or more unit capacitors 10 (see a in fig. 5 and 9) connected in series in the short side direction S of the dielectric film 2. Therefore, when the voltage applied between the first end surface electrode 310 and the second end surface electrode 320 of the thin film capacitor 1 shown in a of fig. 7 and a of fig. 8 is the same as the voltage applied between the first end surface electrode 310 and the second end surface electrode 320 of the thin film capacitor 1 according to the present embodiment, the voltage applied to the unit capacitor 10 of the thin film capacitor 1 according to the present embodiment is smaller than the voltage applied to the unit capacitor 10 of the thin film capacitor 1 shown in a of fig. 7 and a of fig. 8, and thus damage to the dielectric thin film 2 is more easily suppressed.
Further, in the film capacitor 1 according to the present embodiment, the plurality of first small electrodes 511 are connected by the first fuse 61, and the plurality of second small electrodes 521 are connected by the second fuse 62 (see fig. 1 and 6). Therefore, even if a part between the first electrode 31 and the second electrode 32 is short-circuited, at least one of the first fuse 61 and the second fuse 62 is cut.
Therefore, according to the present embodiment, even when the thin film capacitor 1 is used at a high voltage, the function as a whole can be maintained.
Description of the reference numerals-
1. Thin film capacitor
10. Unit capacitor
2. Dielectric film
201. First surface
202. A second surface
211. A first edge part
212. Second edge portion
221. A first short-side slit part
222. A second short-side slit part
31. First electrode
32. Second electrode
41. First non-divided electrode
42. Second non-divided electrode
51. First divided electrode
510. First small electrode group
511. First small electrode
52. Second divided electrode
520. Second small electrode group
521. Second small electrode
61. First fuse
62. Second fuse
S short side direction
L long side direction
Wa1 width
Wb1 width
Wa2 width
Wb2 width.
Claims (8)
1. A thin film capacitor is provided with:
a dielectric thin film having a first surface and a second surface opposite to the first surface, the dielectric thin film extending in a long-side direction orthogonal to a short-side direction;
a first electrode disposed on the first surface; and
a second electrode disposed on the second surface,
comprises three unit capacitors connected in series in the short side direction by the first electrode and the second electrode facing each other through the dielectric film,
The first electrode is separated into a first non-divided electrode and a first divided electrode extending in the longitudinal direction by a first edge portion extending in the longitudinal direction,
the first divided electrode is divided into a plurality of first small electrode groups arranged in the longitudinal direction by a first short-side direction slit portion extending in the short-side direction,
the plurality of first microelectrode groups each include a plurality of first microelectrodes connected by first fuses,
the second electrode is separated into a second non-divided electrode and a second divided electrode extending in the longitudinal direction by a second edge portion extending in the longitudinal direction,
the second dividing electrode is divided into a plurality of second small electrode groups arranged in the longitudinal direction by a second short-side direction slit portion extending in the short-side direction,
the plurality of second microelectrode groups each include a plurality of second microelectrodes connected by a second fuse.
2. The thin film capacitor as claimed in claim 1, wherein,
there are a portion where the first non-divided electrode and the second divided electrode face each other with the dielectric thin film interposed therebetween, a portion where the first divided electrode and the second divided electrode face each other, and a portion where the first divided electrode and the second non-divided electrode face each other,
The width of the first short-side slit portion of the portion where the first divided electrode and the second divided electrode face each other is smaller than the width of the first short-side slit portion of the portion where the first divided electrode and the second non-divided electrode face each other.
3. The thin film capacitor as claimed in claim 2, wherein,
the width of the second short-side slit portion of the portion where the first divided electrode and the second divided electrode face each other is smaller than the width of the second short-side slit portion of the portion where the first non-divided electrode and the second divided electrode face each other.
4. The thin film capacitor as claimed in any one of claims 1 to 3, wherein,
there are a portion where the first non-divided electrode and the second divided electrode face each other with the dielectric thin film interposed therebetween, a portion where the first divided electrode and the second divided electrode face each other, and a portion where the first divided electrode and the second non-divided electrode face each other,
the sum of the width of the first short-side slit portion and the width of the second short-side slit portion of the first divided electrode opposed to the second divided electrode is equal to at least one of the width of the first short-side slit portion of the first divided electrode opposed to the second non-divided electrode and the width of the second short-side slit portion of the first non-divided electrode opposed to the second divided electrode.
5. The thin film capacitor as claimed in any one of claims 1 to 4, wherein,
there are a portion where the first non-divided electrode and the second divided electrode face each other with the dielectric thin film interposed therebetween, a portion where the first divided electrode and the second divided electrode face each other, and a portion where the first divided electrode and the second non-divided electrode face each other,
the number of the first short-side slit portions of the portion where the first divided electrode and the second divided electrode face each other is smaller than the number of the first short-side slit portions of the portion where the first divided electrode and the second non-divided electrode face each other.
6. The thin film capacitor as claimed in claim 5, wherein,
the number of the second short-side slit portions of the portion where the first divided electrode and the second divided electrode are opposed is smaller than the number of the second short-side slit portions of the portion where the first non-divided electrode and the second divided electrode are opposed.
7. A thin film capacitor is provided with:
a dielectric thin film having a first surface and a second surface opposite to the first surface, the dielectric thin film extending in a long-side direction orthogonal to a short-side direction;
A first electrode disposed on the first surface; and
a second electrode disposed on the second surface,
comprises three or more odd-numbered unit capacitors connected in series in the short side direction by the first electrode and the second electrode facing each other through the dielectric film,
the first electrode is separated into at least one first non-divided electrode and at least one first divided electrode extending in the longitudinal direction by at least one first edge portion extending in the longitudinal direction,
the first divided electrode is divided into a plurality of first small electrode groups arranged in the longitudinal direction by a first short-side direction slit portion extending in the short-side direction,
the plurality of first microelectrode groups each include a plurality of first microelectrodes connected by first fuses,
the second electrode is separated by at least one or more second edge portions extending in the longitudinal direction in a state of including at least one or more second divided electrodes,
the second dividing electrode is divided into a plurality of second small electrode groups arranged in the longitudinal direction by a second short-side direction slit portion extending in the short-side direction,
The plurality of second microelectrode groups each include a plurality of second microelectrodes connected by a second fuse.
8. A thin film capacitor is provided with:
a dielectric thin film having a first surface and a second surface opposite to the first surface, the dielectric thin film extending in a long-side direction orthogonal to a short-side direction;
a first electrode disposed on the first surface; and
a second electrode disposed on the second surface,
comprises four or more even number of unit capacitors connected in series in the short side direction by the first electrode and the second electrode facing each other through the dielectric film,
the first electrode is separated into at least one first non-divided electrode and at least one first divided electrode extending in the longitudinal direction by at least one first edge portion extending in the longitudinal direction,
the first divided electrode is divided into a plurality of first small electrode groups arranged in the longitudinal direction by a first short-side direction slit portion extending in the short-side direction,
the plurality of first microelectrode groups each include a plurality of first microelectrodes connected by first fuses,
the second electrode is separated by at least one or more second edge portions extending in the longitudinal direction in a state of including at least one or more second divided electrodes,
The second dividing electrode is divided into a plurality of second small electrode groups arranged in the longitudinal direction by a second short-side direction slit portion extending in the short-side direction,
the plurality of second microelectrode groups each include a plurality of second microelectrodes connected by a second fuse.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2021098311 | 2021-06-11 | ||
| JP2021-098311 | 2021-06-11 | ||
| PCT/JP2022/022000 WO2022259899A1 (en) | 2021-06-11 | 2022-05-30 | Film capacitor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117461104A true CN117461104A (en) | 2024-01-26 |
Family
ID=84424912
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202280040136.8A Pending CN117461104A (en) | 2021-06-11 | 2022-05-30 | Thin film capacitor |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPWO2022259899A1 (en) |
| CN (1) | CN117461104A (en) |
| WO (1) | WO2022259899A1 (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0272609A (en) * | 1988-09-07 | 1990-03-12 | Marcon Electron Co Ltd | Sh capacitor |
| JPH04250608A (en) * | 1991-01-25 | 1992-09-07 | Nichicon Corp | Energy storage quick discharge capacitor |
| JPH06168844A (en) * | 1992-04-06 | 1994-06-14 | Nichicon Corp | High-pressure capacitor for power |
| JP2798611B2 (en) * | 1994-08-29 | 1998-09-17 | ニチコン株式会社 | High voltage capacitors for power |
-
2022
- 2022-05-30 WO PCT/JP2022/022000 patent/WO2022259899A1/en active Application Filing
- 2022-05-30 CN CN202280040136.8A patent/CN117461104A/en active Pending
- 2022-05-30 JP JP2023527621A patent/JPWO2022259899A1/ja active Pending
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| JPWO2022259899A1 (en) | 2022-12-15 |
| WO2022259899A1 (en) | 2022-12-15 |
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